CN108756061A - A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method - Google Patents
A kind of partial precast assembly prestress steel reinforced concrete hybrid beam and construction method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 17
- 238000010276 construction Methods 0.000 title claims description 30
- 239000004567 concrete Substances 0.000 claims abstract description 81
- 239000011372 high-strength concrete Substances 0.000 claims abstract description 78
- 238000005452 bending Methods 0.000 claims abstract description 4
- 210000003205 muscle Anatomy 0.000 claims abstract 11
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract 6
- 239000002131 composite material Substances 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 2
- 229920006327 polystyrene foam Polymers 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 210000002421 cell wall Anatomy 0.000 claims 1
- 229920006389 polyphenyl polymer Polymers 0.000 claims 1
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- 238000010089 rubber coagulation Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 230000002787 reinforcement Effects 0.000 description 9
- 210000002435 tendon Anatomy 0.000 description 9
- 238000009415 formwork Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; 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
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Abstract
Description
技术领域technical field
本发明属于建筑技术领域，特别涉及一种部分预制装配预应力型钢混凝土混合梁。The invention belongs to the technical field of buildings, in particular to a partially prefabricated and assembled prestressed steel-concrete composite beam.
背景技术Background technique
在现代钢筋混凝土结构中，早期应用的结构形式为现浇钢筋混凝土结构，它是在现场支模并整体浇筑而成的结构，具有取材容易、整体性能好、刚度大、可模性好等优点。但在设计、施工及使用过程中也有很多的缺点，如在设计过程中需考虑自重大的因素；现场进行支模与施工时有施工工序繁多，人工用量大，周期长，成本高等；使用过程中有抗裂性差等缺点，对创建资源节约型和环境友好型社会缺乏积极的推动作用。In the modern reinforced concrete structure, the structural form used in the early stage is the cast-in-place reinforced concrete structure. It is a structure formed by setting up formwork on site and pouring as a whole. It has the advantages of easy material selection, good overall performance, high rigidity, and good moldability. . However, there are also many shortcomings in the process of design, construction and use. For example, the self-heavy factor needs to be considered in the design process; there are many construction procedures when the formwork is set up and constructed on site, the amount of labor is large, the cycle is long, and the cost is high; the process of use There are shortcomings such as poor crack resistance, and it lacks a positive role in promoting the creation of a resource-saving and environment-friendly society.
随着建筑施工技术的发展，装配式混凝土结构出现，它是由预制构件为主要受力构件经装配或连接形成的混凝土结构。与现浇混凝土结构相比，装配式结构可以实现工业化生产，由于构件是在工厂进行浇筑与养护，构件的质量得以保证，建筑构件的制作不受季节的影响和限制，并且极大缩短了施工工期，生产效率高，节约了大量的支撑模板，有利于环境保护，但同时也存在着许多缺点，整体性能差，设计难度较大，抗渗性差，不利抗震，在运输安装方面也存在一定的问题。With the development of building construction technology, prefabricated concrete structures appear, which are concrete structures formed by assembling or connecting prefabricated components as the main force-bearing components. Compared with the cast-in-place concrete structure, the prefabricated structure can realize industrial production. Since the components are poured and maintained in the factory, the quality of the components can be guaranteed. The production of building components is not affected and restricted by the season, and the construction time is greatly shortened. The construction period is high, the production efficiency is high, and a large amount of supporting formwork is saved, which is beneficial to environmental protection, but at the same time there are many shortcomings, such as poor overall performance, difficult design, poor impermeability, unfavorable earthquake resistance, and certain problems in transportation and installation. question.
发明内容Contents of the invention
为了克服上述现有技术的缺点，本发明的目的在于提供一种部分预制装配预应力型钢混凝土混合梁，保留了现浇和装配式结构的优点，同时解决了两种结构的不足，具有现场施工简便、成本低廉、性能优良的特点。In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of prefabricated and assembled prestressed steel-concrete hybrid beam, which retains the advantages of cast-in-place and assembled structures, and simultaneously solves the deficiencies of the two structures, and has the advantages of on-site construction. Simple, low cost and excellent performance.
