Base plate and pedestal

Abstract

To provide a base plate and so on that excel in shear strength.SOLUTION: A base plate 3 has anchor bolt holes 7 as open holes arranged in the vicinity of the four corners. One end of a column 5 is connected to the top surface of the base plate 3. Each anchor bolt hole 7 has a cutout 9 that extends from the anchor bolt hole 7 to the side surface of the base plate 3. The cutout 9 allows mortar to flow in from the side, enabling the anchor bolt hole 7 to be securely filled with the mortar.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a base plate or the like to which a column is joined. [Background technology]

[0002] In the column-base structure of a structure, a base plate is joined to the bottom of the column, and the base plate is fixed to the concrete of the foundation, etc. with anchor bolts. At this time, mortar is filled between the base plate and the foundation.

[0003] In this way, when filling the gap between the base plate and the foundation with mortar, the mortar is also filled into the gap between the anchor bolt and the hole for inserting the anchor bolt. At this time, a method has been proposed for confirming that the mortar has been reliably filled into the anchor bolt hole (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-035313 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional methods, there are cases where the mortar does not fill the gap between the anchor bolt hole and the anchor bolt due to insufficient air escape or mortar flow area. Because the shear force on the base plate is transmitted to the anchor bolt via the mortar, if a gap occurs between the anchor bolt and the anchor bolt hole, the shear force is not transmitted to the anchor bolt. This causes a decrease in the shear strength of the column base structure.

[0006] The present invention has been made in view of the above problems, and has an object to provide a base plate or the like having excellent shear strength. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the first invention is a base plate to which a column is joined, characterized in that it has anchor bolt holes formed at predetermined positions in the base plate and cutout portions that continue from each of the anchor bolt holes to the side of the base plate.

[0008] The cutout portion may be a slit formed continuously from the lower surface side to the upper surface side of the base plate.

[0009] The cutout portion may be a groove formed to a predetermined depth from the upper surface side of the base plate.

[0010] The cutout portion may be a groove formed to a predetermined depth from the lower surface side of the base plate.

[0011] It is desirable that the width of the notch be smaller than the diameter of the anchor bolt hole.

[0012] The base plate may be substantially rectangular, the anchor bolt holes may be disposed near at least four corners of the base plate, and the cutout portions may be formed substantially parallel to diagonals of the base plate.

[0013] The base plate may be substantially rectangular, and the cutouts may be formed in a direction substantially perpendicular to adjacent sides of the base plate.

[0014] The width of the notch is preferably 2 mm or more.

[0015] According to the first aspect of the present invention, a cutout portion is provided that continues from the anchor bolt hole to the side surface of the base plate, so mortar can be introduced into the anchor bolt hole from the side surface of the base plate through the cutout portion. Therefore, mortar is not only filled into the gap between the anchor bolt hole and the anchor bolt from the underside of the base plate, but also can be filled into the anchor bolt hole through two routes, so mortar can be reliably filled between the anchor bolt and the anchor bolt hole. Therefore, shear force generated in the base plate can be reliably transmitted to the anchor bolt.

[0016] Furthermore, if the cutout portion is a slit formed continuously from the lower surface side to the upper surface side of the base plate, mortar can be introduced into the anchor bolt hole more efficiently.

[0017] Furthermore, if the cutout portion is a groove formed to a predetermined depth from the upper surface side of the base plate, a decrease in the strength of the base plate can be suppressed compared to a slit.

[0018] Furthermore, if the cutout portion is a groove formed to a predetermined depth from the underside of the base plate, it is possible to suppress a decrease in the strength of the base plate compared to a slit, and it is also possible to introduce mortar into the anchor bolt hole to the required height.

[0019] Furthermore, by making the width of the cutout smaller than the diameter of the anchor bolt hole, the shear force from the base plate can be efficiently transmitted to the anchor bolt.

[0020] Furthermore, when the base plate is approximately rectangular, by arranging the anchor bolt holes near at least the four corners of the base plate and forming the cutout portions approximately parallel to the diagonal lines of the base plate, the cutout portions can be arranged in areas of the base plate where stress is low, thereby suppressing a decrease in strength at the cutout portions.

[0021] Furthermore, when the base plate is approximately rectangular, the length of the cutout can be minimized by forming the cutout in a direction approximately perpendicular to each side of the adjacent base plate, thereby allowing mortar to be efficiently introduced into the anchor bolt hole from the side of the base plate.

[0022] Furthermore, by making the width of the cutout portion 2 mm or more, the mortar can be introduced more reliably into the anchor bolt hole.

[0023] The second invention is a column base structure using the base plate according to the first invention, characterized in that anchor bolts are inserted into the anchor bolt holes and fixed to the foundation, the anchor bolts are fixed with nuts on the upper surface of the base plate, mortar is filled between the base plate and the foundation, and the mortar is filled between the anchor bolt holes and the anchor bolts from the lower surface side of the base plate to a predetermined height.

[0024] It is desirable that the width of the notch is large relative to the minimum gap between the anchor bolt and the anchor bolt hole.

[0025] According to the second invention, mortar is filled between the anchor bolt holes and the anchor bolts from the underside of the base plate to a predetermined height, so that the shear force generated in the base plate can be reliably transmitted to the anchor bolts.

[0026] Furthermore, by making the width of the cutout portion wider than the smallest gap between the anchor bolt and the anchor bolt hole, mortar can be introduced more reliably between the anchor bolt and the anchor bolt hole. [Effects of the Invention]

[0027] According to the present invention, a base plate or the like having excellent shear strength can be provided. [Brief explanation of the drawings]

[0028] [Figure 1] (a) is a side view of the column member 1, and (b) is a cross-sectional view taken along line AA of (a). [Figure 2] Cross section along line BB in Figure 1(b). [Figure 3] 1(a) and 1(b) are diagrams showing the construction process of the column base structure 10. [Figure 4] 3(a) is an enlarged plan view of the vicinity of the anchor bolt hole 7 in FIG. 3(a), and FIG. 3(b) is an enlarged plan view of the vicinity of the anchor bolt hole 7 after filling with mortar. [Figure 5] 1(a) and 1(b) are diagrams showing a pillar member 1a, where FIG. 1(a) corresponds to FIG. 1(b), and FIG. 1(b) is a cross-sectional view taken along line FF in FIG. [Figure 6] 10(a) and 10(b) are diagrams showing the function of the notch portion 9a. [Figure 7] 1A and 1B are diagrams showing the form of a pillar member 1b, where (a) is a bottom view and (b) is a cross-sectional view taken along line HH of (a). [Figure 8] 10(a) and 10(b) are diagrams showing the function of the notch portion 9b. [Figure 9] 10(a) to 10(d) are diagrams showing other layouts of the cutout portion 9. FIG. [Figure 10] 10(a) to 10(d) are diagrams showing other layouts of the cutout portion 9. FIG. [Figure 11] 10(a) to 10(c) are diagrams showing other layouts of the cutout portion 9. FIG. [Figure 12] 10(a) to 10(e) are diagrams showing other layouts of the cutout portion 9. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] (First embodiment) Hereinafter, a pillar member 1 according to an embodiment of the present invention will be described. Fig. 1(a) is a side view showing the pillar member 1, and Fig. 1(b) is a cross-sectional view taken along line AA in Fig. 1(a). The pillar member 1 is mainly composed of a base plate 3 and a pillar 5.

[0030] The base plate 3 is a generally rectangular plate-like member made of, for example, steel in plan view. Anchor bolt holes 7, which are through holes, are provided near the four corners of the base plate 3. Anchor bolts, which will be described later, are inserted into the anchor bolt holes 7. One end of a pillar 5 is joined to the top surface of the base plate 3. The pillar 5 is, for example, a square steel pipe.

[0031] Fig. 2 is a cross-sectional view taken along line BB in Fig. 1(b). As shown in Fig. 2, each anchor bolt hole 7 is provided with a cutout 9 that continues from the anchor bolt hole 7 to the side surface of the base plate 3. In this embodiment, the cutout 9 is a slit that is formed to continue from the lower surface side to the upper surface side of the base plate 3. In other words, the anchor bolt hole 7 opens to the side surface of the base plate 3.

