JP3798414B2 - Continuous fiber reinforced member for concrete wall to be cut and construction method of concrete wall to be cut using the same - Google Patents

Description

  The present invention relates to a continuous fiber reinforced member for a concrete wall to be cut for use as a retaining concrete wall in a shield tunneling machine start reaching part in a tunnel tunneling shaft that can be cut by a shield tunneling machine, and to-be-cut concrete using the same It is related with the construction method of the wall.

FIG. 32 shows a state where the shield machine 2 is propelling the opening 47 cut and formed by manual work on the retaining wall 46 reinforced by the reinforcing bars 44 and the H-shaped steel 45. FIG. 33 shows a conventional example in which a tensile reinforcing material 48 made of a CFRP continuous fiber reinforcing member is arranged in advance in a precast concrete 51 and used as a cut retaining wall 49.
In the general example of FIG. 32, since the shield machine 2 cannot directly cut the reinforcing bar 44 or the H-shaped steel 44, after the ground improvement 50 is applied behind the retaining wall 46, the suspended work of the retaining wall 46 once constructed is manually performed. After that, the laborious method of setting the excavator 2 in the opening 47 was unavoidable.
In the example of FIG. 33, the continuous fiber reinforcing member 48 is disposed in the precast concrete and is a cutable earth retaining wall 49, and the continuous fiber tensile reinforcing material 48 disposed on the natural ground side depending on conditions is used for the shield machine 2. When the precast concrete 51 with the covered part is broken into large lumps and cut into the back ground, together with the surrounding weak cast-in mortar (or concrete) 52, etc. Was left.
The conventional example will be further described with reference to FIG. 31. FIG. 31 shows a state in which the shaft 1 is built at a position to be a base for tunnel excavation work, and the shield machine 2 is installed at the bottom of the shaft 1.

  As shown in the figure, when this shaft 1 is constructed, after excavating an annular excavation groove, reinforcing bars are placed on the lower floor and side walls of the excavation groove, and concrete is placed in that part, A concrete wall 3 that can withstand the earth pressure is constructed.

  The shield machine 2 is assembled on a cradle provided in the shaft 1 so as to be installed at a predetermined position. In the concrete wall 3, the part 4 that the shield machine 3 propels is configured to be easily demolished by the shield machine 2, for example, the streaks of the concrete wall 3 in this part 4. For example, a continuous fiber reinforcing member formed by impregnating a resin with carbon fiber, glass fiber, or aramid fiber, which has almost the same strength as a reinforcing bar and can be easily cut and broken by the excavating ability of the shield machine 2 is used. It is done.

As means for providing a retaining wall body that can be directly cut with a cutter bit of a shield machine as described above, those already described in Patent Document 1, Patent Document 2, and the like are known. In addition, due to the congestion of underground buried objects and interference with surrounding structures, it is increasingly necessary to assemble this retaining wall under the road, and as a countermeasure, it can be carried into the road construction site. Japanese Patent Application Laid-Open No. 6-81576, Japanese Patent Application Laid-Open No. 6-108657, Japanese Patent Application Laid-Open No. 6-133706, and Japanese Patent Application Laid-Open No. 6-137066 are provided as a method for sequentially connecting short concrete walls, and a structure therefor. The structures described in the publications and the like and methods for connecting them have been invented, and some of them have already been put into practical use.
Japanese Patent Publication No. 6-37830 JP-A-5-302490

  In the above-mentioned earth retaining wall body, a reinforcing material for reinforcing the concrete is used. As described above, the reinforcing material in the propulsion part 4 of the shield machine 2 is reinforced in the axial direction so that it can be directly cut with a cutter bit. In some cases, a reinforcing material made of a continuous fiber reinforcing member such as a fiber reinforced resin (CFRP) using mainly carbon fiber as a fiber is used as a concrete reinforcing reinforcing material.

  Carbon fiber is most suitable as a fiber for such purposes because it is easy to obtain CFRP with a high modulus of elasticity comparable to that of reinforcing steel, has excellent machinability, and has no danger of being attacked by concrete alkali like glass fiber. It is.

