Bracket-free construction method for widening and rebuilding old reinforced concrete bridge

Abstract

The invention discloses a support-free construction method for widening and rebuilding a reinforced concrete form old bridge. The support-free construction method comprises the following steps that firstly, steel filling blocks are transported; secondly, steel filling blocks are installed; the steel filling blocks are horizontally transported in the box girder through the box girder sliding system, so that the steel filling blocks can be rapidly transported into the installation box, meanwhile, the inclined web sliding system is installed in the installation box, the steel filling blocks are rapidly transported to the installation position through the inclined web sliding system and located, installation of the steel filling blocks is facilitated, and the installation efficiency is improved. According to the method, the problems of transferring, mounting and positioning the steel filling blocks in the narrow space in the box girder and the mounting box are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge expansion construction, and in particular to a support-free construction method for widening and rebuilding an old steel-concrete bridge. Background Art

[0002] With the increase of transportation demand in my country, widening and reconstruction of old bridges has gradually become an important direction of urban construction. The methods of bridge reconstruction and widening include the following:

[0003] (1) Adding reinforced concrete cantilever beams is the simplest method for bridge widening and reconstruction, and can be used together with other bridge reinforcement methods.

[0004] (2) Add side beams. After removing the railings and sidewalk slabs on one side (or both sides), add side beams on one side (or both sides) to achieve the purpose of widening the bridge.

[0005] (3) Adding a main beam: This method is generally used for old bridges that need to be widened and have their load-bearing capacity increased. A new main beam with greater rigidity is added to reduce the lateral distribution coefficient of the load on the main beam or arch rib of the original bridge, thereby increasing the bridge's load-bearing capacity while widening the bridge.

[0006] When a single-box multi-chamber concrete beam bridge uses steel structure flange plates to widen the bridge deck, the newly added steel structure flange plates need to be equipped with steel filler blocks inside the existing concrete beams to fix them with the external arc nodes. However, in the prior art solution of setting a steel structure cantilever beam on the outside of the concrete beam, the steel filler blocks cannot be quickly transported to the installation box during construction. At the same time, the steel filler blocks cannot be positioned during installation, which increases the complexity of installation. Therefore, improvement is urgently needed. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a support-free construction method for widening and rebuilding an old steel-concrete bridge. The steel filling blocks are horizontally transported in the box girder through a box girder sliding system, so that the steel filling blocks can be quickly transported to an installation box. At the same time, an inclined web sliding system is installed in the installation box. The steel filling blocks are quickly transported to the installation position and positioned through the inclined web sliding system, which facilitates the installation of the steel filling blocks.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A support-free construction method for widening and rebuilding an old steel-concrete bridge comprises the following steps:

[0010] Step 1: Transport of steel fill blocks;

[0011] First, install the box girder sliding system in the box girder, and then place the steel filling blocks on the box girder sliding system. The box girder sliding system can slide longitudinally and transversely. When moving in the same box girder, the box girder sliding system drives the steel filling blocks to move longitudinally. When moving in two adjacent box girders, the box girder sliding system drives the steel filling blocks to move transversely through the manhole. The box girder sliding system finally transports the steel filling blocks to the installation box through longitudinal and transverse conversion;

[0012] Step 2: Installation of steel filler blocks;

[0013] After the steel filler blocks are transported to the installation box through the box girder sliding system, the inclined web sliding system is installed in the installation box, and the inclined web installation operation ladder is used. Then the steel filler blocks are placed on the inclined web sliding system, and the inclined web sliding system drives the steel filler blocks to move up along the inclined web to the installation position. The steel filler blocks are installed, and the operating ladder is convenient for the installation personnel to work.

[0014] Furthermore, the box beam sliding system includes a longitudinal sliding mechanism and a transverse sliding mechanism. The longitudinal sliding mechanism is installed in the longitudinal box beam, and the longitudinal sliding mechanism drives the steel filling blocks to move along the longitudinal box beam. The transverse sliding mechanism is installed in the adjacent transverse box beam, and the transverse sliding mechanism drives the steel filling blocks to move along the transverse box beam.

