JP4537343B2 - Form for shoulder - Google Patents

Description

  The present invention relates to a mold for reinforcing and compacting a shoulder such as a trapezoidal CSG dam and a method for compacting a shoulder using the mold.

  When constructing trapezoidal dams (weirs, dikes, levee bodies), the construction method called CSG (Cemented Sand and Gravel in-situ concrete) method reduces the cost of collecting aggregates and materials, saving labor, shortening the construction period It is implemented to reduce the environmental load.

  This CSG method uses locally generated materials including rock blocks and earth and sand collected at construction sites as the aggregates at dam construction sites, etc., and mixes them with cement and water. By using it, it is intended to reduce transportation costs and material costs such as aggregates, save labor, shorten the construction period, and reduce the environmental burden.

  In this construction method, as described above, locally generated materials, cement and water are mixed at a predetermined blending amount to produce CSG and carried to the construction site. After carrying in, CSG is spread and leveled using vibration rollers, etc. Compress and compact. These steps are repeated to build up a desired trapezoidal structure by stacking them stepwise (layered) to increase the height.

  The spread leveling step is intended to stir the mixed material separated during transportation and carry-in to make it into a homogeneous state and to perform the rolling work effectively by leveling the level. In other words, component separation tends to occur when it is put into a mold by a dump truck, and when the spreading thickness is increased, only a component corresponding to a coarse aggregate such as cobblestone is solidified and rolled. However, there is a possibility that the cement-based solidified material may not be filled in the gaps between the coarse aggregates. For this reason, a leveling test is performed to obtain an appropriate leveling thickness to eliminate material separation.

  In the rolling step, the CSG is compacted by compaction due to the weight of the vibration roller, reduction of friction between the aggregates due to vibration, and flow of the cement-based solidification material.

By the way, when the upper surface is compacted by the vibration operation in this way, the slope may be deformed and collapsed. Therefore, in order to eliminate such inconvenience, conventionally, for example, a wire mesh formwork is set and an H-shaped steel is installed outside thereof to suppress deformation of the wire mesh, or the H-shaped steel is stacked as a formwork. (For example, refer to Patent Document 1).
JP 2004-225453 A

  In order to prevent the shoulder from collapsing, in the method of stacking the H-shaped steel, the only way to adjust the weight is to adjust the number of stacks. For example, it is difficult to stack two or more stages, it is difficult to adjust the weight freely, and it is difficult to sufficiently support the shoulder.

  In addition, since the H-shaped steel is installed in each layer, the H-shaped steel cannot be newly installed in the upper layer unless the lower-layer concrete is completely solidified, which takes time.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and even if the shoulder portion is compacted using a large vibration roller, the shoulder portion does not collapse and can support a plurality of shoulders simultaneously. It is an object of the present invention to provide a shoulder-shoulder mold that can efficiently reinforce and compact a shoulder and to improve workability, and a method for compacting a shoulder using the same.

  The present invention achieves the above-mentioned object, and the invention according to claim 1 is a mold for a shoulder used in a construction method for constructing a shoulder in a step shape, and includes a plurality of frames having a square cross section. It is connected in a stepped manner, and the gist is that the hollow interior of the frame body is filled with water for weight adjustment.

  According to the first aspect of the present invention, since the plurality of frames are connected in a stepped manner, a plurality of shoulders can be protected at the same time, and workability is improved. In addition, because the inside of the frame can be filled with water, the weight of the mold can be easily adjusted, and even if it is compacted using a large vibration roller, the mold can be formed with a large weight. Therefore, the shoulder can be protected reliably. When moving the mold, if the water inside is removed, the weight becomes light and the movement becomes easy.

  The gist of the invention described in claim 2 is that a water supply port and an air vent hole are provided in the upper portion of the frame body, and a drain port is provided in the side portion.

  According to the second aspect of the present invention, the weight adjustment of the frame can be freely adjusted by the amount of water supplied from the upper water supply port and the amount of water discharged from the water discharge port, and can be flexibly dealt with in accordance with the construction site. .

  The gist of the invention described in claim 3 is that the upper and lower frames are connected to the upper side surface portion and the lower upper surface portion by an L-shaped connecting material.

  According to the third aspect of the present invention, since the upper and lower frame bodies are coupled by the L-shaped connecting material, the mold frame can be formed in a stepped shape with a simple structure.

  The gist of the invention described in claim 4 is that the frame body is provided with a lifting tool that can be lifted in an integrated state of the frame bodies connected in a stepped shape.

  According to the fourth aspect of the present invention, since the staircase-shaped formwork can be lifted as a single object simply by lifting it with a lifting tool, simultaneous protection of multiple shoulders can be easily performed, and the staircase is raised in a staircase shape. The progress of the process can be accelerated and the workability is improved.

  The invention according to claim 5 is a construction method in which a plurality of step-shaped frame bodies connected in a step-like manner are installed at a plurality of shoulder positions, and the upper shoulder is compacted. The gist is to fold up the step-like formwork one step at a time.

  According to the fifth aspect of the present invention, the shoulder can be protected simultaneously in a plurality of steps, and at the same time, the upward movement of the formwork is performed in one step, so that the time for protecting the shoulder can be secured for a long time. Is certain. In addition, the mold can be moved easily and efficiently because a plurality of frames are moved in a set of a plurality of stages.

