CN103341570A - Tunnel inverted arch rebar connecting rib bending machine - Google Patents
Tunnel inverted arch rebar connecting rib bending machine Download PDFInfo
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- CN103341570A CN103341570A CN2013103067494A CN201310306749A CN103341570A CN 103341570 A CN103341570 A CN 103341570A CN 2013103067494 A CN2013103067494 A CN 2013103067494A CN 201310306749 A CN201310306749 A CN 201310306749A CN 103341570 A CN103341570 A CN 103341570A
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- reinforcing bar
- directive wheel
- bending machine
- rolling shaft
- inverted arch
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Abstract
The invention discloses a tunnel inverted arch rebar connecting rib bending machine which comprises a supporting face plate, a rolling shaft, a driving mechanism and an ejector. A first guide wheel is arranged at one end of the supporting face plate, a second guide wheel is arranged at the other end of the supporting face plate, an adjusting hole is formed in the supporting face plate, the adjusting hole is formed between the first guide wheel and the second guide wheel and is formed in one side of the connecting line of the first guide wheel and the second guide wheel, a bearing is arranged on the rolling shaft and arranged in the adjusting hole, a rolling wheel is arranged at one end of the rolling shaft, the other end of the rolling shaft is connected with the driving mechanism, the first guide wheel, the second guide wheel and the rolling wheel are all arranged on the front side face of the supporting face plate, and a sliding groove allowing the driving mechanism to slide along with the rolling shaft is formed in the rear side face of the supporting face plate. The tunnel inverted arch rebar connecting rib bending machine can pre-bend one portion of an inverted arch rebar connecting rib, and can further carry out continuous rolling on the inverted arch rebar connecting rib, and the bending of the inverted arch rebar connecting rib is achieved.
Description
Technical field
The present invention relates to a kind of angle-bender, particularly relate to a kind of tunnel invert reinforcing bar and connect a batch muscle bending machine.
Background technology
In the tunnel invert work progress, the inverted arch reinforcing bar all will have been reserved 1～2 meter and connect a batch muscle generally speaking.Because this part reinforcing bar is to be in the inverted arch termination, fail to form the nature arc with the inverted arch reinforcing bar.Carry out the pre-bending processing so must dock batch muscle.
At present, the pre-bending processing mode that the inverted arch reinforcing bar is connect the stubble part is: the desk-top prebending machine of inverted arch reinforcing bar in the reinforcing bar processing space carried out pre-bending, before need employing large-scale hanging device reinforcing bar being winched to desk-top prebending machine, by at least two operators the inverted arch reinforcing bar is lifted on the prebending machine again, carried out pre-bending again.After pre-bending finished, lifting was transported to on-the-spot the installation again.This operation workload is big, and inconvenient operation.And this desk-top angle-bender, though can realize continuous bend to reinforcing bar, weak point is exactly bulky, inconvenient operation; In addition, also have a kind of portable angle-bender, its weak point can only be carried out the single-point bending to the inverted arch reinforcing bar exactly, can't realize continuous bend, and the bending effect is bad.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency of the prior art, provide a kind of tunnel invert reinforcing bar to connect a batch muscle bending machine.This tunnel invert reinforcing bar connects batch muscle bending machine and can connect a certain position of batch muscle to the inverted arch reinforcing bar and carry out pre-bending, and then can connect the continuous roll extrusion of batch muscle to the inverted arch reinforcing bar, realized that the inverted arch reinforcing bar connects the bending of batch muscle, it is simple in structure, easy to use, validity is strong, production cost is low, is convenient to promote the use of.
