JP3041814B2 - Joining device for starting part - 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 device for a start 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 applied to the back side 101 of the part to be reached or the part 102 to be reached to prevent the spouting of groundwater, 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. It is.

[0003] On the other hand, in a start reaching portion of a shaft shaft disclosed in Japanese Patent Application Laid-Open No. 5-302490, a rope-shaped or rod-shaped fiber reinforcement made of carbon fiber and synthetic resin is buried in concrete, and shield excavation is performed. A large number of fiber reinforced concrete members that can be excavated by a machine 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 vertical shaft constituting member constituting a vertical shaft wall. The member is such that the fiber-reinforced concrete members are arranged in a line at the start reaching portion.

[0004]

However, since the starting portion shown in FIG. 9 is made of reinforced concrete, it is very difficult to directly excavate with a shield excavator, and the construction period is long and the construction cost is high. Also, it was necessary to treat the excavated reinforced concrete waste. Furthermore, ground improvement work for preventing groundwater spouting during excavation was required, and there was a risk of groundwater contamination by the treatment chemicals.

[0005] On the other hand, the starting portion disclosed in Japanese Patent Application Laid-Open No. 5-302490 is formed of fiber-reinforced concrete members and uses a number of vertical shaft components side by side, so that the construction of the vertical shaft wall is complicated and the construction period is long. In addition, the construction of shafts was uneconomical due to the high cost of carbon fibers.

[0006] As described above, the conventional starting and reaching part has various problems to be solved. However, the applicant of the present invention has previously found that the excavation is easy, the construction period is short and economical, and that the excavated reinforced concrete waste is treated. In addition, we proposed a starting part of the shaft wall for shield excavation using composite members without ground improvement work and groundwater contamination by the treatment chemicals.

This time, the present invention relates to a joining apparatus for connecting a reinforced concrete member or an H-shaped steel member, which is a structural member of a shaft, to a composite member, which constitutes a starting and reaching portion of the shaft, which can be connected easily, reliably, and economically. We found a joining device for the start reaching part of a vertical shaft wall.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a structural member of a shaft for excavating shields, comprising a long reinforced concrete member formed of reinforced concrete, and a predetermined depth position in the ground. A start reaching part of a shield excavator that starts or reaches underground at the ground, and joins a composite member obtained by reinforcing a plastic foam with inorganic fibers, wherein the reinforced concrete member The joint of the composite member is vertically held via a reinforcing bar at the joint with the composite member.

[0009] By using the reinforcing bar which is integrally embedded in the reinforced concrete member and is exposed at the joint between the reinforced concrete member and the composite member, the joining becomes possible without preparing other special members. . By using the rebar to sandwich the joint of the composite member in the up-down direction, the reinforced concrete member and the composite member can be easily and securely joined firmly and firmly, and an economical joining device for the start reaching portion of the shaft shaft wall is provided. You can do it.

[0010] Further, in the joining device of the starting reaching portion, the reinforcing bar at the connecting portion of the reinforced concrete member has a male screw on the outside thereof, and is screwed to the male screw of the reinforcing bar and arranged on the reinforced concrete member side. A first screw member and a second screw member disposed and embedded on the composite member side, and provided on both sides of a joint portion sandwiched between the composite members to support and distribute a load applied from the reinforced concrete member. A joint of the composite member is sandwiched and joined between the first screw member and the second screw member via a member.

[0011] The joint between the first screw member and the second screw member for holding the joint of the composite member and joining the composite member is not only the function of the joining device of the starting and reaching part, but also the reinforcing bar of the joint of the reinforced concrete member. It is economical because only the reinforcing bar at the joint needs to have a male thread on the outside. Further, by providing a first screw member arranged on the reinforced concrete member side and a second screw member arranged and embedded on the composite member side while being screwed into the external thread of the reinforcing bar, the composite member is clamped and joined. Even if the size of the portion has some variation, the joint portion of the composite member can be securely fastened and sandwiched between the first screw member and the second screw member. Furthermore, by using the supporting members provided on both sides of the joint portion between which the composite member is held, the load applied from the reinforced concrete member can be supported and dispersed, and the deformation of the composite member can be prevented.

Further, in any one of the joining devices for a start reaching portion, the joint between the reinforced concrete member and the composite member is provided with an uneven portion for sharing a shear force applied to the joint. The joint between the reinforced concrete member and the composite member is provided with an uneven portion for sharing the shearing force applied to the joint. Is partly shared by the concave and convex portions, thereby reducing the shearing force applied to the reinforcing bar.

