JP2967918B2 - Starting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of a starting and reaching portion provided on a shield excavation shaft for starting or reaching a shield excavator for excavating underground.

[0002]

2. Description of the Related Art As shown in FIG. 9, for example, as shown in FIG. 9, a start and reaching portion of a conventional shaft excavation shaft has a reinforced concrete shaft 100 formed underground, and a shield excavator 104 of the shaft 100 starts. The ground improvement is performed on the back side 101 of the part to be reached or the part 102 to be reached to prevent groundwater spouting, and the reinforced concrete of the starting and reaching part 103 is excavated by human power, and then the shield excavator 104 is started or reached. is there.

On the other hand, as disclosed in JP-A-5-302490, a rope-shaped or rod-shaped fiber reinforcement made of carbon fiber and synthetic resin is buried in concrete and can be excavated by a shield excavator. A large number of fiber-reinforced concrete members are prepared, and the large number of fiber-reinforced concrete members are connected to a long steel material such as an H-shaped steel to form a shaft component constituting a shaft shaft. The members are arranged so as to line up with the opening of the start reaching portion, and constitute the start reaching portion of the shaft shaft.

[0004]

However, in the case where the starting portion shown in FIG. 9 is made of reinforced concrete, direct excavation by a shield excavator is very difficult, and the construction period is long and the construction cost is high. In addition, there is a possibility that a problem of treating the excavated reinforced concrete waste may occur.
Furthermore, the ground improvement process for preventing the discharge of groundwater at the time of excavation is additionally required, and there is a possibility that groundwater may be contaminated by the treatment chemical.

On the other hand, in the structure disclosed in Japanese Patent Application Laid-Open No. Hei 5-302490, in which the starting portion is formed of fiber-reinforced concrete members, a large number of shaft members are used side by side. In addition, carbon fibers were expensive and the construction of shafts was uneconomical.

[0006] As described above, the conventional starting arrival portion may cause various problems. Therefore, the applicant of the present invention has found that the excavation is easy, the construction period is short, economical, and the reinforced concrete waste is excavated. There was no risk of groundwater contamination due to the treatment of ground treatment and ground improvement, etc., and we proposed a starting part of the shaft shaft for shield excavation using a composite member. As for the joint structure with a rigid member which is a structural member of a shaft shaft, an economical structure that can be connected more easily, reliably and firmly has been found.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint structure of a rigid member, which is a structural member of a shaft shaft, and a composite member, which constitutes a starting and reaching portion where a shield excavator starts or arrives, which can be easily, reliably and firmly connected. It is an object of the present invention to provide an economical and economical joint structure of the starting point of the shaft shaft.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a plurality of long rigid members serving as structural members of a shaft for excavating shields, and a plurality of long rigid members provided at a predetermined depth in the ground. A starting or reaching part of the shield excavator that reaches from underground or starts from below, and has a structure in which a plurality of composite members reinforced with inorganic fibers of a plastic foam are joined to each other, and one end of the rigid member is attached to the composite member. Embedded and glued. The starting portion includes a plurality of composite members in which a plastic foam is reinforced with inorganic fibers, and the rigid member has one end embedded in the composite member and is bonded to the rigid member serving as a structural member of the shaft shaft and the starting reaching portion. Is an economical joint structure in which the composite members are easily, securely and firmly connected.

Further, a plurality of long rigid members serving as structural members of a shaft wall for shield excavation, and a start reaching portion of a shield excavator that starts or reaches underground at a predetermined depth position in the ground. And a structure for joining a plurality of composite members reinforced with plastic fibers to inorganic fibers, wherein one end of the first member sandwiches the composite member and is bonded to the composite member.
A second joining member fixed to the other end of the first joining member and having at least a horizontal piece, and a pair of a plurality of screw holes that sandwich the horizontal piece of the second joining member and have screw holes. A holding member; and the rigid member having one end screwed into a screw hole of the holding member.

[0010] The starting portion includes a plurality of composite members, a first joining member sandwiching and adhering the composite members, a second joining member having a horizontal piece, and a horizontal piece of the second joining member. By providing a plurality of holding members for holding the holding member and a rigid member screwed into a screw hole of the holding member, a rigid member serving as a structural member of the shaft shaft is provided in the same manner as the operation of the joining structure of the start reaching portion. This is an economical joint structure in which the composite members of the starting and reaching part are easily, securely and firmly connected.

Further, in any one of the above-described joining structures of the starting and reaching portions, the composite member is formed by reinforcing the plastic foam made of hard urethane resin with the inorganic fiber of glass long fiber. When the composite member is made of a rigid urethane resin foam reinforced with long glass fibers, in addition to the function of any one of the joining structures of the starting and reaching portions, the soil on the back side of the shaft wall is formed using inexpensive long glass fibers. It is possible to obtain a joint structure of the start reaching portion that sufficiently withstands pressure and water pressure. Also, since the plastic foam is made of hard urethane resin,
It has bending and compressive strength and is easily available at relatively low cost.

Further, in any one of the above-described joining structures of the starting and reaching portions, the composite member includes an uneven portion which receives a horizontal shearing force at an end of the composite member. In the case where the composite member is provided with an uneven portion which receives a horizontal shear force, in addition to the operation of any one of the joining structures of the starting and reaching portions, the uneven shear portion at the end of the composite member ensures the horizontal shear force. We receive and support.

Further, in any one of the joining structures of the starting and reaching portions, the composite member is formed from a combination of components having different components. If the composite member is formed from a combination of different components, use a composite member having the required physical and chemical properties as necessary, in addition to the function of any of the joining structures of the starting and reaching parts described above. It is economical.

Further, in any one of the joining structures of the starting and reaching portions except for the second invention, the composite member has a fastening means for fastening the composite member and the rigid member to an end of the composite member. It is provided. The composite member provided with the fastening means at the end thereof has the same strength as that of any one of the joining structures of the starting and reaching parts except for the second aspect of the present invention. Can withstand enough.

In any one of the joining structures of the starting and reaching portions except for the second aspect of the invention, the rigid member has one end embedded in the composite member and is joined via a joining member bonded thereto. It is. The rigid member, which is joined via the joining member, can uniformly receive the force applied to the composite member, in addition to the operation of the joining structure of any of the starting and reaching portions except for the second invention, Local stress concentration can be avoided.

Further, in any one of the joining structures of the starting and reaching portions, a rigid ring to which a sealing material is attached is fixed in a watertight manner along the end of the composite member of the starting and reaching portion. When the rigid ring is fixed in a watertight manner along the end of the composite member of the start reaching part, in addition to the function of the joining structure of any of the start reaching parts described above, the seal ring is used during excavation work by a shield excavator. The material can withstand the water pressure on the back side of the shaft wall, prevents groundwater from leaking into the shaft wall, and enables stable excavation work. Further, there is no need to improve the ground using chemical injection or the like on the back side of the shaft wall, and there is no risk of groundwater contamination.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a joining structure of a starting and reaching part according to the present invention. In the following description, the reference numeral of the composite member will be described as 9, unless it is particularly necessary to distinguish it.

FIG. 8 shows a shaft wall for shield excavation adopting the joint structure of the starting and reaching part according to the present embodiment,
(A) is the whole sectional view of a shaft, (B) is the principal part enlarged sectional view of (A). As shown in FIG. 8A, a shield excavator 42 that starts or reaches underground at a predetermined depth position in the ground, as shown in FIG.
And the reinforcing bar 6 shown in FIG.
Is formed of reinforced concrete 40 having a reinforced basket formed by combining the above. The shaft 2 is constructed by a known underground continuous construction method.

The shape of the starting and reaching part 4 is not limited to a circle, a rectangle, etc., but the width (thickness) is made substantially equal to the wall thickness of the shaft.
The shield excavator must be large enough to accommodate the external cross section.

As shown in FIG. 8 (B), the entrance 44 (entrance) of the starting and reaching part 4 is provided with a sealing material such as a sealing iron plate 34 (FIG. 1) and a side plate 13 (FIG. 5). The rigid ring 46 made of steel to which the 45 is attached is fixed in a watertight manner, that is, the rigid ring 46 is fixed by welding to the side edges of the fastening iron plate 34 and the side plate 13 or a ring steel plate or a packing is used as necessary. It is fixed so that water can be completely stopped by doing. When the water pressure on the back side of the shaft wall is high, the depth of the rigid ring 46 is increased, and the number of packings 45 is increased. The diameter of the front end of the entrance 44 is slightly larger than the diameter of the base.

