JPS61196004A - Method and apparatus for laying pavement block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for laying paving stone blocks for paving roads, plazas, etc.

(Conventional technology) Paving stones manufactured and cured in factories are either roughened by spraying steel grains at the Shimetoplast factory in order to change the surface, and those that are not. Load it and wait.

At the construction site, one of the paving stone blocks mentioned above is brought to the site according to the schedule to finish the subgrade work and leveling of the sand cushion (river sand), and sand it while maintaining a joint gap of 2 to 311@. Lay it out on the cushion by hand or machine.

Next, flat finishing is performed using a compactor (vibrating compaction machine) in order to eliminate the height and height of the arranged sticks and fix them to the sand cushion. At the same time or after this, sand is poured into the joint gaps called joint filling. The method is
Spread sand on the block laying surface with a shovel and sweep it with a broom to fill the joints. Remove any sand remaining on the laying surface. In the case of colored blocks, wash with water and finish laying the blocks.

(Problem to be Solved by the Invention) Assuming that the subgrade, roadbed, and sand cushion of paving stone pavement have been correctly constructed, the quality of the final finishing step, the laying of the paving stones, is determined by block placement and clogging of joint sand. It depends on the situation. You can tell at a glance whether the block placement is good or bad. The degree to which the invisible joint sand is clogged determines the degree to which each block acts in conjunction with external forces. Sufficiently packed joint sand rubs against each other, allowing the blocks to function as a continuous board.

However, in general, paving stone blocks with a thickness of about 80cm are
It may be easy in theory to make the sand adjacent to each other with 2 to 3 joint gaps and to completely fill the narrow joint gaps with sand, but it is not easy in practice. This is because it is not always possible to use only fine sand with good fluidity and low adhesion and cohesion.

In some cases, only the upper part of the joint is filled with sand,
Even if the block is contained in a low-density state, if the entire block is not, it will be extremely difficult to find that part during inspection, which may cause the block to move or tilt at a later date.

As a countermeasure, after laying the sand cushion on a soft, level surface and laying paving stone blocks on top of it, the blocks are pushed down 15 to 20 meters using a special compactor, allowing the sand from the sand cushion to enter the joints from below. I try to get into it. In other words, out of the joints with a depth of approximately 80W, only the lowest 15 to 20 meters were made sure to contain joint sand. The area above that level is simply swept away with a broom, a construction method that leaves doubts as to how much the area is filled. Moreover, with this construction method, even if all the joint gaps are ideally filled with sand by applying vibration, it is sand that has been dropped in, not sand that has been packed in.

Sand that falls into a narrow gap maintains many voids between sand grains, between sand grains, and between sand grains and surfaces. Unless the sand is packed so as to eliminate the voids, the force that prevents the block from moving is weak. Although this is obvious, in the case of paving stone blocks, the joints are usually curved, so there is no easy way to pack them in, and no idea has been devised to pack them in.

(Means for solving the problem) Therefore, this invention lays paving stone blocks on a sand cushion with joint gaps maintained over the entire area or in sectioned areas, and sequentially sandblasts the laid blocks. This is a paving stone block laying method characterized by roughening the surface of the four-piece block and injecting plastic sand into the joint gaps.

The present invention also includes a compactor that moves over the paving stone blocks laid out on a sand cushion, and a sandblasting device that is attached to the compactor and blows sand using compressed air onto the upper surface of the paving stone blocks and into the joint gaps between the paving stone blocks. This is a paving stone block laying device featuring:

(Function) The main purpose of this invention is to develop a simple method and device for vertically packing sand into the joint gaps of paving stone blocks laid out side by side.
The objective was achieved by introducing sandblasting.

Sandblasting is effective not only for cleaning and polishing metal surfaces, but also for creating a rough satin pattern on the surface of concrete blocks. Sand is placed on a jet of compressed air and pounded onto the target surface. This was used as a means of filling the gaps with sand.

As before, the part of the sand sprayed at high speed from the nozzle that hits the block surface destroys the block surface layer and scatters along with the debris, creating a rough satin surface. The amount of sand that has flown into the joint gap is either directly slammed onto the sand cushion at the bottom of the joint, or onto the sand that has accumulated at the bottom of the step, or runs along the side walls of the joint gap, that is, the sides of the blocks, and accumulates at the bottom.

The air flow that enters the joint gap with the sand is blocked by the curved joint gap and quickly loses its force, but the heavy sand maintains the high speed of the jet and is slammed into the bottom of the joint.

Since the spray nozzle of the sandblasting device moves over the blocks laid out, the joint gap at a certain position is initially
The jet is received diagonally from behind, and then the angle of the jet changes to come from directly above and then from the front.

The upper edge of the joint is open as shown in Figure 2, so even a diagonal jet will drop some sand into the joint, but the action of pushing sand into the joint is due to the fact that the nozzle is near the top. I only work when I'm here. Therefore, if the moving speed of the nozzle is too fast, the sand will not be able to fill the joint, but the compressed air pressure, the amount of sand, etc., as well as the moving speed can be determined by conducting one or two experiments on site.

The laying method of this invention not only fills the joints with sand, but also roughens the surface of the block, which is the nature of sandblasting. Therefore, the shot blasting process at the block manufacturing factory is no longer necessary, and the materials that are blasted and not blasted in the warehouse are There is no need to store two types.

In the laying device of the present invention, part or all of the sandblasting device is attached to the compactor and moved together. Therefore, when this compactor is advanced over the blocks laid out side by side, the planar finishing and joint filling of the blocks will be done at the same time. In this case, the width of the compactor diaphragm and the width of the area for reliable joint filling by sandblasting are ! It is best to use a combination of both that are equal.

