JP2012154105A - Connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of a base and a column, which is capable of suppressing costs of construction and has no part projected to the outside.SOLUTION: The connection structure includes: a plate 16 which is fixed to an upper surface of a foundation 31 and is for mounting a base 41; a support pipe 12 embedded in the base 41; a lag screw 22 screwed to a column 51 upright from the upper surface of the base 41; a stud bolt 11 passing through the support pipe 12 and the lag screw 22; and a nut 28 screwed to the upper end part of the stud bolt 11. The plate 16 is provided with a screw hole 18 to be screwed with the lower end part of the stud bolt 11, a window 54 for assembling the nut 28 is provided on the side face of the column 51, and the column 51 is drawn to the plate 16 by the stud bolt 11. For the structure, since parts other than the plate 16 can be embedded in the base 41 or the column 51, a brace or the like is freely attachable and a configuration is simple, costs of construction are suppressed.

Description

  The present invention relates to a connection structure for installing a pillar on a foundation laid on an upper surface of a foundation in a wooden building.

  There are various methods for constructing wooden buildings such as houses, but in Japan, the wooden frame construction method with a frame made of bars such as foundations, pillars and beams is widely used. In order to secure the strength of the building by this construction method, it is necessary to firmly connect the adjacent bars, and in recent years, various hardware is often incorporated so as to straddle the bars. A concrete foundation is placed under the shaft along the outer edge of the building, the interior partition, etc., and a foundation is laid on the upper surface, and a pillar is raised from the foundation. These foundations and pillars are important in securing the strength of the building, and are integrated with the foundation with hole-down hardware to prevent lifting during an earthquake.

  Examples of the prior art related to the present invention include the following patent documents. Document 1 discloses a method for joining a base and a pillar, in which a pipe-like drawing member is inserted into the side surface of the pillar, and a bolt is inserted near the end of the drawing member. The bolt is inserted from the bottom surface of the base, and a nut is screwed and tightened to the tip of the bolt, whereby the attracting member is attracted to the base and prevents the column from being lifted.

  Document 2 discloses a joint structure used for a corner of a building, etc., and uses a joint hardware for mounting a base or a beam gathered at the corner on a column or foundation. This joint hardware is an integrated shape of a wing that can be inserted into the end face of the foundation or beam and a pipe pin that can be inserted into the column, and the wing is fixed by a pin driven from the side of the foundation or the beam. . In addition to being fixed to the foundation by anchor bolts, the pipe pin is also fixed by a pin driven from the side of the column.

  Next, Document 3 discloses a frame structure that joins wood such as foundations, columns, and beams. This technique is based on the premise that hollow wood in which a hollow hole penetrating the inside of the wood is processed, and a connection socket is embedded in a joint portion between the woods so as to straddle both hollow holes. Further, a bolt integrated with the foundation is inserted into the hollow hole or the connection socket, and the upper end of the bolt protrudes from the beam, and a nut is screwed into this portion. When the nut is tightened, beams and columns are drawn to the foundation, completing the frame structure.

JP 2007-191905 A JP 2002-13199 A JP 2007-9417 A

  The installation of foundations and pillars is extremely important for ensuring the safety of buildings, and various technical developments including the above-mentioned patent documents are underway. As a result, if the design and construction are appropriate, the current building is sufficiently safe. However, the conventional hole-down hardware and the configuration such as Patent Document 1 require that bolts or the like be arranged on the side surfaces of the pillars, which may be an obstacle when attaching braces or the like to the connecting portion between the base and the pillars. In recent years, demands for reducing construction costs have become strict, and efforts are being made to reduce the parts used and simplify the processing of bar materials while ensuring safety.

  The present invention has been developed on the basis of such a situation, and an object thereof is to provide a connecting structure between a base and a pillar that can suppress the cost during construction and has no projecting portion.

