CN219010992U - Basket traveling system is hung to cable-stay bridge front fulcrum - Google Patents
Basket traveling system is hung to cable-stay bridge front fulcrum Download PDFInfo
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- CN219010992U CN219010992U CN202223308672.8U CN202223308672U CN219010992U CN 219010992 U CN219010992 U CN 219010992U CN 202223308672 U CN202223308672 U CN 202223308672U CN 219010992 U CN219010992 U CN 219010992U
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Abstract
The utility model discloses a cable-stayed bridge front pivot hanging basket traveling system, which comprises a girder top bearing main truss traveling mechanism and a front pivot hanging basket bottom basket traveling mechanism, wherein the girder top bearing main truss traveling mechanism comprises a sliding girder, a front wheel, a rear wheel, a front bracket, a rear bracket, a front cushion block, a rear cushion block, a jacking mechanism, a main truss traveling counterforce device, a balancing weight, a limiting device, a sliding girder rear anchor rod group and a sliding Liang Zhongmao rod group; the front supporting point hanging basket bottom basket traveling mechanism comprises a front hanging point sliding device, an active traveling hanging frame, a front hanging point sliding device, a steel hanging belt, a bottom basket traveling counter-force device, a bottom basket rear anchor rod group and a bottom basket middle anchor rod group. The method is used for the segmental suspension casting construction of the concrete main beam of the cable-stayed bridge, and has the characteristics of safety, reliability, reasonable structure, simplicity in operation, high walking precision, labor saving and the like.
Description
Technical Field
The utility model relates to the technical field of bridge girder hanging basket hanging casting construction, in particular to a cable-stayed bridge front supporting point hanging basket traveling system which is applied to cable-stayed bridge concrete girder segmental hanging casting construction.
Background
The front supporting point hanging basket is used as a single-box multi-chamber box-type section girder cantilever pouring system of the bridge and is widely applied to various types of concrete girder cable-stayed bridges. According to the division of the concrete girder structure, the front supporting point hanging basket walks by means of the segment of the self walking system, and the main body structure of the girder of the corresponding segment is constructed. The front supporting point hanging basket traveling system is mainly divided into two parts, namely a girder top bearing main girder traveling mechanism and a front supporting point hanging basket bottom basket traveling mechanism.
The front supporting point hanging basket walking method widely applied at present is as follows: the steel rail or the sliding block is arranged below the bearing main truss, walking is performed through the counter-force seat, the hydraulic jack and the anchor rod, the bearing main truss rear anchor is arranged after the walking is completed, the bottom basket is lowered, the bottom basket walking counter-force seat, the hydraulic jack and the anchor rod are arranged at the bottom of the beam, the bottom basket tail end walking counter-buckling wheel is anchored on the main beam body, the bottom basket front end counter-buckling frame is hung on the bearing main truss, and the oil pump is started to complete the bottom basket walking. The existing front supporting point basket hanging walking method has the problems that the operation steps are complex, the walking precision is not high, the workload of installing the walking device components is large, the bottom basket is easy to shake back and forth due to the fact that the actual travel of the back buckling frame and the bottom basket is different, and the like.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide a cable-stayed bridge front supporting point hanging basket traveling system which is safe and reliable, reasonable in structure, simple to operate, high in traveling precision and labor-saving and a construction method, and is used for the cable-stayed bridge concrete girder segmental suspension casting construction.
