KR101299963B1 - Constructing Method of Multi-Strand Cable in Bridge - Google Patents

Abstract

The present invention relates to a method for laying a multi-stranded cable in a cable support bridge, such as a cable-stayed bridge.
In the present invention, the strand 102 is arranged in the outer shell pipe 101 by repeating the reciprocating operation of the glider 200, but the horizontal row of the plurality of horizontal rows of the strands in the outer layer 101 from the upper layer to the lower layer direction. Stacking sequentially and tensioning the strands of each horizontal row with a design tension; Lay out horizontally arranged horizontally from the lower layer to the upper layer in the jacket pipe 101, while reducing the width and thickness of the glider 200 in accordance with the remaining space in the jacket pipe to perform the reciprocating operation of the glider 200 Performing, and partially tensioning the horizontal rows of strands stacked from the lower layer to the upper layer so that a tension force having a pressure of 30 to 80 bar is introduced; And after the strands are all filled in the outer sheath pipe 101, further tensioning the strands which have been sequentially stacked and partially tensioned from the lower layer so as to have a design tension in sequence. Way. This is provided.

Description

 Constructing Method of Multi-Strand Cable in Bridge

The present invention relates to a method for installing a compact multi-strand cable supporting a superstructure of a bridge in a cable bridge, such as a cable-stayed bridge, and specifically, by efficiently arranging and converging strands in an envelope pipe having a narrow inner space. The present invention relates to a method for installing a compact multi-strand cable in which the diameter of the outer pipe is greatly reduced than that of a conventional multi-strand cable.

Multi-strand cables that support bridge decks in cable bridges, such as cable-stayed bridges, are typically tensioned by a plurality of strands in a sheathed pipe made of steel or synthetic material such as aluminum, such as HDPE. Has a configuration arranged in a state. An example of such a multi-strand cable is disclosed in Korean Patent Publication No. 10-2008-93004.

FIG. 1 shows a schematic cross sectional view of a conventional multi-strand cable 1 with 55 strands 102 arranged in a sheath pipe 101, and FIG. 2 shows a glider to make the state shown in FIG. 1. A schematic perspective view is shown showing a state in which each strand 102 is individually penetrated into the sheath pipe 101 using a glider 200.

In order to arrange the plurality of strands 102 in the outer pipe 101, a member called a glider 200 is conventionally used. That is, one strand 102 is connected to the glider 200, and as shown in FIG. 2, the glider 200 passes through the inside of the outer pipe 101 to allow the strand connected to the glider 200 ( The operation of allowing 102 to be placed in the sheath pipe 101 was repeated, so that all 55 strands 102 were sequentially placed in the sheath pipe 101. When all the strands 102 are disposed in the outer sheath pipe 101, the strands 102 are individually tensioned, and as shown in FIG. 1, 55 strands 102 are bundled to be focused in a hexagonal cross-sectional shape. In addition, the sheath pipe 101 is pulled toward the anchoring end of the strand 102 so that the strand 102 is located in the sheath pipe 101 in the longitudinal direction of the focused strands 102.

In the conventional multi-strand cable having such a configuration, since the jacket pipe 101 having a large diameter is used, it is easy to secure sufficient space for the glider 200 to pass through the jacket pipe 101. Therefore, even when the strands 102 disposed in the outer shell pipe 101 are not arranged in a hexagonal cross-sectional shape in an unstrained state, the strands 102 are easily found in place when the strands 102 are tensioned. It could be focused in the shape of a square cross section. By the way, the larger the diameter of the outer pipe 101 as in the prior art can easily pass through the glider 200, the arrangement and tension of the strand 102 is easy, but on the contrary causes a problem that the wind load on the bridge increases. In other words, the larger the diameter of the outer pipe 101 constituting the multi-strand cable, the larger the area to receive wind power, the greater the wind load transmitted by the multi-strand cable. As the wind load transmitted by the multi-strand cable increases, the strength required for the portion where the multi-strand cable is connected to the pylon or the bottom plate of the bridge also increases, which is very disadvantageous in terms of the structural aspect of the entire bridge. do. Therefore, if the same number of strands 102 are arranged in the jacket pipe 101, it is desirable to reduce the diameter of the jacket pipe 101 as much as possible.

FIG. 3 is a schematic cross-sectional view of a "compact multi-strand cable" in which the sheath pipe 101 is made small so that the strand 102 is filled and arranged in a dense form inside the sheath pipe 101. have. 1 and 3, the compact multi-strand cable shown in FIG. 3 is a sheath pipe 101 compared to the conventional multi-strand cable shown in FIG. 1 with the same number of strands 102 focused. The outer diameter of is small. Therefore, in the compact multi-strand cable shown in FIG. 3, the cross-sectional area of the outer sheath pipe 101 subjected to wind power is also relatively smaller than that of FIG. 1, so that the wind load transmitted by the multi-strand cable is also lower than that of FIG. 1. It can be made smaller, resulting in structural advantages of the entire bridge, such as by reducing the strength required for the part where the multi-stranded cable is connected to the bridge's pylon or bottom plate.

However, since the conventional multi-strand cable shown in FIG. 1 has a sheath pipe 101 having a large outer diameter, a large empty space 105 between the multi-strand and the sheath pipe 101 focused therein is provided. Although present, the compact multi-strand cable uses a sheath pipe 101 having a small outer diameter for the same number and the same multi-strand, as shown in FIG. 3, so that the void between the strand and the sheath pipe 101 The space becomes significantly narrower than in the case of FIG. For this reason, without considering the arrangement order of the strands 102, the size of the glider 200, and the like, the glider 200 is repeatedly passed through the large diameter jacket pipe 101 as shown in FIG. It is not possible to construct a compact multi-strand cable having a small diameter jacket pipe 101 as shown in FIG. Therefore, in order to construct such a compact multi-stranded cable, a new method different from the conventional method must be derived.

Domestic Patent Publication No. 10-2008-93004 (Domestic Patent Application No. 10-2008-33270) (Published October 17, 208)

The present invention was developed to overcome the limitations of the prior art as described above, and specifically, to provide a method for manufacturing a compact multi-strand cable in which the diameter of the outer pipe is significantly reduced than that of the conventional multi-strand cable. It is done.

In order to achieve the above object, in the present invention, a plurality of strands are arranged in a tensioned and focused state in the outer pipe in the cable support bridge, a plurality of strands are arranged side by side in the same horizontal position to form a horizontal row And a method of installing a multi-strand cable having a form in which the horizontal rows are stacked from the top to the bottom thereof, wherein the glider connecting the strands passes through the reciprocating operation of the glider through the inside of the sheath pipe. Strands are arranged in the inner pipe pipe, and the horizontal rows of the strands are sequentially stacked from the first horizontal row to the second horizontal row or the first horizontal row to the third horizontal row in the direction from the upper layer to the lower layer in the outer pipe. Tensioning the strand with design tension; Repeat the glider's reciprocating operation and lay out horizontal rows sequentially from the lower layer to the upper layer in the outer pipe, but the width of the glider in accordance with the gap between the horizontal rows already installed on the upper layer and the horizontal rows sequentially stacked from the lower layer. Performing a reciprocating operation of the glider while reducing the thickness, and partially tensioning each horizontal row of strands sequentially stacked from the lower layer to the upper layer so that a tension force having a pressure of 30 to 80 bar is introduced; And after the strands are all filled in the outer pipe, further tensioning the sequentially stacked and partially tensioned strands sequentially from the lower layer to have design tension in the compact multi-strand cable at the cable support bridge. Hypothesis methods are provided.

In the present invention as described above, when the strands in the horizontal column from the first horizontal column to the second horizontal column or the first horizontal column to the third horizontal column to tension each strand with the design tension force, It is desirable to tension the strands in an inward order in the order of starting the tension and alternating from the left and right sides. Furthermore, after all the strands are filled inside the outer pipe, the strands which are sequentially stacked and partially tensioned from the lower layer are sequentially When the additional tension to have a design tension force, it is preferable to start the tension from the strands located on the outside of each horizontal row to tension the strands in an inward order in the order of alternation from the left and right sides.

