CN103015304B - Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge - Google Patents

Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge Download PDF

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CN103015304B
CN103015304B CN201310007644.9A CN201310007644A CN103015304B CN 103015304 B CN103015304 B CN 103015304B CN 201310007644 A CN201310007644 A CN 201310007644A CN 103015304 B CN103015304 B CN 103015304B
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box girder
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吴国松
胡嘉鸿
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CHONGQING GUOTONG CIVIL ENGINEERING TECHNOLOGY Co Ltd
Chongqing Jiaotong University
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Abstract

本发明公开了一种内置斜腿刚架预应力混凝土变截面箱梁桥,包括构成箱梁的底板及腹板,变截面箱梁桥箱内设置有一斜腿刚架结构,所述斜腿刚架结构包括内置纵梁和内置斜腿,其内置纵梁由跨中向桥墩方向沿箱梁纵向向上倾斜或弯起设置,在跨中至3L/8截面区段,内置纵梁和底板融为一体,其余部分分离,跨中正弯矩底板索沿内置纵梁上弯布置,所述内置纵梁上所述底板索张拉锚固位置上设置有锯齿块,底板索张拉锚固端在锯齿块处弯起到在箱内,底板索在两个张拉锚固端对称张拉并锚固在锯齿块上。底板索向上的径向力消除或减小二期恒载引起主梁下挠变形影响,箱梁构造受力合理。本发明还提供了一种内置斜腿刚架预应力混凝土变截面箱梁桥的施工方法。

The invention discloses a prestressed concrete variable-section box girder bridge with built-in slanted-leg rigid frame, which comprises a bottom plate and a web plate constituting the box girder. The frame structure includes built-in longitudinal girders and built-in oblique legs. The built-in longitudinal girders are set upwards from the mid-span to the bridge pier along the longitudinal direction of the box girder. In the section from the mid-span to 3L/8, the built-in longitudinal girders and the bottom plate are integrated One piece, the rest of the parts are separated, the mid-span positive moment floor cables are bent upward along the built-in longitudinal girder, the anchorage position of the floor cables on the built-in longitudinal beam is provided with sawtooth blocks, and the anchorage ends of the floor cables are at the sawtooth blocks After being bent into the box, the floor cable is tensioned symmetrically at the two tension anchor ends and anchored on the sawtooth block. The upward radial force of the floor cable eliminates or reduces the effect of the second-stage dead load on the downward deflection of the main girder, and the box girder structure bears a reasonable force. The invention also provides a construction method of a prestressed concrete variable-section box girder bridge with built-in oblique-leg rigid frame.

Description

内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法Prestressed concrete variable section box girder bridge with built-in slanted leg rigid frame and its construction method

技术领域technical field

本发明涉及土木工程桥梁技术领域,更具体地说,涉及一种内置斜腿刚架预应力混凝土变截面箱梁桥,以及其施工方法。The invention relates to the technical field of civil engineering bridges, more specifically, to a prestressed concrete variable-section box girder bridge with built-in oblique-leg rigid frame and a construction method thereof.

背景技术Background technique

大跨预应力混凝土变截面箱梁桥是目前广泛采用的桥型,以连续梁和连续刚构桥最为多见,常采用挂篮悬臂浇筑法施工。图1为现有技术中一种大跨预应力混凝土变截面箱梁桥的立面布置图,为连续刚构桥,跨中梁高小于位于桥墩06处的支点梁高,底部为箱梁底板01,主梁下缘立面为坦拱形,桥梁采用分段挂篮悬臂现浇工艺施工。其包括跨中合拢段08、边跨合拢段09、墩顶节段箱梁011和边跨现浇段010及挂篮悬臂现浇部分,其中相邻的跨中合拢段08之间为墩顶节段箱梁011及挂篮悬臂现浇部分,桥梁两端为边跨现浇段010。墩顶节段箱梁011采用墩顶托架现浇,以后采用挂篮悬臂现浇至跨中合拢段08和边跨合拢段09侧面处,边跨现浇段010在支架上现浇完成,再进行边跨合拢段09施工,最后进行跨中合拢段08的施工。Long-span prestressed concrete variable-section box-girder bridges are widely used bridge types at present, and continuous beams and continuous rigid-frame bridges are the most common, and they are often constructed by hanging basket cantilever casting method. Figure 1 is a facade layout diagram of a long-span prestressed concrete variable-section box girder bridge in the prior art, which is a continuous rigid frame bridge, the mid-span girder height is less than the fulcrum girder height at pier 06, and the bottom is the box girder floor 01. The facade of the lower edge of the main girder is in the shape of a flat arch, and the bridge is constructed using the cantilever cast-in-place technique of segmented hanging baskets. It includes the mid-span closing section 08, the side-span closing section 09, the pier top segment box girder 011, the side-span cast-in-place section 010 and the cantilever cast-in-place part of the hanging basket, among which the adjacent mid-span closing section 08 is the pier top Segmental box girder 011 and hanging basket cantilever cast-in-place part, and both ends of the bridge are side-span cast-in-place section 010. The box girder 011 of the pier top section is cast-in-situ by the pier top bracket, and then it is cast-in-situ by hanging basket cantilever to the side of the mid-span closing section 08 and side-span closing section 09, and the side-span cast-in-place section 010 is completed on the support. Then carry out the construction of side-span closing section 09, and finally carry out the construction of mid-span closing section 08.

如图3至图5所示,现有技术这种变截面箱梁桥目前常用的截面形式为单箱单室截面,由于纵向受力需要,梁高由跨中L/2截面向支点截面不断加大,导致底板01下缘立面成拱形,由跨中向桥墩06处悬臂根部支点方向,箱室净空加大,梁高加大,底板01逐渐加厚,腹板02在靠近支点截面亦局部加厚,底板01立面纵向为拱形,底板01拱形矢跨比(矢高/主跨跨径)一般为1/20左右。用于锚固底板索05的锯齿块03设置在腹板02和底板01的结合转角处,以简短传力路线。如图13至图16所示,现有技术中其钢索纵向布置方式是:顶板负弯矩索水平布置,锚固在靠近腹板02处,腹板索07下弯布置提供一定的向上的抗剪分力,跨中正弯矩底板索05下弯布置在底板01内,底板索05锚固在锯齿块03上,底板索05下弯布置,底板索05立面为与底板01一致的拱形,矢跨比(矢高/底板索跨径)一般亦为1/20左右。因此拱形的底板索05在受拉力时会产生向下的径向力,锚固端远离跨中的底板索05向下的径向力大。As shown in Figures 3 to 5, the commonly used cross-section form of this kind of variable-section box girder bridge in the prior art is a single-box single-chamber cross-section. Increase, resulting in the lower edge of the bottom plate 01 arched, from the mid-span to the direction of the cantilever root fulcrum at the pier 06, the clearance of the box room is increased, the beam height is increased, the bottom plate 01 is gradually thickened, and the web 02 is close to the fulcrum section It is also partially thickened. The longitudinal elevation of the base plate 01 is arched, and the arched rise-span ratio of the base plate 01 (sag height/main span diameter) is generally about 1/20. The sawtooth block 03 for anchoring the bottom plate cable 05 is arranged at the combined corner of the web 02 and the bottom plate 01 to shorten the force transmission route. As shown in Figures 13 to 16, the longitudinal arrangement of the steel cables in the prior art is: the negative moment cables on the roof are arranged horizontally, anchored near the web 02, and the downward bending arrangement of the web cables 07 provides a certain upward resistance. Shear component force, mid-span positive bending moment bottom plate cable 05 is bent down inside the bottom plate 01, bottom plate cable 05 is anchored on the sawtooth block 03, bottom plate cable 05 is bent down, the elevation of the bottom plate cable 05 is in the same arch shape as the bottom plate 01, The rise-to-span ratio (sagittal height/cable span of the bottom plate) is generally about 1/20. Therefore, the arched bottom cable 05 will generate a downward radial force when it is under tension, and the downward radial force of the bottom cable 05 whose anchoring end is far away from the mid-span is large.

