JP3920307B1 - Manufacturing method of wife formwork and precast segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wife formwork capable of easily and accurately producing a joint surface of a precast segment.
A wife mold 2 used for manufacturing a precast segment 1 constituting a long structure by being joined together.
And the same shape mold surface 2a, 2b is formed in both surfaces of the equal thickness board part 21, and the precast segment 1 of the direction which cross | intersects that surface is formed in the edge of the mold surface 2a, 2b A connection frame 5 is provided for connection to the body part mold 3 for molding the surface.
[Selection] Figure 1

Description

  The present invention relates to a wife formwork suitable for manufacturing a precast segment constituting a long structure such as a bridge, a buried tunnel or a tower-like structure such as a tower, and a precast segment using the wife formwork. It relates to the production method.

  Conventionally, a precast segment method as disclosed in Patent Document 1 or the like is known as a method for constructing a bridge superstructure.

  In this precast segment construction method, for example, a plurality of precast segments having a width of 30 m, a length of 5 m, and a height of about 4 to 7 m are manufactured from prestressed concrete, reinforced concrete, or the like at a factory or a manufacturing yard.

  Then, the precast segments that have been manufactured are transported to the site and constructed in sequence by building a long bridge girder.

  At this time, if the joint surfaces between adjacent precast segments do not match, when prestress is introduced, local compressive stress is generated on the joint surface and the end surface is destroyed, or the prestress stress of the expected amount In order to prevent this from happening, it is impossible to secure the design strength, so the match cast method is adopted.

This match cast method uses the end face of the precast segment that was produced earlier as the end form of the new precast segment, and uses the end face of the precast segment that is actually joined. It is said to be a suitable method.
JP 2000-290933 A

  However, in the conventional match cast method, the precast segment to be newly manufactured cannot be formed into an accurate shape unless the existing precast segment is installed at an accurate position. However, since the weight of the precast segment is large, the position is finely adjusted. Is difficult and requires a large moving device.

  In addition, the concrete used for the production of precast segments will undergo self-shrinkage and drying shrinkage over time, so if you do not manage the curing period of the precast segments that will be the wife formwork to be newly produced, There is a possibility that the shape of the precast segment will vary and the joining surfaces will not match or may not be joined.

  Even if the precast segments that have been produced are damaged or malfunctions occur, the precast segments placed on both sides of the precast segments are drying and shrinking, so these precast segments can be used as wife molds. It is difficult to remanufacture.

  Accordingly, an object of the present invention is to provide a wife formwork that can easily and accurately produce a joint surface of a precast segment, and a method for producing a precast segment using the wife formwork.

In order to achieve the above object, the present invention is a wife formwork used for manufacturing a precast segment constituting a long structure by joining a plurality of surfaces, and has both sides of a plate-like member of equal thickness. In addition, a mold frame surface having the same shape for forming the joining surface of the precast segment is formed, and a body part mold for molding the surface of the precast segment in a direction intersecting the surface at the edge of the mold frame surface It is a wife form frame provided with connection means for connecting to the frame.

  Here, on the mold surface formed on both surfaces of the plate-like member, a protruding portion having a linear portion and an enlarged portion with one end extending to the edge of the mold surface is provided with respect to the plate-like member. Can be provided symmetrically.

  Furthermore, as the connection means, a connection frame for forming a part of the surface of the precast segment that intersects the mold surface can be extended from the mold surface in the main body mold direction.

  Further, the present invention provides a method for producing a precast segment using the above-mentioned wife formwork, wherein the body formwork is connected to the connecting means using the wife formwork as a first wife formwork, and the first wife mold is used. A space surrounded by the first wife mold frame, the second wife mold frame, and the main body mold frame by connecting the wife mold frame as a second wife mold frame to an end of the main body mold frame opposite to the frame A cement-based mixed material is cast into a precast segment, and after the cement-based mixed material is cured, the second wife mold and the main body mold are demolded, and the first wife mold Precast for producing a plurality of precast segments by repeatedly connecting the main body formwork and the second end formwork and placing a cement-based mixed material on the formwork surface on which the precast segment is not formed That the production method of the segment And butterflies.

  Here, the main body mold is connected to the connection frame using the wife mold as the first wife mold, and the wife mold is formed at the end of the main body mold opposite to the first wife mold. Is connected as a second wife mold, and a cement-based mixed material is placed in a space surrounded by the first wife mold, the second wife mold, and the main body mold to form a precast segment, After the cementitious mixed material is hardened, the second end formwork and the main body formwork are removed from the mold, and the first end formwork of the precast segment of the first end formwork is not formed on the connection frame on the formwork surface. The main body part formwork is connected at a predetermined inclination, and the second end formwork is connected to the end of the main body part formwork opposite to the first end formwork, and a cement-based mixed material is placed. By repeating this, a plurality of precast segments can be produced.

As yet the cementitious mix materials, compressive strength 150 N / mm ² or more, flexural tensile strength 25 N / mm ² or more, using a fiber reinforced cementitious composite material which split Tensile strength with 10 N / mm ² or more mechanical properties can do.

  Such a fiber reinforced cementitious mixed material is obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reactive particles, and a dispersant with water. It can be obtained by mixing 1 to 4% of the total volume of fibers having a diameter of 0.1 to 0.3 mm and a length of 10 to 30 mm in a cement matrix.

  In the wife formwork of the present invention configured as described above, a formwork surface is formed on both surfaces of a plate-like member formed to have an equal thickness, and a joining surface of two precast segments manufactured by the formwork surface Can be matched.

  Such a wife formwork is easy to reduce in weight because it only uses the formwork surface formed on the plate-like member, and the precast segment can be manufactured with high accuracy by connecting the main body formwork via the connecting means. can do.

  In addition, since the joint surface of the precast segment is formed by the same shape of the wife mold frame, the completed shape can be made substantially the same even if self-shrinkage or drying shrinkage occurs over time.

  Furthermore, if the projection part which has the linear part extended to the edge part on the both sides of the formwork surface of the wife formwork and the enlarged part is provided symmetrically with respect to the plate-like member, A concave portion having the same shape is formed on the end surfaces of the two molded precast segments, and a hole having one end penetrating the surface of the precast segment can be provided by opposing the concave portions of adjacent precast segments.

  When the hole is filled with a filler and cured, the cured portion becomes a shear key that completely matches the recess, and shear force can be transmitted between the precast segments.

  In addition, by extending the connection frame to the wife mold to connect with the main body mold, the shape of the joint surface and the side surface of the precast segment in the vicinity thereof can be made into a fixed shape and has a bent portion. Even a precast segment of a long structure can form a joining surface with high accuracy.

  Further, in the precast segment production method of the present invention, the wife mold and the main body mold used for the precast segment produced earlier are diverted to the mold of the precast segment produced later, The frame can be used economically.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 and 2 show a precast segment 1 constituting a girder structure spanned on a bridge pier such as a bridge or an artificial ground, a wife mold 2 as a mold used for manufacturing the precast segment 1, and a main body. The perspective view of the partial mold frame 3 and the connection frame 5 is shown.

  First, in terms of the configuration, the precast segment 1 of the present embodiment has an upper floor slab with a width protruding from this girder on a U-shaped girder in cross section composed of two webs and a lower floor slab that form side walls. It is provided integrally.

  And the end form frame 2 which forms the end surface (joint surface) of the joining direction of this precast segment 1 has the same shape mold surface 2a, 2b on both surfaces of the equal thickness plate part 21 as an equal thickness plate-shaped member. It is formed.

  The equal thickness plate portion 21 is formed of a constant thickness steel plate, stainless steel plate, synthetic resin plate or the like, and matches when the equal thickness plate portion 21 is removed on both sides of the equal thickness plate portion 21. A joint surface (matching joint surface) can be formed.

  In addition, the first mold surface 2a and the second mold surface 2b formed on both sides of the equal thickness plate portion 21 are provided with a plurality of protrusions 4,. Is attached.

  The projecting portion 4 includes a semi-cylindrical linear portion 41 and a truncated quadrangular pyramid-shaped enlarged portion 42 (see FIG. 3) provided in the middle of the linear portion 41. The upper end is provided so as to reach the upper edge of the mold surface 2a, 2b.

  The details of the arrangement of the protrusions 4 will be described with reference to FIG. 1. The protrusions 4 and 4 having the vertically enlarged portions 42 are respectively formed on the two webs of the first mold surface 2a of the wife mold 2. The protrusions 4 having the horizontally long enlarged portions 42 are attached to the lower floor slab at two locations, and the protrusions 4 having the horizontally long enlarged portions 42 including the overhanging portions are also attached to the upper floor slab. It is attached to the place.

