JP2019086465A - Mold frame for concrete test piece - Google Patents

Abstract

To provide a mold frame for concrete test piece which can more effectively reduce the weight of a mold frame, has an easy structure, and can be inexpensively manufactured.SOLUTION: There is provided a mold frame 10 for concrete test piece for forming a concrete test piece having a rectangular parallelepiped shape which includes one bottom surface plate 11, two side face plates 12 and two end face plates 13 and is assembled in a rectangular parallelepiped shape with the upper surface used as an opening surface, in which at least one or both of the bottom surface plate 11 and the side face plate 12 is preferably formed using a synthetic resin-made molding plate by injection molding. Preferably, the end face plate 13 is formed using the synthetic resin-made molding plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete specimen form, and more particularly to a concrete specimen form for forming a rectangular parallelepiped concrete specimen.

  Concrete is composed of a predetermined amount of cement, water, fine aggregate, coarse aggregate, etc., and these are mixed and solidified by cement hydration from the flowable state which is not solidified yet, and desired Form a concrete structure that exhibits the strength of Depending on the content of cement and water, and the content of other mixed materials and additives, the physical properties of the concrete in a flowable state that does not solidify, and physical properties such as compressive strength and bending strength after solidification change. Therefore, prior to placing concrete at a construction site, various tests for confirming these physical properties are conducted, for example, according to the method defined in Japanese Industrial Standard (JIS Standard).

  In particular, as tests to confirm physical properties after solidification of concrete, strength tests such as compressive strength test and bending strength test, and measurement tests of length change associated with drying shrinkage and temperature change are performed. Among the tests, for example, in a bending strength test and a measurement test of change in length, the test is carried out using a rectangular solid concrete specimen having a predetermined size and quality preferably defined in JIS. In addition, cast molds have generally been used as molds for forming these rectangular solid concrete specimens, but cast molds are heavy in weight and have acceptable dimensions. In order to be assembled to the required tolerance dimensions, it is possible to assemble easily because it requires carefulness, assembly becomes complicated and assembly work takes a lot of labor and time. A molded concrete specimen form has also been proposed (see, for example, Patent Document 1).

JP, 2017-142108, A

  In the concrete specimen form of Patent Document 1, the end plate is formed using a synthetic resin plate for securing the standard cross-sectional dimension and reducing the weight, and the bottom plate and the side plate are hollow in a hexagonal shape. A hollow material made of an aluminum honeycomb core having continuous holes, a hollow material formed by arranging side by side aluminum square pipes, etc. are sandwiched by two aluminum panels, and an aluminum frame is formed around the hollow material. Although it is formed by surrounding with a member and weight reduction is achieved to some extent by these, since weight reduction is sufficient because metal materials such as aluminum are used for the bottom plate and side plate. Also, the structure is complicated and expensive.

  In particular, for example, when it is necessary to prepare a large number of concrete specimens for concrete of a predetermined composition and perform a bending strength test or a measurement test of length change, in a concrete manufacturing plant or a concrete placing site, It is necessary to stock a large number of concrete specimen formwork in an assembled state. For this reason, for example, the weight reduction of the concrete specimen form can be more effectively achieved for the purpose of, for example, further facilitating the handling by the worker of the concrete specimen form which is stocked. At the same time, it is desirable to develop a technology that makes the structure simple and inexpensive.

  An object of the present invention is to provide a mold for a concrete specimen which can reduce the weight of the mold more effectively and can be manufactured at a low cost with a simplified structure.

  The present invention is a cuboid concrete specimen which is configured to include a bottom plate, two side plates, and two end plates, and is assembled in a rectangular shape whose upper surface is an opening surface. A concrete specimen form for forming, wherein at least one or both of the bottom plate and the side plate are formed using a synthetic resin molded plate The above object is achieved by providing the

  And in the concrete specimen form of the present invention, an inner peripheral surface of the outer peripheral end surface excluding the upper end surface of any one or more of the bottom plate, the side plate, and the end surface plate has an inner peripheral surface with a female thread A female screw hole is formed, and a fastening hole is provided through one or more of the end edges of the bottom plate, the side plate, and the end plate. It is preferable that the fastening member having the male screw ridges be assembled in a detachable manner so that the upper surface becomes a rectangular solid having an opening surface by fastening the fastening member in the female screw hole.

  Further, in the concrete specimen form of the present invention, it is preferable that the fastening member provided with a male thread ridge is a thumb screw.

  Furthermore, it is preferable that the concrete specimen form of this invention covers the inner surface of the said side plate, and a steel plate is attached.

