CN106894325A - A kind of deck transverse slope adjusts structure and laying method - Google Patents
A kind of deck transverse slope adjusts structure and laying method Download PDFInfo
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- CN106894325A CN106894325A CN201710305274.5A CN201710305274A CN106894325A CN 106894325 A CN106894325 A CN 106894325A CN 201710305274 A CN201710305274 A CN 201710305274A CN 106894325 A CN106894325 A CN 106894325A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000004575 stone Substances 0.000 claims abstract description 62
- 239000004567 concrete Substances 0.000 claims abstract description 46
- 238000010276 construction Methods 0.000 claims abstract description 8
- 239000011384 asphalt concrete Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000011083 cement mortar Substances 0.000 claims description 10
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
- E01D19/067—Flat continuous joints cast in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
本发明涉及一种桥面横坡调整结构及铺设方法，通过带横坡盖梁、台阶型垫石层、等高度预制梁及调坡桥面铺装层一系列调坡组件实现桥面横坡的设置；此结构适用于上部装配式施工的桥梁，具有宽桥或超高横坡特性的桥梁。每一级垫石顶面水平，保证支座及梁板水平搁置；各梁板顶面台阶错落，形成坡降；板梁间铰缝钢筋混凝土将各装配式梁板连成一体；钢筋混凝土桥面铺装层顶面呈横坡坡面；本发明结构方法合理巧妙、各预制梁板顶面恒载相同，利于预制梁板标准化施工，施工方便；既保证桥面设计横坡，又减小了预制梁板顶面现浇混凝土层自重荷载。
The invention relates to a bridge deck cross-slope adjustment structure and laying method. The bridge deck cross-slope is realized by a series of slope-adjusting components including a cover beam with a cross-slope, a stepped pad stone layer, a prefabricated beam of equal height, and a slope-adjusting bridge deck pavement layer. The setting; this structure is suitable for bridges with prefabricated construction, bridges with wide bridges or super high transverse slope characteristics. The top surface of each level of pad stone is horizontal to ensure that the support and beam slab are placed horizontally; the steps on the top surface of each beam slab are staggered to form a slope; The top surface of the loading layer is a transverse slope; the structure method of the invention is reasonable and ingenious, and the dead load on the top surface of each prefabricated beam slab is the same, which is beneficial to the standardized construction of the prefabricated beam slab and is convenient for construction; it not only ensures the designed transverse slope of the bridge deck, but also reduces the prefabricated The self-weight load of the cast-in-place concrete layer on the top surface of the beam slab.
Description
技术领域technical field
本发明涉及桥梁结构技术领域，具体地说是一种桥面横坡调整结构及铺设方法。The invention relates to the technical field of bridge structures, in particular to a bridge deck transverse slope adjustment structure and a laying method.
背景技术Background technique
桥面横坡的设置主要用于桥面排水需要，通常设置1.5%~2%的桥面横向坡度。其主要用于将桥面上的雨水积水汇流于桥面行车道两侧边缘，再由集水管将雨水集中排出桥面。在板梁顶面浇筑半幅的横坡垫层的后果是：随着行车道数量增加，桥面宽度增大，钢筋混凝土横坡垫层的自重荷载随之增大，且各预制梁顶面的铺装层厚度差增大；另一方面，当桥梁位于线路的弯道上时，为了防止车辆离心滑移倾覆，需要设置更大的桥面超高横坡，钢筋混凝土横坡垫层的自重也随之增大，同时各梁板顶面现浇混凝土厚度也随之不同。桥面宽度的增加及横坡的增大都将使得桥面铺装垫层恒载大大增加，而恒载在桥梁整个荷载效应中占到了60%以上，将导致各梁板设计尺寸差异，桥墩设计尺寸增大以及偏载效应，故应设法减小横坡垫层荷载。The setting of bridge deck cross slope is mainly for the need of bridge deck drainage, usually set 1.5%~2% bridge deck cross slope. It is mainly used to confluence the rainwater accumulated on the bridge deck to the edges of both sides of the bridge deck roadway, and then the rainwater is concentrated and discharged from the bridge deck by the water collecting pipe. The consequences of pouring a half-width cross-slope cushion on the top of the slab girder are: as the number of carriageways increases and the width of the bridge deck increases, the self-weight load of the reinforced concrete cross-slope cushion increases accordingly, and the top surface of each prefabricated beam The thickness difference of the pavement layer increases; on the other hand, when the bridge is located on the curve of the line, in order to prevent the vehicle from centrifugal slipping and overturning, it is necessary to set a larger super-high cross slope of the bridge deck, and the self-weight of the reinforced concrete cross slope cushion also increases. As it increases, the thickness of the cast-in-place concrete on the top surface of each beam and slab is also different. The increase of the width of the bridge deck and the increase of the transverse slope will greatly increase the dead load of the bridge deck pavement, and the dead load accounts for more than 60% of the entire load effect of the bridge, which will lead to differences in the design dimensions of the beams and slabs. Size increase and partial load effect, so we should try to reduce the load of the transverse slope cushion.