[0015] Furthermore, the longitudinal sliding mechanism includes a longitudinal sliding trolley, a longitudinal sliding track, a longitudinal pad beam and a longitudinal pad block, the longitudinal pad beam is installed on the longitudinal pad block, the longitudinal sliding track is installed on the longitudinal pad beam, and the longitudinal sliding trolley is installed on the longitudinal sliding track and moves along the longitudinal sliding track.

[0016] Furthermore, the transverse sliding mechanism includes a transverse trolley, a transverse rail, a transverse pad beam and a transverse pad block. The transverse pad beam is installed on the transverse pad block, and the transverse rail is installed on the transverse pad beam. The height difference between the transverse rail and the longitudinal rail is the height of the longitudinal trolley or the transverse trolley, and the transverse trolley moves along the transverse rail.

[0017] Further, the detailed steps of step one are:

[0018] (1) First, install the longitudinal pads in the longitudinal box beam, install the longitudinal pads on the longitudinal pads, install the longitudinal rails on the longitudinal pads, and install the longitudinal trolley on the longitudinal rails;

[0019] (2) Then install a transverse pad in the transverse box beam, install a transverse pad on the transverse pad, and install a transverse track on the transverse pad. The height of the transverse track is higher than the height of the longitudinal track by a longitudinal trolley. At this time, the longitudinal trolley and the transverse track are at the same level;

[0020] (3) The transverse trolley stops on the longitudinal trolley, and the steel filling blocks are installed on the transverse trolley. The longitudinal trolley drives the transverse trolley and the steel filling blocks to move along the longitudinal track. When the trolley moves to the manhole of the longitudinal box girder, it stops. At this time, the transverse trolley can just move to the transverse track. The transverse trolley drives the steel filling blocks to move along the transverse track, thereby transporting the steel filling blocks to the installation box.

[0021] Furthermore, the inclined web sliding system includes a slideway, a skateboard, a sliding trolley, a traction unit, a lateral adjustment unit and a vertical adjustment unit. The slideway is arranged in an installation box, the sliding trolley is installed on the slideway by sliding the skateboard, the steel filling block is installed on the sliding trolley, the traction unit is used to control the sliding of the sliding trolley, the lateral adjustment unit is used to adjust the installation position of the steel filling block, the vertical adjustment unit is installed on the sliding trolley, and the vertical adjustment unit is used to adjust the installation angle of the steel filling block.

[0022] Further, the detailed steps of step 2 are:

[0023] (1) First, use the inclined web to install the inclined slideway in the installation box, and construct the steel filling block according to the actual hole spacing on site, and drill anchor holes on the steel filling block;

[0024] (2) Install the sliding trolley and the slide plate onto the slideway, then install the steel filler block with the anchor hole drilled onto the sliding trolley, and fix the steel filler block by the positioning unit;

[0025] (3) The steel filling block is lifted by the vertical adjustment unit on the sliding trolley so that the bottom of the steel filling block is suspended in the air, and the traction unit is installed. The sliding trolley is pulled by the traction unit to move along the slideway, and the sliding trolley drives the steel filling block to slide along the slideway to the designed position;

[0026] (4) The slide plate is adjusted laterally by the transverse adjustment unit, and the slide plate drives the steel filler block to move, thereby adjusting the steel filler block to an appropriate position, and then the inclination angle of the steel filler block is adjusted by the vertical adjustment unit to ensure the alignment accuracy of the steel filler block;

[0027] (5) Finally, install anchor rods to fix the steel filler blocks, remove the inclined web sliding system, pour epoxy mortar, and complete the installation of the steel filler blocks.

[0028] Furthermore, the traction unit adopts a longitudinal guide chain to enable the slide plate to move along the slideway.

[0029] Furthermore, the lateral adjustment unit adopts a lateral guide chain to achieve lateral adjustment of the skateboard.

[0030] Furthermore, the vertical adjustment unit includes a threaded sleeve and a threaded rod. The threaded rod is installed in the threaded sleeve. The threaded rod can be lifted and lowered along the threaded sleeve. The top of the threaded rod is connected to the steel filling block. The angle of the steel filling block is adjusted by lifting and lowering the threaded rod.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] In the present invention, the steel filling blocks are horizontally transported in the box beam through the box beam sliding system, so that the steel filling blocks can be quickly transported to the installation box. At the same time, the inclined web sliding system is installed in the installation box. The steel filling blocks are quickly transported to the installation position and positioned through the inclined web sliding system, which is convenient for the installation of the steel filling blocks.

