Post-Installed Sleeve Device For Compensating Loss Of Shear Capacity

Abstract

A post-installed sleeve device is provided for compensating loss of shear capacity of a concrete slab due to a hole drilled in the concrete slab. The sleeve device includes a hollow member of, for example, a cylindrical shape, and a lower sandwich member and an upper sandwich member shaped, for example, as ring members. The hollow member is inserted into the drilled hole such that an upper section of the hollow member extends above a top surface of the concrete slab. The lower sandwich member includes an inner edge rigidly attached to a bottom edge of the hollow member. The upper sandwich member includes an inner edge engageably connected to the upper section of the hollow member. The upper sandwich member and the lower sandwich member sandwich the concrete slab surrounding the drilled hole therebetween for compensating the lost shear capacity of the concrete slab due to the drilled hole.

I claim: 
     
         1 . A sleeve device for compensating loss of shear capacity of a concrete slab due to a hole drilled in said concrete slab, said sleeve device comprising:
 a hollow member inserted into said drilled hole, said hollow member comprising an upper section extending above a top surface of said concrete slab;   a lower sandwich member comprising an inner edge rigidly attached to a bottom edge of said hollow member; and   an upper sandwich member comprising an inner edge engageably connected to said upper section of said hollow member, wherein said upper sandwich member and said lower sandwich member are configured to sandwich said concrete slab surrounding said drilled hole therebetween for compensating said loss of said shear capacity of said concrete slab due to said drilled hole.   
     
     
         2 . The sleeve device of  claim 1 , wherein said upper sandwich member and said lower sandwich member are configured to increase area of a shear critical section around said drilled hole in said concrete slab for compensating said loss of said shear capacity of said concrete slab due to said drilled hole. 
     
     
         3 . The sleeve device of  claim 1 , wherein said hollow member is of a generally cylindrical shape. 
     
     
         4 . The sleeve device of  claim 1 , wherein a cross section of said hollow member is of a geometric shape comprising a circular shape. 
     
     
         5 . The sleeve device of  claim 1 , wherein one or more of said lower sandwich member and said upper sandwich member are ring members affixed to said hollow member, wherein said ring members are configured to transfer shear stresses through said hollow member to compensate said loss of said shear capacity of said concrete slab due to said drilled hole. 
     
     
         6 . The sleeve device of  claim 1 , wherein said hollow member is configured as an extensible hollow member to be inserted into said drilled hole of a plurality of dimensions and to enable said upper sandwich member and said lower sandwich member to adjustably sandwich said concrete slab surrounding said drilled hole of said dimensions. 
     
     
         7 . The sleeve device of  claim 1 , further comprising a plurality of gripping members positioned on and attached to an upper surface of said upper sandwich member, wherein said gripping members are configured to provide a grip for engageably connecting said upper sandwich member to said hollow member. 
     
     
         8 . A sleeve device for compensating loss of shear capacity of a concrete slab due to a hole drilled in said concrete slab, said sleeve device comprising:
 a hollow member inserted into said drilled hole, said hollow member comprising a threaded upper section extending above a top surface of said concrete slab;   a lower ring member comprising an inner edge rigidly attached to a bottom edge of said hollow member; and   an upper ring member comprising an inner threaded edge engageably connected to said threaded upper section of said hollow member, wherein said upper ring member and said lower ring member are configured to sandwich said concrete slab surrounding said drilled hole therebetween for compensating said loss of said shear capacity of said concrete slab due to said drilled hole.   
     
     
         9 . The sleeve device of  claim 8 , wherein said upper ring member and said lower ring member are configured to increase area of a shear critical section around said drilled hole in said concrete slab for compensating said loss of said shear capacity of said concrete slab due to said drilled hole. 
     
     
         10 . The sleeve device of  claim 8 , wherein said hollow member is of a generally cylindrical shape. 
     
     
         11 . The sleeve device of  claim 8 , wherein a cross section of said hollow member is of a geometric shape comprising a circular shape. 
     
     
         12 . The sleeve device of  claim 8 , wherein said hollow member is configured as an extensible hollow member to be inserted into said drilled hole of a plurality of dimensions and to enable said upper ring member and said lower ring member to adjustably sandwich said concrete slab surrounding said drilled hole of said dimensions. 
     
     
         13 . The sleeve device of  claim 8 , further comprising a plurality of gripping members positioned on and attached to an upper surface of said upper ring member, wherein said gripping members are configured to provide a grip for engageably connecting said upper ring member to said hollow member. 
     
     
         14 . A method for compensating loss of shear capacity of a concrete slab due to a hole drilled in said concrete slab, said method comprising:
 providing a sleeve device comprising:
 a hollow member comprising an upper section; 
 a lower sandwich member comprising an inner edge rigidly attached to a bottom edge of said hollow member; and 
 an upper sandwich member comprising an inner edge engageably connectable to said upper section of said hollow member; 
   inserting said hollow member of said sleeve device into said drilled hole of said concrete slab to rigidly contact an upper surface of said lower sandwich member of said sleeve device with a lower surface of said concrete slab, wherein said upper section of said inserted hollow member extends above a top surface of said concrete slab;   engageably connecting said inner edge of said upper sandwich member of said sleeve device to said upper section of said inserted hollow member; and   sandwiching said concrete slab surrounding said drilled hole by said upper sandwich member and said lower sandwich member of said sleeve device for compensating said loss of said shear capacity of said concrete slab due to said drilled hole.   
     
     
         15 . The method of  claim 14 , wherein said sandwiching of said concrete slab surrounding said drilled hole by said upper sandwich member and said lower sandwich member of said sleeve device comprises:
 transferring a first shear stress through said concrete slab, thereby producing a first compressive force on an upper surface of said lower sandwich member;   converting said first compressive force to a second shear stress from said lower sandwich member to said upper sandwich member through a wall of said hollow member;   converting said second shear stress to a second compressive force from a lower surface of said upper sandwich member, said second compressive force being transferred to said top surface of said concrete slab; and   converting said second compressive force to a third shear stress, said third shear stress being transferred to a supporting column.   
     
     
         16 . The method of  claim 14 , wherein said upper sandwich member and said lower sandwich member of said sleeve device are configured to increase area of a shear critical section around said drilled hole in said concrete slab for compensating said loss of said shear capacity of said concrete slab due to said drilled hole. 
     
     
         17 . The method of  claim 14 , wherein said hollow member of said sleeve device is of a generally cylindrical shape, and wherein a cross section of said hollow member of said sleeve device is of a geometric shape comprising a circular shape. 
     
     
         18 . The method of  claim 14 , wherein said hollow member of said sleeve device is configured as an extensible hollow member to be inserted into said drilled hole of a plurality of dimensions and to enable said lower sandwich member and said upper sandwich member to adjustably sandwich said concrete slab surrounding said drilled hole of said dimensions. 
     
     
         19 . The method of  claim 14 , wherein one or more of said lower sandwich member and said upper sandwich member of said sleeve device are configured as ring members affixed to said hollow member to transfer shear stresses through said hollow member to compensate said loss of said shear capacity of said concrete slab due to said drilled hole. 
     
     
         20 . The method of  claim 14 , further comprising providing a grip for engageably connecting said upper sandwich member of said sleeve device to said hollow member of said sleeve device by a plurality of gripping members positioned on and attached to an upper surface of said upper sandwich member.