JPS6282123A - Protecting construction process for concrete on face of slope or the like - Google Patents

Abstract

PURPOSE:To form a concrete protection layer at a uniform precision, by filling up molds with ready mixed concrete while sending out the molds in sequence, after the unit molds made of a fabric which is water-permeable and cement- grain-impermeable are arranged on the surface for the execution of work. CONSTITUTION:Water-permeable and cement-grain-impermeable textiles 1, 2 are connected to each other on the periphery 3 and at connecting points 4, 5, and a mold C made of fabric is formed. Then, the unit mold 6 of the mold C is taken up, and is drawn out on the surface 7 for the execution of work by traction devices 11, 12 for sending out the mold freely, to be arranged. After that, the traction devices 11, 12 are slightly moved back in the sending-out direction, and a clearance is allowed by the unit mold 6, and the mold 6 is filled up with ready mixed concrete through an opening section 18. Besides, the molds are sent out by the traction devices 11, 12, and are repeated to be filled up with ready mixed concrete through an opening section 19 and after that, through an opening section 20, to form a protection layer 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a concrete protection method for constructing a concrete protection layer on slopes, riverbeds, etc. using fabric forms.

Conventional technology Fabric formwork used for concrete protection work on slopes, etc. has already been disclosed in Japanese Patent Publication No. 5 B-45536, Japanese Patent Publication No. 58-47521, or Japanese Patent Publication No. 59-42145.
The molds shown in the above publications are publicly known, but these fabric forms are flat before being filled with fresh concrete, but when filled with fresh concrete, they become as shown in Figure 5. Because of the filled concrete A, the bulge B becomes bulky in the vertical direction.

Therefore, the fabric formwork C shrinks in size by about 20% to 30% in the width direction D and the length direction E.

Of the above-mentioned shrinkage, the shrinkage in the width direction is absorbed and eliminated by the overlap of adjacent fabric forms, but the shrinkage in the length direction E is achieved by using fabric forms with a length that takes into account the amount of shrinkage in advance. This is a construction method in which the concrete is placed on the construction surface and then filled with ready-mixed concrete, which absorbs and erases it.

Problems to be Solved by the Invention In the conventional construction method described above, it is difficult to position the fabric formwork, tension control, etc. when filling fresh concrete with respect to the fabric formwork, which is placed on the construction surface with a margin in length. Because it is difficult,
The dimensional accuracy and uniformity of the formed concrete protective layer
The problem lies in the fact that the work required to maintain its properties requires skill, and skilled workers are required to stretch the fabric formwork and fill it with ready-mixed concrete.

Therefore, the present invention makes it easy to maintain the dimensional accuracy and uniformity of the form of the concrete protective layer to be formed, and to manage the tension of the fabric formwork for this purpose.

The purpose of this invention is to provide a concrete protection method using fabric formwork that allows easy control of the amount of fresh concrete filled.

Means for Solving the Problems In order to achieve the above-mentioned object, in the present invention, upper and lower fabrics made of synthetic fibers are woven with a density that allows water to pass through but not cement particles. A plurality of fabric unit formworks for concrete filling, which are connected at multiple points on the entire surface at equal intervals to form a bag body, are placed in the width direction of the unit formwork on the construction surface where the concrete protection layer is to be installed. When arranging the unit forms in parallel, the length of the unit forms is made a predetermined length longer than the length of the construction surface in the direction orthogonal to the parallel direction, and at least the l edge in the length direction of the unit forms is Take-up.

After pulling out the formwork outside the construction surface using a freely retractable traction device and placing the formwork on the construction surface, the unit formwork is filled with ready-mixed concrete while filling with ready-mixed concrete. The length contraction amount in the longitudinal direction due to the expansion of the unit formwork is
By adopting a construction method in which filling the unit formwork with ready-mixed concrete is continued while the unit formwork is sequentially drawn out to the construction surface for the predetermined length using a traction device, the tension of the unit formwork made of fabric can be managed; This makes it easy to manage the amount of fresh concrete filled, and forms a concrete protective layer with high dimensional accuracy and uniformity of form.

