CN214461625U - Laminated slab overhanging I-shaped steel embedded structure - Google Patents
Laminated slab overhanging I-shaped steel embedded structure Download PDFInfo
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- CN214461625U CN214461625U CN202120564156.8U CN202120564156U CN214461625U CN 214461625 U CN214461625 U CN 214461625U CN 202120564156 U CN202120564156 U CN 202120564156U CN 214461625 U CN214461625 U CN 214461625U
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Abstract
The utility model relates to a technical field of I-steel fixed component encorbelments, to the defect that traditional installation U type clamping ring caused the damage easily to the superimposed sheet, provided a superimposed sheet I-steel embedded construction of encorbelmenting, including the steel template and pour fashioned prefabricated layer at the steel template, pre-buried U type sleeve pipe that has in the prefabricated layer, U type sleeve pipe includes the connecting rod, and the both ends of connecting rod are perpendicular prefabricated layer place plane fixedly connected with is used for supplying two sets of montant male grafting pipes of U type clamping ring, and the upper surface on prefabricated layer is all stretched out to the one end that the connecting rod was kept away from to the grafting pipe, and grafting socle portion can be dismantled and be connected with the magnetic block, and the magnetic block is connected with steel template magnetism. This application has the effect that is difficult for causing the harm to the superimposed sheet when making installation U type clamping ring.
Description
Technical Field
The application relates to the technical field of I-steel fixed component encorbelments, especially relates to a superimposed sheet I-steel embedded construction encorbelments.
Background
Laminated slabs are a common assembled integral floor slab in building construction. In the related technology, the laminated slab usually needs to cast a prefabricated layer in a steel mould at present, demoulding is carried out after the prefabricated layer is solidified, then a cast-in-place concrete layer is cast on the prefabricated layer, and the laminated slab is manufactured after the cast-in-place concrete layer is solidified, so that the upper surface and the lower surface of the laminated slab are smooth, decoration of a decorative layer is facilitated, and the laminated slab is suitable for high-rise buildings and large-bay buildings with high requirements on integral rigidity.
When protective mechanisms such as overhanging type scaffolds are installed at the laminated slab, the overhanging type scaffolds generally need to be installed and fixed on the laminated slab as a supporting structure, and in the related art, the h-shaped steel is generally installed and fixed by using a U-shaped compression ring pre-fixed in the laminated slab. The U-shaped clamping ring comprises a transverse rod and vertical rods vertically arranged at two ends of the transverse rod, outer walls of the vertical rods are provided with external threads, two ends of each vertical rod are protruded to the upper surface of the laminated slab, two groups of through holes need to be drilled at the bottom side of the laminated slab when the U-shaped clamping ring is fixed, the two groups of vertical rods of the U-shaped clamping ring penetrate through the two through holes respectively, the top end of each vertical rod is screwed in and abuts against the fastening nut until the fastening nut abuts against the upper surface of the laminated slab, the U-shaped clamping ring is fixed on the laminated slab, I-shaped steel is placed between the two groups of vertical rods when the I-shaped steel is fixed in installation, a pressing plate located above the I-shaped steel is sleeved on each vertical rod, and then the top end of each vertical rod is screwed in and locked by the locking nut, and the I-shaped steel is pressed and fixed through the pressing plate.
With the related art as described above, drilling holes at the laminated slab tends to cause structural strength of the laminated slab to be impaired, and thus there is room for improvement.
SUMMERY OF THE UTILITY MODEL
In order to make difficult damage to the superimposed sheet when installation U type clamping ring, this application has proposed a superimposed sheet I-steel embedded construction that encorbelments.
The application provides a pair of superimposed sheet I-steel embedded construction of encorbelmenting adopts following technical scheme:
the utility model provides a superimposed sheet I-steel embedded construction of encorbelmenting, includes the steel template and pours fashioned prefabricated layer at the steel template, pre-buried U type sleeve pipe that has in the prefabricated layer, U type sleeve pipe includes the connecting rod, the both ends of connecting rod are perpendicular prefabricated layer place plane fixedly connected with is used for supplying two sets of montant male grafting pipes of U type clamping ring, the upper surface on prefabricated layer is all stretched out to the one end that the connecting rod was kept away from to the grafting pipe, grafting socle portion can be dismantled and be connected with the magnetic block, the magnetic block is connected with steel template magnetism.
