Intermediate fixing device and method for assembling the intermediate fixing device

Abstract

To improve efficiency of installation work on existing tensioning materials.SOLUTION: The present invention pertains to an intermediate fixing device for intermediate fixing of an existing tension material and includes at least a pair of first half-divided blocks and a plurality of second half-divided blocks. The paired first half-split blocks comprise: a first connecting portion that can be connected at misaligned positions so that an area overlapping each other in the direction in which the tension material is inserted and an area not overlapping each other are formed; and a second connecting portion that can be connected to the second half-divided block that is provided to cover a half-divided hollow hole exposed in the area not overlapping each other. The second half-divided block has the same structure as the not overlapping area of the first half-divided block, and includes a third connecting portion corresponding to the second connecting portion. Each of the first through third connecting portions includes two bolt holes across the half-divided hollow holes, and each of the half-split blocks facing each other includes the same fastening structure with bolts inserted into the bolt holes and nuts screwed onto the bolts exposed through the bolt holes.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a technology for intermediately anchoring existing tendons such as PC steel bars in the remaining area of ​​a PC (prestressed concrete) structure, excluding the demolition area. [Background technology]

[0002] Intermediate anchors are attached to existing prestressing tendons (tensioned tendons), and are constructed by combining half-shaped blocks. Half-shaped blocks with hollow holes are arranged to sandwich the existing prestressing tendons, and the pair of half-blocks are fastened together with bolts. The existing prestressing tendons are fixed to the intermediate anchors using an intermediate fixing method that uses, for example, filler material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-039141 A Summary of the Invention [Problem to be solved by the invention]

[0004] Because the half blocks that make up the intermediate anchors are made of steel, the longer they are, the heavier they become, making it difficult to install them around existing prestressing steel members. Therefore, Patent Document 1 proposes dividing the half blocks that make up the anchoring block into multiple small blocks to reduce the weight of the individual components that make up the anchoring block.

[0005] However, in Patent Document 1, one half block and the other half block of a pair have different structures, which results in a problem of a large number of parts. In other words, even if the block is divided into small blocks, two patterns must be prepared as separate members: a block with a bolt hole through which the bolt is inserted, and a block with a bolt hole into which the tip of the bolt is screwed.

[0006] Therefore, during installation work, it is necessary to assemble the blocks around the existing prestressing steel members while checking whether the block is one into which the bolt will be inserted or one into which the tip of the bolt will be screwed, making it difficult to improve work efficiency. In other words, when assembling the blocks, it is necessary to take into account the direction in which the bolts will be fastened, which reduces work efficiency.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an intermediate fixing device that can improve the efficiency of installation work on an existing tendon to which tension is applied. [Means for solving the problem]

[0008] (1) The present invention provides an intermediate anchoring device for intermediately anchoring an existing tendon to which tension is applied by connecting multiple half blocks to each other and forming a hollow hole through which the existing tendon passes. The intermediate anchoring device includes at least a pair of first half blocks and multiple second half blocks. The pair of first half blocks has a first connecting portion that can be connected to the second half blocks at positions offset in the insertion direction of the tendon so as to form overlapping and non-overlapping areas in the insertion direction of the tendon, and a second connecting portion that can be connected to the second half block, which is provided to cover the half-shaped hollow hole exposed in the non-overlapping area.

[0009] The second half block is a half block that has the same structure as the non-overlapping region of the first half block and includes a third connecting portion that corresponds to the second connecting portion. The first connecting portion, second connecting portion, and third connecting portion each have two bolt holes on either side of a half-shaped hollow hole, and the opposing half blocks are configured to have the same fastening structure with a bolt inserted into the bolt hole and a nut that screws onto the bolt exposed from the bolt hole.

[0010] (2) In the above (1), each of the first half block and the second half block has a convex portion formed on one end face in the direction in which the tendon is inserted, and a concave portion formed on the other end face, and the two adjacent half blocks are configured so that they are positioned in a plane perpendicular to the direction in which the tendon is inserted by engagement of the convex portion and the concave portion.