  However, it is allowed to use glass fibers and aramid fibers in combination for the purpose of providing an auxiliary function even in the fiber orientation other than the axial direction and in the axial direction. Thus, even if glass fiber, aramid fiber, or the like is used in combination, CFRP is used as long as the main component of the reinforcing material in the axial direction, that is, in the tensile direction is carbon fiber.

  It is necessary to fix these tensile reinforcement materials in order to connect plate reinforcements made of CFRP such as plates, tubes, rods, and stranded wires, or to transfer stress by connecting the ends to other materials. It is. In addition, all materials used for this fixing must be made of materials that can be cut with a cutter bit of a shield machine and have a strength that matches the outstanding tensile strength of CFRP. In addition, when applied to road construction at the time of shaft construction, the construction method cannot be excellent in practicality unless a complicated and skilled work process is avoided.

  Conventionally, joints of these tensile reinforcements have been developed using fluid materials and those made of FRP bolts, and some of them have been put into practical use. On the other hand, the former involved complicated work requiring special attention, such as confirmation of filling and a temporary fixing process within the curing time, and the latter, such as bolt tightening torque management.

  Furthermore, it was easy to happen that the strength of the tensile reinforcement material could not be fully exhibited due to structural and construction restrictions of the anchorage.

  On the other hand, in order to realize the fiber orientation parallel to the H-shaped cross section at the joint between the web and the flange, there is only a method of laminating the prepregs by hand, and the practicality is low because the productivity is remarkably low. It was extremely scarce.

  An object of this invention is to provide the construction method of the to-be-cut concrete wall using the continuous fiber reinforcement member for the to-be-cut concrete wall which solved the said various problems.

In order to solve the above-mentioned problems, a continuous fiber reinforcing member for a concrete wall to be cut to which the present invention is applied is composed of a hollow cylinder whose cross section expands downward, and the hollow cylinder is made of carbon fiber. It is characterized by comprising a fiber reinforced resin mainly composed of
In addition, the method for constructing a concrete wall to be cut by the continuous fiber reinforcing member to which the present invention is applied is a temporary support member that uses a steel shaft component member suspended and supported in an excavation groove filled with muddy water. A plurality of hollow cylinders made of fiber reinforced resin mainly composed of carbon fibers are stacked in multiple stages through the taper portion, with a hollow cross section on the member and expanding in the downward direction. Then, each hollow cylinder is suspended in the excavation groove in order to form a hollow continuous muscle that is non-removably fitted, and concrete or mortar is connected to the hollow portion of the hollow continuous muscle via a tremy tube. The construction method of the concrete wall to be cut is filled with the pressure of the upper and lower hollow cylinders by the pressure acting from the inside to the outside of each hollow cylinder due to the difference in specific gravity between this concrete or mortar and the muddy water outside the hollow continuous muscle. Friction of taper overlap Wherein the engagement is increased.
According to the present invention, a continuous fiber reinforcing member of a limited length is added in the longitudinal direction in a limited place in the construction space, and the length is increased while sequentially adding without damaging the tensile strength at the joint. A long hollow continuous muscle body or a long reinforcing muscle body can be formed. Moreover, the concrete wall reinforced by the streaks has the necessary strength and can be easily cut with the cutter bit of the shield machine.

  According to the present invention, a continuous wall reinforcing member having a limited length is connected even in a limited space in the construction space, and is continuously reinforced without damaging the tensile strength of the joint portion. Can be built. The concrete wall constructed in this way can be easily cut with a cutter bit of a shield machine because the continuous fiber reinforcing member and its joint are all made of a material that can be cut with CFRP as the center. Furthermore, at the both ends of the concrete wall constructed in this way, the place deviated from the start reach of the shield machine is a steel structure or a reinforced concrete structure, but the concrete wall of the present invention and the steel structure or the reinforced concrete structure Joining can also be easily and firmly performed by a support member, an engaging member, an attachment plate, a bolt, a nut, or the like provided in the steel structure.

