CN114705107B - Be used for stake foundation pile diameter and straightness detecting instrument that hangs down - Google Patents
Be used for stake foundation pile diameter and straightness detecting instrument that hangs down Download PDFInfo
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- CN114705107B CN114705107B CN202210072476.0A CN202210072476A CN114705107B CN 114705107 B CN114705107 B CN 114705107B CN 202210072476 A CN202210072476 A CN 202210072476A CN 114705107 B CN114705107 B CN 114705107B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/10—Plumb lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/02—Details
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention belongs to the technical field of constructional engineering, and discloses a pile diameter and verticality detecting instrument for a pile foundation. The detecting instrument comprises a vertical main rod body, wherein the main rod body is axially provided with height scales, and a fixed ring is sleeved on the main rod body in a sliding way; at least three equal-length support rods are hinged on the same circumference of the fixed ring, wherein two support rods are respectively positioned at two ends of the same diameter of the circumference and are measuring rods, soft shielding bodies are arranged on all support rods together, and the soft shielding bodies are transparent; the lower end of the support rod body is hinged with a holding block; the winding body is arranged on the main rod body, a hanging rope with length scales is wound on the winding body, the lower end of the hanging rope is connected with an electronic hanging scale, and the lower end of the electronic hanging scale is connected with a hanging sliding block; the inner side of the enclasping block corresponding to the measuring rod is provided with a telescopic slideway, and the hanging sliding block is positioned in the slideway. The invention solves the technical problems of inconvenient detection of pile diameter and perpendicularity and low precision of the pile foundation in the prior art.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a pile diameter and verticality detecting instrument for a pile foundation.
Background
With the development of urban construction, various buildings are pulled up, and a reasonable foundation is needed for any building to ensure the safe use of the building. The most common of these is pile foundations, called pile foundations for short. The pile foundation structure mainly comprises a plurality of foundation piles and a bearing platform for connecting the tops of the foundation piles.
For foundation piles, the pile diameter and verticality of the foundation piles are strictly controlled: for the pile diameter, if the pile diameter is too small, the strength may be insufficient, and if the pile diameter is too large, the cost may be increased; if the perpendicularity tolerance is large, the pile foundation may not function as a safety support table. Therefore, in the construction process, the pile diameter and the perpendicularity must be measured, and the pile diameter and the perpendicularity of the pile foundation are guaranteed to be detected within the error range required in the design drawing.
In the prior art, the pile diameter of the pile foundation and the perpendicularity of the pile foundation are detected by different instruments respectively, for example, the pile diameter of the pile foundation is detected by measuring tape directly, the perpendicularity of the pile foundation is detected by hanging plumb, and the like. Firstly, the detection mode in the prior art is inconvenient and needs to be operated repeatedly; secondly, the defect of low precision exists, for example, deviation can be generated between the measuring tape and the diameter of a pile foundation during measuring, and the measuring tape is directly exposed during plumb hanging measurement and is easily influenced by external factors such as wind power and the like.
Disclosure of Invention
The invention aims to provide a pile foundation diameter and perpendicularity detecting instrument for solving the technical problems that in the prior art, the pile foundation diameter and perpendicularity are inconvenient to detect and the accuracy is low.
In order to achieve the above purpose, the invention provides a technical scheme that the instrument for detecting the diameter and the perpendicularity of a pile foundation comprises a vertical main rod body, wherein the main rod body is provided with height scales along the axial direction, a fixed ring is sleeved on the main rod body in a sliding way, and a first locking piece for locking the sliding of the fixed ring is arranged on the fixed ring; at least three equal-length support rods are hinged on the same circumference of the fixed ring, wherein two support rods are respectively positioned at two ends of the same diameter of the circumference and are measuring rods, all support rods are jointly provided with a soft shielding body which is umbrella-shaped and surrounds the main rod body, and the soft shielding body is transparent; the lower end of the support rod body is hinged with a holding block;
the winding body is arranged on the main rod body, a hanging rope with length scales is wound on the winding body, the lower end of the hanging rope is connected with an electronic hanging scale, and the lower end of the electronic hanging scale is connected with a hanging sliding block; the inside of the enclasping block corresponding to the measuring rod is provided with a telescopic slideway, two ends of the slideway are respectively positioned at the same height of the two enclasping blocks, the hanging sliding block is positioned in the slideway, the upper side and the lower side of the slideway are provided with parallel limiting strips, and the hanging sliding block is contacted with the two limiting strips.
