Construction platform for hollow pier reinforcement binding

Abstract

The application relates to the technical field of engineering construction, and discloses a construction platform for reinforcing banding of a hollow pier, which comprises a supporting mechanism, a supporting frame, vertical rods fixedly connected to the outer side of the supporting frame, and horizontal rods arranged on the outer side of the vertical rods, the bottom end of each horizontal rod is fixedly connected with a supporting rod, the top end of each horizontal rod is fixedly connected with a first convex strip, and the top end of each horizontal rod is fixedly connected with a second convex strip; when the protective net is installed and overhauled, the installation of the protective net can be quickly completed without using tools, compared with the mode of sequentially overhauling by using tools, the firmness of the protective net installation can be judged by observing the height difference between the top handle of the sliding rod and the short rod and the connection state of the clamping block and the buckle, the convenience of installation is greatly improved, high-altitude operation without carrying tools is realized, and the risk of high-altitude falling objects is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of engineering construction, and in particular to a construction platform for binding the reinforcing bars of hollow piers. Background Technology

[0002] Modern bridge pier designs often employ thin-walled hollow piers with curved inner and outer slopes. Climbing formwork construction is used, requiring modification of the formwork for each pier segment. This significant modification severely impacts the construction time for each segment, necessitating the use of reverse formwork on-site. This requires a large amount of reinforcing steel. Due to the large diameter, quantity, and installation difficulty of the steel bars, traditional rectangular pier reinforcement binding platforms are insufficient for the rounded-end, curved, thin-walled hollow piers of this project. Furthermore, the safety netting on these binding platforms is typically bolted, necessitating the constant carrying of tools during installation, dismantling, and maintenance. The more tools carried during high-altitude work, the greater the risk of falling objects. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention is proposed.

[0004] Therefore, the purpose of this invention is to provide a construction platform for tying steel bars in hollow piers, which can meet the requirements for use on thin-walled hollow piers with internal and external slopes, and can also achieve the installation of protective netting without tools.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a construction platform for tying reinforcing bars in hollow piers, comprising,

[0006] The support mechanism includes a support frame, a vertical rod fixedly connected to the outside of the support frame, and a horizontal rod disposed on the outside of the vertical rod. A support rod is fixedly connected to the bottom end of the horizontal rod, a first protruding strip is fixedly connected to the top end of the horizontal rod, and a second protruding strip is fixedly connected to the top end of the horizontal rod.

[0007] Wherein, the first protrusion and the second protrusion form a mounting cavity;

[0008] The protective mechanism includes a pedal disposed inside the mounting cavity, a mounting sleeve fixedly connected to the top of the pedal, and a bottom sleeve fixedly connected to the bottom of the pedal. The outer side of the mounting sleeve is fixedly connected with a buckle, the bottom of the pedal is provided with an operating component, and a protective component is adapted to be installed inside the mounting sleeve.

[0009] As a preferred embodiment of the construction platform for tying reinforcing bars of hollow piers according to the present invention, wherein: a mounting plate is fixedly connected to one end of the horizontal bar and the support bar, and a bolt is threadedly connected to the outer side of the mounting plate, and the horizontal bar and the vertical bar are connected by the bolt.

[0010] As a preferred embodiment of the construction platform for tying reinforcing bars of hollow piers according to the present invention, the operating components include a mounting base fixedly connected to the bottom end of the pedal, a double-ended screw rod rotatably connected to the inner side of the mounting base, and a turntable fixedly connected to the outer side of the double-ended screw rod, wherein limit components are provided at both ends of the double-ended screw rod.

[0011] As a preferred embodiment of the construction platform for tying steel bars in hollow piers according to the present invention, the limiting component includes a limiting rod adapted to the double-ended screw rod, a first ratchet fixedly connected to the outside of the limiting rod, and a second ratchet fixedly connected to the outside of the limiting rod.

[0012] The top end of the limiting rod is slidably connected to the bottom end of the pedal, and the first ratchet and the second ratchet are designed to be misaligned.

[0013] As a preferred embodiment of the construction platform for tying steel bars in hollow piers according to the present invention, the protective component includes a connecting rod inserted into the mounting sleeve, a limiting groove opened on the outside of the connecting rod, and a protective net fixedly connected to the outside of the connecting rod.

[0014] The connecting rod has a verification component on its outer side, a locking component on its inner side, and an auxiliary component at its top.

