CN113699882A - Anti-falling beam expansion joint device and working method thereof - Google Patents
Anti-falling beam expansion joint device and working method thereof Download PDFInfo
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- CN113699882A CN113699882A CN202110754654.3A CN202110754654A CN113699882A CN 113699882 A CN113699882 A CN 113699882A CN 202110754654 A CN202110754654 A CN 202110754654A CN 113699882 A CN113699882 A CN 113699882A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E01D19/065—Joints having sliding plates
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Abstract
本发明公开了一种防落梁伸缩缝装置，包括相对设置的固定板和跨缝活动板，所述固定板内端设置多个第一梳齿，所述跨缝活动板内端设置多个第二梳齿，所述第一梳齿和第二梳齿交错间隔排布，所述第一梳齿的顶端设置有增宽的第一梳齿头，所述第二梳齿的顶端设置有增宽的第二梳齿头；所述第二梳齿头的宽度大于两个相邻所述第一梳齿头之间的间隙。本发明防落梁伸缩缝装置及其工作方法，地震时能够限定桥梁梁端位移，梁端在伸缩缝位置不会分离，防止梁端落梁，提高了安全性能。
The invention discloses an expansion joint device for an anti-drop beam, comprising a fixed plate and a movable plate across the seam, which are oppositely arranged. Second comb teeth, the first comb teeth and the second comb teeth are alternately arranged at intervals, the top of the first comb teeth is provided with a widened first comb tooth head, and the top end of the second comb teeth is provided with a widened first comb tooth head. A widened second comb-tooth head; the width of the second comb-tooth head is greater than the gap between two adjacent first comb-tooth heads. The anti-drop beam expansion joint device and its working method of the invention can limit the displacement of the bridge beam end during earthquake, the beam end will not be separated at the expansion joint position, prevent the beam end from falling off the beam, and improve the safety performance.
Description
Technical Field
The invention relates to the technical field of building expansion joints, in particular to a girder-falling-preventing expansion joint device and a working method thereof.
Background
In order to meet the requirement of bridge deck deformation, expansion joints are usually provided between two beam ends, between a beam end and an abutment, or at the hinge joint of a bridge. The bridge expansion joints are capable of accommodating displacements and couplings between the superstructure caused by vehicle loads and bridge building materials. At the position of the expansion joint, the handrail and the bridge deck pavement are disconnected. The expansion joint of bridge has a great variety, and wherein, the multidirectional broach bridge expansion joint device that shifts has comparatively extensive application, and multidirectional broach bridge expansion joint device that shifts has that the structure height is low, application range is wide, the driving is steady, advantages such as antiskid.
A large amount of research data of bridge earthquake damage show that the beam falling at the beam end of the bridge is a common disaster form during earthquake, and great life and property loss is caused. The performance improvement of the expansion joint of the ligament bridge connected with the beam end of the bridge in the aspects of earthquake prevention and disaster resistance is not carried out, and the research work in the aspect is also lacked.
Therefore, it is required to develop an anti-falling beam expansion joint device and a working method thereof.
Disclosure of Invention
The invention aims to provide an anti-beam-falling expansion joint device, which can limit the displacement of a bridge end during earthquake, prevent the separation of the beam end at the expansion joint, prevent the beam end from falling off, and improve the safety performance.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses an anti-falling beam expansion joint device which comprises a fixed plate and a seam crossing movable plate which are oppositely arranged, wherein a plurality of first comb teeth are arranged at the inner end of the fixed plate, a plurality of second comb teeth are arranged at the inner end of the seam crossing movable plate, the first comb teeth and the second comb teeth are arranged at intervals in a staggered mode, the top ends of the first comb teeth are provided with widened first comb tooth heads, and the top ends of the second comb teeth are provided with widened second comb tooth heads; the width of the second comb tooth head is larger than the gap between two adjacent first comb tooth heads.
Furthermore, the horizontal cross sections of the first comb teeth head and the second comb teeth head are both rectangular, the first comb teeth head is overlapped with the longitudinal central plane of the first comb teeth, and the second comb teeth head is overlapped with the longitudinal central plane of the second comb teeth.
The beam-end concrete material is vertically poured in the beam-end concrete material, and the top end of the first tensile pin shaft is in pin joint with the first pin shaft hole; and a second pin shaft hole is formed in the outer end of the seam crossing movable plate, the second tensile pin shaft is vertically poured in the concrete material at the beam end, and the top end of the second tensile pin shaft is in pin joint with the second pin shaft hole.
Furthermore, the first tensile pin shafts and the L-shaped bolts for fixing the fixing plate are arranged at intervals; and the second tensile pin shafts are arranged among the L-shaped bolts for fixing the seam crossing movable plate at equal intervals.
Furthermore, the top surface of striding seam fly leaf is provided with anti-skidding line, anti-skidding line sunken seting in between second broach root and the L type bolt mounting hole.
Furthermore, limiting grooves are formed in two sides of the lower portion of the first comb teeth, side limiting blocks are arranged on two sides of the lower portion of the second comb teeth in an extending mode, and the side limiting blocks extend into the limiting grooves.
Furthermore, movable gaps are reserved on the top and the outer side wall of the side limiting block in the limiting groove.
Furthermore, a waist-shaped hole is formed in the middle of the second comb teeth, the waist-shaped hole is formed in the length direction of the second comb teeth, a limiting bolt is arranged in the waist-shaped hole, the head of the limiting bolt is arranged in the waist-shaped hole, and the bottom of the limiting bolt is fixedly connected to a beam-end concrete material.
Furthermore, the left end and the right end of the fixed plate and the seam crossing movable plate are respectively provided with a protruding head and a groove structure which can be mutually meshed.
The invention also discloses a working method of the girder falling prevention expansion joint device, the girder falling prevention expansion joint device is used for preventing the girder from falling, and the comb teeth heads which are mutually meshed at the limit positions are used for preventing the girder end from separating.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the girder-falling-preventing expansion joint device, the first comb tooth heads and the second comb tooth heads are respectively arranged at the top end parts of the tooth comb plates, the width of each second comb tooth head is larger than the gap between every two adjacent first comb tooth heads, and when the separation distance of a girder end is larger than the lap joint limit design distance of the expansion joint comb plate under the conditions of earthquakes and the like, the second comb tooth heads are clamped between every two adjacent first comb tooth heads and are mutually meshed, so that the girder end is limited to be continuously separated, and the girder end is prevented from being separated from a bridge pier. The beam falling prevention expansion joint device can limit the displacement of the beam end of the bridge during earthquake, the beam end can not be separated at the expansion joint, the beam falling of the beam end is prevented, and the safety performance is improved.
In addition, through the first broach head and the second broach head of rectangle shape that the symmetry set up, the distance is unanimous for both sides are stretched out, and the uniformity is good and the processing production of being convenient for, and both sides atress is even when the interlock moreover, can not form local plastic deformation, has improved life. Through the setting of first tensile round pin axle and second tensile round pin axle, can increase the joint strength of fixed plate and striding seam fly leaf respectively with the beam-ends, avoid taking place the condition that the fixed plate or striding seam fly leaf drops under the earthquake wave impact. The anti-slip lines with the wave lines or the triangular sawtooth lines are arranged, so that the attractiveness of the anti-falling beam expansion joint device is improved, the anti-slip performance is improved, and the vehicle tire is prevented from impacting the comb teeth after slipping on the surface of the wet and slippery expansion joint. The side limiting block is matched with the limiting groove to form a height direction anti-falling structure, namely, under the limit conditions of earthquakes and the like, when the beam end below the seam crossing movable plate is upwards lifted by the earthquake, the side limiting block is limited in the limiting groove, and the dangerous condition that the seam crossing movable plate is continuously lifted and separated from the fixed plate to cause beam falling is avoided. Through the spacing groove, the top and the side wall of the side limiting block are provided with movable gaps, so that the normal expansion margin of the bridge can be ensured, and the bridge internal stress is prevented from being increased due to clamping. The hinge shaft mechanism that shifts sets up through the corner of being convenient for striding the seam fly leaf shifts, and the seam fly leaf is striden in the actuation can the setting of magnet, avoids getting into the perk of bottom joint debris, has reduced the noise moreover. The first-stage limiting blocking formed by the waist-shaped holes and the limiting bolts is added, the comb teeth at the second stage are meshed to block, seismic wave impact is buffered in a two-stage mode, the damage probability of the expansion joint device is reduced, and the service life of the device is prolonged. The mutually meshed raised head and groove structures are arranged between the adjacent seam crossing movable plates or the adjacent fixed plates, so that all units in the whole width direction can be connected into a whole, the condition that the fixed plates or the seam crossing movable plates fall off singly under the limit condition is avoided, and the safety performance of the girder falling prevention expansion joint device is improved.