The technical scheme adopted by the utility model is as follows: the main structure of the girder top bearing main girder traveling mechanism is two slide girders which are arranged at left and right intervals, a front wheel and a rear wheel are arranged below each slide girder, a front bracket is arranged at a position close to the front wheel, a rear bracket is arranged at a position close to the rear wheel, a front cushion block is arranged at the bottom of the front bracket, a rear cushion block is arranged at the bottom of the rear bracket, and a jacking mechanism is arranged at the slide girders; a group of main truss walking counterforce devices are arranged on the central axis under each sliding beam, the rear end of each sliding beam is provided with a balancing weight, the left side and the right side of the front part are provided with limiting devices, the limiting devices are anchored on the main beam, and each sliding beam is also provided with a sliding beam rear anchor rod group and a sliding Liang Zhongmao rod group which are used for respectively hooping the middle part and the rear part of the sliding beam on the main beam;
the front supporting point hanging basket bottom basket travelling mechanism comprises a front hanging point sliding device and an active travelling hanger, wherein a shoulder pole beam of the front hanging point sliding device is erected on the top of a sliding beam, two sides of the shoulder pole beam are respectively provided with a limiting clamp, and the limiting clamps are clamped on two sides of a top plate of the sliding beam for sliding guide; each shoulder pole beam is anchored with two steel slings distributed on two sides of the sliding beam, and the lower end of each steel sling is anchored with the front end of the front supporting point hanging basket bottom basket; the active traveling hanging bracket hangs the rear end of the front supporting point hanging basket bottom basket on the main beam through the hanging bracket anchor rod group and comprises a motor, and the driven steel rod is driven to rotate through a gear, so that the front supporting point hanging basket bottom basket is assisted to travel; each sliding beam is provided with a group of bottom basket walking counterforce devices; the front support point hanging basket bottom basket is further provided with a bottom basket rear anchor rod group and a bottom basket middle anchor rod group, and the front support point hanging basket bottom basket can be placed down by utilizing the bottom basket rear anchor rod group and the bottom basket middle anchor rod group, so that the rear end of the front support point hanging basket bottom basket falls on a driven steel rod of the active walking hanging frame.
As the optimization of the scheme, the limiting device can be detachably installed and anchored on the main beam so as to realize the recycling in the next construction cycle.
More preferably, the front wheel and the rear wheel are triaxial steel wheels.
Further preferably, the upper end of the steel sling, the shoulder pole beam, the lower end of the steel sling and the front end of the front supporting point hanging basket bottom basket are movably anchored.
The utility model has the beneficial effects that:
(1) Convenient walking and simple operation. The girder top bearing main girder traveling mechanism does not need to be provided with a profile steel track and a sliding block, the sliding girder can directly travel by utilizing a steel wheel after being lowered to the top surface of the girder, and the front supporting point hanging basket bottom basket does not need to be subjected to anchoring system conversion before the girder top bearing main girder travels, and the two anchoring systems are relatively independent. The front supporting point hanging basket bottom basket can walk after being lowered, and a walking counterforce device is not required to be additionally arranged. The walking of the girder top bearing main girder walking mechanism can be completed in 30 minutes, and the walking of the girder bottom basket walking mechanism can be completed in 80 minutes.
(2) The walking precision is high. And the sliding beam of the beam top bearing main truss travelling mechanism and the front lifting point travelling shoulder pole beam of the front supporting point hanging basket bottom basket travelling mechanism are provided with limiting devices, so that the accurate offset position of the front supporting point hanging basket bottom basket travelling is ensured.
(3) The device is safe and stable, has reasonable structural stress, and is particularly suitable for the front supporting point hanging basket bottom basket walking of the ascending section of the large longitudinal slope cable-stayed bridge. The bottom basket travelling mechanism is provided with an active travelling hanging bracket, and can generate driving force to enable the travel of the bottom basket of the front supporting point hanging basket to be consistent with that of the travelling shoulder pole beam, so that the front hanging belt is ensured to be vertically stressed, and the bottom basket of the front supporting point hanging basket is prevented from swinging forwards.
(4) The holes of the walking suspenders are reserved on the main beam, only the holes of 4 walking suspenders are reserved, the counter-force pushing device is reasonable in arrangement, and a great amount of effort is not required to be consumed for installing the basket at the bottom of the basket to walk at each front supporting point.
(5) The intelligent walking, the walking stroke and the walking pushing force can be monitored, the control platform can correct the walking stroke in time, the front supporting point hanging basket bottom basket is guaranteed to symmetrically walk along the two sides of the central axis of the bridge, the pushing force of the hydraulic jacks on the two sides is collected, and the front supporting point hanging basket bottom basket walking state is monitored in real time.
(6) Saving labor force. Only 3 operators are needed for walking of the girder top bearing main girder: 1 operation control platform, 2 operation walking counterforce devices; the front supporting point hanging basket bottom basket walking only needs 4 workers: 1 operation control platform, 1 control active walking gallows switch, 2 operation reaction devices.
Drawings
FIG. 1 is a schematic three-dimensional structure of the present utility model (excluding the main beam);
FIG. 2 is a front bottom view of the present utility model;
FIG. 3 is an enlarged view of section C of FIG. 2;
FIG. 4 is an enlarged view of portion D of FIG. 2;
FIG. 5 is a schematic diagram of a three-dimensional structure of a girder top bearing main girder traveling mechanism;
fig. 6 is an enlarged view of the portion E of fig. 5;
fig. 7 is a side view of the present utility model.
Fig. 8, a ready state before walking of the girder top bearing main girder walking mechanism.
Fig. 9 shows the state after the girder top bearing main girder traveling mechanism is completed traveling.
Fig. 10 is a front-fulcrum cradle bottom-basket travel mechanism ready for travel.
Fig. 11 shows the state after the front supporting point hanging basket bottom basket traveling mechanism is completed.
Comprising the following steps: a main beam A and a front pivot hanging basket bottom basket B; the device comprises a beam top bearing main truss traveling mechanism 1, a sliding beam 11, a balancing weight 111, a rear wheel 12, a rear bracket 13, a rear cushion block 131, a front wheel 14, a front bracket 15, a front cushion block 151, a main truss traveling counterforce device 16, a limiting device 17, a sliding beam rear anchor rod group 18 and a sliding beam middle anchor rod group 19; the front supporting point hanging basket bottom basket traveling mechanism 2, a front hanging point sliding device 21, a limiting clamp 211, a shoulder pole beam 212, a bottom basket traveling counter-force device 22, a driving traveling hanging bracket 23, a motor 231, a driven steel rod 232, a hanging bracket anchor rod group 24, a steel hanging strap 25, a bottom basket rear anchor rod group 26 and a bottom basket middle anchor rod group 27.
Detailed Description
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
1-11, a cable-stayed bridge front pivot basket traveling system mainly comprises a beam top bearing main truss traveling mechanism 1 and a front pivot basket bottom basket traveling mechanism 2; the hydraulic power of the whole front supporting point hanging basket traveling system is controlled by the control platform, traveling travel data of each level are collected, the principle is the same as that of the bridge prestress intelligent tensioning machine, the hydraulic jack pressure value in the traveling process is intelligently calculated, and the hydraulic jack cylinder displacement information is collected in real time.
The beam top bearing main truss traveling mechanism 1 and the front supporting point hanging basket bottom basket traveling mechanism 2 are relatively independent, and the traveling work of the front supporting point hanging basket beam top bearing main truss and the front supporting point hanging basket bottom basket is respectively realized.
The main structure of the beam top bearing main truss traveling mechanism 1 is two sliding beams 11 which are arranged at left and right intervals, the sliding beams are box-shaped structures and serve as beam top bearing main trusses, are main bearing structures for front supporting point hanging basket bottom basket traveling and anchoring, and serve as working platforms of front supporting point hanging basket bottom basket traveling counterforce devices.
A front wheel 14 and a rear wheel 12 are arranged below each slide beam 11, and the front wheel 14 and the rear wheel 12 are preferably three-axle steel wheels. The front wheels 14 and the rear wheels 12 are respectively in a pair and are arranged at two sides of the sliding beam 11, and the beam top bearing main truss travelling mechanism 1 directly travels on the bridge deck by utilizing the front wheels 14 and the rear wheels 12 without additionally paving a track.
A front bracket 15 is provided near the front wheel 14, and a rear bracket 13 is provided near the rear wheel 12. The bottom of the front bracket 15 is equipped with a front pad 151, the bottom of the rear bracket 13 is equipped with a rear pad 131, and the skid beam 11 is equipped with a jack-up mechanism (not shown in the figure). The front bracket 15 and the rear bracket 13 are steel brackets; the front cushion block 151 and the rear cushion block 131 are all steel cushion blocks, are arranged at adjacent positions of the triaxial steel wheels and are used for supporting the sliding beam before and after the girder top bearing main girder travelling mechanism walks, and the steel cushion blocks are arranged below the steel corbels after the girder is walked, so that the bearing of the sliding beam is converted onto the steel corbels from the triaxial steel wheels.
