CN214271736U - T-shaped rigid frame bridge reinforcing structure - Google Patents
T-shaped rigid frame bridge reinforcing structure Download PDFInfo
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- CN214271736U CN214271736U CN202022517524.1U CN202022517524U CN214271736U CN 214271736 U CN214271736 U CN 214271736U CN 202022517524 U CN202022517524 U CN 202022517524U CN 214271736 U CN214271736 U CN 214271736U
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Abstract
A T-shaped rigid frame bridge reinforcing structure is characterized in that an inclined partition plate with a chamfer angle c and a chamfer angle b at the top is additionally arranged between a lower chamfer angle of a main beam of a T-shaped frame and a top plate; longitudinal beams distributed at intervals are arranged on the bottom surface of the top plate between the chamfer angle c and the top of the middle clapboard; the prestressed reinforcement penetrates through the pore passages arranged in the top parts of the middle partition plate, the longitudinal beam and the inclined partition plate and is anchored on the chamfer angle b. The utility model discloses can reduce the moment of flexure that T constructed the girder, improve the security that T constructed the girder, prevent that T from constructing that the girder beam-ends is downwarped greatly and main mound position department T constructs the girder top and because of the not enough crack that appears of bending resistance bearing capacity.
Description
Technical Field
The utility model relates to a bridge engineering technical field, especially a T shape rigid frame bridge reinforced structure.
Background
The T-shaped rigid frame bridge is a type of rigid frame bridge, and after a plurality of T-shaped rigid frame bridges are put into use, as the T-shaped rigid frame bridges are additionally provided with auxiliary facilities (flower troughs, municipal pipelines, additionally paved bridge deck asphalt layers and the like), a T-shaped main beam often has some typical diseases due to insufficient bending resistance, and the T-shaped rigid frame bridge is mainly characterized in that: (1) under the action of constant load of the hanging beam and automobile load, the downward deflection of the beam end of the T-shaped main beam is too large along with the development of shrinkage and creep of the T-shaped main beam; (2) cracks are often generated at the tops of the T-shaped main beams at the positions of the main piers due to insufficient bending resistance and bearing capacity.
In order to solve the typical problem of the T-frame main beam, the patent document CN202148495U discloses an external prestress reinforced T-shaped rigid frame bridge bracket anchoring structure, wherein the T-shaped rigid frame bridge is reinforced by external prestress, and a transverse partition wall is arranged in a box beam. The method has the disadvantages that the external prestress is required to be arranged on the whole T-shaped main beam, and the external prestress is excessively used; the transverse partition walls arranged in the box girder only play a role in supporting the external prestress or turning the external prestress.
The CN107100095A patent document discloses a reinforcing method for increasing the bending resistance of a T-structure main beam by adding a main tower and a stay cable and using the stay cable to bear part of the load. The reinforcing method needs to add a main tower and a stay cable, and has large engineering quantity and high manufacturing cost; and the construction technology of the stay cable has high requirements.
SUMMERY OF THE UTILITY MODEL
Problem to above-mentioned prior art exists, the utility model provides an economy, construction are swift, can reduce T shape rigid frame bridge reinforced structure of T structure girder moment of bending of T shape rigid frame bridge owner mound position department by a wide margin.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a T-shaped rigid frame bridge reinforcing structure is characterized in that inclined partition plates are respectively arranged between a chamfer angle a at the lower part of a main beam of a T-shaped frame and a top plate; the inner side of the joint of the top of the inclined partition plate and the top plate is provided with a chamfer angle c, and the outer side is provided with a chamfer angle b; a group of longitudinal beams are distributed at intervals on the bottom surface of the top plate between the chamfer c of the inclined clapboard and the top of the middle clapboard; and through holes are formed in the top parts of the middle partition plate, the longitudinal beam and the inclined partition plate, and the prestressed steel bars penetrate through the holes and are anchored on the chamfer angle b at two ends respectively.
The inclined partition board forms an included angle theta of 45 degrees with the horizontal plane.
The thickness b of the inclined partition plate is more than or equal to 50cm and less than or equal to 100 cm.
The chamfer c is in the form of a secondary chamfer.
The longitudinal beams are 60 cm-100 cm in height and are arranged at a mutual distance of 200 cm-500 cm.