The present invention will be described below with reference to the drawings.
1 to 9 show a first example of the present invention. In each figure, a steel bearing member 6 provided at the upper end of the lower steel shaft constituent member 7 made of H-shaped steel and a steel engaging member 6a provided at the lower end of the upper steel shaft constituent member 7a. A concrete wall 8 to be cut according to the present invention is disposed between the two.

  The concrete wall 8 has a plurality of cylindrical bodies 9 having a hollow cross section that expands in the downward direction and is stacked in multiple stages in the vertical direction via the tapered portion 10, and the frictional force acting on the tapered portion 10. The inside and outside of the hollow continuous muscle body 11 that is configured to be non-removably fitted to the tensile force is filled with mortar or concrete.

  This concrete wall 8 corresponds to the propulsion part 4 of the reinforced concrete wall 3 in the vertical shaft 1 of the shield method shown in FIG. 31, and the area 12 is cut by the shield machine 2 in FIG. The excavator 2 propels through this range 12.

  More specifically, in the first example, the hollow cylindrical body 9 constituting the hollow continuous muscle 11 is composed of carbon fiber mainly from continuous fiber reinforced resin (CFRP), and the cross section thereof is shown in each drawing. Further, the taper angle θ of the taper portion 10 is sufficient when the plurality of hollow cylinders 9 are stacked at the construction site. The taper angle (for example, tan θ = 0.002 to 0) that can be overlapped so that the hollow cylinder 9 positioned on the tension side does not come out from the other side due to the effect of a large frictional force acting on the taper portion. .About.05) is preferred.

  The tapered portion 10 is formed on the inner and outer surfaces of at least two opposing walls of the hollow cylinder having a substantially rectangular cross section, and preferably, the tapered portion 10 is formed on the inner and outer surfaces of each of the four walls. Thus, the fitting of the upper and lower hollow cylinders 9 is strong and reliable. In addition, 10a is a taper outer surface and 10b is a taper inner surface. In the case of this example, the hollow cylinder 9 is expanded (expanded in diameter) in a similar shape from the upper end to the lower end while the thickness of the cross section of the hollow cylinder 9 is constant.

  10, 13, and 14 show modified examples in which the cross-sections of the hollow cylinders are different from each other. In the hollow cylinder 9 a of FIG. 10, a substantially rectangular shape in which the tip part is an acute angle part 14 is shown. The hollow cylinder 9b in FIG. 13 has a configuration having a circular section 15 in cross section, and in FIG. 14, the hollow cylinder 9c has a flat rectangular shape 16 on four sides. The cross-sectional shape of the CFRP hollow cylinder 9 may be an ellipse, a polygon with rounded corners, or a combination thereof as long as it is hollow.

  As shown in FIGS. 7, 10, 13, and 14, the hollow cylindrical bodies 9, 9a, 9b, and 9c are stacked in multiple stages vertically by overlapping the taper portions 10, and are long and hollow. A continuous muscle body 11 is formed. At this time, when a tensile force accompanying a bending moment is applied to one side of the taper overlapping portion of the hollow continuous muscle 11, a compressive force equal to the tensile force is applied to the other side of the taper overlapping portion. If θ is somewhat small, the taper overlap length is secured to some extent, and the inside and outside of the hollow cylinders 9, 9a,... are constrained by a solidified body such as concrete or mortar, the overlap once formed The combined hollow cylinder 9 does not come out.

  The hollow continuous reinforcement 11 having a fitting structure with the tapered portions of the hollow cylinders 9, 9a,... As described above is particularly advantageous when used as a reinforcing material for a shaft retaining wall where axial force is applied. Further, by forming irregularities (not shown) on the surfaces other than the tapered surface overlapping surface of the hollow cylinders 9, 9a,..., The hollow cylinders 9, 9a,. It can also be a composite structure with solidified material such as concrete or mortar.

  As described above, the steel shaft constituent members 7 and 7a made of H-shaped steel of the portion connected to the upper and lower ends of the hollow continuous reinforcing bars 11 formed by stacking a plurality of hollow cylindrical bodies 9 in multiple stages. As shown in FIG. 1, the steel support member 6 and the steel engagement member 6 a having the same taper cross-sectional shape as that of the hollow cylindrical body 9 are fixed to the lower end edge and the upper end edge.

