JP2019039292A - Joint structure of concrete precast floor slab - Google Patents

Abstract

To provide a mechanical joint structure for a concrete precast floor slab which facilitates the stabilization of construction efficiency by making the alignment easier, and also intends to prevent the deformation of a vertical groove on a female joint in groove type cross section.SOLUTION: It is structured so that a female joint 3 of a concrete precast floor slab 1A on one side is engaged with a male joint 4 of a concrete precast floor slab 1B on the other side to couple the concrete precast floor slabs 1A and 1B together, and deformation restriction material 12 of a vertical groove part 3a is installed with respect to the female joint 3, so that the inner space IS of the female joint 3, the upper side space US and the lower side space LS of the female joint 3, and a clearance part M between the concrete precast floor slab 1A on one side and the concrete precast floor slab 1B on the other side are filled with a grout material 17.SELECTED DRAWING: Figure 3

Description

  The present invention eliminates the installation of reinforcing bars in the interstices and saves labor. In addition to the effect of reducing interstitial materials, the construction efficiency is stabilized by facilitating positioning, and the construction period can be greatly shortened. The present invention relates to a joint structure of a concrete precast slab.

  Conventionally, in a floor slab replacement work such as a bridge, a concrete precast floor slab manufactured at a factory or a site yard has been used to shorten the construction period. As a joint structure for connecting the concrete precast slabs, various structures have been proposed and put into practical use.

  The most commonly used joint structure is a so-called loop joint. As shown in FIG. 26, in this loop joint, the loop joint rebars 51 and 52 protruding in the bridge axis direction at different positions are arranged at appropriate intervals, and the loop joints 51 and 52 are perpendicular to each other. This is a joint structure 50 in which reinforcing bars 53 are inserted and cast-in place concrete 54 is placed in a space between precast floor slab bodies to connect adjacent precast floor slabs.

  In addition, since the application of the loop joint structure is based on the condition that the floor slab thickness is 240 mm or more, when the floor slab thickness is thinner than that, for example, “Rationalized Joint” shown in Patent Document 1 below. The joint structure called is used. As shown in FIG. 27, the “rationalized joint” does not use a loop reinforcing bar, and forms a fixing head 62 having a diameter larger than the diameter of the connecting reinforcing bar at the tip of the linear connecting reinforcing bar 61. In addition, on the side surfaces of the joints of the precast floor slab body, a large number of protrusions are provided on the upper edge side and the lower edge side in the horizontal direction at predetermined intervals, and the two joints of the precast floor slab bodies are connected within the joint space. This is a joint structure 60 in which cast-in-place concrete 64 is placed in the joint interval after the reinforcing bars 61, 61,... Are alternately arranged and overlapped in the horizontal direction and the reinforcing steel bars 63 are arranged at predetermined positions.

  Furthermore, various types of mechanical joints have been conventionally proposed in which the installation of reinforcing bars in the interstices is eliminated to save labor and the work period is shortened by reducing interstitial materials. For example, in addition to the simplest mechanical joint for fitting a male joint to a female joint fitting having a groove-shaped cross section, the following Patent Document 2 describes a plate-like concrete structure such as a concrete precast floor slab. It is a joint structure for joining together in a state aligned 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 part, and the inside is fitted A cylindrical first joint fitting having a substantially U-shaped cross section formed as a hole is connected to both joint ends of the concrete structure to be joined to each other, and the axis thereof is along the thickness direction of the concrete structure. Or embedded obliquely with respect to the thickness direction, with the upper opening facing the upper surface and the peripheral opening facing the joining end surface, with the fitting hole communicating with the outside through each opening. , The first fitting fitting The opening portions are opposed to each other, and in the facing state, the connecting portions extending around the opening portions of the first joint fitting and the both ends of the connecting portion are integrally formed, and are accommodated in the first fitting fitting and surrounded by the periphery. A second joint fitting having a fitting part that cannot be removed from the opening of each part, and each concrete structure that joins the fitting parts by inserting the fitting parts into the fitting holes of both first fitting fittings from the upper opening. A joint structure for a concrete structure is disclosed, which is formed by connecting and filling a solidifying material in a fitting hole and fixing the fitting portion of the first fitting fitting and the second fitting fitting. ing.

