JP2019138004A - Manufacturing method of precast segment - Google Patents

Abstract

To provide a manufacturing method of a match cast method capable of manufacturing a precast segment easily and with high linear accuracy.SOLUTION: A manufacturing method includes: a step of producing a semi-finished product member 101 of a precast segment 1; a step of providing at least three protrusions 18 on one end surface 112a, and 113a in the bridge axis direction of an upper floor slab body 112 and a lower floor slab body 113; a step of arranging an adjacent precast segment 2 at a position where it abuts on at least the three protrusions 18 for use as a match cast gable formwork of the semi-finished product member 101; and a step of placing concrete or mortar into a gap L formed between the semi-finished product member 101 and the adjacent precast segment 2 to integrate with the semi-finished product member 101.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for producing a precast segment, and in particular, a plurality of upper floor slabs and lower floor slabs made of concrete, and provided at a distance from each other in the bridge axis direction, and a plurality of the upper floor slab and the lower floor slab are connected to each other. The present invention relates to a method for manufacturing a precast segment constituting a part of a bridge girder of a bridge girder provided with a web.

  Conventionally, when a concrete box girder bridge is erected, a precast segment method is widely used in which precast segments previously divided and manufactured in a factory or on-site yard are integrated with each other at a bridge point. When precast segments are manufactured using the short line method, the joint surfaces of prefabricated precast segments that have been manufactured in advance are used as the formwork for the joint surfaces of precast segments that are adjacent to each other. Generally, a match cast method that matches the above is adopted.

  Further, as a box girder, there is known a box girder comprising an upper floor slab and a lower floor slab made of concrete and a plurality of webs that are provided at intervals in the bridge axis direction and connect the upper floor slab and the lower floor slab to each other. (See Patent Document 1). As shown in FIG. 12, the box girder 51 described in Patent Document 1 is a continuous girder that is spanned between a plurality of piers 52 or abutments (not shown). As shown in FIG. 13, the box girder 51 includes an upper floor slab 53 that is disposed substantially horizontally to form a roadbed, a lower floor slab 54 that is disposed below the upper floor slab 53 and substantially parallel to the upper floor slab 53, and A pair of webs 55 that connect the upper floor slab 53 and the lower floor slab 54 to each other are provided, and the cross-sectional shape in the direction orthogonal to the bridge axis direction has a box shape. The upper floor slab 53 and the lower floor slab 54 are made of concrete, and the web 55 is made of a steel member or concrete.

  As shown in FIG. 14, the web 55 has a butterfly (butterfly) shape in which the length in the bridge axis direction gradually increases from the middle in the height direction toward the upper side 55a and the lower side 55b in a side view. The webs 55 adjacent to each other in the bridge axis direction are provided at a predetermined interval in the bridge axis direction. That is, the webs 55 adjacent to each other in the bridge axis direction are not joined to each other.

Japanese Patent No. 4005774

  When the precast segment of the box girder 51 described in Patent Document 1 is manufactured by the short line method using the match cast method, the mold for the upper floor slab arranged so as to surround the upper side 55a and the lower side 55b of the web 55 manufactured in advance. The concrete is placed in the frame 72 (FIG. 15) and the lower floor slab form 71 (FIG. 15), whereby the upper floor slab 53 and the lower floor slab 54 integrated with the web 55 are manufactured.

  Specifically, as shown in FIG. 15, the upper floor slab formwork and the lower floor slab formwork for forming one end surface in the bridge axis direction of the upper floor slab 53 and the lower floor slab 54, respectively. The bulkhead 61 for the plate and the bulkhead 62 for the lower floor slab are respectively positioned at predetermined positions by the upper floor plate support member 65 and the lower floor plate support member 66 attached to the bulkhead frame 64 fixed to the floor surface 63. Support with. Next, the pre-manufactured precast segment 67 that has been manufactured in advance is arranged at a position away from the bulkheads 61 and 62 so as to be used as the end form frame that forms the other end surface of the upper floor slab 53 and the lower floor slab 54 in the bridge axis direction. To do. At this time, the prefabricated precast segment 67 is bulked so that the newly produced precast segment has a design linearity (planar alignment, vertical alignment, and transverse alignment) in consideration of the upward movement with respect to the prefabricated precast segment 67. The heads 61 and 62 are arranged at predetermined positions with a predetermined posture. In order to make this possible, the pre-manufactured precast segment 67 is placed on a carriage 69 having a plurality of wheels for adjusting the plane position and a plurality of jacks for adjusting the height position and posture. Next, the lower floor slab form 71, the web 55, and the upper floor slab form 72 are arranged in that order between the bulkheads 61 and 62 and the pre-manufactured precast segment 67. The lower floor slab form 71 is placed on a carriage 69 so that the position and posture can be adjusted later. Then, concrete is placed in the lower floor slab form 71 and the upper floor slab form 72 to manufacture the lower floor slab 54 and the upper floor slab 53.

