JP6695104B2 - Method of manufacturing tilt culvert - Google Patents

Description

The present invention relates to a method of manufacturing a tilt culvert .

  Conventionally, for example, concrete products such as box culverts are usually laid in parallel in a straight line by joining vertical surfaces of end faces, but in addition to that, concrete products may be laid along a certain curve. ..

  In this case, the end surface corresponding to the joint of the concrete products to be continuously laid is formed to have an inclination angle in plan view like the concrete product shown in Patent Document 1, and the end surfaces having the inclination angles are joined to each other to form a predetermined curve. Lay concrete products so that

  In order to manufacture a concrete product whose end face has an inclination in plan view with a formwork, when forming a concrete product by the formwork, the formwork of which one or both end faces is formed has an inclination angle in plan view. It is necessary to make the formwork such that

  When a mold having such an end face inclination angle is used as a mold for a box culvert, as shown in FIGS. 7A to 7C, an outer frame 100 having an upper opening formed in a square shape for the box culvert. And a mold 102 composed of an inner frame 101 housed in an outer frame 100 in a state where the peripheral wall thickness d of the culvert is held in the circumferential direction.

  First, an end face partition plate 103 for forming an end face of a box culvert on one end face or both end faces thereof is fixed at an inclination in the outer frame 100, and an inner frame insertion insert formed in the center of the end face partition plate 103. The inner frame 101 is inserted into the window 104. 7A shows a state before the inner frame is inserted, FIG. 7B shows a state in which the inner frame is inserted into the outer frame, and FIG. 7C shows FIG. 7B. It is the figure which showed the state of () by planar view.

  In this way, the outer frame 100, the inner frame 101, and the end face partition plate 103 having an inclination angle form a frame space 105 for box culvert molding, and concrete is poured into the culvert space from above, and after curing and curing, demolding is performed. Mold to form a box culvert.

Japanese Patent Laid-Open No. 07-137023

  Although the box culvert with the end face inclination is formed as described above, at this time, the work of assembling the rectangular frame-shaped end face partition plate having the central insertion window into the outer frame with the inclination in order to form the end face inclination formwork is performed. It costs.

FIG. 8 is a plan view in which a state in which the end face partition plate 103 is arranged in the outer frame 100 is partially omitted. As shown in FIG. 8, in the assembling work, the rubber packing 106 is attached to the peripheral edge of the rectangular frame-shaped end face partition plate 103 in advance, and it is vertically lowered into the outer frame 100 of the upper opening as it is, and then the partition plate is removed. The slanted fitting is performed between the inner walls of the outer frame 100 in a state of being slanted at a predetermined slant angle.

At this time, the rubber packing 106 to be closely adhered to the inner wall surface of the conventional outer frame 100 has a substantially trapezoidal shape in which half is a square shape and the other half is a triangle shape. The point and the pointed tip of the triangle, that is, only the corner ridge line is in contact with the inner wall surface of the outer frame 100 (see FIG. 8). Because the end face partition plate 103 is fitted to the outer frame 100 at an inclination, the outer end face of the rubber packing 106 is inclined with respect to the inner wall surface of the outer frame 100 and abuts only on the corner ridge line of the outer end edge. This is because it is not possible to make surface contact with the outer end surface.

  As described above, since the outer end surface ridge line of the rubber packing 106 is basically formed at a right angle to the end surface partition plate 103, when the end surface partition plate 103 is positioned in the tilt direction, the outer end surface 107 of the rubber packing 106 is outside. The vertical inner wall surface of the frame 100 is eccentrically abutted and does not come into a surface contact state, but a line contact state of a corner ridge.

In the conventional manufacturing method of the inclination culvert, the outer end surface 107 of the rubber packing 106 is asymmetrically contacted as described above, the sealing function between the outer packing inner surface and the outer inner wall surface is deteriorated, and the cement is removed from the line contact gap of the rubber packing 106. When the paste leaks, unevenness or a junker is generated on the inclined end surface of the concrete product, and repair work is required to remove it, and when a large gap occurs between the line contacts of the rubber packing 106, There was the drawback that so-called burrs protruded at the ends of the concrete product and required a great deal of effort to cut it off.

