CN216840814U - Adjustable assembled temporary stair - Google Patents
Adjustable assembled temporary stair Download PDFInfo
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- CN216840814U CN216840814U CN202123304484.3U CN202123304484U CN216840814U CN 216840814 U CN216840814 U CN 216840814U CN 202123304484 U CN202123304484 U CN 202123304484U CN 216840814 U CN216840814 U CN 216840814U
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- pedal
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- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000007306 turnover Effects 0.000 abstract description 14
- 238000010276 construction Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model provides an adjustable assembled interim stair belongs to building engineering technical field, and the scheme of adoption is: the adjustable pedal comprises a top pedal body, a bottom pedal body and a plurality of middle pedal bodies, wherein the top pedal body, the bottom pedal body and the middle pedal bodies all comprise pedal main body bodies, an adjustable connecting portion I and/or an adjustable connecting portion II are/is arranged on the pedal main body, the adjustable connecting portion I is arranged on the upper end face of the pedal main body, the adjustable connecting portion II is arranged on the lower end face of the pedal main body, and two adjacent pedal main bodies are fixedly connected through the adjustable connecting portion I and the adjustable connecting portion II. The device simple structure, be convenient for install and remove, can lay in a flexible way, through the quantity that changes middle footboard, solved the current problem between the not co-structure height, set up adjustable connecting portion and can satisfy the requirement of the different height of marking time, be convenient for realize the turnover utilization of spare part.
Description
Technical Field
The utility model relates to a building engineering technical field especially relates to an adjustable assembled temporary stair.
Background
In the building engineering work progress, for solving the current problem of personnel, often need set up interim stair, supply the construction site personnel to use, current construction method often adopts the steel pipe to detain the frame and sets up interim stair or adopts steel sheet welding regularization interim stair to guarantee that personnel's in the work progress is current from top to bottom.
Because the elevation of different floor structures or passageway positions is different, current interim stair passageway ubiquitous has following problem: firstly, the temporary stairs are erected by adopting steel pipe fasteners, a large amount of turnover materials are required, the construction efficiency is low, the construction cost is high, and the turnover utilization is inconvenient; secondly, adopt the steel sheet to weld finalize the design temporary stair, this temporary stair is comparatively single, can not satisfy not co-altitude, the different height requirements of marking time, only can reuse after needing to transform, increases construction cost to the size is great, and the transport of being not convenient for is difficult to the turnover.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned prior art in the unable regulation of height and be difficult to the not enough of turnover utilization, the utility model provides an adjustable assembled temporary stair makes the whole height of device and highly all adjustable of marking time to be convenient for install and remove and turnover utilization.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: the utility model provides an adjustable assembled temporary stair, includes top footboard, bottom footboard and a plurality of middle footboard, and top footboard, bottom footboard and middle footboard all include the footboard main part, are provided with adjustable connecting portion one and/or adjustable connecting portion two in the footboard main part, and adjustable connecting portion one sets up in the up end of footboard main part, and adjustable connecting portion two sets up in the lower terminal surface of footboard main part, and two adjacent footboard main parts pass through adjustable connecting portion one and two fixed connection of adjustable connecting portion. Firstly, determining the overall height of the needed temporary stair according to the construction condition, and further determining the number of needed middle pedals through calculation; when the device is laid, the adjacent middle pedals are fixedly connected through the first adjustable connecting part and the second adjustable connecting part, the middle pedals at the two ends are respectively and fixedly connected with the bottom pedal or the top pedal through the first adjustable connecting part or the second adjustable connecting part, the overall height of the device can be adjusted by changing the number of the middle pedals, and the height between the adjacent pedal main bodies can be adjusted by matching the first adjustable connecting part and the second adjustable connecting part so as to realize the adjustment of the step height; after the construction, can disassemble the device for footboard main part and other spare parts that are used for connecting, be convenient for realize the turnover utilization of spare part.
Further, the first adjustable connecting portion comprises two first connecting plates, the second adjustable connecting portion comprises two second connecting plates, the first connecting plates and the second connecting plates are fixedly connected to the pedal main body and are arranged at two ends along the length direction of the pedal main body, first strip-shaped holes extending along the vertical direction are formed in the first connecting plates, corresponding second strip-shaped holes are formed in the second connecting plates, and bolts penetrate through the first strip-shaped holes and the second strip-shaped holes to fix the first adjustable connecting portion and the second adjustable connecting portion which are adjacent in a locking mode. The height between two adjacent pedal bodies can be changed by matching the bolt with the strip-shaped holes I and II, so that the requirements of different step heights are met, the stride of different constructors can be adapted, and the applicability of the device is improved.