Also, a long H-shaped steel member formed of an H-shaped steel, which is a structural member of a shield excavation shaft, and a shield excavation that starts or reaches the ground at a predetermined depth position in the ground. And a joining member for joining the starting member and a composite member reinforced with a plastic foam body with inorganic fibers, wherein the composite member is connected to the H-shaped steel member at a position matching the H-shaped steel member. The H-shaped steel member and the composite member have a fitting groove into which the web of the mold steel member is fitted by a predetermined length, and the web fitted to the joint of the composite member and the composite member located on both sides of the web Are joined and fastened via a fastening member for preventing deformation of the composite member.

At a position where the composite member is aligned with the H-shaped steel member, H
By having a fitting groove for fitting the web of the mold steel member by a predetermined length, the H-shaped steel member and the composite member are reliably positioned at a position where they are aligned. Further, at this position, the web fitted into the joint of the composite member and the composite members located on both sides of the web are securely joined by being tightened via the tightening member for preventing deformation of the composite member. Is done. The clamping members on both sides disperse the clamping force to prevent deformation of the composite member.

In the joining device for a starting and reaching part using the H-shaped steel member, the H-shaped steel member has a pressing member for pressing a distal end surface of the composite member to prevent deformation of the composite member, and The joint between the H-shaped steel member and the composite member is provided with a detachment preventing means for preventing detachment between the H-shaped steel member and the composite member due to a tensile force.

Since the H-shaped steel member has the holding member, in addition to the function of the joining device for the starting and reaching portion using the H-shaped steel member, the tip surface of the composite member is averaged and pressed, and the compressive force applied to the composite member The stress caused by the load of
Prevents deformation of composite members. Furthermore, the provision of the slip-off preventing means at the joint between the H-shaped steel member and the composite member prevents the H-shaped steel member and the composite member from slipping off due to tensile force.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a starting and reaching part joining apparatus according to an embodiment of the present invention. In FIGS. 1 to 8, the same structures and working parts are denoted by the same reference numerals.

FIGS. 3A and 3B show a shaft wall including a start reaching portion according to the present invention, wherein FIG. 3A is an overall front view, and FIG.
FIG. 2 is a sectional view taken along line I-II. The joining device of the starting and reaching part of the present embodiment includes a plurality of long reinforced concrete members 7 which are structural members of the shield excavation shaft 2 and are made of reinforced concrete, and are provided at a predetermined depth position in the ground. The starting part 4 of the shield excavator that starts or arrives from the ground is formed, and a plurality of composite members 10 reinforced with inorganic fibers of a plastic foam are joined to each other. The reinforced concrete member 7 and the composite member 10 Joined at the joint 5. The space between the reinforced concrete members 7 or between the reinforced concrete member 7 and the composite member 10 is filled with concrete or mortar 40.

FIG. 1 shows a first embodiment of a joining device for a starting and reaching part according to the present invention, in which (A) is a longitudinal sectional view and (B).
FIG. 2 is a sectional view taken along line II of FIG. 1A, and FIG. 2 is a front view of FIG. The joining device 1 of the start reaching part of the first embodiment is a case where the bonding surface 14 of the composite member 10 is perpendicular to the cutting surface of the shield excavator. A joint 5a on the reinforced concrete member 7 side indicated by a two-dot chain line (hereinafter, referred to as a "joint 5a")
The reinforcing bar 8 has a male screw on the outside thereof, and a coupler 15 which is a first screw member screwed to the male screw and arranged on the reinforced concrete member side, and also screwed to this male screw and arranged on the composite member side. And a lock nut 16 as a second screw member to be embedded. The lock nut 16 is disposed in the embedding hole 10 e provided in the composite member 10, and is fastened together with the coupler 15 so as to sandwich the joint portion of the composite member, and then the periphery thereof is filled with cement milk or the like.

Furthermore, the joining device 1 of the starting reaching portion according to the first embodiment is provided with a load applied from the reinforced concrete member 7 provided on both sides of the joining portion 5b (hereinafter referred to as "joining portion 5b") on the composite member 10 side. A supporting portion for supporting and dispersing the member, for example, a joining portion 5b is vertically arranged 41 between the coupler 15 and the lock nut 16 via a first supporting iron plate 17 and a second supporting iron plate 18 each having a rectangular cross section and having a band shape. Hold and join. Here, the first supporting iron plate 17 is disposed on the reinforced concrete side, and the second supporting iron plate 18 is disposed so as to be embedded in the composite member.

Further, in the joining device 1 of the starting and reaching portion, the joint portion 5 between the reinforced concrete member 7 and the composite member 10 is provided with a concave / convex portion for sharing the shear force applied to the joint portion 5, for example, a cotter for preventing shearing. The shape of the cotter for preventing shearing is appropriately used such as a trapezoid or a rectangle. Further, the diameter of the reinforcing bar, the diameter of the coupler, the diameter of the lock nut, the thickness of the first and second supporting iron plates, and the like are changed depending on the magnitude of the tensile force, the compressive force, and the shear force acting on the joint. Tightening iron plates 20 are provided on both sides of the joint portion 5b, and are reinforced by being tightened with a tightening bolt 21 and a tightening nut 22.

The composite member 10 is a plurality of vertically long members formed by reinforcing a plastic foam, for example, a hard urethane resin foam with inorganic fibers, for example, long glass fibers. The composite member 10 is obtained by laminating a plurality of composite materials 11 with an adhesive. The composite material 11 is composed of a hard urethane resin which is a thermosetting resin and a long glass fiber in a monofilament state in a longitudinal direction, that is, a long glass fiber. Is about 3 cm in thickness formed from those having a dispersed form uniformly dispersed one by one in the longitudinal direction.

[0023] A plurality of these may be stacked in the fiber direction, or
By alternately overlapping the fiber direction and the direction perpendicular to the fiber direction or by pressure bonding with an epoxy-based adhesive to form a vertically elongated member with a thickness of several centimeters to several tens of centimeters and a substantially rectangular cross section A high-strength composite member 10 is completed. The material of the adhesive used for bonding the composite member 10 is a composite material 11
A suitable material such as an epoxy-based, polyester-based, or epoxy acrylate-based material is used depending on the material used.

Although the composite member 10 has a dispersion form in which long glass fibers are uniformly dispersed in a longitudinal direction in a plastic foam made of a hard urethane resin which is a thermosetting resin, the present invention is not limited to this. In addition, there are included those in which glass long fibers are uniformly dispersed not only in the longitudinal direction but also in the direction intersecting the longitudinal direction, or those in which the glass long fibers are uniformly dispersed in any direction. Further, a material in which other inorganic fibers are homogeneously dispersed in a plastic foam made of a hard urethane resin instead of glass long fibers is also included.

The composite member 10 thus formed is light, has excellent machinability, and is hardly corroded. Furthermore, since it is a foam having closed cells, it does not absorb water even when immersed in water for a long time, and its size and strength hardly change.

In the present embodiment, as the composite member 10, of the commercially available lightweight corrosion-resistant structural material Esrone Neolumbar FFU, the product code FFU-74 and the product code FFU-50 (both of which are Sekisui Chemical Co., Ltd.) (Manufactured by a company) or the like, but is not limited thereto, and other materials can be used as long as the required characteristics are satisfied. The physical properties of FFU-74 are as follows: specific gravity 0.74 water absorption 3.3 mg / cm ² bending strength 146.11 Mpa (1490 kg / cm ² ) bending Young's modulus 10.60 × 10 ³ (10.8 × 10 ⁴ kg / cm ²⁾ compressive strength 57.85Mpa (590kg / cm ²⁾ shear strength 9.80Mpa (100kg / 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: 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 coefficient 0. × 10 ^1-5. As shown in the above characteristic values, Eslon Neo-Lumbar is, like concrete, several hundred kg / cm ^2.
Has compressive strength.

FIG. 4 shows a joining device 1 for a starting and reaching part according to a second embodiment, similar to FIG. 1, wherein (A) is a longitudinal sectional view,
(B) is a sectional view taken along the line III-III of (A), and FIG. 5 is a front view of FIG. In the joining device 1 of the start reaching portion of the second embodiment, the bonding surface 14 of the composite member 10 is parallel to the cutting surface of the shield excavator. Further, the composite member 10
Are composed of a composite member 10b having high physical property values forming both sides thereof and a composite member 10a having relatively low physical property values forming a central portion of the composite member 10, They are joined by the adhesive described above.