  Patent Document 3 below discloses a cotter-type joint device in which a C-type joint fitting having a lip groove-type groove hole is opposed to each other, and a cotter having an H-shaped cross section is inserted into a groove hole combined with each other into an H-shape. In this case, a bolt hole is opened in the vicinity of the center portion of the left and right flange portions of the H-shaped cotter, and a bottom surface portion having a predetermined thickness is formed on the C-type fitting. 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 Patent Laying-Open No. 2015-1045 Japanese Patent Laid-Open No. 7-71195 JP 2001-214694 A

  The mechanical joint structure described above is superior to the others in that the construction period can be shortened to minimize restrictions due to lane restrictions and traffic restrictions, and to minimize the impact 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 floor slab erection in order to insert an H-type cotter, and it is difficult to insert the cotter. When such a situation occurs, there is a problem that the process is greatly delayed.

  Further, in the case of a mechanical joint of a type in which a male joint is fitted to the female joint fitting of the groove type cross section, when an excessive tensile force acts on the male joint, the vertical groove of the female joint is supported on the opening side. Therefore, there is a problem that it is easily deformed in the opening direction. Furthermore, the so-called “cotter type joints” as in Patent Documents 2 and 3 have a problem that the production cost is high and the influence on the construction cost is large.

  Therefore, the main problem of the present invention is to save labor by eliminating the installation of reinforcing bars in the interstices, and in addition to effects such as reduction of interstitial materials, the construction efficiency is stabilized by facilitating alignment, etc. It is an object of the present invention to provide a mechanical joint structure of a concrete precast floor slab capable of shortening the work period and preventing deformation of a longitudinal groove in a female joint having a groove-type cross section.

In order to solve the above problems, the present invention according to claim 1 is a joint structure for joining concrete precast slabs,
At the joint end face of the concrete precast slab on one side with the joint as a boundary, the female joint of the groove type cross section is embedded in the horizontal direction at a predetermined interval with the longitudinal groove facing the outside in a plan view,
At the joint end surface of the concrete precast floor slab on the other side of the joint, the ends of the bridge axis rebars protrude outward at a predetermined interval in the horizontal direction, and relative to the ends of these bridge axis rebars A male joint with a large-diameter fixing member is buried,
The male joint of the concrete precast floor slab on one side is engaged with the female joint of the concrete precast floor slab on the other side so that the concrete precast floor slabs are connected to each other. With the deformation restraining material in the groove installed, the internal space of the female joint and the upper and / or lower space of the female joint, the concrete precast slab on one side and the concrete precast slab on the other side There is provided a joint structure of a concrete precast slab, characterized in that a grout material is filled in the gap portion of the concrete.

  In the first aspect of the present invention, a female joint having a groove-type cross section is embedded in a concrete precast floor slab on one side with the joint portion as a boundary, with the longitudinal groove facing the outside in 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 the female joint and the male joint are engaged with each other so that the concrete precast slabs are connected to each other, and With the deformation restraining material of the groove portion installed, the internal space of the female joint and the upper space and / or lower space of the female joint, the concrete precast floor slab on one side, and the concrete precast floor slab on the other side Grout material is filled in the gap portion.

  Since it has a simple engagement structure with the female joint of the groove type cross section and the rod-shaped male joint, the tolerance of error is large, and it becomes possible to easily align the position by absorbing manufacturing errors and construction errors. The construction period can be greatly shortened. Further, since the deformation restraining material for the longitudinal groove portion is installed on the female joint, it is possible to reliably prevent the longitudinal groove portion of the female joint from being deformed 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 slab on one side and the concrete precast slab on the other side. In addition, the filling amount of the grout material can be reduced, and the working time and the construction cost can be reduced.

  According to a second aspect of the present invention, the deformation restraining material of the longitudinal groove portion is an upper lid provided on the upper surface opening of the female joint and / or a lower lid provided on the lower surface opening of the female joint. A joint structure of a precast slab made of steel is provided.

  The invention according to the second aspect defines a specific example of the longitudinal groove portion as a deformation restraining material. Specifically, the deformation restraining material for the longitudinal groove portion may be an upper lid provided on the upper surface opening of the female joint and / or a lower lid provided on the lower surface opening of the female joint.

  The joint structure of a concrete precast slab according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is a width stopper provided so as to connect both side wall surfaces of the female joint. Is provided.

  The invention described in claim 3 defines another specific example as a deformation restraining material for the longitudinal groove. Specifically, the deformation restraining material for the longitudinal groove portion can be a width stop material provided so as to connect both side wall surfaces of the female joint.

  The present invention according to claim 4 is the concrete precast according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is a width stop material provided so as to connect both side portions straddling the longitudinal groove of the female joint. A floor slab joint structure is provided.

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

  As a fifth aspect of the present invention, the deformation restraining member for the longitudinal groove portion is a width stopper provided with side edge clamping portions that sandwich both side portions straddling the longitudinal groove of the female joint between the front surface side and the back surface side, respectively. A joint structure for a concrete precast slab according to claim 1 is provided.

  The invention according to claim 5 defines another specific example as a deformation restraining material for the longitudinal groove. Specifically, as the deformation restraining material of the longitudinal groove portion, a width stop material provided with side edge clamping portions that sandwich both side portions straddling the longitudinal groove of the female joint between the front surface side and the back surface side, respectively. it can.

  According to a sixth aspect of the present invention, there is provided the joint structure of a concrete precast slab according to any one of the first to fifth aspects, wherein the female joint is manufactured by a steel profile or die casting.

  In the invention described in claim 6, the material of the female member is defined. As a female member, it is desirable to manufacture it by a steel profile or die-cast.

  As a seventh aspect of the present invention, there is provided the joint structure of a concrete precast slab according to any one of the first to sixth aspects, wherein the male joint is provided in two stages in the vertical direction.

  In the invention according to the seventh aspect, 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 cope with the compressive force and tensile force caused by bending.

  As the present invention according to claim 8, in the interior of the female joint, a spacer is disposed between the vertical groove of the female joint and the fixing member of the male joint. A precast slab joint structure is provided.

  In the invention according to claim 8, a spacer is disposed inside the female joint between the vertical groove of the female joint and the fixing member of the male joint. As a result, the force can be reliably transmitted between the female joint and the male joint.

  As this invention which concerns on Claim 9, it replaces with the said grout material, and the joint structure of the concrete precast floor slabs in any one of Claims 1-8 filled with concrete is provided.

  In the invention according to the ninth aspect, concrete is filled instead of the grout material in order to reduce the construction cost.

  As described above in detail, according to the present invention, the installation of reinforcing bars in the clogging portion is eliminated to save labor, and in addition to the effects such as reduction of the clogging material, the construction efficiency is stabilized by facilitating alignment, etc. It is possible to provide a mechanical joint structure of a concrete precast floor slab that can significantly reduce the work period and prevent deformation of the longitudinal groove in the female joint of the groove type cross section.

