A curved side cast-in-place beam formwork assembly

Abstract

The utility model provides a kind of arc side cast-in-place beam formwork assembly, comprising: bottom template, two inner templates, intermediate mould, two arc modules, rectangular cushion block and triangular cushion block;Two The inner templates are respectively arranged in the left and right sides of the bottom template;The intermediate mould is arranged between the bottom template and two The inner templates;Two The arc modules are arranged between the bottom template and two The inner templates;The rectangular cushion block is arranged between the bottom template and the arc module;The triangular cushion block is arranged between the bottom template and the inner template.The utility model provides a kind of arc side cast-in-place beam formwork assembly, the arc consistency of arc module makes that the forming error of circular arc section is reduced compared with traditional " with straight instead of curve " process;The splicing of arc module and inner template, bottom template, cooperate with sealant strip, and leakage amount is reduced, and the incidence of concrete surface honeycomb pitted surface is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cast-in-place box girder construction, and in particular to a formwork assembly for cast-in-place beams with curved sides. Background Technology

[0002] In the field of cast-in-place beam construction, when there is a rounded transition structure on the side of the beam, traditional formwork technology faces significant technical bottlenecks.

[0003] In existing technologies, for cast-in-place beams with varying turning radii and beam heights, the conventional approach is to use wooden formwork in conjunction with scaffolding, but this method has the following problems:

[0004] Dimensional deviations and linear defects: If the distribution beam manufacturing process of "using straight lines instead of curves" is adopted for the arc transition section where the bottom plate, web plate and flange plate intersect, the dimensions of the arc section of the cast beam will locally exceed the limit, the appearance and linearity will be unsightly, and it will be difficult to meet the design accuracy requirements.

[0005] Forming difficulties and grout leakage: When the formwork for the base plate and web plate is set separately, it is difficult to form the arc section of the formwork accurately, and grout leakage is easy at the joints, resulting in quality defects such as honeycomb and pitting on the concrete surface, which increases the cost of later repairs.

[0006] Low formwork turnover efficiency: Traditional processes have poor adaptability to different turning radii, requiring frequent formwork modifications and resulting in low turnover utilization. This is especially true in the construction of cast-in-place beams with multiple spans and varying radii, where material waste and construction delays are prominent issues.

[0007] Therefore, it is necessary to provide a formwork assembly for cast-in-place beams with curved sides to solve the above-mentioned technical problems. Utility Model Content

[0008] This utility model provides a cast-in-place beam formwork assembly with an arc-shaped side, which solves the following technical problems of traditional formwork technology in cast-in-place beam construction: the use of "straight instead of curved" process to make arc transition section distribution beams results in the arc section of the beam having excessive dimensions and an unsightly shape, failing to meet design accuracy; when the bottom plate and web plate formwork are set separately, the arc section formwork is difficult to form and the joints are prone to grout leakage, causing defects in the concrete surface quality and increasing repair costs; the formwork has poor adaptability to different turning radii, requiring frequent modifications, resulting in low turnover rate, and easily causing material waste and construction delays in multi-span and variable radius construction.

[0009] To solve the above-mentioned technical problems, this utility model provides a cast-in-place formwork assembly for an arc-shaped side beam, comprising:

[0010] Bottom template, two inner templates, two outer templates, multiple support pads, intermediate mold, two arc modules, rectangular pads and triangular pads;

[0011] The two inner templates and the two outer templates are connected by a plurality of support pads;

[0012] The intermediate mold is disposed between the bottom mold and the two inner molds;

[0013] The two arc-shaped modules are disposed between the bottom template and the two inner templates;

[0014] The rectangular pad is disposed between the bottom template and the arc-shaped module;

[0015] The triangular pad is disposed between the bottom template and the inner template.

[0016] Preferably, the arc-shaped module is used for the transition connection between the inner template and the bottom template.

[0017] Preferably, the rectangular pad is used for connection and support between the bottom template and the arc-shaped module.

[0018] Preferably, the triangular pad is used for support and limiting between the bottom template and the inner template.

