JP5460368B2 - Reinforced concrete formwork structure - Google Patents

Description

  The present invention relates to a formwork structure for extending a horizontal beam-like or vertical column-like reinforcing concrete structure that reinforces an existing building in contact with the surface of the existing building.

  As one method for reinforcing an existing building, as described in Patent Document 1, a reinforcing belt-like iron plate is fixed to an anchor bolt driven into an existing building, as described in the patent document 1, etc. A reinforcing method has been proposed in which reinforcing beams and pillars are added along the surface of the existing building so as to be disposed at an appropriate interval from the surface of the existing building and include the reinforcing strip-shaped iron plate. . Specifically, in the formwork structure described in Patent Document 1, a U-shaped clamp is fitted and fixed to both sides of the reinforcing strip-shaped iron plate, and the inner end of the separator is screwed to the U-shaped clamp. The mold plate was supported on the outer end portion of the separator.

JP 2008-163697 A

  As described in Patent Document 1, in the conventional reinforcing concrete formwork structure, the formwork plate parallel to the surface of the existing building is a reinforcing belt-like shape attached to the outside of the existing building via an anchor bolt. Since it is configured to connect to both sides of the steel plate via separators, even if a wide reinforcing steel strip is used to widen the reinforcing concrete structure to be added, it is parallel to the surface of the existing building. An intermediate position in the width direction of a wide formwork plate cannot be connected and supported to the reinforcing strip-shaped iron plate by a separator. Therefore, the intermediate portion in the width direction of the wide formwork plate parallel to the surface of the existing building tends to bulge outward by the cast concrete pressure, and a high-strength formwork cannot be assembled.

  The present invention proposes a reinforcing concrete formwork structure that can solve the conventional problems as described above, and the reinforcing concrete formwork structure according to the present invention according to claim 1 comprises: In order to facilitate understanding of the relationship with the examples described later, when the reference numerals used in the description of the examples are shown in parentheses, a plate parallel to the surface (2a) of the existing building (2) A reinforcing member (3, 27) having a portion is fixed to an existing building (2) by anchor bolts (6a to 6c) and forms a concrete placing space that encloses the reinforcing member (3, 27). In the reinforcing concrete form structure in which the frame plate (4, 5) is connected to the reinforcing member (3, 27), the anchor bolts (6a to 6c) are arranged on the reinforcing member (3, 27). A nut is secured by penetrating the plate portion, and is separated to the tip screw shaft portion (7) protruding from the plate portion of the anchor bolt (6b). The nut connecting plate (14) is fastened with a nut, and the screw hole (20) provided in the separator connecting plate (14) is inserted into the inner end screw shaft of the separator (12) oriented in parallel with the anchor bolt (6b). The first mold parallel to the surface (2A) of the existing building (2) of the mold plate (4, 5) is connected to the outer end of the separator (12). The frame plate (4) is supported.

  When carrying out the present invention, specifically, as described in claim 2, the separator connecting plate (14) is an anchor bolt insertion hole through which the tip screw shaft portion (7) of the anchor bolt (6B) is inserted. A through screw hole (20) through which the inner end screw shaft portion (12a) of the separator (12) is screwed and penetrated in the lateral side position of the anchor bolt (6B) in the plate material (18) provided with (19). It can be provided.

  According to the configuration of the present invention, in order to increase the width of the reinforcing concrete structure to be added, when a wide strip-shaped iron plate or the like is used as the reinforcing member, the wide form plate parallel to the surface of the existing building Since the intermediate position in the width direction can be connected to and supported by the reinforcing member (such as a strip-shaped iron plate) with a separator, the middle portion in the width direction of the wide form plate parallel to the surface of the existing building is This eliminates the risk of bulging outwards, and allows a high-strength formwork to be assembled. Moreover, the separator is connected to an anchor bolt to which the reinforcing member (such as a strip-shaped iron plate) is attached, and compared with the case where the separator connecting member is attached to the reinforcing member (such as a strip-shaped iron plate) by welding. Is easy and inexpensive.

  In addition, according to the structure of Claim 2, since the separator connection plate which can be nut-fastened to an anchor bolt can be comprised only by the drilling process and screw hole process with respect to one board | plate material, this invention is implemented further cheaply. be able to.

