JPS62268846A - Production of hollow fiber structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable to space vehicles, aircraft, automobiles, railway vehicles,
The present invention relates to a method for manufacturing pipe-shaped and other hollow fiber structures used for reinforcing resin molded products for ships, machinery, buildings, and other structural materials.

(Prior art) The above-mentioned resin molded products for structural materials include carbon Mt'l & fiber, graphite fiber, glass fiber, silicon carbide fiber, alumina fiber,
Strong and elastic materials such as metal fibers, polyester fibers, aliphatic or aromatic polyamide fibers.

A thermosetting resin or thermoplastic resin 1, such as epoxy, is applied to a three-dimensional fiber structure using single yarns, rovings, drawn yarns, twisted yarns, or a combination of these highly functional fibers with excellent rigidity and heat resistance. It is known that the material is obtained by impregnating it with a matrix resin such as resin or phenol resin, molding it into a desired shape, and curing it. When the resin molded product mentioned above is pipe-shaped, the fiber structure is also formed into a pipe shape. However, as a method of manufacturing such a pipe-shaped fiber structure, a large number of fibers are formed in parallel to the length direction. A method is known in which first yarns or warp yarns are arranged, and second yarns or weft yarns are laminated by arranging them in a meandering manner between a large number of warp yarns in a plane perpendicular to the warp yarns (Japanese Patent Application Laid-Open No. Publication No. 60-194145, JP-A-58-16374
(Refer to Publication No. 9 and Japanese Unexamined Patent Publication No. 58-220847)
If a cross-shaped vibrator such as a cross-shaped, L-shaped, or 7-shaped vibrator is required, conventionally, a plurality of straight fiber structures as described above are combined in a cross shape and bonded together. They were joined by means such as or sutures.

(Problems to be Solved by the Invention) Conventionally, straight pipe-like fiber structures were joined to form a cross-tube shape, which required troublesome joining work.
There have been problems in that the bonded portion becomes frayed, wrinkled, and uneven, resulting in a poor shape, and the strength of the bonded portion is lower than that of other portions, making this bonded portion more likely to break.

The first invention provides a novel method that can be used to form bifurcated bidirectional pipe parts from a longitudinal pipe part, and the second invention provides the above-mentioned method. By using the method of the first invention in combination with other methods, it is attempted to manufacture a cross pipe having an integral structure.

(Means for Solving the Problems) In the first invention, a large number of guide pipes are installed on a base plate in a detachable manner, and the weft thread is made to run in a meandering manner between these guide pipes, and A plurality of plate-shaped fiber laminates are formed by stacking the overlapping weft threads in alternating directions so that they intersect, and the warp threads are inserted into the guide pipe and pulled out to form the warp threads. By alternately performing the operation of replacing the fiber laminate with a plurality of fiber laminates from one end of one fibrous laminate.

Warp threads are threaded through the plurality of fiber laminates in a spiral manner to connect the plurality of fiber laminates into a hollow shape.

In the second invention, a large number of guide pipes are detachably installed on the base plate, the weft threads are made to meander between these guide pipes, and the directions are alternately changed so that the weft threads that overlap above and below intersect. By stacking, a cylindrical part in the vertical direction parallel to the guide pipe, an intermediate part having a shape that is an extension of at least a part of this cylindrical part, and protruding pieces protruding laterally from both left and right ends of the intermediate part. The fiber laminate is formed by forming at least one plate-like part such that the entire circumference of the cylindrical part is covered by the middle part of all the plate-like parts, and the protruding lengths of adjacent projecting pieces are equal. The warp threads are inserted into the guide pipe that passes through the cylindrical part and the middle part of the cylindrical part and the middle part, and the operation of removing the guide pipe and replacing the guide pipe with the warp thread is carried out around the entire circumference of the cylindrical part and the middle part. By repeating this process, the weft threads in the cylindrical part and the intermediate part are tied in the warp direction, while the warp threads are inserted into the guide pipe for each set of two projecting pieces, and the guide pipe is pulled out to guide the weft threads. By repeating the operation of replacing the pipe with the warp yarn alternately from one end of the protruding piece to the two protruding pieces, the warp threads are passed through the two protruding pieces in a spiral shape to form the two protruding pieces. are connected into a tubular shape in the horizontal direction, and then the cylindrical portion, the intermediate portion, and the projecting portion are respectively expanded into a hollow shape.

