JP3665412B2 - Concrete wall reinforcement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention is for use on a retaining concrete wall of a shield machine start reach in a tunnel digging shaft that can be cut by a shield machine.The present invention relates to a reinforcing material for a concrete wall, a concrete wall, a joint structure of continuous fiber reinforced shafts, and a connection method of continuous fiber reinforced shafts.
[0002]
[Prior art]
FIG. 27 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.
[0003]
As shown in the figure, this shaft 1 is finished with excavation of the soil in the shaft, and then rebars are placed on the lower floor and side walls, and concrete is placed on that part, and the surrounding earth pressure is adjusted. A durable concrete wall 3 is built.
[0004]
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 2 propels is configured to be easily demolished by the shield machine 2, for example, the reinforcing material of the concrete wall 3 in this part 4. For example, a continuous fiber reinforcement made 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 destroyed by the excavating ability of the shield machine 2, is used. It is done.
[0005]
As means for providing a retaining wall body that can be directly cut with the cutter bit of the shield machine as described above, those already described in Japanese Patent Publication No. 6-37830, Japanese Patent Laid-Open No. 5-302490, etc. are known. ing. 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. 6-107779, Japanese Patent Application Laid-Open No. 6-133706, Japanese Patent Application Laid-Open No. 6-137066, and the like. 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.
[0006]
[Problems to be solved by the invention]
In the above-mentioned retaining wall, a reinforcing material for reinforcing the concrete is used, and this reinforcing material is a fiber reinforced resin mainly using carbon fiber as an axial reinforcing fiber so that it can be directly cut with a cutter bit. A reinforcement made of continuous fiber reinforcement such as (CFRP) may be used as a concrete reinforcement reinforcement.
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 fiber orientation other than the axial direction and for the purpose of providing an auxiliary function even 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.
[0007]
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.
[0008]
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.
[0009]
  The present invention is a method of connecting a CFRP tensile reinforcement member using only an FRP cylindrical auxiliary member without using any flowable material or FRP bolts, and requires no skill in connection work and reliable construction. HighAn object of the present invention is to provide a reinforcing material for a concrete wall, a concrete wall, a joint structure of continuous fiber reinforced shafts, and a connection method of continuous fiber reinforced shafts.
[0010]
[Means for Solving the Problems]
  In order to solve the above-described problems, a reinforcing material for a concrete wall to which the present invention is applied has an upper bulging connection portion having a taper portion expanding upward and a lower swelling having a taper portion expanding downward. A continuous fiber reinforced shaft body made of a fiber reinforced resin having upper and lower portions connected to the upper and lower portions is connected to the upper and lower portions, and the connecting portion is restrained so as not to be detached using a restraining member.
  Moreover, the reinforcing material for concrete walls to which the present invention is applied widens upward in order to solve the above-described problems.As the upper bulging connection partThe taper surface of the arc-shaped widened portion in the cross section and the width is expanded downward.As the downward bulging connection partA plate-like continuous fiber reinforced shaft body made of fiber reinforced resin having a taper surface of a cross-section arc-shaped widened portion at the upper and lower portions, respectively, is connected to the upper and lower sides, and arranged annularly at a predetermined interval, The taper surfaces of the upper and lower cross-sectional arc-shaped widened portions are engaged with each other.RingIt is set as the structure restrained so that it cannot detach | leave using a restraint member.
  Moreover, the reinforcing material for concrete walls to which the present invention is applied has a tapered outer surface that expands upward in order to solve the above-described problems.As the upper bulging connection partIt has a conical fixing part and a tapered outer surface that expands downward.As the lower bulging connection partA rod-like continuous fiber reinforced shaft body made of fiber reinforced resin having conical fixing portions at the upper and lower portions thereof is connected to the upper and lower sides by bringing the end faces of the conical fixing portions into contact with each other, and the upper and lower portions. The conical fixing portion is surrounded by a divided cylindrical constraining member having an enlarged diameter tapered hole, and is integrally held.
  Moreover, the concrete wall body to which the present invention is applied is characterized in that a plurality of reinforcing bars composed of the continuous fiber reinforced shafts are arranged and embedded in the concrete.
Moreover, the joint structure of the continuous fiber reinforced shaft body to which the present invention is applied includes an upper bulging connection portion having a taper portion that expands upward, and a lower bulge connection portion having a taper portion that expands downward. The continuous fiber reinforced shafts made of fiber reinforced resin having the upper and lower portions are connected vertically, and the connected portions are restrained so as not to be detached by the restraining members, or the connecting portions are divided cylindrical restraining members. It is characterized by being surrounded and integrally held.
  Moreover, the connection method of the continuous fiber reinforcement shaft body to which this invention is applied WHEREIN: In order to solve the subject mentioned above, the upper bulging connection part which has a taper part which expands upwards, and the taper part which expands downwards A continuous fiber reinforced shaft body made of a fiber reinforced resin having a lower bulging connecting portion having upper and lower portions is connected vertically, and the connecting portion isRingBy using a restraining member to restrain it so as not to be detached, a reinforcing material for a concrete wall to be cut is obtained.
