Column base joint structure

Abstract

The objective is to fill the insertion holes formed on the upper surface of concrete members with filler material while suppressing the complexity of the reinforcement arrangement of concrete members. [Solution] The column base joint structure comprises a column from which a joint pin 40 protrudes from its lower end surface, a lower precast beam 70 having an insertion hole 74 into which the joint pin 40 is inserted, and a filling groove 75 on its upper surface that leads to the insertion hole 74, and a filling material M that fills the insertion hole 74, the filling groove 75, and the joint 62 between the column 30 and the lower precast beam 70.

Description

Technical Field

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[0001] The present invention relates to a column base joint structure.

Background Art

[0002] There is known a method of venting air in a recess formed in the lower end surface of the column main body of a precast concrete member to the outside of the column main body through a groove formed in the lower end surface and a sleeve joint embedded in the column main body (see, for example, Patent Documents 1 and 2).

[0003] Also, there is known a method of installing a wooden column by fitting a rigid convex portion protruding from the upper surface of the first foundation concrete into a recess formed in the lower end surface of the wooden column and joining them (see, for example, Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, it is conceivable to join a concrete beam and a column through a joining pin by filling a filler such as grout in a state where the joining pin protruding from the lower end surface of the column is inserted into an insertion hole formed in the upper surface of the concrete beam. In this case, for example, a filling hose leading to the insertion hole is embedded in the concrete beam, and the filler is filled into the insertion hole from the filling hose.

[0006] However, concrete members such as concrete beams have numerous reinforcing bars embedded within them. Therefore, embedding filling hoses in concrete members could complicate the reinforcement arrangement of the concrete members.

[0007] Considering the above facts, the present invention aims to fill insertion holes formed on the upper surface of concrete members with a filler material while suppressing the complexity of the reinforcement arrangement of concrete members. [Means for solving the problem]

[0008] The column base joint structure according to claim 1 comprises a column from which a joint pin protrudes from its lower end surface, a concrete member having an insertion hole into which the joint pin is inserted and a filling groove on its upper surface that leads to the insertion hole, and a filling material filled in the joint between the insertion hole, the filling groove, and the column and the concrete member.

[0009] According to the column base joint structure of claim 1, the concrete member has an insertion hole and a filling groove on its upper surface. A joining pin protruding from the lower end surface of the column is inserted into the insertion hole. The filling groove is connected to the insertion hole. A filler material is filled into these insertion hole, filling groove, and the joint between the column and the concrete member. As a result, the column and the concrete member are joined via the joining pin.

[0010] Here, as mentioned above, the concrete member has a filling groove on its upper surface that leads to the insertion hole. This allows the filling material to be filled into the insertion hole via the filling groove without embedding a filling hose in the concrete member.

[0011] Thus, the present invention makes it possible to fill the insertion holes formed on the upper surface of a concrete member with a filler material while suppressing the complexity of the reinforcement arrangement of the concrete member.

[0012] The column base joint structure according to claim 2 is the column base joint structure according to claim 1, wherein the filling groove is formed along the upper surface of the concrete member and reaches the outer surface of the column in a plan view.

[0013] According to the column base joint structure of claim 2, the filling groove is formed along the upper surface of the concrete member and reaches the outer surface of the column in a plan view. This allows the filling material to be filled into the insertion hole through the filling groove from the gap between the outer surface of the column and the filling groove. Therefore, workability is improved.

[0014] The column base joint structure according to claim 3 is the column base joint structure according to claim 1 or claim 2, further comprising a plurality of leveling bolts that protrude from the upper surface of the concrete member, support the column, and form the joint between the column and the concrete member.

[0015] According to the column base joint structure of claim 3, the multiple leveling bolts protrude from the upper surface of the concrete member, supporting the column and forming a joint between the column and the concrete member.