As described above, the rigid ring 46 fixed in a water-tight manner along the end of the start reaching portion is sealed by the packing 45 during the excavation work by the shield excavator. It can withstand water pressure, prevent leakage of groundwater to the inside of the shaft wall 2, and perform excavation work stably. Further, since it is not necessary to improve the ground on the back side of the shaft wall 2 by injecting a chemical solution or the like, there is no possibility of groundwater contamination. Reference number 9 is a composite member described later.

FIGS. 1A and 1B show a first embodiment of a joint structure of a starting and reaching part according to the present invention, wherein FIG. 1A is a sectional view, FIG. 1B is a side view, and FIG. 2 is a first embodiment of FIG. (A)
1A is a cross-sectional view taken along line II of FIG. 1A, and FIG.
FIG. 2 is a sectional view taken along line II-II.

[0023] Joint structure 3 of the starting portion according to the first embodiment
Comprises composite members 9a and 9b in which a plastic foam made of hard urethane resin is reinforced with inorganic fibers of long glass fibers, and a reinforcing member 6 as a rigid member is provided with the composite member 9b.
One end 7 is buried in and bonded. Accordingly, the start reaching portion 4 is formed by further vertically arranging a plurality of composite members 9 formed by the composite members 9a and 9b. In this case, the reinforcing bar 6 may be an H-shaped steel, which is a rigid member.

The material of the adhesive used for the above-mentioned bonding is polyester or epoxy acrylate. When a reinforcing bar is used as the rigid member, the distal end side in which the reinforcing bar 6 is embedded is to increase the bonding strength between the reinforcing bar and the composite member.
In some cases, a nut or the like is attached to the tip of the rebar and embedded. The reinforcing bar 6 is a well-known deformed reinforcing bar having a thread-shaped outer surface, and for example, a thread joint made by Tokyo Steel Co., Ltd. (trade name) can be suitably used. Composite member 9
The length of insertion of the deformed reinforcing bar into the deformed reinforcing bar is a length at which a strength equal to or greater than the breaking strength of the deformed reinforcing bar is obtained by bonding. Here, when the rebar diameter is 16 mm, the thickness of the composite member 9b at both ends is 9c.
m.

Further, the composite member 9 is provided with an uneven portion 11 which receives a horizontal shearing force at an end portion 10 of the composite member 9, and a combination of components having different components, that is, physical property values forming both sides of the composite member 9. The composite member 9b is formed of a high composite member 9b and a composite member 9a having a relatively low physical property value forming a central portion of the composite member 9.

Further, the composite member 9 is formed of a composite material in which a plastic foam made of a hard urethane resin as a thermosetting resin is reinforced with inorganic fibers of long glass fibers, and has a thickness of several millimeters to several millimeters. A centimeter composite material is laminated in the fiber direction or alternately laminated in the fiber direction and the direction perpendicular to the fiber direction, and pressure-bonded with an epoxy-based adhesive. Is constituted. It does not absorb water even when immersed in water for a long time, and its size and strength hardly change. Further, the composite member 9 is formed of a hard urethane resin foam in which the long glass fibers have a monofilament state in the longitudinal direction, that is, a dispersion form in which the long glass fibers are uniformly dispersed one by one in the longitudinal direction. .

The strength of the composite member 9 can be changed depending on the blending state of the hard urethane resin and the long glass fiber. Further, in the above-described embodiment, the dispersion form in which the glass long fibers are uniformly dispersed in the longitudinal direction in a plastic foam made of a hard urethane resin which is a thermosetting resin, but the present invention is not limited to this. Instead, the glass long fibers may be uniformly dispersed not only in the longitudinal direction but also in a direction intersecting the longitudinal direction, or may be uniformly dispersed in any direction. Further, instead of glass long fibers, other inorganic fibers may be uniformly dispersed in a plastic foam made of a hard urethane resin.

In the present embodiment, the composite member 9b is made of a commercially available lightweight corrosion-resistant structural material, Eslon Neo-Lumbar FFU, of the type symbol FFU-74 (manufactured by Sekisui Chemical Co., Ltd.). Used the product code FFU-50 (manufactured by Sekisui Chemical Co., Ltd.), but the material is not limited to this, and other materials can be used as long as they satisfy the required characteristics. F
The physical properties of FU-74 are as follows: specific gravity 0.74 water absorption 3.3 mg / cm ² bending strength 146.11 Mpa (1490 kgf / cm ² ) bending Young's modulus 10.60 × 10 ³ (10.8 × 10 ⁴ kgf / cm ²⁾ compressive strength 57.85Mpa (590kgf / ^cm 2) shear strength 9.80Mpa (100kgf / cm ²⁾ impact strength (Charpy) 420kg-cm / cm ² linear expansion coefficient of 1.0 × 10 ~ ⁵ The The physical properties of FFU-50 are as follows: specific gravity 0.5 water absorption 6 mg / cm ² bending strength 70.60 Mpa (720 kgf / cm ² ) bending Young's modulus 6.37 × 10 ³ (6.5 × 10 ⁴ kgf / cm) ²⁾ compressive strength 29.42Mpa (300kgf / cm ²⁾ shear strength 3.43Mpa (35kgf / cm ²⁾ impact strength (Charpy) 150 kg-cm / cm ² linear expansion The number is 0.8 × 10 ~ ^5. As shown in the above characteristic values, Eslon Neo-Lumbar has several hundred kgf / cm as well as concrete.
There is a compressive strength of ² . In addition, by using two kinds of Eslon Neo-Lumbar FFU-74 and FFU-50 having different physical properties, a composite member having necessary and sufficient strength and being economical is provided. Of course, the selection of Eslon Neo Lumber is appropriately made according to the conditions of use.

[0029] The joining structure 3 of the starting and reaching part of the present embodiment.
Is provided with a tightening iron plate 34, a tightening bolt 35, and a nut 36, which are tightening means for tightening the composite member 9 and the rebar 6 at the end 10 of the composite member 9. The end portion 10 of the composite member 9 is reinforced by the tightening iron plate 34, the tightening bolt 35, and the nut 36 so that the end portion 10 is not broken when a large stress (bending moment, shearing force) is applied to the end portion 10. .
However, when it is considered that the stress generated at the end portion 10 is small, it is not necessary to perform the reinforcement by the fastening means.

The joining structure 3 of the starting and reaching part of the present embodiment having the above-described structure operates as follows. That is, the composite member 9 forming the starting and reaching portion 4 is formed by reinforcing a rigid urethane resin foam with long glass fiber, and the reinforcing bar 6 is embedded with one end 7 in the composite member 9 and bonded to the shaft structure. The reinforcing bar 6 serving as a member and the composite member 9 of the starting and reaching portion are easily and securely connected firmly and economically. Since the plastic foam is made of hard urethane resin, it has bending and compressive strength, is relatively easily available at a relatively low cost, and uses inexpensive glass long fibers to reduce the earth pressure and water pressure on the back side of the shaft wall 2. It is possible to obtain the joint structure 3 of the start reaching portion that can withstand sufficiently.

Further, when the composite member 9 is provided with the uneven portion 11 which receives the horizontal shear force, the composite member 9 is reliably supported by the horizontal shear force by the uneven portion 11 at the end of the composite member 9, When the composite member 9 is formed from a combination of components having different components, the composite member 9 having required physical and chemical properties can be used if necessary, and it is economical. And the one provided with the fastening means at the end 10 of the composite member 9 can sufficiently withstand the strength even when the stress applied to the end 10 of the composite member is large.

3A and 3B show a second embodiment of the joining structure of the starting and reaching part according to the present invention, wherein FIG. 3A is a sectional view, FIG. 3B is a side view, and FIG. 4 is a second embodiment of FIG. (A)
3A is a sectional view taken along the line III-III of FIG. 3A, and FIG.
FIG. 4A is a sectional view taken along line IV-IV of FIG. In the joint structure 3 of the start reaching part according to the second embodiment, the reinforcing bar 6 has a composite member 9b.
One end 26 is buried in the base plate and is bonded via an adhesive iron plate 25 which is a bonded bonding member. The adhesive iron plate 25 is coated with an epoxy-based adhesive on both sides, is embedded in the composite member 9b, and is pressure-bonded. The adhesive iron plate 25 and the reinforcing bar 6
Flare welding is performed at the contact portion 27.

The joint structure 3 of the start reaching portion of the second embodiment is a joint between the reinforcing bar 6 and the bonded iron plate 25. However, in the case of joining the H-shaped steel and the bonded iron plate 25 instead of the reinforcing bar 6, the welding is performed. Alternatively, it is performed by appropriate joining means such as bolting. The end portion 10 of the composite member 9 is reinforced by the tightening iron plate 34, the tightening bolt 35, and the nut 36 so that the end portion 10 is not broken when a large stress (bending moment, shearing force) is applied to the end portion 10. . However, when it is considered that the stress generated at the end portion 10 is small, the reinforcement by the fastening iron plate 34, the fastening bolt 35, and the nut 36 is not performed.

When the reinforcing bar 6 is bonded via the adhesive iron plate 25, the force applied to the composite member 9 can be uniformly received, and the concentration of local stress can be avoided. In addition, in the other parts in FIGS.
The action parts are given the same reference numerals and their explanation is omitted.

FIGS. 5A and 5B show a third embodiment of the joint structure of the starting and reaching part according to the present invention, wherein FIG. 5A is a sectional view, FIG. 5B is a side view, and FIG. (A)
5A is a sectional view taken along the line V-V of FIG. 5A, and FIG.
FIG. 7 is a sectional view taken along the line VI-VI, and FIG. 7 is a sectional view taken along the line VII-VII of FIG. The joining structure 3 of the start reaching portion according to the third embodiment includes a side plate 13 serving as a first joining member having one end 14 sandwiching the composite member 9 and being bonded to the composite member 9, and the other end 15 of the side plate 13. A second joining member 19 having a top plate 20 which is at least a horizontal piece, and a pair of a plurality of clamping members having a screw hole 29 and sandwiching the top plate 20 of the second joining member 19. The coupler 28 and the nut 30 and the reinforcing bar 6 which is a rigid member whose one end is screwed into the screw hole 29 of the coupler 28 and the nut 30 are provided.

Here, when the rebar diameter is 16 mm, the thickness of the side plate is 6 mm, the length of the bonded portion in the axial direction is 18 cm, and the other dimensions are the same as those in the first and second embodiments.

The composite members 9a, 9b and the two inner side plates 13
Are coated with an epoxy adhesive on both sides of the side plate and are pressure-bonded. The side plates 13 on both sides and the composite member 9b are pressure-bonded by applying an epoxy-based adhesive to one surface of the side plates 13. Also in the third embodiment, the above-described deformed reinforcing bar is used as the reinforcing bar 6, but the composite member 9 and the side plate 13 are used.
Is an area where a strength equal to or higher than the breaking strength of the deformed reinforcing bar is obtained.

In the vicinity of the lower part of the side plate 13, the four side plates 13 and the composite member 9
And securely fixed.

The top plate 20 and the top plate 21 are joined by welding.
It may be one. A reinforcing iron plate 32 is provided at the upper end of the composite member 9.
Is provided. However, when the stress (bending moment, shearing force) generated in the composite member 9 is considered to be small, the reinforcing iron plate 32 is not installed. Top plate 1 and reinforcing iron plate 32, Top plate 2
And the side plate 13 are connected by a bolt 23 and a stop bolt 33, respectively.

The joint structure of the start reaching portion according to the third embodiment is economical because the reinforcing bar 6 serving as a structural member of the shaft shaft and the composite member 9 of the start reaching portion are easily and securely connected firmly and economically.
In addition, in the other parts in FIGS. 5 to 7, the same structures and operation parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

[0041]

According to the joint structure of the start reaching portion of the present invention, an economical joint structure in which the rigid member serving as a structural member of the shaft and the composite member of the start reaching portion are easily, reliably and firmly connected. is there. Due to the unevenness at the end of the composite member, the composite member is reliably supported by receiving horizontal shearing force, and if the composite member is formed from a combination of different components, the required physical and chemical A composite member having properties can be used, which is economical. The composite member provided with the fastening means at the end thereof can sufficiently withstand the strength even when the stress applied to the end of the composite member is large.

Further, when the rigid member is joined through the joining member, the force applied to the composite member can be uniformly received, and the concentration of local stress can be avoided.

[Brief description of the drawings]

1A and 1B show a first embodiment of a joining structure of a starting and reaching part according to the present invention, wherein FIG. 1A is a sectional view and FIG. 1B is a side view.