  The invention according to claim 1 for solving the above-mentioned problems is a plate fixed to the upper surface of a foundation rising from the ground, a support pipe embedded in a base placed on the upper surface of the plate, and an upright from the upper surface of the base A lag screw screwed into a pillar to be fixed, a stud bolt penetrating the support pipe and the lag screw, and a nut screwed into an upper end portion of the stud bolt, and the plate has a lower end portion of the stud bolt A screw hole that is screwed to the plate is provided, the column can be drawn to the plate via the stud bolt, and a window for incorporating the nut is provided on a side surface of the column. It is a connected structure.

  The present invention relates to a connecting structure for installing a column on the upper surface of a foundation in a wooden frame construction method. The foundation is placed on the upper surface of a foundation with a plate interposed therebetween, and the lower surface of the column is in contact with the upper surface of the foundation. Assuming that. The foundation is made of concrete and rises like a wall from the ground, and extends along the outer edge of the building. Its width is slightly wider than the base and the upper surface is finished horizontally. The plate is a steel plate for securing a gap between the foundation and the base, and has a width equal to the width of the foundation. An anchor bolt protruding from the upper surface of the foundation can be inserted, and can be integrated with the foundation.

  The column is placed directly above the plate. However, a base is arranged between the plate and the column, and both do not come into contact with each other. Furthermore, in order to draw the pillar to the foundation, a lag screw is screwed into the lower surface of the pillar. The lag screw is in the shape of a round bar made of steel, and has an appearance that is a larger size of a wood screw, and the ridges protruding from the side peripheral surface extend in a spiral shape. By protruding the ridge into the pillar, the pillar and the lag screw are firmly integrated, and the deformation of the pillar can be suppressed by the ridge. In some cases, one lag screw is screwed into one column, but a plurality of screws are also screwed in depending on the cross-sectional shape of the column.

  The support pipe has a cylindrical shape made of steel, is arranged concentrically with the lag screw, and is inserted so as to penetrate the upper and lower surfaces of the base. It is assumed that the total length is substantially equal to the height of the base, the lower end surface is in contact with the plate, and the upper end surface is in contact with the lag screw. In order to insert the support pipe, a shaft hole is processed in advance in the base. Since the support pipe is in contact with the plate and the lag screw, the support pipe has a function of transmitting a downward load acting on the column to the plate, and can relieve stress generated on the column and the base.

  The stud bolt has a simple round bar shape and is formed with a screw on the entire side surface or only at both ends. In the present invention, the stud bolt is inserted so as to pass through the centers of the concentric lag screw and the support pipe. Therefore, the lag screw is hollow, and the support pipe has an inner diameter into which a stud bolt can be inserted. Note that the overall length of the stud bolt is slightly longer than the total length of the lag screw and the support pipe.

  The lower end portion of the stud bolt inserted so as to penetrate the center of the lag screw and the support pipe is screwed into the plate. Therefore, screw holes are provided in the plate at predetermined positions. A nut is screwed into the upper end of the stud bolt. The nut can be in contact with the upper end surface of the lag screw, and the lag screw and the support pipe can be brought into close contact with each other by tightening. The window is formed by hollowing out the side of the column for inserting and tightening the nut, and is provided at a position corresponding to the upper end of the screwed lag screw.

  After the lower end of the stud bolt is screwed into the screw hole on the plate, and the nut is screwed onto the upper end of the stud bolt and tightened, the nut and stud bolt begin to rotate together, and the bottom of the stud bolt The end face touches the foundation. Thereafter, the stud bolt becomes non-rotatable, and thereafter, the lag screw is pushed downward by the nut. Therefore, the lag screw and the support pipe are sandwiched between the plate and the nut, and the column is drawn to the foundation.

  The invention according to claim 2 is for preventing loosening of the stud bolt, and an inner screw capable of being screwed to the stud bolt is provided at the lower end portion of the inner peripheral surface of the support pipe. . In the invention described in claim 1, the stud bolt is installed on the base of the pillar, and the stud bolt should not be loosened over time. Therefore, some measures are required when the stud bolts are likely to loosen due to daily exposure to minute vibrations such as buildings along the main road.