It is a vertical side view which shows the formwork structure in the case of constructing a horizontal beam-like reinforcement concrete structure. It is an expanded vertical side view of the principal part. It is a perspective view of the separator connection plate to be used. It is a vertical side view which shows the separator connection part which uses a U-shaped clamp. Fig. A is a perspective view of the U-shaped clamp, and Fig. B is a cross-sectional plan view showing the U-shaped clamp and a strip-shaped iron plate. It is a vertical side view which shows another Example. It is a vertical side view of the U-shaped clamp main body used in the Example shown in FIG. It is a top view of the same clamp body. It is a vertical front view of the same clamp body. It is an expansion vertical side view of the principal part of FIG.

  In FIG. 1, reference numeral 1 denotes a formwork structure in the case of constructing a horizontal beam-shaped reinforcing concrete structure in contact with the surface 2 a of the existing building 2, which is arranged in parallel with the surface 2 a of the existing building 2. The strip-shaped iron plate 3, the first mold plate 4 arranged parallel to the surface 2 a of the existing building 2 on the outside of the strip-shaped iron plate 3, and the surface 2 a of the existing building 2 on the lower side of the strip-shaped iron plate 3 The second mold plate 5 is arranged.

  The strip-shaped iron plate 3 is fixed to the existing building 2 by anchor bolts 6a to 6c at three positions in the vicinity of both sides in the width direction and a substantially central position. A plurality of anchor bolts 6a to 6c are arranged at appropriate intervals with respect to the length direction of the strip-shaped iron plate 3, each inner end portion is embedded and fixed to the existing building 2, and the other end portion is strip-shaped. A two-stage presser nut that includes a screw shaft portion 7 penetrating the iron plate 3 and prevents the belt-like iron plate 3 from moving in a direction away from the existing building 2 on the screw shaft portions 7 of all anchor bolts 6a to 6c. 8 is screwed and fastened, and the screw shaft portion 7 of the anchor bolts 6a to 6c at an appropriate selected position is provided with a two-stage block that prevents the strip-shaped iron plate 3 from moving in the direction approaching the existing building 2. The receiving nut 9 is screwed and fastened.

  The first mold plate 4 is formed by the first separators 10 and 11 disposed on both sides in the width direction of the strip-shaped iron plate 3 and the second separator 12 disposed at a substantially central position in the width direction of the strip-shaped iron plate 3. It is supported by connection. A plurality of the first separators 10 and 11 and the second separator 12 are arranged at appropriate intervals in the length direction of the strip-shaped iron plate 3, and the first separators 10 and 11 are arranged on both sides 3 a of the strip-shaped iron plate 3. , 3b is coupled to the belt-like iron plate 3 in a direction perpendicular to the first mold plate 4 by a U-shaped clamp 13 which is externally fitted and fixed to the frame 3b. The second separator 12 is a separator connecting plate 14 attached to an anchor bolt 6b located at a substantially central position in the width direction of the belt-like iron plate 3 among the anchor bolts 6a to 6c attaching the belt-like iron plate 3 to the existing building 2. Are coupled to the strip-shaped iron plate 3 in parallel with the first separators 10 and 11. The second mold plate 5 is connected to and supported by the strip-shaped iron plate 3 via a third separator 15 that is coupled to the side 3 b of the strip-shaped iron plate 3.

  Each form plate 4, 5 is supported by the strip-shaped iron plate 3 by being joined to the outer end of each separator 10-12, 15 by a conventionally known method, and on the outside of the form plate 4, 5. The mold frame structure 1 is configured together with the presser frame material (not shown) disposed. In the illustrated example, the mold frame structure is used to build a horizontal beam-like reinforcing concrete structure. The upper side of the inner concrete placement space formed by the frame structure 1 is open, but when it is a formwork structure for constructing a vertical columnar reinforcing concrete structure, as shown by virtual lines, The concrete casting space in which the second mold plate 5 is supported also on the side 3a side of the belt-like iron plate 3 via the third separator 15 and the entire periphery is closed is the existing building 2 and the first mold plate 4. And the second mold plate 5.