  The protrusion 4 can be formed of a material such as wood, rubber, polystyrene foam, urethane rubber, and the enlarged portion 42 attached to the first mold surface 2a as shown in FIG. It is fixed to the equal thickness plate portion 21 by a fixing bolt 43 inserted from the side and an anchor nut 44 screwed into the tip thereof.

  Further, the enlarged portion 42 and other linear portions 41 attached to the second mold surface 2b are attached to the mold surfaces 2a and 2b with an adhesive.

  Further, the protrusions 4,... Attached to the first mold surface 2a and the second mold surface 2b are arranged on the first mold with reference to the fixing bolt 43 and the like so as to be symmetrical with respect to the equal thickness plate portion 21. The same shape is provided at the same position on the frame surface 2a and the second mold frame surface 2b.

  Further, the equal-thickness plate portion 21 is formed in an inverted hat shape to form the end face of the above-mentioned precast segment 1, and bolt holes 22 as connecting means are formed at the edge portions of the mold surface 2a, 2b. A plurality of openings are opened.

  As shown in FIG. 1, a connection frame 5 for molding the side surface of the precast segment 1 orthogonal to the first mold surface 2 a of the wife mold frame 2 is connected to the bolt holes 22,. The body part formwork 3 is connected using the connection means.

  As shown in FIG. 2, the connection frame 5 includes an outer surface mold frame 51 having a concave shape in cross-sectional view for forming the outer surface of the precast segment 1, and a cross-sectional view in an R-shaped shape for forming the inner surface of the precast segment 1. And a side mold 52.

  The outer surface mold 51 and the inner surface mold 52 are provided with flange portions 51a and 52a that extend in the direction perpendicular to the mold surface at the edges, respectively. As shown in FIG. 1, a plurality of bolt holes 51 b and 52 b for performing bolt joining with the wife mold 2 and the main body mold 3 are provided.

  The main body mold 3 is a member having the same shape in cross-sectional view as the connection frame 5 and having a different length in the extending direction.

  Similarly to the connection frame 5, the main body part mold 3 is also composed of an outer surface mold 31 and an inner surface mold 32, and flange portions 31 a and 32 a and bolt holes 31 b and 32 b are respectively provided. . In FIG. 2, all illustrations of the bolt holes of the mold are omitted.

  The precast segment 1 formed by the wife mold 2, the connection frame 5 as its connection means, and the main body mold 3 is made of prestressed concrete or reinforced concrete using a cement-based mixed material such as concrete. be able to.

  That is, a space surrounded by a pair of wife formwork (first wife formwork 2A, second wife formwork 2B) and main body formwork 3 or connection frame 5 installed to form a bottom surface or a side surface. In addition, the precast segment 1 can be formed by placing a cement-based mixed material.

  In addition, as the cement-based mixed material, it can be manufactured using an ultra-high strength fiber-reinforced cement-based mixed material.

  This fiber reinforced cementitious mixed material mixes metal fibers into a cementitious matrix obtained by mixing a composition containing cement, aggregate particles, pozzolanic reactive particles, and a dispersant with water. To make.

  Here, an aggregate material such as cinnabar having a maximum particle size of 3.0 mm or less, preferably 2.5 mm or less is used for the aggregate particles. Further, as the pozzolanic reaction particles, those having a particle size of 15 μm or less are used. For example, silica fume or the like is used as a highly active pozzolanic reaction particle having a particle size of 0.01 to 0.5 μm, and fly ash or blast furnace slag is used as a low activity pozzolanic reaction particle having a particle size of 0.1 to 15 μm. To do. These pozzolanic reactive particles having different activities can be mixed or used alone. Further, at least one type of the dispersant is used in order to improve fluidity.

For the metal fiber, for example, a steel fiber having a diameter of about 0.1 to 0.3 mm and a length of about 10 to 30 mm and a tensile yield stress of 2600 to 2800 N / mm ² is used. Further, this steel fiber is mixed in an amount of about 1 to 4% of the total volume of the fiber-reinforced cementitious mixed material to be produced.

