CN111139888B - Soil nail wall pore-forming device - Google Patents
Soil nail wall pore-forming device Download PDFInfo
- Publication number
- CN111139888B CN111139888B CN201911410411.7A CN201911410411A CN111139888B CN 111139888 B CN111139888 B CN 111139888B CN 201911410411 A CN201911410411 A CN 201911410411A CN 111139888 B CN111139888 B CN 111139888B
- Authority
- CN
- China
- Prior art keywords
- workbench
- adjusting
- operating platform
- baffle
- forming device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/16—Machines for digging other holes in the soil
- E02F5/18—Machines for digging other holes in the soil for horizontal holes or inclined holes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/16—Machines for digging other holes in the soil
Abstract
The invention provides a soil nailing wall tapping device which comprises a rack, wherein a workbench is arranged on the rack, an operating platform is connected to one end of the workbench, a movable workbench is arranged on the operating platform in a sliding manner, and a rotating shaft with a drill bit is arranged on the movable workbench in a rotating manner; meanwhile, an adjusting block for adjusting the inclination angle of the operating platform is arranged on the operating platform, and the top surface of the adjusting block is an obliquely arranged thrust surface; the invention realizes the random adjustment of the inclination angle of the operating platform through the adjusting block, simultaneously the inclination angle of the drill bit is fixed in the operating process, the drilling error can be effectively controlled, and workers can realize the rapid excavation of soil nail holes only by rotating the drill bit.
Description
Technical Field
The invention relates to the technical field of foundation pit construction equipment, in particular to a soil nailing wall hole forming device.
Background
The soil nailing wall is an in-situ soil body reinforcement technology, a foundation pit side slope is reinforced by soil nails made of reinforcing steel bars, a reinforcing mesh is laid on the surface of the side slope, and then a layer of concrete surface layer is sprayed on the surface of the side slope, so that the side slope reinforced support construction method is a side slope reinforced support construction method combining the side slope with a soil body around the reinforced member bar (namely, a soil nail or an anchor rod) arranged in a slope body and a support structure similar to a gravity retaining wall formed by the surface layer; in the construction process of the soil nailing wall, soil nailing holes with a certain depth and an inclination angle need to be formed in a soil layer, then soil nails are inserted into the soil nailing holes, a Luoyang shovel is generally adopted to carry out manual hole forming operation in the prior art, the labor intensity of workers is high, meanwhile, the inclination angle of the soil nailing holes completely depends on the experience of the workers, errors in the hole forming process are large, and the construction quality of the soil nailing wall is influenced.
Disclosure of Invention
Aiming at the defects that the inclination angle error of a soil nail hole is large and the angle cannot be adjusted at will in the prior art, the invention discloses a soil nail wall pore-forming device.
The invention realizes the aim through the following technical scheme:
a soil nail wall pore-forming device comprises a rack, wherein a workbench is arranged on the rack, one end of the workbench is hinged with an operating platform, a movable workbench is arranged on the operating platform in a sliding manner, an adjusting screw rod is also rotatably arranged on the bottom surface of the operating platform, a first connecting sleeve and a sliding groove which are matched with each other are arranged between the movable workbench and the operating platform, and the first connecting sleeve is connected with an adjusting screw rod through a screw thread; a rotating shaft is arranged on the movable workbench, and a drill bit is fixedly arranged at one end of the rotating shaft; the workbench is provided with an adjusting groove, an adjusting block is arranged in the adjusting groove in a sliding mode, the top surface of the adjusting block is obliquely provided with a thrust surface attached to the bottom surface of the operating platform, and a fastening bolt is arranged between the adjusting block and the workbench.
Preferably, be provided with the articulated shaft and the connection journal stirrup of mutually supporting between workstation and the operation panel, the lock bolt with the articulated shaft adaptation is connected to the screw thread on the connection journal stirrup.
Preferably, the bottom surface of the operating platform is also fixedly provided with a sliding rod, and the movable working platform is connected with the sliding rod in a sliding manner through a linear bearing seat.
Preferably, the four corners of the rack are respectively provided with a connecting rod, the connecting rods are connected with telescopic supporting rods through second connecting sleeve screw threads, one ends of the telescopic supporting rods are fixedly provided with adjusting rods, and the other ends of the telescopic supporting rods are provided with supporting plates.
Preferably, the workbench is provided with a first baffle and a second baffle which are parallel to each other, the adjusting groove is located between the first baffle and the second baffle, and the first baffle and the second baffle are both provided with waist-shaped holes matched with the fastening bolts.
Preferably, the workbench is provided with a horizontal bubble.
Preferably, the movable workbench is provided with a lubricating oil hole.
Preferably, a scale used for calibrating the inclination angle of the operating platform is arranged in the adjusting groove.
Preferably, the adjusting screw and the rotating shaft are both provided with adjusting rotating wheels, and the side surface of the adjusting block is fixedly provided with an adjusting rod.
Preferably, the bottom surface of the workbench is provided with a scissor type lifting frame.
Compared with the prior art, the utility model discloses following beneficial effect has.
1. The drill bit comprises a rack, wherein a workbench and an operation table which are mutually hinged are arranged on the rack, a movable workbench is arranged on the operation table in a sliding manner, a rotating shaft is arranged on the movable workbench, the rotating shaft is fixedly connected with a drill bit, the movable workbench is connected through a screw thread of an adjusting screw rod, and an adjusting block for adjusting the inclination angle of the operation table is also arranged on the workbench; when the device is used, the adjusting block is pushed to push the operating platform to slide, so that the included angle between the operating platform and the operating platform is changed, and the operating platform is in a horizontal position in the installation process of equipment, so that the included angle between the operating platform and the horizontal plane is the inclined included angle of the soil nail hole, and the drill bit is ensured to always work at a constant included angle in the working process, and the stability of the inclination angle of the soil nail hole is ensured;
the invention adopts the adjusting block to adjust the inclination angle of the operating platform, and the position of the adjusting block can be changed at will, so the angle of the operating platform can be adjusted at will according to the actual requirement, the inclination angle adjusting range of the operating platform is wirelessly enlarged, and the use is more convenient.
Meanwhile, the drill bit is controlled to rotate continuously by rotating the rotating shaft, and the movable workbench is driven to move forward continuously by rotating the adjusting screw rod.
2. According to the invention, the hinge shaft and the connecting support lug which are mutually matched are arranged between the operating platform and the operating platform, the connecting support lug is in threaded connection with the locking bolt matched with the hinge shaft, and after the operating platform is adjusted in place, the end surface of the locking bolt is abutted against the hinge shaft, so that the operating platform is ensured to be fixed, the operating platform is prevented from deviating upwards in the working process, and the stability and the reliability of equipment are improved.
3. The bottom surface of the operating platform is also fixedly provided with a sliding rod, and the movable working platform is connected with the sliding rod in a sliding manner through a linear bearing seat.
4. The four corners of the rack are respectively provided with one connecting rod, the connecting rods are connected with the telescopic supporting rods through the second connecting sleeve threads, and the height of the operating platform can be changed through the telescopic supporting rods, so that the hole forming requirements of soil nailing walls with different heights are met, and the application range of the device is expanded; simultaneously at the fixed regulation pole that is provided with of one end of flexible bracing piece, conveniently realize the quick release of flexible bracing piece and retrieved, and the other end of doing the bracing piece at the god is provided with the backup pad, improves the area of contact on whole equipment and ground, stability in the improve equipment course of operation avoids because of the pore-forming error that the equipment shake arouses.
