JP3477107B2 - Legal frame and method of forming the legal frame - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method frame having a core material and a method of forming the method frame, which is formed on a slope surface such as a land for construction or a slope of a mountain.

[0002]

2. Description of the Related Art It has been well practiced to form a legal frame on a slope for the purpose of protecting the slope. As one of the conventional method frame methods, there is a field casting method method. The in-situ casting frame construction method is to lay a net-like body on a slope, arrange a reinforcing bar to be a core material on the mesh-like body, and spray a mortar or concrete so as to surround the reinforcing bar to form a legal frame. It is a method of forming: -Since the intersections of the frames are integrated, bending and shear strength are large, and surface collapse on the slope can be suppressed. -Because it has good adhesion to the slope of the frame, it has strength against scour.・ It is easy to change the design on site according to the situation of the slope.・ Because basic concrete is not required, the construction period can be shortened. It is widely used for the following reasons.

However, the conventional cast-in-place frame method has the following problems because it uses the reinforcing bar as the core material as described above. That is, the reinforcing bar used as the core material in the conventional frame method is 5.5
Since it has a length of m or 6.0 m and cannot be wound up, it is very bulky. Therefore, it takes a great deal of effort to carry such a reinforcing bar to a slope which is a working position, and in some cases it is necessary to carry it by using a crane, which causes a problem that the cost of forming a legal frame increases. there were.

Further, when reinforcing bars are arranged on the slope,
The worker has to climb to a desired position on the slope while holding the rod-shaped reinforcing bar, which imposes a heavy burden on the worker.

Further, since it is impossible to use a reinforcing bar longer than the length or width of the slope, when the reinforcing bar is used as the core material, one reinforcing bar and another reinforcing bar are connected in the middle of the slope. They had to be bound, and this also deteriorated work efficiency.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is a cast-in-place method frame having the same strength as the conventional method frame or stronger than the conventional method frame. An object of the present invention is to provide a legal frame that has strength and can reduce cost by improving work efficiency, and a method for forming such a legal frame.

[0007]

In order to achieve the above object, the present invention comprises a core material arranged on a slope, and concrete or mortar is sprayed so as to surround the core material. The slope of the slope, the vertical direction along the slope of the slope
Star for reinforcing the core material and / or the transverse core material
-Wrap at least a portion of the wrap around the core
Provided is a legal frame composed of a wound chain member .

[0008]

[0009]

Further, the present invention is a method for forming a method frame by disposing a core material on the slope and further spraying mortar or concrete so as to surround the core material to form a method frame. Method for forming a legal frame using a chain member spirally wound around a core material as at least a part of a stirrup material for reinforcing the longitudinal core material along the direction and / or its transverse direction core material I will provide a.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a method for forming a legal framework according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a method frame 1 formed according to the method frame forming method according to the present embodiment. In addition, in the present embodiment, the case of forming a lattice-shaped legal frame is described as an example, but the present invention is not limited to such an embodiment, and for example, a legal frame that covers the entire slope can be used in various ways. It can be applied when forming the legal framework of.

First, the net-like body 2 is formed on the slope to form the slope frame.
To lay. The reticulate body 2 is used to prevent the mortar or concrete sprayed in a later step from slipping off or the thick layer base material, and is unnecessary when the inside of the frame is treated by other methods. be able to. As the mesh body, for example, lath net can be used,
This is fixed to the slope by raspin.

Next, a vertical core material (hereinafter referred to as a vertical stripe) is arranged along the slope direction of the slope. As the vertical stripe 3,
In this embodiment, a chain member is used.
The chain member refers to a member in which a plurality of links having a desired rigidity are rotatably connected in sequence, as shown in FIG.
It is a concept including various forms shown in (d).

As described above, the following effects can be obtained by using the chain member for the vertical stripe 3. That is, since the reinforcing bar used in the conventional method for forming a frame has a constant shape and cannot be wound up,
It has to be carried to a work position in a bulky state, which requires a great deal of labor for the carrying work itself. On the other hand, in the present embodiment, since the chain member that can be wound or separated is used as the vertical bar, the core material used as the vertical bar can be transported in a compact state, and the labor required for the transportation work can be achieved. Can be reduced.

