Linked prestressed structures

Abstract

The present invention provides a connected prestressed structure that can be used to create a long prestressed structure with the necessary prestress introduced. [Solution] The connected prestressed structure 100 comprises a plurality of prestressed structures 1A in which prestress is introduced in a direction in which the longitudinal end faces 2b1, 2b2 of the wooden member 2 are pressed against each other by tension members 3 that penetrate the wooden member 2 in the longitudinal direction Lo and have both ends 3b1, 3b2 exposed from the wooden member 2; a pair of holders that connect the plurality of prestressed structures 1A, with one end 3b2, 3b1 of each of the exposed tension members 3 of the plurality of prestressed structures 1A arranged in a straight line, and each of the opposing surfaces of the ends 3b2, 3b1 on the straight line having concave bands that sandwich and hold the ends 3b2, 3b1 from the short direction SH; and a fastener that fixes the opposing surfaces of the pair of holders.

Description

Technical Field

[0001] The present invention relates to a connected prestressed structure.

Background Art

[0002] A prestressed structure using a wooden member is disclosed, which is provided with a joined wooden member that is joined by abutting its longitudinal end face to a member to be joined, the joined wooden member having an insertion hole penetrating in the longitudinal direction, and prestress is introduced in the direction where the joining end face of the joined wooden member and the longitudinal end face of the joined wooden member are pressed against each other by a tension member that is passed through the insertion hole and penetrates the member to be joined, so that the joined wooden member is joined to the member to be joined, wherein the joined wooden member includes a reinforcing pipe member fitted inside the insertion hole, an end of the reinforcing pipe member is exposed at the longitudinal end of the joined wooden member, and the end of the reinforcing pipe member is brought into contact with the member to be joined (see Patent Document 1). Further, there is disclosed a steel bar connecting device provided with a holder that includes a steel bar mounting portion having a concave band disposed in close contact with and covering a steel bar having a convex band on the outer peripheral surface, and a central widened portion formed between the steel bar mounting portions, the two holders being configured to be capable of being combined and fixed with an appropriate fastener (see Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the inventions described in Patent Documents 1 and 2 have a limit in obtaining a long prestressed structure into which required prestress is introduced. This invention has been made in view of the above circumstances, and aims to provide a connected prestressed structure that can obtain a long prestressed structure in which the necessary prestress has been introduced. [Means for solving the problem]

[0005] The connected prestressed structure according to the present invention is as follows: (1) A connected prestressed structure comprising: a plurality of prestressed structures in which prestress is introduced in a direction such that the longitudinal end faces of the wooden members are pressed against each other by tensioning members that penetrate the wooden members in the longitudinal direction and have both ends exposed from the wooden members; a pair of holders that connect the plurality of prestressed structures, with one end of each of the exposed tensioning members of the plurality of prestressed structures arranged in a straight line and each having a concave band on an opposing surface that holds the ends on the straight line by sandwiching them from the short direction; and a fastener that fixes the opposing surfaces of the pair of holders.

[0006] (2) The connected prestressed structure according to (1), wherein each of the plurality of prestressed structures has male threads on the outer surfaces of both ends of the tensioning members exposed from the wood members, and each of the pair of holders has female threads on the inner surface of the concave band that engage with the male threads.

[0007] (3) The connected prestressed structure according to (1) or (2), further comprising a maintenance member disposed between the longitudinal end faces of opposing wooden members when one end of the tensioning member in each of the plurality of prestressed structures is connected in a straight line, and which maintains the introduced prestress. [Effects of the Invention]

