A steel-concrete form old bridge widening reconstruction support-free construction method

Abstract

The application discloses a steel-mix form old bridge widening reconstruction support-free construction method, which comprises the following steps: step one, steel filling block transportation; and step two, steel filling block installation; the steel filling block is horizontally transported in a box girder through a box girder sliding system, so that the steel filling block can be quickly transported to an installation box; meanwhile, an inclined web plate sliding system is installed in the installation box; the steel filling block is quickly transported to an installation position through the inclined web plate sliding system and is positioned, so that the steel filling block is conveniently installed; and the method solves the problems of transfer and installation and positioning of the steel filling block in a narrow space in the box girder and the installation box.

Description

Technical Field

[0001] This invention relates to the field of bridge expansion construction technology, and more specifically to a scaffold-free construction method for widening and reconstructing an old steel-concrete bridge. Background Technology

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

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

[0004] (2) Add side beams. After removing the railings and sidewalks on one (or both) side, add side beams on one (or both) side to widen the bridge.

[0005] (3) Adding main beams. This method is generally used for old bridges that need to be widened and have their load-bearing capacity increased. Adding main beams with greater stiffness reduces the lateral load distribution coefficient of the original bridge's main beams or arch ribs, thereby increasing the bridge's load-bearing capacity while widening it.

[0006] When widening the bridge deck of a single-box multi-cell concrete beam bridge using steel structure flanges, the newly added steel structure flanges require steel filler blocks to be installed inside the existing concrete beams for fixing to the external curved nodes. However, in the existing technology of setting steel structure cantilever beams on the outside of the concrete beams, 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, improvements are urgently needed. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, the present invention aims to provide a scaffold-free construction method for the widening and reconstruction of old steel-concrete bridges. The method involves using a box girder sliding system to horizontally transport steel filler blocks within the box girder, enabling the steel filler blocks to be quickly transported to the installation box. Simultaneously, an inclined web sliding system is installed within the installation box to quickly transport and position the steel filler blocks, facilitating their installation.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge includes the following steps:

[0010] Step 1: Transporting steel filler blocks;

[0011] First, a box girder sliding system is installed inside the box girder. Then, steel filler blocks are placed on the box girder sliding system. The box girder sliding system can slide longitudinally and laterally. When moving within the same box girder, the box girder sliding system drives the steel filler blocks to move longitudinally. When moving between two adjacent box girders, the box girder sliding system drives the steel filler blocks to move laterally through the manhole. Through longitudinal and lateral conversion, the box girder sliding system finally transports the steel filler blocks to the installation box.

[0012] Step two, steel filler block installation;

[0013] After the steel filler blocks are transported to the installation box via the box girder sliding system, the inclined web sliding system is installed in the installation box, and the inclined web installation ladder is used to install the steel filler blocks. 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 the installation position along the inclined web for installation. The operating ladder facilitates the work of the installation personnel.

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

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

[0016] Furthermore, the lateral sliding mechanism includes a lateral trolley, a lateral track, a lateral support beam, and a lateral support block. The lateral support beam is installed on the lateral support block, and the lateral track is installed on the lateral support beam. The height difference between the lateral track and the longitudinal track is the height of either the longitudinal or lateral trolley. The lateral trolley moves along the lateral track.

[0017] Furthermore, the detailed steps of step one are as follows:

[0018] (1) First, install longitudinal pads inside the longitudinal box girder, install longitudinal pad beams on the longitudinal pads, install longitudinal moving rails on the longitudinal pad beams, and install the longitudinal moving trolley on the longitudinal moving rails;

[0019] (2) Then install transverse pads inside the transverse box girder, install transverse pad beams on the transverse pads, and install transverse tracks on the transverse pad beams. The height of the transverse tracks is higher than the height of the longitudinal tracks by one longitudinal trolley. At this time, the longitudinal trolley and the transverse tracks are at the same level.

[0020] (3) The transverse trolley stops on the longitudinal trolley, the steel filler block is installed on the transverse trolley, the longitudinal trolley drives the transverse trolley and the steel filler block to move along the longitudinal track, and stops when it moves to the manhole of the longitudinal box girder. At this time, the transverse trolley can move onto the transverse track, and the transverse trolley drives the steel filler block to move along the transverse track, thereby transporting the steel filler block into the installation box.

[0021] Furthermore, the inclined web sliding system includes a slide rail, a sliding plate, a sliding trolley, a traction unit, a lateral adjustment unit, and a vertical adjustment unit. The slide rail is set in the mounting box, and the sliding trolley is slidably installed on the slide rail via the sliding plate. The steel filler 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 filler block, and the vertical adjustment unit is installed on the sliding trolley and is used to adjust the installation angle of the steel filler block.

[0022] Furthermore, the detailed steps of step two are as follows:

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

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

[0025] (3) Lift the steel block by the vertical adjustment unit on the sliding trolley so that the bottom of the steel block is suspended. Install the traction unit and move the sliding trolley along the slide rail by the traction unit. The sliding trolley drives the steel block to slide along the slide rail to the design position.

[0026] (4) The slide plate is adjusted laterally by the lateral adjustment unit. The slide plate moves the steel filler block to the appropriate position. Then the tilt 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 bolts to fix the steel filler blocks, remove the inclined web sliding system, pour in epoxy mortar, and complete the installation of the steel filler blocks.

[0028] Furthermore, the traction unit uses a longitudinal guide chain to move the slide along the track.

[0029] Furthermore, the lateral adjustment unit uses 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 inside the threaded sleeve and can move up and down along the threaded sleeve. The top of the threaded rod is connected to the steel filler block, and the angle of the steel filler block is adjusted by moving the threaded rod up and down.

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

[0032] In this invention, the steel filler blocks are horizontally transported within the box girder using a box girder sliding system, enabling them to be quickly transported to the installation box. Simultaneously, an inclined web sliding system is installed within the installation box to quickly transport the steel filler blocks to the installation position and position them, facilitating the installation of the steel filler blocks.

[0033] This invention utilizes longitudinal tracks, longitudinal trolleys, transverse tracks, and transverse trolleys to transport steel filler blocks within the box girder. After being transported to the installation box, the steel filler blocks are pulled to the installation position and positioned and installed using a lower web sliding system. This effectively utilizes the existing space within the box girder and installation box, saving manpower and machinery input, effectively ensuring construction reliability, and enabling the rapid installation of steel structures weighing approximately 1 ton within a confined box. It offers high construction efficiency, precise positioning, low personnel input, and low operational risk. Attached Figure Description

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

[0035] Figure 1 This is a structural schematic diagram of a scaffold-free construction method for widening and reconstructing an old bridge using a steel-concrete composite structure, according to the present invention.

[0036] Figure 2 This is a schematic diagram of the longitudinal sliding mechanism in this invention;

[0037] Figure 3 This is a schematic diagram of the transverse sliding mechanism in this invention;

[0038] Figure 4 This is a schematic diagram of the structure for the conversion between the longitudinal sliding mechanism and the transverse sliding mechanism in this invention;

[0039] Figure 5 This is a schematic diagram of the inclined web sliding system in this invention;

[0040] Figure 6 This is a side view of the inclined web sliding system in this invention;

[0041] Figure 7 This is a top view of the inclined web sliding system in this invention;

[0042] Figure 8 This is a motion diagram of the inclined web sliding system in this invention.

[0043] In the diagram: 10-Box girder sliding system; 11-Longitudinal trolley; 12-Longitudinal track; 13-Longitudinal pad beam; 14-Longitudinal pad block; 15-Transverse trolley; 16-Transverse track; 17-Transverse pad beam; 18-Transverse pad block; 20-Inclined web sliding system; 21-Slide rail; 22-Slide plate; 23-Longitudinal guide chain; 24-Transverse guide chain; 25-Operating ladder; 26-Threaded sleeve; 27-Threaded rod; 28-Sliding trolley; 29-Dating plate; 30-Steel filler block. Detailed Implementation

[0044] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0045] like Figures 1 to 8 As shown, this invention provides a scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge. First, a box girder sliding system 10 is installed inside the box girder. Then, steel filler blocks 30 are placed on the box girder sliding system 10, entering through openings in the top plate of the web. The box girder sliding system 10 can slide longitudinally and laterally. When moving within the same box girder, the box girder sliding system 10 drives the steel filler blocks 30 to move longitudinally. When moving between adjacent box girders, the box girder sliding system 10 drives the steel filler blocks 30 to move laterally through manholes. Through longitudinal and lateral switching, the box girder sliding system 10 ultimately transports the steel filler blocks 30 to the designated location. Inside the box, the steel filler block 30 is transported to the installation box via the box girder sliding system 10. The inclined web sliding system 20 is then installed in the installation box, and the inclined web installation operating ladder 25 is used. The steel filler block 30 is then placed on the inclined web sliding system 20, and the inclined web sliding system 20 drives the steel filler block 30 to the installation position along the inclined web for installation. The operating ladder 25 facilitates the work of the installation personnel. The inclined installation of the operating ladder 25 and the horizontal steps ensure that the workers have sufficient working space in the narrow space of the side box, and in particular, it does not affect the alignment and fine-tuning of the steel filler block 30 during installation.

[0046] The present invention uses a box girder sliding system 10 to transport the steel filler block 30 horizontally within the box girder, enabling the steel filler block 30 to be quickly transported to the installation box. At the same time, an inclined web sliding system 20 is installed in the installation box to quickly transport the steel filler block 30 to the installation position and position it, facilitating the installation of the steel filler block 30.

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

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

[0049] The transverse sliding mechanism includes a transverse trolley 15, a transverse track 16, a transverse support beam 17, and a transverse support block 18. The transverse support block 18 is installed in the transverse box girder, the transverse support beam 17 is installed on the transverse support block 18, and the transverse track 16 is installed on the transverse support beam 17. The height difference between the transverse track 16 and the longitudinal track 12 is the height of either the longitudinal trolley 11 or the transverse trolley 15. The transverse trolley 15 moves along the transverse track 16.

[0050] Due to the limitations of the weight, size, and manhole size of the steel filler block 30, the steel filler block 30 is transported using a box girder sliding system 10. The box girder sliding system 10 consists of a longitudinal trolley 11, a transverse trolley 15, a longitudinal track 12, and a transverse track 16. To achieve the conversion between longitudinal and transverse directions, the longitudinal track 12 and the transverse track 16 are set to be one high and one low, with a height difference equal to the height of one longitudinal trolley 11 or transverse trolley 15. This is achieved by stacking the longitudinal trolley 11 and the transverse trolley 15 on top of each other. The longitudinal trolley 11 and the transverse trolley 15 have the same structure, only different directions of movement, and can be shared during construction.

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

[0052] The vertical adjustment unit includes a threaded sleeve 26 and a threaded rod 27. The threaded rod 27 is installed inside the threaded sleeve 26 and can be raised and lowered along the threaded sleeve 26. The top of the threaded rod 27 is connected to the steel filler block 30 by inserting a supporting weighing steel bar into the bolt hole of the transported steel filler block 30. The angle of the steel filler 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 to the front and rear docking plates 29. After the steel filler block 30 is locked and installed, the bolts are released, and the separated sliding trolley 28 is removed and reset to both sides, and the next steel filler block 30 is installed repeatedly.

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

[0055] Step 1: Transport 30 steel filler blocks;

[0056] (1) First, install longitudinal pads 14 inside the longitudinal box girder, install longitudinal pad beams 13 on the longitudinal pads 14, install longitudinal moving rails 12 on the longitudinal pad beams 13, and install the longitudinal moving trolley 11 on the longitudinal moving rails 12.

[0057] (2) Then install the transverse pad 18 inside the transverse box girder, install the transverse pad beam 17 on the transverse pad 18, and install the transverse track 16 on the transverse pad beam 17. 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 at the same level.

[0058] (3) The transverse trolley 15 stops on the longitudinal trolley 11. The steel filler block 30 is installed on the transverse trolley 15. The longitudinal trolley 11 drives the transverse trolley 15 and the steel filler 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 move to the transverse track 16. The transverse trolley 15 drives the steel filler block 30 to move along the transverse track 16, thereby transporting the steel filler block 30 into the installation box.

[0059] Step 2: Install steel filler block 30;

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

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

[0062] (3) The steel filler block 30 is lifted by the vertical adjustment unit on the sliding trolley 28 so that the bottom of the steel filler block 30 is suspended. The traction unit is installed and the sliding trolley 28 is moved along the slide rail 21 by the traction unit. The sliding trolley 28 drives the steel filler block to slide along the slide rail 21 to the design position.

[0063] (4) The slide plate 22 is adjusted laterally by the lateral adjustment unit. The slide plate 22 drives the steel filler block 30 to move, thereby adjusting the steel filler block 30 to an appropriate position. Then the tilt angle of the steel filler block 30 is adjusted by the vertical adjustment unit to ensure the alignment accuracy of the steel filler block 30.

[0064] (5) Finally, install the anchor rods to fix the steel filler block 30, remove the inclined web sliding system 20, pour in epoxy mortar, and complete the installation of the steel filler block 30.

[0065] Furthermore, the traction unit uses a longitudinal guide chain 23 to enable the slide plate 22 to move along the slide rail 21.

[0066] Furthermore, the lateral adjustment unit uses a lateral guide chain 24 to achieve lateral adjustment of the skateboard 22.

[0067] In this invention, through the above steps, the steel filler blocks 30 within the box girder are transported using longitudinal rails 12, longitudinal trolleys 11, transverse rails 16, and transverse trolleys 15. After the steel filler blocks 30 are transported to the installation box, they are pulled to the installation position and positioned and installed using the inclined web sliding system 20. This effectively utilizes the existing space within the box girder and installation box, saving manpower and machinery input, effectively ensuring construction reliability, and ensuring the rapid installation of steel structures weighing approximately 1 ton within a confined box. The construction efficiency is high, the alignment is precise, the personnel input is low, and the operational risk is low.

[0068] The embodiments of the present invention are not limited thereto. Based on the above embodiments of the present invention, using conventional technical knowledge and common means in the art, without departing from the basic technical idea of ​​the present invention and without conflict, the above preferred embodiments can be modified, replaced or combined in various other forms. All other embodiments obtained fall within the protection scope of the present invention.

Claims

1. A scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge, characterized in that... Includes the following steps: Step 1: Transporting steel filler blocks; First, a box girder sliding system is installed inside the box girder. Then, steel filler blocks are placed on the box girder sliding system. The box girder sliding system can slide longitudinally and laterally. When moving within the same box girder, the box girder sliding system drives the steel filler blocks to move longitudinally. When moving between two adjacent box girders, the box girder sliding system drives the steel filler blocks to move laterally through the manhole. Through longitudinal and lateral conversion, the box girder sliding system finally transports the steel filler blocks to the installation box. Step two, steel filler block installation; After the steel filler blocks are transported to the installation box via the box girder sliding system, the inclined web sliding system is installed in the installation box, and the inclined web installation ladder is used to install the steel filler blocks. 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 the installation position along the inclined web for installation. The operating ladder facilitates the work of the installation personnel.

2. The method for constructing a reinforced concrete bridge widening and reconstruction without scaffolding according to claim 1, characterized in that: The box girder sliding system includes a longitudinal sliding mechanism and a transverse sliding mechanism. The longitudinal sliding mechanism is installed inside the longitudinal box girder and drives the steel filler blocks to move along the longitudinal box girder. The transverse sliding mechanism is installed inside the adjacent transverse box girder and drives the steel filler blocks to move along the transverse box girder.

3. The method for constructing a reinforced concrete bridge widening and reconstruction without scaffolding according to claim 2, characterized in that: The longitudinal sliding mechanism includes a longitudinal trolley, a longitudinal track, a longitudinal pad beam, and a longitudinal pad block. The longitudinal pad beam is mounted on the longitudinal pad block, the longitudinal track is mounted on the longitudinal pad beam, and the longitudinal trolley is mounted on the longitudinal track and moves along the longitudinal track.

4. The scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 3, characterized in that: The lateral sliding mechanism includes a lateral trolley, a lateral track, a lateral support beam, and a lateral support block. The lateral support beam is mounted on the lateral support block, and the lateral track is mounted on the lateral support beam. The height difference between the lateral track and the longitudinal track is the height of either the longitudinal or lateral trolley. The lateral trolley moves along the lateral track.

5. The scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 4, characterized in that... The detailed steps for step one are as follows: (1) First, install longitudinal pads inside the longitudinal box girder, install longitudinal pad beams on the longitudinal pads, install longitudinal moving rails on the longitudinal pad beams, and install the longitudinal moving trolley on the longitudinal moving rails. (2) Then install transverse pads inside the transverse box girder, install transverse pad beams on the transverse pads, and install transverse tracks on the transverse pad beams. The height of the transverse tracks is higher than the height of the longitudinal tracks by one longitudinal trolley. At this time, the longitudinal trolley and the transverse tracks are at the same level. (3) The transverse trolley stops on the longitudinal trolley, the steel filler block is installed on the transverse trolley, the longitudinal trolley drives the transverse trolley and the steel filler block to move along the longitudinal track, and stops when it moves to the manhole of the longitudinal box girder. At this time, the transverse trolley can move to the transverse track, and the transverse trolley drives the steel filler block to move along the transverse track, thereby transporting the steel filler block to the installation box.

6. The scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 1, characterized in that: The inclined web sliding system includes a slide rail, a sliding plate, a sliding trolley, a traction unit, a lateral adjustment unit, and a vertical adjustment unit. The slide rail is installed in a mounting box. The sliding trolley is slidably mounted on the slide rail via the sliding plate. The steel filler block is mounted 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 filler block. The vertical adjustment unit is mounted on the sliding trolley and is used to adjust the installation angle of the steel filler block.

7. The method for constructing a widened and reconstructed old bridge using reinforced concrete without scaffolding, as described in claim 6, is characterized in that... The detailed steps for step two are as follows: (1) First, use the inclined web plate to install the inclined slide in the installation box, and construct the steel filler block according to the actual hole spacing on site, and drill anchor holes on the steel filler block. (2) Install the sliding trolley and the slide plate onto the slideway, then install the steel filler block with the drilled anchor holes onto the sliding trolley, and fix the steel filler block through the positioning unit; (3) Lift the steel block by the vertical adjustment unit on the sliding trolley so that the bottom of the steel block is suspended. Install the traction unit and move the sliding trolley along the slide rail by the traction unit. The sliding trolley drives the steel block to slide along the slide rail to the design position. (4) The slide plate is adjusted laterally by the lateral adjustment unit. The slide plate moves the steel filler block to the appropriate position. Then the tilt 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 bolts to fix the steel filler blocks, remove the inclined web sliding system, pour in epoxy mortar, and complete the installation of the steel filler blocks.

8. The scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 6, characterized in that: The traction unit uses a longitudinal guide chain to move the slide along the track.

9. A scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 6, characterized in that: The lateral adjustment unit uses a lateral guide chain to achieve lateral adjustment of the skateboard.

10. A scaffold-free construction method for widening and reconstructing an old reinforced concrete bridge according to claim 6, characterized in that: The vertical adjustment unit includes a threaded sleeve and a threaded rod. The threaded rod is installed inside the threaded sleeve and can move up and down along the threaded sleeve. The top of the threaded rod is connected to the steel filler block, and the angle of the steel filler block is adjusted by raising and lowering the threaded rod.

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