  Moreover, the connection method of the continuous fiber reinforcement shaft body which applied this invention is provided in the lower part of the lower part of the plate-like continuous fiber reinforcement shaft body which consists of fiber reinforcement resin located in order to solve the subject mentioned above. Widen towardAs the lower bulging connection partThe taper surface of the cross-section arc-shaped widened portion and the width widened upward provided on the upper part of the plate-like continuous fiber reinforced shaft body made of fiber reinforced resin located in the lower part.As the upper bulging connection partEngage the taper surface of the arc-shaped widened portion with the cross section, andRingA restraint member is used to restrain the material from being removed so as to be a reinforcing material for a concrete wall to be cut.
  Moreover, the connection method of the continuous fiber reinforcement shaft body to which this invention is applied toward the downward direction provided in the lower part of the rod-shaped continuous fiber reinforcement shaft body which consists of a fiber reinforced resin located in order, in order to solve the subject mentioned above. Has a tapered outer surface that expands in diameterAs the lower bulging connection partA conical fixing portion and a tapered outer surface that expands toward the upper side provided at the upper portion of a rod-like continuous fiber reinforced shaft body made of a fiber reinforced resin located in the lower part.As the upper bulging connection partThe end surfaces of the conical fixing portions are brought into contact with each other so as to be connected vertically, and the upper and lower conical fixing portions are surrounded by a divided cylindrical restraining member having an enlarged diameter taper hole in the middle so as to be integrally held. Hold it as a reinforcing material for the concrete wall to be cut.
[0011]
According to the present invention, continuous fiber reinforced shafts of a limited length are added in the longitudinal direction in a limited place in the construction space, and the connections are quickly and sequentially added without damaging the tensile strength at the joint. However, it is possible to configure the muscle material. Moreover, the concrete wall reinforced with the reinforcing bar has a required strength and can be easily cut with a cutter bit of a shield machine.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
  The present invention will be described below with reference to the drawings.
  1 to 9 show a first example of the present invention. In FIG. 1, a plurality of concrete is provided between a steel bearing plate 6 provided at the upper end of the lower steel shaft member 7 and a steel bearing plate 6a provided at the lower end of the upper steel shaft member 7a. A single wall 8 is laminated and a continuous fiber reinforced shaft 10 made of fiber reinforced resin is connected to each other using a reinforcing material 11 that is connected in the vertical direction to form a concrete wall 8a for destruction. ing. This concrete wall 8a isFIG.The area 12 corresponds to the propulsion part 4 of the reinforced concrete wall 3 in the vertical shaft 1 of the shield method shown in FIG.
[0013]
Next, the joint structure of the continuous fiber reinforced shaft body 10 constituting the main element of the present invention will be described in the following order.
The continuous fiber reinforced shaft body 10 made of carbon fiber reinforced resin has an arcuate cross section in which an intermediate portion 13 has a predetermined width and length, and widens at a predetermined inclination angle upward and downward at the upper and lower ends, respectively. It has a widened portion 14 and a cross-section arc-shaped widened portion 14a that widens downward at a predetermined inclination angle as described above.
[0014]
Further, the continuous fiber reinforced shaft body 10 is provided in a plurality (three in the illustrated example) in an annular arrangement with a predetermined interval, and is disposed so as to be connected in the vertical direction. The taper surfaces 15 and 15 on both sides of each of the arc-shaped widened portions 14 and 14a located in the cross section are connected so as to engage with each other.
[0015]
In addition, in order to maintain the engagement state of the tapered surfaces 15 and 15, a restraining member is used, and in the case of the illustrated example, the restraining member is constituted by a pair of an inner cylinder 16 and an outer cylinder 17. A plurality of inner cylinders 16 are used in the vertical direction, and only the innermost cylinder 16 at the lowermost end may be made of steel, but the other inner cylinders 16 need to be FRP. Further, the outer cylinder 17 is embedded in the precast concrete wall unit 8 as shown in FIG. That is, in the illustrated example, the single concrete wall 8 is made of precast, and has a hollow hole 18 through which a plurality of continuous fiber reinforced shafts 10 arranged in an annular shape are inserted. The holes 18 are embedded at the upper and lower end portions.
[0016]
That is, in the constraining member composed of the inner cylinder 16 and the outer cylinder 17, the upper and lower transverse cross-section arc-shaped widened portions 14 and 14a in which the tapered surfaces 15 of the plurality of continuous fiber reinforced shaft bodies 10 in the annular arrangement are engaged with each other. The inner cylinder 16 having the same diameter as the inner cylinder 16 is disposed on the inner side, and the outer cylinder 17 is fitted on the outer side. Movement is restrained. Along with this, both the reinforcing shafts 10 are coupled by the engagement of the two tapered surfaces 15 with respect to the tensile force in the vertical direction of the upper and lower fiber reinforced shafts 10, and a plurality of upper and lower reinforcements are coupled. The shaft body 10 is integrated into a single reinforcing material 11, and a force is transmitted in the vertical direction.
[0017]
More specifically, as described above, except for the concrete wall 8 to be destroyed to be excavated and destroyed by the shield machine, it is composed of steel shaft components 7 and 7a using H-shaped steel, As shown in FIG. 3, steel bearing plates 6 and 6a are fixed to the upper and lower edges of the steel shaft components 7 and 7a located at the upper and lower peripheral edges of the single body 8, respectively.