[0011] (3) In the above (2), the convex portion can be formed by extending the inner peripheral surface of the half-split hollow hole, and the concave portion can be formed by recessing the inner peripheral surface of the half-split hollow hole outward in the circumferential direction. The convex portion can be configured so that one adjacent convex portion engages with the other concave portion in the circumferential direction of the half-split hollow hole.

[0012] (4) In the above (1) to (3), the fastening structure is configured to have a recess in which the bolt holes are exposed and which can accommodate either the top of a bolt inserted into the bolt holes or a nut that is screwed onto the threaded portion of a bolt exposed from one of the bolt holes. In this case, the recess can be configured to open outward in the direction in which the two bolt holes are aligned with the half-split hollow hole in between.

[0013] (5) The present invention is a method for assembling an intermediate anchoring device for intermediately anchoring a tensioning member by connecting multiple half blocks together to form a hollow hole through which an existing tensioning member to which tension is applied is inserted. The multiple half blocks include at least a pair of first half blocks and multiple second half blocks.

[0014] In the method for assembling the intermediate fixing device, a pair of first half blocks are connected at a first connecting portion while being shifted in the direction in which the tendon is inserted so that overlapping and non-overlapping areas are formed in the direction in which the tendon is inserted, and a second half block is connected to the second connecting portion of the first half block so as to cover the half-shaped hollow hole exposed in the non-overlapping area of ​​the first half block.

[0015] The second half block has the same structure as the non-overlapping area of ​​the first half block and is a half block equipped with a third connecting portion corresponding to the second connecting portion. The first connecting portion, second connecting portion, and third connecting portion each have two bolt holes on either side of a half-shaped hollow hole, and each of the opposing half blocks has the same fastening structure with a bolt inserted into the bolt hole and a nut threaded onto the bolt exposed from the bolt hole. [Effects of the Invention]

[0016] According to the present invention, the connections between paired first half blocks and the connections between the first half block and the second half block have the same fastening structure, so the assembly of each half block to the existing tendons can be done without worrying about the direction of bolt fastening, thereby improving work efficiency and reducing work costs. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic explanatory diagram of a bridge to which an intermediate fixing device of a first embodiment is applied; [Figure 2] 1A and 1B are a perspective view and a diagram showing the intermediate fixing device formed by combining respective separate units (half blocks) of the intermediate fixing device according to the first embodiment; [Figure 3] FIG. 2 is a view showing the intermediate fixing device of the first embodiment as viewed in the longitudinal direction. [Figure 4] 5A to 5C are diagrams illustrating a method for assembling the intermediate fixing device according to the first embodiment. [Figure 5] FIG. 2 is a side view of the intermediate fixing device according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing a first modified example of the separate unit constituting the intermediate fixing device of the first embodiment. [Figure 7] 7 is a side view of the intermediate fixing device of the first modified example shown in FIG. 6. FIG. [Figure 8] FIG. 10 is a diagram showing a second modified example of the separator unit constituting the intermediate fixing device of the first embodiment. [Figure 9]FIG. 10 is a diagram showing an intermediate fixing device according to a second embodiment. [Figure 10] FIG. 10 is a side view of an intermediate fixing device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments will be described with reference to the drawings.

[0019] (First embodiment) 1 to 8 are diagrams illustrating a first embodiment. Fig. 1 is a schematic explanatory diagram of a bridge to which the intermediate fixing device 100 of this embodiment is applied. Note that although a bridge is used as an example, the intermediate fixing device 100 of this embodiment can be applied to intermediate fixing of various PC structures other than bridges.

[0020] As shown in Figure 1, at the boundary between the demolition area and the remaining area of ​​the PC structure, the prestressing tendons to which tension has been applied are pulled out, and a steel intermediate anchoring device 100 is attached to the pulled-out tendons. Expansion material is injected into the attached intermediate anchoring device 100, and the prestressing tendons are fixed in place by the expansion force. After fixing, concrete is backfilled and the PC tendons are cut in the area behind the intermediate anchoring device 100. This allows partial demolition of the PC structure without affecting the prestress in the remaining area.

[0021] In addition to the intermediate fixing method using the expansion material, a wedge fixing method can also be applied. Also, although the injection holes for the expansion material and the air vent holes are not specifically shown in the drawings, they can be formed at any position in the hollow hole 1 of the intermediate fixing device 100.

[0022] The intermediate anchoring device 100 of this embodiment is composed of multiple half blocks and is attached to existing prestressing tendons so as to form hollow holes 1 through which the prestressing tendons pass. The length of the intermediate anchoring device 100 in the direction in which the prestressing tendons pass can be varied depending on the number of connected half blocks. The length of the intermediate anchoring device 100, in other words, the number of connected half blocks, can be set as desired depending on the tension applied to the prestressing tendons.

[0023] FIG. 2 is a perspective view of the intermediate fixing device 100 and a diagram showing the intermediate fixing device 100 formed by combining half blocks (separate units).

[0024] The intermediate fixing device 100 uses two types of half blocks: a first half block 110 and a second half block 120. In this embodiment, separate unit units (block units) are set, and the second half block 120 is configured as the smallest separate unit.

[0025] Specifically, the second half block 120 has a half-shaped hollow hole 121, with flanges 122 extending on both sides of the hollow hole 121. Each flange 122 has a bolt hole 123 formed in the thickness direction (Z direction) of the flange 122. A half block having a pair of bolt holes 123, 123 formed on either side of the half-shaped hollow hole 121 in this way becomes the smallest separator unit.

[0026] The first half block 110 is configured to include at least two or more minimum separate units. In this embodiment, the first half block 110 is a half block having a size in which two second half blocks 120 are arranged in the X direction. Each flange 112 has a bolt hole 113 formed in the thickness direction (Z direction) of the flange 112.

[0027] Specifically, the first half block 110 has a half-shaped hollow hole 111, with flanges 112 extending on both sides of the hollow hole 111. The hollow hole 111 and flanges 112 are twice as long as those of the second half block. Correspondingly, two pairs of bolt holes 113, 113 are formed side by side in the X direction, with the half-shaped hollow hole 111 sandwiched between them.

[0028] In this manner, the first half block 110 and the second half block 120 of this embodiment have the same structure (same shape) for each component such as the half-shaped hollow holes, flanges, and bolt holes, and the first half block 110 can be made up of at least two separate unit units, and the second half block 120 can be made up of at least one separate unit unit. The smallest combination of separate unit units of the first half block 110 and the second half block 120 is the first half block 110 made up of two separate unit units and the second half block 120 made up of one separate unit unit as shown in the present embodiment.

[0029] The intermediate fixing device 100 uses at least one pair of first half blocks 110. The pair of first half blocks 110 are connected at offset positions in the X direction so that they have overlapping and non-overlapping areas in the X direction along which the prestressing steel is inserted. In this case, bolt holes 113 for connecting the blocks in an offset state serve as first connecting portions.

[0030] 2, first half blocks 110A and 110B are paired, and first half blocks 110C and 110D are paired. Looking at it from another perspective, first half blocks 110B and first half blocks 110C are paired.

[0031] Bolt hole 113b of first half block 110A is aligned with bolt hole 113a of first half block 110B, and bolt B is inserted and fastened with nut N. Therefore, the first connecting portion for connecting the two blocks in a misaligned state is bolt hole 113b in first half block 110A, and bolt hole 113a in first half block 110B.

[0032] On the other hand, if they are joined in a misaligned state, a non-overlapping area will be created. The second half block 120 is provided to cover the half-shaped hollow hole 111 exposed in this non-overlapping area. In this case, the bolt hole 113a of the first half block 110A that joins with the second half block 120 becomes the second connecting part.

[0033] The second half block 120 is provided in a region of the non-overlapping region that is located at an end of the intermediate fixing device 100 in the longitudinal direction (X direction). For example, as shown in Fig. 2, the first half block 110B is connected to the first half block 110C in a region that does not overlap with the first half block 110A, and the first half block 110C is connected to the first half block 110D. In this case, the second half block 120 is disposed in each of the non-overlapping regions of the first half block 110A and the first half block 110D that are located at both ends of the intermediate fixing device 100.