为了实现上述目的，本发明采用的技术方案是：In order to achieve the above object, the technical scheme adopted in the present invention is:
一种部分预制装配预应力型钢混凝土混合梁，其特征在于，包括：A partially prefabricated and assembled prestressed steel-concrete hybrid beam is characterized in that it includes:
预制U型高强混凝土槽1；Prefabricated U-shaped high-strength concrete tank 1;
填充于预制U型高强混凝土槽1中的现浇普通混凝土一2；Cast-in-place ordinary concrete-2 filled in the prefabricated U-shaped high-strength concrete tank 1;
设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的型钢5；The section steel 5 arranged in the prefabricated U-shaped high-strength concrete tank 1 and whose length direction is parallel to the length direction of the tank;
设置于预制U型高强混凝土槽1槽底且与槽长方向平行的若干纵筋一6；A number of longitudinal reinforcements-6 arranged at the bottom of the prefabricated U-shaped high-strength concrete tank 1 and parallel to the longitudinal direction of the tank;
设置于预制U型高强混凝土槽1中且与槽长方向垂直的若干闭合的箍筋7；A number of closed stirrups 7 arranged in the prefabricated U-shaped high-strength concrete groove 1 and perpendicular to the length direction of the groove;
设置于预制U型高强混凝土槽1槽顶且与槽长方向平行的若干纵筋二8；A number of longitudinal reinforcements 2 8 arranged on the top of the prefabricated U-shaped high-strength concrete tank 1 and parallel to the longitudinal direction of the tank;
设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的轻质芯膜9，轻质芯膜9紧贴设置于型钢5的腹板侧边；The lightweight core membrane 9 arranged in the prefabricated U-shaped high-strength concrete tank 1 and whose length direction is parallel to the groove length direction, the lightweight core membrane 9 is arranged closely on the side of the web of the section steel 5;
设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的预应力筋10；Prestressed tendons 10 arranged in the prefabricated U-shaped high-strength concrete groove 1 and whose length direction is parallel to the groove length direction;
以及，as well as,
设置于预制U型高强混凝土槽1顶部的现浇翼缘板。The cast-in-place flange plate arranged on the top of the prefabricated U-shaped high-strength concrete tank 1.
所述工字钢5的下部位于预制U型高强混凝土槽1的槽底中，预应力筋10根据施工要求进行张拉，所述闭合箍筋7的下部位于预制U型高强混凝土槽1的槽壁与槽底中，纵筋一6位于预制U型高强混凝土槽1的槽底部并焊接在箍筋7闭合圈内的底部，纵筋二8位于预制U型高强混凝土槽1的上方并焊接在箍筋7闭合圈内的顶部，所述预制U型高强混凝土槽1、型钢5、纵筋一6、箍筋7、纵筋二8、轻质芯膜9以及预应力筋10均为预制部分。The lower part of the I-beam 5 is located in the bottom of the prefabricated U-shaped high-strength concrete groove 1, the prestressed tendon 10 is stretched according to the construction requirements, and the lower part of the closed stirrup 7 is located in the groove of the prefabricated U-shaped high-strength concrete groove 1 Among the wall and the bottom of the tank, the first longitudinal bar 6 is located at the bottom of the prefabricated U-shaped high-strength concrete tank 1 and is welded to the bottom of the closed circle of the stirrup 7, and the second longitudinal bar 8 is located above the prefabricated U-shaped high-strength concrete tank 1 and welded to the The top in the closed circle of the stirrup 7, the prefabricated U-shaped high-strength concrete groove 1, the section steel 5, the first longitudinal bar 6, the stirrup 7, the second longitudinal bar 8, the lightweight core membrane 9 and the prestressed tendon 10 are all prefabricated parts .
所述型钢5在长度方向上，两端伸出预制U型高强混凝土槽1，所述型钢5为H型钢、工字钢或蜂窝钢。Both ends of the section steel 5 protrude from the prefabricated U-shaped high-strength concrete groove 1 in the length direction, and the section steel 5 is H-section steel, I-shaped steel or honeycomb steel.
所述轻质芯膜9为聚苯乙烯泡沫芯膜、聚苯内膜、充气橡胶芯膜或其他轻质防火隔热材料。The lightweight core film 9 is polystyrene foam core film, polystyrene inner film, air-filled rubber core film or other lightweight fire-proof and heat-insulating materials.
所述现浇普通混凝土一2和现浇翼缘板均为现浇部分。The cast-in-place ordinary concrete-2 and the cast-in-place flange plate are all cast-in-place parts.
