JP2020041332A - Precast concrete foundation block and joint structure for the same - Google Patents

Abstract

To provide a precast concrete foundation block and joint structure for the same in which a position of a screwed flange is freely adjusted with respect to joint main reinforcements, and that can easily establish a desired position relationship between the screwed flange and a hollow joint member that connects right and left joint main reinforcements.SOLUTION: A precast concrete foundation block 10 forms the raised section of a foundation. Part of a top reinforcement 11 and a vertical reinforcement 13, which are arranged in the foundation extending direction, are embedded in concrete 15. On an end 16 of the precast concrete foundation block 10 in the extending direction, a first recess 17 is provided in a position corresponding to the top reinforcement 11. One end of a joint main reinforcement 20, which overlaps the top reinforcement 11 in the concrete 15 by the length of an overlap joint, protrudes toward the first recess 17, and an end of the joint main reinforcement 20 is provided with a screw groove 21 and a screwed flange 30 is screwed to the screw groove 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a precast concrete foundation block and its joint structure.

  In the foundation of the building, in order to shorten the construction period of the foundation and increase the dimensional accuracy of the foundation, the rising part of the foundation is manufactured as a precast concrete foundation block at the factory, and this precast concrete foundation block is transported to the construction site and The construction method used for construction is applied. By laying a plurality of precast concrete foundation blocks conveyed to the construction site in the direction of extension of the foundation, under the rising part by the precast concrete foundation block, by performing footing on the site so as to be integrated with the rising part, The construction period of a foundation such as a cloth foundation can be significantly reduced.

  Precast concrete foundation blocks with male joints at both ends or one end, female joints at both ends or one end, or male joints at one end A precast concrete foundation block having a metal fitting and a female joint fitting at the other end has been proposed (for example, see Patent Document 1).

  However, the block described in Patent Literature 1 has a problem that the construction procedure is fixed. That is, since the adjacent precast concrete foundations are connected to each other by the male joint and the joint of the female joint, the precast concrete foundation having the female joint is arranged first, and then the male joint is formed. It is necessary to fit the precast concrete foundation having the mold fitting to the female joint fitting of the precast concrete foundation placed earlier. Furthermore, since a male joint and a female joint are required, there are also problems such that the types of the brackets increase, the cost increases, and the production efficiency decreases.

  Therefore, in order to solve these problems, a first recess and a second recess for filling the grout material formed at a location where the foundations are joined to each other, and an anchor bar having a rod-shaped body connected to the upper bar are provided. The distal end side of the streak is exposed in the first concave portion, a convex portion protruding from the rod-shaped main body is formed at the distal end side of the anchor streak, and the convex portion is formed by a joining member having a fitting portion fitted into both convex portions. A joint structure for connecting the two has been proposed. According to this joint structure, the convex portions are present on the distal ends of the opposite anchor bars of the precast concrete foundations to be joined, and since there is no male-female relationship, the order of foundation installation is not fixed (for example, And Patent Document 2).

JP 2013-227787 A JP-A-2017-066598

  Patent Literature 2 describes that a protruding portion is integrally formed on a rod-shaped main body of an anchor bar using a forging technique. However, when the protrusion is integrally formed on the rod-shaped main body of the anchor bar by forging, it is difficult to secure the dimensional accuracy of the protrusion. Also, at the site, when dropping the joining member from above both convex portions at the ends of the anchor bars extending from the left and right precast concrete foundation blocks and fitting both convex portions into the fitting portions, Since the convex portion is fixed to the end of the muscle, it is difficult to adjust the position of the convex portion in the longitudinal direction of the anchor muscle.

  Further, after the left and right convex portions are accommodated in the fitting portion of the joining member, the first concave portion and the second concave portion are filled with the grout material. A clearance of several mm or less that allows the protruding portion and the inner end face of the joining member to be in close contact with each other to make clear zero, or that the grout material can enter between the protruding portion and the inner end face of the joining member. Is desirably provided. However, it is possible to accommodate the convex portion in the fitting portion of the joining member in a state where the convex portion and the inner end face of the joining member are in close contact with each other, or to attach the joining member in a state having a gap of several mm or less. It is extremely difficult to accommodate the convex part in the fitting part.

