Rapid reinforcing and maintaining structure for small hinge joint of plate girder

Abstract

The utility model relates to a rapid reinforcing and maintaining structure for a small hinge joint of a plate girder, which is characterized in that web L-shaped steel bars are planted in a girder web on two sides of the hinge joint to be reinforced and maintained and in an old concrete pavement layer, a new concrete pavement layer and a new asphalt pavement layer are poured on the old concrete pavement layer, and the new concrete pavement layer adopts rapid-hardening ultra-high performance concrete; the compressive strength within 2 hours is greater than or equal to 30Mpa, and the axial tensile strength within 3 days is greater than or equal to 5Mpa; sMA-13 fine-grained asphalt concrete is adopted for the new asphalt pavement layer; the thickness of the new concrete pavement layer is 5-6 cm; and the thickness of the new asphalt pavement layer is 3-4cm. According to the structure, after the quick-hardening ultra-high-performance concrete is directly poured on the existing bridge deck concrete pavement, the asphalt surface layer is paved, so that the original pavement chiseling time and the construction operation time are saved; and meanwhile, web L-shaped steel bars are planted at the bridge deck pavement positions at the hinge joints, so that the interlayer shear resistance of new and old bridge deck pavement is improved, and the new and old bridge deck pavement and the old bridge deck pavement are stressed together.

Description

Technical Field

[0001] The utility model relates to a fast repair technology for a small hinged joint of a plate beam, in particular to a fast reinforcement and repair structure for a small hinged joint of a plate beam. Background Art

[0002] At present, there are three main conventional repair processes for small hinge joint damage in slabs and beams, namely, under-slab grouting, paving concrete repair, and inter-slab reinforcement.

[0003] Under-slab grouting is to inject grouting glue into the hinge joint from the bottom of the beam, so as to repair the cracks and loose concrete defects in the hinge joint and strengthen the lateral connection of the beam body. However, experiments have shown that for old hollow slab beams, the concrete at the corners of the slab beams is often loose due to water erosion, and strip peeling is prone to occur during the grouting process, and it is impossible to form a force-bearing whole; for slab beams with slightly larger spans or higher degree of hinge joint damage, due to the large disturbance of the beam body under heavy load, this process still requires traffic to be enclosed, and the advantages of non-sealed operations cannot be brought into play. And when the bridge deck pavement corresponding to the hinge joint is damaged, it is necessary to reclose the bridge deck traffic and dig up and repair the pavement concrete, which brings repeated work. Therefore, this process is more suitable for the early damage of the hinge joint, that is, the bridge deck pavement at the hinge joint has not yet shown obvious fragmentation.

[0004] Pavement concrete repair refers to a type of construction method that involves chiseling off the concrete pavement on the bridge deck, re-arranging the steel mesh and pouring concrete. This method can restore the original design structure to the maximum extent, so in theory the reinforcement and repair effect is better. However, repair is different from new construction, and its operation time and working environment are subject to more restrictions. Generally speaking, its repair operation time is only 6-8 hours, and paving concrete can only use fast concrete, which is not only costly but also has poor durability. Under the interference of unsealed traffic loads, the quality of concrete pouring construction is even more difficult to guarantee, so the repair effect is often unsatisfactory.

[0005] Inter-slab reinforcement refers to measures such as implanting steel bars and adding tie rods between slab beams without large-scale renovation of the bridge deck. Since there is no need to pour concrete, the repair time is relatively short, but only using steel structures to reinforce the horizontal connection between beams has legacy issues in terms of reliability and durability, so it is generally used for temporary reinforcement and maintenance.

[0006] Based on this, a new type of fast reinforcement and repair structure for small hinged joints of slab beams needs to be proposed. This structure directly pours fast-hardening ultra-high performance concrete on the existing bridge deck concrete pavement, and then spreads the asphalt surface layer, saving the time of chiseling the original pavement and construction work time; at the same time, the structure plants L-shaped web steel bars on the bridge deck pavement position at the hinged joint. By welding the steel bars, the interlayer shear performance of the new and old bridge deck pavements is improved, which is conducive to the joint force of the two. Thus, the high-efficiency and high-quality repair of the hinged joint pavement is achieved. Summary of the invention

[0007] In order to solve the problems of the existing technology that only treats the symptoms but not the root cause, frequent diseases, and many repairs, the utility model provides a fast reinforcement and repair structure for small hinged joints of slab beams. The structure directly pours fast-hardening ultra-high performance concrete on the existing bridge deck concrete pavement, and then spreads the asphalt surface layer, saving the time of chiseling the original pavement and construction work time; at the same time, the structure plants the web L-shaped steel bars on the bridge deck pavement position at the hinged joint, and by welding the steel bars, the interlayer shear resistance of the new and old bridge deck pavements is improved, which is conducive to the joint force of the two. Thereby achieving the purpose of high-efficiency and high-quality repair of hinged joint pavement, which is conducive to the safe operation of the bridge structure.

[0008] To achieve the above-mentioned purpose, the technical solution of the utility model is: a rapid reinforcement and repair structure for small hinged joints of slabs and beams, comprising an old concrete paving layer, a new concrete paving layer, a new asphalt paving layer, and web L-shaped steel bars, the web L-shaped steel bars are planted in the beam web and the old concrete paving layer on both sides of the hinged joint to be reinforced and repaired, a new concrete paving layer and a new asphalt paving layer are poured on the old concrete paving layer, the new concrete paving layer adopts fast-hardening ultra-high performance concrete, whose compressive strength within 2 hours is ≥30Mpa, and 3d axial tensile strength is ≥5Mpa; the new asphalt paving layer adopts SMA-13 ​​fine-grained asphalt concrete; the thickness of the new concrete paving layer is 5 to 6cm; the thickness of the new asphalt paving layer is 3 to 4cm.

[0009] Furthermore, a layer of steel mesh is laid in the new concrete pavement.

[0010] Furthermore, the steel mesh arranged in the new concrete pavement layer is an 8mm steel mesh with a mesh size of 200x200mm, and the thickness of the concrete protective layer of the steel mesh is not less than 2cm.

[0011] Furthermore, the width of the new concrete pavement layer exceeds the outermost hinged joint to be repaired by 50 cm, and the corresponding width of the new asphalt pavement layer exceeds the new concrete pavement layer by 10 cm; a 15 cm wide anti-cracking tape is laid on the new concrete pavement layer.

[0012] Furthermore, the web L-shaped steel bars are made of grade 3 steel bars with a diameter of 12mm and a planting depth of not less than 20cm, of which the depth into the web of the beam is not less than 12cm. The web L-shaped steel bars are spaced 40cm apart and welded into a whole on both sides with a single-sided welded lap length of not less than 12cm.

[0013] Due to the adoption of the above technology, the utility model has the following beneficial effects:

[0014] 1. The hinge joint disease is greatly reduced, which is conducive to the normal passage of highway bridges.

[0015] 2. The maintenance frequency is greatly reduced, which is more economical in the long run.

[0016] 3. Smooth roads and harmonious people, reducing social complaints and conflicts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall elevation layout of the plate-beam small hinged joint quick repair structure of the utility model;

[0018] Figure 2 This is the overall plan layout of the plate-beam small hinged joint quick repair structure of the utility model;

[0019] Figure 3 It is the steel bar elevation structural drawing;

[0020] Figure 4 It is the plan view of the steel bar structure;

[0021] In the figure: A is the edge line of the new concrete pavement, and B is the edge line of the new asphalt pavement. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, the utility model is a structure for rapid reinforcement and repair of small hinged joints in a slab beam, which is composed of an old concrete pavement layer 3, a new concrete pavement layer 4, and a new asphalt pavement layer 5. L-shaped web steel bars 2 are planted in the web of the beam and the old concrete pavement layer 3 on both sides of the hinged joint 1 to be reinforced and repaired, and the new concrete pavement layer 4 and the new asphalt pavement layer 5 are poured on the old concrete pavement layer 2. A layer of 8mm steel mesh 7 with a mesh size of 200x200mm is arranged in the new concrete pavement layer 4, and the concrete protective layer thickness of the steel mesh 7 is not less than 2cm.

[0024] The new concrete pavement layer 4 uses fast-hardening ultra-high performance concrete, whose compressive strength within 2 hours is ≥30Mpa and 3d axial tensile strength is ≥5Mpa. The new asphalt pavement layer 5 uses SMA-13 ​​fine-grained asphalt concrete. The thickness of the new concrete pavement layer 4 is (5-6) cm; the thickness of the new asphalt pavement layer 5 is (3-4) cm.

[0025] like Figure 2 As shown in the figure, the width of the new concrete pavement layer 4 in the slab-beam small hinged joint rapid reinforcement and repair structure should exceed the outermost hinged joint to be repaired by 50cm, and the corresponding new asphalt pavement layer 5 should exceed the new concrete pavement layer by 10cm. A 15cm wide anti-cracking sticker should be laid on the new concrete pavement layer 4.

[0026] like Figure 3As shown in Figure 4, the web L-shaped steel bar 2 is a grade 3 steel bar with a diameter of 12 mm and a planting depth of not less than 20 cm, of which the depth of the steel bar into the web of the beam is not less than 12 cm. The web L-shaped steel bar 2 is spaced 40 cm apart and welded on both sides to form a whole, with a single-sided welded lap length of not less than 12 cm.

[0027] The utility model discloses a quick repair method for small hinged joints of plate beams, which adopts a quick reinforcement and repair structure of small hinged joints of plate beams. The repair process flow is as follows: 1. chiseling off the old asphalt pavement layer, 2. chiseling off the loose old concrete pavement layer, 3. planting and welding the web L-shaped steel bars, 4. laying the paving steel mesh, 5. pouring fast-hardening ultra-high performance concrete, 6. laying anti-cracking stickers, 7. spreading and compacting the asphalt surface layer, and 8. opening for traffic.

