JPS5996331A - Construction work of upside of mound - Google Patents

Abstract

PURPOSE:To construct a mound with a flattened horizontal upside by a method in which a concrete feeding pipe is fixed with a steel frame and a steel flat plate, and the bag of the formwork is closely fixed to a rubber plate attached to the steel flat plate in such a way as to form the shape of the upside of a rubble-mound. CONSTITUTION:A concrete feeding pipe 2 is fixed with a steel frame 3 and a steel flat plate 4, the frame 3 and the flat plate 4 are connected with a rope 1, and the bag 6 of a formwork is fixed to a rubber plate 5. The device is supported in water, concrete 9 is poured through the pipe 2, the bag 6 of the formwork is settled to a given depth by the rope 1, and then concrete 9 is poured through the pipe 2. The bag 6 of the formwark is deformed to the shape of the upside of a rubble-mound 7 and filled with concrete 9. After the concrete 9 hardens, the plate 5 is separated from the flat plate 4 to obtain a mound with a flattened horizontal upside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for making the upper surface of a rubble mound horizontal, flat, and strong with concrete when building a mound in deep water where it is difficult to level the mound by hand.

Conventionally, when constructing a composite breakwater, the top surface of the rubble mound is leveled manually, but as the water gets deeper and the top surface of the rubble mound becomes deeper, it becomes difficult to level the surface manually, so leveling is often not done. Therefore, it was necessary to consider the effect that the uneven top surface of the rubble mound would have on the caisson bottom slab.

This invention will be explained based on the drawings. In FIG. 1, a concrete pressure pipe 2 is fixed with a steel frame 3 and a steel flat plate 4. The steel frame 3 and the steel flat plate 4 are connected by a rope 1. The bag 6 of the formwork is fixed to a board 5 made of rubber or asphalt, as shown in FIG. The upper surface of the rubber or asphalt plate has a band-shaped protrusion 8, and the steel flat plate 4
This protrusion 8 is a device for preventing separation from the steel flat plate 4 due to the pressure generated by concrete pouring. After the poured concrete has solidified, the flat plate 5 made of rubber or asphalt is removed from the flat steel plate 4 by moving the flat steel plate 4 along the band-shaped projections 8.

First, the apparatus shown in FIG. 1 is held stationary on or under water using a rope 1, and concrete is poured through a pressure pipe 2. Thereafter, the bag 6 of the formwork is sunk to a predetermined depth using the rope 1 and kept stationary until the concrete hardens. Alternatively, after the apparatus shown in FIG. 1 is submerged to a predetermined depth and kept stationary, concrete is poured through the pressure pipe 2 and the concrete is solidified. The formwork bag 6 is deformed according to the shape of the upper surface of the rubble mound, and the inside thereof is filled with concrete. See Figure 3. After the concrete hardens, the rubber or asphalt plate 5 is separated from the steel flat plate 4 by moving the rope 1 along the band-shaped protrusion 8. The amount of concrete to be poured can be predicted in advance since the volume of the formwork bag 6 is known.

For the above reasons, it is possible to construct a mound of concrete blocks that closely conforms to the shape of the upper surface of the rubble mound and whose upper surface is horizontal and flat.

As explained above, this invention produces the same effect as leveling a rubble mound, and has the advantage of being able to disperse the force from the bottom of the caisson like a footing, and reducing the width of the caisson embankment.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the apparatus for carrying out the present invention, Fig. 2 is an enlarged view of the formwork attachment part, and Fig. 3 is a longitudinal sectional view when the formwork is held still at a predetermined water depth and concrete is being poured. . 1... Rope, 2... Pressure pipe, 3... Steel frame, 4... Steel flat plate,
5... Rubber or asphalt board, 6... Bag, 7... Rubble mound, 8... Band-shaped protrusion, 9... Concrete. Patent applicant Shinichiro Sekiguchi

Claims (1)

[Claims] When constructing a mound for installing a structure with a flat bottom plate, such as a caisson, a rubber or asphalt plate attached tightly to a steel plate and a The fixed bag is used as a formwork, concrete is poured into the bag on or under water, and then the bag is submerged to a predetermined depth. Alternatively, the bag can be sunk to a specified depth and then concrete can be poured. By solidifying concrete at a predetermined depth to create a concrete block, the bottom surface of the concrete block is in close contact with the top surface of the rubble mound, and the top surface of the concrete block is made of a steel flat plate to create a horizontal and flat top surface of the mound. construction method.