JPH0571363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a finishing method in a production line for precast concrete plates.

(Prior art) Conventionally, in the production of this type of precast concrete plate, finishing the surface of the concrete placed in the formwork was mainly done manually by workers on the production line. This is what is currently being done.

(Problems to be Solved by the Invention) However, since the above-mentioned conventional finishing means are performed manually by an operator, the work requires considerable skill and time; This has caused various problems such as deterioration in performance and productivity.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a finishing method for precast concrete plates that can improve workability and productivity.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a precast concrete plate production line in which the surface of the concrete immediately after being poured into the formwork is A screed means arranged along one side applies a predetermined pressing force, as well as vibrations in the vertical direction and reciprocating motion in the horizontal direction to create a wave action inside at least the surface layer of the concrete, while the surface is a leveling step, a primary step of applying a predetermined pressing force to this surface layer using a disk means and finishing the surface of the concrete while rotating in a plane, and finishing the surface of the concrete by rotating a plurality of blades. The gist is that it consists of a secondary finishing process.

(Function) In the above method, the surface of the concrete immediately after being cast in the formwork by the screed means and the vibration means is leveled while imparting wave action to at least the inside of the surface layer; Next, a predetermined pressing force is applied to this leveled surface layer by a disc means and the concrete surface is firstly finished while rotating in a plane, and further, the concrete surface is secondarily finished while rotating a plurality of blades. Then, a precast concrete board is obtained.

(Example) An example of the method of the present invention will be described below with reference to the drawings.

First, to explain in detail the equipment used in the method of the present invention, in the figure, 1 indicates a part of the production line for precast concrete plates P (hereinafter abbreviated as PC plates P) is the first
As shown in the figure, a large number of flat surface plates 3 on which formwork W is mounted on the conveyor rail section 2 that has been laid.
3 are sequentially and continuously transferred at a predetermined speed, and a steam means (not shown) for keeping each of the surface plates 3 to 3 warm during transportation is provided on the production line 1.
is laid at the bottom of the. And production line 1
Roughly speaking, the PC to be manufactured on the surface plate 3 is
A formwork carrying means (not shown) corresponding to a formwork carrying part where a formwork W corresponding to the plate P is assembled, and a formwork carrying means (not shown) for pouring mixed concrete into the formwork W on the surface plate 3. 1 concrete placing means 4;
a leveling means 5 for leveling the surface layer of the concrete C cast in the formwork W; and a PC board P to be manufactured in which a protrusion or the like is present.
In such cases, a second concrete pouring means 6 is used to further pour concrete into the formwork portion corresponding to the protruding portion, etc., and a primary concrete pouring means 6 is used to pour concrete into the surface layer of the concrete C that has completed the leveling process. Primary finishing and secondary finishing means 7, 8 for performing finishing and secondary finishing
Each device is installed in order.

The leveling means 5 includes a machine stand 10 which is movably mounted on a frame 9 disposed above the production line 1 in a direction orthogonal to the direction in which the surface plate 3 is transferred on the production line 1; It is composed of a screed means 11 and a vibration means 12 which are suspended from a machine base 10 so as to be movable up and down.
The screed means 11 is formed of a long base plate 11a having a substantially rectangular cylindrical cross section and a leveling plate 11b installed on the lower surface of the base plate 11a.
A longitudinal portion of 1a is arranged along one side of the machine base 10 in the direction of transfer of the surface plate 3, that is, one side of the formwork W to be assembled on the surface plate 3, and an appropriate reciprocating drive means is provided. (not shown) is configured to horizontally reciprocate within a predetermined range in the same direction as the direction in which the surface plate 3 is transported. Further, like the screeding means 11, the vibration means 12 is formed of a long base plate 12a having a substantially rectangular cylindrical cross section and a patch plate 12b installed on the lower surface of the base plate 12a. The longitudinal portion of is arranged parallel to the vibration means 12, and an appropriate vibration imparting means (not shown) is provided.
The structure is such that vibrations in the vertical direction are applied.