[0028] The utility model is suitable for the rapid repair of small hinged joints of in-service hollow slab beams. During the construction, there is no need to interrupt traffic, and only a part of the lane needs to be temporarily closed. The specific implementation method during the repair is provided below.

[0029] 1. Chisel off asphalt pavement

[0030] The chiseling edge of the asphalt pavement is about 60cm away from the hinge joint. Use a talcum pen or plaster to mark the chiseling range. Use a road cutter to cut along the marked area, and then use a pneumatic pick to break the asphalt pavement. Be careful not to damage the existing concrete pavement during the process. If the repair area is large, you can also use a milling machine to mill the asphalt pavement.

[0031] 2. Chisel off loose concrete pavement

[0032] After the asphalt pavement is removed, check whether the underlying concrete pavement is loose or cracked. If the local concrete pavement is found to be loose or cracked, it should be manually chiseled out with a pneumatic pick to expose the hard concrete surface.

[0033] 3. Plant the web L-shaped steel bars and weld them

[0034] Plant the web L-shaped steel bars on the existing old concrete pavement. The L-shaped steel bars are grade 3 steel bars with a diameter of 12 cm. The planting depth is not less than 20 cm, of which the depth into the web of the beam is not less than 12 cm. The spacing of the L-shaped steel bars is 40 cm, and the two sides are welded into a whole. The single-sided welding lap length is not less than 12 cm.

[0035] 4. Laying steel mesh

[0036] A layer of 8mm steel mesh with a mesh size of 200x200mm is laid on the existing old concrete pavement. The steel mesh pads are made of hard polyurethane with a thickness of 1.5cm-2cm. The pads are arranged in a plum blossom shape with a spacing of 2×2m.

[0037] 5. Casting fast-hardening ultra-high performance concrete

[0038] Cut the materials accurately according to the mix ratio, mix them evenly and then transport them to the designated location using a wheelbarrow. Use special leveling tools to smoothen the surface and ensure that the thickness of the new concrete pavement is not less than 5cm, including a top surface protective layer of not less than 2cm.

[0039] 6. Laying anti-crack stickers

[0040] After the rapid-hardening ultra-high performance concrete has initially set, anti-cracking tape can be laid across the concrete joints. The width of the anti-cracking tape is 15 cm and the thickness is 2 mm.

[0041] 7. Paving asphalt surface

[0042] One hour after the quick-hardening ultra-high performance concrete is poured, the asphalt surface layer can be paved manually with a spade, and then a 1-ton small roller can be used to roll it back and forth 4 to 5 times, and the surface joints should be rolled 1 to 2 more times. The formed asphalt surface layer should be smoothly connected with the existing road surface, the joint flatness should not exceed 2mm, and there should be no negative deviation.

[0043] 8. Open traffic

[0044] Traffic can be opened 2 hours after the quick-hardening ultra-high performance concrete is poured. If the asphalt temperature is slightly higher than 60 degrees at this time, measures such as sprinkling water or spreading talcum powder should be taken to cool it down.

Claims

1. A plate beam small hinge joint rapid reinforcement and repair structure, characterized by: It includes old concrete pavement layer, new concrete pavement layer, new asphalt pavement layer, and web L-shaped steel bars. The web L-shaped steel bars are planted in the beam web and the old concrete pavement layer on both sides of the hinge joint to be reinforced and repaired. The new concrete pavement layer and the new asphalt pavement layer are poured on the old concrete pavement layer. The new concrete pavement layer adopts fast-hardening ultra-high performance concrete with a compressive strength of ≥30Mpa within 2 hours and a 3d axial tensile strength of ≥5Mpa; the new asphalt pavement layer adopts SMA-13 ​​fine-grained asphalt concrete; the thickness of the new concrete pavement layer is 5 to 6cm; the thickness of the new asphalt pavement layer is 3 to 4cm.

2. The plate beam small hinged joint rapid reinforcement and repair structure according to claim 1 is characterized by: A layer of steel mesh is laid in the new concrete pavement.

3. The plate beam small hinged joint rapid reinforcement and repair structure according to claim 2 is characterized by: The steel mesh laid in the new concrete pavement is an 8mm steel mesh with a mesh size of 200x200mm, and the thickness of the concrete protective layer of the steel mesh is not less than 2cm.

4. The plate beam small hinged joint rapid reinforcement and repair structure according to claim 1 is characterized by: The width of the new concrete pavement layer exceeds the outermost hinged joint to be repaired by 50cm, and the corresponding new asphalt pavement layer exceeds the new concrete pavement layer by 10cm; a 15cm wide anti-cracking tape is laid on the new concrete pavement layer.

5. The plate beam small hinged joint rapid reinforcement and repair structure according to claim 1 is characterized by: The web L-shaped steel bars are made of grade 3 steel bars with a diameter of 12mm and a planting depth of not less than 20cm, of which the depth into the web of the beam is not less than 12cm. The web L-shaped steel bars are spaced 40cm apart and welded into a whole on both sides with a single-sided welded lap length of not less than 12cm.

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