In order to eliminate the drawbacks of the rubber packing 106 in the conventional inclination culvert manufacturing method, there is a method in which the outer surface of the rubber packing 106 is previously formed at a certain angle so as to obliquely contact the inner wall surface of the outer frame. The inclination angle of the plate 103 is not always constant, and the manner of curve changes variously depending on the radius angle of the curve point where the box culvert with the end surface inclination angle is laid. Therefore, the above-mentioned drawbacks cannot be solved by the conventional method of manufacturing the tilt culvert using the packing structure .

The present invention is configured so that an inclination culvert is manufactured by using three frame forming bodies of an outer frame 20, an inner frame 21, and an inclination partition plate 23. Moreover, the outer frame 20 is a rectangular tubular frame. The inner frame 21 is configured so that it can be inserted into the outer frame 20 having a rectangular tubular shape with a certain distance corresponding to the wall thickness of the culvert, and the tilting partition plate 23 is inserted from the central through hole 24. The rectangular frame body is formed so that the inner frame 21 is inserted therethrough, and when the tilt culvert is formed, it is configured as an end face partition plate for obliquely forming the culvert end face. While the packing main body 10 is fitted, the packing main body 10 has a fitting concave portion for fitting the peripheral edge of the tilt partition plate 23 on one side and a variable surface portion on the other side, and the variable surface portion is a non-flat concave surface. When the inclination partition plate is obliquely fitted and stored in the outer frame 20 of the concrete product formwork, the variable surface portion of the packing body 10 is crimped to the inner wall surface of the outer frame 20 to form a concave surface of the variable surface portion and Odd stress is applied to the acute-angled projecting portion at the tip of the variable surface portion, and the entire variable surface portion is deformed from the concave surface to a substantially flat surface and is crimped to the inner wall surface of the outer frame 20 in the surface contact state as much as possible to form the original concave surface Is formed into a substantially flat surface by performing the sealing function of the packing main body 10, and thereafter, is formed by the outer frame 20, the inner frame 21, and the inclination partition plate 23 from above the outer frame 20 that is open upward. It is intended to provide a method for manufacturing an inclination culvert, which is characterized in that the inclination culvert is manufactured by placing concrete in the mold space 25, curing and hardening, and then removing the mold.

  Further, the concave surface in the variable surface portion is composed of a base surface along the thickness direction of the tilt partition plate and a tilted surface rising from the base surface and tilted, and the tip of the tilted surface is formed as an acute angle protrusion. Have.

  The packing body is also characterized in that it is made of an elastomer.

  According to the invention of claim 1, since the fitting concave portion is formed on one side of the packing body and the variable surface portion is formed on the other side, and the variable surface portion is formed as a concave surface, the packing body is inserted through the fitting concave portion. It can be securely attached to the outer peripheral edge of the tilt partition plate.

  In this state, the tilting partition plate with packing is obliquely fitted and stored in the outer frame of the concrete product formwork. At this time, if the variable surface portion of the packing body is crimped to the inner wall surface of the outer frame, the variable surface portion is formed into a concave surface. The entire variable surface portion deforms from the concave surface to a substantially flat surface.

  Thus, as the variable surface portion is deformed from the initial concave surface to the substantially flat surface shape, the variable surface portion becomes closer to the flat surface and is crimped to the inner wall surface of the outer frame as close to surface contact as possible.

  In this way, the sealing effect between the packing main body and the inner wall surface of the form is improved to such an extent that the variable surface portion comes into surface contact with the inner wall surface in a state of being close to a flat surface, and the adhesiveness of the packing main body can be improved, and the cement paste is It is possible to prevent leakage from the packing.

  Further, according to the invention of claim 2, since the variable surface portion is composed of the base surface and the inclined surface, the inclined surface protrudes from the base surface to form an acute angle protrusion, and the variable surface portion is deformed by a flat shape. This has the effect of making it possible to expose a larger surface contact state at the time of crimping with the inner wall surface of the outer frame and further improve the close contact with the outer frame.

