JP2019190257A - Stainless reinforcement bar strengthening underground mold - Google Patents

Abstract

To provide an underground mold reinforced with stainless reinforcement bar capable of thin weight saving, improving workability by a simplification of an assembly method and functioning as a part of the body integrated completely with an after installment concrete.SOLUTION: It is characterized in that a stainless reinforcement bar is arranged vertically and horizontally in a grid shape inside of the body of an underground mold consisting of concrete molding, a truss shape steel member processed in a spire shape is mounted so that a straight line part is embedded into the underground mold inside and an internal timbering is connected via the truss shape steel member.SELECTED DRAWING: Figure 1

Description

  In the present invention, a cement-based mortar (hereinafter referred to as “base material mortar”) is used as a base material of a concrete-based molded body, and a stainless steel rebar (hereinafter referred to as “stainless steel rebar”) is used as a reinforcing material. The present invention relates to an embedded formwork in which a truss-like steel material, which is arranged in a lattice shape in a direction and is processed into a shape having a spire-like mountain on a surface on which a concrete frame is constructed, is attached.

  In the construction of a concrete frame, the embedded formwork functions as a forming formwork when the concrete is driven, and after the cast concrete has hardened, it functions as a part of the body of the concrete structure, and when a normal formwork is used This eliminates the need for de-frame work like this, which contributes to the rationalization of concrete frame construction.

  The embedded form has a function as a forming form at the time of placing concrete and a function to become a part of the main body of the frame concrete after the concrete is hardened. An embedded formwork for forming a concrete frame is required to have a performance capable of withstanding a lateral pressure during concrete pouring. For this reason, a method of reinforcing short fibers (fibers) made of stainless steel, steel, vinylon or the like into a base material mortar has been implemented.

  The embedded formwork must be held so that deformation such as deflection and sag does not occur with respect to the side pressure acting when the concrete is driven. For this reason, it is necessary for the embedded formwork to support the surface on the concrete placing side, that is, the surface on the side that becomes the main body of the concrete frame by an internal support (separator). The internal support is threaded at the end, and is generally fixed by screwing into an insert embedded in an embedded formwork. There is also a method in which a through hole is provided in the embedded formwork and the end portion of the internal support is fixed from the outside.

  The embedded form is formed by (a) roughening the surface portion on the concrete-injecting side using a jointing agent, (b) embedding the coarse aggregate so as to be exposed about half, and (c) an uneven groove. It is made to integrate so that it may function as a part of the main body of a concrete frame by making it adhere with post-cast concrete by a boundary surface by either methods, such as providing (cotter).

JP 2002-26640 A JP 2011-84861 A

  Since the embedded formwork uses short fibers as a reinforcing material as described above, the load resistance performance against tensile stress when cracks occur is small, and there is no tenacity to break. The buried form is subjected to the greatest load when the concrete that functions as the forming form is placed. For this reason, it is fundamental to design the embedded formwork so as not to crack against the assumed concrete side pressure. For this reason, it has been difficult to set the thickness of the embedded formwork to about 50 mm or less.

  When a reinforcing bar is used as a reinforcing material for the embedded formwork, the reinforcing bar functions as a member responsible for a tensile force after the occurrence of a crack, so the problem of the tenacity when using the short fibers described above is solved. However, in the method using reinforcing bars as reinforcements, it is necessary to consider the prevention of reinforcing bar corrosion due to the invasion of corrosive factors from surface cracks. For this reason, it is necessary to increase the thickness of the cover concrete from the surface of the embedded form to the surface of the reinforcing bar, and the plate thickness of the embedded form is increased. This indicates that it is a difficult method to adopt for an embedded formwork that is desired to be thin and light in terms of workability. The permissible crack width of reinforcing bars made of ordinary carbon steel (hereinafter referred to as “reinforcing bars”) against corrosion of reinforcing bars is determined by the thickness of the reinforcing bar cover c ( mm), it is calculated as 0.005 × c (mm). For example, when the allowable crack width is 0.2 mm and the necessary thickness of the reinforcing bar cover is obtained, c = 40 mm. Therefore, when a normal reinforcing bar having a diameter of 10 mm is arranged as a reinforcing material in two directions, the vertical direction and the horizontal direction, the embedded formwork needs to have a thickness of 40 + 10 + 10 + 40 = 100 mm or more. Moreover, when using an embedded formwork in a severe salt damage environment, it is necessary to set the thickness of the reinforcing bar cover to be larger. For this reason, since the embedded formwork becomes a thick member, the weight is further increased, resulting in a decrease in workability and an increase in transportation cost. Therefore, it is practical to use reinforcing bars as a reinforcing material for the embedded formwork. It wasn't.

