CN105089204A - Cold-formed thin-walled ribbed U-shaped steel-encased concrete laminated slab composite beam - Google Patents
Cold-formed thin-walled ribbed U-shaped steel-encased concrete laminated slab composite beam Download PDFInfo
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Abstract
一种冷弯薄壁带肋U型外包钢-混凝土叠合板组合梁，它属于一种组合梁，以解决现浇钢筋混凝土梁板需要大量的模板，施工周期长，生产难于实现工业化的问题。它包括下部的冷弯薄壁带肋U型钢梁，预制混凝土板，以及通长纵向钢筋骨架，折线形拉结筋和混凝土；冷弯薄壁带肋U型钢梁具有底板、两块腹板以及两个内卷翼缘板，翼缘板上设计有排气孔；混凝土预制底板设置于带肋U型钢梁的上翼缘，在混凝土预制底板的面层、端部条形通孔和带肋U型钢梁内浇注混凝土。本发明构造简单，抗火性能及整体稳定性好，组合作用强，且施工方便快捷，可实现产业化生产，经济效益显著，可用于土木工程建筑的楼盖结构中。
A cold-formed thin-walled ribbed U-shaped outer-clad steel-concrete composite slab composite beam, which belongs to a composite beam, solves the problems that cast-in-place reinforced concrete beams and slabs require a large number of formwork, the construction period is long, and the production is difficult to achieve industrialization. . It includes cold-formed thin-walled ribbed U-shaped steel beams at the lower part, prefabricated concrete slabs, and full-length longitudinal steel skeletons, broken-line tie bars and concrete; cold-formed thin-walled ribbed U-shaped steel beams have a bottom plate, two webs slab and two inwardly rolled flange panels, and the flange panels are designed with air vents; the concrete prefabricated bottom slab is set on the upper flange of the ribbed U-shaped steel beam, and the surface layer and end strip-shaped through holes of the concrete prefabricated bottom slab and ribbed U-shaped steel beams are poured with concrete. The invention has the advantages of simple structure, good fire resistance and overall stability, strong combination effect, convenient and fast construction, can realize industrialized production, and has remarkable economic benefits, and can be used in floor structures of civil engineering buildings.
Description
技术领域technical field
本发明涉及一种组合梁，具体涉及一种冷弯薄壁带肋U型外包钢-混凝土叠合板组合梁，属于建筑结构技术领域。The invention relates to a composite beam, in particular to a cold-formed thin-wall ribbed U-shaped composite beam covered with steel-concrete laminated plates, which belongs to the technical field of building structures.
背景技术Background technique
外包钢-混凝土组合梁因其能充分发挥钢材抗拉和混凝土抗压的性能，并且具有刚度大，稳定性好等优点，在实际工程中得到大量应用。为了保证有足够的钢筋用于承担钢梁下部所受拉力，外包钢的底板厚度通常大于腹板和翼缘的厚度，底板和腹板之间通过焊接连接。而为了保证组合梁在火灾情况下仍然具有一定的承载力，组合梁一般需布置额外的防火构造钢筋。采用现浇板的外包钢组合梁，虽然现浇板的整体性好，抗震性能好，但是需要大量的模板，施工周期长，生产难于实现工业化。Outer-clad steel-concrete composite beams have been widely used in practical engineering because they can give full play to the tensile properties of steel and the compressive properties of concrete, and have the advantages of high rigidity and good stability. In order to ensure that there are enough steel bars to bear the tensile force on the lower part of the steel beam, the thickness of the bottom plate of the outsourcing steel is usually greater than the thickness of the web and flange, and the bottom plate and web are connected by welding. In order to ensure that the composite beam still has a certain bearing capacity in the case of fire, the composite beam generally needs to arrange additional fireproof structural reinforcement. The cast-in-place slab-clad steel composite girder, although the cast-in-place slab has good integrity and good seismic performance, requires a large number of formwork, the construction period is long, and the production is difficult to achieve industrialization.
