CN114809647A - Column reinforcement fixing device and construction method thereof - Google Patents
Column reinforcement fixing device and construction method thereof Download PDFInfo
- Publication number
- CN114809647A CN114809647A CN202210508050.5A CN202210508050A CN114809647A CN 114809647 A CN114809647 A CN 114809647A CN 202210508050 A CN202210508050 A CN 202210508050A CN 114809647 A CN114809647 A CN 114809647A
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- Prior art keywords
- column
- fixing device
- circle
- splicing frame
- vertical
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- 238000010276 construction Methods 0.000 title claims abstract description 20
- 230000002787 reinforcement Effects 0.000 title abstract description 36
- 230000000712 assembly Effects 0.000 claims abstract description 20
- 238000000429 assembly Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 210000003205 muscle Anatomy 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
- E04G21/185—Means for positioning building parts or elements for anchoring elements or elements to be incorporated in the structure
Abstract
The invention discloses a column reinforcement fixing device and a construction method thereof, wherein the column reinforcement fixing device comprises the following steps: the splicing frame is used for being supported on the inner side of a circle of vertical column ribs and comprises a plurality of joint assemblies and a plurality of connecting pieces, the joint assemblies are arranged at intervals along the circumferential direction of a column, and the connecting pieces are detachably connected between every two adjacent joint assemblies; a plurality of spacing subassemblies, spacing subassembly detachably install in the connecting piece is a plurality of spacing subassembly is followed the circumference direction setting of post is a plurality of spacing subassembly the position with the position one-to-one of the vertical post muscle of round, keeping away from of spacing subassembly two grip blocks, two are installed adjustably to one side position of concatenation frame form the centre gripping space that is used for a centre gripping vertical post muscle between the grip block. The invention solves the problem that the vertical steel bars of the column steel reinforcement cage are easy to deviate and skew in the existing construction method of the column steel reinforcement cage.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a column reinforcement fixing device and a construction method thereof.
Background
In a building project, the number of structural columns of a common frame structure is large, and the construction period is short. The construction of column reinforcements is the most common and important construction process in frame structures. In the construction process of the column reinforcing steel bars, the positioning, the spacing, the verticality and the like of the column reinforcing steel bars are strictly controlled so as to improve the forming quality of the column reinforcing steel bar cage.
The construction scheme of the existing column reinforcement cage generally comprises the steps of column size paying-off, reinforcement raw material processing, reinforcement binding and connecting, stirrup binding, reinforcement straightening and finally template sealing. The existing column reinforcement cage construction scheme has the problems that the vertical reinforcement interval of the reinforcement cage cannot be accurately controlled, and the vertical reinforcements are easy to deviate and skew.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, a column reinforcement fixing device and a construction method thereof are provided so as to solve the problem that the vertical reinforcements of a column reinforcement cage are easy to deviate and skew in the conventional column reinforcement cage construction method.
In order to achieve the above object, there is provided a column bar fixing device including:
the splicing frame is used for being supported on the inner side of a circle of vertical column ribs and comprises a plurality of joint assemblies and a plurality of connecting pieces, the joint assemblies are arranged at intervals along the circumferential direction of a column, and the connecting pieces are detachably connected between every two adjacent joint assemblies;
a plurality of spacing subassemblies, spacing subassembly detachably install in the connecting piece is a plurality of spacing subassembly is followed the circumference direction setting of post is a plurality of spacing subassembly the position with the position one-to-one of the vertical post muscle of round, keeping away from of spacing subassembly two grip blocks, two are installed adjustably to one side position of concatenation frame form the centre gripping space that is used for a centre gripping vertical post muscle between the grip block.
Further, spacing subassembly includes:
the clamping plate is arranged at an orifice of the strip-shaped hole close to the first side of the substrate and abutted against the first side of the substrate;
the buckle piece is used for buckling the splicing frame and is arranged on the second side of the substrate; and
the two sliding rods are slidably arranged in the strip-shaped holes, one ends of the sliding rods are connected to the clamping plate, and the other ends of the sliding rods are provided with fastening pieces used for locking the substrate.