所述现浇普通混凝土一2和现浇翼缘板所采用的混凝土强度低于预制高强混凝土矩形截面1所采用的混凝土强度。The strength of the concrete used in the cast-in-place ordinary concrete-2 and the cast-in-place flange plate is lower than the concrete strength used in the prefabricated high-strength concrete rectangular section 1.
所述现浇普通混凝土一2和现浇翼缘板所采用的混凝土为再生混凝土、轻骨料混凝土、橡胶混凝土、吸声混凝土或保温隔热混凝土。The concrete used in the cast-in-place ordinary concrete-2 and the cast-in-place flange plate is recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete or thermal insulation concrete.
所述现浇翼缘板采用压型钢板-混凝土组合板或叠合楼板。The cast-in-place flange board adopts profiled steel plate-concrete composite board or laminated floor board.
所述压型钢板-混凝土组合板由压型钢板或预制混凝土板3和现浇普通混凝土二4组成，其中压型钢板或预制混凝土板3与预制U型高强混凝土槽1的顶部连接。The profiled steel plate-concrete composite plate is composed of profiled steel plate or prefabricated concrete slab 3 and cast-in-place ordinary concrete 2 4, wherein the profiled steel plate or precast concrete slab 3 is connected to the top of the prefabricated U-shaped high-strength concrete tank 1 .
本发明还提供了所述部分预制装配预应力型钢混凝土混合梁的施工方法，步骤如下：The present invention also provides a construction method for the partially prefabricated and assembled prestressed steel-concrete composite beam, the steps of which are as follows:
1)在工厂，将纵筋一6焊接在箍筋7圈内的底部，纵筋二8焊接在箍筋7圈内的顶部，将轻质芯模9紧贴型钢5腹板侧边并在特定位置(纯弯段)固定，预应力筋10根据施工要求进行张拉，将箍筋7的下部、纵筋一6、及型钢5与预应力筋10的下部浇筑于预制U型高强混凝土槽1中，完成预制部分；1) In the factory, the first longitudinal bar 6 is welded to the bottom of the 7 circles of the stirrups, the second longitudinal bar 8 is welded to the top of the 7 circles of the stirrups, the lightweight mandrel 9 is attached to the side of the web of the section steel 5 and placed on the The specific position (pure bending section) is fixed, the prestressed tendon 10 is stretched according to the construction requirements, and the lower part of the stirrup 7, the longitudinal bar 6, the section steel 5 and the lower part of the prestressed tendon 10 are poured in the prefabricated U-shaped high-strength concrete groove 1, complete the prefabrication part;
2)在现场，将型钢5的两端与组合柱或钢柱直接连接，或与混凝土柱过渡连接；2) On site, directly connect the two ends of the section steel 5 with the composite column or steel column, or transitionally connect with the concrete column;
3)向预制U型高强混凝土槽1中浇筑现浇普通混凝土一2；3) Pour in-situ ordinary concrete-2 into the prefabricated U-shaped high-strength concrete tank 1;
4)向预制U型高强混凝土槽1上方浇筑现浇翼缘板。4) Pour the cast-in-situ flange plate above the prefabricated U-shaped high-strength concrete tank 1 .
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1)施工方便。1) Easy construction.
该预制装配预应力型钢混凝土混合梁的钢骨架部分包括梁下部纵筋、箍筋、预应力筋、型钢和下部混凝土，该部分均在工厂预制生产完成，在工地将预制部分的型钢与组合柱或钢柱直接连接(或与混凝土柱过渡连接)，再浇筑混凝土楼板即完成安装。与传统SRC梁相比，现场不用绑扎钢筋、支模、拆模和架设梁下临时支撑。若楼板采用压型钢板-混凝土组合板或叠合楼板，则整个施工过程中均无需支模、拆模和设临时支撑，现场施工工序、施工材料和施工工时均将减小，施工效率将得以提高。The steel skeleton part of the prefabricated prestressed steel-concrete hybrid beam includes the lower longitudinal reinforcement of the beam, hoops, prestressed tendons, section steel and lower concrete. Or the steel column is directly connected (or transitionally connected with the concrete column), and then the concrete floor is poured to complete the installation. Compared with traditional SRC beams, there is no need to bind steel bars, set up formwork, remove formwork and erect temporary supports under the beams on site. If the floor slab adopts profiled steel-concrete composite slab or laminated floor slab, there is no need for formwork support, formwork removal and temporary support during the entire construction process, and the on-site construction procedures, construction materials and construction hours will all be reduced, and the construction efficiency will be improved. improve.
2)自重减轻。2) Weight reduction.
该预制U型高强混凝土槽中的型钢中部中间段加入一定轻质芯模，或采用蜂窝型钢，在梁与楼板浇筑完成后，与不加轻质芯模相比，从而使梁的整体自重减轻。且梁在受均布荷载作用时，抵抗弯矩基本不受影响的前提下，中部加入一定轻质芯模，很符合剪力跨中小两头大的受力特点。A certain light-weight mandrel is added to the middle section of the steel in the prefabricated U-shaped high-strength concrete groove, or a honeycomb steel is used. After the beam and the floor are poured, compared with no light-weight mandrel, the overall weight of the beam is reduced. . In addition, when the beam is subjected to uniformly distributed loads, under the premise that the resistance to bending moment is basically not affected, a certain lightweight mandrel is added in the middle, which is very consistent with the force characteristics of the small, medium and large ends of the shear span.
3)成本减少。3) Cost reduction.
在传统SRC梁施工中，梁与楼板一起浇筑，即梁中混凝土和楼板中混凝土必须为同一品种和同一强度等级混凝土。跨度较大的型钢混凝土梁多采用高强混凝土。楼板也同样采用高强混凝土，从而使楼板钢筋用量增加，致使成本增加。而该预制装配预应力型钢混凝土混合梁仅在梁预制部分采用高强混凝土，而梁和楼板现浇部分采用普通混凝土、再生混凝土或轻骨料混凝土，从而楼板钢筋用量减少，致使成本减少。In traditional SRC beam construction, the beam and the floor are poured together, that is, the concrete in the beam and the concrete in the floor must be of the same type and strength grade. Steel concrete beams with large spans are mostly made of high-strength concrete. The floor slab also uses high-strength concrete, which increases the amount of steel reinforcement in the floor slab and increases the cost. However, the prefabricated and prestressed steel-concrete mixed beam only uses high-strength concrete in the prefabricated part of the beam, while the cast-in-place part of the beam and floor slab uses ordinary concrete, recycled concrete or lightweight aggregate concrete, thereby reducing the amount of steel reinforcement in the floor slab, resulting in a reduction in cost.
3)功能提升。3) Function improvement.
该预制装配预应力型钢混凝土混合梁梁中混凝土和楼板中混凝土采用不同强度等级的混凝土，满足多功能要求。为减轻楼盖自重，采用轻骨料混凝土；为提高楼盖减振隔音效果，采用橡胶混凝土或吸声混凝土；为提高楼盖保温性能，采用保温隔热混凝土。The concrete in the prefabricated and assembled prestressed steel-concrete mixed beam and the concrete in the floor slab adopt different strength grades to meet multi-functional requirements. In order to reduce the weight of the floor, lightweight aggregate concrete is used; in order to improve the vibration and sound insulation effect of the floor, rubber concrete or sound-absorbing concrete is used; in order to improve the thermal insulation performance of the floor, thermal insulation concrete is used.
4)施工质量好。4) The construction quality is good.
在传统SRC梁施工中，施工工序多、施工难度大，常出现SRC梁腹板中混凝土振捣差、混凝土强度不足和梁中钢筋错位等问题，施工质量不易控制。而在该预制装配预应力型钢混凝土混合梁中，腹板部分大都为工厂预制，混凝土浇筑振捣方便且可采用蒸汽养护，混凝土施工质量易于控制。In the construction of traditional SRC beams, there are many construction procedures and difficult construction. Problems such as poor concrete vibration in the SRC beam web, insufficient concrete strength, and dislocation of steel bars in the beam often occur, and the construction quality is not easy to control. In the prefabricated prestressed steel-concrete hybrid beam, most of the web part is prefabricated in the factory, the concrete pouring and vibration are convenient and can be cured by steam, and the concrete construction quality is easy to control.
总体来讲，与传统SRC梁相比，该预制装配预应力型钢混凝土混合梁简化了施工工序和施工难度，有效解决了一些长期制约传统SRC梁推广应用的关键难题，并且能充分发挥梁在受力性能、耐久性能、耐火性能和经济性能等方面的优势，可以广泛应用于各类钢筋混凝土和钢结构建筑中，尤其适用于大跨度、重荷载或复杂、不规则的高层建筑和超高层建筑。因此，对预制装配预应力型钢混凝土混合梁开展深入研究极具工程实际意义。Generally speaking, compared with the traditional SRC beam, the prefabricated prestressed steel concrete hybrid beam simplifies the construction process and construction difficulty, effectively solves some key problems that have long restricted the popularization and application of the traditional SRC beam, and can give full play to the beam's ability to withstand It can be widely used in various reinforced concrete and steel structure buildings, especially for long-span, heavy-load or complex and irregular high-rise buildings and super high-rise buildings. . Therefore, it is of great engineering practical significance to carry out in-depth research on prefabricated prestressed steel-concrete hybrid beams.
附图说明Description of drawings
图1是本发明钢骨架部分的立体示意图。Fig. 1 is a three-dimensional schematic view of the steel skeleton part of the present invention.
图2是本发明预制部分的立体示意图。Fig. 2 is a schematic perspective view of the prefabricated part of the present invention.
图3是本发明现浇部分的立体示意图。Fig. 3 is a schematic perspective view of the cast-in-place part of the present invention.
图4是本发明采用工字型钢预制部分的截面示意图。Fig. 4 is a schematic cross-sectional view of the prefabricated part using I-shaped steel in the present invention.
图5是图4中A-A向视图，即预制U型高强混凝土槽中轻质芯模的截面图。Fig. 5 is a view from the direction of A-A in Fig. 4, that is, a cross-sectional view of the lightweight mandrel in the prefabricated U-shaped high-strength concrete tank.
图6是图4中B-B向视图，即预制U型高强混凝土槽截面图。Fig. 6 is a view from the direction B-B in Fig. 4, that is, a cross-sectional view of a prefabricated U-shaped high-strength concrete tank.
图7是本发明采用工字型钢现浇部分的截面示意图。Fig. 7 is a schematic cross-sectional view of the cast-in-place part using I-shaped steel in the present invention.
图8是图7中C-C向视图，即预制U型高强混凝土槽中轻质芯模的截面图。Fig. 8 is a view from direction C-C in Fig. 7, that is, a cross-sectional view of a lightweight mandrel in a prefabricated U-shaped high-strength concrete tank.
图9是图7中D-D向视图，即预制U型高强混凝土槽截面图。Fig. 9 is a view from the direction D-D in Fig. 7, that is, a cross-sectional view of a prefabricated U-shaped high-strength concrete tank.
图10是本发明采用蜂窝型钢预制部分的截面示意图。Fig. 10 is a schematic cross-sectional view of the prefabricated part using honeycomb steel in the present invention.
图11是图10中E-E向视图，即预制U型高强混凝土槽中轻质芯模的截面图。Fig. 11 is a view from E-E direction in Fig. 10, that is, a cross-sectional view of a lightweight mandrel in a prefabricated U-shaped high-strength concrete tank.
图12是图10中F-F向视图，即预制U型高强混凝土槽截面图。Fig. 12 is a view from the direction of F-F in Fig. 10, that is, a cross-sectional view of a prefabricated U-shaped high-strength concrete tank.
图13是本发明采用蜂窝型钢现浇部分的截面示意图。Fig. 13 is a schematic cross-sectional view of the cast-in-place part of honeycomb steel in the present invention.
图14是图13中G-G向视图，即预制U型高强混凝土槽中轻质芯模的截面图。Fig. 14 is a G-G view in Fig. 13, that is, a cross-sectional view of a lightweight mandrel in a prefabricated U-shaped high-strength concrete tank.
图15是图13中H-H向视图，即预制U型高强混凝土槽截面图。Fig. 15 is a view from the direction of H-H in Fig. 13, that is, a cross-sectional view of a prefabricated U-shaped high-strength concrete tank.
