CN216108142U - Shearing-resistant reinforcing device for hollow plate girder - Google Patents
Shearing-resistant reinforcing device for hollow plate girder Download PDFInfo
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- CN216108142U CN216108142U CN202121755912.1U CN202121755912U CN216108142U CN 216108142 U CN216108142 U CN 216108142U CN 202121755912 U CN202121755912 U CN 202121755912U CN 216108142 U CN216108142 U CN 216108142U
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Abstract
The utility model provides a shear-resistant reinforcing device for a hollow plate beam. This hollow slab beam reinforcing apparatus that shears includes: the bridge comprises a bridge, wherein a sunken area is arranged at the upper end of the bridge; the bridge comprises a hollow plate beam, at least one through hole is arranged in a hinge joint of the hollow plate beam, and the through hole is communicated with the recessed area; the upper connecting piece is fixedly arranged in the concave area; the lower connecting piece is fixedly arranged at the lower end of the bridge; the opposite pull rod is arranged in the through hole, and two ends of the opposite pull rod are respectively and fixedly connected with the upper connecting piece and the lower connecting piece; and the repairing layer is filled in the concave area and covers the upper connecting piece. According to the utility model, the upper connecting piece, the lower connecting piece and the counter-pull rod form the reinforcing assembly, so that the transverse connection among the plate beams can be enhanced, the stress state of a single beam is weakened, and the vibration of the beam and the plate is avoided, thereby avoiding the cracking and discretization of the crack repairing adhesive.
Description
Technical Field
The utility model relates to a shear-resistant reinforcing device for a hollow plate beam.
Background
The vicinity of the bridge support mainly bears shear load. Especially for fabricated hollow slab girder bridges, the transverse distribution of the load at the beam end ranges is close to zero. Thus, the shear forces at the beam ends of the plate beams are substantially all carried by the single beam.
Hollow slab beams are limited in their construction and their small thickness at the web often results in insufficient shear capacity at the beam-end shear maxima. Particularly, when the large-span prestressed hollow slab beam is adopted, initial tension of a prestressed tendon is added at the beam end, so that the web plate in the beam end area is in a bending shear force superposition state, and an oblique shear crack is often generated in the web plate in the beam end area of the hollow slab beam. The crack of the web plate can lead to the shortening of the service life of the concrete member, and the structural safety of the concrete member is seriously influenced.
At present, few methods for reinforcing the beam end of the existing hollow plate beam by shearing resistance are used, and mortar is generally injected into a cavity by pressure, so that the shearing resistance of the hollow plate beam is enhanced by a method for improving the shearing resistance section. However, the cavity grouting method needs to remove the top of the plate beam and damages the original structure.
Therefore, a method or a device which has little influence on the original structure and can improve the shearing resistance of the beam end of the hollow plate beam is needed to be found.
SUMMERY OF THE UTILITY MODEL
One object of the present invention is to overcome at least one of the disadvantages of the prior art and to provide a shear reinforcement device for a hollow slab girder.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
according to a first aspect of the present invention, there is provided a hollow plate girder shear reinforcement device. This hollow slab beam reinforcing apparatus that shears includes:
the bridge comprises a bridge, wherein a concave area is arranged at the upper end of the bridge; the bridge comprises a hollow plate beam, at least one through hole is arranged in a hinge joint of the hollow plate beam, and the through hole is communicated with the recessed area;
the upper connecting piece is fixedly arranged in the concave area;
the lower connecting piece is fixedly arranged at the lower end of the bridge;
the opposite pull rod is arranged in the through hole, and two ends of the opposite pull rod are respectively and fixedly connected to the upper connecting piece and the lower connecting piece; and
and the repairing layer is filled in the depressed area and covers the upper connecting piece.
Optionally, the bridge further comprises a paving layer paved on the upper surface of the hollow slab beam;
the concave regions comprise a first concave region positioned in the pavement layer and a second concave region positioned in the hollow slab beam;
the upper connecting piece is anchored on the upper surface of the hollow slab beam, and part of the structure is located in the second concave area and is fixedly connected with the counter pull rod; the lower connecting piece is anchored on the lower surface of the hollow slab beam.