  The present invention has been made in view of the above-described problems, and relates to a precast concrete foundation block that forms an upright portion of a foundation, with respect to a member corresponding to the above-described anchor bar, and a member corresponding to the above-described convex portion. An object of the present invention is to provide a precast concrete foundation block in which the position can be easily adjusted and the dimensional accuracy of a member corresponding to a convex portion is high, and a joining structure using the precast concrete foundation block.

In order to achieve the above object, one embodiment of the precast concrete foundation block according to the present invention is:
A precast concrete foundation block forming a rising part of the foundation,
An upper reinforcement and a lower reinforcement extending in the extending direction of the foundation, and a vertical reinforcement connecting the upper reinforcement and the lower reinforcement in a vertical direction, wherein the upper reinforcement and a part of the vertical reinforcement are embedded in concrete. And
Of the end portions of the precast concrete foundation block in the extending direction, a first recess is provided at a position corresponding to the upper end bar,
In the concrete, one end of the joint main bar that overlaps the upper end bar and overlaps the joint length projects into the first recess,
A thread groove is provided at the one end of the joint main bar, and a threaded flange is screwed into the thread groove.

  According to this aspect, a thread groove is provided at one end of the joint main bar that overlaps with the upper end bar and overlaps the joint length, and the threaded flange is screwed into the thread groove, so that the joint main bar is squeezed. The position of the threaded flange can be adjusted freely. For this reason, two precast concrete foundation blocks are installed at the site, and the positional relationship between the threaded flange screwed to the joint main bar projecting from both first concave portions and the joining member connecting them is a desired positional relationship. Even when there is no connection, by adjusting the position by rotating the threaded flange with respect to the joint main bar, it is possible to easily set the joining member and the threaded flange in a desired positional relationship on site. Become. That is, by rotating the threaded flange relative to the joint main bar while rotating it, the threaded flange can be easily brought into close contact with the joining member, and the gap between the joining member and the threaded flange can be easily adjusted. It is also possible to form a positional relationship between the two with a gap that can be filled with the grout material. Here, the threaded flange includes a nut. The dimensional accuracy of the nut is significantly higher than that of the convex portion formed by the forging described above.

Further, one embodiment of the joint structure of the precast concrete foundation block according to the present invention,
The end portions of the two precast concrete foundation blocks are in contact with each other, and the first concave portions of both are continuous to form a second concave portion,
Ends of the joint main reinforcement extending from the left and right are inserted into the insertion holes of the hollow joint member having insertion holes at the left and right ends, and the threaded flange provided in the hollow is connected to the joint main reinforcement. The hollow portion and the second concave portion are filled and hardened with a grout material by being screwed to the end portion.

  According to this aspect, for the hollow joint member provided in the second concave portion formed by the first concave portion of the two precast concrete foundation blocks, both of the two members extending from the left and right and inside the hollow joint member are provided. At the end of the joint main bar, the joining member and the threaded flange can be adjusted to a desired positional relationship while moving the threaded flange.

  Another embodiment of the joining structure of a precast concrete foundation block according to the present invention has a gap between the hollow inner wall surface of the joining member and the flange to be screwed, and the grout material is provided in the gap. Are filled and cured.

  According to this aspect, by moving the threaded flange as desired, a predetermined gap that can be filled with a grout material is formed between the hollow inner wall surface of the joining member and the threaded flange. You. Therefore, for example, the axial force that has flowed through the upper end bar of one of the left and right precast concrete foundation blocks and the joint main bar is transmitted to the joining member via the grout material filled and hardened in this gap, and the joining member is Through this, a series of axial force transmission to the joint main reinforcement and upper end reinforcement of the left or right precast concrete foundation block is effectively performed.

  Further, another aspect of the joining structure of the precast concrete foundation block according to the present invention is characterized in that the hollow inner wall surface of the joining member and the threaded flange are in close contact with each other.

  According to this aspect, by moving the threaded flange as desired, the hollow inner wall surface of the joining member and the threaded flange can be completely brought into close contact with each other. Therefore, also in this embodiment, the above-described series of transmission of the axial force is effectively performed.

In another aspect of the joining structure of the precast concrete foundation block according to the present invention, the joining member has an opening communicating with the hollow,
The opening is an insertion port for inserting the threaded flange into the hollow, and is used for adjusting the position of the threaded flange by screwing the threaded flange to an end of the joint main reinforcement. It is a feature that it is an adjustment opening for.