According to the present invention, it is possible to produce a compact multi-strand cable in which the diameter of the outer pipe is significantly reduced compared to the conventional one, and thus the wind load transmitted by the multi-strand cable, and thus the main tower or the bottom plate of the bridge and It is possible to enjoy the effect of reducing the required strength and the like for the portion to which the multi-strand cable is connected, thereby making it possible to construct a bridge in a structurally more advantageous state.

1 is a schematic cross-sectional view of a conventional multi-strand cable.
FIG. 2 is a schematic perspective view showing a state in which a strand is penetrated through the shell pipe using a glider according to a conventional method for manufacturing the conventional multi-strand cable shown in FIG. 1.
3 is a schematic cross-sectional view of a compact multi-strand cable according to the present invention in which strands are densely packed in small diameter sheath pipes.
4 is a schematic cross-sectional view of a state in which a first horizontal row of strands is arranged in a shell pipe according to the method of the present invention.
FIG. 5 is a schematic cross-sectional view of a state in which a second horizontal row of strands is arranged in a shell pipe in accordance with the method of the present invention subsequent to FIG. 4.
FIG. 6 is a schematic cross-sectional view for describing the tension order of strands in FIG. 5.
FIG. 7 is a schematic perspective view of the glider used in the steps shown in FIG. 5.
FIG. 8 is a schematic cross-sectional view illustrating three horizontal rows stacked from the bottom of the shell pipe subsequent to the state shown in FIG. 5.
9 is a schematic partial cross-sectional view for explaining an adverse phenomenon that occurs when the horizontal rows of strands are stacked in a state of no tension.
FIG. 10 is a schematic cross-sectional view of a state in which the sixth horizontal row and the fifth horizontal row are disposed subsequent to the state shown in FIG. 8.
FIG. 11 is a schematic perspective view of the glider used in the state of FIG. 10. FIG.
FIG. 12 is a schematic cross-sectional view illustrating a state in which a glider passes at intervals of one last horizontal column following the state of FIG. 10.
FIG. 13 is a schematic perspective view of the glider used in the state of FIG. 12. FIG.
FIG. 14 is a schematic cross-sectional view showing a state in which the glider passes to position the last strand in the last horizontal row following the state of FIG. 12.
15 is a schematic perspective view of the glider used at this time.
16 is a schematic cross-sectional view showing a sequence of tensioning partially tensioned strands with design tension.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

4 and 5 show cross-sectional views of schematic compact multi-strand cables in a state where the glider passes in the process of manufacturing a compact multi-strand cable according to the method of the present invention, respectively, and FIG. A schematic, cross-sectional view of a compact multi-strand cable showing the order of tensioning of the strands in the extended condition is shown. On the other hand, Figure 7 is a schematic perspective view of the glider used in the step shown in FIG.

First, prior to explaining the method of constructing a compact multi-strand cable according to the present invention, the terminology used herein is defined with reference to FIG. 3 for convenience. The compact multi-strand cable 1 installed in the cable support bridge according to the construction method of the present invention has a cross-sectional structure in which a plurality of strands 102 are concentrated in the outer shell pipe 101. In the focused state, as illustrated in FIG. 3, the strand 102 may be divided into a plurality of horizontal rows. That is, in the cross section of the compact multi-stranded cable, a plurality of strands 102 are arranged side by side at the same horizontal position to form a horizontal row, and the horizontal rows have a form in which a plurality of the horizontal rows are stacked up from the bottom. will be. Therefore, in the present specification, as shown in FIG. 3, the horizontal columns stacked from the top to the bottom are named in the order of the first horizontal column, the second horizontal column, and the third horizontal column for convenience. For example, if 55 strands are used as shown in the figure, there are nine horizontal rows in total, each of the first horizontal row 111, the second horizontal row 112, and the third horizontal row from top to bottom, respectively. Row 113, fourth horizontal row 114, fifth horizontal row 115, sixth horizontal row 116, seventh horizontal row 117, eighth horizontal row 118, and ninth horizontal row ( 119).

