JP7096734B2 - Joint structure of concrete precast deck - Google Patents

Description

The present invention eliminates the installation of reinforcing bars in the filling portion to save labor, has the effect of reducing the filling material, stabilizes the construction efficiency by facilitating the alignment, etc., and can significantly shorten the construction period. Concerning the joint structure of concrete precast decks.

Conventionally, concrete precast floor slabs manufactured in factories, site yards, etc. have been used for floor slab replacement work for bridges and the like in order to shorten the construction period. As a joint structure for connecting the concrete precast decks to each other, various structures have been proposed and put into practical use.

The most commonly used joint structure is the so-called loop joint. In this loop joint, as shown in FIG. 26, the loop-shaped joint reinforcing bars 51 and 52 protruding in the bridge axis direction are arranged at appropriate intervals, and the loop-shaped joints 51 and 52 are arranged in the direction perpendicular to each other. It is a joint structure 50 in which a reinforcing bar 53 is inserted from the above, and cast-in-place concrete 54 is placed in a padding portion between the precast floor slabs to connect adjacent precast floor slabs to each other.

Further, the application of the loop joint structure is conditional on the floor slab thickness being 240 mm or more. Therefore, when the floor slab thickness is thinner than that, for example, the "rationalized joint" shown in Patent Document 1 below. A joint structure called is used. In the "rationalized joint", as shown in FIG. 27, a fixing head 62 having a diameter larger than the diameter of the connecting reinforcing bar is formed at the tip of the linear connecting reinforcing bar 61 without using the loop reinforcing bar. On each joint side surface of the precast floor slab body, a large number of these are projected horizontally at predetermined intervals on the upper edge side and the lower edge side, respectively, and the two precast floor slab bodies are connected within the joint interval. This is a joint structure 60 in which the reinforcing bars 61, 61 ... Are alternately arranged and overlapped in the horizontal direction, the reinforcing bars 63 are arranged at predetermined positions, and then cast-in-place concrete 64 is placed within the joint interval.

Further, various mechanical joints have been conventionally proposed in which labor saving is achieved by eliminating the installation of reinforcing bars in the filling portion and the construction period is shortened by reducing the filling material. For example, in addition to the simplest mechanical joint that fits a male joint to a female joint fitting with a groove-shaped cross section, Patent Document 2 below describes a plate-shaped concrete structure such as a concrete precast floor slab. It is a joint structure for joining to each other in a state of being arranged in a direction, and at least an upper opening upward and a peripheral opening communicating with the upper opening are formed in a part of the peripheral portion thereof, and the inside thereof is fitted. A tubular first joint fitting having a substantially U-shaped cross section, which is a hole, is joined to each other at the joint ends of both of the concrete structures, and the axis thereof is along the thickness direction of the concrete structure. The upper opening is placed on the upper surface and the peripheral opening faces the joint end face, and the fitting hole is embedded from each opening so as to communicate with the outside. The peripheral openings of these first joint fittings are opposed to each other, and in the facing state, the connecting portion extending over the peripheral opening of these first joint fittings and the connecting portion are integrally formed at both ends of the connecting portion. A second joint fitting having a fitting portion that is housed inside the joint fitting and cannot be detached from the peripheral opening, and each fitting portion is inserted into the fitting hole of both first joint fittings from the upper opening. It is characterized by connecting each concrete structure to be inserted and joined, filling the inside of the fitting hole with a solidifying material, and fixing the fitting portion of the first joint fitting and the second fitting. The joint structure of the concrete structure to be used is disclosed.

In Patent Document 3 below, a cotter type joint device in which C-shaped joint fittings having a groove hole having a cross-section lip groove type are opposed to each other, and a cotter having an H-shaped cross section is inserted into the groove holes united in an H-shape and fastened. In the above, bolt holes are drilled in the vicinity of the central portion of the left and right flange portions of the cotter having an H-shaped cross section, and further, a bottom surface portion having a predetermined thickness is formed in the C-type joint fitting, and the bottom surface thereof is formed. A cotter type joint device is disclosed in which a locking portion for a bolt to be inserted into the bolt hole is provided in the portion.

Japanese Unexamined Patent Publication No. 2015-1045 Japanese Unexamined Patent Publication No. 7-71195 Japanese Unexamined Patent Publication No. 2001-214694

The above-mentioned mechanical joint structure is superior to others in that it can minimize the restrictions due to lane restrictions and traffic restrictions by shortening the construction period and minimize the influence on surrounding traffic. However, in the case of the so-called "cotter type joint" as in Patent Documents 2 and 3, excessive accuracy is required for the floor slab erection in order to insert the H-shaped cotter, which makes it difficult to insert the cotter. In the unlikely event that such a situation occurs, there is a problem that the process may be significantly delayed.