[0018]
On the lower steel bearing plate 6, two sets of right and left fixing portions 20 are provided to connect and fix the lower ends of the two reinforcing bars 11 shown in FIG. 3. In this fixing portion 20, a circular hole 21 is formed, and a steel shaft having a cross-sectional arc-shaped widened portion 22 that widens upward at the upper end with an equiangular interval around the circular hole 21. The lower end of the body 23 is welded.
[0019]
The construction order of each member in the above configuration will be described. The rope 25 is obtained by engaging the suspension fitting 26 at the lower end of the suspension rope 25 with the suspension fitting 24 at the four corners of the steel bearing plate 6 in the shaft. Thus, the steel shaft constituent member 7 is suspended and temporarily held at a predetermined height. Subsequently, the first-stage concrete wall 8 made of precast having a height substantially the same as the length of the continuous fiber reinforced shaft body 10 is suspended on the upper surface of the steel bearing plate 6 so that the lower end of the precast cast concrete wall 8 is in contact with the upper surface. I will give you.
[0020]
At this time, the outer cylinder 17 embedded in the lower end portion of the concrete wall unit 8 is fitted to the outer side of the annularly arranged steel shaft body 23, whereby the steel shaft body 23 is restrained and does not expand in diameter.
[0021]
Next, in the state of FIG. 2, three continuous fiber reinforced shafts 10 are inserted through the hollow holes 18 of the single concrete wall 8, and the tapered surface 15 of the cross-section arc-shaped widened portion 14a at the lower end thereof is replaced with a steel shaft. 23 is engaged with the tapered surface 15 of the arc-shaped widened portion 22 of the cross section, and is temporarily held in this state.
[0022]
Subsequently, the inner cylinder 16 is inserted inside the continuous fiber reinforced shaft body 10 in the annular arrangement, and is lowered to a height position corresponding to the outer cylinder 17 at the lower end of the concrete wall unit 8, and the circular hole of the steel bearing plate 6 21 is engaged with the end edge. Thereby, the inner cylinder 16 also restrains the movement of the continuous fiber reinforced shaft body 10 to the inside, and the restraint of the engaging portion becomes more reliable, and the upper and lower continuous fiber reinforced shaft bodies 10 are integrated.
[0023]
Next, as shown in FIG. 3, the second-stage concrete wall single body 8 is placed on the first-stage concrete wall single body 8, and the continuous fiber reinforced shaft body 10 is placed in the hollow hole 18. Insert and engage the tapered surfaces 15 of the upper and lower continuous fiber reinforced shaft bodies 10 at the lower and upper cross-section arc-shaped widened portions 14 and 14a in the same manner as described above, The outer cylinder 17 embedded in the upper part of the first-stage concrete wall unit 8 is constrained, and the inner side is similarly constrained by the inner cylinder 16.
[0024]
Further, the uppermost concrete wall 8 is placed on the second-stage concrete wall 8, and the continuous fiber reinforced shaft 10 is inserted into the hollow hole 18, so that the second-stage concrete wall alone is placed. The outer cylinder 17 embedded in the upper part of 8 and the inner cylinder 16 on the inner side thereof are arranged so that the upper and lower continuous fiber reinforced shaft bodies 10 and the upper and lower cross-section arc-shaped widened parts 14 and 14a of the upper and lower continuous fiber reinforcing shafts 10 and 14a To be restrained.
[0025]
In addition, the outer cylinder 17 does not need to be provided in the lower part of the second-stage concrete wall unit 8. Further, in the uppermost concrete wall unit 8, a hollow hole 18 is provided therein, but no outer cylinder 17 is provided in either the upper part or the lower part of the hollow hole 18.
[0026]
On the other hand, the upper part of the uppermost concrete wall unit 8 is steel at the lower end of the steel shaft constituent member 7a made of H-shaped steel located at the upper part of the concrete wall 8a to be destroyed constructed according to the present invention. The steel bearing pressure plate 6a is welded, and the steel bearing pressure plate 6a is provided with a tensile force imparting means 27. By this tension imparting means 27, the upper part inserted into the hollow holes 18 of the individual concrete wall units 8 at the upper and lower stages. And the lower continuous fiber reinforced shaft body 10 are connected to each other so as to give a tensile force to the reinforcing material 11.
[0027]
The configuration of the tensile force applying means 27 is shown in FIGS. In each figure, a steel outer cylinder 30 having a circular hole 28 is fixed or placed at a position corresponding to the hollow hole 18 of the uppermost concrete wall 8, and the uppermost concrete is placed in the outer cylinder 30. A cross-sectional arc-shaped widened portion 14 that widens toward the upper end of the continuous fiber reinforced shaft 10 protruding from the hollow hole 18 of the single wall 8 is located.
[0028]
Further, between the cross-section arc-shaped widened portion 14 in the outer cylinder 30 is located a cross-section arc-shaped widened portion 33 that widens toward the lower side of the upper shaft body 32 having the split screw 31 on the outer surface, The tapered surfaces 15 of the upper and lower arc-shaped widened portions 14 and 33 are engaged with each other, and the outer diameter is restricted by the outer cylinder 30.
