KR100381056B1 - Construction method of porous concrete for river bank and surface - Google Patents

Abstract

The present invention relates to a construction method of porous concrete for use on river banks and surface.

Notice that the present invention is composed of aggregate material, and a admixture of 1 ~ 40kg / m ³ of 1m ³ per 300 ~ 400kg / m ³ of pooh trend with cement, 100 ~ 200kg / m ³ of water and, 1200 ~ 2100kg / m ³ The porous concrete mixture is laid on the sloped surface of the river and then cured by flattening and compacting using a cylinder finisher.

Description

Construction method of porous concrete for river banks and slopes {.}

The present invention relates to a method for producing porous concrete, and more particularly, to a method for constructing porous concrete used for river banks and surface.

In general, the groundwater is conserved under normal rainwater to maintain the groundwater and maintain the normal strength of the ground, most asphalt and concrete pavement, such as to prevent the rainwater to penetrate the ground, thereby reducing the amount of groundwater rapidly, Due to the ground subsidence, slowing the growth of trees, and the ecological environment of the aquatic organisms, it is the cause of rainwater overflowing in the pavement area. To correct this, in recent years, urban development and landscaping work Pavement methods using concrete having water permeability have been developed for the purpose of reducing rainwater to the ground naturally.

What is required in the conventional water-permeable concrete is to give the bending strength and tensile strength that is urgently required in the paving construction and to prevent cracking of the finished package.

In most cases, permeable concrete has sufficient strength and relatively high permeability coefficients between 10 ^-0 × 1 cm / sec and 6 × 10 ^-1 cm / sec Can be represented. In the permeable concrete, the particle size distribution of the aggregate for the appearance of road surface is 100% of the weight of 13mm sieve, 70-100% of the weight of 8mm sieve, and the percentage of the weight of 2.5mm sieve The 1 to 15% particle size distribution is used. If the porosity of the road is large, the permeability is good, but the binding strength is weak and the appearance is poor, which can cause vibration of the driving vehicle.If the porosity is too small, the appearance is good but the permeability is in consideration of the poor permeability. The general construction method of such conventional water-permeable concrete is to install a 40mm thick aggregate on the base of a sidewalk or a square, and then install permeable concrete of a certain thickness on the top with a fork crane or finisher, and then use tandem to maintain strength. Voltage by roller, covered with vinyl and cured, installed by shrinkage expansion prevention joint and finishing after surface coating treatment with epoxy etc.

Such water-permeable concrete is to be provided to be installed on the road surface, such as roads, as well known, it was not able to be installed on the river banks and slope slope. Specifically, the water-permeable used for road pavement Concrete uses relatively small granular aggregates of 10mm ~ 13mm to maintain even surface for road paving, and it has to be compacted by roller to maintain strength. I could not.

The shores and slopes of the rivers do not destroy the natural ecosystem if the vegetation of the plants is possible even after the concrete is laid. In addition, unlike a general road or a road having a slight inclination angle, the slope of the river can not be weighted down and should be tilted, but the ratio of the composition of concrete that can maintain sufficient strength even if it is tilted is required.

Up to now, the construction of river banks and banks has mostly been carried out by lake blocks. Prior to the development of concrete with voids, these revetment blocks were used to be made of ordinary concrete, which is simply to prevent erosion of the dikes, and because they did not provide the conditions for plant growth. Due to the serious problem of environmental protection in recent years, the revetment block has been identified as the cause of destruction of the river environment and ecosystem.

As a solution to this problem, a porous concrete block for vegetation of plants is disclosed in Patent Publication No. 10-2001-27247, 'Porous Concrete Block for Creating a Vegetation Foundation' and Patent Application No. 10-1999-35489 'Economic Stabilization Block'. .

