Arch frame

Abstract

To provide an arch frame that can be realized while the main members are made of wood or other materials that make it difficult to secure a large bending load capacity.SOLUTION: An arch frame K is configured in a multi-layer structure having an upper-layer side arch frame part 1 and a lower-layer side arch frame part 2, and is configured by stacking and arranging a large number of upper-layer side arch beams 11 constituting the upper-layer side arch frame part 1 and a large number of lower-layer side arch beams 21 constituting the lower-layer side arch frame part in an intersecting state in a plan view by shifting positions in a vertical direction. A compression ring 3 to which the tip parts of the upper-layer side arch beams 11 and the lower-layer side arch beams 21 are joined is provided at the top of the frame, and the compression ring 3 has a height dimension H3 equal to or greater than the sum of beam depth H1 of the upper-layer side arch beams 11 and beam depth H2 of the lower-layer side arch beams 21.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an arch structure that can be used in buildings having a large space.

Background Art

[0002] Patent Document 1 discloses a steel frame arch structure configured in a multi-layer structure having an upper-layer arch structure part and a lower-layer arch structure part. A large number of upper-layer arch beams (frame members 10) made of square steel pipes constituting the upper-layer arch structure part and a large number of lower-layer arch beams (frame members 10) made of square steel pipes constituting the lower-layer arch structure part are arranged in a staggered state in the vertical direction and in an intersecting state in plan view. In such an arch structure, at the intersection of the upper-layer arch beam of the upper-layer arch structure part and the lower-layer arch beam of the lower-layer arch structure part, the deformation amount of the entire structure can be suppressed by the mutual support of both arch beams in a holding state.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the steel frame arch structure described in Patent Document 1 above, although a steel wire tension ring (26) is provided on the outer peripheral side of the structure to resist the force that each arch structure part tends to spread outward due to its own weight with axial tensile strength, each arch beam is a cantilever beam with a free end on the tip side. Therefore, the arch structure is realized by utilizing the large bending strength of the square steel pipes constituting each arch beam. However, it is required to realize the above arch structure while making the main members difficult to ensure a large bending strength such as wood. In view of this situation, the main problem of the present invention is to provide an arch structure that can be realized while making the main member difficult to secure a large bending strength such as wood.

Means for Solving the Problems

[0005] The first characteristic configuration of the present invention is configured in a multi-layer structure having an upper-layer arch structure portion and a lower-layer arch structure portion. An arch structure configured by laminating a number of upper-layer arch beams constituting the upper-layer arch structure portion and a number of lower-layer arch beams constituting the lower-layer arch structure portion in a staggered state in the vertical direction and in an intersecting state in plan view, A compression ring to which the tip portions of the upper-layer arch beam and the lower-layer arch beam are joined is provided at the top of the structure, and the compression ring has a height dimension equal to or greater than the sum of the deflections of the upper-layer arch beam and the lower-layer arch beam.

[0006] According to this configuration, since a compression ring to which the tip portions of each arch beam are joined is provided at the top of the structure, the attitude of each arch beam can be maintained by the axial compressive strength of the compression ring on the top side of the structure. Furthermore, since the tip side of each arch beam also becomes a fixed end, not only the bending strength of each arch beam but also the axial strength of each arch beam can be effectively utilized to realize an arch structure. Moreover, since the compression ring at the top of the structure has a height dimension equal to or greater than the sum of the deflections of the upper-layer arch beam and the lower-layer arch beam, both the upper-layer arch beam and the lower-layer arch beam, which are offset in the vertical direction, can be appropriately joined to the compression ring while maintaining their original vertical relationship, and both the upper and lower arch structure portions can be constructed with the expected strength. Therefore, it is possible to provide an arch structure that can be realized while making the main member difficult to secure a large bending strength such as wood.