It is a top view which shows the coupling part 2 of concrete precast floor slabs 1A and 1B. It is the principal part enlarged view (A section of FIG. 1). It is a longitudinal cross-sectional view (III-III sectional view of FIG. 1) of the joint part 2. 3 is a perspective view of a floor slab showing a female joint 3. FIG. 3 is an enlarged plan view of a main part showing a female joint 3. FIG. 3 is an enlarged vertical sectional view showing a main part of a female joint 3. FIG. The groove type cross-section 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 showing a male joint 4. FIG. 4 is an enlarged plan view of a main part showing a male joint 4. It is a connection procedure figure (A) (B) of a concrete precast slab. FIG. 4 is a procedure diagram (A) to (C) for joining precast slabs. FIG. 6 is a longitudinal sectional view showing a modified example (No. 1) of the female joint 3; FIG. 6 is a longitudinal sectional view showing a modified example (No. 2) of the female joint 3. It is a perspective view which shows the groove type cross-section member 3 for applying the 1st example (width stop material 18) of the deformation | transformation restraint material 12. FIG. It is a perspective view which shows the width stop material. The attachment state of the width stopper 18 is shown, (A) is a plan view and (B) is a longitudinal sectional view. It is a perspective view which shows the groove type cross-section member 3 for applying the 2nd example (width stop material 19) of the deformation | transformation restraint material 12. FIG. It is a perspective view which shows the width stop material 19. FIG. The attachment state of the width stop material 19 is shown, (A) is a plan view and (B) is a longitudinal sectional view. It is a perspective view which shows the groove type cross-section member 3 for applying the 3rd example (width stop material 20) of the deformation | transformation restraint material 12. FIG. It is a perspective view which shows the 3rd example (width stop material 20) of the deformation | transformation restraint material 12. FIG. The attachment state of the width stop material 20 is shown, (A) is a plan view and (B) is a longitudinal sectional view. It is a perspective view which shows the groove type cross-section member for applying the 4th example (width stop material 22) of the deformation | transformation restraint material 12. FIG. It is a perspective view which shows the 4th example (width stop material 22) of the deformation | transformation restraint material 12. FIG. The attachment state of the width stop material 22 is shown, (A) is a plan view and (B) is a longitudinal sectional view. It is a longitudinal cross-sectional view which shows the conventional loop coupling. It is a longitudinal cross-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 slabs (hereinafter simply referred to as precast slabs). In general, in the case of mechanical joints, compared to conventional loop joints and rationalized joints, the installation of reinforcing bars in the interstitial part is eliminated, so that labor can be saved and the work period can be greatly shortened by reducing interstitial materials. However, there are disadvantages such as the joint itself is expensive and expensive, and high accuracy is required for alignment. Therefore, the present invention proposes a mechanical joint structure that has a simple structure mechanical joint and that can absorb a predetermined amount of error and is excellent in alignment workability.

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

  This will be described in more detail below.

  First, the female joint 3 provided on the one-side precast floor slab 1A will be described in detail with reference to FIGS.

  As shown in detail in FIG. 7, the female joint 3 is a member made of steel or die-casting having a groove-shaped cross section in plan view (hereinafter also referred to as a groove-shaped cross-sectional member). It is. The width dimension B and the depth dimension C of the groove-type cross-sectional member 3 are approximately 80 to 150 mm, preferably 100 to 130 mm. The length dimension H of the groove-type 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 longitudinal groove 3a formed in the center. S is set to 15 to 30 mm, preferably 18 to 25 mm, and is set to 110 to 150%, preferably 120 to 140%, with respect to the diameter of the bridge axial rebar 8 constituting the male joint 4 described later. The ratio of the male joint 4 to the diameter is preferably set to an appropriate size range since the tolerance of manufacturing error or construction error is closely related. Further, if this ratio is excessively increased, the engagement between the male joint 4 and the fixing member 9 is reduced, and the force transmission efficiency is deteriorated.

  As shown in FIG. 7, through-holes 3 b and 3 b for inserting reinforcing bars are formed in the rear side wall surface 3 </ b> C of the groove-type cross-sectional member 3 in an upper and lower two-stage arrangement in the illustrated example. Also, an appropriate number of screw screw holes 3c, 3d,... For fixing an upper lid 13 and a lower lid 14, which will be described later, with screws are formed on the upper surface and the lower surface, respectively. In order to prevent the vertical groove 3a from opening and deforming, about six places in total are provided, two on each side 3A, 3A of the vertical groove 3a, two on both side walls 3B, 3B, and two on the back side wall 3C. It is desirable to do.

