JPH033621Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a formwork made of fabric. More specifically, the present invention relates to a fabric formwork having a reinforced joint.

[Conventional technology]

In recent years, fabric formwork has been widely used in Hongcheon seawalls, waterway linings, and harbor erosion prevention works. This fabric formwork is constructed as a bag made of two layers of fabric, and the upper and lower two layers of fabric are connected to each other by connecting sections provided at predetermined intervals in the warp and weft directions. . This fabric formwork is used for the above-mentioned construction work by filling mortar or concrete between the upper and lower fabric layers of the bag and hardening it to form a cured product.

When injecting a slurry such as cement or mortar into the bag made of the two-layered fabric (woven fabric in this case), if the injection pressure is too high, the bag may be damaged. On the other hand, if the injection pressure is insufficient, not only will the predetermined volume of cured material not be obtained, but also the excess water will be removed from the surface of the two-layer fabric, which acts as a filter to selectively remove excess water from the slurry. It becomes impossible to discharge the resin sufficiently, resulting in a problem that the strength of the cured product becomes weak after curing. In addition, it is possible to increase the packing density of the fiber material of the entire fabric that makes up the bag, that is, use thicker threads for the entire fabric that makes up the bag, or increase the weaving density of the entire fabric. It is possible to prevent damage to the bag by weaving thick threads with a high weaving density, but in this case too, the above-mentioned surplus cannot be sufficiently discharged, resulting in a weakly cured product. I can only get it.

Damage due to slurry press-fitting of fabric forms often occurs mainly at the joints or joints of the bag. It is possible to reduce the damage at the seam by using a more thorough joining method (sewing, gluing, etc.).

However, there is currently no fabric formwork that has sufficient drainage capacity for excess water, has reinforced joints, and is resistant to damage as a whole.

[Problem that the invention attempts to solve]

The present invention eliminates the above-mentioned drawbacks of the conventionally known fabric molds, has reinforced joints, is less likely to break as a whole, and can be used with high injection pressure. The purpose is to provide a fabric formwork.

[Means for solving problems]

The purpose of this invention is to create two upper and lower layers of fabric, which are the area occupied by the warp and weft yarns that make up the binding part itself, and the areas that do not exceed a maximum of 30 mm on the top and bottom in the warp direction and on the left and right sides in the weft direction. The binding area is woven so that the packing density of the fiber material is at least 1.5 times that of the other areas of the two-layer fabric, thereby strengthening the binding area. This is achieved by using a fabric formwork.

The packing density of the fiber material in the joint forming area is
In order to increase the thickness by 1.5 times or more, it is possible to use a method of increasing the thickness of the thread used, a method of increasing the weaving density, or a method of combining these methods. For example, yarns having a denier of 1.5 times or more than warps and wefts used in other areas are used for a plurality of warps and wefts corresponding to the joint forming area, and the warp density and weft density of the other areas are substantially equal to each other. or by using threads having the same denier as the warp threads used in other regions for the plurality of warp threads corresponding to the area for forming the binding part, the warp density is 1.5 of the warp density of the other areas. The weft density of the other areas is substantially equal to the weft density of the other areas by using yarns arranged at a density that is more than twice as high as that of the wefts used in other areas. A method of weaving with the same density can be used.

〔Example〕

The present invention will be described in detail below with reference to the accompanying drawings showing an embodiment of the fabric formwork of the present invention.

FIG. 4 shows a part of the fabric mold according to the present invention in a state where mortar is filled inside the bag and hardened. The fabric form 1 according to the present invention consists of a front fabric 2 and a back fabric 3, and the fabrics 2 and 3 are connected to each other by a plurality of connecting parts 4 provided at predetermined intervals. A space is provided that is continuous and expands approximately parallel to the construction surface. In FIG. 4, the space is filled with mortar 5.

