Positioning device of steel structure foundation bolt embedded structure

Abstract

The utility model relates to a positioning device of a steel structure foundation bolt embedded structure, an upper positioning plate and a lower positioning plate are arranged in parallel at an interval, four upper measuring rulers are overlapped in sequence to form an upper rectangular frame structure, and four lower measuring rulers are overlapped in sequence to form a lower rectangular frame structure. The four corners of the upper rectangular frame structure are clamped and positioned through upper corner positioning blocks, and the four corners of the lower rectangular frame structure are clamped and positioned through lower corner positioning blocks. The upper positioning plate is placed above the upper rectangular frame structure and is positioned through the upper side positioning block, the lower positioning plate is placed above the lower rectangular frame structure and is positioned through the lower side positioning block, and a plurality of upper positioning holes which are annularly distributed at intervals are formed in the upper positioning plate; a plurality of lower positioning holes which are annularly distributed at intervals are formed in the lower positioning plate, and the upper positioning holes and the lower positioning holes are formed in the vertical direction in a one-to-one correspondence mode; and at least one axis screw rod is arranged on each upper measuring scale and the corresponding lower measuring scale.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a positioning device for a pre-embedded structure of steel structure anchor bolts. Background Technology

[0002] In modern building and infrastructure construction, steel structures are widely used due to their advantages such as high strength, lightweight, high plasticity, and fast construction speed. In steel structure buildings, anchor bolts are key components connecting the foundation and the superstructure; their stability directly affects the safety and stability of the entire building. Therefore, ensuring the precise positioning of anchor bolts during the pre-embedding process is crucial. Utility Model Content

[0003] In order to solve one or more technical problems existing in the prior art, this utility model provides a positioning device for the pre-embedded structure of steel structure anchor bolts.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A positioning device for a pre-embedded structure of steel structure anchor bolts includes an upper positioning plate, a lower positioning plate, an upper corner positioning block, a lower corner positioning block, an upper side positioning block, a lower side positioning block, an upper measuring ruler, a lower measuring ruler, and an axis screw. The upper and lower positioning plates are arranged parallel to each other at intervals. There are four upper measuring rulers and four lower measuring rulers. The four upper measuring rulers are stacked on top of each other to form an upper rectangular frame structure, and the four lower measuring rulers are stacked on top of each other to form a lower rectangular frame structure. The four corners of the upper rectangular frame structure are respectively positioned by the upper corner positioning blocks, and the four corners of the lower rectangular frame structure are respectively positioned by the lower corner positioning blocks. The upper positioning plate is placed above the upper rectangular frame structure and positioned with the upper rectangular frame structure by the upper side positioning block. The lower positioning plate is placed above the lower rectangular frame structure and positioned with the lower rectangular frame structure by the lower side positioning block. The upper positioning plate is provided with multiple upper positioning holes arranged at intervals along a ring, and the lower positioning plate is provided with multiple lower positioning holes arranged at intervals along a ring. The multiple upper positioning holes and multiple lower positioning holes are arranged one-to-one in the vertical direction. Each upper measuring scale and the corresponding lower measuring scale are provided with at least one axial screw. The axial screw is parallel to the axis of the upper positioning plate and the axis of the lower positioning plate, respectively. The lower ends of the multiple axial screws extend out of the lower positioning plate by the same length.

[0005] The beneficial effects of this utility model are as follows: By employing a positioning device for the pre-embedded structure of steel structure anchor bolts, this utility model ensures the accuracy of the pre-embedded position. This positioning device not only improves project quality and safety but also enhances economic benefits through optimized construction techniques and material selection.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, multiple upper positioning holes are evenly spaced along the circumference of the upper positioning plate, and multiple lower positioning holes are evenly spaced along the circumference of the lower positioning plate.

[0008] Furthermore, the upper positioning plate is a rectangular ring structure, the lower positioning plate is a rectangular ring structure, and the structural dimensions of the upper positioning plate are the same as those of the lower positioning plate.

[0009] The beneficial effect of adopting the above-mentioned further solution is that by setting up the upper and lower positioning plates of the rectangular ring structure, it is convenient to fit onto the foundation frame columns on site.

[0010] Furthermore, the axial screws are respectively disposed on the outer periphery of the upper positioning plate and the lower positioning plate.