  According to this aspect, since the joining member has the opening communicating with the hollow, the threaded flange can be inserted into the hollow through the opening, and further, the joint main reinforcement in the hollow can be inserted. It is possible to precisely adjust the position by moving the threaded flange to the end.

  As can be understood from the above description, according to the precast concrete foundation block and the joint structure of the present invention, the position of the threaded flange can be freely adjusted with respect to the joint main bar, and the hollow joint member that connects the left and right joint main bars. A desired positional relationship between the and the threaded flange can be easily formed.

It is a longitudinal section of an example of a precast concrete foundation block concerning an embodiment. FIG. 2 is a vertical sectional view taken along line II-II of FIG. 1 and orthogonal to FIG. 1. It is a longitudinal section showing an example of the joining structure of the precast concrete foundation block concerning an embodiment, and is a figure showing both a precast concrete foundation and a cloth foundation formed by a field construction foundation. FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3. FIG. 5 is a view on arrow VV of FIG. 4. It is a perspective view of an example of a joining member, and is a figure explaining the situation where the end of the joint main bar is inserted in the hollow of the joining member, and the threaded flange is inserted in the hollow through the opening. It is a figure which demonstrates the positional adjustment of the threaded flange in the hollow of a joining member, and shows an example of the positional relationship of the hollow inner wall surface of a joining member and the threaded flange. It is a figure explaining the state where the grout material is filled and hardened in the 2nd recessed part in the positional relationship between the joining member and the threaded flange shown in FIG. It is a figure which demonstrates position adjustment of the to-be-threaded flange in the hollow of a joining member, and shows the other example of the positional relationship of the to-be-engaged flange and the hollow inner wall surface of a joining member. FIG. 10 is a diagram illustrating a state in which a grout material is filled and hardened in a second recess in the positional relationship between the joining member and the threaded flange illustrated in FIG. 9.

  Hereinafter, a precast concrete foundation block and a joint structure thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the specification and the drawings, substantially the same components are denoted by the same reference numerals, and redundant description may be omitted.

[Precast concrete foundation block according to embodiment]
First, a precast concrete foundation block according to an embodiment will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is a longitudinal sectional view of an example of the precast concrete foundation block according to the embodiment, and FIG. 2 is a sectional view taken along the line II-II of FIG. is there.

  The illustrated precast concrete foundation block 10 is a precast foundation block that forms a rising portion of the foundation, and is manufactured at a factory and transported on site to form a foundation such as a cloth foundation. As shown in FIG. 1, a precast concrete foundation block 10 connects an upper end bar 11 and a lower end bar 12 extending in the L direction, which is the direction in which the foundation extends, and connects the upper end bar 11 and the lower end bar 12 in the vertical direction and in the L direction. It has a plurality of vertical streaks 13 (stirrups) arranged at a predetermined pitch, and horizontal streaks 14 (abdominal muscles) between the upper end streaks 11 and the lower end streaks 12 and extending in the L direction. The upper end bar 11, the horizontal bar 14, and a part of the vertical bar 13 are buried in the precast concrete 15, and the lower bar 12 buried in the concrete for footing cast on site is exposed to the outside to constitute the whole. Have been.

  As shown in FIG. 2, the upper end bar 11, the lower end bar 12, the vertical bar 13, and the like are arranged substantially at the center of a cross section (a cross section in a direction orthogonal to the longitudinal direction) of the precast concrete foundation block 10. Although illustration of the left side of the precast concrete 15 is omitted in FIG. 1, the configuration of the left end of the precast concrete 15 has, for example, a configuration similar to the configuration of the right end illustrated.

  A first concave portion 17 (cotter) having a rectangular parallelepiped shape is provided at a position corresponding to the upper end streaks 11 in the end portion 16 of the precast concrete foundation block 10 in the extending direction. At the end 16, a plurality (three in the illustrated example) of trapezoidal column-shaped third recesses 18 are provided at intervals below the first recesses 17, and the first recess 17 and each of the third recesses 18 are provided. The three concave portions 18 are communicated with each other by a communication groove (not shown) formed in the end portion 16 so that the grout material filled in the first concave portion 17 flows into each third concave portion 18 through the communication groove in order. It has become.

