A concrete pier column steel bar positioning device

Abstract

The application relates to the technical field of concrete pier construction, and discloses a concrete pier steel bar positioning device, which comprises a positioning assembly for positioning the spacing of steel bars, the positioning assembly comprises a first positioning plate and a second positioning plate, a plurality of first positioning holes for inserting the steel bars are formed in the first positioning plate, a plurality of second positioning holes for inserting the steel bars are formed in the second positioning plate, the first positioning holes and the second positioning holes are aligned, a first insertion plate capable of being inserted into the second positioning holes is fixed on the first positioning plate, an inclined surface is arranged on the side of the first insertion plate away from the steel bars, the width of the side of the first insertion plate away from the first positioning plate is smaller than the width of the side close to the first positioning plate, and a pressing piece for making the first positioning plate and the second positioning plate close to each other is further arranged between the first positioning plate and the second positioning plate. The application has the effects of improving the positioning accuracy of the pier reserved steel bars and facilitating the subsequent installation of the pier.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of concrete pier construction, in particular to a concrete pier steel bar positioning device. BACKGROUND

[0002] When prefabricating a concrete pier, a positioning device is needed to position multiple steel bars first, and then concrete is poured, so that the lower end of the steel bar is fixed to the pier, and the upper end of the steel bar can be accurately installed in the reserved hole on the bent cap.

[0003] At present, in the related prefabricated concrete pier construction process, the distance between multiple steel bars needs to be measured by manual measurement, and then the steel bars are bound, so that the positioning mode of the steel bars has a large error, resulting in inaccurate positioning of the pier reserved steel bars, and even causing the subsequent concrete pier to be unable to be normally installed. SUMMARY

[0004] In order to improve the positioning accuracy of the pier reserved steel bars and facilitate the subsequent installation of the pier, the application provides a concrete pier steel bar positioning device.

[0005] The concrete pier steel bar positioning device provided by the application adopts the following technical scheme:

[0006] A concrete pier steel bar positioning device comprises a positioning assembly for positioning the spacing of steel bars, the positioning assembly comprises a first positioning plate and a second positioning plate, a plurality of first positioning holes for inserting steel bars are formed in the first positioning plate, a plurality of second positioning holes for inserting steel bars are formed in the second positioning plate, the first positioning holes and the second positioning holes are aligned, a first insertion plate that can be inserted into the second positioning hole is fixed to the first positioning plate, an inclined surface is arranged on the side of the first insertion plate away from the steel bars, so that the width of the side of the first insertion plate away from the first positioning plate is smaller than the width of the side close to the first positioning plate, and a pressing member that allows the first positioning plate and the second positioning plate to approach each other is further arranged between the first positioning plate and the second positioning plate.

[0007] By adopting the above technical scheme, when multiple steel bars need to be positioned, the steel bars are inserted into the first positioning holes and the second positioning holes at the same time, when the first positioning plate and the second positioning plate approach each other under the action of the pressing member, the first insertion plate can be further pressed against the side wall of the steel bar under the action of the inclined surface of the first insertion plate, so that the position of the steel bar in the first positioning hole and the second positioning hole is more stable, and at the same time, the positioning assembly can adapt to steel bars of different diameters and ensure the accuracy and stability of the positioning of the steel bars, thereby ensuring the normal installation of the pier in the subsequent construction.

[0008] Optionally, the second positioning plate is fixed with a second insertion plate which can be inserted into the first positioning hole, the second insertion plate is arranged opposite to the first insertion plate on both sides of the steel bar, and an inclined surface is arranged on the side of the second insertion plate away from the steel bar, so that the width of the side of the second insertion plate away from the second positioning plate is smaller than the width of the side close to the second positioning plate.

[0009] By adopting the above technical scheme, the second insertion plate and the first insertion plate jointly clamp and fix the steel bar, so that the positioning assembly can meet the positioning requirement of steel bars with different diameters and reduce the bending deformation of the steel bar caused by manual binding.

[0010] Optionally, the abutting member comprises an abutting bolt, a waist-shaped hole is formed in each of the first positioning plate and the second positioning plate, the abutting bolt penetrates through the waist-shaped hole, and a threaded nut is connected to the end of the abutting bolt penetrating out of the waist-shaped hole, and the threaded nut abuts against the side of the second positioning plate away from the first positioning plate.

