Crawler Hydraulic inverting bridge formwork

Inverted arch construction is a key process of construction efficiency and quality control. In order to reduce the interference of the inverting arch construction on the vehicle transportation in the tunnel, the new hydraulic crawler hydraulic inverting bridge formwork is adopted. The trestle is compact and realized. Quickly moving in place, reducing labor intensity, ensuring construction safety and improving construction efficiency.

1. technical parameters

  1. Open weight limit: <60T (excluding self weight)
  2. Opening limit <3.4m
  3. Effective span of 17m
  4. Safe step: V-class surrounding rock, from the face of the face, 35m of the inverting arch, 70m of the second lining
  5. Working mode: hydraulic
  6. Walking method: crawler self-propelled

2. the main parameters of the product

Appearance size (m): 30 (length) × 3.6 (width)

Product weight: about 52t

Maximum walking speed: 25 m/min

Approach bridge slope: ≤12°

Driving force: 120 KN

Total power: 18.5 Kw

Walking state grounding specific pressure: ≤ 0.1 MPa

Open state grounding specific pressure: ≤ 1 Mpa

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Crawler Hydraulic inverting bridge formwork Structural calculation

(force analysis)
The trestle structure consists of two I25b I-beams arranged side by side as longitudinal members. The upper and lower flange plates of each of the two I-beams are welded long, and the horizontal top is connected with Φ22 threaded steel bars to ensure that the longitudinal beams can be combined under the load of the wheels. Forced and able to increase the lateral stiffness of the trestle deck.

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1. Mechanics simplification

Both ends of the beam have the possibility of rotation and expansion, so the calculation diagram can be simply supported. Since the bending moment on the section changes with the position of the load, the maximum normal stress on the dangerous section, ie the maximum bending moment section, should not exceed the bending allowable stress of the material [σ] when calculating the structural strength. Therefore, it is necessary to determine the most unfavorable position of the load. When comparing the bending moments at different positions of the load, the P/3 load should be taken at the mid-span position when the maximum normal stress is checked. When calculating the maximum shear stress, take the load close to the bearing position.

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