发明内容Contents of the invention
针对上述现有技术中桥面宽度的增加及横坡的增大都将使得桥面铺装垫层恒载大大增加，同时带来恒载偏布效应的问题，本发明提供一种桥面横坡调整结构及铺设方法。Aiming at the problem that the increase of the width of the bridge deck and the increase of the transverse slope in the above-mentioned prior art will greatly increase the dead load of the bridge deck pavement cushion, and at the same time bring about the problem of partial distribution of the dead load, the present invention provides a bridge deck transverse slope Adjust the structure and laying method.
为解决上述技术问题，本发明采用的技术方案为：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种桥面横坡调整结构，该结构包括设置在桥墩上的盖梁、垫石层、支座、预制梁板、铰缝、桥面铺装层及沥青混凝土层，所述垫石层设置在盖梁顶部，垫石层沿桥面横坡方向呈台阶式，每个桥墩顶部对应的每一级垫石层台阶上均设有两个顶面及底面均保持水平且厚度相同的支座，每对支座支承在预制梁板一端的底面两侧，且每对支座沿预制梁板宽度方向对称设置，相邻的预制梁板之间设有铰缝，预制梁板的顶部设有桥面铺装层，桥面铺装层上设有沥青混凝土层；所述盖梁的顶面横坡与桥面行车道同坡为i%；所述 桥面铺装层顶面横坡与桥面同坡为i%；所述每一阶垫石层的顶面呈水平状态，且与其上部的预制梁板相对应，台阶端部标高变化处与铰缝的中心线重合对应。A bridge deck cross-slope adjustment structure, the structure includes a cap beam arranged on a bridge pier, a pad stone layer, a bearing, a prefabricated beam slab, hinge joints, a bridge deck pavement layer and an asphalt concrete layer, and the pad stone layer is set On the top of the cover beam, the padding stone layer is stepped along the transverse slope of the bridge deck. On each step of the padding stone layer corresponding to the top of each pier, there are two supports whose top and bottom surfaces are kept horizontal and have the same thickness. , each pair of supports is supported on both sides of the bottom surface of one end of the prefabricated beam slab, and each pair of supports is arranged symmetrically along the width direction of the prefabricated beam slab. The bridge deck pavement layer is provided with an asphalt concrete layer; the top cross slope of the cap beam is i% with the same slope as the bridge deck roadway; the bridge deck pavement top surface cross slope and The same slope of the bridge deck is i%; the top surface of each step pad is horizontal and corresponds to the prefabricated beam slab above it, and the elevation change at the end of the steps coincides with the center line of the hinge joint.
所述相邻两阶垫石层的顶面标高差值为垫石层水平横向宽度与桥面横坡的乘积，变截面垫石层最小厚度不小于8cm。The difference in elevation of the top surface of the two adjacent pad stone layers is the product of the horizontal width of the pad stone layer and the cross slope of the bridge deck, and the minimum thickness of the pad stone layer with variable cross-section is not less than 8cm.
所述预制梁板的高度相等，顶面底面水平，其底板宽度小于每一阶垫石层的宽度1~2cm，即铰缝底部预留缝宽度为1~2cm。The heights of the prefabricated beams and slabs are equal, the top and bottom surfaces are horizontal, and the width of the bottom plate is 1-2 cm smaller than the width of each step of the pad stone layer, that is, the width of the reserved joint at the bottom of the hinge joint is 1-2 cm.
所述的支座为橡胶支座。The support is a rubber support.