A member formed of the above-mentioned fiber-reinforced cement-based mixed material manufactured with such a blend has a compressive strength of 150 to 200 N / mm ² , a bending tensile strength of 25 to 45 N / mm ² , and a split tensile strength of 10 to 25 N. / Mm ² , water permeability is 4.0 × 10 ⁻¹⁷ cm / sec, salt diffusion coefficient is 0.0019 cm ² / year, and elastic modulus is 50 to 55 GPa.

  Next, the manufacturing method of the precast segment 1 of this Embodiment is demonstrated.

  First, as shown in FIGS. 1 and 4 (A), a pair of wife molds 2A and 2B, connection frames 5 and 5 to be connected to them, and a main body mold 3 arranged between the connection frames 5 and 5, respectively. To form a space surrounded by the formwork.

  In addition, when the precast segment 1 to be manufactured is arranged at the end portion of the long girder structure, the end form frame 2 of the present embodiment is provided only on one end surface where a joining surface needs to be formed. It is only necessary to install a normal end form such as a steel plate for the other end face.

  Further, a release material is applied to the inner side surfaces of these molds so that they can be easily removed.

  Although not shown, a reinforcing bar is disposed in the space surrounded by the formwork as needed, and a precast segment 1A is manufactured by filling a cement-based mixed material such as concrete or a fiber-reinforced cement-based mixed material.

  FIG. 3 is a top view of a cross section in the same direction as the line AA in FIG. 2 in a state in which the cement-based mixed material is filled.

  When connecting the connection frame 5 to the first formwork surface 2a of the first end formwork 2A, the bolts 6 and nuts 61 are bolted together with the positioning pins 7 as shown in FIG. To do.

  Further, since the anchor nut 44 screwed into the tip of the fixing bolt 43 that penetrates the equal thickness plate portion 21 is embedded and fixed in the precast segment 1A, the first mold surface 2a and the enlarged portion 42 are connected to the precast segment. It does not peel off from the 1A joint surface and no gap is generated.

  After the precast segment 1A produced in advance reaches a predetermined strength, the second wife mold 2B, the main body mold 3 and the connection frames 5, 5 used for the production are removed, and one of the precast segments 1A is removed. 2 in which only the first wife form 2A is left on the joint surface.

  Subsequently, as shown in FIG. 4B, the connection frame 5 is connected to the second mold surface 2b of the first wife mold 2A, and the main body mold 3, the connection frame 5, and the second wife mold Arranged in the order of 2B.

  Thus, the precast segment 1B is formed by filling a cement-based mixed material into the mold assembled next to the precast segment 1A with the first wife mold 2A interposed therebetween.

  After the precast segment 1B reaches a predetermined strength, the precast segment 1A manufactured in advance is removed by releasing the connection between the first end form 2A and the connection frame 5 by the bolt joint.

  At this time, as shown in FIG. 3, since the first end form 2A is fixed to the precast segment 1A via the anchor nut 44, the enlarged portion pasted with the adhesive on the second form 2a side 42 is peeled to loosen the fixing bolt 43, and the bolt connection between the fixing bolt 43 and the anchor nut 44 is released to remove the first end form 2A from the precast segment 1A.

  Then, a new anchor nut 44 is screwed into the tip of the fixing bolt 43, and the enlarged portion 42 on the second mold surface 2b side is again attached to a predetermined position with an adhesive.

  As shown in FIG. 4D, the first end form 2A removed from the precast segment 1A in this way is adjacent to the precast segment 1B manufactured later and joined to the precast segment 1A. It is assembled at a position opposite to the joint surface.

  Next, the joining method of the precast segment 1 of this Embodiment is demonstrated.

  The precast segments 1A, 1B,... Manufactured as described above have a shape in which the joint surfaces formed by the first mold surface 2a and the second mold surface 2b of the wife molds 2A, 2B match. Since it is molded, matching joining can be performed if the adjacent precast segments 1A, 1B face each other in the same manner as in the manufacturing process except for the end frames 2A, 2B.

  The joint surface will be described with reference to FIG. 5 which is a cross-sectional view in the same direction as the BB line direction of FIG. 2. An adhesive 9 such as an epoxy resin or an acrylic resin is applied to the end surfaces of the precast segments 1A and 1B. Is applied, and both are bonded by an adhesive 9, and a prestress is applied by tensioning a tension member such as a PC steel wire or a PC steel bar communicated over a plurality of precast segments 1A, 1B,. Is introduced.