  Furthermore, it is preferable that the concrete specimen form of this invention covers the inner surface of the said bottom plate, and a steel plate is attached.

  Further, in the concrete specimen form of the present invention, the side edge notch for positioning is formed in the side edge on both sides inside the end face plate, in which the longitudinal end of the side plate is fitted. It is preferable that the same width as the width of the concrete specimen be provided.

  Further, in the concrete specimen form of the present invention, an end edge notch for positioning in which the lower end portion of the end face plate is fitted is formed at both end edges in the longitudinal direction on the upper surface side of the bottom plate. It is preferable that the distance of the same length as the length of the concrete specimen to be carried out be provided.

  Furthermore, in the concrete specimen form of the present invention, the handle for lifting the concrete specimen form in a state of being stacked vertically at the end portions on both sides in the longitudinal direction of the lower surface side of the bottom plate. Preferably, a handle notch is provided.

  In the concrete specimen form of the present invention, positioning convexes for positioning the concrete specimen form at the time of stacking up and down are provided on the lower surface of the bottom plate, and the side plate Alternatively, it is preferable that a positioning concave portion to which the positioning convex portion is fitted is provided at a position corresponding to the positioning convex portion on the upper end surface of the end surface plate.

  Further, in the concrete specimen form of the present invention, a linear convex portion serving as a mark of a position at which the loading roller is brought into contact when using the concrete specimen to be formed in a bending strength test of concrete on the upper surface of the bottom plate. Preferably, a linear cut is provided to form on the side of the concrete specimen.

  Furthermore, in the concrete specimen form of the present invention, the embedded strain is embedded in the concrete specimen when the concrete specimen to be formed is used in the measurement test of the change in length of the concrete in the end face plate. It is preferable that a cable insertion hole for inserting an input / output cable extending from the gauge is formed.

  Further, in the concrete specimen form of the present invention, the upper surface of the concrete specimen or the upper surface of the concrete specimen is used when using the concrete specimen formed on the side plate or the bottom plate for measurement of change in length of concrete due to drying shrinkage. It is preferable that screw holes or locking recesses, which are provided on the side surfaces for temporarily fixing the measurement terminals, are provided.

  According to the concrete sample form of the present invention, the weight reduction of the form can be achieved more effectively, and the structure can be simplified and manufactured inexpensively.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the formwork for concrete samples which concerns on preferable 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The concrete specimen formwork which concerns on preferable 1st Embodiment of this invention is demonstrated, (a) is a schematic top view, (b) is a schematic side view, (c) is a schematic end view. (A) of a steel plate attached covering the upper surface of a bottom plate is a top view, (b) is a side end view. A concrete specimen form according to a preferred second embodiment of the present invention will be described. (A) is a schematic top view, (b) is a schematic side view, and (c) is a schematic end view. A concrete specimen form according to a preferred third embodiment of the present invention will be described. (A) is a schematic top view, (b) is a schematic side view, and (c) is a schematic end view. A concrete specimen form according to a preferred fourth embodiment of the present invention will be described. (A) is a schematic top view, (b) is a schematic side view, and (c) is a schematic end view. A concrete specimen form according to a preferred fifth embodiment of the present invention will be described. (A) is a schematic top view, (b) is a schematic side view, and (c) is a schematic end view. A concrete specimen form according to a preferred sixth embodiment of the present invention will be described. (A) is a schematic perspective view, (b) is a schematic top view, and (c) is a schematic side view.

  The concrete specimen form 10 according to the preferred first embodiment of the present invention shown in FIG. 1 is, for example, a bending strength of concrete specified in JIS A 1106 as a test for confirming physical properties after solidification of concrete. It is used as a formwork for a specimen for forming a concrete specimen used in a test method. Here, a concrete sample used for a bending strength test method of concrete defined in JIS A 1106 is required to be prepared by the method of preparation defined in JIS A 1132, and the shape dimension and the state of the surface are It needs to be molded to be within an acceptable range. The concrete specimen form of the first embodiment preferably has a function to enable the concrete specimen to be easily formed so as to be in the shape dimension and the surface condition defined in JIS A 1132 and is lightweight. In order to make it easy to handle and to simplify the structure, it can be obtained at low cost.

  And as shown in FIGS. 2 (a) to (c), the concrete specimen form 10 according to the first embodiment of the present invention includes one bottom plate 11, two side plates 12, and two plates. And a mold for a test specimen for forming a rectangular solid concrete specimen which is assembled in the shape of a rectangular parallelepiped whose upper surface is an opening surface, and at least the bottom plate 11 and Either or both of the side plates 12 (both the bottom plate 11 and the side plates 12 in the first embodiment) are formed using a molded plate made of synthetic resin.