[0011] By adopting the above technical scheme, the first positioning plate and the second positioning plate are fixed by the abutting bolt and the threaded nut, and in the process of the first positioning plate and the second positioning plate approaching each other, the first insertion plate and the second insertion plate approach each other to clamp the steel bar, so as to further realize the stable positioning of the steel bar.

[0012] Optionally, the number of the positioning assemblies is multiple, the multiple positioning assemblies are arranged at intervals along the length direction of the steel bar, at least two positioning ring plates are arranged between adjacent two positioning assemblies, an insertion hole is formed in each of the positioning ring plates for the steel bar to pass through, an installation groove is formed in the side of each of the positioning ring plates away from the insertion hole, and an insertion rod is arranged between the positioning ring plates, the insertion rod penetrates through the installation grooves, threaded nuts are installed at both ends of the insertion rod, and the threaded nuts abut against the positioning ring plates.

[0013] By adopting the above technical scheme, the positioning accuracy of the positioning assembly is further improved, the insertion rod is inserted into the installation grooves when the installation grooves of the adjacent two positioning ring plates are aligned, and both ends of the insertion rod are fixed by the threaded nuts, so as to further ensure the positioning accuracy of the steel bar in the vertical direction and reduce the bending deformation of the steel bar caused by binding.

[0014] Optionally, the adjustment assembly for adjusting the distance between the adjacent two positioning ring plates is further provided.

[0015] By adopting the above technical scheme, the distance between the positioning ring plates is adjusted by the adjustment assembly, so that the length direction of the steel bar can be accurately positioned, and the situation that the pier prefabricated part cannot be used due to the bending deformation of the steel bar is reduced.

[0016] Optionally, the adjusting assembly comprises a hoop mounted on the steel bar, the hoop is located between two adjacent positioning ring plates, a threaded rod is rotatably mounted on the side of the hoop away from the steel bar, the threaded rod penetrates through the middle section of the inserting rod, a sliding block is threadedly connected to the threaded rod, the sliding block is located on the side of the inserting rod away from the steel bar, an extending rod is hinged to the side of the sliding block close to the positioning ring plate, and the extending rod is hinged to the positioning ring plate at the end away from the sliding block.

[0017] By adopting the above technical scheme, the sliding block slides on the threaded rod along the length direction of the threaded rod by rotating the threaded rod, and the distance between the positioning ring plates is adjusted under the action of the extending rod. When the sliding block slides to the side close to the inserting rod, the sliding block abuts against the inserting rod. Since the two ends of the inserting rod are abutted against the positioning ring plates through the mounting nuts, the adjusting assembly can support and position the steel bar in the vertical direction, thereby reducing the inclination and deformation of the steel bar in the process of pouring concrete to form the pier column.

[0018] Optionally, the end of the threaded rod away from the hoop is fixed with a rotating block, and the diameter of the rotating block is greater than the diameter of the threaded rod.

[0019] By adopting the above technical scheme, the rotating block is installed to facilitate the rotation of the threaded rod, and the sliding of the sliding block on the threaded rod is limited, thereby reducing the condition that the sliding block completely separates from the threaded rod.

[0020] Optionally, the installation groove is a strip-shaped groove, the length direction of the installation groove is perpendicular to the length direction of the steel bar, a clamping block is slidably mounted on the inserting rod, the clamping block is located between the mounting nut and the positioning ring plate, a connecting rod is hinged to the side of the clamping block close to the steel bar, and the end of the connecting rod away from the clamping block is hinged to the positioning assembly.

[0021] By adopting the above technical scheme, the sliding block abuts against the inserting rod during the rotation of the threaded rod, and the inserting rod can slide along the length direction of the installation groove at this time. Under the action of the connecting rod, the distance between the positioning assembly and the positioning ring plate is adjusted, that is, the positioning effect on the steel bar is ensured, and the inclination or bending deformation of the steel bar in the process of pouring concrete is reduced, thereby ensuring that the pier column prefabricated part can be normally installed in the subsequent construction and ensuring the construction quality.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. When multiple reinforcing bars need to be positioned, the reinforcing bars are simultaneously inserted into the first positioning hole and the second positioning hole. When the first positioning plate and the second positioning plate approach each other under the action of the clamping member, the inclined surface of the first insert plate can further press the first insert plate against the side wall of the reinforcing bar, making the position of the reinforcing bar in the first positioning hole and the second positioning hole more stable. At the same time, when the diameter of the reinforcing bar changes, the positioning component can adapt to reinforcing bars of different diameters and ensure the accuracy and stability of the reinforcing bar positioning, thereby ensuring the normal installation of the pier column in subsequent construction.

