JP3512930B2 - Formwork for roadbed material production - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a roadbed material for road pavement and a formwork used in the method. 2. Description of the Related Art For example, in asphalt-based road pavement material, stone powder made of limestone or igneous rock has been conventionally used in order to fill voids in coarse aggregate and to improve the properties of the asphalt together with the asphalt. Mixed. However, the use of such stone powder as a roadbed material involves finely pulverizing naturally occurring rocks such as limestone, which is expensive and expensive to manufacture, and can be obtained stably as a material. There is a problem that can not be. On the other hand, in a ready-mixed concrete plant, the returned concrete, which has been returned from the concrete mixer truck as surplus together with the washing water, is conventionally led to a coarse aggregate collecting device such as a trommel or an inclined cage, and as shown in FIG. The fine aggregate is separated and recovered, and then guided to a fine aggregate recovering device such as a classifier to separate and recover fine aggregate such as sand. The settled sludge water is pumped to a filter press by a high-pressure pump to be dehydrated and treated as filter cake (hereinafter, referred to as a dewatered cake). In addition, the filtered water and supernatant water of the filter press are reused for washing water or for mixing ready-mixed concrete. [0004] However, since the dewatered cake is fine particles of cement hydrate, if it is dumped in the sea or underground as it is, there is a risk of dispersion and pollution. However, an appropriate treatment method has not been established in the past. For this reason, expensive disposal costs were required as industrial waste. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method of manufacturing a roadbed material which can be easily manufactured by using the above-mentioned returned concrete and dewatered cake as materials, and which can be manufactured at a low cost and without any risk of pollution. It is intended to provide a mold for the production. [0006] For this purpose, the present invention provides a method for
Mix and stir the water cake and return concrete in the appropriate ratio.
Into the formwork, and it becomes semi-consolidated in the formwork.
Where the semi-solidified material is removed from the formwork and further
After the semi-consolidated material is left in air and cured
In the manufacturing method of roadbed material crushed by crusher
The mold for molding a semi-consolidated material,
It is composed of a frame and a bottom plate partitioned into a child shape, and the bottom plate is
And a half of the frame above the frame.
A pusher that pushes the consolidated substance downward
And features. Next, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 shows an outline of a process of the method of manufacturing the roadbed material. In the figure, reference numeral 1 denotes a filter press for dewatering the sludge water shown in FIG.
The dewatered cake discharged into the cake storage area. After the dehydrated cake 2 is dried in the cake storage, it is conveyed to the cake storage tank 6 via the hopper 4 and the belt conveyor 5 and is stirred by the rotating blades 7 provided in the cake storage tank 6. Reference numeral 8 denotes a screw conveyor for carrying out the dewatered cake 2 from the cake storage tank 6. On the other hand, reference numeral 10 denotes a concrete mixer truck which has returned from the construction site while leaving excess fresh concrete in the drum. The mixer truck 10 discharges the returned concrete 17 to the hopper 11 at the car wash, and 17
Is temporarily stored in a collection tank 13 through a screw conveyor 12. The concrete 17 is quantitatively fed from a collection tank 13 to a stirring tank 15 by operating a tube pump 14 and stirred, and then transferred to a mixer 16 where the dewatered cake 2 is fed from the screw conveyor 8. The dehydrated cake 2 and the return concrete 17 are mixed and stirred by the mixer 16. At this time, the water content is adjusted by adjusting the mixing ratio of the dewatered cake 2 and the concrete 17, and cement is added to the mixer 16 when necessary as a binder. Then, a mixture of the dewatered cake 2 and the returned concrete 17 discharged from the mixer 16 is conveyed by a screw conveyor 20 and cast into a mold 21 through a hose 22. As shown in FIGS. 2 and 3, the formwork 21 is a frame body 25 in which a plurality of chambers 24 are partitioned in a grid by a partition plate 23.
And a bottom plate 26, and one side of the bottom plate 26 is a hinge 27.
, And can be expanded downward as shown in FIG. 4 by the expansion and contraction operation of the cylinder 28.
Reference numeral 29 denotes a drain gutter formed on the periphery of the bottom plate 26. Reference numeral 30 denotes a pusher provided above the frame 25. The pusher 30 is provided with a plurality of pressing rods 32 facing the respective chambers 24 at the end of an operating shaft of a cylinder 31. For this reason, the mixture of the dewatered cake 2 and the return concrete 17 placed in each chamber 24 of the formwork 21 is:
When left in the mold 21 overnight (several hours), the semi-consolidated state is obtained. In this semi-consolidated state, the bottom plate 26 is developed as shown in FIG. Is pressed down into each of the chambers 24 to extrude a block-shaped semi-consolidated material 33 from the mold frame 21, and the semi-consolidated material 33 is cured by being naturally left in the atmosphere to form a fixed form. Form a block. Since the semi-solidified material is released in this manner when it becomes semi-solidified, the semi-solidified material 33 does not adhere to the inner surface of the mold 21 and can be easily removed without using a release agent or the like. You can type. Further, in this case, since the semi-consolidated material 33 is taken out from the semi-consolidated state in the mold 21, there is no possibility that the blocks after demolding are combined to form a large mass. The block 40 is further crushed by a crusher 41 to an appropriate size, and is passed through a vibrating sieve 42 to be selected in size. The mold 21 can be further easily removed by forming the mold 21 in such a manner that the diameter thereof is tapered downward. As described above, since the roadbed material according to the present invention is manufactured from dewatered cake and return concrete, which are industrial wastes, the manufacturing cost can be remarkably reduced, and it can contribute to the prevention of pollution. When the mixture of the cake and the returned concrete is in a semi-solid state, it is taken out of the formwork, so that it can be easily taken out with little adhesion to the inner surface of the formwork, thereby improving productivity. In addition, the bottom plate of the mold is provided so as to be deployable downward, and the pusher is provided, so that there is an advantage that labor saving in die cutting can be achieved.

[Brief description of the drawings] FIG. 1 is a schematic view of a process of a method of manufacturing a roadbed material according to the present invention. FIG. 2 is a perspective view of a mold. FIG. 3 is a longitudinal sectional view of a mold. FIG. 4 is an operation state diagram of FIG. 3; FIG. 5 is a process chart of a conventional return concrete. [Explanation of symbols] 1 Filter press 2 Dehydrated cake 6 Cake storage tank 10 Mixer truck 13 Recovery tank 15 Stirring tank 16 mixer 17 Return concrete 21 Formwork 23 Partition plate 24 rooms 25 frame 26 bottom plate 27 Hinge 28 cylinders 30 pushers 33 semi-consolidated material 40 blocks 41 crusher 42 vibrating sieve

──────────────────────────────────────────────────続 き Continuation of front page (58) Fields investigated (Int. Cl. ⁷ , DB name) B28B 1/00 B28B 7/00 B28C 5/00-9/04 B09B 3/00

Claims (1)

(57) [Claims 1] The dewatered cake and the returned concrete are mixed and stirred at an appropriate ratio and poured into a mold, and when this is in a semi-consolidated state in the mold, The semi-consolidated material is removed from the formwork, and the semi-consolidated material is allowed to stand naturally in the air to be cured, and then crushed by a crusher .
In the production method, the mold for molding a semi-solidified material
A frame, consisting of a frame and a bottom plate partitioned in a grid.
The bottom plate is provided so as to be deployable below, and
A pusher for pushing the semi-solidified material in the frame downward.
A mold for manufacturing a roadbed material, comprising: