CN209755624U

CN209755624U - Protection tool and protection structure

Info

Publication number: CN209755624U
Application number: CN201822163804.XU
Authority: CN
Inventors: 不公告发明人
Original assignee: Guangdong Remac Equipment Information Technology Co Ltd
Current assignee: Guangdong Ruizhu residential technology Co.,Ltd.
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2019-12-10
Anticipated expiration: 2028-12-21

Abstract

the utility model relates to a protection frock and protective structure, this protection frock includes: the mounting piece is used for being connected with the main reinforcement detachable hoop of the truss reinforcing steel bar; and the protective piece is assembled and connected with the mounting piece and can be covered above the main bars of the truss reinforcing steel bars. So, even if the concrete material among the cloth equipment drops, and can not glue and form the concrete bonding layer on the main reinforcement, can effectively prevent this concrete bonding layer to the influence of post-cast layer concrete and coincide bottom plate's bonding strength. Compared with the traditional protective measures adopting tape pasting, the protective tool can quickly and effectively shield and protect the truss reinforcing steel bars, is convenient to install and use, can greatly save auxiliary materials and labor cost, and can not influence production efficiency and station beats.

Description

Protection tool and protection structure

Technical Field

The utility model relates to a coincide prefabricated component technical field especially relates to a protection frock and protective structure.

Background

When the bottom plate is cast and tamped in the production of concrete prefabricated parts such as a composite truss floor slab, concrete in the distributing equipment easily drops from a discharge opening above the die and is adhered to exposed main ribs of truss reinforcing steel bars. If the cleaning is not carried out in time, a dry concrete layer is formed on the main reinforcement of the truss after the concrete is solidified, and when the post-cast layer concrete is subsequently carried out, the dry concrete layer easily causes that the prefabricated bottom plate connected through the truss steel bars and the post-cast layer steel bars are not tightly pulled or even separated, so that the integral structural strength of the laminated truss floor is influenced.

Aiming at the problem, the existing protection measures are that a layer of adhesive tape is stuck on the exposed main rib of the truss reinforcing steel bar, and the protective adhesive tape is torn off after the material is poured and distributed and before the maintenance operation, but the method has the following defects: the number of truss steel bars of the superposed member is usually large, so that the use amount of the adhesive tape is directly increased, and the production auxiliary material cost is greatly increased; the adhesive tapes are adhered by manpower, so that the labor intensity is high, and the labor cost is increased; in addition, the tape is easy to fall off after being adhered, the reliability is low, the tape is needed to be bound on the truss steel bars, the working procedure is prolonged, and the station beat in production is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, a protection tool is needed, which can quickly and effectively shield and protect the truss steel bars, is convenient to install and use, is beneficial to saving auxiliary materials and labor cost, and ensures the production efficiency and the working position beat; and the protective structure who forms on using this protection frock coincide bottom plate does benefit to and promotes prefabricated component production economy, guarantees product quality, ensures production efficiency simultaneously.

The technical scheme is as follows:

In one aspect, the application provides a protection tool, including:

The mounting piece is used for being connected with the main reinforcement detachable hoop of the truss reinforcing steel bar; and

And the protective part is assembled and connected with the mounting part and can be covered above the main bars of the truss reinforcing steel bars.

in order to avoid the concrete material in the distributing equipment falling onto the truss steel bars on the superposed bottom plate to form a bonding layer and influence the bonding strength of the concrete of the post-cast layer, the truss steel bars need to be protected. When the protection tool is used, the installation can be fixed by directly performing clamp connection on the main bar of the mounting piece and the truss steel bar, and then the protection piece is assembled on the mounting piece, so that the protection piece can be shielded above the main bar of the truss steel bar. So, even if the concrete material among the cloth equipment drops, can be separated by the protection piece and keep off, and can not glue and form concrete bonding layer on connecting to the main muscle, can effectively prevent this concrete bonding layer to the influence of post-cast layer concrete and coincide bottom plate's bonding strength. Compared with the traditional protective measures adopting tape pasting, the protective tool can quickly and effectively shield and protect the truss reinforcing steel bars, is convenient to install and use, can greatly save auxiliary materials and labor cost, and can not influence production efficiency and station beats.