Further, in the case of a mechanical joint in which a male joint is fitted to a female joint fitting having a groove-shaped cross section, the opening side of the vertical groove of the female joint is supported when an excessive tensile force is applied to the male joint. There was a problem that it was easily deformed in the opening direction because it was not used. Further, the so-called "cotter type joint" as in Patent Documents 2 and 3 has a problem that the manufacturing cost is high and the construction cost is greatly affected.

Therefore, the main problem of the present invention is to eliminate the installation of reinforcing bars in the filling portion to save labor, reduce the filling material, and stabilize the construction efficiency by facilitating the alignment. It is an object of the present invention to provide a mechanical joint structure of a concrete precast floor slab in which the construction period can be shortened and the vertical groove is prevented from being deformed in a female joint having a grooved cross section.

In order to solve the above problems, the present invention according to claim 1 is a joint structure for joining concrete precast decks to each other.
A female joint with a groove-shaped cross section in a plan view is buried in the joint end face of a concrete precast deck on one side of the joint at a predetermined interval in the horizontal direction, with the vertical groove facing the outside.
The tips of the bridge axial reinforcing bars are formed so as to protrude outward at predetermined intervals in the horizontal direction on the joint end face of the concrete precast floor slab on the other side of the joint, and are relative to the tips of these bridge axial reinforcing bars. A male joint with a large-diameter fixing member installed is buried.
The female joint of the concrete precast floor slab on one side is engaged with the male joint of the concrete precast floor slab on the other side, so that the concrete precast floor slabs are joined to each other and vertically to the female joint. With the deformation restraining material of the groove installed, the internal space of the female joint, the upper space and / or the lower space of the female joint, and the concrete precast floor slab on one side and the concrete precast floor slab on the other side. Provided is a joint structure of a concrete precast floor slab, characterized in that the gap portion of the concrete is filled with a grout material.

In the invention according to claim 1, a female joint having a groove-shaped cross section is embedded in a concrete precast slab on one side of the joint portion with a vertical groove facing the outside in a plan view, and the joint portion is defined as a boundary. A male joint is embedded in the concrete precast slab on the other side, and these female joints and the male joint are engaged with each other to bring the concrete precast slabs together, and the female joint is vertically connected to the female joint. With the deformation restraining material of the groove installed, the internal space of the female joint, the upper space and / or the lower space of the female joint, and the concrete precast slab on one side and the concrete precast slab on the other side. The gap portion of the concrete is filled with the grout material.

Since it has a simple engagement structure with the female joint having a groove-shaped cross section and the male joint having a rod shape, the allowable range of error is large, and it becomes possible to easily perform alignment by absorbing manufacturing errors and construction errors. The construction period can be significantly shortened. Further, since the deformation restraining material of the vertical groove portion is installed on the female joint, it is possible to surely prevent the deformation of the vertical groove portion of the female joint when an excessive tensile force is applied. The filling of the grout material is a gap between the internal space of the female joint, the upper space and / or the lower space of the female joint, and the concrete precast floor slab on one side and the concrete precast floor slab on the other side. The filling amount of grout material can also be reduced, and the working time can be shortened and the construction cost can be reduced.

The concrete according to claim 1, wherein the deformation restraining material of the vertical groove portion is an upper lid provided in the upper surface opening of the female joint and / or a lower lid provided in the lower surface opening of the female joint. A precast floor slab joint structure is provided.

The invention according to claim 2 defines a specific example of the vertical groove portion as a deformation restraining material. Specifically, the deformation restraining material of the vertical groove portion may be an upper lid provided in the upper surface opening of the female joint and / or a lower lid provided in the lower surface opening of the female joint.

According to the third aspect of the present invention, the deformation restraining material of the vertical groove portion is a width retaining material provided so as to connect both side walls of the female joint, and the joint structure of the concrete precast deck according to claim 1. Is provided.

The invention according to claim 3 defines another specific example as a deformation restraining material for the vertical groove portion. Specifically, as the deformation restraining material of the vertical groove portion, a width fixing material provided so as to connect the wall surfaces on both sides of the female joint may be used.

The concrete precast according to claim 1, wherein the deformation restraining material of the vertical groove portion is a width retaining material provided so as to connect both side portions straddling the vertical groove of the female joint. A floor slab joint structure is provided.

The invention according to claim 4 defines another specific example as a deformation restraining material for the vertical groove portion. Specifically, as the deformation restraining material of the vertical groove portion, a width stopper material provided so as to connect both side portions straddling the vertical groove of the female joint may be used.