  Further, in the concrete specimen form 10 of the first embodiment, the outer peripheral end face excluding the upper end face of at least one of the bottom face plate 11, the side face plate 12 and the end face plate 13 (the first embodiment) In this case, female screw holes 14a and 14b having female screw ridges formed on the inner peripheral surface are provided in the side end faces on both sides of the side face plate 12 and the side end faces on both sides of the bottom plate 11; It penetrates any one or more of the end edges of the side plate 12 and the end plate 13 (in the first embodiment, both side edges of the end plate 13 and the lower end of the side plate 12) As the fastening member 16 having male screw ridges via the fastening holes 15a and 15b provided, the upper surface is preferably opened by fastening a fastening bolt to the female screw holes 14a and 14b. It becomes disassembled so that it becomes a cuboid shape There.

  Furthermore, in the first embodiment, the end face plate 13 is also formed using a molded plate made of synthetic resin.

  In the first embodiment, as described above, the concrete specimen form frame 10 is used as a formwork for forming a concrete specimen to be used in a concrete bending strength test method defined in JIS A 1106. It is a thing. Here, according to JIS A 1106, it is required to prepare a concrete sample used for the flexural strength test method of concrete according to the method prescribed in JIS A 1132, and according to JIS A 1132, the sample has a square cross section. The length of one side of the sample is 4 times or more and 100 mm or more of the largest dimension of the coarse aggregate, and the length of the test sample is 3 times the length of one side of the cross section. It is specified that the length is 80 mm or more longer, and that the standard cross-sectional dimension of the sample is 100 mm × 100 mm or 150 mm × 150 mm.

  Therefore, in the first embodiment, the bottom plate 11, the side plate 12, and the end plate 13 are injection molded using synthetic resin such as phenol resin, melamine resin, polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc. To form a rectangular parallelepiped concrete specimen which is a plate-like injection-molded article having a thickness of, for example, about 20 mm, which is a prismatic body having a cross-sectional dimension of 100 mm × 100 mm and a length of 400 mm. It is what constitutes the formwork for. That is, one bottom plate 11 is formed to have, for example, a planar shape having a width of about 100 mm and a length of about 440 mm. Each of the two side plates 12 is formed to have a side shape having, for example, a vertical width (height) of 120 mm and a length of about 420 mm. Each of the two end face plates 13 is formed to have a front shape having a size of, for example, 105 mm in vertical width (height) and 140 mm in horizontal width.

  Further, in the first embodiment, as shown in FIG. 2A, the side edge portions for positioning in which the end portions in the longitudinal direction of the side surface plate 12 are fitted to the side edge portions on both sides inside the end surface plate 13 The thickness of the steel plate 17a attached to the inner surface of the side plate 12 on both sides is 100 mm, which is the same width as the width of the concrete specimen to be formed, for example twice the thickness of 2 to 3 mm. In addition, it is provided at intervals w1 of 104 to 106 mm, which is the same as the width of the concrete specimen to be formed. As a result, after being assembled by fitting and positioning the ends on both sides in the longitudinal direction of the two side plates 12 to the side edge notches 13a on both sides of the two end plates 13, respectively, the facing is opposite Between the inner surfaces of the pair of side plates 12 on which the steel plates 17a of the pair of side plates 12 are attached, a distance of 100 mm, which is the same width as the width of the concrete specimen to be formed, is accurately maintained easily become.

  Furthermore, in the first embodiment, as shown in FIGS. 2 (a) to 2 (c), the side edge notches are formed on the side edges on both sides where the side edge notches 13a of the end face plate 13 are formed. The fastening holes 15a are provided in two upper and lower stages corresponding to the female screw holes 14a formed in the side end faces 12a on both sides of the side plate 12 so as to face 13a. As a result, the end plate 13 is screwed into the female screw hole 14a by, for example, screwing a fastening bolt as the fastening member 16 through the fastening hole 15a which is provided through the through hole. It is possible to easily and easily join together as one unit. In addition, this makes it possible to clamp the form surface in the longitudinal direction by using the fastening member 16 such as a fastening bolt or the like, and therefore when casting concrete into the formwork 10 for concrete specimen, the formwork It becomes possible to effectively avoid the occurrence of harami in 10. By using a hexagonal wrench as the fastening bolt, assembly work can be performed more easily than when using a normal bolt.