A group of main truss walking counterforce devices 16 are arranged on the central axis under each sliding beam 11, the rear end of each sliding beam 11 is provided with a balancing weight 111, the left side and the right side of the front part are provided with limiting devices 17, and the limiting devices 17 are anchored on the main beam A. The limiting devices 17 are positioned at two sides of the sliding beam 11, are anchored on the concrete at the top of the poured main beam A, and are used for limiting the walking track of the sliding beam and ensuring the walking transverse precision in the walking process of the beam top bearing main truss walking mechanism. Preferably, the stop means 17 are capable of being detachably mounted and anchored for re-use in the next construction cycle.
Each skid beam 11 is also provided with a skid beam rear anchor rod group 18 and a skid beam middle anchor rod group 19, which are used for respectively hooping the middle part and the rear part of the skid beam 11 on the main beam A.
The front supporting point hanging basket bottom basket traveling mechanism 2 mainly comprises a front hanging point sliding device 21, a steel hanging strip 25, an active traveling hanging frame 23, a hanging frame anchor rod group 24, a bottom basket traveling counterforce device 22, a bottom basket rear anchor rod group 26 and a bottom basket middle anchor rod group 27.
The shoulder pole beam 212 of the front lifting point sliding device 21 is erected at the top of the sliding beam 11 and can slide on the sliding beam, two limiting clamps 211 are respectively arranged on two sides of the shoulder pole beam 212, and the two sides of the top plate of the sliding beam 11 are clamped for sliding guide to limit the sliding transverse position of the shoulder pole beam on the sliding beam. Each shoulder pole beam 212 is anchored with two steel slings 25 distributed on two sides of the sliding beam 11, the lower ends of the steel slings 25 are anchored at the front ends of the front supporting point hanging basket bottom baskets B, the front supporting point hanging basket bottom baskets and the shoulder pole beams are connected by the steel slings, and the front ends of the front supporting point hanging basket bottom baskets are hung on the sliding beam.
The active walking hanging bracket 23 hangs the rear end of the front supporting point hanging basket bottom basket B on the main beam A through the hanging bracket anchor rod group 24, and the concrete installation mode is as follows: the active walking hanging bracket 23 is arranged on the hanging bracket anchor rod group 24, the hanging bracket anchor rod group 24 is arranged on the main beam A, and the rear end of the front supporting point hanging basket bottom basket B falls on the active walking hanging bracket 23 after being put down. The active walking hanger 23 is mainly composed of a motor 231, a gear and a driven steel bar 232. After the motor 231 is started, the driven steel bar 232 is driven to rotate through the gear, so that the front supporting point hanging basket bottom basket B is assisted to walk.
Each sliding beam 11 is provided with a group of bottom basket walking counterforce devices 22, and the shoulder pole beam is pulled by the bottom basket walking counterforce devices on the sliding beams, so that the front end of the bottom basket of the front supporting point hanging basket is driven to walk forwards. The front supporting point hanging basket bottom basket B is also provided with a bottom basket rear anchor rod group 26 and a bottom basket middle anchor rod group 27, and the front supporting point hanging basket bottom basket B can be placed down by utilizing the bottom basket rear anchor rod group 26 and the bottom basket middle anchor rod group 27, so that the rear end of the front supporting point hanging basket bottom basket B falls on a driven steel rod 232 of the active walking hanging bracket 23, and the auxiliary walking of the rear end of the front supporting point hanging basket bottom basket is carried out.
The bottom basket walking counterforce device 22 mainly comprises a hydraulic jack, a traction rod and a front anchor block. The main truss traveling reaction force device 16 is mainly composed of a hydraulic jack, a traction rod, a front anchor block and a rear anchor block. The two reaction devices are formed and installed in a common structure, and are not described in detail herein.
In addition, the upper end and the shoulder pole beam 212 of the steel sling 25, the lower end and the front end of the front supporting point hanging basket bottom basket B are movably anchored, and when the front and rear ends of the front supporting point hanging basket bottom basket do not synchronously move, the steel sling 25 can rotate around the movable anchoring point.
Referring to fig. 8-11, a front pivot cradle walking construction method for a central cable-stayed bridge is based on the front pivot cradle walking system of the cable-stayed bridge, and comprises the following steps:
step one, preparing before walking of a girder top bearing main girder walking mechanism.