According to the fifth aspect of the present invention, the deformation restraining material of the vertical groove portion is a width stopper provided with a side holding portion for sandwiching both side portions of the female joint across the vertical groove on the front surface side and the back surface side, respectively. The joint structure of the concrete precast deck according to claim 1 as a material is provided.

The invention according to claim 5 defines another specific example as a deformation restraining material for the vertical groove portion. Specifically, as the deformation restraining material for the vertical groove portion, a width stopper material having side holding portions for sandwiching the vertical groove portions of the female joint between the front surface side and the back surface side, respectively, may be used. can.

As the present invention according to claim 6, the joint structure of the concrete precast deck according to any one of claims 1 to 5, wherein the female joint is manufactured by a steel profile or die casting is provided.

The invention according to claim 6 defines the material of the female member. As the female member, it is desirable to manufacture it by using a steel profile or die casting.

As the present invention according to claim 7, the male joint is provided with the joint structure of the concrete precast deck according to any one of claims 1 to 6, which is provided in two stages in the vertical direction.

In the invention according to claim 7, the male joints are arranged at predetermined intervals in the horizontal direction, but it is desirable to provide the male joints in two stages in the vertical direction at each position. This is to deal with the compressive force and tensile force due to bending.

The concrete product according to claim 8, wherein a spacer is disposed between the vertical groove of the female joint and the fixing member of the male joint inside the female joint. A precast floor slab joint structure is provided.

In the invention according to claim 8, a spacer is arranged inside the female joint between the vertical groove of the female joint and the fixing member of the male joint. This makes it possible to reliably transmit the force between the female joint and the male joint.

As the present invention according to claim 9, the joint structure of the concrete precast deck according to any one of claims 1 to 8 is provided, in which concrete is filled in place of the grout material.

The invention according to claim 9 is to fill concrete instead of the grout material in order to reduce the construction cost.

As described in detail above, according to the present invention, labor saving is achieved by eliminating the installation of reinforcing bars in the filling portion, and in addition to the effects of reducing the filling material, the construction efficiency is stabilized by facilitating the alignment and the like. It is possible to significantly shorten the construction period and to provide a mechanical joint structure of a concrete precast floor slab that prevents deformation of vertical grooves in a female joint having a grooved cross section.

It is a top view which shows the joint part 2 of the concrete precast floor slab 1A, 1B. It is an enlarged view of the main part (part A of FIG. 1). It is a vertical sectional view (III-III sectional view of FIG. 1) of the joint part 2. FIG. It is a floor slab perspective view which shows the female joint 3. It is an enlarged plan view of the main part which shows the female joint 3. It is an enlarged vertical sectional view of a main part which shows the female joint 3. A groove-shaped cross-sectional member 3 is shown, (A) is a front view, (B) is a plan view, and (C) is a right side view. It is a floor slab perspective view which shows the male joint 4. It is an enlarged plan view of the main part which shows the male joint 4. It is connection procedure diagram (A) (B) of the concrete precast deck. It is (A)-(C) of the procedure diagram of the joining procedure of the precast floor slab. It is a vertical sectional view which shows the modification (the 1) of the female joint 3. It is a vertical sectional view which shows the modification (the 2) of the female joint 3. It is a perspective view which shows the groove type cross-sectional member 3 for applying the 1st example (width stopper 18) of the deformation restraint material 12. It is a perspective view which shows the width stopper 18. (A) is a plan view and (B) is a vertical sectional view showing a mounting state of the width stopper 18. It is a perspective view which shows the groove type cross-sectional member 3 for applying the 2nd example (width stopper 19) of the deformation restraint material 12. It is a perspective view which shows the width stopper material 19. (A) is a plan view and (B) is a vertical sectional view showing a mounting state of the width stopper 19. It is a perspective view which shows the groove type cross-sectional member 3 for applying the 3rd example (width stopper 20) of the deformation restraint material 12. It is a perspective view which shows the 3rd example (width stopper 20) of the deformation restraint material 12. (A) is a plan view and (B) is a vertical sectional view showing a mounting state of the width stopper 20. It is a perspective view which shows the groove type cross-sectional member for applying the 4th example (width stopper material 22) of the deformation restraint material 12. It is a perspective view which shows the 4th example (width stopper material 22) of the deformation restraint material 12. (A) is a plan view and (B) is a vertical sectional view showing a mounting state of the width stopper 22. It is a vertical sectional view which shows the conventional loop joint. It is a vertical sectional view which shows the conventional rationalized joint.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention is a mechanical joint structure for joining concrete precast decks (hereinafter, simply referred to as precast decks). In general, in the case of mechanical joints, compared to conventional loop joints and rationalized joints, labor can be saved by eliminating the installation of reinforcing bars in the filling part, and the construction period can be significantly shortened by reducing the number of filling materials. However, the joint itself is expensive, the construction cost is high, and high accuracy is required for alignment. Therefore, the present invention proposes a mechanical joint structure having a simple structure, capable of absorbing a predetermined amount of error, and excellent in alignment workability.

