CN112609831A - Steel pipe constraint section steel recycled concrete column-beam assembled node and installation method - Google Patents
Steel pipe constraint section steel recycled concrete column-beam assembled node and installation method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 219
- 239000010959 steel Substances 0.000 title claims abstract description 219
- 239000004567 concrete Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000009434 installation Methods 0.000 title abstract description 11
- 238000009415 formwork Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 16
- 239000011150 reinforced concrete Substances 0.000 abstract description 9
- 238000003032 molecular docking Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- 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
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- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- Architecture (AREA)
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- Structural Engineering (AREA)
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- Business, Economics & Management (AREA)
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Abstract
本发明公开了一种钢管约束型钢再生砼柱‑梁装配式节点及安装方法，节点主要由两个边框柱、外接管套、连接构件和型钢混凝土螺旋箍筋梁组成。外接管套设置在两个边框柱的连接处之间。连接构件包括螺纹紧固件、连接板、第一H型钢和U型钢，连接板通过螺纹紧固件固定在边框柱和外接管套上，第一H型钢通过螺纹紧固件固定在连接板上。型钢混凝土螺旋箍筋梁，型钢混凝土螺旋箍筋梁内置有形状与第一H型钢相适配的第二H型钢，第一H型钢和第二H型钢对接并通过U型钢和螺纹紧固件固定对接。将U形钢置于第一H型钢和第二H型钢的凹槽内，通过螺纹紧固件实现紧固连接，结构稳定且便于安装。施工方法降低了现场施工难度和繁杂程度，提高了施工效率。
The invention discloses a steel tube-constrained section steel recycled concrete column-beam assembled node and an installation method. The node is mainly composed of two frame columns, an outer pipe sleeve, a connecting member and a section steel concrete spiral stirrup beam. The outer pipe sleeve is arranged between the joints of the two frame columns. The connecting components include threaded fasteners, connecting plates, the first H-shaped steel and U-shaped steel, the connecting plate is fixed on the frame column and the outer pipe sleeve through the threaded fasteners, and the first H-shaped steel is fixed on the connecting plate through the threaded fasteners . The reinforced concrete spiral stirrup beam has a built-in second H-shaped steel whose shape matches the first H-shaped steel, and the first H-shaped steel and the second H-shaped steel are butted and fixed by U-shaped steel and threaded fasteners docking. The U-shaped steel is placed in the grooves of the first H-shaped steel and the second H-shaped steel, and the fastening connection is realized by threaded fasteners, and the structure is stable and easy to install. The construction method reduces the difficulty and complexity of on-site construction and improves the construction efficiency.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a steel pipe constraint section steel recycled concrete column-beam assembled node and an installation method.
Background
A large amount of waste concrete generated in aspects of dismantling and transforming original buildings in urbanization construction and cities, severe damage to a large amount of buildings caused by earthquakes and the like can be used as coarse aggregate to prepare recycled concrete, the waste concrete is recycled, the pollution of the waste concrete to the environment is reduced, the construction cost can be reduced, natural resources are saved, and therefore the effective utilization of the recycled concrete in engineering becomes a great demand for recycling building materials and recycling building wastes.
At present, the connection of reinforcing steel bars in the assembled beam-column joint adopts mechanical connection, sleeve grouting connection and welding connection. The quality of the connecting piece can not be ensured in the field construction of the mechanical connection of the steel bar, the matching rate of the steel bar and the connecting piece preprocessed in a factory is extremely low, and the stability of internal force conduction in the connection of the steel bar is difficult to ensure. The sleeve quantity, outward appearance are sealed in the actual work progress of sleeve grout connection, are unfavorable for the quality control to the sleeve butt joint is complicated, and the grout volume can't be controlled, makes the work progress must consume a large amount of time and cost of labor. The phenomenon of internal stress unevenness can appear in welded connection, causes the reinforcing bar fragility grow, and the hardness grow and needs special equipment during field operation, and energy resource consumption is big, and easy polluted environment is higher to construction environment's requirement.
Disclosure of Invention
The invention aims to provide a steel pipe constraint section steel recycled concrete column-beam assembly type node and an installation method, which are convenient for the connection construction of steel bars at the beam column node.
The technical scheme adopted by the invention is as follows: a steel pipe restraint shaped steel regeneration concrete column-roof beam assembled node includes:
two frame posts;
the external connecting pipe sleeve is arranged between the connecting parts of the two frame columns;
the connecting member comprises a threaded fastener, a connecting plate, first H-shaped steel and U-shaped steel, the connecting plate is fixed on the frame column and the outer connecting sleeve through the threaded fastener, and the first H-shaped steel is fixed on the connecting plate through the threaded fastener;
the section steel concrete spiral stirrup roof beam, the section steel concrete spiral stirrup roof beam embeds has the second H shaped steel of shape and first H shaped steel looks adaptation, first H shaped steel and second H shaped steel pass through the fixed butt joint of U shaped steel and threaded fastener.