  In this way, the space between the precast segments 1A, 1B,... Is fixed and cannot move. The filler 8 is filled toward

  The linear hole portion 1 a is formed by the linear portion 41 of the protruding portion 4, and the enlarged hole portion 1 b is formed by the enlarged portion 42 of the protruding portion 4.

  If the plurality of linear holes 1a,... Provided with a space between the precast segments 1A, 1B are filled with the fillers 8, and then cured, the enlarged holes 1b,. The filling material 8 filled in becomes a shearing key for transmitting a shearing force between the precast segments 1A and 1B.

  As the filler 8, a polymer material such as cement-based non-shrink mortar, resin mortar, epoxy resin, or the above-mentioned cement-based mixed material can be used.

  In particular, when the fiber-reinforced cement-based mixed material is used as the filler 8, high deformation rigidity and shear strength can be exhibited with respect to the shear force acting on the shear key.

  Next, the operation of the manufacturing method of the wife form 2 and the precast segment 1 according to the present embodiment will be described.

  The joint surface of the precast segment 1A of the present invention configured as described above can be formed into a matching joint shape that matches the joint surface of the precast segment 1B disposed adjacently.

  For this reason, only a part of the end face is in contact and local joining compressive stress is not generated on the joining face, and the end faces of the adjacent precast segments 1A and 1B are brought into uniform contact with each other to obtain a desired prestress. Can be introduced.

  In other words, the end surfaces in the joining direction of the precast segments 1A and 1B can be formed into a matching shape by being formed with the equal thickness plate portion 21 formed to be equal in thickness.

  The wife mold 2 that uses both sides as the mold surfaces 2a and 2b is a thin and light member by using a constant thickness plate portion 21 having rigidity that does not deform due to the fluid pressure of the cement-based mixed material to be filled. Since it is easy to handle due to weight reduction, it can be easily installed at an accurate position.

  Further, even if the curing of the precast segment 1A to be produced in advance is not completely completed, the wife molds 2A and 2B can be used for production of other precast segments 1B, so that the precast segments 1A and 1B can be used in a short period of time. ... can be produced.

  Further, if the precast segments 1A, 1B,... Are manufactured using the end forms 2A, 2B that do not deform depending on time, it can be easily manufactured again and again.

  By the way, at the joint between the precast segments 1A and 1B, it is necessary to transmit shearing force and torsional moment in addition to transmitting bending moment. This bending moment can be transmitted by introducing prestress between the precast segments 1A and 1B, but in order to transmit shearing force and torsional moment, the adhesive 9 increases the frictional force between the joint surfaces, It is effective to provide a shear key.

  Therefore, if a plurality of protrusions 4,... Are provided on the formwork surfaces 2a, 2b,... Of the end formwork 2A, 2B, the precast segment 1 formed by the end formwork 2A, 2B. A plurality of concave portions are formed on the end surface, and the concave portions are linear hole portions 1a,... Having one end penetrating the surface of the precast segments 1A, 1B by making the end surfaces of the adjacent precast segments 1A, 1B face each other. It becomes the enlarged hole 1b.

  When the linear holes 1a,... And the enlarged holes 1b,... Are filled with the filler 8 and cured, the cured parts serve as shear keys between the precast segments 1A, 1B. Can be transmitted.

  Further, if the shear key is formed by the filler 8 filled after the precast segments 1A and 1B are brought into contact with each other in this way, the shear key can be made to completely match the shape of the enlarged hole portion 1b. Therefore, local compression stress is not generated in the fitting portion due to a manufacturing error as in the conventional method in which unevenness is provided on the end face in advance and the fitting portion is not damaged.

  Furthermore, by diverting the wife molds 2A and 2B, the main body mold 3 and the connection frames 5 and 5 used for the precast segment 1A manufactured earlier to the mold of the precast segment 1B manufactured later. The formwork can be used economically.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  Some bridge girder structures are constructed with an arched vertical gradient, and others are constructed in a curved shape in plan view. In addition, a curved tunnel may be constructed even in a submerged tunnel.

  In the first embodiment, a case will be described in which the precast segments 1C and 1D are inclined and joined as shown in FIG.

  In such a case, it is necessary to provide a joining angle (bending angle) between the precast segments 1C and 1D. In the first embodiment, as shown in FIG. A case where such a vertical gradient is provided will be described.

