CN211973152U - Large-tonnage box girder erection construction system capable of realizing height control - Google Patents
Large-tonnage box girder erection construction system capable of realizing height control Download PDFInfo
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- CN211973152U CN211973152U CN202020490669.4U CN202020490669U CN211973152U CN 211973152 U CN211973152 U CN 211973152U CN 202020490669 U CN202020490669 U CN 202020490669U CN 211973152 U CN211973152 U CN 211973152U
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Abstract
The utility model discloses a large-tonnage box girder erection construction system for realizing height control, which comprises a bridge girder erection machine, a transfer jack for jacking a box girder when the box girder moves, a self-propelled girder-carrying portal frame for carrying the box girder, a rail-bearing girder for supporting the self-propelled girder-carrying portal frame to run and a winch for pulling the rail-bearing girder to run along the pier erection direction; the number of the rail bearing beams is two; the self-propelled beam-carrying portal frame comprises a walking mechanism and a main bearing beam, wherein the main beam is of a portal structure, supporting legs of the walking mechanism are of a telescopic structure, and a three-dimensional beam-falling sliding device for bearing a box beam is arranged on the main bearing beam. The utility model discloses a case roof beam erects system carries the roof beam portal and transports the erector that the jack accomplished the case roof beam through the support rail roof beam, self-propelled, has avoided directly erectting through the bridge girder erection machine, and then has eliminated the bridge girder erection machine and has erect the minimum height restriction occasionally of case roof beam, has guaranteed the safety when the case roof beam erects.
Description
Technical Field
The utility model relates to a bridge engineering technical field, in particular to realize high control's large-tonnage box girder erection construction system.
Background
The box roof beam of general big tonnage (like 900 tons of box roof beams) is prefabricated through the beam yard, and roof beam is transported to the fortune roof beam car, 900 tons of bridge girder erection machine frame roof beam, nevertheless because bridge girder erection machine needs to satisfy box roof beam and feeds the roof beam, falls headroom requirements such as roof beam, minimum height restriction when bridge girder erection machine erects the box roof beam, if: some railway pier box girders are arranged under a high-voltage line, and the requirement of safety distance under the high-voltage line cannot be met by adopting the traditional 900-ton box girder bridge erecting machine girder erecting mode.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides a realize high control's large-tonnage box girder and erects construction system, carries the roof beam portal and transports the erection that the jack accomplished the box girder through the support rail roof beam, self-propelled, avoids directly erectting through the bridging machine, and then eliminates the bridging machine and erects the box girder minimum high restriction occasionally, guarantees the safety when the box girder erects.
The purpose of the utility model is realized through the following technical scheme:
a large-tonnage box girder erection construction system for realizing height control comprises a bridge girder erection machine, a transfer jack for jacking a box girder when the box girder moves, a self-propelled girder-carrying portal frame for carrying the box girder, a rail bearing beam for supporting the self-propelled girder-carrying portal frame to run and a winch for pulling the rail bearing beam to run along the bridge pier erection direction;
the number of the rail bearing beams is two, and the two rail bearing beams are movably arranged on two sides of the bridge pier;
the self-propelled beam-carrying portal frame is provided with at least two self-propelled beam-carrying portal frames along the erection direction of piers, each self-propelled beam-carrying portal frame comprises a walking mechanism and a main bearing beam for bearing a box beam, supporting legs of the walking mechanism are of a telescopic structure, and a three-dimensional beam-falling sliding device for bearing the box beam is arranged on the main bearing beam.
Furthermore, the rail supporting beams are main beams of the girder lifting machine, the two rail supporting beams are fixedly connected in a detachable mode, the walking mechanism comprises a lower cross beam, a walking trolley and supporting legs, the lower cross beam is fixedly connected with the walking trolley, the lower ends of the supporting legs are fixedly connected with the lower cross beam, the upper ends of the supporting legs are fixedly connected with the main bearing beam, and the walking trolley is a walking trolley of a crane trolley of the girder lifting machine.
Furthermore, a plurality of rail bearing beam foundations are uniformly arranged on two sides of the bridge pier along the erection direction of the bridge pier, and sliding seat plates which facilitate the movement of the rail bearing beams are arranged on the rail bearing beam foundations.
