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CN-224199777-U - Railing with adjustable be applicable to bridge expansion joint department

CN224199777UCN 224199777 UCN224199777 UCN 224199777UCN-224199777-U

Abstract

The utility model discloses an adjustable railing suitable for a bridge expansion joint, which comprises a first fixed railing and a second fixed railing which are respectively and rigidly connected to two sides of the expansion joint, wherein the first fixed railing and the second fixed railing are connected through a displacement self-adaptive unit, the displacement self-adaptive unit comprises an adjusting beam, an adjusting upright post and a fixed upright post which are fixedly connected, two ends of the adjusting beam are respectively and movably spliced and matched with the first fixed railing and the second fixed railing on two sides, and the adjusting upright post is in sliding fit with a sliding base arranged on a bridge. The durability of fixed railing one and fixed railing two of expansion joint both sides has been guaranteed to this technical scheme, can adapt to the expend with heat and contract with cold phenomenon because of temperature variation produces, also can adapt to the dynamic deformation because of the vehicle load causes, can also adapt to the bridge floor vertical or horizontal displacement because of the inhomogeneous subsidence of ground leads to, and the efficiency of construction is high and environmental suitability is strong, also is convenient for maintain and change simultaneously.

Inventors

  • QIU WULONG
  • WANG JUNLE
  • TIAN RENQIANG
  • CHEN XIAO

Assignees

  • 中国建筑第七工程局有限公司

Dates

Publication Date
20260505
Application Date
20250530

Claims (10)

  1. 1. The adjustable railing suitable for the bridge expansion joint comprises a first fixed railing (1) and a second fixed railing (2) which are respectively and rigidly connected to two sides of the expansion joint, and is characterized in that the first fixed railing (1) and the second fixed railing (2) are connected through a displacement self-adaptive unit (3), the displacement self-adaptive unit (3) comprises an adjusting cross beam (31), an adjusting stand column (32) and a fixed stand column (33) which are fixedly connected, two ends of the adjusting cross beam (31) are respectively in movable plug-in fit with the first fixed railing (1) and the second fixed railing (2) on two sides, and the adjusting stand column (32) is in sliding fit with a sliding base (4) arranged on a bridge.
  2. 2. The adjustable railing of claim 1, wherein the adjusting beam (31) is connected with two adjusting columns (32), sliding bases (4) are arranged on two sides of the expansion joint, and the two adjusting columns (32) are respectively in sliding fit with the sliding bases (4) on two sides of the expansion joint.
  3. 3. The adjustable railing suitable for the bridge expansion joint according to claim 1 or 2, wherein the sliding base (4) comprises a profile steel cavity (41) arranged at the expansion joint, a fixed support (42) is arranged in the profile steel cavity (41), a horizontal sliding groove (421) is formed in the middle of the fixed support (42), and a sliding end (321) matched with the horizontal sliding groove (421) is connected to the lower end of the adjusting upright post (32).
  4. 4. The adjustable rail for the bridge expansion joint of claim 3, wherein the section steel cavity (41) comprises an L-shaped steel bottom plate (411) fixedly connected with the bridge, an L-shaped steel top plate (412) serving as a cover plate is detachably connected with the L-shaped steel bottom plate (411), the sliding base (4) is fixedly connected to the L-shaped steel bottom plate (411), and a movable hole (4121) for the adjusting upright post (32) to pass through and move is formed in the L-shaped steel top plate (412).
  5. 5. The adjustable rail for the bridge expansion joint of claim 4, wherein the vertical part of the L-shaped steel bottom plate (411) is directly connected with the bridge through expansion bolts, and the transverse part of the L-shaped steel bottom plate (411) and the sliding base (4) share the expansion bolts connected with the bridge.
  6. 6. The adjustable rail for the bridge expansion joint according to claim 4 or 5, wherein the L-shaped steel bottom plate (411) and the L-shaped steel top plate (412) are connected through bolts to form a section steel cavity (41) with a rectangular cross section.
  7. 7. The adjustable rail for bridge expansion joints according to claim 6, wherein the lower end of the adjusting upright (32) is connected with the upper end of the sliding end head (321) through a mutually matched horizontal flange (322).
  8. 8. The adjustable rail for the bridge expansion joint according to any one of claims 1-2, 4-5 and 7, wherein the end part of the first fixed rail (1), the end part of the second fixed rail (2) and the two ends of the adjusting beam (31) are respectively provided with a vertical flange (311), and a horizontal bolt group (312) which is used for adapting to each displacement and has a displacement range limitation is arranged through the adjacent vertical flanges (311) in a sliding manner.
  9. 9. The adjustable rail for the bridge expansion joint according to claim 8, wherein the movable plug-in fit structure comprises small diameter sections for adjusting two ends of the cross beam (31) and large diameter sections for fixing the ends of the first rail (1) and the second rail (2), or comprises large diameter sections for adjusting two ends of the cross beam (31) and small diameter sections for fixing the ends of the first rail (1) and the second rail (2).
  10. 10. The adjustable rail for the bridge expansion joint according to any one of claims 1-2, 4-5, 7 and 9, wherein the number of the adjusting beams (31) is the same as the number of the fixed beams in the first fixed rail (1) and the second fixed rail (2), and each adjusting beam (31) is movably inserted and matched with each fixed beam.