These porous blocks have a porosity of 15%, are made of concrete with a specific shape, and the soil is filled with spaces so that the roots of plants can be settled by the soil filled therein. In order to construct concrete blocks in a river, first, a block must be prepared and then a space for yarding be prepared, transported to the construction site, and construction work for connecting or stacking blocks cannot be completed by mechanization. The dependence requires a lot of construction manpower and labor and a considerable amount of time spent on construction. In addition, the concrete itself is not able to settle in plants, but relies on the earth and sand filled in the space formed in the block, so it requires more labor and time to fill the earth and sand during construction, Is lost, the plant cannot grow. In addition, another common problem of the general landscaping concrete block or vegetation porous block is that there is a gap between the blocks while connecting the blocks, in which the soil under the porous block may be lost. In detail, the velocity of the fluid is faster in a narrow place than in a wide area through which the fluid passes in a general flow of fluid. Is sometimes eroded and lost its dike, thus failing to act as a safeguard.

The present invention is distinguished from conventional water-permeable concrete by the mixing conditions defined using materials of physical properties that are already known as a material for producing water-permeable concrete, and in particular, excellent physical properties by construction on the river bank and sloped surface It is to provide a method that can be installed on the river banks and the surface of the river by using the concrete concrete having the properties that can be planted and settled while showing.

Permeable concrete to achieve the purpose of the invention is intended is 1m and 300 ~ pooh trend cement of 400kg / m ³ per ^3, and of 100 ~ 200kg / m ³ of water and, 1200 - 2100kg / m ³ Aggregate 1 Known porous concrete consisting of admixtures of ˜40 kg / m ³ will be used.

For concrete concrete, the mixture of cement and water should be about 30 to 45% by weight, which corresponds to 300 to 400 kg per 1 m ^{3 of the} total concrete mixture containing the portland cement and water, more preferably 320 to 380 kg. When the amount of cement is about 380 kg or more, the strength increases, but the permeability deteriorates and is not suitable for the purpose of the present invention. On the contrary, if the amount of cement is less than 320 kg, the strength is insufficient.

In addition, cement is increased by about 10% by weight than ordinary porous concrete, which is to prevent the peeling phenomenon and to enhance the strength.

If the amount of water is 50% by weight or more, the water permeability is poor, when the amount of water is 30% by weight or less, it becomes difficult to stir for blending the mixture and lowers the bending strength of the finished package.

Aggregates use single-grain aggregates of 25 to 13 mm with a maximum dimension of 25 mm.For coarse aggregates where the percent by weight of the 13 mm sieve does not exceed 1 to 20 percent by weight, the percent by weight of the 5 mm sieve is 100% and 1.2. The fine aggregate of 5 mm or less, or sand, of which the percent by weight of the mm sieve becomes 1 to 15% by weight, is mixed to be 5 to 20% by weight of the total aggregate.

In addition, the aggregate uses 20 to 13 mm single-grain aggregates, the maximum size of the aggregate is 20 mm, the coarse aggregate of 13 mm or less sieve does not exceed 1 to 20 wt%, the passing weight percentage of 5 mm sieve 100% by weight of the aggregate aggregate of 5mm or less, which is 1-15% by weight of the passing weight percentage of the 1.2mm sieve, is mixed and used to be 5-20% by weight of the total aggregate.

In the porous concrete applied to the present invention, the value close to the lower limit in the particle size range of the aggregate, which is limited to the percentage of passage through the sieve, is closely related to the permeability performance, and in particular, directly related to the conditions under which plants are planted. Therefore, in order to increase the permeability and to enable the growth of the plant, it must be adjusted in consideration of the proportion of the aggregates having a fine particle size and a coarse particle size. Since crushed stone is generally used for road pavement, since it contains a considerable amount of fine sand having a condition outside of the nominal particle size range, when it is used as aggregate in the present invention, the overall ratio of aggregates is determined or the crushed stone is washed in advance. It is required to remove sand of the above fine particle size in advance. In addition, the value close to the upper limit in the particle size range of the aggregate, which is limited to the percentage of passage through the sieve, mainly determines the strength of the concrete construction.

In addition to the above-mentioned mixture, the porous concrete may optionally contain 1 to 40 kg / m ³ of a mixture, an AE reducing agent, a fluidizing agent, and an SBR latex rubber.

As the admixture, any binder commonly known for addition to cement mortar can be used. For example, natural or synthetic rubbers such as SBR, NBR, acrylic resins, epoxy resins, and the like can be used, and these binders can also be usually added as an emulsion.