A process for carrying out the concrete wall reinforcing method of the present invention will be described with reference to FIGS.
In the excavation groove 17 filled with muddy water, this is achieved by engaging the suspension fitting 22 at the lower end of the suspension rope 21 with the suspension fitting 20 of the bracket 18 provided at the upper end of the steel shaft component 7. The steel shaft member 7 is suspended and temporarily held at a predetermined height by the rope 21. Subsequently, the steel support member 6 becomes a temporary support member, and has a tapered portion 10 whose lower side is expanded on the outside of the steel support member 6 and is made of a fiber reinforced resin mainly made of carbon fiber. The hollow cylinder 9 is fitted from above. It is held in that state.

  On the hollow cylinder 9, the next hollow cylinder 9 is further fitted. Correspondingly, while the steel shaft constituent members 7 are sequentially lowered below the excavation grooves 17, In order to form the hollow continuous reinforcing body 11 for a concrete wall to be crushed as shown in FIG. As shown in FIG. 1, a plurality of rows of the hollow continuous muscle bodies 11 are arranged side by side.

  As shown in FIG. 3, after the hollow continuous muscle body 11 is constructed to a predetermined length, a tremy tube 23 is inserted into the hollow continuous muscle body 11 from above, and the hollow continuous muscle body 11 is continuously hollow from the tip of the tremy tube 23. Concrete or mortar 24 is filled into the internal space of the muscular body 11.

  And since the hollow continuous muscle 11 is constructed in the excavation groove 17 filled with the mud water 25, before replacing the mud outside the hollow continuous muscle 11 with concrete or mortar, the tremy tube The hollow cylindrical body is filled with the concrete or mortar 24 in the hollow continuous muscle body 11 by the difference in specific gravity between the muddy water 25 outside the hollow cylindrical body 9 and the concrete or mortar 24 in the hollow part. In the taper overlapping portion 9, a pressure from the inner side to the outer side of the hollow cylinder 9 acts. This pressure is advantageous because it works to increase the frictional force of the taper portion of the overlapping portion. Further, since the muddy water discharge hole 43 is provided on the bottom surface of the steel support member 6, the concrete or the mortar 24 is smoothly filled into the hollow cylindrical body 9 by letting air escape from the muddy water discharge hole 43.

  After filling the hollow continuous muscle 11 with concrete or mortar 24 as described above, the tremy tube 23 is pulled up, and the mud water 25 outside the hollow cylinder 9 is replaced with concrete or mortar 42 as shown in FIG. Thus, a concrete wall 8 such as concrete for cutting or mortar reinforced by the hollow continuous muscle 11 can be configured, and the concrete wall 8 becomes a retaining wall, and the inside surrounded by the retaining wall is excavated. As a result, the shaft 1 as a base for the tunnel excavation work is constructed.

  8, 9, 11, and 12 show a process in which the shield machine 2 installed in the vertical shaft 1 cuts and propels the cutting concrete wall 8. 8 and 9 are examples in which the cutting concrete wall 8 is constituted by a hollow cylinder 9, and in this case, the inner end of the hollow cylinder 9 by the cutter bit 2 a accompanying the propulsion of the shield machine 2. The hollow continuous streaks 11 formed by laminating the hollow cylinders 9 in layers are cut sequentially, and an opening is formed in the concrete wall 8 through which the shield machine 2 is opened. Start off.

  When the hollow cylinders 9, 9 a are sequentially cut as shown in FIGS. 8 to 9 and FIGS. 11 to 12 by the cutter bit 2 a of the shield machine 2, the side that remains to the end, that is, the tip of the hollow cylinder 9 9 is an arcuate portion 13 as shown in FIG. 9 or an acute-angled portion 14 as shown in FIG. 12, and the front end surface of the CFRP of the hollow cylinders 9 and 9a is a cutter bit 2a of the shield machine 2 However, these are shown as examples of more desirable shapes for the following reasons.

  That is, when the concrete wall 8 to be cut having a certain degree of strength is cut with the cutter bit 2a of the shield machine 2, when the cutting is close to completion, the remaining portions of the hollow cylinders 9 and 9a There is an increased risk of peeling off from a solidified body such as mortar or concrete solidified in place and falling off as a large lump. In this regard, the shape of the arc-shaped portion 13 or the acute-angled portion 14 of the hollow cylindrical body 9 avoids such inconveniences, and the concrete wall 8 to be cut to the ground or place to the end. Maintaining the state of adhering to a solidified body such as mortar solidified by punching is advantageous for enabling the hollow cylindrical bodies 9 and 9a to be cut into small pieces.

  In addition, when the hollow cylinder is cut by the shield machine, the cross-sectional shape on the side that remains until the end may be any one of ellipses, semicircles, polygons, etc., or a combination thereof. .

  Of course, the present invention is not limited to the above-described structure, and even if the distal end portion is a flat shape parallel to the face plate of the shield machine as in the hollow tube 9c shown in FIG. A remarkable effect can be achieved compared to the conventional example in that it has a feature that a large number of laminated hollow continuous muscle bodies 11 can be configured by simple construction means by stacking a large number of them.

  15 to 23 show a first reference example of the present invention, and FIGS. 24 to 30 show a second reference example of the present invention. The first example and the second reference example are different from the first example shown in FIGS. 1 to 14 in the first example. In the first example, the first example and the second reference example are made of a fiber reinforced resin mainly composed of carbon fibers. In contrast to the first and second reference examples, the fiber reinforcement mainly composed of carbon fibers is used for the continuous fiber reinforcing member for the concrete wall to be cut by the hollow cylinder 9 having a cross section that expands in diameter. A hollow cylindrical member made of resin is divided into two in the longitudinal direction, and the back portions (webs) of the divided members are joined together using a severable joining means comprising a fiber reinforced bolt and a welded plate or an adhesive. It is a point which comprises a continuous fiber reinforcement member.

  The reference first example will be described with reference to FIGS. 15 to 23. In the first reference example, as shown in FIG. 18, a carbon fiber having a hollow cross section, a polygonal shape and rounded corners is mainly used. A hollow tubular member 26 as a continuous fiber reinforcing member made of the above-described fiber reinforced resin is manufactured by filament winding (hereinafter referred to as FW). In FIG. 18, the orientation of the carbon fibers in the hollow cylindrical member 26 is indicated by arrows.

  Next, as shown in FIG. 19, the hollow tubular member 26 is vertically divided into two to form two U-shaped divided members 26a. Next, as shown in FIG. 20, the U-shaped split member 26 a is aligned with the web (back portion) 27, and is recombined with a fiber reinforced resin bolt 28 and a nut 29 penetrating the back-to-back portion. A continuous fiber reinforcing member 30 mainly composed of carbon fibers having a cross section is configured. In addition, as means for connecting the web 27 of the divided member 26a, an adhesive may be used in addition to the fiber reinforced resin bolt 28 and the nut 29, or a combination of these bolt, nut and adhesive may be used.

  If the continuous fiber reinforcing member 30 mainly composed of the carbon fiber is sufficiently long, the reinforcing member alone can be used as a reinforcing reinforcing body for the concrete wall 8 to be cut. In the case of a short length, this is coupled in the longitudinal direction as shown in FIG. This coupling means is also used for coupling the upper and lower ends of the long reinforcing bar 31 and the upper and lower steel shaft components 7 and 7a.

  Examples of the coupling means are shown in FIGS. In the case of the figure, the end edges 32 of the upper and lower continuous fiber reinforcing members 30 are butted together, and the attachment plate 33 extending across the end edges 32 is attached to the web 27 and the flange 34 of each reinforcing member 30 on both sides. The upper and lower continuous fiber reinforcements are made by inserting fiber reinforced resin bolts 28 into the bolt holes 35 of the web 27 and flange part 34 and the attachment plate 33 and fastening the nuts 29. Member 30 is coupled.

