JP2018204286A - Concrete form - Google Patents

Abstract

To provide a concrete form with which it is easy to secure a joint area between an upper flange of a main steel girder and a precast floor slab.SOLUTION: A concrete form includes: a mounting part 12 attached to a lower surface 100A of a precast floor slab 100 via an anchor 12B attached to the lower surface 100A of the precast floor slab 100; and a concrete form body 14 arranged along an end part 102A1 of an upper flange 102A in a direction orthogonal to the longer direction of a main steel girder 102 so as to be capable of damming a filler filled on the upper surface of the upper flange 102A so that it does not flow out from the upper surface of the upper flange 102A. It is also possible to not have a part in contact with the upper surface of the upper flange 102A of the main steel girder 102 in a state of being arranged at a position for filling the filler on the upper surface of the upper flange 102A of the main steel girder 102.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a formwork used when a precast floor slab is attached to a steel main girder and installed, and more specifically, a precast floor slab is disposed between a lower surface of the precast floor slab and an upper surface of an upper flange of the steel main girder. It is related with the formwork used when filling fillers, such as mortar, on the upper surface of the said upper flange of the said steel main girder in the state arrange | positioned at intervals.

  When installing the precast slab on the steel main girder, the bridge axis direction (steel) on the upper surface near the both ends of the upper flange of the steel main girder (near both ends in the direction perpendicular to the longitudinal direction of the steel main girder) The sole sponge is attached to the longitudinal direction of the main girder, and the upper surface of the upper flange of the steel main girder at the position corresponding to the bridge axial end of the precast floor slab to be installed is After mounting the sole sponge in the orthogonal direction), the precast floor slab is installed on the steel main girder, and the upper surface of the upper flange of the steel main girder, the lower surface of the precast floor slab, two rows of sole sponges in the bridge axis direction, and At present, a construction method is generally adopted in which mortar is filled in a space surrounded by two rows of sole sponges in a direction perpendicular to the bridge axis and the precast floor slab is integrated with the steel main girder. The sole sponge functions as a sealing material that prevents the mortar filled in the space on the upper surface of the upper flange of the steel main girder from leaking (for example, see Non-Patent Documents 1 and 2).

“Handbook of Construction of Steel Road Bridge”, Japan Road Association, April 30, 2015, p. 569-571 "Precast PC floor slab technical guideline for renewal", Prestressed Concrete Engineering Association, July 11, 2016, p. 142-143

  The present inventor has eagerly examined whether there is a problem in using the sole sponge when installing the precast floor slab on the steel main girder, and as a result, in the construction using the sole sponge, I found a problem.

  That is, since the sole sponge is attached to the upper surface of the upper flange of the steel main girder, the joint area between the upper flange of the steel main girder and the precast floor slab is reduced by the area in contact with the sole sponge. In particular, in the case of a steel main girder having a narrow upper flange, such as a composite girder, there is a concern that the effect of the reduction in the joining area becomes large and it becomes difficult to secure a sufficient joining area.

  This invention is made | formed in view of this problem, and makes it a subject to provide the formwork which is easy to ensure the joining area of the upper flange of a steel main girder, and a precast floor slab.

  The “joint area between the upper flange of the steel main girder and the precast floor slab” as used in the present application refers to a filler filled between the lower surface of the precast floor slab and the upper surface of the upper flange of the steel main girder. This is the area where the filler filled between the lower surface of the precast slab and the upper surface of the upper flange of the steel main girder directly contacts the upper surface of the upper flange of the steel main girder. .

  This invention solves the said subject with the following molds.

  That is, in the first aspect of the formwork according to the present invention, in the state in which the precast floor slab is disposed with a gap between the lower surface of the precast floor slab and the upper surface of the upper flange of the steel main girder, A mold that can be used when filling the upper surface of the upper flange of the main girder, and is attached to the lower surface of the precast slab via an anchor attached to the lower surface of the precast slab And a filler filled on the upper surface of the upper flange is disposed along the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main girder. A mold body main body that can be dammed so as not to flow out from above, and in a state where the steel main girder is disposed at a position for filling a filler on the upper surface of the upper flange. Main girder A mold, characterized in that it is possible not comprise a portion contacting with the upper surface of serial on the flange.