Furthermore, the buckle piece is an elastic buckle, a through hole for embedding the connecting piece is formed in the elastic buckle, and one side of the through hole, which is far away from the substrate, is provided with a notch.
Furthermore, an external thread is formed at the other end of the sliding rod, the fastening piece is a nut, and the nut is screwed at the other end of the sliding rod and presses against the second side of the substrate.
Furthermore, the joint component comprises two straight rod pieces, one ends of the two straight rod pieces are connected together in a cross mode, the other ends of the straight rod pieces are connected to the connecting piece, the two straight rod pieces are sleeves and/or screw rods, the connecting piece is provided with a socket end and an inserting end which are opposite, the socket end is provided with a threaded hole screwed to the screw rod of the joint component, and the inserting end is detachably inserted into the sleeves of the joint component.
Furthermore, the inserting end and the sleeve are respectively provided with a lock hole, and a pin shaft is inserted into the lock hole of the inserting end and the lock hole of the sleeve.
Furthermore, the splicing frame is rectangular, the two straight rod pieces of the joint assembly are vertically arranged, and one end of each straight rod piece is clamped on one vertical column rib at the corner of the column.
The invention provides a construction method of a column reinforcement fixing device, which comprises the following steps:
splicing a splicing frame, and arranging the splicing frame at the inner side of a circle of vertical column ribs, so that the splicing frame is supported at the inner side of the circle of vertical column ribs;
installing a plurality of limiting assemblies on the splicing frame based on the position of each reinforcing steel bar of the circle of vertical column bars, so that the positions of the limiting assemblies correspond to the positions of each reinforcing steel bar of the circle of vertical column bars one by one;
the distance between the two clamping plates of the limiting assembly is adjusted, so that the distance between the two clamping plates is adaptive to the outer diameter of the steel bar, each steel bar is embedded in the clamping space between the two clamping plates, and the relative position of each steel bar of the circle of vertical column bars is locked.
The column reinforcement fixing device has the beneficial effects that the column reinforcement fixing device is used for controlling the size of a column, the accuracy of the size of the column is ensured, the spacing and the verticality of the vertical column reinforcements of the column are controlled through the limiting assembly, so that a column reinforcement cage has better forming quality, in addition, the vertical column reinforcements are fixed in the clamping space through the limiting assembly, so that the vertical column reinforcements are firmer and can not deviate, column stirrups are easier to bind, and the forming quality of the column is finally improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural view of a stud fixing device according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of a stud fixing device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a splicing frame according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a joint assembly according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a joint assembly according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of a joint assembly according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a connector according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a limiting assembly according to an embodiment of the present invention.
Fig. 9 is a top view of a stop assembly according to an embodiment of the present invention.
Fig. 10 is a schematic view of a use state of the stud fixing device according to the embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 10, the present invention provides a stud fixing device, including: a splicing frame 1 and a plurality of limiting assemblies 2.
The splice frame 1 includes a plurality of connector assemblies 11 and a plurality of connectors 12. A plurality of joint assemblies 11 are provided at intervals in the circumferential direction of the column. The connecting member 12 is detachably connected between two adjacent joint assemblies 11. The splicing frame 1 is used for supporting the inner side of a circle of vertical column ribs 3.
In this embodiment, the cross-section of the post is rectangular. The number of joint components is four, and each joint component is arranged at four corners of the column.
The spacing assembly 2 is detachably mounted to the connecting member 12. A plurality of spacing components 2 are arranged along the circumferential direction of the column. The positions of the limiting assemblies 2 correspond to the positions of each vertical main rib of the circle of vertical column rib 3 one by one. Two clamping plates 23 are adjustably arranged on one side of the limiting assembly 2 far away from the splicing frame 1. A clamping space for clamping a vertical column rib 3 is formed between the two clamping plates 23.