The invention relates to a working method of a girder-falling-preventing expansion joint device, which adopts comb teeth heads which are mutually meshed at limit positions to prevent girder ends from separating. Through the height direction anti-drop structure that the spacing groove of side stopper cooperation formed, can further prevent that the roof beam end from receiving the roof beam that falls that the lifting caused that shakes.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
Fig. 1 is a schematic top view of an expansion joint device 1 according to an embodiment of the present invention;
fig. 2 is a schematic sectional view of a front view of an expansion joint device for preventing girder from falling in accordance with an embodiment 1 of the present invention;
FIG. 3 is a schematic top view of a part of the structure of embodiment 2 of the present invention;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic top view of the structure of embodiment 3 of the present invention;
fig. 6 is a schematic cross-sectional structural view of a plurality of cross-slit movable plates in embodiment 3 of the present invention.
Description of reference numerals: 1. a fixing plate; 101. a first comb tooth; 1011. a limiting groove; 102. a first comb-tooth head; 103. a first nose; 2. a seam crossing movable plate; 201. a second comb tooth; 202. a second comb-tooth head; 2021. A side limiting block; 203. anti-skid lines; 204. a kidney-shaped hole; 205. a second nose; 206. a second groove; 3. a first tensile pin; 4. a second tensile pin shaft; 5. and a limiting bolt.
Detailed Description
The invention provides an anti-girder-falling expansion joint device and a working method thereof, which can limit the displacement of a bridge girder end during earthquake, prevent the girder end from falling off at the expansion joint and improve the safety performance.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to the attached drawings, fig. 1 is a schematic top view of an expansion joint device 1 according to an embodiment of the present invention;
fig. 2 is a schematic sectional view of a front view of an expansion joint device for preventing girder from falling in accordance with an embodiment 1 of the present invention; FIG. 3 is a schematic top view of a part of the structure of embodiment 2 of the present invention; FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3; 5 is a schematic top view structure diagram of embodiment 3 of the present invention; fig. 6 is a schematic cross-sectional structural view of a plurality of cross-slit movable plates in embodiment 3 of the present invention.
Set up first broach head 102 and second broach head 202 respectively through the top portion at the tooth comb board, and the width of second broach head 202 is greater than the clearance between two adjacent first broach heads 102, under the circumstances such as earthquake, when the beam-ends break away from the limit design distance that is greater than expansion joint comb plate overlap joint, second broach head 202 joint is to between two adjacent first broach heads 102 to interlock each other, restriction beam-ends continue to break away from, prevents that the beam-ends from breaking away from the pier. The beam falling prevention expansion joint device can limit the displacement of the beam end of the bridge during earthquake, the beam end can not be separated at the expansion joint, the beam falling of the beam end is prevented, and the safety performance is improved.
In a specific embodiment of this embodiment, as shown in fig. 1 and 2, the first comb-tooth head 102 and the second comb-tooth head 202 have rectangular horizontal cross-sections, the first comb-tooth head 102 coincides with the longitudinal center plane of the first comb-tooth 101, and the second comb-tooth head 202 coincides with the longitudinal center plane of the second comb-tooth 201. Obviously, the horizontal cross-section of the first comb-tooth head 102 and the horizontal cross-section of the second comb-tooth head 202 may also be in a trapezoidal shape, a semicircular shape or a triangular shape, so long as the first comb-tooth head and the second comb-tooth head can be engaged with each other at the extreme position and can be prevented from falling off, and similar deformation modes fall into the protection scope of the present invention.
