JP6088883B2 - Connection method and connection structure of fiber reinforced pile material for shield excavation - Google Patents

Description

  The present invention generally relates to a structure of a fiber reinforced wall body for shield excavation in a tunnel excavation shaft having a start reaching portion for starting or reaching a shield machine for excavating underground, and in particular, shield excavation. It is related with the connection method and connection structure of the fiber reinforced pile material for shield excavation which comprises the fiber reinforced wall body which can be cut with a machine.

  As shown in FIGS. 11 (a) and 11 (b), the tunnel digging shaft 200 is constructed with a reinforced concrete wall body 201, a bottom plate 202, and the like, but an opening through which the shield digging machine 203 of the shaft 200 starts or arrives. It is proposed and practiced to use a fiber reinforced concrete wall 204 for the part so that it can be excavated by the shield machine 203.

  That is, the wall 201 made of reinforced concrete of the shaft 200 is constructed by the driving member 100 which is a steel member 101 such as H-shaped steel or box steel, but is fiber-reinforced concrete that can be cut by the shield machine 203. The wall body 204 is configured by arranging elongated elongated shield-reinforced fiber reinforced concrete materials (pile materials) 1 which are precast materials in the vertical direction at predetermined intervals. FIG. 13 shows an example of the fiber reinforced concrete material 1 for shield excavation.

  As understood with reference to FIG. 12, the fiber reinforced concrete material 1 is a fiber reinforced resin material produced by impregnating carbon fiber, organic fiber or the like with a resin as a reinforcing bar 3, that is, a main bar (FRP rod). ) 3a and stirrup muscle (FRP stirrup) 3b are assembled, for example, in a bowl shape and embedded in concrete using lime crushed stone as coarse aggregate, that is, high-strength limestone concrete 2. The fiber reinforced concrete material 1 having such a structure can be excavated by the shield machine 203.

  Usually, the fiber reinforced concrete material 1 has a substantially rectangular cross section, and the main reinforcement 3a is disposed along the natural ground side and the excavation side.

  Further, joint portions 10 for connecting to H-shaped steel, box-shaped steel, or the like, which is a constituent steel member 101 of the shaft 200, are integrally formed at the upper and lower ends of the fiber reinforced concrete material 1. For example, as shown in FIG. 13, the joint portion 10 includes a connection fitting 10a, a fixing jig 10b, and the like, and one end of the connection fitting 10a is connected to the shaft member steel member 101 by welding, a bolt, or the like. The other end is integrally connected to the steel end plate 10c of the fixing jig 10b formed integrally when the fiber reinforced concrete material 1 is manufactured, for example, by welding or bolts.

  The fiber reinforced concrete wall 204 using the fiber reinforced concrete material 1 for shield excavation having the above configuration has a feature that it can be excavated by the shield excavator 203, but has the following problems. I understood.

  That is, when the shield excavation fiber-reinforced concrete material 1 having the above-described configuration is cut from the excavation side to the ground mountain side by the shield excavator 203, the main reinforcement (FRP rod) 3a and the stirrup reinforcement (FRP stirrup) 3b. It has been found that the FRP reinforcing bars 3 such as the above are not necessarily cut into a strip state by the shield machine 203, and long chips are generated.

  Such long chips may be taken into the chamber of the shield machine 203 together with the concrete block and close the chamber inlet when discharged from the chamber. In that case, the shield machine 203 must be completely stopped and the concrete block must be removed manually.

  Therefore, fiber reinforced concrete for shield excavation in which fiber-reinforced resin grid-like members (FRP grids) made of vertical and horizontal grid bars impregnated with resin using carbon fiber or glass fiber are embedded and fixed. A material 1 has been proposed (see Patent Document 1). In the example shown in FIG. 14, a case where the FRP lattice bars 5 are arranged as main bars on the excavation side and the ground side of the fiber reinforced concrete 1 is shown.