[0015] As a preferred embodiment of the construction platform for tying steel bars in hollow piers according to the present invention, the inspection component includes a connecting block fixedly connected to the outside of the connecting rod, and a rotating shaft rotatably connected to the inside of the connecting block.

[0016] The rotating shaft is equipped with a torsion spring inside.

[0017] As a preferred embodiment of the construction platform for tying steel bars in hollow piers according to the present invention, the inspection assembly further includes a connecting rod fixedly connected to the outside of the rotating shaft, a locking block disposed at one end of the connecting rod, and a pressure plate fixedly connected to the outside of the rotating shaft.

[0018] The card block is made of rubber.

[0019] As a preferred embodiment of the construction platform for tying reinforcing bars of hollow piers according to the present invention, the locking assembly includes a slide rod slidably connected inside the connecting rod, a ratchet plate fixedly connected to the bottom end of the slide rod, and a handle rotatably connected to the top end of the slide rod.

[0020] As a preferred embodiment of the construction platform for tying reinforcing bars of hollow piers according to the present invention, the locking assembly further includes a fixing plate fixedly connected to the outside of the slide rod, and a return spring sleeved on the outside of the slide rod, wherein the return spring is disposed between the fixing plate and the bottom end of the connecting rod.

[0021] As a preferred embodiment of the construction platform for tying steel bars in hollow piers according to the present invention, the auxiliary component includes an annular frame fixedly connected to the top of the connecting rod, and a short rod fixedly connected to the top of the annular frame.

[0022] The beneficial effects of this invention are: when installing and maintaining the protective net, the installation can be completed quickly without the use of tools. Compared with the method of using tools to perform maintenance in sequence, the firmness of the protective net installation can be judged directly by observing the height difference between the handle at the top of the sliding rod and the short rod, as well as the connection status of the locking block and the buckle. This greatly improves the convenience of installation and eliminates the need to carry tools for high-altitude operations, reducing the risk of falling objects from heights. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a partial structural diagram of the present invention.

[0026] Figure 3 This is a schematic diagram of the overall structure of the crossbar of the present invention.

[0027] Figure 4 This is a schematic diagram of the protective mechanism structure of the present invention.

[0028] Figure 5 This is a front structural diagram of the present invention.

[0029] Figure 6 This is a cross-sectional structural diagram of the present invention.

[0030] Figure 7 This is a schematic diagram of the protective component structure of the present invention. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] Example 1

[0036] Reference Figures 1-6 This is the first embodiment of the present invention, which provides a construction platform for tying reinforcing bars in hollow piers. This device includes,

[0037] The support mechanism 100 includes a support frame 101, a vertical rod 102 fixedly connected to the outside of the support frame 101, and a horizontal rod 103 disposed on the outside of the vertical rod 102. A support rod 104 is fixedly connected to the bottom end of the horizontal rod 103, a first protrusion 105 is fixedly connected to the top end of the horizontal rod 103, and a second protrusion 106 is fixedly connected to the top end of the horizontal rod 103.

[0038] The first protrusion 105 and the second protrusion 106 form an installation cavity;

[0039] The protective mechanism 200 includes a pedal 201 disposed inside the mounting cavity, a mounting sleeve 202 fixedly connected to the top of the pedal 201, and a bottom sleeve 203 fixedly connected to the bottom of the pedal 201. A buckle 204 is fixedly connected to the outside of the mounting sleeve 202. An operating component 205 is provided at the bottom of the pedal 201. A protective component 206 is fitted and installed inside the mounting sleeve 202.

[0040] Specifically, a mounting plate 107 is fixedly connected to one end of the crossbar 103 and the support rod 104. A bolt 108 is threaded on the outer side of the mounting plate 107, and the crossbar 103 and the vertical rod 102 are connected by the bolt 108.

[0041] Furthermore, the operating component 205 includes a mounting base 205a fixedly connected to the bottom end of the pedal 201, a double-ended lead screw 205b rotatably connected to the inner side of the mounting base 205a, and a turntable 205c fixedly connected to the outer side of the double-ended lead screw 205b. Limiting components 205d are provided at both ends of the double-ended lead screw 205b.

[0042] Furthermore, the limiting assembly 205d includes a limiting rod 205d-1 adapted to be installed with the double-ended lead screw 205b, a first ratchet 205d-2 fixedly connected to the outside of the limiting rod 205d-1, and a second ratchet 205d-3 fixedly connected to the outside of the limiting rod 205d-1.