Furthermore, an auxiliary support for ensuring the stable movement of the rail bearing beam is arranged at the center of each two piers. And the auxiliary support is provided with a steel seat plate.
Furthermore, a group of winch anchoring bases are respectively arranged on two sides of the bridge pier, each group of winch anchoring bases is composed of two winch anchoring seats, the two winch anchoring seats are respectively located at two ends of the erection direction of the rail bearing beam foundation, and anchoring steel plates are arranged on the winch anchoring seats.
Furthermore, an anchoring steel bar is arranged between the anchoring steel plate and the anchoring seat of the winch.
Furthermore, the supporting legs of the walking mechanism are of a stand column structure, telescopic sleeves are arranged outside the supporting legs and connected with the supporting legs through steel pins, the supporting legs are connected with the main bearing beam through bolts, and the telescopic sleeves are fixedly connected with the walking mechanism.
Further, the slide chair plate is of a sled-shaped structure.
Furthermore, two fixing steel plates for fixing the box girder are arranged on the main bearing beam.
The utility model has the advantages that:
the utility model discloses a case roof beam erects system carries the roof beam portal and transports the erector that the jack accomplished the case roof beam through the support rail roof beam, self-propelled, has avoided directly erectting through the bridge girder erection machine, and then has eliminated the bridge girder erection machine and has erect the minimum height restriction occasionally of case roof beam, has guaranteed the safety when the case roof beam erects.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a large-tonnage box girder erection construction system for realizing height control in an embodiment of the present invention;
fig. 2 is a schematic view of the self-propelled carrying beam portal frame carrying box beam running on the rail beam in the embodiment of the present invention;
FIG. 3 is a side view of FIG. 2;
FIG. 4 is an enlarged schematic view of detail A of FIG. 3;
fig. 5 is a schematic structural view of the self-propelled girder-carrying gantry in the embodiment of the present invention;
FIG. 6 is a schematic view showing the retractable structure of the walking mechanism according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of the position of the auxiliary support according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an auxiliary support in an embodiment of the present invention;
fig. 9 is a schematic structural view of the case beam fixed on the self-propelled girder-carrying portal frame in the embodiment of the present invention;
fig. 10 is a schematic structural view of a winch and a winch anchoring base according to an embodiment of the present invention;
FIG. 11 is a schematic view of a feeding beam of a bridge girder erection machine according to an embodiment of the present invention;
fig. 12 is a first schematic diagram of height control of a box girder according to an embodiment of the present invention;
fig. 13 is a second schematic diagram of height control of the box girder according to the embodiment of the present invention;
fig. 14 is a schematic view of the translation of the rail supporting beam in the embodiment of the present invention;
fig. 15 is a schematic view of the self-propelled girder-carrying gantry and the box girder resetting in the embodiment of the present invention;
fig. 16 is a first schematic view of the self-propelled girder-carrying portal frame in the embodiment of the present invention;
FIG. 17 is a second schematic view of the self-propelled door frame for carrying the box girder in place and retreating;
fig. 18 is a third schematic view of the self-propelled girder-carrying portal frame in the embodiment of the present invention;
in the figure, 1, a box girder; 2. a bridge girder erection machine; 3. a transfer jack; 4. self-propelled beam-carrying portal frame; 5. a rail bearing beam; 6. a winch; 7. a running mechanism; 8. a main load beam; 9. a lower cross beam; 10. a traveling trolley; 11. a support leg; 12. a rail support beam foundation; 13. an auxiliary support; 14. a winch anchoring foundation; 15. anchoring a steel plate; 16. anchoring the reinforcing steel bars; 17. a telescopic sleeve; 18. a steel pin; 19. fixing a steel plate; 20. a track.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-18, the present invention provides a technical solution:
example (b):
as shown in fig. 1-8, a large-tonnage box girder erection construction system for realizing height control comprises a bridge girder erection machine 2, a transfer jack 3 for jacking a box girder 1 when the box girder 1 moves longitudinally, a self-propelled girder-carrying door frame 4 for carrying the box girder 1, a track-bearing beam 5 for supporting the self-propelled girder-carrying door frame 4 to operate and a winch 6 for pulling the track-bearing beam 5 to operate along the pier erection direction; wherein the part marked G in figure 1 is the location of the high voltage line at the box girder of the pier.
