CN210482577U

CN210482577U - A prop up top circulation system for three-dimensional prefabricated full assembled concrete structure

Info

Publication number: CN210482577U
Application number: CN201921268314.4U
Authority: CN
Inventors: 杨秀敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-05-08
Anticipated expiration: 2029-08-07

Abstract

The utility model relates to a supporting roof circulation system for three-dimensional prefabricated full assembled concrete structure. Use the utility model discloses during the prefabricated full assembled concrete structure, the concrete structure on every layer all uses assurance concrete structure node core space complete as the prerequisite, divides into a plurality of prefabricated units, on guaranteeing the smooth and easy basis of dismouting between each prefabricated unit on every layer, and the dismouting between the corresponding prefabricated unit on lower floor can also be guaranteed smoothly. And (4) matching with a liftable supporting top circulating system, and performing prefabrication from bottom to top until the highest layer of a design project. The prefabricated units divided according to the core area of the concrete structure node are convenient to build, the strength of the core area of the node can be directly improved, and the anchoring and connecting strength of the reinforcing steel bars can be indirectly improved. To sum up, through the utility model discloses can realize that the mill is prefabricated and the on-the-spot phase separation of assembling, realize "reliably give the mill, give the purpose of on-the-spot to the convenience, finally ensure the reliability and the convenience of full assembled concrete structure.

Description

A prop up top circulation system for three-dimensional prefabricated full assembled concrete structure

Technical Field

The utility model relates to a building field, concretely relates to a back-up circulation system for three-dimensional prefabricated full assembled concrete structure.

Background

The fabricated concrete structure is the mainstream structure of the fabricated building due to its irreplaceable superiority. Through decades of efforts of modern human beings, the prefabricated concrete structure is continuously developed, particularly, a routine service meeting of the national academy of state in 2016 determines to vigorously develop the prefabricated building, so that the adjustment and the upgrade of the industrial structure are promoted, and the guidance suggestion about the vigorous development of the prefabricated building is issued, so that the Chinese-style prefabricated concrete structure is greatly developed and improved.

The prefabrication method of the prefabricated concrete structure adopts two-dimensional plane prefabrication, the concrete structure is split in the most important node core area, the integrity of the node core area is damaged, and the reliability of the node core area is reduced by assembling and connecting after prefabrication; meanwhile, the two-dimensional plane prefabrication also brings about difficulty in connection of a plurality of steel bars in three-dimensional assembly. We consider that: the component products produced by the factory are good, the factory production and the field installation are environment-friendly and meaningful for a long time; the production mode is greatly improved; but most production modes are simple, and the produced products cannot be constructed conveniently basically; the construction results are subject to constant disputes, with the main negative view of being unreliable, cumbersome, expensive, even in advanced countries and regions such as the united states, japan, singapore and hong kong of china, which is the inevitable consequence of two-dimensional planar prefabricated three-dimensional installations.

In view of the above technical problems, there is an urgent need to develop a completely new method for prefabricating a three-dimensional fully-fabricated concrete structure to ensure the reliability of the node core region after the fabricated concrete structure is assembled and connected and the reliability of the steel bar anchoring and connection in the concrete structure, so that the fabricated concrete structure with the structure seismic performance stronger than that of a cast-in-place concrete structure can be built under the condition of ensuring the two, and meanwhile, the assembly rate of the fabricated concrete structure can be greatly improved to 99 percent from below 50 percent, namely, the fabricated concrete structure is fully assembled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a supporting top circulation system for three-dimensional prefabricated full assembled concrete structure adopts the insecure technical problem of two-dimensional plane prefabricated concrete structure post-assembly structure in order to solve among the prior art.

In order to achieve the above object, the utility model discloses a technical scheme that a supporting roof circulation system that is used for three-dimensional prefabricated full assembled concrete structure adopts is:

a supporting top circulating system for a three-dimensional prefabricated full-assembled concrete structure comprises a construction platform and a supporting top assembly for supporting the construction platform, wherein the supporting top assembly comprises a hollow lower oil cylinder section, an oil cylinder movable section capable of ascending and descending is inserted in the hollow upper oil cylinder section, a movable support is installed at the top end of the oil cylinder movable section, a conversion support is installed at the top end of the lower oil cylinder section, the conversion support is provided with a through hole from which the oil cylinder movable section extends, the lower end of the movable support is provided with a groove, the cross section of the groove is matched with the cross section of the oil cylinder movable section, the movable support is detachably sleeved at the top end of the oil cylinder movable section through the groove, the size of the through hole is smaller than that of the lower end of the movable support, the middle part of the conversion support is provided with a containing groove for containing the movable support and taking out the movable support from the side, and the, the upper end face of the movable support bracket is provided with a second supporting face, the first supporting face is parallel to the second supporting face, and the construction platform is provided with an avoiding hole for the oil cylinder movable section without the movable support bracket to penetrate through.