Through adopting above-mentioned technical scheme, the magnetism piece is fixed U type sleeve on steel template, the completion back is pour on steel template to the prefabricated layer, demolish steel template prefabricated layer bottom, carry out pouring of follow-up cast-in-place concrete layer, treat cast-in-place concrete layer and solidify the back, accomplish the preparation of superimposed sheet, demolish the magnetism piece from prefabricated layer bottom again, when needs are at superimposed sheet internal fixation U type clamping ring, two montants of U type clamping ring can directly penetrate two sets of grafting pipes respectively and stretch out to the upper surface of superimposed sheet, be favorable to reducing the follow-up condition that causes the destruction to the superimposed sheet structure in superimposed sheet department drilling, and simultaneously, through the setting of U type sheathed tube, still do benefit to the intensity that strengthens the superimposed sheet after the superimposed sheet is pour and is accomplished.
Preferably, a screw rod is detachably connected in the insertion pipe, a threaded hole is formed in the upper surface of the magnetic block, and the bottom end of the screw rod extends out of the bottom end of the insertion pipe and is in threaded connection with the threaded hole.
Through adopting above-mentioned technical scheme, when the magnetism piece is fixed to needs, with the screw hole and the screw rod threaded connection of magnetism piece, utilize threaded connection's self-locking effect, make the magnetism piece can connect in the sleeve pipe bottom better, make the magnetism piece be difficult for coming off from the sleeve pipe bottom, be favorable to U type sleeve pipe to fix on the steel template more firmly, when making the prefabricated layer of pouring superimposed sheet on the steel template, U type sleeve pipe is difficult for producing the displacement, the later stage superimposed sheet of being convenient for pours the completion back, two montants of U type clamping ring can penetrate two grafting intraductal of U type sheathed tube better.
Preferably, the top end of the screw rod is slidably sleeved with a limiting washer used for plugging the pipe orifice of one end, far away from the connecting rod, of the plug-in pipe, the top end of the screw rod is further in threaded connection with a limiting nut, and the limiting nut and the upper surface of the limiting washer are tightly abutted.
By adopting the technical scheme, when the magnetic block needs to be fixed, the screw rod is inserted into the splicing pipe, the bottom end of the screw rod is in threaded connection with the threaded hole of the magnetic block, the gasket is sleeved at the top end of the screw rod, the limiting nut is screwed into the screw rod until the limiting nut is tightly abutted to the limiting gasket, the installation of the magnetic block is completed, when the magnetic block needs to be removed, the limiting nut is screwed out of the screw rod, and the magnetic block and the screw rod are removed together from the bottom of the splicing pipe, so that the magnetic block is more simple and convenient to disassemble; simultaneously, through the setting of spacing packing ring for when in the follow-up precast layer of pouring and pour cast in situ concrete layer, the difficult mouth of pipe that gets into through the grafting pipe top of concrete is intraductal.
Preferably, the bottom side of the connecting rod is provided with a holding tank for embedding the cross rod of the U-shaped compression ring, and the two ends of the holding tank in the length direction are respectively communicated with the two inserting pipes.
Through adopting above-mentioned technical scheme, through the setting of holding tank for follow-up U type pole piece's horizontal pole can be embedded into to the holding tank, makes two montants of U type clamping ring insert two sets of pipe backs of pegging graft respectively, and the horizontal pole of U type clamping ring can not produce the condition of wearing and tearing to the lower surface on prefabricated layer with superimposed sheet's lower surface butt, is favorable to reducing the horizontal pole of U type clamping ring.
Preferably, the bottom of the U-shaped sleeve is bonded with a first sealing layer for sealing the pipe orifice at the bottom end of the inserting pipe and the accommodating groove, and the first sealing layer is provided with a first through hole for inserting the screw rod.
