Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
  • E01D19/00—Structural or constructional details of bridges
  • E01D19/02—Piers; Abutments ; Protecting same against drifting ice
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
  • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
  • E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
  • E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
  • E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02B—HYDRAULIC ENGINEERING
  • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
  • E02B17/0017—Means for protecting offshore constructions

Definitions

• the present invention relates to a method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed in a river or a stream, particularly to a method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed in a river or a stream by using block mats, in which said block mats are paved on stream bed in the vicinity of the foundation of a submerged structure to prevent the vicinity of submerged bridge piers and abutments from scouring by the flow of water and to stabilize the foundation of the bridge piers.
• scouring continuously happens in the vicinity of the foundation of submerged structures such as a bridge, a breakwater or a protecting bank built in a riverside or seaside. Such scouring may cause an evacuation of the sand and gravels at the base of the foundations of the submerged structures to give detrimental effects on the stability of said structures.
• protecting blocks having a weight of about 5 ton or more are thrown at a seaside or breakwater, in which the velocity of flow and waves are high, to protect the 01 01823
• the present invention is envisaged to solve the above problems.
• the object of the present invention is to provide a method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed in a river or stream, by paving block mats on the stream bed in the vicinity of submerged bridge piers and abutments to prevent the vicinity of submerged bridge piers and abutments from scouring by the water flow and to stabilize the ground in the vicinity of the foundations of the bridge piers.
• the method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed by using block mats is characterized by that it comprises: linking a large number of unit block, which is nearly rectangular in its plan view and has protrusion parts and concave groove parts adjacent to said protrusion part formed on the upper and lower faces of its body, a through-hole having a predetermined size formed in the center of its body, and interlocking members for coupling with an adjacent unit block provided on the front, rear, left and right side faces of its body, in a two-dimensional direction by means of said interlocking members to form a large number of block mats having a predetermined size; and paving said block mats on stream bed in the vicinity of the foundation of a submerged structure.
• the present invention it is preferable to previously pave base mat made of an engineering fiber on the overall construction area of the stream bed to avoid a local sinking of the soft ground owing to the weight of the block mat itself before the block mats are paved.
• Figure 1 is an apparent perspective view of a unit block which is employed in the method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed according to the present invention.
• Figure 2 represents a block mat in which a large number of unit block represented in Figure 1 are linked.
• Figure 3 represents a construction shape in which several block mats represented in
• Figure 2 are paved on stream bed in the vicinity of the foundation of a bridge pier and/or abutment.
• Figure 4 represents a change of stream bed in the vicinity of the foundation of a bridge pier and/or abutment when the flow amount is increased (at a flood state) after block mats are paved as represented in Figure 3.
• Figure 5 shows a change of stream bed in the vicinity of the foundation of a bridge pier when the flow amount is decreasingly recovered to the original state (at a normal state) after the flood state of Figure 4 has passed.
• Figure 6 is a front view of a debris barrier constructed by applying the method of the present invention.
• Figure 7 is a sectional view of a fire prevention dam constructed by applying the method of the present invention.
• Figure 1 is an apparent perspective view of a unit block which is employed in the method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed according to the present invention.
• the block (100) used in the method of the present invention is nearly rectangular in its plan view, and the upper and lower faces of its body are provided with protrusion parts (101) and concave groove parts (102) adjacent to said protrusion part, by which the block is somewhat stuck into the ground of stream bed to resist the water flow and maintain the paving state as well as a unit block is matched with the upper and lower blocks so that the overall integrated structure of blocks becomes firm.
• an interlocking member (104) for coupling with the adjacent unit block is provided at each side face of the front, rear, left and right of the body.
• Said interlocking member (104) can be made of deformed bar. When the block is used in see water (salty water), the deformed bar can be covered with a stainless steel or the interlocking member itself can be made of a stainless steel.
• FIG. 1 represents an interlocking mode in which 9 unit blocks (100) are interlocked together.