Further, the composite member 10a has a cotter 24 for preventing shearing, which is an uneven portion which receives a horizontal shearing force.
And is formed separately from the composite member 10a, and is adhered with the adhesive. The composite member 10a uses, for example, the product code FFU-50 among the commercially available lightweight corrosion-resistant structural materials of Eslon Neo Lumber FFU,
The composite member 10b also uses the product type symbol FFU-74, but is not limited to this, and any other material that satisfies the required characteristics can be used. Two types of Eslon Neo Lumber FF with different physical properties
By using U-50 and FFU-74, the composite member 10 having necessary and sufficient strength and being economical can be provided.

The joining device 1 of the starting and reaching part according to the first and second embodiments having the above-described structure operates as follows. That is, by using the reinforcing bar 8 integrally embedded in the reinforced concrete member 7, the joining becomes possible without preparing other special members. By sandwiching the joining portion 5b in the vertical direction using the reinforcing bar 8, the reinforced concrete member 7 and the composite member 10 can be easily, reliably, firmly, and economically joined.

Further, the joint between the coupler 15 and the lock nut 16 by sandwiching the joint 5b is a joint 5a.
It is economical if only the rebar has external threads on its outside. By providing the coupler 15 which is screwed into the male screw of the reinforcing bar 8 and is arranged on the reinforced concrete member side and the lock nut 16 which is arranged and embedded on the composite member side, the size of the joint portion 5b to be clamped by the composite member is somewhat reduced. , The joint 5b can be securely fastened and pinched between the coupler 15 and the lock nut 16.

Further, by using the first and second bearing iron plates on both sides of the joint 5b between which the composite member is clamped, the load applied from the reinforced concrete member 7 to the composite member 10 is supported and dispersed, and Deformation can be prevented. That is, the first supporting iron plate 17 disperses the pushing force from the reinforcing bar 8, and the second supporting iron plate 18 disperses the tensile force of the reinforcing bar 8, so that even if a large tensile force or compressive force is applied, Reinforcing bar 8
Are provided to prevent the reinforcing member 8 from being pulled out of the composite member or being pushed into the composite member. By providing the shear preventing cotter 24 for sharing the shear force applied to the joint 5 at the joint 5 between the reinforced concrete member 7 and the composite member 10, a part of the shear force applied to the joint 5 is reduced. Sharing is performed by the shear preventing cotter 24 to reduce the shearing force applied to the reinforcing bar 8.

When the composite member 10 is formed by reinforcing a plastic foam made of hard urethane resin with inorganic fibers of long glass fibers, the starting portion 4 using inexpensive long glass fibers can be obtained. To reduce. Further, since the plastic foam is made of a hard urethane resin, it has bending and compressive strength, and can be easily obtained at relatively low cost.

Further, the plurality of composite members 10 of the starting and reaching part 4
Is formed using a foam resin, so that the excavation resistance is small and the excavation can be easily performed. When the composite member 10 is formed, a large space can be filled by the foaming action of the resin, so that the formation can be easily performed. In addition, the starting and reaching portion 4 formed by the composite member 10 is lightweight and connected thereto. Lighter overall, including reinforced concrete or reinforced concrete,
Easy to transport and build.

The start reaching portion 4 can sufficiently withstand the earth pressure and the water pressure on the back side of the shaft shaft, and can directly and easily connect the composite member 10 when the shield excavator starts or reaches. It is possible to excavate, and it is not necessary to break reinforced concrete as before. Therefore, the construction and excavation are easy, the construction period is short, the groundwater pollution can be eliminated, and the starting portion is economical and economical.

According to the test conducted by the present inventors, the cutting surface is more perpendicular to the cutting surface (the surface perpendicular to the cutting direction 42 shown in FIG. 1) than the cutting surface. It has been found that the machinability is better than in the case of being parallel to.

FIGS. 6A and 6B show a third embodiment of the joining device for a starting and reaching part according to the present invention, wherein FIG. 6A is a longitudinal sectional view and FIG.
6A is a cross-sectional view taken along the line IV-IV of FIG. 6A, FIG. 7 is a cross-sectional view taken along the line VV of FIG. 6A, and FIG. VI-VI line sectional view of 6 (A), (C)
FIG. 6A is a sectional view taken along the line VII-VII of FIG. or,
FIG. 8 shows the joining device 1 of the starting and reaching part of FIG.
Is a front view, (B) is a side view, (C) is VIII-V of (B).
III line sectional view, (D) is the IX-IX line sectional view of (B),
Are respectively shown.