(Function) In the first invention, when the laminated lengths of the weft yarns in a plurality of plate-shaped fiber laminates are made equal and the above-mentioned fiber laminate is formed into a rectangular shape, the plurality of rectangular fibers By binding the laminate with warp yarns, a cylindrical body is formed in which the weft yarns are aligned in the generatrix direction and the warp yarns are threaded in a spiral manner. In addition, when the weft stacking length in a single plate-shaped fiber laminate is sequentially changed from the upper layer to the lower layer, and the fiber laminate is formed into a triangular, oval, rhomboid, convex lens cross-sectional shape, etc. Various hollow fiber structures can be obtained depending on the shape and number of hollow fiber structures. For example, when a fiber laminate is formed in the cross-sectional shape of a convex lens and a large number of the fiber laminates are connected with warp threads, a spherical fiber structure is formed seamlessly.

According to the second aspect of the invention, a hollow fiber structure having a cross-tubular shape is obtained, which includes a vertical tube section, a bidirectional tube section, and an intersection thereof. That is, by connecting the cylindrical part and the intermediate part of the fiber laminate with warp threads, the cylindrical part forms the pipe part in the warp direction of the hollow fiber structure, and the intermediate part forms the pipe part in the warp direction of the hollow fiber structure. form the intersection of Then, by connecting the protruding pieces of a set of two pieces of the fiber laminate with spiral warp threads, the protruding pieces form tube parts in two directions of the entire hollow fiber structure. This set of two projecting pieces is the first
This corresponds to the plate-shaped fiber laminate of the invention, and by applying the method of the first invention to the formation of the pipe parts in the two directions, the pipe parts in the vertical direction and the pipe parts in the two directions can be formed. The sections and intersections are formed into a seamless integral structure.

In addition, in the first invention and the second invention, the raking in which the guide pipes passing through the fiber laminate are replaced with warp yarns is as follows:
You can do this while removed from the base plate, but it is better to do it on the base plate so that the threads do not get tangled.

Work becomes easier.

(Embodiment) FIGS. 1 to 4 show a first embodiment of the first invention.
In the figure, l is a base plate, 2 is a guide pipe, and the guide pipe 2 is the warp 3 (
(see Figures 2 and 3).
The fiber laminates obtained by laminating the weft yarns 4 have a length greater than a desired height and are arranged along two parallel straight lines on one board 1. The guide pipe 2 is attached to the base plate 1 by inserting it into a hole drilled in the base plate 1 or by fitting into a pin implanted in the base plate 1 so that the guide pipe 2 can be easily attached and detached.

The weft thread 4 is wound in a meandering manner for each of the two rows of guide pipes 2 to a desired height of 111M. However, the weft threads 4 are folded back along the rows of the guide pipes 2, and the weft threads 4 overlap vertically.
4 are laminated in alternating directions so that they intersect. Then, the fiber density is adjusted by appropriately compressing the layers during lamination.

The obtained two plate-shaped fiber laminates 5, 5 (see Figure 2)
The warp threads 3 are inserted upward from below into the guide pipe 2 at one end of the fiber laminate 5, and the guide pipe 2 is pulled upward from the fiber laminate 5 at the same time or after the insertion. The upper end of this warp thread 3 is replaced with a warp thread 3, and the upper end of this warp thread 3 is connected to the guide pipe 2
The guide pipe is inserted from above downward, and this guide pipe is pulled out from below to replace the guide pipe 2 with the warp thread 3. This is then repeated alternately for the two fiber laminates 5.5 until all the guide pipes are inserted. 2 is replaced with warp yarn 3. As a result of this substitution, as shown in FIG. body 5
．． By abutting the upper ends and lower ends of the fibers 5 and shaping them, a horizontal tube (hollow fiber structure) 6 is obtained, as shown in FIG. In this tubular body 6, the weft threads 4 are arranged in a meandering manner in parallel along its generatrix,
The warp threads 3 run in a spiral shape in the circumferential direction and intersect with the weft threads 4 in a fabric-like manner.
The edges do not protrude like tufts.