所述盖梁、垫石层、铰缝及桥面铺装层均采用混凝土现浇，内置有钢筋网或钢筋骨架。The cover beam, pad stone layer, hinge joint and bridge deck pavement layer are all cast-in-situ concrete, with steel mesh or steel skeleton built in.
所述盖梁混凝土不低于C25，垫石层和铰缝混凝土不低于C40、桥面铺装层混凝土层为C50。The concrete of the cap beam is not lower than C25, the concrete of the pad stone layer and hinge joint is not lower than C40, and the concrete layer of the bridge deck pavement is C50.
一种如上所述的桥面横坡调整结构的铺设方法，包括以下步骤：A method for laying the bridge deck slope adjustment structure as described above, comprising the following steps:
步骤一：浇筑盖梁，盖梁应保证盖梁顶横坡与桥面同坡，控制盖梁顶部两端标高，盖梁浇筑应从标高低侧向高侧进行；Step 1: Pouring the cover beam. The cover beam should ensure that the top cross slope of the cover beam is on the same slope as the bridge deck, and control the elevation of both ends of the top of the cover beam. The pouring of the cover beam should be carried out from the low side to the high side of the elevation;
步骤二：盖梁终凝后，凿毛盖梁顶面，铺1～2cm与盖梁同配比的水泥砂浆；依据桥面横坡计算每一阶垫石层端部高度差，垫石层二次浇筑完成，保证每一阶垫石层顶面水平及设计标高；Step 2: After the cover beam is finally set, chisel the top surface of the cover beam, and spread 1 to 2 cm of cement mortar with the same ratio as the cover beam; calculate the height difference at the end of each step of the pad stone layer according to the cross slope of the bridge deck, and the pad stone layer The second pouring is completed to ensure the level and design elevation of the top surface of each step of the pad stone layer;
步骤三：在垫石层上采用干硬性水泥砂浆抹平，精确定位支座位置，安装支座；每个桥墩顶部对应的每一级垫石层台阶上对称布设两个厚度相同的支座；Step 3: Use dry hard cement mortar to smooth the pad stone layer, accurately locate the position of the support, and install the support; two supports of the same thickness are symmetrically arranged on each step of the pad stone layer corresponding to the top of each pier;
步骤四：准确吊装安放预制梁板于支座上，保证支座顶面与预制梁板底面密贴及预留缝宽度；连接预制梁板之间预留的横向钢筋，布设铰缝钢筋，与预留钢筋焊接固定；用水泥砂浆进行铰缝封底，砂浆强度达50%以后浇筑铰缝混凝土；Step 4: Accurately hoist and place the prefabricated beam slab on the support to ensure that the top surface of the support is closely attached to the bottom surface of the prefabricated beam slab and reserve the width of the joint; Reserve steel bars for welding and fixing; use cement mortar to seal the hinged joints, and pour concrete for hinged joints after the mortar strength reaches 50%;
步骤五：铰缝混凝土浇筑，借助振动溜管保证振捣密实，铰缝混凝土浇筑高度比预制梁板顶面低2cm；混凝土初凝后，对铰缝顶面混凝土进行拉毛处理；Step 5: Concrete pouring of hinged joints, with the help of vibrating chute to ensure compactness of vibration, the height of concrete pouring of hinged joints is 2cm lower than the top surface of prefabricated beams and slabs; after the initial setting of concrete, roughen the concrete on the top surface of hinged joints;
步骤六：浇筑桥面钢筋混凝土铺装层，厚度不小于10cm，顶面形成倾斜坡面i%，等厚度一次浇筑沥青混凝土层至桥面标高，防止施工接缝的出现。Step 6: Pour the bridge deck reinforced concrete pavement layer, the thickness is not less than 10cm, the top surface forms an inclined slope of i%, and pour the asphalt concrete layer to the bridge deck level at one time with equal thickness to prevent the occurrence of construction joints.