4 to 7 again, FIG. 4 is a schematic cross-sectional view of a state in which the strands of the first horizontal row 111 are arranged in the shell pipe 101, and FIG. 5 is a second horizontal row subsequent to FIG. 4. It is a schematic sectional drawing of the state which arrange | positioned the strand of 112, and FIG. 6 is a schematic sectional drawing for demonstrating the tension sequence of strand in FIG. FIG. 7 is a schematic perspective view of the glider 200 used in the steps shown in FIG. 5. As shown in the figure, after connecting one strand 102 to the glider 200, connecting the leader line 201 to the tip of the glider 200, the glider 200 inside the outer pipe 101 By locating the leader line 201 to allow the glider 200 to pass through the inside of the jacket pipe 101 so that the strands 102 connected to the glider 200 are positioned in the jacket pipe 101. And as shown in Figure 4 by repeating the passing of the glider 200, the horizontal column of the uppermost layer, that is, the first horizontal column 111 of the strands are formed in the outer pipe 101, and the compact multi-strand cable Upon completion of the hypothesis, the strands of the first horizontal row 111 are tensioned to have the required design tension for each strand (step 1). That is, the strand of the first horizontal row 111 is full tension.

By tensioning the strands of the first horizontal row 111 by the design tension force, the first horizontal row 111 is brought into a taut state, but the outer pipe 101 is bent by its own weight, and thus, the first horizontal row 111 ) Strands are located in close contact with the ceiling inner surface of the jacket pipe 101 in the jacket pipe 101. In this state, when the wind and the like is acting as shown by the dotted line in Figure 4, the outer pipe 101 is in an unstable state to move.

Therefore, after connecting the strand to the glider 200 following the state shown in FIG. 4, the work passing through the inside of the outer pipe 101, that is, the "reciprocating operation of the glider 200" is additionally repeated, as illustrated in FIG. 5. As described above, a strand is disposed below the first horizontal row 111 to form the second horizontal row 112. The strands of the second horizontal row 112 are also tense to have the design tension required for each strand upon completion of the compact multi-strand cable hypothesis (step 2). As such, when the second horizontal row 112 is disposed, the phenomenon in which the outer pipe 101 moves as shown by the dotted line in FIG. If necessary, in order to prevent the envelope pipe 101 from moving by wind, the reciprocating operation of the glider 200 is additionally performed after the formation of the second horizontal row 112, although not illustrated in the drawing. The third horizontal row 113 is disposed below the second horizontal row 112, and the third horizontal row 113 also has a design tension required for each strand upon completion of the compact multi-strand cable construction. You can do something nervous.

As mentioned above, in FIG. 6, after the first horizontal row 111 and the second horizontal row 112 are disposed, the "tension tension" required for each strand in the compact multi-strand cable hypothesis completion step as described above is provided. In tension, a schematic cross section showing the tension sequence of each strand is shown. In FIG. 6, the numbers in the original letters attached to the respective strands indicate the order of tension of the strands forming the first horizontal row 111 and the second horizontal row 112 in the present embodiment. In arranging the strands constituting the first horizontal row 111 and the second horizontal row 112 and tensioning with a design tension force, respectively, in the present invention, starting from the strands located at the outer side of each horizontal row, the left side is viewed from the front. Alternating between the right and the right, the strands in an alternating order to proceed inwardly tension. That is, as shown in FIG. 6, the strands on both sides of the three strands forming the first horizontal row 111 are sequentially tensioned, and then the strands located at the center thereof are tensioned, forming the second horizontal row 112. After arranging the six strands, tension the strands on one edge of the six strands, and then strain the strands located on the opposite edge, and subsequently place the strands on the opposite side of the strands not yet tensioned. Tension, and repeat this order to the inner side from the edge to the inner side of the second horizontal row 112 alternately to tension the strands. As described above, when the strands are tensioned in an alternating order from the edge to the inside in one horizontal row, the strands of the edges are already in the tensioned state even though the strands located inside are subjected to the force to be pushed out by the tension force. Therefore, it is not pushed outwards and is tensioned in a state in which it is kept in place continuously, and thus the effect of being neatly tensioned in the first arranged state is exerted.