In the above embodiment, the cylindrical tube 6 is formed using two plate-like fiber laminates 5.5 of the same shape, but three or more fiber laminates 5 can be used. In addition, when the laminated length of the weft yarn 4 is changed from the lower layer to the upper layer to form a trapezoidal plate-shaped fiber laminate that is vertically symmetrical with respect to the horizontal line, a tapered tube body with different diameters at both ends is formed. can get. Further, when a fiber laminate having a cross-sectional shape of a convex lens is formed, a ball-shaped hollow fiber structure 7 is obtained as shown in FIG. Further, by forming the example shown in FIG. 5 into a shape divided into left and right parts, a hemispherical or bowl-shaped fiber structure 8 as shown in FIG. 6 can be obtained.

7 to 11 illustrate embodiments of the second invention. In FIG. 7, there are four
The guide pipes 2 in rows 11, 12, 13, and 14 are arranged so that the guide pipes 2 in each row draw a W-shape, and the two adjacent rows 11, 12.12, 13.13, 14.14, and 11
The guide pipes 2 at both ends of are located at the vertices of the large square lO drawn on the base plate, and each row 11.12.1
3. The guide pipes 2 in the center of 14 are arranged to draw a small square. Note that each guide pipe 2 is detachably attached to plywood as in the example shown in FIG. The weft threads 4 are stacked in a meandering manner across the four rows of guide pipes 2 arranged in the above-mentioned small square shape, and the directions are alternately changed so that the vertically overlapping weft threads 4 intersect, until the desired height is reached. By doing so, the upper cylindrical portion 15 (see FIG. 9) is formed.

Next, as shown in FIG. 8, weft threads 4 are laminated along, for example, the third row 13 of guide pipes 2. In this case, the weft threads 4 are made to meander between the guide pipes 2, and are folded back and reciprocated at the guide pipes 2 at both ends, so that the weft threads 4.4 that overlap each other are made to intersect with each other. The above lamination is performed for each guide pipe 2 in each row 11, 12, 13, 14 to a desired height, and the four plate-like parts 16 bent in a W-shape are formed.
form. This plate-like part 16 consists of an intermediate part 16a that overlaps the upper cylindrical part 15 and a protrusion part 16b that protrudes to the side of the upper cylindrical part 15, and a set of two opposing protrusions. 1
6b, 16b.

Both have the same protrusion length. Then, the upper cylindrical portion 15 is placed on the intermediate portion 16a of the four plate portions 16.
Similarly, the upper cylindrical portion 17 is formed by laminating the weft threads 4 (see FIG. 9).

Above-mentioned upper cylindrical part 15. Upper and lower cylindrical parts 15.17 of the fiber laminate 18 consisting of four plate parts 16 and the upper cylindrical part 17
Then, the guide pipe 2 inserted through the intermediate part 16a is replaced together with the warp threads 3, and as shown in FIG. 10, while reciprocating the warp threads 3 up and down, make one round, and during this time weft thread 4
to connect. On the other hand, a set of two opposing projecting pieces 16b,
The guide pipe 2 of 16b is replaced with the warp yarn 3 in the same manner as in the examples shown in FIGS. 2 and 3, and the projecting pieces 16b and 16b are connected to form a tubular body in the horizontal direction.

Cross-tubular hollow fiber structure 19 obtained by tightening and shaping the warp yarns 3 during or after the above-described binding.
As shown in FIG. 11, the tube body portion 19a in the warp direction
, the horizontal tube portion 19b and their intersection 19c
It is equipped with upper and lower pipe parts 19a, 19 in the vertical direction.
a indicates the upper and lower cylindrical portions 15.1 of the fiber laminate 18 in FIG.
7, the lateral tube portion 19b is formed by the projecting piece 16b of the fiber laminate 18, and the intersecting portion 19c is formed by the intermediate portion 16a of the fiber laminate 18, respectively. That is, the horizontal tube portion 19b and the intersection portion 19
c is formed by four plate-shaped parts 16. Note that when replacing the guide pipes 2 in the cylindrical part 15.17 and the intermediate part 16a of the fiber laminate 18 with the warp threads 3, the warp threads 3 are bent, aligned and inserted into the guide pipe 2, and the guide pipe 2 is replaced with the warp threads 3. After the warp threads 3 are removed, threads may be passed through the bent loops of the warp yarns 3 protruding from the cylindrical portion 17 to connect all the bent loops. Further, in the arrangement of the guide pipes 2, the small square portions can be changed to a circular arrangement.

12 and 13 show a second embodiment of the second invention, in which the guide pipes 2 arranged in two rows as shown in FIG. The upper cylindrical part 21 (the 12th
(see figure), and then a wide range of guide pipes 2 extending to the left and right of the upper cylindrical part 21 for each front row and rear row.
The middle part 22 is laminated while reciprocating the weft thread 4 along the
Front and rear two plate-like parts 2 consisting of a and left and right projecting pieces 22b
2, and further, in the same manner as the upper cylindrical part 21, the upper cylindrical part 2 is formed.
form 3. The guide pipe 2 of the fiber laminate 24 consisting of the upper cylindrical part 21, the plate-like part 22 and the upper cylindrical part 23 is replaced with the warp 3, and the weft 4 of the upper and lower cylindrical parts 21, 23 and the intermediate part 22a is replaced with the warp 3. The two protruding pieces 2 facing each other in the front and rear
The warp threads 3 are threaded through 2b and 22b in a spiral manner to form a bidirectional cylindrical shape, thereby obtaining a cross-shaped hollow fiber structure 25 as shown in FIG.

This hollow fiber structure 25 has upper and lower tube parts 25 in the vertical direction.
a, 25a - horizontal direction left and right tube parts 25b, 25b,
and these intersections 25c.

14 to 16 show a third embodiment of the second invention. In this case, after stacking the upper cylindrical part 26 in the same manner as in the first embodiment, the upper cylindrical part 26 is stacked over two rows of guide pipes 2 in front and back in a wide area extending to the left of the upper cylindrical part 26, as shown in FIG. As shown, one intermediate portion 27a is formed by laminating U-shaped weft yarns 4.

The right edge of 27a is connected by the weft thread 4 to form one plate-like part 27 having a U-shaped cross section, and then the upper cylindrical part 28 is laminated in the same way as the upper cylindrical part 26 to form a fiber laminate 29. , further, the guide pipe 2 is replaced with warp threads 3 and shaped to form upper and lower pipe body parts 30a, 3 in the warp direction, as shown in FIG.
0a, an inverted T-shaped hollow fiber structure 30 consisting of a lateral tube portion 30b and an intersection portion 30c is obtained.

17 and 18 show the fourth actual flow side of the second invention. In this case, similar to the second embodiment, after laminating the bottom-shaped portion 31 and the plate-like portion 32 having a U-shaped cross section, , the lamination of the upper cylindrical part is omitted to form a fiber laminate 33, and the warp threads 3 inserted from below into one end of the lower circumferential part 31 on the back side are inserted into the intermediate part 32a.
It is inserted into one end of the front intermediate part 32a at the upper edge downward from above, then inserted into the adjacent guide pipe 2 on the front side upward from below, and further inserted into the opposing guide pipe 2 on the back side downward from above, Repeat this and guide pipe 2
By sequentially replacing the warp yarns 3 with the warp yarns 3, the upper edges of the intermediate portions 32a, 32a facing each other in the front and back are joined with the warp yarns 3.

The protruding pieces 32b, 32b are joined in the same manner as in the second embodiment, and the protruding pieces 32b, 32b are joined in the same manner as in the second embodiment. Then, tighten the warp threads 3 above.

The fiber laminate 33 is shaped to obtain an inverted hollow fiber structure 34 consisting of an upper tube portion 34a in the vertical direction, a tube portion 34b in the horizontal direction, and an intersection portion 34c, as shown in FIG. .

In all of the above embodiments, the projecting pieces 16b, 22b, 27
b, 32b, the lamination length of the weft yarn 4 is set to be the same from the lower layer to the upper layer, but by changing the lamination length, the diameter of the tube body portion in the weft direction can be reduced or expanded toward the tip. You can, and you can change direction. Further, as shown in FIG. 19, after forming the lower circumferential portion 36 in the same manner as in the example of FIG. Laminated on
Next, the upper cylindrical part 38 is laminated in the same manner as the lower cylindrical part 36 to form the upper and lower cylindrical parts 36, 38 and the two front and rear V-shaped plate parts 3.
As shown in FIG. 20, a fiber laminate 39 is formed by forming a fiber laminate 39 consisting of 7 fibers, and as shown in FIG. , 40b and a central intersection 40c.

Also, as shown in FIGS. 21 and 22.