  In addition, the structure which connects the 1st separators 10 and 11 and the 3rd separator 15 to the strip | belt-shaped iron plate 3 is the same as the thing of the patent document 1 shown previously, and the 1st separators 10 and 11 are the strip | belt-shaped iron plates 3. The third separator 15 is connected to the U-shaped clamps 13 fitted and fixed to the both sides 3a and 3b by screw coupling, and the third separator 15 is a belt-like shape between the pair of U-shaped clamps 13 for attaching the first separators 10 and 11. It is long at one or both ends of a connecting rod (using a separator having screw shafts at both ends) 16 erected along the width direction of the strip-shaped iron plate 3 on the back side of the iron plate 3 (the side where the existing building 2 is located). It is connected via nuts 17a and 17b.

  As shown in FIG. 3, the separator connecting plate 14 for attaching the second separator 12 to the anchor bolt 6b is provided with an anchor bolt insertion hole 19 and a through screw hole 20 for connecting the separator to a plate material 18 having an appropriate thickness. As shown in FIG. 2, between the two presser nuts 8 screwed into the threaded shaft portion 7 of the anchor bolt 6b protruding from the belt-shaped iron plate 3, the threaded shaft is secured using the anchor bolt insertion hole 19. The separator connecting plate 14 fitted in the portion 7 is clamped and fixed, and the inner end screw shaft portion 12a of the second separator 12 is screwed into the through screw hole 20 protruding laterally from the anchor bolt 6b. Thus, the second separator 12 is coupled to the strip-shaped iron plate 3 in parallel with the anchor bolt 6b.

  As described above, the configuration in which the first separators 10 and 11 and the third separator 15 are connected to the strip-shaped iron plate 3 is the same as that described in Patent Document 1 described above, but this configuration can be simplified. Explaining, the U-shaped clamp 13 to be used is configured such that the U-shaped side plates 22a and 22b having the fitting recesses 21 are fitted to the side edges 3a and 3b of the belt-shaped iron plate 3 as shown in FIGS. A main body 23 that is connected and integrated by a connecting plate portion 22c parallel to the coupling direction, and two through screw holes 24a and 24b that are provided in the connecting plate portion 22c and are arranged in the length direction of the connecting plate portion 22c. And a fastening bolt 25 that threadably penetrates the through screw hole 24a on the fitting recess 21 side. Then, on the side opposite to the side where the connecting plate portion 22c is provided with respect to the fitting recess 21, projections 26a and 26b projecting inwardly from the U-shaped side plates 22a and 22b. It is comprised so that the said connecting rod 16 can be supported inside.

  Thus, the U-shaped clamp 13 having the above-described configuration is arranged such that the connecting plate portion 22c is positioned on the outside of the strip-shaped iron plate 3 (on the side opposite to the side where the existing building 2 is located). 3b is fitted in the fitting recess 21 and fixed to both sides 3a and 3b of the belt-like iron plate 3 by screwing the fastening bolts 25, and the inner end screw shaft portions 10a and 11a of the first separators 10 and 11 are formed in the U-shape. The clamp 13 is screwed into the through screw hole 24b. The pair of U-shaped clamps 13 at the position where the third separator 15 is attached allows the connecting rod 16 to be inserted along the back surface of the strip-shaped iron plate 3 inside the protrusions 26a and 26b of the both U-shaped clamps 13. The long nuts 17 a and 17 b are screwed and fastened to the both-end screw shaft portions 16 a protruding from both the U-shaped clamps 13, and the connecting rod 16 is installed between both the U-shaped clamps 13. The third separator 15 has an inner end screw shaft portion 15a in an empty region that is substantially half of a through screw hole of one side long nut 17b adjacent to the outside of the U-shaped clamp 13 or both side long nuts 17a and 17b. By screwing and fastening, the belt-like iron plate 3 is coupled via the pair of U-shaped clamps 13 and the connecting rod 16. In addition, the structure for couple | bonding the 1st separators 10 and 11 and the 3rd separator 15 with the strip | belt-shaped iron plate 3 is not specifically limited. For example, as indicated by phantom lines in FIG. 4, the connecting rod 16 may be inserted between the U-shaped side plate portions 22a and 22b between the connecting plate portion 22c of the U-shaped clamp 13 and the strip-shaped iron plate 3 (this In this case, the fastening bolt 25 presses the connecting rod 16 against the belt-like iron plate 3), and the inner end screw shaft portions 10 a, 11 a of the first separators 10, 11 are screwed into the through screw holes 24 instead of the fastening bolts 25. The first separators 10 and 11 may also serve as the fastening bolts 25.