[0007] The second characteristic configuration of the present invention is that the upper-layer arch beam and the lower-layer arch beam are configured by joining a number of straight wooden materials in a polygonal line shape. One of the upper - layer arch beams and the lower - layer arch beams has a joint between straight - line timbers formed as a fixed joint. The other of the upper - layer arch beam and the lower - layer arch beam is characterized in that the joint between straight - line timbers is formed as a pin joint.

[0008] According to this configuration, since each arch beam is formed by joining a large number of straight - line timbers in a polygonal - line shape, the arch beam can be inexpensively and simply configured using straight - line timbers without the labor of manufacturing curved timbers.

[0009] And one of the upper - layer arch beam and the lower - layer arch beam has a joint between straight - line timbers formed as a pin joint, so that it is possible to change the posture of the straight - line timbers at the joint. Therefore, for example, at the intersection of one of the upper - and - lower arch beams and the other upper - and - lower arch beam, the posture of the joint of one of the upper - and - lower arch beams can be adjusted so that the upper or lower surface of one of the upper - and - lower arch beams is in surface contact with the lower or upper surface of the other upper - and - lower arch beam, increasing the moving frictional resistance between the two. Thus, the positional deviation at the intersection of the upper - layer arch beam and the lower - layer arch beam can be suppressed due to the increase in the above - mentioned moving frictional resistance, and the effect of suppressing the deformation amount due to the mutual support of the two arch beams in a holding state at the intersection can be improved.

[0010] Furthermore, the other of the upper - layer arch beam and the lower - layer arch beam has a joint between straight - line timbers formed as a fixed joint, so that the bending moment can be appropriately transmitted at the joint, improving the bending rigidity of the other upper - and - lower arch beam and complementing the bending rigidity of one of the upper - and - lower arch beams.

[0011] The third characteristic configuration of the present invention is that the lower - layer arch beam has a joint between straight - line timbers formed as a fixed joint. The upper - layer arch beam is characterized in that the joint between straight - line timbers is formed as a pin joint.

[0012] According to this configuration, since the joints between the linear timbers in the lower-layer arch beam are fixed joints, the bending rigidity of the lower-layer arch beam can be improved. Then, with the lower-layer arch beam having improved bending rigidity, the upper-layer arch beam where the joints between the linear timbers are pin joints is placed on the upper surface and supported from the lower side, so that the bending rigidity of the upper-layer arch beam can be efficiently complemented.

[0013] The third characteristic configuration of the present invention lies in that the intersection of the upper-layer arch beam and the lower-layer arch beam is position-retained by a position-retaining means.

[0014] According to this configuration, the position displacement of the intersection of the upper-layer arch beam and the lower-layer arch beam can be further suppressed by the position-retaining means, and the effect of suppressing the deformation amount due to the two arch beams supporting each other in a holding state at the intersection can be further improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying out the Invention

[0016] Embodiments of the arch structure of the present invention will be described with reference to the drawings. As shown in FIGS. 1(A) and 1(B), this arch structure K is configured in a multi-layer structure having an upper-layer arch structure portion 1 and a lower-layer arch structure portion 2. A number of wooden upper-layer arch beams 11 constituting the upper-layer arch structure portion 1 and a number of wooden lower-layer arch beams 21 constituting the lower-layer arch structure portion 2 are laminated in a crossed state with a displacement in the vertical direction.

[0017] In what is shown in FIG. 1(A), in the upper-layer arch structure portion 1, the direction in which each upper-layer arch beam 11 extends in plan view is set to a clockwise inclination direction that inclines from the radial direction of the structure passing through the center of the structure in the clockwise direction. On the other hand, in the lower-layer arch structure portion 2, the direction in which each lower-layer arch beam 21 extends in plan view is set to a counterclockwise inclination direction that inclines from the radial direction of the structure in the counterclockwise direction. Conversely, the direction in which the upper-layer arch beam 11 extends in plan view may be set to the counterclockwise inclination direction, and the direction in which the lower-layer arch beam 21 extends in plan view may be set to the clockwise inclination direction.