Furthermore, a through groove extending along the length direction of the connecting plate II is further formed in the connecting plate II, and the cross section shape of the through groove is matched with that of the connecting plate I. The arrangement of the through groove on the second connecting plate enables the first connecting plate to slide along the through groove, so that the first connecting plate and the second connecting plate can be prevented from being separated while the fixing position of the bolt is adjusted conveniently, and the reliability of the device is enhanced.
Furthermore, the two ends of the middle pedal in the width direction are respectively provided with a first adjustable connecting part and a second adjustable connecting part, one end, close to the middle pedal, of the bottom pedal is provided with the first adjustable connecting part, the other end of the bottom pedal is provided with a first supporting mechanism, one end, close to the middle pedal, of the top pedal is provided with the second adjustable connecting part, and the other end of the top pedal is fixed with the second supporting mechanism. Adjustable connecting portion one, two all set up in the both ends of footboard main part along its width direction, are convenient for enlarge the area that the footboard main part supplied to trample when guaranteeing adjacent footboard main part connection stability, guarantee the security of work progress.
Furthermore, the first supporting mechanism comprises at least two first supporting legs, the first supporting legs are symmetrically arranged relative to the center line of the bottom pedal, the upper ends of the first supporting legs are fixedly connected with the bottom pedal, and the lower ends of the first supporting legs are provided with stabilizing supporting feet. The arrangement of the stabilizing support legs can increase the contact area between the supporting mechanism and the ground, and the stability of the device is improved.
Further, two piece at least landing legs are included to the supporting mechanism two, and two landing legs are set up about the central line symmetry of top footboard, and every landing leg two all includes the landing leg main part, and the lower extreme of landing leg main part is connected with stabilizes the stabilizer blade, and the upper end is through connecting portion and top footboard fixed connection. The stability of the device is enhanced, and the device is prevented from overturning when bearing load is uneven.
Furthermore, the landing leg main body comprises a plurality of first connecting sleeves and second connecting sleeves, the first connecting sleeves are arranged at two ends of the landing leg main body, and the first connecting sleeves and the second connecting sleeves are arranged in a staggered mode. The height of the landing leg main body can be conveniently adjusted according to different device heights, and the connection reliability can be conveniently improved by the aid of the first connecting sleeves and the second connecting sleeves which are arranged in a staggered mode, so that the load bearing capacity of the landing leg main body is enhanced.
Further, still include the handrail, the handrail includes a plurality of handrail units, and handrail unit includes vertical connecting rod, and the upper end of connecting rod is provided with hand portion, and the lower extreme of connecting rod extends to the footboard main part to through fastening bolt and along the ascending terminal surface fixed connection of footboard main part length direction. Can dismantle the handrail alone, save the storage space of device, be convenient for carry and lay.
Furthermore, the hand-held part and the connecting rod are obliquely arranged, the two ends of the hand-held part in the length direction are respectively provided with an insertion block and an insertion groove, and the cross sections of the insertion block and the insertion groove are matched in shape. The inclined arrangement of the hand-held part is more in line with the requirement of supporting the force during climbing; the arrangement of the insertion block and the insertion groove can connect adjacent handrail units to form a connected whole, so that the safety of the device is enhanced.
According to the technical scheme, the utility model has the advantages of it is following:
this scheme provides an adjustable assembled temporary stair, the device simple structure, be convenient for install and remove, can lay in a flexible way, through the quantity that changes middle footboard, solved the current problem between the not co-structure height, set up adjustable connecting portion and can satisfy the requirement of the different height of marking time, the handrail can be dismantled alone, when guaranteeing device safe and reliable, the turnover of being convenient for has saved the turnover material, has improved the efficiency of construction, has reduced construction cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of a top pedal according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a middle pedal according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a bottom pedal according to an embodiment of the present invention.
Fig. 5 is a partially enlarged view of a portion a in fig. 3.
Fig. 6 is a schematic structural view of a handrail unit according to an embodiment of the present invention.
Fig. 7 is a schematic structural view of a leg body according to an embodiment of the present invention.
Fig. 8 is a schematic structural view of a first connecting sleeve in the embodiment of the present invention.
Fig. 9 is a schematic structural view of a second connection sleeve in the embodiment of the present invention.
