CN117513262A - Tunnel surrounding rock supporting method and supporting structure - Google Patents
Tunnel surrounding rock supporting method and supporting structure Download PDFInfo
- Publication number
- CN117513262A CN117513262A CN202311438649.7A CN202311438649A CN117513262A CN 117513262 A CN117513262 A CN 117513262A CN 202311438649 A CN202311438649 A CN 202311438649A CN 117513262 A CN117513262 A CN 117513262A
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- sliding
- tunnel
- plates
- surrounding rock
- support
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel surrounding rock support, in particular to a tunnel surrounding rock support method and a support structure. According to the invention, after the central points of the mounting plate and the top end of the tunnel are kept consistent, the driving assembly can drive the sliding plate to move to two sides, so that the sliding plate can move to a construction appointed position, and the problem that support cannot be mounted in an adaptive manner due to the fact that two ends of the tunnel are asymmetric due to construction reasons can be avoided.
Description
Technical Field
The invention relates to the technical field of tunnel surrounding rock support, in particular to a tunnel surrounding rock support method and a tunnel surrounding rock support structure.
Background
In the construction process of nuclear industry, large hydraulic engineering is needed, wherein the natural environment needs to be changed greatly, in the hydraulic engineering, for water delivery or flood discharge, a closed water delivery channel is built by digging through a mountain, which is called a hydraulic tunnel, and the hydraulic tunnel can be divided into a water discharge tunnel and a water discharge tunnel according to different tasks, wherein the water discharge tunnel can be used for the wastewater discharge operation of the nuclear industry.
The tunnel encloses rock support among the prior art and all is fixed the setting, can't order about the tunnel and encloses rock support and remove, and the tunnel encloses rock support and be assembled through the support that quantity is numerous and form, needs the staff to enclose rock support to assemble the tunnel based on the tunnel specification for staff work efficiency is low, and because the equipment time is longer, makes the staff assemble the rock that very easily dropped by just digging in the tunnel and smash, has the potential safety hazard.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, workers are required to assemble a tunnel surrounding rock support based on tunnel specifications, the working efficiency is low, and potential safety hazards exist in the assembling process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, a method of supporting a surrounding rock of a tunnel, the method comprising the steps of:
step S1, locating a center point, and measuring the center point of the top end of the tunnel by a measuring tool to determine the center position of the tunnel;
s2, switching the supporting structure into a moving mode, rotating the rotating plate, driving the worm to rotate, enabling the worm to drive the worm wheel to rotate, enabling the worm wheel to drive the rotating shaft to rotate, enabling the rotating shaft to drive the driving gear to rotate, enabling the driving gear to drive the driven rack to vertically move down, enabling the driven rack to drive the limiting sliding block to vertically move down in the limiting sliding groove, enabling the driven rack to drive the idler wheel to vertically move down, enabling the idler wheel to support the supporting structure to be separated from the ground, and enabling the supporting structure to move through arrangement of the idler wheel;
step S3, pushing the supporting structure into the tunnel, and ensuring that the center point of the mounting plate is consistent with the center point of the top end of the tunnel through a professional measuring tool;
step S4, rotating a handle to drive the ball screw to rotate, wherein the ball screw drives two nuts to horizontally move towards the inner end, the nuts drive the traction rod to deflect, the two sliding plates are pulled by the traction rod to horizontally move towards the outer side by using the position difference generated by the deflection of the traction rod, the sliding plates drive the guide sliding blocks to horizontally move in the guide sliding grooves, and the two sliding plates drive the two support guard plates to horizontally move towards the outer side, so that the support guard plates move to the construction designated position;
s5, installing the arc-shaped support in the containing chute in a sliding manner, aligning the arc-shaped support with the threaded holes on the support guard plate, and fixing the arc-shaped support and the support guard plate through the threaded holes in a bolt manner;
and S6, an operator presets Kong Chuancha steel bars and anchor rods, then casts concrete, and mixes early strength agents into the concrete, so that the concrete can be ensured not to crack after being bonded by the steel bars and the anchor rods.
