Brickwork structure concrete horizontal straining beam formwork erecting and fixing device
By combining the template baffle device and the rectangular tube connecting plate device, the problem of fixing the horizontal tie beam template without damaging the appearance of the masonry structure is solved, and a stable connection and multiple reuses are achieved. It is suitable for the support of horizontal tie beam templates for walls with a thickness of 100mm to 500mm.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-03-20
AI Technical Summary
In construction engineering, existing technology cannot effectively fix horizontal tie beam formwork without damaging the appearance of the masonry structure, especially when the wall height exceeds 4m. Horizontal tie beam formwork needs to be set on the wall, but opening holes or reserving bolt holes is not allowed.
The template baffle device and rectangular tube connecting plate device are adopted. The template is stably connected by using the limiting baffle, rectangular connecting plate and rectangular tube connecting plate made of aluminum alloy material, and irregular bolt holes and connecting bolts to avoid drilling holes in the wall.
It achieves a stable connection of horizontal tie beam formwork, ensures the appearance quality of masonry structures, has a wide range of applications, low maintenance costs, and can be reused multiple times.
Smart Images

Figure CN224016772U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of building engineering masonry structure construction technology, especially to a kind of masonry structure concrete horizontal tie beam formwork support fixed device. BACKGROUND
[0002] At present, in the construction process of building engineering masonry structure, when the wall height of masonry infill wall exceeds 4m, it is appropriate to set a cast-in-place reinforced concrete horizontal tie beam connected with the column at half the height of the wall and penetrating along the whole length of the wall. The horizontal tie beam is a cast-in-place concrete structure, which is generally divided into plate strips and ring beams. Formwork needs to be erected on both sides of the wall at the horizontal tie beam, and the beam formwork needs to be fixed on the wall to ensure the molding effect of the beam concrete. In order to ensure the appearance of the concrete after pouring the horizontal tie beam and the visual perception of the masonry, it is not allowed to open holes or reserve holes on the masonry structure wall after pouring. The horizontal tie beam formwork support system needs to be self-contained and cannot be fixed on the wall. In view of the above situation, the requirements for masonry and visual quality of masonry structure are becoming higher and higher in current building engineering. There are many horizontal tie beams in large-space residences, factories and public buildings. The pouring quality and fixing method of the horizontal tie beam have a great impact on the overall appearance quality of the masonry. It is necessary to solve the problems of not opening holes or reserving bolt holes on the outer wall after fixing the horizontal tie beam, and the horizontal tie beam formwork support and fixing device need to use new measures to solve the problems. SUMMARY
[0003] The utility model aims at solving the deficiency of prior art, and provides a kind of masonry structure concrete horizontal tie beam formwork support fixed device.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a kind of masonry structure concrete horizontal tie beam formwork support fixed device, comprising: two groups of formwork baffle device, two groups of rectangular tube connecting plate device, two rectangular tube connecting plate special connecting bolts, four rectangular connecting plate special connecting bolts;
[0005] The formwork baffle device comprises: a limiting baffle, which is composed of a rectangle and a triangle, a rectangular lower connecting plate is fixedly connected to the top of the limiting baffle, two lower connecting plate special-shaped bolt holes are formed in the middle of the rectangular lower connecting plate, the shape of the lower connecting plate special-shaped bolt hole is a cross of coaxial circle and ellipse, a lower solid knock-off hammer ear is fixedly installed on the inclined edge of the limiting baffle, an upper solid knock-off hammer ear is fixedly installed on the side edge of the rectangular lower connecting plate, and the upper solid knock-off hammer ear and the lower solid knock-off hammer ear are located on the same side.
[0006] The rectangular lower connecting plate and the rectangular upper connecting plate are connected through a rectangular connecting plate special connecting bolt.
[0007] Two groups of the rectangular tube connecting plate devices are connected through two rectangular tube connecting plate special connecting bolts.
[0008] The rectangular lower connecting plate and the rectangular upper connecting plate are connected through a rectangular connecting plate special connecting bolt.
