CN103061243B - Prestressed steel tube concrete combination trussed beam and construction method thereof - Google Patents
Prestressed steel tube concrete combination trussed beam and construction method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 238
- 239000010959 steel Substances 0.000 title claims abstract description 238
- 238000010276 construction Methods 0.000 title claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 32
- 210000002435 tendon Anatomy 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims description 9
- 238000009415 formwork Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 1
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- 230000009916 joint effect Effects 0.000 description 1
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Abstract
本发明涉及一种预应力钢管混凝土组合桁梁，包括钢管桁梁和混凝土桥面板，所述钢管桁梁顶部与混凝土桥面板底部相连接，所述钢管桁梁由两根平行的上弦钢管、一根下弦钢管以及复数根对称连接上弦钢管和下弦钢管的钢腹杆组成，所述下弦钢管内填充有混凝土，所述下弦钢管内铺设有施加预应力的预应力筋。本发明还涉及一种预应力钢管混凝土组合桁梁的施工方法。本发明通过对钢管混凝土下弦钢管施加预应力，可在减轻结构自重的前提下提高钢管混凝土组合桁梁的整体刚度，减小钢管混凝土组合桁梁在结构自重和车辆荷载下的变形，同时也可避免钢腹杆与下弦钢管焊接处因变形过大而开裂，下弦钢管施加预应力后可使钢管混凝土组合桁梁应用于更大跨度的桥梁结构中。
The invention relates to a prestressed steel pipe concrete composite truss, comprising a steel pipe truss and a concrete deck, the top of the steel pipe truss is connected to the bottom of the concrete bridge deck, and the steel pipe truss is composed of two parallel upper chord steel pipes, a It consists of a lower string steel pipe and a plurality of steel web bars symmetrically connecting the upper string steel pipe and the lower string steel pipe. The lower string steel pipe is filled with concrete, and the lower string steel pipe is laid with prestressed tendons for applying prestress. The invention also relates to a construction method of the prestressed steel pipe concrete composite truss girder. The present invention can increase the overall rigidity of the steel pipe concrete composite truss beam under the premise of reducing the self-weight of the structure by applying prestress to the steel pipe concrete bottom chord steel pipe, and reduce the deformation of the steel pipe concrete composite truss beam under the structure self weight and vehicle load. To avoid cracking due to excessive deformation of the weld between the steel web and the lower chord steel pipe, the prestressed lower chord steel pipe can make the steel tube concrete composite truss girder be applied to a bridge structure with a larger span.
Description
技术领域 technical field
本发明涉及一种预应力钢管混凝土组合桁梁及其施工方法，属于土木建筑技术领域。 The invention relates to a prestressed steel pipe concrete composite truss beam and a construction method thereof, belonging to the technical field of civil engineering.
背景技术 Background technique
钢－混凝土组合梁桥通过连接件保证钢梁和混凝土板的整体共同受力，可充分发挥钢与混凝土材料的优势，近年来得到了迅猛发展。由钢管桁梁和混凝土板组合形成的钢管组合桁梁是一种比较合理的组合梁桥结构，其充分利用了圆钢管构件回转半径大、抗扭性能好、加工方便和防腐性能高等优点，同时又可在不增加成本的前提下通过调整钢管桁梁的高度获取所需的结构抗弯刚度。钢管组合桁梁目前已广泛应用于连续梁桥、连续刚构桥、斜拉桥和悬索桥等桥型中。 Steel-concrete composite girder bridges ensure the joint stress of the steel girder and the concrete slab through connectors, which can give full play to the advantages of steel and concrete materials, and have developed rapidly in recent years. The steel pipe composite truss formed by the combination of steel pipe truss and concrete slab is a relatively reasonable composite beam bridge structure. In addition, the required structural bending stiffness can be obtained by adjusting the height of the steel pipe truss without increasing the cost. Steel pipe composite trusses have been widely used in bridge types such as continuous girder bridges, continuous rigid frame bridges, cable-stayed bridges and suspension bridges.