  Furthermore, since an acute angled projection is formed by projecting the inclined surface of the variable surface section from the base surface, the inclined surface is connected to the concrete pouring side so as to connect the acute angled projection and the end of one side surface of the fitting recess. Since it is formed, the corners of the concrete product that is hardened and completed after pouring the concrete have the effect of being chamfered.

  According to the third aspect of the present invention, since the packing main body is made of a resinous elastomer, the variable surface portion is easily deformed, and the hardness is adjusted so that a constant hardness can be maintained, so that the cement paste There is an effect that the leak pressure can be surely blocked.

It is sectional drawing which showed the structure of the packing main body which concerns on a present Example. It is a perspective view showing the composition of the packing body concerning this example. It is explanatory drawing which showed the structure of the outer frame and the inner frame. It is explanatory drawing which showed the structure of the inclination partition plate. It is explanatory drawing which showed the behavior of the packing main body when installing an inclination partition plate in an outer frame. It is explanatory drawing which showed the state of the packing main body when the inclination partition plate is installed in an outer frame. It is explanatory drawing which shows the manufacturing process of an inclination culvert. It is explanatory drawing of a prior art.

The present invention provides a method of manufacturing an inclination culvert using a packing structure mounted on the peripheral edge of an inclination partition plate used for forming an end surface of a concrete product formwork .

  Among them, as a characteristic point of the present invention, one side part of the packing body is formed with a fitting concave part to be fitted to the peripheral edge of the tilt partition plate, and the other side part of the packing body is provided with a concrete product formwork. Form a variable surface part that can be in surface contact when crimping with the inner wall surface of the concrete surface.The variable surface part is formed into a concave surface with respect to the inner wall surface of the concrete product formwork, and the tip of the concave surface is formed into an acute cross section. There are some points.

  Further, the concave surface in the variable surface portion may be composed of a base surface along the thickness direction of the tilt partition plate and a tilted surface that rises and tilts from the base surface, and the tip of the tilted surface may be formed as an acute-angled projection.

  Further, the packing body may be made of an elastomer. The above-described conventional rubber packing 106 has various problems as described below, and the above-described configuration can solve these problems.

  That is, since the conventional rubber packing 106 is soft, when it is mounted on the end face partition plate 103 and concrete is placed as shown in FIG. It was Further, it is possible to offset the flexibility by forming the rubber packing 106 itself to be thicker and prevent the end surface partition plate 103 from coming off due to deformation, but the rubber packing 106 itself becomes large. There is a problem that the cost required for the rubber packing 106 itself increases.

  Further, the rubber packing 106 lacks flexibility even if it is too hard, which may lead to leakage of the cement paste.

  Furthermore, since the conventional rubber packing 106 lacks the restoring force after the pressure is released, even if it is removed from the end face partition plate 103 after being used for concrete molding, it remains in a deformed state and can be reused. There wasn't. In particular, when steam curing that accelerates the hardening reaction of a concrete product is performed, there is a problem that the restoring force further decreases due to the influence of heat.

  On the other hand, if the packing main body is made of an elastomer as a material as in the present invention, since it has appropriate hardness and flexibility, it is possible to reliably prevent the leakage of the cement paste. Further, the elastomer is excellent in resilience, and it is possible to retain resilience to the extent of being reusable not only when heat is not applied but also when steam curing is performed.

  The material of the elastomer itself is not particularly limited, and while having flexibility as an essential function, it is hard to be denatured with respect to heat generated during steam curing or hardening performed to promote concrete hardening, Any material that does not easily cause shape deformation due to concrete load may be used.

As such an elastomer, for example, a material having one or more physical properties selected from the following (A) to (H) can be adopted. The MFR is a value at 230 ° C. and 21.2 N, and the compression set is a value at 70 ° C. for 22 hours.
The range of (A) Duro hardness A (ISO 7619-1) is 40 to 80, and more preferably 70 to 88.
(B) The range of MFR (ISO 1133) is 0.2 to 17 g / 10 min, more preferably 6 to 17 g / 10 min.
(C) The density (ISO 1183) range is 1.1 ± 0.2.
(D) The predetermined elongation tensile stress (100% elongation) (ISO 37) is in the range of 0.6 to 4.4 MPa, and more preferably 2.0 to 4.4 MPa.
(E) The tensile stress at break (ISO 37) is 5 to 11 MPa, more preferably 9 to 11 MPa.
(F) The elongation at break (ISO 37) is 750 to 850%, and more preferably 750 to 800%.
(G) The tear strength (ISO 34) range is 19 to 41 N / mm, and more preferably 30 to 41 N / mm.
(H) The range of compression set (ISO 815) is 35 to 64%, more preferably 48 to 64%.