[0029]
Further, a spacer 34 having a split screw 31a on the outer periphery is disposed in the gap between the annularly arranged upper shaft bodies 32. The upper shaft body 32 and the spacers 34 form a ring shape, and a restraining member is provided on the inside thereof. The inner cylinder 16 is inserted. An annular screw 31b is formed by connecting the divided screw 31 of the upper shaft body 32 and the divided screw 31a of the spacer 34, and the inner screw 36 of the fastening ring 35 is screwed to the annular screw 31b.
[0030]
Therefore, in a state where the lower end surface of the fastening ring 35 is in contact with the upper end surface of the outer cylinder 30, the fastening ring 35 is rotated and fastened by engaging a tool (not shown) with the engagement hole 37. Then, the reaction force is taken in the order of the lower end surface of the fastening ring 35 → the outer cylinder 30 → the steel bearing plate 6a → the steel shaft forming member 7a, and the upper shaft body 32 is moved upward to reinforce the upper shaft body 32 and the continuous fiber. A tensile force can be applied to the continuous fiber reinforced shaft body 10 at the lower part of the shaft body 10 through the engagement of the tapered surfaces 15 of the arc-shaped widened portions 33 and 14 of the respective cross sections of the shaft body 10. As a result, the first and second stages and the individual concrete walls 8 at the uppermost stage are integrally coupled to each other, and the concrete wall 8a to be destroyed can be configured.
[0031]
Further, as shown in FIG. 9, metal fibers having a length of 15 cm or less extending in the arc direction are provided on the respective arcuate widened portions 14, 14 a at the upper and lower ends of the continuous fiber reinforced shaft body 10 made of fiber reinforced resin. It is reinforced by embedding 38 or a metal wire (not shown).
[0032]
Further, in the above configuration, if the diameter of the continuous fiber reinforced shaft body 10 of the annular arrangement, the outer cylinder 17 and the inner cylinder 16 is increased, the hollow hole 18 of the concrete wall single body 8 is utilized, and a tremy tube is passed through this, Mortar, concrete, or grout can be poured and solidified to form a solid concrete wall.
[0033]
Further, there is no precast concrete wall 8 alone, and the fiber reinforced shaft body 10, the outer cylinder 17 and the inner cylinder 16 can be extended vertically into the shaft (excavation groove) in the same manner as described above. Walls can also be constructed from cast-in-place concrete.
[0034]
Further, the length of the single precast concrete wall 8 does not need to coincide with the length of the fiber reinforced shaft body 10, and may be shorter than that. FIG. 10 shows an example of the second example of the present invention. It is shown. Of course, also in this case, the wall body is configured by laminating a plurality of concrete wall single bodies 8 having a length different from that of the fiber reinforced shaft body 10. 10 to 12, other connection configurations are the same as those in the first example.
[0035]
In FIG. 10, the outer cylinder 17 is provided over the entire length of the hollow hole 18 of the precast concrete wall 8 alone, but is not limited thereto, and is similar to the case of FIGS. , May be provided in a part of the lower part. However, when the outer cylinder 17 is disposed over the entire length of the hollow hole 18 as shown in FIG. 10 or in a range longer than the meshed portion of the arc-shaped widened portions 14 and 14a, the position of the joint within the hollow hole 18 Can be arbitrarily selected, or an allowable range is created at the position of the joint. Therefore, it is convenient for the continuous fiber reinforced shaft body 10 to be tensioned after the full length assembly to eliminate play and to prevent the concrete walls 8 from opening each other. Is good.
[0036]
  Further, any number of the reinforcing bars 11 formed by inserting the fiber reinforced shaft body 10 into the hollow hole 18 and connecting them vertically can be arranged on one concrete wall 8. For exampleFIG.Shows an example in which four pairs of reinforcing bars 11 are arranged on one concrete. Further, as shown in FIG. 14, the steel bearing plate 6 is formed into an annular shape, and as shown in FIG. 15, a single precast concrete wall layered thereon is also formed into a cylindrical shape. Convenient when applied to walls.
[0037]
FIG. 13 shows an example in which the steel bearing plate 6 to which the lower end of the fiber reinforced shaft body 10 is connected is provided on the steel pipe 40 constituting the shaft.
[0038]
17 to 23 show a third example of the present invention. In this example, the continuous fiber reinforced shaft body 10a made of carbon fiber has an intermediate portion 41 configured in a shaft shape having a predetermined diameter and a predetermined length, and the upper and lower ends thereof are respectively expanded at a predetermined inclination angle upward. A conical fixing portion 42 and a conical fixing portion 42a whose diameter is increased downward at a predetermined inclination angle.
[0039]
The fiber reinforced shaft body 10a is disposed so as to be connected in the vertical direction, and the end surfaces of the conical fixing portions 42 and 42a positioned at the upper and lower positions are brought into contact with each other, and this contact portion is, for example, an intermediate portion. The conical fixing portions 42 and 42a are constrained by being held by the two divided cylindrical constraining members 44 having the enlarged diameter tapered holes 43, and can be connected so as not to be separated in the vertical direction.