  In the first embodiment, as shown in FIG. 2 (b), an end edge portion cut for positioning in which the lower end portion of the end surface plate 13 is fitted to the end edges on both sides in the longitudinal direction of the upper surface side of the bottom surface plate 11. The thickness of the steel plate 17c attached to the inner side surface of the end face plate 13 on both sides is 420 mm, which is the same length as the length of the concrete specimen to be formed, for example twice the thickness of 2-3 mm. In addition, it is provided at a distance w2 of 424 to 426 mm similar to the length of the concrete specimen to be formed. By this, the lower end portions of the two end face plates 13 are respectively fitted and positioned in the end edge notch 11a on both sides in the longitudinal direction of the bottom plate 11, so that they are disposed facing each other after being assembled. Between the inner surfaces of the pair of end plates 13 on which the steel plates 17c are attached, a gap of 420 mm, which is the same length as the length of the concrete specimen to be formed, is easily held accurately.

  Further, in the first embodiment, as shown in FIGS. 2B and 2C, female screw holes 14b in which female screw ridges are formed on the inner peripheral surface at the side end surfaces 11b on both sides of the bottom plate 11 Are provided at four places at intervals in the longitudinal direction of the bottom plate 11. The female screw holes 14b are formed at four positions preferably at equal pitches in the longitudinal direction of the bottom plate 11 in correspondence with the position of the fastening holes 15b provided through the lower end edge of the side plate 12 described later. ing.

  Furthermore, in the first embodiment, at the end portions on both sides in the longitudinal direction of the lower surface side of the bottom plate 11, the concrete specimen form frame 10 in a state of being stacked vertically is held. A manual notch 11c is provided. By providing the notches for holding 11c, the concrete specimen form frame 10 can be lifted and easily carried.

  In the first embodiment, as described above, the fastening holes 15b are formed in the lower end edges of the two side plates 12, and the female screw holes are formed in the side end surfaces 11b on both sides of the bottom plate 11. Corresponding to 14b, it is provided in each of four places at intervals in the longitudinal direction of the side plate 12 and being arranged in a line along the lower end edge. Thus, the side plate 12 is fixed to the bottom plate 11 by screwing and fastening, for example, a fastening bolt as the fastening member 16 to the female screw hole 14b of the bottom plate 11 through the fastening holes 15b. It becomes possible to attach easily and detachably as integral.

  As described above, by integrally joining one bottom plate 11, two side plates 12 and two end plates 13 using the fastening bolt 16, the upper surfaces of these plate members can be obtained. After assembling into the rectangular parallelepiped shape which becomes an opening surface, after that, in the first embodiment, preferably the steel plate 17a is attached so as to cover the inner side of the side plate 12 and cover the inner side (upper side) of the bottom plate 11. The steel plate 17 b is attached, and the steel plate 17 c is attached to cover the inner side surface of the end face plate 13.

  The steel plates 17a, 17b, and 17c are steel plate members having a thickness of, for example, 2 to 3 mm, and the bottom plate 11, the side plate 12, and the like after being assembled in a rectangular parallelepiped shape whose upper surface is an opening surface. It can be easily processed and formed to have a rectangular or square front shape that matches the shape of the inner surface of each of the end plates 13. The steel plates 17a, 17b, and 17c can be easily attached and fixed by, for example, using a known adhesive or pressure-sensitive adhesive so as to cover the inner peripheral surface of the mold 10 without a gap.

  Here, when the steel plate 17a is attached so as to cover the inner side surface of the side surface plate 12, when performing the bending strength test method of concrete specified in JIS A 1106, it becomes the upper and lower loading surfaces of the concrete specimen It becomes possible to form the state of the surface of the side surface of the concrete specimen at the time of molding by the concrete specimen form frame 10 precisely with accuracy. By this, it is possible to easily form on the loading surface of the concrete sample a flat surface where no gap is generated anywhere between the contact surface by the loading device and the upper and lower loading surfaces of the concrete sample. Become.

  In addition, the steel plate 17b is attached so as to cover the inner side surface (upper side surface) of the bottom plate 11, so that concrete is driven into the concrete specimen form 10, and the driven concrete is stuffed into the form 10 by a push rod. At the same time, it is possible to effectively avoid that the thrusting rod which has protruded reaches the bottom plate 11 and damages the bottom plate 11.

  Furthermore, in the first embodiment, as shown in FIGS. 3A and 3B, the upper surface of the steel plate 17b attached to cover the upper surface of the bottom plate 11, which is preferably the upper surface of the bottom plate 11. In addition, when using a concrete specimen to be formed in a bending strength test of concrete, a linear notch 18 for forming a linear projection on the side surface of the concrete specimen, which serves as a mark of the position where the loading roller and the support roller are brought into contact. Can be extended in parallel to the short side direction of the bottom plate 11 and provided at a plurality of places. The bottom surface of the concrete specimen at the time of molding by the concrete specimen form frame 10 is a surface which becomes a side surface of the concrete specimen when the method for testing the flexural strength of concrete specified in JIS A 1106 is performed. By providing the linear incisions 18 on the top surface of the bottom plate 11 of the concrete specimen form 10, it is possible to load the side surface of the formed concrete specimen without affecting the flexural strength test of the concrete. It becomes possible to easily provide a mark clearly indicating the position where the load roller is brought into contact and the load is applied, and the position where the support roller of the load device supports the sample.