  Here, the “anchor attached to the lower surface of the precast floor slab” is not only the case where the anchor is directly embedded in the lower surface of the precast floor slab, but is also attached directly embedded in the lower surface of the precast floor slab. It is a concept including the case where it is attached to the lower surface of the precast slab by being attached to another member. For example, a female screw anchor is attached to the lower surface of the precast floor slab, and the anchor bolt attached to the female screw anchor and attached to the lower surface of the precast floor slab is “an anchor attached to the lower surface of the precast floor slab”. "include.

  The mounting portion has a long hole whose major axis direction is a direction orthogonal to the longitudinal direction of the steel main beam, and the anchor is inserted in the long hole. A frame may be configured.

  You may comprise the form of a said 1st aspect so that it may be previously attached to the lower surface of the said precast slab before carrying in to a construction site.

  In the state in which the mold according to the first aspect is disposed at a position when the filler is filled on the upper surface of the upper flange of the steel main girder, the mold body is arranged in the longitudinal direction of the steel main girder. The mold according to the first aspect may be configured so that it can be brought into contact with the end of the upper flange in a direction orthogonal to the first direction.

  The shape of the mold as viewed from the longitudinal direction of the mold in a state where the mold of the first aspect is disposed at a position when filling the upper surface of the upper flange of the steel main girder with a filler. The mold of the first aspect may be configured so that can be substantially L-shaped.

  You may comprise the formwork of a said 1st aspect so that the said formwork main-body part can be pressed to the edge part of the said upper flange of the direction orthogonal to the longitudinal direction of the said steel main girder with an elastic force.

  The first aspect is configured such that the mold main body portion can be rotated relative to the attachment portion with an axis substantially parallel to the longitudinal direction of the mold main body portion as a central axis of rotation. You may comprise the formwork.

  Here, the “longitudinal direction of the mold main body” is a normal case in a state where the mold according to the present invention is arranged at a position when filling the upper surface of the upper flange of the steel main girder. The direction is substantially parallel to the longitudinal direction of the steel main beam.

  The attachment portion is one plate-like body of a hinge having two plate-like bodies, and the other plate-like body of the hinge is attached to the formwork main body portion, and the hinge is rotated. The shaft is substantially parallel to the longitudinal direction of the formwork main body, and the attachment part and the formwork main body are relatively rotatable with the rotation axis of the hinge as a rotation center axis. In addition, the mold of the first aspect may be configured.

  The hinge includes a spring, and the first main body part can be pressed against the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main girder by the elastic force of the spring. You may comprise the formwork of the aspect.

  In a second aspect of the formwork according to the present invention, in the state where the precast floor slab is disposed with a space between the lower surface of the precast floor slab and the upper surface of the upper flange of the steel main beam, the steel main beam A mold used for filling a filler on the upper surface of the upper flange, and an attachment portion attached to the lower surface of the precast slab via an anchor attached to the lower surface of the precast slab And the filler filled on the upper surface of the upper flange flows out from the upper surface of the upper flange, and is disposed along the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main beam. A mold body main body that dams the steel main girder, but does not include a portion that contacts the upper surface of the upper flange of the steel main girder.

  The attachment portion has a long hole whose major axis is a direction orthogonal to the longitudinal direction of the steel main beam, and the anchor is inserted in the long hole. A frame may be configured.

  The mold body of the second aspect may be configured such that the mold body part is in contact with an end of the upper flange in a direction orthogonal to the longitudinal direction of the steel main girder.

  The form of the second aspect may be configured so that the form of the form as viewed from the longitudinal direction of the form is substantially L-shaped.

  The mold body of the second aspect may be configured such that the mold body body is pressed against the end of the upper flange in a direction orthogonal to the longitudinal direction of the steel main girder by elastic force. .

  The attachment portion is one plate-like body of a hinge having two plate-like bodies, and the other plate-like body of the hinge is attached to the formwork main body portion, and the hinge is rotated. You may comprise the mold of a said 2nd aspect so that an axis | shaft may be substantially parallel to the longitudinal direction of the said mold body main-body part.

  The hinge includes a spring, and the elastic main body presses the mold main body so as to be pressed against the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main beam. You may comprise the formwork of a 2nd aspect.

  According to the formwork according to the present invention, it is easy to ensure the joint area between the upper flange of the steel main girder and the precast slab. For this reason, even in the case of a steel main girder having a narrow upper flange, such as a composite girder, it is easy to ensure a sufficient joint area.