[0016] Here, the height and inclination of the column can be adjusted by increasing or decreasing the amount of protrusion of the leveling bolts that protrude from the upper surface of the concrete member. In addition, a joint can be easily formed between the column and the concrete member by using multiple leveling bolts. [Effects of the Invention]

[0017] As described above, according to the present invention, it is possible to fill the insertion holes formed on the upper surface of a concrete member with a filler material while suppressing the complexity of the reinforcement arrangement of the concrete member. [Brief explanation of the drawing]

[0018] [Figure 1] This is a longitudinal cross-sectional view showing a column and a lower precast beam to which a column base joint structure according to one embodiment is applied. [Figure 2] This is a cross-sectional view taken along line 2-2 in Figure 1. [Figure 3] This is a plan view showing the lower precast beam shown in Figure 1. [Figure 4]It is a longitudinal sectional view of a column and a lower precast beam showing the construction process of a column base joint structure according to an embodiment. [Figure 5] It is a longitudinal sectional view of a column and a lower precast beam showing the construction process of a column base joint structure according to an embodiment. [Figure 6] It is a longitudinal sectional view showing column test specimens and beam test specimens used for the filling test. [Figure 7] It is a plan view showing the beam test specimen shown in FIG. 1.

Mode for Carrying Out the Invention

[0019] Hereinafter, an embodiment will be described with reference to the drawings.

[0020] (Column) FIG. 1 shows a column 30 and a lower precast beam 70 to which the column base joint structure according to the present embodiment is applied. The column (column member) 30 is, as an example, a wooden column (wooden column). This column 30 is formed in a prismatic shape and has four side surfaces 30S. The lower precast beam 70 is an example of a concrete member.

[0021] (Fireproof board) A fireproof board 36 is attached to each side surface 30S of the column 30. The fireproof board 36 is, for example, a gypsum board, a calcium silicate board, etc., and is attached to each side surface 30S of the column 30 by an adhesive, screws, etc.

[0022] The fireproof boards 36 are attached to each side surface 30S of the column 30 in a state of being laminated in a plurality of layers (in this embodiment, three layers). The column 30 is fireproof-coated by these fireproof boards 36. The fireproof board 36 may be attached to the column 30 as needed and can be omitted as appropriate.

[0023] (Joint pin) A connecting pin 40 is provided at the lower end (base) of the column 30 to connect with the lower precast beam 70. Specifically, a mounting hole 32 is formed in the center of both end faces of the column 30 into which one end (upper end) of the connecting pin 40 is inserted. The mounting hole 32 is a circular, bottomed hole. In addition, a cover plate 46 is provided on the lower end face of the column 30.

[0024] The cover plate (sealing plate) 46 is made of steel plate or the like. This cover plate 46 is superimposed on the lower end surface of the column 30 and covers the entire lower end surface.

[0025] A through hole is formed in the center of the cover plate 46, leading to the mounting hole 32. One end of the connecting pin 40 is inserted through this through hole in the cover plate 46 into the mounting hole 32 formed in the end face of the column 30.

[0026] The cover plate 46 may be provided as needed and can be omitted as appropriate.

[0027] The connecting pin 40 is formed in a rod shape, for example, from a round steel bar. A pair of pin holes 42 are formed at one end of the connecting pin 40. The pair of pin holes 42 are circular through holes that penetrate the connecting pin 40 in the width direction (radial direction).

[0028] Furthermore, as shown in Figure 2, the pair of pin holes 42 intersect (are perpendicular to) each other when viewed from the axial direction of the connecting pin 40, and are offset in the axial direction of the connecting pin 40. A pair of fixing pins 44 are inserted into this pair of pin holes 42.

[0029] The pair of fixing pins 44 are formed from rod-shaped members such as drift pins. The pair of fixing pins 44 are inserted into a pair of pin holes 42 formed in the connecting pin 40, and also into a pair of pin holes 34 formed in the side surface 30S of the column 30.

[0030] The pair of pin holes 34 are circular through-holes that penetrate the column 30 and the mounting hole 32 in the width direction. In plan view, the pair of pin holes 34 intersect (are perpendicular to each other) and are offset in the direction of the column 30's material axis. The connecting pin 40 is fixed to the column 30 by inserting the fixing pin 44 into the mutually connecting pin holes 34 and 42.

[0031] The pair of fixing pins 44 are covered by the fire-resistant board 36. Furthermore, the connecting pins 40 are not limited to the pair of fixing pins 44; they may also be fixed to the column 30 by other fixing methods, such as adhesive.

[0032] The other end of the connecting pin 40 protrudes from the cover plate 46 that covers the lower end surface of the column 30. A male thread is also formed on the other end of the connecting pin 40. This other end of the connecting pin 40 is inserted into the insertion hole 74 of the lower precast beam 70, which will be described later.

[0033] The male thread on the other end of the connecting pin 40 may be provided as needed, but can be omitted as appropriate.