The joining device 1 of the starting part according to the third embodiment.
Is a structural member of the shaft wall for shield excavation, a plurality of long H-shaped steel members 26 formed of H-shaped steel, and shield excavation that starts or reaches underground at a predetermined depth position in the ground. The starting part of the machine is constituted, and a plurality of composite members 10 in which a plastic foam is reinforced with inorganic fibers are respectively joined. The H-shaped steel is a known material generally used in construction work and the like. The composite member 10 includes an H-shaped steel member 26.
Has a fitting groove 12 for fitting the web 27 of the H-shaped steel member 26 by a predetermined length 28 at a position matching with the fitting groove 12.

Further, the H-shaped steel member 26 and the composite member 10 are connected to the web 27 fitted in the joint 5b and the web 2
The composite members 10c and 10d located on both sides of the composite member 7 are fastened to the tightening bolts 3 via two tightening iron plates 29 which are tightening members for preventing deformation of the composite members.
0 and the fastening nut 31 for fastening. When a large load (bending moment, shearing force, etc.) is applied to the connecting portion 5b, the tightening bolt 30 and the tightening nut 31 are applied to the tightening iron plate 29 so that the connecting portion 5b is not broken.
It is to be fastened and reinforced. The H-section steel in the third embodiment may use a steel sheet pile instead.
The predetermined length 28 of the H-shaped steel member web 27 is a length that can sufficiently withstand external loads such as earth pressure and water pressure.

Further, the H-shaped steel member 26 presses the distal end surface 13 of the composite member 10 to prevent deformation of the composite member 10 due to a compressive force, a shear force, or the like between the H-shaped steel member 26 and the composite member 10. Having, for example, a presser iron plate 33,
The joint 5 between the H-shaped steel member 26 and the composite member 10 is provided with a slip-off preventing means for preventing the H-shaped steel member 26 and the composite member 10 from falling off due to a tensile force, for example, a retaining cotter 35.

As shown in FIGS. 6 and 7, the composite member 10 is tightened by using bolts 38 and nuts 39 between the flanges of the H-shaped steel member 26 at the joint portion 5 to strengthen the joint. Further, the H-shaped steel member 26 and the composite member 1
Although an adhesive is also used for bonding with 0, the adhesive effect is included in the safety factor.

The joining device 1 of the starting and reaching part according to the third embodiment having the above-described structure operates as follows. That is, at the position where the composite member 10 is aligned with the H-shaped steel member 26, the fitting groove 1 into which the web 27 of the H-shaped steel member is fitted by a predetermined length 28.
2, the H-shaped steel member 26 and the composite member 10
Is surely positioned at a position that matches. Further, at this position, the web 27 fitted into the joint portion 5b and the composite members 10c and 10d located on both sides of the web 27 are
The composite member 10 is securely joined by being tightened via the tightening iron plate 29 for preventing deformation. The fastening iron plates 29 on both sides disperse the fastening force, and
0d deformation is prevented.

Since the H-shaped steel member 26 has the pressing iron plate 33, the distal end surface 13 of the composite member is pressed down evenly, and the compressive force between the H-shaped steel member 26 and the composite member 10 and the stress due to other loads are generated. Is reduced, and deformation of the composite member is prevented. Further, since a retaining cotter 35 is provided at the joint 5 between the H-shaped steel member 26 and the composite member 10, this H
It prevents the die member 26 and the composite member 10 from coming off due to tensile force.

The joining device 1 of the starting part according to the third embodiment.
In the above, the direction of the bonding surface of the composite member 10 is a direction perpendicular to the cutting surface. However, the direction of the bonding surface of the composite member 10 may be parallel to the cutting surface.

The other parts in FIGS.
Components having the same functions as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted. The composite member 10 shown in the second embodiment is composed of two combinations having different components, and the composite member 10b having high physical property values forming both sides thereof.
And a composite member 10a having a relatively low physical property value forming the central portion of the composite member 10 and joined to each other with an adhesive, according to the first embodiment and the third embodiment described above. It is needless to say that the present invention can also be applied to the composite member of the embodiment.

[0045]

According to the joining device of the starting reaching portion of the present invention, a reinforced concrete member or an H-shaped steel member serving as a structural member of a shaft shaft, and a composite member constituting a starting reaching portion at which a shield excavator starts or reaches. Can be easily, reliably and firmly joined, and is economical.

[Brief description of the drawings]

1A and 1B show a first embodiment of a joining device for a starting and reaching part according to the present invention, wherein FIG. 1A is a longitudinal sectional view, and FIG.
FIG. 3 is a sectional view taken along line -I.

FIG. 2 is a front view of FIG.

