KR20110061840A - Joint structure for hollow core concrete filled tube column and h shaped beam and construction method therefor - Google Patents

Joint structure for hollow core concrete filled tube column and h shaped beam and construction method therefor Download PDF

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Publication number
KR20110061840A
KR20110061840A KR1020090118355A KR20090118355A KR20110061840A KR 20110061840 A KR20110061840 A KR 20110061840A KR 1020090118355 A KR1020090118355 A KR 1020090118355A KR 20090118355 A KR20090118355 A KR 20090118355A KR 20110061840 A KR20110061840 A KR 20110061840A
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KR
South Korea
Prior art keywords
steel pipe
pipe column
shaped
column
joint
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KR1020090118355A
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Korean (ko)
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KR101076581B1 (en
Inventor
최성모
송경철
김영호
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서울시립대학교 산학협력단
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Priority to KR1020090118355A priority Critical patent/KR101076581B1/en
Publication of KR20110061840A publication Critical patent/KR20110061840A/en
Application granted granted Critical
Publication of KR101076581B1 publication Critical patent/KR101076581B1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/30Structures 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
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38Connections for building structures in general
    • E04B1/58Connections for building structures in general of bar-shaped building elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403Connection details of the elongated load-supporting parts
    • E04B2001/2415Brackets, gussets, joining plates

Abstract

PURPOSE: A joint structure of a hollow concrete filled double steel pipe column and an H-beam and a construction method thereof are provided to perform steel skeleton work quickly, to have no necessity of additionally fireproofing a column, and to improve resistance of a joint by securing the unification of a joint between a column and a beam. CONSTITUTION: A joint structure of a hollow concrete filled pipe steel tube column and an H-beam comprises an inner steel pipe column(10), plural H-brackets(20) jointed to the outer circumference of the inner steel pipe column, plural arc plates(30) connecting H-brackets and surrounding the inner steel pipe column, a ring plate(40) having the same diameter as the diameter formed by connecting arc-shaped plates and coupled to the upper part and the lower part of the arc-shaped plate respectively, an outer steel pipe column(50) coupled to each ring plate and surrounding the inner steel pipe column, concrete(60) placed between the inner steel pipe column and the outer steel pipe column, and, the inner steel pipe column, the H-bracket and the arc bracket, and an H-beam(70) joined to each H-bracket.