  In the precast concrete 15, a joint main reinforcement 20 lapping the upper joint 11 with the lap joint length t <b> 1 is further embedded, and the end of the upper reinforcement 11 and the end of the joint main reinforcement 20 are in the first recess 17. It is protruding.

  A thread groove 21 is provided at one end of the joint main bar 20 protruding from the first recess 17, and a threaded flange 30 is screwed into the thread groove 21. An example of the threaded flange 30 is a nut having high dimensional accuracy.

  A plurality of precast concrete foundation blocks 10 manufactured at a factory are conveyed on site and arranged in the direction in which the foundation extends along the outer wall of the building, thereby forming, for example, a rising portion of a cloth foundation.

[Joint structure of precast concrete foundation block according to embodiment]
Next, a joint structure of the precast concrete foundation block according to the embodiment will be described with reference to FIGS. Here, FIG. 3 is a longitudinal sectional view showing an example of the joint structure of the precast concrete foundation block according to the embodiment, and is a diagram showing both the precast concrete foundation and the cloth foundation formed by the on-site construction foundation. FIG. 4 is a view taken along the line IV-IV in FIG. 3, and FIG. 5 is a view taken along the line VV in FIG.

  As shown in FIGS. 3 and 4, by bringing the ends 16 of the precast concrete foundation blocks 10 connected to each other into contact with each other, both the first recesses 17 are continuous to form the second recess 40. Similarly, a plurality of fourth concave portions 50 are formed by connecting the third concave portions 18 of both.

  In the second concave portion 40, the ends of the two joint main bars 20 having the screw grooves 21 protrude, and the threaded flanges 30 are screwed into the respective screw grooves 21. The two right and left threaded flanges 30 are positioned in a joining member 70 having a hollow, and grout such as non-shrinkable mortar is inserted into the second recess 40 so as to embed the joining member 70 and the threaded flange 30. The material 80 has been filled and hardened. The grout material 80 filled in the second recess 40 flows into the plurality of fourth recesses 50 below the second recess 40 sequentially and hardens, so that almost the entire surface of the end portion 16 of the two precast concrete foundation blocks. The joining is performed via the grout material 80 to form the joining structure 100 of the precast concrete foundation block.

  At the construction site, a plurality of precast concrete foundation blocks are joined via the joining structure 100 along the extending direction of the foundation to form a rising portion of the fabric foundation. Then, after arranging the joint main reinforcement 60 lapping the overlap joint length to both lower reinforcements 12 of the adjacent precast concrete foundation block 10, concrete for footing shown by the two-dot chain line in FIGS. The lower end 12 and the joint main reinforcement 60 are cast at the site so as to be involved. Through this series of construction, the cloth foundation 200 is formed, in which the rising portion formed by the plurality of precast concrete foundation blocks 10 and the footing 90 by field construction are integrated.

  Next, an example of the joining member will be described with reference to FIG. Here, FIG. 6 is a perspective view of an example of the joining member, and illustrates a situation in which the end of the main joint bar is inserted into the hollow of the joining member, and the threaded flange is inserted through the opening into the hollow. FIG.

  The joining member 70 has a substantially cylindrical main body 71 made of metal or hard resin, and a hollow 72 is provided at the center of the main body. At both ends of the main body 71, insertion holes 75 through which the ends of the joint main reinforcement 20 are inserted are opened (only one of the insertion holes 75 is shown in FIG. 6), and each of the insertion holes 75 communicates with the hollow 72. ing. Further, a pair of openings 73 are formed at upper and lower positions on the side surface of the main body 71, and the openings 73 also communicate with the hollow 72. The opening 73 inserts the threaded flange 30 gripped by the operator's finger into the hollow 72, and rotates the threaded flange 30 relative to the thread groove 21 of the joint main bar 20 projecting into the hollow 72. And has an area that allows the position to be adjusted. That is, the opening 73 has a function of an insertion port for inserting the threaded flange 30 into the hollow 72 and also has a function of an adjustment port for adjusting the position of the threaded flange 30. In the main body 71, an insertion hole 75 faces a pair of inner wall surfaces 74 facing the hollow 72.

  As shown in FIG. 6, after the end of the joint main reinforcement 20 is inserted into the insertion hole 75 in the X1 direction to project the screw groove 21 into the hollow 72, the threaded flange 30 is inserted through the opening 73 into the hollow 72. And the screwed flange 30 is screwed into the screw groove 21, and the screwed flange 30 is moved to a desired position. Thus, the threaded flange 30 is set at a desired position.