On the other hand, when the installation work of the first horizontal row 111 and the installation of the second horizontal row 112, and if necessary, the installation of the third horizontal row 113, the outer pipe 101 of the Since there is still a large space inside, the glider 200 used at this time has a thickness and width that can be moved while filling the inside of the jacket pipe 101, as shown in FIG. The glider 200 is connected to the leader line 201 at one end in the longitudinal direction and the strand 102 is connected to the other end thereof, so that the leader line 201 is pulled through the inside of the outer pipe 101 to the glider 200. A member in which the connected strands 102 are positioned in the jacket pipe 101, wherein the first horizontal train 111 and the second horizontal train 112, and, if necessary, the third horizontal train 113, are encased in the jacket pipe 101. In the state located therein, there is sufficient space inside the sheath pipe 101 below the strands arranged and tensioned in the upper layer, so that the glider 200 can be as thick as needed up and down as shown in FIG.

As described above, after the first horizontal row 111 and the second horizontal row 112 are disposed and tensioned in the outer shell pipe 101, or the first horizontal row 111 and the third horizontal row 113 to the outer horizontal pipe 113. After being placed and tensioned in 101, horizontal rows of strands are stacked one after the other from the bottom of the sheath pipe 101 (step 3). That is, while repeating the reciprocating operation of the glider 200 to form a horizontal row of strands from the bottom of the outer shell pipe 101, the horizontal row is laminated sequentially from the bottom up. FIG. 8 is a schematic cross-sectional view showing three horizontal rows stacked from the bottom of the outer sheath pipe 101. For example, when a compact multi-strand cable is manufactured with 55 strands, FIG. As shown, the horizontal rows of strands are stacked and arranged from the bottom in the order of the ninth horizontal row 119, the eighth horizontal row 118, and the seventh horizontal row 117. At this time, the strands of each horizontal row stacked from the bottom up are not in tension, but are in a tensioned state at a pressure of about 30 to about 80 bar. That is, the strands in each horizontal row stacked from the bottom up are partially tensioned at a pressure of about 30 to about 80 bar less than the design tension required for each strand upon completion of the compact multi-strand cable construction. As described above, it is most preferable that the specific tension force is about 50 bar when partially tensioning the strands of each horizontal row stacked from the bottom up.

FIG. 9 is a partial cross-sectional view for explaining an adverse phenomenon that occurs when the horizontal columns are sequentially stacked from the bottom to the top of the state of FIG. When the horizontal columns are sequentially stacked from the bottom to the top, when the strands of each horizontal column are left untensioned at all, as shown in FIG. 8, the next higher horizontal column stacked on the ninth horizontal column 119 placed on the lowest layer, ie, The strands of the eighth horizontal row 118 are moved down in the direction of arrow A of FIG. 9 while being drooped down by their own weight, and thus are penetrated into the gaps between the strands of the ninth horizontal row 119. The strands and strands of the eighth horizontal row 118 are arranged in an tangled form with each other. This arrangement state makes the inner area of the outer pipe 101 abnormally narrow, so as to be described later, it is difficult to pass the glider 200 when the seventh horizontal row, the sixth horizontal row, etc. are sequentially stacked. Not only does it cause or make it impossible, but it also causes the problem that, in the future, when the strand placement in the jacketed pipe is all completed and introduces design tension to the strands that have been stacked from below, adverse stress is applied to the jacketed pipe 101. do.