[0040]
An outer cylinder 45 as shown in FIGS. 19 to 21 is used as a means for restraining the expansion of the split split cylindrical restraint member 44, and the outer cylinder 45 is formed of the hollow hole 18 of the concrete wall unit 8. It is embedded in the upper and lower ends.
[0041]
Therefore, the joint portion of the fiber reinforced shaft body 10a connected vertically is integrated by holding the connecting portions of the upper and lower conical fixing portions 42, 42a with the divided cylindrical restraining member 44, and then the concrete wall. By inserting the fiber reinforced shaft body 10 a into the hollow portion 18 of the single body 8 and fitting the outer cylinder 45 embedded in the hollow portion 18 into the divided cylindrical restraining member 44, the diameter of the divided cylindrical restraining member 44 can be increased. The upper and lower fiber reinforced shafts 10a are integrated to form the reinforcing material 11a.
[0042]
When the hollow portion 18 of the concrete wall 8 is fitted to the fiber reinforced shaft body 10a, the tapered surface is formed so that the outer diameter or the lower side of the divided cylindrical restraining member 44 is gradually expanded as shown in FIGS. Corresponding to this, a tapered surface 47 is formed which gradually expands the inner diameter of the outer cylinder 45 downward as shown in FIG. 25, and a plurality of upper and lower rings 48 as shown in FIG. A tapered surface 47 in which the diameter of the inner surface from the upper one to the lower one is gradually increased may be formed.
[0043]
Note that the lowermost ends of the plurality of fiber-reinforced shafts 10a constituting the reinforcing material 11a have a conical fixing portion 49 that is fixed to the upper surface of the steel bearing plate 6 and whose diameter is expanded as shown in FIGS. The steel shaft body 50 is fixed by welding. That is, the steel bearing plate 6 is fixed to the upper edge of the steel shaft constituting member 7 so as to form the lower edge of the concrete wall 8a to be destroyed by the shield machine, and the steel shaft is attached to the upper surface thereof. The body 50 is fixed.
[0044]
The steel shaft body 50 is embedded in the precast first-stage concrete wall unit 8 formed on the upper surface of the steel bearing plate 6, and the conical fixing portion 49 protrudes from the upper surface of the concrete wall.
[0045]
The construction sequence in the third example of the present invention will be described. In the shaft, the concrete wall unit 8 is provisionally received at the erection port through the bar 52 in the horizontal through hole 51 of the first-stage concrete wall unit 8.
[0046]
Next, the conical fixing portion 42a at the lower end of the upper fiber-reinforced shaft 10a is butted against the lower conical fixing portion 49, and is held by the split cylindrical restraining member 44 from both sides and temporarily held by the elastic ring 53. . Next, the single-stage precast concrete wall 8 in the second stage is lowered, and the outer cylinder 45 is fitted outside the concrete wall (in addition, in the case of concrete on-site hitting, only the outer cylinder 45 is covered).
[0047]
Subsequently, the bar member 52 is detached from the horizontal through hole 51, the first-stage concrete wall unit 8 is suspended, and the second-stage concrete wall unit 8 is inserted into the horizontal through-hole (not shown). This is provisionally received through the bar 52, and the same steps as described above are repeated to suspend the fiber-reinforced shaft body 10a and the precast concrete wall unit 8 sequentially in the shaft, thereby forming the concrete wall 8a.
[0048]
Moreover, the upper part of the uppermost concrete wall unit 8 is provided with a steel bearing plate 6a at the lower end of a steel shaft constituent member 7a made of H-shaped steel located at the upper part of the destructible concrete wall section 12 constructed according to the present invention. Are welded, and a tensile force applying means 54 is provided on the steel bearing plate 6a. The tensile force applying means 54 applies a tensile force to the reinforcing material 11a formed by connecting the upper and lower fiber reinforced shafts 10a inserted in the hollow holes 18 of the individual concrete walls 8 on the upper and lower stages. It is made like that.
[0049]
The configuration of the tensile force applying means 54 is shown in FIG. In the figure, a tapered hole 56 concentrically with the circular hole 55 is formed on the upper surface of a steel bearing plate 6a having a circular hole 55 at a position corresponding to the hollow hole 18 of the uppermost concrete wall 8 alone. The fastening cylinder 57 having the inner screw 59 screwed with the outer peripheral screw 58 of the fastening block 57 is positioned on the upper surface of the steel bearing plate 6a.
[0050]
Therefore, in a state where the lower end surface of the fastening cylinder 60 is in contact with the upper end surface of the steel bearing pressure plate 6a, the fastening cylinder 60 is turned and fastened, thereby taking a reaction force on the steel bearing pressure plate 6a. The fastening block 57 is pulled up, and the diameter-enlarged cone fixing portion 42 is pulled up integrally with the fastening block 57, so that tension can be applied to the fiber reinforced shaft body 10a connected up and down via the joint portion. The concrete wall unit 8 for destruction can be configured by integrally connecting the concrete wall units 8 stacked one above the other.
[0051]
  In addition, after emphasizing the full length of the concrete wall 8a, if it is important to tension the fiber reinforced shaft 10 or 10a to eliminate play and thereby prevent the concrete walls 8 from opening, the precast concrete wall Single 8Outer cylinder 17 or outer cylinder 45Without integratingOuter cylinder 17 or outer cylinder 45It is preferable to set it as the process of installing a precast concrete wall body from the top after attaching to the joint part of the fiber reinforced shaft 10 or 10a.