In the figure, the pedal comprises a top pedal body 1, a bottom pedal body 2, a middle pedal body 3, an adjustable connecting part I, an adjustable connecting part II, an adjustable connecting part 7, a connecting plate I, an adjustable connecting part 8, a connecting plate II, a connecting plate 9, a through groove 10, a strip-shaped hole I, an adjustable connecting part 11, a strip-shaped hole II, a strip-shaped hole 12, a support leg I, a support leg II, a support leg 14, a stable support leg 15, a support leg body 16, a connecting part 17, a connecting sleeve I, a connecting sleeve 18, a connecting sleeve II, a connecting sleeve 19, a handrail 20, a handrail unit 21, a connecting rod 22, a hand-held part 23, a plug-in block 24 and a plug-in groove.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is obvious that the embodiments described below are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
As shown in fig. 1 to 9, an adjustable assembled temporary stair comprises a top tread 1, a bottom tread 2 and a plurality of middle treads 3, wherein each of the top tread 1, the bottom tread 2 and the middle treads 3 comprises a tread body 4, a first adjustable connecting part 5 and/or a second adjustable connecting part 6 are arranged on each tread body 4, the first adjustable connecting part 5 is arranged on the upper end surface of each tread body 4, the second adjustable connecting part 6 is arranged on the lower end surface of each tread body 4, and two adjacent tread bodies 4 are fixedly connected through the first adjustable connecting part 5 and the second adjustable connecting part 6. As shown in fig. 2 to 4, the first adjustable connecting portion and the second adjustable connecting portion may be provided with strip-shaped holes, or the first adjustable connecting portion 5 or the second adjustable connecting portion 6 may be provided with strip-shaped holes, and the other adjustable connecting portion is provided with a threaded through hole; adopt the footboard main part 4 of frame-type, when guaranteeing 4 structural stability of footboard main part and fastness, alleviateed the weight of footboard main part 4, be convenient for carry and lay.
Wherein, the both ends of middle footboard 3 on its width direction are provided with adjustable connecting portion one 5 and adjustable connecting portion two 6 respectively, and the one end that is close to middle footboard 3 on the footboard 2 of bottom is provided with adjustable connecting portion one 5, and the other end of footboard 2 of bottom is provided with supporting mechanism one, and the one end that is close to middle footboard 3 on footboard 1 of top is provided with adjustable connecting portion two 6, and the other end of footboard 1 of top is fixed with supporting mechanism two. Adjustable connecting portion one, two all set up in footboard main part 4 along its width direction's both ends, are convenient for enlarge the area that footboard main part 4 supplied to trample when guaranteeing adjacent footboard main part 4 connection stability, guarantee the security of work progress.
As shown in fig. 1 to 5, the first adjustable connecting portion 5 comprises two first connecting plates 7, the second adjustable connecting portion 6 comprises two second connecting plates 8, the first connecting plates 7 and the second connecting plates 8 are fixedly connected to the pedal body 1 and are arranged at two ends of the pedal body 1 in the length direction, a first strip-shaped hole 10 extending in the vertical direction is formed in the first connecting plate 7, a second corresponding strip-shaped hole 11 is formed in the second connecting plate 8, and a bolt penetrates through the first strip-shaped hole 10 and the second strip-shaped hole 11 to lock and fix the first adjustable connecting portion 5 and the second adjustable connecting portion 6 which are adjacent to each other. The height between two adjacent pedal bodies 4 can be changed by matching the bolt with the strip-shaped holes I and II, so that the requirements of different step heights are met, the stride of different constructors can be adapted, and the applicability of the device is improved.
In another embodiment, the second connecting plate 8 is further provided with a through groove 9 extending along the length direction of the second connecting plate, and the cross section shape of the through groove 9 is matched with the cross section shape of the first connecting plate 5. The through groove 9 is formed in the second connecting plate 8, the first connecting plate 7 can slide along the through groove 9, the fixing position of the bolt can be adjusted conveniently, meanwhile, the first connecting plate and the second connecting plate can be prevented from being separated, and the reliability of the device is enhanced.
On the other hand, the adjustable fabricated temporary stair further comprises a handrail 19, the handrail 19 comprises a plurality of handrail units 20, the handrail units 20 comprise vertical connecting rods 21, the upper ends of the connecting rods 21 are provided with handholds 22, and the lower ends of the connecting rods 21 extend to the tread body 4 and are fixedly connected with the end faces along the length direction of the tread body 4 through fastening bolts. The handrail 19 can be detached independently, so that the storage space of the device is saved, and the carrying and the arrangement are convenient.