[0019] Preferably, a splicing assembly is provided between the bottom template, the inner template, and the arc-shaped module. The splicing assembly includes two L-shaped support blocks, multiple bolts, and support blocks. The two L-shaped support blocks are respectively disposed between the bottom template, the inner template, and the arc-shaped module, and the multiple bolts are respectively disposed between the two L-shaped support blocks.

[0020] Preferably, the L-shaped support block and the plurality of bolts are used for the connection between the bottom template, the inner template and the arc-shaped module.

[0021] Preferably, the support block is disposed between the bottom template and the arc-shaped module.

[0022] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0023] This utility model provides a cast-in-place beam template assembly with an arc-shaped side. The consistent curvature of the arc module reduces the forming error of the arc segment compared to the traditional "straight instead of curved" process.

[0024] The splicing of the arc-shaped module with the inner and bottom formwork, in conjunction with the use of sealing strips, reduces grout leakage and lowers the incidence of honeycomb and pitted surfaces on the concrete. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of a first embodiment of a cast-in-place beam formwork assembly with an arc-shaped side provided by this utility model;

[0026] Figure 2 for Figure 1 The enlarged schematic diagram of part A shown below;

[0027] Figure 3 A schematic diagram of the structure of a second embodiment of a cast-in-place beam formwork assembly with an arc-shaped side provided by this utility model;

[0028] Figure 4 A structural schematic diagram of a third embodiment of a cast-in-place beam formwork assembly with an arc-shaped side provided by this utility model;

[0029] Figure 5 A structural schematic diagram of the fourth embodiment of the arc-shaped side cast-in-place beam formwork assembly provided by this utility model;

[0030] Figure 6 A structural schematic diagram of the fifth embodiment of the arc-shaped side cast-in-place beam formwork assembly provided by this utility model;

[0031] Figure 7 for Figure 6 The enlarged schematic diagram of section B is shown below;

[0032] Figure 8 for Figure 6 The diagram shows the structure of the snap-fit ​​assembly and the telescopic assembly.

[0033] Figure 9 for Figure 6 The diagram shows the structure of the adjustable telescopic rod.

[0034] Figure 10 for Figure 9 The enlarged schematic diagram of section C is shown.

[0035] The diagram labels are: 1. Bottom template; 2. Inner template; 3. Intermediate mold; 4. Arc-shaped module; 5. Rectangular pad; 6. Triangular pad;

[0036] 7. Splicing components; 71. L-shaped support block; 72. Bolt; 73. Support block;

[0037] 8. Outer formwork; 9. Support pads;

[0038] 10. Support and limiting assembly; 101. Base plate; 102. Circular support rod; 103. Cross support rod; 104. Angled support rod; 105. Rectangular mounting block;

[0039] 11. Lifting assembly; 111. Support plate; 112. Support bracket; 113. Fixing bolt; 114. Circular support rod;

[0040] 12. Telescopic assembly; 121. Limiting component; 1211. U-shaped mounting base; 1212. U-shaped adjusting block; 1213. Sliding block; 1214. Sliding groove; 1215. Arc-shaped rubber ring; 1216. Threaded connecting bolt; 122. Adjustable telescopic rod;

[0041] 13. Snap-fit ​​assembly; 131. Fixing sleeve; 132. Circular limiting block; 133. U-shaped fixing block; 134. Snap-fit ​​component;

[0042] 14. Extruded parts. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] First Embodiment

[0045] Please refer to the following: Figure 1 and Figure 2 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of a cast-in-place beam formwork assembly with an arc-shaped side provided by this utility model; Figure 2 for Figure 1 The enlarged schematic diagram of part A is shown.

[0046] A formwork assembly for a cast-in-place beam with curved sides, comprising:

[0047] 1. Bottom template; 2. Two inner templates; 8. Two outer templates; 9. Multiple support pads; 3. Middle mold; 4. Two arc-shaped modules; 5. Rectangular pads; and 6. Triangular pads.