  Specific examples of the material include styrene-based material, olefin-based material, polyester-based material, polyurethane-based material, and the like, and among them, styrene-based elastomer is preferable.

  By using such an elastomer, the thickness required to achieve the required hardness can be reduced, so that it can be deformed more flexibly than the conventional thick rubber packing. Sufficient crimping due to contact can be achieved, the leakage of cement paste can be steadily prevented, and the chamfering of concrete products after demolding can be made clean. That is, the packing of the present invention can be provided with appropriate flexibility, durability and resilience, and can exhibit a solid sealing function.

  The present invention is based on the above contents, and embodiments of the present invention will be specifically described below with reference to the drawings.

1 and 2 are explanatory views showing a packing structure used in a method for manufacturing a tilt culvert according to the present invention . A concrete product form, for example, a culvert whose end face is tilted in plan view (hereinafter, tilt culvert). 3) as an example, as shown in FIG. 3A, an outer frame 20 formed of a hollow rectangular tubular frame is obliquely formed in FIG. 4 to form a culvert end face. The tilt partition plate 23 shown in FIG.

  In the tilting partition plate 23, an inner frame 21 (see FIG. 3B), which is a rectangular frame similar to the outer frame 20, has an insertion hole 24 having a size large enough to be inserted as a nest. The tilt partition plate 23 is obliquely fitted and housed in the outer frame 20 to define the end surface of the tilt culvert, and functions similarly to the partition mold, that is, the end surface partition plate 103 described above.

  As shown in FIG. 4, the packing main body 10 having the packing structure of the present invention is attached to the periphery of the tilt partition plate 23.

  The packing body 10 is formed in the shape of a long string that can be fitted around the entire periphery of the tilt partition plate 23, or at least both side ends (see FIG. 2A). As shown in the drawing, a fitting groove 11 having a recess for holding the thickness of the tilt partition plate 23 is formed on one side, and one side wall 12a of the side walls of the fitting groove 11 is a concrete pouring side. A side wall 12b is provided on the non-casting side B, that is, on the opposite side, and is extended to a length about 3 times (3h) the length h of the side wall 12a. The mounting strength of the packing main body 10 is increased so that the surface contact area with 23 is as large as possible.

  A variable surface portion 13 is formed on the other side portion of the packing body 10. The variable surface portion 13 is formed as a concave surface with respect to the outer frame inner wall surface 20a.

  That is, as shown in FIG. 2C, the outer surface of the other side of the packing body 10 opposite to the fitting groove 11 is a base surface 13 a formed in a direction orthogonal to the fitting groove 11, An inclined surface 13b is formed continuously from the surface 13a toward the concrete pouring side A and inclined upward.

  The variable surface portion 13 of the packing body 10 is configured by the concave surface including the base surface 13a and the inclined surface 13b. Moreover, the acute-angled projection 14 is formed at the tip of the inclined surface 13b, and the acute-angled projection 14 is formed integrally with the side wall 12a of the fitting groove 11. That is, the acute-angled projection 14 has an acute-angled projecting edge whose tip is composed of an outer surface and an inner surface, the outer surface having an acute angle constitutes the inclined surface 13b of the variable surface portion 13, and the inner surface is the longitudinal direction of the fitting recess. It forms a continuous surface integrally with the other side wall 12b.

  Therefore, when the stress on the inner wall surface 20a of the outer frame is applied to the acute-angled projection 14, that is, the opening stress is applied to the concave surface, the acute-angled projection 14 becomes in the concave surface expanding direction, and the bending (bending) stress is applied to the fitting groove 11. It is possible to perform close contact deformation without absorbing excessive load on the packing body 10 by absorbing it at the base portion of the other side wall 12b of the longitudinal direction.

