JP2010275709A - Method for reinforcing beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reinforcing a beam, which enables the proper reinforcement of the beam, enables low-cost construction, facilitates a load-reducing design on a building, and is excellent in practicality. <P>SOLUTION: The method for reinforcing the beam 1 of the existing building is as follows: fixing members 2 are provided in a fixed state in positions to right and left ends of the beam 1, respectively; a push-up member 4, which is provided via the right and left fixing members 2 and a connecting member 3, which supports the undersurface of the beam 1, and which has a jack member 6 and a jack retainer member 5, is mounted between the fixing members 2 at a position near the central portion of the beam 1; a movable end 7 of the jack member 6 is brought into motion and then stopped in a state in which a predetermined push-up force acts on the beam 1; a push-up body 8, which is provided on the push-up member 4 and protruded for contacting the undersurface of the beam 1 and pushing the surface up, is brought to be protruded until the movable end 7 and the beam 1 are separated from each other, so that the beam 1 can be supported by the push-up body 8; and subsequently, the jack member 6 is removed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a beam reinforcing method.

  Conventionally, for example, as disclosed in Patent Document 1, a method of reinforcing a beam by adding a reinforcing beam to a beam of an existing building has been proposed.

  However, a so-called member reinforcement design in which such a reinforcing beam is attached to reinforce the beam requires a large amount of construction and increases the cost accordingly. In addition, it is troublesome to examine how much strength (proof strength) is improved by reinforcement, and it is troublesome to carry out a load reduction design that reduces the load design of a building.

JP 2005-232678 A

  The present invention solves the above-described problems, and cancels the vertical load by constantly pushing up the central portion of the beam from below with a predetermined push-up force by the push-up member regardless of the member reinforcement (member reinforcement design) of the beam itself. Therefore, it is possible to reinforce the beam well, and this reinforcement is very easy and cost-effective, and because of such reinforcement, the load reduction design of the building can be easily carried out. An excellent beam reinforcement method is provided.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A method for reinforcing a beam 1 of an existing building, in which a fixing member 2 is provided in a fixed state at positions near the left and right ends of the beam 1, and a position near the center of the beam 1 between the fixing members 2 Further, a push-up member 4 provided via the right and left fixing members 2 and the connecting member 3 to support the lower surface of the beam 1 and having a jack member 6 and a jack receiving member 5 is provided, and a movable end 7 of the jack member 6 is provided. The movable end 7 stops moving in a state in which a predetermined push-up force is applied to the beam 1 and is pushed up so that the push-up member 4 protrudes and comes into contact with the lower surface of the beam 1 to push up the lower surface. A method for reinforcing a beam comprising: projecting a body 8 until the movable end 7 and the beam 1 are separated from each other and supporting the beam 1 by the push-up body 8; and then removing the jack member 6. It is.

  The beam reinforcing method according to claim 1, wherein the jack receiving member 5 is removed together with the jack member 6.

  The beam reinforcing method according to any one of claims 1 and 2, wherein the connecting member 3, the fixing member 2, and the push-up member 4 are pivotally attached to each other. This relates to the beam reinforcement method.

  Further, in the beam reinforcing method according to any one of claims 1 to 3, at least one jack member 6 is disposed at each of left and right positions of the push-up member 4 so as to sandwich the push-up member 4. The present invention relates to a method for reinforcing a beam.

  5. The beam reinforcing method according to claim 1, wherein the connecting member 3 is provided on each of the front and rear sides of the fixing member 2 and the push-up member 4. This relates to the reinforcing method.

  Since the present invention is as described above, it is a beam reinforcing method that can be applied very easily and at a low cost, and that can be easily designed to reduce the load of a building, and that has excellent practicality.

It is a schematic explanatory perspective view of a present Example. It is a disassembled general | schematic explanatory perspective view of the principal part of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is work process explanatory drawing of a present Example. It is a graph which shows the relationship between jack resultant force and diagonal material tensile force. It is a graph which shows the relationship between jack resultant force and diagonal material tensile force. It is a graph which shows the relationship between jack resultant force and diagonal material tensile force. It is a graph which shows the relationship between jack resultant force and diagonal material tensile force. It is a graph which shows the relationship between jack resultant force and diagonal material tensile force. It is a schematic explanatory drawing of a present Example. It is a schematic explanatory drawing of a present Example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  A push-up member 4 having a jack member 6 and a jack receiving member 5 is disposed on the beam 1, and the movable end 7 of the jack member 6 is moved so that a predetermined push-up force is applied to the beam 1.

  In a state where a predetermined push-up force is applied to the beam 1 by the jack member 6, the jack receiving member 5 receives a reaction force from the beam 1 and the push-up member 4 tends to be pushed down. However, since the push-up member 4 and the right and left fixing members 2 are connected by the connecting member 3, a tensile force (tensile force) is generated in the connecting member 3, and the push-up member 4 causes the beam 1 to move to the predetermined force. It is supported in a state where it is pushed up by the pushing-up force.

  Subsequently, the movement of the movable end 7 of the jack member 6 is stopped, the push-up body 8 is projected from the push-up member 4 until the movable end 7 is separated from the beam 1, and the beam 1 is supported by the push-up body 8.

  As a result, the push-up body 8 directly pushes up the lower surface of the beam 1 and the jack member 6 is loosened. By removing the jack member 6 (and the jack receiving member 5 as required), the construction is completed.

  Therefore, the jack member 6 is not required, and the vertical load applied to the beam 1 is always canceled by the pushing-up by a predetermined pushing force by the pushing-up member 4 (push-up body 8). (Yield strength) can be improved by a simple and inexpensive method.

  Further, by measuring the push-up force (pressurized load) by the jack member 6, the offset load on the beam 1 can be accurately grasped to some extent, and the load reduction design of the building is facilitated accordingly.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a method for reinforcing the beam 1 of an existing building, and is located near the center of the beam 1 between the fixing members 2 provided in a fixed state at positions near the left and right ends of the beam 1. A push-up member 4 which is provided via the right and left fixing members 2 and the connecting member 3 and is supported opposite to the lower surface of the beam 1, a jack receiving member 5 which is connected and fixed to the push-up member 4, and the jack A jack member 6 provided between the receiving member 5 and the lower surface of the beam 1 is disposed, and the movable end 7 of the jack member 6 is moved so that a predetermined push-up force is applied to the beam 1. The movable end 7 stops moving, and the push-up body 8 is projected from the push-up member 4 toward the lower surface of the beam 1 until the movable end 7 is separated from the beam 1, and the beam 1 is moved by the push-up body 8. The jack member 6 is removed after being supported.

  First, as illustrated in FIGS. 1 and 2, the fixing members 2 are fixed to the left and right end positions of the beam 1 (positions in the vicinity of the connecting portion with the rod 9 such as a column), respectively. The fixing member 2 is attached to both the front and rear side surfaces of the beam 1 and fixed to the metal plate material 11 and the beam 1 so as to pass through a substantially central position of the metal plate material 11 by being fixed by a metal anchor 10. It is composed of a metal fixing rod 13 (lot rod) arranged in a state where both front and rear ends thereof are exposed in the drilling material arrangement hole 12 to be drilled. A non-shrinkable mortar is filled in the gap between the fixed collar 13 and the collar arrangement hole 12, and the fixed collar 13 is disposed in the collar arrangement hole 12 in a non-rotatable state.

  In addition, the saddle material disposing hole 12 is formed with a hole in advance in the metal plate material 11 and the beam 1 before the metal plate material 11 is disposed, or the holes are collectively formed after the metal plate material 11 is disposed, After the metal plate material 11 having the holes is disposed, the holes are formed in the beam 1 using the holes as guide holes.

  Subsequently, the fixing member 2 and the push-up member 4 are connected by the connecting member 3. The connecting member 3 includes an oblique member 14, a metal plate-like fixed end connecting member 16 having a fixing member insertion hole 15 through which the fixing member 13 of the fixing member 2 fixed to one end of the oblique member 14 is inserted, It comprises a metal plate-like movable end connecting member 18 provided with a flange insertion hole 17 through which a metal flange 22 provided in a push-up member 4 (described later) fixed to the other end of the diagonal member 14 is inserted. Yes, the same shape is provided on both the front and rear sides of the fixing member 2. Moreover, this connection member 3 is comprised symmetrically.

  In this embodiment, the movable end connecting member 18 is provided as a push-up member 4 at each of the front and rear positions of the beam 1, and the left and right diagonal members 14 are respectively provided on the front and rear sides of the beam 1. The connecting member 18 is fixedly connected to the left and right sides. The movable end connecting member 18 may be provided on each of the left and right diagonal members 14 on the front and rear sides of the beam 1 (two on each side, a total of four).

  The push-up member 4 is provided at a position equidistant from the left and right fixing members 2, and a plurality of screw holes 20 into which push-up bolts to be push-up bodies 8 are screwed are arranged on the upper surface (this embodiment). In the example, four squares are provided, and underneath the base 21 having a substantially horizontal H-shaped cross-section, the brace support holes 23 for supporting the front and rear ends of the brace 22 are respectively formed in a straight line. In addition, each hanging plate 24 has a configuration in which four hanging plates 24 for holding the brazing material are suspended, and each hanging plate 24 is spaced a little wider than the thickness of the movable end connecting member 18 on each of the front and rear side surfaces of the beam 1. A saddle member 22 is installed between the pair of front and rear hanging plates 24 (after the movable end connecting member 18 is disposed).

  In this embodiment, the fixed end connecting member 16 is fixed to one end side by fixing means such as welding, and the right side fixing member 16 of the right end oblique member 14 in FIG. Insert the front end of the saddle member 13 and insert the split pin 25 into the hole provided at the front end of the fixed saddle member 13 to prevent it from coming off (the same applies to the retaining by the split pin 25). The large-diameter portion 26 fixed by fixing means such as welding on the other end side is fixed to the right end portion of the movable end connecting member 18 through the installation plate member 28 having the insertion screw hole through which the fixing bolt 27 is inserted and screwed. In FIG. 3, the fixed end connecting member 16 is fixed to one end side, and the front end of the left fixing rod 13 is inserted into the fixed end connecting member 16 in the same manner as described above. The other end side of the left diagonal member 14 is fixed to the left end portion of the movable end connecting member 18 by the fixing bolt 27 as described above. Then, the connecting member 3 on the front side is connected to the fixing member 2 (FIG. 4). Similarly, the connecting member 3 on the rear side surface of the beam 1 is connected to the fixing member 2. Reference numerals 29 and 30 in the figure are insertion holes through which the fixing bolts 27 are inserted.

  The push-up member 4 is disposed on the connecting member 3 so that the front and rear movable end connecting members 18 are disposed between the pair of front and rear drooping plates 24 of the push-up member 4 (FIG. 5). In the state where the brazing material support hole 23 and the brazing material insertion hole 17 of the movable body connecting member 18 are communicated with each other, the brazing material 22 is inserted into each hole in the communication state, and is prevented from being detached by the split pin 25 (same as above) Do the same on the front and back sides of beam 1.)

  Accordingly, the fixed collar member 13 and the collar member 22, the fixed end coupling member 16 and the movable end coupling member 18 are pivotally attached (pin coupled) to each other.

  In this embodiment, as described above, the movable end connecting member 18 and the push-up member 4 may be pin-coupled before connecting to the diagonal member 14, for example. Further, reference numeral 31 in the figure is an abutting material for the push-up body 8 fixed to the lower surface of the beam 1 by a metal anchor 10, and this abutting material 31 may be provided at any time, but the fixing member 2 is provided. After that, it is preferable to provide it at a position that is equidistant from the left and right fixing members 2 as a mark during operation.

  Subsequently, the jack receiving member 5 having a horizontal H-shaped cross section is connected and fixed to the lower surface of the base 21 of the push-up member 4 so that the longitudinal direction is aligned with the beam 1 between the front and rear hanging plates 24. (FIGS. 6 and 7). In the figure, 32 is a bolt for fixing the connection, 33 is a bolt connection hole, and 34 is a jacking material.

  Subsequently, the jack members 6 are arranged one by one so as to be as close as possible to the left and right sides of the push-up member 4 on the upper surface of the jack receiving member 5 (FIG. 8). In this embodiment, a general hydraulic jack is used as the jack member 6. Note that the number of jack members 6 may be not limited to one, but a plurality of jack members 6 may be provided, but it is preferable to arrange the same number of pairs so as to be paired at equal intervals across the push-up member 4 (push-up body 8).

  Subsequently, the jack member 6 is driven to move the movable end 7, and the lower surface of the beam 1 is pressed with a predetermined pressing force to separate the beam 1 and the lifting member 4 (FIG. 9). The pressing force of each jack member 6 is set to be the same. Further, the jack members 6 need not be driven simultaneously, but are preferably driven as much as possible. Moreover, it is better to use the same manufacturer and the same model number as much as possible.

  Subsequently, in a state in which the lower surface of the beam 1 is pressed with a predetermined pressing force by the jack member 6 (in a state where the movable end 7 has stopped moving), at least the jack members 6 are loosened until the jack members 6 are loosened. The lower surface of the beam 1 is pushed up by the tail portion of the push-up bolt by screwing and projecting from the upper surface (FIG. 10).

  Subsequently, each loose jack member 6 is removed, and the jack receiving member 5 is also removed simultaneously (or thereafter) (FIG. 11).

  As described above, the push-up member 4 is pushed down by the reaction force from the beam 1, but a tensile force (tensile force) is generated in the connecting member 3 so as to maintain a predetermined pressing force set by the jack member 6. The position of the push-up body 8 (extrusion member 4) is maintained, so that a predetermined push-up force always acts on the beam 1, so that the vertical load applied to the beam 1 is always offset, and the beam 1 and the building The overall strength (yield strength) can be improved by a simple and inexpensive method, and unlike the member reinforcement design, by measuring the pushing force (pressing load) by the jack member 6, the pushing member 4 can It becomes easy to grasp the offset load and the like, and the load reduction design of the building becomes easier.

12 to 16 show the relationship between a predetermined pressing force P applied by the jack (the resultant force of the two jacks) and a tensile force T (reaction force from the beam) applied to the diagonal member. FIGS. 17 and 18 are schematic explanatory diagrams (model diagrams) of the present embodiment for explaining the balance of forces. From θ = Tan ⁻¹ (H / L), T = T _LF (diagonal material 1 ) = T _RF (Diagonal material 2) = T _LB (Diagonal material 3) = T _RB (Diagonal material 4) = P / (4 sin θ). 12 to 16, the relationship between the pressing force applied by the jack and the tensile force applied to the diagonal is substantially the same as the calculated value of P / (4 sin θ). It was confirmed that the load) could be set appropriately, and it was confirmed that the design for reducing the load of the building would be easier.

DESCRIPTION OF SYMBOLS 1 Beam 2 Fixed member 3 Connection member 4 Push-up member 5 Jack receiving member 6 Jack member 7 Movable end 8 Push-up body

Claims (5)

  A method for reinforcing a beam of an existing building, wherein a fixing member is provided in a fixed state at each of the positions near the left and right ends of the beam, and the left and right positions of the beam are positioned near the center of the beam between the fixing members. A push-up member provided via a fixed member and a connecting member to support the lower surface of the beam and having a jack member and a jack receiving member is provided, the movable end of the jack member is moved, and a predetermined push-up force is applied to the beam. In this state, the movable end stops moving, and the push-up body, which is provided on the push-up member and protrudes to contact the lower surface of the beam and pushes up the lower surface, protrudes until the movable end and the beam are separated from each other. A beam reinforcing method comprising: removing the jack member after supporting the beam by a body.   2. The beam reinforcing method according to claim 1, wherein the jack receiving member is removed together with the jack member.   The beam reinforcement method according to any one of claims 1 and 2, wherein the connecting member, the fixing member, and the push-up member are pivotally attached to each other. Method.   4. The beam reinforcing method according to claim 1, wherein at least one of the jack members is disposed at each of left and right positions of the push-up member so as to sandwich the push-up member. 5. How to reinforce the beam.   5. The beam reinforcing method according to claim 1, wherein the connecting member is provided on each of front and rear sides of the fixing member and the push-up member. 6.