JP2013253472A - Construction method of concrete dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately cure mortar and concrete while transporting the mortar and the concrete from a concrete manufacturing facility to a site, and in the installation work of the mortar and the concrete on the site, in construction of a concrete dam, and to eliminate the need of installation work and removal work of atomization means.SOLUTION: Atomization means 2 for atomizing water particles is provided respectively in a transfer car, a cable crane, a ground hopper, a dump truck, a bulldozer, a vibration compaction machine, a vibration joint cutter, and a wheel loader that are a machine 1 to be used when constructing a concrete dam. During the operation of the respective machines, the atomization means of the respective machines is operated to attain the state of lowering a temperature in the atmosphere around the respective machines and increasing humidity in the atmosphere around the respective machines, and the concrete dam is constructed.

Description

  The present invention relates to a concrete dam construction method, and more particularly, to mortar or concrete curing at the time of concrete dam construction.

In general, when concrete dams are constructed, the concrete is required to have sufficient strength and water to prevent initial defects such as cracks by watering the concrete, such as by spraying the surface of the concrete. It is known. In particular, initial curing is important in the summer because initial drying and the like become prominent.
Further, water particles of approximately 100 μm or 100 μm or less are sprayed on the top surface of the placed concrete or the concrete being placed so that the placed concrete or the concrete being placed is cured in a humid atmosphere. A concrete construction method is known (for example, see Patent Document 1).

Japanese Patent No. 2854218

In the concrete construction method described above, water particles having a size of about 100 μm or 100 μm or less are sprayed using a stationary spraying means.
Therefore, the concrete being transported cannot be cured while transporting the concrete from the concrete production facility to the site.
Also, when mortar and concrete are cured in mortar and concrete placement work on site, a support mechanism such as a support column and a pedestal for supporting the spray path such as a spray nozzle and a hose is required. Must be embedded in concrete. In addition, a work platform must be formed by hanging a tread on the formwork. In addition, a place to install the compressor must be secured. Therefore, the installation work of the spray means becomes difficult. In addition, it is necessary to remove the spraying means after finishing the concrete construction.
In addition, when concrete is transferred for each lift (a part where concrete is placed continuously in one block) as in the construction of a concrete dam, the pedestal is not embedded in the concrete. It is necessary to install a support mechanism for supporting the spray path around the lift to be driven. Therefore, for each lift, a replacement work of the support mechanism (that is, an installation work and a removal work of the support mechanism), and an installation work and a removal work of the spray passage and the compressor associated therewith are required. That is, even when a concrete dam is constructed using conventional stationary spraying means, installation work and removal work of the spraying means are difficult.
Therefore, the present invention can appropriately cure mortar and concrete while transporting mortar and concrete from the concrete production facility to the site in the construction of the concrete dam, and in placing mortar and concrete on site. In addition, it is an object of the present invention to make it unnecessary to install and remove spraying means when curing mortar and concrete in mortar and concrete placing work on site.

  A concrete dam construction method according to the present invention includes a water storage tank, a spray nozzle portion, a pump in which a suction port is connected to a water outlet of the water storage tank, and a discharge port is connected to a water inlet of the spray nozzle portion. A sprayer that sprays water particles when the pump is driven by a pump is used when constructing a concrete dam, a transfer car, a cable crane, a ground hopper, a dump truck, a bulldozer, Installed in the vibration compactor, vibration jointer, and wheel loader respectively, concrete and mortar are put into the concrete bucket from the concrete manufacturing equipment, and this concrete bucket drives the transferer running on the bunker line and sprays the transferer By means of spraying by means of spraying. A step of transporting a concrete bucket containing concrete and mortar to the position where the cable crane is suspended with the temperature in the atmosphere surrounding the furka lowered and the humidity in the atmosphere raised, and driving the cable crane and the cable crane The step of transporting the concrete bucket to the ground hopper while lowering the temperature in the atmosphere around the concrete bucket suspended by the cable crane and raising the humidity in the atmosphere, and the spraying means of the ground hopper Putting concrete and mortar in the concrete bucket into the ground hopper, lowering the temperature in the atmosphere around the ground hopper and increasing the humidity in the atmosphere, and the concrete from the ground hopper When the dump truck loaded with mortar is transported from the ground hopper to the site and when concrete or mortar is slid down on the site, the temperature of the ambient atmosphere around the dump truck is activated. When the concrete and mortar dropped from the dump truck to the installation site are spread with the bulldozer, the spraying means of the bulldozer is activated and the surroundings of the bulldozer The step of lowering the temperature in the atmosphere and increasing the humidity in the atmosphere, and when compacting the spread concrete with the vibration compactor, the spraying means of the vibration compactor is activated to vibration compaction Reduce the temperature in the atmosphere around the machine and increase the humidity in the atmosphere, When cutting the concrete with a vibration joint cutting machine, the spray means of the vibration joint cutting machine is operated to lower the temperature in the atmosphere around the vibration joint cutting machine and to increase the humidity in the atmosphere. And when the mortar is spread on the concrete with the wheel loader, the spraying means of the wheel loader is operated to lower the temperature in the atmosphere around the wheel loader and to increase the humidity in the atmosphere. It is characterized by that.