[0009] Further, the rectangular tube connecting plate special connecting bolt includes a rectangular tube connecting plate special hexagonal nut, a rectangular tube connecting plate special circular screw rod, and a rectangular tube connecting plate special special-shaped screw rod, which are sequentially fixedly connected, the shape of the rectangular tube connecting plate special special-shaped screw rod is consistent with that of the rectangular tube connecting plate special special-shaped bolt hole, which is composed of coaxial circles and ellipses, the circular diameter of the rectangular tube connecting plate special circular screw rod is consistent with that of the rectangular tube connecting plate special special-shaped screw rod, and the centers of the circles are coaxial, and the rectangular tube connecting plate special circular screw rod is arranged in the rectangular tube connecting plate special special-shaped bolt hole.
[0010] Further, the rectangular connecting plate special connecting bolt includes a rectangular connecting plate special hexagonal nut, a rectangular connecting plate special special-shaped screw rod, and a rectangular connecting plate special circular screw rod with a wire, which are sequentially fixedly connected, the shape of the rectangular connecting plate special special-shaped screw rod is consistent with that of the upper connecting plate special special-shaped bolt hole and the lower connecting plate special special-shaped bolt hole, which is composed of coaxial circles and ellipses, the rectangular connecting plate special special-shaped screw rod is arranged in the upper connecting plate special special-shaped bolt hole and the lower connecting plate special special-shaped bolt hole, and a gasket, a spring washer, and a nut are sequentially arranged on the rectangular connecting plate special circular screw rod with a wire.
[0011] Further, the limiting baffle, the rectangular lower connecting plate, the lower solid installation and dismounting hammer ear, the upper solid installation and dismounting hammer ear, the rectangular upper connecting plate, and the rectangular tube connecting plate are all made of aluminum alloy materials.
[0012] Further, the rectangular tube connecting plate special connecting bolt and the rectangular connecting plate special connecting bolt are both made of aluminum alloy materials, and the nut, the spring washer, and the gasket are all made of iron materials.
[0013] Further, the total thickness of the limiting baffle is 20mm, the wall thickness is 3mm, the total width is 50mm, and the total height is 150mm, the total thickness of the rectangular lower connecting plate is 20mm, the wall thickness is 5mm, the height is 20mm, and the width is 50mm, the total thickness of the rectangular upper connecting plate is 20mm, the wall thickness is 5mm, the height is 20mm, and the width is 50mm, the total thickness of the rectangular pipe connecting plate is 20mm, the wall thickness is 3mm, the height is 30mm, and the width is 350mm, and the distance between the special-shaped bolt holes of the rectangular pipe connecting plate is 10mm.
[0014] Further, the diameter of the special hexagonal nut for the rectangular pipe connecting plate is 20mm, and the thickness is 10mm, the diameter of the special circular screw rod for the rectangular pipe connecting plate is 6mm, and the length is 43mm, and the length of the special-shaped screw rod for the rectangular pipe connecting plate is 10mm.
[0015] Further, the diameter of the special hexagonal nut for the rectangular pipe connecting plate is 20mm, and the thickness is 10mm, the diameter of the special circular screw rod for the rectangular pipe connecting plate is 6mm, and the length is 43mm, and the length of the special-shaped screw rod for the rectangular pipe connecting plate is 10mm.