Description

Joint structure for hollow core concrete filled tube column and H shaped beam and construction method therefor}
The present invention relates to a joint structure of a column and a beam and a construction method, and more specifically, a hollow concrete-filled double steel pipe column filled with concrete between an inner steel pipe and an outer steel pipe of a double steel pipe composed of an inner steel pipe and an outer steel pipe; It relates to a joint structure of H-beams and a construction method thereof.
Steel structure buildings are made by connecting and assembling individual members such as columns, beams, and braces. No matter how sturdy the individual members are, if the connections are weak, the entire building will not be safe. The joints shall be capable of sufficiently transmitting the stress of each member to which they are connected. Depending on how the joints are designed and constructed, the impact on structural safety as well as the cost of the structure is greatly affected.
Column and beam joints can be divided into steel joints and pin joints, but generally steel joints. In the case of pin joints, high-strength bolts are used, and in the case of steel joints, welding is common. In the case of welded joint, the plate of column can be deformed out of plane due to the stress of beam flange. To prevent this, horizontal stiffener should be installed and reinforced at the position where beam is joined. When the column cross section is a square steel pipe or a round steel pipe, the details of the beam-column joint are somewhat complicated. There are a through diaphragm type, an internal diaphragm type, and an external diaphragm type depending on the type of diaphragm.
Concrete filled steel pipe structure is known to be suitable for high-rise structural system with excellent structural performance by interaction between steel pipe and concrete. However, due to the difficulties in identifying and constructing the dynamic behavior of concrete-filled column-H-beam connections, various joint types are being studied. Through type diaphragm type and internal type diaphragm type are known to be suitable for high-rise buildings and are widely used in Japan.However, since Korea has relatively low earthquake and wind loads, the welding type can be used in construction when the through type and internal type diaphragm joint type is applied as it is. And inefficient aspects such as concrete fillability. In addition, it is pointed out the disadvantages such as inconsistency due to the manufacture and processing of the external diaphragm type and the complexity of the appearance around the joint.
The present invention is capable of rapid construction of steel frame construction, there is no need to separately fireproof coating on the pillar, hollow concrete-filled double steel pipe column and H-shaped steel with improved joint strength by securing the integrity of the joint of the column and beam An object of the present invention is to provide a beam joint structure and a construction method.
According to a preferred embodiment of the present invention, there is provided an internal steel pipe column; A plurality of H-shaped brackets joined to the outer circumferential surface of the inner steel pipe column; A plurality of arc-shaped plates surrounding the inner steel pipe column while connecting the H-shaped brackets to each other; A ring plate having a diameter equal to the diameter of the circular plate connected to each other and coupled to the upper and lower portions of the arc-shaped plate; An outer steel pipe column coupled to each ring plate and surrounding the inner steel pipe column; Concrete filled between the inner steel pipe column and the outer steel pipe column and between the inner steel pipe column and the H-shaped bracket and the arc-shaped plate; And it is provided a joint structure of the hollow concrete-filled double steel pipe column and H-shaped steel beam comprising an H-beam that is bonded to each H-shaped bracket.
According to another suitable embodiment of the present invention, the method comprises the steps of: installing, according to a plan, an inner steel pipe column to which an H-shaped bracket, an arc-shaped plate, and a ring plate are joined; Bonding the H beam to the H bracket; Installing an outer steel pipe pillar to surround the inner steel pipe pillar; And filling the concrete between the inner steel pipe pillar and the outer steel pipe pillar and the inner steel pipe pillar and the space enclosed by the H-shaped bracket and the arc-shaped plate. Construction methods are provided.
According to the present invention, there is no need for a separate fireproof coating on the pillar, and the integrity of the pillar-beam joint is secured, thereby improving the performance of the joint.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components or parts are denoted by the same reference numerals as much as possible, and detailed descriptions of related known functions or configurations are omitted.
1 is an exploded view showing the joint structure of the hollow concrete filled double steel pipe pillar and H-beams according to the present invention, Figure 2 is a longitudinal cross-sectional view of the junction of the hollow concrete filled double steel pipe pillar and H-beams, (A) is sectional drawing (AA sectional drawing of FIG. 2) of the part to which the beam was joined, (b) is sectional drawing (BB sectional drawing of FIG. 2) of a pillar part.
As shown in FIG. 1, the joint structure of the hollow concrete filled double steel pipe pillar and H-shaped steel beam according to the present invention includes four H-shaped brackets 20 joined to the outer circumferential surfaces of the inner steel pipe pillar 10 and the inner steel pipe pillar 10. ), The four arc-shaped plates (Arc plate, 30) surrounding the inner steel pipe column (10) while connecting the H-shaped bracket (20) and the circular plate (30) has the same diameter as the diameter formed by the circular arc type Two ring plates 40 respectively coupled to the upper and lower portions of the plate 30, outer steel pipe columns 50 and inner steel pipe columns 10 coupled to each ring plate 40 and surrounding the inner steel pipe columns 10. H-shaped steel joined to the concrete 60 and each H-shaped bracket 20 filled between the outer and outer steel pipe pillars 50 and between the inner steel pipe pillars 10 and the H-bracket 20 and the arc-shaped plate 30. Made of a beam 70.
The inner steel pipe column 10 is a member that forms the main pillar of the steel frame frame made of steel pipe column-H-beams and is surrounded by an outer steel pipe column 50 and covered with concrete 60.
The H-shaped bracket 20 is joined to the inner steel pipe column 10 at the position where the H-beam 70 is to be joined. That is, the H-shaped bracket 20 has the same cross section as the H-beams 70 joined by being welded to the outer circumferential surface of the inner steel pipe column 10 to join the H-beams 70. In FIG. 1, when the H-beam 70 is joined to the inner steel pipe column 10 in a cross shape, that is, the inner steel pipe column 10 is installed in the center, four H-shaped brackets 20 are installed. . However, the present invention is not limited thereto, and three or two outer pillars may be installed depending on the number of beams 70 joined to the pillars 10.
The arc-shaped plate 30 is installed to surround the inner steel pipe pillar 10 while connecting the bracket 20 to each other. The diameter of the arc-shaped plate 30 surrounding the inner steel pipe column 10 has the same diameter as that of the ring plate 40 and the outer steel pipe column 50. Therefore, when the concrete 60 is filled between the inner steel pipe column 10 and the outer steel pipe column 50, the concrete inside the space surrounded by the inner steel pipe column 10, the H-type bracket 20 and the arc-shaped plate 30 60 will be filled. To this end, both ends of the arc-shaped plate 30 are formed between the upper flange and the lower flange of the H-shaped bracket 20 and a closed end 31 having a size in contact with the web is formed. The closed end 31 is joined to the upper flange and the lower flange of the H-type bracket 20 by welding to function as a stiffener to prevent out-of-plane deformation of the H-type bracket 20.
On the same vertical line as the arc-shaped plate 30, the ring plate 40 having the same diameter as that of the circle formed by the arc-shaped plate 30 is connected is joined. The ring plate 40 allows the external steel pipe column 50 to be easily connected in the field.
The outer steel pipe pillar 50 is installed to surround the inner steel pipe pillar 10. The outer steel pipe column 50 has the same diameter as the ring plate 40 and is joined to the ring plate 40. The H-bracket 20, the arc-shaped plate 30 and the ring plate 40 are joined to the inner steel pipe column 10 in advance at the factory, whereas the outer steel pipe column 50 sets up the inner steel pipe column 10 and It is constructed after joining the section beams 70 to build a frame. Therefore, the outer steel pipe pillar 50 is divided into at least two and connected to each other by welding in the field to surround the inner steel pipe pillar (10). The outer steel pipe column 50 serves as a formwork for placing concrete 60, and together with the inner steel pipe column 10 constitutes a hollow concrete filled double steel pipe column.
Concrete 60 is filled between the inner steel pipe column 10 and the outer steel pipe column 50 and in a space surrounded by the inner steel pipe column 10 and the H-shaped bracket 20 and the arc-shaped plate 30. Therefore, as shown in FIG. 3 (a), the joint of the column and the beam is integrated with concrete, and in FIG. 3 (b) and the inner steel pipe column 10 is covered by the concrete 60 to prevent the internal steel pipe column ( It becomes a fireproof structure which can suppress the temperature rise of 10).
The H-beam 70 is joined to the H-shaped bracket 20. Bonding between the H-shaped bracket 20 and the H-beams 70 can be optionally used any bonding method known in the art.
Figures 4a to 4d shows the construction method of the joint of the hollow concrete filled double steel pipe pillar and H-shaped steel beam in accordance with the present invention in order.
First, the H-shaped bracket 20, the arc-shaped plate 30 and the ring plate 40 is bonded to the inner steel pipe column (10). H-bracket 20, arc-shaped plate 30, and ring plate 40 at the position where the H-beams are to be joined, respectively, when the inner steel pipe column 10 is the first-tier one-section type, and the two-layer one-section type. ). In the figure, the case of the one-layer one-section system is shown. Bonding the H-shaped bracket 20, the arc-shaped plate 30 and the ring plate 40 to the inner steel pipe column 10 may be carried out in the field, but is preferably performed in advance in the factory.
Next, as shown in FIG. 4a, the inner steel pipe column 10 to which the H-shaped bracket 20, the arc-shaped plate 30, and the ring plate 40 are joined is installed according to a plan.
Next, the H-beam beam 70 is bonded to the inner steel pipe column 10 as shown in Figure 4b to complete the frame.
Next, as shown in FIG. 4c, the outer steel pipe pillar 50 is installed to surround the inner steel pipe pillar 10. The outer steel pipe column 50 is connected to the ring plate 40 bonded to the inner steel pipe column 10. At this time, a vertical reinforcing bar may be additionally disposed between the outer steel pipe column 50 and the inner steel pipe column 10.
Finally, the concrete 60 is filled in the space between the inner steel pipe pillar 10 and the outer steel pipe pillar 50 as shown in FIG. 4D. At this time, the concrete 60 is tightly filled even in the space surrounded by the inner steel pipe column 10, the H-bracket 20 and the arc-shaped plate 30.
As described above, according to the present invention, the first construction of the frame consisting of the inner steel pipe column 10 and the H-beam steel 70 can be carried out rapidly during the construction while the load is received by the inner steel pipe column (10). Rather, the column-beam joint becomes a steel concrete structure, thereby increasing the integrity of the joint, thereby improving the performance of the joint. And since the ring plate 40 is bonded to the inner steel pipe column 10 in advance, the outer steel pipe column 50 serving as a formwork for pouring concrete covering the inner steel pipe column 10 can be easily combined in the field. . As the inner steel pipe pillar is covered with concrete, it is possible to realize a fireproof structure that can suppress the temperature rise of the inner steel pipe pillar in case of fire, and the pillar is composed of the inner steel pipe pillar, concrete and the outer steel pipe pillar, thereby improving the strength and buckling performance of the pillar. It can greatly improve. That is, according to the present invention, there is no need for a separate fireproof coating on the column, and the integrity of the column-beam joint is secured, thereby improving the performance of the joint.
Although the present invention has been described with reference to the drawings illustrating the present invention, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Can be done.
The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is an exploded view showing the joint structure of the hollow concrete-filled double steel pipe pillar and H-shaped steel beam according to the present invention.
Figure 2 is a longitudinal sectional view of the joint of the hollow concrete filled double steel tube column and H-beams.
(A) is sectional drawing (A-A sectional drawing of FIG. 2) of the part to which the beam was joined, (b) is sectional drawing (B-B sectional drawing of FIG. 2) of a pillar part.
Figures 4a to 4d shows the construction method of the joint of the hollow concrete filled double steel pipe pillar and H-shaped steel beam in accordance with the present invention in order.

Claims (2)

  1. Internal steel pipe column (10);
    A plurality of H-shaped brackets 20 joined to the outer circumferential surface of the inner steel pipe column 10;
    A plurality of arc-shaped plates 30 surrounding the inner steel pipe pillars 10 while connecting the H-shaped brackets 20 to each other;
    A ring plate 40 having a diameter equal to the diameter of the circular plate 30 connected to each other and coupled to the upper and lower portions of the arc-shaped plate 30;
    An outer steel pipe column 50 coupled to each ring plate 40 and surrounding the inner steel pipe column 10;
    Concrete 60 filled between the inner steel pipe pillar 10 and the outer steel pipe pillar 50 and between the inner steel pipe pillar 10 and the H-shaped bracket 20 and the arc-shaped plate 30; And
    Joint structure of the hollow concrete filled double steel pipe column and H-shaped steel beam, characterized in that it comprises an H-beam steel 70 is joined to each H-shaped bracket (20).
  2. Installing the inner steel pipe column (10) to which the H-shaped bracket (20), the arc-shaped plate (30) and the ring plate (40) are joined according to the plan;
    Bonding the H-beams 70 to the H-bracket 20;
    Installing the outer steel pipe pillar 50 to surround the inner steel pipe pillar 10; And
    Filling the concrete 60 between a space between the inner steel pipe column 10 and the outer steel pipe column 50 and between the inner steel pipe column 10 and the H-shaped bracket 20 and the arc-shaped plate 30. Hollow concrete filled double steel pipe column and H-beam joint construction method.
KR1020090118355A 2009-12-02 2009-12-02 Joint structure for hollow core concrete filled tube column and H shaped beam and construction method therefor KR101076581B1 (en)

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CN102535648A (en) * 2012-03-07 2012-07-04 中国建筑第八工程局有限公司 Steel pipe column ring beam column node structure and construction method thereof
CN102619286A (en) * 2012-04-26 2012-08-01 中国瑞林工程技术有限公司 Connecting joint of steel pipe concrete column and profile steel concrete beam
CN102936924A (en) * 2012-11-08 2013-02-20 沈阳建筑大学 Girder embedding ribbed through partition square concrete filled steel tube column-H-shaped girder combination nodes
CN103046751A (en) * 2012-12-04 2013-04-17 中建三局建设工程股份有限公司 Binding construction method of steel pipe column ring beam reinforcing bars
WO2014053070A1 (en) 2012-10-02 2014-04-10 Douet Laurence Construction kit for forming a support structure
KR101445799B1 (en) * 2012-04-06 2014-10-01 삼성물산(주) Skip-floor Construction Method Using The Improved Semi-concrete filled tube Column Structure
CN104120797A (en) * 2014-08-05 2014-10-29 北方工业大学 Composite concrete-filled steel tube outer ring plate beam column connecting node
CN104120796A (en) * 2014-08-05 2014-10-29 北方工业大学 Composite concrete-filled steel tube ribbing outer ring plate beam column connecting node
CN104947712A (en) * 2015-06-29 2015-09-30 上海建工四建集团有限公司 Construction method of constructing beam-column joint using ring beam
CN104963415A (en) * 2015-06-18 2015-10-07 长安大学 Circular steel tube constraint type steel concrete column and steel beam node structure
CN105332510A (en) * 2015-11-12 2016-02-17 徐仁贵 Construction method of complicated beam column joint core area
CN105525688A (en) * 2016-01-07 2016-04-27 杭州铁木辛柯钢结构设计有限公司 Oppositely penetrating steel bar and oppositely penetrating vertical insert plate type beam column two-way rigid joint
CN105544742A (en) * 2016-02-22 2016-05-04 华北理工大学 Side column node connection structure of fabricated circular steel tube concrete special-shaped column and construction method of side column node connection structure
CN105672491A (en) * 2016-01-20 2016-06-15 重庆大学 Circular steel tube constraining reinforced concrete-steel beam framework node for nodal-region composite steel tube
CN105804255A (en) * 2016-05-17 2016-07-27 福建工程学院 Assembling structure for prefabricated concrete beam and composite steel pipe concrete column, and construction method for assembling structure
CN106320374A (en) * 2016-08-31 2017-01-11 中铁二十局集团第四工程有限公司 Steel pipe column for subway station and construction process of steel pipe column
KR20190041276A (en) * 2017-10-12 2019-04-22 한국교통대학교산학협력단 Thrust Structure Using Double Steel Tube and Construction Method Therefor
CN110439125A (en) * 2019-08-01 2019-11-12 中交一航局第一工程有限公司 Girder connection form technology