  As shown in FIG. 4, the groove-shaped cross-section member 3 is installed at a predetermined interval in the horizontal direction, specifically at an interval of about 100 to 300 mm, and the longitudinal groove 3 a is formed when the precast floor slab 1 </ b> A is manufactured. While facing the outside, the upper part and the lower part are each buried in an open state. Preferably, as shown in FIG. 6, it is installed at a central position with respect to the height direction of the floor slab, and as shown in FIG. 3, the internal space IS of the female joint 3 and the upper side of the female joint 3 Each of the space US and the lower space LS is a space filled with the grout material 17.

  As shown in FIG. 1, the groove-type cross-sectional member 3 is firmly fixed by a reinforcing bar 5 embedded in a floor slab. As shown in FIGS. 5 and 6, the end portion of the bridge axis direction reinforcing bar 5 embedded in the frame slab is inserted into the through holes 3 b and 3 b of the groove-type cross-sectional member 3, and the groove-type cross-sectional member 3. It is being fixed by the fastener 6 which consists of a washer and a nut member each arrange | positioned on both sides which straddle 3C of back side walls. In addition, you may make it perform the connection of the bridge axial direction reinforcement 5 with respect to the said groove type cross-section member 3 by welding.

  As shown in FIG. 1, in the floor slab housing near the embedding portion of the groove-type cross-section member 3, in addition to the bridge-axis-direction reinforcing bars 5 for fixing the groove-type cross-section member 3, the bridge-axis direction reinforcing bars Further, the bridge axis perpendicular reinforcement bars, the bridge axis perpendicular PC steel wires, and the like may be arranged in the cross direction so as to be firmly reinforced.

  In order to embed the groove-type cross-sectional members 3 with a predetermined number of portions with high accuracy and efficiency, an angle 7 is provided on the back side of the plurality of groove-type cross-sectional members 3, 3. 3 are connected to each other. The angle 7 serves as a ruler, and concrete is placed in a state where the plurality of groove-type cross-sectional members 3, 3... Are fixed at accurate positions. The angle 7 can be omitted.

  Next, the male joint 4 provided on the other precast slab 1B will be described in detail with reference to FIGS.

  In the male joint 4, the ends of the bridge axis direction reinforcing bars 8 protrude from the joint surface to the outside, and the fixing member 9 is installed at the ends of the bridge axis direction reinforcing bars 8. In the illustrated example, the fixing member 9 includes a nut 10 and a washer 11 provided at an adjacent position. The washer 11 can be omitted.

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

  As shown in FIG. 1, in the floor slab housing near the buried portion of the bridge axis direction reinforcing bar 8, in addition to the bridge axis direction reinforcing bar 8, the bridge axis direction reinforcing bar, the bridge axis perpendicular reinforcing bar, the bridge axis You may make it reinforce firmly by arrange | positioning a perpendicular direction PC steel wire etc. to a cross direction.

  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 longitudinal groove 3a of the female joint 3, that is, the fixing member. 9 is positioned inside the female joint 3, and the two precast slabs 1A and 1B are combined with the bridge axial direction reinforcing bar 8 inserted into the longitudinal groove 3a. Further, when the tensile force acts on the joint portion 2, the deformation restraining material 12 of the vertical groove portion 3 a is installed on the female joint 3 so that the vertical groove 3 a of the female joint 3 does not open.

  The deformation restraining material 12 includes an upper lid 13 provided so as to close the upper surface opening of the groove-type cross-sectional member 3 and a lower lid 14 provided so as to close the lower surface opening of the groove-type 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.