  In the first embodiment, on the upper surface side of the steel plate 17b, for example, a linear notch 18 for clearly indicating a center line dividing the steel plate 17b into two is provided, and a linear notch 18 of the center line is sandwiched. A linear notch 18 is provided on the upper surface of the formed concrete specimen, spaced 50 mm apart on both sides, to clearly indicate the position where the loading roller of the loading device is to be brought into contact. A linear cut 18 is provided to indicate the position where the support roller of the loading device is to be brought into contact with the lower surface of the formed concrete sample at a distance of 150 mm.

  The linear incisions 18 need not necessarily be provided on the steel plate 17b covering the inner side surface (upper side surface) of the bottom plate 11. If the steel plate 17b is not attached, the linear notch 18 is formed on the upper surface of the bottom plate 11 made of synthetic resin. It can also be provided directly.

  Furthermore, in the first embodiment, at least the side plate 12 and the end plate 13 made of synthetic resin except for the inner peripheral surface covered with the steel plates 17a, 17b and 17c of the assembled concrete specimen form frame 10. Preferably, the outer peripheral surface including the upper end surface is coated by applying fluorine processing or the like. As a result, when concrete is poured into the concrete specimen formwork 10 or the cast-in concrete is stuffed with a push rod, even if the mortar fraction of concrete adheres to the outer peripheral surface of the moldwork 10, the adhered mortar fraction It is possible to easily remove the cement before it solidifies, and it is possible to effectively prevent the mortar component from solidifying while adhering, and at the same time in the operation of driving in and putting in concrete. It becomes possible to improve the workability.

  And, according to the concrete specimen form 10 of the first embodiment having the above-mentioned configuration, it is possible to reduce the weight of the form more effectively, and the structure is simplified and manufactured inexpensively. It will be possible to

  That is, according to the concrete specimen form 10 of the first embodiment, both of the bottom plate 11 and the side plate 12 are made of synthetic resin as at least one of the bottom plate 11 and the side plate 12 or both. The end plate 13 is also formed using a molded plate made of synthetic resin. Therefore, according to the first embodiment, at least the bottom plate and the two side plates are compared with the conventional sample form in which a metal material such as aluminum or a cast material is used. And it becomes possible to handle the concrete specimen form 10 more easily, and the flat bottom plate 11 and side plate 12 made of synthetic resin formed using a mold The simple structure of the end plate 13 makes it possible to manufacture inexpensively and easily.

  Fig.4 (a)-(c) illustrate the formwork 20 for concrete specimens which concerns on the preferable 2nd Embodiment of this invention. In the concrete specimen form 20 of the second embodiment, the notches for holding are not provided at the end portions on both sides in the longitudinal direction of the lower surface side of the bottom surface plate 11, and in the lower surface of the bottom surface plate 11. Of the side plate 12 or the end plate 13 (in the second embodiment, the end plate 13), provided with positioning projections 21 for positioning the concrete sample form frame 20 when stacked up and down. It differs from the mold 10 for a concrete specimen according to the first embodiment in that a positioning recess 22 to which the positioning protrusion 21 is fitted is provided at a position corresponding to the positioning protrusion 21 on the upper end face. ing. In the concrete specimen form 20 of the second embodiment shown in FIGS. 4 (a) to 4 (c), components different from the concrete specimen form 10 of the first embodiment described above will be mainly described, and the same The description of the components of will be omitted. The description regarding the concrete specimen formwork 10 of the first embodiment described above is appropriately applied to components that are not particularly mentioned.

  That is, in the concrete specimen form 20 of the second embodiment, the positioning projections 21 extend in the lateral direction of the bottom plate 11 at the end portions on both sides of the bottom surface of the bottom plate 11 in the longitudinal direction. For example, it is provided as a linear convex rib having a semicircular cross-sectional shape. In addition, as the upper end surface of the side surface plate 12 or the end surface plate 13, the positioning concave portion 22 has a semicircular sectional shape at a position corresponding to the positioning convex portion 21 in each upper end surface of the two end surface plates 13. It is provided as a linear ditch provided with. When stacking a plurality of concrete specimen form frames 20 up and down, the positioning convexes 21 on the lower surface of the bottom plate 11 are stably engaged with the positioning concaves 22 on the upper end surface of the end plate 13. It becomes possible to stack in the state.