The second concrete placing means 6 includes a bucket 13 for filling concrete mounted on a cart (not shown) movably disposed along the production line 1, and a bucket 13 disposed above the production line 1. The frame 14 is installed so as to be movable in the transport direction of the surface plate 3 in the production line 1 and in the direction orthogonal to the transport direction, and grips and lifts the bucket 13 to remove the formwork of the surface plate 3. It is comprised of a bucket gripping means 15 for pouring concrete in a bucket 13 into a desired part of the W.

The primary finishing means 7 and the secondary finishing means 8 are installed in a hanging manner with respect to a horizontal portion 16a of a gate-shaped frame 16 which is installed to straddle the manufacturing line 1 and to be movable along the manufacturing line 1. . This primary finishing means 7 is a horizontal part 16a of the frame 16.
On the other hand, there is a main body part 17 which is installed to be horizontally movable and vertically movable along the horizontal part, and a drive part (not shown) which is rotatably supported at the lower part of this main body part 17 and installed in the main body part 17. Similarly to the primary finishing means 7, the secondary finishing means 8 is installed movably along the horizontal portion 16a of the frame 16. a main body 19 rotatably supported on the lower part of the main body 19;
The finishing blade plate 20 has a plurality of plate-like blades extending radially and rotated at high speed by a drive unit (not shown) installed in the finishing blade plate 9. Note that the finishing disk 18 and the finishing vane plate 20 are configured to be able to be deflected to a desired angle with respect to a horizontal plane and to be swingable.

Next, an embodiment of the method of the present invention will be described along with the functions of each of the above-mentioned devices.

Now, in the production line 1, the transport rail section 2
A large number of surface plates 3 to 3 are sequentially transferred at a preset desired speed, and the formwork is first transported to the surface plate 3 corresponding to the formwork transport site. to be manufactured by means (not shown);
For example, a formwork W formed along the outer shape of the four peripheries of a rectangular flat PC board P is placed on top of the surface plate 3 by appropriate means. Then, the surface plate 3 on which the formwork W is placed becomes the first concrete placing means 4.
Once transported to the site, a predetermined amount of mud-like concrete mixed with gravel or the like in a predetermined ratio is poured into the formwork W on the surface plate 3 by the first concrete placing means at the same site. .

Next, when the surface plate 3 is transported to the site of the leveling means 5, the concrete C cast in the formwork W is affected by the screed means 11 and the vibration means 12 in the leveling means 5 at the same site. Perform leveling work. That is, the screed means 1
1 and the vibration means 12, respectively, while applying a predetermined pressing force onto the cast concrete C.
The concrete C is placed along one side, and the base plate 12a of the vibration means 12 is vibrated in the vertical direction by an appropriate vibration imparting means (not shown).
While applying desired vibration to the surface layer of the screed means 11, the base plate 11a of the screed means 11 is horizontally moved within a predetermined range in the same direction as the transport direction of the surface plate 3 by an appropriate horizontal reciprocating drive means (not shown). Leveling work is performed while reciprocating to impart a desired wave action to the surface layer of the concrete C, and the screed means 11 and the vibration means 12 are moved in a direction perpendicular to the direction of conveyance of the surface plate 3. It moves to sequentially level the entire concrete C inside the formwork W. In this case, the poured concrete C is moved by the vibration means 12
Due to the vibration effect caused by the screed means 11 and the wave action caused by the horizontal reciprocating motion caused by the screed means 11, a uniform pouring condition is obtained, and the surface layer is formed so that relatively rough pebbles, etc. in the poured concrete C settle. In addition, the fine particles impregnated in the concrete C that contain a large amount of water will float to the surface layer (also called "slag removal"), so the surface layer of the concrete C should be uniformly leveled. be able to.

Thereafter, the surface plate 3 is transported to the part of the second concrete placing means 6, and if the amount of concrete placed in the formwork W is insufficient, for example at a corner part, the same part is The concrete filling bucket 13 mounted on a trolley (not shown) in the second concrete pouring means 6 is gripped and lifted by the bucket gripping means 15, and the amount of concrete to be poured into the formwork W is adjusted. The concrete in the bucket 13 is poured into the corner by moving to the corner where there is insufficient space. In this case, if the PC board P to be manufactured has protrusions or the like, concrete is further poured into the formwork or the like corresponding to the protrusions.