  According to the concrete dam construction method of the present invention, at the time of concrete dam construction, the ambient temperature can be lowered and the relative humidity can be raised by the liquid sprayed when carrying or placing mortar or concrete. Therefore, it is possible to construct a concrete dam that can secure the required strength of concrete and mortar and prevent initial defects such as cracks, and the installation work and removal work of spraying means can be made unnecessary.

The figure which shows the structure of a machine (embodiment). The figure which shows the vibration compaction machine as a machine (embodiment). Sectional drawing of spray nozzle part (embodiment).

  1 to 3 show an embodiment, FIG. 1 shows a machine equipped with spraying means, FIG. 2 shows a vibration compactor as a machine equipped with spraying means, and FIG. 3 shows a cross section of the spray nozzle part. Show.

  As shown in FIG. 1; FIG. 2, the machine 1 includes spray means 2. The spray means 2 includes a column 3, a spray nozzle unit 4, a water storage tank 5, a pump 6, a compressor 7, a water supply hose 8, a compressed air supply hose 9, a compressor and a pump drive power source 10. The support | pillar 3 is provided in the roof of a machine, for example, a loading platform. The water storage tank 5, the pump 6, the compressor 7, and the drive power supply 10 are mounted on the machine 1, for example. The drive power supply 10 uses a battery of the machine 1 or a generator mounted on the machine 1. Reference numeral 39 denotes an open / close valve.

  As the spray nozzle unit 4, a spray nozzle having a structure capable of spraying water particles (liquid particles) of 100 μm or less is used. For example, what is called a two-fluid nozzle as shown in FIG. 3 (a); FIG. 3 (b) is used.

  The spray nozzle unit 4 shown in FIG. 3A has a casing 20 with a water introduction port 11, a compressed air introduction port 12, a water injection port 13, a compressed air injection port 14, a water introduction port 11 and a water injection port 13. It is the structure provided with the air guide path 16 which connects the water conduit 15 connected, the compressed air inlet 12, and the compressed air injection port 14. The spray nozzle section 4 includes a one-end opening water pipe 18 formed by the water guide path 15 and the water injection port 13, and a one-end opening air pipe path 19 formed by the air guide path 16 and the compressed air injection port 14. The casing 20 is formed. That is, the one-end open water pipeline 18 is provided inside the one-end open trachea channel 19, and the one-end open water pipeline 18 and the one-end open trachea channel 19 are provided coaxially. The spray nozzle unit 4 is configured to realize water atomization spray by intensively applying a high-speed air flow to the liquid film formed at the water injection port 13.

  The spray nozzle unit 4 shown in FIG. 3B has a configuration in which a casing 20 includes a water introduction port 11, a compressed air introduction port 12, a mixing unit 21, and an injection port 22. That is, the water atomization spray is realized by mixing the water introduced from the water introduction port 11 and the compressed air introduced from the compressed air introduction port 12 in the mixing unit 21.

  In the spray nozzle portion 4 shown in FIG. 3A; FIG. 3B, the water inlet 11 and the compressed air inlet 12 are individually provided in the casing 20. The spray nozzle unit 4 may have a spray angle range of about 15 °, for example. 2 indicates water particles sprayed from the spray nozzle unit 4.

  The water outlet 31 of the water storage tank 5 and the suction port 32 of the pump 6 are connected by a connection hose 33, and the discharge port 34 of the pump 6 and the water introduction port 11 of the spray nozzle part 4 are connected by a water supply hose 35. The compressed air discharge port 36 of the compressor 7 and the compressed air introduction port 12 of the spray nozzle unit 4 are connected by a compressed air supply hose 37.

  In the spraying means 2 having the above configuration, when the drive power supply 10 is turned on and the compressor 7 and the pump 6 are driven, the spray nozzle unit 4 sprays water particles of 100 μm or less.

  When constructing a concrete dam, the machine 1 is driven by mortar or concrete produced by a concrete production facility such as a transfer car, bucket carriage, belt conveyor, concrete bucket, cable crane, ground hopper, dump truck, etc. Used for transporting mortar or concrete on site such as bulldozers, vibration compactors, vibration jointing machines, wheel loaders, backhoes, etc. There are machines for driving work.

  For example, as shown in FIG. 2, a column 3 is attached to the arm or rear of the vibration compactor, and a compressor 7, a water storage tank 5, and a pump 6 are mounted on the body of the vibration compactor. The spray nozzle part 4 is fixed to the tip part of the column 3. The water supply hose 8 and the compressed air supply hose 9 may be connected to the spray nozzle unit 4 in advance or may be retrofitted to the spray nozzle unit 4 fixed to the tip of the support column 3.

  An example of a concrete dam construction method using the machine 1 will be described. The concrete dam construction sequence is as follows. First, concrete or mortar is put into a concrete bucket from a concrete manufacturing facility, and this concrete bucket is transported to the suspension position of the cable crane by a transport facility such as a transfer car that runs on a bunker line. Is done. The concrete bucket is moved to the ground hopper by the cable crane, and concrete and mortar in the concrete bucket are put into the ground hopper. Concrete and mortar are loaded from the ground hopper onto the dump truck bed. Concrete and mortar are transported to the placement site by a dump truck and lowered to the placement site. For example, concrete that has been lowered to the placement site is leveled by a bulldozer, and concrete is placed for one lift. The leveled concrete is compacted with a vibration compactor. The compacted concrete layer for one lift is jointed with a vibration jointer. This joint cutting is performed in order to prevent cracks from occurring in the concrete layer. Then, after the mortar is spread on the concrete with a wheel loader, the above-described series of operations are repeated on the spread mortar to place the next layer of concrete. A concrete dam is constructed by repeating such placement work.

  In the construction method described above, for example, the transferer is driven and the spraying means 2 provided on the transferer is operated, and the temperature in the atmosphere around the transferer is lowered and the humidity in the atmosphere is reduced by spraying by the spraying means 2. In the raised state, carry the concrete bucket containing concrete and mortar to the position where the cable crane is suspended. Drive the cable crane and activate the spraying means 2 to lower the temperature in the atmosphere around the concrete bucket suspended by the cable crane and raise the humidity in the atmosphere from the concrete production facility to the ground hopper Carry. The spraying means 2 is also operated in the ground hopper so that the temperature in the atmosphere around the ground hopper is lowered and the humidity in the atmosphere is raised. The dump truck loaded with concrete and mortar from the ground hopper is operated during the transportation from the ground hopper to the setting site and when the concrete and mortar slide down to the setting site, Reduce the temperature in the atmosphere and increase the humidity in the atmosphere. The bulldozer spraying means 2 is actuated when laying and leveling concrete or mortar dropped at the site of placement with a bulldozer to lower the temperature in the atmosphere around the bulldozer and raise the humidity in the atmosphere. When compacting the leveled concrete with a vibration compactor, the spraying means 2 of the vibration compactor is actuated to lower the temperature in the atmosphere around the vibration compactor and increase the humidity in the atmosphere. And When jointing the compacted concrete with a vibration joint cutting machine, the spraying means 2 of the vibration joint cutting machine is operated to lower the temperature in the atmosphere around the vibration joint cutting machine and increase the humidity in the atmosphere. State. When the mortar is spread on the concrete with the wheel loader, the spraying means 2 of the wheel loader is operated to lower the temperature in the atmosphere around the wheel loader and increase the humidity in the atmosphere.

The state in which the temperature in the atmosphere is lowered and the humidity in the atmosphere is increased is, for example, in summer, the temperature in the atmosphere environment is lowered by 1 ° C. to 5 ° C. from the outside temperature, and the humidity in the atmosphere environment is reduced to the atmosphere environment This refers to a state where the humidity is raised by 1% to 10% from the outside humidity.
That is, when transporting or placing mortar or concrete, water is sprayed by the spray means 2 mounted on the machine 1 to lower the temperature in the atmosphere environment by 1 ° C. to 5 ° C. from the outside temperature, and the atmosphere By setting the humidity in the environment to 1% to 10% higher than the humidity outside the atmospheric environment, the concrete and mortar are properly cured.