Optionally, the top surface of the upper connecting piece is concavely provided with a groove, and the groove extends into the second sunken area;
a first anchor backing plate is arranged on the bottom wall of the groove, and a first bolt hole is arranged on the first anchor backing plate and the bottom wall of the groove in a penetrating manner;
a second anchor backing plate is arranged on one side, back to the hollow plate beam, of the lower connecting piece, and a second bolt hole is formed in the lower connecting piece and the second anchor backing plate in a penetrating mode;
the axial direction of the first bolt hole, the axial direction of the through hole, and the axial direction of the second bolt hole are inclined at the same angle with respect to a vertical line;
the tie-rod is in a bolt structure and sequentially penetrates through the first bolt hole, the through hole and the second bolt hole, and the part of the tie-rod, which penetrates through the second bolt hole, is fastened with a nut.
Optionally, a fastening force F applied by the nut to the tie rod penetrating through the second bolt hole portion is not greater than P × 60%, where P is a breaking force of the tie rod.
Optionally, the axial direction of the first bolt hole is inclined at an angle θ of 45 ° to 60 ° with respect to the vertical.
Optionally, the minimum distance L2 between the starting end of the groove and the crack of the hollow slab beam in the length direction is more than or equal to 50 cm; and/or the presence of a gas in the gas,
the length of the groove is 10cm longer than that of the upper connecting piece; and/or the presence of a gas in the gas,
the width of the groove is 10cm more than that of the upper connecting piece.
Optionally, the paving layer comprises a concrete paving layer paved on the hollow slab beam and an asphalt paving layer paved on the concrete paving layer;
the recessed region is configured to: and forming after removing part of the paving layer and part of the hollow plate beam and exposing part of the upper surface of the hollow plate beam.
Optionally, the repair layer comprises a quick-hardening concrete mortar and asphalt concrete filled in the recessed area.
Optionally, the lengths L1 of the upper connecting piece and the lower connecting piece are equal, and the longest longitudinal distance of the crack region of the hollow slab beam is La, wherein L1 is more than or equal to La multiplied by 1.41.
Optionally, the through holes are drilled holes distributed in the middle of the hinge joint of the hollow slab beam.
Different from the prior art, in the shearing-resistant reinforcing device for the hollow plate girder, the upper end and the lower end of the hollow plate girder of the bridge are respectively and fixedly provided with the upper connecting piece and the lower connecting piece, and the two ends of the counter-pull rod are respectively and fixedly connected with the upper connecting piece and the lower connecting piece. The upper connecting piece, the lower connecting piece and the counter-pull rod form a reinforcing assembly, so that the transverse connection between the plate beams can be enhanced, the stress state of a single beam is weakened, and the vibration of the beam and the plate is avoided, so that the cracking and discretization of the crack repairing adhesive are avoided.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
Fig. 1 is a sectional view of a hollow slab beam shear reinforcement device provided in accordance with an embodiment of the present invention, taken along a plane in which the length and height directions thereof are located.
Fig. 2 is a sectional view of a plane in which the shear reinforcement device for the hollow slab girder of fig. 1 is located in width and height directions.
Fig. 3 is a top view of the upper connector of fig. 2.
Fig. 4 is an enlarged schematic view of the upper connector of fig. 1.
Fig. 5 is an enlarged schematic view of the lower connector of fig. 1.
Detailed Description
The utility model is described in detail below with reference to the attached drawing figures:
according to one aspect of the present invention, there is provided a shear reinforcing method for a hollow slab girder. Referring to fig. 1 and 2, the method for reinforcing a hollow slab beam includes the following steps:
first, a recessed area 12 is provided at the upper end of the bridge 1.
The bridge 1 comprises hollow slab beams 10. Hinge joints are formed in the hollow plate girders 10 of the bridge 1. At least one through-hole is provided in the hinge joint of the hollow plate girder 10, which through-hole communicates with the depressed area 12. In this embodiment, the hinge joint refers to post-cast concrete (pouring joint) between the prefabricated plate beams in the bridge 1 engineering, and the hinge joint connects the two plate beams and is performed before the bridge deck pavement construction after the plate beams are installed. For example, the bridge 1 is shown to have a longitudinal direction L, a height direction H, and a width direction W. The web of the hollow slab beam 10 in the beam end region is subjected to oblique shear cracks 14. In a plane formed by the length direction L and the height direction H of the bridge 1, the crack 14 has a longitudinal direction and a transverse direction, the longitudinal direction is the extending direction of the crack 14, and the transverse direction is perpendicular to the longitudinal direction.