Specifically, as shown in FIG. 1, the joint structure has a groove-shaped cross section in a plan view at a predetermined interval in the horizontal direction on the joint end surface of the precast floor slab 1A on one side of the joint portion 2. The female joint 3 is embedded with the vertical groove 3a facing the outside, and at least two steps in the vertical direction at predetermined intervals in the horizontal direction on the joint end surface of the precast floor slab 1B on the other side of the joint portion 2. In the arrangement, the tip of the bridge axial reinforcing bar 8 is formed so as to protrude to the outside, and the male joint 4 in which the nut fixing member 9 is installed is embedded in the tip of the bridge axial reinforcing bar 8.
As shown in FIGS. 2 and 3, a male joint 4 of the precast deck 1B on the other side is inserted into the female joint 3 of the precast deck 1A on one side to bring the two decks together. A state in which the deformation restraining material 12 of the vertical groove portion 3a is installed in the female joint 3, the internal space IS of the female joint 3 and the upper space US and / or the lower space LS of the female joint 3 on one side. It is a joint structure in which the grout material 17 is filled in the gap portion M between the precast deck 1A and the precast deck 1B on the other side.

Hereinafter, the details will be described in more detail.

First, the female joint 3 provided on the precast deck 1A on one side will be described in detail with reference to FIGS. 4 to 7.

As shown in FIG. 7 in detail, the female joint 3 is a member made of a steel profile or die-cast having a groove-shaped cross section in a plan view (hereinafter, also referred to as a groove-shaped cross-section member). Is. The width dimension B and the depth dimension C of the groove-shaped cross-sectional member 3 are approximately 80 to 150 mm, preferably 100 to 130 mm. The length dimension H of the groove-shaped cross-sectional member 3 is 60 to 90%, preferably 70 to 85% of the thickness of the floor slab, and the width of the vertical groove 3a formed in the center. S is 15 to 30 mm, preferably 18 to 25 mm, and is 110 to 150%, preferably 120 to 140% of the diameter of the bridge axial reinforcing bar 8 constituting the male joint 4 described later. It is desirable that the ratio of the male joint 4 to the diameter be within an appropriate dimensional value range because the allowable range of manufacturing error or construction error is closely related. Further, if this ratio is made too large, the engagement of the male joint 4 with the fixing member 9 becomes small, and the force transmission efficiency deteriorates. Therefore, it is desirable to form the male joint 4 at a predetermined ratio.

As shown in FIG. 7, on the back side wall surface 3C of the groove-shaped cross-sectional member 3, in the illustrated example, through holes 3b and 3b for inserting the reinforcing bars are formed in an upper and lower two-stage arrangement. Further, on the upper surface and the lower surface, an appropriate number of screw screwing holes 3c ... 3d ... for fixing the upper lid 13 and the lower lid 14 described later with screws are formed, respectively. In order to prevent the opening deformation of the vertical groove 3a, two places are provided on both side portions 3A and 3A of the vertical groove 3a, two places are provided on both side wall surfaces 3B and 3B, and two places are provided on the back side wall surface 3C, for a total of about six places. It is desirable to do.

As shown in FIG. 4, the groove-shaped cross-sectional member 3 is installed at a predetermined interval in the horizontal direction, specifically, at an interval of about 100 to 300 mm at the time of manufacturing the precast deck 1A, and the vertical groove 3a is installed. The upper part and the lower part are buried open to the outside while facing the outside. Preferably, as shown in FIG. 6, it is installed at the center position with respect to the height direction of the deck, and as shown in FIG. 3, the internal space IS of the female joint 3 and the upper side of the female joint 3 The space US and the lower space LS are spaces filled with the grout material 17, respectively.

As shown in FIG. 1, the groove-shaped cross-sectional member 3 is firmly fixed by a reinforcing bar 5 embedded in a deck slab. As shown in FIGS. 5 and 6, the end portion of the bridge axial reinforcing bar 5 embedded in the frame of the deck is inserted into the through holes 3b and 3b of the groove-shaped cross-section member 3, and the groove-shaped cross-section member 3 is inserted. It is fixed by fasteners 6 made of washers and nut members, which are arranged on both sides of the back side wall surface 3C. The bridge axial reinforcing bar 5 may be connected to the groove-shaped cross-sectional member 3 by welding.