  First, the preceding precast segment 1C is manufactured by the method described in the above embodiment.

  And the connection frame 12 as a connection means is connected to the 1st end form frame 2A arrange | positioned at one end surface of 1 C of precast segments similarly to the case where there is no bending angle (refer FIG. 7). Here, FIG. 7 is a cross-sectional view of a cross section in the same direction as the AA line direction of FIG.

  The connection frame 12 is composed of an outer surface mold 121 and an inner surface mold 122, and the outer surface mold 121 and the inner surface mold 122 have flange portions only on the side connected to the first wife mold 2A. 121a and 122a are provided and formed in an L shape in a sectional view.

  The connection frame 12 and the main body part formwork 13 are connected via the attachment plate 10,..., And the attachment plate 10,. Mounting bolts 10b for mounting are fixed by welding or the like.

  That is, when the precast segment 1C manufactured in advance is inclined at a predetermined angle with respect to the horizontal line 11 and the main body part formwork 13 is installed in parallel to the horizontal line 11, the connection frame 12 and the main body part formwork 13 are not When viewed from the side, a triangular or trapezoidal gap is generated.

  It is the attachment plate 10,... That is installed to close the gap. On the inner side surface of the attachment plate 10, a gap adjusting material 10 a that fills the gap between the connection frame 12 and the main body mold 13. ... are arranged.

  The attachment plate 10 is made of a steel plate or the like, and the gap adjusting material 10a is formed of wood, styrene foam, foam rubber or the like and is attached to the attachment plate 10 with an adhesive or the like.

  Further, the hole 10d through which the mounting bolt 10b of the attachment plate 10 is passed is formed to be large so that it can cope with the inclination of the connection frame 12 and the main body mold 13 within a certain range.

  Then, the attachment plates 10,... Are installed so as to cover the gap between the connection frame 12 and the main body mold 13 and fixed with the nuts 10c,.

  On the other hand, as shown in FIG. 8 which is a cross-section in the same direction as the CC line direction of FIG. 2, the upper surface and the lower surface of the lower floor slab of the precast segment 1D are also formed by the mold by the bending angle. The attachment plate 101 is formed of a flexible material such as rubber.

  In this way, the connection frame 12 is connected to the end forms 2A and 2B of the present invention, and the main body form 13 is connected to the connection frame 12 via the attachment plate 10.

  For this reason, even when a folding angle is provided between the precast segments 1C and 1D, the bent portion can be provided at a location deviated from the position of the joining surface, so that the joining surface can be formed with high accuracy.

  In addition, since it is only necessary to provide a bent portion on the side of the precast segment 1D to be manufactured later, the angle can be finely adjusted on the main body formwork 13 side, which is lighter than that of the precast segment 1C. become.

  Further, if the gap is filled by the attachment plate 10, it is possible to easily cope with a case where the folding angle is large or the case where the bending is combined in both horizontal and vertical directions.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the second embodiment, a bending angle forming method by a method different from the first embodiment will be described with reference to FIG.

  In Example 2, the connection frame 5 and the main body mold 3 used in the above embodiment are used.

  Then, by preliminarily adjusting the distance between the flange part 51a of the connection frame 5 and the flange part 31a of the main body part mold frame 3 by interposing a gap-adjusting material 15 having a trapezoidal shape or a triangle or a quadrangle in cross section. The segments 1 and 1 can be set to a predetermined inclination, or the length of the precast segment 1 in the extending direction can be adjusted.

  The spacing adjusting material 15 may be made of styrene foam, styrene board, synthetic resin plate, rubber or the like.

  In this way, by merely interposing the gap adjusting member 15 between the connection frame 5 and the flange portions 51a and 31a of the main body part mold 3, a folding angle can be easily provided while maintaining the molding accuracy of the joint surface.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or Example 1, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment or example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the above-described embodiment, the wife formwork 2 and the main body formwork 3 are connected via the connection frame 5. However, the present invention is not limited to this, and the bolt holes 22,. The main body mold 3 can also be connected directly to the mold 2. Further, the connection frame 5 can be integrally formed with the wife mold 2.

  In addition, a bridge girder structure has been described as an example of a long structure, but the present invention is not limited to this, and a long structure such as a submerged tunnel or tower structure such as a tower is configured. The present invention can also be applied to precast segments.