  Since the fiber reinforced concrete material 1 for shield excavation having such a configuration is reinforced by the FRP lattice reinforcement 5, the wall strength can be easily adjusted, and the cutting by the shield machine 203 can be easily performed. Therefore, the chamber entrance of the shield machine 203 is not clogged.

JP 2002-89175 A

  However, the fiber structure reinforced concrete material 1 for shield excavation reinforced with the FRP lattice reinforcement 5 also has a joint structure for connecting the fiber reinforced concrete material 1 for shield excavation to the H-shaped steel as in the conventional example shown in FIG. The joint portion 10 includes a connection fitting 10a, a fixing jig 10b, and the like. One end of the connection fitting 10a is connected to the shaft member steel member 101 by welding, bolts, or the like. It is configured to be integrally connected to the steel end plate 10c of the fixing jig 10b integrally formed at the time of manufacturing 1 by welding, bolts, or the like. Therefore, this joint structure is supposed to be located outside the cutting area by the shield machine.

  However, when the construction site has an overhead restriction such as under a highway bridge, it is impossible to build the long shield fiber reinforced concrete material 1 for excavation into the shaft groove 204 and divide it into a plurality of pieces. It is forced to construct the fiber reinforced concrete material 1 for shield excavation joined in the field. In this case, in the joint structure using the metal member as in the structure of the upper and lower ends, cutting by the shield machine 203 is impossible or extremely difficult.

  Therefore, an object of the present invention is to improve the connection workability in the field, and the connection structure after connection can be cut by a shield machine, and the FRP reinforcing bars and the like can be cut into pieces. It is an object of the present invention to provide a connection method and a connection structure of a fiber reinforced pile material for shield excavation that constitutes a fiber reinforced concrete wall body that can be promoted.

The above object is achieved by the method and the connection structure of the fiber reinforced pile material for shield excavation according to the present invention. In summary, according to one aspect of the present invention, an elongated shield excavation fiber reinforcement in which the cross-sectional shape orthogonal to the longitudinal axis is a rectangular shape and at least both opposing surfaces are reinforced with reinforcing FRP lattice bars. In the connection method for connecting the fiber reinforced pile material for shield excavation, which is a pile material and divided into a plurality of pieces in the longitudinal direction, integrally in the longitudinal direction at the site,
The upper piece located on the upper side has an upper connection region where the reinforcing FRP lattice is exposed at the lower end,
The lower piece located on the lower side has a lower connection region where the reinforcing FRP lattices are exposed at the upper end,
Aligning the upper piece and the lower piece in the longitudinal axis direction, joining the lower end of the upper piece and the upper end of the lower piece,
Fitting and overlapping the connecting FRP lattices to overlap the exposed reinforcing FRP lattices at the lower end of the upper piece and the exposed reinforcing lattices at the upper end of the lower piece,
FRP stirrup bars are arranged on the outer periphery of the upper connection area of the upper piece in which the connection FRP lattice bars are disposed and the lower connection area of the lower piece in which the connection FRP lattice lines are disposed. And
A molding die is attached so as to surround the upper connection region of the upper piece and the lower connection region of the lower piece, a covering material is placed in the molding die, and the covering material is attached to the reinforcing FRP. Filling the grids and grids of the connecting FRP grids, covering the outer periphery of the upper connection region of the upper piece and the lower connection region of the lower piece, and solidifying the coating material;
It is the connection method of the fiber reinforced pile material for shield excavation characterized by the above-mentioned.

  According to an embodiment of the present invention, the shield excavation fiber-reinforced pile material divided into the plurality of pieces is a precast material using concrete, mortar, or foamed resin as a matrix material.

  According to another embodiment of the present invention, the covering material is concrete, mortar, or resin mortar.

  According to another embodiment of the present invention, the mold is a wood, a resin material, an FRP material, or an FRU material.

  According to another embodiment of the present invention, the reinforcing aggregate is filled in advance in the grids of the reinforcing FRP lattice and the connecting FRP lattice.

  According to another embodiment of the present invention, the reinforcing aggregate is an aggregate such as ordinary crushed stone, lime crushed stone, slag crushed stone, resin material, FRP material, or FRU material.