[0043] The top end of the limiting rod 205d-1 is slidably connected to the bottom end of the pedal 201, and the first ratchet 205d-2 and the second ratchet 205d-3 are designed to be misaligned.

[0044] Preferably, the protective component 206 includes a connecting rod 206a inserted into the mounting sleeve 202, a limiting groove 206b formed on the outside of the connecting rod 206a, and a protective net 206c fixedly connected to the outside of the connecting rod 206a.

[0045] The connecting rod 206a has a verification component 206d on its outer side, a locking component 206e inside its inner side, and an auxiliary component 206f at its top.

[0046] It should be noted that the locking assembly 206e includes a slide bar 206e-1 slidably connected inside the connecting rod 206a, a ratchet plate 206e-2 fixedly connected to the bottom end of the slide bar 206e-1, and a handle 206e-3 rotatably connected to the top end of the slide bar 206e-1.

[0047] Preferably, the locking assembly 206e further includes a fixing plate 206e-4 fixedly connected to the outside of the slide bar 206e-1, and a return spring 206e-5 sleeved on the outside of the slide bar 206e-1. The return spring 206e-5 is disposed between the fixing plate 206e-4 and the bottom end of the connecting rod 206a.

[0048] When the equipment is needed, it must first be assembled in an open area. Then, the equipment is hoisted to the designated location for use. Depending on the situation, the horizontal bar 103 is installed on the inside or outside of the vertical bar 102. By setting two sets of equipment on the outside and inside of the thin-walled hollow pier respectively, the steel reinforcement binding on the inside and outside of the thin-walled hollow pier can be achieved.

[0049] When installing the protective net 206c, the connecting rod 206a is inserted into the mounting sleeve 202 until the bottom end of the connecting rod 206a is fully inserted into the bottom sleeve 203. This completes the initial installation of the protective net 206c. Then, by rotating the turntable 205c, the double-ended lead screw 205b will rotate, causing the limiting rods 205d-1 at both ends of the double-ended lead screw 205b to slide and insert into the limiting groove 206b on the outside of the connecting rod 206a. This fixes the connecting rod 206a and ensures the stability of the protective net 206c after installation.

[0050] When the limiting rod 205d-1 is inserted into the limiting groove 206b, it will cause the first ratchet 205d-2 and the second ratchet 205d-3 to press against the ratchet plate 206e-2 in sequence. Under the action of the pressing force, the ratchet plate 206e-2, in conjunction with the elasticity of the return spring 206e-5, will continuously slide back and forth, and finally make the ratchet plate 206e-2 and the second ratchet 205d-3 complete the engagement. At this time, through the engagement of the ratchet plate 206e-2 and the second ratchet 205d-3, the turntable 205c cannot rotate in the opposite direction. This ensures that after the protective net 206c is installed, when personnel walk on the pedal 201, the protective net 206c will not be loosened, thus ensuring the safety of the staff. Moreover, the installation of the protective net 206c can be completed quickly without tools.

[0051] Because the first ratchet 205d-2 and the second ratchet 205d-3 are excessively raised through a large helical tooth, the ratchet plate 206e-2 and the second ratchet 205d-3 will engage, causing the slide bar 206e-1 to shift upwards as a whole. At this time, when it is necessary to inspect the firmness of the installation of the protective net 206c, the staff can judge the firmness of the installation of the protective net 206c by observing the height difference between the handle 206e-3 at the top of the slide bar 206e-1 and the short bar 206f-2. Compared with the method of using tools to inspect in sequence, this is more convenient and safer.

[0052] In summary, when installing and maintaining the protective net 206c, the installation can be completed quickly without the use of tools. Compared with the method of using tools to perform maintenance in sequence, the stability of the protective net 206c installation can be judged directly by observing the height difference between the top handle 206e-3 of the slide rod 206e-1 and the short rod 206f-2. This greatly improves the convenience of installation and eliminates the need to carry tools for high-altitude operations, reducing the risk of falling objects from heights.

[0053] Example 2

[0054] Reference Figures 4-6 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the re-inspection component 206d includes a connecting block 206d-1 fixedly connected to the outside of the connecting rod 206a, and a rotating shaft 206d-2 rotatably connected to the inside of the connecting block 206d-1.

[0055] The rotating shaft 206d-2 is equipped with a torsion spring inside.