[0048] The two inner templates 2 and the two outer templates 8 are connected by a plurality of support pads 9;

[0049] The intermediate mold 3 is disposed between the bottom mold 1 and the two inner molds 2;

[0050] The two arc-shaped modules 4 are disposed between the bottom template 1 and the two inner templates 2;

[0051] The rectangular pad 5 is disposed between the bottom template 1 and the arc-shaped module 4;

[0052] The triangular pad 6 is disposed between the bottom template 1 and the inner template 2.

[0053] The arc-shaped module 4 is an arc-shaped segment cut axially from a PVC pipe, serving as a circular arc transition template at the intersection of the bottom template 1 and the inner template 2, with its curvature consistent with the designed arc radius.

[0054] The arc-shaped module 4 is used for the transition connection between the inner template 2 and the bottom template 1.

[0055] The rectangular pad 5 is used for connection and support between the bottom template 1 and the arc-shaped module 4.

[0056] The triangular pad 6 is used for support and limiting between the bottom template 1 and the inner template 2.

[0057] The bottom formwork 1 serves as the forming carrier for the bottom slab of the beam, while the inner formwork 2 is the forming template for the web slab. It is set perpendicular to the bottom formwork 1 and together they form the side profile of the beam.

[0058] The inner template 2 is connected to the bottom template 1 by a triangular pad 6. The triangular pad 6 is welded to the edge of the bottom template 1, and the bottom of the inner template 2 abuts against the inclined surface of the triangular pad 6 and is fixed by nails.

[0059] The inner side of the arc-shaped module 4 is connected to the bottom template 1 through a rectangular pad 5, which is fixed to the bottom template 1 with nails, and at the same time supports the arc-shaped module 4 to prevent it from sagging.

[0060] The outer side of the arc-shaped module 4 is aligned with the edge of the inner template 2 and fixed by nailing with the back rib timber to form a smooth transition.

[0061] The intermediate mold 3 is a detachable frame structure, placed between the bottom mold 1 and the inner mold 2, to support the internal space of the beam, ensure the accuracy of the beam height, and prevent the mold from shrinking during concrete pouring.

[0062] The intermediate mold 3 is connected to the inner side of the inner template 2 through the top support, with the top abutting against the inner template 2 and the bottom fixed to the bottom template 1, forming a rigid support system.

[0063] During construction, the bottom formwork 1 is first installed and leveled. Then, the inner formwork 2 is positioned with the bottom formwork 1 using triangular pads 6. Subsequently, an arc-shaped module 4 is embedded at the arc transition between the bottom formwork 1 and the inner formwork 2. The arc-shaped module 4 is supported by rectangular pads 5 to form a complete formwork system. When the concrete is poured, the formwork system resists lateral pressure through a rigid support structure to ensure the accuracy of the arc segment line.

[0064] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0065] This utility model provides a cast-in-place beam template assembly with an arc-shaped side. The consistent curvature of the arc module 4 reduces the forming error of the arc segment compared to the traditional "straight instead of curved" process.

[0066] The splicing of the arc-shaped module 4 with the inner template 2 and the bottom template 1, in conjunction with the use of sealing strips, reduces grout leakage and lowers the incidence of honeycomb and pitted surfaces on the concrete.

[0067] Second Embodiment

[0068] Please refer to the following: Figure 3Based on the first embodiment of this application which provides a cast-in-place formwork assembly for an arc-shaped side beam, the second embodiment of this application proposes another cast-in-place formwork assembly for an arc-shaped side beam. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0069] Specifically, the second embodiment of this application provides a formwork assembly for a cast-in-place curved side beam, which differs in that it further includes a splicing assembly 7. The splicing assembly 7 is disposed between the bottom formwork 1, the inner formwork 2, and the curved module 4. The splicing assembly 7 includes two L-shaped support blocks 71, multiple bolts 72, and support blocks 73. The two L-shaped support blocks 71 are respectively disposed between the bottom formwork 1, the inner formwork 2, and the curved module 4, and the multiple bolts 72 are respectively disposed between the two L-shaped support blocks 71.

[0070] The L-shaped support block 71 and the plurality of bolts 72 are used for the connection between the bottom template 1, the inner template 2 and the arc-shaped module 4.

[0071] The support block 73 is disposed between the bottom template 1 and the arc-shaped module 4.

[0072] L-shaped support blocks 71 are respectively attached to both sides of the joint between the bottom template 1 and the inner template 2, and between the bottom template 1 and the arc-shaped module 4, forming an "L"-shaped clamping structure to enhance the deformation resistance at the joint.

[0073] The horizontal section of the L-shaped support block 71 is fixed to the bottom template 1 by expansion bolts, and the vertical section is attached to the surface of the inner template 2 or the arc module 4. The bolts 72 are used to pull and tighten the L-shaped support block 71 on the other side to ensure a tight joint.

[0074] Bolt 72 is equipped with a spring washer to prevent it from loosening due to vibration.

[0075] The top of the support block 73 rests against the inner side of the arc-shaped module 4, and the bottom is fixed to the bottom template 1 with nails, forming a double support with the rectangular pad block 5 to improve the stability of the arc segment.

[0076] The working principle of the arc-shaped side cast-in-place beam formwork assembly provided by this utility model is as follows:

[0077] When installing the bottom template 1, the two inner templates 2, and the two arc-shaped modules 4, first place the arc-shaped modules 4 between the bottom template 1 and the inner templates 2 and adjust their positions. Then, place the two L-shaped support blocks 71 into contact with the connection points between the bottom template 1 and the arc-shaped modules 4, and between the inner templates 2 and the arc-shaped modules 4, respectively. Then, use multiple bolts 72 to pass through the L-shaped support blocks 71 and thread them into the bottom template 1, the inner templates 2, and the arc-shaped modules 4. After fixing the bottom template 1, the inner templates 2, and the arc-shaped modules 4, connect the support blocks 73 between the bottom template 1 and the arc-shaped modules 4 by plugging and unplugging.

[0078] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0079] This utility model provides a cast-in-place beam formwork assembly with an arc-shaped side. Two sets of two L-shaped support blocks 71, multiple bolts 72 and support blocks 73 are set between the bottom formwork 1, two inner formworks 2 and two arc-shaped modules 4, which can facilitate the convenient splicing and fixing of the three together.

[0080] Third Embodiment

[0081] Please refer to the following: Figure 4 Based on the first embodiment of this application which provides a cast-in-place beam formwork assembly with curved sides, the third embodiment of this application proposes another cast-in-place beam formwork assembly with curved sides. The third embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the third embodiment will not affect the separate implementation of the first embodiment.

[0082] Specifically, the third embodiment of this application provides a different type of cast-in-place beam formwork assembly with an arc-shaped side, which further includes a support and limiting assembly 10. The support and limiting assembly 10 is disposed at the bottom of the bottom formwork 1. The support and limiting assembly 10 includes a base plate 101, two circular support rods 102, two cross support rods 103, two diagonal support rods 104, and two rectangular mounting blocks 105. The two circular support rods 102, the two cross support rods 103, and the two diagonal support rods 104 are symmetrically installed on the surface of the base plate 101, and the two rectangular mounting blocks 105 are respectively installed at both ends of the base plate 101.

[0083] The use of cross support rod 103 and diagonal support rod 104 can support the entire device in multiple directions. A circular through hole is provided on the surface of the rectangular mounting block 105 to facilitate the fixing of the entire device by passing a threaded bolt through the rectangular mounting block 105.

[0084] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0085] This utility model provides a cast-in-place beam formwork assembly with an arc-shaped side. The bottom formwork 1 has a base plate 101, two circular support rods 102, two cross support rods 103 and two diagonal support rods 104 on its surface to facilitate support of the entire device from multiple directions inward, thereby increasing the stability of the entire device.

[0086] Fourth embodiment

[0087] Please refer to the following: Figure 5 Based on the first embodiment of this application which provides a cast-in-place beam formwork assembly with curved sides, the fourth embodiment of this application proposes another cast-in-place beam formwork assembly with curved sides. The fourth embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the fourth embodiment will not affect the separate implementation of the first embodiment.