According to another embodiment of the present invention, the FRP lattice and the stirrup are a fiber reinforced resin material obtained by impregnating a reinforced fiber with a resin,
Examples of the reinforcing fibers include inorganic fibers such as carbon fibers, glass fibers, ceramic fibers, boron fibers, and basalt fibers; metal fibers such as titanium and steel; aramid, polyester, polyethylene, nylon, vinylon, polyacetal, PBO, and high-strength polypropylene. An organic fiber such as, or a hybrid type in which a plurality of the fibers are mixed,
As the resin, at least one kind of radical reaction resin such as vinyl ester resin, unsaturated polyester resin, polyamide resin, room temperature curable epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, MMA, epoxy acrylate, etc. Use what includes the above.

  According to another embodiment of the present invention, the joint surface of the upper piece and the lower piece is formed in a cotter structure that fits in an uneven shape.

  According to the other aspect of this invention, the connection structure of the fiber reinforced pile material for shield excavation connected by the said any connection method of the fiber reinforced pile material for shield excavation is provided.

  According to the present invention, on-site connection workability can be improved, and the connection structure after connection can be cut by a shield machine, and the fragmentation of FRP reinforcing bars and the like is promoted. be able to.

Fig.1 (a) is a perspective view which shows one Example of the fiber reinforced pile material for shield excavation divided | segmented into the several piece for implementing the connection method of this invention, FIG.1 (b) is crossing FIG. 2 (a) and 2 (b) are schematic perspective views for explaining the connection fittings at the upper end and the lower end of the fiber reinforced pile material for shield excavation that are integrated. FIGS. 3A and 3B are perspective views for explaining an embodiment of the FRP lattice. It is a schematic sectional drawing which shows the state which joined the fiber reinforced pile material for shield excavation divided | segmented into the several piece in order to demonstrate the connection method of this invention. It is a schematic perspective view which shows the state which joined the fiber reinforced pile material for shield excavation divided | segmented into the several piece in order to demonstrate the connection method of this invention. It is a cross-sectional view of the connection structure which connected the fiber reinforced pile material for shield excavation. In order to demonstrate the connection method and connection structure of this invention, it is a schematic sectional drawing which shows the state which joined the fiber reinforced pile material for shield excavation divided | segmented into the several piece. FIG. 8 is a detailed view of part A in FIG. 7. FIG. 8 is a detailed view of part A in FIG. 7 and shows another embodiment. It is a perspective view which shows the state before joining of the fiber reinforced pile material for shield excavation divided | segmented into the several piece in order to demonstrate the other Example of the connection method of this invention. Fig.11 (a) is a longitudinal cross-sectional view which shows schematic structure of a shaft, FIG.11 (b) shows the structure of the wall body which can be cut with the shield machine seen from the shaft. It is sectional drawing which shows an example of the wall body comprised using the conventional fiber reinforced pile material for shield excavation. It is a perspective view which shows an example of the conventional fiber reinforced pile material for shield excavation. It is a perspective view which shows an example of the conventional fiber reinforced pile material for shield excavation.

  Hereinafter, the connection method and the connection structure of the fiber reinforced pile material for shield excavation which concern on this invention are demonstrated in detail according to drawing.

Example 1
1 to 3 show an embodiment of the fiber reinforced pile material 1 for shield excavation divided into a plurality of pieces for carrying out the connection method of the present invention.

  In this embodiment, the fiber reinforced pile material 1 for shield excavation for carrying out the connection method of the present invention is composed of an upper piece 1A and a lower piece 1B. As shown in FIGS. 2 (a) and 2 (b), a joint portion 10 is integrally formed at the upper end of the upper piece 1A for connection to an H-shaped steel or a box-shaped steel that is a constituent steel member 101 of the shaft 200. Is done. Moreover, the joint part 10 for connecting with the H-shaped steel which is the structural steel member 101 of the shaft 200, or box-shaped steel etc. is integrally formed in the lower end of the lower piece 1B.