[0033] In the present invention, the longitudinal track, longitudinal trolley, transverse track and transverse trolley are used to transport the steel filling blocks in the box beam. After the steel filling blocks are transported to the installation box, the steel filling blocks are pulled to the installation position by the lower web sliding system, and are positioned and installed. The existing space in the box beam and the installation box is effectively utilized, manpower and machinery investment are saved, construction reliability is effectively ensured, and rapid installation of steel structures of about 1 t can be achieved in a narrow box. The construction efficiency is high, the alignment is accurate, the personnel investment is small, and the operation risk is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings:

[0035] Figure 1 It is a structural schematic diagram of a support-free construction method for widening and rebuilding an old steel-concrete bridge according to the present invention;

[0036] Figure 2 It is a structural schematic diagram of the longitudinal sliding mechanism in the present invention;

[0037] Figure 3 It is a structural schematic diagram of the lateral sliding mechanism in the present invention;

[0038] Figure 4 It is a structural schematic diagram of the conversion between the longitudinal sliding mechanism and the transverse sliding mechanism in the present invention;

[0039] Figure 5 It is a structural schematic diagram of the inclined web sliding system of the present invention;

[0040] Figure 6 It is a side view of the inclined web sliding system of the present invention;

[0041] Figure 7 A top view of the inclined web sliding system of the present invention;

[0042] Figure 8 It is the motion diagram of the inclined web sliding system in the present invention.

[0043] In the figure: 10-box girder sliding system; 11-longitudinal movement trolley; 12-longitudinal movement track; 13-longitudinal pad beam; 14-longitudinal pad block; 15-transverse movement trolley; 16-transverse movement track; 17-transverse pad beam; 18-transverse pad block; 20-inclined web sliding system; 21-slideway; 22-slide plate; 23-longitudinal guide chain; 24-transverse guide chain; 25-operating ladder; 26-threaded casing; 27-threaded rod; 28-sliding trolley; 29-docking plate; 30-steel filling block. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0045] like Figures 1 to 8 As shown, a support-free construction method for widening and rebuilding an old steel-concrete bridge of the present invention is shown. First, a box girder sliding system 10 is installed in the box girder, and then a steel filling block 30 is placed on the box girder sliding system 10. The steel filling block 30 enters from the hole in the middle web top plate. The box girder sliding system 10 can slide longitudinally and transversely. When moving in the same box girder, the steel filling block 30 is driven to move longitudinally by the box girder sliding system 10. When moving in two adjacent box girders, the box girder sliding system 10 drives the steel filling block 30 to move transversely through the manhole. The box girder sliding system 10 finally transports the steel filling block 30 to the installation site through longitudinal and transverse conversion. In the box, after the steel filling block 30 is transported to the installation box through the box girder sliding system 10, the inclined web sliding system 20 is installed in the installation box, and the inclined web installation operating ladder 25 is used. Then the steel filling block 30 is placed on the inclined web sliding system 20, and the inclined web sliding system 20 drives the steel filling block 30 to move up along the inclined web to the installation position, and the steel filling block 30 is installed. The operating ladder 25 is convenient for the installation personnel to work, and the obliquely installed operating ladder 25 and the horizontal steps ensure that the operating personnel have sufficient working space in the narrow space of the side box, especially without affecting the positioning and fine-tuning installation construction of the steel filling block 30.

[0046] The present invention uses the box girder sliding system 10 to transport the steel filling blocks 30 horizontally in the box girder, so that the steel filling blocks 30 can be quickly transported to the installation box, and at the same time, the inclined web sliding system 20 is installed in the installation box. The steel filling blocks 30 are quickly transported to the installation position and positioned by the inclined web sliding system 20, which facilitates the installation of the steel filling blocks 30.

[0047] The box beam sliding system 10 includes a longitudinal sliding mechanism and a transverse sliding mechanism. The longitudinal sliding mechanism is installed in the longitudinal box beam, and the longitudinal sliding mechanism drives the steel filling block 30 to move along the longitudinal box beam. The transverse sliding mechanism is installed in the adjacent transverse box beam, and the transverse sliding mechanism drives the steel filling block 30 to move along the transverse box beam.