[0024] 2. The adjusting component adjusts the distance between the positioning ring plates to ensure that the length direction of the reinforcing bar can be accurately positioned, reducing the possibility of bending deformation of the reinforcing bar that would render the precast pier column unusable;

[0025] 3. By rotating the threaded rod, the sliding block slides along the length of the threaded rod. Under the action of the extension rod, the distance between the positioning ring plates is adjusted. When the sliding block slides to the side close to the insertion rod, the sliding block abuts against the insertion rod. Since both ends of the insertion rod are abutted against the positioning ring plates by the installation nuts, the adjustment component ensures the vertical support and positioning of the reinforcing bars, reducing the possibility of tilting and deformation of the reinforcing bars during the subsequent pouring of concrete to form the pier column. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the positioning components, adjustment components, and reinforcing bars.

[0027] Figure 2 This is a structural diagram of the positioning components and reinforcing bars.

[0028] Figure 3 This is a cross-sectional view of the positioning component.

[0029] Figure 4 This is a schematic diagram of the adjustment component.

[0030] Figure 5 This is a cross-sectional view of the adjustment component.

[0031] Explanation of reference numerals in the attached drawings: 1. Positioning component; 11. First positioning plate; 111. First positioning hole; 112. First insert plate; 12. Second positioning plate; 121. Second positioning hole; 122. Second insert plate; 13. Clamping component; 131. Clamping bolt; 132. Clamping nut; 133. Waist-shaped hole; 2. Positioning ring plate; 21. Insertion hole; 22. Mounting groove; 23. Insert rod; 231. Insertion port; 24. Mounting nut; 3. Adjusting component; 31. Clamping clamp; 311. Rotating groove; 32. Threaded rod; 321. Limiting block; 322. Rotating block; 33. Sliding block; 34. Extending rod; 35. Clamping block; 36. Connecting rod; 4. Reinforcing bar. DETAILED DESCRIPTION

[0032] The application will be further described in detail below. Figures 1-5 The application will be further described in detail below.

[0033] The application discloses a concrete pier column reinforcing steel bar positioning device.

[0034] Referring to Figure 1 The concrete pier column reinforcing steel bar 4 positioning device comprises a positioning assembly 1 for adjusting the spacing between a plurality of reinforcing steel bars 4, and the number of the positioning assemblies 1 is multiple, and the number of the positioning assemblies 1 in the embodiment is two, the two positioning assemblies 1 are arranged at intervals along the length direction of the reinforcing steel bars 4, and a plurality of positioning ring plates 2 are further fixed between the two adjacent positioning assemblies 1, and the number of the positioning ring plates 2 in the embodiment is two, the two positioning ring plates 2 are located between the two positioning assemblies 1, and the positioning device further comprises an adjusting assembly 3 for positioning the length direction of the reinforcing steel bars 4, the adjusting assembly 3 can adjust the distance between the positioning ring plates 2 and the positioning assemblies 1, thereby positioning and supporting the vertical direction of the reinforcing steel bars 4, reducing the inclination and bending of the reinforcing steel bars 4 in the process of pouring concrete to form a pier column, and ensuring the construction quality in the subsequent process.

[0035] Referring to Figure 2 The positioning assembly 1 comprises a first positioning plate 11 and a second positioning plate 12, the first positioning plate 11 is four long strip-shaped plates, and the four first positioning plates 11 can jointly form a rectangular frame, the second positioning plate 12 is a rectangular frame, a plurality of first positioning holes 111 are formed at intervals on the first positioning plate 11, a plurality of second positioning holes 121 are formed at intervals on the second positioning plate 12, and the first positioning holes 111 and the second positioning holes 121 are oppositely arranged, so that the reinforcing steel bars 4 can simultaneously penetrate through the first positioning holes 111 and the second positioning holes 121.