As shown in FIG. 1, in the deck skeleton near the buried portion of the groove-shaped cross-section member 3, in addition to the bridge axial reinforcing bar 5 for fixing the groove-shaped cross-sectional member 3, the bridge axial reinforcing bar , Reinforcing bars in the direction perpendicular to the bridge axis, PC steel wires in the direction perpendicular to the bridge axis, etc. may be arranged in the cross section to firmly reinforce the bridge.

In order to bury the groove-shaped cross-section member 3 accurately and efficiently by a predetermined number of locations, an angle 7 is provided on the back surface side of the plurality of groove-shaped cross-section members 3, 3 ... In the illustrated example. 3 ... Is provided so as to connect them. The angle 7 serves as a ruler, and concrete is cast in a state where a plurality of groove-shaped cross-sectional members 3, 3 ... Are fixed at accurate positions. The angle 7 can be omitted.

Next, the male joint 4 provided on the precast deck 1B on the other side will be described in detail with reference to FIGS. 8 and 9.

In the male joint 4, the tip of the bridge axial reinforcing bar 8 is formed so as to project outward from the joint surface, and the fixing member 9 is installed at the tip of the bridge axial reinforcing bar 8. In the illustrated example, the fixing member 9 is composed of a nut 10 and a washer 11 provided at a position adjacent to the nut 10. The washer 11 can be omitted.

As shown in FIG. 8, the male joints 4 are provided at a predetermined interval in the horizontal direction and at least in two stages in the vertical direction. The diameter of the bridge axial reinforcing bar 8 is approximately D16 to D22, and is smaller than the width of the vertical groove 3a of the groove-shaped cross-sectional member 3. As shown in FIG. 10, the precast decks are connected to each other by inserting the male joint 4 into the vertical groove 3a of the female joint 3 from above and below.

As shown in FIG. 1, in the deck skeleton near the buried portion of the bridge axial reinforcing bar 8, in addition to the bridge axial reinforcing bar 8, the bridge axial reinforcing bar, the bridge axial perpendicular reinforcing bar, and the bridge shaft A PC steel wire in a perpendicular direction may be arranged in a cross direction to firmly reinforce the wire.

As shown in FIGS. 2 and 3, the connection between the female joint 3 and the male joint 4 described above is a state in which the fixing member 9 of the male joint 4 is engaged with the vertical groove 3a of the female joint 3, that is, the fixing member. 9 is positioned inside the female joint 3, and both precast floor slabs 1A and 1B are connected to each other with the bridge axial reinforcing bar 8 inserted through the vertical groove 3a. Further, the deformation restraining material 12 of the vertical groove portion 3a is installed in the female joint 3 so that the vertical groove 3a of the female joint 3 does not open when a tensile force acts on the joint portion 2.

The deformation restraining material 12 includes an upper lid 13 provided so as to close the upper surface opening of the groove-shaped cross-sectional member 3 and a lower lid 14 provided so as to close the lower surface opening of the groove-shaped cross-sectional member 3. The upper lid 13 and the lower lid 14 are fixed by screws 15, respectively. The upper lid 13 and the lower lid 14 are made of steel plate or die-cast.

Further, in this embodiment, as shown in FIGS. 2 and 3, a spacer 16 is provided between the vertical groove 3a of the female joint 3 and the fixing member 9. If the overlap margin between the fixing member 9 and the side portions forming the vertical groove 3a is not sufficiently secured, it is assumed that the force cannot be transmitted smoothly. Therefore, the spacer 16 is installed and the vertical groove is provided. It is desirable to secure a sufficient overlap margin with both side portions forming 3a. The spacer 16 does not necessarily have to be in contact with both side portions forming the vertical groove 3a, and the deformation restraining material 12 is provided so that the grout material 17 is interposed between the spacer 16 and the vertical groove 3a is not deformed. It is thought that the tensile force will be sufficiently transmitted through the grout material 17 if it is restrained by the grout material 17, but since the grout material 17 may be subjected to repeated shearing forces and crushed, the spacer 16 is used. It is desirable to keep them in contact with both side portions forming the vertical groove 3a.