  Next, the mechanism in which the packing main body 10 is in surface contact with the outer frame inner wall surface 20a in the state where the packing main body 10 is mounted on the tilt partition plate 23 to perform a complete sealing function will be described in detail with reference to FIGS.

  When the tilt partition plate 23 with the packing body 10 mounted therein is housed in the outer frame 20 at a tilt angle, shear stress is applied so that the tilt partition plate 23 comes into contact with the tilt direction partition plate 23 in a certain direction from the center, or from the outside. External pressure is applied diagonally to fit the outer frame 20.

  By doing so, the inclined surface 13b of the variable surface portion 13 of the packing body 10 slides along the outer frame inner wall surface 20a from the state shown in FIG. 5 (a) to the state shown in FIG. 5 (b). As the inclined surface 13b is deformed in the flat direction, the concave surface is opened and flattened, and as shown in FIG. 6, the surface contact is brought into close contact with the outer frame inner wall surface 20a.

  Therefore, the contact area is expanded correspondingly and the sealing function is enhanced.

  In particular, the concave inclined surface 13b forms the outer surface of the acute-angled protrusion 14, and the inner side surface base of the acute-angled protrusion 14 is integrally continuous with the one side wall 12a of the fitting groove 11, so that the acute-angled protrusion 14b is formed. The portion 14 is easily deformed along the outer frame inner wall surface 20a, and the concave surface of the variable surface portion 13 of the packing body 10 is more easily flattened, and the adhesion of the packing body 10 to the outer frame inner wall surface 20a is further improved.

  As described above, in the packing body 10 of the present invention, a concave surface is formed on the opposite side of the fitting groove 11 that is fitted to the peripheral edge of the inclination partition plate 23, and the concave surface is the inner wall surface of the mold (outer frame inner wall surface 20a). When it is pressed and deformed, the concave surface is deformed to be as flat as possible. In particular, this flat deformation is performed on the inclined surface 13b of the concave surface, that is, the acute angle projecting portion 14, so that the packing main body 10 is not It is possible to prevent the cement paste from leaking to the non-placing side B through the packing body 10 due to the surface contact as much as possible.

  In addition, the material of the packing body 10 is Lavalon (registered trademark) SJ8400 manufactured by Mitsubishi Chemical Co., Ltd., which is a styrene-based material, and has hardness and appropriate flexibility as compared with a conventional rubber packing material. However, it has excellent durability. This Lavalon SJ8400 has a Duro hardness A (ISO 7619-1) of 79, an MFR (ISO 1133) of 9.0 g / 10 min, a density (ISO 1183) of 1.1, and a predetermined tensile elongation. The stress (ISO 37) is 2.5 MPa, the tensile stress at break (ISO 37) is 10 MPa, the elongation at break (ISO 37) is 800%, and the tear strength (ISO 34) is 35 N / mm and compression set (ISO 815) 55%.

Next, in the process of manufacturing the tilt culvert by the mold, a method of manufacturing the tilt culvert by the mold using the packing body 10 in the tilt culvert manufacturing method of the present invention will be described.

  Generally, a formwork is required to produce a concrete product. In the manufacture of the tilt culvert, three mold components including an outer frame 20, an inner frame 21, and a tilt partition plate 23 are used as molds.

  As shown in FIG. 3A, the outer frame 20 is formed of a rectangular tubular frame body. Further, as shown in FIG. 3 (b), the inner frame 21 is configured to be inserted into the outer frame 20 having a rectangular tubular shape with a fixed interval (corresponding to the inner thickness of the culvert) inserted therein. Has a shape similar to the inner surface of the outer frame.

  As shown in FIG. 4, the tilt partition plate 23 is a plate body having a through hole 24 formed in the center so that the inner frame 21 penetrates, and is used as an end surface partition plate to form the end surface of the tilt culvert obliquely. Is what you use.