[0016] The beneficial effects of the utility model are: the template baffle device, the rectangular pipe connecting plate device, the special connecting bolt for the rectangular pipe connecting plate and the special connecting bolt for the rectangular connecting plate can be batch processed in a processing factory, and the quality of finished products is easy to guarantee. The material quality is aluminum alloy, which is fatigue-resistant, high-strength, light in weight and not easy to damage. The rectangular pipe connecting plate device and the template baffle device are connected stably by the special connecting bolt for the rectangular pipe connecting plate and the special connecting bolt for the rectangular connecting plate and are not easy to loosen. The device can be applied to horizontal beam template support of a wall body with a thickness of 100mm-500mm, and the application range is wide. If a component is damaged, the single component can be replaced after disassembly, the maintenance cost is low, and the device can be used repeatedly. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a structural schematic view of the utility model;
[0018] Figure 2 It is a structural schematic view of the template baffle device;
[0019] Figure 3 It is a structural schematic view of the rectangular pipe connecting plate device;
[0020] Figure 4 It is a structural schematic view of the special connecting bolt for the rectangular pipe connecting plate;
[0021] Figure 5 It is a structural schematic view of the special connecting bolt for the rectangular connecting plate;
[0022] Figure: 1 - template baffle device; 11 - limit baffle; 12 - rectangular lower connecting plate; 13 - lower connecting plate special bolt hole; 14 - lower solid installation and removal hammer ear; 15 - upper solid installation and removal hammer ear; 2 - rectangular tube connecting plate device; 21 - rectangular upper connecting plate; 22 - rectangular tube connecting plate; 23 - rectangular tube connecting plate special bolt hole; 24 - upper connecting plate special bolt hole; 3 - rectangular tube connecting plate special connecting bolt; 31 - rectangular tube connecting plate special hex nut; 32 - rectangular tube connecting plate special round screw; 33 - rectangular tube connecting plate special special screw; 4 - rectangular connecting plate special connecting bolt; 41 - rectangular connecting plate special hex nut; 42 - rectangular connecting plate special special screw; 43 - rectangular connecting plate special round screw with silk; 44 - nut; 45 - spring pad; 46 - pad plate;;
[0023] The drawings in the utility model are schematic diagrams, and the size does not represent the actual size;
[0024] The utility model will be described in detail below with reference to the drawings and embodiments of the utility model. PREFERRED EMBODIMENT
[0025] The utility model will be described in detail below with reference to the drawings and embodiments of the utility model.
[0026] As Figures 1-5 shown, a kind of masonry structure concrete horizontal beam formwork support fixed device, comprising: two groups of template baffle device 1, two groups of rectangular tube connecting plate device 2, two rectangular tube connecting plate special connecting bolt 3, four rectangular connecting plate special connecting bolt 4;
[0027] The template baffle device 1 includes: limit baffle 11, the limit baffle 11 is combined by rectangle and triangle, rectangular lower connecting plate 12 is fixedly connected at the top of the limit baffle 11, two lower connecting plate special bolt holes 13 are formed in the middle of the rectangular lower connecting plate 12, the shape of the lower connecting plate special bolt hole 13 is coaxial circular and oval intersection, lower solid installation and removal hammer ear 14 is fixedly installed on the inclined edge of the limit baffle 11, upper solid installation and removal hammer ear 15 is fixedly installed on the side of the rectangular lower connecting plate 12, the upper solid installation and removal hammer ear 15 is located on the same side with the lower solid installation and removal hammer ear 14;
[0028] Specifically, limit baffle 11 is used to limit horizontal beam formwork, and the vertical surface of limit baffle 11 can be fixed and can ensure that the formwork vertical surface is straight. Upper solid installation and removal hammer ear 15 and lower solid installation and removal hammer ear 14 can be knocked by hammer to install and remove template baffle device 1, which is simple and easy to operate.
[0029] The rectangular upper connecting plate 21 is fixedly connected with the rectangular pipe connecting plate 22 at the top, a row of pipe connecting plate special-shaped bolt holes 23 are arranged in the middle of the rectangular pipe connecting plate 22, the shape of the pipe connecting plate special-shaped bolt holes 23 is coaxial circular and elliptical intersection, two upper connecting plate special-shaped bolt holes 24 are arranged in the middle of the rectangular upper connecting plate 21, the shape of the upper connecting plate special-shaped bolt holes 24 is consistent with the shape of the lower connecting plate special-shaped bolt holes 13, that is, coaxial circular and elliptical intersection.
[0030] Specifically, the distance between the two template baffle devices 1 is changed by adjusting the overlapping length of the two pipe connecting plates 22 to adapt to the size of different wall thicknesses. The top of the pipe connecting plate 22 has a scale, which can be adjusted according to the scale.
[0031] The two groups of pipe connecting plate devices 2 are connected by two pipe connecting plate special connecting bolts 3.
[0032] The rectangular lower connecting plate 12 and the rectangular upper connecting plate 21 are connected by a rectangular connecting plate special connecting bolt 4.
[0033] The pipe connecting plate special connecting bolt 3 includes a pipe connecting plate special hexagonal nut 31, a pipe connecting plate special circular screw 32 and a pipe connecting plate special special-shaped screw 33, which are sequentially fixedly connected, the shape of the pipe connecting plate special special-shaped screw 33 is consistent with the shape of the pipe connecting plate special-shaped bolt hole 23, that is, coaxial circular and elliptical intersection, the circular diameter of the pipe connecting plate special circular screw 32 is consistent with the circular diameter of the pipe connecting plate special special-shaped screw 33 and the centers are coaxial, and the pipe connecting plate special circular screw 32 is arranged in the pipe connecting plate special-shaped bolt hole 23.