具体实施方式Detailed ways
下面结合附图和实施例详细说明本发明的实施方式。The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
本发明一种部分预制装配预应力型钢混凝土混合梁，采用部分预制装配部分现浇的思想，由预制部分和现浇部分组成，如图1至图15所示，包括：The present invention is a partially prefabricated and assembled prestressed steel-concrete mixed beam, which adopts the idea of partially prefabricated and assembled and partially cast-in-place, and consists of a prefabricated part and a cast-in-place part, as shown in Figures 1 to 15, including:
预制U型高强混凝土槽1；设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的型钢5；设置于预制U型高强混凝土槽1槽底且与槽长方向平行的若干纵筋一6；设置于预制U型高强混凝土槽1中且与槽长方向垂直的若干闭合的箍筋7；设置于预制U型高强混凝土槽1上方且与槽长方向平行的若干纵筋二8；设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的轻质芯模9；设置于预制U型高强混凝土槽1中且长度方向与槽长方向平行的预应力筋10；填充于预制U型高强混凝土槽1中的现浇普通混凝土一2；以及设置于预制U型高强混凝土槽1顶部的现浇翼缘板。Prefabricated U-shaped high-strength concrete trough 1; section steel 5 arranged in the prefabricated U-shaped high-strength concrete trough 1 and whose length direction is parallel to the long direction of the trough; Rib 1 6; a number of closed stirrups 7 arranged in the prefabricated U-shaped high-strength concrete groove 1 and perpendicular to the groove length direction; a number of longitudinal reinforcement 2 8 arranged above the prefabricated U-shaped high-strength concrete groove 1 and parallel to the groove length direction ; a lightweight mandrel 9 arranged in the prefabricated U-shaped high-strength concrete groove 1 and whose length direction is parallel to the groove length direction; a prestressed tendon 10 arranged in the prefabricated U-shaped high-strength concrete groove 1 and whose length direction is parallel to the groove length direction; cast-in-place ordinary concrete-2 filled in the prefabricated U-shaped high-strength concrete tank 1;
其中，如图2所示，型钢5的下部埋于预制U型高强混凝土槽1的槽底中，纵筋一6焊接在箍筋5圈内的底部，箍筋7的下部埋在预制U型高强混凝土槽1的槽壁以及槽底中且上部悬空，纵筋二8焊接在箍筋7悬空部分的圈内顶部且与纵筋一6平行，预应力筋10根据施工要求进行张拉，预制U型高强混凝土槽1、型钢5、纵筋一6、箍筋7、纵筋二8、轻质芯模9以及预应力筋10均为预制部分。Among them, as shown in Figure 2, the lower part of the section steel 5 is buried in the bottom of the prefabricated U-shaped high-strength concrete tank 1, the longitudinal bar 6 is welded to the bottom of the 5 circles of the stirrup, and the lower part of the stirrup 7 is buried in the prefabricated U-shaped The wall of the high-strength concrete tank 1 and the middle and upper part of the tank bottom are suspended in the air. The second longitudinal bar 8 is welded to the inner top of the circle of the suspended part of the stirrup 7 and is parallel to the first longitudinal bar 6. The prestressed bar 10 is stretched according to the construction requirements, prefabricated U-shaped high-strength concrete groove 1, section steel 5, longitudinal reinforcement 1 6, stirrup 7, longitudinal reinforcement 2 8, lightweight mandrel 9 and prestressed reinforcement 10 are all prefabricated parts.
如图3所示，现浇普通混凝土一2和现浇翼缘板组成现浇部分。现浇翼缘板可以采用压型钢板-混凝土组合板或叠合楼板。本实施例中用压型钢板-混凝土组合板由压型钢板或预制混凝土板3和现浇普通混凝土二4组成，其中压型钢板或预制混凝土板3与预制U型高强混凝土槽1的顶部连接。现浇后，型钢5的上部、箍筋7的上部以及纵筋二8均处于现浇部分中。As shown in Figure 3, the cast-in-place ordinary concrete-2 and the cast-in-place flange plate form the cast-in-place part. The cast-in-place flange slab can use profiled steel plate-concrete composite slab or laminated floor slab. In this embodiment, the profiled steel plate-concrete composite plate is composed of profiled steel plate or prefabricated concrete slab 3 and cast-in-place ordinary concrete 2 4, wherein the profiled steel plate or prefabricated concrete slab 3 is connected to the top of the prefabricated U-shaped high-strength concrete tank 1 . After cast-in-place, the upper part of the section steel 5, the upper part of the stirrup 7 and the second longitudinal bar 8 are all in the cast-in-place part.
其中：in:
1)预制部分所涉及的混凝土采用高强混凝土，可提高预制装配钢筋混凝土梁的抗裂性能、耐久性能和耐火性能。1) The concrete involved in the prefabricated part adopts high-strength concrete, which can improve the crack resistance, durability and fire resistance of prefabricated reinforced concrete beams.