In order to show in more detail the structure of the embodiment of the fabric formwork according to the present invention shown in FIG.
As shown in the figure. In FIG. 1, only the front layer fabric 2 is visible, and the back layer fabric 3 having the same structure is constructed on the lower side. As shown in FIG. 1, a plurality of binding portions 4 are arranged at intervals in the warp and weft directions on the surface fabric 2 of the fabric form. Connection part 4
A joint-forming area 6 is provided for each joint 4, including the area and the periphery of the joint. In the embodiment shown in FIG. 1, the formation of the binding section forming area 6 is obtained by arranging the binding section warp zone 8 and the binding section weft zone 7 so as to cross each other.
Therefore, in the surface fabric 2, a plurality of warp bands 8 and weft bands 7 are arranged to intersect in the warp direction and the weft direction, and a joint forming area 6 is formed in each of the intersecting areas. Furthermore, a binding part 4 is formed in the center of the binding part forming area 6, and the surface layer fabric 2 and the back layer fabric 3 are connected. The area 9 other than the warp zone 8 and the weft zone 7 is a portion of the fabric formwork 1 having a regular texture, that is, a ground texture portion. Note that both edges 10a and 10b of the front fabric 2 shown in FIG. 1 are sewn to the corresponding edges of the back fabric 3 to form a bag-like fabric form.

One of the joint forming areas 6 is enlarged to form a second
As shown in the figure. As shown in FIG. 2, the connecting portion 4 is joined in a substantially circular manner. It is preferable that the surface layer fabric 2 and the back layer fabric 3 are joined in a circular manner because durability against slurry injection pressure is improved. However, the present invention is not limited to the shape of the joint 4;
It may be square or rectangular as is customary. The distances d ₁ and d ₂ between the outer edge of the joint 4 and the outer edge of the joint forming area 6 need to be large in order to increase the strength of the joint 4. But the distances d ₁ , d ₂
Increasing the warp zone 8 and weft zone 7
In addition to the economical problem of increasing the amount of yarn, it also reduces the discharge of excess water from the fabric form as a whole, so it is not preferable to make it larger than necessary. Usually distances d ₁ and d ₂ are at most 30
mm is sufficient, and it may be determined appropriately within this range by taking into consideration the thickness and weaving density of the yarn used, as well as the intended use.

Next, the structure of the joint forming area 6 will be explained with reference to FIG. However, FIG. 3 shows the configuration of the area 6 as a model, and the number of threads is merely an example, but this does not define the configuration of the present invention. In the configuration shown in FIG. 3, the warp threads 31,
Reference numerals 32, 33, and 34 constitute a ground weave 9, in which, for example, nylon high-strength yarns 840d are arranged at a weft density of 22 yarns per inch. Similarly, weft threads 11, 12, 14, 15
constitutes the ground structure 9, for example, nylon high strength yarn 8
40d is inserted at a weft density of 22 threads per inch. In FIG. 3, the warps 41 to 47 form a warp zone 8 for the binding section, and, for example, nylon high strength yarns 840d are arranged at a warp density of 44 yarns per inch. (Note that for convenience of drawing, the two warps are shown aligned and one reference number, for example 41, is attached, but this is not limiting.) Similarly, the wefts 21 to 27 are for the binding section. Forming the weft zone 7, for example, nylon high strength yarn
1890d is inserted at a weft density of 22 threads per inch. Each warp and weft thread is woven into a plain weave. A binding part forming area 6 is formed at the intersection area of the warp zone 8 and the weft zone 7, and a binding part 4 is provided in the center thereof. FIG. 3 shows a state in which the warp threads of the back layer are exposed on the surface of the binding part 4.

In the embodiment shown in FIG. 3, the density of the fibrous material filling of the joint forming area 6 is approximately twice that of the fibrous material filling of the base 9. In the embodiment shown in FIG. This multiplier is at least 1.5
It is necessary to set it to more than double. Although the present invention does not specify an upper limit to the magnification, in reality, the upper limit is 2.25 times. Increasing the density of fiber filling by 2.25 times or more is not preferable because it is difficult to weave and also has a negative effect on the discharge of excess water.

