CN115045196A

CN115045196A - A operation platform for cylinder mound construction

Info

Publication number: CN115045196A
Application number: CN202210766147.6A
Authority: CN
Inventors: 梁时威
Original assignee: Kaiping Li Jian Scaffolding Co ltd
Current assignee: Kaiping Li Jian Scaffolding Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-09-13

Abstract

The invention discloses an operating platform for construction of a cylindrical pier, which comprises a platform body, wherein the platform body comprises at least two pedal units, the pedal units are sequentially connected into a closed graph, and the pedal units comprise: a first pedal; one side surface of the second pedal is connected with one side surface of the first pedal; the protecting net upright columns are respectively arranged on the upper surface of one end of the first pedal, which is far away from the second pedal, and the upper surface of one end of the second pedal, which is close to the first pedal; the protective net is arranged on two adjacent protective net stand columns and is detachably connected with the protective net stand columns. The invention provides an operating platform for cylindrical pier construction, which is simple to install, does not occupy space and has high connection strength.

Description

A operation platform for cylinder mound construction

Technical Field

The invention relates to the technical field of bridge cylindrical pier construction, in particular to an operating platform for cylindrical pier construction.

Background

In the pouring and construction process of the bridge cylindrical pier, an operation platform needs to be erected on a template of the bridge cylindrical pier to facilitate operation of construction technicians, and the operation platform comprises pedals and a fence. According to prior art, there is an aerial working platform for cylinder pier construction, and annular operation frame includes footboard, circumference fossil fragments, radial fossil fragments and connecting ring, and the installation is complicated between them, and the footboard is a whole, accounts for the space, and operation platform directly passes through the bolt fastening on cylinder pier template simultaneously, and joint strength is low, and the installation is troublesome.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the operating platform for the construction of the cylindrical pier is simple to install, does not occupy space and is high in connection strength.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an operation platform for cylinder pier construction, includes the platform body, the platform body include two at least footboard units, the footboard unit connect gradually into a confined figure, the footboard unit include:

a first pedal;

one side surface of the second pedal is connected with one side surface of the first pedal;

the protecting net upright columns are respectively arranged on the upper surface of one end of the first pedal, which is far away from the second pedal, and the upper surface of one end of the second pedal, which is close to the first pedal;

the protective nets are arranged on two adjacent protective net stand columns and are detachably connected with the protective net stand columns;

the outer side surface of the first pedal, which is far away from the second pedal, is provided with a through hole, the outer side surface of the second pedal, which is far away from the first pedal, is also provided with a through hole, and a bolt penetrates through two adjacent through holes to realize the connection of two adjacent pedal units;

it is still including the bracket body that is used for the fixed platform body, bracket body shape be the flange form, the upper end of bracket body inside wall be equipped with the annular arch, the annular arch on be equipped with the second mounting hole, the bolt passes the second mounting hole and fixes the bracket body on cylinder mound template, when the bracket body is fixed on cylinder mound template, bracket body inside wall support and lean on cylinder mound template lateral surface, the annular arch be located cylinder mound template upper surface, bracket body basal surface support and lean on the step of cylinder mound template lateral surface.

After adopting the structure, compared with the prior art, the invention has the following advantages: the platform body comprises at least two pedal units, and the pedal units are sequentially connected into a closed graph, so that the platform occupies no space; simultaneously, the pedal units are divided into a first pedal, a second pedal, a protecting net stand column and a protecting net, the protecting net is detachably connected with the protecting net stand column, the bolts penetrate through first through holes between the first pedal and the second pedal to achieve connection between two adjacent pedal units, and installation is simple. II, II and III.

Preferably, the first pedal comprises:

a frame;

the movable uncovering plate is positioned on the frame and swings up and down on the frame;

the support bar for support activity is taken off the apron, the support bar establish in the frame, the activity take off the apron and lean on the support bar upper surface, simple structure, but the activity is taken off the apron and can the luffing motion simultaneously, is convenient for pour into the concrete.

Preferably, the first pedal and the second pedal are identical in structure and low in cost.

Preferably, the frame is trapezoidal, the upper bottom corresponding to the trapezoid is positioned on the inner side of the pedal unit, the strength is high, the frame is convenient to contact with the cylindrical pier, and the gap between the frame and the cylindrical pier is small.