[0034] The second half block 120 has the same structure as the non-overlapping region of the first half block 110, and is provided with a bolt hole 123 as a third connecting portion corresponding to the second connecting portion.

[0035] The first half blocks 110 are fastened to each other, and the first half blocks and second half blocks 120 are fastened to each other using the same fastening structure, which uses bolts B inserted through bolt holes 113, 123 and nuts N threaded onto the bolts B exposed from the bolt holes 113, 123.

[0036] The fastening structure of this embodiment has recesses 114, 124 in which the bolt holes 113, 123 are exposed and capable of accommodating either the top of the bolt B inserted into the bolt holes 113, 123 or a nut N that screws onto the threaded portion of the bolt B exposed from one of the bolt holes 113, 123. That is, in each half block 110, 120, the area around the bolt hole 113, 123 is recessed in the thickness direction of the flanges 112, 122, and the bolt hole 113, 123 is formed in the recessed area.

[0037] Furthermore, recess 114 opens outward in the direction in which bolt holes 113 are lined up across half-shaped hollow hole 111 (Y direction), and nuts N can be inserted into recess 114 not from the insertion direction of bolt hole 113 (Z direction) but from the same plane as the opening surface of bolt hole 113 (Y direction) to position it relative to bolt hole 113. The same is true for recess 124 of second half block 120, which opens outward in the direction in which bolt holes 123 are lined up across half-shaped hollow hole 121 (Y direction), and nuts N can be inserted into recess 124 from the same plane as the opening surface of bolt hole 123 (Y direction) to position it relative to bolt hole 123.

[0038] 2 shows an example of intermediate fixing device 100 using two pairs of first half blocks 110 and two second half blocks 120, but the minimum configuration of intermediate fixing device 100 of this embodiment is one pair of first half blocks 110 and two second half blocks 120. In other words, a second pair of first half blocks 110C is provided in the non-overlapping area of ​​a first pair of first half blocks 110A, 100B so as to cover hollow hole 111, and multiple pairs of first half blocks 110 fastened together in a shifted state are lined up and connected to each other, thereby making it possible to form an intermediate fixing device 100 of any length.

[0039] 3 is a view of the intermediate fixing device 100 as seen in the X direction. When the half-holes 111 or the half-holes 111 and 121 are assembled facing each other, a cylindrical hollow hole 1 is formed. Then, the half-blocks facing each other are connected with bolts B and nuts N sandwiching the hollow hole 1 therebetween.

[0040] 4 is a diagram illustrating a method for assembling the intermediate fixing device 100 of this embodiment. The first half block 110 and the second half block 120 are attached so as to surround the existing prestressing steel strands, and bolts B are inserted through the bolt holes 113, 123 and the bolt holes 113, 113 of the opposing half blocks, respectively. Nuts N are then screwed onto the threads of the bolts B exposed from the other bolt hole to fasten them together. Because the fastening structure of each half block 110, 120 is the same, the bolt B can be inserted into the bolt hole regardless of the insertion direction of the bolt B. In other words, the half blocks 110, 120 can be attached to the existing prestressing steel strands from either half block 110, 120 side.

[0041] In this embodiment, at least a pair of first half blocks 110 are used, and they are fastened together with bolts B and nuts N so as to form overlapping and non-overlapping areas, and the second half block 120 is fastened to the first half block 110 so as to cover the non-overlapping areas. With this configuration, even if the intermediate fixing device 100 is made into separate units, the half blocks 110, 120 will not come off in the X direction, and the strength of the fixing device can be appropriately exerted. Furthermore, since there is no need to use a restraining member, the number of parts can be reduced.

[0042] 5 is a side view of intermediate fixing device 100. Half-split hollow holes 111, 121 form hollow hole 1 extending in the X direction, and recesses 114, 124 around bolt holes 113, 123 provided in each half block 110, 120 are sized to accommodate both the top of bolt B and nut N. Furthermore, because recesses 114, 124 open to the outside, the visibility of bolt holes 113, 123 is improved when inserting bolt B through bolt hole 113, 123, improving work efficiency, and nut N can be inserted (positioned) horizontally relative to the opening of bolt hole 113, 123, improving workability.