The technical principle of the technical scheme is as follows:
the main rod body is a main support body and is also a positioning center of the whole detection instrument, and the main rod body, the fixing ring, the support rod body and the soft shielding body jointly form a shape similar to an umbrella, the umbrella can be folded by sliding the fixing ring upwards, and the umbrella can be unfolded by sliding the fixing ring downwards. When pile foundation measurement is carried out, the umbrella is supported to different degrees, the umbrella can adapt to pile foundations with different diameters, and when the soft shielding body is fully supported, the maximum diameter can be measured.
Diameter measurement: the umbrella is unfolded, each enclasping block is positioned on the outer side of the pile foundation and is clung to the pile foundation, the clung heights of the enclasping blocks and the pile foundation are equal, the radius of the pile foundation can be calculated according to the Pythagorean theorem through the length of the support rod body and the height scale on the main rod body corresponding to the fixing ring, and then the diameter of the pile foundation is calculated.
When pile foundation is inclined, the slide way is inclined, the hanging sliding block can slide downwards along the inclined slide way, and the winding body can wind and unwind the hanging rope, so that the position of the hanging sliding block is controlled. And when the hanging sliding blocks are positioned at different positions of the slideway, the stress of the electronic hanging scale is different. When the hanging sliding block is positioned at the center of the slideway, namely the center corresponding to the pile foundation, the stress of the electronic hanging scale is larger than the gravity of the hanging sliding block; when the hanging sliding block slides to a position which is naturally vertical to the ground downwards, the stress of the electronic hanging scale is equal to the gravity of the hanging sliding block; when the hanging slide block continuously slides downwards, the stress of the electronic hanging scale is smaller than the gravity of the hanging slide block.
Verticality measurement: and calibrating the detecting instrument before measurement, so that when the hanging slide block is positioned in the center of the slideway, the stress of the electronic hanging scale is equal to the gravity of the hanging slide block. During measurement, if the stress of the electronic hanging scale is larger than the gravity of the hanging sliding block, the pile foundation to be measured can be judged to be inclined, and along with the slow extension of the hanging rope, the stress of the electronic hanging scale can be gradually changed until the stress of the electronic hanging scale is equal to the gravity of the hanging sliding block, the hanging rope is stopped from being put down, and the angle of pile foundation deviation can be calculated according to the initial scale of the hanging rope and the scale at the moment.
It is noted that in the scheme, the length of the support rod body and the gravity of the hanging sliding block are fixed and are known values in advance; the height scale on the main rod body represents the distance between the scale and the center of the connecting line of the bottom ends of the two measuring rods, and the value can be obtained by conversion in advance; the length scale on the hanging rope refers to the length of the free swinging part of the hanging rope, and the value can be converted in advance.
The technical scheme has the technical effects that:
1. after the instrument is installed on the pile foundation, the diameter and the perpendicularity of the pile can be measured, and the instrument does not need to be replaced to measure different parameters, so that the pile foundation is more convenient to detect.
2. When the perpendicularity is detected, the hanging sliding block is positioned inside the soft shielding body, so that the influence of external factors such as wind power on the hanging sliding block is avoided, the soft shielding body is transparent, the reading of the electronic hanging scale is facilitated, and the condition of each part inside the soft shielding body is also facilitated to be observed.
3. When the instrument is installed, the enclasping block is required to be clung to the outer side of the pile foundation, and if the enclasping block cannot be clung to the outer side of the pile foundation, the deformation of the pile foundation can be judged, and the unclamped and regular cylinder is convenient to correct in time.