[0034] Specifically, one pipe connecting plate special connecting bolt 3 is inserted into a group of butt-jointed pipe connecting plate special-shaped bolt holes 23, the pipe connecting plate special connecting bolt 3 is rotated after being completely inserted into the hole, then another pipe connecting plate special connecting bolt 3 is inserted into another group of pipe connecting plate special-shaped bolt holes 23, and the distance between the pipe connecting plate special-shaped bolt holes 23 of the other group and the pipe connecting plate special connecting bolt 3 inserted into the first group is 3-5 hole positions. After the pipe connecting plate special connecting bolt 3 passes through the pipe connecting plate special-shaped bolt hole 23 and is rotated, the pipe connecting plate special special-shaped screw 33 at the end is not easy to fall out or be pulled out from the pipe connecting plate special-shaped bolt hole 23 without external force, because the diameter of the pipe connecting plate special special-shaped screw 33 is different from that of the circular hole after being rotated, thereby ensuring the stability of the connection between the two pipe connecting plates 22.
[0035] The special connecting bolt for the rectangular connecting plate 4 comprises a special hexagonal nut for the rectangular connecting plate 41, a special special-shaped screw rod for the rectangular connecting plate 42 and a special circular screw rod with a wire for the rectangular connecting plate 43, which are sequentially fixedly connected, the special-shaped screw rod for the rectangular connecting plate 42 is coaxial circular and elliptical in shape and is consistent with the upper connecting plate special-shaped bolt hole 24 and the lower connecting plate special-shaped bolt hole 13, the special-shaped screw rod for the rectangular connecting plate 42 is arranged in the upper connecting plate special-shaped bolt hole 24 and the lower connecting plate special-shaped bolt hole 13, and the special circular screw rod with a wire for the rectangular connecting plate 43 is sequentially sleeved with a gasket 46, a spring washer 45 and is screwed with a nut 44.
[0036] Specifically, after the special connecting bolt for the rectangular connecting plate passes through the lower connecting plate special-shaped bolt hole 13 and the upper connecting plate special-shaped bolt hole 24, the gasket 46 and the spring washer 45 are sequentially arranged in the special-shaped screw rod for the rectangular connecting plate, and then the nut 44 is screwed into the special circular screw rod with a wire for the rectangular connecting plate 43 until the nut 44 is tightened, so that the template baffle device 1 and the rectangular connecting plate device 2 are connected into a whole. Since the special-shaped screw rod in the middle is coaxial circular and elliptical, the nut 44 is not easy to loosen after being tightened, which ensures the stability of the connection between the template baffle device 1 and the rectangular connecting plate device 2.
[0037] The limiting baffle 11, the rectangular lower connecting plate 12, the lower solid installation and dismounting hammer ear 14, the upper solid installation and dismounting hammer ear 15, the rectangular upper connecting plate 21 and the rectangular connecting plate 22 are all made of aluminum alloy material.
[0038] The special connecting bolt for the rectangular connecting plate 4 and the special connecting bolt for the rectangular connecting plate 4 are all made of aluminum alloy material, and the nut 44, the spring washer 45 and the gasket 46 are all made of iron material.
[0039] The total thickness of the limiting baffle 11 is 20mm, the wall thickness is 3mm, the total width is 50mm and the total height is 150mm, the total thickness of the rectangular lower connecting plate 12 is 20mm, the wall thickness is 5mm, the height is 20mm and the width is 50mm, the total thickness of the rectangular upper connecting plate 21 is 20mm, the wall thickness is 5mm, the height is 20mm and the width is 50mm, the total thickness of the rectangular connecting plate 22 is 20mm, the wall thickness is 3mm, the height is 30mm and the width is 350mm, and the distance between the special-shaped bolt holes 23 of the rectangular connecting plate is 10mm.
[0040] The diameter of the hexagonal nut 31 special for the rectangular pipe connecting plate is 20mm, and the thickness is 10mm; the diameter of the circular screw 32 special for the rectangular pipe connecting plate is 6mm, and the length is 43mm; the length of the special-shaped screw 33 special for the rectangular pipe connecting plate is 10mm.