[0036] Referring to Figure 2 and Figure 3 A plurality of first plug plates 112 are vertically fixed on the first positioning plate 11, the number of the first plug plates 112 is the same as that of the first positioning holes 111, the first plug plates 112 can be vertically inserted into the second positioning holes 121, a plurality of second plug plates 122 are vertically fixed on the second positioning plate 12, the number of the second plug plates 122 is the same as that of the second positioning holes 121, the second plug plates 122 can be vertically inserted into the first positioning holes 111, and the projections of the first plug plates 112 and the second plug plates 122 in the vertical direction are not in the same plane.

[0037] When the first inserting plate 112 is inserted into the second positioning hole 121, and the second inserting plate 122 is inserted into the first positioning hole 111 at the same time, the steel bar 4 is located between the first inserting plate 112 and the second inserting plate 122. The side of the first inserting plate 112 away from the steel bar 4 is provided with an inclined slope, so that the width of the side of the first inserting plate 112 away from the first positioning plate 11 is smaller than the width of the side of the first inserting plate 112 close to the first positioning plate 11. The side of the second inserting plate 122 away from the steel bar 4 is provided with an inclined slope, so that the width of the side of the second inserting plate 122 away from the second positioning plate 12 is smaller than the width of the side of the second inserting plate 122 close to the second positioning plate 12. When the first mounting plate and the second mounting plate are close to each other, the slope of the first inserting plate 112 abuts against the side wall of the second positioning hole 121, and the slope of the second inserting plate 122 abuts against the side wall of the first positioning hole 111, so that the first inserting plate 112 and the second inserting plate 122 are close to each other and abut against the steel bar 4, thereby enabling the positioning assembly 1 to adapt to steel bars 4 of different diameters, and increasing the contact area of the first inserting plate 112 and the second inserting plate 122 with the steel bar 4, and reducing the possibility of deformation of the steel bar 4 caused by manual binding.

[0038] The positioning assembly 1 further comprises abutting members 13 for enabling the first positioning plate 11 and the second positioning plate 12 to be close to each other. The number of the abutting members 13 is multiple, and the multiple abutting members 13 are arranged at intervals between the first mounting plate and the second mounting plate. The abutting members 13 comprise abutting bolts 131 and abutting nuts 132. The first positioning plate 11 and the second positioning plate 12 are both provided with waist-shaped holes 133 of the same shape. The abutting bolts 131 simultaneously penetrate the waist-shaped holes 133 of the first positioning plate 11 and the second positioning plate 12, and the part of the abutting bolts 131 penetrating out is fixed by the abutting nuts 132, thereby realizing the fixation of the first positioning plate 11 and the second positioning plate 12, and realizing the clamping fixation of the steel bar 4.

[0039] Referring to Figure 4The positioning ring plate 2 is a rectangular frame, and a plurality of insertion holes 21 are arranged on the positioning ring plate 2 at intervals, the number of the insertion holes 21 is the same as the number of the first positioning holes 111 and the second positioning holes 121, the reinforcing bars 4 can vertically penetrate the first positioning holes 111, the insertion holes 21 and the second positioning holes 121 at the same time, mounting grooves 22 are arranged on the side of the positioning ring plate 2 away from the insertion holes 21, the mounting grooves 22 are long strip-shaped grooves, and the length direction of the mounting grooves 22 is perpendicular to the length direction of the reinforcing bars 4, the mounting grooves 22 on the two positioning ring plates 2 are oppositely arranged, and a plug rod 23 is further arranged between the two positioning ring plates 2, the plug rod 23 can penetrate the mounting grooves 22 on the two positioning ring plates 2 at the same time, the plug rod 23 can slide horizontally in the mounting grooves 22, mounting nuts 24 are threadedly arranged at the two ends of the plug rod 23, when the positioning ring plate 2 is arranged on the reinforcing bar 4, the adjacent two mounting grooves 22 are in the state of mutual alignment by inserting the plug rod 23, and the mounting nuts 24 are tightened and fixed, the plug rod 23 further enhances the state that the reinforcing bar 4 can keep vertical in the vertical direction, and reduces the bending deformation of the reinforcing bar 4.

