一种中低速磁悬浮交通工程承轨梁低置线路与高架桥过渡段结构Transitional section structure of low-line and viaduct of track-bearing beam for medium and low-speed magnetic levitation traffic engineering
本发明属于中低速磁浮交通工程低置线路结构领域，更具体地，涉及一种中低速磁悬浮交通工程承轨梁低置线路与高架桥过渡段结构。The invention belongs to the field of low-profile line structure of medium-low speed maglev traffic engineering, and more particularly relates to a low-line line and viaduct transition section structure of a low-speed magnetic suspension traffic engineering track-bearing beam.
中低速磁悬浮轨道交通属于一种新型交通方式，目前国内外的研究成果较少，全世界开通运营的线路更是少数。目前只有2005年3月日本建设开通的中低速磁悬浮铁路商业运行线-东部丘陵线和2014年6月韩国开通的中低速磁悬浮铁路商务运行线。而中国的中低速磁悬浮交通目前只有国防科技大学试验线、青城山试验线、唐山实验线，但没有投入运营的正式线路，且均以高架结构为主，鲜见有关高架结构与低置线路过渡段结构方面的研究与应用。Medium- and low-speed magnetic levitation rail transit is a new type of transportation. At present, there are few research results at home and abroad, and the number of lines opened and operated in the world is even rare. At present, there is only the commercial operation line of the medium and low-speed magnetic levitation railway opened in March 2005 in Japan - the eastern hilly line and the medium and low speed magnetic levitation railway commercial operation line opened in June 2014 in South Korea. China's medium and low-speed magnetic levitation traffic is currently only the National Defense University of Science and Technology test line, Qingchengshan test line, Tangshan experimental line, but there is no official line of operation, and the main structure is elevated structure, rarely seen the transition between the elevated structure and the low-line line Structural research and application.
在轮轨高速铁路中，存在大量的桥路过渡段路基，高速铁路过渡段路基大多采用了梯形结构，梯形范围内采用了级配碎石掺水泥填筑，并采用了比非过渡段路基更高的压实要求。在已建成的高速铁路运营过程中，桥路过渡段范围，常发生无砟轨道隆起、离缝、冒浆等病害。这种病害的原因，大多是由于过渡段路基仍然是由岩土构成的土工结构物，过渡段路基铺轨后，仍然会发生一定沉降，与桥台存在一定的工后沉降差(规范允许工后沉降差不大于5mm)，由于高速铁路采用无缝线路钢轨，在规范允许工后沉降差范围内，并不影响正常运营，但会导致无砟轨道隆起、离缝、冒浆等病害，需要及时检修维护。In the wheel-rail high-speed railway, there are a large number of bridge transition section subgrades. Most of the high-speed railway transition section subgrades adopt a trapezoidal structure. The trapezoidal range is filled with graded gravel and cement, and the subgrade is more than the non-transition section. High compaction requirements. In the operation process of the completed high-speed railway, the range of the transition section of the bridge road often causes defects such as bulge, sag, and slurry. Most of the causes of this disease are due to the fact that the subgrade of the transition section is still a geotechnical structure composed of rock and soil. After the roadbed of the transition section, some settlement will still occur, and there is a certain post-construction settlement difference with the abutment. The settlement difference is not more than 5mm). Because the high-speed railway adopts seamless line rails, it does not affect the normal operation within the scope of the post-construction settlement difference, but it will lead to the defects of the ballastless track uplift, separation, and slurry. Timely maintenance and repair.
受地形、地质条件等因素影响，质量相对不易控制，在荷载及各种自然环境因素作用下易产生不均匀沉降，难免会发生与高架结构桥台不一致的工后沉降，产生工后沉降差，低置线路与桥台位置出现了沉降差，必然影响F轨的平顺性，甚至可能导致F轨产生错台、变形等问题，严重时，将影响磁浮车辆的正常运营。因此，高速铁路过渡段路基处理方法不能直接用于磁浮交通工程。The F-rail of the medium-low speed maglev traffic line is formed by the short-track of one section and the joints of the track, and the inter-rail seam is reserved to meet the smoothness of the F-track of the maglev train. Guarantee. In the low-line section, the foundation under the bearing beam is a geotechnical structure composed of rock and soil.
Affected by topography, geological conditions and other factors, the quality is relatively difficult to control. Under the action of loads and various natural environmental factors, uneven settlement is easy to occur. It is inevitable that post-construction settlement will be inconsistent with the elevated structure abutment, resulting in post-construction settlement. The settlement difference between the low-line and the abutment position will inevitably affect the smoothness of the F-track, and may even cause problems such as misalignment and deformation of the F-rail. In severe cases, it will affect the normal operation of the maglev vehicle. Therefore, the high-speed railway transition section roadbed treatment method cannot be directly used for maglev traffic engineering.
[发明内容][Summary of the Invention]
针对现有技术的以上缺陷或改进需求，本发明提供了一种用于中低速磁悬浮交通工程的低置线路凸榫承轨梁过渡段结构。该结构既要满足高架结构与低置线路之间的刚度与沉降过渡，保证磁悬浮交通工程高架结构与低置线路过渡段F轨的平顺性要求，又要满足磁浮交通工程低置线路过渡段轨下基础的强度、长期稳定性要求，且施工质量可控性强。In view of the above drawbacks or improvement requirements of the prior art, the present invention provides a low-line tenon bearing beam transition section structure for medium and low speed magnetic levitation traffic engineering. The structure not only needs to meet the rigidity and settlement transition between the elevated structure and the low-line line, but also ensures the smoothness requirement of the F-rail of the elevated structure of the magnetic levitation traffic engineering and the transition section of the low-line line, and also meets the transition section of the low-line line of the maglev traffic engineering. The strength and long-term stability requirements of the foundation are strong, and the construction quality is controllable.
为实现上述目的，按照本发明，提供了一种中低速磁悬浮交通工程承轨梁低置线路与高架桥过渡段结构，其特征在于，包括路基、桥梁桥台、承轨梁、注浆管和排水沟，其中，In order to achieve the above object, according to the present invention, a low-speed line and viaduct transition section structure of a low-speed magnetic suspension traffic engineering track-bearing beam is provided, which is characterized by including a roadbed, a bridge abutment, a bearing beam, a grouting pipe and a drainage Ditch, among them,
所述桥梁桥台包括台背主体和桥台锥体，所述台背主体抵靠在路基上，所述台背主体沿前后方向设置有榫槽，所述榫槽横截面呈倒梯形，所述桥台锥体为两个并且这两个桥台锥体分别设置在所述台背主体的前侧和后侧，并且每个桥台锥体顶部在对应于榫槽的位置均设置所述排水沟，以用于将所述榫槽内的积水排出；The bridge abutment includes a back main body and an abutment cone, the back main body abuts on the roadbed, and the back main body is provided with a tongue and groove in a front-rear direction, and the cross-section of the gutter is inverted trapezoidal. The abutment cones are two and the two abutment cones are respectively disposed on the front side and the rear side of the table back main body, and each abutment cone top is disposed at a position corresponding to the gutter a drain for discharging the accumulated water in the gutter;
所述承轨梁的长度沿左右方向延伸，其包括底板及设置在底板上的上部结构，所述底板埋在路基内，所述底板靠近台背主体的一端向下延伸有与所述榫槽相应的凸榫，所述凸榫放置于所述榫槽内，以使台背主体支撑所述承轨梁，此外，所述凸榫和榫槽上均设置圆角，以使凸榫能在榫槽内转动，从而使承轨梁相对于所述台背主体转动；The length of the rail-bearing beam extends in the left-right direction, and includes a bottom plate and an upper structure disposed on the bottom plate. The bottom plate is buried in the roadbed, and the bottom plate extends downwardly from the end of the main body of the backing body and the gutter a corresponding tenon, the tenon is placed in the gutter so that the back main body supports the rail beam, and further, the tenon and the gutter are provided with rounded corners so that the tenon can Rotating in the gutter to rotate the rail beam relative to the back main body;
沉降时注浆充填路基。The grouting pipe is a plurality of pipes and the grouting pipes are disposed in the roadbed to occur on the roadbed
Grouting fills the roadbed during settling.
优选地，所述路基包括垫层和梯形填筑体，所述垫层采用素混凝土浇注而成并且其设置于所述承轨梁和所述梯形填筑体之间，所述梯形填筑体采用级配碎石掺水泥建筑而成，所述桥梁桥台与所述梯形填筑体之间设置无砂混凝土作反滤层，所述反滤层内设置排水管，以用于将反滤层内的水引出。Preferably, the subgrade comprises a cushion layer and a trapezoidal filling body, the cushion layer is cast from plain concrete and disposed between the rail bearing beam and the trapezoidal filling body, the trapezoidal filling body Constructed with graded gravel and cement, sand-free concrete is provided as a filter layer between the bridge abutment and the trapezoidal filling body, and a drain pipe is arranged in the filter layer for filtering The water in the layer is taken out.