4. The slide both ends are located two and hug tightly the same altitude departments of piece respectively, hang the slider and be located the slide, slide upper and lower both sides are equipped with parallel spacing, hang slider and two spacing all contacts, and the purpose is in order to let hang the slider and slide along the slide, is equivalent to the diameter slip along the pile foundation to when guaranteeing to utilize the initial scale of hanging rope and the scale after the lengthening to calculate the departure angle, two numerical values represent a right angled triangle's perpendicular limit and hypotenuse respectively, be convenient for calculate.
Further, elastic ropes are arranged between the adjacent enclasping blocks.
The beneficial effects are that: when the detecting instrument is installed on the pile foundation, the elastic rope can wrap the pile foundation, so that the enclasping block is conveniently clung to the outer side of the pile foundation, and manual operation can be reduced.
Further, the inner side of the enclasping block is provided with a limiting block below the slideway, and all limiting blocks are positioned at the same height of the corresponding enclasping block.
The beneficial effects are that: when the detecting instrument is installed on the pile foundation, whether the heights of the enclasping blocks and the pile foundation are equal or not can be accurately and conveniently judged through the limiting block.
Further, the hanging rope is flat, a vertical, flat and through cavity is formed in the main rod body, the winding body is positioned at the top end of the main rod body, and the hanging rope penetrates through the cavity.
The beneficial effects are that: the flat cavity is used for limiting the flat hanging rope, so that the hanging rope is prevented from rotating and interweaving, the length of the hanging rope is prevented from being influenced, namely, the reading of length scales is influenced, the measuring accuracy is further influenced, the shaking time of the hanging rope can be reduced by the aid of the limiting, the hanging rope is enabled to be fast and stable, and the reading and the calculating are good.
Further, a second locking piece for locking the rolling body to rotate is arranged on the main rod body.
The beneficial effects are that: the winding body is locked to replace manual limitation of rotation of the winding body.
Further, hang the slider for cuboid form, hang the upper end of slider and be equipped with logical groove along the slide direction, hang the focus of slider and be located logical inslot portion, and focus department is equipped with the connector that is used for connecting the electron and hangs the balance.
The beneficial effects are that: the action point of the electronic hanging scale on the hanging sliding block is ensured to be positioned at the gravity center of the hanging sliding block, so that the measurement accuracy is ensured; the through groove can facilitate the free swing of the rope at the lower end of the electronic hanging scale, so that the influence of foreign objects on the stress of the electronic hanging scale is avoided; the rectangular shape can ensure sliding, and relative to the rolling sphere, the hanging rope is not easy to rotate and interweave, and the measurement accuracy is affected.
Further, flexible rules are arranged on two sides of the connecting body, and penetrate through the through grooves and the slide ways in sequence from two sides of the connecting body respectively and extend to the holding blocks.
The beneficial effects are that: the sum of readings of the flexible rule at two sides is the diameter, and the measurement accuracy can be verified through different numerical value obtaining modes, so that whether the detecting instrument is damaged or not is checked, and errors are caused, and the calibration of the calibration, such as whether the supporting rod body is bent or not, whether each scale is accurate or not, and the like. In addition, the difference between the readings of the flexible rule on two sides should be twice the length of the other vertical side of the right triangle (the initial scale and the scale after the length of the hanging rope represent the length of one vertical side and the length of the hypotenuse of the right triangle respectively), so that the inspection of the detecting instrument can be performed in various ways.
Further, one end of the slideway is hinged with the enclasping block, and the other end of the slideway is detachably connected with the enclasping block.
The beneficial effects are that: the folding and the storage of the whole detecting instrument are convenient.
Further, the main rod body is also provided with a diameter scale corresponding to the height scale.
The beneficial effects are that: the diameter numerical value calculation corresponding to different heights is realized, and the corresponding diameter scales are set, so that the actual use of the detecting instrument is facilitated.
Further, the number of the support rod bodies is four, and the four support rod bodies are uniformly distributed along the same circumference of the fixing ring.