[0048] Specifically, the longitudinal sliding mechanism includes a longitudinal moving trolley 11, a longitudinal moving rail 12, a longitudinal pad beam 13 and a longitudinal pad block 14. The longitudinal pad block 14 is installed in the longitudinal box beam, the longitudinal pad beam 13 is installed on the longitudinal pad block 14, the longitudinal moving rail 12 is installed on the longitudinal pad beam 13, and the longitudinal moving trolley 11 is installed on the longitudinal moving rail 12 and moves along the longitudinal moving rail 12.

[0049] The transverse sliding mechanism includes a transverse trolley 15, a transverse rail 16, a transverse pad 16 and a transverse pad 18. The transverse pad 18 is installed in the transverse box beam, the transverse beam 16 is installed on the transverse pad 18, and the transverse rail 16 is installed on the transverse pad beam 16. The height difference between the transverse rail 16 and the longitudinal rail 12 is the height of the longitudinal trolley 11 or the transverse trolley 15, and the transverse trolley 15 moves along the transverse rail 16.

[0050] Due to the influence of the weight, size and size of the manhole of the steel filling block 30, the steel filling block 30 is transported by a box girder sliding system 10. The box girder sliding system 10 is composed of a longitudinal moving trolley 11, a transverse moving trolley 15, a longitudinal moving track 12 and a transverse moving track 16. In order to realize the conversion of the longitudinal and transverse directions, the longitudinal moving track 12 and the transverse moving track 16 are set to be one high and one low, and the height difference is the height of a longitudinal moving trolley 11 or a transverse moving trolley 15, which is achieved by stacking the longitudinal moving trolley 11 and the transverse moving trolley 15 up and down. The longitudinal moving trolley 11 and the transverse moving trolley 15 have the same structure, and only the moving direction is different. They can be shared through transportation during construction.

[0051] The inclined web sliding system 20 includes a slide 21, a slide plate 22, a sliding trolley 28, a traction unit, a lateral adjustment unit and a vertical adjustment unit. The slide 21 is arranged in an installation box. The sliding trolley 28 is slidably installed on the slide 21 through the slide plate 22. The steel filling block 30 is installed on the sliding trolley 28. The traction unit is used to control the sliding of the sliding trolley 28. The lateral adjustment unit is used to adjust the installation position of the steel filling block 30. The vertical adjustment unit is installed on the sliding trolley 28. The vertical adjustment unit is used to adjust the installation angle of the steel filling block 30.

[0052] The vertical adjustment unit includes a threaded sleeve 26 and a threaded rod 27. The threaded rod 27 is installed in the threaded sleeve 26. The threaded rod 27 can be raised and lowered along the threaded sleeve 26. The top of the threaded rod 27 is inserted into the bolt hole of the transported steel filling block 30 through a lifted weighing steel rod, thereby being connected to the steel filling block 30. The angle of the steel filling block 30 is adjusted by raising and lowering the threaded rod 27.

[0053] In this embodiment, the sliding trolley 28 is a left-right separated frame structure, which is fixed by bolts of the front and rear docking plates 29. When the steel filling block 30 is locked and installed, the bolting is released, the separated sliding trolley 28 is removed and reset to both sides, and the next steel filling block 30 is installed repeatedly.

[0054] In this embodiment, the slide plate 22 is made of polytetrafluoroethylene to reduce friction between the sliding trolley 28 and the slide plate 22 .

[0055] Step 1, transport of steel filler block 30;

[0056] (1) First, a longitudinal pad 14 is installed in the longitudinal box beam, a longitudinal pad beam 13 is installed on the longitudinal pad 14, a longitudinal movement track 12 is installed on the longitudinal pad beam 13, and a longitudinal movement trolley 11 is installed on the longitudinal movement track 12;

[0057] (2) Then install a transverse pad 18 in the transverse box beam, install a transverse pad beam 16 on the transverse pad 18, and install a transverse track 16 on the transverse pad beam 16. The height of the transverse track 16 is higher than the height of the longitudinal track 12 by a longitudinal trolley 11. At this time, the longitudinal trolley 11 and the transverse track 16 are in the same horizontal state;

[0058] (3) The transverse trolley 15 stops on the longitudinal trolley 11, and the steel filling block 30 is installed on the transverse trolley 15. The longitudinal trolley 11 drives the transverse trolley 15 and the steel filling block 30 to move along the longitudinal track 12. When it moves to the manhole of the longitudinal box girder, it stops. At this time, the transverse trolley 15 can be moved to the transverse track 16. The transverse trolley 15 drives the steel filling block 30 to move along the transverse track 16, thereby transporting the steel filling block 30 to the installation box.