本发明的有益效果：Beneficial effects of the present invention:
本发明提供的桥面横坡调整结构及铺设方法，通过带横坡盖梁、台阶型垫石层、等高度预制梁板及调坡桥面铺装层一系列调坡组件实现桥面横坡的设置；此结构适用于上部装配式施工的桥梁，具有宽桥或超高横坡特性的桥梁。每一级垫石顶面水平，保证支座及梁板水平搁置；各梁板顶面台阶错落，形成坡降；板梁间铰缝钢筋混凝土将各装配式梁板连成一体；钢筋混凝土桥面铺装层顶面呈横坡坡面；本发明结构方法合理巧妙、各预制梁板顶面恒载相同，利于预制梁板标准化施工；既保证桥面设计横坡，又减小了预制梁板顶面现浇混凝土层自重荷载；从而减小梁板以及桥梁下部结构的设计尺寸；桥面越宽，弯桥超高越大，节省的桥面横坡现浇混凝土越多，所需的高标号混凝土仅为原来的1/n，n为横桥向预制梁板块数，经济效益明显。The bridge deck cross slope adjustment structure and laying method provided by the present invention realize the bridge deck cross slope through a series of slope adjustment components with cross slope cover beams, stepped pad stone layers, prefabricated beam slabs of equal height and slope adjustment bridge deck pavement layers The setting; this structure is suitable for bridges with prefabricated construction, bridges with wide bridges or super high transverse slope characteristics. The top surface of each level of pad stone is horizontal to ensure that the support and beam slab are placed horizontally; the steps on the top surface of each beam slab are staggered to form a slope; The top surface of the loading layer is a cross-slope slope; the structure method of the invention is reasonable and ingenious, and the dead load on the top surface of each prefabricated beam slab is the same, which is beneficial to the standardized construction of the prefabricated beam-slab; it not only ensures the design cross-slope of the bridge deck, but also reduces the prefabricated beam-slab top. The self-weight load of the surface cast-in-place concrete layer; thereby reducing the design size of the girder slab and the bridge substructure; the wider the bridge deck, the greater the superelevation of the curved bridge, and the more cast-in-place concrete on the transverse slope of the bridge deck is saved, and the required high grade The concrete is only 1/n of the original, and n is the number of prefabricated beam plates in the direction of the transverse bridge, so the economic benefit is obvious.
附图说明Description of drawings
图1为本发明横坡调整结构示意图；Fig. 1 is the structural schematic diagram of slope adjustment of the present invention;
图2为图1的Ⅰ-Ⅰ剖面图；Fig. 2 is the I-I sectional view of Fig. 1;
图3为垫石台阶与铰缝下缘大样图；Fig. 3 is a large sample diagram of the lower edge of the plinth step and hinge joint;
附图标记：1、盖梁，2、垫石层，3、支座，4、预制梁板，5、铰缝，51、预留缝，6、桥面铺装，7、沥青混凝土层。Reference signs: 1. Cover beam, 2. Paving stone layer, 3. Support, 4. Prefabricated beam slab, 5. Hinge joint, 51. Reserved joint, 6. Bridge deck pavement, 7. Asphalt concrete layer.
具体实施方式detailed description
下面结合具体实施方式对本发明做进一步的阐述。The present invention will be further elaborated below in combination with specific embodiments.
如图所示：一种桥面横坡调整结构，该结构包括设置在桥墩上的盖梁1、垫石层2、支座3、预制梁板4、铰缝5、桥面铺装层6及沥青混凝土层7，所述垫石层2设置在盖梁1顶部，垫石层2沿桥面横坡方向呈台阶式，每个桥墩顶部对应的每一级垫石层2台阶上均设有两个顶面及底面均保持水平且厚度相同的支座3，每对支座3支承在预制梁板4一端的底面两侧，且每对支座3沿预制梁板4宽度方向对称设置，相邻的预制梁板4之间设有铰缝5，预制梁板4的顶部设有桥面铺装层6，桥面铺装层6上设有沥青混凝土层7；所述盖梁1的顶面横坡与桥面行车道同坡为i%；所述 桥面铺装层6顶面横坡与桥面同坡为i%；所述每一阶垫石层2的顶面呈水平状态，且与其上部的预制梁板4相对应，台阶端部标高变化处与铰缝5的中心线重合对应；所述相邻两阶垫石层2的标高差值为垫石层2水平横向宽度与桥面横坡的乘积，垫石层2最小厚度不小于8cm；所述预制梁板4的高度相等，顶面底面水平，其底板宽度小于每一阶垫石层2的宽度1~2cm，即铰缝5底部预留缝51宽度为1~2cm；所述盖梁1、垫石层2、铰缝5及桥面铺装6均采用混凝土浇筑，内置有钢筋骨架；所述盖梁1混凝土不低于C25，垫石层2和铰缝5混凝土不低于C40、桥面铺装6混凝土层为C50；桥面沥青混凝土层采用细粒式和中粒式沥青混凝土；沿预制梁板4长度方向，其两端底面各设一组对称布置的支座3，所述支座3为厚度均相等的橡胶支座。