[0032] In this embodiment, the cutouts 9 are formed substantially parallel to the diagonal of the base plate 3. That is, the cutouts 9 are provided linearly from each anchor bolt hole 7 toward the nearby corner of the base plate 3. The areas of the base plate 3 near the corners outside the anchor bolt holes 7 are areas where stress from the columns 5 and the like is smallest, and therefore the reduction in strength due to the cutouts 9 can be minimized.

[0033] Next, we will explain the construction method of a column base structure using a column member 1 (base plate 3). First, as shown in Figure 3(a), the anchor bolt 11 is fixed to the foundation 14, and the column member 1 is installed from above, aligning it with the position of the anchor bolt 11. At this time, the anchor bolt 11 is inserted into the anchor bolt hole 7. After that, the anchor bolt 11 and the column member 1 are fixed together with a nut 13 and a washer 15.

[0034] Next, formwork 17 is installed at a predetermined distance from base plate 3 so as to surround the periphery of base plate 3. Note that base plate 3 is installed with a gap between it and foundation 14 using level mortar.

[0035] Fig. 4(a) is an enlarged plan view of the vicinity of the anchor bolt hole 7 in Fig. 3(a). The width D of the cutout portion 9 (the dimension perpendicular to the longitudinal direction of the cutout portion 9 connecting the anchor bolt hole 7 and the outer surface of the base plate 3) is desirably 2 mm or more. Furthermore, it is desirable that the width of the cutout portion 9 is wider than the minimum gap between the anchor bolt 11 and the anchor bolt hole 7 (the smallest gap between the anchor bolt 11 and the inner surface of the anchor bolt hole 7 over the entire circumference of the anchor bolt 11). Doing so ensures the filling of mortar, which will be described later.

[0036] Furthermore, the width D of the cutout 9 is preferably smaller than the diameter C of the anchor bolt hole, and is further preferably smaller than the diameter of the anchor bolt 11, and is even more preferably equal to or smaller than half the diameter of the anchor bolt hole 7. If the width of the cutout 9 is too wide, it becomes difficult for the shear force from the base plate 3, which will be described later, to be transmitted to the anchor bolt 11 via the mortar.

[0037] In this state, mortar is poured into the gap between the formwork 17 and the base plate 3. As shown in Fig. 3(b), mortar 19 is filled between the base plate 3 and the foundation 14, and also filled inside the anchor bolt hole 7 between the base plate 3 and the anchor bolt 11.

[0038] 4(b) is an enlarged plan view of the vicinity of the anchor bolt hole 7 when filled with mortar 19. As described above, when a predetermined amount of mortar 19 is filled from the gap between the formwork 17 and the base plate 3, the mortar 19 is filled from the underside of the base plate 3 into the gap between the anchor bolt hole 7 and the anchor bolt 11, and the cutout portion 9 becomes a flow path so that the mortar 19 flows into the anchor bolt hole 7 (arrow E in the figure).

[0039] For example, if the gap between the anchor bolt hole 7 and the anchor bolt 11 is small, there is a risk that mortar 19 will not flow into the anchor bolt hole 7 and a void will form, but the cutout portion 9 allows mortar 19 to flow in from the sides as well, making it possible to more reliably fill the anchor bolt hole 7 with mortar 19.

[0040] As shown in Figure 4(b), when mortar 19 is filled between the anchor bolt 11 and the inner surface of the anchor bolt hole 7 and around the entire circumference of the anchor bolt 11, the force from the base plate 3 can be transmitted to the anchor bolt 11. For example, when a shear force occurs in the base plate 3 in the horizontal direction, the force is transmitted from the base plate 3 to the anchor bolt 11 via the mortar 19, regardless of the direction. This makes it possible to increase the shear resistance.