Through adopting above-mentioned technical scheme, setting through first sealing layer is favorable to reducing the in-process of pouring the prefabricated layer on steel template, the concrete gets into the mouth of pipe and the holding tank interior condition of grafting socle end, steel template and magnetism piece are demolishd the back, only need tear first sealing layer from U type sleeve bottom alright make the mouth of pipe and the holding tank and the external intercommunication of grafting socle end, the holding tank can be embedded into to two montant disect insertions of the follow-up U type clamping ring of being convenient for and two horizontal poles of grafting pipe and U type clamping ring.
Preferably, the magnetic block is in a round cake shape, the axis of the threaded hole is collinear with the axis of the magnetic block, and the outer diameter of the magnetic block is larger than that of the insertion pipe.
By adopting the technical scheme, the contact area between the upper surface of the magnetic block and the lower surface of the first sealing layer is favorably increased, so that the upper surface of the magnetic block can be better and tightly abutted against the bottom side of the first sealing layer, and further the first sealing layer can be better and tightly abutted against the end face of the orifice at the bottom end of the splicing hole and the bottom side of the connecting rod, and when concrete is poured on the steel template, the concrete is more difficult to enter the orifice at the bottom end of the splicing pipe and the accommodating groove.
Preferably, a second sealing layer is further fixedly bonded to the bottom of the first sealing layer, and the second sealing layer is located between the two magnetic blocks and used for plugging a gap between the lower surface of the first sealing layer and the upper surface of the steel template.
Through adopting above-mentioned technical scheme, through the setting of second sealing layer, when pouring the superimposed sheet on the steel template, the difficult clearance that gets into between first sealing layer and the steel template of concrete is favorable to reducing the condition that the clearance that the concrete got into between first sealing layer and the steel template leads to follow-up first sealing layer of demolishment difficulty for demolishment of first sealing layer is simple and convenient more.
Preferably, the lower surface of the limit washer is covered with a rubber layer.
Through adopting above-mentioned technical scheme, through the setting on rubber layer, when the steel template concreting, the concrete is more difficult to get into in the grafting through the clearance between spacing washer and the sleeve pipe, is favorable to reducing the screw rod by the concrete solidification in the intraductal condition of grafting, and the screw rod of being convenient for is demolishd from the grafting is intraductal.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the magnetic block is detachably connected to the bottom end of the U-shaped sleeve, so that the U-shaped sleeve can be fixed on the steel template, two vertical rods of the later U-shaped pressure ring can directly penetrate into the two inserting pipes and extend out of the upper surface of the laminated plate, a through hole does not need to be drilled in the laminated plate when the U-shaped pressure ring is installed, and the U-shaped pressure ring is beneficial to reducing abrasion to the laminated plate when the U-shaped pressure ring is installed;
2. the screw rod is detachably connected in the splicing pipe, the threaded hole is formed in the magnetic block, and the bottom end of the screw rod is in threaded connection with the threaded hole, so that the magnetic block can be more stably in threaded connection with the bottom end of the splicing pipe, and further the U-shaped sleeve can be more stably fixed on the steel template, and the U-shaped sleeve is not easy to displace in the process of pouring concrete on the steel template to form a laminated slab;
3. the first sealing layer is fixedly bonded to the bottom of the U-shaped sleeve, so that the concrete can enter the insertion pipe and the accommodating groove when being poured on the steel template, and the insertion pipe and the accommodating groove are not easily blocked by the concrete.
Drawings
FIG. 1 is a schematic view of an embodiment of the present application for illustrating a stage of production of a laminated board;
FIG. 2 is an exploded view of the embodiment of the present application for illustrating the connection relationship between the magnetic block and the U-shaped sleeve;
FIG. 3 is a sectional schematic view for illustrating a U-shaped sleeve according to an embodiment of the application;
fig. 4 is a schematic structural diagram for illustrating the installation of a U-shaped pressure ring on a U-shaped sleeve according to an embodiment of the present application.