[0034] (Lower precast beam) As shown in Figure 1, the lower end (column base) of the column 30 is connected to the lower precast beam 70 via a connecting pin 40 (pin connection). The lower precast beam 70 is made of precast concrete and is manufactured, for example, in a factory or site yard. The lower precast beam 70 is made of reinforced concrete and has multiple main beam reinforcements 76 and shear reinforcements 78 embedded inside.

[0035] The lower precast beam 70 is a through beam. This lower precast beam 70 has a joint portion 72 that connects to the column 30 and a beam portion that extends from the joint portion 72. An insertion hole 74 is formed in the center of the upper surface of the joint portion 72.

[0036] The insertion hole 74 is a circular, bottomed hole. The insertion hole 74 is formed, for example, by embedding a sleeve in the joint portion 72. With the other end (lower end) of the connecting pin 40 inserted into this insertion hole 74, a filler material (cement-based filler) M such as mortar or grout is filled in.

[0037] Multiple leveling bolts 60 are provided around the insertion hole 74 on the upper surface of the joint portion 72. The multiple leveling bolts 60 protrude from the upper surface of the joint portion 72. By placing the lower end surface of the column 30 on these leveling bolts 60 via a cover plate 46, a joint 62 is formed between the upper surface of the joint portion 72 and the lower end surface of the column 30 (cover plate 46). This joint 62 is filled with a filler material M.

[0038] Furthermore, the joint portion 72 of the lower precast beam 70 may be joined to, for example, a column from the lower floor.

[0039] (filling groove) A filling groove 75 is formed on the upper surface of the joint portion 72. The filling groove 75 is formed in a rectangular cross-section and opens to the upper surface of the joint portion 72. The width of this filling groove 75 is narrower than the diameter of the insertion hole 74. Furthermore, the depth of the filling groove 75 is set so that it does not reach the upper end of the shear reinforcement bar 78 when viewed in cross-section of the lower precast beam 70.

[0040] As shown in Figure 3, the filling groove 75 extends from the insertion hole 74 and reaches the side surface 70S of the lower precast beam 70. In plan view, the filling groove 75 is positioned approximately perpendicular to the side surface 70S of the lower precast beam 70, connecting the insertion hole 74 and the side surface 70S of the lower precast beam 70 by the shortest distance.

[0041] Furthermore, the filling groove 75 reaches the outer surface of the column 30, i.e., the outer surface 36S of the fire-resistant board 36, in a plan view. In this embodiment, the outer surface 36S of the column 30 and the side surface 70S of the lower precast beam 70 are substantially flush. Also, if there is no fire-resistant board 36, the side surface 30S of the column 30 becomes the outer surface of the column 30.

[0042] (Construction method for column base connection structure) Next, an example of a construction method for the column base joint structure according to this embodiment will be described.

[0043] Figure 4 shows the lower precast beam 70 in place. Multiple leveling bolts 60 are pre-attached to the upper surface of the joint portion 72 of the lower precast beam 70.

[0044] (Pillar installation process) From this state, as shown in Figure 5, first, in the column installation process, the column 30 is installed on a plurality of leveling bolts 60 protruding from the upper surface of the joint portion 72. Specifically, as shown in Figure 4, the column 30 is lifted by a lifting machine (not shown) or the like, and the lower end surface of the column 30 is placed on the plurality of leveling bolts 60 via a cover plate 46.

[0045] At this time, the connecting pin 40 protruding from the cover plate 46 covering the lower end surface of the column 30 is inserted into the insertion hole 74. In addition, if necessary, the amount of protrusion of the multiple level adjustment bolts 60 protruding from the upper surface of the joint portion 72 is increased or decreased to adjust the level of the column 30.

[0046] The connecting pin 40 is fixed to the lower end of the column 30 by a pair of fixing pins 44 before the column 30 is installed. In this embodiment, the fire-resistant board 36 is pre-attached to the column 30 before it is installed.

[0047] (filling process) Next, as shown in Figure 1, in the filling process, the outer periphery of the joint 62 between the upper surface of the joint portion 72 and the lower end surface of the column 30 is sealed with formwork (not shown). In this state, the filler material M is filled into the insertion hole 74 through the filling groove 75 from the gap between the outer surface 36S of the column 30 and the side surface 70S of the lower precast beam 70, and the filler material M is also filled into the joint 62 between the upper surface of the joint portion 72 and the lower end surface of the column 30.

