A support structure for a temporary bridge, the support structure comprising: an elongate hollow cylinder having a flat top plate secured thereto in a horizontal plane; said elongate hollow cylinder having a flat bottom plate secured thereto in a horizontal plane in diametrically opposed relation to the flat top plate, and the width of each flat plate may exceed but is substantially equal to the diameter of the hollow cylinder to which it is secured and the length of each flat plate is substantially equal to the length of its hollow cylinder; said top flat plate making tangential contact with said elongate hollow cylinder at the twelve o'clock position of a circle defined by said elongate hollow cylinder in end view; said bottom flat plate making tangential contact with said elongate hollow cylinder at the six o'clock position of said circle; a pair of upper strengthening members secured to said flat top plate and said hollow cylinder, each upper strengthening member being generally "L"-shaped and being formed by legs that are disposed in angular relation to one another; a pair of lower strengthening members secured to said flat bottom plate and said hollow cylinder, each lower strengthening member being generally "L"-shaped and being formed by legs that are disposed in angular relation to one another; said upper strengthening members positioned on opposite sides of said twelve o'clock point of tangential contact in equidistantly spaced relation to said point of tangential contact; and said lower strengthening members positioned on opposite sides of said six o'clock point of tangential contact in equidistantly spaced relation to said six o'clock point of tangential contact, and said strengthening members (14a, 14b) being in parallel relation to the longitudinal axis of symmetry and having an extent substantially equal to the elongate extent of the elongate hollow cylinder. an elongate hollow cylinder having a flat top plate secured thereto in a horizontal plane; said elongate hollow cylinder having a flat bottom plate secured thereto in a horizontal plane in diametrically opposed relation to the flat top plate, and the width of each flat plate may exceed but is substantially equal to the diameter of the hollow cylinder to which it is secured and the length of each flat plate is substantially equal to the length of its hollow cylinder; said top flat plate making tangential contact with said elongate hollow cylinder at the twelve o'clock position of a circle defined by said elongate hollow cylinder in end view; said bottom flat plate making tangential contact with said elongate hollow cylinder at the six o'clock position of said circle; a pair of upper strengthening members secured to said flat top plate and said hollow cylinder, each upper strengthening member being generally "L"-shaped and being formed by legs that are disposed in angular relation to one another; a pair of lower strengthening members secured to said flat bottom plate and said hollow cylinder, each lower strengthening member being generally "L"-shaped and being formed by legs that are disposed in angular relation to one another; said upper strengthening members positioned on opposite sides of said twelve o'clock point of tangential contact in equidistantly spaced relation to said point of tangential contact; and said lower strengthening members positioned on opposite sides of said six o'clock point of tangential contact in equidistantly spaced relation to said six o'clock point of tangential contact, and said strengthening members (14a, 14b) being in parallel relation to the longitudinal axis of symmetry and having an extent substantially equal to the elongate extent of the elongate hollow cylinder.