JPH09267319A - Apparatus for finishing inner surface of centrifugal molded concrete liner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, automatically and smoothly finish the inner surface of a arcuate plate-shaped concrete liner, by providing the press surface plate coming into close contact with the entire inner surface of concrete and a vibration device for imparting vibration to the press surface plate. SOLUTION: A molding box 20 after the completion of a centrifugal molding process is positioned and fixed on a molding box support stand 21 and the lid plate of the molding box 20 is removed. Subsequently, the inner surface finish device standing by on a rail 12 in a right lateral direction is moved to the part just above the molding box 20. At this time, the press surface plate 2 is set to the state drawn up to the upper position 2a by a hydraulic cylinder 4. The inner surface finish device 1 is moved by the wheels 13 of a truck 10 and a drive motor 14 to be stopped at an accurate position. Next, the hydraulic cylinder 4 is stretched to bring the press surface plate 2 into contact with the upper surface of the molding box and the pressing force of the hydraulic cylinder is increased while a vibration device is vibrated to bring the press surface plate 2 into close contact with the upper surface of concrete. At this time, the reaction force of the pressing force of the hydraulic cylinder 4 is supported by a reaction force bracket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface finishing device for a centrifugally molded concrete liner used in a shield construction method and a propulsion construction method.

[0002]

2. Description of the Related Art A circular arc plate-shaped concrete liner manufactured by centrifugal molding has excellent characteristics such as a dense concrete, high strength, high dimensional accuracy, and water-tightness of the liner body. However, the inner surface of the arc (inner surface) has a risetance and lift of cement milk, and it is necessary to finish the inner surface after concrete molding and before curing. For such internal finishing, trowel finishing by human power has been conventionally performed, but since it is an inefficient work, improvement has been desired.

In Japanese Unexamined Patent Publication (Kokai) No. 6-54157, after centrifugal compaction of concrete, the surface layer of concrete that has not solidified yet in the formwork is subjected to fine roughening to make it a rough surface, and then this rough surface is flattened. A method and an automatic device for leveling and smoothing the surface of a trowel are disclosed.

[0004]

[Patent Document 1] Japanese Patent Application Laid-Open No. 6-54157
The technique disclosed in Japanese Patent Publication has many finishing work steps, and there is a problem that the precision of the finishing surface is slightly poor, and further improvement is desired. It is an object of the present invention to provide a novel centrifugal molding concrete liner inner surface finishing device that solves the above problems.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and removes a lid on the inner surface of concrete centrifugally molded in the form of an individual concrete liner to care for the inner surface. A centrifugally-molded concrete liner inner surface finishing apparatus, comprising: a press face plate that is in close contact with the entire inner surface of concrete; and a vibrating device that applies vibration to the press face plate.

This inner surface finishing device pushes the press face plate.
Applied force is 0.1 to 2.0 kgf / cm ^Two , The vibration device
Has an amplitude of 0.2 to 1.5 mm and a frequency of 1500 to 500
It is suitable to set it to 0 rpm. The pressing force of the press face plate is
Unit area to even out unevenness on the concrete surface
0.1kgf / cm^Two More surface pressure is required.
If less than, perfect homogenization is not achieved. However, the pressing force
Surface pressure 2.0kgf / cm ^Two It is useless to press it beyond
2.0 kg / cm^Two Is the upper limit. Sa
And preferably 0.3 to 1.0 kgf / cm^Two And
Optimally 0.4 to 0.6 kgf / cm^Two And Vibration equipment
The pressing force is applied to the table by vibrating the press face plate.
In other words, press the plate surface and the concrete surface in close contact
Things. This vibration device has an amplitude of 0.2 to 1.
A vibration device of 5 mm and frequency 1500-5000 rpm
It is suitable to use. Amplitude is too small when less than 0.2 mm
Therefore, it took a long time because of the lack of uniformity of the concrete surface.
If it exceeds 5 mm, concrete will deteriorate, so it is limited.
It is. A more preferable range is 0.3 to 1.0 m.
m, optimally 0.4 to 0.7 mm. Frequency is 15
If it is less than 00 rpm, the vibration is not sufficient and it is 5000 rpm.
If it exceeds the limit, problems will occur in terms of equipment.
00 rpm is preferable, and more preferably 3500 to 450
It may be 0 rpm, for example about 4000 rpm.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of the embodiment, and FIG.
Is a side view thereof. A formwork 20 of an arc plate concrete liner is placed on a formwork support 21 on a floor slab frame 11 provided on the floor of a centrifugal molding factory. Formwork 20
Inside is filled with cast concrete in a centrifugally compacted state, removed from a centrifugal molding drum (not shown) and transported, and the cover plate on the arc inner surface side is removed to expose the concrete. The formwork 20 is placed on the formwork support 21 with the exposed concrete surface facing upward.

The inner surface finishing device 1 according to the present invention comprises a form supporting base 2
It is constructed on a trolley 10 that travels on rails 12 laid on a floor slab frame 11 with 1 interposed therebetween. This trolley has wheels 13, and the wheels 13 are rotationally driven by a drive motor 14. The current collecting reel 15 winds and unwinds the power cable as the carriage 10 moves. Reaction force brackets 16 for preventing the bogie 10 from being lifted are attached to the floor slab frame 11 on both sides of the rail 12 so as to abut the upper surface of the bogie 10.