[0008] The present invention provides a connected prestressed structure that can be used to obtain a long prestressed structure into which the necessary prestress has been introduced. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a conceptual diagram of the external appearance of a prestressed structure according to this embodiment, where (a) is a conceptual side view, (b) is a conceptual view of one end face of the prestressed structure as seen from the top direction of the paper (direction A) of (a), (c) is a conceptual view of the other end face of the prestressed structure as seen from the bottom direction of the paper (direction B) of (a), and (d) is a conceptual cross-sectional view when (a) is cut along line CC. [Figure 2] Figure 2 is a conceptual cross-sectional view showing a prestressed structure when cut along the DD line in Figures 1(a), (b), and (c). [Figure 3] Figure 3 is an exploded perspective conceptual diagram showing each component of the prestressed structure according to this embodiment, as shown in Figures 1 and 2. [Figure 4] Figure 4 is an external conceptual diagram showing the connected prestressed structure according to this embodiment, where (a) is a vertical conceptual diagram showing the connected prestressed structure 100 in which at least one of the exposed ends 3b1 and 3b2 of the tension member 3 of the prestressed structure 1A shown in Figure 1 is connected in series by a coupler 10 and a maintenance member 200, (b) is an enlarged side vertical conceptual diagram of the vicinity of the coupler 10 of the connected prestressed structure 100 as seen from the right direction (E direction) of the paper in (a) (maintenance member 200 is omitted, a pair of holders 10b, the dotted line inside 10b is a conceptual diagram showing that the bolt 10c1 of the fixing jig 10c described later is located inside), (c) is a cross-sectional conceptual diagram when cut along the FF line of (b), (d) is a cross-sectional conceptual diagram when cut along the FF line of (b) with both ends 3b1 and 3b2 of the tension member 3 omitted from (c), and (e) is an enlarged perspective conceptual diagram of the maintenance member 200. [Figure 5]Figure 5 is an exploded view showing the components of one of the pair of holders 10b in the coupler 10 of Figure 4 (the other holder 10b is the same and therefore omitted), where (a) is a conceptual top view of holder 10b with one end of tension member 3b2, 3b1 arranged in a straight line and the upper surface being the surface that holds the ends 3b2, 3b1 on the straight line from the short side SH, (b) is a conceptual side view of holder 10b as seen from direction 10A of (a), (c) is a conceptual side view of holder 10b as seen from direction 10B of (a), (d) is a conceptual side view of holder 10b as seen from direction 10C of (a), and (e) is holder 10b as seen from direction 10D of (a). (a) is a conceptual side view, (f) is a conceptual view of the bottom surface of the holder 10b as seen from the bottom surface (paper side) of (a), and (g) is a conceptual side view showing a fastener 10c (bolt 10c1, nut 10c2) that is inserted into through holes 10b1 provided in the holder 10b that penetrate from the top surface (a) to the bottom surface (f) (more specifically, through holes 10b1 that connect and penetrate between the bottom surfaces (f) of each of the pair of holders 10b, 10b when one end 3b2, 3b1 of the tensioning member 3 is arranged in a straight line, and the ends 3b2, 3b1 on the straight line are held together by being sandwiched from the short side SH; in this embodiment there are 8) and fixes the opposing surfaces 10a1, 10a1 of the pair of holders 10b, 10b together. [Modes for carrying out the invention]

[0010] A connected prestressed structure according to one embodiment of the present invention will be described with reference to Figures 1 to 4. Note that reference numerals may be omitted if they are the same in all figures. The connected prestressed structure 100 according to this embodiment comprises a plurality of prestressed structures 1A, 1A in which prestress is introduced in a direction in which the longitudinal end faces 2b1, 2b2 of the wooden member 2 are pressed against each other by tension members 3 that penetrate the wooden member 2 in the longitudinal direction Lo and have both ends 3b1, 3b2 exposed from the wooden member 2; a pair of holders 10b, 10b that connect the plurality of prestressed structures 1A, 1A, with one end 3b2, 3b1 of each of the exposed tension members 3, 3 of the plurality of prestressed structures 1A, 1A arranged in a straight line, and each of the opposing surfaces 10a1, 10a1 that sandwich and hold the ends 3b2, 3b1 on the straight line from the short direction SH; and a fixing device 10c that fixes the opposing surfaces 10a1, 10a1 of the pair of holders 10b, 10b together. In other words, the coupler 10 is composed of a pair of holders 10b, 10b and a plurality of fasteners 10c (bolts 10c1, nuts 10c2).

[0011] In this embodiment, the connected prestressed structure 100 connects multiple prestressed structures 1A, 1A with a pair of holders 10b, 10b and fasteners 10c, thereby enabling the creation of a long prestressed structure with the required amount of prestress. Furthermore, the connection of multiple prestressed structures 1A, 1A can be easily carried out at the construction site.