As shown in fig. 3, two of the rail-bearing beams 5 are provided, and the two rail-bearing beams 5 are movably arranged on two sides of the bridge pier along the bridge pier erection direction; and the two rail bearing beams 5 are respectively provided with a rail 20 for the walking mechanism 7 to walk.
As shown in fig. 3, 5 and 6, the self-propelled girder-carrying portal frame 4 has two and is arranged along the bridge pier erection direction, the self-propelled girder-carrying portal frame 4 includes a walking mechanism 7 and a main bearing girder 8 for bearing the box girder 1, the main bearing girder 8 and the walking mechanism are combined to form a portal structure, the support legs 11 of the walking mechanism 7 are of a telescopic structure, and the main bearing girder 8 is provided with a three-dimensional girder-falling sliding device for bearing the box girder 1. (wherein, the three-dimensional beam-falling sliding device is a known technical means in the field, and is not described here again, and comprises a plurality of beam-falling jacks)
Further, as shown in fig. 5 and 6, the rail supporting beams 5 are main beams of a 450T beam lifter, the two rail supporting beams 5 are detachably and fixedly connected, the traveling mechanism 7 includes a lower cross beam 9, a traveling trolley 10 and supporting legs 11, the lower cross beam 9 is fixedly connected with the traveling trolley 10, the lower ends of the supporting legs 11 are fixedly connected with the lower cross beam 9, the upper ends of the supporting legs 11 are fixedly connected with the main supporting beam 8, and the traveling trolley 10 is a traveling trolley of a crane trolley of the 450T beam lifter.
Further, as shown in fig. 3 and 7, a plurality of rail bearing beam foundations 12 are evenly cast on both sides of the pier along the erection direction, and slide plate plates which facilitate the movement of the rail bearing beams 5 are arranged on the rail bearing beam foundations 12.
Further, as shown in fig. 10 and 12, a set of winch anchoring bases 14 is respectively arranged on two sides of the pier, each set of winch anchoring bases 14 is composed of two winch 6 anchoring seats, the two winch 6 anchoring seats are respectively located at two ends of the erection direction of the rail supporting beam base 12, and anchoring steel plates 15 are arranged on the winch 6 anchoring seats. The anchor seat of the winch 6 is formed by pouring concrete, and an anchor steel plate 15 is embedded in the anchor seat (the back of the anchor steel plate 15 is welded with an anchor steel bar 16, and the anchor steel bar 16 extends into the position which is not less than 30cm below the foundation surface).
Further, as shown in fig. 7 and 8, an auxiliary support 13 for ensuring stable movement of the rail beam 5 is provided at the center of each of two piers. And a steel seat plate is arranged on the auxiliary support 13. The steel seat plate is used for ensuring the stability of the rail bearing beam 5 during moving.
Further, as shown in fig. 10, an anchoring steel bar 16 is disposed between the anchoring steel plate 15 and the anchoring seat of the winch 6. The arrangement of the anchoring steel bar 16 can improve the stability of the anchoring steel plate 15 and the anchoring seat of the winch 6.
Further, as shown in fig. 6, the supporting leg 11 of the running mechanism 7 is of a column structure, a telescopic sleeve 17 is arranged outside the supporting leg 11, the telescopic sleeve 17 is connected with the supporting leg 11 through a steel pin 18, the supporting leg 11 is connected with the main carrier bar 8 through a bolt, and the telescopic sleeve 17 is fixedly connected with the running mechanism 7.
Further, the slide chair plate is of a sled-shaped structure.
Further, as shown in fig. 9, the main carrier bar 8 is provided with a fixed steel plate 19 which is used for fixing the box girder 1. When the box girder 1 falls on the main rain bearing girder 8, the fixed steel plates 19 are positioned at two sides of the box girder 1, and the height of the fixed steel plates 19 reaches the position of the ventilation opening of the box girder 1. At the moment, round steel with the diameter of 90mm-120mm penetrates through the ventilation opening of the box girder 1 and extends into the box chamber to be firmly fixed with the steel plate through bolts, so that the box girder 1 and the main bearing girder 8 are fixed, the box girder 1 is guaranteed not to slide in the moving process, and the stability of the operation process is guaranteed.