Preferably, the upper surface of the frame is provided with a first mounting hole which is convenient to fix on the cylindrical pier, so that the frame is convenient to fix on the cylindrical pier.

Preferably, the number of the movable uncovering plates is two, and the movable uncovering plates are half-split and convenient to use.

Preferably, the pedal lifting device further comprises a lifting ring, one end of the lifting ring is arranged on the first pedal, and the other end of the lifting ring is arranged on the second pedal, so that the lifting is convenient.

Preferably, the upper end and the lower end of the upright post of the protecting net are provided with hanging holes, the protecting net is provided with hooks, and the hooks are respectively hung in the hanging holes, so that the installation and the disassembly are convenient.

Preferably, the pedal unit is further provided with a stand column foot sleeve, the protecting net stand column is clamped in the stand column foot sleeve, and a bolt penetrates through the stand column foot sleeve and is in threaded connection with the protecting net stand column, so that the pedal unit is convenient to mount and does not occupy space.

Preferably, the one side of the second pedal is connected with the one side of the first pedal, that is, the one side of the second pedal is welded on the upper surface of the first pedal, the other side of the second pedal is welded on the upper surface of the second pedal, and the one side of the second pedal is welded on the one side of the first pedal, so that the connection is reliable.

Preferably, the second mounting hole is a long-strip-shaped hole, so that the bracket body can be conveniently connected with the cylindrical pier template.

Preferably, the bracket further comprises a platform beam for supporting the operating platform, the platform beam is arranged on the upper surface of the bracket body, and the platform beam is distributed along the circumferential direction of the bracket body so as to be convenient for supporting the platform beam.

Preferably, one end of the platform beam is arranged on the upper surface of the bracket body, the other end of the platform beam extends out of the bracket body, and the bearing capacity of the platform beam is high.

Preferably, the upper surface of the other end of the platform beam is provided with a limiting block for limiting the operating platform, so that the operating platform is prevented from being separated from the platform beam.

Preferably, the platform further comprises a U-shaped buckle, the lower end of the U-shaped buckle is sleeved on the platform beam, the upper end of the U-shaped buckle is fixed on the operating platform, the operating platform is conveniently fixed on the platform beam, the installation is simple, and the reliability is high.

Preferably, the upper surface of the bracket body is also provided with a hoisting ring, so that the bracket body can be conveniently hoisted.

Preferably, the outer side surface of the bracket body is provided with a plurality of second through holes, and the second through holes are distributed along the outer circumference of the bracket body, so that the weight of the bracket body is reduced.

Preferably, the adjustable locking device further comprises an adjustable locking bolt and a fixed seat, wherein the fixed seat is respectively arranged in the second through hole, the adjustable locking bolt penetrates through the fixed seat and abuts against the cylindrical pier, the lower end of the bracket body is locked by the adjustable locking bolt, the left-right swinging of the bracket body is prevented, and the reliability is high.

Preferably, the bracket body includes at least two bracket units, the bracket units are connected in sequence to form a flange, and the bracket unit includes:

an upper plate;

a base plate;

the two side plates are respectively positioned on the left side and the right side of the bracket unit, the upper plate, the bottom plate and the side plates are enclosed to form a closed pattern, the upper ends of the side plates are connected with the upper plate, the lower ends of the side plates are connected with the bottom plate, the side plates are provided with connecting holes, and bolts penetrate through the two adjacent connecting holes to realize the connection of the two adjacent bracket units.

Drawings

Fig. 1 is a perspective view of an operation platform body for cylindrical pier construction according to the present invention.

Fig. 2 is a perspective view of an angle of an operation platform pedal unit for the construction of a cylinder pier according to the present invention.

Fig. 3 is a perspective view of another angle of an operation platform pedal unit for the construction of a cylinder pier according to the present invention.

Fig. 4 is a perspective view of an operation platform bracket body for construction of a cylindrical pier according to the present invention.

Fig. 5 is an enlarged schematic view of a in fig. 4.

Fig. 6 is a perspective view of an operating platform clevis for use in the construction of a cylindrical pier according to the present invention.

Fig. 7 is a perspective view of the U-shaped buckle of the operation platform for the construction of the cylindrical pier on the bracket body.