  However, in the conventional method for manufacturing a precast segment as described above, it takes time to arrange the pre-manufactured precast segment 67 in a predetermined position at a predetermined position. If an error occurs in the arrangement of the pre-manufactured precast segment 67 or the pre-manufactured pre-cast segment 67 is displaced at the time of placing concrete, the relative positional relationship between the pre-manufactured pre-cast segment 67 and the newly produced pre-cast segment is shifted. Arise. When such a deviation occurs, the linear accuracy of the box girder 51 decreases. To improve this, we measured the relative positional relationship between the two precast segments after placing concrete, and simulated the actual alignment (shape) when assembled precast segments were assembled. Therefore, it is necessary to correct the shape of the segment to be manufactured next, that is, the position and orientation of the pre-manufactured precast segment 67 forming the end form so that this error is reduced. This further complicates the production of the precast segment in the match cast method.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a manufacturing method of a match cast method capable of manufacturing a precast segment easily and with high linear accuracy.

  In order to solve the above problems, the present invention provides an upper floor slab (12) and a lower floor slab (13) made of concrete and spaced apart from each other in the direction of the bridge axis, and the upper floor slab and the lower floor slab are connected to each other. A method of manufacturing a precast segment (1) constituting a part of a bridge girder of a bridge girder having a plurality of webs (11) to be connected, the upper floor slab main body (112) constituting most of the upper floor slab, and A step of producing a semi-finished product member (101) of the precast segment in which a lower floor slab body (113) constituting a majority of the lower floor slab is integrated with the web; and the upper floor slab body and the lower floor slab body A step of providing at least three projections (18) on one end face (112a, 113a) in the bridge axis direction of the bridge, and being arranged adjacent to the semi-finished product member for use as a match cast wife formwork of the semi-finished product member Positioning the adjacent precast segment (2) or its semi-finished product member (102) in a position where it abuts against the at least three protrusions, and between the semi-finished product member and the adjacent precast segment or its semi-finished product member A step of placing concrete or mortar (M) in the formed gap (L) and integrating it with the semi-finished product member.

  According to this structure, since the semi-finished product in which the lower floor slab body and the upper floor slab body are integrated with the web is manufactured in advance, the formwork assembly work and the concrete placement of the lower floor slab and upper floor slab for match casting Work becomes easy. Moreover, when performing the match casting of the lower floor slab and the upper floor slab, the bulkhead is unnecessary, so the bulkhead frame is also unnecessary, and the cost of manufacturing equipment can be suppressed. Further, the joint surfaces between the upper floor slabs and the lower floor slabs adjacent to each other in the precast segments can be completely matched by match casting with concrete or mortar placed in the gap. Furthermore, the adjacent precast segment or the semi-finished product member thereof is brought into contact with at least three protrusions, so that the semi-finished product member and the adjacent precast segment or the semi-finished product member can be easily placed at a position where a predetermined plane alignment and longitudinal gradient are realized. Can be arranged.

  Further, according to the present invention, in the above configuration, the at least three protrusions (18) are different in a direction perpendicular to the bridge axis on the one end face (112a) of the upper floor slab body (112) of the semi-finished product member (101). A plurality of upper protrusions (18U) disposed at a position, and at least one lower protrusion (18L) disposed on the one end surface (113a) of the lower floor slab body (113) of the semi-finished product member. It can be configured.

  According to this configuration, the semi-finished product member and the adjacent pre-cast segment or the semi-finished product member can be easily placed at a predetermined position with high planar linear accuracy by bringing the adjacent pre-cast segment or the semi-finished product member into contact with the plurality of upper protrusions. Can be arranged.

  Further, according to the present invention, in the above configuration, the at least one lower protrusion is different in a direction perpendicular to the bridge axis on the one end surface (113a) of the lower floor slab body (113) of the semi-finished product member (101). It can be set as the structure containing the some lower side protrusion (18L) arrange | positioned in the position.

