JP4677622B2 - Conveying method of mortar and concrete to the construction site of dam body - Google Patents

Description

  The present invention is directed to a dam pedestrian construction site that transports mortar and concrete produced in a batcher plant installed at a height higher than the top of the dam pedestal when completed. Mortar and concrete transport method. In this specification, mortar means a material obtained by kneading cement, fine aggregate and water, and concrete means a material obtained by kneading cement, coarse aggregate, fine aggregate and water.

  When constructing the dam body, it is repeated to place mortar and then place concrete on it. The mortar functions as an adhesive that joins the previously placed concrete and the concrete placed thereon. In addition, the area where the concrete is to be placed is extremely large, and it is not possible to place concrete on this large area at once. Therefore, a large area is divided into a plurality of regions, and mortar placing and concrete placing are sequentially performed in these regions.

  Here, as a method for transporting mortar and concrete to the construction site of a dam body, the one described in Patent Document 1 is conventionally known. In this, the concrete manufactured in the batcher plant is transported to the dam basin construction site by the belt conveyor, and the mortar material is transported to the dam basin construction site without adding water by this belt conveyor. Yes. Then, mortar is manufactured by adding water to the mortar material by a mortar manufacturing facility installed at the site where the dam body is built.

  Mortar has high fluidity, and when it is conveyed by a belt conveyor, the mortar easily leaks from the belt conveyor during conveyance. For this reason, in the above conventional example, the mortar material is conveyed without adding water, but the mortar material may be blown off from the belt conveyor by wind or the like, and the conveyance efficiency is not necessarily improved.

  In addition, conventionally, cranes such as tawa cranes and cable cranes have been used as the transportation equipment, and the concrete manufactured in the batcher plant is transported to the construction site of the dam dam with the crane loaded in a bucket suspended by the crane. Are known. According to this, compared with what uses a belt conveyor, there is no dripping of the concrete during conveyance, and conveyance efficiency improves. And mortar is manufactured in a batcher plant, and this mortar is also conveyed to the construction site of a dam body by a crane.

  However, if concrete and mortar are transported by a common crane, concrete cannot be transported during mortar transport. As described above, a large area is divided into a plurality of areas, and mortar is placed in order in these areas. In the construction of a dam pier that performs concrete placement, the construction efficiency is deteriorated. In addition, in order for the mortar to function as an adhesive, it is necessary to cast concrete on it as soon as possible after placing the mortar, but when transporting concrete and mortar with a common crane, after transporting the mortar The steps of returning the bucket, loading concrete, and transporting to the pouring position occur, and during that time, the concrete is put on standby, and during this waiting time, the mortar hardens and the function as an adhesive deteriorates. .

In order to solve such a problem, it is conceivable to transport the mortar with a crane other than the concrete transport crane, but this still causes the following problems. That is, when the mortar is loaded on a bucket that is suspended by a crane, the mortar has high fluidity, so that the mortar is likely to hang down from the opening / closing port at the bottom of the bucket during conveyance. Therefore, the mortar cannot be efficiently transported to the dam body construction site.
JP 2000-290968 A

  This invention makes it the subject to provide the conveying method which enabled it to convey mortar and concrete efficiently to the construction site of a dam body in view of the above point.

  In order to solve the above-mentioned problems, the present invention conveys mortar and concrete produced in a batcher plant installed at a height higher than the top of the dam pier at the time of completion to the dam pier construction site. The concrete is transported to the dam foundation construction site while being loaded in a bucket, and the mortar is transported to the dam foundation construction site via a pipeline.

  According to the present invention, since concrete and mortar are transported in different systems, a wide area is divided into a plurality of regions, and the creation of a dam levee that performs mortar placement and concrete placement in order in these regions is efficiently performed. In addition, the concrete can be quickly placed on the mortar after the mortar is placed, and the quality can be maintained. Furthermore, in the present invention, by using a pipeline for transporting mortar, the mortar can be efficiently transported to the dam laying site without dripping down. In addition, since concrete has low fluidity, clogging occurs when the concrete is conveyed by a pipeline. Therefore, concrete is transported in a state of being loaded in a bucket.

  Further, in the present invention, a hopper for storing concrete is installed at the dam foundation construction site, the concrete is thrown into the hopper from the bucket, and the concrete is loaded from the hopper onto the dump truck, and the concrete at the dam foundation construction site. It is desirable to transport the mortar from the pipeline to the mixer truck and transport it to the mortar placement site at the dam laying site while transporting it to the placement site. According to this, since the concrete is stored in the hopper, the concrete can be loaded onto the dump truck at any time without waiting for the transport of the next concrete from the batcher plant and transported to the concrete placement site, thereby improving the work efficiency. be able to. Moreover, a mortar is kept in a favorable state by loading and stirring a mortar in a mixer truck. Then, when necessary, the mortar can be conveyed immediately to the mortar placement site.

Referring to FIG. 1, reference numeral 1 denotes a dam body being constructed. The dam body 1 is constructed by repeatedly placing mortar in a plurality of regions and placing concrete thereon. Produce concrete by mixing cement, sand, gravel, and other aggregates and water at a required ratio at a location higher than the top of the completed dam dam body, adjacent to the construction site of dam levee 1 first and batcher plant 2 _1, cement, sand and water were kneaded at a required proportion of the second batcher plant 2 ₂ for producing a mortar is installed.