The construction method of the reinforced structure comprises the following steps:
firstly, carrying out feasibility analysis on the T-shaped rigid frame bridge by adopting the reinforced structure:
obtaining the constant load bending moment M added by the T-shaped rigid frame bridge and added auxiliary facilities (flower grooves, municipal pipelines, additionally paved bridge deck asphalt layers and the like) at the main pier position through professional bridge finite element software or manual calculationinc；
And then calculating the reduction value of the bending moment of the T-shaped main beam at the position of the main pier after the T-shaped rigid frame bridge is additionally provided with the reinforcing structure according to the following formula:
MX＝R×(a+h)+η×n×[10.5×(L–a–h)2/2+350×(L–a–h)]
in the formula:
a: the horizontal distance (m) between the bottom end of the central line of the inclined partition plate and the central line of the main pier;
h: the T at the position of the main pier forms the beam height (m) of the main beam;
r: taking the large value (kN) of the counter force of the middle hanging beam and the side hanging beam which are constantly loaded on the T-structure main beam;
n: the number of lanes;
eta: the lane reduction coefficient can be inquired through the standard 'design standard of reinforced concrete and prestressed concrete bridges and culverts';
l: the cantilever length (m) of the T-shaped main beam;
if M isX≥MincThe above-described reinforcing structure may be employed;
after the reinforced structure is determined to be adopted, construction is carried out according to the following steps:
step 1, pre-treatment before reinforcement is carried out on a T-shaped main girder of the T-shaped rigid frame bridge at a main pier position:
drilling a hole at the top of the middle partition plate; respectively performing chiseling treatment on the surface of the chamfer angle a and the bottom surface of the intersection of the top plate and the top of the inclined partition plate, and planting ribs at the chiseling positions;
3, penetrating a plastic corrugated pipe in each drilled hole at the top of the middle partition plate, and placing the part of the plastic corrugated pipe extending out of the drilled hole below the top plate; binding the reinforcing steel bars of the inclined partition plate, the chamfer angle b, the chamfer angle c and the longitudinal beam, horizontally placing the plastic corrugated pipe into the reinforcing steel bars of the inclined partition plate, the chamfer angle b, the chamfer angle c and the longitudinal beam to form a pore channel during binding, and then pouring concrete; penetrating the prestressed reinforcement through the plastic corrugated pipe, and then tensioning and anchoring the prestressed reinforcement on the chamfer angle b to form a T-shaped main beam reinforcing structure;
and 4, lowering the middle hanging beam and the side hanging beam, recovering the expansion joints among the T-shaped main beam, the middle hanging beam and the side hanging beam, and finishing construction.
And 2, hoisting the middle hanging beam and the side hanging beam in the step 2, wherein a hot air balloon hoisting mode can be respectively adopted.
The utility model discloses a set up the oblique baffle in T constructs the girder, can reduce T and construct the cantilever length of girder, and then reduce T and construct the moment of flexure of girder, the principle that its moment of flexure reduces explains in combination with fig. 4(a), fig. 4(b) and fig. 4 (c): firstly, as shown in fig. 4(a), when the cantilever length of the T-structure main beam is L, the maximum bending moment generated by the cantilever end acting force F on the T-structure main beam is F × L, and the maximum bending moment is generated at the main pier position of the T-structure main beam; secondly, as shown in fig. 4(b), after the inclined partition plate is additionally arranged on the T-shaped main beam, the maximum bending moment generated by the cantilever end acting force F on the T-shaped main beam is F multiplied by L1, and the maximum bending moment is generated at the position of the inclined partition plate of the T-shaped main beam; ③ as shown in fig. 4(b), the maximum bending moment of the T-frame main beam can be reduced to Δ M ═ F × (L-L1) by adding the oblique partitioning plate.
According to mechanics principle, T shape rigid frame bridge increases the utility model discloses T constructs girder behind reinforced structure and locates the reduction value M of moment of flexure at the main mound positionXThe calculation formula is the above
MX＝R×(a+h)+η×n×[10.5×(L–a–h)2/2+350×(L–a–h)]，
In a calculation formula, R (a + h) is the bending moment of the constant load of the middle hanging beam and the side hanging beam to the T-shaped main beam; eta.Xn.times.10.5 (L-a-h)2The bending moment of the reduced uniform load force of the automobile to the T-shaped main beam is/2;eta × n × 350 × (L-a-h) is the bending moment of the reduced vehicle load concentration force on the T-beam.
The utility model has the advantages that:
1. the utility model discloses a set up the inclined baffle in T constructs the girder, can reduce T and construct the cantilever length of girder, and then reduce T and construct the moment of flexure of girder. The reduction of the bending moment of the T-shaped main beam can effectively improve the safety of the T-shaped main beam, and can effectively prevent the defects that the beam end of the T-shaped main beam is greatly bent downwards and the top of the T-shaped main beam at the position of a main pier often cracks and the like due to insufficient bending resistance bearing capacity.
2. A stable and reliable triangular T-shaped rigid frame bridge reinforcing structure is formed by the inclined partition plate and the top plate; meanwhile, the top of the inclined partition plate is provided with a chamfer, particularly, the chamfer c adopts a secondary chamfer form, so that the stress concentration at the intersection of the inclined partition plate and the top plate can be effectively prevented; rigidity and compressive stress reserve through setting up roof between longeron and the oblique baffle of prestressing steel reinforcing can effectively prevent that roof tensile strength is not enough when oblique baffle top receives the automobile load effect.
3. The middle hanging beam and the side hanging beam are respectively hoisted, so that the bending moment generated by the constant load of the middle hanging beam and the side hanging beam at the T-shaped main girder at the position of the main pier can be unloaded, and the constructed T-shaped rigid frame bridge reinforcing structure can unload the load generated by the constant load of the middle hanging beam and the side hanging beam at the position of the main pier at the T-shaped main girder.
4. The hot air balloon is adopted to lift the middle hanging beam and the side hanging beam, the construction is simple and convenient, the middle hanging beam and the side hanging beam can be quickly lifted to the positions above the middle hanging beam and the side hanging beam on site, and the load unloading of the T-structure main beam of the middle hanging beam and the side hanging beam, which is constantly loaded at the position of the main pier, is completed. After the T-shaped rigid frame bridge reinforcing structure is constructed, the middle hanging beam and the side hanging beam are reset simply and can be put down directly. If the traditional crane is adopted for hoisting, the crane needs to be installed, the middle hanging beam and the side hanging beam need to be vertically hoisted, the horizontal translation is carried out, the middle hanging beam and the side hanging beam need to be lowered to the barge on the ground or on the water surface, and the like, so that the unloading is realized; after the T-shaped rigid frame bridge reinforcing structure is constructed, the middle hanging beam and the side hanging beam can be reset only by lifting, transversely moving and lowering, the construction process is complicated, and the construction period is long.
Drawings
FIG. 1 is an elevation view of a T-shaped rigid frame bridge;
FIG. 2 is an elevation view of a T-shaped rigid frame bridge reinforcing structure at a main pier position of the T-shaped rigid frame bridge;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
fig. 4(a), 4(b) and 4(c) are schematic diagrams illustrating the principle of reducing bending moment of the T-shaped rigid frame bridge reinforcing structure.
In the figure: the method comprises the following steps of 1-T-shaped rigid frame bridge, 2-T-shaped main beam, 3-main pier, 4-middle hanging beam, 5-side hanging beam, 6-inclined partition plate, 7-middle partition plate, 8-bottom plate, 9-chamfer angle a, 10-top plate, 11-chamfer angle b, 12-chamfer angle c, 13-longitudinal beam, 14-pore channel, 15-prestressed reinforcement and 16-hot air balloon.
Detailed Description
The following description will explain the present invention by referring to the embodiments.
Referring to fig. 1, the T-shaped rigid frame bridge 1 of the present embodiment has a bridge span combination of (100+160+100) m. The cantilever length L of the T-shaped main beam 2 is 60 m; the beam height h of the T-shaped main beam 2 at the position of the main pier 3 is 10 m; the large value R of the counterforce of the middle hanging beam 4 and the side hanging beam 5 which are constantly loaded on the T-shaped main beam 2 is 6250 kN; the number n of lanes is 3, and the lane reduction coefficient eta is 0.78 by checking the design specification of reinforced concrete and prestressed concrete bridges and culverts (JTG 3362 and 2018).
This T shape rigid frame bridge has increased flower groove and municipal pipeline auxiliary facilities, for the bending resistance who avoids the T to construct the girder not enough to lead to T shape rigid frame bridge to put into use after take place T to construct girder beam-ends and down warp too big and main mound position department T and construct the girder top and produce the crack, plan the adoption the utility model discloses reinforced structure consolidates.
By the calculation of professional bridge finite element software, the constant load bending moment M added by the flower trough additionally arranged on the T-shaped rigid frame bridge and the T-shaped main beam of the municipal pipeline at the position of the main pier can be obtainedinc＝98000kNm；
If adopt the utility model discloses T shape rigid frame bridge reinforced structure, the moment of flexure reduction value of T structure girder 2 in 3 positions departments of main mound
MX＝R×(a+h)+η×n×[10.5×(L–a–h)2/2+350×(L–a–h)]
＝6250×(1.0+10.0)+0.78×3×[10.5×(60–1.0–10.0)2/2+350×(60–1.0–10.0)]
＝138377kNm
Satisfies MX≥MincConfirm this T shape rigid frame bridge and adopt the utility model discloses reinforced structure consolidates.