[0011] Furthermore, the axial screw is fixed to the upper rectangular frame structure and the lower rectangular frame structure by a nut.

[0012] Furthermore, the upper corner positioning block includes a first upper connecting channel and a second upper connecting channel arranged vertically. The through direction of the first upper connecting channel is perpendicular to the through direction of the second upper connecting channel. The two adjacent upper measuring rulers of the upper rectangular frame structure are respectively inserted into the first upper connecting channel and the second upper connecting channel.

[0013] The lower corner positioning block includes a first lower connecting channel and a second lower connecting channel arranged vertically. The through direction of the first lower connecting channel is perpendicular to the through direction of the second lower connecting channel. The two adjacent lower measuring rulers of the lower rectangular frame structure are respectively inserted into the first lower connecting channel and the second lower connecting channel.

[0014] The beneficial effects of adopting the above-mentioned further solution are: by setting the first upper connecting channel and the second upper connecting channel, it is convenient to snap and position the two adjacent upper measuring scales; by setting the first lower connecting channel and the second lower connecting channel, it is convenient to snap and position the two adjacent lower measuring scales.

[0015] Furthermore, the upper corner positioning block is provided with an upper corner positioning bolt, the upper corner positioning bolt being threaded through the first upper connecting channel and abutting against the upper measuring scale inside the first upper connecting channel;

[0016] The lower corner positioning block is provided with a lower corner positioning bolt, which is threaded through the first lower connecting channel and abuts against the lower measuring scale inside the first lower connecting channel.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting the upper corner positioning bolt and the lower corner positioning bolt, it is convenient to tighten and position the measuring scale inside the upper corner positioning block and the lower corner positioning block.

[0018] Furthermore, the first upper connecting channel and the second upper connecting channel are interconnected in the vertical direction, and the first lower connecting channel and the second lower connecting channel are interconnected in the vertical direction.

[0019] Furthermore, both the upper and lower positioning blocks are side-mounted U-shaped structures. The upper positioning block is clamped on the outer periphery of the upper measuring scale and the upper positioning plate, and the lower positioning block is clamped on the outer periphery of the lower measuring scale and the lower positioning plate.

[0020] The beneficial effect of adopting the above-mentioned further solution is that by setting the upper and lower positioning blocks of the side-mounted U-shaped structure, it is convenient to snap the measuring ruler and the corresponding positioning plate into place.

[0021] Furthermore, the upper side positioning block is provided with an upper side positioning bolt, and the lower side positioning block is provided with a lower side positioning bolt. The upper side positioning bolt is threaded through the upper wall of the upper side positioning block and abuts against the upper positioning plate, and the lower side positioning bolt is threaded through the upper wall of the lower side positioning block and abuts against the lower positioning plate.

[0022] The beneficial effect of adopting the above-mentioned further solution is that by setting the side positioning bolts, it is convenient to tighten and position the measuring ruler and the corresponding positioning plate. Attached Figure Description

[0023] Figure 1 A three-dimensional structural schematic diagram of the positioning device for the pre-embedded structure of steel structure anchor bolts of this utility model;

[0024] Figure 2 This is a top view schematic diagram of the positioning device for the pre-embedded structure of steel structure anchor bolts of this utility model.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Upper positioning plate; 2. Lower positioning plate; 3. Upper corner positioning block; 4. Lower corner positioning block; 5. Upper side positioning block; 6. Lower side positioning block; 7. Upper measuring scale; 8. Lower measuring scale; 9. Upper positioning hole; 10. Lower positioning hole; 11. Axis screw; 12. Nut; 13. Upper corner positioning bolt; 14. Lower corner positioning bolt; 15. Upper side positioning bolt; 16. Lower side positioning bolt. Detailed Implementation