经文献检索，现有技术中有一种外包钢-混凝土组合梁，该组合梁采用冷弯C型花纹钢梁，梁肋内未放置抗火或纵向受力钢筋，钢梁上翼缘也没有设置拉条。施工时如果不加设梁底模板，钢梁容易发生畸变屈曲。使用阶段如果遇到火灾，组合梁的承载力将得不到保证。冷弯薄壁C型钢梁上翼缘的切片因其抗剪承载力较低，不易保证钢梁与混凝土完全协同工作。现有技术中还有一种U形钢-混凝土组合梁，当采用预制混凝土板时，为保证施工中组合梁U形钢外伸翼缘的承载力，需要在翼缘下部设置支撑，而采用混凝土现浇板，则需要大量模板；作为抗剪件的角钢需要的焊接量比较大，悬空放置的纵向受力钢筋在施工阶段不能提高U型钢梁的抗弯刚度。According to literature search, there is an outsourcing steel-concrete composite beam in the prior art. The composite beam adopts cold-formed C-shaped checkered steel beam. There is no fire-resistant or longitudinal force-bearing steel bar in the beam rib, and there is no tensile steel bar on the upper flange of the steel beam. strip. If the beam bottom formwork is not added during construction, the steel beam is prone to distortion and buckling. If there is a fire during the use stage, the bearing capacity of the composite beam will not be guaranteed. The slice of the upper flange of the cold-formed thin-walled C-shaped steel beam is not easy to ensure the complete cooperation between the steel beam and the concrete due to its low shear bearing capacity. There is also a U-shaped steel-concrete composite beam in the prior art. When prefabricated concrete slabs are used, in order to ensure the bearing capacity of the U-shaped steel overhanging flange of the composite beam during construction, it is necessary to set a support at the lower part of the flange, and the concrete Cast-in-place slabs require a large number of formworks; the angle steel required as a shear part requires a relatively large amount of welding, and the longitudinally stressed reinforcement placed in the air cannot improve the bending stiffness of the U-shaped steel beam during the construction stage.
发明内容Contents of the invention
本发明的目的是解决U形钢-混凝土组合梁施工时需要在外伸翼缘下部设置支撑，厚底板和腹板需要采用焊缝连接，费工，施工周期长，且纵向受力钢筋在施工阶段发挥不了作用，以及冷弯薄壁外包钢-混凝土组合梁的承载力较低，火灾情况下难以保证安全，施工时如果需加设梁底模板的问题。The purpose of the present invention is to solve the problem that the U-shaped steel-concrete composite beam needs to be supported at the lower part of the outrigger flange, and the thick bottom plate and the web need to be connected by welds, which is labor-intensive and has a long construction period. It can’t play a role, and the cold-formed thin-walled steel-concrete composite beam has a low bearing capacity, and it is difficult to ensure safety in the event of a fire. If it is necessary to add a beam bottom formwork during construction.
为实现本发明目的而采用的技术方案是这样的，一种冷弯薄壁带肋U型外包钢-混凝土叠合板组合梁，其特征在于：包括冷弯薄壁带肋U型钢梁、通长纵向受力钢筋、折线形连接钢筋、钢筋混凝土预制底板、以及纵向钢筋、横向钢筋和混凝土。The technical solution adopted to realize the purpose of the present invention is as follows, a cold-formed thin-walled ribbed U-shaped external steel-concrete composite plate composite beam is characterized in that it includes cold-formed thin-walled ribbed U-shaped steel beams, Longitudinal longitudinal stress reinforcement, broken-line connection reinforcement, reinforced concrete prefabricated bottom slab, longitudinal reinforcement, transverse reinforcement and concrete.