After installing the upper lid 13 and the lower lid 14, the internal space IS of the female joint 3, the upper space US and the lower space LS of the female joint 3, and the precast deck on one side and the precast deck on the other side. The grout material 17 is filled in the gap portion M of the above.
[How to combine floor slab 1]
In the above embodiment, it has been described that the female joint 3 is provided on the joint end surface of the precast deck on one side and the male joint 4 is provided on the joint end surface of the precast deck on the other side. In the case of joining three or more stations, as shown in FIG. 10, a female joint 3 is provided on one opposite side surface of one rectangular precast deck 1, and a male joint 3 is provided on the opposite side surface. The joint 4 is provided, and the precast decks 1, 1 ... Are installed in the procedure of joining the precast decks in order.

Specifically, as shown in FIGS. 10 and 11 (A), the male joint 4 of the precast deck 1 in the following order is vertically oriented from the upper side with respect to the female joint 3 of the installed precast deck 1. Install the precast floor slab 1 while dropping it into the floor, and align the two. Since the present invention has a simple fitting structure consisting of a female joint 3 using a groove-shaped cross-sectional member and a bridge axial reinforcing bar 8 provided with a fixing member 9, the permissible value of error is large, and manufacturing error and construction error are caused. It can be absorbed and aligned easily.

Next, as shown in FIG. 11B, sufficient for both side portions forming the vertical groove 3a by installing the spacer 16 between the vertical groove 3a of the female joint 3 and the fixing member 9. After securing the overlapping allowance, the upper lid 13 and the lower lid 14 are installed on the lower surface and the upper surface of the female joint 3, and are firmly fixed by the screws 15. It is desirable that the upper lid 13 is provided with an air hole for filling the grout material 17.

When the work up to the above procedure is completed, as shown in FIG. 11C, the internal space IS of the female joint 3, the upper space US and the lower space LS of the female joint 3, and one side thereof. The grout material 17 is filled in the gap portion M between the precast deck and the precast deck on the other side. Instead of the grout material 17, concrete may be filled.

[Examples of other forms]
(1) In the above embodiment, both the upper surface and the lower surface of the female member 3 are set as open spaces, and after the male joint 4 is connected, the upper lid 13 and the lower lid 14 are installed on the lower surface and the upper surface of the female joint 3, respectively. However, the upper lid 13 (or lower lid 14) is installed on one side of the upper side or the lower side of the female member 3 at the time of manufacturing the precast floor slab according to the construction procedure. At the same time, concrete may be filled. For example, in the case of a construction procedure in which the male joint 4 is fitted from the upper side, as shown in FIG. 12, the lower side of the female joint 3 is previously closed with a lower lid 14, and the lower space LS is filled with concrete. You may. On the contrary, when the construction procedure is to fit the female joint 3 from the upper side, as shown in FIG. 13, the upper side of the female joint 3 is closed with the upper lid 13 in advance, and the upper space US is filled with concrete. You may. In these cases, the filling space of the grout material 17 is only one side of the upper space US and the lower space LS of the female joint 3. When the lower lid 14 or the upper lid 13 is attached in advance, it may be attached by welding instead of screws.
(2) In the above embodiment, the upper lid 13 and the lower lid 14 are firmly fixed by the screws 15, but when the female member 4 is die-cast, the upper lid 13 or the lower lid 14 on one side is the main body. It may be integrally molded with.

[Examples of other forms of the deformation restraining material 12]
In the above embodiment, as the deformation restraining material 12 of the vertical groove portion 3a, an example of the upper lid 13 provided in the upper surface opening of the groove-shaped cross-sectional member 3 and the lower lid 14 provided in the lower surface opening has been described. Various things can be used as. Hereinafter, examples of these forms (first to third examples) will be described in order.

<First example>
First, the first example will be described in detail with reference to FIGS. 14 to 16.

As for the groove-shaped cross-sectional member 3, as shown in FIG. 14, in order to install the deformation restraining material 12 only on the upper end side, the vertical groove 3a is not continuous to the lower end, but is stopped in the middle to form a U-shape. It is a vertical groove. Further, for the installation of the deformation restraining material 12, the first hooking recesses 3f and 3f are formed on the upper portions of the side portions 3A and 3A on both sides of the vertical groove 3a, and the second hooking recess is formed on the curved surface portion of the outer surface. 3e and 3e are formed.

As the deformation restraining material 12, as shown in FIG. 15, a width stopper 18 provided so as to connect both side portions of the vertical groove 3a to each other is used so that the vertical groove 3a does not open. Specifically, the width stopper 18 includes a horizontal member 18A and first hooking members 18a and 18b hanging downward from both ends of the horizontal member 18A, and two intermediate positions of the horizontal member 18A. The spacer member 18B is provided with the second hooking members 18c and 18d bent downward in an inverted L shape from the side surface, and extends downward from the lower surface of the two intermediate positions of the horizontal member 18A so as to also serve as a spacer. , 18C is a member integrally provided. The first hooking members 18a and 18b and the second hooking members 18c and 18d are provided with hooking claws for engaging with the hooking recesses 3f and 3e.