As shown in the figure: a bridge deck cross-slope adjustment structure, which includes a cover beam 1, a pad stone layer 2, a support 3, a prefabricated beam slab 4, hinge joints 5, and a bridge deck pavement layer 6 arranged on the bridge pier and the asphalt concrete layer 7, the pad stone layer 2 is arranged on the top of the cap beam 1, the pad stone layer 2 is stepped along the bridge deck transverse slope direction, and each step of the pad stone layer 2 corresponding to the top of each pier is provided with There are two supports 3 whose top and bottom surfaces are kept horizontal and have the same thickness, each pair of supports 3 is supported on both sides of the bottom surface of one end of the prefabricated beam slab 4, and each pair of supports 3 is arranged symmetrically along the width direction of the prefabricated beam slab 4 , hinge joints 5 are arranged between adjacent prefabricated beam slabs 4, and the top of the prefabricated beam slabs 4 is provided with a bridge deck pavement layer 6, and an asphalt concrete layer 7 is arranged on the bridge deck pavement layer 6; the cover beam 1 The top cross slope of the bridge deck is i% with the same slope as the roadway on the bridge deck; the top cross slope of the bridge pavement layer 6 is i% with the same slope as the bridge deck; the top surface of each step pad stone layer 2 is Horizontal state, and corresponding to the prefabricated beam slab 4 on its upper part, the elevation change at the end of the steps coincides with the center line of the hinge joint 5; The product of the lateral width and the cross slope of the bridge deck, the minimum thickness of the padding stone layer 2 is not less than 8cm; the height of the prefabricated beam slab 4 is equal, the top and bottom surfaces are horizontal, and the width of the bottom plate is less than the width of each step of the padding stone layer 2 ~ 1~ 2cm, that is, the width of the reserved seam 51 at the bottom of the hinge joint 5 is 1~2cm; the cover beam 1, the pad stone layer 2, the hinge joint 5 and the bridge deck pavement 6 are all poured with concrete, and a steel skeleton is built in; the cover The concrete of beam 1 is not lower than C25, the concrete of pad stone layer 2 and hinge joint 5 is not lower than C40, and the concrete layer of bridge deck pavement 6 is C50; the bridge deck asphalt concrete layer adopts fine-grained and medium-grained asphalt concrete; In the longitudinal direction of the beam slab 4, a group of symmetrically arranged bearings 3 are provided on the bottom surfaces at both ends thereof, and the bearings 3 are rubber bearings with equal thickness.
盖梁1 的顶面横坡应设计成与此处桥面行车道同坡i%；盖梁可设计为顶面和底面均为坡度相同的盖梁，也可以设计成底面水平，顶面为斜坡的梯形盖梁。The top cross slope of the cover beam 1 should be designed to be the same slope as the bridge deck roadway here; the cover beam can be designed as a cover beam with the same slope on the top and bottom, or can be designed so that the bottom is horizontal and the top is Trapezoidal cap beams for slopes.
垫石层2 须设计成台阶式，每一阶垫石对应一片预制梁板，垫石台阶顶端标高变化处与铰缝5 中心线重合对应；垫石可以设计成分离式的，也可以设计成整体式的；每一阶垫石顶面须保持水平；相邻两阶垫石端部的标高差值为垫石水平长度与桥面横坡的乘积，应保证垫石层最小厚度不小于8厘米，支座下方对应的垫石上部应设置加密钢筋网。Pad stone layer 2 must be designed as steps, and each step of pad stone corresponds to a prefabricated beam slab, and the elevation change at the top of the pad stone step coincides with the centerline of hinge joint 5 correspondingly; the pad stone can be designed as a separate type or as a Integral; the top surface of each step of the pad stone must be kept horizontal; the difference in elevation between the ends of two adjacent pad stones is the product of the horizontal length of the pad stone and the cross slope of the bridge deck, and the minimum thickness of the pad stone layer should not be less than 8 centimeters, and the upper part of the corresponding pad stone under the support should be provided with dense steel mesh.