Specifically, as shown in fig. 6, the hand portion 22 and the connecting rod 21 are obliquely arranged, the two ends of the hand portion 22 in the length direction are respectively provided with an insertion block 23 and an insertion groove 24, and the cross-sectional shapes of the insertion block 23 and the insertion groove 24 are matched. The inclined arrangement of the hand holding part 22 is more suitable for the requirement of supporting and borrowing force during climbing; the arrangement of the plug-in block 23 and the plug-in groove 24 can connect the adjacent handrail units 20 to form a connected whole, thereby enhancing the safety of the device.
In another embodiment, the specific structure of the first supporting mechanism and the second supporting mechanism is as follows: the first support mechanism comprises at least two first support legs 12, the first support legs 12 are symmetrically arranged about the center line of the bottom pedal 2, the upper ends of the first support legs 12 are fixedly connected with the bottom pedal 2, and the lower ends of the first support legs are provided with stabilizing support legs 14; the arrangement of the stabilizing support legs 14 can increase the contact area of the supporting mechanism and the ground, and is favorable for improving the stability of the device.
The second supporting mechanism comprises at least two second supporting legs 13, the second supporting legs 13 are symmetrically arranged relative to the center line of the top pedal 1, each second supporting leg 13 comprises a supporting leg main body 15, the lower end of each supporting leg main body 15 is connected with a stabilizing supporting leg 14, and the upper end of each supporting leg main body is fixedly connected with the top pedal 1 through a connecting portion 16. The first support leg 12 can be welded or connected with the bottom pedal 2 in a threaded mode, and the support leg main body 15 can be connected or connected with the stable support leg and the connecting part 16 in a threaded mode; as shown in fig. 2, a connecting sleeve is adopted as a connecting part 16 and is fixed on the top pedal 1, so that the assembly, disassembly and turnover of parts are facilitated; the stability of the device is enhanced, and the device is prevented from overturning when bearing load is uneven.
As shown in fig. 7, the specific structure of the leg body 15 is: the landing leg main body 15 comprises a plurality of first connecting sleeves 17 and second connecting sleeves 18, the first connecting sleeves 17 are arranged at two ends of the landing leg main body 15, and the first connecting sleeves 17 and the second connecting sleeves 18 are arranged in a staggered mode. The two adjacent first connecting sleeves 17 and the two adjacent second connecting sleeves 18 can be in threaded connection as shown in fig. 8 and 9, and can also be in a splicing connection mode, so that the connecting sleeves can be quickly assembled and disassembled, the turnover material is saved, and the turnover utilization of the first connecting sleeves 17 and the second connecting sleeves 18 is facilitated; the height of the landing leg main body can be conveniently adjusted according to different device heights, the connecting sleeves 17 and the connecting sleeves 18 which are arranged in a staggered mode are convenient to improve the connection reliability, and therefore the load bearing capacity of the landing leg main body 15 is enhanced.
The working principle of the adjustable assembled temporary stair is as follows: determining the overall height of the needed temporary stairs according to the construction position and the construction condition, and further determining the number of the needed middle pedals 3; when the pedal is laid, the adjacent middle pedals 3 are connected with the adjustable connecting part II 6 through the adjustable connecting part I5, the middle pedal 3 positioned at the uppermost end is fixedly connected with the adjustable connecting part II 6 on the top pedal 1 through the adjustable connecting part I5 on the upper end surface of the middle pedal 3, the middle pedal 3 positioned at the lowermost end is fixedly connected with the adjustable connecting part I5 on the bottom pedal 2 through the adjustable connecting part II 6 on the lower end surface of the middle pedal 3, and the height between the two adjacent pedal main bodies 4 can be changed by changing the fixing positions of the bolts on the strip-shaped hole I10 and the strip-shaped hole II 11 through the matching of the bolts with the strip-shaped hole I10 and the strip-shaped hole II 11, so that the stride of different constructors is adapted, and the requirements of different stride heights are met; the first support leg 12 on the bottom pedal 2 and the second support leg 13 on the top pedal 1 can support and fix a device, the length of the support leg main body 15 is increased by increasing the number of the first connecting sleeves 17 and the second connecting sleeves 18, and the overall height of the device is matched; a plurality of handrail units 20 set up in the both sides along footboard main part 4 ascending direction of length, and every handrail unit 20 passes through connecting rod 21 detachable and installs on footboard main part 4, and adjacent handrail unit 20 is through grafting piece 23 and inserting groove 24 fixed connection at hand portion 22 both ends, and the dismouting and the transport of being convenient for have saved the turnover material, can realize the turnover utilization of spare part.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings (if any) are used to distinguish relative relationships in position, and are not necessarily qualitative. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides an adjustable assembled interim stair, its characterized in that, includes top footboard, bottom footboard and a plurality of middle footboard, and top footboard, bottom footboard and middle footboard all include the footboard main part, are provided with adjustable connecting portion one and/or adjustable connecting portion two in the footboard main part, and adjustable connecting portion one sets up in the up end of footboard main part, and adjustable connecting portion two sets up in the lower terminal surface of footboard main part, and two adjacent footboard main parts are through adjustable connecting portion one and two fixed connection of adjustable connecting portion.
2. The adjustable assembly type temporary stair of claim 1, wherein the first adjustable connecting portion comprises two first connecting plates, the second adjustable connecting portion comprises two second connecting plates, the first connecting plates and the second connecting plates are both fixedly connected to the pedal body and arranged at two ends along the length direction of the pedal body, the first connecting plates are provided with first strip-shaped holes extending along the vertical direction, the second connecting plates are provided with corresponding second strip-shaped holes, and bolts penetrate through the first strip-shaped holes and the second strip-shaped holes to lock and fix the first adjustable connecting portions and the second adjustable connecting portions which are adjacent to each other.
3. The adjustable assembled temporary staircase according to claim 2, wherein the second connecting plate is further provided with a through groove extending along the length direction thereof, and the cross-sectional shape of the through groove is matched with the cross-sectional shape of the first connecting plate.
4. The adjustable assembly type temporary staircase according to claim 1, wherein the middle tread is provided with a first adjustable connection part and a second adjustable connection part along the two ends of the middle tread in the width direction, the bottom tread is provided with a first adjustable connection part at one end close to the middle tread, the bottom tread is provided with a first support mechanism at the other end, the top tread is provided with a second adjustable connection part at one end close to the middle tread, and the top tread is fixed with a second support mechanism at the other end.
5. The adjustable fabricated temporary staircase according to claim 4, wherein the first support means comprises at least two first support legs, the first support legs are symmetrically arranged about the center line of the bottom tread, the upper ends of the first support legs are fixedly connected with the bottom tread, and the lower ends of the first support legs are provided with stabilizing feet.
6. The adjustable fabricated temporary stair of claim 4, wherein the second support mechanism comprises at least two second support legs, the second support legs are symmetrically arranged about a center line of the top tread, each second support leg comprises a main support leg body, a stabilizing support leg is connected to the lower end of the main support leg body, and the upper end of the main support leg body is fixedly connected with the top tread through a connecting part.
7. The adjustable fabricated temporary staircase of claim 6, wherein the leg body comprises a plurality of first connection sleeves and second connection sleeves, the first connection sleeves are disposed at both ends of the leg body, and the first connection sleeves and the second connection sleeves are staggered.
8. The adjustable fabricated temporary staircase of claim 1, further comprising a handrail including a plurality of handrail units, the handrail units including vertical connecting rods, the upper ends of the connecting rods being provided with handrail portions, the lower ends of the connecting rods extending to the step body and being fixedly connected to end surfaces along the length direction of the step body by fastening bolts.
9. The adjustable assembly type temporary staircase according to claim 8, wherein the handhold portion and the connecting rod are obliquely arranged, the two ends of the handhold portion in the length direction are respectively provided with an insertion block and an insertion groove, and the cross-sectional shapes of the insertion block and the insertion groove are matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123304484.3U CN216840814U (en) | 2021-12-24 | 2021-12-24 | Adjustable assembled temporary stair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123304484.3U CN216840814U (en) | 2021-12-24 | 2021-12-24 | Adjustable assembled temporary stair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216840814U true CN216840814U (en) | 2022-06-28 |
Family
ID=82110266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123304484.3U Active CN216840814U (en) | 2021-12-24 | 2021-12-24 | Adjustable assembled temporary stair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216840814U (en) |
-
2021
- 2021-12-24 CN CN202123304484.3U patent/CN216840814U/en active Active
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Address after: No.63, Yinqueshan Road, Lanshan District, Linyi City, Shandong Province Patentee after: TIANYUAN CONSTRUCTION GROUP Co.,Ltd. Country or region after: China Patentee after: Veterans (Shandong) Construction Group Co.,Ltd. Address before: No.63, Yinqueshan Road, Lanshan District, Linyi City, Shandong Province Patentee before: TIANYUAN CONSTRUCTION GROUP Co.,Ltd. Country or region before: China Patentee before: SHANDONG HONGDA REAL ESTATE Co.,Ltd. |