  Each continuous fiber reinforcing member 30 in the first reference example is embedded as a long reinforcing bar 31 in the concrete wall 8 to be cut as shown in FIG. 15, and a shield machine as shown in FIGS. By cutting with the cutter bit 2 a of 2, an opening through which the shield machine 2 can pass is cut and formed in the concrete wall body 8.

  Next, a second reference example shown in FIGS. 20 to 26 will be described. In this reference second example, as shown in FIG. 27, the cross-sectional shape of the hollow cylindrical member 36 is different from that of the reference first example, and other configurations and manufacturing processes are the same as those of the reference first example. The same reference numerals are given to the same elements, and the duplicate description is omitted, and only the differences will be described.

  In the second reference example, the configuration having a substantially rectangular cross-sectional shape in which the tip of the hollow cylindrical member 36 is an arc-shaped portion 37 is a rectangular cross-section in which the tip of the hollow cylindrical member 26 of the first reference example is a planar shape. The configuration is different from the configuration. Accordingly, the webs 38 of the divided member 36a formed by dividing the hollow cylindrical member 36 of the second reference example in the longitudinal direction are butted against each other, the fiber reinforced resin bolt 28 is inserted into the bolt hole 35, the nut 29 is fastened, The cross-sectional shape of the continuous fiber reinforcing member 40 formed by joining is slightly different from the continuous fiber reinforcing member 30 according to the first reference example.

  The continuous fiber reinforcing member 40 of the second reference example is also embedded as a long reinforcing bar 41 in the concrete wall 8 to be cut as shown in FIG. 24, and the shield machine 2 as shown in FIGS. The cutter bit 2a is used for cutting. At this time, the shape of the remaining portion of the continuous fiber reinforcing member 40 when the concrete wall 8 to be cut having a certain degree of strength approaches the completion of cutting by the cutter bit 2a is different from the first reference example in the second reference example. ing.

  This difference is based on the same principle described in the first example of the present invention with respect to the difference between FIGS. That is, as shown in FIG. 17, in the case of the second reference example having the arc-shaped flange 39 as shown in FIG. 26, the continuous fiber reinforced member is better than the first reference example having the flat flange 34. Since the remaining portion is small, when the opening of the concrete wall 8 is cut by the shield machine 2, the remaining portion peels off from the solidified body such as mortar or concrete constituting the concrete wall and falls off as a large lump. There is little risk to do. However, it is clear that the configuration of the first reference example can achieve a remarkable effect as compared with the conventional example.

  The reason why the present invention constitutes the continuous fiber reinforcing members 30 and 40 as in the first reference example and the second reference example is as follows.

  In the retaining wall of the shaft for starting and reaching the shield machine, H-shaped steel is often used as a reinforcing bar in the past, and in this connection, when the shield machine is started and reached, cutting is performed with the cutter bit. If the reinforcing bar body of the retaining wall in the range to be cut, that is, the range to be cut by the cutter bit, has sufficient strength as the retaining wall and is composed only of a material that can be cut, it is H-shaped. A steel having the same cross-sectional structure as that of steel is preferable because it can be easily joined with an attachment plate.

  For this reason, a continuous fiber reinforcing member having an H-shaped cross section is conventionally used as a reinforcing bar for a concrete wall to be cut. However, as described above, a conventional continuous fiber reinforcing member having an H-shaped cross section is used. However, the strength of the joint between the web forming the H-shaped cross section and the flange is so weak that it is difficult to put into practical use due to problems in the manufacturing method, or the joint between the web and the flange by manual operation of the prepreg. It was difficult to put it to practical use because of its markedly low productivity due to the bonding.

  In the present invention, when the hollow cylindrical members 26 and 36 are manufactured, the carbon fibers in the fiber reinforced resin can be oriented as expected. Therefore, the cross sections of the continuous fiber reinforcing members 30 and 40 configured by joining the webs 27 and 38 to the divided members 26a and 36a formed by dividing the hollow cylindrical members 26 and 36 into two in the vertical direction. The shape is the same H-shaped cross section as in the prior art, and the webs 27 and 38 and the flanges 34 and 39 are integral with each other, and the carbon fibers are oriented in both directions. There is no reduction in strength.