Description of reference numerals: 1. a steel template; 2. a laminated slab; 21. prefabricating a layer; 22. a concrete layer is cast in place; 3. a U-shaped sleeve; 31. a connecting rod; 32. inserting a pipe; 310. accommodating grooves; 321. a wing plate; 4. a magnetic block; 40. a threaded hole; 5. a screw; 51. a limiting washer; 52. a limit nut; 510. a rubber layer; 511. a second through hole; 6. a first sealing layer; 61. a second sealing layer; 7. a vertical rod; 70. tightly abutting the nut; 71. locking the nut; 72. pressing a plate; 8. and (4) H-shaped steel.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses superimposed sheet I-steel embedded construction that encorbelments. Referring to fig. 1 and 2, the steel formwork comprises a horizontally arranged steel formwork 1, a prefabricated layer 21 is formed on the upper surface of the steel formwork 1 in a pouring mode, a U-shaped sleeve 3 is embedded in the prefabricated layer 21, the U-shaped sleeve 3 comprises a connecting rod 31, two ends of the connecting rod 31 in the length direction are fixedly connected with inserting tubes 32 for inserting two vertical rods 7 of the U-shaped compression ring, the axial direction of the inserting tubes 32 is perpendicular to the horizontal plane of the steel formwork 1, one ends of the inserting tubes 32 far away from the connecting rod 31 extend out of the upper surface of the prefabricated layer 21, referring to fig. 3, accommodating grooves 310 for embedding cross rods of the U-shaped compression ring are formed in the bottom side of the connecting rod 31, two ends of the accommodating grooves 310 in the length direction are respectively communicated with the two inserting tubes 32, the bottom ends of the inserting tubes 32 are detachably connected with magnetic blocks 4, the magnetic blocks 4 are magnetically connected with the upper surface of the steel formwork 1, and are convenient for fixing the U-shaped sleeve 3 on the steel formwork 1, so that the U-shaped sleeve 3 is not easy to displace when the prefabricated layer 21 is poured on the steel template 1.
Referring to fig. 1 and 2, all can dismantle in two sets of pipes 32 of pegging graft and be connected with screw rod 5, in this embodiment, screw rod 5 and the pipe 32 sliding connection of pegging graft, screw rod 5's axis and the axis collineation of the pipe 32 of pegging graft, the both ends of the pipe 32 of pegging graft are stretched out respectively to screw rod 5's both ends, in this embodiment, magnetism piece 4 is the cake form, screw hole 40 is seted up to the upper surface of magnetism piece 4, the axis of screw hole 40 and the coaxial setting of the axis of magnetism piece 4, screw hole 40 and the 5 bottom end threaded connection of screw rod, make magnetism piece 4 can more firmly connect in the pipe 32 bottom of pegging graft.
Referring to fig. 2 and 3, the U-shaped sleeve 3 further includes a wing 321 fixedly connected to the outer wall of the bottom of the insertion tube 32, and the lower surface of the wing 321 is flush with the end surface of the bottom end of the insertion tube 32. The bottom of the U-shaped sleeve 3 is also bonded and fixed with the first sealing layer 6 for sealing the pipe orifice of the inserting pipe 32 and the accommodating groove 310, in this embodiment, the first sealing layer 6 is a double-faced adhesive tape, and the projection of the first sealing layer 6 on the horizontal plane is greater than the projection of the U-shaped sleeve 3 on the horizontal plane, so that when the laminated slab 2 is poured on the steel formwork 1, the concrete and the like are not easy to enter the inserting pipe 32 and the accommodating groove 310, and the first sealing layer 6 is provided with a first through hole for the screw rod 5 to penetrate through.
Referring to fig. 1 and 2, the top end of the screw rod 5 is slidably sleeved with a limit washer 51 for plugging the pipe orifice at the top end of the insertion pipe 32; spacing washer 51 external diameter is greater than plug tube 32 external diameter, spacing washer 51 is the cake form, spacing washer 51 has seted up the second through-hole 511 that supplies screw rod 5 to peg graft, the axis of second through-hole 511 and the coaxial setting of spacing washer 51 axis, spacing washer 51's lower surface and the terminal surface butt on plug tube 32 top, spacing washer 51's lower surface still covers and is provided with rubber layer 510, be favorable to increasing the leakproofness between the mouth of pipe on spacing washer 51 and plug tube 32 top, make when pouring concrete on steel template 1, the concrete is difficult for getting into in the plug tube 32 through the clearance between spacing washer 51 and the plug tube 32 top mouth of pipe. The top end of the screw rod 5 is further connected with a limit nut 52 in a threaded manner, the limit nut 52 is tightly abutted to the upper surface of the limit washer 51, and the limit nut 52 connected to the top end of the screw rod 5 in a threaded manner is interlocked with the magnetic block 4 connected to the bottom end of the screw rod 5 in a threaded manner, so that the magnetic block 4 is not easy to displace.