  The joint portion 10 at the upper end of the upper piece 1A and the lower end of the lower piece 1B includes a connection fitting 10a, a fixing jig 10b, and the like, and one end of the connection fitting 10a is welded to the shaft constituting steel member 101. The other end of the connecting metal fitting 10a is connected to the component end plate 10c of the fixing jig 10b integrally formed at the time of manufacturing the fiber reinforced pile material 1 by welding, a bolt, or the like. The structure of the joint portion 10 is not limited to this, and various other structures well known to those skilled in the art are possible.

(Fiber reinforced pile material for shield excavation)
Furthermore, referring to FIGS. 1A and 1B, the shield excavation fiber reinforced pile material 1 used when carrying out the connection method of the present invention will be described. In this embodiment, the shield excavation fiber The reinforcing pile material 1 has an elongated shape extending in the axial direction, and is composed of an upper piece 1A and a lower piece 1B. The upper piece 1A and the lower piece 1B are connected by a connection structure according to the present invention. Is done. In the present embodiment, the upper piece 1A and the lower piece 1B have the same configuration. That is, in this example, the fiber reinforced pile material 1 for shield excavation is a precast member, and the cross-sectional shape is 30 to 200 cm in length (L0) and 20 to 200 cm in width (W0), which is the same as the conventional one. It is made the shape dimension.

  However, in this embodiment, since the fiber reinforced pile material 1 for shield excavation is used at a site under a highway bridge or the like, the upper piece 1A and the lower piece 1B have a height (H0) of 1 to 1. The length is about 4 m, and a conventional long one cannot be used. Therefore, the upper piece 1A and the lower piece 1B constituting the fiber reinforced pile material 1 for shield excavation are connected by a connection structure using a lap joint that can be cut by the shield machine 203 as will be described in detail later.

  Moreover, in this example, the fiber reinforced pile material 1 for shield excavation, that is, the upper piece 1A and the lower piece 1B were produced by impregnating reinforcing fibers with resin as shown in FIG. A fiber-reinforced resin grid-like member used as a fiber reinforcing material, that is, an FRP lattice (main bar) 5 is a front side of a pile material 1 used as a columnar body (excavation side that is a cutting start side by a shield machine), and The precast material is disposed on the rear surface side (natural ground side) and embedded in the matrix material (core material) 2.

  The fiber reinforced pile material 1 for shield excavation is produced by impregnating a resin into the FRP lattice reinforcement (main reinforcement) 5 and the reinforcing fibers, as shown in FIG. A fiber reinforced resin reinforcing material to be used as a fiber reinforcing material arranged in a winding manner, that is, an FRP stirrup streak (FRP stirrup) is assembled in a bowl shape and embedded in a matrix material (core material) 2 to prepare. You can also

  In the present embodiment, concrete containing crushed limestone as a coarse aggregate, that is, crushed crushed stone concrete can be suitably used as the matrix material 2, but further, foamed resin such as mortar or hard urethane resin foam. It can also be. The precast material having such a structure can be excavated by a shield machine.

  As shown in FIG. 3 (a), the FRP lattice 5 usually includes a plurality of reinforcing bars arranged in a lattice pattern so as to intersect at right angles, that is, vertical reinforcing bars 5a and lateral reinforcing bars 5b. The reinforcing bars 5a and 5b are formed by laminating a plurality of layers of belt-shaped reinforcing fibers in which reinforcing fibers are arranged in one direction and impregnated with a resin.

  Reinforcing bars 5a and 5b used in this embodiment have a reinforcing bar width (w) of 1 to 20 mm, a thickness (t) of 0.5 to 25 mm, and an interstitial distance (W1) of 25. Formed and hardened in a lattice shape of ˜250 mm to form a sheet-like FRP lattice line 5 as a whole. As shown in FIG. 3B, the FRP lattice 5 is molded and hardened so that the thickness of the intersection of the lines is substantially equal to the thickness of the other portion. Further, the volume content of the reinforcing fiber in the FRP lattice 5 is 5 to 65%.