[0041] As described above, according to this embodiment, the cutout portions 9 are provided between the anchor bolt holes 7 and the outer surface of the base plate 3, so that the anchor bolt holes 7 can be efficiently filled with mortar 19. As a result, the shear force from the base plate 3 can be reliably transmitted to the anchor bolts 11 from any direction, and the shear resistance can be increased.

[0042] When viewed from the anchor bolt 11, the base plate 3 does not exist in the direction where the cutout portion 9 is formed. For this reason, the shear force that the base plate 3 receives from the direction of the cutout portion 9 cannot be transmitted to the anchor bolt 11 at the location of the cutout portion 9. However, by narrowing the width of the cutout portion 9, at least a portion of the anchor bolt 11 (for example, a portion with a projected area of ​​1 / 2 or more) overlaps with the base plate 3 even against the shear force from the direction of the cutout portion 9, so that the stress from the base plate 3 can be transmitted to the anchor bolt 11.

[0043] (Second embodiment) Next, a second embodiment will be described. Figure 5(a) is a diagram (corresponding to Figure 1(b)) showing a pole member 1a according to the second embodiment, and Figure 5(b) is a cross-sectional view taken along line FF in Figure 5(a). In the following description, components that perform the same functions as those in the first embodiment will be assigned the same reference numerals as in Figures 1 to 4, and redundant description will be omitted.

[0044] The pillar member 1a has a configuration substantially similar to that of the pillar member 1, but differs in that a cutout portion 9a is formed instead of the cutout portion 9. The cutout portion 9a is not a slit but a groove formed to a predetermined depth from the upper surface side of the base plate 3. In other words, below the cutout portion 9a, no groove or slit is formed and the base plate 3 remains connected.

[0045] 6(a) is an enlarged cross-sectional view of the vicinity of the anchor bolt hole 7 in the early stage after filling with mortar 19. As described above, when a predetermined amount of mortar 19 is filled through the gap between the formwork 17 and the base plate 3, the mortar 19 is filled below the base plate 3. On the other hand, if the gap between the anchor bolt hole 7 and the anchor bolt 11 is small, it is difficult for the mortar 19 to fill the gap, and the liquid level between the formwork 17 and the base plate 3 becomes higher than the underside of the base plate 3.

[0046] From this state, if a predetermined amount of mortar 19 is further filled through the gap between the formwork 17 and the base plate 3, the liquid level of the mortar 19 will rise up to the cutout portion 9a, as shown in Figure 6(b), and the cutout portion 9a will become a flow path, allowing the mortar 19 to flow into the anchor bolt hole 7 (arrow G in the figure).

[0047] In this way, the cutout portion 9a allows the mortar 19 to flow in from the side as well, so that the mortar 19 can be filled into the anchor bolt hole 7 more reliably.

[0048] According to the second embodiment, it is possible to obtain the same effects as those of the first embodiment. Furthermore, since the cutout portion 9a is not a slit, it is possible to prevent the strength of the base plate 3 from decreasing.

[0049] Furthermore, because the mortar 19 can be seen from above, it can be confirmed that the mortar 19 has reliably flowed into the anchor bolt hole 7. Furthermore, because the cutout portion 9 is not a slit, the entire circumferential surface of the anchor bolt 11 faces the inner surface of the anchor bolt hole 7 with the mortar 19 interposed between them. Therefore, shear force from the base plate 3 from any direction can be reliably transmitted to the anchor bolt 11.

[0050] (Third embodiment) Next, a third embodiment will be described. Figure 7(a) is a bottom view showing a pillar member 1b according to the third embodiment, and Figure 7(b) is a cross-sectional view taken along line HH in Figure 7(a).

[0051] The pillar member 1b has a configuration substantially similar to that of the pillar member 1, but differs in that a cutout portion 9b is formed instead of the cutout portion 9. The cutout portion 9b is not a slit but a groove formed to a predetermined depth from the underside of the base plate 3. In other words, above the cutout portion 9b, no groove or slit is formed and the base plate 3 remains connected.

[0052] 8(a) is an enlarged cross-sectional view of the vicinity of the anchor bolt hole 7 in the early stage after filling with mortar 19. As described above, when a predetermined amount of mortar 19 is filled through the gap between the formwork 17 and the base plate 3, the mortar 19 is filled below the base plate 3.

