JPH0441204A - Finishing method of precast concrete board - Google Patents

Abstract

PURPOSE:To improve workability and productivity by levelling a surface through a screed means and a vibration means to the surface of concrete immediately after concrete is placed in forms, primarily finishing the surface by disc means and secondarily finishing the surface by turning a plurality of blades. CONSTITUTION:When a surface plate 3, to which forms W are fixed, is carried to the section of a concrete placing means 4 in a production line 1, a fixed quantity of kneaded muddy concrete are placed in the forms W. When the surface plate 3 is carried to the section of a levelling means 5, levelling operation is conducted to concrete C placed in the forms W through a screed means 11 and a vibration means 12. A disc 18 for finishing is abutted against the surface of concrete C by specified pushing force in a primary finishing means 7, and the disc 18 for finishing is turned at high speed and the surface of concrete C is primarily finished. A blade disc 20 for finishing is abutted against the surface of concrete C by specified pushing force in a secondary finishing means 8 at the same time, and the blade disc 20 for finishing is rotated at high speed and a surface is secondarily finished.

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 manually performed by an operator, the work requires considerable skill and time, and naturally 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 method for producing cast concrete plates on the surface of concrete immediately after being placed in the formwork, in a production line for precast concrete plates. A screed means disposed along one side applies a predetermined pressing force, as well as vibrations in the vertical direction and reciprocating motion in the horizontal direction, thereby creating a wave action inside at least the surface layer of the concrete and leveling the surface. a primary finishing step of finishing the surface of the concrete by applying a predetermined pressing force to the surface layer using a disc means and rotating it in a plane; and a primary finishing step of 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 is leveled by applying wave action to at least the inside of the surface layer by the screed means and the vibration means, and then the surface is leveled. , A predetermined pressing force is applied to this leveled surface layer by a disk 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. A precast concrete board is obtained using the same method.

(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 apparatus used in the method of the present invention, in the figure, 1 is a precast concrete plate P (
As shown in FIG. The plate-shaped surface plates 3 to 3 are configured to be sequentially and continuously transferred at a predetermined speed, and furthermore, each platen 3 to 3 is continuously transferred at a predetermined speed. ! ! 3～3
A steam means (not shown) is installed at the bottom of the production line 1 to keep the temperature of the product heated. Roughly speaking, the production line 1 includes a formwork carrying means (not shown) corresponding to a formwork carrying part where a formwork W corresponding to the PCC 18 to be manufactured is assembled on the surface plate 3, and a formwork carrying means (not shown) for carrying out the mixed concrete. A first concrete pouring means 4 for pouring concrete into the formwork W on the surface plate 3, and a leveling means for leveling the surface layer of the concrete C placed in the formwork W. means 5, and a second concrete pouring step, in which, in the case of a 1WPC board P in which the PCC18 protrusions, etc. to be manufactured are present, concrete is further poured into the formwork, etc. corresponding to the protrusions M, etc. Means 6
and primary finishing and secondary finishing means 7.8@ for performing primary finishing and secondary finishing on the surface layer of the concrete C which has completed the leveling process are installed in order.

The leveling means 5 is fixed to the production line 1 with respect to the frame 9 disposed above the production line 1!
3, and a screed means 11 and a vibration means 12, which are suspended from the machine base 10 so as to be movable up and down.

The screed means 11 is formed from a long base (I!11a) having a rectangular cylindrical cross section and a leveling plate 11b installed on the lower surface of the rigging a'+ia, and the longitudinal portion of the base plate 11a is is arranged along one side of the machine base 10 in the same direction as the transfer direction of the prosthetic leg W3, that is, one side of the formwork W to be assembled on the surface plate 3, and an appropriate reciprocating drive means (
(not shown), it is configured to be horizontally reciprocated within a predetermined range in the same direction as the transport direction of the prosthetic leg W3. Further, the vibration means 12 is the screed means 11.
Similarly, the cross section is formed from a long base M'I2a having a rectangular cylindrical shape and a backing plate 12b driven into the lower surface of the rigging W12a, and the longitudinal portion of the base M12a is parallel to the vibration means 12. It is arranged such that vertical vibrations are applied by appropriate vibration applying means (not shown).

The second concrete placing means 6 is connected to the production line 1.
A concrete filling packet 13 mounted on a cart (not shown) movably arranged along and a direction perpendicular to the transport direction of the packet 1.
and a packet gripping means 15 for gripping and lifting the packet 3 and pouring concrete in the packet 13 into a desired portion of the formwork W of the surface plate 3.

The secondary finishing means 7 and the secondary finishing means 8 are installed in a hanging manner with respect to the horizontal part 16a of a gate-shaped frame 16 which is installed to straddle the production line 1 and to be movable along the production line 1. There is. This finishing means 7 is installed to be movable horizontally and vertically along the horizontal part 16a of the frame 16, and is connected to the main body 17 and the main body 1.
A finishing circumferential circle W18 is rotatably supported at the lower part of the main body 17 and rotated at high speed by a drive unit (not shown) installed in the main body 17. Similar to the finishing means 7, it is installed movably along the horizontal part 16a of the frame 16, and has a main body part 19, and is rotatably supported in the lower part of the main body part 19 and inside the main body part 19. Installed drive unit (not shown)
W4 is made up of a finishing monthly m board 20 having a plurality of plate-shaped blades which are rotated at high speed and extended radially. In addition,
The finishing circumference l118 and the finishing blade 1 [20 are configured to be able to be deflected to a desired angle with respect to the horizontal plane and swing freely.

Next, an embodiment of the method of the present invention will be explained along with the effects of each of the pupil closures described above.