The conversion support comprises a connecting part and two side supporting parts, the conversion support is installed at the top end of the lower section of the oil cylinder through the connecting part, the two side supporting parts are arranged at intervals, the two side supporting parts are symmetrically arranged on the left side and the right side of the connecting part, the first supporting surface is formed at the upper end faces of the two side supporting parts, the through hole is formed in the connecting part, and the two side supporting parts and the through hole are completely staggered so as not to influence the lifting of the movable section of the oil cylinder.

The second bearing surface is of an elongated structure, and the interval between the two side bearing parts is larger than the width of the second bearing surface to form the accommodating groove.

The connecting part comprises a cylindrical structure, the front side and the rear side of the cylindrical structure are symmetrically provided with a splitting groove, the upper end of the splitting groove is open, and the width of the splitting groove is larger than that of the second supporting surface so as to form the accommodating groove.

The lower end of the connecting part is provided with a connecting groove which is matched with the top end of the lower section of the oil cylinder in shape and is sleeved at the top end of the lower section of the oil cylinder.

The lower section of the oil cylinder is a fixed part of the oil cylinder, the movable section of the oil cylinder is a piston rod part of the oil cylinder, and a plurality of groups of supporting assemblies are arranged.

The utility model has the advantages that: use the utility model discloses during prefabricated full assembled concrete structure, the prefabricated unit of concrete structure on every layer is divided, all uses assurance node core space complete as the prerequisite, and a plurality of concrete structure prefabricated unit on complete layer is prefabricated through the construction platform who builds complete layer, and the dismouting is smooth and easy between the prefabricated unit. Meanwhile, the concrete structure close to the upper layer is prefabricated by taking the concrete structure close to the lower layer as a reference, and the concrete structures of the two adjacent layers are prefabricated on the construction platform, so that the smooth assembly and disassembly between the corresponding prefabricated units of the upper layer and the lower layer can be ensured. And (3) the prefabricated concrete roof is prefabricated from bottom to top by matching with a liftable supporting top circulating system until the highest layer of the design project, and the total number of the highest layer can be completely the same as that of the cast-in-place concrete structure. The prefabricated units divided on the premise of ensuring the completeness of the core area of the concrete structure node are convenient to build, the strength of the core area of the node can be directly improved, the anchoring and connecting strength of the reinforcing steel bars can be indirectly improved, and the fabricated concrete structure with the structure anti-seismic performance stronger than that of a cast-in-place concrete structure can be built. Meanwhile, even complex parts such as an elevator shaft, a core barrel and the like are prefabricated and assembled according to the same method, the assembly rate of the prefabricated concrete structure can be greatly improved to 99 percent from the existing below 50 percent, namely, the prefabricated concrete structure is completely assembled. To sum up, through the utility model discloses can realize that the mill is prefabricated and the on-the-spot phase separation of assembling, realize "reliably give the mill, give the purpose of on-the-spot to the convenience, finally ensure the reliability and the convenience of full assembled concrete structure.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a supporting top circulation system for a prefabricated concrete structure according to the present invention, in which an active section of a cylinder is lowered to the bottom;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a schematic structural view of a support top circulation system for a prefabricated concrete structure in a three-dimensional manner shown in fig. 1, with a construction platform and a movable support removed;

fig. 4 is a schematic structural diagram of the movable section of the oil cylinder in fig. 1 when the movable section rises to a first state.

Fig. 5 is a schematic structural diagram of an embodiment of a supporting top circulation system for a prefabricated concrete structure according to the present invention, in which a plurality of supporting top assemblies are arranged, when the movable section of the cylinder is raised to a second state.