钢管组合桁梁有一个比较突出的问题：主、支管相交的节点区是其薄弱环节，结构承载力往往由局部节点破坏控制，致使钢管组合桁梁的预期整体性能无法充分发挥。为此，可通过在下弦钢管内填充混凝土来提高节点区局部刚度和强度，保证节点区的局部破坏不早于整体破坏发生，并由此形成了另一种组合梁桥结构——钢管混凝土组合桁梁。然而，虽然钢管混凝土组合桁梁可进一步提高结构的整体刚度和承载力，但是当桁梁跨度较大时，在结构自重及车辆荷载的共同作用下，桁梁将产生较大的变形，无法满足正常使用极限状态的要求。 The steel pipe composite truss girder has a relatively prominent problem: the node area where the main and branch pipes intersect is its weak link, and the structural bearing capacity is often controlled by local node failure, resulting in the expected overall performance of the steel pipe composite truss girder cannot be fully utilized. For this reason, the local stiffness and strength of the joint area can be improved by filling concrete in the lower chord steel pipe, so as to ensure that the local failure of the joint area does not occur earlier than the overall failure, and thus another composite beam bridge structure - steel pipe concrete composite trusses. However, although CFST composite trusses can further improve the overall stiffness and bearing capacity of the structure, when the span of the trusses is large, the trusses will undergo large deformation under the joint action of the structure's own weight and vehicle loads, which cannot meet the Requirements for normal service limit state.
发明内容 Contents of the invention
本发明针对上述现有钢管混凝土组合桁梁在大跨桥梁中应用的缺陷作出改进，即本发明要解决的技术问题是提供一种变形小的预应力钢管混凝土组合桁梁及其施工方法。 The present invention makes improvements to the above-mentioned defects in the application of the existing concrete-filled steel tube composite truss beams in long-span bridges, that is, the technical problem to be solved by the present invention is to provide a prestressed steel tube concrete composite truss beam with small deformation and its construction method.
为了解决上述技术问题，本发明的技术方案是：一种预应力钢管混凝土组合桁梁，包括钢管桁梁和混凝土桥面板，所述钢管桁梁顶部与混凝土桥面板底部相连接，所述钢管桁梁由两根平行的上弦钢管、一根下弦钢管以及复数根对称连接上弦钢管和下弦钢管的钢腹杆组成，所述下弦钢管内填充有混凝土，所述下弦钢管内铺设有施加预应力的预应力筋。 In order to solve the above technical problems, the technical solution of the present invention is: a prestressed steel pipe concrete composite truss, comprising a steel pipe truss and a concrete deck, the top of the steel pipe truss is connected to the bottom of the concrete bridge deck, and the steel pipe truss The beam is composed of two parallel upper chord steel pipes, one lower chord steel pipe and a plurality of steel web bars symmetrically connecting the upper chord steel pipe and the lower chord steel pipe. The lower chord steel pipes are filled with concrete, and the lower chord steel pipes are laid with prestressed Stress tendon.
进一步的，所述下弦钢管直径D为钢腹杆的2~3倍，所述预应力筋采用后张法张拉，所述预应力筋中轴线位于下弦钢管中轴线下方并且间距为e，e取值于D/6~D/3之间。 Further, the diameter D of the lower chord steel pipe is 2 to 3 times that of the steel web, the prestressed tendons are stretched by post-tensioning, the central axis of the prestressed tendons is located below the central axis of the lower chord steel pipe and the distance is e, e The value is between D/6~D/3.
进一步的，所述混凝土桥面板包覆上弦钢管，所述上弦钢管内填充有混凝土。 Further, the concrete bridge deck covers the upper chord steel pipe, and the upper chord steel pipe is filled with concrete.
进一步的，所述钢腹杆为空钢管或内部填充有混凝土的钢管。 Further, the steel web rod is an empty steel pipe or a steel pipe filled with concrete inside.
进一步的，所述钢腹杆顶部设置有方便其与上弦钢管相连接的连接板。 Further, the top of the steel web is provided with a connecting plate to facilitate its connection with the upper chord steel pipe.
进一步的，所述下弦钢管由两根平行且相互连接的细钢管替代，所述钢腹杆连接位于同一侧的上弦钢管和细钢管。 Further, the lower chord steel pipe is replaced by two parallel and interconnected thin steel pipes, and the steel web bar connects the upper chord steel pipe and the thin steel pipe on the same side.