5. The workbench is provided with the first baffle and the second baffle which are parallel to each other, the adjusting groove is positioned between the first baffle and the second baffle, the first baffle and the second baffle are combined to form the sliding groove, the workbench can be effectively prevented from being modified, the processing difficulty and the production cost of equipment are greatly reduced, on the other hand, the adjusting block can be effectively limited through the first baffle and the second baffle, and the adjusting precision of the operation table is prevented from being influenced due to the deviation in the working process; simultaneously all be provided with on first baffle and the second baffle with the waist type hole of fastening bolt adaptation, realize the fixed of adjusting block, reduce locking bolt's pressure, guarantee its stability at the operation panel in the course of the work.
6. According to the invention, the horizontal air bubbles are arranged on the workbench, so that the workbench can be conveniently leveled, and the adjustment precision of the operation table is ensured.
7. The movable workbench is provided with the lubricating oil hole, so that lubricating oil can be conveniently injected between the operating platform and the movable workbench, the operating sensitivity of the movable workbench is improved, the abrasion between the movable workbench and the operating platform is reduced, and the service life of equipment is prolonged.
8. According to the invention, the scale used for calibrating the inclination angle of the operating platform is arranged in the adjusting groove, the lifting of the operating platform is controlled by the adjusting block, and the size of the adjusting block is fixed, so that the length of a right-angle side in the vertical direction is fixed in a right-angle triangle formed by the operating platform and the adjusting block in the operating platform, and the tangent value of the included angle between the operating platform and the operating platform is the ratio of the height of the adjusting block and the distance from the front end surface of the adjusting block to the intersection point of the operating platform and the operating platform, so that the length can be converted into the inclination angle of the operating platform, and the operating platform can be quickly adjusted, and is convenient to use.
9. According to the invention, the adjusting rotating wheels are arranged on the adjusting screw rod and the rotating shaft, and the adjusting rod is fixedly arranged on the side surface of the adjusting block, so that an operator can conveniently and rapidly operate the equipment, the labor intensity is reduced, and the use comfort of the equipment is improved. .
10. According to the invention, the shear type lifting frame is arranged at the bottom of the workbench, and the whole set of equipment is quickly lifted in high altitude through the shear type lifting frame, so that the operation requirement of high-rise soil nail holes is met, and the application range of the equipment is further expanded.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a rear view of the present invention;
FIG. 3 is a rear view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is a schematic view of the structure of the adjusting block of the present invention;
FIG. 6 is a schematic view of a workbench according to the present invention;
FIG. 7 is a schematic view of the structure of the operation table of the present invention;
FIG. 8 is a schematic side view of the structure of embodiment 2 of the present invention;
reference numerals: 1. the device comprises a rack, 2, a workbench, 3, an operation platform, 4, a movable workbench, 5, an adjusting screw rod, 6, a first connecting sleeve, 7, a sliding groove, 8, a rotating shaft, 9, a drill bit, 10, an adjusting groove, 11, an adjusting block, 12, a thrust surface, 13, a fastening bolt, 14, a hinge shaft, 15, a connecting lug, 16, a locking bolt, 17, a sliding rod, 18, a linear bearing seat, 19, a connecting rod, 20, a telescopic supporting rod, 21, an adjusting rod, 22, a supporting plate, 23, a first baffle, 24, a second baffle, 25, a kidney-shaped hole, 26, a horizontal bubble, 27, a lubricating oil hole, 28, a scale, 29, an adjusting rotating wheel, 30, a scissor type lifting frame, 31, a bearing seat, 32 and a second connecting sleeve.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following embodiments.