Function In the present invention, the unit form is lengthened by a predetermined length corresponding to the amount of shrinkage of the length of the form due to filling of fresh concrete, with respect to the length of the construction surface in the direction orthogonal to the parallel direction of the unit form. Place the frame on the construction surface, and at least 1 part in the length direction of the unit formwork
The ends are pulled out of the construction surface by a traction device, and a predetermined tension is applied to the unit formwork stretched over the construction surface by the traction, and ready-mixed concrete is filled into the formwork.

The unit formwork made of fabric swells due to the internal pressure of the fresh concrete filled in response to the tension applied by traction.

The degree of this swelling is adjusted by the tension within a range below the maximum limit.

The reduction in length due to the above-mentioned bulge is supplemented by the pulling out of the drawer toward the construction surface side by the traction device.

As mentioned above, the fresh concrete is filled with tension in the longitudinal direction by the traction device and swells, so that the upper and lower fabrics are connected at multiple points on the entire surface with equal intervals in the vertical and horizontal directions. The unit formwork is swollen with its connecting points aligned in an orderly manner in the length direction of the formwork, forming a uniform concrete protective layer with a so-called striated form.

The filling of fresh concrete is carried out in multiple steps starting from the bottom of the unit formwork and working upwards.

Embodiment Figures 1 to 4 show the construction state of an example of implementation, and as shown in Figure 5, the fabric is woven with a density that allows water to pass through but not cement particles. Made of fabric for concrete filling, in which upper and lower synthetic fiber fabrics 1.2 are connected at a peripheral edge 3 and at multiple connecting points 4, 5 on the entire surface at equal intervals in the vertical and horizontal directions to form a bag body. As shown in FIG. 1, the formwork C is a unit formwork 6 consisting of a constant width W and a constant length, and is slightly overlapped in the width W direction on the construction surface 7. They are arranged in parallel so that the entire width of the construction surface 7 can be covered.

In addition, the length of the unit formwork 6 is determined from the length of the construction surface 7 to a predetermined length corresponding to the amount of shrinkage in length due to swelling of the formwork 6 due to filling with fresh concrete, as described later. It is set to be longer by M.

In the unit formwork 6 of the illustrated example, one end edge 8 on the upper end side of the construction surface γ is a bag portion 9 spanning the entire width, a pipe 10 is inserted into the bag portion 9, and both ends of the pipe 10 are attached to a winch. In the illustrated example, the lower end edge 15 of the unit formwork 6 is attached to the lower end of the construction surface 7 at the lower end of the construction surface 7. 1 of the unit formwork 6 fixed to the construction surface 7 side with the anchor 17 and stretched on the construction surface 7
The edge 8 is pulled out of the construction surface 7 by a predetermined length M corresponding to the amount of contraction by the pulling devices 11 and 12, and a predetermined tension is applied to the construction surface 70 unit formwork 6.

In addition, the unit formwork 6 has openings 18, 19, and 20 for filling with fresh concrete at multiple locations in the length direction and width direction; It is then closed by an appropriate means such as sewing a patch.

1 and 2 show unit formwork 6 on construction surface 7 as described above.
It shows a state in which the concrete has been expanded and has not yet been filled with fresh concrete.

From the state shown in FIGS. 1 and 2, the traction device 11.1
2 is returned slightly in the drawing direction, and the unit formwork 6 is filled with ready-mixed concrete from the opening 18 after leaving a space of about 1/3 of the predetermined length M described above, to form the unit formwork 6. As shown in FIG. 3, the upper and lower fabrics 1.2 bulge in the lower part of the construction surface 7 between the connection points 4 and 5, forming a concrete layer.