Fig. 6 is a schematic structural view illustrating the movable section of the cylinder in fig. 5 raised above the second state and the first concrete structure and the first construction platform are removed.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The utility model discloses an embodiment that is used for three-dimensional prefabricated full assembled concrete structure's a top circulation system:

the utility model discloses a supporting roof circulation system for three-dimensional prefabricated full assembled concrete structure, including the supporting roof subassembly that is used for three-dimensional prefabricated concrete structure's construction platform and is used for supporting construction platform. The specific structure of the supporting top assembly is shown in fig. 1 to 4, and comprises a hollow lower cylinder section 1, a cylinder moving section 2 capable of lifting up and down is inserted in the lower cylinder section 1, a conversion support 3 is installed at the upper end of the lower cylinder section 1, a through hole 31 for the cylinder moving section 2 to extend out is formed in the middle of the conversion support 3, a moving support 4 is sleeved at the upper end of the cylinder moving section 2, and a holding groove 33 for holding the moving support 4 and allowing the moving support 4 to be detached from the side face of the conversion support 3 is formed in the middle of the conversion support 3. The upper end surface of the transition lug 3 has a first bearing surface 32, the upper end surface of the movable lug 4 has a second bearing surface 41, and the first bearing surface 32 is parallel to the second bearing surface 41.

The construction platform 5 is of a frame type steel structure, and the construction platform 5 of the frame type steel structure can be used as a support for each prefabricated unit manufacturing stage of the horizontal component and can be used for extending out of the oil cylinder movable section 2 without the movable support 4.

In this embodiment, the converting bracket 3 includes a connecting portion 34 and a side supporting portion 35. The connecting portion 34 is formed by splitting grooves with upper openings symmetrically formed at the front and rear ends of the cylinder, the two side supporting portions 35 are symmetrically disposed at the left and right sides of the connecting portion 34, and the upper end surfaces of the two side supporting portions 35 form the first supporting surface 32. The lower end of the connecting part 34 is provided with a connecting groove matched with the upper end of the lower oil cylinder section 1 in shape so as to be sleeved at the upper end of the lower oil cylinder section 1, and the converting support bracket 3 is arranged at the upper end of the lower oil cylinder section 1 through the connecting part 34.

The lower end of the movable support 4 is provided with a groove, the shape of the cross section of the groove is matched with the shape of the cross section of the oil cylinder movable section 2, the movable support 4 is sleeved at the upper end of the oil cylinder movable section 2 through the groove, and the movable support 4 must be detached before the oil cylinder movable section 2 rises. The size of the through hole 31 is smaller than that of the lower end of the movable support 4, when the oil cylinder movable section 2 descends to the bottom of the upper construction platform 5 and contacts with the first supporting surface 32 of the conversion support 3, the conversion support 3 supports the descending upper construction platform 5, and the movable support 4 is separated from the upper construction platform 5; when the oil cylinder movable section 2 descends again, the lower end of the movable support 4 is contacted with the top surface of the through hole 31 of the conversion support 3; when the oil cylinder movable section 2 continuously descends to the top end of the oil cylinder movable section 2 lower than the top surface of the through hole 31 of the conversion support 3, the movable support 4 is separated from the oil cylinder movable section 2, and the movable support 4 can be taken out in a translation mode from the side surface.

The second support surface 41 is of a long structure, and the area of the second support surface is larger than that of the upper end of the cylinder movable section 2. The width of the cleavage groove is larger than the width of the second support surface 41 to form the receiving groove 33. The through hole 31 is arranged on the connecting part 34, and the two side supporting parts 35 arranged on the outer side surface of the connecting part 34 are completely staggered from the through hole 31, so that the lifting of the oil cylinder movable section 2 is not influenced.

In other embodiments, the connecting portion may be a ring-shaped structure, and the side supporting portions are spaced apart from each other on both sides of the connecting portion, so that the receiving groove 33 is formed by ensuring that the distance between the side supporting portions is greater than the width of the second supporting surface 41, but the whole of the converting bracket 3 has enough bearing capacity.

When the first layer concrete structure is manufactured, the state of the supporting top circulating system can be as shown in fig. 1, the movable support 4 is not in the accommodating groove 33 (or the movable section 2 of the oil cylinder can be in a state of being lifted to any height above the floor surface of the first layer concrete structure), a first layer construction platform 51 is built on the first supporting surface 32, and the first layer concrete structure is manufactured on the first layer construction platform 51; after the first layer of concrete structure is manufactured, the oil cylinder movable section 2 is lifted to a first state (above the floor surface of the first layer of concrete structure), the movable support bracket 4 is installed at the top end of the oil cylinder movable section 2, the oil cylinder movable section 2 is continuously lifted to a second state (under the state, the distance between the floor surface of the first layer of concrete structure and the floor surface of the second layer of concrete structure can be ensured to be equal to the floor height of the second layer), the second layer of construction platform 52 is built on the second supporting surface 41, and the second layer of concrete structure is manufactured on the second layer of construction platform 52. The structure of the propping circulation system after the second layer of construction platform 52 is built is shown in fig. 4.

When the first layer concrete structure is manufactured, all prefabricated units of all vertical components of the first layer concrete structure, including vertical steel bars and large threaded heads thereof extending upwards from a floor slab, are integrally manufactured according to the requirements of deepened design of a construction drawing, so that the node core area of the first layer concrete structure is ensured to be complete and serves as a reference for manufacturing the second layer concrete structure. And the rest can be done in the same way.

After the second concrete structure is manufactured, the first construction platform 51 and the first concrete structure thereon need to be removed. The specific operation steps are as follows: firstly, disassembling a connecting sleeve between the second layer concrete structure and the first layer concrete structure, and erecting the second layer concrete structure and the first layer concrete structure in an arc mode; then the movable section 2 of the oil cylinder is continuously lifted to a higher position above the second state, and at the moment, the second layer of construction platform 52 is completely separated from the first layer of concrete structure; then, the first layer of concrete structure and the first layer of construction platform 51 are both dismounted from the conversion support 3; finally, when the bottom of the second layer of construction platform 52 from the movable section 2 of the descending oil cylinder contacts the first supporting surface 32 of the conversion support 3, the conversion support 3 supports the descending second layer of construction platform 52, and the movable support 4 is separated from the second layer of construction platform 52; when the oil cylinder movable section 2 descends again, the lower end of the movable support 4 is contacted with the top surface of the through hole 31 of the conversion support 3; when the oil cylinder movable section 2 continuously descends to the top end of the oil cylinder movable section 2 which is lower than the top surface of the through hole 31 of the conversion support bracket 3, the movable support bracket 4 is separated from the oil cylinder movable section 2, the movable support bracket 4 is horizontally moved and taken out, a working cycle is completed, and preparation is made for building a third-layer construction platform.

The jacking assemblies are arranged in groups which together support the construction platform 5, as shown in figures 5 and 6.

In a more preferable embodiment, the lower section 1 of the oil cylinder is a fixed seat part of the oil cylinder, the movable section 2 of the oil cylinder is a piston rod part of the oil cylinder, and the used oil cylinder is a two-stage oil cylinder with two sections of stable extension distances.

Use the utility model discloses step when three-dimensional prefabricated full assembled concrete structure is as follows:

the method is used for realizing the three-dimensional prefabrication of a concrete structure, the core area of the three-dimensional prefabricated concrete structure node has high strength and high connection strength of reinforcing steel bars, an assembled concrete structure with the structure anti-seismic performance stronger than that of a cast-in-place concrete structure can be built under an ideal condition, and the overall strength of the assembled building can be stronger than that of the cast-in-place building. Specifically, the method comprises the following steps:

firstly, a supporting and circulating system including a construction platform is built in a prefabricated factory building or on a flat ground.

And secondly, prefabricating the concrete structure on the construction platform layer by layer. The method specifically comprises the following steps:

step 201, firstly, a first layer of concrete structure is built on a first layer of construction platform, a second layer of concrete structure is built on a second layer of construction platform, and when the second layer of concrete structure is built, the first layer of concrete structure is taken as a reference, and vertical steel bars of the second layer are pre-connected with vertical steel bars of the first layer;

step 202, a first layer of concrete structure is disassembled from the lower part of a second layer of concrete structure, namely, a second layer of construction platform is jacked up through a supporting and jacking circulating system, and the first layer of concrete structure together with the first layer of construction platform is disassembled from the supporting and jacking circulating system;

step 203, lowering a second-layer construction platform including a second-layer concrete structure to the position of the original first-layer construction platform through a supporting and circulating system and replacing a support;

step 204, raising the upper section of the supporting and jacking circulation system by one layer again, building a third layer of construction platform above the lowered second layer of concrete structure, and building a third layer of concrete structure on the third layer of construction platform by taking the second layer of concrete structure as a reference;

and step 205, circulating the steps of detaching the next layer of concrete structure and the next layer of construction platform, descending the previous layer of construction platform including the previous layer of concrete structure, and upwards continuously building the previous layer of construction platform and building the next layer of concrete structure by taking the previous layer of construction platform as a reference until the Nth layer of concrete structure of the highest layer is built.