Referring to fig. 10, after the splicing frame is assembled, the splicing frame is horizontally disposed at the inner side of the circle of vertical column ribs, so that the splicing frame is supported at the inner side of the circle of vertical column ribs. And embedding each vertical column rib of the circle of vertical column ribs in the clamping space of each limiting assembly in a one-to-one correspondence manner, and further embedding the circle of vertical column ribs of the column.
The column reinforcement fixing device is used for controlling the size of a column, the accuracy of the size of the column is guaranteed, the spacing and the verticality of vertical column reinforcements of the column are controlled through the limiting assembly, the column reinforcement cage has better forming quality, in addition, the vertical column reinforcements are fixed in the clamping space through the limiting assembly, the vertical column reinforcements are firmer and cannot deviate, column stirrups are easier to bind, and therefore the forming quality of the column is finally improved.
In this embodiment, the joint assembly 11 includes two straight rods, which are the sleeve 111 and/or the screw 112.
Specifically, referring to fig. 4, a connector assembly is shown that includes two sleeves 111. The two hollow sleeves are connected together in a crossed manner, the length of each sleeve is 100mm, the inner diameter of each sleeve is 14mm, and the wall thickness of each sleeve is 3 mm. Two lockholes with the diameter of 10mm are respectively arranged at the upper part and the lower part of the sleeve.
Referring to fig. 5, a connector assembly is shown which includes a sleeve 11 and a threaded rod 112. The screw length is 700 mm. The sleeve is a hollow sleeve with the length of 100mm, the inner diameter of 14mm and the wall thickness of 3mm, and the upper part and the lower part of the hollow sleeve are respectively provided with two lock holes with the diameter of 10 mm.
Referring to fig. 4, a connector assembly is shown that includes two threaded rods 112. Both screws were 700mm long screws.
One ends of the two straight rod pieces are connected together in a crossing manner, and the other ends of the two straight rod pieces are respectively connected with the connecting piece 12. The connector 12 has opposite female and male ends. The socket end of the connecting piece 12 is provided with a threaded hole screwed with the screw rod of the joint component 11, and the inserting end of the connecting piece 12 is detachably inserted into the sleeve of the joint component 11.
In this embodiment, and referring to FIG. 7, the connection piece is a straight threaded socket, and the outside diameter of the spigot end of the connection piece is smaller than the outside diameter of the socket end of the connection piece. The outer diameter of the plugging end of the connecting piece is matched with the inner diameter of the sleeve of the joint component. The inserting end of the connecting piece and the sleeve of the joint component are respectively provided with a lock hole. And a pin shaft is inserted into the lock hole of the insertion end and the lock hole of the sleeve. In practical use, after the inserting end of the connecting piece is inserted into the sleeve of the joint component, the locking hole of the inserting end is aligned to the locking hole of the sleeve, and then the pin shaft is inserted into the locking hole of the inserting end and the locking hole of the sleeve.
The straight thread sleeve is 700mm long, a hollow rod piece (namely, the inserting end of the connecting piece) which is 100mm long and 14mm in diameter and used for connecting other components is fixed at one end of the straight thread sleeve, and locking holes with the diameter of 10mm are respectively arranged in the upper middle part and the lower middle part of the hollow rod piece.
In this embodiment, the splicing frame 1 is rectangular, the number of the joint assemblies and the number of the connecting pieces are four respectively, and the joint assemblies and the connecting pieces are alternately arranged. The two straight rod members of the joint assembly 11 are vertically arranged. One end of the two straight bars of each joint assembly is clamped to a vertical column rib 3 at the corner of the column.
In the connection mode of the joint components and the connecting piece, one end of the connecting piece is inserted into the sleeve of one joint component, the other end of the connecting piece is in threaded connection with the screw rod of the other joint component, and the size of the splicing frame can be adjusted through the threaded connection of the connecting piece and the screw rod of the joint components so as to be adapted to the construction of column reinforcement cages of different sizes.
As a preferred embodiment, referring to fig. 8 and 9, the spacing assembly 2 comprises: a base plate 21, a fastener 22 and two sliding rods.
