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某1-0.75米鋼筋混凝土涵管,全长15米計15节,中部11节是頂入法施工,涵洞出入口各明挖两米,直接安装管节。經初步检查达到质量要求,說明頂入法施工基本上是成功的。一、施工設計說明一、頂管設备 1.切割刄 是利用厚6毫米的鋼板制成內径为940毫米圓筒,內焊接∠9×90×8×100的角鋼6个,安装在第一节管的前部。主要作用是减少頂入的阻力及在切割刃內挖土时不致因挖土差誤而造成頂入时方向不正确。頂入完成后取下切割刃可以重复使用。 2. 千斤頂是頂入的动力装置。本涵采用一台50吨油压式千斤頂。但为了預防意外,宜备用一台,以保証施工順利进行。千斤頂的軸綫应平行于涵管的軸,着力点应在管軸的垂直平面內。如采用两台千斤頂时,其位置应在距离底外側約30厘米处其合力着力点亦应在管軸垂直平面內,以保証管节在頂入时不发生偏向。千斤頂应附有压力表,时加观测。 3.导向軌是用来控制管节在頂入时的方向及涵
A 1-0.75 m reinforced concrete culvert, a total length of 15 meters, 15 knots, the central section 11 is the top into the law of construction, culverts and dredges each dig two meters, the direct installation of pipe joints. After the initial inspection to meet the quality requirements, indicating top construction method is basically successful. First, the construction design instructions 1, pipe jacking equipment 1 cutting edge is the use of 6 mm thick steel plate made of a diameter of 940 mm cylinder, welding ∠ 9 × 90 × 8 × 100 angle 6, installed in the The front of a tube. The main function is to reduce the resistance of the jacking and the improper digging in the cutting edge when the jacking is not caused by the excavation error. Remove the cutting edge after the top can be reused. 2. jack is the top of the power plant. This Han uses a 50 tons hydraulic jack. However, in order to prevent accidents, one should be prepared to ensure smooth construction. The axis of the jack should be parallel to the axis of the culvert tube, and the point of effort should lie in the vertical plane of the tube axis. In the case of two jacks, their joint position should be about 30 cm from the bottom of the joint. The joint force point should also be in the vertical plane of the tube axis to ensure that the joint does not deviate when it is pushed in. Jack should be attached to the pressure gauge, plus observation. 3. Guide rail is used to control the pipe joints in the direction of the top and culvert