Referring to fig. 1 and 2, in the embodiment, the outer diameter of the magnetic block 4 is larger than the outer diameter of the insertion tube 32, so that the magnetic block 4 better abuts against the first sealing layer 6, and further the first sealing layer 6 better abuts against the end surface of the bottom end of the insertion tube 32 and the bottom side of the connecting rod 31.
Referring to fig. 1 and 2, a second sealing layer 61 is further fixedly connected to the bottom side of the first sealing layer 6, the second sealing layer 61 is located between the two sets of magnetic blocks 4, the thickness of the second sealing layer 61 is the same as that of the magnetic blocks 4, and one side, away from the first sealing layer 6, of the second sealing layer 61 is fixedly bonded to the upper surface of the steel formwork 1, so that when the prefabricated layer 21 is poured on the steel formwork 1, concrete cannot easily enter a gap between the bottom side of the first sealing layer 6 and the upper surface of the steel formwork 1, and the first sealing layer 6 cannot be torn off after the steel formwork 1 is demolded.
The implementation principle of the embodiment of the application is as follows: when the U-shaped sleeve 3 needs to be fixed on the steel template 1, the first sealing layer 6 is bonded at the bottom end of the U-shaped sleeve 3, the screw rod 5 is inserted into the insertion tube 32 from the top end of the insertion tube 32, the screw rod 5 penetrates through the first through hole in the first sealing layer 6, the magnetic block 4 is connected to one end, extending out of the first sealing layer 6, of the screw rod 5 in a threaded manner, the screw rod 5 is moved, so that the upper surface of the magnetic block 4 abuts against the lower surface of the first sealing layer 6, the limiting washer 51 is sleeved into the top end of the screw rod 5, the limiting nut 52 is screwed into the top end of the screw rod 5 until the upper surfaces of the limiting nut 52 and the limiting washer 51 abut against tightly, and the operations are repeated until the two groups of magnetic blocks 4 are respectively fixed at the bottom ends of the two groups of insertion tubes 32.
The second sealing layer 61 is fixedly bonded to the bottom side of the first sealing layer 6, the U-shaped sleeve 3 is placed on the upper surface of the steel template 1, the lower surfaces of the two magnetic blocks 4 are respectively in magnetic connection with the upper surface of the steel template 1, the prefabricated layer 21 is poured on the steel template 1 firstly, demolding is carried out on the steel template 1 after the prefabricated layer 21 is solidified, the cast-in-place concrete layer 22 is poured on the prefabricated layer 21, the laminated slab 2 is manufactured after the cast-in-place concrete layer 22 is solidified, the limiting nut 52 at the top end of the screw rod 5 is screwed out, the limiting washer 51 is removed, the magnetic blocks 4 are connected with the screw rod 5, the screw rod 5 is removed from the bottom of the prefabricated layer 21 together, and the first sealing layer 6 and the second sealing layer 61 are removed from the prefabricated layer 21.
Referring to fig. 4, when the i-steel 8 needs to be fixed, two groups of vertical rods 7 of the U-shaped press ring are respectively inserted into the two groups of insertion pipes 32, the U-shaped press ring is moved until a cross rod of the U-shaped press ring is embedded into the accommodating groove 310, the two groups of vertical rods 7 are respectively screwed into the abutting nuts 70 at the top ends of the two groups of vertical rods 7 until the abutting nuts 70 abut against the upper surface of the laminated plate 2, so that the U-shaped press ring is fixed, the i-steel 8 is placed between the two groups of vertical rods 7, the press plate 72 is sleeved on the vertical rods 7, the two groups of locking nuts 71 are respectively screwed into the top ends of the vertical rods 7, and the two groups of locking nuts 71 are respectively screwed, so that the i-steel 8 is fixed.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a superimposed sheet I-steel embedded construction of encorbelmenting which characterized in that: including steel template (1) and pour fashioned prefabricated layer (21) in steel template (1), pre-buried U type sleeve pipe (3) that has in prefabricated layer (21), U type sleeve pipe (3) are including connecting rod (31), the both ends of connecting rod (31) are perpendicular prefabricated layer (21) place plane fixedly connected with is used for supplying two sets of montants (7) male grafting pipe (32) of U type clamping ring, the upper surface on prefabricated layer (21) is all stretched out to the one end that connecting rod (31) were kept away from in grafting pipe (32), grafting pipe (32) bottom can be dismantled and be connected with magnetic block (4), magnetic block (4) are connected with steel template (1) magnetism.