For achieving the above object, the technical solution used in the present invention is: the tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: comprise support panel, rolling shaft, be used for to drive the driving mechanism that rolling shaft rotates and be used for promoting rolling shaft and move and the inverted arch reinforcing bar is connect the pusher that batch muscle carries out pre-bending, one end of described support panel is equipped with first directive wheel, the other end of described support panel is equipped with second directive wheel, offer on the described support panel for rolling shaft and stretch into and be used for the inverted arch reinforcing bar is connect batch adjustment hole that the muscle degree of crook is regulated, described adjustment hole is arranged between first directive wheel and second directive wheel, and be positioned at a side of first directive wheel and the second directive wheel line, on the described rolling shaft and the position that is positioned at described adjustment hole is equipped with the bearing that cooperates for described pusher butt, one end of described rolling shaft is equipped with for the inverted arch reinforcing bar being connect batch rolling wheel of the continuous roll extrusion of muscle, the other end of described rolling shaft is connected with driving mechanism, described first directive wheel, second directive wheel and rolling wheel all are positioned at the leading flank of support panel, and the trailing flank of described support panel is provided with the chute that slides with rolling shaft for driving mechanism.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: be provided with in the described adjustment hole be used to the back-moving spring that rolling shaft is resetted, described rolling shaft is between back-moving spring and pusher, one end of described back-moving spring is installed on the hole wall of adjustment hole, and the other end of described back-moving spring is connected with bearing.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: described pusher comprises the bracing frame that is connected with support panel and the hydraulic jack that is connected with bracing frame, the outer end of described hydraulic cylinder piston rod penetrates in the bracing frame, be provided with positioning regulator between described rolling shaft and the bracing frame, described positioning regulator comprises screw rod and the nut that is enclosed within on the screw rod, one end and the piston rod of described screw rod connect, and the other end of described screw rod penetrates support panel and stretches in the adjustment hole and cooperates with the bearing butt.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: be connected with handle on the described hydraulic jack.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: described support panel is provided with handle.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: described driving mechanism comprises motor and speed reducer, the output shaft of described motor is connected with the power shaft of reductor by flexible drive axle, described rolling shaft is connected with the output shaft of reductor, and described reductor is installed in the trailing flank of support panel and is positioned at described chute.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: be provided with on the outer circumference surface of described rolling wheel, first directive wheel and second directive wheel with the inverted arch reinforcing bar and connect the suitable spill guiding groove of batch muscle.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: the cell wall of described spill guiding groove is provided with a plurality of bar shaped fins.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: the line of the bearing of trend of described adjustment hole and first directive wheel and second directive wheel is perpendicular.
Above-mentioned tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: described first directive wheel, second directive wheel and rolling wheel are isosceles triangle and distribute.
The present invention compared with prior art has the following advantages:
1, main cooperating by rolling shaft, first directive wheel, second directive wheel and rolling wheel and pusher and bearing of the present invention, earlier the inverted arch reinforcing bar is connect batch muscle and carry out pre-bending, and by pusher the degree of crook that the inverted arch reinforcing bar connects batch muscle is kept, realize the inverted arch reinforcing bar is connect the continuous roll extrusion of batch muscle then by rolling wheel, deducted the situation that the operator repeats to carry reinforcing bar in a large number, reduced labour intensity, made bar bending work become simple.
2, the present invention carries out bending process to mounted inverted arch reinforcing bar, and it has saved the pre-bending work for the treatment of of carrying out before the inverted arch reinforcement installation, carries out pre-bending at the scene after the inverted arch construction is finished, and has reduced construction cost, has accelerated construction speed.
3, the present invention is by arranging positioning regulator, when the inverted arch reinforcing bar being connect batch muscle pre-bending and handles, conveniently the inverted arch reinforcing bar is connect batch muscle pre-bending to the target degree of crook, realization connects batch control of muscle pre-bending degree to the inverted arch reinforcing bar, and can also avoiding the pusher jacking force, excessive to cause the inverted arch reinforcing bar to connect batch muscle degree of crook excessive.
4, present device lightly is convenient to operation, and the manpower of input is few, only needs people's operation to get final product.
5, realization cost of the present invention is low, and result of use is good, is convenient to promote the use of.
In sum, the present invention is simple in structure, and is rationally novel in design, the functional reliability height, and long service life has reduced construction cost, has accelerated construction speed, and result of use is good, is convenient to promote the use of.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is front view of the present invention.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is upward view of the present invention.