  FIG. 6 shows an embodiment in which an H-shaped steel 27 is used as a reinforcing member in place of the belt-shaped iron plate 3. The H-shaped steel 27 is arranged such that the central plate portion 30 between both side flange portions 28 and 29 is parallel to the surface 2 a of the existing building 2, and the width direction of the central plate portion 30 is the same as the strip-shaped iron plate 3. Are fixed to the existing building 2 by anchor bolts 6a to 6c at three positions in the vicinity of both sides and the substantially central position in the width direction. The first separators 10 and 11 are externally fixed to the side sides 28a and 29a on the side close to the existing building 2 among the side sides 28a and 28b and 29a and 29b of the side flange portions 28 and 29 of the H-shaped steel 27. The first U-shaped clamp 31 is coupled to the H-shaped steel 27 in parallel to the side flange portions 28 and 29 and at a right angle to the first mold plate 4. The second separator 12 is formed by the separator connecting plate 14 attached to the anchor bolt 6b located at a substantially central position in the width direction between the flange portions 28 and 29 of the H-shaped steel 27 among the anchor bolts 6a to 6c. The first separators 10 and 11 are coupled to the H-section steel 27 in a parallel direction.

  The third separator 15 that supports the second mold plate 5 is fitted to both sides 29a and 29b of the flange portion 29 on the side close to the second mold plate 5 out of the both side flange portions 28 and 29 of the H-shaped steel 27. It is connected and supported to the H-shaped steel 27 via a second fixed U-shaped clamp 32. In FIG. 6, the first U-shaped clamp 31 that couples the first separator 11 on the flange portion 29 side of the H-shaped steel 27 to the side 29 a of the flange portion 29 includes the front third separator 15 on the flange portion 29. The second U-shaped clamp 32 that is concealed by the second U-shaped clamp 32 that is coupled to the side side 29a of the H-shaped steel 27 is hidden by the second U-shaped clamp 32 that is coupled to the side side 28a of the flange portion 28 of the H-shaped steel 27. The first separator 10 in front is hidden by a first U-shaped clamp 31 that couples the side 28 a of the flange portion 28 of the H-shaped steel 27.

  The first U-shaped clamp 31 that couples the first separators 10 and 11 to the H-shaped steel 27 and the second U-shaped clamp 32 that couples the second separator 15 to the H-shaped steel 27 have the same structure. The structure of the clamps 31 and 32 will be described with reference to FIGS. 7 to 10. Each of the clamps 31 and 32 is provided with a U-shaped side plate portion 34 a 34 b having a fitting recess 33 on the side of the flange portions 28 and 29 of the H-shaped steel 27. A main body 35 integrally connected by a connecting plate portion 34c parallel to the fitting direction with respect to 28a to 29b, and two through screw holes arranged in the connecting plate portion 34c in the length direction of the connecting plate portion 34c. Among the bolts 36a and 36b, a fastening bolt 37 that threadably penetrates the through screw hole 36a on the fitting recess 33 side is formed. The inner end screw shafts of the first separators 10 and 11 are fixed by hexagon nuts 38 fixed to the end portion on the fitting recess 33 side in the space surrounded by the U-shaped both side plate portions 34a and 34b and the connecting plate portion 34c. A screw hole portion 39 is formed in which the portions 10a and 11a are screwed together. Of the two through screw holes 36a and 36b arranged in the length direction of the connecting plate portion 34c, the through screw hole 36b on the side away from the fitting recess 33 Thus, a screw hole portion into which the inner end screw shaft portion 15a of the third separator 15 is screwed is configured.

  Although the hexagon nut 38 may be fixed by welding, in this embodiment, the corners at the symmetrical position of the hexagon nut 38 are formed in the engagement holes 40a and 40b formed in the U-shaped side plates 34a and 34b. The hexagon nut 38 is fixed at a fixed position of the main body 35 in a state in which the hexagon nut 38 cannot rotate by bringing the hexagon nut 38 into contact with the inner surface of the connecting plate portion 34c. Further, as indicated by phantom lines in FIGS. 7 and 9, the protruding portions 26a, 26b of the U-shaped clamp 13 in the previous embodiment are formed on the U-shaped side plates 34a34b of the U-shaped clamp having the above-described configuration. Thus, the U-shaped clamps 31 and 32 of the second embodiment can also be used as the U-shaped clamp 13 of the previous embodiment.

