Assembled mud-rock flow debris dam and construction method thereof

Abstract

A rapidly assembled debris flow sediment storage dam and a construction method are provided. The sediment storage dam has a main dam body with multiple prefabricated reinforced concrete rectangular boxes linked by vertical and horizontal connections. The top surface of each rectangular box is open, and the other five surfaces of the rectangular box are closed. Soil is used to fill each rectangular box. The main dam body is assembled above dam body foundations. Dam abutment foundations of the sediment storage dam and the inside slope of the dam body are filled with cement-laid stone masonry or concrete, while the top surface of the dam crest is also sealed using cement-laid stone masonry or concrete.

1 - 10 . (canceled) 
     
     
         11 . A rapidly assembled debris flow sediment storage dam, comprising:
 at least one dam body foundation;   a main dam body provided on the dam body foundation, the main dam body comprising a plurality of prefabricated reinforced concrete rectangular boxes, the boxes being linked by vertical and horizontal connections, wherein the top surface of each box is open and the other five surfaces of each box are closed;   soil for filling each box;   at least one dam abutment foundation, wherein the at least one dam abutment foundation and an inside slope of the main dam body are filled with at least one of cement-laid stone masonry and concrete; and   a dam crest, the top surface of which is sealed using at least one of cement-laid stone masonry and concrete.   
     
     
         12 . The assembled debris flow sediment storage dam according to  claim 11 , wherein:
 the net dam height between a overflow portion of the main dam body and the at least one dam body foundation is an integral multiple of the height h of each box;   the width of the dam crest is an integral multiple of the length of the short edge of each box, or the gradient 1:m of the inside slope of the main dam body is twice the ratio of the height of each box relative to the length of the short edge of each box; and   the length of the long edge of each box is equal to the length of the short edge of each box , or twice the length of the short edge of the each box, or three times the length of the short edge of each box.   
     
     
         13 . The assembled debris-flow sediment storage dam according to  claim 12 , wherein the net dam height between the overflow portion of the main dam body and the dam body foundation is less than or equal to 10.0 m, the height of the rectangular box is in the range of 0.5-1.0 m, and the weight of each box is less than or equal to 2000 kg. 
     
     
         14 . The assembled debris flow sediment storage dam according to  claim 12 , wherein: if the length of the long edge of each box is twice the length of the short edge of each box, a transverse partition is added parallel to the short edge in each box; if the length of the long edge of each box is three times the length of the short edge of each box, two transverse partitions are added parallel to the short edge of each box. 
     
     
         15 . The assembled debris flow sediment storage dam according to  claim 14 , wherein the thickness of the side wall of each box is 0.08-0.12 m, and the thickness of the baseplate of each box and each transverse partition is 0.06 m. 
     
     
         16 . The assembled debris flow sediment storage dam according to  claim 14 , wherein the side wall of each box comprises a single-sided reinforcement or a double-sided reinforcement, the baseplate of each box and the transverse partitions comprise a single-sided reinforcement, the overall reinforcement ratio per unit volume is 0.5-2.0%, and the single-sided reinforcement or the double-sided reinforcement comprises a plurality of steel bars each having a diameter of 0.006-0.012 m. 
     
     
         17 . The assembled debris flow sediment storage dam according to  claim 11 , wherein the side wall of each box have horizontal connecting holes to facilitate the transverse connection of the box, the baseplate and the side wall of each box have drainage holes, and the four corners of the baseplate of each box have a vertical connecting hole to facilitate the longitudinal connection of the box. 
     
     
         18 . The assembled debris flow sediment storage dam according to  claim 17 , wherein the numbers of horizontal connecting holes and drainage holes on the side wall of the short edge of each box are in the range of 2-4, the numbers of horizontal connecting holes and drainage holes on the side wall of the long edge of each box are in the range of 2-12, the diameter of each horizontal connecting hole is in the range of 0.02-0.03 m, and the diameter of each drainage hole is in the range of 0.03-0.06 m, and the size of each vertical connecting hole is 0.03×0.03-0.04×0.04 m 2 . 
     
     
         19 . The assembled debris flow sediment storage dam according to  claim 12 , wherein the maximum grain size of the soil used to fill each box is half the length of the short edge of each box. 
     
     
         20 . A method for constructing an assembled debris flow sediment storage dam, the method comprising:
 determining the size of the sediment storage dam based on the environment; determining the geometric proportions of each of a plurality of prefabricated rectangular boxes based on the size of the sediment storage dam; and determining the space-filling position of each box in the sediment storage dam based on a façade,   excavating foundations of the sediment storage dam based on a predetermined excavation line for the foundations; treating the base of the foundations with reinforced concrete, or concrete and cement-laid stone masonry, to produce a dam body foundation; and simultaneously preparing the boxes at sites away from the sediment storage dam,   hoisting the boxes layer upon layer from the bottom to the top, starting at the dam body foundation; implementing vertical and horizontal connections between the boxes; after the boxes have been hoisted layer upon layer, filling the boxes with soil excavated during the excavation of the foundations; tamping and intensely vibrating the soil to form a dam body,   filling dam abutment foundations of the sediment storage dam with cement-laid stone masonry or concrete; and filling the inside slope of the dam body with cement-laid stone masonry or concrete to form a predetermined dam body pattern, and   sealing the top surface of a dam crest using cement-laid stone masonry or concrete to complete the rapidly assembled debris flow sediment storage dam.