Then, by letting out the traction device 11, 12 again, the same tension as at the beginning was applied to the remaining part of the unit formwork 6, and then
By repeating the filling of fresh concrete from the opening 19 and then from the opening 20, the unit formwork 6 was evenly filled with fresh concrete over the entire surface of the construction surface 7, as shown in FIG. A protective layer 21 is formed.

Note that the aforementioned openings 18, 19, and 20 are closed by appropriate means after being filled with fresh concrete.

Note that the upper edge 22 of the protective layer 21 is attached to the construction surface 7 by appropriate means.
It is fixed to the side, and then the traction device 11, 12, cable 13,
14. The pipe 10 is removed and the same filling of ready-mixed concrete is repeated for the next unit formwork placed adjacent to it.

In the illustrated example, the lower edge 15 of the unit formwork 60 is fixed to the construction surface 7 side, but it may be fixed to the upper edge side and the lower edge 15 side pulled out of the construction surface by a traction device, Of course, both upper and lower edges of the unit formwork may be pulled out of the construction surface by a traction device.

Effects The present invention has the above-described configuration 1, in which the construction surface is moved by a traction device to a predetermined length commensurate with the shrinkage in the longitudinal dimension that occurs in the unit formwork as it bulges due to filling with fresh concrete. Pull out the unit formwork outside, add only the extra length necessary for the unit formwork to bulge by filling it with ready-mixed concrete, give it to the unit formwork by feeding it out using a traction device, fill it with ready-mixed concrete, and swell it, and repeat this process sequentially. Since a protective layer is formed over the entire length of the construction surface, the tension to be applied to the unit formwork when filling with fresh concrete can be easily controlled and managed by the amount of feed of the traction device. The filling amount of fresh concrete can be controlled and managed by the magnitude of the tension, and therefore the degree of swelling of the unit formwork can also be controlled and managed, making it possible to easily form a concrete protective layer with uniform dimensional accuracy. be.

In addition, since the fresh concrete is filled under controlled tension, the bulges of the unit formwork become uniform, which has the effect of making the completed concrete protective layer uniform in shape.

Furthermore, since the tension of the unit formwork can be controlled and managed only by operating the traction device, less skilled work is required, which also has the effect of improving workability.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of an example of the unit formwork in the expanded state, Fig. 2 is a schematic side view of what is shown in Fig. 1, and Fig. 3 is similar to Fig. 2 at the initial stage of filling fresh concrete. Figure 4 is a schematic side view of the second stage at the time of completion of fresh concrete filling.
FIG. 5 is a schematic side view similar to the figure, and a cutaway slope view showing an example of a bulging state of a fabric formwork filled with concrete. 1.2: Upper and lower fabrics, 4.5: Connection points, 6: Unit formwork,
7: construction surface, 8: l edge, 11, 12: traction device, length of L two-unit formwork, 2: length of construction surface, M: predetermined length,
W: Width of unit formwork.

Claims (1)

[Claims] Concrete is a bag made by connecting upper and lower synthetic fiber fabrics, which are densely woven to allow water to pass through but do not allow cement particles to pass through, at multiple points on the entire surface at equal intervals in the periphery and in the vertical and horizontal directions. When arranging a plurality of fabric unit formwork for filling in parallel in the width direction of the unit formwork on the construction surface where the concrete protective layer is to be installed, the length of the unit formwork should be set perpendicular to the parallel direction. The formwork is constructed by making it a predetermined length longer than the length of the construction surface in the direction, and pulling out at least one edge in the length direction of the unit formwork out of the construction surface using a traction device that can be freely rolled up and fed out. After spreading and arranging it on the surface, while filling the unit formwork with fresh concrete,
The amount of contraction in length in the longitudinal direction due to expansion of the unit formwork due to filling with fresh concrete is satisfied by sequentially drawing out the predetermined length of the unit formwork onto the construction surface using a traction device. ,
Concrete protection method for slopes, etc. where fresh concrete is continuously filled.