When a compactor is applied to the same area two or three times as in the past, the amount of plastic sand used to fill the joints at one time is reduced accordingly.

(Example) FIG. 1 shows a situation in which the compactor with a sandblasting nozzle of the paving stone block laying apparatus of the present invention is used at a site. Figure 2 shows the relationship between the nozzle and the block.
Figure 3 shows the top surface of a state in which interlocking blocks are laid out as paving stone blocks. There are many types of block shapes, and simple brick-like paving stones are also acceptable.

In Figure 1, the compactor is 11, the arm sticking out from it is 2,
The nozzle of the sandblasting device is 3, and its dustproof 7-door is μ.
, the hose is 5, the sandblasting equipment is 6, the air compressor is ≦α, the air reservoir is ≦b, and the sand blower is 6C. B
is a paving stone block, 0 is a sand cushion, D is a roadbed, E
is the roadbed and M is the person.

Compactor L is a commercially available product, and it is equipped with 3 nozzles with a hood.
It is a simple device that just has a support arm 2 attached to it, and person M holds the handle and while applying vibration and sandblasting, checks the amount of sand that has been driven into the joint at a walking speed or a moderate speed. Push forward while doing so. Compactor l indicates one with an engine, but if it is electric, it is connected to the power source with an electric wire.

The nozzle J, the hose j1, and the sandblasting equipment 6 are also well known, and the dustproof 7-dog is made according to the spacing between the nozzle/I/3 and the block 3. Although the lower edge of the hood μ was made to be located slightly above the surface of the block B, a rubber plate may be wrapped around the lower edge and the hood μ may be slid on the surface of the block 3. This is good because concrete powder does not fly out, but powder and sand accumulates inside the hood, so sometimes you have to lift it out or use a powerful dust vacuum to suck it out.

In the embodiment of the laying apparatus shown in FIG. 4, two compactors 1 are connected by a machine frame 7, and a sandblasting nozzle 3 is attached to the center thereof so that the angle of inclination can be adjusted.

Loosen or tighten handle j to determine the angle of inclination.

In this case, the sand supply hose jα and the compressed air hose sb are separately connected to the nozzle 3. In addition to the air reservoir 6b on the top of the machine frame 7, a vacuum tank IQ for dust suction is also installed, and all dust and sand are sucked out from the inside of the large dustproof hood, and the 7-Doda can be lifted as shown by the chain line. It also makes it possible to scrape out sand that cannot be sucked up. A brush bag is attached to the hem of the hood.

The material is anti-vibration rubber. As the nozzle 3, one for rotary injection is also used.

The compactor and nozzle 3 go all the way around the block laying surface, and after finishing the flat surface and filling the joints, the work is completed by cleaning the sand and concrete powder remaining on the surface.

Furthermore, it is thought that practical improvements will be made to this new type of sandblasting joint filling through future research and ingenuity by on-site engineers. Research topics include improving the compaction of joint sand using wet sandblasting.

(Effects of the Invention) This invention shows that in the construction of paving stone blocks, the conventional joint filling method, in which sand is dropped into narrow joint gaps approximately 80 m deep and 2 to 3 cm wide using only gravity and vibration, is In contrast, we focused on the point that is sufficient to connect the blocks, and developed a new joint filling method that uses sandblasting to press sand into even the curved joint gaps. The compressed air pressure for sandblasting can be changed freely, so a simple on-site test allows you to select the best air pressure for filling the joints and proceed with the work while checking the results. Sand that is driven by air jets and thrown into joint gaps has fewer voids than sand that has been dropped into the joint, and has far greater resistance to external forces.

In addition, since the block surface is roughened on-site by sandblasting, not only does sandblasting at the factory become unnecessary, but it can also be sprayed from above the mask for road markings to create rough letters and symbols on the paving stone pavement surface. I can draw.

And, the sandblasting device of the laying device of this invention,
Since it is attached to the compactor, if you proceed with the compactor and finish the flat surface as usual, it will also perform strong joint filling at the same time, eliminating the traditional joint filling work of spreading sand or sweeping with a broom. It disappears.

If you attach a sandblasting nozzle in front of the compactor, the block will sink into the sand cushion after filling the joint, and the most vertical and clogged part at the bottom of the joint will be pushed up a little, removing the sand that was in the relatively soft top of the joint. It comes out to the top of the block and is removed during the final cleaning. Also, if you attach a nozzle after the compactor, the block will sink into the sand cushion and the plastic sand will be packed on top of the sand that has entered the joint gap from below, so the sand that has simply entered from below will be treated like plastic sand. Compressed.

Since the quality of the strength of paving stone block pavement is greatly influenced by the joint sand, the technical effect of this invention, which enables the joint sand to be firmly and reliably packed, is significant.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of this inventive device, Fig. 2 is an explanatory diagram of this inventive construction method, Fig. 3 is a top view of an example of paving stone blocks laid out in rows, and Fig. 4 is an illustration of another example of this inventive device. It is an example explanatory diagram. l... compactor, 3... sandblasting device (injection nozzle), 6... sandblasting equipment.

Claims (2)

[Claims] (1) Lay the paving stone blocks on a sand cushion with the joint gaps maintained over the entire area or in sectioned areas. Sandblast is sequentially applied to the laid blocks to roughen the block surface, and the joint gaps are A paving stone block laying method characterized by the injection of heblast sand. (2) A compactor that moves over the paving stone blocks laid out on a sand cushion, and a sandblasting device attached to this compactor that blows sand using compressed air onto the upper surface of the paving stone blocks and into the joint gaps between the paving stone blocks. A paving stone block laying device characterized by: