JPS61124790U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is a side view of a bent hose for absorbing pulsating pressure attached to the tip of a transport pipe at a high place, and Figure 2 is a part of the bent hose for absorbing pulsating pressure showing an example of implementation of this invention. Plan view showing cross-sectional structure, 3rd
The figure is an enlarged plan view showing the details of the bend forming area in Figure 2 with a partial cross section. Figure 4 is a diagram of the pulsation state of fresh concrete on the injection inlet side and the discharge side. The solid line is the PI fluctuation on the injection inlet side. The curve, the dotted line is the discharge side DS fluctuation curve, the vertical axis is the fluctuating pressure P, the horizontal axis is the elapsed time t (sec.),
Figure 5 is a relationship curve diagram between the pressure on the injection inlet side and the discharge side and the hose internal volume increase rate, the solid line is the PI curve on the injection inlet side, the dotted line is the DS curve on the discharge side, the vertical axis is the pressure P, and the horizontal axis is the hose The internal volume increase rate is V%. BH...Bending hose for absorbing pulsating pressure, BS...Bending forming area, CSS... Pulsating pressure absorbing area, 3...Inner surface rubber, 4...Lower wire rod holding cord layer, 5...Intermediate rubber,
6...Spiral reinforcing wire rod, 7...Upper wire rod clamping cord layer, 8...Full-length reinforcing cord layer at bent portion, 9-13...
Gradually decreasing reinforcing cord layer, 15...outer rubber.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hose for force-feeding and pouring ready-mixed concrete, in which a bend forming area at a bent portion and a pulsating pressure absorbing area for pouring are formed into one long hose,
As reinforcement across both of the above areas, on the inner rubber,
A wire clamping cord layer made of an organic fiber cord is provided that clamps the lower and upper parts of the helical reinforcing wire embedded with intermediate rubber. is expanded in several stages or sequentially, and within the pulsating pressure absorption area of the fresh concrete, the expansion pitch is set in a spiral shape with equal intervals, and the cord angle of the wire rod holding cord layer common to both areas is 66° to 80°. From the range of high angles of °, select the required angle that is common to both the above areas,
The cord directions of the lower and upper wire rod holding cord layers are set to be 1 ply each in opposite directions, or a ply in which auxiliary cords with a density coarser than this ply are added in a cross pattern, and in the bending area, the upper wire rod holding cord layer is Then, a full-length reinforcing cord layer is set in the opposite cord direction with a cord angle smaller than that of the cord layer, and the length and cord angle of the reinforcing cord layer are sequentially changed from this reinforcing cord layer to the upper layer. A bending hose for absorbing pulsating pressure in which a gradually decreasing reinforcing cord layer that gradually decreases at the same angle is set in the required plies with the cord direction opposite to each other, and both areas are covered with an outer rubber layer. (2) The cord angle of the full-length reinforcing cord layer and gradually decreasing reinforcing cord layer is limited to the bending area from 65°.
The bent hose for absorbing pulsating pressure according to claim 1, wherein the cord angle is smaller than the cord angle of the wire clamping cord layer within the range of 20 degrees, and the cord angle gradually decreases toward the upper layer.