  In the invention according to claim 2, the internal thread which is screwed into the stud bolt is provided on the inner peripheral surface of the support pipe. By screwing the inner screw into the stud bolt and tightening it, the support pipe can be brought into close contact with the plate, and when this reaction force is received by the stud bolt, the friction at the screwing point increases and loosening occurs. Can be suppressed.

  As in the first aspect of the invention, the support pipe is embedded in the base, the lag screw is screwed into the column, the plate is fixed to the upper surface of the foundation via the anchor bolt, and the column is fixed with the stud bolt that is screwed to the plate. By adopting a connection structure that draws to the foundation, all the parts except the plate can be embedded in the foundation or pillar, and no parts are arranged on the side of the pillar. Therefore, braces can be attached freely, and it is very convenient.

  Furthermore, plates, support pipes, lag screws, and stud bolts can be diverted from general-purpose products, and can be commercialized with minimal work such as length adjustment, and no steps such as welding are required. In construction, it can be handled only by general operations such as drilling holes in the base and pillars and screwing in the lag screw, and the cost during construction can be suppressed without difficulty.

  As described in the second aspect of the present invention, by providing an inner screw threadedly engaged with the stud bolt on the inner peripheral surface of the support pipe, a tensile load can be applied to the stud bolt by the plate and the support pipe. Due to this reaction force, the friction at the screwed portion between the stud bolt and the plate increases, and the looseness of the stud bolt can be suppressed even in an environment where minute vibrations are applied on a daily basis.

It is a perspective view which shows the specific example of the connection structure by this invention. It is a perspective view which shows the middle stage at the time of assembling the connection structure of FIG. It is the perspective view which shows the state which assembled the connection structure of FIG. 1, and its longitudinal cross-sectional view. It is a perspective view which shows the case where an internal screw is provided in the support pipe embedded in a base. It is a longitudinal cross-sectional view which shows the state which assembled the connection structure of FIG.

  FIG. 1 shows a specific example of a connecting structure according to the present invention. In this connection structure, a base 41 is placed on the upper surface of the foundation 31, and a column 51 is installed on the upper surface of the foundation 41, and the foundation 41 and the column 51 are fixed to the foundation 31 via the plate 16. The foundation 31 is made of concrete rising from the ground, extends along the outer edge of the building with a certain thickness, and its upper surface is finished horizontally. An anchor bolt 32 is embedded in a predetermined position inside the foundation 31, and a tip of the anchor bolt 32 projects from the upper surface of the foundation 31. The base 41 is laid horizontally along the upper surface of the foundation 31, and the pillars 51 and the like are installed on the base 41. Note that both the base 41 and the pillar 51 are made of wood containing laminated wood.

  The base 41 is not directly placed on the upper surface of the foundation 31, but the plate 16 is sandwiched between the two. The plate 16 is obtained by cutting a steel plate having a width substantially the same as that of the base 41. The plate 16 is arranged along the longitudinal direction of the foundation 31 and the base 41, and is further firmly integrated with the foundation 31 to prevent the building from being lifted. Take on. Therefore, round holes 17 for inserting anchor bolts 32 are provided at both ends of the plate 16, and are integrated with the foundation 31 by fixing nuts 34. In order to accommodate the anchor bolt 32 and the fixing nut 34, a relief hole 42 is processed on the lower surface of the base 41.

  The column 51 is connected to the plate 16 via the lag screw 22 and the stud bolt 11. The lag screw 22 is provided with spiral ridges 24 on the side peripheral surface of a steel round bar, and the ridges 24 bite into the columns 51, so that they are firmly integrated with the columns 51. There is no loosening due to the secular deformation of the column 51. In addition, the center of the lag screw 22 is provided with a through hole 23 penetrating both end faces, and the lower end portion of the lag screw 22 is finished in a hexagonal shape for applying a tool. Further, in order to screw the lag screw 22, a pilot hole 53 extending in the longitudinal direction is processed in advance starting from the lower end surface of the column 51. The inner diameter of the pilot hole 53 is substantially equal to the outer diameter of the lag screw 22 (excluding the ridge 24), and only the ridge 24 bites into the column 51. In addition, the cross section of the column 51 in the drawing is not square but has a large lateral width (longitudinal direction of the base 41). Therefore, a total of two lag screws 22 are arranged on the left and right.

  Since the base 41 receives a downward load acting on the column 51, the base 41 may be deformed so as to be crushed over time. In order to prevent this, the support pipe 12 is embedded in the base 41 at a position that is concentric with the lag screw 22. The support pipe 12 is a steel round pipe with a center hole 13 penetrating both ends. The lower end surface is brought into contact with the plate 16, and the upper end surface is brought into contact with the lag screw 22, so that a downward load acting on the column 51 is not transmitted to the base 41. In order to embed the support pipe 12, a shaft hole 43 penetrating the upper and lower surfaces is processed in the base 41 in advance.

  The stud bolt 11 is used to pull the column 51 toward the plate 16 and is inserted into the center hole 13 and the through hole 23 that are concentrically aligned. The plate 16 is provided with a screw hole 18 so that it can be screwed into the lower end portion of the stud bolt 11, and a nut 28 is screwed into the upper end portion of the stud bolt 11. A window 54 is processed on the side of the column 51 so that the nut 28 can be inserted and tightened. The window 54 crosses the pilot hole 53 and reaches the opposite surface.

  When the support pipe 12 is embedded in the base 41, the lag screw 22 is screwed into the pillar 51, the stud bolt 11 is inserted from the upper surface of the base 41 toward the screw hole 18, and then the pillar 51 is placed on the base 41, the stud bolt 11 The upper end portion passes through the through hole 23 and reaches the window 54. Thereafter, when the nut 28 is inserted from the window 54 and screwed into the stud bolt 11, the column 51 is drawn to the plate 16 and the installation is completed. A pin 29 is embedded in the boundary between the base 41 and the column 51 in order to receive the horizontal load acting on the column 51. The pin 29 is a steel rod and is embedded in pin holes 45 and 55 provided on the upper surface of the base 41 and the lower surface of the column 51.

  FIG. 2 shows an intermediate stage when the connecting structure of FIG. 1 is assembled. As shown in this figure, at the stage before the base 41 and the column 51 are connected, the support pipe 12 and the pin 29 are embedded in the base 41, and the lag screw 22 is screwed into the column 51. The plate 16 is mounted on the upper surface of the foundation 31 and is fixed to the foundation 31 by screwing a fixing nut 34 to the anchor bolt 32. Next, the base 41 is placed on the plate 16, the stud bolt 11 is further inserted into the support pipe 12, and the lower end portion is screwed into the screw hole 18. Thereafter, the suspended column 51 is gradually lowered, and the upper end portion of the stud bolt 11 is inserted into the lag screw 22. Then, after the lower surface of the column 51 comes into contact with the base 41, the nut 28 is inserted from the window 54, and this is screwed into the upper end portion of the stud bolt 11 and tightened.

  FIG. 3 shows a state where the connection structure of FIG. 1 is assembled. The column 51 is attracted to the plate 16 by the stud bolt 11, and the column 51 and the base 41 are integrated with the foundation 31 through the plate 16. The support pipe 12, the lag screw 22, and the stud bolt 11 are entirely embedded in the base 41 and the column 51, and the nut 28 is located inside the window 54, from the side of the base 41 and the column 51. There are no protruding parts. Therefore, there is a high degree of freedom when placing braces and the like.