Then, the upper connector 20 is fixedly disposed at the depressed region 12. The lower connecting piece 30 is fixedly arranged at the lower end of the bridge 1. In this way, the upper and lower ends of the hollow slab beam 10 of the bridge 1 are respectively fixedly provided with the upper and lower connecting members 20 and 30.
A tie rod 40 is disposed in the through hole. The opposite ends of the opposite pull rod 40 are fixedly connected to the upper and lower connectors 20 and 30, respectively.
Then, the bridge 1 is repaired in the depressed area of the upper end of the bridge 1, and the abutment (cap beam) 8 is installed at the end of the bridge.
In this embodiment, the bridge support 8 supports the bridge 1, and the abutment (cap beam) 8 is disposed at an end of the bridge 1. The upper and lower ends of the hollow slab beam 10 of the bridge 1 are respectively and fixedly provided with an upper connecting piece 20 and a lower connecting piece 30, and the two ends of the opposite pull rod 40 are respectively and fixedly connected with the upper connecting piece 20 and the lower connecting piece 30. The upper connecting piece 20, the lower connecting piece 30 and the counter-pull rod 40 form a reinforcing assembly, so that the transverse connection among the hollow plate beams 10 can be enhanced, the stress state of the single beam is weakened, the vibration of the beam and the plate is avoided, and the cracking and discretization of the crack 14 repairing glue are avoided.
In this embodiment, referring to fig. 1 to 3, a bridge 1 includes a hollow slab beam 10 and a pavement layer laid on the hollow slab beam 10. When the upper end of the bridge 1 is provided with the sunken area 12, a part of the pavement layer and a part of the hollow plate girder 10 at the upper end of the bridge 1 are removed, and the surface of the part of the hollow plate girder 10 is exposed. The recessed region 12 includes a first recessed region 120 in the pavement and a second recessed region 122 in the hollow slab beam 10. The exposed part of the surface of the hollow plate girder 10 may be disposed around the second recess region 122. The second recessed region 122 communicates with the through-hole.
The upper connecting member 20 may be anchored to the upper surface of the hollow plate girder 10 by a high-strength anchor bolt 50, and a part of the structure of the upper connecting member 20 is located in the second recess region 122 and is fixedly connected to the counter-pull rod 40. The lower connecting member 30 may be anchored to the lower surface of the hollow plate girder 10 by means of high-strength anchors 50.
Further, referring to fig. 2 and 3, the upper connecting member 20 is recessed with a groove 22 on the top surface. The groove 22 extends into the second recessed region 122. For example, the groove 22 may be provided at a middle position of the top surface of the upper connecting member 20. The bottom wall 224 of the groove 22 can be provided with a first anchor pad 24, and the first anchor pad 24 and the bottom wall 224 of the groove 22 are provided with a first bolt hole in a penetrating way.
The side of the lower connecting member 30 facing away from the hollow slab beam 10 may be provided with a second anchor pad 34. The lower connecting member 30 and the second anchor pad 34 are provided with second bolt holes therethrough.
Referring to fig. 1, 4 and 5, the axial direction of the first bolt hole, the axial direction of the through hole and the axial direction of the second bolt hole are inclined at the same angle with respect to the vertical line. Wherein the vertical line extends in the length direction L of the bridge 1.
The tie rod 40 is correspondingly arranged in a bolt structure. The tie rod 40 is inserted into the through hole from the first bolt hole. The tie rod 40 passes through the first bolt hole, the through hole and the second bolt hole in sequence, and part of the tie rod passes through the second bolt hole. And fastening the part of the pull rod 40 which penetrates out of the second bolt hole with a nut.
Correspondingly, the first anchor backing plate 24 and the second anchor backing plate 34 can be inclined at the same angle relative to the vertical line and are respectively in contact connection with the tie-rod 40 from the two axial ends so as to limit the axial position of the tie-rod 40 and realize the transverse reinforcing effect of the tie-rod 40 on the hollow slab beam 10.
Preferably, as shown in the figure, a nut is screwed with the second bolt hole portion through which the counter rod 40 penetrates, and the nut applies a fastening force F to the counter rod 40 penetrating the second bolt hole portion. The breaking force on the tie rod 40 is P. Wherein: f is less than or equal to P multiplied by 60 percent.