The second aspect is a tunnel surrounding rock supporting structure applied to the tunnel surrounding rock supporting method, wherein the supporting structure comprises a mounting plate, and two sliding plates are sleeved on the mounting plate in a sliding manner;
the mounting plate is internally provided with a driving component for driving the sliding plate to horizontally move towards two ends;
the outer ends of the two sliding plates are fixedly connected with support guard plates which are movably propped against the inner wall of the surrounding rock of the tunnel, the upper ends of the two support guard plates are slidably provided with arc-shaped brackets which are movably propped against the top end of the surrounding rock of the tunnel, threaded holes for fixing bolts of the support guard plates and the arc-shaped brackets are formed in the support guard plates and the arc-shaped brackets, and preset holes for operators to penetrate through reinforcing steel bars and anchor rods are formed in the support guard plates and the arc-shaped brackets;
the lower end of the sliding plate is provided with a telescopic moving assembly.
Preferably, the guide sliding grooves are formed in two sides of the mounting plate, the guide sliding blocks fixedly connected with the inner sides of the sliding plates are sleeved in the guide sliding grooves in a sliding mode, the mounting plate is of a plate body structure with two openings, the sliding plates are of plate body structures with inner openings, and the mounting plate and the sliding plates are of hollow structures.
Preferably, two the storage chute that is used for slip-on arc support is all offered to support backplate upper end, arc support comprises the arc that corresponds the setting with the tunnel top, the first extension board that keeps unanimous with support backplate width and the second extension board that corresponds the setting with storage chute.
Preferably, the driving assembly comprises a ball screw which is rotatably arranged on the inner wall of one end of the mounting plate through a damping bearing and extends out of the other end of the mounting plate, two nuts are mounted on the ball screw in a matched mode, and four traction rods are connected between the two nuts and the two sliding plates through pin shafts.
Preferably, one end of the ball screw extending out of the mounting plate is fixedly connected with a handle made of frosted materials, and the ball screw is a bidirectional thread.
Preferably, the moving assembly comprises four storage grooves which are formed in the supporting guard plate, four grooves which are formed in the outer wall of the supporting guard plate and correspond to the storage grooves are formed in the outer wall of the supporting guard plate, a worm and a rotating shaft are rotatably arranged in the storage grooves through damping bearings, and one end of the worm extends into the grooves;
the storage groove is connected with a driven rack in a sliding manner, a worm wheel and a driving gear are fixedly sleeved on the rotating shaft, the worm wheel is connected with a worm in a meshed manner, the driving gear is connected with the driven rack in a meshed manner, and a roller is fixedly connected to the lower end of the driven rack.
Preferably, one end of the worm in the groove is fixedly sleeved with a rotating plate, the sum of the width of the rotating plate and the length of one end of the worm in the groove is smaller than the groove depth of the groove, the worm is positioned at the upper end of the rotating shaft, and the worm and the rotating shaft are distributed in a cross shape.
Preferably, a limiting sliding groove is formed in the storage groove, and a limiting sliding block fixedly connected with the driven rack is sleeved in the limiting sliding groove in a sliding mode.
Compared with the prior art, the invention has the following advantages:
after the central points of the mounting plate and the top end of the tunnel are kept consistent, the driving assembly can drive the sliding plate to move to two sides, so that the sliding plate can move to a construction designated position, and the problem that support cannot be mounted in an adaptive mode due to the fact that two ends of the tunnel are asymmetric due to construction can be avoided;
compared with the prior art, the assembled structure of the surrounding rock support of the tunnel has the advantages that the assembling work can be completed only by sliding and installing the support guard plate and the arc-shaped support and fixing the support guard plate and the arc-shaped support through the bolts, the working efficiency of workers is improved, the time of the workers in the tunnel is shortened, and the construction risk required to be born by the workers is reduced.
3. According to the invention, through the moving assembly, the mode of the tunnel surrounding rock support can be changed, so that the tunnel surrounding rock support can be moved, the flexibility of the tunnel surrounding rock support is improved, and a worker does not need to carry the tunnel surrounding rock support;
4. compared with the prior art, the fixed arrangement of the tunnel surrounding rock support leads to the fact that the tunnel surrounding rock support needs to be carried manually, time and labor are wasted, the tunnel surrounding rock support can be moved through the rollers through the moving assembly, and labor intensity of workers is relieved.
Drawings
FIG. 1 is a schematic structural view of a method and a structure for supporting surrounding rock of a tunnel according to the present invention;
FIG. 2 is a top view of FIG. 1 illustrating a method and structure for supporting surrounding rock of a tunnel according to the present invention;
FIG. 3 is an upper cross-sectional view of FIG. 1 of a tunnel surrounding rock supporting method and supporting structure according to the present invention;
FIG. 4 is a front view of the tunnel surrounding rock supporting method and supporting structure in FIG. 3 according to the present invention;
FIG. 5 is a partial cross-sectional view of FIG. 1 of a tunnel surrounding rock support method and structure in accordance with the present invention;
fig. 6 is a lower view of fig. 5 of the tunnel surrounding rock supporting method and the supporting structure according to the present invention.
In the figure: 1. a mounting plate; 2. a sliding plate; 3. supporting a guard board; 4. an arc-shaped bracket; 5. a threaded hole; 6. presetting a hole; 7. a ball screw; 8. a nut; 9. a traction rod; 10. a storage groove; 11. a groove; 12. a worm; 13. a rotating shaft; 14. a driven rack; 15. a worm wheel; 16. a drive gear; 17. and a roller.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1 to 6, a method and a structure for supporting surrounding rock of a tunnel, the method comprising the steps of:
step S1, locating a center point, and measuring the center point of the top end of the tunnel by a measuring tool to determine the center position of the tunnel;
step S2, switching the supporting structure into a moving mode, rotating the rotating plate, driving the worm 12 to rotate, driving the worm wheel 15 to rotate by the worm 12, driving the rotating shaft 13 to rotate by the worm wheel 15, driving the driving gear 16 by the rotating shaft 13, driving the driven rack 14 to vertically move down by the driving gear 16, driving the limit sliding block to vertically move down in the limit sliding groove by the driven rack 14, driving the roller 17 to vertically move down by the driven rack 14, supporting the supporting structure by the roller 17 to be separated from the ground, and enabling the supporting structure to move by the arrangement of the roller 17;
step S3, pushing the supporting structure into the tunnel, and ensuring that the center point of the mounting plate 1 and the center point of the top end of the tunnel can be kept consistent through a professional measuring tool;
step S4, rotating a handle to drive the ball screw 7 to rotate, wherein the ball screw 7 drives the two nuts 8 to horizontally move towards the inner ends, the nuts 8 drive the traction rods 9 to deflect, the two sliding plates 2 are pulled to horizontally move towards the outer sides by the traction rods 9 by utilizing the position difference generated by the deflection of the traction rods 9, the sliding plates 2 drive the guide sliding blocks to horizontally move in the guide sliding grooves, and the two sliding plates 2 drive the two support guard plates 3 to horizontally move towards the outer sides, so that the support guard plates 3 move to a construction designated position;
s5, installing the arc-shaped support 4 into the containing chute in a sliding manner, aligning the arc-shaped support 4 with the threaded holes 5 on the support guard plate 3, and fixing the arc-shaped support 4 and the support guard plate 3 through the threaded holes 5 in a bolt manner;
and S6, operators insert reinforcing steel bars and anchor rods through the preset holes 6, then, concrete is poured, early strength agents are doped in the concrete, and the reinforcing steel bars and the anchor rods can be utilized to ensure that the concrete cannot crack after being bonded.
The support structure comprises a mounting plate 1, wherein the mounting plate 1 is of a plate body structure with openings at two sides, two sliding plates 2 are sleeved on the mounting plate 1 in a sliding manner, guide sliding grooves are formed in two sides of the mounting plate 1, guide sliding blocks fixedly connected with the inner sides of the sliding plates 2 are sleeved in the guide sliding grooves in a sliding manner, the sliding plates 2 are of plate body structures with openings at the inner sides, the mounting plate 1 and the sliding plates 2 are of hollow structures, the movement track of the sliding plates 2 can be limited through the guide sliding blocks and the guide sliding grooves, and the horizontal movement of the sliding plates 2 is guided and supported;
the mounting plate 1 is internally provided with a driving component for driving the sliding plates 2 to horizontally move towards two ends, and the driving component drives the two sliding plates 2 to horizontally move, so that the sliding plates 2 can rapidly move to a designated construction position, and the working efficiency of operators is improved;
further description: the driving assembly comprises a ball screw 7 which is arranged on the inner wall of one end of the mounting plate 1 through a damping bearing in a rotating way and extends out of the other end of the mounting plate 1, one end of the ball screw 7 extending out of the mounting plate 1 is fixedly connected with a handle made of frosted materials, the ball screw 7 is a bidirectional thread, the comfort level of workers can be improved through the handle, two nuts 8 are arranged on the ball screw 7 in a matched way, and four traction rods 9 are connected between the two nuts 8 and the two sliding plates 2 through pin shafts;
the outer ends of the two sliding plates 2 are fixedly connected with support guard plates 3 which are movably propped against the inner wall of the surrounding rock of the tunnel, the upper ends of the two support guard plates 3 are slidably provided with arc-shaped supports 4 which are movably propped against the top end of the surrounding rock of the tunnel, the upper ends of the two support guard plates 3 are provided with storage sliding grooves for slidably sleeving the arc-shaped supports 4, the arc-shaped supports 4 consist of arc-shaped plates which are correspondingly arranged on the top end of the tunnel, first support plates which are consistent with the width of the support guard plates 3 and second support plates which are correspondingly arranged on the storage sliding grooves, and the assembly operation can be completed through the support guard plates 3 and the arc-shaped supports 4, so that workers do not need to assemble various support parts, and the complexity of the assembly of the support parts by the workers is reduced;
screw holes 5 for fixing the support guard plate 3 and the arc-shaped bracket 4 are formed in the support guard plate 3 and the arc-shaped bracket 4, and an operator can conveniently fix the support guard plate 3 and the arc-shaped bracket 4 through the screw holes 5;
the support guard plate 3 and the arc-shaped support 4 are provided with preset holes 6 for operators to insert reinforcing steel bars and anchor rods, installation space can be provided for the operators to insert the reinforcing steel bars and the anchor rods through the preset holes 6, concrete falling caused by cracking of the reinforcing steel bars and the anchor rods can be avoided, safety of tunnels is improved, the preset holes 6 are determined by adopting specific dimension specifications and number according to actual specifications and the like of the structure, and a specific model selection calculation method adopts the prior art in the field, so that the method is not repeated;
the lower end of the sliding plate 2 is provided with a telescopic moving assembly, and the tunnel surrounding rock support can be pushed by a worker through the roller 17 in the moving assembly, so that the worker does not need to carry the assembly parts forming the lower end of the tunnel surrounding rock support, and the labor intensity of the worker is reduced;
it should be noted that: the moving assembly comprises four containing grooves 10 which are formed in the support guard plate 3, and four grooves 11 which are formed in the outer wall of the support guard plate 3 and correspond to the containing grooves 10 are formed in the outer wall of the support guard plate;
the accommodating groove 10 is rotatably provided with a worm 12 and a rotating shaft 13 through a damping bearing, one end of the worm 12 extends into the groove 11, one end of the worm 12 positioned in the groove 11 is fixedly sleeved with a rotating plate, and the sum of the width of the rotating plate and the length of one end of the worm 12 positioned in the groove 11 is smaller than the groove depth of the groove 11, so that gaps are avoided when two adjacent support guard plates 3 are in butt joint, the worm 12 is positioned at the upper end of the rotating shaft 13, and the worm 12 and the rotating shaft 13 are distributed in a cross shape;