  In addition to the above-mentioned advantages, the continuous fiber reinforcing member 40 of the second reference example has the arc-shaped flange 39 as described above, which is advantageous for making the reinforcing member 40 smaller in the final cutting stage of the concrete wall 8. It has a configuration.

  In addition, the webs 27 and 38 and the flanges 34 and 39 of the long reinforcing bars 31 and 41 made of CFRP constitute synthetic beams (reinforcing bars) with concrete by providing irregularities on the openings, protrusions or surfaces. It's obvious what you can do.

  When manufacturing the hollow cylinder shown in FIG. 1 to FIG. 14, FIG. 18 and FIG. 27, the longitudinal direction of the cylinder (as shown in FIG. A continuous fiber mainly composed of carbon fibers in the direction (arrow X direction in FIG. 18), the circumferential direction of the cylinder (arrow Y direction), and the direction (arrow Z direction) inclined and intersected with the longitudinal direction of the cylinder. May be arranged in appropriate combination. Further, continuous fibers such as carbon fibers may be wound many times or spirally in the circumferential direction of the hollow cylinder and embedded with resin or impregnated with resin.

It is front explanatory drawing which shows the example which implemented the 1st example of this invention to the concrete wall for cutting of the shield machine propulsion part in a vertical shaft. It is sectional drawing which shows the 1st process at the time of multistage loading of the hollow cylinder of fiber reinforcement which concerns on the 1st example of this invention. It is sectional drawing which similarly shows a 2nd process. It is sectional drawing which similarly shows a 3rd process. It is a longitudinal cross-sectional view of the hollow cylinder which concerns on a 1st example. It is AA sectional drawing of FIG. It is a perspective view of the multistage loading state of the hollow cylinder concerning the 1st example. It is a cross-sectional view which shows the state before the cutting | disconnection by the shield machine of the fiber reinforcement reinforcement body which consists of a hollow cylinder which concerns on a 1st example. It is a cross-sectional view which shows the state at the time of completion | finish of a cutting | disconnection by the shield machine of a fiber reinforcement reinforcement body similarly. It is a perspective view which shows the multistage loading state of the 1st modification of the hollow cylinder which concerns on the 1st example of this invention. It is a cross-sectional view which shows the state before the cutting | disconnection by the shield machine of the fiber reinforced reinforcement body which consists of a hollow cylinder which concerns on the 1st modification of a 1st example. It is a cross-sectional view which shows the state at the time of completion | finish of the cutting | disconnection by the shield machine of the fiber reinforcement reinforcement body of FIG. It is a perspective view of the multistage loading state of the 2nd modification of the hollow cylinder concerning the 1st example of the present invention. It is a perspective view of the multistage loading state of the 3rd modification of the hollow cylinder concerning the 1st example of the present invention. It is front explanatory drawing which shows the example which implemented the reference 1st example of this invention on the concrete wall of the shield machine propulsion part in a vertical shaft. It is a cross-sectional view which shows the state before the cutting | disconnection by the shield machine of the fiber reinforced reinforcement body which consists of a division member of the hollow cylindrical member which concerns on a reference 1st example. It is a cross-sectional view which shows the state at the time of completion | finish of the cutting | disconnection by the shield machine of the fiber reinforcement reinforcement body of FIG. It is a perspective view of the hollow cylindrical member concerning a reference 1st example. FIG. 19 is a perspective view of the hollow cylindrical member of FIG. 18 in a two-divided state. FIG. 20 is a perspective view of a fiber reinforced reinforcing member formed by rejoining the divided member of FIG. 19 via a web. It is sectional drawing of FIG. It is a front view which shows the connection part of the longitudinal direction of the fiber reinforcement reinforcement body of FIG. It is sectional drawing of the connection part of FIG. It is front explanatory drawing which shows the example which implemented the reference 2nd example of this invention on the concrete wall of the shield machine propulsion part in a vertical shaft. It is a cross-sectional view which shows the state before the cutting | disconnection by the shield machine of the fiber reinforced reinforcement body which concerns on the reference 2nd example of this invention. It is a cross-sectional view which shows the state at the time of completion | finish of a cutting | disconnection by the shield machine of a fiber reinforcement reinforcement body similarly. It is a perspective view of the hollow cylindrical member which concerns on the reference 2nd example. FIG. 28 is a perspective view of the hollow cylindrical member of FIG. 27 in a two-divided state. FIG. 29 is a perspective view of a fiber reinforced muscle body formed by rejoining the divided members of FIG. 28 back to back. FIG. 30 is a cross-sectional view of FIG. 29. It is side explanatory drawing which shows the shield machine in a shaft as a 1st prior art example, and the concrete wall in the propulsion part. It is sectional explanatory drawing which shows the state which is pushing the opening excavated by the suspension operation | work by the manpower as a 2nd prior art example. It is side explanatory drawing which shows the state which the shield excavation machine in a vertical shaft cuts and promotes the fiber reinforced earth retaining wall as a 3rd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vertical shaft 2 Shield machine 3 Concrete wall body 4 Propulsion part 6 Steel bearing member 6a Steel engaging member 7, 7a Steel shaft structural member 8 Concrete wall body for cutting 9, 9a, 9b, 9c Hollow cylinder (continuous Fiber reinforcement member)
DESCRIPTION OF SYMBOLS 10 Tapered part 11 Hollow continuous muscle body 12 Range 13 Arc-shaped part 14 Acute-angled part 15 Cross-sectional circular part 16 Rectangular part 17 Excavation groove 18 Bracket 20 Hanging bracket 21 Hanging rope 22 Hanging bracket 23 Tremy tube 24 Concrete or mortar 25 Muddy water 26 Hollow cylindrical member 26a Dividing member 27 Web 28 Fiber reinforced resin bolt 29 Nut 30 Continuous fiber reinforcing member 31 Long reinforcing bar 32 End edge 33 Attachment plate 34 Flange 35 Bolt hole 36 Hollow cylindrical member 36a Dividing member 37 Arc-shaped portion 38 Web 39 Flange 40 Continuous fiber reinforcing member 41 Long reinforcing bar body 42 Mortar or concrete 43 Mud drainage hole 44 Reinforcing bar 45 H-shaped steel 46 Earth retaining wall 47 Opening portion 48 Tensile reinforcing material 49 Earth retaining wall 50 Ground improvement 51 Precast concrete 52 Cast-in-place mortar