Concrete produced in the first batcher plant 2 ₁ is conveyed to the reclamation site dam 1 by a cable crane 4 while embarked in the bucket 3. The bucket 3 is suspended by a transverse trolley 5 of the cable crane 4. Then, the bucket yard 6 provided on the first side of the batcher plant 2 ₁ while placing the bucket 3, the concrete produced by the first batcher plant 2 ₁ via the belt conveyor 7 and the chute 8 The bucket 3 is loaded.

  A hopper 9 for storing concrete is installed at the construction site of the dam body 1. When the loading of concrete into the bucket 3 at the bucket yard 6 is completed, the bucket 3 is lifted from the bucket yard 6 and moved to a position directly above the hopper 9 as indicated by a virtual line in FIG. Next, the opening / closing port at the bottom of the bucket 3 is opened, and concrete is put into the hopper 9. Then, the concrete is loaded from the hopper 9 onto the dump truck 10 and conveyed to the concrete placement site at the construction site of the dam dam 1.

In this way by installing a hopper 9 to the reclamation site of the dam Hisagetai 1, Once you have this in storing the concrete, dump at any time concrete without waiting for the transport of the next concrete from the first Batcher plant 2 ₁ It can be loaded onto the truck 10 and transported to the concrete placement site, and work efficiency can be improved.

Mortar produced in the second batcher plant 2 ₂ is conveyed to the reclamation site dam Hisagetai 1 by a pipe line 11. An agitator tank 12 that stores the mortar while stirring is provided at the beginning of the pipeline 11. Then, and so as to put into the agitator tank 12 mortar produced in the second batcher plant 2 ₂ via a chute 13.

  The mortar in the agitator tank 12 is sent to the pipeline 11 by the pump 14. Here, the pipeline 11 is divided into a pumping section 11a (a section having a downward slope of less than 35 °) by the pump 14 and a free flowing section 11b (a section having a downward slope of 35 ° or more). In the case of a downward gradient transfer, if the pressure transfer is performed, the cement, sand, and kneaded water are separated, and the quality may be deteriorated. For this reason, it is desirable to make the pumping section 11a as short as possible.

  Further, in the free flow section 11b, the flow rate of the mortar is increased by gravity, and a full pipe portion where the pipe cross section is filled with the mortar and a portion including an air layer can be formed. During long-distance flow, the mortar is subjected to pressure fluctuations due to changes in the volume of the air layer, and the workability is greatly reduced. Therefore, in the present embodiment, compressed air from the compressor 15 is introduced into the starting end portion of the free flowing section 11b of the pipeline 11. According to this, the space where air flows by the pressure of compressed air is formed in the section upper part of pipeline 11, and the generation of a full pipe part is controlled. As a result, the air layer continues without being blocked by the full pipe portion, and the volume change of the air layer does not occur, so that the workability of the mortar is prevented from being lowered.

  In addition, since the mortar has high fluidity, if the mortar is loaded in the bucket 3 and transported, the mortar drips from the opening / closing port at the bottom of the bucket 3 during transport. On the other hand, if the pipeline 11 is used for transporting mortar as in the present embodiment, the mortar can be transported to the construction site of the dam dam 1 without dripping down, and transport efficiency is improved.

  The mortar conveyed by the pipeline 11 is loaded on the mixer truck 16 at the end of the pipeline 11. The mixer truck 16 waits in a full tank state while stirring the mortar so that the mortar is kept in a good state, and immediately, when necessary, mortar placement at the construction site of the dam levee 1 Transport mortar to the place.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, the cable crane 4 is used as a transport facility for transferring the bucket 3 into which concrete is loaded. It is also possible to use it. In the above embodiment, it is provided with the second batcher plant 2 ₂ of the first batcher plant 2 ₁ and mortar dedicated concrete only, also be produced and concrete and mortar in one batcher plant Is possible.

Explanatory drawing which shows an example of the conveyance equipment used for implementation of the method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dam body, 2 ₁ , 2 ₂ ... Batcher plant, 3 ... Bucket, 4 ... Cable crane, 9 ... Hopper, 10 ... Dump truck, 11 ... Pipeline, 16 ... Mixer car.

Claims (2)

A method of transporting mortar and concrete produced at a batcher plant installed at a location higher than the top of the dam dam at the time of completion to the construction site of the dam pier,
Concrete is transported to the dam laying site while being loaded in a bucket,
A method for transporting mortar and concrete to a dam foundation construction site, wherein the mortar is transported to a dam foundation construction site through a pipeline. Install a hopper for storing concrete at the dam foundation construction site, put the concrete from the bucket into the hopper, load the concrete from the hopper onto the dump truck, and transport it to the concrete placement site of the dam foundation construction site With
2. The method for transporting mortar and concrete to a dam foundation construction site according to claim 1, wherein the mortar is loaded into a mixer truck from a pipeline and transported to a mortar placement site of the dam foundation construction site.

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