[0041] The diameter of the hexagonal nut 41 special for the rectangular connecting plate is 20mm, and the thickness is 10mm; the length of the special-shaped screw 42 special for the rectangular connecting plate is 40mm, the circular diameter is 8mm, and the height of the elliptical convex part is 4mm; the diameter of the circular screw with wire 43 special for the rectangular connecting plate is 8mm, and the length is 20mm.
[0042] The use method of the utility model is:
[0043] The interval between the formwork setting fixing devices is determined according to the construction scheme, and is marked on the masonry wall, or the position of the formwork setting fixing device at the starting point is determined, and then the positions of the formwork setting fixing devices at other positions are determined in sequence.
[0044] The two groups of formwork baffle devices 1 and the two groups of rectangular pipe connecting plate devices 2 are connected through the connecting bolts 4 special for the rectangular connecting plate, after the interval of the two formwork baffle devices 1 is determined, the overlap length of the two rectangular pipe connecting plates 22 is adjusted, the two groups of rectangular pipe connecting plate devices 2 connected with the formwork baffle devices 1 are butted front and back according to the position of the marked formwork setting fixing device, and when the butting is performed, the upper solid installation and dismounting hammer ears 15 and the lower solid installation and dismounting hammer ears 14 of the two formwork baffle devices 1 need to be outward.
[0045] The connected device is penetrated into the outside of the formwork from the upper opening of the formwork, and then the upper solid installation and dismounting hammer ears 15 of the two formwork baffle devices are knocked by a hammer from the upper to the lower, and when the knocking is performed, the upper solid installation and dismounting hammer ears 15 need to be alternately knocked front and back, so that the limiting baffles 11 on the two sides slowly move downwards, and the knocking is stopped when the distance between the rectangular pipe connecting plate 22 and the top of the formwork is 100mm.
[0046] After the horizontal beam concrete pouring is completed and the formwork removal condition is reached, the lower solid installation and dismounting hammer ears 14 of the two formwork baffle devices 1 are knocked by a hammer from the lower to the upper, so that the limiting baffles 11 on the two sides slowly move upwards, and when the knocking is performed, the lower solid installation and dismounting hammer ears 14 need to be alternately knocked front and back, and the knocking is stopped until the limiting baffles 11 completely separate from the formwork.
[0047] The utility model is described above in conjunction with the drawings, and obviously, the specific implementation of the utility model is not limited by the above mode, as long as various improvements are made by adopting the method concept and the technical scheme of the utility model, or the utility model is directly applied to other occasions without improvement, and all falls within the protection scope of the utility model.
Claims
1. A formwork support and fixing device for a horizontal tie beam in a masonry structure, characterized in that, include: Two sets of template baffle devices (1), two sets of rectangular tube connecting plate devices (2), two special connecting bolts for rectangular tube connecting plates (3), and four special connecting bolts for rectangular connecting plates (4); The template baffle device (1) includes: a limiting baffle (11), which is composed of a rectangle and a triangle. A rectangular lower connecting plate (12) is fixedly connected to the top of the limiting baffle (11). Two irregular bolt holes (13) are opened in the middle of the rectangular lower connecting plate (12). The irregular bolt holes (13) are composed of coaxial circles and ellipses. A lower solid installation hammer ear (14) is fixedly installed on the inclined side of the limiting baffle (11). An upper solid installation hammer ear (15) is fixedly installed on the side of the rectangular lower connecting plate (12). The upper solid installation hammer ear (15) and the lower solid installation hammer ear (14) are located on the same side. The rectangular tube connecting plate device (2) includes: a rectangular upper connecting plate (21), a rectangular tube connecting plate (22) fixedly connected to the top of the rectangular upper connecting plate (21), a row of rectangular tube connecting plate irregular bolt holes (23) is opened in the middle of the rectangular tube connecting plate (22), the shape of the rectangular tube connecting plate irregular bolt holes (23) is composed of coaxial circles and ellipses, and two upper connecting plate irregular bolt holes (24) are opened in the middle of the rectangular upper connecting plate (21), the shape of the upper connecting plate irregular bolt holes (24) is the same as that of the lower connecting plate irregular bolt holes (13), which are coaxial circles and ellipses. The two sets of rectangular tube connecting plate devices (2) are connected by two special connecting bolts (3) for the rectangular tube connecting plates; The lower rectangular connecting plate (12) and the upper rectangular connecting plate (21) are connected by special connecting bolts (4) for rectangular connecting plates.