[0027] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0028] like Figure 1 and Figure 2 As shown, this embodiment of a positioning device for a pre-embedded steel structure anchor bolt includes an upper positioning plate 1, a lower positioning plate 2, an upper corner positioning block 3, a lower corner positioning block 4, an upper side positioning block 5, a lower side positioning block 6, an upper measuring ruler 7, a lower measuring ruler 8, and an axis screw 11. The upper positioning plate 1 and the lower positioning plate 2 are arranged parallel to each other with a vertical gap. There are four upper measuring rulers 7 and four lower measuring rulers 8. The four upper measuring rulers 7 are stacked on top of each other to form an upper rectangular frame structure, and the four lower measuring rulers 8 are stacked on top of each other to form a lower rectangular frame structure. The four corners of the upper rectangular frame structure are respectively positioned by the upper corner positioning block 3, and the four corners of the lower rectangular frame structure are respectively positioned by the lower corner positioning block 4. The upper positioning plate 1 is placed on the upper rectangular frame. The upper part of the structure is positioned above the upper rectangular frame structure via the upper side positioning block 5. The lower positioning plate 2 is placed above the lower rectangular frame structure and positioned above the lower rectangular frame structure via the lower side positioning block 6. The upper positioning plate 1 has multiple upper positioning holes 9 arranged in a ring at intervals, and the lower positioning plate 2 has multiple lower positioning holes 10 arranged in a ring at intervals. The multiple upper positioning holes 9 and multiple lower positioning holes 10 are arranged one-to-one in the vertical direction. Each upper measuring ruler 7 and the corresponding lower measuring ruler 8 are provided with at least one axial screw 11. The axial screw 11 is parallel to the axis of the upper positioning plate 1 and the axis of the lower positioning plate 2, respectively. The lower ends of the multiple axial screws 11 extend out of the lower positioning plate 2 by the same length, and the lengths of the multiple axial screws 11 are also the same.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, a plurality of upper positioning holes 9 are evenly spaced along the circumference of the upper positioning plate 1, and a plurality of lower positioning holes 10 are evenly spaced along the circumference of the lower positioning plate 2.

[0030] like Figure 1 and Figure 2 As shown, in this embodiment, the upper positioning plate 1 is a rectangular ring structure, and the lower positioning plate 2 is a rectangular ring structure. The structural dimensions of the upper positioning plate 1 and the lower positioning plate 2 are the same. By setting the upper and lower positioning plates with rectangular ring structures, it is convenient to fit them onto the foundation frame columns on site.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, the axial screw 11 is respectively disposed on the outer periphery of the upper positioning plate 1 and the lower positioning plate 2. Preferably, it is disposed at the middle position on one side of the upper positioning plate 1 and the lower positioning plate 2.

[0032] like Figure 1 As shown, in this embodiment, the axial screw 11 is fixed to the upper rectangular frame structure and the lower rectangular frame structure by a nut 12.

[0033] like Figure 1 As shown, the upper corner positioning block 3 in this embodiment includes a first upper connecting channel and a second upper connecting channel arranged vertically. The through direction of the first upper connecting channel is perpendicular to the through direction of the second upper connecting channel. Two adjacent upper measuring rulers 7 of the upper rectangular frame structure are respectively inserted into the first upper connecting channel and the second upper connecting channel. The lower corner positioning block 4 includes a first lower connecting channel and a second lower connecting channel arranged vertically. The through direction of the first lower connecting channel is perpendicular to the through direction of the second lower connecting channel. Two adjacent lower measuring rulers 8 of the lower rectangular frame structure are respectively inserted into the first lower connecting channel and the second lower connecting channel. By setting the first upper connecting channel and the second upper connecting channel, it is convenient to lock and position two adjacent upper measuring rulers; by setting the first lower connecting channel and the second lower connecting channel, it is convenient to lock and position two adjacent lower measuring rulers.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, the upper corner positioning block 3 is provided with an upper corner positioning bolt 13, which is threaded through the first upper connecting channel and abuts against the upper measuring scale 7 inside the first upper connecting channel; the lower corner positioning block 4 is provided with a lower corner positioning bolt 14, which is threaded through the first lower connecting channel and abuts against the lower measuring scale 8 inside the first lower connecting channel. By providing the upper corner positioning bolt and the lower corner positioning bolt, it is convenient to tighten and position the measuring scale inside the upper corner positioning block and the lower corner positioning block.

[0035] In one specific embodiment, the first upper connecting channel and the second upper connecting channel are interconnected in the vertical direction, and the first lower connecting channel and the second lower connecting channel are interconnected in the vertical direction.

[0036] like Figure 1 As shown, in this embodiment, both the upper positioning block 5 and the lower positioning block 6 are side-mounted U-shaped structures. The upper positioning block 5 is clamped on the outer periphery of the upper measuring ruler 7 and the upper positioning plate 1, and the lower positioning block 6 is clamped on the outer periphery of the lower measuring ruler 8 and the lower positioning plate 2. By setting the upper and lower positioning blocks with side-mounted U-shaped structures, it is convenient to snap and position the measuring ruler and the corresponding positioning plate.