Embodiment mode 1
The embodiment is used as a basic embodiment of the invention, and discloses a soil nailing wall pore-forming device, which has a specific structure shown in fig. 1 and comprises a rack 1, wherein a workbench 2 is fixedly arranged at the top end of the rack 1, a hinge shaft 14 is fixedly arranged at one end of the workbench 2, two sets of connecting support lugs 15 are rotatably connected on the hinge shaft 14 through revolute pairs, the two connecting support lugs 15 are simultaneously and fixedly connected with an operating platform 3, so that the hinged connection between the workbench 2 and the operating platform 3 is realized, a locking bolt 16 is also in threaded connection on the connecting support lugs 15, and the end face of the locking bolt 16 abuts against the end face of the hinge shaft 14 to realize the fixation of the operating platform;
a first baffle plate 23 and a second baffle plate 24 which are parallel to each other are fixedly arranged on the workbench 2, an adjusting groove 10 is arranged between the first baffle plate 23 and the second baffle plate 24, an adjusting block 11 is arranged in the adjusting groove 10 in a sliding manner, the top surface of the adjusting block 11 is a thrust surface 12 which is arranged obliquely, and the thrust surface 12 is completely attached to the bottom surface of the operating platform 3, so that the supporting adjustment of the operating platform 3 is realized, waist-shaped holes 25 are arranged on the first baffle plate 23 and the second baffle plate 24, fastening bolts 13 which are matched with the waist-shaped holes 25 are arranged on the adjusting block 11, and an adjusting rod 21 is fixedly arranged on one side of the adjusting block 11;
a movable workbench 4 is arranged on the operating platform 3 in an interactive manner through a sliding pair, the top surface of the movable workbench 4 is rotatably connected with a rotating shaft 8 through a bearing seat 31, an operating end of the rotating shaft 8 is provided with an adjusting rotating wheel 29, and a working end of the rotating shaft 8 is fixedly connected with a drill bit 9 through a bolt; be provided with spout 7 on operation panel 3, the underrun of operation panel 3 is provided with regulation lead screw 5 through the rotation of bearing frame 31, and the operating end of adjusting lead screw 5 is fixed and is provided with regulation runner 29, is provided with first connecting sleeve 6 in the bottom surface of activity workstation 4 is fixed simultaneously, first connecting sleeve 6 passes spout 7 and links to each other with regulation lead screw 5 screw thread to it is translational motion to drive activity workstation 4 through the rotation of adjusting lead screw 5.
Embodiment mode 2
The embodiment is a preferred embodiment of the invention, and discloses a soil nailing wall pore-forming device, which comprises a frame, wherein the concrete structure is as shown in fig. 1 to 7, the soil nailing wall pore-forming device comprises a frame 1, a workbench 2 is arranged on the frame 1, an operation table 3 is hinged on the workbench 2, a movable workbench 4 is arranged on the operation table 3 in a sliding manner, a sliding rod 17 is fixedly arranged at the bottom surface of the operation table 3 through a connecting seat, a sliding groove 7 is also arranged on the operation table 3, a linear bearing seat 18 is fixedly arranged at the bottom surface of the movable workbench 4, and the linear bearing seat 18 penetrates through the sliding groove 7 to be in interactive connection with the sliding rod 17;
furthermore, all fixedly provided with connecting rod 19 on four landing legs of frame 1, the welding has second connecting sleeve 32 on the connecting rod 19, the screw thread is connected with flexible bracing piece 20 in the second connecting sleeve 32, the bottom fixedly connected with backup pad 22 of flexible bracing piece 20, its upper end is fixed and is provided with regulation pole 21.
Furthermore, a horizontal bubble 26 for judging whether the workbench 2 is horizontal is arranged on the workbench 2, a scale 28 for calibrating the inclination angle of the operating platform 3 is also arranged in the adjusting groove 10, and the scale line of the scale 28 is coplanar with the front end surface of the adjusting block 11.
In the embodiment 3, the first step of the method,
the embodiment is another preferred embodiment of the present invention, and discloses a soil nailing wall hole forming device, the specific structure of which is shown in fig. 8, and the device comprises a workbench 2, an operation table 3 is hinged on the workbench 2, and a shear type lifting frame 30 is fixedly connected to the bottom surface of the workbench 2.