支座3 位于预制梁板4端部底面两侧，支座应严格定位，并保持顶面底面水平。不得使用带顶坡的支座或球冠支座。支座厚度应相等。The support 3 is located on both sides of the bottom surface of the end of the prefabricated beam slab 4. The support should be positioned strictly and keep the top and bottom surfaces horizontal. Bearings with top slopes or spherical crowns must not be used. The support thickness should be equal.
预制梁板4 梁设计成等高度的，顶面水平的标准化构件，为防止主梁倾斜失稳，应保证主梁构件水平搁置在支座3上。预制梁板4底板宽度应略小于每一阶垫石层2长度约1~2厘米，即铰缝下缘预留缝51宽度，以便于梁板吊装安放，防止相邻梁板安装时挤碰垫石而破坏。Prefabricated beam slab 4 The beam is designed as a standardized component with equal height and a horizontal top surface. To prevent the main beam from tilting and losing stability, it should be ensured that the main beam component is placed horizontally on the support 3. The width of the bottom plate of the prefabricated beam slab 4 should be slightly smaller than the length of the pad stone layer 2 of each step by about 1 to 2 cm, that is, the width of the seam 51 reserved at the lower edge of the hinged joint, so as to facilitate the hoisting and installation of the beam slab and prevent adjacent beams and slabs from being squeezed during installation. Pad stone and destroyed.
相邻的预制梁板4间预留铰缝5，以利于桥梁梁板横向连接，实现荷载的横向分布和桥面平整度。浇筑预制梁板4顶面铺装混凝土，使桥面铺装层顶面形成倾斜坡面i%。铰缝5自上而下设有连接钢筋，连接钢筋可在梁板预制时预埋，铰缝混凝土宜不低于40号。Hinge joints 5 are reserved between the 4 adjacent prefabricated girder slabs to facilitate the lateral connection of the bridge girder slabs and realize the lateral distribution of loads and the flatness of the bridge deck. Concrete is poured on the top surface of the prefabricated beam slab 4, so that the top surface of the bridge deck pavement layer forms an inclined slope i%. The hinged joint 5 is provided with connecting steel bars from top to bottom, and the connecting steel bars can be pre-embedded when the beam and slab are prefabricated, and the hinged joint concrete should not be lower than No. 40.
浇筑铰缝混凝土，待混凝土初凝后，对铰缝顶面混凝土进行拉毛处理；铺装层混凝土从标高低侧向高侧一次浇筑。桥面混凝土铺装包括现浇混凝土层和沥青混凝土层，沥青混凝土层为等厚现浇层。Pour the joint concrete, and after the initial setting of the concrete, roughen the concrete on the top surface of the joint; the pavement concrete is poured from the low side to the high side at one time. The bridge deck concrete pavement includes a cast-in-place concrete layer and an asphalt concrete layer, and the asphalt concrete layer is a cast-in-place layer of equal thickness.