[0053] From this state, if a predetermined amount of mortar 19 is further filled through the gap between the formwork 17 and the base plate 3, the cutout portion 9b becomes a flow path, and the mortar 19 flows into the anchor bolt hole 7 (arrow I in the figure), as shown in Figure 8(b).

[0054] In this way, the cutout portion 9b allows the mortar 19 to flow in from the side as well, so that the mortar 19 can be filled into the anchor bolt hole 7 more reliably.

[0055] It is desirable that the height of cutout portion 9b from the underside of base plate 3 is 15 mm or more. By making the height of cutout portion 9b 15 mm or more, mortar 19 can be filled up to the height of cutout portion 9b, and the mortar filling height in anchor bolt hole 7 can be made 15 mm or more. As described above, in this embodiment, even if mortar is not filled up to the entire thickness of base plate 3 around anchor bolt 11 inside anchor bolt hole 7, as long as it is filled to a predetermined height, it is sufficient to transmit shear force.

[0056] According to the third embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, since the cutout portions 9b are not slits, a decrease in the strength of the base plate 3 can be suppressed. Furthermore, by providing the cutout portions 9b at a predetermined height from the lower surface, the required filling height of the mortar 19 can be easily determined. In other words, even if the filling height of the mortar 19 is set lower than the thickness of the base plate 3, the required filling height can be determined.

[0057] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the above-described embodiments. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas described in the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0058] For example, although an example has been shown in which the cutout portions 9 and the like are formed from the anchor bolt hole 7 toward the corners of the base plate 3, this is not limiting. Fig. 9(a) shows an example in which cutout portions 9 are formed in four directions from the anchor bolt hole 7 toward each side of the base plate 3. Fig. 9(b) shows an example in which the cutout portions 9 are formed toward opposing sides. In the following explanation, the pillar 5 will not be shown. Also, although an example of the cutout portion 9 is shown, the same applies to the cutout portions 9a and 9b.

[0059] As shown in Figures 9(a) and 9(b), by providing the cutout portions 9 so that they are perpendicular to each side of the adjacent base plate 3, the length of the cutout portions 9 is shortened, and therefore the flow path length of the mortar 19 can be shortened. Note that, as shown in Figures 9(c) and 9(d), the cutout portions 9 may be provided obliquely from the anchor bolt hole 7 to each side. In this case, as shown in Figure 9(c), the cutout portions 9 may be formed in four directions toward each of the four sides, or as shown in Figure 9(d), the cutout portions 9 may be formed toward each of the opposing sides.

[0060] Furthermore, in each of the above-described embodiments, an example has been shown in which one anchor bolt hole 7 is formed near each corner of the base plate 3, but this is not limited to this. In the example shown in Fig. 10(a), two anchor bolt holes 7 are formed near each corner of the base plate 3. In other words, this is a case in which eight anchor bolt holes 7 are formed. In this case as well, the cutout portions 9 may be formed approximately parallel to the diagonal line.

[0061] 10(b) is an example in which a notch 9 is formed from each anchor bolt hole 7 toward the corner of the base plate 3. Although the length of the notch 9 is long, as mentioned above, by forming the notch 9 in a portion of the base plate 3 where stress is small, it is possible to suppress a decrease in strength.

[0062] 10(c), the cutouts 9 of adjacent anchor bolt holes 7 may be formed in opposite directions and obliquely on each side of the base plate 3 near each corner of the base plate 3. Also, as shown in FIG. 10(d), cutouts 9 may be provided perpendicular to each anchor bolt hole 7 on each side of the adjacent base plate 3.

[0063] 11(a), the cutout portions 9 of anchor bolt holes 7 that are close to each other near a corner of the base plate 3 may be parallel to each other, and the cutout portions 9 may be formed in two opposite directions from each anchor bolt hole 7 toward each of the opposing sides of the base plate 3. Similarly, as shown in FIG. 11(b), the cutout portions 9 of anchor bolt holes 7 that are close to each other near a corner of the base plate 3 may be parallel to each other, and the cutout portions 9 may be formed perpendicular to each of the four sides of the base plate 3.