The beneficial effects are that: the stability of the four uniformly distributed supporting rod bodies can be ensured, and the whole detection instrument is not too complex.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention for detecting an untilted pile foundation;
FIG. 2 is a schematic diagram of an embodiment of the present invention for detecting a sloped pile foundation;
FIG. 3 is a schematic cross-sectional view of a hanging slider in an embodiment of the present invention;
fig. 4 is a schematic top view of a hanging slider according to an embodiment of the present invention.
Detailed Description
Further details are provided below with reference to the specific embodiments.
It is to be understood that in the description of the embodiments, the terms "longitudinal," "transverse," "vertical," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operate in a particular orientation, and are not to be construed as limiting the invention.
Reference numerals in the drawings of the specification include: the device comprises a main rod body 1, a fixed ring 2, a supporting rod body 3, a hanging rope 4, an electronic hanging scale 5, a hanging sliding block 6, a winding body 7, an inserting block 8, a sliding groove 9, a sliding way 10, an elastic rope 11, a pile foundation 12, a second locking piece 13, a through groove 14 and a connecting body 15.
The embodiment of the detection instrument for pile diameter and verticality of the pile foundation comprises a vertical main rod body 1 as shown in fig. 1 and 2, and the vertical main rod body is used as a positioning center of the whole detection instrument. The main rod body 1 is provided with height scales along the axial direction thereof and pile foundation diameter scales corresponding to each height scale.
The main rod body 1 is sleeved with a fixed ring 2 in a sliding way, and the inner side of the fixed ring 2 is contacted with the main rod body 1, but can axially slide along the main rod body 1. The fixed ring 2 is provided with a first locking piece which is used for locking the fixed ring 2, preventing the fixed ring from sliding continuously and fixing the fixed ring on the fixed rod, and the first locking piece is a fastening bolt.
Four equal-length support rods 3 (only two support rods are shown in the figure) are hinged on the same circumference of the fixed ring 2, the four support rods 3 are uniformly distributed along the circumference, namely, every two support rods 3 are respectively positioned at two ends of the same diameter of the circumference, two support rods 3 positioned at two ends of the same diameter of the circumference are called measuring rods, soft shielding bodies (not shown in the figure) rotating like an umbrella are commonly arranged on the four support rods 3, the soft shielding bodies are transparent films, and the soft shielding bodies surround the main rod body 1 in the center, so that the main rod body 1, the fixed ring 2, the support rods 3 and the soft shielding bodies jointly form a shape similar to an umbrella. The same circumference in this embodiment is close to the main rod body 1, so that the upper end of the support rod body 3 is also as close to the main rod body 1 as possible, and thus, the calculation of the radius of the pile foundation according to the Pythagorean theorem is more accurate.
The lower extreme of every branch body 3 all articulates and has hugs the piece, and the shape, the size of every hug the piece are all unanimous. Elastic ropes 11 are connected between the adjacent enclasping blocks, so that a ring with a variable diameter is formed and used for enclasping the pile foundation to be tested, thereby realizing the installation of a detection instrument. The inner sides of the enclasping blocks corresponding to the two measuring rods are provided with telescopic slide ways 10, one end of each slide way 10 is hinged with one enclasping block through a hinge, the other end of each slide way 10 is detachably connected with the other enclasping block through a hook, and two ends of each slide way 10 are respectively positioned at the same height of the two enclasping blocks. The shape of the slide way 10 in this embodiment is similar to a telescopic square tube, the upper and lower sides of the square tube are hollowed out, and the hollowed-out shape is rectangular, wherein the remaining solid parts except the hollowed-out upper and lower sides form a limit bar, and the limit bars on the upper and lower sides are parallel. The telescopic implementation mode of the slide way 10 of this embodiment is the coincidence pull type, namely whole slide way 10 includes a plurality of slide way 10 festival in proper order along the axial, and this embodiment is 3 festival, is located slide way 10 festival front and back surface outsides in both sides and is equipped with spout 9, is located the slide way 10 festival front and back surface outsides in the centre and is equipped with insert 8, and insert 8 is located spout 9, and can slide in spout 9, and the inboard of 3 slide way 10 festival is located the coplanar to guarantee that the inboard plane length of slide way 10 equals with pile foundation diameter.
Limiting blocks are arranged below the slide ways 10 on the inner sides of the enclasping blocks, and all limiting blocks are located at the same height of the corresponding enclasping blocks.
The main rod body 1 is internally provided with a vertical, flat and through cavity, the top end of the main rod body 1 is rotationally connected with the winding body 7 and a second locking piece 13 for locking the winding body 7 to rotate, the winding body 7 is a winding roller, the second locking piece 13 is a stop clamp hinged on the main rod body 1, the stop clamp clamps the winding body 7, and the winding body 7 and the stop clamp are mutually restricted, so that the winding body 7 is prevented from continuing to rotate. The winding body 7 is wound with the hanging rope 4 with length scales, the hanging rope 4 is flat, the hanging rope 4 smoothly penetrates through the cavity, the electronic hanging scale 5 is connected to the lower end of the hanging rope, the display screen of the electronic hanging scale 5 is consistent with the flat surface of the hanging rope 4 in orientation, stability of the electronic hanging scale 5 is facilitated, and reading is facilitated. The lower extreme of electronic string balance 5 is connected with hangs slider 6, hangs slider 6 and is the lead block of cuboid form, hangs slider 6 and is located slide 10, and is located in the slide 10 festival in the middle, and at the in-process of whole detection, pile foundation impossible inclination is very big (too big, can discern inequality with naked eyes, needs to rectify to change), therefore hang slider 6 and only can slide in slide 10 festival in the middle, slide in same slide 10 festival and can guarantee to slide smoothly. The upper and lower sides of the hanging slide block 6 are respectively contacted with the limit strips at the upper and lower sides.
As shown in fig. 3 and 4, the upper end of the hanging slide block 6 is provided with a through groove 14 along the slideway direction, the gravity center of the hanging slide block 6 is positioned in the through groove 14, and a connecting body 15 for connecting the electronic hanging scale 5 is arranged at the gravity center, and the connecting body 15 is a connecting rod with two ends fixedly connected with two sides of the through groove 14 respectively. Flexible rules (not shown in the figure) are further connected to two sides of the connecting body 15, and the flexible rules respectively pass through the through groove 14 and the slide way 10 from two sides of the connecting body 15 in sequence and extend to the holding block.
The specific implementation process of this embodiment is as follows:
when the pile diameter and verticality of the pile foundation 12 are required to be measured, the detecting instrument is calibrated first, and when the hanging sliding block 6 is positioned at the center of the slideway 10, the reading of the electronic hanging scale 5 is equal to the gravity of the hanging sliding block 6. Then installing a detecting instrument, sliding the fixed ring 2 downwards to prop open the umbrella, sleeving an elastic ring consisting of the enclasping block and the elastic rope 11 on the outer side of the pile foundation 12, enabling the enclasping block to be clung to the outer side of the pile foundation 12, and enabling the limiting blocks to be clung to the upper surface of the pile foundation 12. If the enclasping block is difficult to cling to the outer side of the pile foundation 12, the deformation of the pile foundation 12 can be primarily judged, and the non-required and regular cylinder is convenient to correct in time.
Pile diameter measurement and calculation: the radius of the pile foundation 12 is calculated according to the Pythagorean theorem through the length of the support rod body 3 and the height scale on the main rod body 1 corresponding to the fixed ring 2, and the diameter of the pile foundation 12 is calculated; the flexible rule at the two sides of the hanging sliding block 6 can be straightened, and the diameter is obtained according to the sum of the readings of the flexible rule at the two sides. And the diameter difference measured by different methods can be compared to judge whether the detecting instrument is damaged or not and a large error occurs.
Verticality measurement and calculation: if the reading of the electronic hanging scale 5 is larger than the gravity of the hanging slide block 6, the tested pile foundation 12 can be judged to be inclined, and the reading of the electronic hanging scale 5 can be gradually changed along with the slow extension of the hanging rope 4 until the reading of the electronic hanging scale 5 is equal to the gravity of the hanging slide block 6, the hanging rope 4 is stopped from being put, and the deviation angle of the pile foundation 12 can be calculated according to the initial scale of the hanging rope 4 and the scale at the moment. The accuracy of the measurement of the detecting instrument can be checked according to the difference of readings of the flexible rule at the two sides and the initial scale of the hanging rope 4 at the moment.
It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention, and these should also be considered as the scope of the invention, which does not affect the effect of the invention and the utility of the patent.
Claims (10)
1. Be used for stake foundation pile diameter and straightness detecting instrument that hangs down, its characterized in that: the device comprises a vertical main rod body, wherein the main rod body is axially provided with height scales, a fixed ring is sleeved on the main rod body in a sliding manner, and a first locking piece for locking the fixed ring to slide is arranged on the fixed ring; at least three equal-length support rods are hinged on the same circumference of the fixed ring, wherein two support rods are respectively positioned at two ends of the same diameter of the circumference and are measuring rods, all support rods are jointly provided with a soft shielding body which is umbrella-shaped and surrounds the main rod body, and the soft shielding body is transparent; the lower end of the support rod body is hinged with a holding block;
the winding body is arranged on the main rod body, a hanging rope with length scales is wound on the winding body, the lower end of the hanging rope is connected with an electronic hanging scale, and the lower end of the electronic hanging scale is connected with a hanging sliding block; the inside of the enclasping block corresponding to the measuring rod is provided with a telescopic slideway, two ends of the slideway are respectively positioned at the same height of the two enclasping blocks, the hanging sliding block is positioned in the slideway, the upper side and the lower side of the slideway are provided with parallel limiting strips, and the hanging sliding block is contacted with the two limiting strips.
2. The instrument for detecting pile diameter and perpendicularity of a pile foundation according to claim 1, wherein: elastic ropes are arranged between the adjacent enclasping blocks.
3. The instrument for detecting pile diameter and perpendicularity of a pile foundation according to claim 1, wherein: limiting blocks are arranged below the slide ways on the inner sides of the enclasping blocks, and all limiting blocks are located at the same height of the corresponding enclasping blocks.
4. A pile foundation diameter and perpendicularity detecting instrument according to any one of claims 1-3, characterized in that: the vertical lifting rope is flat, a vertical, flat and through cavity is formed in the main rod body, the winding body is positioned at the top end of the main rod body, and the vertical lifting rope penetrates through the cavity.
5. The instrument for detecting pile diameter and perpendicularity of a pile foundation according to claim 4, wherein: the main rod body is provided with a second locking piece for locking the rolling body to rotate.
6. The instrument for detecting pile diameter and perpendicularity of a pile foundation according to claim 4, wherein: the hanging slide block is cuboid, the upper end of the hanging slide block is provided with a through groove along the direction of the slideway, the gravity center of the hanging slide block is positioned inside the through groove, and the gravity center is provided with a connector for connecting the electronic hanging scale.
7. The apparatus for measuring pile diameter and perpendicularity of pile foundation according to claim 6, wherein: flexible rules are arranged on two sides of the connecting body, and penetrate through the through grooves and the slide ways in sequence from two sides of the connecting body respectively and extend to the holding blocks.
8. A pile foundation diameter and perpendicularity detecting instrument according to any one of claims 5-7, characterized in that: one end of the slideway is hinged with the enclasping block, and the other end of the slideway is detachably connected with the enclasping block.
9. A pile foundation diameter and perpendicularity detecting instrument according to any one of claims 5-7, characterized in that: the main rod body is also provided with a diameter scale corresponding to the height scale.
10. A pile foundation diameter and perpendicularity detecting instrument according to any one of claims 5-7, characterized in that: the number of the support rod bodies is four, and the four support rod bodies are uniformly distributed along the same circumference of the fixing ring.
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