The technical solution of the present application is further explained below:

In one embodiment, the mounting member includes a base plate, and a clip body and a buckle body respectively disposed on opposite sides of the base plate, the clip body is configured to be fixed to a main bar clip of the truss reinforcement bar, and the protection member is provided with an assembling portion, and the protection member is fastened to the buckle body through the assembling portion.

In one embodiment, the hoop body comprises a hoop body, the hoop body is provided with a hooping cavity, the hoop body comprises a first free end and a second free end, the first free end and the second free end are oppositely arranged at a certain interval to form an access gap, and the access gap is communicated with the hooping cavity.

In one embodiment, the clamp body further includes a first guide plate connected to the first free end and a second guide plate connected to the second free end, and the first guide plate and the second guide plate both extend outwardly away from the access notch and cooperate to form a flared structure.

In one embodiment, the side wall of the tightening cavity is provided with anti-skid convex teeth; or an anti-slip cushion layer is arranged on the side wall of the hooping cavity.

In one embodiment, the buckle body comprises a supporting plate arranged on the base plate and a clamping head arranged at the top end of the supporting plate; the protection part is the guard plate, assembly portion is for offering in the pilot hole on the guard plate, the dop can pass the pilot hole, and will the guard plate withhold and fix on the base plate.

in one embodiment, the clamping head is made of elastic materials, and the clamping head comprises a first clamping arm and a second clamping arm which are connected with each other, and the first clamping arm and the second clamping arm can approach or depart from each other;

Or the clamping head comprises a first elastic pressing part, a second elastic pressing part, a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm are rotatably connected with the supporting plate, the first elastic pressing part is arranged between the first clamping arm and the supporting plate in a pressed mode, the second elastic pressing part is arranged between the second clamping arm and the supporting plate in a pressed mode, and the first clamping arm and the second clamping arm can be close to or far away from each other.

In one embodiment, a leading-in cambered surface is arranged on one side, away from the base plate, of the clamping head.

In one embodiment, two positioning protrusions are oppositely arranged on one side of the base plate facing the buckle body, and the positioning protrusions are matched with the free end of the first clamping arm and the free end of the second clamping arm to form a positioning structure.

On the other hand, this application still provides a protective structure, it includes coincide bottom plate and as above protection frock, the coincide bottom plate includes the truss reinforcing bar, protection frock with the main muscle demountable assembly of truss reinforcing bar is connected.

the protection tool is applied to the protection structure formed on the overlapped bottom plate, so that the production economy of the prefabricated part is promoted, the product quality is ensured, and the production efficiency is ensured.

drawings

Fig. 1 is a schematic structural view of a protection tool according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an embodiment of a mounting member of the protective tooling of FIG. 1;

FIG. 3 is a schematic structural view of another embodiment of a mounting member of the protective tooling shown in FIG. 1;

FIG. 4 is a schematic structural view of a protection member of the protection tool shown in FIG. 1;

Fig. 5 is a schematic structural diagram of a protection structure according to an embodiment of the present invention.

Description of reference numerals:

10. the installation part comprises an installation part, 11, a base plate, 12, a hoop body, 121a, a clamping cavity, 121b, a first free end, 121c, a second free end, 122, an access notch, 123, a first guide plate, 124, a second guide plate, 13, a buckle body, 131, a support plate, 132, a clamping head, 132a, a first clamping arm, 132b, a second clamping arm, 132c, a guide-in cambered surface, 132d, a first elastic pressing piece, 132e, a second elastic pressing piece, 20, a protection part, 21, an assembly part, 30, a truss steel bar, 40, an overlapped bottom plate, 50, a positioning convex body, 100, a protection tool, 200 and a protection structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to," "disposed on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the specific manner of fixedly connecting one element to another element can be implemented by the prior art, and will not be described herein, and preferably, a screw-threaded connection is used.

unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, the terms "first" and "second" do not denote any particular quantity or order, but are merely used to distinguish names.