[0064] 11(c), adjacent anchor bolt holes 7 near the corners of the base plate 3 may be connected by a notch 9, and further notches 9 may be provided from the notches 9 connecting the anchor bolt holes 7 toward the side surface of the base plate 3. In this way, the number of notches 9 opening on the side surface of the base plate 3 can be reduced.

[0065] 12(a), three anchor bolt holes 7 are formed near each corner of the base plate 3. That is, a total of 12 anchor bolt holes 7 are formed. In this case, of the three anchor bolt holes 7 at each corner, the central anchor bolt hole 7 has a notch 9 formed facing the corner direction of the base plate 3, and the remaining two anchor bolt holes 7 are formed perpendicular to each adjacent side of the base plate 3.

[0066] 12(b), notches 9 are formed toward the corners of the base plate 3 for three adjacent anchor bolt holes 7 near each corner of the base plate 3. In the example shown in FIG. 12(c), notches 9 are formed in the three anchor bolt holes 7 at each corner so that they are parallel to each other and in a direction parallel to the diagonal of the base plate 3.

[0067] In the example shown in Figure 12(d), of the three adjacent anchor bolt holes 7 near each corner of the base plate 3, the central anchor bolt hole 7 has a cutout portion 9 formed in it facing the corner direction of the base plate 3, and the remaining two anchor bolt holes 7 have cutout portions 9 formed in them that are perpendicular to the cutout portion 9 formed in the central anchor bolt hole 7 and face in opposite directions to each other.

[0068] 12(e), of the anchor bolt holes 7 adjacent to each other near the corner of the base plate 3, the central anchor bolt hole 7 may be connected to the other anchor bolt holes 7 by cutout portions 9, and the central anchor bolt hole 7 may also be provided with a cutout portion 9 facing the corner of the base plate 3. In this way, the number of cutout portions 9 opening on the side surface of the base plate 3 can be reduced. [Explanation of symbols]

[0069] 1, 1a, 1b……Column members 3...Base plate 5... Pillar 7...Anchor bolt hole 9, 9a, 9b...Notch 10……Column base structure 11...Anchor bolt 13...Nut 14……Fundamentals 15...Washer 17...Formwork 19...Mortar

Claims

1. A base plate to which the column is joined, An anchor bolt hole formed at a predetermined position of the base plate; a cutout portion that continues from each of the anchor bolt holes to a side surface of the base plate; A base plate comprising:

2. 2. The base plate according to claim 1, wherein the notch is a groove formed to a predetermined depth from the upper surface of the base plate.

3. 2. The base plate according to claim 1, wherein the notch is a groove formed to a predetermined depth from the lower surface of the base plate.

4. 2. The base plate according to claim 1, wherein the notch is a slit formed continuously from the lower surface side to the upper surface side of the base plate.

5. 2. The base plate according to claim 1, wherein the width of the notch is smaller than the diameter of the anchor bolt hole.

6. The base plate is generally rectangular, The anchor bolt holes are arranged near at least four corners of the base plate, 2. The base plate according to claim 1, wherein the notch is formed substantially parallel to a diagonal line of the base plate.

7. The base plate is generally rectangular, The base plate according to claim 1 , wherein the notches are formed in a direction substantially perpendicular to adjacent sides of the base plate.

8. 2. The base plate according to claim 1, wherein the width of the notch is 2 mm or more.

9. A column base structure using the base plate according to any one of claims 1 to 8, Anchor bolts are inserted into the anchor bolt holes and fixed to the foundation, and the anchor bolts are fixed with nuts on the upper surface of the base plate, A column base structure characterized in that mortar is filled between the base plate and the foundation, and the mortar is filled between the anchor bolt hole and the anchor bolt from the underside of the base plate to a predetermined height.

10. 10. The column base structure according to claim 9, wherein the width of the notch is greater than the minimum gap between the anchor bolt and the anchor bolt hole.

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