the storage groove 10 is connected with a driven rack 14 in a sliding way, a limiting chute is formed in the storage groove 10, and a limiting slider fixedly connected with the driven rack 14 is sleeved in the limiting chute in a sliding way;
the worm wheel 15 and the driving gear 16 are fixedly sleeved on the rotating shaft 13, the worm wheel 15 is in meshed connection with the worm 12, the worm 12 and the worm wheel 15 have self-locking performance, and when the lead angle of the worm 12 is smaller than the equivalent friction angle between meshing wheel teeth, reverse self-locking can be realized, namely, only the worm wheel 15 can be driven by the worm 12, but the worm wheel 15 cannot drive the worm 12, so that the bearing performance of the moving assembly is ensured;
the driving gear 16 is in meshed connection with the driven rack 14, and the vertical movement of the driven rack 14 can be guided and supported through the limiting sliding groove and the limiting sliding block, so that the driven rack 14 can be always in meshed connection with the driving gear 16, and the roller 17 is fixedly connected to the lower end of the driven rack 14.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A method of supporting surrounding rock of a tunnel, the method comprising the steps of:
step S1, locating a center point, and measuring the center point of the top end of the tunnel by a measuring tool to determine the center position of the tunnel;
step S2, switching the supporting structure into a moving mode, rotating the rotating plate to drive the worm (12) to rotate, enabling the worm (12) to drive the worm wheel (15) to rotate, enabling the worm wheel (15) to drive the rotating shaft (13) to rotate, enabling the rotating shaft (13) to drive the driving gear (16) to rotate, enabling the driving gear (16) to drive the driven rack (14) to vertically move down, enabling the driven rack (14) to drive the limit sliding block to vertically move down in the limit sliding groove, enabling the driven rack (14) to drive the roller (17) to vertically move down, enabling the supporting structure to be separated from the ground through the roller (17), and enabling the supporting structure to move through the arrangement of the roller (17);
step S3, pushing the supporting structure into the tunnel, and ensuring that the center point of the mounting plate (1) and the center point of the top end of the tunnel can be kept consistent through a professional measuring tool;
s4, rotating a handle to drive the ball screw (7) to rotate, wherein the ball screw (7) drives the two nuts (8) to horizontally move towards the inner end, the nuts (8) drive the traction rod (9) to deflect, the two sliding plates (2) are driven by the traction rod (9) to horizontally move towards the outer side by utilizing the position difference generated by the deflection of the traction rod (9), the sliding plates (2) drive the guide sliding blocks to horizontally move in the guide sliding grooves, and the two sliding plates (2) drive the two support guard plates (3) to horizontally move towards the outer side, so that the support guard plates (3) move to a construction designated position;
s5, installing the arc-shaped support (4) in a storage chute in a sliding manner, aligning the arc-shaped support (4) with a threaded hole (5) on the support guard plate (3), and fixing the arc-shaped support (4) and the support guard plate (3) through the threaded hole (5) by bolts;
and S6, an operator inserts the reinforcing steel bars and the anchor rods through the preset holes (6), then the concrete is poured, and an early strength agent is doped in the concrete, so that the reinforcing steel bars and the anchor rods can be used for ensuring that the concrete cannot crack after being bonded.
2. A tunnel surrounding rock supporting structure applied to the tunnel surrounding rock supporting method of claim 1, which is characterized in that the supporting structure comprises a mounting plate (1), and two sliding plates (2) are sleeved on the mounting plate (1) in a sliding manner;
the mounting plate (1) is internally provided with a driving component for driving the sliding plate (2) to horizontally move towards two ends;
the outer ends of the two sliding plates (2) are fixedly connected with support guard plates (3) which are movably propped against the inner wall of the surrounding rock of the tunnel, the upper ends of the two support guard plates (3) are slidably provided with arc supports (4) which are movably propped against the top end of the surrounding rock of the tunnel, threaded holes (5) for fixing bolts of the support guard plates (3) and the arc supports (4) are formed in the support guard plates (3) and the arc supports (4), and preset holes (6) for operators to penetrate through reinforcing steel bars and anchor rods are formed in the support guard plates (3) and the arc supports (4);
the lower end of the sliding plate (2) is provided with a telescopic moving assembly.
3. The tunnel surrounding rock supporting structure according to claim 2, wherein guide sliding grooves are formed in two sides of the mounting plate (1), guide sliding blocks fixedly connected with the inner sides of the sliding plates (2) are sleeved in the guide sliding grooves in a sliding mode, the mounting plate (1) is of a plate body structure with two open sides, the sliding plates (2) are of plate body structures with inner sides open, and the mounting plate (1) and the sliding plates (2) are of hollow structures.
4. The tunnel surrounding rock supporting structure according to claim 2, wherein the two support guard plates (3) are provided with storage sliding grooves for sliding sleeving the arc-shaped supports (4), and the arc-shaped supports (4) are composed of arc plates corresponding to the top ends of tunnels, first support plates keeping the widths of the support guard plates (3) consistent with those of the support guard plates, and second support plates corresponding to the storage sliding grooves.
5. The tunnel surrounding rock supporting structure according to claim 2, wherein the driving assembly comprises a ball screw (7) which is rotatably arranged on the inner wall of one end of the mounting plate (1) through a damping bearing and extends out of the other end of the mounting plate (1), two nuts (8) are mounted on the ball screw (7) in a matched manner, and four traction rods (9) are connected between the two nuts (8) and the two sliding plates (2) through pin shafts.
6. The tunnel surrounding rock supporting structure according to claim 5, wherein one end of the ball screw (7) extending to the outside of the mounting plate (1) is fixedly connected with a handle made of frosted materials, and the ball screw (7) is a bidirectional thread.
7. The tunnel surrounding rock supporting structure according to claim 2, wherein the moving assembly comprises four containing grooves (10) formed in a supporting guard plate (3), four grooves (11) which are formed in the outer wall of the supporting guard plate (3) and correspond to the containing grooves (10) are formed in the outer wall of the supporting guard plate, a worm (12) and a rotating shaft (13) are rotatably arranged in the containing grooves (10) through damping bearings, and one end of the worm (12) extends into the grooves (11);
the storage groove (10) is connected with a driven rack (14) in a sliding mode, a worm wheel (15) and a driving gear (16) are fixedly sleeved on the rotating shaft (13), the worm wheel (15) is connected with the worm (12) in a meshed mode, the driving gear (16) is connected with the driven rack (14) in a meshed mode, and a roller (17) is fixedly connected to the lower end of the driven rack (14).
8. The tunnel surrounding rock supporting structure according to claim 7, wherein one end of the worm (12) located in the groove (11) is fixedly sleeved with a rotating plate, the sum of the width of the rotating plate and the length of one end of the worm (12) located in the groove (11) is smaller than the groove depth of the groove (11), the worm (12) is located at the upper end of the rotating shaft (13), and the worm (12) and the rotating shaft (13) are distributed in a cross shape.
9. The tunnel surrounding rock supporting structure according to claim 7, wherein the storage groove (10) is provided with a limiting sliding groove, and a limiting sliding block fixedly connected with the driven rack (14) is sleeved in the limiting sliding groove in a sliding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311438649.7A CN117513262A (en) | 2023-11-01 | 2023-11-01 | Tunnel surrounding rock supporting method and supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311438649.7A CN117513262A (en) | 2023-11-01 | 2023-11-01 | Tunnel surrounding rock supporting method and supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117513262A true CN117513262A (en) | 2024-02-06 |
Family
ID=89746754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311438649.7A Pending CN117513262A (en) | 2023-11-01 | 2023-11-01 | Tunnel surrounding rock supporting method and supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117513262A (en) |
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2023
- 2023-11-01 CN CN202311438649.7A patent/CN117513262A/en active Pending
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