  According to this configuration, the semi-finished product member and the adjacent pre-cast segment or the semi-finished product member can be brought into high planar linear accuracy by bringing the adjacent pre-cast segment into contact with a plurality of lower projections provided on the lower floor slab body. It can be easily arranged at a predetermined position.

  Further, according to the present invention, in the above-described configuration, the step of providing the at least three protrusions (18) includes forming the semi-finished product member (101) of the precast segment (1) in the mold (21, 22). By placing concrete in a state where a concrete or mortar block (17) is inserted in the end portion of the floor, the block integrated with the upper floor slab body (112) and the lower floor slab body (113) is used. The at least three protrusions may be formed.

  According to this configuration, the protrusion can be easily formed.

  Further, according to the present invention, in the above-described configuration, in the step of manufacturing the semi-finished product member (101), the one end face (112a, 113a) of the upper floor slab body (112) and the lower floor slab body (113) is provided. A structure in which a plurality of locking members (16) are embedded so as to protrude from the one end surface, and the protruding dimension of each locking member from the one end surface is equal to or less than the width (W) of the gap (L) at that position. It can be.

  According to this configuration, the concrete or mortar placed in the gap is locked by the locking member, and is firmly integrated with the upper floor body and the lower floor body of the semi-finished product.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the precast segment of the match cast system which can suppress manufacturing cost can be provided.

Front view of precast segment manufactured by manufacturing method of precast segment of embodiment (A) Perspective view showing the web in the precast segment of FIG. 1, (B) Side view of the precast segment It is a schematic front view for demonstrating the manufacturing method of the precast segment of embodiment, and is a figure which shows the production method of a semi-finished product member Side view of semi-finished product The schematic side view which shows the manufacturing equipment used for the manufacturing method of the precast segment of embodiment The schematic side view for demonstrating the manufacturing method of the precast segment of embodiment Enlarged view of part VII in FIG. VIII arrow view in FIG. The schematic side view for demonstrating the manufacturing method of the precast segment of embodiment Sectional drawing of the principal part of the precast segment of embodiment The figure which shows the modification of the manufacturing method of a precast segment Side view of conventional bridge girder XIII-XIII sectional view in FIG. Enlarged view of the XIV part in Fig. 12 Schematic side view for explaining a conventional precast segment manufacturing method

  Hereinafter, an embodiment of a method for producing a precast segment 1 according to the present invention will be described with reference to the drawings.

  As shown in FIG. 12, the manufacturing method of the precast segment 1 according to the present embodiment is provided with an upper floor slab 53 and a lower floor slab 54 made of concrete and spaced apart from each other in the bridge axis direction. This is a manufacturing method for manufacturing a precast segment 1 that constitutes a part of the bridge girder of a bridge girder provided with a plurality of webs 55 that connect floor slabs 54 to each other. A box girder 51 as shown in FIG. 12 can be configured by connecting a plurality of the precast segments 1 in the bridge axis direction at the bridge point.

  As shown in FIG. 1, the precast segment 1 extends horizontally so as to connect a pair of vertically extending webs 11 and the upper ends of the pair of webs 11, and an upper floor slab 53 (FIG. 12). (See FIG. 12) and the upper floor slab 12 constituting a part of the bridge shaft direction and the lower floor slab 54 of the box girder 51 (see FIG. 12). It has the lower floor slab 13 constituting a part of the direction. The web 11, the upper floor slab 12, and the lower floor slab 13 are formed from high-strength concrete reinforced with, for example, steel fibers. The web 11, the upper floor slab 12, and the lower floor slab 13 may be made of reinforced concrete. Moreover, you may comprise the web 11 from a steel member.

  As shown in FIG. 2A, the web 11 has a butterfly (butterfly) shape whose length in the bridge axis direction gradually increases from the middle in the height direction to the upper side 11a and the lower side 11b in a side view. Yes. In the present embodiment, the web 11 has a butterfly shape in side view, but the shape of the web 11 is not limited to this, and the webs 11 of the precast segments 1 adjacent to each other are spaced apart from each other in the bridge axis direction. As long as they are spaced apart, the web 11 can have any of a variety of shapes.