In particular, with continued reference to fig. 8 and 9, the substrate 21 has a first side facing the splice frame 1 and a second side facing away from the splice frame 1. The base plate 21 is provided with a strip-shaped hole arranged in the horizontal direction. The strip-shaped holes penetrate the first and second sides of the substrate 21. The clamping plate 23 is disposed at the aperture of the strip-shaped hole close to the first side of the substrate 21 and abuts against the first side of the substrate 21.
The latch 22 is mounted on a second side of the base plate 21. The fastener 22 is used for being buckled with the splicing frame 1.
The slide bar is arranged in the strip-shaped hole in a sliding way. One end of the slide bar is connected to the clamping plate 23, and the other end of the slide bar is provided with a fastening piece for locking the substrate 21.
In a preferred embodiment, the latch 22 is a resilient latch. The elastic buckle is internally provided with a through hole for embedding the connecting piece 12. One side of the through hole, which is far away from the substrate 21, is provided with a notch 220. When the buckle piece is buckled on the splicing frame, the opening of the buckle piece is aligned to the connecting piece, or the sleeve of the connector assembly, or the screw rod of the connector assembly, so that the connecting piece, or the sleeve of the connector assembly, or the screw rod of the connector assembly is extruded into the through hole of the buckle piece through the opening.
In this embodiment, the other end of the slide bar is formed with an external thread. The fastening piece is a nut. The nut is screwed on the other end of the sliding rod and is pressed against the second side of the base plate 21.
The invention provides a construction method of a column reinforcement fixing device, which comprises the following steps:
s1: splicing frame 1 is spliced, and splicing frame 1 is arranged on the inner side of a circle of vertical column ribs 3, so that splicing frame 1 is supported on the inner side of a circle of vertical column ribs 3.
S2: based on the position of each reinforcing bar of vertical post muscle 3 of round, in a plurality of spacing subassemblies 2 of 1 installation of concatenation frame for the position one-to-one of each reinforcing bar of the position of a plurality of spacing subassemblies 2 and vertical post muscle 3 of round.
S3: will adjust the distance between two grip blocks 23 of spacing subassembly 2 for the distance adaptation in the external diameter of reinforcing bar between two grip blocks 23, and inlay each reinforcing bar and locate in the centre gripping space between two grip blocks 23, and then the relative position of each reinforcing bar of the vertical post muscle 3 of locking round.
The construction method of the column reinforcement fixing device can effectively overcome the defects of the traditional column reinforcement construction method, is novel and reasonable in design, simple and reliable in manufacture, economical and practical, simple and convenient in field operation, can ensure the forming quality of the column, can effectively improve the working efficiency, saves labor force, and also conforms to the characteristics of green energy-saving construction.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A stud fixation device, comprising:
the splicing frame is used for being supported on the inner side of a circle of vertical column ribs and comprises a plurality of joint assemblies and a plurality of connecting pieces, the joint assemblies are arranged at intervals along the circumferential direction of a column, and the connecting pieces are detachably connected between every two adjacent joint assemblies;
a plurality of spacing subassemblies, spacing subassembly detachably install in the connecting piece is a plurality of spacing subassembly is followed the circumference direction setting of post is a plurality of spacing subassembly the position with the position one-to-one of the vertical post muscle of round, keeping away from of spacing subassembly two grip blocks, two are installed adjustably to one side position of concatenation frame form the centre gripping space that is used for a centre gripping vertical post muscle between the grip block.
2. The stud fixation device of claim 1, wherein the stop assembly comprises:
the clamping plate is arranged at an orifice of the strip-shaped hole close to the first side of the substrate and abutted against the first side of the substrate;
the buckle piece is used for buckling the splicing frame and is arranged on the second side of the substrate; and
the two sliding rods are slidably arranged in the strip-shaped holes, one ends of the sliding rods are connected to the clamping plate, and the other ends of the sliding rods are provided with fastening pieces used for locking the substrate.