[0048] In this process, for example, the filler material M is injected into the filling groove 75 via a filling hose (not shown). The filling material M is also discharged from a discharge hole (not shown) formed on the outer circumference of the joint 62 to confirm that the filling material M has filled the insertion hole 74 and the joint 62.

[0049] (effect) Next, the effects of this embodiment will be described.

[0050] As shown in Figure 1, according to the column base joint structure of this embodiment, the joint portion 72 of the lower precast beam 70 has an insertion hole 74 and a filling groove 75 on its upper surface.

[0051] A connecting pin 40, which protrudes from the lower end surface of the column 30, is inserted into the insertion hole 74. The filling groove 75 also connects to the insertion hole 74. Filling material M is filled into these insertion hole 74, the filling groove 75, and the joint 62 between the column 30 and the lower precast beam 70. As a result, the column 30 and the lower precast beam 70 are joined via the connecting pin 40.

[0052] Here, as mentioned above, the joint portion 72 of the lower precast beam 70 has a filling groove 75 on its upper surface that leads to the insertion hole 74. As a result, in this embodiment, the filling material M can be filled into the insertion hole 74 via the filling groove 75 without embedding a filling hose in the joint portion 72 of the lower precast beam 70.

[0053] Thus, in this embodiment, the complexity of the reinforcement arrangement of the joint portion 72 in the lower precast beam 70 can be suppressed while filling the insertion hole 74 formed on the upper surface of the joint portion 72 with filler material M.

[0054] Furthermore, the filling groove 75 is formed along the upper surface of the joint portion 72 of the lower precast beam 70, reaching the side surface 70S of the lower precast beam 70, and in plan view, reaching the outer surface 36S of the column 30. As a result, the filler material M can be filled into the insertion hole 74 through the filling groove 75 from the gap between the side surface 70S of the lower precast beam 70 and the outer surface 36S of the column 30. Therefore, workability is improved.

[0055] Furthermore, multiple leveling bolts 60 are provided on the upper surface of the joint portion 72 of the lower precast beam 70. The multiple leveling bolts 60 protrude from the upper surface of the lower precast beam 70, supporting the cover plate 46 that covers the lower end surface of the column 30, and forming a joint 62 between the column 30 and the lower precast beam 70.

[0056] As mentioned above, the height and inclination of the column 30 can be adjusted by increasing or decreasing the amount of protrusion of the level adjustment bolt 60 that protrudes from the upper surface of the lower precast beam 70. In addition, a joint 62 can be easily formed between the column 30 and the lower precast beam 70 by using multiple level adjustment bolts 60.

[0057] Furthermore, in this embodiment, a cover plate 46 is provided on the lower end surface of the column 30. By placing the lower end surface of the column 30 on top of the multiple level adjustment bolts 60 via this cover plate 46, it is possible to suppress the multiple level adjustment bolts 60 from sinking into the lower end surface of the column 30.

[0058] (Filling test) In this filling test, the filling material M was filled into the insertion holes 74 formed in the beam test specimen 110 of the lower precast beam 70 via filling grooves 75, and the condition of the filling material M in the insertion holes 74 was verified.

[0059] (Test specimen) Figure 6 shows a beam test specimen 110 of the lower precast beam 70 and a column test specimen 100 of the column 30. In the beam test specimen 110, a joint section 114 made of concrete is placed on multiple bases 112. An insertion hole 118 is formed by embedding the upper part of an acrylic pipe 116 in this joint section 114.

[0060] The lower part of the acrylic pipe 116 protrudes downward from the joint portion 114 and is exposed between the adjacent bases 112. This acrylic pipe 116 is transparent, allowing the filling status of the filler material M into the lower end of the insertion hole 118 to be visually observed from the outside. Furthermore, as shown in Figures 6 and 7, a filling groove 120 leading to the insertion hole 118 is formed on the upper surface of the joint portion 114.

[0061] As shown in Figure 6, in the column test specimen 100, a connecting pin 104 is provided on an acrylic plate 102 that simulates the lower end surface of the column 30. The acrylic plate 102 is fixed to a plurality of mounting bolts 122 provided around the insertion hole 118 on the upper surface of the joint portion 114 by nuts 124, with a predetermined gap (joint 126) between it and the upper surface of the beam test specimen 110.