Through the first comb-tooth head 102 and the second comb-tooth head 202 which are symmetrically arranged and have the rectangular shapes, the extending distances of the two sides are consistent, the consistency is good, the processing and the production are convenient, the stress of the two sides is even during occlusion, the local plastic deformation cannot be formed, and the service life is prolonged.
In a specific embodiment of this embodiment, as shown in fig. 1 and fig. 2, the beam falling prevention expansion joint device further includes a first tensile pin shaft 3 and a second tensile pin shaft 4, the outer end of the fixing plate 1 is provided with a first pin shaft hole, the first tensile pin shaft 3 is vertically poured in the concrete material at the beam end, and the top end of the first tensile pin shaft is pinned in the first pin shaft hole. The outer end of the seam crossing movable plate 2 is provided with a second pin shaft hole, the second tensile pin shaft 4 is vertically poured in the beam end concrete material, and the top end of the second tensile pin shaft is in pin joint with the second pin shaft hole. Furthermore, the bottoms of the first tensile pin shaft 3 and the second tensile pin shaft 4 are welded to a steel reinforcement framework at the end of the bridge beam.
Specifically, as shown in fig. 1 and 2, the plurality of first tensile pins 3 are spaced apart from the L-bolts that fix the fixing plate 1. A plurality of second tension pin shafts 4 are arranged at equal intervals between the L-shaped bolts that fix the slot-spanning movable plate 2. Obviously, the fixed plate 1 and the seam crossing movable plate 2 can also adopt other mounting modes of anchor bolts and even welding to a beam-end steel reinforcement framework.
Through the arrangement of the first tensile pin shaft 3 and the second tensile pin shaft 4, the connection strength of the fixed plate 1 and the seam crossing movable plate 2 with the beam end can be increased, and the situation that the fixed plate 1 or the seam crossing movable plate 2 falls off under the impact of seismic waves is avoided.
In a specific embodiment of the present embodiment, as shown in fig. 1 and 2, the top surface of the seam-spanning plate 2 is provided with anti-slip lines 203, and the anti-slip lines 203 are recessed between the roots of the second comb teeth 201 and the L-shaped bolt mounting holes.
Specifically, as shown in fig. 1 and fig. 2, the anti-slip pattern 203 specifically adopts a wavy pattern or a triangular sawtooth pattern.
The anti-slip lines 203 with the wave lines or the triangular sawtooth lines are arranged, so that the attractiveness of the anti-falling beam expansion joint device is improved, the anti-slip performance is improved, and the vehicle tire is prevented from impacting the comb teeth after slipping on the surface of a wet and slippery expansion joint.
In embodiment 2, as shown in fig. 3 and 4, a height-direction anti-falling structure is added to the anti-falling beam expansion joint device of the present invention on the basis of embodiment 1, so as to form this embodiment. The two sides of the lower part of the first comb teeth 101 are provided with limit grooves 1011, the two sides of the lower part of the second comb teeth head 202 extend out and are provided with side limit blocks 2021, and the side limit blocks 2021 extend into the limit grooves 1011.
The side limiting block 2021 is matched with the limiting groove 1011 to form a height direction anti-falling structure, namely, under the limit conditions of an earthquake and the like, when the beam end below the seam crossing movable plate 2 is upward lifted by the earthquake, the side limiting block 2021 is limited in the limiting groove 1011, so that the seam crossing movable plate 2 is prevented from being continuously lifted and separated from the fixed plate 1 to cause the beam falling danger.
Specifically, as shown in fig. 3 and 4, the side stopper 2021 has a clearance between the top and the outside of the side wall of the stopper groove 1011.
Specifically, the outer end of the seam crossing movable plate 2 is provided with a position-changing hinge shaft mechanism, and a magnet for attracting is poured in a concrete material below the second comb teeth 201.
The top and the side wall of the side limiting block 2021 are provided with movable gaps through the limiting groove 1011, so that the normal expansion margin of the bridge can be ensured, and the bridge internal stress is prevented from being increased due to the dead locking. Through the setting of the hinge mechanism that shifts, the corner of striding seam fly leaf 2 of being convenient for shifts, and the setting of magnet can the actuation second broach 201, avoids getting into the perk of bottom joint debris, has reduced the noise moreover.
In embodiment 3, as shown in fig. 5 and 6, an auxiliary limiting structure is added to the anti-falling beam expansion joint device of the present invention on the basis of embodiment 1, so as to form this embodiment. The middle of the second comb 201 is provided with a waist-shaped hole 204, the waist-shaped hole 204 is formed along the length direction of the second comb 201, a limit bolt 5 is arranged in the waist-shaped hole 204, the head of the limit bolt 5 is arranged in the waist-shaped hole 204, and the bottom of the limit bolt 5 is fixedly connected to a beam-end concrete material. The range of the expansion margin of the waist-shaped hole 204 is smaller than the range of the limit expansion margin of the comb teeth head, when the extreme conditions such as earthquake occur, the head of the limit bolt 5 firstly carries out limit blocking in the waist-shaped hole 204 to form buffering, and the effect is better when the beam is prevented from falling through the meshing of the comb teeth head. Obviously, the limit bolt 5 may also take the form of a limit stop pin, and similar structural changes fall within the scope of the present invention.
The first-stage limiting blocking formed by the waist-shaped holes 204 and the limiting bolts 5 is added, the comb teeth at the second stage are meshed to block, seismic wave impact is buffered in a two-stage mode, the damage probability of the expansion joint device is reduced, and the service life of the equipment is prolonged.
Specifically, as shown in fig. 5 and 6, the left end and the right end of the fixed plate 1 and the movable plate 2 are respectively provided with a projection and a groove structure which can be engaged with each other. The left and right ends of the plate 2 are respectively provided with a second projection 205 and a second groove 206. In the width direction of the bridge, two adjacent gap-spanning movable plates 2, the second protruding heads 205 and the second grooves 206 are engaged together, i.e. the whole width direction forms a connected whole. Similarly, the left end of the fixing plate 1 is provided with a first raised head 103, the right end of the fixing plate 1 is provided with a first groove, and the connecting structures of the adjacent fixing plates 1 are consistent. It is obvious that the cross section of the structure of the nose and the groove in the figures is rectangular and should not be understood as limiting the scope of the invention, and the cross section of the structure of the nose and the groove is triangular, trapezoidal or semicircular and the like, and similar modifications are possible within the scope of the invention.
Through the mutually meshed raised head and groove structures arranged between the adjacent seam crossing movable plates 2 or the adjacent fixed plates 1, all units in the whole width direction can be connected into a whole, the condition that the fixed plates 1 or the seam crossing movable plates 2 fall off singly under the limit condition is avoided, and the safety performance of the girder falling prevention expansion joint device is improved.
The invention also discloses a working method of the girder falling prevention expansion joint device, the girder falling prevention expansion joint device in any embodiment is used for preventing girder falling, and the comb teeth heads which are mutually meshed at the limit positions are used for preventing the girder end from separating.
Further through the height direction anti-drop structure that the spacing groove of side stopper cooperation formed, can further prevent that the roof beam end from receiving the roof beam that falls that the shake lifting caused.