As described above, in the embodiment, the transporting machine 1 used for transporting the mortar or concrete manufactured in the concrete manufacturing facility to the placing site, and the mortar or concrete placing work on the placing site. The spraying means is mounted on the machine 1 for placing work used for spraying, and water is sprayed by the spraying means 2 mounted on the machine 1 when transporting concrete or mortar and placing concrete or mortar. By doing so, concrete and mortar can be properly cured.
That is, according to the curing method for concrete and mortar according to the embodiment, the temperature in the atmosphere where the concrete and mortar are placed from the concrete production equipment to the end of placing can be lowered and the humidity in the atmosphere can be raised. In addition, the required strength of concrete and mortar can be secured and initial defects such as cracks can be prevented.
Since the machine 1 is equipped with the spraying means 2, the spraying means 2 is installed or removed by the movement of the machine 1, so that the installation work and the removal work of the spraying means 2 are not necessary. .
Furthermore, since the spraying means 2 has a structure for spraying water particles of 100 μm or less, since the sprayed water particles of 100 μm or less are vaporized, it is possible to prevent the strength of the mortar or concrete from being reduced by water addition. . In addition, the operator can be prevented from getting wet and workability can be prevented from being lowered.

A spraying means for spraying water particles of 100 μm or more may be used as long as it does not adversely affect concrete or mortar during transportation and placement.
A plurality of spray nozzles may be used together.
You may use the spray means of the structure provided with the structure which does not mix the compressed air by a compressor, ie, the spray nozzle part called the 1 fluid nozzle sprayed with the hydraulic pressure of a pump.
The installation position of the spray means with respect to the machine is not limited.
The compressor and the pump may be operated by turning on a dedicated start switch or may be operated in conjunction with the engine start of the machine.
You may spray the liquid other than water, for example, the aqueous solution which melt | dissolved the substance in water by the spraying means.

  1 machine, 2 spraying means, 4 spray nozzle part.

Claims (1)

A water storage tank, a spray nozzle part, and a pump in which a suction port is connected to a water outlet of the water storage tank and a discharge port is connected to a water inlet of the spray nozzle part. The transfer means, cable crane, ground hopper, dump truck, bulldozer, vibration compacting machine, vibration jointing machine, foil loader, which are the machines used when the concrete dam is constructed with the spraying means that sprays water particles in the nozzle part Respectively,
Concrete or mortar is put into a concrete bucket from a concrete production facility, and this concrete bucket drives a transferer that travels on a bunker line and activates the spraying means of the transferer. Lowering the temperature in the atmosphere and raising the humidity in the atmosphere to carry a concrete bucket containing concrete and mortar to the hanging position of the cable crane,
Drive the cable crane and actuate the spraying means of the cable crane to lower the temperature in the atmosphere around the concrete bucket suspended by the cable crane and carry the concrete bucket to the ground hopper with the humidity in the atmosphere raised. Steps,
Actuating the spraying means of the ground hopper, lowering the temperature in the atmosphere around the ground hopper and increasing the humidity in the atmosphere, and putting the concrete bucket mortar and mortar into the ground hopper;
When a dump truck loaded with concrete or mortar from the ground hopper is transported from the ground hopper to the installation site or when sliding concrete or mortar down on the installation site, the dump truck spraying means is activated to Reducing the temperature in the surrounding atmosphere and increasing the humidity in the atmosphere; and
When the concrete or mortar dropped from the dump truck to the installation site is spread with a bulldozer, the spraying means of the bulldozer is activated, the temperature in the atmosphere around the bulldozer is lowered and the humidity in the atmosphere is raised. And steps to
When compacting the leveled concrete with a vibration compactor, the spraying means of the vibration compactor is activated to lower the temperature in the atmosphere around the vibration compactor and increase the humidity in the atmosphere. And steps to
When the compacted concrete is jointed with a vibration jointing machine, the spraying means of the vibration jointing machine is activated to lower the temperature in the atmosphere around the vibration jointing machine and increase the humidity in the atmosphere. And steps
When laying and leveling mortar on concrete with a foil loader, operating the spraying means of the wheel loader to lower the temperature in the atmosphere around the wheel loader and increase the humidity in the atmosphere; and
A concrete dam construction method characterized by comprising

Images