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CN102535648A (en) * 2012-03-07 2012-07-04 中国建筑第八工程局有限公司 Steel pipe column ring beam column node structure and construction method thereof
CN102535648B (en) * 2012-03-07 2014-10-15 中国建筑第八工程局有限公司 Steel pipe column ring beam column node structure and construction method thereof
KR101445799B1 (en) * 2012-04-06 2014-10-01 삼성물산(주) Skip-floor Construction Method Using The Improved Semi-concrete filled tube Column Structure
CN102619286A (en) * 2012-04-26 2012-08-01 中国瑞林工程技术有限公司 Connecting joint of steel pipe concrete column and profile steel concrete beam
WO2014053070A1 (en) 2012-10-02 2014-04-10 Douet Laurence Construction kit for forming a support structure
CH707053A1 (en) * 2012-10-02 2014-04-15 Douet Laurence Kit for forming a supporting structure.
CN102936924A (en) * 2012-11-08 2013-02-20 沈阳建筑大学 Girder embedding ribbed through partition square concrete filled steel tube column-H-shaped girder combination nodes
CN103046751A (en) * 2012-12-04 2013-04-17 中建三局建设工程股份有限公司 Binding construction method of steel pipe column ring beam reinforcing bars
CN103046751B (en) * 2012-12-04 2015-11-25 中建三局集团有限公司 Steel pipe column ring beam reinforcing bar binding construction method
CN104120796A (en) * 2014-08-05 2014-10-29 北方工业大学 Composite concrete-filled steel tube ribbing outer ring plate beam column connecting node
CN104120797A (en) * 2014-08-05 2014-10-29 北方工业大学 Composite concrete-filled steel tube outer ring plate beam column connecting node
CN104963415A (en) * 2015-06-18 2015-10-07 长安大学 Circular steel tube constraint type steel concrete column and steel beam node structure
CN104947712A (en) * 2015-06-29 2015-09-30 上海建工四建集团有限公司 Construction method of constructing beam-column joint using ring beam
CN105332510A (en) * 2015-11-12 2016-02-17 徐仁贵 Construction method of complicated beam column joint core area
CN105525688A (en) * 2016-01-07 2016-04-27 杭州铁木辛柯钢结构设计有限公司 Oppositely penetrating steel bar and oppositely penetrating vertical insert plate type beam column two-way rigid joint
CN105525688B (en) * 2016-01-07 2019-03-08 杭州铁木辛柯钢结构设计有限公司 To wearing rod iron and to wearing the perpendicular two-way rigid joint of board plug type beam column
CN105672491B (en) * 2016-01-20 2018-01-30 重庆大学 The construction method of the round steel pipe constraint armored concrete steel girder frame node of the compound steel pipe in node area
CN105672491A (en) * 2016-01-20 2016-06-15 重庆大学 Circular steel tube constraining reinforced concrete-steel beam framework node for nodal-region composite steel tube
CN105544742A (en) * 2016-02-22 2016-05-04 华北理工大学 Side column node connection structure of fabricated circular steel tube concrete special-shaped column and construction method of side column node connection structure
CN105804255A (en) * 2016-05-17 2016-07-27 福建工程学院 Assembling structure for prefabricated concrete beam and composite steel pipe concrete column, and construction method for assembling structure
CN105804255B (en) * 2016-05-17 2018-02-23 福建工程学院 Precast concrete beam and composite steel tube concrete column assembling structure and its construction method
CN106320374A (en) * 2016-08-31 2017-01-11 中铁二十局集团第四工程有限公司 Steel pipe column for subway station and construction process of steel pipe column
CN106320374B (en) * 2016-08-31 2019-10-11 中铁二十局集团第四工程有限公司 A kind of subway station steel pipe column and its construction technology
KR20190041276A (en) * 2017-10-12 2019-04-22 한국교통대학교산학협력단 Thrust Structure Using Double Steel Tube and Construction Method Therefor
CN110439125A (en) * 2019-08-01 2019-11-12 中交一航局第一工程有限公司 Girder connection form technology

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