A hinged joint connection structure for assembled beam bridge or slab bridge

Abstract

The present invention relates to a hinged joint connection structure of an assembled beam bridge or a slab bridge, comprising an assembled beam or slab, a U-shaped steel bar, an L-shaped steel bar, a longitudinal steel bar, a short transverse bar, a bolt and a connecting steel plate. Two bolts are welded with the short transverse bar, the L-shaped steel bar is welded with the short transverse bar, the U-shaped steel bar is welded on the L-shaped steel bar at the upper and lower positions to form a steel bar group, two assembled beams or slabs with a plurality of pre-embedded steel bar groups are butt-jointed and seated on the connecting steel plate and fixed by pre-embedded bolts, the L-shaped steel bars are overlapped and fixed by binding, and the longitudinal steel bars pass through the overlapping U-shaped steel bars and are fixed by binding. The beneficial effects are as follows: the hinged joint runs through the entire section of the beam-slab bridge, which can solve the problem that the bottom hinged joint concrete cracks easily caused by the reserved expansion joint in the design, improve the hinged joint connection quality, the integrity of the connected beam (slab) bridge is good, the force is more uniform, the bearing capacity is increased, the durability of the hinged joint is increased, and the service life of the beam (slab) bridge is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction engineering, and in particular to a hinged joint connection structure of an assembled beam bridge or a slab bridge. Background Art

[0002] With the rapid development of my country's social economy, highway traffic construction has made great progress. As a link in highway traffic, bridges are numerous and technically difficult, and are prone to various diseases during use. According to the data of the "Statistical Bulletin on the Development of the Transportation Industry in 2018", the number of bridges in my country is currently increasing year by year, and most of them are small and medium-span bridges. Among small and medium-span bridges, prefabricated beam (plate) bridges have been widely used in bridge engineering due to their advantages of prefabrication, installation, simple construction technology, and low engineering cost. The hinge joint of the bridge plays an important role in the lateral connection force. It is both a key part and a weak part. In real projects, due to the influence of design factors, construction factors and use environment factors, the hinge joint is easy to be damaged. Once the hinge joint is damaged, if it is not reinforced in time, it will gradually form a through seam, and finally form a single plate force, resulting in diseases and damage.

[0003] At present, the typical traditional hinged joint structure is Figure 4 As shown, there are mainly the following defects:

[0004] 1) The setting of embedded steel bars is complicated, which is not conducive to the compaction of poured concrete, and the quality of hinged joints is not high, which may cause hinged joint diseases;

[0005] 2) The hinged joint is limited to the reserved gap for pouring concrete on the upper part of the two butt-jointed beams and slabs. The integrity of the connected beam (slab) bridge is poor, the force is not good, and the bearing capacity is small, which affects the function of the hinged joint;

[0006] 3) A 1cm expansion joint is reserved at the bottom of the hinge joint, which may cause the bottom concrete to crack under the repeated action of vehicle loads;

[0007] 4) The durability of hinged joints is poor and the service life of beam (slab) bridges is short. Summary of the invention

[0008] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide a hinged joint connection structure for an assembled beam bridge or slab bridge. The hinged joint runs through the entire cross-section of the beam-slab bridge, which can solve the problem that the reserved expansion joint in the design easily leads to cracking of the bottom hinged joint concrete, improve the quality of the hinged joint connection, and the integrity of the connected beam (slab) bridge is good, the force is more uniform, the bearing capacity is increased, the durability of the hinged joint is increased, and the service life of the beam (slab) bridge is improved.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A hinged joint connection structure of an assembled beam bridge or a slab bridge, comprising an assembled beam or slab, U-shaped steel bars, L-shaped steel bars, longitudinal steel bars, short transverse bars, bolts and connecting steel plates, characterized in that the bolts are arranged in groups of two at a certain distance and are welded and fixed at the ends of the bolt caps with short transverse bars, the end of one side of the L-shaped steel bar is welded to the middle of the short transverse bar, and the other side is suspended in the air and the direction is consistent with the length direction of the short transverse bar, there are two U-shaped steel bars, which are arranged up and down along the L-shaped steel bar and welded and fixed with the L-shaped steel bar to form a steel bar group, and several steel bar groups are respectively embedded in the side parts in the width direction of two assembled beams or slabs to be overlapped and assembled together; the assembled beams or slabs are butt-jointed and seated on the connecting steel plate and are connected and fixed by embedded bolts, wherein the embedded U-shaped steel bars are overlapped and overlapped, and the embedded L-shaped steel bars are also overlapped and overlapped and tied and fixed together; there are two longitudinal steel bars, which respectively pass through the overlapping U-shaped steel bars and are tied and fixed together with them.

[0011] The distance between the U-shaped steel bar and the upper and lower surfaces of the prefabricated beam or slab is ≥ 5 cm, the length buried in the concrete of the prefabricated beam or slab is ≥ 10 cm, and the length extending out of the prefabricated beam or slab should ensure that it overlaps with the length of the corresponding U-shaped steel bar extending out of the adjacent prefabricated beam or slab during lap assembly, and the overlapping distance is ≥ the diameter of the longitudinal steel bar.