  Also according to the concrete specimen form 20 of the second embodiment, at least one or both of the bottom plate 11 and the side plate 12 (both the bottom plate 11 and the side plate 12 in the second embodiment) Since it is preferably formed using a molded plate made of a synthetic resin together with the end face plate 13, the same function and effect as the mold 10 for a concrete specimen of the first embodiment described above can be exhibited, and a convex for positioning The provision of the portion 21 and the positioning recess 22 makes it possible to stack the plurality of concrete sample form frames 20 in a stable state, and the number of form frames 20 that can be carried in one transportation It is possible to increase transport efficiency.

  Fig.5 (a)-(c) illustrate the formwork 30 for concrete samples which concerns on the preferable 3rd Embodiment of this invention. In the third embodiment, the concrete specimen formwork 30 is used as a formwork for a specimen for forming a concrete specimen, which is used in a measurement test of length change due to self-contraction of concrete. Different from the concrete specimen form 10 of the first embodiment in that the embedded strain gauge capable of measuring the change in length due to the self-contraction of concrete can be installed inside the formwork. There is. In the concrete specimen form 30 of the third embodiment shown in FIGS. 5 (a) to 5 (c), components different from the concrete specimen form 10 of the first embodiment described above are mainly described, and the same applies. The description of the components of will be omitted. The description regarding the concrete specimen formwork 10 of the first embodiment described above is appropriately applied to components that are not particularly mentioned.

  That is, in the concrete specimen form 30 of the third embodiment, the concrete specimen to be formed is embedded in the end specimen 13 when the concrete specimen to be formed is used for the measurement test of the change in length of the concrete. A cable insertion hole 33 is formed for inserting an input / output cable 32 extending from the embedded strain gauge 31. The insertion hole 33 is formed in the center portion of the end face plate 13 to have a size of, for example, about φ13 mm, and the inner peripheral surface of the insertion hole 33 and the input / output cable 32 in a state where the input / output cable 32 is inserted. The gap between the two can be closed using putty or the like.

  Also according to the concrete specimen form 30 of the third embodiment, at least one or both of the bottom plate 11 and the side plate 12 (both the bottom plate 11 and the side plate 12 in the third embodiment) Preferably, the end plate 13 is formed by using a molding plate made of a synthetic resin together with the end plate 13. Therefore, the same effects as those of the mold 10 for a concrete specimen according to the first embodiment can be obtained. Since the cable insertion hole 33 is formed, the embedded strain gauge 31 can be easily installed in advance inside the mold 30 by inserting the input / output cable 32 into the cable insertion hole 33. Become.

  FIGS. 6 (a) to 6 (c) illustrate a concrete specimen formwork 40 according to a preferred fourth embodiment of the present invention. In the fourth embodiment, the concrete specimen formwork 40 is a concrete used for measuring the change in length of concrete due to drying shrinkage using the contact gauge method, as defined in JIS A 1129-2. It is used as a formwork for a specimen for forming a sample, and is a gauge for embedding made of stainless steel as a measurement terminal 41 used for measurement of a length change by a contact gauge method inside the formwork. The point which can install a plug differs from the formwork 10 for concrete specimens of said 1st Embodiment. In the concrete specimen form 40 of the fourth embodiment shown in FIGS. 6 (a) to 6 (c), components different from the concrete specimen form 10 of the first embodiment described above are mainly described, and the same applies. The description of the components of will be omitted. The description regarding the concrete specimen formwork 10 of the first embodiment described above is appropriately applied to components that are not particularly mentioned.

  That is, in the concrete specimen form 40 according to the fourth embodiment, the concrete specimen to be formed on the side plate 12 is preferably used on the upper surface of the concrete specimen when it is used for the measurement test of the change in length due to drying shrinkage. Screw holes 43, through which fixing screws 42 for temporarily fixing the embedding gauge plug 41 to be installed are inserted, are provided in pairs, each having a predetermined distance of, for example, 300 mm.

  Also according to the concrete specimen form 40 of the fourth embodiment, at least one or both of the bottom plate 11 and the side plate 12 (both the bottom plate 11 and the side plate 12 in the fourth embodiment) Preferably, the end plate 13 and the molding plate made of synthetic resin are used together with the end plate 13. Therefore, the same effects as those of the mold 10 for a concrete specimen according to the first embodiment can be obtained. Since the screw hole 43 for inserting the fixing screw 42 for temporarily fixing the embedding gauge plug 41 is provided, the gauge plug 41 is temporarily fixed by using the fixing screw 42 for the embedding. It becomes possible to easily install in the inside of the mold 40 in advance.