Now, in the production line 1, a large number of constants W3 to 3 are sequentially and continuously transferred on the conveyor rail 8I12 at a preset desired speed. A formwork W formed along the outer shape of the four circumferences of, for example, a rectangular flat PC board P to be manufactured, for example, is mounted on a formwork transporting means (not shown) corresponding to the transport site, and the formwork is determined by appropriate means. Place it on I3. When the fixed 1f3 with the formwork W fixed thereon is transported to the first concrete placing means 4, the first concrete placing means 4 in the same place mixes gravel and the like in a predetermined ratio. A predetermined amount of concrete is poured into the formwork W on the surface plate 3.

Next, when the concrete I3 is conveyed to the leveling means 5, the concrete C cast in the formwork W is leveled by the screed means 11 and vibration means 12 in the leveling means 5 at the same position. do the work. That is, the respective base plates 118.12a of the screed means 11 and the vibration means 12 are moved down and placed along one side of the formwork W while applying a predetermined pressing force onto the poured concrete C. Then, the base 1<12a of the vibration means 12 is vibrated in the vertical direction by an appropriate vibration imparting means (not shown) to impart desired vibration to the surface layer of the concrete C, and the base of the screed means 11 is 11a is horizontally reciprocated 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), while imparting a desired wave action to the surface layer of the concrete C. Leveling work is carried out, and the screed means 11 and vibration means 12 are moved in a direction perpendicular to the direction of transport of the window 1g3 to sequentially level the entire concrete C within the formwork W. In this case, the poured concrete C obtains a uniform placing condition due to the vibration action by the vibration means 12 and the wave action caused by the horizontal reciprocating motion by the screed means 11, and the surface layer of the concrete C is Relatively rough pebbles and the like in the concrete C settle down, and the fine particles impregnated in the concrete C that contain a large amount of water rise to the surface layer (also referred to as "cutting out"). ), so the surface layer of the concrete C can be evenly leveled.

After that, the fixed IIM 3 is transported to the part of the second concrete placing means 6, and if there is insufficient concrete placement in the formwork W, for example in a corner part, the concrete is placed in the same part. Table I in the second concrete placing means 6
The packet 13 for concrete filling loaded on the container (not shown) is gripped by the packet gripping means 15, lifted up, and moved to, for example, a corner of the formwork W where the amount of concrete to be poured is insufficient. The concrete in the packet 13 is placed at the relevant location. In this case, if the PC board P to be manufactured has protrusions etc.,
Concrete is then poured into a formwork corresponding to the protrusion.

Then, constant W3 is the primary finishing and secondary finishing means 7.8
When transported to the site, the primary finishing means 7 at the same site cuts the main body 17 against the frame 16 which straddles the manufacturing line 1 and is movable along the manufacturing line 1.
At the same time, the finishing circle W18 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 primarily finish the surface of the concrete C. At the same time, in the secondary finishing means 8, similarly to the secondary finishing means 7, the main body portion 19 is moved downward relative to the frame 16 to bring the finishing blade W20 into contact with the surface of the concrete C with a predetermined pressing force, In this state, the finishing blade W2o is rotated at high speed to remove the concrete C.
Secondary finishing of the surface. That is, the -next finishing means 7
First, by the finishing disk 18 rotating at high speed,
The surface layer of the concrete C that has been leveled above is further rubbed up to remove the slag, and the fine particles impregnated in the concrete C, which contain a large amount of moisture, float to the surface layer to create a smooth surface. Perform rough finishing, that is, -next finishing. This secondary finishing area is further polished by the finishing blade W20 rotating at high speed in the secondary finishing means 8 to give an extremely smooth finish, that is, a secondary finishing. By movement of the secondary finishing means 7.8 and movement of 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 surface plate 3 that has undergone the above-mentioned finishing work is sequentially transported to the curing line for the next process.

In addition, during each of the above-mentioned processes, the multi-legged feet 113 to 3 are kept warm by a steam means (not shown) installed at the bottom of the production line 1, so that the desired temperature is maintained during pouring of the concrete C. Under this condition, the above-mentioned steps after pouring concrete C are carried out.

In addition, in the above-described primary finishing and secondary finishing means 7.8, the finishing disk 18 and the finishing blades 1 and 20 can be deflected at a desired angle with respect to the horizontal plane,
It is set as desired depending on the hardness of the poured concrete C.

(Effects of the Invention) As described above, in a precast concrete board manufacturing line, the screed means and the vibration means are arranged along one side of the formwork against the surface of concrete immediately after being placed in the formwork. fine particles containing a large amount of moisture impregnated in the concrete C while applying a predetermined pressing force and applying vertical vibration and horizontal reciprocating motion to create a wave action inside at least the surface layer of the concrete. The surface of the concrete is leveled by floating the portion onto the surface layer, and then a predetermined pressing force is applied to this surface layer by 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 water impregnated in the concrete C are further floated to the surface to provide 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 board.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, FIG. 1 is an explanatory diagram showing an overview of the production line, FIG. 2 is a road body plan view showing screed means and vibration means in the leveling process, and FIG.
4 is a road body 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...-Next finishing means 8-...Secondary finishing means

Claims (1)

[Claims] 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 means of a screed means and a vibration means arranged along one side of the formwork, and the upper and lower a step of leveling the surface while imparting directional vibration and horizontal reciprocating motion to impart wave action to at least the inside of the surface layer of the concrete; and applying a predetermined pressing force to the surface layer by a disc means. A method for finishing a precast concrete board, comprising: a primary finishing step in which the surface of the concrete is finished while rotating in a plane; and a secondary finishing step in which the surface of the concrete is finished by rotating a plurality of blades.