[0059] Step 2: installing the steel filler block 30;

[0060] (1) First, install the slideway 21 in the installation box, and construct the steel filling block 30 according to the actual hole spacing on site, and drill anchor holes on the steel filling block 30;

[0061] (2) Install the sliding trolley 28 and the slide plate 22 onto the slideway 21, then install the steel filler block 30 with the anchor hole drilled onto the slide, and fix the steel filler block 30 by the positioning unit;

[0062] (3) The steel filling block 30 is lifted by the vertical adjustment unit on the sliding trolley 28 so that the bottom of the steel filling block 30 is suspended in the air, and the traction unit is installed. The sliding trolley 28 is pulled by the traction unit to move along the slideway 21, and the sliding trolley 28 drives the steel filling block to slide along the slideway 21 to the designed position;

[0063] (4) The slide plate 22 is adjusted laterally by the transverse adjustment unit, and the slide plate 22 drives the steel filling block 30 to move, thereby adjusting the steel filling block 30 to an appropriate position, and then the inclination angle of the steel filling block 30 is adjusted by the vertical adjustment unit to ensure the alignment accuracy of the steel filling block 30;

[0064] (5) Finally, anchor rods are installed to fix the steel filling blocks 30 , the inclined web sliding system 20 is removed, and epoxy mortar is poured to complete the installation of the steel filling blocks 30 .

[0065] In the present invention, through the above steps, the longitudinal track 12, the longitudinal trolley 11, the transverse track 16, and the transverse trolley 15 are used in the box beam to transport the steel filling block 30 in the box beam. After the steel filling block 30 is transported to the installation box, the inclined web sliding system 20 is used to pull the steel filling block 30 to the installation position, position it, and install it, effectively utilizing the existing space in the box beam and the installation box, saving manpower and mechanical investment, effectively ensuring construction reliability, and ensuring that a steel structure of about 1 t can be quickly installed in a narrow box. The construction efficiency is high, the alignment is accurate, the personnel investment is small, and the operation risk is low.

[0066] The implementation methods of the present invention are not limited to these. According to the above-mentioned embodiments of the present invention, by using conventional technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the present invention and without conflict, the above-mentioned preferred embodiments may also be modified, replaced or combined in various other forms, and the other embodiments obtained all fall within the scope of protection of the present invention.

Claims

1. A non-support construction method for widening and rebuilding an old steel-concrete bridge, characterized in that The following steps are involved: Step 1: Transport of steel fill blocks; First, install the box girder sliding system in the box girder, and then place the steel filling blocks on the box girder sliding system. The box girder sliding system can slide longitudinally and transversely. When moving in the same box girder, the box girder sliding system drives the steel filling blocks to move longitudinally. When moving in two adjacent box girders, the box girder sliding system drives the steel filling blocks to move transversely through the manhole. The box girder sliding system finally transports the steel filling blocks to the installation box through longitudinal and transverse conversion; Step 2: Installation of steel filler blocks; After the steel filler blocks are transported to the installation box through the box girder sliding system, the inclined web sliding system is installed in the installation box, and the inclined web installation operation ladder is used. Then the steel filler blocks are placed on the inclined web sliding system, and the inclined web sliding system drives the steel filler blocks to move up along the inclined web to the installation position. The steel filler blocks are installed, and the operating ladder is convenient for the installation personnel to work.

2. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 1 is characterized by: The box beam sliding system includes a longitudinal sliding mechanism and a transverse sliding mechanism. The longitudinal sliding mechanism is installed in the longitudinal box beam, and the longitudinal sliding mechanism drives the steel filling blocks to move along the longitudinal box beam. The transverse sliding mechanism is installed in the adjacent transverse box beam, and the transverse sliding mechanism drives the steel filling blocks to move along the transverse box beam.

3. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 2 is characterized by: The longitudinal sliding mechanism includes a longitudinal sliding trolley, a longitudinal sliding track, a longitudinal pad beam and a longitudinal pad block, the longitudinal pad beam is installed on the longitudinal pad block, the longitudinal sliding track is installed on the longitudinal pad beam, and the longitudinal sliding trolley is installed on the longitudinal sliding track and moves along the longitudinal sliding track.

4. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 3 is characterized in that: The transverse sliding mechanism includes a transverse trolley, a transverse rail, a transverse pad beam and a transverse pad block. The transverse beam is installed on the transverse pad block, and the transverse rail is installed on the transverse beam. The height of the transverse rail and the longitudinal rail differs by the height of the longitudinal trolley or the transverse trolley, and the transverse trolley moves along the transverse rail.

5. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 4 is characterized in that The detailed steps of step one are: (1) First, install the longitudinal pads in the longitudinal box beam, install the longitudinal pads on the longitudinal pads, install the longitudinal rails on the longitudinal pads, and install the longitudinal trolley on the longitudinal rails; (2) Then install a transverse pad in the transverse box beam, install a transverse pad on the transverse pad, and install a transverse track on the transverse pad. The height of the transverse track is higher than the height of the longitudinal track by a longitudinal trolley. At this time, the longitudinal trolley and the transverse track are at the same level; (3) The transverse trolley stops on the longitudinal trolley, and the steel filling blocks are installed on the transverse trolley. The longitudinal trolley drives the transverse trolley and the steel filling blocks to move along the longitudinal track. When the trolley moves to the manhole of the longitudinal box girder, it stops. At this time, the transverse trolley can just move to the transverse track. The transverse trolley drives the steel filling blocks to move along the transverse track, thereby transporting the steel filling blocks to the installation box.

6. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 1 is characterized in that: The inclined web sliding system includes a slide, a skateboard, a sliding trolley, a traction unit, a lateral adjustment unit and a vertical adjustment unit. The slide is arranged in an installation box, the sliding trolley is slidably installed on the slide through the skateboard, and the steel filling block is installed on the sliding trolley. The traction unit is used to control the sliding of the sliding trolley, the lateral adjustment unit is used to adjust the installation position of the steel filling block, and the vertical adjustment unit is installed on the sliding trolley. The vertical adjustment unit is used to adjust the installation angle of the steel filling block.

7. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 6 is characterized in that The detailed steps of step 2 are: (1) First, use the inclined web to install the inclined slideway in the installation box, and construct the steel filling block according to the actual hole spacing on site, and drill anchor holes on the steel filling block; (2) Install the sliding trolley and the slide plate onto the slideway, then install the steel filler block with the anchor hole drilled onto the sliding trolley, and fix the steel filler block by the positioning unit; (3) The steel filling block is lifted by the vertical adjustment unit on the sliding trolley so that the bottom of the steel filling block is suspended in the air, and the traction unit is installed. The sliding trolley is pulled by the traction unit to move along the slideway, and the sliding trolley drives the steel filling block to slide along the slideway to the designed position; (4) The slide plate is adjusted laterally by the transverse adjustment unit, and the slide plate drives the steel filler block to move, thereby adjusting the steel filler block to an appropriate position, and then the inclination angle of the steel filler block is adjusted by the vertical adjustment unit to ensure the alignment accuracy of the steel filler block; (5) Finally, install anchor rods to fix the steel filler blocks, remove the inclined web sliding system, pour epoxy mortar, and complete the installation of the steel filler blocks.

8. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 6 is characterized by: The traction unit uses a longitudinal guide chain to enable the slide plate to move along the slideway.

9. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 6 is characterized by: The lateral adjustment unit uses a lateral guide chain to achieve lateral adjustment of the slide plate.

10. The method for widening and rebuilding an old steel-concrete bridge without support according to claim 6 is characterized by: The vertical adjustment unit includes a threaded sleeve and a threaded rod. The threaded rod is installed in the threaded sleeve and can be lifted and lowered along the threaded sleeve. The top of the threaded rod is connected to the steel filling block. The angle of the steel filling block is adjusted by lifting and lowering the threaded rod.

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