  An insert embedded in an embedded formwork for the purpose of connecting the embedded formwork to the internal support work needs to set a deeper embedding depth in order to increase the resistance to an applied pulling load. Since the embedded depth of the ready-made insert is about 30 mm or more, it is necessary to set the thickness of the embedded formwork to 50 mm or more in consideration of securing the cover from the outside of the embedded formwork to 20 mm or more.

  The internal support for supporting the embedded formwork is basically joined directly to the insert embedded in the embedded formwork. Moreover, since the insert is fixed to the embedded formwork, the position cannot be changed during construction. For this reason, it is necessary to assemble the internal support according to the position of the insert of the embedded formwork. Therefore, troubles relating to the adjustment of the position of the internal support work during construction impede improvement of workability.

  The integration of the embedded formwork and post-cast concrete is performed by a method in which the joint surface of the embedded formwork that has been surface-treated to ensure adhesion is adhered to the post-cast concrete, and this is in response to the force to be peeled off. It is done by a method with low resistance. For this reason, peeling tends to occur at the interface between the embedded formwork and the post-cast concrete when the structure is used. When such peeling occurs, concrete deterioration factors such as moisture and chloride ions permeate through the boundary surface, leading to a decrease in durability. Moreover, when the area of the peeled part is enlarged, there is a risk that the embedded formwork on the surface layer peels off from the main body concrete and falls. These phenomena need to be prevented from occurring because they not only shorten the life of the structure but also cause a reduction in safety.

  The present invention solves the above-described problems of the conventional embedded formwork, that is, enables the embedded formwork to be thinner and lighter, improves the workability by eliminating the work involved in assembling the embedded formwork, An object of the present invention is to provide an embedded formwork having a function of completely integrating a frame with post-cast concrete to form a part of a concrete body.

  In order to solve the above-mentioned problem, the stainless steel reinforcing bar embedded form according to the present invention is characterized in that a stainless steel bar excellent in corrosion resistance is arranged in a grid pattern vertically and horizontally inside the embedded form body made of a concrete-based molded body. And

  Moreover, the stainless steel reinforcement reinforced embedding form of this invention is characterized by using a deformed steel bar as a stainless steel reinforcement arranged vertically and horizontally in the mold body.

  Further, the stainless steel reinforcing bar embedded form according to the present invention is characterized in that a surface to be arranged toward the main body side of the concrete is roughened to be roughened and adhered to the main body concrete.

  Moreover, in order to solve the said subject, the stainless steel reinforcement reinforced embedding form of this invention attaches the truss-like steel materials processed into the shape which has a spire-like mountain in an embedding formwork, It is characterized by the above-mentioned. Here, the truss-like steel material is made of stainless steel rebar or round steel, and can be completely fixed to the embedded form by embedding the straight portion in the embedded form.

  Moreover, in order to solve the above-mentioned problem, the stainless steel reinforcement reinforced embedded form of the present invention attaches and fixes an assembly steel material such as a round steel bar or a deformed steel bar inside the spire portion of the truss type steel material bent into a spire shape. It is possible to make it possible. Here, the assembled steel material can be a deformed bar steel or a round steel, and the material can be either stainless steel or carbon steel.

  Moreover, in order to solve the above-mentioned problem, the stainless steel reinforcement reinforced buried form of the present invention attaches an internal support to an arbitrary position of the steel material attached to the inside of the spire part of the truss-like steel material to support the side pressure when the concrete is driven. It is characterized by that.

  According to the stainless steel reinforcement reinforced buried form of the present invention, the internal support is directly joined to the assembled steel material fixed to the inside of the spire-shaped steel part attached to the buried form, thereby acting on the buried form during concrete pouring. The load due to the lateral pressure of concrete can be transmitted directly to the support work.

  According to the stainless steel reinforcement reinforced buried form of the present invention, the gap between the truss-like steel material and the buried mold attached to the buried mold and the gap between the assembled steel material fixed to the truss-like steel and the buried mold Since the post-cast concrete is filled, the joining force at the boundary surface between the embedded formwork and the post-cast concrete increases. For this reason, exfoliation of an embedded formwork and post-casting concrete can be prevented by unifying an embedded formwork and post-cast concrete together with the adhesion effect by the roughening processing given to the surface of the embedded formwork.

  According to the stainless steel reinforcement reinforced buried form of the present invention, it is possible to prevent peeling of the buried form and the post-cast concrete as described above. For this reason, it is possible to prevent deterioration factors from entering the concrete frame from the boundary surface between the embedded formwork and the post-cast concrete to improve durability, and to prevent the embedded formwork from peeling off from the post-cast concrete.

  According to the stainless steel reinforcement reinforced buried form of the present invention, the internal support can be fixed at an arbitrary position of the steel material attached via the truss-like steel material attached to the buried form, so that the adjustment position of the internal support can be adjusted. The labor involved can be omitted, and workability can be improved.

It is a figure which shows the structure of the stainless steel reinforcement reinforcement embedding form which concerns on this invention, arrangement | positioning of the stainless steel reinforcement for reinforcement, and arrangement | positioning of the truss-like steel materials processed into the spire shape. It is a figure which shows the method of fixing the truss-like steel materials processed in the shape of a spire in the inside of the stainless steel reinforcement reinforcement embedding form which concerns on this invention. It is the figure which showed the method of attaching an internal support to the truss-like steel material of the stainless steel reinforcing bar reinforcement embedding form concerning the present invention, and making it function as a forming form at the time of concrete placement.

  Hereinafter, an embodiment of an embedded form using a stainless steel rebar according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the embedded form according to the present invention has a structure in which longitudinal stainless steel rebars 3 and lateral stainless steel rebars 4 are arranged in a lattice shape as reinforcing materials inside an embedded form body 2 made of a concrete molding. And In addition to a flat plate, the embedded formwork body 2 can be manufactured in any shape such as a curved surface or a corner portion.

  The truss-like steel material 5a is fixed to the embedded formwork according to the present invention by embedding the straight part of the truss-like steel material 5a in the embedded formwork main body 2 along the lateral stainless steel rebar 4 as shown in FIG. By the way. Here, the truss-like steel material 5a can be arranged in either the vertical direction or the horizontal direction. The truss-like steel material 5a is formed by processing two or more spire portions as shown in FIG. 2 (a). However, the truss-like steel material 5b has a spire portion as shown in the truss-like steel material 5b shown in FIG. 2 (b). It is also possible to use a single one. Since such a fixing method is employed, the truss-like steel material 5a or the truss-like steel material 5b can bear a pulling force acting via the spire portion.

  The attachment of the internal support 6 to the truss-like steel material of the embedded form according to the present invention is performed by attaching the end of the internal support 6 to the assembled steel material 7 fixed inside the spire part of the truss-like steel material 5a as shown in FIG. This is done by fixing. The internal support 6 can be attached to the assembled steel material 7 by hooking the steel material end portion into a hook shape or connecting it to a threaded steel end portion with a U-shaped bolt via a long nut. it can. The internal support 6 can be fixed to the assembled steel material 7 by any method such as bolting or welding. As shown in FIG. 3, in consideration of the load due to the side pressure of the concrete acting on the embedded formwork body 2, a necessary number of internal supporters 6 are arranged to form the embedded formwork body 2 when the concrete is placed. It can function as a frame.

  As shown in FIG. 3, the embedded formwork according to the present invention fills the space between the assembled steel material 7 attached to the truss-like steel material 5 a and the embedded formwork body 2 with post-cast concrete, thereby allowing the embedded formwork and the rear formwork. The cast concrete can be completely integrated.

1: Buried formwork 2: Buried formwork body 3: Longitudinal stainless steel rebar 4: Lateral stainless steel rebar 5a: Truss-like steel material (type in which the spire is continuous)
5b: Truss-like steel material (type with a single spire)
6: Internal support 7: Assembly steel

Claims (5)

  Stainless steel reinforcement reinforced embedded form with stainless steel reinforcing bars arranged vertically and horizontally in an embedded form made of concrete.   The stainless steel reinforcing bar embedded form according to claim 1, wherein the stainless steel reinforcing bar is a deformed steel bar.   3. The stainless steel reinforcement reinforced embedded form according to claim 1, wherein a straight portion of a truss-like steel material processed into a spire shape is embedded and fixed inside the embedded form.   4. The stainless steel reinforcement reinforced embedded form according to claim 1, wherein an assembled steel material for attaching an internal support is attached to the inside of the spire portion of the truss-like steel attached to the form. .   5. The stainless steel reinforcement reinforced embedded form according to claim 1, wherein an assembled steel material for attaching an internal support is attached to the inside of the spire portion of the truss-like steel attached to the form.

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