After step 205, the concrete structures of each layer may be removed and maintained and stored for transportation to an engineering assembly site for assembly when needed.

In the second step, each layer of concrete structure is built and comprises a plurality of prefabricated units divided according to the node core area, and the prefabricated units are divided in the construction drawing deepening design stage. When dividing the prefabricated units, the following matters need to be noted: firstly, dividing around a node core area on the basis of keeping the integrity of the node core area; secondly, the hoisting and transferring capability of the prefabricated units is considered, and the weight of the prefabricated units can be controlled to be about 200 KN. Thirdly, the size of the reserved gap between two adjacent prefabricated units is considered, and is generally controlled to be 230-260 mm.

In this embodiment, the weight of the prefabricated unit is controlled to be about 200KN, mainly because if the prefabricated unit is too small, it is not favorable for ensuring that the node core area is completely divided, a certain volume and weight are required, and if the prefabricated unit is too small, more connecting parts are increased; if the tower crane is too large, the tower crane is not beneficial to hoisting and transferring, and the hoisting capacity of the existing large tower crane is below 10000KNm to the maximum, namely the tower crane lifts 200KN and extends out for 50 m. As lifting equipment and state of the art advance and transportation conditions are better, in other embodiments the prefabricated units can also be made larger and heavier.

In the embodiment, the size of the reserved gap between two adjacent prefabricated units is controlled to be 230-260 mm, firstly, the reserved gap needs to be penetrated when the oil cylinder moving section of the supporting and jacking circulating system rises, the diameter of the oil cylinder moving section needs to be 240mm, and the reserved gap can be used as an avoiding gap. Secondly, because the steel bar sleeves are pre-connected to each prefabricated unit before concrete is poured, the steel bar sleeves are unscrewed to disassemble the prefabricated units after the concrete is poured and solidified, and the prefabricated units are also used as installation seams to reconnect the steel bar sleeves during field assembly, the steel bar sleeves are pre-connected, unscrewed and reconnected by using special tools, and the operation interval of the special tools is about 230 mm; and thirdly, after the steel bars of the unit blocks are connected, the unit blocks are poured with new concrete to form an integral structure, the reserved seams are used as post-pouring belts, if the reserved seams are too large, the pouring amount of the on-site concrete is increased, and the assembly rate of the fully-assembled concrete structure is reduced.

In this step, in order to avoid the difficulty in distinguishing after the splitting, it is necessary to number each prefabricated unit before splitting the concrete structure of the corresponding layer.

When the prefabricated units are manufactured, the thread big ends with the diameters larger than the diameter of the base material of the steel bar are processed on the connecting end steel bars corresponding to the two mutually connected prefabricated units, after one prefabricated unit is manufactured, the thread big ends of the two prefabricated units are firstly connected together in advance through the sleeve, then concrete of the other prefabricated unit is poured, or after the prefabricated units are connected in advance, concrete is poured on the two prefabricated units simultaneously. By the method, when the two disassembled prefabricated units are connected again, the screw teeth of the large end of the thread do not need to be aligned again, and the two adjacent prefabricated units are ensured to be connected smoothly again. The large head and the sleeve of the reinforcing steel bar thread are independently developed by the applicant, and are detailed in utility model 'reinforcing steel bar connector with large head and sleeve of coarse thread' CN 201821095637.3.

Whether the anti-seismic performance of the concrete structure is reliable or not is the key point, whether the core area of the node is reliable or not is mainly reflected in whether the hooping encryption area of the node is good or not. According to the experience of engineering quality supervision work carried out by the applicant for decades, the situation that the steel bars in the core area of the node are too dense, the main bars are very long and even have hooks, and the installation of the encryption stirrups of the vertical component at the most core position of the node is difficult is caused. Therefore, in the case of a concrete structure cast-in-place site, most of the core areas of the nodes do not work well. Because the stirrup at the most core position of the node core area is not well made, the anchoring strength of the main reinforcement at the most core position is greatly weakened.

In a factory, the prefabricated units are divided on the premise of ensuring the completeness of the node core area, and the node core area can be made professionally. Because the prefabricated units are divided on the premise of ensuring the integrity of the core area of the node, the prefabricated units are also those reinforcing steel bars during manufacturing, but all main reinforcing steel bars which are crossed and anchored in the core area of the node are shortened, the cage is manufactured by the stirrup at the most core position, and then the shorter main reinforcing steel bars pass through the cage easily. After the concrete of the prefabricated units is poured, a node core area with the integration of a column beam plate or a wall beam plate is formed. Therefore, the problem that the strength of the node core area of the prefabricated concrete structure is higher than that of the node core area of the cast-in-place concrete structure is naturally solved, and the key problem that the anti-seismic performance of the concrete structure is improved is solved.

And the stirrup at the most core position in the core area of the node is made, so that the main reinforcement anchoring at the position can be conveniently made. If the main rib hook at a certain position is too long, the problem can be easily solved by adopting the pier anchoring technology. The anchoring of the main reinforcement is better, and the other problem of improving the anti-seismic performance of the fabricated concrete structure is solved.

In conclusion, the fabricated concrete structure with the structure seismic performance stronger than that of the cast-in-place concrete structure can be manufactured by adopting the three-dimensional prefabricating method, and the overall seismic performance of the fabricated building can also be stronger than that of the cast-in-place concrete structure building.

And thirdly, assembling and connecting the prefabricated units layer by layer according to the prefabricated unit numbers. The method specifically comprises the following steps:

in step 301, vertical members of corresponding layers are assembled.

And 302, after the vertical components of the layer are completely assembled, assembling the horizontal components of the layer.

Step 303, pouring concrete at the position of the reserved seam of the layer.

After the prefabricated units forming the vertical members such as the columns, the shear walls, the core barrels and the like are assembled and connected and corrected for rechecking, concrete can be poured in the reserved seams between the upper layer and the lower layer, or after the other prefabricated units forming the horizontal member by the layer are assembled and connected and corrected for rechecking without pouring concrete, the concrete of the reserved seams between the vertical members and the prefabricated units of the horizontal member can be poured at the same time.

And step 304, assembling layer by layer upwards until the whole assembly is completed.

Finally, the description is as follows: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a back-up circulation system for three-dimensional prefabricated full assembled concrete structure which characterized in that: the supporting component comprises a hollow lower cylinder section, an oil cylinder movable section capable of ascending and descending is inserted in the hollow lower cylinder section, a movable support is installed at the top end of the oil cylinder movable section, a conversion support is installed at the top end of the oil cylinder lower section, the conversion support is provided with a through hole for the oil cylinder movable section to extend out, the lower end of the movable support is provided with a groove, the shape of the cross section of the groove is matched with that of the cross section of the oil cylinder movable section, the movable support is detachably sleeved at the top end of the oil cylinder movable section through the groove, the size of the through hole is smaller than that of the lower end of the movable support, the middle part of the conversion support is provided with an accommodating groove for accommodating the movable support and taking out the movable support from the side surface, the upper end surface of the conversion support is provided with a first supporting surface, the upper end surface of the movable support is provided with a second supporting surface, and the first supporting surface is, the construction platform is provided with an avoidance hole for the movable section of the oil cylinder without the movable support to pass through.

2. The support top circulation system for the prefabricated concrete structure of claim 1, wherein: the conversion support comprises a connecting part and two side supporting parts, the conversion support is installed at the top end of the lower section of the oil cylinder through the connecting part, the two side supporting parts are arranged at intervals, the two side supporting parts are symmetrically arranged on the left side and the right side of the connecting part, the first supporting surface is formed at the upper end faces of the two side supporting parts, the through hole is formed in the connecting part, and the two side supporting parts and the through hole are completely staggered so as not to influence the lifting of the movable section of the oil cylinder.

3. The support top circulation system for the prefabricated concrete structure of claim 1, wherein: the second bearing surface is of an elongated structure, and the interval between the two side bearing parts is larger than the width of the second bearing surface to form the accommodating groove.

4. The support top circulation system for the prefabricated concrete structure of claim 2, wherein: the connecting part comprises a cylindrical structure, the front side and the rear side of the cylindrical structure are symmetrically provided with a splitting groove, the upper end of the splitting groove is open, and the width of the splitting groove is larger than that of the second supporting surface so as to form the accommodating groove.

5. The support top circulation system for the prefabricated concrete structure of claim 2, wherein: the lower end of the connecting part is provided with a connecting groove which is matched with the top end of the lower section of the oil cylinder in shape and is sleeved at the top end of the lower section of the oil cylinder.

6. The braced roof circulation system for the prefabricated concrete structures according to any one of claims 1 to 5, characterized in that: the lower section of the oil cylinder is a fixed part of the oil cylinder, the movable section of the oil cylinder is a piston rod part of the oil cylinder, and a plurality of groups of supporting assemblies are arranged.