For attachment to the groove-shaped cross-section member 3, the first hooking members 18a and 18b of the width-stopping material 18 are hooked to the second hooking recesses 3e and 3e of the groove-shaped cross-section member 3, and the width-stopping material 18 is attached. The second hooking members 18c and 18d are fitted from above so as to be hooked on the second hooking recesses 3f and 3f of the groove-shaped cross-sectional member 3, and are installed in the state shown in FIG. As shown in FIG. 16A, notches 1a on both sides of the groove-shaped cross-sectional member 3 of the precast deck 1A are provided with a notch 1a on the gap M side for attaching the width stopper 18. Make sure to provide 1a.

In the case of the deformation restraining material 12 of the width fixing material type described above, the grout material 17 is filled in a state where the upper surface opening and the lower surface opening of the groove type cross-sectional member 3 are formed, so that the workability is improved. The spacer members 18B and 18c may be separated without being integrated.

<Second example>
Next, the second example will be described in detail with reference to FIGS. 17 to 19.

In the first example, the width stopper 18 is fixed by engaging the hook claw and the hook recess, but in the second example, the width stopper is fitted by fitting the groove-shaped cross-sectional member 3 into the notch. It is designed to fix.

As for the groove-shaped cross-sectional member 3, as shown in FIG. 17, in order to install the deformation restraining material 12 only on the upper end side, the vertical groove 3a is not continuous to the lower end, but is stopped in the middle to form a U-shape. It is a vertical groove. Further, for the installation of the deformation restraining material 12, a notch portion 3g or 3g is provided on the curved surface portion of the groove-shaped cross-sectional member 3 so as to be recessed from the upper surface.

As the deformation restraining material 12, as shown in FIG. 18, a width fixing material 19 provided so as to connect both side portions of the vertical groove 3a to each other is used so that the vertical groove 3a does not open. Specifically, the width stopper 19 includes the horizontal member 19A and the first stoppers 19a and 19b provided at both ends of the horizontal member 19A, and is T-shaped from the intermediate position side surface portion of the horizontal member 18A. The member is provided with the second stop portion 19c of the above, and is integrally provided with the spacer members 19B and 19C extending downward from the lower surface of the two intermediate positions of the horizontal member 19A so as to also serve as a spacer.

For attachment to the groove-shaped cross-section member 3, the first stopping portions 19a and 19b of the width-stopping material 19 are locked to the notches 3g and 3g of the groove-shaped cross-section member 3, and the width-stopping material 19 is attached to the second. The stopper 19c is fitted from above so as to be locked in the vertical groove 3a of the groove-shaped cross-sectional member 3, and is installed in the state shown in FIG. As shown in FIG. 19A, notches 1a on both sides of the groove-shaped cross-sectional member 3 of the precast deck 1A are provided with a notch 1a on the gap M side for attaching the width stopper 19. Make sure to provide 1a.

<Third example>
Further, the third example will be described in detail with reference to FIGS. 20 to 22.

As for the groove-shaped cross-sectional member 3, as shown in FIG. 20, in order to install the deformation restraining material 12 only on the upper end side, the vertical groove 3a is not continuous to the lower end, but is stopped in the middle to form a U-shape. It is a vertical groove. Further, for the installation of the deformation restraining material 12, screw screwing holes 3g are provided on the upper surfaces of the side portions 3A and 3A on both sides of the vertical groove 3a.

As the deformation restraining material 12, as shown in FIG. 21, a width fixing material 20 provided so as to connect both side portions 3A and 3A straddling the vertical groove 3a of the groove-shaped cross-sectional member 3 is used. Specifically, the width stopper 20 includes two spacer members 18B and 18C extending downward on the back side of the upper plate 20A, and also has locking hanging pieces 20a and 20b on the front side. It is a member provided with screw insertion holes 20c and 20d on both sides of the upper plate 20A, respectively.

As shown in FIG. 22, the vertical groove 3a is attached to the groove-shaped cross-sectional member 3 in the space between the spacer members 18B and 18C and the locking hanging pieces 20a and 20b while straddling the vertical groove 3a. When the screw holes 3A and 3A are fitted from above so as to be fitted, the screws 21 penetrated from the screw hole insertion 20c and 20d are screwed into the screw screw holes 3g of the groove-shaped cross-sectional member 3. Try to fix it by letting it.