As shown in fig. 1, a protection tool 100 shown in an embodiment of the present application includes: a mounting member 10, wherein the mounting member 10 is used for being connected with a main reinforcement detachable clamping hoop of the truss reinforcing steel bar 30; and the protection piece 20 is assembled and connected with the mounting piece 10, and can be covered above the main bars of the truss reinforcing steel bars 30.

In order to avoid the concrete material in the distribution equipment from falling onto the truss reinforcement 30 on the laminated bottom plate 40 to form a bonding layer and influence the bonding strength of the post-cast concrete layer, the truss reinforcement 30 needs to be protected. Specifically to in this technical scheme, when protection frock 100 used, can directly carry out the clamp connection through installed part 10 and truss reinforcement 30's main muscle and alright realize the installation fixed, later assemble protection piece 20 to installed part 10 again on, protection piece 20 alright shield this moment and set up the main muscle top at truss reinforcement 30. Therefore, even if the concrete in the distributing equipment falls, the concrete can be separated and blocked by the protection part 20, and the concrete can not be adhered to the main rib to form a concrete bonding layer, so that the influence of the concrete bonding layer on the bonding strength of the post-cast layer concrete and the laminated bottom plate 40 can be effectively prevented. Compared with the traditional protective measures adopting tape bonding, the protective tool 100 can quickly and effectively shield the truss steel bars 30, namely, the main bars do not need to be wound or bonded, only the mounting pieces 10 are required to be connected with the main bars in a clamping manner, and therefore the mounting and the use are convenient. Moreover, according to the length of the truss reinforcing steel bar 30 to be protected, the protection part 20 with the proper length is manufactured in advance to be connected with the installation part 10, the secondary recycling can be realized, the problem that the adhesive tape is wasted in one-time use is avoided, and auxiliary materials and labor cost can be greatly saved. Meanwhile, the protection tool 100 is very fast to install and detach, and cannot affect production efficiency and station beats.

It should be noted that the number of the installation members 10 may be two or more according to the length of the main reinforcement of the truss reinforcement 30 to be protected. Two adjacent mounting members 10 are arranged at a predetermined interval, and the number is specifically used to ensure the mounting strength and the supporting reliability of the protection member 20.

With reference to fig. 1 and fig. 2, in an alternative embodiment, the mounting member 10 includes a base plate 11, and a clip body 12 and a buckle body 13 respectively disposed on two opposite sides of the base plate 11, that is, the base plate 11 is used to connect the clip body 12 and the buckle body 13, so that the overall structural strength of the mounting member 10 is high, and optionally, the base plate 11, the clip body 12 and the buckle body 13 are integrally formed or are assembled by welding or fastening; in addition, the base plate 11 also serves as a shield and seal, which prevents the concrete material falling down from leaking downward from the fitting portion 21. The clamp body 12 is used for being fixed with a main bar clamp of the truss reinforcement 30, the protection member 20 is provided with an assembling portion 21, and the protection member 20 is fixed with the buckle body 13 through the assembling portion 21 in a snap-fit manner. Therefore, the mounting member 10 and the main bar of the truss reinforcing steel bar 30 and the protection member 20 and the mounting member 10 can be quickly assembled and fixed, the operation mode is simple, the implementation is easy, and the connection strength is high.

With reference to fig. 1, based on the above embodiment, in an embodiment, the hoop body 12 includes a hoop body 121, the hoop body 121 has a hoop cavity 121a, the hoop body 121 includes a first free end 121b and a second free end 121c, the first free end 121b and the second free end 121c are oppositely disposed at an interval to form an access gap 122, and the access gap 122 is communicated with the hoop cavity 121 a. Therefore, during installation, the access notch 122 can be opposite to the main bar of the truss reinforcement 30, and then the main bar can be clamped into the clamping cavity 121a by pressing with a little force, so that the clamp body 12 and the main bar are firmly connected. When the truss reinforcement is required to be disassembled, the main reinforcement of the truss reinforcement 30 can be separated from the constraint of the clamping cavity 121a and withdrawn from the access notch 122 only by slightly pulling the mounting piece 10 in the opposite direction, so that the assembling and disassembling operation is very convenient.