The working principle is as follows:
when the box girder is transported, firstly, laying of infrastructure is carried out, and the method specifically comprises the following steps:
1. the track-bearing beam foundation and the winch anchoring foundation are poured, wherein the track-bearing beam foundation is poured: the top surface elevations are uniformly a, so that the top surface of the foundation is ensured to be flat, and C40 concrete is poured. After the foundations are poured, two sled type sliding seat plates are fixed on each foundation to facilitate moving of the rail bearing beams, gaps of the sliding seat plates are filled with wood plates, and the sliding seat plates on two sides close to the pier bodies are connected with connection angle steel in the front and back positions of each pier to achieve a good fixing effect. Pouring the anchoring foundation of the winch: the method is characterized in that concrete is poured, a winch anchoring steel plate is embedded in a winch anchoring foundation (anchoring steel bars are welded to the back of the anchoring steel plate, and the anchoring steel bars stretch into the position, below the foundation surface, of not less than 30 cm).
2. The auxiliary support is erected, the longitudinal bridge direction position of the auxiliary support is located at the center of a pier, the transverse position of the auxiliary support is flush with the rail bearing platform foundation, the length of the auxiliary support is 2.7m, the width of the auxiliary support is consistent with that of the rail bearing platform foundation, the top surface elevations of the foundation are unified to be a, brick slag with the thickness of 50cm is adopted for replacement and tamping, and the top surface of a replacement and filling layer is 30cm lower than that of the rail bearing platform foundation. After the foundation is made, sleepers are transversely and fully distributed on the auxiliary support foundation, wood boards are longitudinally laid, and finally a steel seat plate is arranged above the auxiliary support foundation to ensure the stability of the rail bearing beam during movement.
3. The rail bearing beams are erected, the two rail bearing beams are arranged on the rail bearing beam foundation at the front end (one end of a bridge girder erection machine feeding beam is referred to herein), one rail bearing beam is supported by 2-3 rail bearing beam foundations, and the two rail bearing beams are reinforced to prevent the rail bearing beams from local deformation.
4. The winch is erected and installed on the anchoring steel plate, and in order to ensure that the rail bearing beam slides to be close to the 1921# pier as far as possible, the steering pulley is installed at the position close to the 1921# pier, so that the side traction of the winch is realized.
5. The self-propelled beam-carrying portal frame is installed and spliced on site, and specifically comprises the following steps: the method comprises the steps of firstly firmly assembling a running mechanism and a rail of a rail bearing beam, then connecting a supporting leg and a lower cross beam through a high-strength bolt, after the supporting leg is stably installed, hoisting a main bearing beam onto the supporting leg through a crane, and connecting the main bearing beam and the supporting leg through the high-strength bolt.
The erection of box girders is started after the laying of the infrastructure is finished, and the method specifically comprises the following steps:
1. and feeding the beams through a bridge girder erection machine, as shown in fig. 11, slowly lifting and hanging the box girder on a bridge pier cushion by the bridge girder erection machine, and selecting the feeding beams between 1913# and 1914# bridge girder erection machines according to the actual situation on site, wherein a high-voltage line is arranged right above the 1916# pier, and a municipal road is arranged between the 1914# and 1915# piers. (bridge girder erection machine retreats:.) after the box girder falls to the stone pad, the main hook of the lifting beam of the bridge girder erection machine is dismantled, the auxiliary supporting legs and the lower guide beam are utilized to lift the lower guide beam to be suspended, the rear supporting legs of the lower guide beam are dismantled, the lower guide beam retreats to the position right below the bridge girder erection machine, and the bridge girder erection machine retreats to the box girder erected in the next hole and is firmly supported and fixed (the step is the concrete operation of the bridge girder erection machine, the bridge girder erection machine is a technology known in the field, so the technical name is not explained).
2. And controlling the height of the box girder, namely, lifting the lower guide girder to the height which can longitudinally move the main bearing girder after the bridge girder erection machine retreats in place as shown in figure 12, slowly jacking the box girder by a girder falling jack of the three-dimensional girder falling sliding device, adjusting the height of the box girder to the height which can span a pier ahead of the main bearing girder by using a temporary buttress, and descending the girder falling jack to enable the box girder to fall on the main bearing girder. And (4) observing the deformation of the main bearing cross beam, inspecting and inspecting the main steel structure connecting member, and starting the longitudinal moving operation of the bearing beam after confirming that the structure is firmly connected and the overall stability is good.