<4th example>
Finally, the fourth example will be described in detail with reference to FIGS. 23 to 25.

As for the groove-shaped cross-sectional member 3, as shown in FIG. 23, in order to install the deformation restraining material 12 only on the upper end side, the vertical groove 3a is not continuous to the lower end, but is stopped in the middle to form a U-shape. It is a vertical groove, and no particular processing is performed to attach the deformation restraining material 12.

As the deformation restraining material 12, as shown in FIG. 24, both side portions 3A and 3A straddling the vertical groove 3a of the groove-shaped cross-sectional member 3 are provided on both sides of the connecting portion 23, respectively, on the front surface side and the back surface side, respectively. For sandwiching, a width stopper 22 provided with a side holding portion 25 by the front side holding plate 24A and the back side holding plate 24B is used with a gap corresponding to the thickness of the side side portion 3A. The front view shape of the width stopper 22 is a gate shape, and a space 26 through which the bridge axial reinforcing bar 8 is inserted is formed.

As shown in FIG. 25, the groove type cross-section member 3 is attached to the front side holding plate 24A and the back surface side holding plate 24A of the width stopper 22 while straddling the vertical groove 3a of the groove type cross-section member 3. It is fitted from above while being inserted into the gap between the side holding plate 24B. The fixing work of the width stopper 22 is unnecessary, and positioning is performed by pushing the upper portion of the space 26 of the width stopper 22 until it comes into contact with the bridge axial reinforcing bar 8. Further, a spacer 27 is arranged between the fixing member 9 of the male joint 4 and the width stopper 22 (the lower side is the side side portion 3A).

1.1A / 1B ... Concrete precast slab, 2 ... Fittings, 3 ... Female joints 3a ... Vertical grooves, 4 ... Male joints, 5.8 ... Bridge axial reinforcements, 6 ... Fasteners, 7 ... Angles, 9 ... Fixing member, 10 ... Nut, 11 ... Washer, 12 ... Deformation restraint material, 13 ... Upper lid, 14 ... Lower lid, 15 ... Screw, 16.27 ... Spacer, 17 ... Grout material, 18.19 / 20/22 ... Width stopper, 21 ... Screw, IS ... Internal space of female joint, US ... Upper space of female joint, LS ... Lower space of female joint, M ... Gap

Claims (9)

It is a joint structure for joining concrete precast decks to each other.
A female joint with a groove-shaped cross section in a plan view is buried in the joint end face of a concrete precast deck on one side of the joint at a predetermined interval in the horizontal direction, with the vertical groove facing the outside.
The tips of the bridge axial reinforcing bars are formed so as to protrude outward at predetermined intervals in the horizontal direction on the joint end face of the concrete precast floor slab on the other side of the joint, and are relative to the tips of these bridge axial reinforcing bars. A male joint with a large-diameter fixing member installed is buried.
The female joint of the concrete precast floor slab on one side is engaged with the male joint of the concrete precast floor slab on the other side, so that the concrete precast floor slabs are joined to each other and vertically to the female joint. With the deformation restraining material of the groove installed, the internal space of the female joint, the upper space and / or the lower space of the female joint, and the concrete precast floor slab on one side and the concrete precast floor slab on the other side. A concrete precast floor slab joint structure characterized by the fact that the gaps between the two are filled with ground material. The joint structure of a concrete precast deck according to claim 1, wherein the deformation restraining material of the vertical groove portion is an upper lid provided in the upper surface opening of the female joint and / or a lower lid provided in the lower surface opening of the female joint. The joint structure of a concrete precast deck according to claim 1, wherein the deformation restraining material of the vertical groove portion is a width stopper provided so as to connect both side walls of the female joint. The joint structure of a concrete precast deck according to claim 1, wherein the deformation restraining material of the vertical groove portion is a width retaining material provided so as to connect both side portions straddling the vertical groove of the female joint. The concrete according to claim 1, wherein the deformation restraining material of the vertical groove portion is a width retaining material having side holding portions for sandwiching both side portions of the female joint across the vertical grooves on the front surface side and the back surface side, respectively. Precast floor slab joint structure. The joint structure of a concrete precast deck according to any one of claims 1 to 5, wherein the female joint is made of a steel profile or die cast. The joint structure of a concrete precast deck according to any one of claims 1 to 6, wherein the male joint is provided in two stages in the vertical direction. The joint structure of a concrete precast deck according to any one of claims 1 to 7, wherein a spacer is disposed between the vertical groove of the female joint and the fixing member of the male joint inside the female joint. The joint structure of a concrete precast deck according to any one of claims 1 to 8, wherein the concrete is filled in place of the grout material.

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