Next, when the surface plate 3 is transported to the primary finishing and secondary finishing means 7 and 8, it is moved across the manufacturing line 1 and along the manufacturing line 1 in the primary finishing means 7 at the same site. While moving the main body 17 downward relative to the frame 16, the finishing disk 18 is brought into contact with the surface of the concrete C with a predetermined pressing force, and in this state, the finishing disk 18 is rotated at high speed to Provide a primary finish to the surface. At the same time, in the secondary finishing means 8, similarly to the primary finishing means 7, the main body portion 19 is moved downward relative to the frame 16 to bring the finishing vane 20 into contact with the surface of the concrete C with a predetermined pressing force, In this state, the finishing blade plate 20
is rotated at high speed to secondary finish the surface of the concrete C. That is, by the finishing disk 18 rotating at high speed in the primary finishing means 7, first,
The surface layer of the concrete C that has been leveled above is further rubbed up for "sloping out" and the fine particles containing a large amount of water impregnated in the concrete C float to the surface layer to create a smooth structure. Perform finishing, that is, primary finishing. This primary finishing area is further polished by a finishing vane 20 that rotates at high speed in the secondary finishing means 8 to give an extremely smooth finish, that is, a secondary finishing. By moving the finishing and secondary finishing means 7, 8 and moving the frame 16 itself along the production line 1, the entire surface of the concrete C in the formwork W is finished as described above.

Then, the plates are sequentially conveyed to the curing line of the tertiary process of the surface plate, which has completed the above-mentioned finishing work.

In addition, during each process described above, each surface plate 3~
3 is kept warm by a steam means (not shown) installed at the bottom of the production line 1, and the desired temperature is ensured when concrete C is poured. Each step is performed.

In addition, in the above-described primary finishing and secondary finishing means 7 and 8, the finishing disk 18 and the finishing vane plate 20 can be deviated to a desired angle with respect to the horizontal plane, and the poured concrete C It is set as desired depending on the hardness of the material.

(Effects of the Invention) As described above, in the production line of precast concrete plates, the screed means and the vibrator are placed along one side of the formwork against the surface of the concrete immediately after being placed in the formwork. A predetermined pressing force is applied by the concrete C, as well as vertical vibration and horizontal reciprocating motion to impart wave action to at least the inside of the surface layer of the concrete, while absorbing a large amount of moisture impregnated in the concrete C. The surface of the concrete is leveled by floating the fine particles onto the surface layer, and then a predetermined pressing force is applied to the surface layer using a disk means, and the surface of the concrete is further rubbed up while rotating in a plane. The fine particles containing a large amount of moisture impregnated in the concrete C are further floated to the surface for a primary finish, and then a plurality of blades are rotated to rub the surface of the concrete to finish it. This can improve workability and productivity in manufacturing this type of precast concrete plate.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, Fig. 1 is an explanatory diagram showing an overview of the production line, Fig. 2 is a schematic plan view showing the screed means and vibration means in the leveling process, and Fig. 3 is the same. FIG. 4 is a schematic plan view showing primary finishing and secondary finishing means in the finishing process, and FIG. 5 is a side view. 1... Production line, 3... Surface plate, 5... Leveling means, 7... Primary finishing means, 8... Secondary finishing means.

Claims (1)

[Claims] 1. In a production line for precast concrete plates, a predetermined pressing force is applied to the surface of concrete immediately after it is placed in a formwork by screed means and vibration means arranged along one side of the formwork. At the same time, a step of leveling the surface while imparting vertical vibration and horizontal reciprocating motion to impart wave action to at least the inside of the surface layer of the concrete, and a step of applying a predetermined push to the surface layer with a disc means. A precast concrete board characterized by comprising a primary finishing process of finishing the surface of the concrete while applying pressure and rotating in a plane, and a secondary finishing process of finishing the surface of the concrete by rotating a plurality of blades. Finishing method.