当桥梁跨径增大时,现有技术是采用增加梁高、加厚底板01、加厚腹板02、增加配置底板索05等措施,而增加梁高、增加配索,下弯底板索05的径向合力进一步加大,这种构造不合理导致受力不利的问题,桥的跨径越大这种问题越严重,制约着该类桥梁的发展。When the bridge span increases, the existing technology adopts measures such as increasing the beam height, thickening the bottom plate 01, thickening the web plate 02, and increasing the configuration of the bottom plate cable 05, and increasing the beam height, increasing the distribution cable, and bending the bottom plate cable 05 The radial resultant force of the bridge is further increased, and this unreasonable structure leads to the problem of unfavorable force bearing. The larger the span of the bridge, the more serious this problem is, which restricts the development of this type of bridge.

如图6至图12所示为了解决上述问题设计了一种桥梁即内置斜腿刚架预应力混凝土变截面箱梁桥(专利号:ZL 200610167317.X),图2为其立面布置图,包括构成箱梁的底板01及腹板02,在变截面箱梁桥箱梁内设置一斜腿刚架结构,斜腿刚架结构由内置纵梁041和内置斜腿042组成;内置纵梁041设在箱梁内跨中底板01相应梁高位置,跨中L/2截面至3L/8截面附近区段底板01和内置纵梁041融为一体,内置纵梁041高度和跨中底板01厚度一致;内置斜腿042一端与内置纵梁041连为一体,其两侧与腹板02连为一体,内置斜腿042和箱梁底板01平行布置,内置斜腿042和底板01径向距离为支点总梁高H的1/4~1/5,内置斜腿042、箱梁底板01和腹板02均采用等截面,厚度均为40~60cm;箱梁底板01下缘线形采用悬连线,净矢跨比为1/7~1/9;跨中正弯矩底板索05沿内置纵梁041水平布置,在底板索05张拉锚固位置的内置纵梁041上设置锯齿块03,底板索05张拉锚固端在锯齿块03处弯起到箱内,底板索05的两个锚固端对称张拉并锚固在锯齿块03上。As shown in Figure 6 to Figure 12, in order to solve the above problems, a bridge is designed, that is, a prestressed concrete variable-section box girder bridge with built-in oblique leg rigid frame (patent number: ZL 200610167317.X), and Figure 2 is its elevation layout. Including the bottom plate 01 and web 02 constituting the box girder, a rigid frame structure with oblique legs is set in the box girder of variable cross-section box girder bridge. Set at the corresponding beam height of the mid-span mid-slab 01 of the box girder, the mid-span L/2 section to the section near the 3L/8 section bottom plate 01 and the built-in longitudinal beam 041 are integrated, and the height of the built-in longitudinal beam 041 is equal to the thickness of the mid-span bottom plate 01 Consistent; one end of the built-in slanted leg 042 is integrated with the built-in longitudinal beam 041, and its two sides are connected with the web 02 as a whole. The built-in slanted leg 042 is arranged in parallel with the bottom plate 01 of the box girder. The radial distance between the built-in slanted leg 042 and the bottom plate 01 is 1/4~1/5 of the total girder height H of the fulcrum, the built-in slanted legs 042, box girder bottom plate 01 and web plate 02 are all of equal cross-section, and the thickness is 40-60cm; the lower edge of box girder bottom plate 01 adopts suspension lines , the net rise-span ratio is 1/7~1/9; the mid-span positive moment floor cable 05 is arranged horizontally along the built-in stringer 041, and the sawtooth block 03 is set on the built-in stringer 041 where the floor cable 05 is tensioned and anchored, and the floor cable 05 The tensioned anchor end is bent into the box at the sawtooth block 03, and the two anchor ends of the floor cable 05 are symmetrically tensioned and anchored on the sawtooth block 03.

现有专利技术“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL 200610167317.X)的主要缺陷或不足表现在:The main defects or deficiencies of the existing patented technology "Prestressed Concrete Variable Section Box Girder Bridge with Built-in Diagonal Leg Frame and Its Construction Method" (patent number: ZL 200610167317.X) are as follows:

(1)底板索05布置和采用悬臂施工法的大跨预应力混凝土变截面箱梁桥的弯矩包络图(一般为抛物线形)不能完全吻合,存在一定偏差。(1) The layout of floor cable 05 and the bending moment envelope diagram (generally parabolic) of the long-span prestressed concrete variable-section box girder bridge using the cantilever construction method cannot be completely consistent, and there is a certain deviation.

(2)为降低边跨墩高节省造价,提高主跨桥下净空或克服跨中下挠,主跨一般设置双向2%左右纵坡,在设置纵坡的桥梁上,为方便设计施工,一般内置纵梁041和桥面平行设置,底板索05布置在双向2%左右纵坡上,底板索05存在部分向下的径向力。(2) In order to reduce the pier height of the side spans and save costs, improve the clearance under the main span bridge or overcome the deflection in the middle of the span, the main span is generally set with a longitudinal slope of about 2% in both directions. On bridges with longitudinal slopes, for the convenience of design and construction, generally The built-in longitudinal girder 041 is arranged parallel to the bridge deck, and the bottom cable 05 is arranged on a longitudinal slope of about 2% in both directions, and there is part of the downward radial force on the bottom cable 05.

(3)不能提供向上的分力,不能平衡二期恒载及车道荷载向下作用力。(3) It cannot provide an upward component force, and cannot balance the second phase dead load and the downward force of the lane load.

(4)未提供消除或减小二期恒载引起主梁下挠变形的控制方法,主跨合拢后变形不易控制。(4) There is no control method to eliminate or reduce the deflection deformation of the main girder caused by the second-stage dead load, and the deformation of the main span is not easy to control after the main span is closed.

(5)在主跨设置双向纵坡的桥梁上,底板索05向下的径向力、一期及二期恒载、车道荷载均向下,加剧混凝土收缩徐变效应,导致跨中运营期一定的持续下挠。(5) On a bridge with a two-way longitudinal slope in the main span, the downward radial force of the floor cable 05, the first-phase and second-phase dead load, and the driveway load are all downward, which intensifies the shrinkage and creep effect of the concrete, resulting in Must continue to scratch.

(6)内置斜腿042和箱梁底板01平行布置,内置斜腿042和底板01径向距离为支点总梁高H的1/4~1/5,大跨径桥梁内置纵梁041和内置斜腿042间距过大,超过5至6米,腹板02稳定性和箱梁抗扭能力欠佳。(6) The built-in slanted leg 042 and the box girder floor 01 are arranged in parallel, the radial distance between the built-in slanted leg 042 and the bottom plate 01 is 1/4 to 1/5 of the height H of the fulcrum, and the built-in longitudinal beam 041 and built-in The distance between the inclined legs 042 is too large, exceeding 5 to 6 meters, and the stability of the web 02 and the torsional capacity of the box girder are not good.

除此之外,现有技术采用悬臂施工法的大跨预应力混凝土变截面箱梁桥主梁合拢后的后续施工工作有以下特点:In addition, the follow-up construction work after the main girder of the large-span prestressed concrete variable-section box girder bridge using the cantilever construction method in the prior art has the following characteristics:

现有技术大跨预应力混凝土变截面箱梁桥的箱梁合拢后进行厚10厘米左右现浇调平混凝土施工、厚10厘米左右沥青混凝土铺装施工、人行道、栏杆或防撞护栏施工。In the prior art, after the box girders of the long-span prestressed concrete variable-section box girder bridge are closed, the construction of cast-in-place leveling concrete with a thickness of about 10 cm, the construction of asphalt concrete pavement with a thickness of about 10 cm, and the construction of sidewalks, railings or anti-collision guardrails are carried out.

厚10厘米左右现浇调平混凝土、厚10厘米左右沥青混凝土铺装、人行道、栏杆或防撞护栏重量一般称为二期恒载。二期恒载施工阶段,底板索05一般张拉完成。二期恒载一般采用混凝土材料,部分桥梁栏杆采用钢结构,自重均较大。The weight of cast-in-place leveling concrete with a thickness of about 10 cm, asphalt concrete pavement, sidewalks, railings or crash barriers with a thickness of about 10 cm is generally called the second-phase dead load. In the phase II dead load construction stage, the floor cable 05 is generally stretched and completed. The second-phase dead load generally adopts concrete materials, and some bridge railings adopt steel structures, and the dead weight is relatively large.

下表列出了二期恒载和公路设计车道荷载的比例关系。二期恒载一般为公路设计车道荷载的2倍左右,消除或减小二期恒载引起主梁下挠变形的影响对提高通行能力、减小施工控制难度意义重大。The following table lists the proportional relationship between the phase II dead load and the design lane load of the highway. The second-stage dead load is generally about twice the design lane load of the highway. Eliminating or reducing the impact of the second-stage dead load on the deflection of the main girder is of great significance for improving traffic capacity and reducing the difficulty of construction control.

发明内容Contents of the invention

针对现有技术的缺陷和不足,本发明的第一个目的在于提供一种跨中正弯矩底板索产生向上的径向力、消除或减小二期恒载引起主梁下挠变形的影响,结构整体刚度大、挠度小、抗剪能力强、布索合理、腹板稳定性和箱梁抗扭能力好、箱梁构造受力合理、施工方便的内置斜腿刚架预应力混凝土变截面箱梁桥。本发明的第二个目的还在于提供一种内置斜腿刚架预应力混凝土变截面箱梁桥的施工方法。Aiming at the defects and deficiencies of the prior art, the first object of the present invention is to provide an upward radial force generated by the mid-span positive moment floor cable to eliminate or reduce the influence of the downward deflection of the main girder caused by the second phase dead load. Prestressed concrete variable-section box with oblique-leg rigid frame built-in oblique-leg rigid frame with built-in slanted-leg rigid frame, which has high overall rigidity, small deflection, strong shear resistance, reasonable cable routing, good web stability and box girder torsion resistance, reasonable box girder structure stress and convenient construction. girder bridge. The second object of the present invention is also to provide a construction method for a prestressed concrete variable-section box girder bridge with built-in oblique-leg rigid frame.

为了达到上述第一个目的,本发明提供如下技术方案:In order to achieve the above-mentioned first object, the present invention provides the following technical solutions:

一种内置斜腿刚架预应力混凝土变截面箱梁桥,包括构成箱梁的底板及腹板,变截面箱梁桥箱内设置有一斜腿刚架结构,所述斜腿刚架结构包括内置纵梁和内置斜腿,所述内置纵梁由跨中向桥墩方向沿箱梁纵向向上倾斜或弯起设置,在跨中L/2截面至3L/8截面区段,所述的内置纵梁和底板融为一体,其余部分内置纵梁与底板分离;A prestressed concrete variable-section box girder bridge with built-in oblique-leg rigid frame, including a bottom plate and a web plate constituting the box girder, and a diagonal-leg rigid frame structure is arranged inside the variable-section box-girder bridge box, and the oblique-leg rigid frame structure includes a built-in Longitudinal girders and built-in oblique legs, the built-in longitudinal girders are set upwardly inclined or bent along the longitudinal direction of the box girder from the mid-span to the pier direction, and in the mid-span L/2 section to 3L/8 section section, the built-in longitudinal girders It is integrated with the bottom plate, and the rest of the built-in longitudinal beams are separated from the bottom plate;

所述内置斜腿一端与所述内置纵梁连接,另一端与所述桥墩连接,其与内置纵梁连接的一端高于与桥墩连接的一端,且所述内置斜腿与桥墩连接的一端的截面位于所述内置纵梁与底板区间梁高的中间并与桥墩的横隔板相连接,所述内置斜腿在L/4截面处箱梁高度的中间部位与所述内置纵梁连接;One end of the built-in slanted leg is connected to the built-in longitudinal girder, and the other end is connected to the pier, the end connected to the built-in girder is higher than the end connected to the pier, and the end of the built-in slanted leg connected to the pier The section is located in the middle of the beam height between the built-in longitudinal beam and the bottom plate and is connected to the diaphragm of the bridge pier, and the built-in inclined leg is connected to the built-in longitudinal beam at the middle part of the box girder height at the L/4 section;

跨中正弯矩底板索沿内置纵梁上弯布置,所述内置纵梁上所述底板索张拉锚固位置上设置有锯齿块,底板索张拉锚固端在锯齿块处弯起到箱内,底板索在两个张拉锚固端对称张拉并锚固在锯齿块上。The mid-span positive bending moment floor cables are bent upward along the built-in longitudinal beams, and sawtooth blocks are arranged on the anchorage positions of the floor cables on the built-in longitudinal beams, and the anchorage ends of the floor cables are bent into the box at the sawtooth blocks. The floor cable is tensioned symmetrically at the two tensioned anchor ends and anchored on the sawtooth block.

优选地,所述内置纵梁在跨中合拢段施工节段为水平布置段,与所述底板分离的分离段向上倾斜布置成斜直线或者曲线,当所述分离段呈曲线向上倾斜时,其锚固点位于同一斜直线上,所述底板索上弯倾斜的倾斜坡率通过所述底板索提供的向上分力能抵消箱梁合拢后期现浇的调平混凝土厚10厘米、沥青混凝土铺装厚10厘米、人行道、栏杆或防撞护栏重量和50%公路设计车道荷载合计计算确定,且所述内置纵梁的水平布置段与上弯的分离段之间设置有曲线过渡段。Preferably, the construction section of the built-in longitudinal beam in the mid-span closing section is a horizontally arranged section, and the separation section separated from the bottom plate is arranged obliquely upward to form a straight line or a curve. When the separation section is curved and upwardly inclined, its The anchor points are located on the same oblique straight line, and the upward component force provided by the floor cables can offset the in-situ leveling concrete thickness of 10 cm and the asphalt concrete pavement thickness of 10 cm through the upward component force provided by the floor cables. 10 cm, the weight of sidewalks, railings or anti-collision guardrails and 50% of the design lane load of the highway are calculated and determined, and a curved transition section is set between the horizontal arrangement section of the built-in longitudinal beam and the upwardly curved separation section.