[0012] The distance between the L-shaped steel bar and the upper surface of the prefabricated beam or slab is ≥ 5 cm, the length buried in the concrete of the prefabricated beam or slab is ≥ 10 cm, and the length extending out of the prefabricated beam or slab should ensure that it overlaps with the length of the corresponding L-shaped steel bar extending out of the adjacent prefabricated beam or slab during lap assembly, and the overlapping distance is ≥ 10 cm.

[0013] The diameter of the longitudinal steel bar is the same as the diameter of the embedded steel bar of the assembled beam or plate, the length runs through the length of the assembled beam or plate, and the distance between the two ends and the outer surface of the assembled beam or plate in the length direction is ≧5 cm.

[0014] The connecting steel plate is provided with long installation holes matching with the bolts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) The setting of the steel bars is simpler and more effective than that of the traditional hinged joint steel bars, which is conducive to vibration compaction, so that the construction quality of the hinged joint is effectively guaranteed and the hinged joint is prevented from being damaged due to construction quality problems;

[0017] 2) Compared with the traditional hinged joint, the whole formed by the new hinged joint and the assembled beam (plate) of the invention is more solid and has better overall force bearing capacity, which can better play the role of the hinged joint and reduce hinged joint diseases;

[0018] 3) Compared with the traditional hinged joint, the new hinged joint device of the invention is provided with a steel plate and bolts at the bottom of the assembled beam (plate) for anchoring. The steel plate has high tensile strength, which can well solve the problem of concrete cracking. At the same time, the bearing capacity and shear strength of the hinged joint device are significantly improved;

[0019] 4) By comparing and analyzing the traditional hinged joint and the new hinged joint, taking the 8m standard span hollow slab and cutting out 0.5m lengthened and reduced size specimens as an example for testing, it is found that the bearing capacity of the new hinged joint is at least 42% higher than that of the traditional hinged joint; by comparing the deflections at the supports and the bottom of the hinged joints of the two hinged joint specimens, under the same load, the deflection of the new hinged joint specimen is always smaller than that of the traditional hinged joint specimen; the deflection at the support of the new hinged joint is reduced by 30.01%, and the deflection at the bottom of the hinged joint is reduced by 31.37%, indicating that the deformation resistance of the new hinged joint of the invention is at least 30% higher; in summary, whether it is the bearing capacity or the deformation resistance of the hinged joint, the new hinged joint of the invention is far superior to the traditional hinged joint, and can better play the role of transferring lateral loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structural principle of the present invention;

[0021] Figure 2 It is a three-dimensional schematic diagram (cutaway) of the structural principle of the present invention;

[0022] Figure 3 It is a schematic diagram of the connection relationship structure principle of the embedded steel bar group of the present invention;

[0023] Figure 4 It is a schematic diagram of the principle of an existing typical traditional hinged joint structure.

[0024] In the figure: 1-bridge deck pavement 2-assembled beam or plate 3-U-shaped steel bar 4-L-shaped steel bar 5-longitudinal steel bar 6-short transverse bar 7-bolt 8-connecting steel plate DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0026] See Figure 1-Figure 3As shown, the present invention relates to a hinged joint connection structure of an assembled beam bridge or a slab bridge, comprising an assembled beam or slab 2, a U-shaped steel bar 3, an L-shaped steel bar 4, a longitudinal steel bar 5, a short transverse bar 6, a bolt 7 and a connecting steel plate 8, wherein the bolts 7 are in groups of two and are welded and fixed at a certain distance at the end of the bolt cap with the short transverse bar 6, the end of one side of the L-shaped steel bar 4 is welded to the middle of the short transverse bar 6, and the other side is suspended and the direction is consistent with the length direction of the short transverse bar 6, there are two U-shaped steel bars 3, which are arranged up and down along the L-shaped steel bar 4 and welded and fixed with the L-shaped steel bar 4 to form a steel bar group, and several steel bar groups are respectively embedded in the side parts in the width direction of two assembled beams or slabs 2 to be overlapped and assembled together; the assembled beam or slab 2 is butt-jointed and seated on the connecting steel plate 8 and connected and fixed by the embedded bolts 7, wherein the embedded U-shaped steel bars 3 are overlapped and overlapped, and the embedded L-shaped steel bars 4 are also overlapped and overlapped and tied together; there are two longitudinal steel bars 5, which pass through the overlapping U-shaped steel bars 3 respectively and are tied and fixed together with them.