By arranging a large number of guide pipes 2 in three rows so that the guide pipes at both ends of each row are located at the vertices of an equilateral triangle, and each row is bent in a chevron shape and faces each other, the pipe body in the vertical direction is Tube portions can be formed in three horizontal directions with respect to the tube portion. In this case, the guide pipes 2 in each row can be arranged in a W-shape as shown in the examples of FIGS. 7 and 8. Conversely, each of the four guide pipes 2 can be arranged in a chevron shape. In addition, when two rows of guide pipes 2 are used, the guide pipes 2 in each row may be arranged in a W-shape or otherwise. Note that the upper cylindrical portion 23 in the example of FIG. 12 is omitted, and the intermediate portion 22a A T-shaped hollow fiber structure is obtained by joining the upper ends of the fibers with the warp threads 3 in the same manner as in the example shown in FIG.

(Effects of the Invention) According to the first invention, a seamless tube body or other hollow fiber structure consisting of weft yarns laminated in a meandering manner along the generatrix and warp yarns running in a spiral shape and joining the weft yarns is provided. can get. The second invention combines the first invention with a method for manufacturing a warp-oriented tube by arranging the warp yarns in the generatrix direction and laminating the weft yarns in the circumferential direction. A seamless integral hollow fiber structure consisting of a body, a transverse tube and an intersection thereof is obtained.

Since each of the above-mentioned warp direction pipe body part, weft direction pipe body part and intersection part is formed with a uniform density due to the intersecting structure of the warp and weft threads, breakage is concentrated in one place unlike conventional methods. The shape and strength are stable. Furthermore, since the weft thread is passed through the intersection portion and the entire length of the lateral tube portion in both directions, the strength of the lateral tube portion, that is, the branch pipe is improved.

[Brief explanation of the drawing]

1 to 4 illustrate embodiments of the first invention, in which FIG. 1 is a perspective view of an apparatus used for laminating weft yarns, FIG. 2 is a perspective view of a fiber laminate made of weft yarns, and FIG. FIG. 2 is a perspective view of a fiber laminate joined by warp yarns. FIG. 4 is a perspective view of a tube (hollow fiber structure), FIGS. 5 and 6 are perspective views of a hollow fiber structure manufactured by the method of the first invention, and FIGS. 7 to 11 are This is to explain the first embodiment of the second invention, and FIG. 7 is a plan view illustrating the arrangement of guide pipes and the stacking of the cylindrical portions, FIG. 8 is a plan view showing the stacking of the plate portions, and FIG. FIG. 9 is a perspective view of a fiber laminate, FIG. 10 is a perspective view of a fiber laminate with warp threads inserted through it, FIG. 11 is a perspective view of a cross-tubular hollow fiber structure, and FIG.
2 is a perspective view of the fiber laminate of the second embodiment, FIG. 13 is a perspective view of the cruciform tubular hollow fiber structure of the second embodiment, and FIG. 14 is a perspective view of the fiber laminate of the third embodiment. Figure 15 is the 14th
16 is a perspective view of the inverted T-shaped hollow fiber structure of the third embodiment, FIG. 17 is a perspective view of the fiber laminate of the fourth embodiment, and FIG. FIG. 19 is a perspective view of the fiber laminate of the fifth embodiment; FIG. 20 is a perspective view of the cross-shaped hollow fiber structure of the fifth embodiment; FIGS. 21 and 22 are plan views showing other examples of arrangement of guide pipes. 1: base plate, 2 guide pipes, 3: warp, 4: weft, 5.18.24.29.33.39: li fiber laminate,
15.17.21.23.26.28.31.38: Cylindrical part, 16.22, 27.32.37: Plate part, 16a
, 22a, 27a, 32a. 37a: middle part, 16b, 22b, 27b, 32b, 3
7b: Projection piece part. Patent Applicant Shikishima Canvas Co., Ltd. Agent Patent Attorney Takeshi Sakano Daikichi 1) Ryo Tsukasa Figure 5 Figure 6 Barrel Figure 3m 21 Figure n oo
o. . ,,-2. ,2

Claims (1)