[0043] Here, in this embodiment, the first half block 110 and the second half block 120 have engaging protrusions 115, 125 formed on one end face in the X direction through which the PC steel is inserted, and engaging recesses 116, 126 formed on the other end face. The two adjacent half blocks 110, 120 are positioned in a plane perpendicular to the X direction by engagement between the engaging protrusions 115, 125 and the engaging recesses 116, 126.

[0044] Specifically, the engaging protrusions 115, 125 are formed by extending the inner circumferential surfaces of the half-shaped hollow holes 111, 121. On the other hand, the engaging recesses 116, 126 are formed by recessing the inner circumferential surfaces of the half-shaped hollow holes 111, 121 outward in the circumferential direction. One of the adjacent arc-shaped engaging protrusions 115, 126 engages with the other arc-shaped engaging recess 116, 126 in the circumferential direction of the half-shaped hollow holes 111, 121. In other words, the engaging recesses 116, 126 are engaging grooves recessed outward in the inner circumferential surfaces of the hollow holes 111, 121, and the engaging protrusions 115, 125 are engaging protrusions that protrude outward from the ends of the hollow holes 111, 121 and are formed to a predetermined thickness (approximately the same thickness as the depth of the engaging grooves) toward the outside of the inner circumferential surfaces of the hollow holes 111, 121.

[0045] 4 and 5, the engaging ends of the engaging protrusions 125 and the engaging recesses 116 are offset in the X direction from the position of the end faces where the second half block 120 and the first half block 110 abut, and overlap each other. This allows the two adjacent half blocks 110, 120 to be positioned in a plane (YZ plane) perpendicular to the X direction, improving work efficiency. The same is true for the two adjacent half blocks 110, where the engaging ends of the engaging protrusions 115 and the engaging recesses 116 are offset in the X direction and overlap each other. Note that, because the engaging ends of the engaging protrusions 125 and the engaging recesses 116 overlap each other while being offset in the X direction, the expansion material injected into the hollow hole 1 is less likely to leak out.

[0046] The intermediate fixing device 100 of this embodiment is composed of a first half block 110 and a second half block 120 formed as separate units of the same structure, and the connection between the paired first half blocks 110 and the connection between the first half block 110 and the second half block 120 have the same fastening structure. Therefore, the assembly work of the half blocks 110, 120 to the existing prestressing steel can be performed without worrying about the direction of bolt fastening. This improves work efficiency and reduces work costs.

[0047] Fig. 6 is a diagram showing a first modified example of the half block constituting the intermediate fixing device 100 of this embodiment. Fig. 7 is a diagram showing a side view of the intermediate fixing device 100 of the first modified example shown in Fig. 6.

[0048] In the intermediate fixing device 100 of the first modification, the engaging projections 115a and 125a are formed as projections extending from a portion of one end face in the X direction, i.e., one end face of the flanges 112 and 122, respectively, and the engaging recesses 116a and 126a are formed as recesses extending from a portion of the other end face in the X direction, i.e., the other end face of the flanges 112 and 122, respectively.

[0049] 6, the engaging concave-convex structure of the first modified example is configured to engage with each other in a direction perpendicular to the X direction (Z direction) and not allow adjacent half blocks to separate in the X direction while engaged. For example, the engaging convex portions 115a, 125a are formed in an inversely tapered trapezoidal shape that widens in the Y direction, and the engaging concave portions 116a, 126a are formed as grooves that can be fitted into these trapezoids from a direction perpendicular to the X direction. This enables positioning and restricts movement in the XY plane when engaged, improving the efficiency of the installation work.

[0050] FIG. 8 is a diagram showing a second modified example of the half block constituting the intermediate fixing device 100 of this embodiment.

[0051] 8, the engagement protrusions 115b, 125b are formed by forming a protruding portion on one end surface of the flanges 112, 122 in the X direction, and the engagement recesses 116b, 126b are formed by forming a recessed portion on the other end surface of the flanges 112, 122 in the X direction. One of the adjacent engagement protrusions 115b, 125b engages with the other engagement recess 116b, 126b in the X direction. In the second modification as well, positioning can be easily performed, improving work efficiency.