  If the lower end surface of the stud bolt 11 contacts the foundation 31 as shown in the longitudinal sectional view, the stud bolt 11 cannot be screwed any further. Therefore, when the nut 28 screwed to the upper end portion of the stud bolt 11 is tightened, the stud bolt 11 does not rotate integrally. Further, the plate 16 is longer than the lateral width of the column 51 (left and right direction in the longitudinal sectional view), and can easily receive the load transmitted from the column 51 and the support pipe 12. In this figure, the boundary between the support pipe 12 and the lag screw 22 is made coincident with the boundary between the base 41 and the column 51, but the present invention is not limited to this configuration, and the lag screw 22 is viewed from the lower surface of the column 51. The support pipe 12 can be shortened by slightly projecting.

  The window 54 is processed so as to intersect with the upper end portion of the screwed lag screw 22, and a sufficient inner diameter is secured for inserting a tool for tightening the nut 28. In addition, one pin 29 is arranged at the boundary between the base 41 and the column 51 so that a horizontal load acting on the column 51 can be transmitted without difficulty. In order to accommodate the anchor bolt 32 and the fixing nut 34, a clearance hole 42 is provided on the lower surface of the base 41.

  FIG. 4 shows a case where the inner screw 15 is provided on the support pipe 12 embedded in the base 41. This figure has the same configuration as that of FIG. 1 except for the shape of the support pipe 12, and the column 51 is drawn to the plate 16 via the stud bolt 11. The support pipe 12 has a hexagonal shape at the top so that a tool can be hung, and an inner screw 15 that can be screwed with the stud bolt 11 is provided below the center hole 13.

  At the time of construction, first, the support pipe 12 is inserted into the shaft hole 43 of the base 41, and the base 41 is placed on the upper surface of the plate 16. Next, the stud bolt 11 is inserted from the center hole 13 toward the screw hole 18. Thereafter, the stud bolt 11 is rotated and its lower end is screwed into the inner screw 15 and the screw hole 18. When the screwing is continued and the lower end surface of the stud bolt 11 is brought into contact with the foundation 31, a tool is put on the upper portion of the support pipe 12 to rotate it, and the support pipe 12 and the plate 16 are brought into close contact by the inner screw 15. This reaction force generates a tensile load in the lower portion of the stud bolt 11 and increases the friction at the screwed portion, so that it is difficult for loosening to occur.

  FIG. 5 shows a state in which the connecting structure of FIG. 4 is assembled in a longitudinal section. An inner screw 15 is provided on the lower inner periphery of the support pipe 12, and this is screwed with the stud bolt 11. Therefore, at the lower part of the stud bolt 11, the section screwed with the screw hole 18 of the plate 16 and the section screwed with the inner screw 15 are attracted, and the plate 16 and the support pipe 12 are brought into close contact by the reaction force. To do. As a result, the friction at both screwing points increases, and loosening between the lower end portion of the stud bolt 11 and the plate 16 can be suppressed.

11 Stud bolt 12 Support pipe 13 Center hole 15 Inner screw 16 Plate 17 Round hole 18 Screw hole 22 Lag screw 23 Through hole 24 Projection 28 Nut 29 Pin 31 Foundation 32 Anchor bolt 34 Fixing nut 41 Base 42 Escape hole 43 Shaft hole 45 Pin hole 51 Pillar 53 Pilot hole 54 Window 55 Pin hole

Claims (2)

A plate (16) to be fixed to the upper surface of the foundation (31) rising from the ground;
A support pipe (12) embedded in a base (41) placed on the upper surface of the plate (16);
A lag screw (22) screwed into an upright column (51) from the upper surface of the base (41);
A stud bolt (11) passing through the support pipe (12) and the lag screw (22);
A nut (28) screwed into the upper end of the stud bolt (11);
With
The plate (16) is provided with a screw hole (18) screwed into a lower end portion of the stud bolt (11), and the column (51) is connected to the plate (16) via the stud bolt (11). ), And a window (54) for incorporating the nut (28) is provided on a side surface of the column (51). The connection structure according to claim 1, wherein an inner screw (15) capable of screwing with the stud bolt (11) is provided at a lower end portion of an inner peripheral surface of the support pipe (12).

Images