However, in the present invention, when the horizontal rows of the strands are stacked from the bottom up in the order of the ninth horizontal row, the eighth horizontal row, and the seventh horizontal row, and arranged in the jacket pipe 101, the strands of the horizontal rows stacked are in a state of tension. Since it is made to be in a partial tension state at a predetermined pressure rather than in the above, as described above, it is possible to fundamentally prevent the occurrence of the arrangement disturbance between the horizontal rows due to the self-weight in the tensionless state. In other words, when performing the "partial tension" to tension each strand in the horizontal row that is sequentially stacked from the lower layer with a tension force of about 30 to 80 bar (preferably about 50 bar), between the ninth horizontal row and the eighth horizontal row In this relationship, since the eighth horizontal row is also pulled by the partial tension to support the weight of the strand, the phenomenon in which the eighth horizontal row of strands penetrate between the strands of the ninth horizontal row by the own weight does not occur.

FIG. 10 is a schematic cross-sectional view of a sixth horizontal row 116 and a fifth horizontal row 115 disposed above the seventh horizontal row 117, and FIG. 11 is used in the state of FIG. 10. A schematic perspective view of a glider 200 is shown. When the horizontal rows are sequentially stacked from the bottom and partially tensioned to fill the inside of the outer pipe 101, the horizontal rows of the upper layers, that are, the first horizontal rows or the second horizontal rows, which are already arranged with the design tension, or The space between the first horizontal column and the third horizontal column and the horizontal column stacked from the lower layer becomes narrower, so that the space through which the glider 200 passes. Therefore, as shown in FIG. 11, the thickness of the glider 200 is gradually reduced in accordance with the narrowed gap, thereby making it possible to pass the narrowed gap.

FIG. 12 is a schematic cross-sectional view showing a state in which only the interval of the last one horizontal row is present in the outer pipe 101 and the glider 200 passes through the interval in FIG. 10. 13 is a schematic perspective view of the glider 200 used at this time. Also shown in FIG. 14 is a schematic cross-sectional view showing the state where the glider 200 passes to place the last strand in the last horizontal row following the state of FIG. 12, and FIG. 15 is a schematic of the glider used at this time. A perspective view is shown. 11 to 13, when the space passing through the glider 200 becomes narrow while sequentially stacking horizontal rows from the bottom to the bottom, the thickness of the glider 200 is gradually reduced and the horizontal The direction width is also gradually reduced to pass the glider 200 into the jacket pipe 101 to arrange the strands.

When all the necessary number of strands are arranged in the outer pipe 101, the partially tensioned strands are all tensioned sequentially to have the required design tension for each strand (step 4).

As described above, in order to sequentially tension strands partially tensioned with a tension force of about 30 to 80 bar, it is preferable to tension the strands in alternating order from the edge to the inner side.

In the middle of the length of the compact multi-strand cable, the strands are concentrated so that the sides thereof closely adhere to each other, but at the end of the compact multi-strand cable settled in the cable anchorage of the bridge, the strands are laid out with a gap between the sides of the strands. do. Therefore, when the strands that are partially tensioned in this arrangement structure are sequentially tensioned, when the strands located inside of the cross-sectional shape are first pulled and tensioned, the strands located inside the focused cross section penetrate outwardly. This happens.

In order to prevent such a phenomenon, for each horizontal row of strands that have been stacked and partially tensioned while moving upward from the inner space of the outer pipe 101, the strands are alternately arranged from the edge to the inner side as described above with reference to FIG. 6. It is necessary to relax.

Specifically, FIG. 16 is a schematic cross-sectional view showing the order of tension to the design tension of the stacked strands going from the bottom of the inner space of the outer pipe 101 upward in the compact multi-strand cable according to the invention. That is, the number of original characters displayed on the cross section of each strand in FIG. 16 represents an example of an order in which each strand is tense. As shown in FIG. 16, the upper horizontal rows in tensioning each horizontal row of strands stacked and partially tensioned upward from below the inner space of the outer pipe 101 to have the required design tension for each strand. In order to proceed in the order of the lower horizontal row, and in each horizontal row, starting from the strands located at the edge alternately in the order of the strands located in the inner side alternately in the order of tension. According to this method, the phenomenon in which the strands located inside in the cross-sectional shape move outward and penetrate between the strands of the edges is suppressed, and thus, each strand can be tensioned in the state arranged in the original state.