优选地,所述的内置纵梁靠近桥墩侧的最后一个锯齿块处水平布置,并延伸到桥墩处,内置斜腿在桥墩处设置有墩顶水平段,内置纵梁和内置斜腿均穿过墩顶横隔板分别与相邻跨的内置纵梁和内置斜腿连为一体,内置纵梁的墩顶水平段和桥跨倾斜或上弯段间设置曲线过渡段。Preferably, the built-in longitudinal girder is arranged horizontally near the last sawtooth block on the side of the pier and extends to the pier, the built-in slanted leg is provided with a horizontal section of the pier top at the pier, and both the built-in longitudinal girder and the built-in slanted leg pass through The diaphragm at the top of the pier is respectively connected with the built-in longitudinal beam and built-in slanted leg of the adjacent span, and a curved transition section is set between the horizontal section of the pier top of the built-in longitudinal beam and the inclined or upwardly curved section of the bridge span.

优选地,所述内置纵梁的主跨部分的表面向下凹陷呈凹形抛物线形表面,所述内置纵梁的上部表面向上凸起设置呈凸形抛物线形表面且与所述桥墩的墩顶水平段相连,所述内置纵梁下部与跨中合拢段施工节段的水平段的底板融为一体。Preferably, the surface of the main span part of the built-in stringer is depressed downwards to form a concave parabolic surface, and the upper surface of the built-in stringer is raised upwards to form a convex parabolic surface and is connected to the pier top of the bridge pier. The horizontal sections are connected, and the lower part of the built-in longitudinal beam is integrated with the bottom plate of the horizontal section of the construction section of the mid-span closing section.

优选地,所述内置纵梁和内置斜腿的横向构造钢筋在腹板处弯起并和所述腹板的竖向钢筋焊接牢固或搭接,当采用搭接时,所述内置纵梁和内置斜腿的横向构造钢筋在腹板处弯起,并保证在腹板内的锚固长度为钢筋直径的40倍以上。Preferably, the transverse structural steel bars of the built-in longitudinal girder and built-in slanted legs are bent at the web and welded firmly or overlapped with the vertical steel bar of the web. When lap joint is adopted, the built-in longitudinal beam and The transverse structural reinforcement with built-in oblique legs is bent at the web, and the anchorage length in the web is guaranteed to be more than 40 times the diameter of the reinforcement.

优选地,在底板索布置区段的内置纵梁上的各施工段设置一道横向加强肋。Preferably, a transverse reinforcing rib is provided on each construction section of the built-in stringer of the floor cable arrangement section.

优选地,所述横向加强肋上施加有横向预应力,横向预应力可采用在箱外两端张拉,或采用一端锚固在腹板处混凝土内,另一端弯起到箱内张拉,横向加强肋上施加的横向预应力施工要早于纵向底板索的张拉施工。Preferably, the transverse prestressing rib is applied with transverse prestress, and the transverse prestress can be stretched at both ends outside the box, or one end is anchored in the concrete at the web, and the other end is bent into the box for tension, and the transverse prestress The transverse prestressing construction applied to the stiffeners precedes the tensioning construction of the longitudinal floor cables.

一种内置斜腿刚架预应力混凝土变截面箱梁桥施工方法,桥梁采用挂篮悬臂浇筑法施工,施工时内置纵梁、内置斜腿和箱梁节段一起悬臂现浇,或内置纵梁和内置斜腿推迟一个施工阶段,在箱内支架或吊架上现浇。A construction method for a prestressed concrete variable-section box girder bridge with a built-in slanted leg rigid frame. The bridge is constructed using the hanging basket cantilever pouring method. Delay a construction stage with built-in diagonal legs, cast-in-situ on box supports or hangers.

优选地,底板索的张拉根据跨中标高的变化分多批分阶段进行施工;箱梁合拢后张拉40%,后期现浇的调平混凝土厚10厘米完成后张拉20%,人行道、栏杆或防撞护栏完成后张拉20%,沥青混凝土铺装厚10厘米完成后张拉20%;当不设置调平混凝土时,箱梁合拢后张拉40%,人行道、栏杆或防撞护栏完成后张拉30%,沥青混凝土铺装厚10厘米完成后张拉30%;施工时根据跨中截面测量标高进行上弯底板索张拉过程的动态调整。Preferably, the tensioning of the floor cables is carried out in multiple batches and stages according to the change of the mid-span elevation; the box girder is closed and stretched by 40%, and the cast-in-place leveling concrete in the later stage is 10 cm thick and then stretched by 20%. Railings or anti-collision guardrails are stretched by 20% after completion, asphalt concrete pavement is 10 cm thick and then stretched by 20%; 30% tension after completion, and 30% tension after completion of asphalt concrete pavement with a thickness of 10 cm; during construction, the dynamic adjustment of the tensioning process of the upper curved floor cable is carried out according to the elevation measured at the mid-span section.

同现有专利“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL 200610167317.X)和现有底板索下弯布置大跨预应力混凝土单箱单室变截面箱梁桥结构相比,本发明主要有益效果是:It is the same as the existing patent "Prestressed Concrete Variable Section Box Girder Bridge with Built-in Diagonal Leg Rigid Frame and Its Construction Method" (Patent No.: ZL 200610167317.X) and the existing floor cable downward bending arrangement of large-span prestressed concrete single-box single-chamber substation Compared with cross-section box girder bridge structure, the main beneficial effects of the present invention are:

(1)由于设置了上弯内置纵梁,且底板索被布置于上弯内置纵梁内,使得本发明跨中正弯矩底板索是上弯布置,在各种纵坡布置道路上,通过设置不同的上弯坡率,完全消除了现有底板索下弯布置单箱单室变截面箱梁桥技术跨中正弯矩索向下的径向力,完全消除了主跨设置双向纵坡现有专利“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL200610167317.X)底板索向下的径向力,解决了大跨径变截面箱梁桥跨中正弯矩索向下的径向力随跨径不断加大的难题,可有效解决由径向力引起的变截面箱梁桥跨中底板易出现的顺桥向裂缝、跨中普遍出现的下挠和腹板易出现的主拉应力裂缝问题。(1) Since the up-curved built-in longitudinal beams are provided, and the floor cables are arranged in the up-curved built-in longitudinal beams, the mid-span positive moment floor cables of the present invention are arranged in an upcurve. On roads with various longitudinal slopes, by setting The different upward bending slope ratios completely eliminate the downward radial force of the positive bending moment cables in the mid-span of the single-box single-chamber variable-section box girder bridge with the downward bending arrangement of the floor cables, and completely eliminate the existing two-way longitudinal slope of the main span. Patent "Prestressed Concrete Variable Section Box Girder Bridge with Built-in Diagonal Leg Frame and Its Construction Method" (Patent No.: ZL200610167317.X) The downward radial force of the bottom plate cable solves the problem of the mid-span positive bending of the large span variable section box girder bridge The problem that the downward radial force of the moment cable increases with the span can effectively solve the cracks along the bridge direction that are prone to occur in the mid-span of variable-section box girder bridges caused by radial force, and the common downward deflection and deflection in the mid-span. The main tensile stress crack problem that is easy to appear in the web.

(2)和现有专利“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL 200610167317.X)和现有技术底板索下弯布置单箱单室变截面箱梁桥相比,本发明提供消除或减小二期恒载和车道荷载引起主梁下挠变形的方法。向上的径向力可平衡二期恒载和车道荷载作用,对提高承载通行能力、减小施工控制难度意义重大。(2) and the existing patent "Prestressed Concrete Variable Section Box Girder Bridge with Built-in Diagonal Leg Rigid Frame and Its Construction Method" (Patent No.: ZL 200610167317.X) and the existing technology of single box and single chamber variable cross section arranged with downward bending of floor cables Compared with the box girder bridge, the invention provides a method for eliminating or reducing the deflection deformation of the main girder caused by the secondary dead load and the lane load. The upward radial force can balance the second-stage dead load and the lane load, which is of great significance for improving the carrying capacity and reducing the difficulty of construction control.

(3)本发明底板索布置在上弯内置纵梁内,底板索立面形成凹形抛物线,和采用悬臂施工法的大跨预应力混凝土变截面箱梁桥的弯矩包络图基本吻合,可克服跨中L/2截面至3L/8截面较大的正弯矩,在L/8截面附近能抵抗部分负弯矩。比现有技术底板索下弯布置单箱单室变截面箱梁桥和现有专利“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL200610167317.X)布索和受力均更合理,节省材料,从而带来经济性。(3) The floor cables of the present invention are arranged in the built-in longitudinal girder of the upward bend, and the elevation of the floor cables forms a concave parabola, which is basically consistent with the bending moment envelope diagram of the long-span prestressed concrete variable-section box girder bridge adopting the cantilever construction method, It can overcome the large positive bending moment of the mid-span section L/2 to 3L/8, and can resist part of the negative bending moment near the L/8 section. Compared with the prior art, the single-box single-chamber variable-section box girder bridge with a single-box single-chamber variable-section box girder bridge with downward bending of the floor cable and the existing patent "Prestressed concrete variable-section box girder bridge with built-in oblique leg rigid frame and its construction method" (patent number: ZL200610167317.X) published Cables and forces are more reasonable, saving materials, thus bringing economy.

(4)内置斜腿的下方桥墩根部截面位于内置纵梁与底板区间梁高的中间部位,和内置斜腿与底板平行布置相比改善了腹板的稳定性。(4) The root section of the lower pier with built-in oblique legs is located in the middle of the girder height between the built-in longitudinal girder and the bottom plate, which improves the stability of the web compared with the parallel arrangement of built-in oblique legs and the bottom plate.

(5)在各种纵坡的桥梁上,底板索向上的径向力和一期及二期恒载及车道荷载均相反,可改善混凝土收缩徐变效应,克服跨中运营期的持续下挠。(5) On bridges with various longitudinal slopes, the upward radial force of the floor cables is opposite to the first-phase and second-phase dead loads and lane loads, which can improve the shrinkage and creep effect of concrete and overcome the continuous downward deflection during the mid-span operation period .

(6)本发明桥梁可采用现有技术悬臂浇筑法施工,施工时内置纵梁和内置斜腿可以和箱梁节段一起悬臂现浇,为减轻挂篮悬臂浇筑重量,内置纵梁和内置斜腿也可推迟一个施工阶段在箱内支架或吊架上现浇,施工易于控制。(6) The bridge of the present invention can adopt prior art cantilever pouring method construction, built-in longitudinal beam and built-in slanted leg can cantilever cast-in-situ together with box girder section during construction, in order to reduce hanging basket cantilever pouring weight, built-in longitudinal beam and built-in slanted leg The legs can also be cast in-situ on the brackets or hangers in the box after a construction stage is postponed, and the construction is easy to control.

(7)底板索的张拉根据跨中标高的变化合理范围分多批多阶段进行施工,可实现主跨一期合拢后,桥梁标高基本不变的目标,施工易于控制。(7) The tensioning of the floor cables is carried out in multiple batches and in multiple stages according to the reasonable range of mid-span elevation changes. After the main span is closed in the first stage, the bridge elevation is basically unchanged, and the construction is easy to control.

(8)内置纵梁横向加强肋上施加的横向预应力施工要早于纵向底板索的张拉施工确保了底板不产生纵向开裂。(8) The transverse prestressing construction applied to the transverse rib of the built-in longitudinal beam is earlier than the tensioning construction of the longitudinal floor cables to ensure that the floor does not produce longitudinal cracks.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

图1为现有技术中大跨预应力混凝土变截面箱梁桥的结构示意图;Fig. 1 is the structural representation of long-span prestressed concrete variable section box girder bridge in the prior art;

图2为现有专利内置斜腿刚架预应力混凝土变截面箱梁桥的结构示意图;Fig. 2 is the structural schematic diagram of the prestressed concrete variable section box girder bridge with built-in slanted leg rigid frame of the existing patent;

图3为现有技术大跨预应力混凝土变截面箱梁桥构造图;Fig. 3 is the structural diagram of the prior art long-span prestressed concrete variable section box girder bridge;

图4为图3的B-B剖视图;Fig. 4 is the B-B sectional view of Fig. 3;

图5为图3的A-A剖视图;Fig. 5 is A-A sectional view of Fig. 3;

图6为现有专利内置斜腿刚架预应力混凝土变截面箱梁桥的构造图;Fig. 6 is the structural diagram of the prestressed concrete variable section box girder bridge with built-in slanted leg rigid frame of the existing patent;

图7为图6的A-A剖视图;Fig. 7 is A-A sectional view of Fig. 6;

图8为图6的B-B剖视图;Fig. 8 is the B-B sectional view of Fig. 6;

图9为图6的C-C剖视图;Fig. 9 is a C-C sectional view of Fig. 6;

图10为图6的D-D剖视图;Fig. 10 is a D-D sectional view of Fig. 6;

图11为图6的E-E剖视图;Fig. 11 is the E-E sectional view of Fig. 6;

图12为图6的F-F剖视图;Fig. 12 is the F-F sectional view of Fig. 6;

图13为现有技术大跨预应力混凝土变截面箱梁桥的钢索纵向布置图;Fig. 13 is the longitudinal arrangement diagram of the steel cables of the long-span prestressed concrete variable-section box girder bridge in the prior art;

图14为图13的A-A剖视图;Fig. 14 is A-A sectional view of Fig. 13;

图15为图13的B-B剖视图;Fig. 15 is a B-B sectional view of Fig. 13;

图16为图13的C-C剖视图;Fig. 16 is a C-C sectional view of Fig. 13;

图17为现有专利内置斜腿刚架预应力混凝土变截面箱梁桥的钢索纵向布置图;Fig. 17 is a longitudinal layout diagram of steel cables of a prestressed concrete variable-section box girder bridge with built-in slanted-leg rigid frame of the existing patent;