  The screw holes 43 through which the fixing screws 42 for temporarily fixing the embedding gauge plug 41 can be inserted can also be provided in the bottom plate 11 of the concrete specimen form 40. By this, when using the concrete specimen to be formed for the measurement test of the length change due to the drying shrinkage, the gauge plug 41 for embedding can be installed on the preferably upper surface of the concrete specimen.

  7 (a) to 7 (c) illustrate the concrete specimen formwork 50 according to the preferred fifth embodiment of the present invention. In the fifth embodiment, similar to the concrete specimen form 50 of the fourth embodiment, the concrete specimen form 50 is dried by using the contact gauge method defined in JIS A 1129-2. It is used as a mold for a specimen used to form a concrete specimen, which is used for measuring the length change of concrete due to shrinkage, and for measuring the length change by contact gauge method inside the mold. It differs from the mold 10 for a concrete specimen of the first embodiment described above in that a gauge plug for attachment can be installed as the measurement terminal 51 to be used. In the concrete specimen form 50 of the fifth embodiment shown in FIGS. 7 (a) to 7 (c), components different from the concrete specimen form 10 of the first embodiment described above are mainly described, and the same The description of the components of will be omitted. The description regarding the concrete specimen formwork 10 of the first embodiment described above is appropriately applied to components that are not particularly mentioned.

  That is, in the concrete specimen form 50 of the fifth embodiment, the concrete specimen to be formed on the side plate 12 is preferably used on the upper surface of the concrete specimen when it is used for the measurement test of the change in length due to drying shrinkage. Locking recesses 52 for temporarily fixing the gauge plug 51 for attachment to be installed are provided in pairs, each having a predetermined distance of, for example, 300 mm. Here, the gauge plug 51 for attachment has, for example, a size of about φ9 mm, and is a stainless steel of a size of about φ1.5 mm on the back side of a disk-shaped base 53 made of mild steel having a thickness of about 3 mm. It is formed by projecting and fixing the spherical terminal 54 which consists of these. The locking recess 52 is formed as a recess including a spherical portion with a size of about φ1.5 mm at the attachment position of the gauge plug 51 for attachment on the inner surface of the steel plate 17a which is the inner surface of the side plate 12. The gauge plug 51 is easily installed in advance inside the mold 50 by locking the terminal 54 of the gauge plug 51 for bonding into the locking recess 52 of the inner surface of the side surface plate 12. It will be possible to When the steel plate 17 a is not provided on the inner side surface of the side surface plate 12, the locking recess 52 can also be provided directly on the inner side surface of the synthetic resin side plate 12.

  Also according to the concrete specimen form 50 of the fifth embodiment, at least one or both of the bottom plate 11 and the side plate 12 (both the bottom plate 11 and the side plate 12 in the fifth embodiment) Preferably, the end plate 13 and the molding plate made of synthetic resin are used together with the end plate 13. Therefore, the same effects as those of the mold 10 for a concrete specimen according to the first embodiment can be obtained. Since the locking recess 52 for temporarily fixing the gauge plug 51 for attachment is provided on the inner side surface of the mold 50, the gauge plug 51 is easily locked to the inside of the mold 50 by locking it to the locking recess 52. It becomes possible to set it up.

  In addition, the latching recessed part 52 which temporarily fixes the gauge plug 51 for affixing can also be provided in the bottom plate 11 of the formwork 40 for concrete samples. By this, when using the concrete specimen to be formed for the measurement test of the change in length due to drying shrinkage, it is possible to install the gauge plug 51 for attachment preferably on the upper surface of the concrete specimen.

  FIGS. 8 (a) to 8 (c) illustrate a concrete specimen formwork 60 according to a preferred sixth embodiment of the present invention. In the sixth embodiment, the concrete specimen form 60 has the bottom surface 11 of one sheet, the side surface plates 12 of two sheets, and the end surface plates 13 of two sheets, using the fastening member 16 and the upper surface Is assembled so as to be a rectangular solid having an opening face, and a thumb screw is used as a fastening member 16 having a male screw ridge.

  Also according to the concrete specimen form 60 of the fifth embodiment, at least one or both of the bottom plate 11 and the side plate 12 (both the bottom plate 11 and the side plate 12 in the sixth embodiment) Since it is preferably formed using a molded plate made of synthetic resin together with the end face plate 13, the same effect as that of the concrete specimen form 10 of the first embodiment described above can be achieved, and a fastening member As a thumbscrew is used as 16, it becomes possible to assemble the formwork 60 in a short time.