According to the hypothesis method of the present invention by such a series of processes, it is possible to manufacture a compact multi-strand cable, the diameter of the outer pipe is significantly reduced compared to the conventional, thus reducing the wind load transmitted by the multi-strand cable, As a result, it is possible to enjoy the effect of reducing the required strength for the portion where the bridge tower or the bottom plate and the multi-strand cable of the bridge is connected, it is possible to construct a more structurally advantageous bridge.

101: jacketed pipe
102: strand
200: glider

Claims (3)

In the cable support bridge, the plurality of strands 102 are arranged in the jacket pipe 101 in a focused state, but the plurality of strands 102 are arranged side by side in the same horizontal position to form one horizontal row. As a method for installing a multi-strand cable (1) having a form in which a plurality of horizontal rows are stacked,
By repeating the reciprocating operation of the glider 200 through which the glider 200 passes through the inside of the jacket pipe 101, a horizontal row of the plurality of strands 102 is moved from the inside of the jacket pipe 101 to the bottom downward. Lay down and form a plurality of layers in sequence, and arrange the strands side by side in the horizontal position in the upper horizontal column and tension all the strands of the horizontal column with the design tension to complete the installation of the upper horizontal column, The horizontal rows are arranged side by side in a horizontal position, and all the strands of the horizontal rows are tensioned with the design tension to perform the installation of the lower horizontal rows. From the first horizontal column 111 to the second horizontal column 112 or the first horizontal column 111 to the third horizontal column (1) Sequentially stacking up to 13);
By repeating the reciprocating operation of the glider 200 through which the glider 200 passes through the inside of the jacket pipe 101, a horizontal row composed of the plurality of strands 102 is moved upward from the bottom of the jacket pipe 101. While forming a plurality of layers in a sequential order ascending, the plurality of horizontal rows that are already installed in the upper portion of the jacket pipe 101 in a tensioned state by the design tension force, and sequentially from the bottom of the jacket pipe 101 upward Reciprocating operation of the glider 200 while reducing the width and thickness of the glider 200 in accordance with the interval with the horizontal row is stacked and rise, a plurality of rising from the bottom up in the jacket pipe 101 The horizontal row is partially horizontally tensioned so that tensions having a pressure of 30 to 80 bar are introduced into the strands arranged in the horizontal row of the lower layer. After completing the installation of the column, the strands forming the upper horizontal column on the upper part of the outer pipe 101 in such a way to perform the installation of the horizontal column by partially tensioning so as to introduce a tension force having a pressure of 30 to 80 bar Sequentially stacking horizontal rows while rising from the bottom to the top; And
After all the strands have been filled inside the outer sheath pipe 101, for the horizontal rows stacked from below, after further tensioning the strands partially tensioned with respect to the horizontal rows of the upper layer to have a design tension, the horizontal rows of the lower layer The method of hypothesis of compact multi-strand cable comprising the step of additionally tensioning each partially tensioned strand to have design tension, in a manner that further tensions the partially tensioned strands to have design tension. .
The method of claim 1,
When each strand is tensioned with a design tension in a horizontal row from the first horizontal row 111 to the second horizontal row 112 or from the first horizontal row 111 to the third horizontal row 113,
Starting from the strands located in the outer periphery of each horizontal row, the strands are sequentially tensioned inwards in order of alternating left and right when viewed from the front, so that all the strands of the horizontal rows are tensioned with the design tension. Hypothesis of compact multi-strand cable.
3. The method according to claim 1 or 2,
After all of the strands are filled in the outer sheath pipe 101, further tensioning the strands sequentially to have the design tension for all of the horizontal rows that have been stacked and partially tensioned from below,
Start with the strands located on the outer side of the upper horizontal column, and further tension the strands sequentially inward in the order of alternating left and right when viewed from the front to tension the strands of the horizontal column with the design tension, and subsequently Compact multi-strand cable, characterized in that the strands are further tensioned sequentially inward in order of alternating left and right when viewed from the front, starting from the strands located at the outer side of the horizontal row. Hypothesis method.

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