图18为图17的A-A剖视图;Fig. 18 is the A-A sectional view of Fig. 17;

图19为图17的B-B剖视图;Fig. 19 is a B-B sectional view of Fig. 17;

图20为图17的C-C剖视图;Figure 20 is a C-C sectional view of Figure 17;

图21为本发明内置斜腿刚架预应力混凝土变截面箱梁桥的构造图;Fig. 21 is the structural diagram of the prestressed concrete variable section box girder bridge with built-in slanted leg rigid frame of the present invention;

图22为图21的D-D剖视图;Figure 22 is a D-D sectional view of Figure 21;

图23为图21的E-E剖视图;Fig. 23 is the E-E sectional view of Fig. 21;

图24为图21的F-F剖视图;Fig. 24 is the F-F sectional view of Fig. 21;

图25为图21的A-A剖视图;Fig. 25 is the A-A sectional view of Fig. 21;

图26为图21的B-B剖视图;Figure 26 is a B-B sectional view of Figure 21;

图27为图21的C-C的剖视图;Fig. 27 is the sectional view of C-C of Fig. 21;

图28为本发明内置斜腿刚架预应力混凝土变截面箱梁桥的钢索纵向布置图;Fig. 28 is a longitudinal arrangement diagram of steel cables of a prestressed concrete variable-section box girder bridge with built-in slanted-leg rigid frame in the present invention;

图29为图28的A-A剖视图;Fig. 29 is the A-A sectional view of Fig. 28;

图30为图28的B-B剖视图;Figure 30 is a B-B sectional view of Figure 28;

图31为图28的C-C剖视图。FIG. 31 is a C-C sectional view of FIG. 28 .

附图1-图20中标记如下:Accompanying drawing 1-Fig. 20 mark as follows:

01-底板、02-腹板、03-锯齿块、041-内置纵梁、042-内置斜腿、05-底板索、06-桥墩、07-腹板索、08-跨中合拢段、09-边跨合拢段、010-边跨现浇段、011-墩顶节段箱梁;01-bottom plate, 02-web plate, 03-sawtooth block, 041-built-in stringer, 042-built-in slanted leg, 05-bottom plate cable, 06-pier, 07-web cable, 08-span closing section, 09- Side span closing section, 010-side span cast-in-place section, 011-pier top section box girder;

附图21-图31中标记如下:Accompanying drawing 21-Fig. 31 mark as follows:

1-底板、2-腹板、3-锯齿块、41-内置纵梁、42-内置斜腿、5-底板索、6-桥墩。1-bottom plate, 2-web plate, 3-sawtooth block, 41-built-in stringer, 42-built-in oblique leg, 5-bottom plate cable, 6-pier.

具体实施方式Detailed ways

本发明的第一个目的在于提供一种跨中正弯矩底板索产生向上的径向力、消除或减小二期恒载引起主梁下挠变形的影响,结构整体刚度大、挠度小、抗剪能力强、布索合理、腹板2稳定性和箱梁抗扭能力好、箱梁构造受力合理、施工方便的内置斜腿刚架预应力混凝土变截面箱梁桥。本发明的第二个目的还在于提供一种内置斜腿刚架预应力混凝土变截面箱梁桥的施工方法。The first object of the present invention is to provide an upward radial force generated by the positive moment floor cable at mid-span, which can eliminate or reduce the influence of the downward deflection of the main girder caused by the second-stage dead load. The overall structure has high rigidity, small deflection, and A prestressed concrete variable-section box girder bridge with built-in slanted-leg rigid frame with strong shear capacity, reasonable cabling, good web 2 stability and box girder torsion resistance, reasonable box girder structural stress, and convenient construction. The second object of the present invention is also to provide a construction method for a prestressed concrete variable-section box girder bridge with built-in oblique-leg rigid frame.

下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

请参阅图21-31,本发明实施例提供的内置斜腿刚架预应力混凝土变截面箱梁桥,包括桥墩6及构成箱梁的底板1、腹板2,变截面箱梁桥箱内设置有一斜腿刚架结构,所述斜腿刚架结构包括内置纵梁41和内置斜腿42。Please refer to Figures 21-31, the built-in slanted leg rigid frame prestressed concrete variable section box girder bridge provided by the embodiment of the present invention includes pier 6 and the bottom plate 1 and web 2 constituting the box girder, and the variable section box girder bridge box is arranged There is a rigid frame structure with diagonal legs, and the rigid frame structure with diagonal legs includes built-in longitudinal beams 41 and built-in diagonal legs 42 .

其中内置纵梁41由跨中向桥墩6方向沿箱梁纵向向上倾斜或弯起设置,在跨中L/2截面至3L/8截面区段,所述的内置纵梁41和底板1融为一体,即为实体段,其余部分内置纵梁41与底板1分离;内置斜腿42一端与内置纵梁41连接,另一端与桥墩6连接,其与内置纵梁41连接的一端高于与桥墩6连接的一端,且内置斜腿42与桥墩6连接的一端的截面位于所述内置纵梁41与底板1区间梁高的中间并与桥墩6的横隔板相连接,内置斜腿42在L/4截面处箱梁高度的中间部位与所述内置斜梁连接,优选地内置斜腿42、箱梁底板1和腹板2均采用等截面,厚度均为60cm左右。箱梁底板1下缘线形采用半立方抛物线,净矢跨比(高差/跨径)为1/20左右。Among them, the built-in longitudinal beam 41 is set upwardly inclined or bent from the mid-span to the pier 6 along the longitudinal direction of the box girder. In the mid-span L/2 section to the 3L/8 section section, the built-in longitudinal beam 41 and the bottom plate 1 are integrated One body, that is, a solid section, and the rest of the built-in stringer 41 is separated from the bottom plate 1; one end of the built-in slanted leg 42 is connected to the built-in stringer 41, and the other end is connected to the pier 6, and the end connected to the built-in stringer 41 is higher than the pier 6, and the section of the end of the built-in slanted leg 42 connected to the pier 6 is located in the middle of the beam height between the built-in longitudinal beam 41 and the bottom plate 1 section and connected to the diaphragm of the pier 6, the built-in slanted leg 42 is at L The middle part of the height of the box girder at the /4 section is connected to the built-in slanted beam, preferably the built-in slanted leg 42, the bottom plate 1 and the web 2 of the box girder are all of equal cross-section, and the thickness is about 60 cm. The lower edge of the box girder floor 1 adopts a semi-cubic parabola, and the net rise-span ratio (height difference/span) is about 1/20.

跨中正弯矩底板索5沿内置纵梁41上弯布置,内置纵梁41上底板索5张拉锚固位置上设置有锯齿块3,底板索5张拉锚固端在锯齿块3处弯起到箱内,底板索5在两个张拉锚固端对称张拉并锚固在锯齿块3上。内置斜腿42的上方和内置纵梁41连成一体,内置斜腿42和内置纵梁41两侧方分别与腹板2连成一体,构成空间箱体结构。The mid-span positive bending moment floor cable 5 is bent upward along the built-in longitudinal beam 41, and the anchorage position of the 5-tensioned floor cable on the built-in longitudinal beam 41 is provided with a sawtooth block 3, and the anchorage end of the 5-tensioned floor cable is bent at the sawtooth block 3. In the box, the floor cable 5 is symmetrically tensioned at the two tension anchor ends and anchored on the sawtooth block 3 . The top of the built-in inclined leg 42 is integrated with the built-in longitudinal beam 41, and the two sides of the built-in inclined leg 42 and the built-in longitudinal beam 41 are respectively connected with the web 2 to form a space box structure.