  As shown in FIG. 1B, the FRP stirrup muscle 6 can be a string-like or rod-like fiber-reinforced resin (FRP) in which reinforcing fibers are arranged in one direction and impregnated with a resin. The FRP stirrup 6 may have a rectangular cross-sectional shape as well as a circular cross-sectional shape. The FRP stirrup muscle 6 usually has a diameter (converted diameter in the case of a rectangular cross section) of 2 to 40 mm. Further, the volume content of the reinforcing fiber in the FRP stirrup muscle 6 is set to 5 to 65%. The FRP stirrup muscle 6 is not limited to the above-described structure, and various dimensions and forms well known to those skilled in the art, for example, as shown in FIGS. 4 and 7, use a partial structure of the FRP lattice muscle. It can also be a stirrup muscle with a branch.

  The fiber reinforcement constituting the FRP lattice 5 and the FRP stirrup 6 includes, as reinforcing fibers, inorganic fibers such as carbon fibers, glass fibers, ceramic fibers, boron fibers, and basalt fibers; metal fibers such as titanium and steel; Organic fiber such as aramid, polyester, polyethylene, nylon, vinylon, polyacetal, PBO, high-strength polypropylene, or the like, or a hybrid type in which a plurality of the fibers are mixed.

  Further, as the resin, at least a radical reaction resin such as vinyl ester resin, unsaturated polyester resin, polyamide resin, room temperature curable epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, MMA, epoxy acrylate or the like. What contains 1 or more types can be used.

(Connection method and connection structure)
As described above with reference to FIG. 2, the upper end of the upper piece 1 </ b> A and the lower end of the lower piece 1 </ b> B constituting the fiber reinforced pile material 1 for shield excavation are the same as in the prior art, such as the connecting bracket 10 a and the fixing jig 10 b A joint portion 10 is provided.

  On the other hand, the lower end of the upper piece 1A and the upper end of the lower piece 1B are connected by a connection method using the lap joint structure according to the present invention. A connection structure 10A of the present invention is shown in FIG.

  First, with reference to FIG. 4, FIG. 5, the structure of the lower end part of the upper piece 1A of the fiber reinforced pile material 1 for shield excavation and the upper end part of the lower piece 1B is demonstrated. The lower end portion of the upper piece 1A extends over a predetermined length (Ha) from the lower end surface 1Aa, for example, approximately 100 cm, and the upper end portion of the lower piece 1B has a predetermined length from the upper end surface 1Ba. (Hb), for example, the matrix material around the outer periphery of the precast material, for example, concrete 2 has been removed over a length of about 100 cm, and is disposed on the excavation side and the natural ground side of the fiber reinforced pile material 1 for shield excavation. The FRP lattice 5 which is a reinforcing material is exposed. A region where the FRP lattice 5 is exposed is a connection region H (Ha, Hb) of the joint structure. Further, the lower end surface 1Aa of the upper piece 1A is formed such that the core concrete portion 2A is formed in a convex shape and is fitted into a concave concrete portion 2B formed on the upper end surface 1Ba of the lower piece 1B. That is, the joining surfaces 2A and 2B of the upper piece 1A and the lower piece 1B have a cotter structure for shear transmission between the two piece members. Of course, a concave shape can be formed on the lower end surface 1Aa of the upper piece 1A, and a convex shape can be formed on the upper end surface 1Ba of the lower piece 1B.

  In connecting work, in order to join the upper piece 1A and the lower piece 1B configured as described above, the lower piece 1B is installed in the shaft groove 204 as shown in FIG. The lower piece 1B is supported by passing the support bar 8 through the support hole 7 formed in the lower piece 1B and supporting it on the support base 9 so that the connection region Hb is located above the shaft groove 204. . Next, the upper piece 1A suspended by a crane or the like is arranged above the lower piece 1B, aligned in the longitudinal axis direction, and the joining surfaces 1Aa and 1Ba of the upper piece 1A and the lower piece 1B are cottered. -Joined through structures 2A, 2B and held in that state.