When the drill bit is used, the whole set of equipment is placed at a working point, the leveling is carried out through the horizontal bubbles, then the inclination angle of the operating platform is changed to a specified angle by changing the position of the adjusting block, after the fixing of the operating platform is completed, the adjusting rotating wheel of the rotating shaft is rotated to drive the drill bit to rotate, the movable operating platform is continuously pushed forward by rotating the adjusting screw rod while the drill bit rotates, and the drill bit is further pushed to continuously deeply form a hole;
compared with the prior art, in the hole forming process, workers only need to rotate the adjusting rotating wheel, so that the labor intensity of the workers is greatly reduced; secondly, the operating workbench is in a locked state after being adjusted in place, so that the drill bit can continuously drill at a constant inclination angle until a hole is formed finally, and the inclination error of the hole of the soil nailing wall is effectively controlled; finally, the inclination angle of the operation table is adjusted through the adjusting block, and the position of the adjusting block can be changed at will, so that the inclination angle of the operation table can be adjusted at will without adjusting the inclination angle at intervals, the adjusting range is wider, the adaptability to the construction technology is stronger, meanwhile, the operation of the wall hole higher than the soil nailing wall hole can be realized by additionally arranging the lifting equipment, and the application range is wide.
Claims (6)
1. A soil nail wall pore-forming device comprises a rack (1), wherein a workbench (2) is arranged on the rack (1), an operation table (3) is hinged to one end of the workbench (2), a movable workbench (4) is slidably arranged on the operation table (3), an adjusting screw rod (5) is further rotatably arranged on the bottom surface of the operation table (3), a first connecting sleeve (6) and a sliding groove (7) which are matched with each other are arranged between the movable workbench (4) and the operation table (3), and the first connecting sleeve (6) is in threaded connection with the adjusting screw rod (5); a rotating shaft (8) is arranged on the movable workbench (4), and a drill bit (9) is fixedly arranged at one end of the rotating shaft (8); an adjusting groove (10) is formed in the workbench (2), an adjusting block (11) is arranged in the adjusting groove (10) in a sliding mode, a thrust surface (12) attached to the bottom surface of the operating platform (3) is obliquely arranged on the top surface of the adjusting block (11), and a fastening bolt (13) is arranged between the adjusting block (11) and the workbench (2);
a hinged shaft (14) and a connecting support lug (15) which are matched with each other are arranged between the workbench and the operating platform (3), and a locking bolt (16) matched with the hinged shaft (14) is connected to the connecting support lug (15) in a threaded manner;
a sliding rod (17) is fixedly arranged on the bottom surface of the operating platform (3), and the movable working platform (4) is connected with the sliding rod (17) in a sliding manner through a linear bearing seat (18);
four corners of the rack (1) are respectively provided with a connecting rod (19), the connecting rods (19) are connected with a telescopic supporting rod (20) through a second connecting sleeve (32) in a threaded manner, one end of the telescopic supporting rod (20) is fixedly provided with an adjusting rod (21), and the other end of the telescopic supporting rod is provided with a supporting plate (22);
be provided with first baffle (23) and second baffle (24) that are parallel to each other on workstation (4), adjustment tank (10) are located between first baffle (23) and second baffle (24), all be provided with waist type hole (25) with fastening bolt (13) adaptation on first baffle (23) and second baffle (24).
2. The soil nailing wall hole forming device as claimed in claim 1, wherein: the workbench (2) is provided with horizontal bubbles (26).
3. The soil nailing wall hole forming device as claimed in claim 1, wherein: and a lubricating oil hole (27) is formed in the movable workbench (4).
4. The soil nailing wall hole forming device as claimed in claim 1, wherein: and a scale (28) for calibrating the inclination angle of the operating platform (3) is arranged in the adjusting groove (10).
5. The soil nailing wall hole forming device as claimed in claim 1, wherein: adjusting rotating wheels (29) are arranged on the adjusting screw rod (5) and the rotating shaft (8), and adjusting rods (21) are fixedly arranged on the side faces of the adjusting blocks (11).