• the number of unit blocks (100) to be interlocked can be changed and thus 12, 15, 16 or more unit blocks can be linked together to form a block mat structure (200), depending on the construction working plan considering the flow velocity or scour status at the construction area.
• prepared block mats (200) are paved in a single layer or multilayer on the stream bed in the vicinity of the foundation of a submerged structure (300) (for example, bridge pier and/or abutment).
• a block mat structure (200) having a weight of several tens tons is lifted by a specially designed crane having a lifting frame apparatus and then positioned under water.
• Said lifting frame apparatus and a method of constructing concrete block using the same are specifically described in USP 6,293,730.
• Block mat structures (200) are positioned adjacently together (for example, with a distance between block mats of 30 cm ⁇ 10 cm), but they are not interlocked together.
• Figure 4 shows a change of a stream bed in the vicinity of the foundation of a bridge pier when the flow amount is increased (at a flood state) after block mats are paved as represented in Figure 3.
• FIG 4 when the flow amount and velocity of a river or a stream are increased at a flood state, local scours then happen at the front end of the upstream flow and at the rear end of the downstream flow.
• unit blocks (100) are . interlocked together by iron loops (104) to form a block mat structure (200), which is flexible due to their weight.
• unit blocks (100) bend down along to the inclined surface of a local scour hole generated. As such, an enlargement or spread of the local scour into the inside of the foundation of a bridge pier is avoided.
• Figure 5 shows a change of a stream bed in the vicinity of the foundation of a bridge pier when the flow amount is decreasingly recovered to the original state (at a normal state) after a flood state of Figure 4 has passed.
• a reduction of the flow amount and velocity is accompanied with a deposition of sand and gravels into local scour holes which have been generated at said front end and said rear end, and an insertion thereof into the space between the unit blocks of said block mats (200). Said deposition and insertion will make the ground of the stream bed firm and solid.
• the ground of the stream bed is further stabilized against scour and any local scour can be avoided.
• the coefficient of roughness of stones or a mesh bag of stones is 0.033-0.036 and that of the block of the present invention is 0.018-0.031. Therefore, it is concluded that the drainage of the block of the present invention is much more stable than that of the mesh bag of stones.
• the tolerated shear stress for the block is calculated to about 10 times more than that of stones having a diameter of 10 ⁇ 30 cm. Therefore, it is confirmed that the flow resistance for the block is more stable than that for the stones.
• the blocks may be used as a "wear".
• a "wear" for a concrete-integrated structure can be effectively used in the measurement of the flow amount.
• Figures 6 and 7 show a debris barrier and a fire prevention dam, respectively, which are constructed according to the method of the present invention.
• Figure 6 is a front view of a debris barrier and
• Figure 7 is a sectional view of a fire prevention dam.
• the block mats (200) are basically on the ground of stream bed, as in the construction for the stabilizing stream bed in the vicinity of bridge. Further, since they should have a function to reserve water as a dam, the block mats (200) having various size are prepared and then laminated in a multilayer. When the block mats (200) are laminated in a multilayer, an upper unit block and a lower unit block are positioned so that their protrusion part (101) and the concave groove part (102) formed on each unit block are matched together.
• the reference number 600 described in Figures 6 and 7 represents a mat for restoring water.
• the method for the construction of an anti-scour protection of a bridge and for the stabilization of stream bed in a river or a stream which uses block mats according to the present invention can improve a resistance to a descending stream at an upstream region of a pier and to a turbulent stream at a downstream region of a pier, prevent the ground of stream bed from being locally scoured by the stream because of the flexibility of the block mat due to the weight of each of the unit blocks interlocked with each other by means of U-type bolts, and to stabilize the ground of stream bed, and stabilize the ground of stream bed, since gravels and sand fill the spaces between the unit blocks to make them firm after several repetitions of a flood state and a normal state.
• the present invention can also be applied to a constructions for preventing of scour and erosion, a construction for resisting of dropping water, a breakwater, etc. in a river, a seaside and a port, and various other fields including an erosion control work. etc.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Revetment (AREA)
• Bridges Or Land Bridges (AREA)

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Publications (1)

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• 2001
  • 2001-10-26 WO PCT/KR2001/001823 patent/WO2003035986A1/en not_active Application Discontinuation
  • 2001-10-26 US US10/493,100 patent/US20040265060A1/en not_active Abandoned
  • 2001-10-26 CN CNA018237398A patent/CN1558975A/zh active Pending
  • 2001-10-26 JP JP2003538474A patent/JP2005508464A/ja active Pending
  • 2001-10-26 EP EP01981136A patent/EP1440208A1/en not_active Withdrawn

Non-Patent Citations (1)

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