[0040] With reference to Figure 4 and Figure 5 The adjusting assembly 3 can adjust the distance between the two adjacent positioning ring plates 2, the adjusting assembly 3 comprises a hoop 31 arranged on the reinforcing bar 4, the hoop 31 is located between the two adjacent positioning ring plates 2, a threaded rod 32 is rotatably arranged on the side of the hoop 31 away from the reinforcing bar 4, the threaded rod 32 is horizontally arranged, one side of the hoop 31 is tightly arranged with the reinforcing bar 4, and a rotating groove 311 for the rotation of the threaded rod 32 is arranged on the other side of the hoop 31, a circular limiting block 321 is fixed to one end of the threaded rod 32 close to the hoop 31, the diameter of the limiting block 321 is greater than the diameter of the threaded rod 32, the limiting block 321 can rotate in the rotating groove 311 while the limiting block 321 does not separate from the rotating groove 311, so that the threaded rod 32 can be rotatably connected with the hoop 31.

[0041] A rotating block 322 is fixed to the end of the threaded rod 32 away from the limiting block 321, the diameter of the rotating block 322 is greater than the diameter of the threaded rod 32, so as to facilitate the rotation of the threaded rod 32.

[0042] The middle section of the inserting rod 23 is provided with an insertion hole 231 through which the threaded rod 32 horizontally penetrates, so that the inserting rod 23 is perpendicular to the threaded rod 32. The threaded rod 32 is further threadedly connected with a sliding block 33, and the sliding block 33 is located between the rotating block 322 and the inserting rod 23. The sliding block 33 is hingedly connected with a plurality of extending rods 34 near the side edge of the positioning ring plate 2, and the extending rods 34 are symmetrically arranged about the axis of the threaded rod 32. The extending rods 34 are hingedly connected with the positioning ring plate 2 at the ends away from the sliding block 33. When the threaded rod 32 is rotated, the horizontal sliding of the sliding block 33 can be realized. When the sliding block 33 approaches the inserting rod 23, the positioning ring plate 2 slides in the direction away from each other. After the position of the positioning ring plate 2 is adjusted to the appropriate position by the adjusting assembly 3, the mounting nut 24 is tightened, so that the vertical positioning of the reinforcing steel bars 4 is realized, and the inclination of the reinforcing steel bars 4 is reduced.

[0043] The adjusting assembly 3 further comprises a clamping block 35 slidingly mounted on the inserting rod 23. The clamping block 35 is located between the mounting nut 24 and the positioning ring plate 2. The clamping block 35 is hingedly connected with a connecting rod 36 near the reinforcing steel bars 4. The connecting rod 36 is hingedly connected with the second positioning plate 12 at the side away from the clamping block 35. Therefore, the distance between the positioning ring plate 2 can be adjusted, and the position of the positioning assembly 1 can also be adjusted.

[0044] The implementation principle of the concrete pier column reinforcing steel bar positioning device is as follows:

[0045] In the production of the concrete pier column, the plurality of reinforcing steel bars 4 are first accurately positioned by using the positioning device. The distance between the plurality of reinforcing steel bars 4 can be accurately positioned by the positioning assembly 1 and the positioning ring plate 2. After the distance between the positioning ring plate 2 and the positioning assembly 1 is adjusted by the adjusting assembly 3, the vertical positioning of the reinforcing steel bars 4 is realized, and the inclination of the reinforcing steel bars 4 in the process of pouring concrete is reduced. The rotation of the threaded rod 32 drives the movement of the rotating block 322, so that the distance between the positioning ring plate 2 is adjusted. When the sliding block 33 slides to the side close to the inserting rod 23, the inserting rod 23 is pushed to move to the side close to the reinforcing steel bars 4, so that the position of the positioning assembly 1 is further adjusted. Then, the mounting nut 24 and the abutting nut 132 are tightened in sequence, so that the positioning accuracy of the plurality of reinforcing steel bars 4 is realized, and the vertical positioning of the reinforcing steel bars 4 is also accurately positioned. The inclination of the reinforcing steel bars 4 in the process of pouring concrete is reduced, the normal use of the concrete pier column is ensured, and the construction quality is improved.