Fig. 4 connects the annexation schematic diagram of batch muscle for the present invention and inverted arch reinforcing bar.
Fig. 5 is the structural representation of rolling wheel of the present invention, first directive wheel and second directive wheel.
Description of reference numerals:
1-support panel; 2-the first directive wheel; 3-rolling wheel;
3-1-spill guiding groove; 3-2-bar shaped fin; 4-pusher;
4-1-bracing frame; 4-2-hydraulic jack; 4-2-1-piston rod;
4-3-positioning regulator; 4-3-1-screw rod; 4-3-2-nut;
5-handle; 6-driving mechanism; 6-1-motor;
6-2-flexible drive axle; 6-3-reductor; 7-rolling shaft;
8-adjustment hole; 9-bearing; 10-the second directive wheel;
11-back-moving spring; 12-handle; 13-chute;
14-inverted arch reinforcing bar connects a batch muscle.
The specific embodiment
As Fig. 1, Fig. 2, Fig. 3 and a kind of tunnel tunnel invert reinforcing bar shown in Figure 4 connect a batch muscle bending machine, comprise support panel 1, rolling shaft 7, be used for to drive the driving mechanism 6 that rolling shaft 7 rotates and be used for promoting rolling shaft 7 and move and the inverted arch reinforcing bar is connect the pusher 4 that batch muscle 14 carries out pre-bending, one end of described support panel 1 is equipped with first directive wheel 2, the other end of described support panel 1 is equipped with second directive wheel 10, offer on the described support panel 1 for rolling shaft 7 and stretch into and be used for the inverted arch reinforcing bar is connect the adjustment hole 8 that batch muscle 14 degree of crook are regulated, described adjustment hole 8 is arranged between first directive wheel 2 and second directive wheel 10, and be positioned at a side of first directive wheel 2 and second directive wheel, 10 lines, on the described the rolling shaft 7 and position that is positioned at described adjustment hole 8 is equipped with the bearing 9 that cooperates for described pusher 4 butts, one end of described rolling shaft 7 is equipped with for the rolling wheel 3 that the inverted arch reinforcing bar is connect the 14 continuous roll extrusion of batch muscle, the other end of described rolling shaft 7 is connected with driving mechanism 6, described first directive wheel 2, second directive wheel 10 and rolling wheel 3 all are positioned at the leading flank of support panel 1, and the trailing flank of described support panel 1 is provided with the chute 13 that slides with rolling shaft 7 for driving mechanism 6.
When present embodiment uses, earlier this bending machine is stuck on the inverted arch reinforcing bar, pusher 4 stretches in the adjustment hole 8 and withstands on the bearing 9, described rolling wheel 3 connects 14 bendings of batch muscle with the inverted arch reinforcing bar, open driving mechanism 6 again, driving mechanism 6 drives rolling wheel 3 by rolling shaft 7 and rotates, it is mobile from bottom to top that described rolling wheel 3 these bending machine integral body of drive connect batch muscle 14 along the inverted arch reinforcing bar, thereby realize the inverted arch reinforcing bar is connect the continuous roll extrusion bending process of batch muscle 14, when this bending machine moves to the inverted arch reinforcing bar and connects the end of batch muscle 14, close driving mechanism 6, the jacking force that pusher 4 is removed bearing 9, this bending machine slides into ground along the inverted arch reinforcing bar, takes off this bending machine, carries out next root inverted arch reinforcing bar and connects batch muscle 14 buckling works.
In the present embodiment, this tunnel invert reinforcing bar connects batch muscle bending machine cooperating by rolling shaft 7, first directive wheel 2, second directive wheel 10 and rolling wheel 3 and pusher 4 and bearing 9, earlier the inverted arch reinforcing bar is connect batch muscle 14 and carry out pre-bending, and the degree of crook that connects batch muscle 14 by 4 pairs of inverted arch reinforcing bars of pusher keeps, realize the inverted arch reinforcing bar is connect the continuous roll extrusion of batch muscle 14 then by rolling wheel 3, deducted the situation that the operator repeats to carry reinforcing bar in a large number, reduced labour intensity, made bar bending work become simple.
As shown in Figure 3, be provided with in the described adjustment hole 8 be used to the back-moving spring 11 that rolling shaft 7 is resetted, described rolling shaft 7 is between back-moving spring 11 and pusher 4, and an end of described back-moving spring 11 is installed on the hole wall of adjustment hole 8, and the other end of described back-moving spring 11 is connected with bearing 9.By back-moving spring 11 is set, make that when pusher 4 is removed jacking force to bearing 9 rolling wheel 3 can break away from fast with the inverted arch reinforcing bar and connects contacting of batch muscle 14, make things convenient for this bending machine is connect batch muscle 14 from the inverted arch reinforcing bar to unload down.
In conjunction with Fig. 1 and Fig. 2, described pusher 4 comprises the bracing frame 4-1 that is connected with support panel 1 and the hydraulic jack 4-2 that is connected with bracing frame 4-1, the outer end of described hydraulic jack 4-2 piston rod 4-2-1 penetrates in the bracing frame 4-1, be provided with positioning regulator 4-3 between described rolling shaft 7 and the bracing frame 4-1, described positioning regulator 4-3 comprises screw rod 4-3-1 and the nut 4-3-2 that is enclosed within on the screw rod 4-3-1, an end and the piston rod 4-2-1 of described screw rod 4-3-1 connect, and the other end of described screw rod 4-3-1 penetrates support panel 1 and stretches in the adjustment hole 8 and cooperates with bearing 9 butts.
In the present embodiment, when described positioning regulator 4-3 uses, piston rod 4-2-1 stretches out an end that withstands on screw rod 4-3-1, continuous nutting 4-3-2 then, because the effect of screw thread power between screw rod 4-3-1 and the nut 4-3-2, make screw rod 4-3-1 constantly stretch in the adjustment hole 8 and withstand on the bearing 9, screw rod 4-3-1 is when constantly stretching into adjustment hole 8, piston rod 4-2-1 is along with the movement of screw rod 4-3-1 holds out against screw rod 4-3-1, when the inverted arch reinforcing bar connects batch muscle 14 and reaches the target degree of crook, stop to the turning of nut 4-3-2, at this moment, piston rod 4-2-1 maintenance holds out against screw rod 4-3-1's, and screw rod 4-3-1 keeps holding out against bearing 9.By positioning regulator 4-3 is set, when the inverted arch reinforcing bar being connect batch muscle 14 pre-bendings processing, can finely tune by the pre-bending degree that positioning regulator 4-3 inverted arch reinforcing bar connects batch muscle 14, conveniently the inverted arch reinforcing bar is connect 14 pre-bendings of batch muscle to the target degree of crook, realization connects the control of batch muscle 14 pre-bending degree to the inverted arch reinforcing bar, and can also avoiding pusher 4 jacking force, excessive to cause the inverted arch reinforcing bar to connect batch muscle 14 degree of crook excessive.
As depicted in figs. 1 and 2, be connected with handle 5 on the described hydraulic jack 4-2, described support panel 1 is provided with handle 12.By handle 5 is set, convenient when this bending machine moves along the inverted arch reinforcing bar, make things convenient for people's controlling bending machine.By handle 12 being set, convenient moving this bending machine.
As shown in Figure 1, described driving mechanism 6 comprises motor 6-1 and reductor 6-3, the output shaft of described motor 6-1 is connected with the power shaft of reductor 6-3 by flexible drive axle 6-2, described rolling shaft 7 is connected with the output shaft of reductor 6-3, and described reductor 6-3 is installed in the trailing flank of support panel 1 and is positioned at described chute 13.
In the present embodiment, when pusher 4 carries out pushing tow by 9 pairs of rolling shafts of bearing 7, rolling shaft 7 produces displacement in adjustment hole 8, at this moment, mobile with rolling shaft 7 in chute 13 with the reductor 6-3 that adjustment hole 8 is connected, present embodiment is by being installed in reductor 6-3 on the support panel 1, and realize being connected of reductor 6-3 and motor 6-1 by flexible drive axle 6-2, reduced this bending machine connects batch muscle 14 movable parts along the inverted arch reinforcing bar weight, make things convenient for staff's manual operations, and improved operating efficiency.Certainly, present embodiment, driving mechanism 6 also can take to be integrated with reducing motor, and described reducing motor is installed in the chute 13 of trailing flank of support panel 1.
As shown in Figure 5, be provided with on the outer circumference surface of described rolling wheel 3, first directive wheel 2 and second directive wheel 10 with the inverted arch reinforcing bar and meet the suitable spill guiding groove 3-1 of batch muscle 14, by being set, spill guiding groove 3-1 can effectively avoid in the buckling work process, the inverted arch reinforcing bar connects batch muscle 14 and deflects away from rolling wheel 3, first directive wheel 2 or second directive wheel 10, has guaranteed the stable operation of this bending machine.The cell wall of described spill guiding groove 3-1 is provided with a plurality of bar shaped fin 3-2, by bar shaped fin 3-2 is set, strengthened rolling wheel 3, first directive wheel 2 and second directive wheel 10 and inverted arch reinforcing bar connect the frictional force between batch muscle 14, make rolling wheel 3, first directive wheel 2 and second directive wheel 10 connect quicker that batch muscle 14 moves along the inverted arch reinforcing bar, and because this bending machine is to connect batch muscle 14 along the inverted arch reinforcing bar to move from bottom to top, also can overcomes support panel 1 and be installed in the falling tendency that the parts on the support panel 1 produce because of gravity by being provided with bar shaped fin 3-2.
As shown in Figure 2, the line of the bearing of trend of described adjustment hole 8 and first directive wheel 2 and second directive wheel 10 is perpendicular.Described first directive wheel 2, second directive wheel 10 and rolling wheel 3 are isosceles triangle and distribute.It is more even to make that like this inverted arch reinforcing bar after continuous roll extrusion connects the bend ratio of batch muscle 14.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, every according to the technology of the present invention essence to any simple modification, change and equivalent structure transformation that above embodiment does, all still belong in the protection domain of technical solution of the present invention.
Claims (10)
1. the tunnel invert reinforcing bar connects a batch muscle bending machine, it is characterized in that: comprise support panel (1), rolling shaft (7), be used for to drive the driving mechanism (6) that rolling shaft (7) rotates and be used for promoting rolling shaft (7) mobile and the inverted arch reinforcing bar connect the pusher (4) that a batch muscle (14) carries out pre-bending, one end of described support panel (1) is equipped with first directive wheel (2), the other end of described support panel (1) is equipped with second directive wheel (10), offer on the described support panel (1) for rolling shaft (7) and stretch into and be used for the inverted arch reinforcing bar is connect the adjustment hole (8) that a batch muscle (14) degree of crook is regulated, described adjustment hole (8) is arranged between first directive wheel (2) and second directive wheel (10), and be positioned at a side of first directive wheel (2) and second directive wheel (10) line, described rolling shaft (7) is gone up and the position that is positioned at described adjustment hole (8) is equipped with the bearing (9) that cooperates for described pusher (4) butt, one end of described rolling shaft (7) is equipped with for the inverted arch reinforcing bar being connect a batch muscle (14) rolling wheel (3) of roll extrusion continuously, the other end of described rolling shaft (7) is connected with driving mechanism (6), described first directive wheel (2), second directive wheel (10) and rolling wheel (3) all are positioned at the leading flank of support panel (1), and the trailing flank of described support panel (1) is provided with the chute (13) that slides with rolling shaft (7) for driving mechanism (6).
2. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: be provided with in the described adjustment hole (8) be used to the back-moving spring (11) that rolling shaft (7) is resetted, described rolling shaft (7) is positioned between back-moving spring (11) and the pusher (4), one end of described back-moving spring (11) is installed on the hole wall of adjustment hole (8), and the other end of described back-moving spring (11) is connected with bearing (9).
3. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: described pusher (4) comprises the bracing frame (4-1) that is connected with support panel (1) and the hydraulic jack (4-2) that is connected with bracing frame (4-1), the outer end of described hydraulic jack (4-2) piston rod (4-2-1) penetrates in the bracing frame (4-1), be provided with positioning regulator (4-3) between described rolling shaft (7) and the bracing frame (4-1), described positioning regulator (4-3) comprises screw rod (4-3-1) and is enclosed within nut (4-3-2) on the screw rod (4-3-1), one end of described screw rod (4-3-1) and piston rod (4-2-1) connect, and the other end of described screw rod (4-3-1) penetrates support panel (1) and stretches in the adjustment hole (8) and cooperates with bearing (9) butt.
4. tunnel invert reinforcing bar according to claim 3 connects a batch muscle bending machine, it is characterized in that: be connected with handle (5) on the described hydraulic jack (4-2).
5. tunnel invert reinforcing bar according to claim 3 connects a batch muscle bending machine, it is characterized in that: described support panel (1) is provided with handle (12).
6. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: described driving mechanism (6) comprises motor (6-1) and reductor (6-3), the output shaft of described motor (6-1) is connected by the power shaft of flexible drive axle (6-2) with reductor (6-3), described rolling shaft (7) is connected with the output shaft of reductor (6-3), and described reductor (6-3) is installed in the trailing flank of support panel (1) and is positioned at described chute (13).
7. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: be provided with on the outer circumference surface of described rolling wheel (3), first directive wheel (2) and second directive wheel (10) with the inverted arch reinforcing bar and connect the suitable spill guiding groove (3-1) of a batch muscle (14).
8. tunnel invert reinforcing bar according to claim 7 connects a batch muscle bending machine, it is characterized in that: the cell wall of described spill guiding groove (3-1) is provided with a plurality of bar shaped fins (3-2).
9. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: the line of the bearing of trend of described adjustment hole (8) and first directive wheel (2) and second directive wheel (10) is perpendicular.
10. tunnel invert reinforcing bar according to claim 1 connects a batch muscle bending machine, it is characterized in that: described first directive wheel (2), second directive wheel (10) and rolling wheel (3) are isosceles triangle and distribute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310306749.4A CN103341570B (en) | 2013-07-19 | 2013-07-19 | Tunnel inverted arch rebar connecting rib bending machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310306749.4A CN103341570B (en) | 2013-07-19 | 2013-07-19 | Tunnel inverted arch rebar connecting rib bending machine |
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| CN103341570A true CN103341570A (en) | 2013-10-09 |
| CN103341570B CN103341570B (en) | 2015-04-08 |
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| CN106238619A (en) * | 2016-08-31 | 2016-12-21 | 张家港市华扬冶金机械有限公司 | A kind of Portable low-pressure cable flector |
| CN106734739A (en) * | 2016-12-22 | 2017-05-31 | 中铁五局集团有限公司 | A kind of light steel bar bending machine and its operating method |
| CN108543888A (en) * | 2018-06-01 | 2018-09-18 | 南京理工大学 | One kind being convenient for fixed portable angle-bender |
| CN109365673A (en) * | 2018-10-18 | 2019-02-22 | 中铁十局集团第四工程有限公司 | A kind of tunnel double-lining reinforcing bar automatic charging pre-bending device and its application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109365673A (en) * | 2018-10-18 | 2019-02-22 | 中铁十局集团第四工程有限公司 | A kind of tunnel double-lining reinforcing bar automatic charging pre-bending device and its application method |
| CN109365673B (en) * | 2018-10-18 | 2024-03-29 | 中铁十一局集团第四工程有限公司 | Automatic feeding pre-bending device for tunnel secondary lining steel bars and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN103341570B (en) | 2015-04-08 |
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