  As shown in FIG. 1, the upper floor slab 12 and the lower floor slab 13 are formed in a substantially plate shape. The upper floor slab 12 is constructed so as to project laterally from each web 11. A thickened portion 12 a that protrudes downward is formed at a portion where the upper floor slab 12 is connected to the web 11. Similarly, a thickened portion 13 a that protrudes upward is formed at a portion where the lower floor slab 13 is connected to the web 11. Due to the thickened portion 12 a of the upper floor slab 12 and the thickened portion 13 a of the lower floor slab 13, the bonding strength between the upper floor slab 12 and the lower floor slab 13 and the web 11 is enhanced.

  On the lower surface of the upper slab 12, a cross beam 14 is formed at an appropriate position in the bridge axis direction (in the example of FIG. 2, at the center of each segment in the bridge axis direction). In addition, as shown in FIG. 2, the upper floor slab 12 has one end surface 12b in the bridge axis direction and the other end surface 12c on the other end surface 12c and a plurality of convex portions 15A constituting a shear key for increasing the shearing force resistance of the bridge girder. A plurality of recesses 15B are formed. The convex portion 15A and the concave portion 15B are formed in the thickened portion 12a and have complementary shapes. Similarly, a plurality of convex portions 15A and a plurality of concave portions 15B that are complementary to each other are formed on the thickened portion 13a of one end surface 13b and the other other end surface 13c of the lower floor slab 13 in the bridge axis direction. ing. Although not shown in the drawings, through holes for passing PC cables for installation are formed in appropriate positions on the upper floor slab 12 and the lower floor slab 13 so as to penetrate in the bridge axis direction.

  A plurality of locking members 16 and a block 17 described later are embedded in one end surface 12 b of the upper floor slab 12 and one end surface 13 b of the lower floor slab 13. The locking member 16 is entirely covered with a high-strength mortar M having a predetermined thickness formed on one end surfaces 12 b and 13 b of the upper floor slab 12 and the lower floor slab 13. In the present embodiment, 13 locking members 16 are embedded in the upper floor slab 12 in one row in the direction perpendicular to the bridge axis, and seven locking members 16 are embedded in the lower floor slab 13 in one row in the direction perpendicular to the bridge axis. ing. On the other hand, the block 17 is exposed on the surface of the high-strength mortar M. In the present embodiment, the two blocks 17 are embedded in the two convex portions 15A of the upper floor slab 12, that is, at different positions in the direction perpendicular to the bridge axis, and the two convex portions 15A of the lower floor slab 13 are in the direction perpendicular to the bridge axis. Two blocks 17 are embedded at different positions.

The manufacturing method of the precast segment 1 according to the present embodiment includes the following steps.
(A) A pair of an upper floor slab body 112 that is a major part of the upper floor slab 12 excluding a part made of high-strength mortar M and a lower floor slab body 113 that is a major part of the lower floor slab 13 excluding a part consisting of high-strength mortar M. Step (B) of manufacturing the semi-finished product member 101 of the precast segment 1 integrated with the web 11 of the plurality of protrusions 18 on one end face 112a, 113a in the bridge axis direction of the upper floor slab body 112 and the lower floor slab body 113. (C) a precast segment 1 (hereinafter referred to as “adjacent precast segment 2”) disposed adjacent to the precast segment 1 or a half thereof, so as to be used as a match cast wife formwork of the semi-finished product member 101 of the precast segment 1 Position where product member 101 (hereinafter referred to as “adjacent semi-finished product member 102”) contacts a plurality of protrusions 18 Step (D) Placement of concrete or mortar in the gap L formed between the semi-finished product member 101 of the precast segment 1 and the adjacent precast segment 2 or the adjacent semi-finished product member 102, and the semi-finished product member of the precast segment 1 Integrating with 101

  First, (A) the step of manufacturing the semi-finished product member 101 of the precast segment 1 and (B) the step of providing a plurality of protrusions 18 will be described with reference to FIGS.

  The web 11 uses a precast concrete member manufactured in advance. A pretension is introduced into the portion of the web 11 to which a tensile load is applied using a PC steel material. As described above, the web 11 may be made of a steel member.

  As shown in FIG. 3A, a lower floor slab form 21 for manufacturing the lower floor slab body 113 is assembled, and a pair of webs 11 are erected at predetermined positions on the lower floor slab form 21. . Then, concrete is placed in the lower floor slab form 21 so that the lower end portions 11c of the pair of webs 11 are buried, and the lower floor slab body 113 is manufactured. Also, the upper floor slab form 22 for manufacturing the upper floor slab body 112 is assembled at a predetermined position surrounding the upper end portions 11 d of the pair of webs 11. Then, the upper floor slab body 112 is manufactured by placing concrete in the upper floor slab body 112 so that the upper end portions 11d of the pair of webs 11 are buried. These operations may be performed sequentially or concurrently.