[0052]
Further, in the case of the construction with the precast concrete wall 8, the fiber reinforced shaft body 10 a passing through the hollow hole 18 receives the load of the concrete wall 8 on the laying side and the steel shaft structural member 7 to receive the hollow hole 18, but the tapered surfaces of the conical fixing portions 42 and 42 a of the fiber reinforced shaft 10 a push open the split cylindrical restraint member 44, and the outer surface thereof is pressed against the inner surface of the outer cylinder 45. If the cylinder 45 communicates with the hollow hole 18 and is embedded in the concrete wall unit 8, the fiber reinforced shaft body 10 a does not fall. After the concrete wall 8a is assembled and integrated over the entire length in this way, when the upper steel member 7a is fixed on the construction base surface, the rope 25 temporarily held halfway becomes unnecessary, so the auxiliary wire 25a is pulled and the claws of the hanging bracket 26 are pulled. And the rope 25 can be removed.
[0053]
With the above-described fixing structure, the fiber reinforced shaft body 10a can be integrated with the concrete wall unit 8 and the cross-section plane can be maintained. In this case as well, after the fiber reinforced shaft body 10a is tensioned, mortar, concrete or It is also possible to inject a grout or the like to solidify and secure adhesion of the internal fiber-reinforced shaft body 10a.
[0054]
In the present invention, as described above, when the concrete wall unit 8 and the outer cylinder 17 and the outer cylinder 45 are integrated in advance when the concrete is placed, the joints of the fiber-reinforced shaft bodies 10 and 10a are joined. In addition to being efficient, the fiber-reinforced shafts 10 and 10a including the joints are attached to the concrete and the cross-section of the member is kept flat, so that compared to the case of unbonded post tension. This is advantageous in terms of cross-sectional design. In particular, in order to increase the adhesion between the concrete and the fiber reinforced shafts 10, 10a or the outer cylinder, it is also effective to form a concavo-convex shape on the surface of the fiber reinforced shafts 10, 10a or the outer cylinder in contact with the concrete. is there.
[0055]
Further, both ends of the divided cylindrical restraining member 44 are thickened as the inner diameter is reduced. In general, when molding and hardening thick FRP, cracks due to temperature distribution are likely to occur during temperature rise and slow cooling, but by using a metal wire or fiber within the range of conditions that do not affect the machinability, The divided cylindrical restraining member 44 having a desired shape can be formed without increasing the thermal conductivity of the material to prevent the occurrence of a temperature difference and without generating cracks. In addition, the mouth of the end portion of the joint formed by combining the divided cylindrical restraining members 44 is originally a place where stress is likely to concentrate, and has a toughness like metal in a condition range that does not affect the machinability. Arranging the material is also effective from the viewpoint of improving joint strength.
[0056]
Further, the conical surface of the intermediate-diameter enlarged taper hole 43 formed on the inner surface of the fiber-reinforced resin split cylindrical restraint member 44 has a shape that is tapered toward both ends in the axial direction of the split cylindrical restraint member 44. It is. On the other hand, in the case of such an FRP that is axisymmetric and requires strength, it is essential to manufacture the reinforcing fiber while controlling the orientation of the reinforcing fiber with high precision, and in order to satisfy this, it is exclusively attached to the shaft. It is preferable to use a method called filament winding in which fibers are wound around a mold while it is rotated. In this case, the rotary body molded around the mold cannot be pulled out because the both ends of the hollow portion are recessed. Therefore, for example, the simplest method is to make a disposable mold using an inexpensive material such as wood, and cut the entire molded body vertically to obtain a split cylinder.
[0057]
【The invention's effect】
As described above, according to the present invention, a continuous fiber reinforced shaft body of a limited length is limited in a limited space in the interior of a shaft such as a shaft, while the tensile strength is not lost in the joint portion, and the muscle is continuously added. The material can be easily configured, and it is not necessary to use any flowable material or FRP bolts. The connection work does not require skill, and the construction is highly reliable. Moreover, a concrete wall body to be destroyed can be constructed by this reinforcing material, and in the concrete wall body constructed in this way, a continuous fiber reinforced shaft body and a joint portion thereof can be cut with a continuous fiber as a centerable material. Therefore, it can be easily cut with a cutter bit of a shield machine.
[0058]
Furthermore, at the both ends of the concrete wall constructed in this way, where it is outside the reach of the shield machine, it becomes a steel shaft structure or reinforced concrete structure, but the connection between these and the concrete wall of the present invention is The steel shaft body fixed to the former and the fiber reinforced shaft body fixed to the latter are connected smoothly.
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing an example in which the present invention is applied to a concrete wall of a shield machine propulsion unit in a vertical shaft.
FIG. 2 is an exploded perspective view showing an assembled state of the fiber-reinforced shaft body according to the first example of the present invention.
3 is a perspective explanatory view showing a state at the time of assembly of FIG. 2; FIG.
4 is an exploded perspective view of an upper tensile force applying unit in FIG. 3;
FIG. 5 is a vertical sectional view of the lower part of FIG. 3;
6 is a vertical sectional view of the upper part of FIG. 3. FIG.