[0088] Specifically, the fourth embodiment of this application provides a different type of cast-in-place beam formwork assembly with an arc-shaped side, which further includes a support assembly 11. The support assembly 11 is disposed between the bottom formwork 1, the outer formwork 8, and the base plate 101. The support assembly 11 includes a support plate 111, a support bracket 112, two fixing bolts 113, and a circular support rod 114. The support plate 111 is disposed on the side of the outer formwork 8. The support bracket 112 is installed between the support plate 111 and the bottom formwork 1 through the two fixing bolts 113. The circular support rod 114 is connected between the support plate 111 and the base plate 101.

[0089] The support bracket 112 is installed obliquely between the bottom template 1 and the support plate 111. Fixing holes adapted to two fixing bolts 113 are opened between the bottom template 1 and the support bracket 112. The use of the circular support rod 114 can provide secondary support for the support plate 111.

[0090] In use, first place the support plate 111 on the surface of the outer template 8, then place the support bracket 112 between the support plate 111 and the bottom template 1, then use two fixing bolts 112 to fix the support bracket 112 and the bottom template 1 and the support bracket 112, support plate 111 and outer template 8 respectively, and finally weld the circular support plate 114 between the bottom plate 101 and the support plate 111.

[0091] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0092] This utility model provides a cast-in-place beam formwork assembly with an arc-shaped side. A support plate 111, a support bracket 112, two fixing bolts 113 and a circular support rod 114 are set between the bottom formwork 1, the outer formwork 8 and the bottom plate 101. The assembly can provide external support for the outer formwork 8 when concrete is poured between the outer formwork 8 and the intermediate mold 3.

[0093] Fifth embodiment

[0094] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 Based on the first embodiment of this application which provides a cast-in-place beam formwork assembly with curved sides, the fifth embodiment of this application proposes another cast-in-place beam formwork assembly with curved sides. The fifth embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the fifth embodiment will not affect the separate implementation of the first embodiment.

[0095] Specifically, the fifth embodiment of this application provides a formwork assembly for a cast-in-place beam with an arc-shaped side, which differs in that it also includes multiple telescopic components 12. The multiple telescopic components 12 are all disposed between the base plate 101 and the multiple circular support rods 102. Each telescopic component 12 includes a limiting member 121 and two adjusting telescopic rods 122, and the two adjusting telescopic rods 122 are respectively connected to the two ends of the limiting member 121.

[0096] A snap-fit ​​assembly 13 is provided between the adjusting telescopic rod 122 and the circular support rod 102. The snap-fit ​​assembly 13 includes a fixing sleeve 131, a circular limiting block 132, a U-shaped fixing block 133, and a snap-fit ​​member 134. The fixing sleeve 131 is fitted onto the surface of the circular support rod 102, the circular limiting block 132 is fitted onto the surface of the fixing sleeve 131, the U-shaped fixing block 133 is fitted onto the surface of the circular limiting block 132, and the snap-fit ​​member 134 is disposed between the U-shaped fixing block 133 and the circular limiting block 132.

[0097] The limiting component 121 includes a U-shaped mounting base 1211, a U-shaped adjusting block 1212, two sliding blocks 1213, two sliding grooves 1214, two arc-shaped rubber rings 1215, and two threaded connecting bolts 1216. The U-shaped adjusting block 1212 is disposed inside the U-shaped mounting base 1211. The two sliding blocks 1213 are respectively connected to both sides of the U-shaped adjusting block 1212. The two sliding grooves 1214 are respectively opened on both sides of the inner wall of the U-shaped mounting base 1211. The two arc-shaped rubber rings 1215 are respectively bonded to the inner walls of the U-shaped mounting base 1211 and the U-shaped adjusting block 1212. The two threaded connecting bolts 1216 are respectively disposed between the U-shaped mounting base 1211 and the two sliding blocks 1213.