[0018] In this way, by setting the direction in which the upper-layer arch beam 11 extends and the direction in which the lower-layer arch beam 21 extends to be inclined in opposite directions, each of the upper-layer arch beams 11 of the upper-layer arch structure portion 1 is laminated in a crossed state with 2 to 3 (an example of a plurality) of the lower-layer arch beams 21 of the lower-layer arch structure portion 2, and a number of crossing portions 8 are formed. At these a number of crossing portions 8, the two arch beams 11 and 21 support each other in a holding state, thereby suppressing the amount of deformation of the entire structure.

[0019] Furthermore, the arch structure K is provided with a wooden compression ring 3 to which the tip ends of the respective arch beams 11 and 21 are joined at the top of the structure, and a wooden tension ring 4 to which the base ends of the respective arch beams 11 and 21 are joined at the outer peripheral portion of the structure.

[0020] Therefore, the compression ring 3 at the top of the structure resists the force that each arch structure part 1, 2 tends to fall inward due to its own weight with axial compressive strength, and the tension ring 4 at the outer periphery of the structure can resist the force that each arch structure part 1, 2 tends to expand outward due to its own weight with axial tensile strength. Further, due to the compression ring 3 at the top of the structure, the tip sides of the respective arch beams 11, 21 also become fixed ends, so that not only the bending strength of each arch beam 11, 21 but also the axial strength of each arch beam 11, 21 can be effectively utilized. The following will add an explanation of the detailed configuration of each part.

[0021] As shown in FIG. 2, each of the arch beams 11, 21 is configured by joining a number of linear timbers M1 with rectangular cross-sections in a broken line shape. At the joint 5 between the linear timbers M1, a flat joint plate 5A is disposed across the left and right lateral surfaces of a pair of linear timbers M1 to be joined, and a drift pin 5B is provided that penetrates across the joint plate 5A and the linear timber M1.

[0022] The joint 5 of the upper-layer arch beam 11 of the upper-layer arch structure part 1 is a pin joint PJ in which the posture of the joint 5 can be changed by the rotation of the linear timber M1 around the drift pin 5B by setting the number of drift pins 5B penetrating into each linear timber M1 to one (two in total for the joints 5).

[0023] Then, at the intersection 8 of the upper-layer arch beam 11 of the upper-layer arch structure part 1 and the lower-layer arch beam 21 of the lower-layer arch structure part 2, the posture of the joint 5 of the upper-layer arch beam 11 is adjusted so that the lower surface of the upper-layer arch beam 11 is in surface contact with the upper surface of the lower-layer arch beam 21 to increase the moving frictional resistance between the two. Therefore, due to the increase in this moving frictional resistance, the displacement at the intersection 8 of the upper-layer arch beam 11 and the lower-layer arch beam 21 can be suppressed, and the effect of suppressing the amount of deformation due to the mutual support of the two arch beams 11, 21 in a holding state at the intersection 8 can be improved.

[0024] The joint 5 of the lower-arch beam 21 of the lower-arch structure 2 is set as a fixed joint KJ capable of transmitting a bending moment by setting the number of drift pins 5B penetrating each linear wood M1 to two (four in total at the joint 5) vertically. Therefore, the bending rigidity of the lower-arch beam 21 can be improved, and the bending rigidity of the upper-arch beam 11 can be efficiently complemented in a form where the upper-arch beam 11 is placed on the lower-arch beam 21 and supported from below.

[0025] Furthermore, in this embodiment, the intersection 8 between the upper-arch beam 11 and the lower-arch beam 21 is held in position by the position-holding means 6. As shown in FIG. 3, the position-holding means 6 is composed of bolts 6A etc. attached in a state spanning the upper-arch beam 11 and the lower-arch beam 21. Although not shown in the figure, the tip and base ends in the bolt-axis direction of the bolt 6A are provided with anti-drop means such as nuts. By holding the intersection 8 in position by the position-holding means 6 in this way, the positional deviation of the intersection 8 of the intersection 8 between the upper-arch beam 11 and the lower-arch beam 21 can be further suppressed, and the effect of suppressing the amount of deformation due to the two arch beams 11 and 21 supporting each other in a holding state at the intersection 8 can be further improved.

