Method for constructing scour protection of bridge and stabilization of stream bed using block mat

Abstract

The method for constructing scour protection of bridge and stabilization of stream bed using block mat according to the present invention by constructing a number of block mat structure consisting of unit blocks interlocked together, and paving said block mat structures in monolayer or multilayer on a stream bed around the foundation part of an underwater structure. By the present invention, it is possible to improve a resistance to a descending stream at upper and lower region of a pier, to prevent the ground of a stream bed from being locally scoured by the stream due to the flexibility of the block mat, and to stabilize the ground of stream bed since the spaces between the unit blocks are filled with gravels and sand after several repetitions of a flood stream and a normal stream and then the mat becomes firm.

1 . A method for constructing a scour protector and for stabilizing the stream bed, the method comprising: 
 linking a plurality of unit blocks, each of which is about rectangular in its plan view and has a body, protrusion parts and concave groove parts adjacent to said protrusion part formed on the upper and lower faces of the body, a through-hole having a predetermined size formed in the center of the body, and an interlocking member for coupling each said unit block with adjacent unit blocks provided on each of the front, rear, left and right side faces of its body, in a two-dimensional direction by said interlocking members to form block mats having a predetermined size; and    paving said block mats on the stream bed in the vicinity of the foundation of a submerged structure.    
     
     
         2 . The method according to  claim 1 , further comprising: 
 before paving the block mats, paving a base mat made of an engineering fiber to avoid a local sinking of the soft ground owing to the weight of the block mat itself.    
     
     
         3 . The method according to  claim 1 , wherein the block mats are paved in a multilayer, and the protrusion parts and the concave groove parts of the unit block are matched with the protrusion parts and the concave groove parts of the unit blocks positioned above and below.  
     
     
         4 . A method for stabilizing a stream bed and protecting a structure positioned in the stream bed, comprising: 
 forming a block mat by linking a plurality of blocks to each other, each said block having a body, protrusions and grooves adjacent to said protrusions on an front face and a rear face of said body, a through-hole in the center of said body, and an interlocking member for coupling said blocks to each other in order to form the block mat; and    laying said block mat on the stream bed.    
     
     
         5 . The method of  claim 4 , further comprising: 
 before laying said block mat, paving a base mat made of an engineering fiber to avoid a local sinking.    
     
     
         6 . The method according to  claim 4 , wherein the block mats are paved in a multilayer, and the protrusions and the grooves formed on each block are matched with the protrusions and the grooves formed on the blocks positioned above and below.  
     
     
         7 . The method according to  claim 4 , wherein the structure is a foundation of a bridge pier.  
     
     
         8 . The method according to  claim 4 , wherein the structure is an abutment.  
     
     
         9 . The method according to  claim 4 , wherein the stream bed to be stabilized is in the fire prevention dam.  
     
     
         10 . The method according to  claim 4 , wherein the structure is a breakwater.  
     
     
         11 . The method according to  claim 4 , wherein the structure is a foot.  
     
     
         12 . The method according to  claim 4 , wherein the structure is a pipeline.  
     
     
         13 . The method according to  claim 4 , wherein the structure is a bank.  
     
     
         14 . The method according to  claim 4 , wherein said interlocking member comprises an iron loop and a U bolt interlocking said iron loop and the iron loop of the adjacent block.  
     
     
         15 . The method according to  claim 4 , wherein a plurality of block mats are formed and positioned adjacently to each other, and the plurality of block mats are not interlocked to each other.