Further, in the conventional method for forming a method frame,
In the middle of the slope, it was necessary to add and reinforce the reinforcing bars, and it took a lot of labor to arrange the vertical bars. That is, since it is impossible to use a reinforcing bar longer than the slope length of the slope, when using a reinforcing bar for the vertical bar, the worker goes to the desired position on the slope while holding the reinforcing bar, and there, It was necessary to place vertical bars on the entire slope while binding and other reinforcing bars. On the other hand, in the present embodiment, since the chain member is used as the vertical stripe,
A chain member that is longer than the slope length of the slope is rolled up to carry it to the upper end of the slope without being bulky, and the chain member is simply hung from the upper end of the slope toward the lower end of the slope to bring the chain member to the desired position. Can be easily placed. Therefore, as compared with the conventional method of forming the method frame, the step of arranging the vertical stripes can be simplified, thereby improving the work efficiency.

Further, when the chain member is used as the vertical bar as in the present embodiment, the vertical bar can also be used as a lifeline in the case of performing work on the slope. Further, work efficiency can be improved. That is, in the conventional method of forming a legal frame, the lifeline had to be stretched on the slope separately from the reinforcing bar arranged as the vertical bar, but in the present embodiment, the chain member is also used as the lifeline. be able to.

The chain member used as the vertical stripe is
It is preferable to prepare one longer than the slope length of the slope and cut it at the lower end of the slope, but in the middle of the slope,
It is also possible to add more. In such a case, FIG. 3 (a)
It is easy to use connecting members such as shackles, spring hooks, ring catches and simple bands as shown in (d) to each other, or to tie them with a binding wire, or simply tie the ends of the chain members. Can be added to.

Next, as shown in FIG. 4, a supporting member 4 for supporting the vertical streaks at a desired height from the surface of the slope is driven on the slope. As the supporting member, various members such as a preformed deformed bar, a simple anchor or a permanent anchor can be used and are appropriately selected according to various conditions such as the condition of the slope and the required strength of the legal frame.

Various modes can be applied to the position where the support member 4 is driven. For example, in the case where the support member 4 is used as a temporary fixing member for vertical stripes, as shown in FIG.
As shown in Fig. 4, it may be driven on the upper end surface of the slope and then removed after forming the slope, or as shown in Fig. 4 (b), a temporary fixing member for the vertical line and a reinforcing member for the slope. In the case of also being used as the above, the concrete or mortar described later may be sprayed on the inclined surface of the slope and with the supporting member supporting the vertical streaks. In addition, reference numeral 1'in the drawing is a winding member of the chain member.

Of course, the step of disposing the vertical streak 3 at a desired position and the step of driving the support member 4 can be reversed in order.

Next, the vertical streaks 3 and the supporting member 4 are tightly connected. In such a binding step, it is preferable to perform the binding process in order from the upper part to the lower part of the slope so that the chain member does not loosen. The chain member and the supporting member may be tightly connected by using the various connecting members shown in FIG. 3, binding by a binding wire, or the chain member may be directly tied to the supporting member.

Further, when the chain member sags only with the support member 4, a spacer 5 is provided between the adjacent support members 4 and 4, as shown in FIG. The spacer 5
Also, various forms can be used. For example, when the spacer 5 is used only for preventing the chain member from loosening, an anchor or the like may be used, and when it is also used as the formwork of the legal frame, various simple formwork such as a unit mesh frame may be used. Can be used.

Although the order of the spacer disposing step is not limited, it is preferable to dispose the spacer when disposing the supporting member in consideration of work efficiency.

Next, the horizontal main bars 6 (hereinafter referred to as horizontal bars) are arranged. In the present embodiment, a chain member is also used for the horizontal bar 6 as in the vertical bar (see FIG. 1). When arranging the chain members for the horizontal bars, care should be taken to eliminate slack in the lower end of the slope of the chain members for the horizontal bars as much as possible. Preferably, the transverse stirrup chain member can be connected to the vertical stirrup chain member at an intersection with the vertical stirrup chain member. In this way, by connecting the horizontal bar chain member to the vertical bar chain member, it is possible to prevent the lateral bar chain member from sagging and to improve the strength of the vertical bar and the horizontal bar. As a method of connecting the vertical bar chain member and the horizontal bar chain member, various methods such as using the connecting member shown in FIG. 3 or using a binding wire can be applied. The arrangement of the supporting member for the chain member for the horizontal stripes and the arrangement of the spacers if desired are the same as those for the vertical stripes.