The longitudinal moving operation of the load-carrying beam is driven by a walking trolley, the front door frame and the rear door frame are linked through an electric signal line, so that the two door frames are kept synchronous in the shaping process, and the walking speed is controlled to be not more than 3m/min for slow movement.
As shown in fig. 13, after the self-propelled beam-carrying portal frame moves for one span, the position of the self-propelled beam-carrying portal frame is slowly adjusted to ensure that the position of the box beam section fulcrum is basically located at the position of the top cushion of the front pier and the rear pier, and the parking is stable. Then, a transfer jack is installed on the pier top in advance, the box girder is slowly jacked up by the transfer jack (each pier top is provided with 2 sets of (hydraulic) transfer jacks), after the self-propelled girder-carrying portal frame is emptied, the self-propelled girder-carrying portal frame is slowly moved to the nearest drain hole, the self-propelled girder-carrying portal frame is hoisted by a steel wire rope through hole, the box girder is jacked by the transfer jack continuously, and the travelling trolley is separated from the track (the self-propelled girder-carrying portal frame is integrally lifted).
3. And (4) the rail bearing beams are translated, as shown in fig. 14, after the walking trolley is confirmed to be separated from the track and suspended stably, the fixed connection structures of the two rail bearing beams are released, the rail bearing beams are dragged by a winch to move forwards slowly, the two rail bearing beams stop moving when moving to the self-propelled beam bearing gantry with the tail parts thereof positioned at the previous hole of the gantry and close to the front, and the two rail bearing beams are re-anchored and fixedly connected.
4. The self-propelled girder-carrying portal frame and the box girder are reset, as shown in fig. 15, after a rail-bearing girder is in place, a 25t crane is used for plugging in and plugging out the portal support leg telescopic sleeve upright post to adjust the height of the portal frame, the self-propelled girder-carrying portal frame is slowly vertically fallen on a track, after the accurate in-place is confirmed, the self-propelled girder-carrying portal frame is moved to the position close to the box girder supporting point at two sides, the box girder is slowly fallen by a transfer jack and falls on the self-propelled girder-carrying portal frame, and when the self-propelled girder-carrying portal frame is checked to be good in verticality and structural stability, the box girder translation operation is continuously carried out, and the operation needs to be the 'box girder height control' operation.
5. The box girder is in place, the self-propelled carrying girder portal frame retracts, as shown in fig. 16-18, after the self-propelled carrying girder portal frame carries the box girder to a designated position (firstly 1920 + 1921 #), whether the position of a longitudinal support axis of the box girder is coincided with the position of a support calibrated before the base stone is lifted is measured and checked, if the longitudinal support axis is not coincided with the position of the support calibrated before the base stone is lifted, the box girder is slowly carried, after the position of the support axis of the box girder is basically coincided with the position of the support calibrated before the base stone is lifted (the error is not more than 5 mm), a support anchor bolt is installed, a grouting template is installed on the top surface of the base stone in advance, the box girder is lifted by a transfer jack, after a main bearing beam of the portal frame is separated from the box girder, a telescopic sleeve of the upright post of the. And then detaching the high-strength bolt between the portal upright post and the portal main bearing beam, and binding a steel wire rope by using a 50t crane to lift the portal main bearing beam away from the site. The transfer jack slowly falls the roof beam, and the transfer jack increases the device that moves about freely and quickly this moment, and four tops can be moved about indulging simultaneously, and the sideslip about two tops can be controlled simultaneously around, guarantees the case roof beam and counterpoints. In the beam falling in-place process, the slow operation is only allowed, and after the beam falling reaches the designated elevation position, the support mortar is poured.
6. And repeating the steps, and after the box girder is erected, returning the rail bearing beam and the portal frame by utilizing the traction of a rear winch to carry out the erection operation of the lower hole box girder, wherein the erection operation process of the lower hole box girder is the same as the steps 1-5.
The longitudinal displacement of the box girder is realized by the transfer jack, the height control process is simple, the longitudinal displacement range is controllable, and the minimum height limit of the bridge girder erection machine is further avoided.