  In the present embodiment, as shown in FIGS. 2 and 3, a spacer 16 is provided between the longitudinal groove 3 a of the female joint 3 and the fixing member 9. Since it is also assumed that force transmission is not smoothly performed when the overlap margin between the fixing member 9 and both side portions forming the vertical groove 3a is not sufficiently secured, the spacer 16 is provided to install the vertical groove. It is desirable to ensure a sufficient overlap margin with both side portions forming 3a. The spacer 16 is not necessarily in contact with both side portions forming the vertical groove 3a, the grout material 17 is interposed therebetween, and the deformation restricting material 12 is prevented so that the vertical groove 3a is not deformed. It is considered that the tensile force can be sufficiently transmitted through the grout material 17 if it is restrained by the grout material 17, but the grout material 17 may be pulverized due to repeated shearing force. It is desirable to make it contact with the side part which forms 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, the precast floor slab on one side, and the precast floor slab on the other side The gap portion M is filled with a grout material 17.
[Guidelines for slab 1]
In the above embodiment, the description has been given on the assumption that the female joint 3 is provided on the joint end surface of the one side precast floor slab and the male joint 4 is provided on the joint end surface of the other side precast floor slab. When three or more are joined, as shown in FIG. 10, a female joint 3 is provided on one opposing surface of one rectangular precast floor slab 1 and a male joint is provided on the other opposing surface. The joint 4 is provided, and the precast floor slabs 1, 1,... Are installed by a procedure of sequentially joining the precast floor slabs.

  Specifically, as shown in FIG. 10 and FIG. 11 (A), the male joint 4 of the next precast floor slab 1 is vertically oriented with respect to the female joint 3 of the precast floor slab 1 that has been installed. The precast floor slab 1 is installed and the two are aligned while being dropped. Since the present invention has a simple fitting structure with the female joint 3 using the groove-shaped cross-section member and the bridge axial direction reinforcing bar 8 provided with the fixing member 9, the tolerance of the error is large, and the manufacturing error and the construction error are reduced. It can be easily absorbed and aligned.

  Next, as shown in FIG. 11 (B), the spacer 16 is provided between the longitudinal groove 3a of the female joint 3 and the fixing member 9, and sufficient for both side portions forming the longitudinal groove 3a. If the overlap margin is secured, 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. The upper lid 13 is preferably provided with air holes for filling the grout material 17.

  When the operations up to the above procedure are 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 the one side The grout material 17 is filled in a gap portion M between the precast floor slab and the other side of the precast floor slab. In place of the grout material 17, concrete may be filled.

[Other examples]
(1) In the above embodiment, the upper surface and the lower surface of the female member 3 are both open spaces, and after the male joint 4 is coupled, 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 the lower lid 14) is installed on one side of the upper side or the lower side of the female member 3 during the production of 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 for fitting the male joint 4 from above, as shown in FIG. 12, the lower side of the female joint 3 is previously closed with the lower lid 14 and the lower space LS is filled with concrete. May be. On the other hand, when the construction procedure is to fit the female joint 3 from above, as shown in FIG. 13, the upper side of the female joint 3 is previously closed with the upper lid 13 and the upper space US is filled with concrete. May be. 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. In addition, when attaching the lower cover 14 or the upper cover 13 previously, you may make it attach by welding instead of a screw | thread.
(2) In the above embodiment, the upper lid 13 and the lower lid 14 are firmly fixed by the screws 15. However, when the female member 4 is manufactured by die casting, the upper lid 13 or the lower lid 14 on one side is the main body. You may make it shape | mold integrally.

[Other Examples of Deformation Restraint Material 12]
Although the example of the upper lid 13 provided in the upper surface opening of the groove-type cross-section member 3 and the lower lid 14 provided in the lower surface opening has been described as the deformation restricting material 12 of the longitudinal groove portion 3a in the above embodiment, the deformation restricting material 12 Various types can be used. Hereinafter, those form examples (first to third examples) will be described in order.

<First example>
First, a 1st example is explained in full detail based on FIGS.