A frame frame 3 is provided on the left and right carriages 10, and a press face plate 2 is hung from the frame frame 3 via a hydraulic cylinder 4. The press face plate 2 has an arcuate curved surface whose lower surface abuts on the concrete upper surface in the formwork 20. This surface forms a concrete finish surface and has a smooth mirror surface. Press face plate 2
Form a press mechanism that is suspended from the frame 3 via the hydraulic cylinder 4 and is equipped with the hydraulic cylinder 4 so as to be pressed against the upper surface of the concrete in the formwork. The hydraulic cylinder 4 is mounted on a suspension bracket 5 mounted on the frame frame 3, and the tip of the ram is pin-connected to a mounting bracket 6 on the back surface of the press face plate 2. In the illustrated embodiment, a mounting bracket 6 which is long in the bending direction of the pressing face plate is provided at the center of the back surface of the pressing face plate 2, pins are provided at both ends in the longitudinal direction of the mounting bracket 6, and four hydraulic cylinders 4 are provided on the pins. The ram tips are connected to each other so that the press face plate 2 can be pressed against the concrete face in a well-balanced manner. But,
The number of the hydraulic cylinders, the mounting position, etc. are not limited at all, and the form is not limited as long as the press face plate 2 can be uniformly pressed against the concrete.

A vibrating device 7 is attached to the upper surface (rear surface) of the press face plate 2. This vibrating device 7 presses the press face plate 2 when the press face plate 2 is pressed against the concrete upper surface.
Vibration is applied to the concrete surface so that the lower surface of the press face plate 2 uniformly adheres to the concrete. In this way, the interaction between the pressing and the vibration of the press face plate 2 allows the concrete upper surface and the press face plate lower surface to be brought into uniform contact with each other, and the concrete surface can be finished uniformly.

The method of using the centrifugal molding concrete liner inner surface finishing device of the present invention is as follows. The mold 20 for which the centrifugal molding process has been completed is positioned and fixed on the mold support 21 and the cover plate of the mold 20 is removed. This lid plate removal is
It may be carried out before carrying it on the formwork support 21. Then, the inner surface finishing device 1 waiting on the rail 12 in the right lateral direction in FIG. 1 is moved to directly above the form 20. At this time, the press face plate 2 has the hydraulic cylinder 4 shown in FIG.
It is in a state of being pulled up to an upper position indicated by 2a. The movement of the inner surface finishing device 1 is performed by the wheels 13 of the carriage 10 and the drive motor 14, and stopped at an accurate position by a limit switch or the like not shown. Then, the hydraulic cylinder 4 is extended to bring the press face plate 2 into contact with the upper surface of the form 20, and the vibration device 7 is vibrated while the hydraulic cylinder 4 is being vibrated.
The pressing force is increased to bring the press face plate 2 into close contact with the concrete upper surface. At this time, the reaction force of the pressing force of the hydraulic cylinder 4 is supported by the reaction force bracket 16.

The pressing force of the hydraulic cylinder 4 is the pressing face plate 2
With the surface pressure of the pressing surface of 0.4 to 0.6 kgf / cm ² ,
The vibration device 7 has an amplitude of about 0.6 mm and a vibration frequency of 3500 to 4
Vibrate at 500 rpm and the pressing time is 3 to 10 minutes.
When the pressing is finished, the press face plate 2 is pulled up, the inner surface finishing device is retracted, and the lower surface of the press face plate 2 is cleaned. The form 20 is transferred to the next step.

The apparatus of the above embodiment is constructed so that the mold 20 is fixed and the inner finishing device 1 is moved. However, the inner finishing device 1 is fixed at a fixed position so that the mold 20 is moved. May be. An inner surface finishing device for a centrifugally formed tunnel liner of the present invention is an automatic device equipped with a press device and a vibration applying device, which is labor-saving, has excellent inner surface finishing, and obtains a centrifugally formed concrete liner product having uniform quality performance. You can

[0014]

Since the inner surface finishing device for a centrifugally molded concrete liner according to the present invention is constructed as described above, the inner surface of the circular arc plate-shaped concrete liner can be easily and automatically smoothed to obtain a high quality. Excellent products can be manufactured.

[Brief description of drawings]

FIG. 1 is a side view of a centrifugally molded concrete liner inner surface finishing device of an embodiment.

2 is a front view of the centrifugal molding concrete liner inner surface finishing device of FIG. 1. FIG.

[Explanation of symbols]

 1 Inner Surface Finishing Device 2 Press Face Plate 3 Frame Frame 4 Hydraulic Cylinder 5 Suspension Bracket 6 Mounting Bracket 7 Vibration Device 10 Bogie 11 Floor Slab Frame 12 Rail 13 Wheels 14 Drive Motor 15 Current Collecting Reel 16 Reaction Bracket 20 Form 21 Frame support

Claims (2)

[Claims] 1. In a centrifugally-molded concrete liner inner surface finishing device for removing the inner surface lid of centrifugally molded concrete in the form of an individual concrete liner to clean the inner surface, a press face plate that adheres to the entire inner surface of the concrete, and the press. An inner surface finishing device for centrifugally molded concrete liner, comprising: a vibrating device for applying vibration to a face plate. 2. The pressing force of the press face plate is 0.1 to 2.
0 kgf / cm ² , the vibration device has an amplitude of 0.2 to 1.
The centrifugally finished concrete liner inner surface finishing device according to claim 1, wherein the device has a frequency of 5 mm and a frequency of 1500 to 5000 rpm.