[0052] In the first half block 110 and the second half block 120 of the second modified example shown in Fig. 8, recesses 114a, 124a are formed around the bolt holes 113, 123, but are not open to the outside. In this way, the recesses 114a, 124a may be configured to surround the entire periphery of the bolt holes 113, 123. For example, the half blocks shown in this embodiment and the first modified example may also be configured so that some of the recesses 114, 124 are not open to the outside. Conversely, in the second modified example shown in Fig. 8, some of the recesses 114, 124 may also be open to the outside.

[0053] (Second embodiment) 9 and 10 are diagrams for explaining the second embodiment. Fig. 9 is a diagram showing an intermediate fixing device 100A of this embodiment. Fig. 10 is a diagram showing a side view of the intermediate fixing device 100A of this embodiment.

[0054] This embodiment is an intermediate fixing device 100A that is configured with a first half block 110 and a second half block 120 that have the concave-convex engaging structure (reverse tapered engaging structure) of the first modified example shown in FIGS.

[0055] The intermediate fixing device 100A of this embodiment can be configured only by a second half block 1200, which corresponds to the second half block 120 of the first embodiment. Note that, since the other configurations are the same as those of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

[0056] 9 and 10, the intermediate fixing device 100A is formed by connecting multiple pairs of second half blocks 1200 around the periphery of existing prestressing steel. The second half block 1200 has an engaging protrusion 125a extending in a convex shape from a portion of one end face in the X direction, i.e., one end face of the flange 122, and an engaging recess 126a formed in a concave shape from a portion of the other end face in the X direction, i.e., the other end face of the flange 122.

[0057] The engaging concave-convex structure of this embodiment is configured to engage with each other in a direction perpendicular to the X direction (Z direction) and not allow adjacent second half blocks 1200 to separate in the X direction while engaged, and the engaging convex portion 125a of one adjacent second half block 1200 and the engaging concave portion 126a of the other second half block 1200 are formed in a trapezoidal shape that widens in an inverse tapered manner in the Y direction, and the engaging concave portion 126a is formed as a groove into which the engaging convex portion 125a can be fitted from a direction perpendicular to the X direction. This not only enables positioning, but also restricts movement in the XY plane in the engaged state, firmly connecting adjacent second half blocks 1200 in the X direction.

[0058] The intermediate fixing device 100A of this embodiment can be configured as an intermediate fixing device in which multiple half blocks (second half blocks) 1200 are connected to each other and a hollow hole 1 is formed through which an existing tension material into which tension force has been introduced is inserted, thereby intermediately fixing the tension material. A plurality of half blocks 1200 are arranged side by side in the direction in which the tendon is inserted (X direction), and are fastened together facing each other with the tendon sandwiched therebetween so that the hollow hole 1 is formed. The half block (second half block 1200) has an engaging protrusion 125a formed on one end face in the direction in which the tension material is inserted, and an engaging recess 126a formed on the other end face, and the two adjacent half blocks 1200 are positioned in a plane perpendicular to the direction in which the tension material is inserted by the engagement of the engaging protrusion 125a and the recess 126a, and the engaging protrusion 125a of one adjacent half block 1200 and the engaging recess 126a of the other half block 1200 engage with each other in a direction perpendicular to the direction in which the tension material is inserted, and are configured to have an engaging structure (reverse tapered concave-convex engaging structure) that does not allow the adjacent half blocks 1200 to separate in the direction in which the tension material is inserted when engaged.

[0059] While the intermediate fixing device of the present invention has been described above using an embodiment as an example, the separator unit units of the first half block 110 and the second half block 120 can be changed as desired. For example, the first half block 110 may be large enough to include three second half blocks 120. In this case, the pair of first half blocks are connected to each other in a shifted state by one or two first connecting portions, and the second half blocks fixed in the non-overlapping area are half blocks each one or two separator unit sizes.

[0060] In other words, the separate unit units of the first half blocks 110 and the second half blocks 120 can be changed as desired, as long as the paired first half blocks are connected to each other with a shift by a separate unit unit, and second half blocks each having a size equal to the shifted separate unit unit are connected to non-overlapping areas located at both ends of the intermediate fixing device 100. However, since the weight per half block increases as the number of separate unit units included in a half block increases, in consideration of the efficiency of transportation to the installation site and the efficiency of work at the installation site, an intermediate fixing device 100 configured with the minimum separate unit units described above is the best embodiment, but even if the intermediate fixing device 100 is not configured with the minimum separate unit units, it is within the scope of the present invention and the above-mentioned technical effects can be obtained. [Explanation of symbols]

[0061] 100,100A Intermediate fixing device 1 hollow hole 110 First half block 120 Second half block 111,112 Half-split hollow hole 112,122 flange 113,123 Bolt holes 114,124 Recess (fastening recess) 115,125 Engagement protrusion 116,126 Engagement recess

Claims

1. An intermediate fixing device in which a plurality of half blocks are connected to each other, a hollow hole is formed through which an existing tendon into which tension is introduced is inserted, and the existing tendon is intermediately fixed, at least one pair of first half blocks and a plurality of second half blocks; The pair of first half blocks is a first connection portion that can be connected at a position shifted in the insertion direction of the tendon so that an overlapping region and a non-overlapping region are formed in the insertion direction of the tendon; a second connecting portion connectable to the second half block and provided to cover the half-shaped hollow hole exposed in the non-overlapping region; the second half block is a half block having the same structure as the non-overlapping region of the first half block and including a third connecting portion corresponding to the second connecting portion; The first connecting portion, the second connecting portion, and the third connecting portion each have two bolt holes sandwiching a half-shaped hollow hole, and each of the opposing half blocks has the same fastening structure using a bolt inserted into the bolt hole and a nut screwed onto the bolt exposed from the bolt hole, Each of the first half block and the second half block comprises: An intermediate fixing device characterized in that a convex portion is formed by extending the inner surface of the half-shaped hollow hole on one end face in the direction in which the tension member is inserted, and a concave portion is formed by recessing the inner surface of the half-shaped hollow hole radially outward on the other end face, and one adjacent convex portion engages with the other concave portion in the radial direction of the half-shaped hollow hole, thereby positioning the two adjacent half-shaped blocks in a plane perpendicular to the direction in which the tension member is inserted.

2. the fastening structure includes an accommodating recess in which the bolt hole is exposed and in which the nut that screws onto the top of the bolt inserted into the bolt hole or the threaded portion of the bolt exposed from one of the bolt holes can be accommodated; 2. The intermediate fixing device according to claim 1, wherein the accommodation recess is open to the outside in a direction in which the two bolt holes are aligned with the half-split hollow hole therebetween.

3. A method for assembling an intermediate fixing device for intermediately fixing an existing tendon to which tension is applied by connecting a plurality of half blocks to each other to form a hollow hole through which the existing tendon to which tension is applied is inserted, the method comprising: The plurality of half blocks includes at least a pair of first half blocks and a plurality of second half blocks, the pair of first half blocks are connected at a first connection portion in a state where the first half blocks are shifted in the insertion direction of the tendon so that an overlapping region and a non-overlapping region are formed in the insertion direction of the tendon; The second half block is connected to the second connecting portion of the first half block so as to cover a half-shaped hollow hole exposed in the non-overlapping region of the first half block; the second half block is a half block having the same structure as the non-overlapping region of the first half block and including a third connecting portion corresponding to the second connecting portion; The first connecting portion, the second connecting portion, and the third connecting portion each have two bolt holes sandwiching a half-shaped hollow hole, and each of the opposing half blocks has the same fastening structure using a bolt inserted into the bolt hole and a nut screwed onto the bolt exposed from the bolt hole, Each of the first half block and the second half block comprises: a convex portion is formed by extending the inner circumferential surface of the half-shaped hollow hole on one end face in the direction in which the tension member is inserted, and a concave portion is formed by recessing the inner circumferential surface of the half-shaped hollow hole radially outward on the other end face, and one adjacent convex portion engages with the other adjacent concave portion in the radial direction of the half-shaped hollow hole, thereby positioning the two adjacent half-shaped blocks in a plane perpendicular to the direction in which the tension member is inserted.

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