[0012] Preferably, the outer surfaces of both ends 3b1, 3b2 of the tensioning member 3 exposed from the wooden member 2 in each of the plurality of prestressed structures 1A, 1A have male threads 3a, and the inner surfaces of the concave bands 10a, 10a of each of the pair of holders 10b, 10b have female threads 10aa, 10aa that screw into the male threads 3a.

[0013] By making the surfaces of the connecting parts into male and female threads that screw into each other, the force with which the pair of holders 10b, 10b fix the ends 3b1, 3b2 of the tensioning member 3 can be increased. In addition, the durability of each tensioning member 3 against tensile stress in the direction away from the pair of holders 10b, 10b in the longitudinal direction Lo can also be improved.

[0014] Preferably, the present invention further includes a maintenance member 200 which is positioned between the longitudinal end faces 2b1, 2b2 of the opposing wooden members 2 when one end of the tension members 3, 3 in each of the plurality of prestressed structures 1A, 1A is connected in a straight line to each other 3b2, 3b1, and which maintains the introduced prestress.

[0015] After connecting the multiple prestressed structures 1A, 1A with the coupler 10, the prestress introduced into each of the prestressed structures 1A, 1A is partially released (the specific method will be described later). As a result, prestress is introduced in the entire connected prestressed structure 100 from the ends of the tension members 3 of the multiple prestressed structures 1A, 1A that are not connected by the coupler 10 (3b1, 3b2 in Figure 4) in an inward direction facing each other. However, in this case, the longitudinal end faces 2b1, 2b2 of the opposing timber members 2 when the multiple prestressed structures 1A, 1A are connected in a straight line will also be close together, and in this case, there is a risk that the stress of the prestress will decrease.

[0016] Therefore, by further arranging the maintenance member 200 that maintains the introduced prestress between the longitudinal end faces 2b1 and 2b2 of the wood member 2, the decrease in the stress of the prestress is suppressed.

[0017] The pair of holders 10b, 10b and the plurality of fasteners 10c in the coupler 10 are made of steel material. Specifically, the coupler 10 has a rectangular parallelepiped shape, the central region 10bA in the short direction SH of the mutually opposing faces 10a1, 10a1 of the pair of holders 10b, 10b is provided with the recessed strip 10a extending in the longitudinal direction Lo, and the outer peripheral regions 10bB, 10bB on both sides of the central region 10bA in the short direction SH are each provided with a plurality of fasteners 10c (four in each one outer peripheral region 10bB in the present embodiment: 8 in total) that fix the mutually opposing faces 10a1, 10a1 to each other, the fasteners being arranged in the longitudinal direction Lo.

[0018] The retaining member 200 is configured to arrange the exposed end portions 3b1, 3b2 of the tension members, the coupler 10 and the like on the inner side, and has a release portion 200K that partially releases the prestress introduced into each of the prestressed structures 1A, 1A after the plurality of prestressed structures 1A, 1A are connected by the coupler 10.

[0019] Next, the prestressed structure 1A according to the present embodiment will be described in detail. The prestressed structure 1A includes: the wood member 2 extending in the longitudinal direction Lo and having a through-hole 2a penetrating in the longitudinal direction Lo; the tension member 3 extending in the longitudinal direction Lo, which is passed through the through-hole 2a and has both end portions 3b1, 3b2 exposed from the through-hole 2a; the reinforcing pipe member 4 provided between the inner surface of the through-hole 2a and the circumferential surface of the tension member 3 in the short direction SH and extending in the longitudinal direction Lo; a pair of abutment plates 5, 5 through which the exposed tension member 3 penetrates respectively, and which abut against both end faces 2b1, 2b2 of the wood member 2 in the longitudinal direction Lo and both end faces 4b1, 4b2 of the reinforcing pipe member 4 in the longitudinal direction Lo respectively; and a pair of nuts 6, 6 that are fitted from both end faces 3b11, 3b22 of the exposed tension member 3 in the longitudinal direction Lo respectively, and fix the tension member 3 to the pair of abutment plates 5, 5, and has a structure in which prestress is introduced by the one abutment plate 5 and the other abutment plate 5 in the direction where the both end faces 2b1, 2b2 of the wood member 2 in the longitudinal direction are pressed against each other.

[0020] Specifically, the prestressed structure 1A according to this embodiment comprises a wooden member 2, a tensioning member 3, a reinforcing pipe 4, a pair of contact plates 5, 5, and a pair of nuts 6, 6. The wooden member 2 has a through hole 2a that penetrates in the longitudinal direction Lo. The wooden member 2 is made of solid wood or laminated wood, has a longer side in the longitudinal direction Lo, a shorter side in the transverse direction SH, and extends in the longitudinal direction Lo. For example, the wooden member 2 has a through hole 2a with a diameter T1 that penetrates in a straight line toward the longitudinal direction Lo in the center of both end faces 2b1 and 2b2, and both end faces 2b1 and 2b2 are, for example, square (the length of one side L is L1) and are composed of a prism shape with a width of L2 in the longitudinal direction Lo.

[0021] The tensioning member 3 is passed through the through hole 2a, and both ends 3b1 and 3b2 of the tensioning member 3 are exposed from the through hole 2a and extend in the longitudinal direction Lo. The tensioning member 3 has threaded portions 3a, 3a on the circumferential surfaces in the short direction SH of both ends 3b1 and 3b2.

[0022] The tensioning member 3 is, for example, a steel bar (e.g., a PC steel bar) having an outer diameter T3 smaller than the inner diameter T2 of the reinforcing pipe 4 described later, and whose width L4 in the longitudinal direction Lo is longer than the width L2 of the wood member 2 in the longitudinal direction Lo and the width L3 of the reinforcing pipe 4 described later.

[0023] The reinforcing pipe 4 is provided between the inner surface of the through hole 2a and the circumferential surface of the tensioning member 3 in the short direction SH, and extends in the longitudinal direction Lo. The reinforcing pipe 4 is made of, for example, steel and has a cylindrical shape that penetrates in the longitudinal direction Lo. The inner diameter T2 and outer diameter T4 of the cylindrical shape are determined by considering the characteristics of the tensioning member 3 provided on the inner surface and the stress of the introduced prestress.

[0024] The reinforcing pipe 4 has, for example, an inner diameter T2 that is larger than the outer diameter T3 of the tensioning member 3, an outer diameter T4 that is approximately the same as the inner diameter T1 of the through hole 2a of the wooden member 2, and a longitudinal width L3 that is approximately the same as the longitudinal width L2 of the wooden member 2. A grout material is filled between the inner surface of the reinforcing pipe 4 and the circumferential surface of the tensioning member 3 in the short direction SH to prevent rusting of the tensioning member 3.

[0025] The pair of contact plates 5, 5 are each passed through by the tensioning member 3 exposed from the through hole 2a, and they abut against the end faces 2b1, 2b2 of the wooden member 2 in the longitudinal direction Lo and the end faces 4b1, 4b2 of the reinforcing pipe 4 in the longitudinal direction Lo, respectively.

[0026] The pair of contact plates 5, 5 are made of, for example, steel, and the surfaces that contact the end faces 2b1, 2b2 of the wooden member 2 in the longitudinal direction Lo are substantially the same shape as the end faces 2b1, 2b2 of the wooden member 2, for example, squares (with side length L being L1), and have a rectangular plate shape with a width of L5 in the longitudinal direction Lo. Through holes 5a, 5a are provided in the center through which the tensioning member 3 passes, and the inner diameter T5 is substantially the same as the outer diameter T3 of the tensioning member 3.

[0027] In other words, the tensioning member 3 passes through the through-hole 2a of the wooden member 2, as well as through the through-holes 5a, 5a of the pair of abutment plates 5, 5, and is fixed to the pair of abutment plates 5, 5 with a pair of nuts 6, 6, which will be described later. As a result, both ends 3b1, 3b2 are exposed from the pair of nuts 6, 6, respectively, for a length approximately half of the sum of the width L4 of the tensioning member 3 in the longitudinal direction Lo, the width L2 of the wooden member 2 in the longitudinal direction Lo (the width L3 of the reinforcing pipe 4 which is approximately the same), the width L5 × 2 of the pair of abutment plates 5, 5, and the width L6 × 2 of the pair of nuts 6, 6, which will be described later.

[0028] The pair of nuts 6, 6 are fitted into the through holes 2a and 5a, and into the outermost outer edges 3b11 and 3b22 of the ends 3b1 and 3b2 of the tension member 3 exposed from the longitudinal direction Lo of the tension member 3, respectively, thereby fixing the tension member 3 to the pair of contact plates 5, 5. The inner diameter T6 of the pair of nuts 6, 6 is approximately the same as the outer diameter T3 of the tension member 3.