  Furthermore, the number and position of the protrusions 4... Provided on the mold surface 2 a and 2 b of the wife mold 2 shown in the embodiment or the example, and the number and shape of the enlarged portions 42. However, it is not limited to this, and can be set arbitrarily.

  Furthermore, depending on the strength of the adhesive 9 and the size of the prestress to be introduced, it is not necessary to form the enlarged hole portion 1b by the protrusion 4, and other forms of shear keys can be applied or shear keys can be omitted. You can also.

It is the perspective view which showed the structure of the wife formwork used for manufacture of the precast segment of the best embodiment of this invention, a main-body part formwork, and a connection frame. It is the perspective view which showed the condition which arrange | positions the formwork diverted in order to manufacture the precast segment of a back | latter. It is sectional drawing which looked at the cross section of the web of the precast segment produced previously in the same direction as the AA line direction of FIG. It is explanatory drawing explaining each process of the manufacturing method of a precast segment. It is sectional drawing which looked at the structure of the junction part between precast segments in the same direction as the BB line direction of FIG. It is a side view explaining the manufacturing method of the precast segment of Example 1. FIG. It is sectional drawing which looked at the structure of Example 1 in the same direction as the AA line direction of FIG. It is sectional drawing which looked at the structure of Example 1 in the same direction as the CC line direction of FIG. 6 is a cross-sectional view illustrating a configuration of Example 2. FIG.

Explanation of symbols

1,1A to 1D Precast segment 2 Wife mold 2A First wife mold 2B Second wife mold 2a First mold surface 2b Second mold surface 21 Equal thickness plate (plate-like member)
22 Bolt hole (connecting means)
3,13 Main body part formwork 4 Projection part 41 Linear part 42 Enlarged part 5, 12 Connection frame (connection means)

Claims (6)

A wife formwork used for the production of a precast segment constituting a long structure by being joined together,
Formed on the both sides of the equal thickness plate-like member is a mold surface of the same shape for forming the joint surface of the precast segment, and the precast segment in the direction intersecting the surface at the edge of the mold surface A wife formwork characterized in that connection means for connecting the body surface to the body part formwork to be molded is provided.
  The mold surface formed on both surfaces of the plate-like member has a protruding portion having a linear portion and an enlarged portion, one end of which extends to the edge of the mold surface, symmetrical to the plate-like member. The wife formwork according to claim 1, wherein the wife formwork is provided.   The connection frame for forming a part of the surface of the precast segment that intersects the formwork surface as the connection means extends from the formwork surface in the main body formwork direction. Or the wife formwork of 2. In the manufacturing method of the precast segment using the wife formwork of any one of Claims 1 thru | or 3,
The main body mold is connected to the connecting means with the wife mold as the first wife mold, and the second mold is connected to the end of the main body mold opposite to the first wife mold. Connected as a wife formwork, cast a cement-based mixed material into a space surrounded by the first wife formwork, the second wife formwork and the main body formwork to form a precast segment, After the material is cured, the second wife mold and the main body mold are removed, and the main mold and the mold on the mold surface of the first wife mold on which the precast segment is not molded. A method for producing a precast segment, wherein a plurality of precast segments are produced by connecting a second wife formwork and placing a cement-based mixed material repeatedly. In the manufacturing method of the precast segment using the wife formwork according to claim 3,
The body mold is connected to the connection frame with the wife mold as the first wife mold, and the wife mold is secondly attached to the end of the body mold opposite to the first wife mold. Connected as a wife formwork, cast a cement-based mixed material into a space surrounded by the first wife formwork, the second wife formwork and the main body formwork to form a precast segment, After the material has hardened, the second end formwork and the main body part formwork are removed from the mold, and the main body part is attached to the connection frame on the formwork surface on the side where the precast segment of the first end formwork is not formed. Repeatedly connecting the mold frame at a predetermined inclination and connecting the second wife mold frame to the end of the main body mold frame opposite to the first wife mold frame and placing the cement-based mixed material. Precast segments characterized by producing multiple precast segments Fabrication method of placement. As the cementitious mix materials, compressive strength 150 N / mm ² or more, flexural tensile strength 25 N / mm ² or more, split Tensile strength using a fiber reinforced cementitious composite material with 10 N / mm ² or more mechanical properties The method for producing a precast segment according to claim 4 or 5.

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