Bridge expansion joints: to meet the requirements of bridge deck deformation, the expansion joint is usually installed between the two beam ends, between the Liang Duan and abutment or the hinge position of the bridge. Requirements of expansion joints in two directions parallel and perpendicular to the axis of the bridge, can free expansion, firm and reliable, the vehicle had to be smooth, no sudden jump and noise; to prevent rainwater and waste soil infiltration obstruction; installation, inspection, maintenance, eliminate dirt to be simple. At the expansion joint, the railing and the bridge deck should be disconnected. The role of bridge expansion joints is to adjust the displacement and connection between the superstructure caused by the vehicle load and the bridge building materials. Once the telescopic device of the skew bridge is damaged, it will seriously affect the speed, comfort and safety of the train, and even cause traffic accidents.
Matters needing attention
1、伸缩装置因受运输长度限制，可分段制造，现场拼接。存放在工地的伸缩装置应平行放置，不得交叉堆放，以防变形。
1, telescopic device due to the length of the transport limit, can be segmented manufacturing, on-site splicing. The telescopic devices stored in the site should be placed in parallel and shall not cross stack to prevent deformation.
2、出厂时，连接卡具仅为运输方便而设，缝隙并不是定位置。伸缩装置安装时，应在监理工程师的认可下方可进行。如设计文件上有规定，以桥梁设计文件所规定的为依据。
2, the factory, connecting fixture only as transport convenience, the gap is not fixed position. The installation of telescopic device should be carried out under the approval of the supervision engineer. If there are provisions in the design documents, it shall be based on the provisions of the bridge design documents.
3、伸缩装置吊装就位前，应将预留槽内的混凝土打毛，清扫干净。安装时伸缩装置顺桥向的宽度a值，应对称放在伸缩缝的间隙上，并使其顶面标高与设计标高吻合后垫平，然后穿放衡向的联接水平钢筋，将伸缩装置上的锚固钢筋与梁上预埋钢筋两侧焊牢（尽量增加焊接点与焊接长度，以延长伸缩装置的使用寿命），放松卡具，使其自由伸缩，此时伸缩装置已进入工作状态。
3. Before installation of telescopic device, the concrete in the reserved groove should be cleaned and cleaned. When installing the expansion device along the width of the bridge to a, said the gap in coping joints, and the top surface elevation and the design elevation after anastomosis connecting pad, and then put on balance to the horizontal bars, the anchor bar and beam expansion device on embedded steel welded on both sides (as length with the increase of welding, welding point to prolong the service life of the device, the telescopic) relax fixture, the free expansion of the expansion device has entered the working state.
4、完成上述工序后，安装必要模板，以防止沙浆流入伸缩缝内，然后认真用水清洗。在混凝土预留槽内浇筑大于C50的混凝土。浇筑混凝土时应采取必要的措施，振捣密实。
4, to complete the process, install the necessary template, in order to prevent the inflow of mortar joints, and then carefully cleaned with water. Pouring concrete larger than C50 in the concrete reserved trough. Concrete measures should be taken when pouring concrete, vibrating compaction.
5、砼初凝后，拔掉模板，及时清除伸缩缝内及异型钢装胶带槽内的异物。 类别 型式 种类 说明 对接式 填塞对接型 沥青、木板填塞型 以沥青、木板、麻絮、橡胶等材料填塞缝隙的构造（在任何状态下，都处于压缩状态） U型镀锌铁皮型 矩形橡胶条型 组合式橡胶条型 管形橡胶条型 嵌固对接型 C型 采用不同形状的钢构件将不同形状橡胶条（带）嵌固，以橡胶条（带）的拉压变形吸收梁变位的构造 CQ型 FQ型 ZF型 钢制 支承式 钢制型 钢梳齿板型 采用面层钢板或梳齿钢板的构造 钢板叠合型 橡胶组合剪切式 板式橡胶型 BF型 将橡胶材料与钢件组合，以橡胶的剪切变形吸收梁的伸缩变位，桥面板缝隙支承车轮荷载的构造 模数 支承式 模数式 XF Ⅱ型 采用异型钢材与橡胶密封带组合的支承式构造 GQF－MZL型 无缝式 暗缝型 TST弹塑体 以路面等变形吸收梁变位的构造。
5, after the initial setting of concrete, pulling out the template, timely removal of expansion joint and foreign steel belt inside the groove. Category type shows butt butt type asphalt, wood packing materials, packing type structure with asphalt and rubber packing board, oakum gap (in any state, are in a compressed state) U type galvanized rectangular rubber strip type combined rubber strip type tubular rubber strip type fixed butt type C the different shapes of the members of different shapes of rubber strip (strip) embedded in the rubber strip (belt), tension and compression deformation of the beam deflection of the absorption structure of CQ type FQ type ZF type steel bearing type steel steel plate with surface plate or comb comb plate structure steel plate laminated type rubber combination shearing plate rubber type BF type rubber material and steel combination, with rubber shearing deformation absorption expansion beam, bridge deck bearing gap The structural modulus of wheel load is supported by modulus type XF II, and the GQF MZL type seamless slit type TST elastic plastic body is formed by the support structure of special-shaped steel and rubber sealing band, and the structure of the beam displacement is absorbed by the pavement deformation.