Preferably, as shown in the drawing, the axial direction of the first bolt hole may be set at an inclination angle θ of 45 ° to 60 ° with respect to the vertical line.
Preferably, as shown in the figure, the starting end of the groove 22 is at a minimum distance L from the slit 14 of the hollow slab beam 10 in the length direction L2≥50cm。
Preferably, as shown, the length of the groove 22 in the length direction L is 10cm more than the length of the upper link 20.
Preferably, as shown in the drawing, the width of the groove 22 is 10cm more than the width of the upper link 20 in the width direction W.
Preferably, the length L of the upper and lower connectors 20 and 30 is as shown1The longitudinal longest distance in the region of the crack 14 of the hollow plate girder 10, which may be equally arranged, is La. Wherein: l is1≥La×1.41。
Preferably, as shown in the drawings, the through holes are distributed in the middle of the hinge joints of the hollow slab girder 10 and drilled by a drilling apparatus.
Preferably, as shown in the drawings, the pavement may include a concrete pavement 16 laid on the hollow slab girder 10 and an asphalt pavement 18 laid on the concrete pavement 16. In repairing the depressed area 12, a quick-hardening concrete mortar and an asphalt concrete are filled in the depressed area 12.
Further, as shown, after repairing the recessed area 12, the bottom of the hinge joint may be closed. And then injecting glue.
According to the same inventive concept, the utility model also provides a shear-resisting reinforcing device for the hollow plate girder. Referring to fig. 1 and 2, the shear reinforcement device for a hollow slab girder includes a bridge girder 1, an upper connector 20, a lower connector 30, tie rods 40, and a repair layer. The bridge support 8 supports the bridge 1, and the abutment (capping beam) 8 is arranged at the end part of the bridge 1.
A recessed area 12 is provided at the upper end of the bridge 1. The bridge 1 comprises hollow slab beams 10. At least one through hole is provided in the hinge joint of the hollow plate girder 10, and the through hole communicates with the depressed area 12. In this embodiment, the hinge joint refers to post-cast concrete (crack pouring) between prefabricated plate beams in bridge engineering, and is used for connecting two plate beams before bridge deck pavement construction after the plate beams are installed. For example, the bridge 1 is shown to have a longitudinal direction L, a height direction H, and a width direction W. The web of the hollow slab beam 10 in the beam end region is subjected to oblique shear cracks 14. In a plane formed by the length direction L and the height direction H of the bridge 1, the crack 14 has a longitudinal direction and a transverse direction, the longitudinal direction is the extending direction of the crack 14, and the transverse direction is perpendicular to the longitudinal direction.
The upper connector 20 is fixedly disposed in the recessed area 12. The lower connecting member 30 is fixedly disposed at the lower end of the bridge 1. The tie-rod 40 is disposed in the through-hole. The opposite ends of the opposite pull rod 40 are fixedly connected to the upper and lower connectors 20 and 30, respectively. The repair layer is filled in the recess 12 and covers the upper connecting member 20.
In this embodiment, the upper and lower ends of the hollow slab beam 10 of the bridge 1 are respectively and fixedly provided with an upper connecting member 20 and a lower connecting member 30, and the two ends of the tie rod 40 are respectively and fixedly connected to the upper connecting member 20 and the lower connecting member 30. The upper connecting piece 20, the lower connecting piece 30 and the counter-pull rod 40 form a reinforcing assembly, so that the transverse connection among the hollow plate beams 10 can be enhanced, the stress state of the single beam is weakened, the vibration of the beam and the plate is avoided, and the cracking and discretization of the crack 14 repairing glue are avoided.
In this embodiment, referring to fig. 1 to 3, the bridge 1 further includes a paving layer laid on the hollow slab beam 10. When the upper end of the bridge 1 is provided with the sunken area 12, a part of the pavement layer and a part of the hollow plate girder 10 at the upper end of the bridge 1 are removed, and the surface of the part of the hollow plate girder 10 is exposed. The recessed region 12 includes a first recessed region 120 in the pavement and a second recessed region 122 in the hollow slab beam 10. The exposed part of the surface of the hollow plate girder 10 may be disposed around the second recess region 122. The second recessed region 122 communicates with the through-hole.
The upper connecting member 20 may be anchored to the upper surface of the hollow plate girder 10 by a high-strength anchor bolt 50, and a part of the structure of the upper connecting member 20 is located in the second recess region 122 and is fixedly connected to the counter-pull rod 40. The lower connecting member 30 may be anchored to the lower surface of the hollow plate girder 10 by means of high-strength anchors 50.
Further, referring to fig. 2 and 3, the upper connecting member 20 is recessed with a groove 22 on the top surface. The groove 22 extends into the second recessed region 122. For example, the groove 22 may be provided at a middle position of the top surface of the upper connecting member 20. The bottom wall 224 of the groove 22 can be provided with a first anchor pad 24, and the first anchor pad 24 and the bottom wall 224 of the groove 22 are provided with a first bolt hole in a penetrating way.
The side of the lower connecting member 30 facing away from the hollow slab beam 10 may be provided with a second anchor pad 34. The lower connecting member 30 and the second anchor pad 34 are provided with second bolt holes therethrough.
Referring to fig. 1, 4 and 5, the axial direction of the first bolt hole, the axial direction of the through hole and the axial direction of the second bolt hole are inclined at the same angle with respect to the vertical line. Wherein the vertical line extends in the length direction L of the bridge 1.
The tie rod 40 is correspondingly arranged in a bolt structure. The tie rod 40 can be threaded into the through hole from the first bolt hole. The tie rod 40 passes through the first bolt hole, the through hole and the second bolt hole in sequence, and part of the tie rod passes through the second bolt hole. And fastening the part of the pull rod 40 which penetrates out of the second bolt hole with a nut.
Correspondingly, the first anchor backing plate 24 and the second anchor backing plate 34 can be inclined at the same angle relative to the vertical line and are respectively in contact connection with the tie-rod 40 from the two axial ends so as to limit the axial position of the tie-rod 40 and realize the transverse reinforcing effect of the tie-rod 40 on the hollow slab beam 10.
Preferably, as shown, a nut is threadedly coupled to the tie rod 40 through the second bolt hole portion. By arranging the matching structure between the nut and the second bolt hole part through which the counter pull rod 40 penetrates, the fastening force F exerted by the nut on the second bolt hole part through which the counter pull rod 40 penetrates is less than or equal to Px 60%. Where P is the breaking force on the tie rod 40.
Preferably, as shown in the drawing, the axial direction of the first bolt hole may be set at an inclination angle θ of 45 ° to 60 ° with respect to the vertical line.
Preferably, as shown in the drawing, the axial direction of the first bolt hole may be set at an inclination angle θ of 45 ° to 60 ° with respect to the vertical line.
Preferably, as shown in the figure, the starting end of the groove 22 is at a minimum distance L from the slit 14 of the hollow slab beam 10 in the length direction L2≥50cm。
Preferably, as shown, the length of the groove 22 in the length direction L is 10cm more than the length of the upper link 20.
Preferably, as shown in the drawings, the pavement may include a concrete pavement 16 laid on the hollow slab girder 10 and an asphalt pavement 18 laid on the concrete pavement 16. After removing a part of the pavement and a part of the hollow slab beam 10 and exposing a part of the upper surface of the hollow slab beam 10, the concave region 12 is formed.
Preferably, as shown, the repair layer may comprise quick-setting concrete mortar and asphalt concrete filled in the recessed area 12. And injecting glue in the repairing layer for reinforcement.
Preferably, the length L of the upper and lower connectors 20 and 30 is as shown1The longitudinal longest distance in the region of the crack 14 of the hollow plate girder 10, which may be equally arranged, is La. Wherein: l is1≥La×1.41。
Preferably, as shown in the figure, the through holes may be drilled holes distributed in the middle of the hinge joints of the hollow slab girder 10.
In the utility model, the upper end and the lower end of the hollow plate beam of the bridge are respectively and fixedly provided with an upper connecting piece and a lower connecting piece, and the two ends of the counter-pull rod are respectively and fixedly connected with the upper connecting piece and the lower connecting piece. The upper connecting piece, the lower connecting piece and the counter-pull rod form a reinforcing assembly, so that the transverse connection between the plate beams can be enhanced, the stress state of a single beam is weakened, and the vibration of the beam and the plate is avoided, so that the cracking and discretization of the crack repairing adhesive are avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (10)
1. A shear reinforcement device for a hollow slab beam, comprising:
the bridge comprises a bridge, wherein a concave area is arranged at the upper end of the bridge; the bridge comprises a hollow plate beam, at least one through hole is arranged in a hinge joint of the hollow plate beam, and the through hole is communicated with the recessed area;
the upper connecting piece is fixedly arranged in the concave area;
the lower connecting piece is fixedly arranged at the lower end of the bridge;
the opposite pull rod is arranged in the through hole, and two ends of the opposite pull rod are respectively and fixedly connected to the upper connecting piece and the lower connecting piece; and
and the repairing layer is filled in the depressed area and covers the upper connecting piece.
2. The shear reinforcement device for a hollow plate beam according to claim 1, wherein:
the bridge also comprises a paving layer paved on the upper surface of the hollow slab beam;
the concave regions comprise a first concave region positioned in the pavement layer and a second concave region positioned in the hollow slab beam;
the upper connecting piece is anchored on the upper surface of the hollow slab beam, and part of the structure is located in the second concave area and is fixedly connected with the counter pull rod; the lower connecting piece is anchored on the lower surface of the hollow slab beam.
3. The shear reinforcement device for a hollow plate beam according to claim 2, wherein:
the top surface of the upper connecting piece is concavely provided with a groove, and the groove extends into the second sunken area; a first anchor backing plate is arranged on the bottom wall of the groove, and a first bolt hole is arranged on the first anchor backing plate and the bottom wall of the groove in a penetrating manner;
a second anchor backing plate is arranged on one side, back to the hollow plate beam, of the lower connecting piece, and a second bolt hole is formed in the lower connecting piece and the second anchor backing plate in a penetrating mode;
the axial direction of the first bolt hole, the axial direction of the through hole, and the axial direction of the second bolt hole are inclined at the same angle with respect to a vertical line;
the tie-rod is in a bolt structure and sequentially penetrates through the first bolt hole, the through hole and the second bolt hole, and the part of the tie-rod, which penetrates through the second bolt hole, is fastened with a nut.
4. The shear reinforcement device for a hollow plate beam according to claim 3, wherein:
and the fastening force F applied by the nut to the pull rod penetrating through the second bolt hole part is not more than P x 60 percent, wherein P is the breaking force of the pull rod.
5. The shear reinforcement device for a hollow plate beam according to claim 3, wherein:
the axial direction of the first bolt hole is inclined at an angle theta of 45-60 degrees relative to the vertical line.
6. The shear reinforcement device for a hollow plate beam according to claim 3, wherein:
the minimum distance L between the starting end of the groove and the crack of the hollow slab beam in the length direction2≥50cm；
And/or the presence of a gas in the gas,
the length of the groove is 10cm longer than that of the upper connecting piece; and/or the presence of a gas in the gas,
the width of the groove is 10cm more than that of the upper connecting piece.
7. The shear reinforcement device for a hollow plate beam according to claim 2, wherein:
the paving layer comprises a concrete paving layer paved on the hollow slab beam and an asphalt paving layer paved on the concrete paving layer;
the recessed region is configured to: and forming after removing part of the paving layer and part of the hollow plate beam and exposing part of the upper surface of the hollow plate beam.
8. The shear reinforcement device for a hollow plate beam according to claim 7, wherein:
the repair layer comprises quick-hardening concrete mortar and asphalt concrete filled in the sunken area.
9. The shear reinforcement device for a hollow plate beam according to claim 1, wherein:
length L of the upper and lower connecting members1And the longest longitudinal distance of the crack area of the hollow plate beam is La, wherein L1≥La×1.41。
10. The shear reinforcement device for a hollow plate beam according to claim 1, wherein:
the through holes are drilled holes distributed in the middle of the hinge joint of the hollow slab beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121755912.1U CN216108142U (en) | 2021-07-29 | 2021-07-29 | Shearing-resistant reinforcing device for hollow plate girder |
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|---|---|---|---|
| CN202121755912.1U CN216108142U (en) | 2021-07-29 | 2021-07-29 | Shearing-resistant reinforcing device for hollow plate girder |
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| CN216108142U true CN216108142U (en) | 2022-03-22 |
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