[0046] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A concrete pier reinforcement positioning device, characterized by: The positioning assembly (1) for positioning the distance of the reinforcing steel bars (4) comprises a first positioning plate (11) and a second positioning plate (12), the first positioning plate (11) is provided with a plurality of first positioning holes (111) for inserting the reinforcing steel bars (4), the second positioning plate (12) is provided with a plurality of second positioning holes (121) for inserting the reinforcing steel bars (4), the first positioning holes (111) and the second positioning holes (121) are aligned, the first positioning plate (11) is fixed with a first inserting plate (112) which can be inserted into the second positioning hole (121), the side of the first inserting plate (112) away from the reinforcing steel bars (4) is provided with an inclined surface, the width of the side of the first inserting plate (112) away from the first positioning plate (11) is smaller than the width of the side of the first inserting plate (112) close to the first positioning plate (11), and a pressing member (13) is further arranged between the first positioning plate (11) and the second positioning plate (12) to make the first positioning plate (11) and the second positioning plate (12) close to each other; The adjusting assembly (3) for adjusting the distance between the adjacent two positioning ring plates (2) is further provided; The adjusting assembly (3) comprises a hoop (31) arranged on the reinforcing steel bars (4), the hoop (31) is located between the adjacent two positioning ring plates (2), a threaded rod (32) is rotatably arranged on the side of the hoop (31) away from the reinforcing steel bars (4), the threaded rod (32) penetrates through the middle segment of the inserting rod (23), a sliding block (33) is further threadedly connected to the threaded rod (32), the sliding block (33) is located on the side of the inserting rod (23) away from the reinforcing steel bars (4), and an extending rod (34) is hingedly connected to the side of the sliding block (33) close to the positioning ring plate (2), and one end of the extending rod (34) away from the sliding block (33) is hingedly connected to the positioning ring plate (2).

2. A concrete pier reinforcement positioning device according to claim 1, characterised in that: The second positioning plate (12) is fixed with a second inserting plate (122) which can be inserted into the first positioning hole (111), the second inserting plate (122) is arranged opposite to the first inserting plate (112) on both sides of the reinforcing steel bars (4), the side of the second inserting plate (122) away from the reinforcing steel bars (4) is provided with an inclined surface, and the width of the side of the second inserting plate (122) away from the second positioning plate (12) is smaller than the width of the side of the second inserting plate (122) close to the second positioning plate (12).

3. A concrete pier reinforcement positioning device as defined in claim 1 wherein: The pressing member (13) comprises a pressing bolt (131), the first positioning plate (11) and the second positioning plate (12) are both provided with a waist-shaped hole (133), the pressing bolt (131) penetrates through the waist-shaped hole (133), one end of the pressing bolt (131) out of the waist-shaped hole (133) is threadedly connected with a pressing nut (132), and the pressing nut (132) is pressed against the side of the second positioning plate (12) away from the first positioning plate (11).

4. The concrete pier reinforcement positioning device of claim 1, wherein: The quantity of the positioning assembly (1) is multiple, multiple positioning assembly (1) is arranged along the length direction of steel bar (4) interval, at least two positioning ring plate (2) is equipped between two adjacent positioning assembly (1), the positioning ring plate (2) is equipped with the insertion hole (21) for steel bar (4) to pass through, the side of positioning ring plate (2) away from insertion hole (21) is equipped with installation slot (22), still be equipped with the insertion rod (23) between positioning ring plate (2), the insertion rod (23) passes through installation slot (22), and both ends of insertion rod (23) are threadedly installed with installation nut (24), installation nut (24) is tightly closed on positioning ring plate (2).

5. The concrete pier reinforcement positioning device of claim 1, wherein: The end of the threaded rod (32) away from the hoop (31) is fixed with a rotating block (322), the diameter of the rotating block (322) is greater than the diameter of the threaded rod (32).

6. A concrete pier reinforcement positioning device as defined in claim 4 wherein: The installation slot (22) is a strip-shaped slot, the length direction of the installation slot (22) is perpendicular to the length direction of the steel bar (4), the insertion rod (23) is further slidably installed with a clamping block (35), the clamping block (35) is located between the installation nut (24) and the positioning ring plate (2), the side of the clamping block (35) close to the steel bar (4) is hingedly connected with a connecting rod (36), the end of the connecting rod (36) away from the clamping block (35) is hingedly connected with the positioning assembly (1).

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