Fig. 8 is a perspective view of the operation platform bracket body for construction of the cylindrical pier, which is arranged on the cylindrical pier template.

Fig. 9 is a perspective view of the connection between the operation platform body and the bracket body for the construction of the cylindrical pier.

Fig. 10 is a perspective view of an operation platform for construction of a cylindrical pier according to the present invention mounted on a formwork of the cylindrical pier.

The pedal comprises a pedal unit 1, a pedal unit 2, a first pedal 210, a frame 220, a movable uncovering plate 230, a supporting strip 240, a first mounting hole 3, a second pedal 4, a protecting net upright post 5, a protecting net 6, a first through hole 7, a hoisting ring 8, a hanging hole 9, a hook 10, an upright post foot sleeve 11, a reinforcing plate 12, a bracket body 120, a bracket unit 121, an upper plate 122, a bottom plate 123, a side plate 124, a connecting hole 13, an annular bulge 14, a second mounting hole 15, a platform beam 16, a U-shaped buckle 17, a second through hole 18, an adjusting locking bolt 19, a fixing seat 20, a limiting block 21, a locking nut 22 and a reinforcing rib.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1 and 2, the invention provides an operating platform for construction of a cylindrical pier, which comprises a platform body, wherein the platform body comprises at least two pedal units 1, and the pedal units 1 are sequentially connected to enclose a closed graph. Specifically, footboard unit 1 includes first footboard 2, second footboard 3, protecting wire net stand 4 and protecting

wire net

5, and 2 sides of first footboard link together with 3 sides of second footboard, and protecting wire net stand 4 establishes respectively in 2 left sides of first footboard and 3 left sides of second footboard, and protecting wire net 5 can dismantle with protecting wire net stand 4 and be connected, does not account for the space, only establishes a protecting wire net stand 4 on such a footboard, simple structure, and is with low costs. The left side surface and the right side surface of each pedal unit 1 are provided with first through holes 6, bolts penetrate through the two adjacent first through holes 6 to achieve connection of the two adjacent pedal units 1, and installation is simple. Specifically, the first through holes 6 are respectively formed on the side surface of the first pedal 2 far away from the second pedal 3 and the side surface of the second pedal 3 far away from the first pedal 2. Specifically, the guard net pillars 4 are respectively provided at positions of the first step 2 away from the center of the step unit 1 and at positions of the second step 3 away from the center of the step unit 1.

As an embodiment, as shown in fig. 2 and 3, the first step 2 includes a frame 210, a removable cover plate 220 and a support bar 230, the support bar 230 is disposed in the frame 210, the removable cover plate 220 is disposed on the frame 210, and the removable cover plate 220 swings up and down on the frame 210, so as to pour concrete into the cylindrical pier formwork. The structure is simple. Specifically, the second step plate 3 and the first step plate 2 are identical in structure, and the first step plate 2 and the second step plate 3 are welded together.

As an embodiment, the frame 210 is trapezoidal, and the side of the frame 210 corresponding to the upper bottom of the trapezoid is located inside the pedal unit 1, so that the frame 210 is more easily contacted with the outer side of the cylindrical pier template, and the frame 210 and the cylindrical pier template are small in distance, convenient to construct and high in reliability. Specifically, the first step 2 and the second step 3 are connected with a waist and a waist which are trapezoidal.

In one embodiment, the frame 210 has a first mounting hole 240 on the upper surface thereof to facilitate the connection of the frame 210 with the pillar form.

As an embodiment, the number of the movable uncovering plates 220 is two, and the movable uncovering plates 220 are half-opened, so that concrete can be poured conveniently.

As an embodiment, in order to facilitate the lifting of the pedal unit 1, a lifting ring 7 is provided on the pedal unit 1, and specifically, both ends of the lifting ring 7 are provided on the first pedal 2 and the second pedal 3, respectively.

As an embodiment, in order to facilitate the detachable connection between the protecting net 5 and the protecting net upright post 4, hanging holes 8 are respectively arranged at the upper end and the lower end of the protecting net upright post 4, hooks 9 corresponding to the hanging holes 8 are arranged on the protecting net 5, and the hooks 9 are hung in the hanging holes 8 to realize that the protecting net 5 is installed on the protecting net upright post 4. In particular, the hook 9 is open towards. Specifically, the hanging holes 8 are respectively formed in the left side and the right side of the protecting net upright post 4, so that the protecting nets 5 on the left side and the right side of the protecting net upright post 4 are hung in the hanging holes 8 conveniently. Specifically, the hook 9 is 7-shaped, and is simple in structure and convenient to install.

As an embodiment, can dismantle the connection between for making between protecting wire net stand 4 and the footboard unit 1, establish the stand podotheca 10 that corresponds with protecting wire net stand 4 on

footboard unit

1, 4 lower extreme cards of protecting wire net stand are equipped with the hole on stand podotheca 10, and protecting wire net stand 4 is equipped with the screw that corresponds, and the bolt passes the hole spiro union in the screw, realizes protecting wire net stand 4's fixed. Specifically, the guard net upright post 4 and the upright post foot sleeve 10 are both columnar, so that the guard net upright post 4 cannot easily rotate, and the reliability is high.

As an embodiment, in order to facilitate the connection between the first pedal 2 and the second pedal 3, the side surface of the first pedal 2 and the side surface of the second pedal 3 are welded, and a reinforcing plate 11 is also arranged, wherein one end of the reinforcing plate 11 is welded on the upper surface of the first pedal 2, and the other end of the reinforcing plate 11 is welded on the upper surface of the second pedal 3. Specifically, the reinforcing plates 11 are distributed along the length of the gap where the first step 2 contacts the second step 3.

Specifically, the principle of the invention is that the platform body comprises at least two pedal units 1, and the pedal units 1 are sequentially connected into a closed graph without occupying space; simultaneously footboard unit 1 divide into first footboard 2, second footboard 3, protecting wire net stand 4 and protecting wire net 5, and protecting wire net 5 can be dismantled with protecting wire net stand 4 and be connected, utilizes the bolt to pass first through-hole 6 between first footboard 2 and the second footboard 3 to realize connecting between two adjacent footboard units 1, and the installation is simple.

Specifically, the platform body can be assembled and then hoisted, and can also be hoisted and then assembled. The pedal unit 1 is divided into a first pedal 2, a second pedal 3, a protecting net upright post 4 and a protecting net 5, so that the transportation and the transfer do not occupy space, and the installation and the transportation are convenient.

As shown in fig. 4 and 8, it includes bracket body 12, bracket body 12 is the flange form, for the convenience of fixing bracket body 12 on cylinder pier template, annular protrusion 13 is established to bracket body 12 medial surface, annular protrusion 13 salient in bracket body 12 inside wall, establish second mounting hole 14 on annular protrusion 13 upper surface simultaneously, put bracket body 12 on cylinder pier template, annular protrusion 13 supports and leans on cylinder pier template upper surface this moment, bracket body 12 inside wall supports and leans on the lateral surface of cylinder pier template, and bracket body 12 basal surface supports and leans on the step of cylinder pier template, utilize the bolt to pass second mounting hole 14 spiro union in the screw hole of cylinder pier template simultaneously (the screw hole of cylinder pier upper surface and the step of lateral surface are established in advance). Specifically, the annular projection 13 is integral with the carrier body 12. Specifically, the second mounting hole 14 is provided on the annular protrusion 13

As an example, for the convenience of installation, the second installation hole 14 is a long hole, which is easily aligned with the threaded hole.

As an embodiment, in order to support the operation platform and fix the operation platform on the bracket body 12, a platform beam 15 is disposed on the upper surface of the bracket body 12, and the platform beam 15 is distributed along the outer circumference of the bracket body 12. Specifically, one end of the platform beam 15 is arranged on the bracket body 12, and the other end of the platform beam 15 extends out of the bracket body 12, so that operating platforms of different specifications can be conveniently arranged on the platform beam 15. Specifically, in order to limit the operation platform, a limiting block 20 is provided on the upper surface of the other end of the platform beam 15.

As an embodiment, as shown in fig. 6 and 7, in order to fix the operation body on the platform beam 15, it further comprises a U-shaped buckle 16, the lower end of the U-shaped buckle 16 is sleeved on the platform beam 15, the upper end of the U-shaped buckle 16 extends upwards through the operation platform and is locked on the upper surface of the operation platform by a locking nut 21. Specifically, the clevis 16 is located at the middle of the platform beam 15.