With reference to fig. 1, 2 and 3, the reinforcing structure of the T-shaped rigid frame bridge is designed to: inclined partition plates 6 are respectively arranged between the chamfers a9 at the lower parts of the T-shaped main beams and the top plate 10, and the horizontal distance a between the bottom ends of the central lines of the inclined partition plates 6 and the central line of the main pier 3 is 1.0 m; the inclined partition plate 6 forms an angle θ of 45 ° with the horizontal, and the thickness b of the inclined partition plate 6 is 70 cm. The inclined partition plate 6 is provided with a chamfer c12 at the inner side of the joint of the top and the top plate 10, a chamfer b11 at the outer side, and a chamfer c12 in a secondary chamfer form. Five longitudinal beams 13 which are spaced at a distance of 350cm are arranged on the bottom surface of the top plate between the chamfer c of the inclined clapboard 6 and the top of the middle clapboard 7, and the height of each longitudinal beam is 80 cm. A through hole 14 is opened in the top of the middle clapboard 7, the longitudinal beam 13 and the oblique clapboard 6, a plastic corrugated pipe (not shown) is inserted in the hole, and a prestressed reinforcement 15 is inserted through the plastic corrugated pipe, and the two ends of the prestressed reinforcement are respectively anchored on the chamfers b 11.
The construction method of the T-shaped rigid frame bridge reinforcing structure is carried out according to the following steps:
step 1, pre-treatment before reinforcement is carried out on a T-shaped main girder of the T-shaped rigid frame bridge at a main pier position:
drilling holes in the longitudinal beam correspondingly designed at the top of the middle clapboard; respectively performing chiseling treatment on the surface of the chamfer angle a and the bottom surface of the joint of the top plate and the top of the inclined partition plate, and planting ribs at the chiseling positions;
3, respectively penetrating plastic corrugated pipes into five drill holes formed in the top of the middle partition plate, and placing the parts of the plastic corrugated pipes extending out of the drill holes below the top plate; binding the inclined partition plates, the chamfer angle b, the chamfer angle c and the longitudinal beam steel bars, horizontally placing five plastic corrugated pipes into the inclined partition plates, the chamfer angle b, the chamfer angle c and the longitudinal beam steel bars respectively to form a pore channel during binding, and then pouring concrete; penetrating the prestressed reinforcement through the pore channel, and then tensioning and anchoring the prestressed reinforcement on the chamfer angle b to form a T-shaped main beam reinforcing structure;
and 4, lowering the middle hanging beam and the side hanging beam, recovering the expansion joints among the T-shaped main beam, the middle hanging beam 4 and the side hanging beam 5, and finishing construction.
Claims (5)
1. The utility model provides a T shape rigid frame bridge reinforced structure which characterized in that: inclined partition plates (6) are respectively arranged between the chamfers a (9) and the top plate (10) at the lower part of the T-shaped main beam; the inner side of the joint of the top of the inclined clapboard and the top plate is provided with a chamfer angle c (12), and the outer side is provided with a chamfer angle b (11); a group of longitudinal beams (13) are distributed at intervals on the bottom surface of the top plate between the chamfer c of the inclined clapboard and the top of the middle clapboard (7); and the top parts of the middle clapboard, the longitudinal beam and the inclined clapboard are provided with through holes (14), and the prestressed reinforcement (15) penetrates through the holes and two ends of the prestressed reinforcement are respectively anchored on the chamfer angle b.
2. The T-shaped rigid frame bridge reinforcement structure of claim 1, wherein: the inclined partition plate (6) forms an included angle theta of 45 degrees with the horizontal plane.
3. The T-shaped rigid frame bridge reinforcement structure of claim 1, wherein: the thickness b of the inclined partition board (6) is more than or equal to 50cm and less than or equal to 100 cm.
4. The T-shaped rigid frame bridge reinforcement structure of claim 1, wherein: the chamfer c (12) takes the form of a secondary chamfer.
5. The T-shaped rigid frame bridge reinforcement structure of claim 1, wherein: the longitudinal beams (13) are 60-100 cm in height and are arranged at a distance of 200-500 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517524.1U CN214271736U (en) | 2020-11-04 | 2020-11-04 | T-shaped rigid frame bridge reinforcing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517524.1U CN214271736U (en) | 2020-11-04 | 2020-11-04 | T-shaped rigid frame bridge reinforcing structure |
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| CN214271736U true CN214271736U (en) | 2021-09-24 |
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| CN202022517524.1U Active CN214271736U (en) | 2020-11-04 | 2020-11-04 | T-shaped rigid frame bridge reinforcing structure |
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