2. The formwork support and fixing device for a horizontal tie beam in a masonry structure according to claim 1, characterized in that, The special connecting bolt (3) for rectangular tube connecting plates includes a special hexagonal nut (31), a special round screw (32), and a special irregular screw (33). The special hexagonal nut (31), the special round screw (32), and the special irregular screw (33) are fixedly connected in sequence. The shape of the special irregular screw (33) is consistent with the shape of the special irregular bolt hole (23) of the rectangular tube connecting plate, which is composed of a coaxial circle and an ellipse. The circular diameter of the special round screw (32) is consistent with the circular diameter of the special irregular screw (33) of the rectangular tube connecting plate, and the centers of the circles are coaxial. The special round screw (32) of the rectangular tube connecting plate passes through the special irregular bolt hole (23) of the rectangular tube connecting plate.
3. The formwork support and fixing device for a horizontal tie beam in a masonry structure according to claim 2, characterized in that, The special connecting bolt (4) for rectangular connecting plates includes a special hexagonal nut (41) for rectangular connecting plates, a special irregular screw (42) for rectangular connecting plates, and a special round threaded screw (43) for rectangular connecting plates. The special hexagonal nut (41), the special irregular screw (42), and the special round threaded screw (43) for rectangular connecting plates are fixedly connected in sequence. The shape of the special irregular screw (42) for rectangular connecting plates is consistent with the special irregular bolt hole (24) of the upper connecting plate and the special irregular bolt hole (13) of the lower connecting plate, which is a coaxial circular and elliptical cross. The special irregular screw (42) for rectangular connecting plates passes through the special irregular bolt hole (24) of the upper connecting plate and the special irregular bolt hole (13) of the lower connecting plate. A washer (46) and a spring washer (45) are sequentially sleeved on the special round threaded screw (43) for rectangular connecting plates and a nut (44) is screwed on.
4. The formwork support and fixing device for a horizontal tie beam in a masonry structure according to claim 1, characterized in that, The limiting baffle (11), the rectangular lower connecting plate (12), the lower solid installation and dismantling hammer lug (14), the upper solid installation and dismantling hammer lug (15), the rectangular upper connecting plate (21), and the rectangular tube connecting plate (22) are all made of aluminum alloy.
5. The formwork support and fixing device for a horizontal tie beam in a masonry structure according to claim 3, characterized in that, The total thickness of the limiting baffle (11) is 20mm, the wall thickness is 3mm, the total width is 50mm, and the total height is 150mm. The total thickness of the rectangular lower connecting plate (12) is 20mm, the wall thickness is 5mm, the height is 20mm, and the width is 50mm. The total thickness of the rectangular upper connecting plate (21) is 20mm, the wall thickness is 5mm, the height is 20mm, and the width is 50mm. The total thickness of the rectangular tube connecting plate (22) is 20mm, the wall thickness is 3mm, the height is 30mm, and the width is 350mm. The spacing between the irregular bolt holes (23) of the rectangular tube connecting plate is 10mm.
6. The formwork support and fixing device for a masonry structure concrete horizontal tie beam according to claim 5, characterized in that, The diameter of the special hexagonal nut (31) for the rectangular tube connecting plate is 20mm and the thickness is 10mm. The diameter of the special round screw (32) for the rectangular tube connecting plate is 6mm and the length is 43mm. The length of the special irregular screw (33) for the rectangular tube connecting plate is 10mm.
7. The formwork support and fixing device for a horizontal tie beam in a masonry structure according to claim 6, characterized in that, The diameter of the special hexagonal nut (41) for the rectangular connecting plate is 20mm and the thickness is 10mm. The length of the special irregular screw (42) for the rectangular connecting plate is 40mm, the diameter of the circle is 8mm, the height of the elliptical protrusion is 4mm, and the diameter of the special circular threaded screw (43) for the rectangular connecting plate is 8mm and the length is 20mm.