  When the U-shaped clamp having the above configuration is used as the first U-shaped clamp 31, the fitting recesses 33 of the U-shaped side plates 34 a and 34 b are formed in the flanges 28 and 29 of the H-shaped steel 27 as shown in FIG. The fastening bolts 37 are screwed by being externally fitted to the side sides 28a and 29a, and fixed to arbitrary positions in the length direction of the side sides 28a and 29a of the flange portions 28 and 29. Then, the inner end screw shaft portions 10 a and 11 a of the first separators 10 and 11 may be screwed into the screw hole portions 39 formed of the hexagon nut 38. When the U-shaped clamp having the above configuration is used as the second U-shaped clamp 32, similarly, the fitting recesses 33 of the U-shaped side plates 34a, 34b are arranged on both sides of the flanges 28, 29 of the H-shaped steel 27. The fastening bolts 37 are screwed by being externally fitted to the sides 28 a to 29 b, and are fixed at arbitrary positions in the length direction of the side sides 28 a to 29 b of the flange portions 28 and 29. Then, the inner end screw shaft portion 15a of the third separator 15 may be screwed into the through screw hole 36b.

  The formwork structure 1 shown in FIG. 1 assembled as described above, or the formwork structure 1 shown in FIG. 6, has a strip-shaped iron plate 3 or a steel plate 3 in the concrete placement space formed by the formwork plates 4 and 5. The H-shaped steel 27 is disposed as a reinforcing member, and the reinforcing member is fixed to the existing building 2 via the anchor bolts 6a to 6c. After arranging reinforcing bars around, concrete is placed in the concrete placement space formed by each form plate 4, 5, horizontal beam shape or vertical columnar shape incorporating the belt-like iron plate 3 or H-shaped steel 27 The reinforcing concrete structure can be constructed in contact with the surface 2 a of the existing building 2.

  The reinforcing concrete form structure of the present invention can be used as means for constructing a reinforcing concrete structure in the form of a horizontal beam or a vertical column in contact with the surface of an existing building.

DESCRIPTION OF SYMBOLS 1 Mold frame structure 2 Existing building 3 Band-shaped iron plate 4 1st mold frame plate 5 2nd mold frame plates 6a-6c Anchor bolt 7 Screw shaft part of anchor bolt 8 Presser nut 9 Receiving nut 10,11 First separator 10a, 11a Inner end screw shaft portion of the first separator 12 Second separator 12a Inner end screw shaft portion of the second separator 13 U-shaped clamp 14 Separator connecting plate 15 Third separator 15a Inner end screw shaft portion of the third separator 16 Connecting rod 17a , 17b Long nut 18 Plate material 19 Anchor bolt insertion hole 20 Through screw hole 21, 33 Fitting recess 22a, 22b, 34a, 34b U-shaped side plate 22c, 34c Connection plate 23, 35 Main body 24a, 24b, 36a, 36b Through screw hole 25, 37 Fastening bolt 26a, 26b Protruding part 27 H-section steel 28 29 H-section steel of the flange portion 30 of the H-shaped steel center plate portion 31 first arcuate clamp 32 second arcuate clamp 38 hexagonal nut 39 threaded holes 40a, 40b engaging hole

Claims (2)

  A reinforcing member having a plate portion parallel to the surface of the existing building is fixed to the existing building by anchor bolts, and a form plate that forms a concrete placement space containing the reinforcing member is connected to the reinforcing member. In the reinforcing concrete formwork structure, the anchor bolt is nut-fastened through the plate portion of the reinforcing member, and a separator connecting plate is attached to the tip screw shaft portion protruding from the plate portion of the anchor bolt. A nut is fixed, and an inner end screw shaft portion of the separator in a direction parallel to the anchor bolt is screwed into a screw hole portion provided in the separator connecting plate, and the form plate is connected to an outer end portion of the separator. Among them, a reinforcing concrete formwork structure that supports a first formwork plate parallel to the surface of an existing building.   The separator connecting plate is a through screw that screw-penetrates the inner end screw shaft portion of the separator at a lateral side position of the anchor bolt into a plate member provided with an anchor bolt insertion hole through which the tip screw shaft portion of the anchor bolt is inserted. The reinforcing concrete form structure according to claim 1, wherein holes are provided.

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