As an example, in order to facilitate the hoisting of the bracket body 12, the hoisting ring 6 is also provided on the bracket body 12. Specifically, the hoisting ring 6 is provided on the upper surface of the bracket body 12 at a position close to the inner ring.

As an embodiment, in order to reduce the weight of the bracket body 12, the cost and the hoisting difficulty, a plurality of second through holes 17 are provided on the outer side surface of the bracket body 12, and the second through holes 17 are distributed along the outer circumference of the bracket body 12. Specifically, in order to prevent the bracket body 12 from swinging left and right, a fixing seat 19 is provided in the second through hole 17, and an adjustment locking bolt 18 passes through the fixing seat 19 and abuts against the outer side surface of the cylindrical pier template. Specifically, the adjustment locking bolts 18 correspond to the fixing seats 19 one to one.

As an example, as shown in fig. 5, the bracket body 12 includes at least two bracket units 120, and the bracket units 120 are sequentially surrounded to form a flange shape. Specifically, the bracket unit 120 includes an upper plate 121, a bottom plate 122, and side plates 123, the side plates 123 are respectively located on the left and right sides of the upper plate 121, the bottom plate 122 is located directly below the upper plate 121, the bottom plate 122, and the side plates 123 enclose a closed figure, and the second through hole 17 is a space enclosed by the upper plate 121, the bottom plate 122, and the side plates 123. Specifically, the side plate 123 is provided at a side thereof with a coupling hole 124, and adjacent two bracket units 120 are fixedly coupled by bolts respectively passing through the coupling holes 124. Simple structure, and convenient installation and disassembly. Specifically, in order to increase the strength of the bracket unit 120, the second through hole 17 is provided with a reinforcing rib 22 therein.

Specifically, the principle of the invention is that the bracket body 12 is flange-shaped and is convenient to fix on the cylindrical pier template, specifically, the upper end of the inner side wall of the bracket body 12 is provided with the annular bulge 13, the annular bulge 13 is abutted against the upper surface of the cylindrical pier template, the inner side wall of the bracket body 12 is abutted against the outer side of the cylindrical pier template, and the bottom surface of the bracket body 12 is abutted against the step on the outer side of the cylindrical pier template, so that the contact area of the bracket body 12 and the cylindrical pier template is large, the connection strength of the bracket body 12 and the cylindrical pier template is high, and then the operation platform is fixed on the bracket body 12, the connection strength is high, and the installation is simple.

Specifically, the bracket body 12 can be assembled and then hoisted, or hoisted and then assembled, and is flexible to install.

The action process is as follows: mounting of the bracket body 12: firstly, assembling the bracket unit 120 into the bracket body 12, and fixing the bracket unit 120 together by bolts through the connecting holes 124; secondly, the bracket body 12 is placed on the cylindrical pier template, the annular bulge 13 is abutted against the upper surface of the cylindrical pier template, and the bottom surface of the bracket body 12 is abutted against a step on the outer side surface of the cylindrical pier; thirdly, a bolt penetrates through the second mounting hole 14 and is screwed in the threaded hole in the upper surface of the cylindrical pier; and fourthly, rotating the adjusting locking bolt 18, and screwing the adjusting locking bolt 18 in the fixed seat 19, so that the adjusting locking bolt 18 is abutted against the outer side face of the cylindrical pier, and the inner side face of the bracket body 12 is abutted against the outer side face of the cylindrical pier template. Therefore, the bracket body 1 and the cylindrical pier template are high in connection strength.

Installation of the platform body 1: firstly, the pedal units 1 are assembled together by using bolts to form a closed pattern; secondly, the guard net upright post 4 is arranged on the upright post foot sleeve 10; thirdly, hanging the protective net 5 on the protective net upright post 4; and fourthly, the U-shaped buckle 16 is sleeved on the platform beam 15, and the upper end of the U-shaped buckle 16 passes through the first mounting hole 240 to extend above the platform body and is locked by the locking nut 21. Facilitating the fixing of the platform body on the platform beam 15, fig. 9 and 10.

On the basis of the above-described aspects, if various changes or modifications to the present invention are made without departing from the spirit and scope of the present invention, it is intended that the present invention also include these changes and modifications if they fall within the scope of the claims and the equivalent technical scope of the present invention.