一种如上所述的桥面横坡调整结构的铺设方法，包括以下步骤：A method for laying a bridge deck cross-slope adjustment structure as described above, comprising the following steps:
步骤一：浇筑盖梁，盖梁应保证盖梁顶横坡与桥面同坡，控制盖梁顶部两端标高，盖梁浇筑应从标高低侧向高侧进行；Step 1: Pouring the cover beam. The cover beam should ensure that the top cross slope of the cover beam is on the same slope as the bridge deck, and control the elevation of both ends of the top of the cover beam. The pouring of the cover beam should be carried out from the low side to the high side of the elevation;
步骤二：盖梁终凝后，凿毛盖梁顶面，铺1～2cm与盖梁同配比的水泥砂浆；依据桥面横坡计算每一阶垫石层端部高度差，垫石层二次浇筑完成，保证每一阶垫石层顶面水平及设计标高；Step 2: After the cover beam is finally set, chisel the top surface of the cover beam, and spread 1 to 2 cm of cement mortar with the same ratio as the cover beam; calculate the height difference at the end of each step of the pad stone layer according to the cross slope of the bridge deck, and the pad stone layer The second pouring is completed to ensure the level and design elevation of the top surface of each step of the pad stone layer;
步骤三：在垫石层上采用干硬性水泥砂浆抹平，精确定位支座位置，安装支座；每个桥墩顶部对应的每一级垫石层台阶上对称布设两个厚度相同的支座；Step 3: Use dry hard cement mortar to smooth the pad stone layer, accurately locate the position of the support, and install the support; two supports of the same thickness are symmetrically arranged on each step of the pad stone layer corresponding to the top of each pier;
步骤四：准确吊装安放预制梁板于支座上，保证支座顶面与预制梁板底面密贴及预留缝宽度；连接预制梁板之间预留的横向钢筋，布设铰缝钢筋，与预留钢筋焊接固定；用水泥砂浆进行铰缝封底，砂浆强度达50%以后浇筑铰缝混凝土；Step 4: Accurately hoist and place the prefabricated beam slab on the support to ensure that the top surface of the support is closely attached to the bottom surface of the prefabricated beam slab and reserve the width of the joint; Reserve steel bars for welding and fixing; use cement mortar to seal the hinged joints, and pour concrete for hinged joints after the mortar strength reaches 50%;
步骤五：铰缝混凝土浇筑，借助振动溜管保证振捣密实，铰缝混凝土浇筑高度比预制梁板顶面低2cm。混凝土初凝后，对铰缝顶面混凝土进行拉毛处理；Step 5: Pour hinged concrete, use the vibrating chute to ensure compactness, and the height of hinged concrete poured is 2cm lower than the top surface of the prefabricated beam slab. After the initial setting of the concrete, roughen the concrete on the top surface of the joint;
步骤六：浇筑桥面钢筋混凝土铺装层，厚度不小于10cm，顶面形成倾斜坡面i%，等厚度一次浇筑沥青混凝土层至桥面标高，防止施工接缝的出现。Step 6: Pour the bridge deck reinforced concrete pavement layer, the thickness is not less than 10cm, the top surface forms an inclined slope of i%, and pour the asphalt concrete layer to the bridge deck level at one time with equal thickness to prevent the occurrence of construction joints.
盖梁混凝土浇筑，终凝后将盖梁顶凿毛，直至砼面露出骨料，后浇筑垫石混凝土；防止支座垫石与盖梁顶面粘结不好，发生脱空现象。For the concrete pouring of the cover beam, after the final setting, the top of the cover beam is chiseled until the aggregate is exposed on the concrete surface, and then the pad stone concrete is poured to prevent the support pad stone from being well bonded to the top surface of the cover beam, and the phenomenon of voiding occurs.
支座水平搁置在垫石上；当使用滑动支座时，梁板底面支座接触范围需预埋钢筋及钢板。The support is placed horizontally on the pad stone; when the sliding support is used, the contact range of the support on the bottom surface of the beam and slab needs to be pre-embedded with steel bars and steel plates.
铰缝混凝土通过梁板预埋钢筋将各梁板横向连接为整体。浇筑铰缝混凝土前，将梁板腹板外侧凿毛，用水泥砂浆封底。The hinged concrete connects the beams and slabs horizontally as a whole through the pre-embedded steel bars of the beams and slabs. Before pouring the hinged concrete, the outer side of the web of the beam slab shall be roughened, and the bottom shall be sealed with cement mortar.
桥面铺装层位于梁板及铰缝顶面。浇筑前应凿除梁板及铰缝顶面浮渣、浮浆，高压水冲洗干净，保证桥面铺装层与梁板紧密结合。The bridge deck pavement is located on the top of the girder slab and hinge joints. Before pouring, the scum and laitance on the top surface of beams, slabs and hinge joints should be chiseled off, and washed with high-pressure water to ensure that the bridge deck pavement is closely bonded to the beams and slabs.
桥面现浇混凝土层表面拉毛后，浇筑防水黏结层，可采用改性乳化沥青防水涂料。防水层上再浇筑沥青混凝土面层。After the surface of the cast-in-place concrete layer of the bridge deck is roughened, a waterproof bonding layer can be poured, and the modified emulsified asphalt waterproof coating can be used. The asphalt concrete surface is poured on the waterproof layer.
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Application publication date: 20170627 |