[0062] The acrylic plate 102 is transparent, allowing the filling status of the filler material M in the joint 126 between the acrylic plate 102 and the upper surface of the joint 114 to be visible from the outside. The outer periphery of the joint 126 between the acrylic plate 102 and the upper surface of the joint 114 is sealed by a formwork or the like (not shown).

[0063] The connecting pin 104 is made of a round bar, protrudes downward from the lower surface of the acrylic plate 102, and its lower end is inserted into the insertion hole 118 of the joint portion 114.

[0064] (Test results) In the beam test specimen 110 described above, the filling material was filled into the insertion hole 118 via the filling groove 120, and the condition of filling the lower end of the insertion hole 118 (acrylic pipe 116) and the condition of filling the joint 126 between the lower surface of the acrylic plate 102 and the upper surface of the joint portion 114 were visually confirmed.

[0065] As a result, after the filler material was completely filled into the lower end of the insertion hole 118, the filler material was also completely filled into the joint 126. Therefore, by confirming that the filler material was filled into the joint 126, it can be inferred that the filler material was also completely filled into the insertion hole 118.

[0066] (modified version) Next, a modified example of the above embodiment will be described.

[0067] In the above embodiment, the filling groove 75 reaches the side surface 70S of the lower precast beam 70. However, the length of the filling groove 75 can be changed as appropriate, and it does not have to reach the side surface 70S of the lower precast beam 70.

[0068] Similarly, in the above embodiment, the filling groove 75 reaches the outer surface of the column 30, i.e., the outer surface 36S of the fire-resistant board 36, in a plan view. However, the length of the filling groove 75 does not have to reach the outer surface 36S of the fire-resistant board 36 in a plan view.

[0069] Furthermore, in the above embodiment, the filling groove 75 is positioned substantially perpendicular to the side surface 70S of the lower precast beam 70 in a plan view. However, the filling groove 75 may be inclined with respect to the side surface 70S of the lower precast beam 70 in a plan view. Also, the cross-sectional shape and depth of the filling groove 75 can be changed as appropriate.

[0070] Furthermore, in the above embodiment, the outer surface 36S of the column 30 and the side surface 70S of the lower precast beam 70 are substantially flush. However, the outer surface 36S of the column 30 and the side surface 70S of the lower precast beam 70 are not limited to being substantially flush; there may be a step between the outer surface 36S of the column 30 and the side surface 70S of the lower precast beam 70.

[0071] Furthermore, in the above embodiment, multiple level adjustment bolts 60 are provided on the upper surface of the joint portion 72 of the lower precast beam 70. However, the upper surface of the joint portion 72 of the lower precast beam 70 may be provided with more than just multiple level adjustment bolts 60; for example, spacers that form a joint 62 may also be provided.

[0072] Furthermore, in the above embodiment, the concrete member is the lower precast beam 70. However, the concrete member is not limited to concrete beams such as the lower precast beam 70, but may also be a concrete beam such as a reinforced concrete beam formed by cast-in-place concrete.

[0073] Furthermore, the concrete members are not limited to concrete beams; they may also be concrete structural members such as slabs or concrete foundations.

[0074] Furthermore, in the above embodiment, the column 30 is made of wood. However, the column 30 is not limited to wood; for example, it may be made of reinforced concrete, steel-reinforced concrete, or steel.

[0075] Although one embodiment of the present invention has been described above, the present invention is not limited to these embodiments, and various modifications may be used in appropriate combinations with one embodiment, and it goes without saying that the invention can be implemented in various forms without departing from the spirit of the present invention. [Explanation of Symbols]

[0076] 30 pillars 36 Fire-resistant board 36S Exterior 40 connecting pins 60 Level adjustment bolt 62 Joint 70 Lower precast beam (concrete member) 74 Insertion holes 75 Filling groove

Claims

1. A column with a connecting pin protruding from its lower end surface, A concrete member having an insertion hole into which the connecting pin is inserted, and a filling groove leading to the insertion hole on its upper surface, The filling material is filled into the insertion hole, the filling groove, and the joint between the column and the concrete member. A column base joint structure equipped with this feature.

2. The filling groove is formed along the upper surface of the concrete member and, in plan view, reaches the outer surface of the column. The column base joint structure according to claim 1.

3. The concrete member is provided with a plurality of leveling bolts that protrude from the upper surface, support the column, and form the joint between the column and the concrete member. The column base joint structure according to claim 1 or claim 2.

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