  Although not shown, before the two precast concrete foundation blocks 10 in FIGS. 3 and 4 are joined, for example, in the first concave portion 17 of the left precast concrete foundation block 10, the joining is performed by the above-described procedure. Temporary installation of the left joint main reinforcement 20 and the threaded flange 30 with respect to the member is achieved.

  Next, as shown in FIG. 3 and FIG. 4, by contacting the right precast concrete foundation block 10 with the left precast concrete foundation block 10, the two first recesses 17 are continuously formed to form the second recess 40. . In the second concave portion 40, the joining member 70 on which the left joint main reinforcement 20 and the threaded flange 30 are temporarily installed is moved to the left, and the right precast concrete foundation is passed through the other through hole 75 of the joining member 70. The end of the joint main bar 20 of the block 10 is inserted into the hollow 72. Then, the threaded flange 30 is inserted into the hollow 72 of the joining member 70 through the opening 73 in the same manner as the method shown in FIG. By screwing the threaded flange 30, the temporary installation of the right joint main reinforcement 20 and the threaded flange 30 with respect to the joining member 70 is achieved.

  After provisional installation of the left and right joint main bars 20 and the threaded flange 30 with respect to the joining member 70 has been achieved, the joining member 70 is positioned, for example, near the center position of the second recess 40, and in the hollow 72 of the joining member 70, The position of the left and right threaded flanges 30 can be adjusted by rotating and moving the threaded flanges 30 relative to the left and right joint main bars 20 again.

  Next, an example of a positional relationship between the inner wall surface 74 of the hollow 72 of the joining member 70 and the threaded flange 30 will be described with reference to FIGS. Here, FIG. 7 is a diagram illustrating the positional adjustment of the threaded flange inside the hollow of the joining member and showing an example of the positional relationship between the hollow inner wall surface of the joining member and the threaded flange. FIG. 8 is a diagram illustrating a state in which the grout material is filled and hardened in the second concave portion in the positional relationship between the joining member and the threaded flange illustrated in FIG. 7. 9 and 10 correspond to FIGS. 7 and 8, respectively, and show another example of the positional relationship.

  As shown in FIG. 7, screw grooves 21 at the ends of the joint main reinforcement 20 protrude from the left and right into the hollow 72 of the joint member 70 provided in the second recess 40. On the other hand, by moving the threaded flange 30 in the X3 direction while rotating the threaded flange 30 with a finger or the like, the threaded flange 30 can be positioned at a desired position with respect to the joining member 70.

  In the example shown in FIG. 7, the inner wall surface 74 facing the hollow 72 and the threaded flange 30 are in close contact with each other. After the inner wall surface 74 and the threaded flange 30 are brought into close contact with each other, the connection structure 100 is formed by filling and curing the grout material 80 in the second concave portion 40 as shown in FIG.

  FIG. 8 simulates a case in which a tensile force N (or an axial force N) acts from the upper end bar 11 of the left precast concrete foundation block 10 via the joint main bar 20. The tensile force N acting on the left joint main bar 20 is distributed via the threaded flange 30 to the joining member 70 in which the threaded flange 30 is in close contact with the inner wall surface 74 and transmitted to the plurality of component forces N1. After that, each component N1 is transmitted to the right threaded flange 30 which is in close contact with the right inner wall surface 74 via the joining member 70. Then, the tensile force N, which is the resultant force of the component forces N1, is transmitted to the right joint main reinforcement 20, and is transmitted to the upper end reinforcement 11 of the right precast concrete foundation block 10. Since the inner wall surface 74 of the joining member 70 and the threaded flange 30 are in close contact with each other, effective transmission of the tensile force N between the adjacent precast concrete foundation blocks 10 is realized.

  On the other hand, in the example shown in FIG. 9, the threaded flange 30 is moved in the X3 direction while rotating the threaded flange 30 with a finger or the like, so that the gap between the inner wall surface 74 of the joining member 70 and the threaded flange 30 is increased. In this embodiment, a gap G having a predetermined width t2 is formed. The predetermined width t2 is about 1 mm to several mm, and is a width that can be filled with the grout material.

  After positioning the threaded flange 30 so as to have a gap G with a predetermined width t2 between the inner wall surface 74 and the threaded flange 30 in this manner, as shown in FIG. The connection structure 100 is formed by filling and curing the grout material 80.