As described above, the arrangement of the vertical stripes and the horizontal stripes is completed. Depending on the condition of the slope and the required strength standard, a stirrup material for reinforcing the vertical and horizontal bars is laid, but the chain member can also be used for these.

Thereafter, mortar or concrete 7 is sprayed so as to surround the vertical and horizontal stripes (see FIG. 1). The spraying process is the same as the conventional one. In this way, the method frame 1 is formed on the slope.

In the method of forming the method frame according to the present embodiment, since the chain member is used as the main bar, the work efficiency is remarkably improved as compared with the case where the conventional reinforcing bar is used as the main bar. be able to.

In the present embodiment, the chain members are used for both the vertical stripes and the horizontal stripes.
The present invention is not limited to such a form. For example,
The chain member may be used only for the vertical bars and the normal reinforcing bar may be used for the horizontal bars. On the contrary, it is also possible to use the chain member only for the horizontal bars. Furthermore, the chain member can be used only for a part of the vertical or horizontal stripes.
It is also possible to use reinforcing bars for both the vertical bars and the horizontal bars and use the chain member only for a part of the stirrup material in the longitudinal direction or the lateral direction. Further, in the present embodiment, the case where only one vertical bar and horizontal bar is arranged has been described as an example, but the present invention is not limited by the number of vertical bars or horizontal bars as a matter of course.

That is, the gist of the present invention is to use a chain member as at least a part of the longitudinal bars, the lateral bars, or the stirrup material for them, which are the main bars in the cast-in-place method frame. Since it has the effect of improving the work efficiency in the work of forming the legal frame and reducing the burden on the operator, various modifications within the scope of the present invention are within the technical scope of the present invention. included.

[0030]

EXAMPLES The results of the bending strength test of the method frame formed according to the method for forming the method frame according to the above-mentioned embodiment will be shown below.

Example 1 In this example, the main bar 21 as shown in FIG.
Mortar beam with one embedded chain member
0 was used. The external dimensions of the mortar beam 10 are height H1.
The length was 50 mm, the width W was 150 mm, and the length was 1000 mm. The chain member has a shape shown in FIG. 2 (a) and has a wall thickness B of 10 mm.
(Hereinafter referred to as chain (10)) was used. Table 1 shows the cross-sectional area and tensile strength of the chain (10).

[0032]

[Table 1]

Table 2 shows the mixing ratio of the mortar used in this example.

[Table 2]

As a reference, in order to know the strength of the mortar in the case of not having the main bars, three test pieces were prepared with a column-shaped (diameter 100 mm × height 200 mm) summit based on the composition shown in Table 2. 100 tons made by Shimadzu Corporation
The compression test was performed with a universal testing machine. As a result, the average compressive strength was 326 kg / cm ² .

The mortar beam according to this example was prepared by using a mold member made of plastic corrugated board based on the composition shown in Table 2. Further, in order to measure the strain of the main bar, the main bar was waterproofed, and then a strain gauge manufactured by Tokyo Sekiken Co., Ltd. was attached. Furthermore, the mortar was kneaded and mixed using a horizontal biaxial forced kneading mixer manufactured by Taiheiyo Kiko Co., Ltd., and a plastic ship (1400 mm x 600 mm, depth 2) that was watered.
Under water curing for 28 days.

The bending strength test was conducted as follows. That is, using a 200 ton universal testing machine manufactured by Shimadzu Corporation, the support fulcrum spacing (hereinafter referred to as span length S)
Was set to 900 mm, and the load was divided into three equal parts with respect to the span length (see FIG. 7). Further, in order to measure the strain on the mortar beam, two strain gauges for concrete manufactured by Tokyo Sokki Kenkyusho Co., Ltd. are used, and the two strain gauges are
Each of them was attached to both sides of the mortar beam at approximately the center in the longitudinal direction and 2 cm from the upper end.