同时，本发明还提供一种预应力钢管混凝土组合桁梁的施工方法，按以下步骤进行：（1）采用分段焊接制作下弦钢管，先按照设计好的位置在下弦钢管内放置和固定预应力筋，然后在下弦钢管内填充混凝土，当混凝土强度达到75%时，再张拉预应力筋以对下弦钢管施加预应力；（2）调整好下弦钢管位置，清理下弦钢管焊接部位，将钢腹杆焊接于下弦钢管上；（3）将上弦钢管焊接于钢腹杆上，上弦钢管与钢腹杆、下弦钢管形成作为骨架的钢管桁梁；（4）在钢管桁梁顶部搭设桥面板模板，浇筑混凝土形成混凝土桥面板。 At the same time, the present invention also provides a construction method for prestressed steel pipe concrete composite truss girder, which is carried out according to the following steps: (1) The lower chord steel pipe is manufactured by segmental welding, and the prestressed steel pipe is first placed and fixed in the lower chord steel pipe according to the designed position Then fill the concrete in the lower chord steel pipe. When the concrete strength reaches 75%, stretch the prestressed tendon to apply prestress to the lower chord steel pipe; (2) Adjust the position of the lower chord steel pipe, clean the welding part of the lower chord The rods are welded to the lower chord steel pipes; (3) The upper chord steel pipes are welded to the steel web rods, and the upper chord steel pipes, the steel web rods and the lower chord steel pipes form a steel pipe truss girder as a skeleton; (4) The bridge deck formwork is erected on the top of the steel pipe truss girders The concrete is poured to form the concrete bridge deck.
进一步的，在步骤（1）中，所述预应力筋中轴线位于下弦钢管中轴线下方并且间距为e，e取值于D/6~D/3之间，其中D为下弦钢管直径。 Further, in step (1), the central axis of the prestressed tendon is located below the central axis of the lower chord steel pipe with an interval of e, where e is between D/6 and D/3, where D is the diameter of the lower chord steel pipe.
进一步的，在步骤（2）中，所述下弦钢管直径D为钢腹杆的2~3倍，所述钢腹杆为空钢管，当剪力较大时在空钢管内填充混凝土。 Further, in step (2), the diameter D of the lower chord steel pipe is 2 to 3 times that of the steel web, and the steel web is an empty steel pipe, and concrete is filled in the empty steel pipe when the shear force is large.
进一步的，在步骤（2）中，所述下弦钢管由两根平行且相互连接的细钢管替代，将相应的钢腹杆焊接在与上弦钢管同侧的细钢管上。 Further, in step (2), the lower chord steel pipe is replaced by two parallel and interconnected thin steel pipes, and the corresponding steel web bars are welded to the thin steel pipe on the same side as the upper chord steel pipe.
进一步的，在步骤（3）中，当钢腹杆管径大于上弦钢管管径时，所述钢腹杆顶部设置有方便其与上弦钢管相连接的连接板。 Further, in step (3), when the diameter of the steel web is larger than the diameter of the upper chord steel pipe, the top of the steel web is provided with a connecting plate to facilitate its connection with the upper chord steel pipe.
进一步的，在步骤（4）中，所述混凝土桥面板包覆上弦钢管，所述上弦钢管内填充有混凝土。 Further, in step (4), the concrete bridge deck covers the upper chord steel pipe, and the upper chord steel pipe is filled with concrete.
与现有技术相比，本发明具有以下有益效果：通过对钢管混凝土下弦钢管施加预应力，可在减轻结构自重的前提下提高钢管混凝土组合桁梁的整体刚度，减小钢管混凝土组合桁梁在结构自重和车辆荷载下的变形，同时也可避免钢腹杆与下弦钢管焊接处因变形过大而开裂，下弦钢管施加预应力后可使钢管混凝土组合桁梁应用于更大跨度的桥梁结构中。 Compared with the prior art, the present invention has the following beneficial effects: by applying prestress to the steel tube concrete bottom chord steel tube, the overall stiffness of the steel tube concrete composite truss beam can be increased under the premise of reducing the structure's own weight, and the steel tube concrete composite truss beam can be reduced. The deformation of the structure under the weight of the vehicle and the load of the vehicle can also avoid cracking due to excessive deformation at the weld between the steel web member and the lower chord steel pipe. After prestressing the lower chord steel pipe, the steel tube concrete composite truss beam can be used in bridge structures with larger spans .
下面结合附图和具体实施方式对本发明作进一步详细的说明。 The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
附图说明 Description of drawings
图1为本发明实施例的横桥向断面图。 Fig. 1 is a cross-sectional view of an embodiment of the present invention in the direction of a bridge.
图2是图1 中A-A处的一种剖视图。 Fig. 2 is a kind of sectional view at A-A place among Fig. 1.
图3是图1 中A-A处的另一种剖视图。 Fig. 3 is another kind of sectional view of A-A place among Fig. 1.
图中：1-下弦钢管，2-钢腹杆，3-上弦钢管，4-预应力筋，5-混凝土桥面板，6-连接板，7-混凝土。 In the figure: 1-lower chord steel pipe, 2-steel web bar, 3-upper chord steel pipe, 4-prestressed tendon, 5-concrete bridge deck, 6-connecting plate, 7-concrete.
具体实施方式 Detailed ways
如图1~3所示，一种预应力钢管混凝土组合桁梁，包括钢管桁梁和混凝土桥面板5，所述钢管桁梁顶部与混凝土桥面板5底部相连接，所述钢管桁梁由两根平行的上弦钢管3、一根下弦钢管1以及复数根对称连接上弦钢管3和下弦钢管1的钢腹杆2组成，所述下弦钢管1内填充有混凝土7，所述下弦钢管1内铺设有施加预应力的预应力筋4。其中，由图1的横桥向断面图可知，在同一横断面上的两根钢腹杆2关于下弦钢管1中轴线对称；由图2和图3的顺桥向断面图可知，顺桥向上的复数根钢腹杆2均匀分布于上弦钢管3和下弦钢管1之间，例如以W形或N形分布，当然还可以是以其他形式分布。 As shown in Figures 1 to 3, a prestressed steel pipe concrete composite truss includes a steel pipe truss and a concrete deck 5, the top of the steel pipe truss is connected to the bottom of the concrete bridge deck 5, and the steel pipe truss is composed of two It consists of a parallel upper string steel pipe 3, a lower string steel pipe 1 and a plurality of steel web bars 2 symmetrically connecting the upper string steel pipe 3 and the lower string steel pipe 1, the lower string steel pipe 1 is filled with concrete 7, and the lower string steel pipe 1 is laid with Apply prestressed prestressed tendon 4. Among them, it can be seen from the cross-section view of the bridge in Figure 1 that the two steel webs 2 on the same cross-section are symmetrical about the central axis of the lower chord steel pipe 1; The plurality of steel webs 2 are evenly distributed between the upper chord steel pipe 3 and the lower chord steel pipe 1, for example in a W-shape or N-shape, and of course they can also be distributed in other forms.
在本实施例中，所述下弦钢管1直径D为钢腹杆2的2~3倍，所述预应力筋4采用后张法张拉，所述预应力筋4中轴线位于下弦钢管1中轴线下方并且间距为e，e取值于D/6~D/3之间。所述混凝土桥面板5包覆作为受力骨架的上弦钢管3，所述上弦钢管3内填充有混凝土7。所述钢腹杆2为钢管，当剪力较大时可在其内填充混凝土7；当剪力不大时，可为空钢管。当钢腹杆2管径大于上弦钢管3管径时，为了避免上弦钢管3与钢腹杆2连接处的焊接困难，所述钢腹杆2顶部设置有方便其与上弦钢管3相连接的连接板6。 In this embodiment, the diameter D of the lower chord steel pipe 1 is 2 to 3 times that of the steel web 2, the prestressed tendons 4 are stretched by post-tensioning, and the central axis of the prestressed tendons 4 is located in the lower chord steel pipe 1 Below the axis and the distance is e, and the value of e is between D/6~D/3. The concrete bridge deck 5 covers the upper chord steel pipe 3 as a stressed skeleton, and the upper chord steel pipe 3 is filled with concrete 7 . The steel web 2 is a steel pipe, which can be filled with concrete 7 when the shear force is large; and can be an empty steel pipe when the shear force is not large. When the diameter of the steel web 2 is greater than the diameter of the upper chord steel pipe 3, in order to avoid welding difficulties at the joint between the upper chord steel pipe 3 and the steel web 2, the top of the steel web 2 is provided with a connection that facilitates its connection with the upper chord steel pipe 3 board6.
如图1~2所示，一种预应力钢管混凝土组合桁梁的施工方法，按以下步骤进行：（1）采用分段焊接制作下弦钢管1，先按照设计好的位置在下弦钢管1内放置和固定预应力筋4，然后在下弦钢管1内填充混凝土7，当混凝土7强度达到75%时，再张拉预应力筋4以对下弦钢管1施加预应力，避免后期张拉对钢腹杆2产生非平行钢管的拉压力，降低钢腹杆2的初应力；（2）调整好下弦钢管1位置，清理下弦钢管1焊接部位，将钢腹杆2焊接于下弦钢管1上；（3）将上弦钢管3焊接于钢腹杆2上，上弦钢管3与钢腹杆2、下弦钢管1形成作为骨架的钢管桁梁；（4）在钢管桁梁顶部搭设桥面板模板，浇筑混凝土7形成混凝土桥面板5。 As shown in Figures 1 and 2, a construction method for prestressed steel pipe concrete composite truss girders is carried out according to the following steps: (1) The lower string steel pipe 1 is manufactured by segmental welding, and first placed in the lower string steel pipe 1 according to the designed position and fix the prestressed tendons 4, and then fill the concrete 7 in the lower string steel pipe 1, and when the strength of the concrete 7 reaches 75%, stretch the prestressed tendons 4 to apply prestress to the lower string steel pipe 1, so as to avoid post-tensioning on the steel web 2 Generate the tensile pressure of non-parallel steel pipes and reduce the initial stress of the steel web 2; (2) Adjust the position of the lower string steel pipe 1, clean the welding position of the lower string steel pipe 1, and weld the steel web 2 to the lower string steel pipe 1; (3) Weld the upper chord steel pipe 3 to the steel web 2, and the upper chord steel 3, the steel web 2, and the lower chord steel 1 form a steel pipe truss as a skeleton; (4) Build a bridge deck formwork on the top of the steel pipe truss, and pour concrete 7 to form concrete Bridge deck 5.