[0027] The distance between the U-shaped steel bar 3 and the upper and lower surfaces of the prefabricated beam or slab 2 is ≧5cm (leaving enough concrete thickness for a safety layer), the length buried in the concrete of the prefabricated beam or slab 2 is ≧10cm, and the length extending out of the prefabricated beam or slab 2 should ensure that it overlaps with the length of the corresponding U-shaped steel bar 3 extending out of the prefabricated beam or slab of the adjacent prefabricated beam or slab 2 during lap assembly, and the overlapping distance is ≧the diameter of the longitudinal steel bar 5, which makes it easy to insert the longitudinal steel bar 5 and ensures the quality of the lap.

[0028] The distance between the L-shaped steel bar 4 and the upper surface of the prefabricated beam or slab 2 is ≥ 5 cm (leaving enough concrete thickness for a safety layer), the length buried in the concrete of the prefabricated beam or slab 2 is ≥ 10 cm, and the length extending out of the prefabricated beam or slab 2 should ensure that it overlaps with the length of the corresponding L-shaped steel bar 4 extending out of the prefabricated beam or slab 2 of the adjacent prefabricated beam or slab 2 during lap assembly, and the overlapping distance is ≥ 10 cm to ensure the quality of binding.

[0029] The diameter of the longitudinal reinforcement 5 is the same as the diameter of the embedded reinforcement of the assembled beam or plate 2, and the length runs through the length of the assembled beam or plate 2. The distance between the two ends and the outer surface of the length direction of the assembled beam or plate 2 is ≧5 cm, leaving enough safety layer concrete thickness.

[0030] The connecting steel plate 8 is provided with a mounting slotted hole matching the bolt 7 , so as to facilitate adjustment of the position of the bolt 7 when hoisting the assembled beam or plate 2 .

[0031] On-site installation and construction process:

[0032] 1) Place the connecting steel plate 8 on the bridge pier;

[0033] 2) hoist the assembled beams or plates 2 of the two embedded steel bar groups respectively, and make the embedded bolts 7 pass through the installation long holes provided on the connecting steel plate 8, and butt-sit on the connecting steel plate 8;

[0034] 3) tying and fixing the overlapping pre-buried L-shaped steel bars 4 together, and passing the two longitudinal steel bars 5 through the overlapping U-shaped steel bars 3 respectively and tying and fixing them together;

[0035] 4) Tighten the bolts 7 and nuts to fix them to the connecting steel plate 8 to complete the hinged joint;

[0036] 5) Pour concrete at the hinge joint;

[0037] 6) Pour the bridge deck pavement layer 1.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hinged joint connection structure of an assembled beam bridge or a slab bridge, comprising an assembled beam or slab, a U-shaped steel bar, an L-shaped steel bar, a longitudinal steel bar, a short transverse steel bar, a bolt and a connecting steel plate, characterized in that: The bolts are arranged in groups of two at a certain distance and are welded and fixed at the ends of the bolt caps with short transverse bars. The end of one side of the L-shaped steel bar is welded to the middle of the short transverse bar, and the other side is suspended in the air and the direction is consistent with the length direction of the short transverse bar. There are two U-shaped steel bars, which are arranged up and down along the L-shaped steel bar and welded and fixed to the L-shaped steel bar to form a steel bar group. Several steel bar groups are respectively embedded in the sides in the width direction of two prefabricated beams or plates to be overlapped and assembled together; the prefabricated beams or plates are butt-jointed and seated on the connecting steel plates and are connected and fixed by embedded bolts, wherein the embedded U-shaped steel bars are overlapped, and the embedded L-shaped steel bars are also overlapped and tied together; there are two longitudinal steel bars, which respectively pass through the overlapping U-shaped steel bars and are tied together with them.

2. The hinged joint connection structure of a prefabricated beam bridge or slab bridge according to claim 1, characterized in that: The distance between the U-shaped steel bar and the upper and lower surfaces of the prefabricated beam or slab is ≥ 5 cm, the length buried in the concrete of the prefabricated beam or slab is ≥ 10 cm, and the length extending out of the prefabricated beam or slab should ensure that it overlaps with the length of the corresponding U-shaped steel bar extending out of the adjacent prefabricated beam or slab during lap assembly, and the overlapping distance is ≥ the diameter of the longitudinal steel bar.

3. The hinged joint connection structure of a prefabricated beam bridge or slab bridge according to claim 1, characterized in that: The distance between the L-shaped steel bar and the upper surface of the prefabricated beam or slab is ≥ 5 cm, the length buried in the concrete of the prefabricated beam or slab is ≥ 10 cm, and the length extending out of the prefabricated beam or slab should ensure that it overlaps with the length of the corresponding L-shaped steel bar extending out of the adjacent prefabricated beam or slab during lap assembly, and the overlapping distance is ≥ 10 cm.

4. The hinged joint connection structure of a prefabricated beam bridge or slab bridge according to claim 1, characterized in that: The diameter of the longitudinal steel bar is the same as the diameter of the embedded steel bar of the assembled beam or plate, the length runs through the length of the assembled beam or plate, and the distance between the two ends and the outer surface of the assembled beam or plate in the length direction is ≧5 cm.

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