JPS5998925A - Leak preventer for placed concrete in preceding element in construction of underground continuous wall - Google Patents

Abstract

PURPOSE:To prevent the leakage of concrete to the following element side by a method in which a leak preventive plate composed of an elastic thin iron plate and rubber is provided to an iron bar cage in such a way as to ensure the close adherence of the iron bar cage to the wall face of a trench. CONSTITUTION:An iron bar cage B is provided with a leak preventive plate A formed by bonding an elastic thin iron plate 1 with a rubber plate 2. When the plate A is pushed and bent inwards in the direction of arrow and an iron bar cage B is inserted into a trench C, the plate A is press-contacted with the wall face of the trench C by its elasticity. Joint boxes 11 and 12 are set on the tip and both ends of the outside iron bar cage of the joint steel members 3, crushed stones 13 are packed in the spaces of the outside trench of the joint boxes 11 and 12 on both ends, and concrete is placed into the trench C.

Description

[Detailed Description of the Invention] In order to prevent the concrete poured in the groove from leaking into the adjacent trailing element (III), elasticity is applied to the steel material of the construction joint to be attached to the reinforcing bar cage built in the groove. An underground continuous wall, etc., characterized in that it is equipped with a leakage prevention plate made by combining a certain thin iron plate and a rubber plate, so that its elasticity and toughness are utilized to securely press against the ground wall surface of an excavated trench. The present invention relates to a leakage prevention device for poured concrete in a preceding element during construction.

Conventional construction methods of this type include, for example, attaching a flexible pipe to the joint steel material and pressurizing gas or liquid into the pipe to press it against the wall of the excavation trench to prevent concrete from leaking; There are methods known to prevent concrete from leaking out, such as using a steel casing with built-in plates to prevent concrete from getting around, or attaching a simple rubber plate or cloth sheet to the steel material. The method of using flexible pipes described above not only requires a device to pressurize gas or liquid into the pipes, but also has the drawback of insufficient filling treatment after concrete is placed, resulting in a disadvantage when used as a structure. It's easy to become.

In addition, the method of using a steel casing requires reinforcement to withstand the lateral pressure of concrete, and has drawbacks such as the fact that the concrete wraps around the casing, causing problems in the work of pulling out the leakage prevention plate.

In addition, when using a simple rubber plate or cloth sheet,
Due to the lack of rigidity, it becomes difficult to prevent concrete from leaking when the groove width becomes wide and the distance between the groove and the blocking plate becomes large.

The present invention relates to a device that eliminates these drawbacks and prevents poured concrete from leaking into the adjacent element 5111 in a rational and effective manner. Concrete leakage prevention@A, as shown in Figure 1, uses elastic thin iron plates (11
A rubber plate (21) is crimped or pasted onto one side of the rubber plate (21) to form a single piece, and one edge of this leakage prevention plate A is a flat steel material (31). (Mounting piece i5 provided on one edge of 4'l) is fixed with bolts etc. (71, +7') by applying t6f and 161 so that it opens outward along the diagonal surface of l1lffi. The I-shaped joint flat steel material (31) to which the leakage prevention plate A is attached in this way is constructed by inserting the second horizontal reinforcing bar (8).

When erecting the reinforcing bar B equipped with the leakage prevention plate A, which is composed of an elastic thin iron plate and a rubber plate, into an excavated trench C, it must be pushed inward as shown by the chain line in Figure 2. When inserted by bending, the leakage prevention plate A returns outward due to its elasticity and is strongly pressed against the wall surface of the ground of the groove as shown in FIG. After setting like this, joint steel material on both sides +31 (3
Install joint boxes aυ, 11'Z) at the tip and both sides of the 9111 reinforcing bar basket outside 1, and place crushed stone α3, (
As shown in FIG. 4, a concrete circle is placed in the groove C filled with 131. Next, as shown in the same figure, concrete is poured for the second preceding element by placing the concrete at a predetermined interval in the same manner as described above, and the reinforcing bar cage for the succeeding element is erected between both of them, and concrete is poured. It is similar to the conventional construction method to connect both preceding elements by installing a continuous wall to form a series of continuous walls.

As described above, according to the device of the present invention, a rubber plate is bonded to an elastic thin iron plate as a leakage prevention device to an adjacent trailing element when concrete is placed for a leading element in the construction of an underground continuous wall, etc. By using a composite board with appropriate elasticity and rigidity, it is possible to ensure sufficient adhesion to the wall of the groove, so it will not be bent by the vertical pressure of the poured concrete, and therefore its There is a unique patented effect that can reliably prevent concrete leakage without the need to spread the contact surface over a wide area.

[Brief explanation of the drawing]

@ Figure 1 is a plan view showing how the leak prevention plate is attached to the joint steel, Figure 2 is a plan view showing how it is assembled to the reinforcing bar cage, Figures 3 and 4 are plan views showing how it is set to the excavated groove, FIG. 5 is a perspective view of a part of the joint steel material equipped with a leakage prevention plate incorporated into a reinforcing bar frame. 11)...Thin Wk plate* (21...Rubber plate, (31@
``I-shaped joint flat steel material, <41, (I1... Kohan, (
51, (5'l-・Mounting piece, <61. (61... Backing plate, (71m-(7'l... Bolt, (
8I...Horizontal reinforcing bar. 191@-Longitudinal reinforcing bar, (101--Stirrup, (Iυ
, u21-Φ joint box, 03...crushed stone, a#
・Concrete 1-, A-・Leakage prevention, 41. B... Rebar cage, C... Excavation groove. Patent applicant: Maeda Construction Industry Co., Ltd.

Claims (1)

[Claims] A concrete leakage prevention barrier made by bonding and combining an elastic thin steel plate and a rubber plate was removed from both 1111R steel plates of the construction joint of the reinforcing bar cage to be erected within the pre-concrete pouring element of the trench excavated during the construction of an underground continuous wall, etc. The leakage prevention plate is fixed diagonally so that it opens, and by pushing and bending the leakage prevention plate inward and inserting it into the groove, its return elasticity causes it to come into pressure contact with the ground wall of the groove, thereby preventing leakage of poured concrete. Features: A device to prevent leakage of poured concrete in advance elements during the construction of underground continuous walls, etc.