Perspective view schematically showing the status of replacement work of old and new floor slabs The perspective view which expands and shows the II section of FIG. FIG. 2 is a cross-sectional view taken along line III-III in FIG. 2 in a state in which the formwork according to the embodiment of the present invention is installed. FIG. 3 is an enlarged cross-sectional view of a portion IV. The perspective view which looked at the state which installed the formwork etc. which concern on embodiment of this invention so that a filler could be filled between the lower surface of a precast floor slab, and the upper surface of the upper flange of a steel main girder from diagonally downward The perspective view which expanded VI part of FIG. The flowchart which shows the work flow of an example of the construction using the formwork 10 which concerns on embodiment of this invention. The perspective view which looked at the state after finishing installation of the joint part 1st mold frame 40 and the joint part 2nd mold frame 42 required in order to perform a floor slab filling work from diagonally downward

  Hereinafter, with reference to drawings, a formwork concerning an embodiment of the present invention is explained in detail.

(1) Configuration of a formwork according to an embodiment of the present invention FIG. 1 is a perspective view schematically showing a situation of replacement work between old and new floor slabs, and FIG. 2 is an enlarged perspective view showing a portion II in FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 in a state in which the formwork according to the embodiment of the present invention is installed, and FIG. 4 is an enlarged cross-sectional view of the IV part of FIG. Further, FIG. 5 shows a state in which the formwork or the like according to the embodiment of the present invention is installed obliquely from below so that the filler can be filled between the lower surface of the precast slab and the upper surface of the upper flange of the steel main girder. FIG. 6 is an enlarged perspective view of a portion VI in FIG. Since the formwork 10 according to the embodiment of the present invention is attached to the lower surface 100A of the newly-installed precast floor slab 100, it is not shown in FIGS. 1 and 2, which are perspective views as viewed obliquely from above.

  FIG. 1 schematically shows a state of construction in which the existing concrete floor slab 200 is removed and a new precast floor slab 100 is mounted on the steel main girder 102. However, the formwork according to the present invention is old and new. It can be applied not only to replacement work of floor slabs, but also to new bridge construction work. Although FIG. 1 shows the situation when the existing concrete floor slab 200 is lifted by the crane 202, the new precast floor slab 100 is also installed on the steel main girder 102 using the same crane 202. Can do.

  In addition, in the state where the newly installed precast floor slab 100 is laid on the steel main girder 102 as shown in FIGS. 1 and 2, it is between the lower surface 100A of the precast floor slab 100 and the upper surface of the upper flange 102A of the steel main girder 102. The distance is adjusted appropriately with a height adjusting bolt (not shown), a spacer (not shown) or the like so as to be an appropriate distance (specifically, for example, about 20 to 70 mm).

  The formwork 10 according to the embodiment of the present invention includes an attachment part 12 attached to the lower surface 100 </ b> A of the precast floor slab 100 and a formwork body part 14.

  As shown in FIG. 5, the formwork body 14 of the formwork 10 is located below the lower surface 100A of the precast floor slab 100, and its length is larger than the width of one precast floor slab 100 in the bridge axis direction. Slightly shorter. The reason that the length of the mold body 14 is slightly shorter than the width of one precast floor slab 100 in the bridge axis direction is that concrete is formed in the gap 100B between the precast floor slabs 100 adjacent in the bridge axis direction. This is a construction reason (to be described later in detail) that makes it easier to install a formwork used in a floor slab filling process. In the formwork according to the present invention, the length of the formwork body part may be appropriately changed according to the situation at the site, and the length of the formwork body part is determined from the width in the bridge axis direction of one precast floor slab. However, it is not essential to shorten it.

  The attaching part 12 has a role which attaches the formwork 10 which concerns on this embodiment to the lower surface 100A of the precast floor slab 100, and multiple are arrange | positioned along the longitudinal direction of the steel main girder 102. FIG. The arrangement pitch of the attachment portions 12 is not particularly limited as long as the mold frame 10 can be stably attached to the lower surface 100A of the precast floor slab 100, but the attachment portions 12 are specifically arranged to have an arrangement of about 1 m, for example. Arrange at the pitch.

  The attachment part 12 of the mold 10 according to the present embodiment is one plate-like body 16A of the two plate-like bodies 16A and 16B constituting the hinge 16. One plate-like body 16A of the hinge 16 is attached to the lower surface of the precast floor slab 100 by a female screw anchor 12A and an anchor bolt 12B embedded in the lower surface of the precast floor slab 100. It has become. The plate-like body 16A that is the attachment portion 12 is fastened with an anchor bolt 12B inserted into a long hole 16A1 provided in the plate-like body 16A1, and is attached to the lower surface of the precast floor slab 100 by the female screw anchor 12A and the anchor bolt 12B. ing.