After the prestress tensioning work of the girder of the section is completed, the cable force of the stay cable is converted to the girder by a front supporting point hanging basket tensioning system, the steel hanging belt 25 is loosened to be naturally hung on a shoulder pole beam 212 of the sliding girder 11, the anchor rod group 19 and the anchor rod group 18 behind the sliding girder are sequentially removed from the sliding girder, the steel cushion block 131 and the front steel cushion block 151 are removed, the sliding girder 11 is lowered through a jacking mechanism, the rear wheel 12 and the front wheel 14 fall onto the girder, the limiting device 17 and the main girder walking counterforce device 16 are arranged on the girder, and the control platform oil pipe and the sensing wire of the main girder walking counterforce device 16 are connected.
At this time, the steel hanging belt 25 is loosened, the front end of the front supporting point hanging basket bottom basket B has no hanging point, and the front supporting point hanging basket bottom basket B is hung on the main beam A through the bottom basket rear anchor rod group 26 and the bottom basket middle anchor rod group 27.
Step two: the girder top bearing main girder travelling mechanism walks.
The control platform is operated, so that the two main girder traveling counterforce devices 16 drive the two sideslip girders 11 to travel forwards to reach the same rated travel, and the girder top bearing main girder traveling mechanism travels in a grading manner according to the circulation until the girder top bearing main girder reaches the designed and appointed position; in the process, oil pressure and displacement data displayed by the control platform are observed, and the walking process is monitored and regulated in real time.
Step three: the front fulcrum is ready for work before the basket hanging basket bottom basket travelling mechanism walks.
The jacking mechanism jacks up the sliding beam 11, installs a rear steel cushion block 131 and a front steel cushion block 151, enables the sliding beam 11 to fall on a main beam A, removes a main truss traveling counter-force device 16, fastens a steel sling 25 to hang on a shoulder pole beam 212 of the sliding beam 11, installs a sliding Liang Zhongmao rod group 19, a sliding beam rear anchor rod group 18 and installs and anchors a hanging bracket anchor rod group 24; the front supporting point hanging basket bottom basket B is lowered by utilizing the bottom basket rear anchor rod group 26 and the bottom basket middle anchor rod group 27, so that the rear end of the front supporting point hanging basket bottom basket B falls on a driven steel rod 232 of the driving walking hanging frame 23, and then the bottom basket rear anchor rod group 26 and the bottom basket middle anchor rod group 27 are removed; the oil pipe and the sensing wire of the bottom basket walking reaction force device 22 are connected with the control platform.
At this time, the sliding beam 11 falls on the front cushion block 151 and the rear cushion block 131 of the main beam a through the front bracket 15 and the rear bracket 13, the sliding beam 11 is fixed on the main beam a through the anchor rod group 19 in the sliding beam and the rear anchor rod group 18 in the sliding beam, the front end of the front supporting point hanging basket bottom basket B is hung on the sliding beam 11 through the front hanging point sliding device 21, the rear end is hung on the main beam through the active walking hanging frame 23, and the anchor rod group 26 and the anchor rod group 27 in the bottom basket are removed after the bottom basket is removed.
Step four: the front supporting point is hung on the bottom basket of the basket and the travelling mechanism of the bottom basket walks.
The control platform is operated, so that the two bottom basket traveling counterforce devices 22 drive the shoulder pole beams 212 to travel forwards, and simultaneously, the starting switch of the active traveling hanging bracket 23 is started, so that the front supporting point hanging basket bottom basket B is displaced forwards relative to the main beam A, the front hanging point sliding device 21 moves forwards along with the front supporting point hanging basket bottom basket B, and the active traveling hanging bracket 23 and the hanging bracket anchor rod group 24 are fixed. After the active traveling hangers 23 on the two sides reach the same rated stroke, closing the power of the active traveling hangers 23; the front supporting point basket hanging bottom basket travelling mechanism 2 carries out circulating and grading travelling until the front supporting point basket hanging bottom basket reaches a designed designated position; in the process, observing oil pressure and displacement data displayed by a control platform, and monitoring and adjusting the walking process in real time;
and after walking, installing a bottom basket rear anchor rod group 26 and a bottom basket middle anchor rod group 27, checking a front supporting point hanging basket anchoring system and other mechanisms, and starting the main girder segment main body structure circulation construction after meeting the requirements.