所述冷弯薄壁带肋U型钢梁下端封闭、上端敞口。所述冷弯薄壁带肋U型钢梁的上端敞口的两侧具有卷边。所述卷边上具有若干排气孔。The lower end of the cold-formed thin-walled ribbed U-shaped steel beam is closed and the upper end is open. The two sides of the upper open end of the cold-formed thin-walled ribbed U-shaped steel beam have curling edges. There are several vent holes on the curling edge.
所述折线形连接钢筋被焊接在冷弯薄壁带肋U型钢梁的上端的两侧卷边。The broken-line connecting steel bar is welded on both sides of the upper end of the cold-formed thin-walled ribbed U-shaped steel beam.
所述钢筋混凝土预制底板搁置在所述冷弯薄壁带肋U型钢梁的上方。所述钢筋混凝土预制底板是由相互平行的纵筋、以及浇筑在这些纵筋中的混凝土组成的。所述钢筋混凝土预制底板的中间具有条形通孔。这个条形通孔中仅仅有纵筋通过，而没有浇筑混凝土。这个条形通孔位于所述冷弯薄壁带肋U型钢梁的上端敞口的上方。The reinforced concrete prefabricated base plate rests on the cold-formed thin-walled ribbed U-shaped steel beam. The reinforced concrete prefabricated bottom plate is composed of mutually parallel longitudinal bars and concrete poured in these longitudinal bars. There is a strip-shaped through hole in the middle of the reinforced concrete prefabricated bottom plate. Only longitudinal bars pass through this strip-shaped through hole without pouring concrete. The strip-shaped through hole is located above the upper opening of the cold-formed thin-walled ribbed U-shaped steel beam.
所述钢筋混凝土预制底板的面层铺设若干相互平行的纵向钢筋，以及若干相互平行的横向钢筋。在钢筋混凝土预制底板的面层和冷弯薄壁带肋U型钢梁的空腔内整体浇筑混凝土。The surface layer of the reinforced concrete prefabricated floor is laid with several longitudinal reinforcements parallel to each other and several transverse reinforcements parallel to each other. Concrete is integrally poured in the surface layer of the reinforced concrete prefabricated bottom slab and in the cavity of the cold-formed thin-walled ribbed U-shaped steel beam.
进一步，若干根相互平行的所述通长纵向受力钢筋位于冷弯薄壁带肋U型钢梁的内腔之中，与冷弯薄壁带肋U型钢梁的底板连接在一起。Further, the plurality of longitudinally stressed steel bars parallel to each other are located in the inner cavity of the cold-formed thin-walled ribbed U-shaped steel beam, and are connected with the bottom plate of the cold-formed thin-walled ribbed U-shaped steel beam.
进一步，所述冷弯薄壁带肋U型钢梁采用薄壁钢板冷弯制成，钢板内表面可布设花纹也可没有花纹。带肋U型钢梁由Q235钢材、Q345钢材、Q390钢材或Q420或Q460钢材制成。Furthermore, the cold-formed thin-walled ribbed U-shaped steel beam is made of cold-formed thin-walled steel plate, and the inner surface of the steel plate may or may not have a pattern. The ribbed U-shaped steel beam is made of Q235 steel, Q345 steel, Q390 steel or Q420 or Q460 steel.
进一步，所述纵向受力钢筋采用HRB335钢筋、HRB400钢筋或RRB400钢筋制成，并焊接在冷弯薄壁带肋U型钢梁的底板上。Further, the longitudinally stressed steel bar is made of HRB335 steel bar, HRB400 steel bar or RRB400 steel bar, and is welded on the bottom plate of the cold-formed thin-walled ribbed U-shaped steel beam.
进一步，所述折线形连接钢筋采用HPB300钢筋、HRB335钢筋、HRB400钢筋或RRB400钢筋制成。Further, the zigzag connecting steel bar is made of HPB300 steel bar, HRB335 steel bar, HRB400 steel bar or RRB400 steel bar.
进一步，所述混凝土预制底板可采用普通钢筋混凝土预制板、预应力混凝土预制板或PK预应力混凝土楼板。Further, the concrete prefabricated floor can adopt ordinary reinforced concrete prefabricated slab, prestressed concrete prefabricated slab or PK prestressed concrete floor slab.
进一步，所述纵向钢筋和横向钢筋由HPB300钢筋、HRB335钢筋、HRB400钢筋或RRB400钢筋制成。Further, the longitudinal reinforcement and the transverse reinforcement are made of HPB300 reinforcement, HRB335 reinforcement, HRB400 reinforcement or RRB400 reinforcement.
进一步，所述混凝土为C25-C80普通混凝土、轻骨料混凝土、高性能混凝土或再生混凝土。Further, the concrete is C25-C80 ordinary concrete, lightweight aggregate concrete, high performance concrete or recycled concrete.
本发明的技术效果是毋庸置疑的：Technical effect of the present invention is beyond doubt:
1、在冷弯薄壁带肋U型钢的底板上焊接通长受力钢筋，可以形成具有较大刚度的底板，与腹板一起承受施工荷载。受力纵筋可兼做抗火钢筋，不但可以避免防火涂料的使用，节约了材料和大量人力，而且还可以减少钢筋用量。1. Welding full-length reinforced steel bars on the base plate of cold-formed thin-walled ribbed U-shaped steel can form a base plate with greater rigidity, which can bear construction loads together with the web. The stressed longitudinal bars can also be used as fire-resistant steel bars, which not only avoids the use of fire-resistant coatings, saves materials and a lot of manpower, but also reduces the amount of steel bars used.
2、冷弯薄壁带肋U型钢梁上部的折线形拉结钢筋可以提高开口带肋U型钢梁的整体稳定性，加大现浇混凝土与钢梁之间的粘结力，提高上部混凝土板与钢梁翼缘之间的纵向抗剪能力。2. The broken-line tie bars on the upper part of the cold-formed thin-walled ribbed U-shaped steel beam can improve the overall stability of the open ribbed U-shaped steel beam, increase the bonding force between the cast-in-place concrete and the steel beam, and improve the upper Longitudinal shear capacity between concrete slab and steel beam flange.
3、带肋U型钢梁上预留的排气孔可以保证U型钢梁内凹角的混凝土填充密实。3. The vent hole reserved on the ribbed U-shaped steel beam can ensure that the concrete filling in the concave corner of the U-shaped steel beam is dense.
4、采用叠合板和冷弯薄壁带肋U型钢可以解决现浇钢筋混凝土梁板需要使用大量模板，施工周期长的问题。预制混凝土底板可在工厂制作，冷弯薄壁型带肋U型钢及通长受力钢筋也可在工厂制作并焊接，易于保证质量，实现生产的工业化，经济效益好。4. The use of laminated slabs and cold-formed thin-walled ribbed U-shaped steel can solve the problem that a large number of formwork is required for cast-in-place reinforced concrete beam slabs and the construction period is long. The prefabricated concrete floor can be made in the factory, and the cold-formed thin-walled ribbed U-shaped steel and the full-length stress steel bar can also be made and welded in the factory, which is easy to guarantee the quality, realizes the industrialization of production, and has good economic benefits.
附图说明Description of drawings
图1是冷弯薄壁带肋U型外包钢—混凝土叠合板组合梁的断面图。Figure 1 is a cross-sectional view of a cold-formed thin-walled ribbed U-shaped steel-concrete composite slab composite beam.
图2是冷弯薄壁带肋U型外包钢—混凝土叠合板组合梁的带肋U型钢梁及其配筋构造示意图。Figure 2 is a schematic diagram of the ribbed U-shaped steel beam and its reinforcement structure of the cold-formed thin-walled ribbed U-shaped outsourcing steel-concrete composite slab composite beam.