  Since the major axis direction of the long hole 16A1 of the mounting portion 12 (plate-like body 16A) through which the anchor bolt 12B is inserted is a direction orthogonal to the longitudinal direction of the steel main beam 102, the mounting position of the mold 10 is set to the steel main beam 102. Can be finely adjusted in a direction orthogonal to the longitudinal direction of the.

  The attachment portion 12 of the mold 10 according to the present embodiment is one plate-like body 16A of the hinge 16, but the two plate-like bodies 16A and 16B constituting the hinge 16 are provided with the rotation shaft 16C of the hinge 16. It is relatively rotatable as a central axis of rotation.

  As shown in FIG. 6, the other plate-like body 16B of the two plate-like bodies 16A and 16B constituting the hinge 16 is attached to the formwork main body 14 with screws 16B1.

  Therefore, the attachment portion 12 and the formwork main body portion 14 can be relatively rotated with the rotation shaft 16C of the hinge 16 as the central axis of rotation, and the rotation shaft 16C of the hinge 16 is It is substantially parallel to the longitudinal direction of the mold body 14.

  The hinge 16 is provided with a spring 16D, and by the elastic force of the spring 16D, the end of the upper flange 102A of the steel main girder 102 with which the formwork main body 14 abuts (in the direction orthogonal to the longitudinal direction of the steel main girder 102). It is possible to press against the end 102A1 (see FIG. 4) of the upper flange 102A.

  The formwork main body 14 of the formwork 10 is in contact with the end 102A1 of the upper flange 102A of the steel main girder 102. The pressing force is determined by the magnitude of the elastic force of the spring 16D and the arrangement pitch of the attachment part 12. Moreover, it can be adjusted by fine adjustment of the position of the attachment portion 12 utilizing the long hole 16A1 of the attachment portion 12 (fine adjustment of the position in the direction orthogonal to the longitudinal direction of the steel main beam 102).

  As shown in FIGS. 3 to 5, the mold body 14 is a member disposed along the end 102 </ b> A <b> 1 of the upper flange 102 </ b> A in a direction orthogonal to the longitudinal direction of the steel main girder 102. The filler filled on the upper surface of the upper flange 102 </ b> A has a role of blocking the filler so as not to flow out from the upper surface of the upper flange 102 </ b> A.

  The mold body 14 is in contact with the end 102A1 of the upper flange 102A in a direction orthogonal to the longitudinal direction of the steel main girder 102, and the mold body 14 is connected to the upper surface of the upper flange 102A of the steel main girder 102. There are no parts to contact. Further, the hinge 16 including one plate-like body 16 </ b> A serving as the attachment portion 12 is not in contact with the upper flange 102 </ b> A of the steel main girder 102. Therefore, the mold 10 having the attachment part 12 and the mold body 14 does not include a portion that contacts the upper surface of the upper flange 102A of the steel main girder 102.

  The material of the mold body part 14 is not particularly limited as long as the filler filled on the upper surface of the upper flange 102A can play a damming role so as not to flow out from the upper surface of the upper flange 102A. As the formwork main body 14, for example, wood or a steel plate can be used.

  The formwork 10 includes an attachment part 12 and a formwork body part 14, but the arrangement state shown in FIGS. 3 to 6 (on the upper surface of the upper flange 102A of the steel main girder 102 is shown. The shape of the mold 10 viewed from the longitudinal direction (longitudinal direction of the steel main girder 102) is substantially L-shaped. For this reason, the attachment portion 12 is attached to the lower surface 100A of the precast floor slab 100, and the formwork main body portion 14 is brought into contact with the end portion 102A1 of the upper flange 102A in the direction orthogonal to the longitudinal direction of the steel main beam 102. It becomes easy to arrange the mold 10.

  When the formwork main body portion 14 abuts on the end 102A1 of the upper flange 102A in the direction orthogonal to the longitudinal direction of the steel main beam 102, the upper surface of the upper flange 102A of the steel main beam 102, the lower surface 100A of the precast floor slab 100, And the closed space 80 (refer FIG. 3 and FIG. 4) enclosed by the two rows of formwork main-body parts 14 arrange | positioned in contact with both edge part 102A1 of 102 A of upper flanges is formed. Both ends of the closed space 80 in the direction of the bridge axis (longitudinal direction of the steel main girder 102) (positions below both ends of the precast floor slab 100 in the direction of the bridge axis) are closed by the short side mold 30 (see FIG. 5). The closed space 80 is closed from the outside by the short side mold 30 in the bridge axis direction. The short side frame 30 is a plate-like body having the same length as the width of the upper flange 102A of the steel main girder 102 (width in the direction orthogonal to the longitudinal direction of the steel main girder 102), and closes the closed space 80 from the outside. The height in the state (refer FIG. 5) arrange | positioned so is a plate-shaped body higher than the height of the closed space 80. FIG.