The utility model discloses a case roof beam erects system carries the roof beam portal and transports the erector that the jack accomplished the case roof beam through the support rail roof beam, self-propelled, has avoided directly erectting through the bridge girder erection machine, and then has eliminated the bridge girder erection machine and has erect the minimum height restriction occasionally of case roof beam, has guaranteed the safety when the case roof beam erects.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (9)
1. The utility model provides a realize high control's large-tonnage box girder and erect construction system which characterized in that: the bridge girder erection device comprises a bridge girder erection machine, a transfer jack for jacking a box girder when the box girder moves, a self-propelled girder-carrying portal frame for carrying the box girder, a rail-bearing girder for supporting the self-propelled girder-carrying portal frame to run and a winch for dragging the rail-bearing girder to run along the bridge pier erection direction;
the number of the rail bearing beams is two, and the two rail bearing beams are movably arranged on two sides of the bridge pier;
the self-propelled beam-carrying portal frame is provided with at least two self-propelled beam-carrying portal frames along the erection direction of piers, each self-propelled beam-carrying portal frame comprises a walking mechanism and a main bearing beam for bearing a box beam, supporting legs of the walking mechanism are of a telescopic structure, and a three-dimensional beam-falling sliding device for bearing the box beam is arranged on the main bearing beam.
2. The large-tonnage box girder erection construction system for realizing height control according to claim 1, characterized in that: the crane is characterized in that the rail supporting beams are main beams of a beam lifting machine, the two rail supporting beams are fixedly connected in a detachable mode, the walking mechanism comprises a lower cross beam, a walking trolley and supporting legs, the lower cross beam is fixedly connected with the walking trolley, the lower ends of the supporting legs are fixedly connected with the lower cross beam, the upper ends of the supporting legs are fixedly connected with the main bearing beams, and the walking trolley is a walking trolley of a crane trolley of the beam lifting machine.
3. The large-tonnage box girder erection construction system for realizing height control according to claim 2, characterized in that: a plurality of rail bearing beam foundations are uniformly arranged on two sides of the bridge pier along the erection direction of the bridge pier, and sliding seat plates which facilitate the movement of the rail bearing beams are arranged on the rail bearing beam foundations.
4. The large-tonnage box girder erection construction system for realizing height control according to claim 3, characterized in that: and an auxiliary support for ensuring the stable movement of the rail bearing beam is arranged at the center of each two piers.
5. The large-tonnage box girder erection construction system for realizing height control according to claim 3, characterized in that: two sides of the bridge pier are respectively provided with a group of winch anchoring bases, each group of winch anchoring bases consists of two winch anchoring seats, the two winch anchoring seats are respectively positioned at two ends of the erection direction of the rail bearing beam foundation, and the winch anchoring seats are provided with anchoring steel plates.
6. The large-tonnage box girder erection construction system for realizing height control according to claim 5, characterized in that: and an anchoring steel bar is arranged between the anchoring steel plate and the anchoring seat of the winch.
7. The large-tonnage box girder erection construction system for realizing height control according to claim 1, characterized in that: the supporting legs of the walking mechanism are of a stand column structure, telescopic sleeves are arranged outside the supporting legs and connected with the supporting legs through steel pins, the supporting legs are connected with the main bearing beam through bolts, and the telescopic sleeves are fixedly connected with the walking mechanism.
8. The large-tonnage box girder erection construction system for realizing height control according to claim 3, characterized in that: the slide chair plate is of a sled-shaped structure.
9. The large-tonnage box girder erection construction system for realizing height control according to claim 1, characterized in that: and the main bearing beam is provided with two fixed steel plates for fixing the box girder.
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| CN202020490669.4U CN211973152U (en) | 2020-04-07 | 2020-04-07 | Large-tonnage box girder erection construction system capable of realizing height control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921817A (en) * | 2021-02-04 | 2021-06-08 | 中铁五局集团有限公司 | Steel support for equivalent extension bridge girder erection machine stand column and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921817A (en) * | 2021-02-04 | 2021-06-08 | 中铁五局集团有限公司 | Steel support for equivalent extension bridge girder erection machine stand column and use method thereof |
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