Claims (3)

A continuous fiber reinforced member for a concrete wall to be cut, characterized in that it has a hollow cylinder whose cross section expands downward, and this hollow cylinder is made of a fiber reinforced resin mainly composed of carbon fibers. A plurality of the hollow cylinders are stacked in multiple stages in the vertical direction via the taper portion, and are fitted non-detachably with respect to a tensile force by a friction force acting on the taper portion, so that a hollow continuous muscle body is obtained. 2. The workpiece according to claim 1, wherein a cross section of each of the hollow cylinders is a circle, an ellipse, a polygon having round corners, or a combination thereof. Continuous fiber reinforced member for concrete walls. In the excavation groove filled with muddy water, the steel shaft constituent member suspended and supported is used as a temporary receiving member, and the horizontal cross section is hollow on the temporary receiving member, and the diameter is expanded downward. A plurality of hollow cylinders formed from fiber reinforced resin mainly composed of fibers are sequentially suspended in the excavation groove while being stacked in multiple stages via the tapered portions, so that each hollow cylinder is non-detachable. A method for constructing a concrete wall to be cut, in which a hollow continuous muscle body is formed, and the hollow portion of the hollow continuous muscle body is filled with concrete or mortar through a tremy tube, the concrete or mortar, and a hollow The frictional coupling between the taper overlapping portions of the upper and lower hollow cylinders is increased by the pressure acting from the inside to the outside of each hollow cylinder due to the difference in specific gravity with the muddy water outside the continuous muscles. Cutting concrete wall Method.

Images