[0056] Furthermore, the inspection component 206d also includes a connecting rod 206d-3 fixedly connected to the outside of the rotating shaft 206d-2, a locking block 206d-4 provided at one end of the connecting rod 206d-3, and a pressure plate 206d-5 fixedly connected to the outside of the rotating shaft 206d-2;

[0057] The 206d-4 card is made of rubber.

[0058] In use, when the first ratchet 205d-2 presses against the ratchet plate 206e-2, the ratchet plate 206e-2 will continuously slide back and forth under the interaction of the pressing force of the first ratchet 205d-2 and the elasticity of the return spring 206e-5. This will drive the slide rod 206e-1 and the fixing plate 206e-4 on the outside of the slide rod 206e-1 to slide back and forth. The sliding fixing plate 206e-4 will continuously push the pressure plate 206d-5, which, in conjunction with the torsion spring inside the rotating shaft 206d-2, will realize the reciprocating rotation of the rotating shaft 206d-2. The rotating shaft 206d-2 will drive the locking block 206d-4 at one end of the connecting rod 206d-3 to continuously insert into the buckle 204, and make a sound when the locking block 206d-4 is impacted. When the first ratchet 205d-2 is fully engaged with the ratchet plate 206e-2, the first ratchet 205d-2 does not squeeze the ratchet plate 206e-2. At this time, the locking block 206d-4 returns to its initial state and is not inserted into the buckle 204. When the operator is installing, he can judge the installation state of the equipment by the sound of the locking block 206d-4 impacting the buckle 204.

[0059] When the first ratchet 205d-2 is adjusted to engage with the second ratchet 205d-3 and the ratchet plate 206e-2 under the action of the large helical teeth, the lifting of the second ratchet 205d-3 will cause the ratchet plate 206e-2 to be constantly compressed, thus keeping the locking block 206d-4 fully inserted into the buckle 204. As the second ratchet 205d-3 continuously compresses the ratchet plate 206e-2, the pressure plate 206d-5 will be pushed again by the fixing plate 206e-4, thereby driving the rotating shaft 206d-2 to continue rotating. At this time, under the action of the compressive force, the locking block 206d- 4. Deformation and bending occur until the second ratchet 205d-3 is fully engaged with the ratchet plate 206e-2. After this, the locking block 206d-4 is inserted into the buckle 204. When the second ratchet 205d-3 slides and continues to press against the ratchet plate 206e-2, the locking block 206d-4 will deform. As a result, the operator needs to increase the force of rotating the turntable 205c to drive the limit rod 205d-1 to slide inside the limit groove 206b. Thus, when installing, the operator can determine the current installation state of the equipment by the force of rotating the turntable 205c.

[0060] When it is necessary to inspect the protective net 206c, the firmness of the protective net 206c can also be judged by observing the connection status between the clip 206d-4 and the buckle 204.

[0061] In summary, when installing and maintaining the protective net 206c, the installation can be completed quickly without the use of tools. Compared with the method of using tools to perform maintenance step by step, the stability of the protective net 206c can be judged directly by observing the height difference between the top handle 206e-3 of the sliding rod 206e-1 and the short rod 206f-2, as well as the connection status between the locking block 206d-4 and the buckle 204. This greatly improves the convenience of installation and eliminates the need to carry tools for high-altitude operations, reducing the risk of falling objects from heights.

[0062] Example 3

[0063] Reference Figure 7 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the auxiliary component 206f includes an annular frame 206f-1 fixedly connected to the top end of the connecting rod 206a, and a short rod 206f-2 fixedly connected to the top end of the annular frame 206f-1.

[0064] When using the protective net 206c, pull the handle 206e-3 and rotate it. Finally, place the handle 206e-3 above the short rod 206f-2. At this time, the handle 206e-3 can drive the ratchet plate 206e-2 at the bottom of the slide rod 206e-1 to rise and separate the ratchet plate 206e-2 from the second ratchet tooth 205d-3. Then, reverse the turntable 205c to make the limiting rod 205d-1 slide out from the inside of the limiting groove 206b. Finally, remove the connecting rod 206a from the inside of the mounting sleeve 202 to complete the removal of the protective net 206c.

[0065] In summary, when disassembling the protective net 206c, simply pull and turn the handle 206e-3 and then reverse the turntable 205c. This is not only convenient to operate, but also eliminates the need for tools and the need to collect the disassembled screws compared to the connection method using transmission screws, greatly improving the practicality of the equipment.

[0066] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0067] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A construction platform for tying reinforcing bars in hollow piers, characterized in that: include, The support mechanism (100) includes a support frame (101), a vertical rod (102) fixedly connected to the outside of the support frame (101), and a horizontal rod (103) disposed on the outside of the vertical rod (102). The bottom end of the horizontal rod (103) is fixedly connected to a support rod (104), the top end of the horizontal rod (103) is fixedly connected to a first protrusion (105), and the top end of the horizontal rod (103) is fixedly connected to a second protrusion (106). The first protrusion (105) and the second protrusion (106) form a mounting cavity; The protective mechanism (200) includes a pedal (201) disposed inside the mounting cavity, a mounting sleeve (202) fixedly connected to the top of the pedal (201), and a bottom sleeve (203) fixedly connected to the bottom of the pedal (201). A buckle (204) is fixedly connected to the outside of the mounting sleeve (202). An operating component (205) is provided at the bottom of the pedal (201). A protective component (206) is adapted to be installed inside the mounting sleeve (202). The operating component (205) includes a mounting base (205a) fixedly connected to the bottom end of the pedal (201), a double-ended lead screw (205b) rotatably connected to the inner side of the mounting base (205a), and a turntable (205c) fixedly connected to the outer side of the double-ended lead screw (205b). Limiting components (205d) are provided at both ends of the double-ended lead screw (205b). The limiting assembly (205d) includes a limiting rod (205d-1) adapted to the double-ended lead screw (205b), a first ratchet (205d-2) fixedly connected to the outside of the limiting rod (205d-1), and a second ratchet (205d-3) fixedly connected to the outside of the limiting rod (205d-1). The top end of the limiting rod (205d-1) is slidably connected to the bottom end of the pedal (201), and the first ratchet (205d-2) and the second ratchet (205d-3) are designed to be misaligned. The protective component (206) includes a connecting rod (206a) inserted into the mounting sleeve (202), a limiting groove (206b) opened on the outside of the connecting rod (206a), and a protective net (206c) fixedly connected to the outside of the connecting rod (206a). The connecting rod (206a) is provided with a re-inspection component (206d) on its outer side, a locking component (206e) is provided inside the connecting rod (206a), and an auxiliary component (206f) is provided at the top of the connecting rod (206a).

2. The construction platform for tying reinforcing bars in hollow piers according to claim 1, characterized in that: The crossbar (103) is fixedly connected to one end of the support rod (104) by a mounting plate (107), and the outer side of the mounting plate (107) is threaded with a bolt (108), through which the crossbar (103) and the vertical rod (102) are connected.

3. The construction platform for tying reinforcing bars in hollow piers according to claim 2, characterized in that: The re-inspection component (206d) includes a connecting block (206d-1) fixedly connected to the outside of the connecting rod (206a), and a rotating shaft (206d-2) rotatably connected to the inside of the connecting block (206d-1). The rotating shaft (206d-2) is equipped with a torsion spring inside.

4. The construction platform for tying reinforcing bars in hollow piers according to claim 3, characterized in that: The re-inspection assembly (206d) also includes a connecting rod (206d-3) fixedly connected to the outside of the rotating shaft (206d-2), a locking block (206d-4) provided at one end of the connecting rod (206d-3), and a pressure plate (206d-5) fixedly connected to the outside of the rotating shaft (206d-2). The card block (206d-4) is made of rubber.

5. The construction platform for tying reinforcing bars in hollow piers according to claim 4, characterized in that: The locking assembly (206e) includes a slide bar (206e-1) slidably connected inside the connecting rod (206a), a ratchet plate (206e-2) fixedly connected to the bottom end of the slide bar (206e-1), and a handle (206e-3) rotatably connected to the top end of the slide bar (206e-1).

6. The construction platform for tying reinforcing bars in hollow piers according to claim 5, characterized in that: The locking assembly (206e) further includes a fixing plate (206e-4) fixedly connected to the outside of the slide rod (206e-1), and a return spring (206e-5) sleeved on the outside of the slide rod (206e-1). The return spring (206e-5) is disposed between the fixing plate (206e-4) and the bottom end of the connecting rod (206a).

7. The construction platform for tying reinforcing bars in hollow piers according to any one of claims 3 to 6, characterized in that: The auxiliary component (206f) includes an annular frame (206f-1) fixedly connected to the top of the connecting rod (206a), and a short rod (206f-2) fixedly connected to the top of the annular frame (206f-1).

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