  The FRP lattice lines 50 for connection are covered from the outside so as to overlap the FRP lattice lines 5 and 5 located in the connection regions H (Ha, Hb) of the upper piece 1A and the lower piece 1B, and are overlapped. That is, in this embodiment, as shown in FIGS. 4 and 5, the connecting FRP lattice reinforcing bars 50 are connected to the connection regions H (Ha, Hb) from the both sides of the shield excavation fiber reinforced pile material 1 on the excavation side and the natural ground side. 4, 6, and 7, the FRP stirrup muscle 6 is fixed to the connection region H (Ha, Hb) of the upper piece 1 </ b> A and the lower piece 1 </ b> B. As the connecting FRP lattice line 50, the same one as the reinforcing FRP lattice line 5 described above can be used.

Next, as shown in FIG. 7, the molding frame 60 is formed around the connection region H (Ha, Hb) of the upper piece 1 </ b> A and the lower piece 1 </ b> B where the connecting FRP lattice bars 50 and the FRP stirrup bars 6 are arranged. The covering material 20 such as mortar, concrete, resin mortar, or the like is placed in the forming mold 60. The covering material 20 can be placed on the site by pouring into the forming mold 60 at the connection portion around the pile with a pump or by counter-strike. As described above, these coating materials 20 are excellent in fluidity, can be reversed by a pump, have fast curing properties, and have extremely good workability. As a characteristic of the covering material 20,
-Fluidity: Slump flow 300-1200mm
・ Immediate curing: 5 to 1500 minutes ・ High compressive strength: 18 to 100 N / mm ²
・ It is required to be able to strike back with a pump.

  As shown in FIG. 8, the covering material 20 is filled in the cells 5 </ b> A and 50 </ b> A of the reinforcing FRP lattice 5 and the connecting FRP lattice 50 by placing the covering material 20 in the mold 60. , Solidified. The covering material 20 is filled in the cells 5A and 50A of the reinforcing FRP lattice 5 and the connecting FRP lattice 50, whereby the joint strength is achieved. As shown in FIG. 8, the core material (matrix material) 2 corresponding to the grid 5A of the reinforcing FRP lattice 5 is also removed by a predetermined depth (h), for example, h = 2 to 100 mm. It is preferable that the portion 2C is formed so that the covering portion 20 is also filled in the recessed portion 2C. With this configuration, the joint strength is further increased.

  Further, as shown in FIG. 9, before the covering material 20 is placed, the reinforcing FRP lattice 5 and the connecting FRP lattice 50 have the grids 5A and 50A, and the core recess 2C. In the formed space, for example, a reinforcing aggregate 71 such as an aggregate such as ordinary crushed stone, lime crushed stone, slag crushed stone, resin material, FRP material, or FRU material is placed in a mesh bag 72, for example. By arranging the reinforcing member 70 configured in advance, the joint strength can be further increased.

  The molding frame 60 can be removed after the coating material 20 is solidified, but can be removed by a shield machine 203 such as wood, resin material, FRP material, FRU (fiber reinforcement urethane), etc. By using this, it is not necessary to remove it, so that workability can be improved. In this case, it is preferable that the molding frame 60 is fixed to the upper and lower pieces 1A and 1B using FRP or resin bolts.