According to the girder-falling-preventing expansion joint device, the first comb-tooth heads 102 and the second comb-tooth heads 202 are respectively arranged at the top end parts of the tooth comb plates, the width of each second comb-tooth head 202 is larger than the gap between every two adjacent first comb-tooth heads 102, and when the girder end separation distance is larger than the lap joint limit design distance of the expansion joint comb plate under the conditions of earthquakes and the like, the second comb-tooth heads 202 are clamped between every two adjacent first comb-tooth heads 102 and are mutually meshed to limit the girder end to continuously separate, so that the girder end is prevented from separating from a bridge pier. The beam falling prevention expansion joint device can limit the displacement of the beam end of the bridge during earthquake, the beam end can not be separated at the expansion joint, the beam falling of the beam end is prevented, and the safety performance is improved. In addition, through the first comb-tooth head 102 and the second comb-tooth head 202 which are symmetrically arranged and have rectangular shapes, the extending distances of the two sides are consistent, the consistency is good, the processing and the production are convenient, the stress of the two sides is even during occlusion, the local plastic deformation cannot be formed, and the service life is prolonged. Through the arrangement of the first tensile pin shaft 3 and the second tensile pin shaft 4, the connection strength of the fixed plate 1 and the seam crossing movable plate 2 with the beam end can be increased, and the situation that the fixed plate 1 or the seam crossing movable plate 2 falls off under the impact of seismic waves is avoided. The anti-slip lines 203 with the wave lines or the triangular sawtooth lines are arranged, so that the attractiveness of the anti-falling beam expansion joint device is improved, the anti-slip performance is improved, and the vehicle tire is prevented from impacting the comb teeth after slipping on the surface of a wet and slippery expansion joint. The side limiting block 2021 is matched with the limiting groove 1011 to form a height direction anti-falling structure, namely, under the limit conditions of an earthquake and the like, when the beam end below the seam crossing movable plate 2 is upward lifted by the earthquake, the side limiting block 2021 is limited in the limiting groove 1011, so that the seam crossing movable plate 2 is prevented from being continuously lifted and separated from the fixed plate 1 to cause the beam falling danger. The top and the side wall of the side limiting block 2021 are provided with movable gaps through the limiting groove 1011, so that the normal expansion margin of the bridge can be ensured, and the bridge internal stress is prevented from being increased due to the dead locking. Through the setting of the hinge mechanism that shifts, be convenient for stride the corner of seam fly leaf 2 and shift, the setting of magnet can the actuation stride seam fly leaf 2, avoids getting into the perk of bottom joint debris, has reduced the noise moreover. The first-stage limiting blocking formed by the waist-shaped holes 204 and the limiting bolts 5 is added, the comb teeth at the second stage are meshed to block, seismic wave impact is buffered in a two-stage mode, the damage probability of the expansion joint device is reduced, and the service life of the equipment is prolonged. Through the mutually meshed raised head and groove structures arranged between the adjacent seam crossing movable plates 2 or the adjacent fixed plates 1, all units in the whole width direction can be connected into a whole, the condition that the fixed plates 1 or the seam crossing movable plates 2 fall off singly under the limit condition is avoided, and the safety performance of the girder falling prevention expansion joint device is improved.
The invention relates to a working method of a girder-falling-preventing expansion joint device, which adopts comb teeth heads which are mutually meshed at limit positions to prevent girder ends from separating. Through the height direction anti-drop structure that the spacing groove of side stopper cooperation formed, can further prevent that the roof beam end from receiving the roof beam that falls that the lifting caused that shakes.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.
Claims (10)
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| CN202110754654.3A CN113699882A (en) | 2021-07-05 | 2021-07-05 | Anti-falling beam expansion joint device and working method thereof |
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| CN202110754654.3A CN113699882A (en) | 2021-07-05 | 2021-07-05 | Anti-falling beam expansion joint device and working method thereof |
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| CN207109574U (en) * | 2017-05-15 | 2018-03-16 | 天津桥通科技发展有限公司 | Comb-tooth-type bridge extension joint |
| CN108487060A (en) * | 2018-06-05 | 2018-09-04 | 吴昊 | A kind of highway bridge fishback telescopic device |
| CN110158457A (en) * | 2019-06-06 | 2019-08-23 | 桂迎生 | A kind of highway bridge fishback telescopic device |
| CN215366807U (en) * | 2021-07-05 | 2021-12-31 | 河北旭光橡胶制品有限公司 | Prevent roof beam expansion joint device that falls |
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