  When using the tilt partition plate 23 for the outer frame 20, as shown in FIG. 7A, the tilt partition plate 23 is obliquely fitted and stored in the outer frame 20 in a plan view. Moreover, the packing main body 10 of the present invention is preliminarily fitted to the peripheral edge of the inclination partition plate 23, and in particular, the outer surface of the packing main body 10 is formed with a concave surface as a variable portion, so that the outer frame 20 of the outer frame 20 is formed. The inner wall surface 20a of the outer frame is easily crimped, and the concave surface of the packing body 10 is deformed in the flat direction as much as possible, and the sharp-angled projection 14 at the tip of the concave surface is strongly pressed against the inner wall surface 20a of the outer frame. The sealing function as a packing can be improved.

  After the slanting partition plate 23 is obliquely housed and fitted in the outer frame 20 as described above, the inner frame 21 is inserted into the outer frame 20 as shown in FIGS. A frame 22 is formed, concrete is poured from above the outer frame 20 that is open upward into a mold space 25 formed by the outer frame 20, the inner frame 21, and the tilt partition plate 23, and is cured and cured, and then demolded. To produce the desired tilt culvert.

  As a mode of placing concrete in the outer frame 20, as described above, the outer frame 20 is horizontally mounted horizontally, the upper side wall of the outer frame 20 is opened, and the tilt partition plate is placed from above. 23 is lowered to be housed and fitted in the outer frame 20, and then the inner frame 21 is inserted into the through hole 24 at the center of the inclination partition plate 23 to form a mold, and the upper frame of the outer frame 20 is opened. Place concrete.

  Further, as another concrete pouring form, a rectangular cylindrical outer frame is vertically placed vertically, and an inclination partition plate and an inner frame are inserted and assembled in the outer frame to construct concrete from the vertical direction. There is a method of setting.

  Lastly, the above description of each embodiment is an example of the present invention, and it goes without saying that various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention. is there.

10 packing body 11 fitting groove 12a one side wall 12b other side wall 13 variable surface part 13a base part surface 13b inclined surface 14 acute angle projection 23 inclination angle partition plate 25 formwork space

Claims (3)

It is configured to manufacture an inclination culvert using three formwork components of an outer frame 20, an inner frame 21, and an inclination partition plate 23.
Moreover, the outer frame 20 is composed of a rectangular tubular frame body,
The inner frame 21 is configured so that it can be inserted into the outer frame 20 having a rectangular tubular shape while maintaining a constant interval corresponding to the wall thickness of the culvert,
The tilt partition plate 23 is a rectangular frame body in which the inner frame 21 is inserted through the central through hole 24, and an end face partition plate for obliquely forming the culvert end face when molding the tilt culvert. So that
The packing main body 10 is fitted on the periphery of the inclination partition plate 23, and
The packing main body 10 has a fitting recess for fitting the peripheral edge of the tilt partition plate 23 on one side, and a variable surface part on the other side. The variable surface part is formed as a concave surface that is not flat. The variable surface portion of the packing main body 10 is crimped to the inner wall surface of the outer frame 20 when it is obliquely fitted and stored in the outer frame 20 of the product form frame, so that the concave surface of the variable surface portion and the acute-angled projection of the tip end thereof have an eccentric stress. As a result, the entire variable surface portion is deformed from the concave surface to a substantially flat surface, and is crimped to the inner wall surface of the outer frame 20 in a surface contact state as much as possible, so that the variable surface portion is deformed from the original concave surface to a substantially flat surface. Configured so that the sealing function of the packing body 10 is fulfilled,
After that, concrete is poured from above the outer frame 20 that is open upwards into the mold space 25 formed by the outer frame 20, the inner frame 21, and the tilt partition plate 23 to cure and harden it, and then demolding the tilt angle. A method for manufacturing a tilt culvert, which comprises manufacturing a culvert. The concave surface in the variable surface portion is constituted by a base surface along the thickness direction of the tilt partition plate 23 and a rising tilt surface tilted from the base surface, and the tip of the tilt surface is formed as an acute-angled projection. Item 2. A method for manufacturing a tilt culvert according to Item 1. Packing main body 10, a manufacturing method of the inclination Calvert according to claim 1 or claim 2, characterized by being configured elastomeric as the material.

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