6. The soil nailing wall hole forming device as claimed in claim 1, wherein: the bottom surface of the workbench (2) is provided with a shear type lifting frame (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911410411.7A CN111139888B (en) | 2019-12-31 | 2019-12-31 | Soil nail wall pore-forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911410411.7A CN111139888B (en) | 2019-12-31 | 2019-12-31 | Soil nail wall pore-forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111139888A CN111139888A (en) | 2020-05-12 |
| CN111139888B true CN111139888B (en) | 2022-05-03 |
Family
ID=70522469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911410411.7A Active CN111139888B (en) | 2019-12-31 | 2019-12-31 | Soil nail wall pore-forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111139888B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926819B (en) * | 2020-07-13 | 2021-08-24 | 福建和盛达建筑工程有限公司 | Soil nailing wall pouring device and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139594Y (en) * | 1992-10-13 | 1993-08-04 | 冶金工业部沈阳勘察研究院 | Machine for anchoring structural element |
| CN206550610U (en) * | 2017-03-10 | 2017-10-13 | 广州广日物流有限公司 | A kind of counterweight frame assembly or fitting table |
| CN107538277A (en) * | 2017-09-28 | 2018-01-05 | 桂林福达齿轮有限公司 | A kind of spiral bevel gear tool section angular adjustment device |
| CN208105259U (en) * | 2018-04-23 | 2018-11-16 | 宜昌恒生建筑安装有限公司 | A kind of architectural engineering roofbolt construction arrangement |
| CN209040176U (en) * | 2018-10-26 | 2019-06-28 | 浙江建效工程管理咨询有限公司 | A kind of building Deviation Correction device |
-
2019
- 2019-12-31 CN CN201911410411.7A patent/CN111139888B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111139888A (en) | 2020-05-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211924067U (en) | Constructional engineering pile device | |
| CN111139888B (en) | Soil nail wall pore-forming device | |
| CN111074887A (en) | Portable soil nail mounting plate | |
| CN112302534B (en) | Slope anchor rod construction device and rapid construction method | |
| CN113403925A (en) | High-pressure asphalt joint filling device for water conservancy construction and using method thereof | |
| CN211286778U (en) | Strutting arrangement for civil engineering | |
| CN210342736U (en) | Spread thick liquid auxiliary device and automatic thick liquid device of spreading | |
| CN115853313A (en) | Existing building floor dismantling, rebuilding and expanding equipment and rebuilding and expanding method thereof | |
| CN207377492U (en) | A kind of colliery joint-cutting drilling machine | |
| CN106246112B (en) | Angular adjustment frame and its application method for side slope drilling device | |
| CN212027225U (en) | Portable height adjustment support | |
| CN214497521U (en) | High-pressure rotary jet pile machine | |
| CN115075851A (en) | Tunnel roof fall emergency treatment structure and construction method | |
| CN210559087U (en) | Adjustable punching jack | |
| CN209891688U (en) | High building quick-building safe construction foot rest | |
| CN217175595U (en) | Trolley system suitable for concrete structure factory building construction | |
| CN207989048U (en) | A kind of big telescoping steel form driving system of subway station concrete side wall construction | |
| CN206873303U (en) | A pin-connected panel high position falls boom support | |
| CN206873409U (en) | The two-way small Traffic control system erecting device of gate lower shaft | |
| CN111411771A (en) | A quick strutting arrangement of template for building engineering | |
| CN211114903U (en) | Pre-buried bolt accuracy control device | |
| CN219654638U (en) | Multifunctional pneumatic leg pneumatic pick for mine rock roadway | |
| CN217756806U (en) | Lifting device for building site water and electricity construction | |
| CN213205003U (en) | Building construction discharge apparatus | |
| CN219864876U (en) | Building construction drilling appurtenance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221221 Address after: 400700 No.2, Wenchang Road, Beibei District, Chongqing Patentee after: THE 5TH ENGINEERING CO.,LTD. OF CHINA RAILWAY 22ND BUREAU Group Patentee after: China Railway 22nd Bureau Group Co.,ltd. Address before: 400700 No.2, Wenchang Road, Beibei District, Chongqing Patentee before: THE 5TH ENGINEERING CO.,LTD. OF CHINA RAILWAY 22ND BUREAU Group |