[0029] In one embodiment of the present invention, the prestressed structure 1A, having the above structure, has at least one of the opposing nuts 6, 6 between adjacent prestressed structures 1A, 1A released. Furthermore, prestress is introduced in a direction that causes the entire connected prestressed structure 100 to be pressed against each other by the contact plate 6 at the outermost end of one connected prestressed structure 100 and the contact plate 6 at the outermost end of the other connected prestressed structure 100.

[0030] Furthermore, in the connected prestressed structure 100, the aforementioned maintenance members 200 are provided between the opposing contact plates 5, 5 of each of the adjacent prestressed structures 1A, 1A to maintain the introduced prestress.

[0031] The maintenance member 200 has the exposed ends 3b1, 3b2 of the tensioning member, the coupler 10 and the nuts 6, 6 positioned on the inside, and also has an opening 200K that releases the nuts 6 of at least one of the multiple adjacent prestressed structures 1A, 1A in the connecting prestressed structure 100.

[0032] The maintenance member 200 is composed of, for example, four rectangular steel members 200a, 200b, 200c, and 200d, and can be placed at the four corners forming a 90° angle when the faces of the opposing contact plates 6 between multiple prestressed structures 1A, 1A are square.

[0033] An example of a method for introducing the prestress described above is shown below. A reinforcing pipe 4 is placed in the through hole 2a of the wooden member 2, a tensioning member 3 is placed on the inner surface of the reinforcing pipe 4, grout is filled between the inner surface of the reinforcing pipe 4 and the outer surface of the tensioning member 3, and a pair of contact plates 5, 5 are attached. Before fixing the tensioning member 3 with the pair of contact plates 5, 5 using a pair of nuts 6, 6, both ends 3b1, 3b2 of the tensioning member 3 exposed from the through holes 2a and 5a are pulled toward each other in the longitudinal direction Lo away from the wooden member 2, and while tension is being applied, a pair of nuts 6, 6 are screwed into both end faces 3b11, 3b22, respectively, to fix the tensioning member 3 to the pair of contact plates 5, 5, and then the tension is released.

[0034] As a result, prestress is introduced in a direction in which the end faces 2b1, 2b2 of the wooden member 2 and the end faces 4b1, 4b2 of the reinforcing pipe 4 are pressed against each other by the pair of contact plates 5, 5. As a result, the wooden member 2 receives compressive force from the pair of contact plates 5, 5, and is subjected to compressive force while being sandwiched between the pair of contact plates 5, 5. Similarly, the reinforcing pipe 4 also receives compressive force. [Explanation of Symbols]

[0035] 1A Prestressed structure 2. Wooden members 2a Through hole 2b1, 2b2 end faces 3 Tensors 4 Reinforcement pipe material 5.5 Pair of contact plates 6, 6 pairs of nuts 100 Linked prestressed structures Lo Longitudinal direction SH Short direction

Claims

1. Multiple prestressed structures are formed in which prestress is introduced in a direction in which the longitudinal end faces of the wooden members are pressed against each other by tensioning members that penetrate the wooden members longitudinally and have both ends exposed from the wooden members, The plurality of prestressed structures are arranged in a straight line, with one end of each of the exposed tension members of the plurality of prestressed structures positioned together, and each of the opposing surfaces of the holders is provided with a concave band that clamps and holds the ends of the straight line from the shorter direction, and the plurality of prestressed structures are connected by a pair of holders, A fixing device for fixing the opposing surfaces of the pair of holders together, A connected prestressed structure equipped with [a specific feature].

2. The connected prestressed structure according to claim 1, wherein each of the plurality of prestressed structures has male threads on the outer surfaces of both ends of the tensioning members exposed from the wood members, and each of the pair of holders has female threads on the inner surface of the concave band that engages with the male threads.

3. The connected prestressed structure according to claim 1 or 2, further comprising a maintenance member disposed between the longitudinal end faces of opposing wooden members when one end of the tensioning member in each of the plurality of prestressed structures is connected in a straight line, and which maintains the introduced prestress.

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