7 is a cross-sectional view taken along the line AA in FIG.
FIG. 8 is a development explanatory view of a joint portion of a fiber-reinforced shaft body.
FIG. 9 is a perspective view showing a reinforcing structure of a cross-section arc-shaped widened portion at the bottom of the fiber-reinforced shaft body.
FIG. 10 is a perspective view showing a relationship between a fiber-reinforced shaft body and a concrete wall body according to a second example of the present invention.
11 is a perspective view showing an engagement state between the arc-shaped widened portions in the cross-section of the upper and lower fiber-reinforced shaft bodies in FIG.
12 is a partially cross-sectional plan view showing the relationship between the cross-sectional arc-shaped widened portion, the inner cylinder, and the outer cylinder in FIG. 10;
FIG. 13 is a perspective view of an example of a steel shaft body that connects lower ends of fiber reinforced shaft bodies.
FIG. 14 is a perspective view of a modification of FIG.
FIG. 15 is a perspective view of an upper fiber reinforced shaft corresponding to FIG. 14;
FIG. 16 is a plan view crossing the joint portion as an example in which four fiber reinforced shafts are disposed on a single concrete wall.
FIG. 17 is an exploded perspective view showing an assembled state of the fiber-reinforced shaft body according to the second example of the present invention.
18 is a vertical sectional view of the lower part of FIG.
FIG. 19 is a longitudinal sectional view of a connected state of an arcuate widened portion in the upper cross section in FIG.
FIG. 20 is a longitudinal sectional view showing a state in which a single upper precast concrete wall is stacked in FIG. 19;
FIG. 21 is a longitudinal sectional view of the connected state of the arcuate widened portion in the upper cross section in FIG.
FIG. 22 is a longitudinal sectional view of FIG. 21 with a tensile force applying means attached to the upper end.
FIG. 23 is a longitudinal sectional view of a joint portion of the fiber-reinforced shaft body.
24 is a cross-sectional view taken along the line BB in FIG.
FIG. 25 is a longitudinal sectional view of a joint portion of the fiber-reinforced shaft body.
26 is a cross-sectional view taken along the line CC in FIG. 25. FIG.
FIG. 27 is a longitudinal sectional view of a joint portion of the fiber-reinforced shaft body.
28 is a cross-sectional view taken along the line DD of FIG.
FIG. 29 is a side view illustrating a shield machine in a vertical shaft and a concrete wall in a propulsion unit as a conventional example.
[Explanation of symbols]
  1 shaft
  2 shield machine
  3 Reinforced concrete wall
  4 propulsion parts
  6 Steel bearing plate
  7 Steel shaft components
  8 Concrete wall alone
  8a concrete wall
  10, 10a Continuous fiber reinforced shaft
  11, 11a Muscle material
  12 areas
  13 Middle part
  14, 14a Wide cross-section arc-shaped widened portion
  15 Tapered surface
  16 Inner cylinder (annular restraint member)
  17 Outer cylinder (restraint member)
  18 Hollow hole
  20 Fixed part
  21 round hole
  22 Cross-section arc-shaped widened part
  23 Steel shaft
  24 Hanging bracket
  25 Hanging rope
  25a Auxiliary wire
  26 Hanging bracket
  27 Tensile force imparting means
  28 hole
  30 outer cylinder
  31 Split screw
  32 Upper shaft
  33 Cross-section arc-shaped widened part
  34 Spacer
  35 Fastening ring
  36 Internal thread
  37 engagement hole
  38 Metal fiber
  40 steel pipes
  41 Middle part
  42, 42a Conical fixing part
  43 Middle diameter enlarged taper hole
  44 Divided cylindrical restraint member
45 Outer cylinder (ring member)
  46 Tapered surface
  47 Tapered surface
  48 ring
  49 Conical anchorage
  50 Steel shaft
  51 Horizontal through hole
  52 Bar
  53 Elastic Ring
  54 Tensile force imparting means
  55 hole
  56 Tapered hole
  57 Fastening block
  58 External thread

Claims (17)

  A continuous fiber reinforced shaft made of a fiber reinforced resin having an upper bulging connecting portion having a taper portion expanding upward and a lower bulging connecting portion having a taper portion expanding downward at the upper and lower portions. A reinforcing material for a concrete wall characterized in that the body is connected up and down and the connecting part is restrained so as not to be detached using a restraining member. The taper surface of the cross-sectional arc-shaped widened portion as the upper bulge connecting portion widened upward, and the taper surface of the cross-sectional arc-shaped widened portion as the lower bulged connecting portion widened downward The plate-like continuous fiber reinforced shafts made of fiber reinforced resin at the upper and lower portions are connected vertically and arranged annularly at a predetermined interval, and the upper and lower cross-sectional arc-shaped widened portions The reinforcing material for a concrete wall according to claim 1, wherein the tapered surfaces are engaged with each other, and the engaging portion is restrained so as not to be detached by using an annular restraining member.   The reinforcing material for a concrete wall according to claim 2, wherein a metal fiber or a metal wire having a length of 15 cm or less extending in the arc direction is embedded in the cross-section arc-shaped widened portion. A conical fixing portion as the upper bulging connection portion having a tapered outer surface that expands in the upward direction, and a conical fixing portion as the lower bulging connection portion having a tapered outer surface that expands in the downward direction, respectively. The rod-like continuous fiber reinforced shafts made of fiber reinforced resin at the upper and lower portions are connected vertically with the end faces of the conical fixing portions in contact with each other, and the upper and lower conical fixing portions are The reinforcing material for a concrete wall according to claim 1, wherein the reinforcing member is surrounded by a divided cylindrical constraining member having an intermediate-diameter enlarged taper hole and integrally held.   The reinforcing material for a concrete wall according to claim 4, wherein the divided cylindrical constraining member is constrained by an annular member fitted therein.   The reinforcing material for a concrete wall according to claim 4, wherein a metal fiber or a metal wire having a length of 15 cm or less extending in the circumferential direction is embedded in the divided cylindrical restraining member.   A concrete wall comprising a plurality of reinforcing bars comprising the continuous fiber reinforced shaft according to any one of claims 1, 2, and 4 and embedded in concrete.   The concrete wall according to claim 7, wherein the plurality of reinforcing bars are further tensioned and embedded in concrete.   A continuous fiber reinforced shaft made of a fiber reinforced resin having an upper bulging connecting portion having a taper portion expanding upward and a lower bulging connecting portion having a taper portion expanding downward at the upper and lower portions. A joint structure of a continuous fiber reinforced shaft body, characterized in that the body is connected vertically and the connecting part is restrained by a restraining member so as not to be detached. The taper surface of the cross-section arc-shaped widened portion as the lower bulge connecting portion , which is provided at the lower portion of the plate-like continuous fiber reinforced shaft body made of fiber reinforced resin located at the upper portion and widens downward, and the lower portion The taper surface of the cross-section arc-shaped widened portion as the upper bulging connecting portion that widens upward is provided at the upper portion of the plate-like continuous fiber reinforced shaft body made of fiber reinforced resin positioned at The joint structure of the continuous fiber reinforced shaft body according to claim 9, wherein the engaging portion is restrained by an annular restraining member so as not to be detached. A conical fixing portion as the lower bulging connecting portion having a tapered outer surface that expands downwardly and is provided at the lower portion of a rod-like continuous fiber reinforced shaft body made of a fiber reinforced resin positioned at the upper position, and positioned at a lower position The end surfaces of the conical fixing portion as the upper bulging connecting portion having a tapered outer surface whose diameter is expanded upward provided at the upper portion of a rod-like continuous fiber reinforced shaft body made of a fiber reinforced resin is in contact with each other. The upper and lower conical fixing portions are surrounded by a divided cylindrical restraining member having an intermediate-diameter enlarged taper hole and integrally held by the upper and lower conical fixing portions. The joint structure of the described continuous fiber reinforced shaft body.   A continuous fiber reinforced shaft made of a fiber reinforced resin having an upper bulging connecting portion having a taper portion expanding upward and a lower bulging connecting portion having a taper portion expanding downward at the upper and lower portions. A method for connecting continuous fiber reinforced shafts, characterized by connecting the bodies up and down and restraining the joints so as not to be detached using a restraining member, thereby forming a reinforcing material for a concrete wall to be cut. The taper surface of the cross-section arc-shaped widened portion as the lower bulging connecting portion, which widens downward, provided at the lower portion of a plate-like continuous fiber reinforced shaft body made of fiber reinforced resin located at the upper position, The upper surface of the plate-like continuous fiber reinforced shaft made of fiber reinforced resin is engaged with the taper surface of the cross-section arc-shaped widened portion as the upper bulging connecting portion that widens upward. The connecting method of a continuous fiber reinforced shaft body according to claim 12, wherein the engaging portion is restrained so as not to be detached by using an annular restraining member to form a reinforcing material for a concrete wall to be cut.   14. The continuous fiber reinforced shaft connecting method according to claim 13, wherein a metal fiber or a metal wire having a length of 15 cm or less extending in the arc direction is embedded in the cross-section arc-shaped widened portion. A conical fixing portion serving as a lower bulging connecting portion having a tapered outer surface that expands downwardly and is provided at a lower portion of a rod-like continuous fiber reinforced shaft body made of a fiber reinforced resin located at an upper position, and positioned at a lower position. The respective end surfaces of the conical fixing portion serving as the upper bulging connecting portion having a tapered outer surface having a diameter increasing upward provided at the upper portion of a rod-like continuous fiber reinforced shaft body made of fiber reinforced resin are brought into contact with each other. The upper and lower conical fixing portions are connected vertically and surrounded by a divided cylindrical constraining member having an intermediate-diameter enlarged taper hole, and are integrally held to form a reinforcing material for a concrete wall to be cut. The connection method of the continuous fiber reinforcement shaft body of Claim 12 characterized by these.   The method for connecting continuous fiber reinforced shafts according to claim 15, wherein the split cylindrical restraint member is restrained by an annular member fitted thereto.   16. The method for connecting continuous fiber reinforced shafts according to claim 15, wherein metal fibers or metal wires having a length of 15 cm or less extending in the circumferential direction are embedded in the divided cylindrical restraining members.

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