Permeable concrete constructs provided by blending ratios that meet the specific conditions of the mixtures above have a sufficient bending strength of 20 to 30 kg / cm ² over time that accumulates with a permeability coefficient of at least 10 ^-1 cm / sec order. And, it can represent a compressive strength of 100 ~ 300kg / cm ² .

A feature that enables the coefficient of permeability of the porous concrete construction applied to the present invention is that a porosity of 10 to 30% can be obtained.

While the construction by the porous concrete exhibits such a large porosity and permeability as described above, providing sufficient bending strength of 20kg / cm ² or more and compressive strength of 100-300kg / cm ² to withstand the site conditions after completion of construction is described above. By a mixing ratio.

The method for constructing a stream using such porous concrete is to be constructed by using a fork crane or a slope conveyor at the site of the concrete mixed with a ready-mixed concrete manufacturing plant or a mobile mixer according to the mixing ratio of the above composition. A porous concrete construct is provided by laying directly in position and then completing a flattening and compacting operation, followed by curing for a period of time after the compacting operation.

This flattening and compacting operation uses a four-sided wrapping cylinder finisher.

In the construction method using the porous concrete of the present invention, applying a cylinder finisher is a characteristic construction method, which can be said to be a breakthrough as compared to the construction of the slope slope of the river using the porous concrete.

In general, it is considered that construction of permeable concrete that requires a compaction process is impossible for sloped surfaces. This uses a finisher when flattening the laid concrete. The finisher has no problem in leveling and compacting when the road surface of a general road is a slope, but at a certain angle or more, that is, on a slope of a river. There is a limit that can not be compacted. For this reason, the construction method of the porous concrete provided for the river revetment has not been proposed until now.

By using the present invention, a cylinder finisher in which a roller is formed on the finisher to allow construction on an inclined plane is used. The cylinder finisher can perform the flattening and compacting of the package on the inclined surface having a constant inclination angle as is known. In the case of the porous concrete of the present invention, after the installation, the compacting process must be performed with a roller or a voltmeter after installation. It is necessary to cure it to maintain the required strength, but in the case of inclined surface after flat laying, general equipment such as tandem roller or compactor cannot be used, and in general, it is difficult to install on the slope as follows. The construction method is installed on the inclined surface. The construction method comprises the steps of evenly sloping the inclined surface of the river lake with equipment such as a fork lane; Covering the nonwoven fabric on the inclined surface to prevent the outflow of soil and subsidence; Securing a retaining member of wood of the same width as the packing thickness to prevent shrinkage and expansion; Installing a rail to allow the finisher to move simultaneously at the top and the bottom of the lake; Mounting a cylinder finisher with a screw and a roller on the upper and lower rails of the lake, and performing mechanical adjustment to maintain a uniform packing thickness; Transporting the porous concrete produced by the above composition to a fork crane or a slope conveyor, laying it flat and compacting it with an attached roller; In addition, in the construction of the present invention, since the cylinder finisher has been used for laying concrete in plain or river, the person having ordinary knowledge in the same industry It will be appreciated how the porous concrete produced by the present invention is constructed by a cylinder finisher.

The present invention can provide a porous concrete pavement that can be planted while giving excellent permeability and strength to the river's lakes and slopes by blending the water-permeable concrete mixture in an optimal state, so that Compared to the block, construction can be done at low cost, and there is no gap like the connection part of the block, preventing the loss of the levee, and providing an environment where plants can be settled and grown while growing artificially. There is an effect to protect the environment and ecosystem even if the construction.

Claims (4)

Portland cement with 300-400 kg / m ³ per m ³ ; 100-200 kg / m ³ of water; Single-grain aggregates with a maximum dimension of 25 to 13 mm, coarse aggregates of 13 mm sieve with no more than 1 to 20 wt% of coarse aggregate, 100% by weight of 5 mm sieve with gross weight, 1.2 mm the passage of body weight percentage of 1 to 15% by weight fine aggregate is 5mm or less, the entire goljaeryang 5-20% by weight of a 1200 ~ 2100kg / m ³ which is of the aggregate and the; Construction of porous concrete for use on river banks and surface, characterized in that the known porous concrete mixture composed of admixture of 1 ~ 40kg / m ³ is laid on the sloped surface of the river and then hardened by flattening and compacting using a cylinder finisher. Way. delete delete delete