CN210421399U - Replaceable assembly type frame beam column energy consumption connecting key - Google Patents
Replaceable assembly type frame beam column energy consumption connecting key Download PDFInfo
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- CN210421399U CN210421399U CN201921230308.XU CN201921230308U CN210421399U CN 210421399 U CN210421399 U CN 210421399U CN 201921230308 U CN201921230308 U CN 201921230308U CN 210421399 U CN210421399 U CN 210421399U
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Abstract
The utility model discloses a replaceable assembly type frame beam column energy consumption connecting key, which comprises an end plate, a web plate and a flange plate, wherein the end plate comprises a first end plate and a second end plate which are vertically arranged in parallel; the first end plate is detachably fixed on the frame concrete beam, and the second end plate is detachably fixed on the frame concrete column; the web plate is vertically arranged between the first end plate and the second end plate, and the left end and the right end of the web plate are respectively and fixedly connected with the first end plate and the second end plate in a vertical mode; the upper end and the lower end of the web plate are both provided with flange plates, the flange plates are horizontally arranged, and the left end and the right end of each flange plate are respectively and fixedly connected with the first end plate and the second end plate; the utility model forms an energy consumption connecting key by arranging the web plate and the flange plate between the end plates; the energy-consuming connecting key can provide enough bearing capacity and has the function of ductile deformation and energy consumption, so that the safety of the main body structure is ensured to the maximum extent; the end plates and the frame concrete beam columns are detachably and fixedly connected, so that timely replacement and repair of connecting keys are guaranteed.
Description
Technical Field
The utility model relates to a civil engineering technical field, in particular to removable assembled frame beam column power consumption connecting key.
Background
In the fabricated concrete frame structure, the intersection part of the precast beam and the column member is called a beam column node, also called a beam column core area, and is an important stress part of the structure. The seismic performance of the fabricated building depends on the connection reliability of beam-column nodes to a great extent, the requirement of 'small-earthquake damage prevention, medium-earthquake repairable and large-earthquake collapse' in seismic fortification and the design concept of 'strong nodes and weak members' are met, the requirement of sufficient bearing capacity in small-earthquake is met, the requirement of excellent deformation performance in large-earthquake is met, the seismic input energy is dissipated by the deformation of the connecting keys, and therefore the main body structure is protected.
With the development of the fabricated building, the dry type connecting technology conforms to the trend of the industrialized development of the fabricated building in the future. At present, dry type connection is various, and although the design concept of 'strong node and weak component' can be ensured in the design, the following two defects still exist: (1) the deformation energy consumption and the bearing capacity of the currently developed beam-column dry type connecting node are difficult to be considered, the bearing capacity is insufficient although the beam-column dry type connecting node has better deformation capacity or enough bearing capacity but insufficient deformation capacity in a large earthquake, and the seismic energy of an input structure cannot be dissipated to the maximum extent; (2) the problem of post-earthquake restoration is not considered in the design. After the earthquake, the structure can generate damage of different degrees, especially after a large earthquake occurs, a large amount of cost is needed to detect and reinforce, and if the replacement problem of the structural member is taken into consideration at the beginning of the design, the cost of repairing and reinforcing after the earthquake can be effectively reduced.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model provides a removable assembled frame beam column power consumption connecting key, it has that the ductility is good, bear the weight of when high and power consumption ability is strong, has solved the node and has shaken the back damage and restoreed and change the problem.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a replaceable assembled frame beam column energy consumption connecting key, which comprises an end plate, a web plate and a flange plate, wherein the end plate comprises a first end plate and a second end plate which are vertically arranged in parallel; the first end plate is detachably fixed on the frame concrete beam, and the second end plate is detachably fixed on the frame concrete column; the web plate is vertically arranged between the first end plate and the second end plate, the left end and the right end of the web plate are respectively and fixedly connected with the first end plate and the second end plate in a vertical mode, and a polygonal hole is formed in the middle of the web plate; the upper and lower both ends of web all are provided with the flange board, and the flange board level sets up, both ends respectively with first end plate and the perpendicular fixed connection of second end plate about the flange board.
Further, still include a plurality of fixing bolt, evenly be provided with a plurality of bolt hole on the end plate, fixing bolt wears to establish in the bolt hole, through fixing bolt with end plate and frame concrete beam or frame concrete column fixed connection together.
The connecting sleeve end plate is arranged between the end plate and the frame concrete beam or the frame concrete column; the connecting sleeves are uniformly arranged on the contact surfaces of the connecting sleeve end plates and the frame concrete beams or the frame concrete columns, and the connecting sleeves are matched with the bolt holes in the end plates;
one end of the connecting sleeve is vertically fixed with the connecting sleeve end plate, and a central hole of the connecting sleeve penetrates through the surface of the connecting sleeve end plate; the other end of the connecting sleeve extends into and is fixedly arranged in the frame concrete beam or the frame concrete column; the central hole of the connecting end of the connecting sleeve and the connecting sleeve end plate is provided with internal threads; the fixing bolt penetrates through the end plate and the connecting sleeve end plate in sequence and is in threaded connection with the connecting sleeve.
Furthermore, polygonal holes in the web plates are symmetrically arranged along the vertical central axis of the web plates, the polygonal holes are flat long polygonal holes, and the long axis directions of the flat long polygonal holes are horizontally arranged; the inner angle of the polygonal hole is set to be a rounded angle.
Furthermore, the flat long polygonal hole adopts a quadrilateral hole.
Further, the number of the polygonal holes is one or more, wherein the polygonal holes are uniformly arranged on the web from top to bottom.
Furthermore, the fixing bolt is a high-strength bolt.
Furthermore, the connecting sleeve is made of high-strength materials.
Furthermore, the web plate and the first end plate and the second end plate are fixed by welding; the web plate and the flange plate are fixed by welding.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a replaceable assembly type frame beam column energy consumption connecting key, which provides the bearing capacity required by the node through the combination of end plates, web plates and flange plates; the middle part of the web plate is provided with the polygonal hole, the cross section area of the web plate is weakened, so that the plastic hinge in the structure is arranged at the energy consumption connecting key, the controllability of the plastic hinge position is realized, and the web plate and the flange plate are arranged for energy dissipation; under the action of small vibration, the end plates, the flange plates and the web plates can provide enough bearing capacity so as to ensure the safety of the main body structure of the assembled frame beam column; under the action of a large earthquake, the flange plate drives the web plate to deform and consume energy, and the polygonal hole in the middle of the web plate firstly enters a yield state to consume a part of energy; then the middle part of the flange plate gradually enters a yielding state, a part of energy is consumed, and finally the whole energy-consuming connecting key is completely in the yielding state, so that the energy-consuming connecting key exerts the maximum deformation energy-consuming potential; the utility model can realize the step energy consumption, and reduce the earthquake energy borne by the assembled frame beam column structural member, thereby ensuring the safety of the main body structure to a greater extent; the end plates are detachably and fixedly connected with the frame concrete beam and the frame concrete column, so that the energy-consuming connecting keys are ensured to be replaced and repaired in time; the utility model discloses simple structure, construction convenience, the engineering suitability is strong.
Furthermore, the end plates are connected with the frame concrete beam and the frame concrete column through the fixing bolts, friction is generated between the fixing bolts and the frame concrete beam and the frame concrete column, reliable connection of the energy consumption connecting keys is guaranteed, meanwhile, the energy consumption connecting keys are convenient to replace in time after being damaged, the performance of the assembly type frame structure is guaranteed to recover rapidly, normal work of the structure is guaranteed, the reinforcing cost in the using process of the assembly type frame structure is reduced, and dismantling and rebuilding of the assembly type frame structure are avoided.
Furthermore, the web plate is provided with the polygonal holes which are symmetrical left and right, the polygonal holes adopt the flat long polygonal holes to effectively weaken the cross sectional area of the web plate, and the controllability of the position of the plastic hinge is realized; the inner corners of the polygonal holes are set to be the rounded corners, so that the stress concentration of the corners of the polygonal holes is effectively avoided, and the uniformity of deformation and energy consumption of the web is ensured.
Furthermore, one or more polygonal holes are adopted, so that different deformation energy consumption requirements are met, the material consumption of the energy consumption connecting key is saved, and the self weight of the structure is reduced.
Furthermore, the connecting sleeves are pre-embedded in the frame concrete beam and the frame concrete column, so that reliable anchoring conditions are provided for fixing bolts, and the bearing capacity of the energy-consuming connecting key is improved.
Furthermore, the polygonal hole is formed in the center of the web plate, the area of the cross section of the web plate is weakened, and the plastic hinge is arranged at the energy consumption connecting key due to the node, so that the controllability of the position of the plastic hinge is realized.
Drawings
Fig. 1 is a schematic perspective view of a replaceable assembled frame beam-column energy-consuming connecting key according to the present invention;
fig. 2 is a schematic front structural view of the replaceable fabricated frame beam-column energy-consuming connecting key of the present invention;
fig. 3 is a schematic cross-sectional view of the replaceable fabricated frame beam-column energy-consuming connecting key according to the present invention;
fig. 4 is an assembly process schematic diagram of the replaceable fabricated frame beam-column energy consumption connecting key of the present invention.
The concrete beam comprises an end plate 1, a web plate 2, a flange plate 3, a connecting sleeve end plate 4, a fixing bolt 5, a connecting sleeve 6, a frame concrete beam 7 and a frame concrete column 8; 11 a first end plate, 12 a second end plate; 31 first flange plate, 22 second flange plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in the accompanying drawings 1-3, the utility model provides a prefabricated frame structure beam column power consumption connecting key, including end plate 1, web 2, flange board 3, adapter sleeve end plate 4, a plurality of fixing bolt hole 5 and a plurality of adapter sleeve 6.
The end plate 1 comprises a first end plate 11 and a second end plate 12 which are vertically arranged in parallel, the first end plate 11 is detachably fixed on the frame concrete beam 7, and the second end plate 12 is detachably fixed on the frame concrete column 8; the web 2 is vertically arranged between the first end plate 11 and the second end plate 12, and the left end and the right end of the web 2 are respectively and vertically welded and fixed with the first end plate 11 and the second end plate 12; the upper and lower both ends of web 2 all are provided with flange plate 3, and the 3 level settings of flange plate, perpendicular welded fastening between the surface of flange plate 3 and the web 2, the both ends of flange plate 3 respectively with first end plate 11 and the perpendicular welded fastening of second end plate 12.
The polygonal hole is formed in the center of the web 2, so that the bearing capacity of the center section of the web 2 is weakened, the deformation transfer of the energy consumption connecting key is guaranteed, the energy consumption key is centralized, and the brittle failure of an energy consumption node is avoided.
Evenly be provided with a plurality of bolt hole on the end plate 1, fixing bolt 5 wears to establish in the bolt hole, through fixing bolt 5 with end plate 1 and frame concrete roof beam 7 or 8 fixed connection of frame concrete column.
A connecting sleeve end plate 4 is arranged between the end plate 1 and the frame concrete beam 7 or the frame concrete column 8, a plurality of connecting sleeves 6 are uniformly arranged on the contact surface of the connecting sleeve end plate 4 and the frame concrete beam 7 or the frame concrete column 8, and the connecting sleeves 6 are matched with the bolt holes on the end plate 1; one end of the connecting sleeve 6 is vertically welded and fixed with the connecting sleeve end plate 4, and a central hole of the connecting sleeve 6 penetrates through the surface of the connecting sleeve end plate 4; the other end of the connecting sleeve 6 extends into and is fixedly arranged in a frame concrete beam 7 or a frame concrete column 8; the central hole of the connecting end of the connecting sleeve 6 and the connecting sleeve end plate 4 is provided with internal threads; the fixing bolt 5 sequentially penetrates through the end plate 1 and the connecting sleeve end plate 4 and is in threaded connection with the connecting sleeve 6; one end of the connecting sleeve 6 is pre-buried in the frame concrete beam 7 or the frame concrete column 8, and the other end of the connecting sleeve is welded and fixed with the connecting sleeve end plate 4, so that reliable anchoring is provided for the installation of the fixing bolt 5 and the frame concrete beam 7 or the frame concrete column 8.
Examples
The utility model provides a prefabricated frame structure beam column energy consumption connecting key, which is of a pure steel structure; the end plate 1 comprises a first end plate 11 and a second end plate 12, wherein two ends of the first end plate and the second end plate are arranged in parallel, and the end plate 1 is made of Q345 steel; the web 2 is vertically arranged between the first end plate 11 and the second end plate 12, the web 2 is made of Q345 steel, and two ends of the web 2 are respectively and vertically welded and fixed with the first end plate 11 and the second end plate 12; the flange plates 3 are horizontally arranged at the upper end and the lower end of the web plate 2, and the flange plates 3 are fixed with the end plates 1 and the web plate 2 by welding; the end plates 1, the web plates 2 and the flange plates are combined to form an energy-consuming connecting key, so that sufficient bearing capacity is provided for the frame beam column, and the safety of the structure is ensured; under the action of small vibration, the end plates, the flange plates and the web plates can provide enough bearing capacity so as to ensure the safety of the main body structure of the assembled frame beam column.
A polygonal hole is formed in the middle of the web 2, the polygonal holes are symmetrically arranged along the vertical central axis of the web 2, the polygonal hole is a flat long polygonal hole, and the long axis of the flat long polygonal hole is arranged in the horizontal direction; the number of the polygonal holes is one or more, wherein the polygonal holes are uniformly arranged on the web 2 from top to bottom; by adopting the polygonal holes, the cross section area of the web plate 2 is weakened, and the plastic hinge appears at the energy consumption connecting key, so that the controllability of the plastic hinge position is realized; the inner angles of the polygonal holes are all set to be rounded corners, so that the stress concentration of the corners of the polygonal holes is effectively avoided, and the deformation uniformity of the web plate is ensured; preferably, the polygonal hole is a flat-long quadrilateral hole.
Evenly be provided with a plurality of bolt hole on the end plate 1, the bolt hole is evenly laid along the length direction of end plate 1, and the symmetry sets up the both sides at web 2. The fixing bolt 5 is a high-strength bolt, and the fixing bolt 5 sequentially penetrates through the end plate 1 and the connecting sleeve end plate 4 and is fixedly connected with the connecting sleeve 6; the stable and reliable connection of the end plate 1 and the frame concrete beam 7 or the frame beam 9 is realized through the fixing bolt 5, and the rotation of the end plate 1 is avoided; meanwhile, the energy-consumption connecting key is detachably connected with the frame concrete beam 7 or the frame concrete column 8 through the fixing bolt 5, and the energy-consumption connecting key is convenient to replace or repair in time. When the assembled frame structure encounters a large earthquake or other sudden loads, the assembled frame structure is most seriously damaged or deformed at the energy consumption connecting key, and when the structure is repaired, the energy consumption connecting key can be directly taken down for replacement only by detaching the fixing bolt 5, so that the performance of the assembled frame structure can be quickly recovered, and the normal work of the structure is realized.
The connecting sleeve 6 is made of high-strength steel materials, one end of the connecting sleeve 6 is vertically welded and fixed with the connecting sleeve end plate 4, the other end of the connecting sleeve is embedded in the frame concrete beam 7 or the frame concrete column 8, and the length of the connecting sleeve 6 meets the requirement of the anchoring length of the connecting sleeve; a reliable anchoring of the fixing bolt 5 is provided by the connecting sleeve end plate 4 and the connecting sleeve 6, ensuring a reliable transmission of forces.
Assembly process
As shown in the attached figure 4, the assembly process of the energy-consuming connecting key of the assembled frame structure beam column of the utility model comprises the following steps:
step 4, hoisting the energy-consuming connecting key in a node area of a frame concrete beam 7 and a frame concrete column 8, fixedly connecting the energy-consuming connecting key to the frame concrete beam 7 and the frame concrete column 8 which are provided with a connecting sleeve 6 and a connecting sleeve end plate 4 by using a fixing bolt 5, and screwing the fixing bolt 5; the friction force between the connecting sleeve 6 and the concrete realizes the effective connection between the connecting sleeve 6 and the frame concrete beam 7 and the frame concrete column 8, so that the energy-consuming connecting key, the frame concrete beam 7 and the frame concrete column 8 form a whole.
Principle of operation
The utility model relates to a replaceable assembly type frame beam column energy consumption connecting key, which reliably connects a flange plate with a first end plate and a second end plate through a web plate, thereby ensuring higher bearing capacity of the energy consumption connecting key; by arranging the polygonal holes on the web plate, under the action of seismic load, stress is mainly distributed on two sides of the polygonal opening of the web plate, and the web plate at the polygonal opening firstly enters a yield state along with the gradual increase of the stress, so that a part of energy is consumed; energy consumption deformation is continuously carried out, when the web plate fully enters a yield state, stress is gradually transferred to the middle of the flange plate, and then the flange plate enters the yield state to consume a part of energy; finally, the whole cross section of the energy-consuming connecting key is in a yield state, so that the energy-consuming connecting key fully shows excellent energy-consuming capacity; the utility model discloses in through set up a plurality of polygon holes in the middle of the web, the web that is favorable to between each polygon hole can both be even and abundant production warp, has improved the deformability of power consumption connecting key, has improved the power consumption effect of power consumption connecting key.
The energy-consuming connecting key for the assembled frame structure beam column can provide enough bearing capacity by the end plates, the flange plates and the web plates under the action of small earthquake so as to ensure the safety of the main body structure of the assembled frame beam column; under the action of a large earthquake, the flange plate drives the web plate to deform and consume energy, and the polygonal hole in the middle of the web plate firstly enters a yield state to consume a part of energy; then the middle part of the flange plate gradually enters a yielding state, a part of energy is consumed, and finally the whole energy-consuming connecting key is completely in the yielding state, so that the energy-consuming connecting key exerts the maximum deformation energy-consuming potential; the utility model can realize the step energy consumption, and reduce the earthquake energy borne by the assembled frame beam column structural member, thereby ensuring the safety of the main body structure to a greater extent; the energy-consuming connecting key is fixedly connected with the frame concrete beam 7 and the frame concrete column 8 through the high-strength bolt, and when a large earthquake occurs, the energy-consuming connecting key is subjected to energy-consuming yielding before the frame concrete beam 7 or the frame concrete column 8, so that the overall stability of the assembly type frame structure is ensured.
After assembled frame construction receives the earthquake influence, through dismantling fixing bolt, can realize the change to this power consumption connection key, realized quick recovery assembled frame construction's performance, guarantee assembled frame construction's normal work, reduced the reinforced cost of back gas or avoided assembled frame construction to demolish the reconstruction, power consumption connection key construction simple and convenient, low in cost, engineering practicality are strong.
The above description is only illustrative of the preferred embodiments of the present invention, and any variations, modifications, decorations, etc. may be made without departing from the principle of the present invention, and these variations, modifications, decorations, etc. are all considered to be within the scope of the present invention.
Claims (9)
1. A replaceable assembly type frame beam column energy consumption connecting key is characterized by comprising an end plate (1), a web plate (2) and a flange plate (3), wherein the end plate (1) comprises a first end plate (11) and a second end plate (12) which are vertically arranged in parallel; the first end plate (11) is detachably fixed on the frame concrete beam (7), and the second end plate (12) is detachably fixed on the frame concrete column (8); the web (2) is vertically arranged between the first end plate (11) and the second end plate (12), the left end and the right end of the web (2) are respectively and fixedly connected with the first end plate (11) and the second end plate (12) in a vertical mode, and a polygonal hole is formed in the middle of the web (2); the upper end and the lower end of the web plate (2) are respectively provided with a flange plate (3), the flange plates (3) are horizontally arranged, and the left end and the right end of each flange plate (3) are respectively and fixedly connected with the first end plate (11) and the second end plate (12) in a perpendicular mode.
2. The replaceable assembled frame beam column energy consumption connecting key is characterized by further comprising a plurality of fixing bolts (5), a plurality of bolt holes are uniformly formed in the end plate (1), the fixing bolts (5) penetrate through the bolt holes, and the end plate (1) is fixedly connected with the frame concrete beam (7) or the frame concrete column (8) through the fixing bolts (5).
3. A replaceable fabricated frame beam column energy consumption connection key according to claim 2, characterized by further comprising a connection sleeve end plate (4) and a plurality of connection sleeves (6), wherein the connection sleeve end plate (4) is arranged between the end plate (1) and the frame concrete beam (7) or the frame concrete column (8); a plurality of connecting sleeves (6) are uniformly arranged on the contact surfaces of the connecting sleeve end plates (4) and the frame concrete beams (7) or the frame concrete columns (8), and the connecting sleeves (6) are matched with the bolt holes on the end plates (1);
one end of the connecting sleeve (6) is vertically fixed with the connecting sleeve end plate (4), and a central hole of the connecting sleeve (6) penetrates through the surface of the connecting sleeve end plate (4); the other end of the connecting sleeve (6) extends into and is fixedly arranged in a frame concrete beam (7) or a frame concrete column (8); the central hole of the connecting end of the connecting sleeve (6) and the connecting sleeve end plate (4) is provided with internal threads; the fixing bolt (5) sequentially penetrates through the end plate (1) and the connecting sleeve end plate (4) and is in threaded connection with the connecting sleeve (6).
4. The replaceable assembled type frame beam-column energy consumption connecting key is characterized in that the polygonal holes in the web plate (2) are symmetrically arranged along the vertical central axis of the web plate (2), the polygonal holes are flat long polygonal holes, and the long axis directions of the flat long polygonal holes are horizontally arranged; the inner angle of the polygonal hole is set to be a rounded angle.
5. The replaceable fabricated frame beam-column power dissipating connection of claim 4, wherein the oblong hole is a quadrilateral hole.
6. A replaceable fabricated frame beam column power consumption connecting key according to claim 4, characterized in that the number of the polygonal holes is one or more, wherein the polygonal holes are uniformly arranged on the web (2) from top to bottom.
7. A replaceable fabricated frame beam column energy-consuming connecting key according to claim 1, characterized in that the fixing bolt (5) is a high-strength bolt.
8. A replaceable fabricated frame beam column energy consuming connection key as claimed in claim 3, wherein the connection sleeve (6) is made of high strength material.
9. A replaceable fabricated frame beam-column energy consumption connecting key according to claim 1, characterized in that the web (2) and the first end plate (11) and the second end plate (12) are fixed by welding; the web plate (2) and the flange plate (3) are fixed by welding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921230308.XU CN210421399U (en) | 2019-07-31 | 2019-07-31 | Replaceable assembly type frame beam column energy consumption connecting key |
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| CN201921230308.XU CN210421399U (en) | 2019-07-31 | 2019-07-31 | Replaceable assembly type frame beam column energy consumption connecting key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359553A (en) * | 2019-07-31 | 2019-10-22 | 西安建筑科技大学 | A kind of replaceable assembling frame beam column energy consumption connecting key |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110359553A (en) * | 2019-07-31 | 2019-10-22 | 西安建筑科技大学 | A kind of replaceable assembling frame beam column energy consumption connecting key |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: CHINA RAILWAY FIRST GROUP CO.,LTD. CONSTRUCTION & INSTALLATION ENGINEERING CO.,LTD. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2021980012947 Denomination of utility model: A replaceable frame beam column energy dissipation connection key Granted publication date: 20200428 License type: Common License Record date: 20211122 Assignee: Shaanxi Nitya New Materials Technology Co.,Ltd. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2021980012797 Denomination of utility model: A replaceable frame beam column energy dissipation connection key Granted publication date: 20200428 License type: Common License Record date: 20211119 |
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| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Shaanxi Nitya New Materials Technology Co.,Ltd. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2021980012797 Date of cancellation: 20240320 |
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| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: CHINA RAILWAY FIRST GROUP CO.,LTD. CONSTRUCTION & INSTALLATION ENGINEERING CO.,LTD. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2021980012947 Date of cancellation: 20240410 |