It can be understood that the hoop body 121 is a semi-closed circular ring body formed by bending reinforcing steel bars and the like, and the hooping cavity 121a is a circular cavity surrounded by the circular ring body. The first free end 121b and the second free end 121c are both ends of a torus. In order to ensure firm and stable installation, the diameter of the hooping cavity 121a is smaller than that of the main reinforcement, the hoop body 121 can be in tight hooping connection with the main reinforcement through micro-deformation, and the inner wall of the hoop body 121 applies extrusion force and friction force to the main reinforcement, so that looseness can be effectively prevented.

Optionally, the hoop body 121 is made of plastic, metal, or the like with excellent elastic properties, so that the hoop body 121 has better contraction and expansion properties, and better tightening effect is exerted.

With continued reference to fig. 1 and 2, in one embodiment, the clip body 12 further includes a first guide plate 123 connected to the first free end 121b, and a second guide plate 124 connected to the second free end 121c, wherein the first guide plate 123 and the second guide plate 124 both extend outward away from the access notch 122 and cooperate to form a flared structure. Therefore, the flaring structure formed by the first guide plate 123 and the second guide plate 124 is convenient for the clamp body 12 and the main rib to realize initial positioning, and ensures the first installation accuracy; while providing a guiding function to facilitate alignment of the main ribs with the access notches 122 and to provide a smooth snap-fit into the gripping cavity 121a to improve assembly efficiency.

Due to the limitations of the work site and the conditions of the protection object, it may happen that the diameter of the main reinforcement is smaller than that of the tightening cavity 121a, which may result in the loose mounting member 10 and the main reinforcement after the mounting, which is not favorable for ensuring the protection effect of the protection member 20. Therefore, in a further technical scheme, the side wall of the tightening cavity 121a is provided with anti-skid convex teeth; or an anti-slip cushion layer is arranged on the side wall of the tightening cavity 121 a. Therefore, the contact force between the main reinforcement of the truss steel bar and the main reinforcement of the truss steel bar can be enhanced by arranging the anti-skidding convex teeth or the anti-skidding cushion layer, so that the service capability and the applicability of the clamp body 12 are improved, and the clamp body 12 can be firmly connected with the main reinforcement of the truss steel bar 30 under various working conditions.

With reference to fig. 1, fig. 2 and fig. 4, in addition, on the basis of any of the above embodiments, the buckle body 13 includes a supporting plate 131 disposed on the base plate 11, and a chuck 132 disposed at the top end of the supporting plate 131; the protection member 20 is a protection plate, the mounting portion 21 is a mounting hole opened in the protection plate, and the clamp 132 can pass through the mounting hole and press-fix the protection plate on the base plate 11. The supporting plate 131 is disposed such that the chuck 132 is spaced apart from the base plate 11, and the space formed by the spacing can be used for accommodating the shielding plate. When mounting, the fitting hole is aligned with the chucking head 132, and then the shielding plate is pressed downward with a slight force, the chucking head 132 passes through the fitting hole to be chucked between the chucking head 132 and the base plate 11. This assembly method easy operation, the feasibility of implementation is high, does benefit to and improves the efficiency of construction, and this connection structure's intensity is high.