图中：1为冷弯薄壁带肋U型钢梁；2为通长纵向受力钢筋；3为排气孔；4为折线形连接钢筋；5为钢筋混凝土预制板；6为纵向钢筋；7为横向钢筋；8为混凝土；9为钢筋混凝土预制板内纵筋。In the figure: 1 is a cold-formed thin-walled ribbed U-shaped steel beam; 2 is a full-length longitudinal reinforced steel bar; 3 is an air vent; 4 is a broken line connecting steel bar; 5 is a reinforced concrete prefabricated slab; 6 is a longitudinal steel bar; 7 is the horizontal reinforcement; 8 is the concrete; 9 is the longitudinal reinforcement in the reinforced concrete prefabricated slab.
具体实施方式Detailed ways
下面结合附图和实施例对本发明作进一步说明，但不应该理解为本发明上述主题范围仅限于下述实施例。在不脱离本发明上述技术思想的情况下，根据本领域普通技术知识和惯用手段，做出各种替换和变更，均应包括在本发明的保护范围内。The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.
一种冷弯薄壁带肋U型外包钢-混凝土叠合板组合梁，包括冷弯薄壁带肋U型钢梁1、通长纵向受力钢筋2、折线形连接钢筋4、钢筋混凝土预制底板5、以及纵向钢筋6、横向钢筋7、混凝土8以及钢筋混凝土预制板内纵筋9。A cold-formed thin-walled ribbed U-shaped outsourcing steel-concrete composite slab composite beam, comprising a cold-formed thin-walled ribbed U-shaped steel beam 1, a full-length longitudinal stressed steel bar 2, a broken-line connecting steel bar 4, and prefabricated reinforced concrete Bottom plate 5, longitudinal reinforcement 6, transverse reinforcement 7, concrete 8 and inner longitudinal reinforcement 9 of reinforced concrete prefabricated slab.
参见图2，所述冷弯薄壁带肋U型钢梁1的横截面为矩形、具有中的内腔。所述冷弯薄壁带肋U型钢梁1的下端封闭、上端敞口。所述冷弯薄壁带肋U型钢梁1的上端敞口的两侧具有卷边。所述卷边即是钢梁的上翼缘，其上表面水平。所述卷边上具有若干排气孔3。设置这些排气孔，是为了保证浇筑混凝土时，能够填充满所述冷弯薄壁带肋U型钢梁1的内腔。Referring to FIG. 2 , the cross-section of the cold-formed thin-walled ribbed U-shaped steel beam 1 is rectangular and has a middle cavity. The cold-formed thin-wall ribbed U-shaped steel beam 1 has a closed lower end and an open upper end. Both sides of the upper open end of the cold-formed thin-walled ribbed U-shaped steel beam 1 have curling edges. The curling is the upper flange of the steel girder, the upper surface of which is horizontal. There are several air vents 3 on the curling. These vent holes are provided to ensure that the inner cavity of the cold-formed thin-walled ribbed U-shaped steel beam 1 can be filled when pouring concrete.
若干根相互平行的所述通长纵向受力钢筋2位于冷弯薄壁带肋U型钢梁1的内腔之中，与冷弯薄壁带肋U型钢梁1的底板连接在一起。A plurality of longitudinally stressed steel bars 2 parallel to each other are located in the inner cavity of the cold-formed thin-walled ribbed U-shaped steel beam 1 and are connected with the bottom plate of the cold-formed thin-walled ribbed U-shaped steel beam 1 .
如图2所述，所述折线形连接钢筋4被焊接在冷弯薄壁带肋U型钢梁1的上端的两侧卷边。实施例中，根据冷弯薄壁带肋U型外包钢-混凝土叠合板组合梁的跨度以及所受作用情况，确定合适的冷弯薄壁带肋U型钢梁1的截面尺寸、通长纵向受力钢筋2的直径及数量，以及折线形连接钢筋4的直径和弯折尺寸等。As shown in FIG. 2 , the zigzag connecting steel bar 4 is welded on both sides of the upper end of the cold-formed thin-walled ribbed U-shaped steel beam 1 and crimped. In the embodiment, according to the span of the cold-formed thin-walled ribbed U-shaped outsourcing steel-concrete composite slab composite beam and the condition of the action, the cross-sectional size and overall length of the suitable cold-formed thin-walled ribbed U-shaped steel beam 1 are determined The diameter and quantity of the longitudinally stressed steel bar 2, and the diameter and bending size of the broken-line connecting steel bar 4, etc.
所述钢筋混凝土预制底板5搁置在所述冷弯薄壁带肋U型钢梁1的上方。所述钢筋混凝土预制底板5是由相互平行的纵筋9、以及浇筑在这些纵筋9中的混凝土组成的。所述钢筋混凝土预制底板5的中间具有条形通孔，这个条形通孔位于所述冷弯薄壁带肋U型钢梁1的上端敞口的上方，两块混凝土预制底板中纵筋9的外伸段在这个条形通孔中搭接。The reinforced concrete prefabricated bottom plate 5 rests above the cold-formed thin-walled ribbed U-shaped steel beam 1 . The reinforced concrete prefabricated bottom slab 5 is composed of mutually parallel longitudinal bars 9 and concrete poured in these longitudinal bars 9 . There is a strip-shaped through hole in the middle of the reinforced concrete prefabricated floor 5, and this strip-shaped through hole is located above the upper opening of the cold-formed thin-walled ribbed U-shaped steel beam 1. The overhanging section of is lapped in this strip-shaped through hole.
所述钢筋混凝土预制底板5的面层铺设若干相互平行的纵向钢筋6，以及若干相互平行的横向钢筋7。在钢筋混凝土预制底板5的面层、预制底板端部的条形通孔和冷弯薄壁带肋U型钢梁1的空腔内整体浇筑混凝土8。The surface course of the reinforced concrete prefabricated floor 5 is laid with several parallel longitudinal reinforcement bars 6 and several mutual parallel transverse reinforcement bars 7 . Concrete 8 is integrally poured in the surface layer of the reinforced concrete prefabricated bottom slab 5 , the strip-shaped through hole at the end of the prefabricated bottom slab and the cavity of the cold-formed thin-walled ribbed U-shaped steel beam 1 .
本实施例的冷弯薄壁带肋U型钢梁1、通长纵向受力钢筋2、折线形连接钢筋4、钢筋混凝土预制底板5在工厂加工而成。首先在U型钢梁的上翼缘(卷边)上打出排气孔，然后再将将通长纵向受力钢筋2与冷弯薄壁带肋U型钢梁1下底板的内侧通过侧焊方式连接，最后将折线形连接钢筋4点焊在带肋U型钢梁1的上翼缘。In this embodiment, the cold-formed thin-walled ribbed U-shaped steel beam 1 , the full-length longitudinal stressed steel bar 2 , the broken-line connecting steel bar 4 , and the reinforced concrete prefabricated floor 5 are processed in a factory. Firstly, vent holes are drilled on the upper flange (curling) of the U-shaped steel beam, and then the inner side of the lower bottom plate of the cold-formed thin-walled ribbed U-shaped steel beam 1 is welded through the side. connection, and finally spot-weld the zigzag connecting steel bar 4 on the upper flange of the ribbed U-shaped steel beam 1.
工程现场施工步骤为：吊装安置就位组装好的冷弯薄壁带肋U型钢梁，铺设钢筋混凝土预制底板5，绑扎预制板面层上的纵向钢筋6、横向钢筋7，最后浇筑混凝土8。The construction steps of the project site are: hoisting and placing the assembled cold-formed thin-walled ribbed U-shaped steel beams in place, laying the reinforced concrete prefabricated floor 5, binding the longitudinal reinforcement 6 and the transverse reinforcement 7 on the surface of the prefabricated slab, and finally pouring concrete 8 .
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