  As described above, the method for compacting the shoulder of the present invention and the method of compacting the shoulder using the mold according to the present invention is suitable for the situation in the field even if the shoulder is compacted using a large vibration roller. Corresponding heavy formwork can be used, so that the shoulder can be reliably protected and there is no risk of collapse, and multiple shoulders can be supported simultaneously, so the shoulder can be reinforced and compacted efficiently. It can be performed well and the workability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a mold for shoulders of the present invention, FIG. 2 is a side view of a trapezoidal CSG dam, and the mold 1 of the present invention is a trapezoidal CSG dam 8 formed in a staircase shape in the CSG method. In order to reinforce and compact the shoulders of the above, a plurality of square steel frames 1a having a square cross section, two in the illustrated example, are arranged in a step shape, and the upper frame 1a The side surface on the front side and the upper surface of the lower frame 1a were connected with an L-shaped connecting member 2 at an appropriate interval, and connected in a staircase pattern.

  Each frame 1 is provided with, for example, a water supply port 3 at one end portion of the upper surface, an air vent hole 4 at the other end, and a drain port 5 at a side portion on the front side.

  Further, a plurality of hook-shaped suspensions 6 were attached to the upper surface of the frame 1a at appropriate intervals.

  Next, a method for constructing a trapezoidal CSG dam (weir, levee, levee body) by stacking in-situ concrete into a layered trapezoid by the CSG method using such a mold 1 will be described. The formwork 1 of the present invention is installed around the place where the concrete is put in-situ, and CSG and concrete etc. are thrown into the inside and stacked in layers. The formwork 1 is installed in a staircase shape on each shoulder with the CSG and concrete layers. The mold 1 installed in a staircase shape is further connected to the horizontal linear direction by a connecting material 11 for a required length.

  At this time, an L-shaped wire mesh / expanded metal 10 and the like are laid simultaneously over the inside of the form 1 to be placed on the side where CSG and concrete are placed and the horizontal direction extending from the inside to the inside.

  In this state, each frame 1a is positioned on the upper and lower shoulders, and water is injected into the hollow interior of the frame 1a from the water supply port 3 and filled with water 9. The amount of water supply is determined according to the conditions at the site. For example, if the total weight of the two-stage frame 1a and water is 800 kg or more, it can be handled.

  In addition, when water 9 is injected into the inside, the water 9 can be smoothly injected by opening the air vent hole 4.

  Then, the upper surface of the upper layer of CSG and concrete placed this time is compacted with a large vibration roller 7 or the like. At this time, a large rolling pressure is applied to the upper CSG, concrete, etc., but since the shoulder is protected by the mold 1, there is no possibility that the shoulder will collapse.

  When the upper layer CSG and concrete are compacted, the formwork 1 is lifted one stage with a crane or the like using the lifting tool 6, and the upper frame 1a is installed on the upper surface of the upper layer CSG and concrete. The frame 1a is installed at the position where the upper frame 1a has existed.

  When the mold 1 is moved upward, the water inside the frame 1a is drained from the drain port 5 to reduce the overall weight and facilitate the movement. In addition, since the upper and lower frame bodies 1a are coupled by the connecting material 2, the mold 1 can be moved simultaneously in the coupled stepped shape.

  In this state, the upper frame 1a and the upper metal mesh / expanded metal 10 protrude on the upper layer of CSG and concrete, so the next layer of CSG and concrete is placed inside this, Roll up and compact.

  When compacting the upper layer of CSG and concrete, etc., the shoulder is always protected by the mold 1 for the two steps of the layer of CSG and concrete, so that the shape of the staircase can be reliably protected. There is no.

  In the above embodiment, the two stages of layers such as CSG and concrete are protected by the mold 1, but the present invention is not limited to this, and the three stages can be protected by the mold 1. Three steps are preferable because they can protect the shoulder more reliably.

  Further, for the CSG and concrete layers below the formwork 1, a wire mesh / expanded metal 10 is laid in an L shape from the vertical wall of the shoulder to the bottom of each CSG and concrete layer. Therefore, even if the mold 1 is removed and the layers such as CSG and concrete are exposed, the deterioration of the surface and the skin of the aggregate can be prevented.

It is a perspective view which shows embodiment of the form for shoulders of a shoulder of this invention, and the method of compacting the shoulder which uses this. It is a side view of trapezoid CSG dam.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork 1a Frame 2 Connection material 3 Water supply port 4 Air vent hole 5 Drainage port 6 Lifting tool 7 Vibration roller 8 Trapezoid dam 9 Water 10 Metal mesh, expanded metal, etc. 11 Connection material

Claims (5)

  It is a mold for a shoulder used in a method for constructing a shoulder in a staircase, and a plurality of frames having a square cross section are connected in a staircase shape, and water for adjusting the weight is provided in the hollow inside of the frame. A shoulder-shoulder formwork characterized by filling.   The mold for a shoulder according to claim 1, wherein a water supply port and an air vent hole are provided at an upper portion of the frame body, and a drainage port is provided at a side portion.   The formwork for the shoulder according to claim 1 or 2, wherein the upper and lower frames are L-shaped connecting members that connect the upper side surface portion and the lower upper surface portion.   The formwork for the shoulder according to any one of claims 1 to 3, wherein the frame body is provided with a lifting tool that can be lifted in an integrated state of the frame bodies connected in a stepped manner.   Install a form that connects multiple frames with a square cross section in a staircase shape at multiple shoulders, tighten the top shoulder, and then step up the staircase one by one A method of compacting shoulders, characterized by refilling.

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