3. The stud fixing device of claim 2, wherein the fastener is an elastic fastener, a through hole for inserting a connector is formed inside the elastic fastener, and a notch is formed on one side of the through hole, which is far away from the base plate.
4. The stud fixing device of claim 2, wherein the other end of the sliding rod is formed with an external thread, the fastening member is a nut, and the nut is screwed on the other end of the sliding rod and presses against the second side of the base plate.
5. The stud fixing device of claim 1, wherein the joint assembly comprises two straight rod members, one ends of the two straight rod members are connected together in a crossing manner, the other ends of the straight rod members are connected to the connecting member, the two straight rod members are sleeves and/or screws, the connecting member has a socket end and a plug end which are opposite, the socket end is provided with a threaded hole which is screwed with the screw of the joint assembly, and the plug end is detachably inserted into the sleeve of the joint assembly.
6. The column bar fixing device according to claim 5, wherein the inserting end and the sleeve are respectively provided with a lock hole, and a pin shaft is inserted into the lock hole of the inserting end and the lock hole of the sleeve.
7. The column bar fixing device according to claim 5, wherein the splicing frame is rectangular, the two straight rod members of the joint assembly are vertically arranged, and one end of each of the two straight rod members is clamped to one of the vertical column bars at the corner of the column.
8. A construction method of a stud fixing device according to any one of claims 1 to 7, comprising the steps of:
splicing a splicing frame, and arranging the splicing frame at the inner side of a circle of vertical column ribs, so that the splicing frame is supported at the inner side of the circle of vertical column ribs;
installing a plurality of limiting assemblies on the splicing frame based on the position of each reinforcing steel bar of the circle of vertical column bars, so that the positions of the limiting assemblies correspond to the positions of each reinforcing steel bar of the circle of vertical column bars one by one;
the distance between the two clamping plates of the limiting assembly is adjusted, so that the distance between the two clamping plates is adaptive to the outer diameter of the steel bar, each steel bar is embedded in the clamping space between the two clamping plates, and the relative position of each steel bar of the circle of vertical column bars is locked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508050.5A CN114809647A (en) | 2022-05-10 | 2022-05-10 | Column reinforcement fixing device and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508050.5A CN114809647A (en) | 2022-05-10 | 2022-05-10 | Column reinforcement fixing device and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114809647A true CN114809647A (en) | 2022-07-29 |
Family
ID=82513506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210508050.5A Pending CN114809647A (en) | 2022-05-10 | 2022-05-10 | Column reinforcement fixing device and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114809647A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH464484A (en) * | 1964-07-02 | 1968-10-31 | Glatt Reinhold | Holder for fixing reinforcement parts |
| GB1574639A (en) * | 1976-10-18 | 1980-09-10 | Rapid Metal Developments Austr | Reinforcement spacer |
| CN102677825A (en) * | 2006-11-21 | 2012-09-19 | 乔恩·R·科迪 | Clip string |
| CN204163290U (en) * | 2014-10-28 | 2015-02-18 | 中冶建工集团有限公司 | Sleeve type shear wall protective layer thickness control device |
| CN212001935U (en) * | 2020-03-18 | 2020-11-24 | 中国建筑第八工程局有限公司 | Adjustable column longitudinal rib positioning device |
-
2022
- 2022-05-10 CN CN202210508050.5A patent/CN114809647A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH464484A (en) * | 1964-07-02 | 1968-10-31 | Glatt Reinhold | Holder for fixing reinforcement parts |
| GB1574639A (en) * | 1976-10-18 | 1980-09-10 | Rapid Metal Developments Austr | Reinforcement spacer |
| CN102677825A (en) * | 2006-11-21 | 2012-09-19 | 乔恩·R·科迪 | Clip string |
| CN204163290U (en) * | 2014-10-28 | 2015-02-18 | 中冶建工集团有限公司 | Sleeve type shear wall protective layer thickness control device |
| CN212001935U (en) * | 2020-03-18 | 2020-11-24 | 中国建筑第八工程局有限公司 | Adjustable column longitudinal rib positioning device |
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