  In the connection structure 100 shown in FIG. 10, the grout material 80 sufficiently enters the gap G and is hardened. 8, when a tensile force N is applied from the right side, a plurality of tensile forces N are applied to the joining member 70 from the threaded flange 30 via the hardened grout material 80 interposed in the gap G. Is distributed to the component force N1 and transmitted. After that, each component N1 is transmitted to the right threaded flange 30 via the hardened grout material 80 similarly interposed in the gap G via the joining member 70, and the resultant force of each component N1 is applied. A certain tensile force N is transmitted to the right joint main reinforcement 20.

  As described above, in any of the joining structures 100 of FIGS. 8 and 10, the axial force acting on the upper end reinforcement 11 of one adjacent precast concrete foundation block 10 is applied to the upper end reinforcement of the other precast concrete foundation block 10. The plurality of precast concrete foundation blocks 10 that can be effectively transmitted to the connection structure 100 and are integrated with the connection structure 100 can resist an external force that acts.

  It should be noted that other embodiments in which other components are combined with the configuration and the like described in the above embodiment may be adopted, and the present invention is not limited to the configuration shown here. This can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form.

  For example, in the joining member 70 in the illustrated example, the end of the joint main reinforcement 20 is inserted into the hollow 72 through the pair of insertion holes 75, and the threaded flange 30 is inserted into the hollow 72 through the opening 73. Although it is a form to be screwed into the screw groove 21, a joining member of other forms may be used. For example, the joining member has a fitting opening continuous with the hollow below the main body, and by dropping the joining member from above, the ends of the left and right joint main bars 20 and their screw grooves 21 are inserted through the fitting opening. The threaded flange 30 screwed into the opening may be fitted into the opening at one time.

  10: Precast concrete foundation block, 11: Top bar, 12: Lower bar, 13: Longitudinal bar (stirrup), 14: Transverse bar (abdominal bar), 15: Precast concrete (concrete), 17: First recess, 18: No. Three recesses, 20: joint main bar, 21: screw groove, 30: threaded flange (nut), 40: second concave, 50: fourth concave, 60: joint main bar, 70: joining member, 71: main body, 72 : Hollow: 73: opening, 74: hollow inner wall surface (inner wall surface), 75: insertion hole, 80: grout material, 90: footing, 100: joining structure (joining structure) of precast concrete foundation block, 200: cloth foundation

Claims (5)

A precast concrete foundation block forming a rising part of the foundation,
An upper reinforcement and a lower reinforcement extending in the extending direction of the foundation, and a vertical reinforcement connecting the upper reinforcement and the lower reinforcement in a vertical direction, wherein the upper reinforcement and a part of the vertical reinforcement are embedded in concrete. And
Of the end portions of the precast concrete foundation block in the extending direction, a first recess is provided at a position corresponding to the upper end bar,
In the concrete, one end of the joint main bar that overlaps the upper end bar and overlaps the joint length projects into the first recess,
A precast concrete base block, wherein a thread groove is provided at the one end of the joint main bar, and a threaded flange is screwed into the thread groove. The end portions of the precast concrete foundation block according to two claims 1 are in contact with each other, and the first concave portions are continuous with each other to form a second concave portion,
Ends of the joint main reinforcement extending from the left and right are inserted into the insertion holes of the hollow joint member having insertion holes at the left and right ends, and the threaded flange provided in the hollow is connected to the joint main reinforcement. A joint structure for a precast concrete base block, wherein the joint is screwed to the end and the hollow and the second recess are filled and hardened with a grout material.   The gap according to claim 2, wherein a gap is provided between the hollow inner wall surface of the joining member and the threaded flange, and the gap is filled and hardened with the grout material. Precast concrete foundation block joint structure.   The joint structure of a precast concrete foundation block according to claim 2, wherein the hollow inner wall surface of the joint member and the threaded flange are in close contact with each other. The joining member has an opening communicating with the hollow,
The opening is an insertion port for inserting the threaded flange into the hollow, and is used for adjusting the position of the threaded flange by screwing the threaded flange to an end of the joint main reinforcement. The joint structure for a precast concrete foundation block according to any one of claims 2 to 4, wherein the joint structure is an adjustment port for the precast concrete foundation block.

Images