  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 stopped halfway up to the lower end and stopped in the middle. It is a vertical groove. Further, in order to install the deformation restraining material 12, first latching recesses 3f and 3f are formed on the upper sides of both side portions 3A and 3A of the longitudinal groove 3a, and a second latching 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 so as not to open the vertical groove 3a is used. Specifically, the width stopper 18 includes a horizontal member 18A and first latching members 18a and 18b that hang downward from both ends of the horizontal member 18A, and two intermediate positions of the horizontal member 18A. Spacer member 18B provided with second latching members 18c and 18d bent downward in an inverted L shape from the side surface and extending downward from the bottom surfaces of the two intermediate positions of horizontal member 18A in order to also serve as a spacer , 18C are integrated members. The first hook members 18a and 18b and the second hook members 18c and 18d are provided with hook claws for engaging with the hook recesses 3f and 3e.

  The groove-type cross-section member 3 is attached to the first hook members 18a, 18b of the width stopper 18 by the second hook recesses 3e, 3e of the groove-type cross-section member 3 and The second hooking members 18c and 18d are fitted from above so as to be hooked in the second hooking recesses 3f and 3f of the groove-type cross-sectional member 3, and are installed in the state shown in FIG. In addition, on both sides of the groove-type cross-sectional member 3 of the precast floor slab 1A, as shown in FIG. 16 (A), notches 1a, 1a is provided.

  In the case of the deformation restraining material 12 of the width stop 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, a second example will be described in detail based on FIGS.

  In the first example, the width stopper 18 is fixed by engaging the latching claw and the latching recess. In the second example, the width stopper is fixed by fitting the groove-shaped cross-section member 3 into the notch. Is fixed.

  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 stopped halfway up to the lower end and stopped in the middle. It is a vertical groove. Further, in order to install the deformation restraining material 12, notches 3g and 3g are provided in the curved surface portion of the groove-type 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 stop material 19 provided so as to connect both side portions of the vertical groove 3a to each other so that the vertical groove 3a does not open is used. Specifically, the width stopper 19 includes a horizontal member 19A and first stoppers 19a and 19b provided at both ends of the horizontal member 19A, and has a T-shape from a side surface portion at an intermediate position of the horizontal member 18A. The second stopper 19c is a member integrally provided with spacer members 19B and 19C extending downward from the lower surfaces of the two intermediate positions of the horizontal member 19A in order to also serve as a spacer.

  For attachment to the groove-type cross-section member 3, the first stop portions 19a, 19b of the width-stop member 19 are locked to the notches 3g, 3g of the groove-type cross-section member 3, and the second stop portion 19 of the width-stop member 19 is attached. The stopper 19c is fitted from above so as to be engaged with the longitudinal groove 3a of the groove-type cross-sectional member 3, and installed in the state shown in FIG. In addition, on both sides of the groove-type cross-sectional member 3 of the precast floor slab 1A, as shown in FIG. 19 (A), notches 1a, 1a is provided.

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

  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 stopped halfway up to the lower end, and stopped in the middle. It is a vertical groove. Further, for installation of the deformation restraining material 12, screw screw holes 3g are provided on the upper surfaces of both side portions 3A, 3A of the longitudinal groove 3a.

  As the deformation restraining material 12, as shown in FIG. 21, a width stop material 20 provided so as to connect both side portions 3A, 3A across the longitudinal groove 3a of the groove-type 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 has locking hanging pieces 20a and 20b on the front side. This is a member provided with screw insertion holes 20c, 20d on both sides of the upper plate 20A.

  As shown in FIG. 22, the groove-shaped cross-section member 3 is attached to the vertical groove 3a in the space between the spacer members 18B and 18C and the locking hanging pieces 20a and 20b while straddling the vertical groove 3a. If the two side portions 3A and 3A are fitted from above, the screws 21 inserted through the screw hole insertions 20c and 20d are screwed into the screw screw holes 3g of the groove-type cross-sectional member 3. To fix it.

<Fourth example>
Finally, the fourth example will be described in detail with reference to FIGS.

  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 stopped halfway up to the lower end and stopped in the middle. It is a vertical groove, and the processing for attaching the deformation restraining material 12 is not particularly performed.

  As the deformation restraining material 12, as shown in FIG. 24, both side portions 3A and 3A straddling the longitudinal groove 3a of the groove-shaped cross-section member 3 are respectively provided on both sides of the connecting portion 23 on the front side and the back side. In order to clamp, the width stop material 22 provided with the side clamping part 25 by the front side clamping board 24A and the back side clamping board 24B is used with a gap corresponding to the thickness of the side part 3A. The front-view shape of the width stop member 22 has a gate shape, and a space 26 through which the bridge axis direction reinforcing bar 8 is inserted is formed.

  As shown in FIG. 25, the groove-type cross-section member 3 is attached to both the side portions 3A on the front side holding plate 24A and the back surface of the width stop material 22 while straddling the longitudinal groove 3a of the groove-type cross-section member 3. It is inserted from the upper side while being inserted into the gap between the side clamping plates 24B. The fixing work of the width stop material 22 is not necessary, and positioning is performed by pushing the upper portion of the space 26 of the width stop material 22 until it comes into contact with the bridge axis direction reinforcing bar 8. Further, a spacer 27 is disposed between the fixing member 9 of the male joint 4 and the width stopper 22 (the lower side is the side portion 3A).

  1 · 1A · 1B ··· Precast concrete slab, 2 ··· Joint portion, 3 ······························································ ... 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 stop material, 21 ... Screw, IS ... Internal space of female joint, US ... Upper space of female joint, LS ... Lower space of female joint, M ... Gap

Claims (9)

A joint structure for joining concrete precast slabs,
At the joint end face of the concrete precast slab on one side with the joint as a boundary, the female joint of the groove type cross section is embedded in the horizontal direction at a predetermined interval with the longitudinal groove facing the outside in a plan view,
At the joint end surface of the concrete precast floor slab on the other side of the joint, the ends of the bridge axis rebars protrude outward at a predetermined interval in the horizontal direction, and relative to the ends of these bridge axis rebars A male joint with a large-diameter fixing member is buried,
The male joint of the concrete precast floor slab on one side is engaged with the female joint of the concrete precast floor slab on the other side so that the concrete precast floor slabs are connected to each other. With the deformation restraining material in the groove installed, the internal space of the female joint and the upper and / or lower space of the female joint, the concrete precast slab on one side and the concrete precast slab on the other side A joint structure of a concrete precast slab, characterized in that a grout material is filled in the gap portion of the concrete.   The joint structure of a concrete precast floor slab according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is an upper lid provided in an upper surface opening of the female joint and / or a lower lid provided in a lower surface opening of the female joint.   The joint structure of a concrete precast floor slab according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is a width stopper provided so as to connect both side wall surfaces of the female joint.   The joint structure of a concrete precast floor slab according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is a width stop material provided so as to connect both side portions straddling the longitudinal groove of the female joint.   2. The concrete according to claim 1, wherein the deformation restraining material of the longitudinal groove portion is a width stop material provided with side edge sandwiching portions that sandwich both side portions straddling the longitudinal groove of the female joint between the front surface side and the back surface side. Joint structure of precast slab made of steel.   The joint structure of a concrete precast slab according to any one of claims 1 to 5, wherein the female joint is manufactured by a steel profile or die-cast.   The joint structure of a concrete precast slab according to any one of claims 1 to 6, wherein the male joints are respectively provided in a two-stage arrangement in the vertical direction.   The joint structure of a concrete precast slab according to any one of claims 1 to 7, wherein a spacer is disposed between the longitudinal groove of the female joint and the fixing member of the male joint inside the female joint.   The joint structure of a concrete precast floor slab according to any one of claims 1 to 8, wherein concrete is filled instead of the grout material.

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