在步骤（1）中，所述预应力筋4中轴线位于下弦钢管1中轴线下方并且间距为e，e取值于D/6~D/3之间，其中D为下弦钢管1直径；在步骤（2）中，所述下弦钢管1直径D为钢腹杆2的2~3倍，所述钢腹杆2为空钢管，当剪力较大时在空钢管内填充混凝土7；在步骤（3）中，当钢腹杆2管径大于上弦钢管3管径时，为了避免上弦钢管3与钢腹杆2连接处的焊接困难，所述钢腹杆2顶部设置有方便其与上弦钢管3相连接的连接板6；在步骤（4）中，所述混凝土桥面板5包覆上弦钢管3，所述上弦钢管3内填充有混凝土7。 In step (1), the central axis of the prestressed tendons 4 is located below the central axis of the lower chord steel pipe 1 and the distance is e, and the value of e is between D/6~D/3, where D is the diameter of the lower chord steel pipe 1; In step (2), the diameter D of the lower chord steel pipe 1 is 2 to 3 times that of the steel web 2, and the steel web 2 is an empty steel pipe, and when the shear force is large, concrete 7 is filled in the empty steel pipe; in the step In (3), when the diameter of the steel web 2 is larger than the diameter of the upper string steel pipe 3, in order to avoid welding difficulties at the connection between the upper string steel pipe 3 and the steel web 2, the top of the steel web 2 is provided with a 3 connected connecting plates 6; in step (4), the concrete bridge deck 5 covers the upper chord steel pipe 3, and the upper chord steel pipe 3 is filled with concrete 7.
特别需要说明的是，在实际应用过程中，当桥面较宽时，可以安装多个这种预应力钢管混凝土组合桁梁，此时则将多根下弦钢管1连接成一体，多根上弦钢管3也可以连接成一体或者不连接成一体。所述下弦钢管1可以由两根平行且相互连接的细钢管替代，此时钢腹杆2则连接位于同一侧的上弦钢管3和细钢管，焊接时将相应的钢腹杆2焊接在与上弦钢管3同侧的细钢管上。 In particular, it should be noted that, in actual application, when the bridge deck is wide, multiple prestressed steel pipe concrete composite trusses can be installed. 3 can also be connected into one body or not connected into one body. The lower chord steel pipe 1 can be replaced by two parallel thin steel pipes connected to each other. At this time, the steel web 2 is connected to the upper chord steel pipe 3 and the thin steel pipe on the same side. When welding, the corresponding steel web 2 is welded to the upper chord. On the thin steel pipe of steel pipe 3 same side.
以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。 The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.
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| CN105735100A (en) * | 2016-04-20 | 2016-07-06 | 四川省交通运输厅公路规划勘察设计研究院 | Full-steel-pipe concrete composite bridge |
| CN105735102A (en) * | 2016-04-20 | 2016-07-06 | 四川省交通运输厅公路规划勘察设计研究院 | Concrete filled steel tube truss girder and bridge adopting concrete filled steel tube truss girder |
| CN106758750B (en) * | 2017-03-17 | 2018-08-21 | 天津城建大学 | Concrete-filled steel tube truss combination beam and construction method with replaceable floorings |
| CN106836640B (en) * | 2017-03-30 | 2019-01-04 | 贵州大学 | A kind of pre-stressed steel pipe concrete combination beam and preparation method thereof |
| CN107268889B (en) * | 2017-06-26 | 2020-06-05 | 北京交通大学 | Prestressed aluminum-concrete combined truss girder and construction method thereof |
| CN111101442A (en) * | 2020-01-14 | 2020-05-05 | 贵州大学 | Novel long-span plate girder composite structure and construction method thereof |
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