It should be noted that the guard plate is preferably curved. Namely, after the concrete protective plate is installed, the convex surface of the protective plate faces the falling direction of the concrete. Through such structural design, the concrete material that drops can not pile up on the guard plate, and convenient regular cleaning does benefit to the protection efficiency who promotes the guard plate. However, although it is inevitable that a small amount of concrete is solidified and adhered to the surface of the protection plate after a long time of use, the normal use of the protection tool 100 is not affected by the condition. Because, in case the guard plate forms a whole with installed part 10 assembly connection back promptly, need not the split during follow-up use, also when protection frock 100 is dismantled to needs, accessible installed part 10 is whole to be separated with truss reinforcing bar 30, and the rethread installed part 10 is whole to be assembled on another truss reinforcing bar 30 that need protect. Make the protection frock 100 of this application possess the recycling ability, save the auxiliary material cost more, green. Meanwhile, the concrete material condensed on the surface of the protection plate can also prevent the protection plate and the mounting part 10 from rotating relatively, and when the protection tool 100 adopts a plurality of mounting parts 10, the plurality of mounting parts 10 can be simultaneously, rapidly and effectively hooped with the truss reinforcing steel bars 30.

in addition, in order to reduce the manufacturing and obtaining difficulty of the protection plate, in one embodiment, a standard PVC pipe can be used as a manufacturing source. The end face of the PVC pipe is used as a starting point, the arc-surface pipe piece can be obtained by cutting the pipe to the other end face of the pipe along the parallel direction and the axis, and the protection plate can be obtained after drilling (obtaining the assembly hole) on the pipe piece.

Of course, the protection plate can also be obtained by adopting a steel plate to perform a bending process.

referring to fig. 1, in a further embodiment, the chuck 132 is made of an elastic material, and the chuck 132 includes a first chuck arm 132a and a second chuck arm 132b connected to each other, and the first chuck arm 132a and the second chuck arm 132b can move toward or away from each other. Therefore, when the protection plate is pressed downward, the first and second catching arms 132a and 132b having excellent elastic ability are relatively swung close to each other under the pressing of the wall of the fitting hole to reduce the volume of the chucking head 132, so that the chucking head 132 smoothly passes through the fitting hole; and after the chuck 132 passes through the assembly hole, under the effect of the resilience force, the first clamping arm 132a and the second clamping arm 132b can be automatically unfolded, so that the volume of the chuck 132 is increased and is larger than the aperture of the assembly hole (namely, the length between the free end of the first opening/closing 132a and the free end of the second clamping arm 132b is larger than the aperture of the assembly hole), thereby the chuck 132 can be firmly fastened and fixed on the substrate 11.

It should be noted that, in order to ensure excellent structural flexibility of the chuck 132, the support plate 131 is designed to be flat and rectangular, and the plane where the first and second catching arms 132a and 132b are located is perpendicularly intersected and connected with the wider plane of the support plate 131. In addition, the supporting plate 131 is designed to have a narrow top and a wide bottom, so that the purposes of integrating elastic capacity and structural strength can be achieved. It is necessary to ensure that the width of the lower wide portion of the support plate 131 is smaller than the diameter of the fitting hole to ensure that the shielding plate can be normally fitted over the chucking head 132.

Or, referring to fig. 3, as an alternative embodiment of the above embodiment, in another embodiment, the chuck 132 includes a first elastic pressing member 132d, a second elastic pressing member 132e, a first clamping arm 132a and a second clamping arm 132b, the first clamping arm 132a and the second clamping arm 132b are both rotatably connected to the supporting plate 131, the first elastic pressing member 132d is pressed between the first clamping arm 132a and the supporting plate 131, the second elastic pressing member 132e is pressed between the second clamping arm 132b and the supporting plate 131, and the first clamping arm 132a and the second clamping arm 132b can move closer to or away from each other. That is, when the pressing force of the hole wall of the assembly hole acts, the first arm 132a can press the first elastic pressing member 132d to contract, and the second arm 132b synchronously presses the second elastic pressing member 132e to contract, so that the volume of the chuck 132 is reduced and the chuck can pass through the assembly hole; after the chuck 132 passes through the assembly hole, the first elastic pressing member 132d and the second elastic pressing member 132e are extended and reset under the action of the elastic force due to the loss of the pressing force of the hole wall, and further the first clamping arm 132a and the second clamping arm 132b can be pushed to rotate relatively and move away from each other, so that the width of the free end of the first clamping arm 132a and the width of the free end of the second clamping arm 132b are larger than the aperture of the assembly hole, and finally the protection plate is buckled on the base plate 11, thereby ensuring the firm installation of the protection plate.