  The present invention is not limited to the above embodiments, and various modifications can be made. For example, it is not necessary that all of one bottom plate, two side plates and two end plates be formed using a synthetic resin molded plate, and at least the bottom plate and the side plate Any one or both of them may be formed using a molded plate made of synthetic resin. The concrete specimen form does not have to be a concrete specimen of 100 mm x 100 mm cross sectional dimensions, and has various other shapes and sizes of cross sectional dimensions such as 150 mm x 150 mm cross sectional dimensions. It can also be used as a formwork to form a concrete specimen.

10, 20, 30, 40, 50, 60 Formwork 11 for concrete specimen Bottom plate 11a Edge notch 11b Side edge 11c Holding notch 12 Side plate 12a Side edge 13 End plate 13a Side edge notch 14a, 14b female screw holes 15a, 15b fastening holes 16 fastening members (fastening bolts, thumb screws)
17a, 17b, 17c Steel plate 18 Linear notch 21 Positioning convex part 22 Positioning concave part 31 Embedded strain gauge 32 I / O cable 33 Insertion hole 41 Measuring terminal (gauge plug for embedding)
42 Fixing screw 43 Screw hole 51 Measuring terminal (, gauge plug for pasting)
52 Locking recess 53 Base 54 Terminal w1 Width same as width of concrete specimen w2 Length same as length of concrete specimen

Claims (12)

For forming a rectangular solid concrete specimen, which is configured to include a bottom plate, two side plates, and two end plates, and is assembled in a rectangular shape whose upper surface is an opening surface. Formwork for concrete specimens,
A concrete specimen form, wherein at least one or both of the bottom plate and the side plate are formed using a molded plate made of synthetic resin. A female screw hole in which a female screw ridge is formed on the inner peripheral surface is provided on the outer peripheral end surface of the bottom plate, the side surface plate, and the end surface plate except for one or more upper end surfaces,
The female fastening member is provided with a male thread ridge via a fastening hole provided through one or more of the end edges of the bottom plate, the side plate, and the end plate. 2. The form for a concrete specimen according to claim 1, wherein the concrete specimen is assembled so as to be able to be disassembled so as to have a rectangular parallelepiped shape whose upper surface is an opening surface by fastening in a screw hole.   The concrete specimen form according to claim 1 or 2, wherein the fastening member having a male screw ridge is a thumb screw.   The concrete specimen form according to any one of claims 1 to 3, wherein a steel plate is attached to cover the inner side surface of the side plate.   The concrete specimen form according to any one of claims 1 to 4, wherein a steel plate is attached to cover the inner surface of the bottom plate.   A side edge notch for positioning in which the longitudinal end of the side plate is fitted to the inner side edge of the end face plate has the same width as the width of the concrete specimen to be formed. The concrete specimen form according to any one of claims 1 to 5, which is provided.   In the end edges on both sides in the longitudinal direction on the upper surface side of the bottom plate, the edge notches for positioning for fitting the lower end of the end plate are the same distance as the length of the concrete specimen to be formed The formwork for concrete specimens according to any one of claims 1 to 6, wherein the formwork is provided.   At the end on both sides in the longitudinal direction on the lower surface side of the bottom plate, notches for holding are provided which serve as handles for lifting the concrete specimen form frame stacked in the vertical direction. The formwork for concrete specimens according to any one of Items 1 to 7.   A positioning projection is provided on the bottom surface of the bottom plate for positioning the concrete sample form when stacked vertically, and the positioning projection of the upper end face of the side plate or the end face plate The mold for a concrete specimen according to any one of claims 1 to 8, wherein a positioning recess in which the positioning protrusion is fitted is provided at a position corresponding to.   A line for forming a linear convex portion on the side surface of the concrete sample, which serves as a mark of the position at which the loading roller is brought into contact when using the concrete sample to be formed in the bending strength test of concrete on the upper surface of the bottom plate The concrete form according to any one of claims 1 to 9, wherein a cut is provided.   A cable for inserting an input / output cable extending from an embedded strain gauge, which is embedded in a concrete specimen when the concrete specimen to be formed is used in a measurement test of a change in length of concrete, in the end face plate The concrete form according to any one of claims 1 to 10, wherein the insertion hole is formed.   A terminal for measurement is temporarily fixed on the upper surface or the side surface of the concrete sample when the concrete sample to be formed is used for the measurement test of the change in length of the concrete due to drying shrinkage on the side plate or the bottom plate. The concrete specimen form according to any one of claims 1 to 11, wherein a screw hole or a locking recess is provided for retaining.

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