[0098] In use, first, the U-shaped mounting base 1211 is fitted onto the surface of the cross support rod 103. Then, the U-shaped adjusting block 1212 with two sliding blocks 1213 is installed inside the U-shaped mounting base 1211. At the same time, the two sliding blocks 1213 are connected to the two sides of the inner wall of the U-shaped adjusting block 1212, and the U-shaped mounting base 1211 and the U-shaped adjusting block 1212 are connected. Then, the threaded bolt 1216 is passed through the U-shaped mounting base 1211 and connected to the sliding block 1213.

[0099] An opening is provided on one side of the sliding groove 1214 to facilitate the installation of the sliding block 1213, and at the same time, the distance between the U-shaped mounting base 1211 and the U-shaped adjusting block 1212 can be adjusted.

[0100] The surface of the adjusting telescopic rod 122 is provided with a pressing element 14.

[0101] The extrusion member 14 consists of a fixed connecting ring and an extrusion bolt, and multiple limiting through holes are provided on the inner wall of the adjusting telescopic rod 122.

[0102] The size of the adjustable telescopic rod 122 can be adjusted according to the installation position. The U-shaped fixing block 133 is connected to one end of the adjustable telescopic rod 122. The snap-fit ​​part 134 is composed of bolts and threaded sleeves. Multiple snap-fit ​​holes that are compatible with the snap-fit ​​part 134 are opened on the surface of the circular limit block 132. Snap-fit ​​through holes are opened on the U-shaped fixing block 133.

[0103] In use, when fixing multiple circular support rods 102 together, first place the adjusting telescopic rod 122 with U-shaped fixing block 133 between the multiple circular support rods 102, then pull the adjusting telescopic rod 122 to drive the U-shaped fixing block 133 to be sleeved on the surface of the circular limit block 132, and finally use the snap fastener 134 to connect the U-shaped fixing block 133 and the circular limit block 132.

[0104] Compared with related technologies, the arc-shaped side cast-in-place beam formwork assembly provided by this utility model has the following beneficial effects:

[0105] This utility model provides a cast-in-place beam formwork assembly with an arc-shaped side, wherein a telescopic assembly 12 and a snap-fit ​​assembly 13 are provided between multiple circular support rods 102 to increase the stability of the entire device during casting.

[0106] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A formwork assembly for a cast-in-place beam with an arc-shaped side, characterized in that, include: Bottom template, two inner templates, two outer templates, multiple support pads, intermediate mold, two arc modules, rectangular pads and triangular pads; The two inner templates and the two outer templates are connected by a plurality of support pads; The intermediate mold is disposed between the bottom template and the two inner templates; The two arc-shaped modules are disposed between the bottom template and the two inner templates; The rectangular pad is disposed between the bottom template and the arc-shaped module; The triangular pad is disposed between the bottom template and the inner template; The arc-shaped module is used for the transition connection between the inner template and the bottom template; The rectangular pad is used for connection and support between the bottom template and the arc-shaped module; The triangular pad is used for support and limiting between the bottom template and the inner template; A splicing assembly is provided between the bottom template, the inner template, and the arc-shaped module. The splicing assembly includes two L-shaped support blocks, multiple bolts, and support blocks. The two L-shaped support blocks are respectively disposed between the bottom template, the inner template, and the arc-shaped module, and the multiple bolts are respectively disposed between the two L-shaped support blocks. The L-shaped support block and the plurality of bolts are used for the connection between the bottom template, the inner template and the arc-shaped module; The support block is disposed between the bottom template and the arc-shaped module; The L-shaped support blocks are respectively attached to both sides of the joint between the bottom template and the inner template, and between the bottom template and the arc module, forming an "L" shaped clamping structure to enhance the deformation resistance at the joint. The horizontal section of the L-shaped support block is fixed to the bottom template by expansion bolts, and the vertical section is attached to the surface of the inner template or the arc module. The bolts are used to pull and tighten the L-shaped support block on the other side to ensure a tight joint. The bolts are fitted with spring washers to prevent them from loosening due to vibration; The top of the support block abuts against the inner side of the arc-shaped module, and the bottom is fixed to the bottom template with nails, forming a double support with the rectangular pad block to improve the stability of the arc segment.

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