2)型钢5在长度方向上，两端伸出预制U型高强混凝土槽1，即在预制型钢骨架部分外伸小段型钢，在施工安装时与预埋柱外伸型钢螺栓进行连接，从而便于预制高强混凝土钢筋骨架。2) In the length direction, both ends of the section steel 5 protrude from the prefabricated U-shaped high-strength concrete groove 1, that is, a small section of section steel protrudes from the prefabricated section steel skeleton, and is connected with the prefabricated column extension section steel bolts during construction and installation, so as to facilitate prefabrication High-strength concrete reinforced skeleton.
3)本发明轻质芯模所涉及的长度、高度、材料等设计参数可以根据相应的设计计算方法和具体施工案例进行优化设计。3) Design parameters such as length, height, and material involved in the lightweight mandrel of the present invention can be optimally designed according to corresponding design calculation methods and specific construction cases.
4)型钢5可以采用H型钢或工字钢，而对于有使用要求梁内预埋横向管道，可以将H型钢或工字钢换成蜂窝钢，调整蜂窝钢空洞大小以满足实际使用需求。4) Section steel 5 can be H-section steel or I-steel, and for the pre-embedded horizontal pipes in beams with usage requirements, H-section steel or I-steel can be replaced by honeycomb steel, and the size of the honeycomb steel cavity can be adjusted to meet actual use requirements.
具体施工方法为：The specific construction method is:
首先在工厂预制梁的下部腹板部分，然后在工地现场安装梁的下部腹板部分，最后与混凝土楼板一起整浇梁的上部翼缘板部分。梁预制部分中的全部型钢上翼缘、上部纵筋和箍筋外露。梁的下部预制腹板部分为带预应力筋和带轻质芯膜的预制U型高强混凝土槽(即腹板)的高强混凝土钢筋骨架；梁的上部现浇翼缘板部分可以为钢筋混凝土板、压型钢板-混凝土组合板和预制混凝土叠合板等形式，其中现浇混凝土可以为普通混凝土、再生混凝土、轻骨料混凝土等不同类型混凝土。通过不同形式的预制腹板部分和不同形式的现浇翼缘板的相互组合，可以优化组合成各种类型的梁，并各具性能特点和优点，适合于不同工程情况需求。The lower web part of the beam is first prefabricated in the factory, then the lower web part of the beam is installed on site, and finally the upper flange part of the beam is cast together with the concrete floor slab. All steel upper flanges, upper longitudinal reinforcement and stirrups in the prefabricated part of the beam are exposed. The lower prefabricated web part of the beam is a high-strength concrete steel skeleton with prefabricated tendons and prefabricated U-shaped high-strength concrete grooves (ie webs) with a lightweight core membrane; the upper part of the beam's cast-in-place flange part can be a reinforced concrete slab , profiled steel plate-concrete composite slab and prefabricated concrete composite slab and other forms, among which the cast-in-place concrete can be different types of concrete such as ordinary concrete, recycled concrete, and lightweight aggregate concrete. Through the mutual combination of different forms of prefabricated web parts and different forms of cast-in-place flange plates, various types of beams can be optimally combined, each with its own performance characteristics and advantages, suitable for different engineering conditions.
本发明在传统矩型预制梁基础上，预制部分采用工字钢、高强混凝土和预应力筋一起浇筑，有效提高预制部分整体性，满足现场吊装要求，是一种良好的预制方法。根据本发明提出设计方法，可以进一步优化蜂窝形状，工字钢种类，预制混凝土内表面纹路，预制部分混凝土强度等各个参数，现浇混凝土强度和种类(再生混凝土、轻骨料混凝土等)以实现本实例优化设计。On the basis of traditional rectangular prefabricated beams, the prefabricated part is poured together with I-beam, high-strength concrete and prestressed tendons, which effectively improves the integrity of the prefabricated part and meets the requirements for on-site hoisting. It is a good prefabricated method. According to the design method proposed by the present invention, various parameters such as the shape of the honeycomb, the type of I-beam, the texture of the inner surface of the precast concrete, the strength of the prefabricated part of the concrete, and the strength and type of the cast-in-place concrete (recycled concrete, lightweight aggregate concrete, etc.) can be further optimized to achieve This example optimizes the design.
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