FIG. 2 shows a first embodiment of FIG. 1, and FIG.
FIG. 1B is a cross-sectional view taken along line II of FIG. 1A.

3A and 3B show a second embodiment of a joint structure of a starting and reaching part according to the present invention, wherein FIG. 3A is a sectional view and FIG. 3B is a side view.

FIG. 4 shows a second embodiment of FIG. 3, and FIG.
FIG. 3A is a sectional view taken along the line III-III, and FIG.
FIG. 4 is a sectional view taken along line V-IV.

5A and 5B show a third embodiment of the joining structure of the starting and reaching part according to the present invention, wherein FIG. 5A is a sectional view and FIG. 5B is a side view.

6A and 6B show a third embodiment of FIG. 5, and FIG.
5A is a sectional view taken along line V-V, and FIG. 5B is a sectional view taken along line VI-V in FIG.
FIG. 3 is a sectional view taken along line I.

FIG. 7 shows the third embodiment of FIG. 5, and shows V in FIG.
FIG. 7 is a sectional view taken along line II-VII.

FIGS. 8A and 8B show a shaft for excavating a shield employing a joint structure of a start reaching portion according to the present embodiment, wherein FIG. 8A is an overall sectional view, and FIG. 8B is an enlarged sectional view of a main part of FIG.

FIG. 9 is a cross-sectional view illustrating a start reaching portion of a shield excavation shaft and a start reaching method thereof according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 2 vertical shaft 3 starting reaching joint structure 4 starting reaching part 6 starting reaching part 6 Reinforcing bar or H-shaped steel (rigid member) 7 end 9 composite member 10 end 11 irregularities 13 side plate (first joining member) 14 end 15 other end 19th 2 joining member 20 top plate 1 (horizontal piece) 25 adhesive iron plate (joining member) 26 end 28 coupler (clamping member) 29 screw hole 30 nut (clamping member) 34 fastening iron plate (fastening means) 35 fastening bolt ( Tightening means) 36 Nut (Tightening means) 42 Shield excavator

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Iwai 312-6 Demachi, Omihachiman-shi, Shiga Prefecture (72) Ryoichi Taniguchi 1070-28, Jorakuji, Azuchi-cho, Gamo-gun, Shiga Prefecture 56-56 References 108779 (JP, A) JP-A-4-76188 (JP, A) JP-A-7-71077 (JP, A) JP-A-6-137065 (JP, A) JP-A 8-303178 (JP, A) JP-A-6-10420 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 301 E02D 5/10

Claims (7)

(57) [Claims] 1. A plurality of long rigid members that are structural members of a shield excavation shaft wall, and a start reaching portion of a shield excavator that starts or reaches the ground at a predetermined depth position in the ground. And a structure for joining a plurality of composite members reinforced with inorganic fibers to a plastic foam, wherein the rigid member has one end embedded in and adhered to the composite member. The joint structure of the starting point. 2. A plurality of long rigid members which are structural members of a shield excavation shaft wall, and a start reaching portion of a shield excavator which starts or reaches underground at a predetermined depth position in the ground. And a structure for joining a plurality of composite members obtained by reinforcing a plastic foam with inorganic fibers, a first joining member having one end sandwiching the composite member and adhered to the composite member, A second joining member fixed to the other end of the first joining member and having at least a horizontal piece, a plurality of pair of holding members that sandwich the horizontal piece of the second joining member and that have screw holes; And a rigid member having one end screwed into a screw hole of the member. 3. The joining of a start reaching part according to claim 1, wherein the composite member is formed by reinforcing the plastic foam made of a hard urethane resin with the inorganic fiber of a long glass fiber. Construction. 4. The starting reaching part according to claim 1, wherein the composite member has an uneven portion which receives a horizontal shearing force at an end portion of the composite member. Joint structure. 5. The joint structure for a starting and reaching part according to claim 1, wherein the composite member is formed from a combination of different components. 6. The composite member according to claim 1, wherein the composite member includes a fastening means for fastening the composite member and the rigid member at an end of the composite member. A joint structure of a starting and reaching part, characterized in that: 7. The rigid member according to claim 1, wherein one end of the rigid member is embedded in the composite member, and the rigid member is bonded via a bonded bonding member. The joining structure of the starting and reaching part.