[0037] like Figure 1As shown, in this embodiment, the upper side positioning block 5 is provided with an upper side positioning bolt 15, and the lower side positioning block 6 is provided with a lower side positioning bolt 16. The upper side positioning bolt 15 is threaded through the upper wall of the upper side positioning block 5 and abuts against the upper positioning plate 1, and the lower side positioning bolt 16 is threaded through the upper wall of the lower side positioning block 6 and abuts against the lower positioning plate 2. By providing side positioning bolts, it is convenient to tighten and position the measuring ruler and the corresponding positioning plate.

[0038] In this embodiment, both the upper measuring scale 7 and the lower measuring scale 8 are provided with scales. The axial screw 11 is arranged vertically, and the upper positioning plate 1 and the lower positioning plate 2 are arranged horizontally.

[0039] In this embodiment, upper side positioning blocks 5 can be provided on all four outer sides of the upper positioning plate 1, or only on the two opposite outer sides. Similarly, lower side positioning blocks 6 can be provided on all four outer sides of the lower positioning plate 2, or only on the two opposite outer sides. One side positioning block or two side positioning blocks can be provided on each side.

[0040] In this embodiment, the upper positioning plate 1 and the lower positioning plate 2 preferably adopt a square frame structure. Each corner of the upper positioning plate 1 is provided with an upper positioning hole 9. In addition to the corners, at least one upper positioning hole 9 is also provided on the frame edge of the upper positioning plate 1, preferably two upper positioning holes 9 are provided. Each corner of the lower positioning plate 2 is provided with a lower positioning hole 10. In addition to the corners, at least one lower positioning hole 10 is also provided on the frame edge of the lower positioning plate 2, preferably two lower positioning holes 10 are provided.

[0041] This embodiment employs a positioning device for pre-embedded steel structure anchor bolts. When using this device, it's necessary to confirm the height of the pre-embedded bolts, the height of the concrete pouring, and the length of the bolts to be pre-embedded. It's crucial to ensure that the axis markings on the positioning plate in both longitudinal and transverse directions align with the center point of the measuring ruler, guaranteeing that the axis points of the positioning plate, the center point of the measuring ruler, and the bottom end of the axis screw are all on the same plane. Then, during the on-site installation of the foundation frame columns, a rectangular frame structure formed by the measuring ruler is placed on the axis of the foundation frame columns, ensuring that the center lines in both longitudinal and transverse directions coincide with the center lines of the foundation frame columns. Next, the pre-embedded bolts for the foundation frame columns are inserted into the positioning holes on the positioning plate. The pre-embedded bolts must pass through both the upper and lower positioning holes. After all the pre-embedded bolts for the foundation frame columns are inserted, they are welded to the foundation frame columns. The entire positioning device can then be removed to proceed to the next step. This positioning device enables precise installation of the pre-embedded bolts. This precision not only reduces adjustment work during construction but also ensures the stability of the pre-embedded bolt reinforcement, avoids the risk of displacement due to concrete flow, and guarantees that the mechanical properties of the pre-embedded bolts are not damaged. The use of this positioning device eliminates the potential for errors caused by positioning misalignment, ensuring a secure fixation and facilitating installation and adjustment, thereby further improving construction efficiency and quality. Simultaneously, the design of the positioning device also considers ease of construction. Adopting this device increases its turnover and reuse rate, saving labor and material costs and significantly shortening the construction cycle. Regarding structural stability and safety, the device enhances the reliability of the connection between the steel and concrete structures through precisely pre-embedded bolts, thus improving the overall stability and safety of the building structure. The reliability of this connection method is not only reflected in its ability to withstand greater tensile and shear forces, meeting the special requirements of the building structure, but also in its ability to reduce the amount of on-site welding and bolting work, further improving construction efficiency.

[0042] This embodiment employs an independent support system, which can precisely fix the position of the bolts and effectively prevent structural problems caused by construction errors. Simultaneously, the materials and processing technology of the device have been carefully selected and optimized to ensure its durability and stability during use. This not only improves project quality and safety but also reduces operational steps by optimizing the construction process, making anchor bolt pouring more convenient and faster, thereby improving construction efficiency and achieving enhanced economic benefits.