FIG. 3 shows a shaft shaft including a start reaching part according to the present invention,
(A) is an overall front view, and (B) is a sectional view taken along the line II-II of (A).

4A and 4B show a second embodiment similar to FIG. 1, wherein FIG. 4A is a longitudinal sectional view, and FIG. 4B is a sectional view taken along line III-III of FIG.

FIG. 5 is a front view of FIG. 4;

FIGS. 6A and 6B show a third embodiment of a joining device for a starting and reaching part according to the present invention, wherein FIG. 6A is a longitudinal sectional view, and FIG.
FIG. 4 is a sectional view taken along line V-IV.

7A and 7B show the joining device of the starting and reaching part of FIG. 6; FIG. 7A is a cross-sectional view taken along the line V-V of FIG. 6A;
FIG. 6C is a sectional view taken along line I-VI, and FIG. 6C is a sectional view taken along line VII-VII in FIG.

8 (A) is a front view, FIG. 8 (B) is a side view, and FIG. 8 (C) is VIII-VII of FIG. 6 (B).
FIG. 2D is a cross-sectional view taken along line I-D, and FIG. 2D is a cross-sectional view taken along line IX-IX of FIG.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joining device of start reaching part 2 Vertical shaft 4 Start reaching part 5 Joining part 7 Reinforced concrete member 8 Reinforcing rod 9 Male screw 10 Composite member 12 Fitting groove 13 Tip surface 15 Coupler (first screw member) 16 Lock nut (Second screw) 17) 1st bearing iron plate (bearing member) 18 2nd bearing iron plate (bearing member) 24 Shear preventing cotter (uneven portion) 26 H-shaped steel member 27 web 28 predetermined length 29 fastening iron plate (tightening member) Attached member) 33 Pressing iron plate (pressing member) 35 Prevention cotter (measuring prevention means) 41 Vertical direction

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshitsugu Oshima 6-31-3 Nagasaki, Toshima-ku, Tokyo (72) Inventor Hideo Iwai 312-6 Demachi, Omihachiman-shi, Shiga Prefecture (72) Inventor Ryoichi Taniguchi Gamo, Shiga Prefecture Jorakuji, Azuchi-cho, Gunno 1070-28 (56) References JP-A-7-71077 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (5)

(57) [Claims] An elongated reinforced concrete member formed of reinforced concrete, which serves as a structural member of a shield excavation shaft, and a shield excavator that starts or reaches underground at a predetermined depth position in the ground. A joining device for a starting arrival portion that constitutes a starting arrival portion and joins a composite member reinforced with a plastic foam with inorganic fibers, wherein the reinforced concrete member includes a reinforcing member that joins the composite member and the composite member. A joining device for a starting and reaching part, wherein the joining part of the composite member is vertically held. 2. The first screw member according to claim 1, wherein the reinforcing bar at the joint of the reinforced concrete member has a male screw on the outside thereof, and is screwed to the male screw of the reinforcing bar and arranged on the reinforced concrete member side. And a second screw member disposed and embedded on the composite member side, via a bearing member provided on both sides of the sandwiched joint of the composite member to support and distribute the load applied from the reinforced concrete member. A joining device for a start reaching portion, wherein the joining portion of the composite member is sandwiched and joined between the first screw member and the second screw member. 3. The joining of a start reaching portion according to claim 1, wherein a joining portion between the reinforced concrete member and the composite member is provided with a concave / convex portion for sharing a shear force applied to the joining portion. apparatus. 4. A long H-shaped steel member formed of an H-shaped steel, which is a structural member of a shield excavation shaft wall, and a shield excavation which starts or reaches underground at a predetermined depth position in the ground. And a joining member for joining the starting member and a composite member reinforced with a plastic foam body with inorganic fibers, wherein the composite member is connected to the H-shaped steel member at a position matching the H-shaped steel member. The H-shaped steel member and the composite member have a fitting groove into which the web of the mold steel member is fitted by a predetermined length, and the web fitted to the joint of the composite member and the composite member located on both sides of the web And a joining member which is fastened and joined via a fastening member for preventing deformation of the composite member. 5. The H-shaped steel member according to claim 4,
The composite member has a pressing member that presses a distal end surface of the composite member and prevents deformation of the composite member. A tensile force between the H-shaped steel member and the composite member is provided at a joint between the H-shaped steel member and the composite member. A joining device for a starting and reaching part, comprising a detachment preventing means for preventing detachment by force.