  Further, as shown in FIG. 5, in the mold 10 according to the present embodiment, half of the hinge 16 protrudes from the mold body 14 so that another mold can be connected to both ends. . For this reason, the length of the mold body 14 is shorter than the width of one precast floor slab 100 in the direction of the bridge axis by the length of one hinge 16, and the mold 10 is made of a steel main girder. In a state where the filler is placed on the upper surface of the upper flange 102 </ b> A at the position where the filler is filled, a gap is generated on the outside of both ends of the formwork main body 14 by half the length of the hinge 16. In order to close this gap, the auxiliary mold body 14A, which is half the length of the hinge 16, is attached to the outside of both ends of the mold body 14 with a hinge 16 and screws 16B1.

  Therefore, the closed space 80 is formed on the upper surface of the upper flange 102A of the steel main girder 102, the lower surface 100A of the precast floor slab 100, and the two rows of the mold body main body 14, and the short side mold 30 and the auxiliary mold main body 14A. The space is enclosed and closed.

  As described above, the distance between the lower surface 100A of the precast floor slab 100 and the upper surface of the upper flange 102A of the steel main girder 102 is appropriately adjusted with a height adjusting bolt (not shown), a spacer (not shown), or the like. Since it is adjusted and set to an appropriate distance (specifically, for example, about 20 to 70 mm), the height of the closed space 80 is the same as the set appropriate distance (specifically, for example, 20 to 70 mm). About 70 mm).

  And the closed space 80 is filled with fillers, such as mortar, and the precast floor slab 100 and the steel main girder 102 are integrated. The filler for filling the closed space 80 can be used as long as the precast floor slab 100 and the steel main girder 102 can be sufficiently integrated. Specifically, for example, non-shrink mortar can be used.

  The formwork body part 14, the auxiliary formwork body part 14 </ b> A, and the short-side formwork 30 that close the closed space 80 from the side are all precast floor slabs 100 of the upper surface of the upper flange 102 </ b> A of the steel main girder 102. When the closed space 80 is filled with the filler, the entire upper surface of the upper flange 102A comes into contact with the filler. Therefore, by using the mold 10 according to the present embodiment, the joining area between the upper flange 102A of the steel main girder 102 and the precast floor slab 100 (the lower surface 100A of the precast floor slab 100 and the upper flange 102A of the steel main girder 102). It becomes easy to secure a bonding area through a filler filled between the upper surface and the upper surface.

  Further, when the closed space 80 is filled with the filler, the entire upper surface of the upper flange 102A comes into contact with the filler, so that the upper surface of the upper flange 102A does not come into direct contact with the atmosphere and is hardly corroded.

  The formwork 10 may be attached to the lower surface 100A of the precast floor slab 100 in advance before being brought into the field. In this case, the formwork body 14 is in a direction against the elastic force of the spring 16D (the hinge 16 is configured). In this fixed state, the precast floor slab 100 is placed on the steel main girder 102 in a fixed state. After the precast floor slab 100 is placed on the steel main girder 102, the adhesive tape or the like is removed, and the mold main body 14 is moved to the end 102A1 of the upper flange 102A of the steel main girder 102 by the elastic force of the spring 16D. The end of the upper flange 102A in the direction orthogonal to the longitudinal direction of the beam 102 is pressed and brought into contact. The mold 10 may be attached to the lower surface 100A of the precast floor slab 100 on site.

  Further, since the mold body 14 can be rotated about the rotation axis 16C of the hinge 16 which is an axis substantially parallel to the longitudinal direction of the mold body 14, the overall shape of the mold 10 Can be formed into a flat plate shape along the lower surface 100A of the precast floor slab 100. Even if the mold 10 is attached to the lower surface 100A of the precast floor slab 100 in advance before being carried into the construction site, By forming the flat plate shape along the lower surface 100 </ b> A of the precast floor slab 100, it is possible to prevent the mold 10 from being bulky during transportation when the precast floor slab 100 is carried into the construction site.

  If the formwork 10 is previously attached to the lower surface 100A of the precast floor slab 100 before being brought into the field, the formwork installation work at the site can be greatly reduced, and the formwork installation work at the worksite can be greatly reduced. Time can be greatly reduced.

  In the mold 10 according to the present embodiment, the pressing force with which the mold body 14 is in contact with the end 102A1 of the upper flange 102A of the steel main girder 102 is obtained by the elastic force of the spring 16D of the hinge 16. You may make it obtain the pressing force with which the formwork main-body part 14 contact | abuts the edge part 102A1 of the upper flange 102A of the steel main girder 102 by another means, without using the spring 16D. For example, by sticking an adhesive tape or the like in a range extending from the outer surface of the mold body 14 to the lower surface of the upper flange 102A, the mold body 14 contacts the end 102A1 of the upper flange 102A of the steel main beam 102. A pressing force may be obtained.

  Moreover, the formwork 10 which concerns on this embodiment can be removed from the precast floor slab 100 by removing the anchor bolt 12B after use, and the removed formwork 10 can be reused.

  In addition, the mold 10 according to the present embodiment includes an attachment portion 12 that is one plate-like body 16 </ b> A of the hinge 16 and a mold main body 14, and two forms of the mold main body 14 and the hinge 16 are provided. Although a member is used, the mold according to the present invention can be configured by a member in which an attachment part and a mold body part are integrally formed.

  As described above, the mold 10 according to the present embodiment has been described. However, the mold 10 according to the present embodiment has a filler between the lower surface 100A of the precast floor slab 100 and the upper surface of the upper flange 102A of the steel main girder 102. This is a mold used for filling, and another mold is used when placing concrete in the gap 100B between the precast floor slabs 100 adjacent to each other in the bridge axis direction (longitudinal direction of the steel main girder 102). Another formwork used when placing concrete in the gap 100B between the precast floor slabs 100 adjacent to each other in the bridge axis direction (longitudinal direction of the steel main girder 102) will be described later in “(2) Embodiment of the present invention. Will be referred to in the description of "Work flow of an example of construction using the formwork".

(2) Work flow of an example of construction using the formwork according to the embodiment of the present invention FIG. 7 is a flowchart showing an example of the work flow of the construction using the formwork 10 according to the embodiment of the present invention. The construction taken up as an example here is replacement work for old and new floor slabs, but as described above, the formwork 10 according to the embodiment of the present invention can also be applied to new construction work for bridges.

  First, the crane 202 (see FIG. 1) is installed at a position for lifting and removing the existing concrete floor slab 200 to be replaced (step S1), and the existing concrete floor slab 200 in the range of construction to be performed on that day is installed in the crane 202. Is lifted and removed (step S2). It is standard that the range of construction to be performed per day is about six sheets of precast floor slab 100.

  After the removal of the existing concrete floor slab 200 is completed, the remaining concrete suspended on the upper surface of the upper flange 102A of the steel main girder 102 in the range where the existing concrete floor slab 200 has been removed and the upper surface of the upper flange 102A are cleaned. (Step S3) Further, the displacement preventing member on the upper surface of the upper flange 102A of the steel main girder 102 is removed (Step S4).

  Then, prescribed coating is performed on the upper flange 102A of the steel main girder 102 (step S5), and the precast floor slab 100 is laid (step S6).

  When the laying of the precast slab 100 performed on that day is completed, the crane 202 is moved to the work position on the next work day (step S7). In the replacement work of old and new floor slabs, construction is often started from the center of the bridge. In this case, the direction in which the crane 202 is moved to the work position on the next work day is the backward direction of the crane 202.

  Judge whether the replacement of the old and new floor slabs has been completed for the range of replacement work of the old and new floor slabs (step S8), and if all the replacement of the old and new floor slabs has been completed, proceed to step S9, head stud 104 (see FIG. 3) is welded to the upper surface of the upper flange 102A of the steel main girder 102 (the position corresponding to the misalignment hole 100C of the precast floor slab 100), and the replacement of the old and new floor slabs has not been completed. Then, return to step S2 on the next work day and repeat the work of steps S2 to S7. It is standard to complete one cycle of steps S2 to S7 in one day.

  For the installation of the mold 10, the auxiliary mold main body 14A, and the short-side mold 30 according to the embodiment of the present invention (step S10), the precast floor slab 100 is laid in step S6, and then no shrinkage is performed in step S11. The mortar may be performed before the upper surface of the upper flange 102A of the steel main beam 102 is filled.

  Welding of the stud 104 with the head on the upper surface of the upper flange 102A of the steel main girder 102 (a position corresponding to the hole 100C for preventing the shift of the precast floor slab 100) (step S9), the mold 10, and the auxiliary mold body After the installation of 14A and the short-side formwork 30 (step S10) is completed, the non-shrink mortar is put into the closed space 80 on the upper surface of the upper flange 102A of the steel main girder 102 from the hole 100C for preventing slippage of the precast floor slab 100. Fill (step S11). The non-shrink mortar filled in the closed space 80 is filled up to a height (the same height position as the upper surface of the precast floor slab 100) to fill the hole 100C for preventing the precast floor slab 100 from slipping. The non-shrink mortar filled in the stopper hole 100C is integrally cured.

  When the predetermined curing period of the non-shrink mortar filled in the closed space 80 and the stopper hole 100C in step S11 has elapsed, the integration of the precast floor slab 100 and the steel main girder 102 is completed, and according to the present embodiment. The mold 10 finishes fulfilling the role as a mold for filling the filler between the lower surface 100A of the precast floor slab 100 and the upper surface of the upper flange 102A of the steel main girder 102.

  In subsequent steps S12 to S15, the gap 100B between the precast floor slabs 100 adjacent in the bridge axis direction is filled with concrete, and the precast floor slabs 100 adjacent in the bridge axis direction are integrated in the bridge axis direction. Although it is a process for performing a floor slab filling process (step S15) and is not directly related to the mold 10 according to the present embodiment, the processes of steps S1 to S11 and steps S12 to S15 Since a process is a process normally performed in a series of construction, the process of step S12-S15 is also demonstrated easily below.

  After the predetermined curing period of the non-shrink mortar filled in the closed space 80 in step S11, the auxiliary mold body 14A and the short mold 30 are removed (step S12), and the precast floor adjacent to the bridge axis direction is removed. FIG. 8 (after the installation of the joint part first mold 40 and the joint part second mold 42 necessary for performing the floor slab packing work is completed so as to cross the gap 100B between the plates 100. As shown in the perspective view seen from obliquely below, the joint second mold 42 is installed (step S13).

  The joint part second mold frame 42 includes a vertical plate-like portion 42A that comes into contact with the end 102A1 of the upper flange 102A of the steel main girder 102 and a bottom plate-like plate-like portion 42B that is disposed substantially parallel to the lower surface 100A of the precast floor slab 100. Is a mold having a substantially L-shaped cross section. The length of the vertical plate portion 42A is longer than the length of the bottom plate plate portion 42B by the length of the hinge 16, and both ends 42A1 of the vertical plate portion 42A are in the longitudinal direction of the vertical plate portion 42A (see FIG. 8) (the bridge axis direction in FIG. 8) is projected by half the length of the hinge 16, and both ends 42A1 of the vertical plate portion 42A are attached to the other plate body 16B of the hinge 16 with screws 16B1. Can do.

  The joint first mold 40 shown in FIG. 8 is a plate-like body along the lower surface 100A of the precast floor slab 100, and both ends in the bridge axis direction are adjacent to each other in the bridge axis direction by the anchor bolts 40A. It can be attached to the lower surface 100A of the plate 100, and can be installed so as to close the gap 100B between the precast floor slabs 100 adjacent in the bridge axis direction from below.

  After the installation of the joint part first mold 40 (step S14) and the installation of the joint part second mold 42 (step S13), the gap 100B between the precast floor slabs 100 adjacent in the bridge axis direction is made of concrete. Filling is performed, and floor slab filling is performed in which the precast floor slabs 100 adjacent to each other in the bridge axis direction are integrated in the bridge axis direction (step S15).

DESCRIPTION OF SYMBOLS 10 ... Formwork 12 ... Mounting part 12A ... Female thread anchor 12B ... Anchor bolt 14 ... Formwork main body part 14A ... Auxiliary formwork main body part 16 ... Hinge 16A ... One plate-like body 16A1 ... Long hole 16B ... Other plate-like body 16B1 ... Screw 16C ... Rotating shaft 16D ... Spring 30 ... Short side mold 40 ... Joint part first mold 40A ... Anchor bolt 42 ... Joint part second mold 42A ... Vertical plate-like part 42A1 ... End 42B ... Bottom plate Plate-like part 80 ... Closed space 100 ... Precast floor slab 100A ... Lower surface 100B ... Gap 100C ... Slip prevention hole 102 ... Steel main beam 102A ... Upper flange 102A1 ... End 104 ... Headed stud 200 ... Existing concrete floor slab 202 …crane