2. The laminated slab overhanging joist steel embedded structure as claimed in claim 1, wherein: the magnetic block is characterized in that a screw rod (5) is detachably connected in the insertion pipe (32), a threaded hole (40) is formed in the upper surface of the magnetic block (4), and the bottom end of the screw rod (5) extends out of the bottom end of the insertion pipe (32) and is in threaded connection with the threaded hole (40).
3. The laminated slab overhanging joist steel embedded structure as claimed in claim 2, wherein: the top end of the screw rod (5) is slidably sleeved with a limiting washer (51) used for plugging the pipe orifice of one end, far away from the connecting rod (31), of the insertion pipe (32), the top end of the screw rod (5) is further connected with a limiting nut (52) in a threaded mode, and the limiting nut (52) is tightly abutted to the upper surface of the limiting washer (51).
4. The laminated slab overhanging joist steel embedded structure as claimed in claim 3, wherein: the bottom side of the connecting rod (31) is provided with a containing groove (310) for embedding a cross rod of the U-shaped compression ring, and two ends of the containing groove (310) in the length direction are respectively communicated with the two inserting pipes (32).
5. The laminated slab overhanging joist steel embedded structure as claimed in claim 2, wherein: the bottom of the U-shaped sleeve (3) is bonded with a first sealing layer (6) used for sealing a pipe orifice at the bottom end of the inserting pipe (32) and the accommodating groove (310), and the first sealing layer (6) is provided with a first through hole for inserting the screw rod (5).
6. The laminated slab overhanging joist steel embedded structure as claimed in claim 2, wherein: the magnetic block (4) is in a round cake shape, the axis of the threaded hole (40) is collinear with the axis of the magnetic block (4), and the outer diameter of the magnetic block (4) is larger than that of the insertion pipe (32).
7. The laminated slab overhanging joist steel embedded structure as claimed in claim 5, wherein: and a second sealing layer (61) is further fixedly bonded to the bottom of the first sealing layer (6), and the second sealing layer (61) is positioned between the two magnetic blocks (4) and used for plugging a gap between the lower surface of the first sealing layer (6) and the upper surface of the steel template (1).
8. The laminated slab overhanging joist steel embedded structure as claimed in claim 3, wherein: the lower surface of the limiting washer (51) is further covered with a rubber layer (510).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120564156.8U CN214461625U (en) | 2021-03-18 | 2021-03-18 | Laminated slab overhanging I-shaped steel embedded structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120564156.8U CN214461625U (en) | 2021-03-18 | 2021-03-18 | Laminated slab overhanging I-shaped steel embedded structure |
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| Publication Number | Publication Date |
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| CN214461625U true CN214461625U (en) | 2021-10-22 |
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| CN202120564156.8U Active CN214461625U (en) | 2021-03-18 | 2021-03-18 | Laminated slab overhanging I-shaped steel embedded structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116446647A (en) * | 2023-06-15 | 2023-07-18 | 北京建工集团山西建设有限公司 | U-shaped ring through hole forming die and forming method for inner side end of overhanging I-shaped steel beam |
-
2021
- 2021-03-18 CN CN202120564156.8U patent/CN214461625U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116446647A (en) * | 2023-06-15 | 2023-07-18 | 北京建工集团山西建设有限公司 | U-shaped ring through hole forming die and forming method for inner side end of overhanging I-shaped steel beam |
| CN116446647B (en) * | 2023-06-15 | 2023-08-18 | 北京建工集团山西建设有限公司 | U-shaped ring through hole forming die and forming method for inner side end of overhanging I-shaped steel beam |
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