Then, using a data logger (TDS303) manufactured by Tokyo Sokki Kenkyusho Co., Ltd., the relationship between the loading load and the strain was measured every 6 seconds, and the load at the time of crack occurrence was measured.
(kgf), deflection (mm) and strain (μm) were measured, and the maximum load representing the breaking strength and the number of cracks at that time were measured. In addition, the strain (μ
m) was measured. Such strength test was performed twice. The measurement results are shown in Table 3.

[0038]

[Table 3]

Comparative Example 1 As a comparative example to Example 1 , the reinforcing bar 1 was used as the main bar 21.
A strength test was conducted on a mortar beam in which a book was embedded.
The rebar uses JIS standard SD295A deformed rebar,
For comparison with the above-mentioned Example 1, the one having a diameter of 10 mm (hereinafter referred to as a reinforcing bar (10)) was used. The other conditions were the same as in Example 1 above. The cross-sectional area and tensile strength of the reinforcing bar (10) are shown in Table 1. The measurement results in Comparative Example 1 are shown in Table 3.

Embodiment 2 In this embodiment, the main bar 21 as shown in FIG. 6 (b) is used.
Mortar beam with two embedded chain members
1 was used. The chain member has a shape shown in FIG. 2 (a) and has a wall thickness B of 6 mm (hereinafter, referred to as chain 6).
Was used. The other conditions were the same as in Example 1 above. The cross-sectional area and tensile strength of the chain (6) are shown in Table 1 and the measurement results in Example 2 are shown in Table 3.

Comparative Example 2 As a comparative example with respect to Example 2, the reinforcing bar 2 is used as the main bar 21.
A strength test was conducted on a mortar beam in which a book was embedded.
The rebar uses JIS standard SD295A deformed rebar,
For comparison with Example 2, a diameter of 6 mm (hereinafter,
Reinforcing bar (6) was used. The other conditions were the same as in Example 2. The cross-sectional area and tensile strength of the reinforcing bar (6) are shown in Table 1 and the measurement results in Comparative Example 2 are shown in Table 3.

Embodiment 3 In this embodiment, the main bar 21 as shown in FIG. 6 (c) is used.
The strength test was performed using the mortar beam 13 having the and the stirrup material 22. Reinforcing bar (6) is used for the main bar,
As the stirrup material, a miscellaneous chain having a shape shown in FIG. 2 (a) and a thickness B of 3 mm was used. Other conditions are the same as in Example 1 above.
Same as in. The measurement results in Example 3 are shown in Table 3.

Comparative Example 3 As a comparative example to Example 3 , in this comparative example,
In Example 3, the diameter of the stirrup material was 4
A mortar beam consisting of round steel bars of mm was used. The other conditions were the same as in Example 3 above. The measurement results in Comparative Example 3 are shown in Table 3.

Embodiment 4 In this embodiment, the main bar 21 as shown in FIG.
And a stirrup material 22, and the stirrup material 22
The mortar beam 14 formed by spirally winding around the main bar 21 was used. Four reinforcing bars (6) were used for the main bars, and a chopping chain having a thickness B of 3 mm and a shape shown in FIG. 2 (a) was used for the stirrup material. Also, the external dimensions of the mortar beam are the height H
The measurement was performed with 150 mm, a width W of 150 mm, a length of 900 mm, and a span length S of 750 mm. The other conditions were the same as in Example 1 above. The measurement results in Example 4 are shown in Table 3.

[ Embodiment 5 ] In this embodiment, in the same manner as in Embodiment 4, the main bar is 2
A mortar beam as a book was used. The other conditions were the same as in Example 4. The measurement results in Example 5 are shown in Table 3.

Comparative Example 4 As a comparative example to Examples 4 and 5, a mortar beam having one reinforcing bar (10) as a main bar and no stirrup material was used. Other conditions are the same as in Example 4 above.
Same as in. The measurement results in Comparative Example 4 are shown in Table 3.

Comparative Example 5 As a comparative example to Examples 4 and 5, a mortar beam having two reinforcing bars (6) as main bars and no stirrup material was used. Other conditions are the same as in Example 4 above.
Same as in. The measurement results in Comparative Example 5 are shown in Table 3.

[0048]

[Discussion] (1) From the comparison between Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2, when the chain member is used as the main bar, there is almost no difference in the yield load from the case of the reinforcing bar. However, it was found that the maximum load becomes much stronger. As shown in Table 1, the chain members used in the above examples have tensile strengths somewhat higher than those of the reinforcing bars used in the comparative examples, but considering the difference in cross-sectional area and tensile strength between the two. However, it was not the ratio of the difference between the example and the comparative example regarding the maximum load. Therefore, it can be said that when a chain member is used as the main reinforcing bar, it can endure a yield load to the same extent and can withstand a larger maximum load as compared with a case where a reinforcing bar is used as the main reinforcing bar.

(2) Further, from the comparison between Example 1 and Example 2 and Comparative Example 1 and Comparative Example 2, when the reinforcing bar is used as the main bar, the number of cracks generated up to the maximum load is 1 to 2. On the other hand, it can be seen that the number of the cracks is 7 to 10 when the chain member is used as the main bar. This means that the physical properties of the mortar beam are obviously different between the case of using the reinforcing bar as the main bar and the case of using the chain member, and the dispersion of cracks is better when the chain member is used. Is shown. Good dispersion of cracks means that there is little risk of dispersal of fractured points and collapse at a single point. Therefore, it can be said that when a chain member is used as the main bar, the stress applied to the mortar beam can be dispersed, as compared with the case where the reinforcing bar is used as the main bar, there is less risk of collapse at one place.

(3) From the comparison between Example 3 and Comparative Example 3, when the chain member is used as the stirrup material, the yield load and the maximum load are the same as those when the reinforcing bar is used as the stirrup material. It has been found to have a load and also have comparable crack dispersibility. Therefore, it was confirmed that a chain member could be used as the stirrup material instead of the reinforcing bar.

[0051]

According to the law frame according to the present invention, the core material, since to use a chain member, the strength or it stronger strength comparable to conventional law frame using rebar core Yes At the same time, it is possible to reduce costs by improving work efficiency.

Further, according to the method for forming a frame according to the present invention,
Since the chain member is used for the core material, it is possible to form a legal frame having a strength comparable to or stronger than the conventional method frame using a reinforcing bar for the core material in a short period of time.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a method frame formed by a method frame forming method according to an embodiment of the present invention.

FIG. 2 is a diagram for illustrating a chain member used as a core material in the method frame shown in FIG.

FIG. 3 is a view for illustrating a connecting member for the chain member shown in FIG.

FIG. 4 is a diagram for illustrating a driving position of a support member in the method frame shown in FIG.

FIG. 5 is a diagram for illustrating an arrangement position of spacers that can be used in the method frame in FIG. 1.

FIG. 6 is a schematic perspective view showing a legal framework according to an embodiment.

FIG. 7 is a diagram showing load loading points in the embodiment.

[Explanation of symbols]

1 legal framework 2 reticulate body 3 vertical lines 4 Support members 5 spacers 6 horizontal lines

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Aki Mochizuki 232-1-6-33 Otsubo, Hachimmachi, Tokushima City, Tokushima Prefecture (72) Inventor Tomie Sakaguchi 1-3-3904, Taidei Town, Sakai City, Osaka Prefecture ( 56) References JP-A-2000-54391 (JP, A) JP-A-5-209410 (JP, A) JP-A-58-123924 (JP, A) Actually open flat 7-43182 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 17/20 104

Claims (2)

(57) [Claims] 1. A method frame having a core material disposed on a slope and spraying concrete or mortar so as to surround the core material, the vertical frame extending along the slope direction of the slope. At least part of the stirrup material for reinforcing the core material and / or the transverse core material thereof is constituted by a chain member that is spirally wound around the core material. . 2. A method for forming a method frame by arranging a core material on a slope and further spraying mortar or concrete so as to surround the core material, the method comprising forming a method frame along an inclination direction of the slope. Forming a legal frame characterized by using a chain member spirally wound around a core material for at least a part of a stirrup material for reinforcing the longitudinal core material and / or its transverse direction core material. Method.