优选地，所述路基靠近榫槽的一端设置有端墙，以用于支撑及遮挡形成的路基的填料。Preferably, the end of the roadbed near the gutter is provided with an end wall for supporting and shielding the filler of the formed roadbed.
优选地，还包括耐磨滑动层，所述耐磨滑动层设置于凸榫与榫槽之间。Preferably, a wear resistant sliding layer is further disposed, the wear resistant sliding layer being disposed between the tenon and the gutter.
优选地，所述排水沟的沟顶与承轨梁底板的底端面平齐，其沟底不高于所述榫槽的槽底，并且所述排水沟的沟宽比所述榫槽的槽底宽度大20cm以上，以便观察所述榫槽的槽底内的情况。Preferably, the ditch top of the gutter is flush with the bottom end surface of the bottom plate of the rail beam, the bottom of the ditch is not higher than the bottom of the trough of the gutter, and the groove width of the gutter is larger than the groove of the gutter The bottom width is 20 cm or more in order to observe the inside of the groove bottom of the gutter.
优选地，所述排水沟的坡度不小于4％。Preferably, the drain has a slope of not less than 4%.
优选地，每根注浆管均采用内径为3cm的不锈钢管并且在不锈钢管上开设多个直径5mm的注浆孔眼，所有的注浆管沿左右方向设置并且每间隔0.6m设置一根。Preferably, each of the grouting pipes is made of a stainless steel pipe having an inner diameter of 3 cm and a plurality of grouting holes having a diameter of 5 mm are formed on the stainless steel pipe, and all the grouting pipes are disposed in the left-right direction and one is disposed at intervals of 0.6 m.
优选地，所述耐磨滑动层由聚酯长丝复合聚乙烯土工膜制成。Preferably, the wear resistant sliding layer is made of a polyester filament composite polyethylene geomembrane.
总体而言，通过本发明所构思的以上技术方案与现有技术相比，能够取得下列有益效果：In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:
(1)将低置线路承轨梁底板靠近高架桥梁的端部设置凸榫，高架桥梁墩台设置榫槽，将低置线路承轨梁凸榫搭接在桥台榫槽中成活动铰接，避免了二者之间因地基处理措施不同造成的沉降错台，确保了磁浮F轨在低置线路与桥台相连位置不会产生错台，有效实现磁悬浮交通工程高架结构与低置线路过渡段F轨的平顺性要求。(1) The bottom of the low-line bearing rail beam is placed near the end of the elevated bridge, and the elevated bridge pier is provided with a gutter, and the low-track bearing girder is lapped in the abutment to form a movable hinge, which avoids The settlement between the two due to the different foundation treatment measures ensures that the magnetic F-rail will not be misplaced at the position where the low-line and the abutment are connected, and effectively realize the F-rail of the elevated structure and the low-line transition of the magnetic levitation traffic engineering. Ride requirements.
差异沉降、温度等荷载作用下可能出现的转动约束，并对磁浮列车传递至桥梁墩台的动应力起缓冲作用，降低了作用在桥台上的动应力与磁浮车辆制动冲击力，同时又避免了因凸榫与榫槽之间相互挤压引起应力集中造成结构的局部承压破坏。(2) The bottom sill of the low-stay line bearing beam is rounded, and the wear-resistant sliding layer is arranged between the bottom sill of the low-line bearing beam and the abutment groove, which releases the bearing beam to some extent.
The rotational constraints that may occur under differential load, temperature and other loads, and the dynamic stress transmitted by the maglev train to the bridge pier and abutment, reduce the dynamic stress acting on the abutment and the braking force of the maglev vehicle, and at the same time The partial pressure damage of the structure caused by the stress concentration caused by the mutual pressing between the tenon and the gutter is avoided.
(3)高架桥台后低置线路承轨梁下垫层底与垫层下的土工基础间预埋注浆管，当承轨梁下的土工基础发生过大沉降导致承轨梁与梁下土工基础发生离缝时，可通过预埋的注浆管进行注浆封堵充填离缝，使低置线路承轨梁与梁下土工基础密贴，避免了承轨梁因底部离缝导致的结构受力不均带来的危害，保证了承轨梁结构的耐久性与长期安全性。(3) Pre-buried grouting pipe between the bottom of the underlying layer of the low-line bearing beam and the geotechnical foundation under the cushion under the viaduct, when the geotechnical foundation under the bearing beam is over-settled, the bearing beam and the geotechnical under the beam are caused. When the foundation is separated from the seam, the pre-buried grouting pipe can be used to grout block and fill the gap, so that the low-line bearing beam and the geotechnical foundation under the beam are closely attached, which avoids the structural damage of the bearing beam due to the bottom separation. The harm caused by uneven force ensures the durability and long-term safety of the rail beam structure.
(4)低置线路承轨梁两侧对应桥台榫槽位置设置排水沟，靠低置线路侧设置端墙，端墙与桥台榫槽排水沟做成整体，既有利于桥台榫槽中的水及时排出，又有利于承轨梁凸榫与桥台凸榫凹槽检修与维护，保证其长期使用功能。(4) Drainage ditch is provided at the position of the corresponding abutment groove on both sides of the low-track bearing beam, and the end wall is arranged on the lower line side. The end wall is integrated with the abutment gutter drainage ditch, which is beneficial to the abutment gutter. The timely discharge of water in the middle is beneficial to the overhaul and maintenance of the bearing beam crown and the abutment groove to ensure its long-term use function.
[附图说明][Description of the Drawings]
图1是本发明的纵断面示意图；Figure 1 is a schematic longitudinal sectional view of the present invention;
图2是本发明中榫槽处的细节部分结构示意图；Figure 2 is a schematic view showing the structure of a detail portion of the gutter in the present invention;
图3是图1中沿I-I线的断面示意图；Figure 3 is a schematic cross-sectional view taken along line I-I of Figure 1;
图4是图1中沿II-II线的断面示意图；Figure 4 is a schematic cross-sectional view taken along line II-II of Figure 1;
图5是本发明中端墙与排水沟的示意图。Figure 5 is a schematic view of an end wall and a drain in the present invention.
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Further, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
桥过渡段结构，包括路基、桥梁桥台2、承轨梁1、注浆管5和排水沟7，其中，Referring to Figures 1 to 5, a medium and low speed magnetic levitation traffic engineering bearing beam 1 low line and overhead
Bridge transition section structure, including subgrade, bridge abutment 2, rail-bearing beam 1, grouting pipe 5 and drainage ditch 7, wherein
所述桥梁桥台2包括台背主体2.1和桥台锥体2.3，所述台背主体2.1抵靠在路基上，所述台背主体2.1沿前后方向设置有榫槽2.2，所述榫槽2.2横截面呈倒梯形，所述桥台锥体2.3为两个并且这两个桥台锥体2.3分别设置在所述台背主体2.1的前侧和后侧，并且每个桥台锥体2.3在对应于榫槽2.2的位置均设置所述排水沟7，以用于将所述榫槽2.2内的积水排出；优选地，还包括耐磨滑动层3，所述耐磨滑动层3设置于凸榫1.3与榫槽2.2之间，避免凸榫1.3和台背主体2.1的磨损另外，所述排水沟7的坡度不小于4％，以便于将榫槽2.2内的水排出。优选地，所述耐磨滑动层3由聚酯长丝复合聚乙烯土工膜制成。The bridge abutment 2 includes a base body 2.1 and an abutment cone 2.3. The base body 2.1 abuts against a roadbed. The platform body 2.1 is provided with a tongue and groove 2.2 in the front-rear direction. The cross section is in an inverted trapezoidal shape, the abutment cones 2.3 are two and the two abutment cones 2.3 are respectively disposed on the front side and the rear side of the table back main body 2.1, and each abutment cone 2.3 is The drainage groove 7 is disposed at a position corresponding to the gutter 2.2 for discharging the accumulated water in the gutter 2.2; preferably, further comprising a wear-resistant sliding layer 3, the wear-resistant sliding layer 3 being disposed on Between the tenon 1.3 and the gutter 2.2, the wear of the tenon 1.3 and the back main body 2.1 is avoided. In addition, the ditch 7 has a slope of not less than 4% in order to discharge the water in the gutter 2.2. Preferably, the wear resistant sliding layer 3 is made of a polyester filament composite polyethylene geomembrane.