By carrying out the above connection method, the connection structure according to the present invention, that is, the cross-sectional shape orthogonal to the longitudinal axis is rectangular, and at least both opposing surfaces are reinforced by the reinforcing FRP lattice bars 5. A fiber reinforced pile material 1 for elongated shield digging, and a connection structure 10A for integrally connecting the fiber reinforced pile materials 1A and 1B for shield digging divided into a plurality of pieces in the longitudinal direction. Embodied. As can be understood with reference to FIGS.
(A) The upper piece 1A located on the upper side has an upper connection region Ha where the reinforcing FRP lattice bars 5 are exposed at the lower end,
(B) The lower piece 1B located on the lower side has a lower connection region Hb in which the reinforcing FRP lattice bars 5 are exposed at the upper end,
(C) The upper piece 1A and the lower piece 1B are aligned in the longitudinal axis direction, and the lower end portion of the upper piece 1A and the upper end portion of the lower piece 1B are joined,
(D) The connecting FRP lattice 50 is adapted to overlap the exposed reinforcing FRP lattice 5 at the lower end of the upper piece 1A and the exposed reinforcing lattice 5 at the upper end of the lower piece 1B. Superposition,
(E) FRP on the outer periphery of the upper connection region Ha of the upper piece 1A in which the connecting FRP lattice bars 50 are disposed and the lower connection region Hb of the lower piece 1B in which the connection FRP lattice bars 50 are disposed. Place stirrup muscle 6,
(F) The covering material 20 is placed so as to surround the upper connection region Ha of the upper piece 1A and the lower connection region Hb of the lower piece 1B, and the covering material 20 is formed into the reinforcing FRP lattice 5 and the connecting FRP. Filling the grid 50A of the lattice line 50, covering the outer periphery of the upper connection region Ha of the upper piece 1A and the lower connection region Hb of the lower piece 1B, and solidifying the covering 20;
Structured.

  Thus, the fiber reinforced pile material 1 for shield excavation having the connection structure in which the lower end of the upper piece 1A and the upper end of the lower piece 1B are connected by the lap joint structure according to the present invention supports the lower piece 1A. By removing the supporting rod 8, the shaft is built into the shaft groove 204.

  As described above, while producing the fiber reinforced pile material 1 for shield excavation by connecting the lower end of the upper piece 1A and the upper end of the lower piece 1B with extremely good workability using the connection method according to the present invention, FIG. As shown in Fig. 5, the wall body could be formed by being built in the shaft groove 204. Moreover, although this wall body was cut with the shield machine 203 having a diameter of 7 m, it can be cut very suitably, and the cut chips are cut into pieces, and the fiber reinforcements 5 and 6 are cut into pieces. The chamfer of the shield machine 203 was not clogged with concrete lump.

  In addition, the so-called punching shear, which escapes to the shaft side due to the pressure on the natural ground side, could be effectively prevented.

Example 2
Another embodiment of the present invention will be described with reference to FIG.

  In Example 1, although the connection method which connects the lower end of the upper piece 1A which comprises the fiber reinforced pile material 1 for shield excavation, and the upper end of the lower piece 1B was demonstrated, the long fiber excavation pile for shield excavation by a head limitation It may be necessary to further divide the material 1. In this case, the upper piece and the lower piece described in the first embodiment may have to be further connected via an intermediate connection piece.

  Referring to FIG. 10, a case where the fiber reinforced pile material 1 for shield excavation is configured by an upper piece 1A, a lower piece 1B, and an intermediate connection piece 1C is shown. In this case, the upper piece 1A and the lower piece 1B have the same configuration as described in the first embodiment. In the intermediate connection piece 1C, connection regions Hb and Ha are formed at both ends of the upper end and the lower end, respectively.

  That is, in this embodiment, the lower end of the upper piece 1A and the upper end of the intermediate connection piece 1C are connected using the connection FRP lattice line 50 by the connection method according to the present invention, and the intermediate connection piece 1C The lower end and the upper end of the lower piece 1B are connected using the connecting FRP lattice line 50 by the connecting method according to the present invention.

  The connection method is performed in the same manner as described in the first embodiment. Members having the same configuration and function are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the present embodiment, a vertical wall using a long shield excavation fiber-reinforced pile material 1 having a plurality of connection structures having the same configuration is connected at a plurality of connection locations.

  Also in the present embodiment, the same operational effects as those of the first embodiment can be achieved.