[Scope of Claims] [1] A large number of guide pipes are detachably installed on a base plate, and the weft threads are made to run in a meandering manner between these guide pipes, and the weft threads that overlap above and below intersect. A plurality of plate-shaped fiber laminates are formed by stacking the fibers in alternating directions, and the operation of inserting the warp threads into the guide pipes, removing the guide pipes, and replacing the guide pipes with the warp threads is performed on one fiber. The warp is applied to the plurality of fiber laminates alternately from one end of the laminate to pass the warp threads through the plurality of fiber laminates in a spiral shape to connect the plurality of fiber laminates into a hollow shape. A method for manufacturing a hollow fiber structure, characterized by: [2] The method for producing a hollow fiber structure according to claim 1, wherein the fiber laminate is formed into a rectangular shape by making the weft lengths of the laminated layers equal. [3] The method for manufacturing a hollow fiber structure according to claim 1 or 2, wherein the weft yarn is wound around a guide pipe at the end and laminated while being folded back. [4] A large number of guide pipes are detachably installed on the base plate, the weft threads are made to meander between these guide pipes, and the weft threads that overlap above and below are stacked by alternating directions so that they intersect. Accordingly, at least a cylindrical portion extending in the vertical direction parallel to the guide pipe, an intermediate portion having a shape obtained by extending at least a portion of this cylindrical portion, and protruding pieces protruding laterally from both left and right ends of the intermediate portion. One plate-shaped part is formed so that the entire circumference of the cylindrical part is covered by the intermediate parts of all the plate-shaped parts, and the protruding lengths of adjacent protruding pieces are equal, and this fiber laminate is Insert the warp threads into the guide pipe that passes through the cylindrical part and the middle part, pull out the guide pipe, and replace the guide pipe with the warp threads. Repeat this operation all around the cylindrical part and the middle part. By doing this, the weft threads in the cylindrical part and the intermediate part are connected in the warp direction, while the warp threads are inserted into the guide pipe for each set of two projecting pieces, and the guide pipe is pulled out. By alternately repeating the operation of replacing the warp yarns from one end of the protruding piece to the two protruding pieces, the warp threads are passed through the two protruding pieces in a spiral shape and the two protruding pieces are wefted. 1. A method for manufacturing a hollow fiber structure, which comprises connecting the fibers into a tubular shape in a direction, and then inflating each of the cylindrical portion, the intermediate portion, and the protrusion portion into a hollow shape. [5] A large number of guide pipes are arranged in two rows parallel to each other, and weft threads are stacked in a spiral shape across some of the opposing guide pipes to form a cylindrical part, and some of the guide pipes are stacked in a spiral manner. The air-permeable fiber according to claim 4, wherein a different weft is laminated in a folded manner at both ends for each of two rows of guide pipes in a wide range extending to both sides of the pipe to form two plate-like portions. Method of manufacturing the structure. [6] A large number of intervening guide pipes are arranged in two rows parallel to each other, and weft threads are laminated in a spiral shape across some of the opposing guide pipes to form a cylindrical part, and some of the guide pipes are stacked in a spiral manner. A common weft thread spanning two wide rows of guide pipes extending to one side of the pipe is folded back at the guide pipes at the end of each row on the extended side, stacking them in a U shape to form a single U. 5. The method for manufacturing a hollow fiber structure according to claim 4, wherein a letter-shaped plate portion is formed. [7] A large number of guide pipes are arranged in three rows along bending lines facing each other so that the guide pipes at both ends of each row are located at the vertices of an equilateral triangle drawn on the base plate, and the center A cylindrical part is formed by stacking the weft threads in a spiral manner across three rows of guide pipes surrounding the guide pipe, and a wide range of three parts extends to both sides of the central guide pipe in the direction of the apex.
5. The method for manufacturing a hollow fiber structure according to claim 4, wherein for each row of guide pipes, different weft threads are laminated in a folded manner at both ends to form three plate-like parts. [8] Arrange a large number of guide pipes in four rows along bending lines facing each other so that the guide pipes at both ends of each row are located at the vertices of a square drawn on the base plate, and A cylindrical part is formed by stacking the weft threads in a spiral manner across four rows of guide pipes surrounding the guide pipe, and a wide range of four parts extends to both sides of the central guide pipe in the direction of the apex.
5. The method for manufacturing a hollow fiber structure according to claim 4, wherein for each row of guide pipes, different weft threads are laminated in a folded manner at both ends to form four plate-like parts. [9] The method for manufacturing a hollow fiber structure according to any one of claims 4 to 8, wherein the cylindrical portions are formed above and below the intermediate portion, respectively. [10] The method for manufacturing a hollow fiber structure according to any one of claims 4 to 8, wherein the cylindrical part is formed on either the upper or lower side of the intermediate part.