[0026] In addition to or instead of the above structure, the position-holding means 6 may be configured to fit the lower surface of the upper-arch beam 11 and the upper surface of the lower-arch beam 21 by forming a fitting portion such as a convex portion and a fitted portion such as a concave portion between the opposing surfaces of the lower surface of the upper-arch beam 11 and the upper surface of the lower-arch beam 21.

[0027] As shown in the enlarged view of FIG. 1(B), the compression ring 3 has a height dimension H3 equal to or greater than the sum of the beam deflections H1 of the upper-arch beam 11 of the upper-arch structure 1 and the beam deflection H2 of the lower-arch beam 21 of the lower-arch structure 2. Therefore, the tip of the upper-arch beam 11 can be joined to the upper side of the outer peripheral surface of the compression ring 3 in its original position and posture, and the tip of the lower-arch beam 21 can be joined to the lower side of the outer peripheral surface of the compression ring 3 in its original position and posture. Therefore, both the tip of the upper arch beam 11 and the tip of the lower arch beam 21, which are misaligned in the vertical direction, can be appropriately joined to the compression ring 3 while maintaining their original vertical relationship.

[0028] As shown in FIGS. 3(A) and 3(B), the compression ring 3 is configured by arranging a vertically oriented steel central plate 31 extending from the upper side to the lower side of its rectangular cross-section at the central position in plan view, and arranging cover timbers M2 on both side surfaces of the central plate 31.

[0029] As shown in FIG. 3(A), at the joint portion 7A between the compression ring 3 and the upper arch beam 11, a steel gusset plate 71A extending from the upper side of the outer peripheral surface of the central plate 31 of the compression ring 3 toward each upper arch beam 11 is provided. Then, at each joint portion 7A, with the gusset plate 71A inserted into the groove formed at the central position in the beam width direction of the end of the upper arch beam 11, a drift pin 71B is penetrated from the beam width direction across the end of the upper arch beam 11 and the gusset plate 71A.

[0030] As shown in FIG. 3(B), at the joint portion 7B between the compression ring 3 and the lower arch beam 21, a steel gusset plate 72A extending from the lower side of the outer peripheral surface of the central plate 31 of the compression ring 3 toward each lower arch beam 21 is provided. Then, at each joint portion 7B, with the gusset plate 72A inserted into the groove formed at the central position in the beam width direction of the end of the lower arch beam 21, a drift pin 72B is penetrated from the beam width direction across the end of the lower arch beam 21 and the gusset plate 72A.

[0031] Note that various configurations can be adopted for the wooden tension ring 4. Although illustration is omitted, for example, when the base end of the upper arch beam 11 and the base end of the lower arch beam 21 are joined to the upper surface of the tension ring 4 in a state where they are displaced in the radial direction of the structure, the width of the tension ring 4 can be set to a width equal to or greater than the sum of the beam depth H1 of the upper arch beam 11 and the beam depth H2 of the lower arch beam 21.

[0032] In this way, the upper arch beam 11 can be joined to the outer side of the upper surface of the tension ring 4 in its original position and orientation, and the lower arch beam 21 can be joined to the inner side of the outer peripheral surface of the tension ring 4 in its original position and orientation. Therefore, both the base end of the upper arch beam 11 and the base end of the lower arch beam 21, which are displaced in the radial direction of the structure, can be appropriately joined to the tension ring 4 in their original positions and orientations.