  Thereby, as shown in FIG. 3 (B), the semi-finished product member 101 of the precast segment 1 in which the upper floor slab body 112 and the lower floor slab body 113 are integrated with the pair of webs 11 can be manufactured. All the semi-finished products 101 are formed in the same size and the same shape. The upper floor slab body 112 and the lower floor slab body 113 of each semi-finished product member 101 have a rectangular shape in a plan view (that is, have a constant bridge axial dimension in the direction perpendicular to the major axis) and have the same axial dimension. have.

  As shown in FIG. 3A, the lower floor slab form 21 and the upper floor slab form 22 that form one end surfaces 112a and 113a of the lower floor slab body 113 of the upper floor slab body 112 are convex on the end portion. A through-hole for disposing the block 17 is formed in a portion forming the portion 15A. Prior to placing concrete, the four blocks 17 are inserted and fixed in the through holes. In this state, by placing concrete in the lower floor slab form 21 and the upper floor slab form 22, the block 17 is integrated with the lower floor slab body 113 or the upper floor slab body 112. The block 17 is used for alignment at the time of manufacture, and may be a concrete block, a mortar block, a steel block, or the like.

  When the lower floor slab form 21 and the upper floor slab form 22 are removed, as shown in FIG. 4, the upper floor slab body 112 and the block 17 projecting from the one end surfaces 112a and 113a of the lower floor slab body 113, The protrusion 18 (18U, 18L) is formed on the one end face 112a, 113a. Hereinafter, the one formed on the one end surface 112a of the upper floor slab body 112 is referred to as an upper protrusion 18U, and the one formed on the one end surface 113a of the lower floor slab body 113 is referred to as a lower protrusion 18L. The projecting dimension of each protrusion 18, that is, the projecting dimension of the block 17 from the inner surface of the mold frame, is between the one end surfaces 112 a and 113 a of the upper floor plate body 112 and the lower floor plate body 113 when the adjacent precast segment 2 is brought into contact therewith. Is set in advance to a value at which a gap L having a predetermined width W (see FIGS. 6 and 8) is formed.

  The width W of the gap L may be constant or may vary in the direction perpendicular to the bridge axis. When the box girder 51 has a curved shape in plan view, it is necessary to make the bridge axis direction length on the left side and the bridge axis direction length on the right side of the precast segment 1 arranged in the curved portion different from each other. In such a case, the upper floor slab body 112 and the lower floor slab body 113 of the semi-finished product member 101 are manufactured with a certain dimension in the bridge axis direction in the direction perpendicular to the bridge axis. Therefore, it is necessary to make the left and right lengths of the precast segment 1 different from each other. The width W of the gap L is a value that gives such a change in length in the direction perpendicular to the bridge axis to the upper floor slab 12 and the lower floor slab 13 to be manufactured.

  Further, the width W of the gap L may be the same or different between the upper floor slab body 112 and the lower floor slab body 113. When the box girder 51 has a gradient change in a side view or a longitudinal section, or when setting up over even if there is no gradient change, the bridge shaft of the upper deck 12 on the center line of the precast segment 1 to be manufactured It is necessary to make the direction length and the bridge axis direction length of the lower floor slab 13 different from each other. In such a case, since the upper floor slab body 112 and the lower floor slab body 113 of the semi-finished product member 101 are manufactured with the same length in the bridge axis direction, the width W of the gap L is varied differently, so that the precast segment It is necessary to make the upper and lower lengths of 1 different from each other. The width W of the gap L is a value that gives such a difference in length between the upper floor slab 12 and the lower floor slab 13 to be manufactured.

  Then, as shown in FIG. 4, a plurality of latches having latching protrusions at the tips on one end surfaces 112 a and 113 a of the upper floor plate body 112 and the lower floor plate body 113 of the semi-finished product member 101 of the manufactured precast segment 1. The member 16 is embedded so as to protrude from the one end surfaces 112a and 113a with a protruding dimension less than the width W of the gap L (see FIGS. 7 and 8). As the locking member 16, for example, a hexagonal bolt, an L-shaped bolt, a J-shaped bolt, or the like can be used. The number and the embedded position of the locking member 16 can be changed as appropriate. The locking member 16 may be assembled to the upper floor slab form 22 or the lower floor slab form 21 before placing concrete, and may be integrated with the upper floor slab 12 and the lower floor slab 13 by placing concrete. .