[0043] This embodiment uses a positioning device for the pre-embedded steel structure anchor bolt to ensure the accuracy of the pre-embedded position.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A positioning device for a pre-embedded structure of anchor bolts in a steel structure, characterized in that, The system includes an upper positioning plate, a lower positioning plate, upper corner positioning blocks, lower corner positioning blocks, upper side positioning blocks, lower side positioning blocks, an upper measuring scale, a lower measuring scale, and a shaft screw. The upper and lower positioning plates are arranged parallel to each other with a gap between them. There are four upper measuring scales and four lower measuring scales. The four upper measuring scales are stacked on top of each other to form an upper rectangular frame structure, and the four lower measuring scales are stacked on top of each other to form a lower rectangular frame structure. The four corners of the upper rectangular frame structure are respectively positioned by the upper corner positioning blocks, and the four corners of the lower rectangular frame structure are respectively positioned by the lower corner positioning blocks. The upper positioning plate is placed on top of the upper rectangular frame structure. The upper positioning plate is positioned by the upper side positioning block and the upper rectangular frame structure. The lower positioning plate is placed above the lower rectangular frame structure and positioned by the lower side positioning block and the lower rectangular frame structure. The upper positioning plate has multiple upper positioning holes arranged in a ring at intervals, and the lower positioning plate has multiple lower positioning holes arranged in a ring at intervals. The multiple upper positioning holes and multiple lower positioning holes are arranged one-to-one in the vertical direction. Each upper measuring scale and the corresponding lower measuring scale have at least one axial screw. The axial screw is parallel to the axis of the upper positioning plate and the axis of the lower positioning plate, respectively. The lower ends of the multiple axial screws extend out of the lower positioning plate by the same length.

2. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, Multiple upper positioning holes are evenly spaced along the circumference of the upper positioning plate, and multiple lower positioning holes are evenly spaced along the circumference of the lower positioning plate.

3. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, The upper positioning plate is a rectangular ring structure, and the lower positioning plate is a rectangular ring structure. The structural dimensions of the upper positioning plate are the same as those of the lower positioning plate.

4. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, The axial screws are respectively installed on the outer periphery of the upper positioning plate and the lower positioning plate.

5. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, The axial screw is fixed to the upper rectangular frame structure and the lower rectangular frame structure by a nut.

6. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, The upper corner positioning block includes a first upper connecting channel and a second upper connecting channel arranged vertically. The through direction of the first upper connecting channel is perpendicular to the through direction of the second upper connecting channel. The two adjacent upper measuring rulers of the upper rectangular frame structure are respectively inserted into the first upper connecting channel and the second upper connecting channel. The lower corner positioning block includes a first lower connecting channel and a second lower connecting channel arranged vertically. The through direction of the first lower connecting channel is perpendicular to the through direction of the second lower connecting channel. The two adjacent lower measuring rulers of the lower rectangular frame structure are respectively inserted into the first lower connecting channel and the second lower connecting channel.

7. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 6, characterized in that, The upper corner positioning block is provided with an upper corner positioning bolt, and the upper corner positioning bolt is threaded through the first upper connecting channel and abuts against the upper measuring scale inside the first upper connecting channel; The lower corner positioning block is provided with a lower corner positioning bolt, which is threaded through the first lower connecting channel and abuts against the lower measuring scale inside the first lower connecting channel.

8. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 6, characterized in that, The first upper connecting channel and the second upper connecting channel are interconnected in the vertical direction, and the first lower connecting channel and the second lower connecting channel are interconnected in the vertical direction.

9. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 1, characterized in that, Both the upper and lower positioning blocks are side-mounted U-shaped structures. The upper positioning block is clamped on the outer periphery of the upper measuring scale and the upper positioning plate, and the lower positioning block is clamped on the outer periphery of the lower measuring scale and the lower positioning plate.

10. The positioning device for the pre-embedded structure of steel structure anchor bolts according to claim 9, characterized in that, The upper side positioning block is provided with an upper side positioning bolt, and the lower side positioning block is provided with a lower side positioning bolt. The upper side positioning bolt is threaded through the upper wall of the upper side positioning block and abuts against the upper positioning plate. The lower side positioning bolt is threaded through the upper wall of the lower side positioning block and abuts against the lower positioning plate.

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