Description

Railing with adjustable be applicable to bridge expansion joint department Technical Field The utility model relates to the technical field of bridge railings, in particular to an adjustable railing suitable for a bridge expansion joint. Background In bridge engineering, an expansion joint is a construction joint for satisfying linear deformation of a bridge deck structure caused by factors such as temperature change, vehicle load action, uneven settlement of a foundation and the like. The railing at the expansion joint is used as an important component of the bridge safety protection system, and the fixing device of the railing needs to meet the dual requirements of structural stability and displacement adaptability. However, in the prior art, a rigid connection structure is generally adopted for fixing the railing at the expansion joint, and the rigid connection structure mainly comprises two forms of rigid welding fixation and bolt anchoring combined concrete pouring fixation, so that obvious technical defects are exposed in the long-term use process. The rigid welding and fixing structure is formed by directly welding and connecting the railing post and a steel plate pre-buried in the bridge main body structure. The welding process provides a high initial strength of connection but completely limits the relative displacement between the rail and the bridge body. When the bridge expands with heat and contracts with cold due to temperature change (for example, the expansion and contraction amount of the bridge deck structure can reach 50-100mm due to temperature difference), or dynamic deformation caused by vehicle load (such as instantaneous flexural deformation generated when a heavy-duty vehicle passes through), and bridge deck longitudinal or transverse displacement caused by uneven settlement of a foundation, stress concentration can be formed at a rigid connection point. The measured data show that the stress concentration can lead the local stress of the connecting area to reach 1.5-2 times of the yield strength of the material, and the failure modes such as weld joint cracking, column root parent metal cracking and the like are caused. A highway bridge detection report shows that the welding seam cracking rate is 67% after the operation for 3-5 years by adopting the expansion joint railing fixed by rigid welding, so that the bridge safety protection function is seriously affected. The bolt anchoring and concrete pouring is carried out by embedding a bolt sleeve in a bridge main body structure, connecting the railing post with a high-strength bolt, and then adopting concrete or mortar to wrap and fix the connecting node. The structure avoids high-temperature operation of field welding, but the space between the bolt anchorage points is fixed (usually 500-800 mm) and cannot adapt to the dynamic displacement of the expansion joint. When the bridge deck is longitudinally displaced, the relative displacement between the railing post and the bridge main body can lead to the composite action of shearing force and tensile force born by the bolts. Test data show that when the displacement exceeds the effective regulation range (usually less than or equal to 10 mm) of the bolt, the bolt rod is easy to shear and break, and the concrete coating layer can crack and peel under the repeated displacement. In addition, the device needs to be installed by bolts, poured by concrete and maintained on site, the construction period is as long as 3-5 days, and the strength of the concrete in a low-temperature environment (such as below 5 ℃) is slowly increased, so that the construction progress is seriously influenced. Statistics of certain municipal bridge engineering show that the rail with the expansion joint adopting the fixing mode has the rail inclination rate reaching 42% caused by bolt failure after the rail encounters extreme temperature change (the temperature difference exceeds 30 ℃), and has great potential safety hazard. In summary, the conventional rigid connection structure has insufficient displacement adaptability, and has the essential defect that the rail and the bridge body are regarded as a rigid whole, and the dynamic displacement requirement at the expansion joint is ignored. The displacement of the bridge expansion joint comprises longitudinal (along the axle axis direction), transverse (perpendicular to the axle axis direction) and vertical (perpendicular to the bridge deck direction) multidimensional deformation, wherein the longitudinal displacement is a main deformation form (the displacement amount is generally designed to be +/-20 mm to +/-100 mm). The rigid connection cannot absorb such displacement, so that the connection node becomes a structural weak link, and finally fatigue failure is initiated. Meanwhile, the construction efficiency and the environmental adaptability are poor, professional equipment and operators are required to be equipped for field welding and are limited by weathe