所述承轨梁1包括底板1.2及设置在底板1.2上的上部结构1.1，所述底板1.2埋在路基内，所述底板1.2靠近台背主体2.1的一端向下延伸有与所述榫槽2.2相应的凸榫1.3，所述凸榫1.3放置于所述榫槽2.2内，以使台背主体2.1支撑所述承轨梁1，此外，所述凸榫1.3和榫槽2.2上均设置圆角，以使凸榫1.3能在榫槽2.2内转动，从而使承轨梁1相对于所述台背主体2.1转动；凸榫1.3能在榫槽2.2内能发生比较微小的相对位移转动，能对磁浮列车传递至桥梁墩台的动应力起缓冲作用，降低了作用在桥台上的动应力与磁浮车辆制动冲击力，同时又避免了因凸榫与榫槽之间相互挤压引起应力集中造成结构的局部承压破坏。The rail-bearing beam 1 includes a bottom plate 1.2 and an upper structure 1.1 disposed on the bottom plate 1.2. The bottom plate 1.2 is buried in the roadbed. The bottom plate 1.2 extends downwardly from the end of the base back main body 2.1 with the gutter 2.2. Corresponding tenons 1.3, the tenons 1.3 are placed in the gutters 2.2 such that the back main body 2.1 supports the rail-bearing beams 1, and further, the tenons 1.3 and the gutters 2.2 are provided with rounded corners So that the tenon 1.3 can rotate in the gutter 2.2, so that the bearing beam 1 rotates relative to the back main body 2.1; the tenon 1.3 can rotate relatively small relative displacement in the gutter 2.2, can The dynamic stress transmitted by the maglev train to the bridge abutment acts as a buffer, which reduces the dynamic stress acting on the abutment and the braking force of the maglev vehicle, and avoids the stress concentration caused by the mutual compression between the tenon and the gutter. Cause local compression damage of the structure.
所述注浆管5为多根并且这些注浆管5设置于所述路基内，以在路基发生沉降时注浆充填路基。The grouting pipe 5 is a plurality of pipes and the grouting pipes 5 are disposed in the roadbed to grout fill the roadbed when the subgrade is settled.
将反滤层内的水引出，优选地，所述注浆管5设置于所述垫层4内。Further, the subgrade includes a mat layer 4 and a trapezoidal filling body 6 , the mat layer 4 is cast from plain concrete and disposed between the rail bearing beam 1 and the trapezoidal filling body 6 The trapezoidal filling body 6 is constructed by using a graded gravel and cement. A sand-free concrete is disposed between the bridge abutment 2 and the trapezoidal filling body 6 as a filter layer, and a drain pipe is arranged in the filter layer. For use in
The water in the filter layer is taken out. Preferably, the grouting tube 5 is disposed in the mat 4.
进一步，所述路基靠近榫槽2.2的一端设置有端墙8，以用于支撑及遮挡形成的路基的填料，防止填料进入排水沟7内，影响排水沟7的排水与承轨梁凸榫1.3及桥台榫槽2.2的检修维护。Further, the end of the roadbed near the gutter 2.2 is provided with an end wall 8 for supporting and shielding the filling of the formed roadbed, preventing the filler from entering the drainage ditch 7, affecting the drainage of the drainage ditch 7 and the bearing beam convex 1.3 and the bridge Inspection and maintenance of the rafter 2.2.
进一步，所述排水沟7的沟顶与承轨梁1底板1.2的底端面平齐，其沟底不高于所述榫槽2.2的槽底，并且所述排水沟7的沟宽比所述榫槽2.2的槽底宽度大20cm以上，以便观察所述榫槽2.2的槽底内的情况。Further, the ditch top of the drain groove 7 is flush with the bottom end surface of the bottom plate 1.2 of the rail beam 1, the bottom of the groove is not higher than the bottom of the groove of the gutter 2.2, and the groove width of the gutter 7 is larger than The groove bottom width of the gutter 2.2 is larger than 20 cm in order to observe the inside of the groove bottom of the gutter 2.2.
进一步，每根注浆管均水平设置，其采用内径为3cm的不锈钢管并且在不锈钢管上开设多个直径5mm的注浆孔眼，所有的注浆管沿左右方向设置并且每间隔0.6m设置一根。当承轨梁下土工基础发生沉降，承轨梁底有离缝时，通过预埋的注浆管注浆充填，避免因地基沉降引起承轨梁底脱空恶化承轨梁的受力条件。Further, each of the grouting pipes is horizontally disposed, and a stainless steel pipe having an inner diameter of 3 cm is used and a plurality of grouting holes having a diameter of 5 mm are opened on the stainless steel pipe, and all the grouting pipes are arranged in the left-right direction and are disposed at intervals of 0.6 m. root. When the geotechnical foundation under the bearing beam is set off and the bottom of the bearing beam is separated from the joint, it is filled with grouting through the pre-buried grouting pipe to avoid the condition of the bearing beam being deteriorated due to the grounding of the bearing beam.
承轨梁1由承轨梁上部结构1.1、承轨梁底板1.2组成，承轨梁底板靠桥台的端部设置凸榫1.3；桥梁桥台2的台背2.1在承轨梁凸榫对应位置设置桥台榫槽2.2，承轨梁凸榫1.3搭接在桥梁桥台榫槽2.2中。低置线路承轨梁凸榫1.3搭接在桥台榫槽2.2处，受力模式为铰接，可释放低置线路承轨梁的转动约束，保留了竖向和纵向约束，可释放温度力，避免了承轨梁发生翘曲、开裂；同时，低置线路承轨梁与桥台搭接位置沉降一致，避免了桥台2与低置线路承轨梁结构1间产生错台沉降；低置线路承轨梁另一端埋置于稳定的低置线路结构中，其沉降与低置线路结构一致，由于低置线路结构经地基处理及填筑压实后沉降值处于可控范围内，因此，承轨梁两端之间的沉降位于桥台2与低置线路结构之间，接近线性变化，从而实现了高架桥梁结构与低置线路结构间的沉降过渡，也避免了错台，为效保证了过渡段范围F轨的平顺性。The bearing beam 1 is composed of the upper structure of the bearing beam 1.1 and the bottom plate 1.2 of the bearing beam. The bottom of the bearing beam is arranged by the end of the abutment 1.3; the back of the bridge abutment 2 is set at the corresponding position of the bearing of the bearing beam The sill groove 2.2, the bearing beam sill 1.3 overlaps the bridge abutment sill 2.2. The low-profile track-bearing beam truss 1.3 is lapped at the abutment sill 2.2, and the force mode is hinged, which can release the rotation constraint of the low-line track-bearing beam, retaining the vertical and vertical restraints, releasing the temperature force and avoiding the bearing. The rail beam is warped and cracked. At the same time, the low-line bearing beam and the abutment overlap position are consistent, which avoids the staggered settlement between the abutment 2 and the low-line bearing beam structure 1; The other end of the beam is buried in a stable low-line structure, and its settlement is consistent with the low-line structure. Because the low-line structure is under the controllable range after foundation treatment and compaction, the bearing beam is covered. The settlement between the two ends is located between the bridge 2 and the low-line structure, which is close to linear change, thus realizing the settlement transition between the elevated bridge structure and the low-line structure, and avoiding the misalignment, ensuring the transition section effectively. The smoothness of the range F rail.
处理，通过耐磨滑动层3的作用，可一定程度上释放了承轨梁1在差异沉降、温度等荷载作用下可能出现的转动约束，并对磁浮列车传递至桥梁墩台2的动应力起缓冲作用，也避免了承轨梁凸榫1.3与桥台榫槽2.2间的磨损，同时避免了因凸榫1.3与桥台榫槽2.2之间相互挤压引起应力集中造成结构的局部承压破坏。The wear-resistant sliding layer 3 is disposed between the bearing beam tenon 1.3 and the bridge abutment 2 groove 2.2, the head position of the bearing beam tenon 1.3 is rounded, and the bridge abutment 2 groove 2.2 is also rounded.
Through the action of the wear-resistant sliding layer 3, the rotation constraint of the bearing beam 1 under the load of differential settlement and temperature can be released to some extent, and the dynamic stress transmitted by the maglev train to the bridge pier 2 is buffered. The function also avoids the wear between the rail beam crown 1.3 and the abutment chute 2.2, and avoids the local bearing damage caused by the stress concentration caused by the mutual pressing between the tenon 1.3 and the abutment chute 2.2.