In the first step, the anchor rod group 19 in a group of sliding beams is reserved as a safety pressing beam, so that the overturning is prevented during construction of the ascending section of the cable-stayed bridge with the large longitudinal slope.
Claims (4)
1. The utility model provides a basket traveling system is hung to fulcrum before cable-stayed bridge, includes roof beam bearing main truss running gear (1) and preceding fulcrum and hangs basket bottom basket running gear (2), its characterized in that: the main structure of the beam top bearing main truss traveling mechanism (1) is composed of two sliding beams (11) which are arranged at left and right intervals, a front wheel (14) and a rear wheel (12) are arranged below each sliding beam (11), a front bracket (15) is arranged at a position close to the front wheel (14), a rear bracket (13) is arranged at a position close to the rear wheel (12), a front cushion block (151) is arranged at the bottom of the front bracket (15), a rear cushion block (131) is arranged at the bottom of the rear bracket (13), and a jacking mechanism is arranged at the sliding beam (11); a group of main truss walking counterforce devices (16) are arranged on the central axis under each sliding beam (11), the rear end of each sliding beam (11) is provided with a balancing weight (111), the left side and the right side of the front part are provided with limiting devices (17), the limiting devices (17) are anchored on the main beam (A), each sliding beam (11) is also provided with a sliding beam rear anchor rod group (18) and a sliding Liang Zhongmao rod group (19) which are used for respectively hooping the middle part and the rear part of the sliding beam (11) on the main beam (A);
the front supporting point hanging basket bottom basket travelling mechanism (2) comprises a front hanging point sliding device (21) and an active travelling hanging frame (23), a shoulder pole beam (212) of the front hanging point sliding device (21) is erected on the top of the sliding beam (11), two limiting clamps (211) are respectively arranged on two sides of the shoulder pole beam (212), and the limiting clamps are clamped on two sides of a top plate of the sliding beam (11) to conduct sliding guide; each shoulder pole beam (212) is anchored with two steel slings (25) distributed on two sides of the sliding beam (11), and the lower end of each steel sling (25) is anchored with the front end of the front supporting point hanging basket bottom basket (B); the active traveling hanging bracket (23) hangs the rear end of the front supporting point hanging basket bottom basket (B) on the main beam (A) through the hanging bracket anchor rod group (24), and the active traveling hanging bracket (23) comprises a motor (231) and drives a driven steel rod (232) to rotate through a gear, so that the front supporting point hanging basket bottom basket (B) is assisted to travel; a group of bottom basket walking counterforce devices (22) are arranged on each sliding beam (11); the front supporting point hanging basket bottom basket (B) is further provided with a bottom basket rear anchor rod group (26) and a bottom basket middle anchor rod group (27), and the front supporting point hanging basket bottom basket (B) can be lowered by utilizing the bottom basket rear anchor rod group (26) and the bottom basket middle anchor rod group (27), so that the rear end of the front supporting point hanging basket bottom basket (B) falls on a driven steel rod (232) of the active walking hanging bracket (23).
2. The cable-stayed bridge front support basket traveling system according to claim 1, wherein: the limiting device (17) can be detachably mounted and anchored on the main beam (A) so as to realize the recycling in the next construction cycle.
3. The cable-stayed bridge front support basket traveling system according to claim 1, wherein: the front wheel (14) and the rear wheel (12) adopt triaxial steel wheels.
4. The cable-stayed bridge front support basket traveling system according to claim 1, wherein: the upper end of the steel sling (25) and the shoulder pole beam (212), the lower end of the steel sling and the front end of the front supporting point hanging basket bottom basket (B) are movably anchored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223308672.8U CN219010992U (en) | 2022-12-09 | 2022-12-09 | Basket traveling system is hung to cable-stay bridge front fulcrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223308672.8U CN219010992U (en) | 2022-12-09 | 2022-12-09 | Basket traveling system is hung to cable-stay bridge front fulcrum |
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| Publication Number | Publication Date |
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| CN219010992U true CN219010992U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223308672.8U Active CN219010992U (en) | 2022-12-09 | 2022-12-09 | Basket traveling system is hung to cable-stay bridge front fulcrum |
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| Country | Link |
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| CN (1) | CN219010992U (en) |
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