由于设置了上弯内置纵梁41,且底板索5被布置于上弯内置纵梁41内,使得本发明跨中正弯矩底板索5是上弯布置,在各种纵坡布置道路上,通过设置不同的上弯坡率,消除了现有底板索下弯布置单箱单室变截面箱梁桥技术跨中正弯矩索向下的径向力,消除了主跨设置双向纵坡现有专利“内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法”(专利号:ZL 200610167317.X)底板索向下的径向力,解决了大跨径变截面箱梁桥跨中正弯矩索向下的径向力随跨径不断加大的难题,可有效解决由径向力引起的变截面箱梁桥跨中底板易出现的顺桥向裂缝、跨中普遍出现的下挠和腹板易出现的主拉应力裂缝问题。Since the built-in longitudinal girder 41 is provided, and the floor cable 5 is arranged in the built-in longitudinal beam 41, the positive bending moment floor cable 5 in the mid-span of the present invention is arranged in an upward bend. On various longitudinal slope roads, through Different upward bending slope ratios are set to eliminate the downward radial force of the positive bending moment cables in the mid-span of the single-box single-chamber variable-section box girder bridge with the downward bending arrangement of the floor cables, and eliminate the existing patent for setting the two-way longitudinal slope of the main span "Prestressed concrete variable section box girder bridge with built-in oblique leg rigid frame and its construction method" (Patent No.: ZL 200610167317.X) The downward radial force of the floor cable solves the problem of the mid-span positive bending of the large span variable section box girder bridge The problem that the downward radial force of the moment cable increases with the span can effectively solve the cracks along the bridge direction that are prone to occur in the mid-span of variable-section box girder bridges caused by radial force, and the common downward deflection and deflection in the mid-span. The main tensile stress crack problem that is easy to appear in the web.

优选地,在本具体实施方式中,内置纵梁由跨中向桥墩方向按5%的坡率沿箱梁纵向向上倾斜或弯起设置。当然,也可以根据不同的桥梁,采用不同的倾斜坡率。Preferably, in this specific embodiment, the built-in longitudinal girder is arranged to be inclined or bent upward along the longitudinal direction of the box girder at a slope rate of 5% from the mid-span to the bridge pier. Of course, it is also possible to adopt different slope gradients according to different bridges.

优选地,内置纵梁41在跨中合拢段施工节段为水平布置段,与底板1分离的分离段向上倾斜布置成斜直线或者曲线,当分离段呈曲线向上倾斜时,其锚固点位于同一斜直线上,底板索5的上弯倾斜的倾斜坡率通过所述底板索5提供的向上分力能抵消箱梁合拢后期现浇的调平混凝土厚10厘米、沥青混凝土铺装厚10厘米、人行道、栏杆或防撞护栏重量和50%公路设计车道荷载合计计算确定,且所述内置纵梁41的水平布置段与上弯的分离段之间设置有曲线过渡段。Preferably, the construction section of the built-in longitudinal beam 41 in the mid-span closing section is a horizontally arranged section, and the separation section separated from the bottom plate 1 is arranged obliquely straight or curved upward. When the separation section is curved upward, its anchor points are located at the same On the oblique straight line, the upward component force provided by the floor cable 5 can offset the 10 cm thick cast-in-place leveling concrete, 10 cm thick asphalt concrete pavement, and The weight of sidewalks, railings or anti-collision guardrails and 50% of the design lane load of the highway are calculated and determined, and a curved transition section is provided between the horizontally arranged section of the built-in stringer 41 and the upwardly curved separation section.

优选地,内置纵梁41的主跨部分的表面向下凹陷呈凹形抛物线形表面,内置纵梁41的上部表面向上凸起设置呈凸形抛物线形表面且与桥墩的墩顶水平段相连,内置纵梁41下部与跨中合拢段施工节段的水平段底板融为一体。即内置纵梁41与底板1分离的分离段可以为凹形抛物线,与桥墩顶连接的部位为墩顶水平段,与桥墩顶连接的部位的墩顶水平段通过凸形抛物线段与凹形抛物线段连接。Preferably, the surface of the main span part of the built-in stringer 41 is depressed downwards to form a concave parabolic surface, and the upper surface of the built-in stringer 41 is convexly arranged to form a convex parabolic surface and is connected to the horizontal section of the pier top of the pier, The lower part of the built-in longitudinal beam 41 is integrated with the bottom plate of the horizontal section of the construction section of the mid-span closing section. That is, the separation section where the built-in longitudinal girder 41 is separated from the bottom plate 1 can be a concave parabola, the part connected to the top of the pier is the horizontal section of the pier top, and the horizontal section of the pier top at the part connected to the top of the pier passes through the convex parabola section and the concave parabola. section connection.

其中内置纵梁41和内置斜腿42的横向构造钢筋在腹板2处弯起并和腹板2的竖向钢筋焊接牢固或搭接,当采用搭接时,内置纵梁41和内置斜腿42的横向构造钢筋在腹板2处弯起,并保证在腹板2内的锚固长度为钢筋直径的40倍以上。必要时可以在底板索5布置区段的内置纵梁41上各施工段设置一道横向加强肋。必要时横向加强肋上可以施加有横向预应力,横向预应力可采用在箱外两端张拉,或采用一端锚固在腹板2处混凝土内,另一端弯起到箱内张拉,横向加强肋上施加的横向预应力施工要早于纵向底板索5的张拉施工。The horizontal structural steel bars of the built-in longitudinal beam 41 and the built-in slanted leg 42 are bent at the web 2 and welded or overlapped with the vertical steel bar of the web 2 firmly. The 42 transverse structural steel bar is bent at the web 2, and the anchorage length in the web 2 is guaranteed to be more than 40 times the diameter of the steel bar. If necessary, a transverse reinforcing rib can be set at each construction section on the built-in longitudinal beam 41 of the layout section of the floor cable 5 . If necessary, transverse prestress can be applied to the transverse reinforcing ribs, and the transverse prestress can be stretched at both ends outside the box, or one end is anchored in the concrete at 2 places on the web, and the other end is bent into the box for tension, and the transverse reinforcement The transverse prestressing construction applied to the ribs is earlier than the tensioning construction of the longitudinal floor cables 5 .

本发明还提供了一种内置斜腿刚架预应力混凝土变截面箱梁桥施工方法,桥梁采用挂篮悬臂浇筑法施工,施工时内置纵梁41和内置斜腿42和箱梁节段一起悬臂现浇,或内置纵梁41和内置斜腿42推迟一个施工阶段,在箱内支架或吊架上现浇。The present invention also provides a construction method for a prestressed concrete variable-section box girder bridge with a rigid frame with built-in slanted legs. The bridge is constructed by the hanging basket cantilever pouring method. Cast-in-situ, or the built-in longitudinal beam 41 and built-in slanted leg 42 postpone a construction stage, and cast-in-situ on the bracket or hanger in the box.

其中,底板索5的张拉根据跨中标高的变化分多批分阶段进行施工;箱梁合拢后张拉40%,后期现浇的调平混凝土厚10厘米完成后张拉20%,人行道、栏杆或防撞护栏完成后张拉20%,沥青混凝土铺装厚10厘米完成后张拉20%;当不设置调平混凝土时,箱梁合拢后张拉40%,人行道、栏杆或防撞护栏完成后张拉30%,沥青混凝土铺装厚10厘米完成后张拉30%;施工时根据跨中截面测量标高进行上弯底板索5张拉过程的动态调整。Among them, the tensioning of the floor cable 5 is carried out in multiple batches and stages according to the change of the mid-span elevation; the box girder is closed and stretched by 40%, and the cast-in-place leveling concrete is 10 cm thick and stretched by 20% after completion. Railings or anti-collision guardrails are stretched by 20% after completion, asphalt concrete pavement is 10 cm thick and then stretched by 20%; 30% tension after completion, and 30% tension after completion of asphalt concrete pavement with a thickness of 10 cm; during construction, the dynamic adjustment of the 5-tension process of the upper-bend floor cable is carried out according to the elevation measured at the mid-span section.

本说明书中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

需要说明的是,本具体实施方式中所提供的一种内置斜腿刚架预应力混凝土变截面箱梁桥及其施工方法,适用于各种纵坡主跨150至200米宽桥(4至6车道),当然,也不排除在进行其他形式的梁桥设计时采用本具体实施方式中的梁桥和施工方法。It should be noted that the built-in slanted-leg rigid frame prestressed concrete variable-section box girder bridge and its construction method provided in this specific embodiment are applicable to bridges with a main span of 150 to 200 meters on a longitudinal slope (4 to 200 m wide bridges). 6 lanes), certainly, do not rule out adopting the girder bridge and the construction method in this specific embodiment when carrying out the girder bridge design of other forms.

对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge, comprise the base plate (1) and web (2) that form case beam, it is characterized in that, an oblique leg rigid-frame structure is provided with in variable cross-section box girder bridge case, described oblique leg rigid-frame structure comprises built-in longeron (41) and built-in oblique leg (42), described built-in longeron (41) to bridge pier (6) direction along case beam by span centre is longitudinally inclined upwardly or bends up setting, at span centre L/2 cross section to 3L/8 cross section section, described built-in longeron (41) and base plate (1) combine together, the built-in longeron of remainder (41) is separated with base plate (1),
Described built-in oblique leg (42) one end is connected with described built-in longeron (41), the other end is connected with described bridge pier (6), its one end be connected with built-in longeron (41) is higher than the one end be connected with bridge pier (6), and the cross section of one end that described built-in oblique leg (42) is connected with bridge pier (6) is positioned at the centre of described built-in longeron (41) and base plate (1) interval deck-molding and is connected with the diaphragm of bridge pier (6), described built-in oblique leg (42) is connected with described built-in longeron (41) in the middle part of L/4 section case depth of beam,
Positive moment of span central point base plate rope (5) is along the upper curved layout of built-in longeron (41), upper described base plate rope (5) stretch-draw anchor position is provided with sawtooth block (3) to described built-in longeron (41), base plate rope (5) stretch-draw anchor end bends up in case at sawtooth block (3) place, and base plate rope (5) is in the symmetrical stretch-draw of two stretch-draw anchor ends and be anchored on sawtooth block (3).
2. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, described built-in longeron (41) is in the span centre closure segment construction sections section of being arranged horizontally, the segregation section be separated with described base plate (1) is inclined upwardly and is arranged to skew lines or curve, when described segregation section is curved be inclined upwardly time, its anchor point is positioned on same skew lines, the inclination ratio of slope of the upper curved inclination of described base plate rope (5) can be offset case beam by the upwards component that described base plate rope (5) provides and be closed up later stage cast-in-place leveling Concrete Thick 10 centimetres, thick 10 centimetres of asphalt concrete pavement, sidewalk, railing or anticollision barrier weight and 50% Road Design lane load add up to calculating to determine, and be provided with curve transition between the horizontal arrangement section of described built-in longeron (41) and upper curved segregation section.
3. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, described built-in longeron (41) is near last sawtooth block (3) place horizontal arrangement of bridge pier (6) side, and extend to bridge pier (6) place, built-in oblique leg (42) is provided with pier top horizontal segment at bridge pier place, built-in longeron (41) and built-in oblique leg (42) all through pier top diaphragm respectively with adjacent across built-in longeron (41) and built-in oblique leg (42) be connected as a single entity, the pier top horizontal segment of built-in longeron (41) and spanning tilt or arrange curve transition between upper bend section.
4. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1, it is characterized in that, the surface of the main span part of described built-in longeron (41) is concave parabola shape surface to lower recess, the upper face of described built-in longeron (41) raises up and arranges the surface in convex parabola shape and be connected with the pier top horizontal segment of described bridge pier, and the construct base plate (1) of horizontal segment of sections of described built-in longeron (41) bottom and span centre closure segment combines together.
5. the built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 1-4 any one, it is characterized in that, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) bends up at web (2) place also and the vertical reinforced-bar-welding of described web (2) is firm or overlap joint, when adopting overlap joint, the transverse structure reinforcing bar of described built-in longeron (41) and built-in oblique leg (42) bends up at web (2) place, and the anchorage length ensureing in web (2) is more than 40 times of bar diameter.
6. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 5, is characterized in that, arranges that each construction section on the built-in longeron (41) of section arranges horizontal ribs together at base plate rope (5).
7. built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge according to claim 6, it is characterized in that, described horizontal ribs is applied with transverse prestress, transverse prestress can adopt in the outer two ends stretch-draw of case, or adopt one end to be anchored in web (2) place concrete, the other end bends up stretch-draw in case, and the transverse prestress construction that horizontal ribs applies will early than the stretching construction of longitudinal base plate rope (5).
8. a built-in oblique leg rigid-frame prestress concrete variable cross-section box girder bridge construction method, it is characterized in that, bridge adopts Hanging Basket case-in-place cantilever method, during construction, cantilever is cast-in-place together for built-in longeron (41), built-in oblique leg (42) and box girder segment, or built-in longeron (41) and built-in oblique leg (42) postpone a construction stage, cast-in-place on case inner support or suspension bracket;
The stretch-draw of base plate rope (5) divides many batches to construct stage by stage according to the change of span centre absolute altitude; Case beam closes up post tensioning 40%, and later stage cast-in-place leveling Concrete Thick 10 centimetres completes post tensioning 20%, and sidewalk, railing or anticollision barrier complete post tensioning 20%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 20%; When not arranging leveling concrete, case beam closes up post tensioning 40%, and sidewalk, railing or anticollision barrier complete post tensioning 30%, and thick 10 centimetres of asphalt concrete pavement completes post tensioning 30%; Measure according to spaning middle section the dynamic conditioning that absolute altitude carries out upper bent bottom plate rope (5) stretching process during construction.
CN201310007644.9A 2013-01-09 2013-01-09 Prestressed concrete variable-cross-section box girder bridge with internal tilted-leg rigid frame and construction method of prestressed concrete variable-cross-section box girder bridge Expired - Fee Related CN103015304B (en)

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