排水沟7对应桥台榫槽2.2设置在两侧桥台锥体2.3顶部，沟顶与承轨梁底板底平齐，沟底不高于榫槽底，沟底宽每侧大于榫槽底不少于10cm，一方面方便榫槽中水顺利排出，另一方面便于承轨梁凸榫与桥台榫槽的检查与维护。排水沟横向排水坡不小于4％，并经路基边坡排水槽排出路基坡脚外。The drainage channel 7 corresponding to the abutment groove 2.2 is arranged on the top of the abutment cone 2.3 on both sides, the top of the groove is flush with the bottom of the bottom plate of the bearing beam, the bottom of the groove is not higher than the bottom of the groove, and the width of the bottom of the groove is larger than the bottom of the groove. Less than 10cm, on the one hand, it facilitates the smooth discharge of water in the gutter, and on the other hand, it is convenient for inspection and maintenance of the bearing beam and the abutment gutter. The lateral drainage slope of the drainage ditch is not less than 4%, and is discharged outside the foot of the roadbed through the drainage channel of the subgrade slope.
端墙8设置在排水沟7靠近低置线路的一侧，端墙8顶部平低置线路回填层顶面，端墙8基础底位于排水沟7底不少于20cm，端墙8与排水沟7一般采用C25混凝土整体浇筑，二者之间采用钢筋连接。The end wall 8 is disposed on the side of the drainage channel 7 adjacent to the low line, the top of the end wall 8 is flat and the top surface of the line backfill layer, and the base of the end wall 8 is located at the bottom of the drainage channel 7 not less than 20 cm, the end wall 8 and the drainage ditch 7 Generally, C25 concrete is poured in one piece, and the two are connected by steel bars.
低置线路承轨梁下土工基础参照高速铁路桥路过渡段结构形式设置，梯形填筑体6采用级配碎石掺水泥填筑，同时满足相应的压实要求以及地基处理沉降控制要求，级配碎石与桥台之间设置无砂混凝土反滤层，同时设置排水管将水引出路基外。The geotechnical foundation under the low-line bearing beam is set according to the structural form of the transition section of the high-speed railway bridge. The trapezoidal filling body 6 is filled with cement with graded gravel and meets the corresponding compaction requirements and grounding settlement control requirements. A sand-free concrete filter layer is arranged between the gravel and the abutment, and a drain pipe is provided to guide the water out of the roadbed.
本发明提出的中低速磁悬浮交通工程承轨梁低置线路与高架桥的过渡段结构，就是将低置线路承轨梁采用凸榫搭接在桥台榫槽中成活动铰接，并在承轨梁凸榫与桥台榫槽间设置滑动耐磨层，承轨梁下预埋注浆管等技术，有效释放了承轨梁在差异沉降、温度等荷载作用下可能出现的转动约束，降低了作用在桥台上的动应力与磁浮车辆制动冲击力，实现了高架结构与低置线路之间的刚度及沉降过渡，避免二者之间产生较大的刚度差异与沉降错台，施工质量易于控制，易于检修维护，能够满足磁浮列车安全、舒适运营对线下基础刚度与沉降平缓过渡、以及长期稳定的要求。The transition section structure of the low-line line and the viaduct of the low-speed magnetic levitation traffic engineering proposed by the invention is that the low-track line bearing beam is erected in the abutment groove by the truss, and is articulated in the bearing beam The sliding wear layer is installed between the abutment groove and the pre-buried grouting pipe under the bearing beam, which effectively releases the rotation constraint of the bearing beam under the differential settlement, temperature and other loads, and reduces the effect on the abutment. The dynamic stress on the upper and the braking force of the maglev vehicle realize the stiffness and settlement transition between the elevated structure and the low-line, avoiding the large difference in stiffness and settlement between the two, and the construction quality is easy to control and easy to control. Maintenance and maintenance can meet the requirements of safe and comfortable operation of maglev trains, smooth transition of foundation stiffness and settlement, and long-term stability.
The specific manufacturing process of the present invention is as follows:
(1)施工高架桥梁结构桥台，浇筑桥梁台身混凝土前做好榫槽模板的制作、定位等工作，施工桥台与桥台榫槽。(1) Construction of elevated bridge structure abutments, preparation of the gutter formwork before the concrete of the bridge body, and construction of the abutment and abutment gutters.
(2)回填桥台基础基坑，平整台后低置线路地段场地，根据地基条件进行必要的地基处理；地基处理完成后，按过渡段设计要求填筑台后低置线路承轨梁下土工基础，台后承轨梁下土工基础与桥台锥体同步填筑施工。填筑时根据各部位填料类型及压实度要求，过渡段范围与非过渡段区同步分层填筑，下一层填筑检测符合要求后再填筑上一层。(2) Backfilling the foundation pit of the abutment, leveling the ground of the low-line section after the platform, and performing the necessary foundation treatment according to the foundation conditions; after the foundation treatment is completed, the geotechnical work of the low-line bearing beam behind the platform is completed according to the design requirements of the transition section. Foundation, the geotechnical foundation under the post-stay track beam and the abutment cone synchronous filling construction. According to the filling type and compaction requirement of each part during the filling, the transition section and the non-transition section shall be layered simultaneously, and the next layer of filling inspection shall meet the requirements before filling the upper layer.
(3)承轨梁下土工基础填筑施工完成后，施工预埋注浆管。预埋注浆管施工时，先在预埋位置开挖一条宽、深均为10cm的槽，槽底夯拍紧密平整后，安放注浆管，承轨梁底横断面范围回填砂砾石，其他范围采用原开挖的土工基础填料回填，并采用小平板碾压机碾压密实。注浆管埋在土中的一端采用铁片焊封堵，另一端露出边坡不少于30cm，注浆管管头采用带丝扣的管帽保护，便于以后连接注浆软管。位于承轨梁底范围的每根注浆管上开设直径5mm的注浆孔眼，孔眼孔距10～15cm，环向3孔，交错布置。(3) After the completion of the filling of the geotechnical foundation under the bearing beam, the pre-buried grouting pipe shall be constructed. When constructing the pre-buried grouting pipe, firstly excavate a groove with a width and a depth of 10cm in the pre-buried position. After the bottom of the trough is tightly leveled, the grouting pipe is placed, and the cross-section of the bottom of the bearing beam is backfilled with gravel, other The range is backfilled with the original excavated geo-based filler and compacted by a small flat roller compactor. The end of the grouting pipe buried in the soil is sealed by iron sheet welding, and the other end is exposed to the slope of not less than 30cm. The pipe head of the grouting pipe is protected by a cap with a threaded buckle, which is convenient for connecting the grouting hose later. A grouting hole with a diameter of 5 mm is placed on each grouting pipe in the bottom of the bearing beam, and the hole spacing is 10-15 cm, and the ring is 3 holes, which are staggered.
(4)进行沉降观测，经沉降评估符合要求后，施工垫层，待承轨梁底板垫层达到设计强度后，铺设耐磨滑动层。(4) After the settlement observation, after the settlement assessment meets the requirements, the construction cushion shall be laid, and the wear-resistant sliding layer shall be laid after the cushion layer of the bearing beam reaches the design strength.
(5)施工承轨梁。根据设计要求，测量定位，安装凸榫承轨梁模板，安装承轨梁端与桥台缝隙间的沥青木丝板及防水层，绑扎钢筋，承轨梁梁体与梁底板下的凸榫一次性浇筑混凝土成形，按设计要求进行混凝土养护，达到设计强度后拆除模板。(5) Construction bearing beam. According to the design requirements, measuring and positioning, installing the truss bearing beam formwork, installing the asphalt wood board and waterproof layer between the bearing beam end and the bridge gap, tying the steel bar, the bearing beam beam body and the convex sill under the beam floor The concrete is poured into concrete, and the concrete is cured according to the design requirements. After the design strength is reached, the template is removed.
(6) Construction of the drainage ditch on both sides of the low-line and the end wall next to the drainage ditch. The drainage ditch and the end wall are formed by concrete concrete pouring construction. After the drainage ditch and the end wall concrete reach the design strength, the formwork is removed and then constructed according to the design requirements. The low-level line is equipped with the backfill layer, the sealing layer and the related ancillary structures on the top surface of the gravel, according to the design and construction of the abutment cone top sealing layer, etc., construction slope protection and drainage engineering.
(7)进行低置线路及高架结构轨排铺设及相关附属工程的安装与施工，施工完毕后即形成中低速磁悬浮交通工程承轨梁低置线路与高架桥过渡段结构。(7) Installation and construction of low-line and elevated structure rails and related ancillary works. After the completion of construction, the transition section of the low-profile and viaduct transition sections of the low-speed magnetic levitation traffic engineering.
Those skilled in the art will appreciate that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention, All should be included in the scope of protection of the present invention.