Has the advantages that: this steel pipe restraint shaped steel regeneration concrete column-roof beam assembled node passes through the fastening connection that the first H shaped steel of screw fastener cooperation, second H shaped steel and U shaped steel realized high strength, aligns the link edge of first H shaped steel and second H shaped steel, arranges the U-shaped steel in the recess of first H shaped steel and second H shaped steel again, realizes fastening connection through screw fastener, stable in structure and the installation of being convenient for. The second H-shaped steel is arranged at the connecting end of the steel pipe restrained profile steel spiral stirrup beam, concrete is poured after the steel pipe restrained profile steel regenerated concrete column-beam assembled node is installed, most components are prefabricated in a factory, and only field assembly is needed, so that the problem of complex beam column node construction is effectively solved, and the steel pipe restrained profile steel regenerated concrete column-beam assembled node has the advantages of reasonable force transmission, convenience in construction, economy, reliability, good anti-seismic performance and the like.
Further, the connecting plate includes two L shape connecting plates and vertical connecting plate, vertical connecting plate passes through threaded fastener to be fixed on the external pipe box, first H shaped steel is fixed on the vertical connecting plate, two the one end of L shape connecting plate passes through threaded fastener fixed connection respectively at the link end of two frame posts, two the other end of L shape connecting plate passes through threaded fastener fixed connection respectively in the both sides terminal surface of first H shaped steel.
Further, the connecting plate also comprises a transverse connecting plate, and the transverse connecting plate is arranged on one side end face of the first H-shaped steel and one side end face of the second H-shaped steel and is fixed through a threaded fastener.
Furthermore, a triangular support plate is arranged on the L-shaped connecting plate.
Further, the L-shaped connecting plate is an L-shaped angle steel.
Further, shaped steel concrete spiral stirrup roof beam still includes concrete form and rectangle spiral stirrup, the concrete form sets up the rectangle spiral stirrup outside, second H shaped steel sets up in the rectangle spiral stirrup.
Furthermore, a cross-shaped steel is arranged in the frame column.
Further, the threaded fastener is a high-strength bolt.
Furthermore, four end faces of the external pipe sleeve are provided with steel reinforced concrete spiral stirrup beams which are connected through connecting members.
A method for installing a steel pipe constraint section steel recycled concrete column-beam assembled node comprises the following steps:
s1, prefabricated parts: welding a triangular support plate in the middle of the L-shaped angle steel, welding one end of first H-shaped steel with a vertical connecting plate, fixing second H-shaped steel in a rectangular spiral stirrup, pouring concrete to form a steel concrete spiral stirrup beam outside the rectangular spiral stirrup, exposing the second H-shaped steel and the rectangular spiral stirrup at the connecting end of the steel concrete spiral stirrup beam, respectively forming bolt holes in a frame column, an external pipe sleeve, the connecting plate, the first H-shaped steel, the U-shaped steel and the second H-shaped steel, and fixing the L-shaped angle steel on the side faces of two ends of the first H-shaped steel through high-strength bolts;
s2, connecting the frame columns: an external pipe sleeve is arranged between the connecting ends of the two frame columns, the cross-shaped steel penetrates through the two frame columns and the external pipe sleeve, the L-shaped steel is fixed on the frame columns through high-strength bolts, and the vertical connecting plate is fixed on the external pipe sleeve;
s3, connecting the section steel concrete spiral stirrup beam: butting second H-shaped steel with first H-shaped steel, embedding the U-shaped steel into grooves of the second H-shaped steel and the first H-shaped steel, fixedly connecting the U-shaped steel with the grooves through high-strength bolts, and fixing a transverse connecting plate on the second H-shaped steel and the first H-shaped steel;
s4, pouring the recycled concrete: and (4) after the section steel concrete spiral stirrup beams on the four end surfaces are connected, pouring recycled concrete at the connecting parts and the frame columns.
Has the advantages that: this shaped steel concrete spiral stirrup roof beam, frame post, external pipe box and connecting elements all can be prefabricated in advance in the mill and accomplish, transport the job site again and hoist and mount the connection, reduced the site operation degree of difficulty and numerous and diverse degree under the prerequisite of guaranteeing to connect the fastening nature, improved the efficiency of construction, adopt recycled concrete to pour into a mould and make the bulk rigidity big, and be favorable to the recycling of resource.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a connecting member installation according to an embodiment of the present invention;
FIG. 3 is a schematic view of the installation of the frame posts according to the embodiment of the present invention;
FIG. 4 is a schematic view of the installation of the steel reinforced concrete spiral stirrup beam according to the embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 4, an embodiment of the invention provides a steel pipe confined type steel recycled concrete column-beam assembled node, which mainly comprises two frame columns 1, an external pipe sleeve, a connecting member 2 and a steel reinforced concrete spiral stirrup beam 3. The external connecting pipe sleeve is arranged between the joints of the two frame columns 1. The connecting member 2 comprises a threaded fastener 205, a connecting plate, a first H-shaped steel 203 and a U-shaped steel 202, the connecting plate is fixed on the frame column 1 and the outer pipe sleeve through the threaded fastener 205, and the first H-shaped steel 203 is fixed on the connecting plate through the threaded fastener 205. In the steel reinforced concrete spiral stirrup beam 3, the second H-shaped steel 301 with the shape matched with that of the first H-shaped steel 203 is arranged in the steel reinforced concrete spiral stirrup beam 3, and the first H-shaped steel 203 is butted with the second H-shaped steel 301 and is fixedly butted with the second H-shaped steel through the U-shaped steel 202 and the threaded fastener 205. Specifically, the connecting end of two frame columns 1 is provided with first screw hole, and this external pipe sleeve is provided with the second screw hole, is provided with the first perforation that corresponds with first bolt hole and the second perforation that corresponds with the second bolt hole on this connecting plate, and this first screw hole, second screw hole all set up to one-way screw hole. The two frame columns 1 and the connecting plate are symmetrically and fixedly arranged by taking the external pipe sleeve as a central plane, so that the connecting member is simultaneously and fixedly connected with the frame columns 1 at the upper end and the lower end and the external pipe sleeve positioned between the frame columns 1 at the two ends, and the locking effect of the steel pipe constraint section steel recycled concrete column-beam assembly type node is ensured. This steel pipe restraint shaped steel regeneration concrete column-roof beam assembled node passes through the fastening of threaded fastener 205 cooperation first H shaped steel 203, second H shaped steel 301 and U shaped steel 202 and realizes the fastening connection of high strength, aligns the link edge of first H shaped steel 203 and second H shaped steel 301, arranges the U-shaped steel in the recess of first H shaped steel 203 and second H shaped steel 301 again, realizes fastening connection through threaded fastener 205, stable in structure and the installation of being convenient for. The second H-shaped steel 301 is arranged at the connecting end of the steel pipe restrained profile steel spiral stirrup beam 3, concrete is poured after the steel pipe restrained profile steel recycled concrete column-beam assembled node is installed, most components are prefabricated in a factory, and only field assembly is needed, so that the problem of complex beam column node construction is effectively solved, and the steel pipe restrained profile steel recycled concrete column-beam assembled node has the advantages of reasonable force transmission, convenience in construction, economy, reliability, good anti-seismic performance and the like.
Preferably, the connecting plate includes two L-shaped connecting plates 2011 and a vertical connecting plate 2012, the vertical connecting plate 2012 is fixed on the external pipe sleeve by a threaded fastener 205, the first H-shaped steel 203 is fixed on the vertical connecting plate 2012, one end of the two L-shaped connecting plates 2011 is respectively and fixedly connected to the connecting ends of the two frame columns 1 by the threaded fastener 205, and the other end of the two L-shaped connecting plates 2011 is respectively and fixedly connected to the end faces of the two sides of the first H-shaped steel 203 by the threaded fastener 205. Specifically, the thickness of the vertical connecting plate 2012 is the same as that of the L-shaped connecting plate 2011, the L-shaped connecting plates 2011 are arranged in an up-and-down symmetrical manner, and the connecting member 2 forms an outward extending bracket after being installed, so that welding is not needed, and the field construction is facilitated.
Preferably, the connecting plate further comprises a transverse connecting plate 2013, the transverse connecting plate 2013 is arranged on one side end face of the first H-shaped steel 203 and one side end face of the second H-shaped steel 301 and is fixed through a threaded fastener 205, the steel reinforced concrete spiral hooped beam 3 is fixed on the overhanging bracket through the transverse connecting plate 2013 and the U-shaped steel 202, and the connecting strength of the steel pipe constraint section steel recycled concrete column-beam assembly type node is guaranteed.
Preferably, a triangular support plate 204 is arranged on the L-shaped connecting plate 2011, so that the L-shaped connecting plate 2011 is more stable and reliable in structure.
Preferably, the L-shaped connecting plate 2011 is an L-shaped angle iron.
Preferably, the steel reinforced concrete spiral stirrup beam 3 further comprises a concrete template 302 and a rectangular spiral stirrup 303, wherein the concrete template 302 is arranged outside the rectangular spiral stirrup 303, and the second H-shaped steel 301 is arranged inside the rectangular spiral stirrup 303. Specifically, this shaped steel concrete spiral stirrup roof beam 3 is the prefab, and this concrete form 302 reserves to expose the section, and the partial spiral stirrup that is located the link promptly does not have the pouring concrete, pours after second H shaped steel 301 in this spiral stirrup and first H shaped steel 203 fastening connection again, and the whole construction of being convenient for, and reinforcing holistic stability.
Preferably, the frame column 1 is internally provided with a cross-shaped steel 4.
Preferably, the threaded fastener 205 is a high-strength bolt.
Preferably, the four end faces of the external pipe sleeve are provided with steel reinforced concrete spiral stirrup beams 3 and are connected through connecting members 2. Specifically, the frame column 1 and the external pipe sleeve are rectangular, and four end faces of the external pipe sleeve can be connected with the steel pipe constraint section steel recycled concrete column-beam assembly type node.
A method for installing a steel pipe constraint section steel recycled concrete column-beam assembled node comprises the following steps:
s1, prefabricated parts: welding a triangular support plate 204 in the middle of the L-shaped angle steel, welding one end of a first H-shaped steel 203 with a vertical connecting plate 2012, fixing a second H-shaped steel 301 in a rectangular spiral stirrup 303, pouring concrete outside the rectangular spiral stirrup 303 to form a steel concrete spiral stirrup beam 3, exposing the second H-shaped steel 301 and the rectangular spiral stirrup 303 at the connecting end of the steel concrete spiral stirrup beam 3, respectively forming bolt holes in the frame column 1, the external pipe sleeve, the connecting plate, the first H-shaped steel 203, the U-shaped steel 202 and the second H-shaped steel 301, and fixing the L-shaped angle steel on the side surfaces of two ends of the first H-shaped steel through high-strength bolts;
s2, connecting the frame columns: an external pipe sleeve is arranged between the connecting ends of the two frame columns 1, the cross-shaped steel 4 penetrates through the two frame columns 1 and the external pipe sleeve, the L-shaped steel is fixed on the frame columns 1 through high-strength bolts, and the vertical connecting plate 2012 is fixed on the external pipe sleeve;
s3, connecting the section steel concrete spiral stirrup beam: butting the second H-shaped steel 301 with the first H-shaped steel 203, embedding the U-shaped steel 202 into grooves of the second H-shaped steel 301 and the first H-shaped steel 203, fixedly connecting the grooves through high-strength bolts, and fixing the transverse connecting plate 2013 on the second H-shaped steel 301 and the first H-shaped steel 203;
s4, pouring the recycled concrete: and after the section steel concrete spiral stirrup beams 3 on the four end surfaces are connected, the recycled concrete at the joint and the frame column 1 is poured.
This shaped steel concrete spiral stirrup roof beam 3, frame post 1, external pipe box and connecting elements 2 all can be prefabricated in advance in the mill and accomplish, carry the job site again and hoist and connect, reduced the site operation degree of difficulty and numerous and diverse degree under the prerequisite of guaranteeing connection fastening nature, improved the efficiency of construction, adopt recycled concrete to pour into a mould and make the bulk rigidity big, and be favorable to the recycling of resource.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718949A (en) * | 2021-09-10 | 2021-11-30 | 重庆恒昇大业建筑科技集团有限公司 | Beam-column mixed frame joint structure and construction method thereof |
| CN114164952A (en) * | 2021-12-07 | 2022-03-11 | 广州大学 | An assembled section steel column-section steel beam joint with inner and outer steel sleeves |
| CN114197631A (en) * | 2021-12-07 | 2022-03-18 | 广州大学 | A high-rise prefabricated steel recycled concrete frame-core tube structure building system |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113718949A (en) * | 2021-09-10 | 2021-11-30 | 重庆恒昇大业建筑科技集团有限公司 | Beam-column mixed frame joint structure and construction method thereof |
| CN114164952A (en) * | 2021-12-07 | 2022-03-11 | 广州大学 | An assembled section steel column-section steel beam joint with inner and outer steel sleeves |
| CN114197631A (en) * | 2021-12-07 | 2022-03-18 | 广州大学 | A high-rise prefabricated steel recycled concrete frame-core tube structure building system |
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