Claims

1. The utility model provides an operation platform for cylinder mound construction, includes the platform body, its characterized in that: the platform body include two at least footboard units (1), footboard unit (1) connect gradually into a confined figure, footboard unit (1) include:

a first pedal (2);

one side surface of the second pedal (3) is connected with one side surface of the first pedal (2);

the net protecting upright posts (4) are respectively arranged on the upper surface of one end, far away from the second pedal (3), of the first pedal (2) and the upper surface of one end, close to the first pedal (2), of the second pedal (3);

the protective net (5) is arranged on two adjacent protective net upright columns (4), and the protective net (5) is detachably connected with the protective net upright columns (4);

two adjacent pedal units (1) are detachably connected;

it is still including bracket body (12) that is used for the fixed platform body, bracket body (12) shape be the flange form, the upper end of bracket body (12) inside wall be equipped with annular arch (13), annular arch (13) on be equipped with second mounting hole (14), the bolt passes second mounting hole (14) and fixes bracket body (12) on cylinder pier template, when bracket body (12) are fixed on cylinder pier template, bracket body (12) inside wall support and lean on cylinder pier template lateral surface, annular arch (13) be located cylinder pier template upper surface, bracket body (12) basal surface support and lean on the step of cylinder pier template lateral surface.

2. An operation platform for construction of a cylindrical pier according to claim 1, wherein: the first pedal (2) comprises:

a frame (210);

the movable uncovering plate (220), the movable uncovering plate (220) is positioned on the frame (210), and the movable uncovering plate (220) swings up and down on the frame (210);

and the supporting strips (230) are used for supporting the movable uncovering plate (220), the supporting strips (230) are arranged in the frame (210), and the movable uncovering plate (220) is abutted against the upper surfaces of the supporting strips (230).

3. An operation platform for construction of a cylindrical pier as claimed in claim 2, wherein: the first pedal (2) and the second pedal (3) have the same structure.

4. An operation platform for construction of a cylindrical pier as claimed in claim 2, wherein: the upper surface of the frame (210) is provided with a first mounting hole (240) which is convenient to fix on a cylindrical pier.

5. An operation platform for construction of a cylindrical pier according to claim 1, wherein: both ends all are equipped with hanging hole (8) about protecting net stand (4), protecting net (5) on be equipped with couple (9), couple (9) hang respectively in hanging hole (8).

6. An operation platform for construction of a cylindrical pier according to claim 1, wherein: the support frame further comprises a platform cross beam (15) used for supporting the operating platform, the platform cross beam (15) is arranged on the upper surface of the support frame body (12), and the platform cross beam (15) is distributed along the circumferential direction of the support frame body (12).

7. An operation platform for construction of a cylindrical pier according to claim 1, wherein: the platform is characterized by further comprising a U-shaped buckle (16), the lower end of the U-shaped buckle (16) is sleeved on the platform cross beam (15), and the upper end of the U-shaped buckle (16) is fixed on the operating platform.

8. An operation platform for construction of a cylindrical pier according to claim 1, wherein: the outer side surface of the bracket body (12) is provided with a plurality of second through holes (17), and the second through holes (17) are distributed along the outer circumference of the bracket body (12).

9. An operation platform for construction of a cylindrical pier according to claim 8, wherein: it still includes regulation locking bolt (18) and fixing base (19), fixing base (19) establish respectively in second through-hole (17), regulation locking bolt (18) pass fixing base (19) and lean on the cylinder pier forms.

10. An operation platform for construction of a cylindrical pier according to claim 1, wherein: the bracket body (12) comprises at least two bracket units (120), the bracket units (120) are sequentially connected to form a flange shape, and the bracket units (120) comprise:

an upper plate (121);

a base plate (122);

the two side plates (123) are respectively positioned on the left side and the right side of the bracket unit (120), the upper plate (121), the bottom plate (122) and the side plates (123) are enclosed to form a closed figure, the upper ends of the side plates (123) are connected with the upper plate (121), the lower ends of the side plates (123) are connected with the bottom plate (122), connecting holes (124) are formed in the side plates (123), and bolts penetrate through the two adjacent connecting holes (124) to realize the connection of the two adjacent bracket units (120).