  Next, the manufacturing equipment 31 used in the process of manufacturing the precast segment 1 using the semi-finished product member 101 will be described with reference to FIG. As shown in FIG. 5, the manufacturing facility 31 includes a first carriage 35 and a second carriage 36 that are movable on the floor surface 32. On the first carriage 35 and the second carriage 36, a plurality of hydraulic jacks 38, and a placing table 39 for placing the adjacent precast segment 2 or the semi-finished product member 101 supported by the plurality of hydraulic jacks 38, Are arranged respectively. The mounting table 39 can adjust the plane position by the movement of the first carriage 35 and the second carriage 36, and the height and inclination angle (longitudinal direction and transverse direction) can be adjusted by adjusting the strokes of the plurality of hydraulic jacks 38. It is adjustable.

  Next, steps (C) to (D) for manufacturing the precast segment 1 using the manufacturing facility 31 shown in FIG. 5 will be described with reference to FIGS.

  First, as shown in FIG. 6, the adjacent precast segment 2 previously manufactured on the first carriage 35 is arranged in the vicinity of the semi-finished product member 101 manufactured on the second carriage 36. As shown in FIG. 7, the semi-finished product member 101 is arranged so that the plurality of protrusions 18 are located on the adjacent precast segment 2 side, and the adjacent precast segment 2 is a portion made of high-strength mortar M (match The cast part) is disposed on the opposite side of the semi-finished product member 101. Thereby, the other end surfaces 12c and 13c on the semi-finished product member 101 side of the upper floor slab 12 and the lower floor slab 13 of the adjacent precast segment 2 are matched to form the one end surfaces 12b and 13b of the upper floor slab 12 and the lower floor slab 13 Can be used as cast wife formwork.

  Subsequently, the adjacent precast segment 2 is moved to a position where it abuts on the plurality of protrusions 18 of the semi-finished product member 101. Specifically, the planar position of the adjacent precast segment 2 is adjusted by the first carriage 35, and the height and the inclination angle (vertical direction and transverse direction) of the adjacent precast segment 2 are adjusted by the plurality of hydraulic jacks 38. The upper floor slab 12 of the adjacent precast segment 2 is brought into contact with the two upper protrusions 18U, and the lower floor slab 13 of the adjacent precast segment 2 is brought into contact with the two lower protrusions 18L.

  Accordingly, as shown in FIGS. 6 and 8, between the semi-finished product member 101 and the adjacent precast segment 2 (between the upper floor slab body 112 and the upper floor slab 12 and between the lower floor slab body 113 and the lower floor slab 13 A gap L having a predetermined width W is formed between the two. The width W of the gap L is preferably about 10 mm to 20 mm in a narrow place. In the gap L, the upper projection 18U and the lower projection 18L projecting from the one end surfaces 112a, 113a of the upper floor slab body 112 and the lower floor slab body 113 of the semi-finished product 101 are the same as the width W of the gap L at that position. It protrudes with a protruding dimension and is in contact with the other end faces 12c and 13c of the upper floor slab 12 and the lower floor slab 13 of the adjacent precast segment 2. Further, in the gap L, the locking member 16 protrudes from the one end face 112a, 113a of the upper floor slab body 112 and the lower floor slab body 113 of the semi-finished product 101 with a projecting dimension equal to or smaller than the width W of the gap L at that position. ing. Thus, since the some protrusion 18 is previously provided in the semi-finished product member 101, the adjacent precast segment 2 can be easily arrange | positioned in a predetermined position.

  Then, as shown in FIG. 9, the gap mold 40 is assembled so as to cover the lower part and the left and right sides of the gap L, and the high-strength mortar M is placed inside the gap L. Thereby, the upper floor slab 12 and the lower floor slab 13 are manufactured using the upper floor slab body 112 and the lower floor slab body 113, and the semi-finished product member 101 becomes the completed precast segment 1. In place of the high-strength mortar M, concrete may be cast.

  As shown in FIG. 10, the high-strength mortar M placed in the gap L is locked by a locking member 16 embedded in one end surface 113a of the lower floor plate body 113 of the semi-finished product 101, and the semi-finished product member 101 is firmly integrated. Similarly, the high-strength mortar M is locked by the locking member 16 embedded in the one end surface 112a of the upper floor slab body 112 of the semi-finished product member 101, and is firmly integrated with the semi-finished product member 101. The end surfaces 12b and 13b on the adjacent precast segment 2 side formed by the high-strength mortar M integrated with the upper floor main body 112 and the lower floor main body 113 of the semi-finished product member 101 are the upper floor slab 12 and the lower Since the other end surfaces 12c and 13c of the floor slab 13 are formed as match cast wife molds, they completely coincide with these other end surfaces 12c and 13c.

  After the high-strength mortar M placed in the gap L is cured, the adjacent precast segment 2 is separated from the newly produced precast segment 1 and transported to a temporary storage site. Then, the newly produced precast segment 1 is used as the adjacent precast segment 2 to manufacture the next precast segment 1. By repeating the above steps, the precast segments 1 are sequentially manufactured.

  In addition, as shown in FIG. 11, as the match cast wife formwork for forming the end faces 12b and 13b on the adjacent precast segment 2 side of the upper floor slab 12 and the lower floor slab 13, The product member 102 may be used.

  As described above, in the method for manufacturing the precast segment 1 according to the present embodiment, the following operational effects are exhibited.

  That is, as shown in FIGS. 6 and 7, since the semi-finished product member 101 in which the upper floor slab body 112 and the lower floor slab body 113 are integrated with the web 11 is manufactured in advance, the upper floor slab 12 and lower Assembling work of the floor slab 13 and concrete placing work are facilitated. Further, when performing the match casting of the upper floor slab 12 and the lower floor slab 13, the bulkhead frames 61 and 62 (FIG. 15) for the upper floor slab and the lower floor slab are unnecessary, and therefore the bulkhead frame 64 is also unnecessary. The cost of the manufacturing equipment 31 can be suppressed. Moreover, the joint surface between the upper floor slabs 12 adjacent to each other and the joint surface between the lower floor slabs 13 can be completely matched by match casting with high-strength mortar M or concrete placed in the gap L. .

  Further, by bringing the adjacent precast segment 2 or the adjacent semi-finished product member 102 into contact with the at least three protrusions 18, the semi-finished product member 101 and the adjacent precast segment 2 or the adjacent semi-finished product member 102 have a predetermined plane alignment and longitudinal gradient. It can be easily arranged at the position where it is realized.

  As shown in FIG. 1, a plurality of upper projections 18U are provided on one end surface 112a of the upper floor main body 112 of the semi-finished product member 101 at different positions in the direction perpendicular to the bridge axis. For this reason, the adjacent precast segment 2 or the adjacent semi-finished product member 102 is brought into contact with the plurality of upper protrusions 18U, whereby the semi-finished product member 101 and the adjacent precast segment 2 or the adjacent semi-finished product member 102 are predetermined with a high plane alignment and longitudinal gradient. It can be easily arranged at the position.

  A plurality of lower protrusions 18L are provided on one end surface 113a of the lower floor slab body 113 of the semi-finished product member 101 at different positions in the direction perpendicular to the bridge axis. Therefore, the semi-finished product member 101 and the adjacent pre-cast segment 2 or the adjacent semi-finished product member 102 can be made to have a high planar alignment by bringing the adjacent precast segment 2 into contact with the plurality of lower projections 18L provided on the lower floor slab body 113. And it can arrange | position to a predetermined position easily with a longitudinal gradient.

  As shown in FIG. 3, the plurality of protrusions 18 are blocks made of concrete or mortar on the end portions of the lower floor mold 21 and the upper floor mold 22 in the step of manufacturing the semi-finished member 101 of the precast segment 1. By placing concrete with the 17 inserted, the block 17 integrated with the upper floor slab body 112 and the lower floor slab body 113 is formed. Therefore, formation of the protrusion 18 is easy.

  As shown in FIGS. 7 and 8, in the step of manufacturing the semi-finished product member 101, the projecting dimension is equal to or less than the width W of the gap L at that position on the one end surfaces 112 a and 113 a of the upper floor slab body 112 and the lower floor slab body 113. Are embedded so as to protrude from the one end surfaces 112a and 113a. Therefore, the high-strength mortar M or concrete placed in the gap L is locked by the locking member 16 and is firmly integrated with the upper floor body 112 and the lower floor body 113 of the semi-finished product 101.