In the embodiment shown in FIG. 3, 840d warp yarns are used for the warp zone 8, but 1890d yarns may be used in the same way as the weft yarns, so that the warp density is 22 warps per inch.

With the configuration shown in Figure 3, the ground structure part is 20cm x 20cm.
A fabric mold according to the present invention was prepared by setting the area 6 for forming the joint part to be 5 cm x 5 cm, and providing a substantially circular joint part with a diameter of about 3 cm. In this case, the breaking strength of the ground weave is 65 in both the warp and weft directions for each layer.
Kg/cm width, and 145Kg/cm in the area for joint formation.
It was cm wide and warm. When mortar was injected into this fabric formwork at a discharge rate of 20 ³ cm per hour using a squeeze pump, the injection was smooth and the bag was not damaged at all.

FIG. 5 shows one area for forming a joint in another embodiment of the fabric mold according to the present invention. The joint in this embodiment is substantially square shaped.

[Effect of idea]

Since the fabric formwork of the present invention is constructed as described above, the fabric strength around the joint is increased, the pressure resistance of the bag body is increased, and damage to the bag body during slurry injection work is significantly reduced. I can do that.

Further, since the bag body has a high pressure resistance, the injection pressure of the slurry can be increased, and as a result, the discharge of surplus water of the slurry from the ground tissue portion can be promoted. Therefore, mortar or concrete hardens at a low water/cement ratio, improving the compressive strength of the hardened product.

Furthermore, since the speed at which the slurry is injected into the bag can be increased, there is an advantage in construction that the time required to inject the slurry into a fabric mold having a certain area can be shortened.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the structure of an embodiment of the fabric mold according to the present invention, and FIG. 2 is an enlarged view of one joint forming area of the embodiment shown in FIG. 1. FIG. 3 is a plan view showing a model of the thread usage in the area for forming the binding part shown in FIG. 2, and FIG. 4 is a plan view showing the fabric formwork shown in FIG. 1. FIG. 5 is a perspective view showing a part of the fabric mold in a hardened state after injecting mortar therein; FIG. FIG. 1...Fabric formwork, 2...Surface fabric, 3...
back layer fabric, 4, 4'...joining part, 5... mortar, 6... area for forming the joining part, 7... weft zone for the binding part, 8... warp zone for the binding part, 9...Ground texture, 21-27...Weft for weft zone, 41-47
...Warp for warp band.

Claims (1)

[Claims for Utility Model Registration] 1. It is constructed as a bag made of two layers of fabric, and the two layers of fabric of the bag are connected to each other by connecting parts provided at predetermined intervals in the warp and weft directions. In the fabric formwork used for filling and hardening mortar or concrete between the upper and lower two layers of fabric of the bag body to form a cured product, the connecting portions of the respective connecting portions are connected to each other. A fabric with two layers, each with a two-layer area for forming a joint, which is the area occupied by the warp and weft yarns constituting the fabric itself, and a maximum area not exceeding 30mm above and below in the warp direction and on the left and right sides in the weft direction. A fabric formwork characterized in that the fabric is woven so that the packing density of the fiber material is 1.5 times or more higher than in other areas of the fabric, thereby strengthening the joints. 2. A plurality of warps and wefts corresponding to the above-mentioned joint forming area are each used with yarns having a denier of 1.5 times or more than the warps and wefts used in other areas, so that the warp density and weft density of the other areas and the material are different. The fabric formwork according to claim 1, characterized in that the fabric formwork is woven with the same density. 3 A plurality of warp threads corresponding to the joint forming area are arranged at a density of 1.5 times or more of the warp density of the other areas using threads having the same denier as the warp threads used in other areas, while Woven with substantially the same density as the weft density in other areas using yarns that have a denier 1.5 times or more than the weft used in other areas for multiple wefts corresponding to the knot forming area. A fabric mold according to claim 1 of the utility model registration claim, characterized in that: