Construction organization design of a stone arch bridge project?

What is the specific content of the construction organization design of a stone arch bridge project? The following Zhong Da Consultation will answer your questions.

I. Overview of Bridge Types

The total length of the bridge is 74, and the superstructure is an orthogonal open-web arch bridge with a span of 1. The main arch ring is an articulated catenary arch with equal section, with an arch axis coefficient of 2.865,438+04, a clear span of 50m and a span-loss ratio of 65,438+0/5. The abdominal donor ring is an arc arch with equal section, with a clear span of 4.0m and a span loss ratio of 1/5. The substructure is a gravity U-shaped abutment, which expands the foundation.

The longitudinal slope of the bridge deck is 0% and the transverse slope is 1.5%.

1 main technical indicators

(1) Load grade: Class II highway, with crowd load of 3.0KN/㎡.

(2) Bridge deck width: clear width 4.5+2×1.0m. ..

(3) Longitudinal slope of bridge deck: 0%.

(4) Navigation requirements: None.

(5) Earthquake intensity: the basic intensity is lower than 6 degrees.

2. Pier and abutment

Considering the water flow and a small amount of floating objects, the pier is designed as a stone variable cross-section round end, and the abutment is a stone gravity abutment.

3. Foundation

The foundation is rubble concrete masonry foundation 15, and the pier foundation is placed in slightly weathered silty mudstone or moderately weathered sandstone layer, and its bearing capacity is not less than 0.4MPa. The abutment bedrock surface should be cleared and roughly leveled, and the rubble concrete foundation is in close contact with the bedrock surface, and the depth of the foundation embedded in the rock surface (excluding fully weathered layer) is not less than1.5.

4. Bridge deck

The deck system is paved with 22cm thick C30 concrete, precast concrete sidewalk, fine stone or imitation white marble (or marble) railing.

5. Ancillary facilities

A. Tapered slope: No.5 mortar rubble is used for slope protection, with a thickness of 30cm.

B. Filling in arch: Gravel cushion should be adopted to consider water seepage.

C waterproof layer: in order to prevent water from eroding the arch ring, it is necessary to set a waterproof layer on the arch back of the arch ring, which is made of cement separated from the water layer, and set drainage holes on the wall.

D. Deformation joint: Considering the influence of temperature on bridge span, except abutment, two expansion joints are set for each span. The expansion joint is filled with asphalt linen, and the deformation joint is 2 cm wide. ...

E. railing: fine stone or imitation white marble (or marble) railing.

F. Sidewalk: The sidewalk is made of precast sidewalk component concrete. After direct installation, apply 2cm thick cement mortar, and the sidewalk slab at the deformation joint is cast-in-place concrete.

Two. Hydrology and engineering geology of bridge site

The hydrological situation of the bridge site is simple, and the surface water is mainly replenished by atmospheric rainfall. Yazichong is a nearly north-south gully, and now it is a main gully. After the reservoir area is filled with water, the water level can rise to 175 meters at the highest.

The landform and geological structure of the bridge site area are simple, and the bedrock is medium-coarse flash cloud plagiogranite, which is directly exposed on the surface. According to the drilling exposure, the rock mass can be divided into three weathering layers from the surface down: completely weathered, strongly weathered and moderately weathered.

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