  The description of the specific embodiments is finished as described above, but the present invention is not limited to these embodiments, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the bridge girder is configured as a single box girder bridge, but it is configured as a multi-main girder box girder bridge having two or more box-shaped cross sections, a multi-box girder bridge having continuous box-shaped cross sections, or the like. May be.

  Moreover, in the said embodiment, the cross-sectional shape of a bridge girder is set so that a pair of web 11 may extend substantially perpendicularly from the upper surface of the lower floor slab 13, and the upper floor slab 12 may protrude sideways from a pair of web 11. FIG. However, the pair of webs 11 have a cross-sectional shape reaching the upper floor slab 12 with a slight inclination angle so that the upper floor slab 12 extends upward from the upper surface or side edge of the lower floor slab 13. It is also possible to have a cross-sectional shape that does not protrude sideways. Further, the upper floor slab 12 may be positioned only above the pair of webs 11.

  In the above embodiment, by inserting the block 17 and placing concrete, the protrusions 18 are formed on the one end surfaces 112a and 113a of the upper floor slab body 112 and the lower floor slab body 113. Similarly, the protrusion 18 may be embedded or attached so as to protrude from the one end surfaces 112a and 113a of the upper floor slab body 112 and the lower floor slab body 113 after the concrete is placed. Further, the upper protrusion 18U may be provided at the left and right ends of the upper floor slab body 112. By doing in this way, planar alignment and a longitudinal gradient can be raised further.

  In addition, the specific configuration, arrangement, quantity, shape, material, procedure, and the like of each member and part can be changed as appropriate without departing from the spirit of the present invention. On the other hand, all the components of the structure and procedure shown in the above embodiment are not necessarily essential, and may be appropriately selected.

DESCRIPTION OF SYMBOLS 1 Precast segment 2 Adjacent precast segment 11 Web 12 Upper floor slab 12b One end surface 13 Lower floor slab 13b One end surface 16 Locking member 17 Block 18 Protrusion 18L Lower protrusion 18U Upper protrusion 21 Form for lower floor slab 22 Form for upper floor slab 101 Semi-finished product member 102 Adjacent semi-finished product member 112 Upper floor slab body 112a One end surface 113 Lower floor slab body 113a One end surface L Crevice M High strength mortar W Width

Claims (5)

A part of the bridge girder of a bridge girder comprising a concrete upper floor slab and a lower floor slab, and a plurality of webs that are spaced apart from each other in the bridge axis direction and connect the upper floor slab and the lower floor slab to each other A precast segment manufacturing method comprising:
Producing a semi-finished product member of the precast segment in which the upper floor slab body constituting the majority of the upper floor slab and the lower floor slab body comprising the majority of the lower floor slab are integrated with the web;
Providing at least three protrusions on one end surface in the bridge axis direction of the upper floor slab body and the lower floor slab body;
Arranging the adjacent precast segment adjacent to the semi-finished product member or the semi-finished product member to be used as a match cast wife formwork of the semi-finished product member at a position in contact with the at least three protrusions;
A step of placing concrete or mortar in a gap formed between the semi-finished product member and the adjacent pre-cast segment or the semi-finished product member to integrate the semi-finished product with the semi-finished product member. Manufacturing method.   The at least three protrusions are a plurality of upper protrusions arranged at different positions in the direction perpendicular to the bridge axis on the one end face of the upper floor slab body of the semi-finished product member, and the lower floor slab body of the semi-finished product member The method for producing a precast segment according to claim 1, further comprising at least one lower protrusion disposed on one end surface.   The at least one lower protrusion includes a plurality of lower protrusions arranged at different positions in a direction perpendicular to the bridge axis on the one end face of the lower floor slab body of the semi-finished product member. The manufacturing method of the precast segment as described in 2.   In the step of providing the at least three protrusions, in the step of manufacturing the semi-finished product member of the precast segment, the concrete is cast in a state where a concrete or mortar block is inserted in the end portion of the mold, and the upper floor The method for producing a precast segment according to any one of claims 1 to 3, wherein the at least three protrusions are formed by the block integrated with the plate main body and the lower floor plate main body.   In the step of producing the semi-finished product member of the precast segment, a plurality of locking members are embedded in the one end surface of the upper floor slab body and the lower floor plate body so as to protrude from the one end surface, and each locking member The protrusion dimension from the said one end surface is below the width | variety of the said gap in the position, The manufacturing method of the precast segment in any one of Claims 1-4 characterized by the above-mentioned.

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