[0033] Also, for example, when the base end of the upper arch beam 11 and the base end of the lower arch beam 21 are joined to the inner peripheral surface of the tension ring 4 in a state where they are displaced in the vertical direction, the height dimension of the tension ring 4 can be set to a height dimension equal to or greater than the sum of the beam depth H1 of the upper arch beam 11 and the beam depth H2 of the lower arch beam 21.

[0034] In this way, the upper arch beam 11 can be joined to the upper side of the inner peripheral surface of the tension ring 4 in its original position and orientation, and the lower arch beam 21 can be joined to the lower side of the inner peripheral surface of the tension ring 4 in its original position and orientation. Therefore, both the base end of the upper arch beam 11 and the base end of the lower arch beam 21, which are displaced in the vertical direction, can be appropriately joined to the tension ring 4 in their original positions and orientations.

[0035] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each of the embodiments described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0036] (1) The joints 7A and 7B between the compression ring 3 and the respective arch beams 11 and 21 are not limited to the configurations described in the above embodiments, and various configuration changes are possible. For example, in the above embodiment, as shown in FIG. 2, in the joints 7A and 7B between the compression ring 3 and the respective arch beams 11 and 21, the case where the compression ring 3 and the respective arch beams 11 and 21 are joined by the gusset plate 71A and the drift pin 71B was taken as an example. However, a fitting portion such as a convex portion and a fitted portion such as a concave portion are formed between the opposing surfaces of the compression ring 3 and the respective arch beams 11 and 21, and the lower surface of the upper layer arch beam 11 and the upper surface of the lower layer arch beam 21 are fitted together, and the compression ring 3 and the respective arch beams 11 and 21 may be fastened with a draw bolt or the like.

[0037] (2) Also, the joints 5 between the linear timbers M1 that make up the respective arch beams 11 and 21 and the position holding means 6 at the intersection 8 of the respective arch beams 11 and 21 are not limited to the configurations described in the above embodiments, and various configuration changes are possible.

[0038] (3) Each of the upper layer arch beam 11, the lower layer arch beam 21, the compression ring 3, and the tension ring 4 is not limited to the wooden ones shown in the above-described embodiment, and may be composed of other materials such as square steel pipes and steel frames.

Explanation of Reference Numerals

[0039] 1 Upper layer arch structure part 2 Lower layer arch structure part 3 Compression ring 5 Joint 6 Position holding means 8 Intersection 11 Upper layer arch beam 21 Lower layer arch beam H1 Beam depth of upper layer arch beam H2 Beam depth of lower layer arch beam H3 Height dimension K Arch structure KJ Fixed joint M1 Linear timber PJ Pin Joint

Claims

1. It is configured in a multi-layer structure having an upper-layer arch structure portion and a lower-layer arch structure portion, A large number of upper-layer arch beams constituting the upper-layer arch structure portion and a large number of lower-layer arch beams constituting the lower-layer arch structure portion are laminated and arranged in a crossed state in a plan view with a vertical displacement, and it is an arch structure configured as such, A compression ring to which the tip portions of the upper-layer arch beam and the lower-layer arch beam are joined is provided at the top of the structure, and the compression ring has a height dimension equal to or greater than the sum of the beam deflections of the upper-layer arch beam and the lower-layer arch beam. Arch structure.

2. The upper-layer arch beam and the lower-layer arch beam are configured by joining a large number of linear timbers in a polygonal line shape, One of the upper-layer arch beam and the lower-layer arch beam has a fixed joint at the joint between the linear timbers, The arch structure according to claim 1, wherein the other of the upper-layer arch beam and the lower-layer arch beam has a pin joint at the joint between the linear timbers.

3. The lower-layer arch beam has a fixed joint at the joint between the linear timbers, The arch structure according to claim 2, wherein the upper-layer arch beam has a pin joint at the joint between the linear timbers.

4. The arch structure according to any one of claims 1 to 3, wherein the intersection between the upper-layer arch beam and the lower-layer arch beam is held in position by a position holding means.

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