DESCRIPTION OF SYMBOLS 1 Fiber reinforcement pile material for shield excavation 1A Upper piece 1B Lower piece 1C Intermediate connection piece 5 Fiber-reinforced resin lattice member (reinforcing FRP lattice)
5A Mass 6 Fiber-reinforced resin reinforcing material (FRP stirrup)
10A Connection structure of fiber reinforced pile material for shield excavation 20 Coating material 50 Fiber-reinforced resin lattice-like member (FRP lattice for connection)
50A cell 60 molding frame 71 reinforcing aggregate H connection area Ha upper connection area Hb lower connection area

Claims (9)

A cross-sectional shape orthogonal to the longitudinal axis is a rectangular shape, and is a long and slender shape fiber reinforced pile material for shield excavation reinforced with reinforcing FRP lattices, and a plurality of pieces in the longitudinal direction In the connection method for connecting the fiber reinforced pile material for shield excavation divided into a single piece in the longitudinal direction at the site,
The upper piece located on the upper side has an upper connection region where the reinforcing FRP lattice is exposed at the lower end,
The lower piece located on the lower side has a lower connection region where the reinforcing FRP lattices are exposed at the upper end,
Aligning the upper piece and the lower piece in the longitudinal axis direction, joining the lower end of the upper piece and the upper end of the lower piece,
Fitting and overlapping the connecting FRP lattices to overlap the exposed reinforcing FRP lattices at the lower end of the upper piece and the exposed reinforcing lattices at the upper end of the lower piece,
FRP stirrup bars are arranged on the outer periphery of the upper connection area of the upper piece in which the connection FRP lattice bars are disposed and the lower connection area of the lower piece in which the connection FRP lattice lines are disposed. And
A molding die is attached so as to surround the upper connection region of the upper piece and the lower connection region of the lower piece, a covering material is placed in the molding die, and the covering material is attached to the reinforcing FRP. Filling the grids and grids of the connecting FRP grids, covering the outer periphery of the upper connection region of the upper piece and the lower connection region of the lower piece, and solidifying the coating material;
A method for connecting a fiber-reinforced pile material for shield excavation.   2. The shield excavation material according to claim 1, wherein the shield excavation fiber-reinforced pile material divided into the plurality of pieces is a precast material using concrete, mortar, or foamed resin as a matrix material. How to connect fiber reinforced piles.   The said covering material is concrete, mortar, or resin mortar, The connection method of the fiber reinforced pile material for shield excavation of Claim 1 or 2 characterized by the above-mentioned.   The method for connecting a fiber reinforced pile material for shield excavation according to any one of claims 1 to 3, wherein the molding form is wood, resin material, FRP material, or FRU material.   5. The fiber reinforced pile material for shield excavation according to claim 1, wherein a reinforcing aggregate is filled in advance in the grids of the reinforcing FRP lattice and the connecting FRP lattice. Connection method.   6. The fiber reinforced pile material for shield excavation according to claim 5, wherein the reinforcing aggregate is an aggregate such as ordinary crushed stone, lime crushed stone, slag crushed stone, resin material, FRP material, or FRU material. Connection method. The FRP lattice line and the stirrup line are fiber reinforced resin materials obtained by impregnating a reinforced fiber with a resin,
Examples of the reinforcing fibers include inorganic fibers such as carbon fibers, glass fibers, ceramic fibers, boron fibers, and basalt fibers; metal fibers such as titanium and steel; aramid, polyester, polyethylene, nylon, vinylon, polyacetal, PBO, and high-strength polypropylene. An organic fiber such as, or a hybrid type in which a plurality of the fibers are mixed,
As the resin, at least one kind of radical reaction resin such as vinyl ester resin, unsaturated polyester resin, polyamide resin, room temperature curable epoxy resin, thermosetting epoxy resin, polycarbonate resin, urethane resin, MMA, epoxy acrylate, etc. Use what includes
The connection method of the fiber reinforced pile material for shield excavation as described in any one of Claims 1-6 characterized by the above-mentioned.   The fiber-reinforced pile material for shield excavation according to any one of claims 1 to 7, wherein a joining surface of the upper piece and the lower piece is formed in a cotter structure that fits in an uneven shape. Connection method.   The connection structure of the fiber reinforced pile material for shield excavation connected by the connection method of the fiber reinforced pile material for shield excavation in any one of Claims 1-8.