Referring to fig. 1, on the basis of the above embodiment, in an embodiment, a leading-in arc surface 132c is disposed on a side of the chuck 132 away from the base plate 11. The installation of the guiding arc 132c makes the chuck 132 more easily pass through the assembling hole, and ensures that the installation member 10 and the protection member 20 are more conveniently and labor-saving to assemble.

it will be appreciated that the cartridge 132 is designed as an arrow or the like.

Referring to fig. 1 and fig. 2, in order to ensure that the protection plate is more stably mounted, in an embodiment, two positioning protrusions 50 are oppositely disposed on a side of the base plate 11 facing the buckle 132, and the positioning protrusions 50 cooperate with a free end of the first latch arm 132a and a free end of the second latch arm 132b to form a positioning structure. Therefore, the two positioning protrusions 50 (which are arranged in a bar shape along the width direction of the substrate 11) protruding upwards are matched with the free ends of the first clamping arms 132a and the second clamping arms 132b, so that the arc-shaped protection plate can be adapted to the arc-shaped protection plate, and the protection plate is stably positioned and clamped. Referring to fig. 1, the free ends of the first and second catching arms 132a and 132b are portions extending in a longitudinal direction and contacting the guard.

with reference to fig. 5, in another aspect, the present application further provides a protection structure 200, which includes a laminated bottom plate 40 and the protection tool 100 as described above, where the laminated bottom plate 40 includes the truss reinforcement 30, and the protection tool 100 is detachably assembled and connected to the main reinforcement of the truss reinforcement 30. The protection structure 200 formed by applying the protection tool 100 to the overlapped bottom plate 40 is beneficial to improving the production economy of the prefabricated part, ensures the product quality and simultaneously ensures the production efficiency.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a protection frock which characterized in that includes:

2. The protection tool of claim 1, wherein the mounting member comprises a base plate, and a clamp body and a buckle body which are respectively arranged on two opposite side surfaces of the base plate, the clamp body is used for being fixed with a main reinforcement clamp of the truss reinforcement, the protection member is provided with an assembling portion, and the protection member is fixed with the buckle body in a clamping mode through the assembling portion.

3. The protection tool according to claim 2, wherein the hoop body comprises a hoop body, the hoop body is provided with a hoop cavity, the hoop body comprises a first free end and a second free end, the first free end and the second free end are oppositely arranged at a gap to form an access gap, and the access gap is communicated with the hoop cavity.

4. The protective tooling of claim 3, wherein the clamp body further comprises a first guide plate connected to the first free end and a second guide plate connected to the second free end, the first guide plate and the second guide plate both extending outwardly away from the access opening and cooperating to form a flared structure.

5. The protection tool according to claim 3, wherein the side wall of the tightening cavity is provided with anti-skid convex teeth; or an anti-slip cushion layer is arranged on the side wall of the hooping cavity.

6. The protection tool according to claim 2, wherein the buckle body comprises a support plate arranged on the base plate and a chuck arranged at the top end of the support plate; the protection part is the guard plate, assembly portion is for offering in the pilot hole on the guard plate, the dop can pass the pilot hole, and will the guard plate withhold and fix on the base plate.

7. The protection tool according to claim 6, wherein the chuck is made of an elastic material, the chuck comprises a first clamping arm and a second clamping arm which are connected with each other, and the first clamping arm and the second clamping arm can approach or depart from each other;

8. The protective tool according to claim 6, wherein a lead-in cambered surface is arranged on one side, away from the base plate, of the chuck.

9. the protection tool according to claim 7, wherein two positioning protrusions are oppositely arranged on one side, facing the buckle body, of the base plate, and the positioning protrusions are matched with the free end of the first clamping arm and the free end of the second clamping arm to form a positioning structure.

10. A protective structure, comprising a laminated bottom plate and a protective tool according to any one of claims 1 to 9, wherein the laminated bottom plate comprises truss steel bars, and the protective tool is detachably assembled and connected with main bars of the truss steel bars.