Claims (16)

In the state where the precast floor slab is disposed with a space between the lower surface of the precast floor slab and the upper surface of the upper flange of the steel main girder, the filler is filled on the upper surface of the upper flange of the steel main girder. A formwork that can be used for
Via an anchor attached to the lower surface of the precast floor slab, an attachment portion attached to the lower surface of the precast floor slab,
The filler filled on the upper surface of the upper flange is arranged along the end of the upper flange in a direction orthogonal to the longitudinal direction of the steel main girder so that the filler does not flow out from the upper surface of the upper flange. A mold body that can be dammed,
While comprising
In a state where the upper surface of the upper flange of the steel main girder is disposed at a position for filling with a filler, it is possible not to include a portion that contacts the upper surface of the upper flange of the steel main girder. And formwork.   The said attachment part has a long hole which makes the direction orthogonal to the longitudinal direction of the said steel main girder the major axis direction, and the said anchor has penetrated the said long hole, It is characterized by the above-mentioned. Formwork.   The formwork according to claim 1 or 2, wherein the formwork is attached in advance to a lower surface of the precast slab before being carried into a construction site.   In a state where the mold is disposed at a position when filling the upper surface of the upper flange of the steel main girder with the filler, the mold main body is arranged in a direction orthogonal to the longitudinal direction of the steel main girder. The mold according to any one of claims 1 to 3, wherein the mold can be brought into contact with an end of the upper flange.   In a state where the mold is disposed at a position when filling the upper surface of the upper flange of the steel main beam, the shape of the mold viewed from the longitudinal direction of the mold is substantially L-shaped. The mold according to claim 4, wherein the mold can be made.   The formwork according to claim 4 or 5, wherein the formwork body part can be pressed against an end of the upper flange in a direction orthogonal to a longitudinal direction of the steel main girder by an elastic force.   The said formwork main-body part can be rotated relatively with respect to the said attachment part by making the axis | shaft substantially parallel to the longitudinal direction of the said formwork main-body part into the center axis | shaft of rotation. The formwork in any one of 6.   The attachment portion is one plate-like body of a hinge having two plate-like bodies, and the other plate-like body of the hinge is attached to the formwork main body portion, and the hinge is rotated. The shaft is substantially parallel to the longitudinal direction of the formwork main body, and the attachment part and the formwork main body are relatively rotatable with the rotation axis of the hinge as a central axis of rotation. The mold according to any one of claims 1 to 6, which is characterized by the following.   The hinge includes a spring, and the mold main body can be pressed against the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main girder by the elastic force of the spring. 8. Formwork according to 8. In the state where the precast floor slab is disposed with a space between the lower surface of the precast floor slab and the upper surface of the upper flange of the steel main girder, the filler is filled on the upper surface of the upper flange of the steel main girder. A formwork used when
Via an anchor attached to the lower surface of the precast floor slab, an attachment portion attached to the lower surface of the precast floor slab,
It is arranged along the end of the upper flange in a direction perpendicular to the longitudinal direction of the steel main beam, so that the filler filled on the upper surface of the upper flange does not flow out from the upper surface of the upper flange. A mold body to be dammed in,
While comprising
The formwork characterized by not providing the site | part which contact | connects the upper surface of the said upper flange of the said steel main beam.   The said attachment part has a long hole which makes the direction orthogonal to the longitudinal direction of the said steel main girder the major axis direction, The said anchor has penetrated the said long hole, It is characterized by the above-mentioned. Formwork.   The said formwork main-body part is contact | abutted with the edge part of the said upper flange of the direction orthogonal to the longitudinal direction of the said steel main girder, The formwork of Claim 10 or 11 characterized by the above-mentioned.   The shape of the said formwork seen from the longitudinal direction of the said formwork is a substantially L shape, The formwork of Claim 12 characterized by the above-mentioned.   The formwork according to claim 12 or 13, wherein the formwork body is pressed against an end of the upper flange in a direction orthogonal to a longitudinal direction of the steel main girder by an elastic force.   The attachment portion is one plate-like body of a hinge having two plate-like bodies, and the other plate-like body of the hinge is attached to the formwork main body portion, and the hinge is rotated. The mold according to any one of claims 10 to 14, wherein the axis is substantially parallel to a longitudinal direction of the mold main body.   The hinge includes a spring, and the mold main body is pressed against the end of the upper flange in a direction orthogonal to the longitudinal direction of the steel main girder by the elastic force of the spring. The mold according to claim 15.

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