Positioning and fixing device for embedded members

Abstract

To provide a positioning fixing device for a push-in member capable of performing the correct positioning and secure fixing of a push-in member.SOLUTION: In a positioning fixing device 21 for a push-in member 7 with respect to a flask 15 used for installing the push-in member 7 comprising: a push-in part 9 having a flange part 10 at a base part; and an exposure part 11 having an engaging protrusion part 13 at the front end part and the rear end part in a depth direction Y in the flask 15, the device comprises: a shaft part 25 provided at a position not interfered with the push-in member 7 in the lower part of an opening part in the flask 15 and elongating horizontally in the depth direction; and positioning fixing means 23 formed by a spring material to be abutted against a part of the exposure part 11 of the push-in member 7 and exert a pushing-in force F to the inner part in a width direction X of the push-in member 7 and a holding force S to the lower part in an installation direction Z of the push-in member 7 by utilizing the shaft part 25.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a positioning and fixing device for an embedded member with respect to a formwork, which is used when manufacturing a concrete structure such as a concrete sleeper in which an embedded member is embedded.

Background Art

[0002] Some concrete structures are manufactured by embedding an embedded member made of a material different from concrete so that a part of it is exposed on the surface. For example, in a concrete sleeper used for laying rails, a cast iron embedded member (shoulder) for attaching a rail fastening device is positioned and fixed at a predetermined position in a formwork. Then, concrete is placed in the formwork, cured, and hardened to manufacture a concrete sleeper in which the embedded member (shoulder) is embedded at a predetermined position.

[0003] For positioning and fixing an embedded member with respect to a formwork, a positioning and fixing device for the embedded member is used. Hereinafter, the positioning and fixing device for the embedded member may be simply referred to as a positioning and fixing device. FIG. 12 is a side sectional view showing a conventional positioning and fixing device. As shown in FIG. 12, the conventional positioning and fixing device uses a double screw mechanism 107 having a screw portion 103 of a left screw and a screw portion 105 of a right screw to move two opposing claws 109 closer and farther apart. Also, a positioning and fixing device has been proposed in which two pressing rollers located opposite to each other are pressed inward using the biasing force of a coil spring (see Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the screw-type positioning and fixing device 101 shown in FIG. 12, there is a problem that rust occurs on the screw portions 103 and 105, resulting in poor movement. In addition, since the tip of the claw 109 is prone to wear, it is necessary to frequently replace it with a new claw 109 according to the degree of wear. On the other hand, in the coil spring-type positioning and fixing device shown in Patent Document 1, there is a problem that the load resistance becomes large and the workability is poor when setting the embedding member in the formwork and when demolding the formed concrete tie from the formwork. Further, since the balance and magnitude of the pressing forces of the left and right pressing rollers are related to a plurality of factors such as the difference in the biasing force strength of the coil spring, a subtle difference inevitably occurs in the structure, and it also causes a problem that fine adjustment takes time.

[0006] Furthermore, in the case of a concrete tie, it is necessary to hold the shoulder, which is the embedding member, in a state where it is pushed toward the center in the width direction of the rail, which is the mounting member. However, in the case of the conventional two types of positioning and fixing devices, since the structure is such that the claw 109 or the pressing roller, which is the pressing means, is only pressed against the end face in the longitudinal direction of the rail of the shoulder, it is difficult to sufficiently obtain the pushing force toward the center in the width direction of the rail and the pressing force downward in the installation direction of the rail.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide a positioning and fixing device for an embedding member that can accurately position and reliably fix the embedding member.

Means for Solving the Problems

[0008] The positioning and fixing device for an embedding member in the present invention for solving the above object is a positioning and fixing device for an embedding member with respect to a formwork used when a pair of embedding members each having an embedding portion with a flange portion at the base and an exposed portion with engaging convex portions at both ends in the depth direction are installed in a facing manner with a predetermined interval in the width direction using two openings provided at a predetermined interval in the width direction. It is provided at a position that does not interfere with the embedding member below the opening of the formwork, and has a shaft portion that extends horizontally in the depth direction. Positioning and fixing means formed by a spring material that abuts against a part of the exposed portion of the embedded member using the shaft portion and applies a pushing force inward in the width direction of the embedded member and a pressing force downward in the installation direction of the embedded member. and A part of the exposed portion of the embedding member with which the positioning and fixing means abuts is a guiding action surface that slopes downward outward in the width direction on the upper surfaces of the engaging convex portions provided at both ends in the depth direction of the exposed portion, The positioning and fixing means is a torsion coil spring, The torsion coil spring, A coil portion externally fitted to the shaft portion, A base end locking portion provided at one end of the coil portion and fixed to the shaft portion, A contact action portion provided at the tip of the arm portion extending from the other end of the coil portion and contacting the guiding action surface, and has It is characterized by this.

[0009] Here, when a concrete sleeper is applied as the concrete structure formed by embedding the embedded member, the width direction refers to the direction that coincides with the width direction of the laid rail, and the depth direction refers to the direction that coincides with the extension direction of the laid rail.

[0010] The positioning and fixing device for the embedded member of the present invention includes the positioning and fixing means formed by a spring material that abuts against a part of the exposed portion of the embedded member and applies a pushing force inward in the width direction of the embedded member and a pressing force downward in the installation direction of the embedded member. For this reason, when a concrete sleeper is applied as the concrete structure formed by embedding the embedded member, the lack of the pushing force toward the center in the rail width direction and the pressing force downward in the rail installation direction, which have been problems in the past, are eliminated.

[0012] Here, the number of turns of the coil portion may be 1, may be 2, or may be 3 or more (for example, 5). Also, the number of turns of the coil portion may be determined according to the required pressing force (fastening force) in the contact acting portion that acts on the guide acting surface.

[0013] If a positioning and fixing device for an embedded member in such a manner is adopted, by pressing the contact acting portion of the positioning and fixing means against the guiding acting surface inclined downward outward in the width direction at a predetermined angle, the required pushing force and pressing force in two directions can be obtained. Further, by adopting the torsion coil spring including the coil portion, the base end locking portion, and the contact acting portion for the positioning and fixing means, the problems of rust generation in the screw portion and wear at the claw tip, which were problems in the conventional screw-type positioning and fixing device for an embedded member, can be avoided.

[0014] Further, in the positioning and fixing device for an embedded member of the present invention, the positioning and fixing means is provided in a pair so as to face each other on both sides in the depth direction with the exposed portion of the embedded member interposed therebetween. Each of the pair of positioning and fixing means is provided in a state of being externally fitted to an intermediate portion of the shaft portion, and a pipe collar that is somewhat longer than the length in the depth direction of the exposed portion of the embedded member, and a pair of retaining rings provided in a state of being externally fitted to the shaft portion at positions close to the outer sides of both end faces of the pipe collar and sandwiching the positioning and fixing means from the outside may be provided.

[0015] If a positioning and fixing device for an embedded member in such a manner is adopted, it becomes possible to transmit force evenly to the left and right with respect to the exposed portion of the embedded member, and the alignment of the positioning and fixing means arranged on both sides (front and rear) in the depth direction can be smoothly performed.

[0016] Further, in the positioning and fixing device for an embedded member of the present invention, it is preferable that the positioning and fixing means is formed using a linear material having a wire diameter of 3 mm to 5 mm.

[0017] If a positioning and fixing device for the embedded member in such a manner is adopted, by changing the wire diameter in addition to the number of turns and the coil diameter of the coil portion, it becomes possible to more finely adjust the pressing force (fastening force) of the contact acting portion acting on the guiding working surface of the engaging convex portion. As a result, a positioning and fixing means that is compact, inexpensive, and easy to adjust the pressing force (fastening force) can be provided.

[0018] Further, in the positioning and fixing device for the embedded member of the present invention, an end nut provided at at least one end portion of the shaft portion and having a lock pin attached so as to protrude in the radial direction for setting the mounting angle of the shaft portion, and a lock plate provided on the outer surface of the support side plate provided on the lower surface of the formwork so as to be rotatable up and down and having a fitting hole into which the lock pin is fitted may be provided.

[0019] If a positioning and fixing device for the embedded member in such a manner is adopted, when in use, by rotating the lock plate downward to fit the lock pin attached to the end nut into the fitting hole, it becomes possible to keep the mounting angle of the shaft portion and the pressing force (fastening force) of the contact acting portion with respect to the guiding working surface of the engaging convex portion constant. On the other hand, when attaching and detaching the embedded member to and from the formwork, only by rotating the lock plate upward to release the fitting between the lock pin and the fitting hole, a large load resistance is not applied. As a result, the workability of the setting work of the embedded member, the demolding work of the concrete structure, and the component replacement work can be improved.

[0020] Further, by using a recess provided in the middle portion in the depth direction of the exposed portion of the embedded member, two support plates with a stop shaft attached horizontally are provided vertically downward from the lower surface of the formwork, and both end portions in the depth direction of the stop shaft abut against the lower surface of the engaging convex portion, so that together with the flange portion provided in the embedded portion, it is also possible to configure to restrict the downward movement of the embedded member with respect to the formwork in the installation direction.

[0021] By doing so, the lower surface of the flange portion and the upper surface of the peripheral edge of the opening act as the first installation direction positioning means for restricting the downward movement of the embedding member, and the lower surface of the engaging convex portion and the downward stop shaft act as the second installation direction positioning means for restricting the downward movement of the embedding member. And by these two installation direction positioning means, the positioning of the embedding member in the installation direction can be accurately executed.

[0022] Also, it is also possible to form a pocket portion recessed in accordance with the outer shape of the exposed portion of the embedding member set in the formwork with respect to the support plate.

[0023] By doing so, the base portion on the inner side in the width direction of the exposed portion and the inner peripheral surface of the opening in contact therewith act as the first width direction positioning means for restricting the inward movement of the embedding member in the width direction, and the outer surface of the exposed portion of the embedding member and the inner surface of the pocket portion in contact therewith act as the second width direction positioning means for restricting the inward and outward movement of the embedding member in the width direction. Also, by these two width direction positioning means, the positioning of the embedding member in the width direction can be accurately executed.

Advantages of the Invention

[0024] According to the positioning and fixing device for the embedding member of the present invention, the pushing force toward the center in the width direction and the pressing force downward in the installation direction, which were insufficient in the past, are enhanced, and accurate positioning and reliable fixing in the width direction and the installation direction of the embedding member can be executed.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0026] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the following description, first, the usage state and basic configuration of a concrete sleeper, which is an example of a concrete structure, will be briefly described.

[0027] FIG. 1 is a longitudinal front view showing the usage state of the concrete sleeper 1, and FIG. 2 is a plan view showing the concrete sleeper 1 in which the embedded member is embedded. The concrete sleeper 1 is a supporting member for the rail 3, and is excellent in durability compared with a conventional wooden sleeper, excellent in stability due to its heavy weight, and also excellent in maintainability.

[0028] As shown in Fig. 1, on the upper surface of the concrete sleeper 1, a rail fastening device 5 for fastening the installed rail 3 to the concrete sleeper 1 is provided. And in the concrete sleeper 1, an embedding member (shoulder) 7 necessary for installing the rail fastening device 5 is embedded with a part thereof exposed on the upper surface.

[0029] As shown in Figs. 1 and 2, the embedding member 7 is composed of an embedding part 9 embedded in the concrete sleeper 1 and an exposed part 11 exposed on the upper surface of the concrete sleeper 1. At the base of the embedding part 9 that forms the boundary with the exposed part 11, a flange part 10 protruding outward in a roof shape is formed. On the other hand, on the exposed part 11, parts necessary for fastening, such as an engaging convex part 13 used for installing the above-mentioned rail fastening device 5, are provided. What is used in the manufacture of the concrete sleeper 1 in which the embedding member 7 is embedded is the embedding member 7, the formwork 15 described below, and the positioning and fixing device 21 for the embedding member of the present invention. Hereinafter, the positioning and fixing device 21 for the embedding member may be simply referred to as the positioning and fixing device 21. Also, in this application document, the width direction (the left-right direction in Figs. 1 and 2) of the laid rail (mounting member) 3 is referred to as the width direction X, and the extending direction (the up-down direction in Fig. 2) of the rail (mounting member) 3 is referred to as the depth direction Y. Furthermore, more specifically described later, the installation direction (the up-down direction in Fig. 1) of the embedding member 7 is referred to as the installation direction Z.

[0030] Fig. 3 is a side sectional view showing a state where the embedding member 7 is set in the formwork 15, and Fig. 4 is a longitudinal front view showing a state where the embedding member 7 is set in the formwork 15. In Fig. 3, the left-right direction is the depth direction Y, and in Fig. 4, the left-right direction is the width direction X.

[0031] As shown in Fig. 4, a pair of positioning and fixing devices 21 of the present embodiment are installed so as to face each other by using two openings 17, 17 of a formwork 15 provided with an embedding member 7 at a predetermined interval in the width direction X. As shown in Figs. 3 and 4, the embedding member 7 includes an embedding portion 9 having a flange portion 10 at the base, and an exposed portion 11 having engaging convex portions 13 at both ends in the depth direction Y (front end portion and rear end portion), respectively. And in this embodiment, the positioning and fixing device 21 is used to position and fix a pair of embedding members 7 in two sets in a state where they face each other by using four openings 17 in total in two sets formed in the formwork 15 for forming the concrete sleeper 1.

[0032] The formwork 15 is, for example, a long trough-shaped member of a size capable of forming a concrete sleeper 1 having a dimension in the depth direction Y of about 240 mm, a dimension in the width direction X of about 2000 mm, and a height of about 174 mm. On the bottom plate, two pairs of four square-hole-shaped openings 17, 17 for installing two opposing embedding members 7, 7 are formed at positions separated by the gauge width of the rail 3. Further, a shaft portion 25 extending in the depth direction Y is provided at a position where it does not interfere with the embedding member 7 below the opening 17 of the formwork 15. Specifically, the shaft portion 25 is provided horizontally via two support side plates 27, 27 provided vertically downward from the lower surface of the formwork 15.

[0033] Fig. 5 is an explanatory view showing the acting direction and positioning portion of the force of the positioning and fixing means 23 with respect to the guiding working surface 49 of the engaging convex portion 13.

[0034] As shown in Fig. 5, a positioning and fixing means 23 is provided which uses the shaft portion 25 to abut against a part of the exposed portion 11 of the embedding member 7 and applies a pushing force F inward in the width direction X (left direction in Fig. 5) of the embedding member 7 and a pressing force S downward in the installation direction Z of the embedding member 7. The positioning and fixing means 23 is formed of a spring material. The positioning and fixing device 21 is basically configured by including the shaft portion 25 and the positioning and fixing means 23.

[0035] As shown in Fig. 3, in the positioning and fixing device 21 according to the present embodiment, a pair of positioning and fixing means 23 are provided on both sides (front and rear) in the depth direction Y sandwiching the exposed portion 11 of the embedding member 7 so as to face each other. Further, in the present embodiment, in addition to these configurations, a pipe collar 29 provided between the opposing positioning and fixing means 23, 23, two retaining rings 31, 31 provided outside the positioning and fixing means 23 sandwiching it, and a lock mechanism 32 for setting and fixing the mounting angle θ (see Fig. 5) of the shaft portion 25 are provided, whereby the positioning and fixing device 21 of the embedding member is configured.

[0036] The positioning and fixing means 23 is constituted by a torsion coil spring 24 including a coil portion 41 having a predetermined coil diameter D (see Fig. 8) externally fitted to the shaft portion 25 outside both ends of the pipe collar 29, a base end locking portion 43 formed by bending one end of the coil portion 41 outward, and a contact acting portion 47 formed by bending the tip of an arm portion 45 extending from the other end of the coil portion 41 inward. For the torsion coil spring 24, a linear material with a wire diameter d of 3 mm to 5 mm can be used.

[0037] Figs. 8 and 9 are a front view (a), a side view (b), and a bottom view (c) showing an example of the positioning and fixing means 23.

[0038] As the positioning and fixing means 23 of the present invention, a torsion coil spring 24A with the number of turns N of the coil portion 41 being 1 shown in Fig. 8 and a torsion coil spring 24B with the number of turns N of the coil portion 41 being 2 shown in Fig. 9 using a linear material with a wire diameter d of 4.5 mm can be exemplified.

[0039] Also, the coil diameter D of the coil portions 41 of the two types of torsion coil springs 24A and 24B is set such that the inner diameter thereof is larger than the diameter of the shaft portion 25 (see FIGS. 4 and 5). Specifically, in the present embodiment, a round bar with a diameter of 25 mm is used as the shaft portion 25, and the coil diameter D of the coil portion 41 is set to 30 mm so as to be 0.5 mm larger, i.e., 25.5 mm. Note that the lengths of the proximal end locking portion 43 and the abutting action portion 47 are set to 10 mm. Note that the number of turns N of the coil portion 41 is not limited to one or two turns, and it is also possible to adopt a torsion coil spring 24 having a coil portion 41 with three or more turns (for example, five turns). Further, in addition to the number of turns N of the coil portion, by changing the coil diameter D and the wire diameter d, it is possible to finely adjust the pressing force (fastening force) of the abutting action portion 47, which will be described in detail later.

[0040] In the present embodiment, the pipe collar 29 shown in FIG. 3 is formed of a pipe material having a circular cross section, and the inner diameter of the pipe collar 29 is set to 25.5 mm, which is slightly larger than the diameter of 25 mm of the shaft portion 25, similar to the inner diameter of the coil portions 41 of the torsion coil springs 24A and 24B. Also, the length of the pipe collar 29 is set to be slightly longer than the length in the depth direction Y of the exposed portion 11 of the embedding member 7.

[0041] FIG. 10 is a longitudinal front view (a) showing the retaining ring 31 and a cross-sectional view (b) taken along line b-b in the longitudinal front view (a).

[0042] As shown in FIG. 10, as the retaining ring 31, an annular member having a rectangular cross section can be used. Specifically, two retaining rings 31 with an inner diameter of 25.5 mm, which is slightly larger than the diameter of the shaft portion 25, an outer diameter of 42 mm, and a length in the depth direction Y (the vertical direction in FIG. 10(b)) of 10 mm are used. Also, the retaining ring 31 is provided with mounting holes 53 for mounting to the shaft portion 25 using mounting bolts 51 so as to penetrate from the outer peripheral surface to the inner peripheral surface of the retaining ring 31. Note that the shaft portion 25 at the position where the retaining ring 31 is mounted is provided with screw holes 55 that are screwed with the male screw portions of the mounting bolts 51.

[0043] Furthermore, the retaining ring 31 is formed with a groove portion 57 having a depth capable of accommodating the proximal end locking portions 43 of the torsion coil springs 24A and 24B from the inner peripheral surface toward the outer peripheral surface. Thus, when the torsion coil springs 24A and 24B are attached to the shaft portion 25, the proximal end locking portions 43 of the torsion coil springs 24A and 24B are accommodated in the groove portion 57 of the retaining ring 31 and sandwiched between the retaining ring 31 and the shaft portion 25, and are attached in a state of being fixed to the shaft portion 25 together with the retaining ring 31 (see also FIG. 3). Note that the position of the screw hole 55 formed in the shaft portion 25 in the depth direction Y is set such that there is a slight gap between both end surfaces of the pipe collar 29 sandwiched between the two torsion coil springs 24A and 24B when the torsion coil springs 24A and 24B are attached to the shaft portion 25.

[0044] Also, in the case of the two torsion coil springs 24B shown in FIG. 9, due to the relationship of the number of turns N, it is necessary to form two screw holes 55 at positions of the shaft portion 25 that are displaced outward by the wire diameter d compared to the single torsion coil spring 24A shown in FIG. 8. If it is not desired to change the position of the screw holes 55, the screw holes 55 may be set at positions for attaching the two torsion coil springs 24B, and when attaching the single torsion coil spring 24A, it is possible to use a separately provided retaining ring 31 that is lengthened by the wire diameter d of the torsion coil spring 24A in the depth direction Y. Further, a spacer or the like having the same thickness as the wire diameter d of the torsion coil spring 24A may be interposed between the retaining ring 31 and the torsion coil spring 24A to attach the torsion coil spring 24A.

[0045] As shown in FIG. 3, at least one end portion of the shaft portion 25 is provided with an end nut 35 fixed thereto. A lock pin 33 for setting the attachment angle θ (see FIG. 5) of the shaft portion 25 is attached to the end nut 35 so as to protrude in the radial direction. On the other hand, on the outer surface of the support side plate 27, a lock plate 39 having a fitting hole 37 into which the lock pin 33 is fitted is provided in a state of being rotatable up and down via a bearing 40. The rotatable lock plate 39 and the lock pin 33 constitute a locking mechanism 32.

[0046] The mounting angle θ of the shaft portion 25 is the angle of the shaft portion 25 when the contact acting portion 47 of the torsion coil spring 24 is pressed against the guide acting surface 49 with a predetermined pressing force, with the position retracted from the guide acting surface 49 (θ = 0°) shown by the phantom line in FIG. 5 as the reference. Specifically, in the present embodiment, the mounting angle θ of the shaft portion 25 is set to an angle of 60° + α, and the position when θ = 60° is the position when the contact acting portion 47 contacts the guide acting surface 49. Further, the additional angle α is the angle when the shaft portion 25 is rotated further in the pressing direction from the position where θ = 60° to apply a pressing force. In the present embodiment, an angle of 5° is assigned as an example of the additional angle α.

[0047] Note that the position of the contact acting portion 47 does not change between when θ = 60° and when θ = 60° + α. However, the range A (the range shown by hatching in FIG. 5) that existed when θ = 60° disappears when θ = 60° + α, and the coil diameter D of the coil portion 41 of the torsion coil spring 24 becomes smaller, and it is in a state of being tightly wound around the shaft portion 25.

[0048] FIG. 6 is a longitudinal front view showing the lock mechanism, and FIG. 7 is a plan view (a) showing the lock mechanism and a cross-sectional view (b) taken along line b - b in the plan view (a).

[0049] As shown in FIGS. 6 and 7, the lock plate 39 is a thick rectangular flat plate-like member and has a rotation shaft 75 that is supported at the base portion in a state where it can rotate by a predetermined angle by a bearing 40. Further, a fitting hole 37 that penetrates in the thickness direction is formed at the center portion of the lock plate 39. The fitting hole 37 is formed to be slightly larger than the diameter of the lock pin 33 in order to facilitate fitting with the lock pin 33. In the present embodiment, as shown in FIG. 7(b), a fitting hole 37 with a play β on the pressing direction side is adopted so that the lock pin 33 can be fitted even when it is inclined by about 6° to 8° from the vertical direction to the pressing direction. In addition, the lock plate 39 is also provided with a finger hook portion 77 for hanging a finger and operating it during rotation.

[0050] In addition, in this embodiment, as shown in FIGS. 3 to 5, at the middle portion in the depth direction Y of the exposed portion 11 of the embedded member 7, two support plates 59, 59 are provided vertically downward from the lower surface of the formwork 15 by using a recess 14 recessed upward in the installation direction Z of the embedded member 7. And at the lower portions outside the width direction X of these two support plates 59, 59, a downward stop shaft 61 formed of, for example, a round bar-shaped member is horizontally attached so as to protrude on both sides (front and rear) in the depth direction Y.

[0051] The support plate 59 is formed of, for example, a thick substantially rectangular steel plate with a thickness of 4.5 mm. Further, as shown in FIG. 4, a pocket portion 63 recessed downward is formed in a part of the upper end surface joined to the lower surface of the formwork 15 of the support plate 59 in accordance with the outer shape of the exposed portion 11 of the embedded member 7 set in the formwork 15. As shown in FIG. 3, two support plates 59 are provided at a predetermined interval in the depth direction Y. As shown in FIG. 4, hole portions 65 are formed at the lower portions near both the left and right ends in the width direction X. And the downward stop shaft 61 is attached in a form penetrating through the two hole portions 65 of the two left and right support plates 59, 59.

[0052] As shown in FIGS. 3 and 4, both ends of the downward stop shaft 61 protruding on both sides (front and rear) in the depth direction Y of the two support plates 59, 59 are in contact with the lower surface 50 (see FIG. 5) of the engaging convex portion 13 formed on the exposed portion 11 of the embedded member 7. Thereby, together with the flange portion 10 provided in the embedded portion 9 of the embedded member 7, the downward movement of the embedded member 7 in the installation direction Z with respect to the formwork 15 is restricted.

[0053] FIG. 11 is a side sectional view showing a usage mode when two sets of positioning and fixing devices 21 are connected and used.

[0054] The positioning and fixing device 21 is installed one by one for each concrete sleeper 1 to be manufactured. As shown in Fig. 11, the shaft portions 25 of a plurality of sets of positioning and fixing devices 21 are connected in two or more sets by a connecting member such as a universal joint 69, so that a plurality of sets of positioning and fixing devices 21 are interlocked, and it is also possible to adopt a usage form in which a plurality of concrete sleepers 1 are manufactured at once. Note that if it is about two connections, centering is necessary, but interlocking is possible without using the universal joint 69.

[0055] Next, with reference to Figs. 3 to 8, the manufacturing process of the concrete structure 1 using the positioning and fixing device 21 of the embedding member of the present invention described above will be described.

[0056] First, the embedding member 7 is installed on the formwork 15. In this case, the lock of the lock mechanism 32 is released, and the shaft portion 25 is rotated clockwise in Fig. 5 so that the contact acting portions 47, 47 of the left and right positioning and fixing devices 21, 21 in the width direction X are respectively moved to positions retracted from the guide acting surface 49.

[0057] Next, with respect to the opening 17 formed in the bottom plate 16 of the formwork 15, with the exposed portion 11 of the embedding member 7 facing down and the embedding portion 9 facing inward, the embedding member 7 is inserted from above. Then, the installation is completed when the lower surface of the flange portion 10 of the embedding portion 9 abuts on the upper surface of the peripheral edge of the opening 17. In this state, the lower surface of the flange portion 10 and the upper surface of the peripheral edge of the opening 17 abut, and it acts as a first installation direction positioning means 67 for restricting the downward movement of the embedding member 7. Also, the lower surface 50 of the engaging convex portion 13 and the downward stop shaft 61 abut, and it acts as a second installation direction positioning means 68 for restricting the downward movement of the embedding member 7.

[0058] Furthermore, in the present embodiment, in this state, the base portion on the inner side in the width direction X of the exposed portion 11 of the embedded member 7 abuts against the inner peripheral surface of the opening 17 of the formwork 15, and serves as a first width-direction positioning means 71 that restricts the movement of the embedded member 7 inward in the width direction X. Also, the outer surface of the exposed portion 11 of the embedded member 7 abuts against the inner surfaces of the two pocket portions 63, 63 formed in the two support plates 59, 59, and serves as a second width-direction positioning means 73 that restricts the movement of the embedded member 7 inward and outward in the width direction X.

[0059] Next, the shaft portion 25 is rotated counterclockwise by a predetermined angle in FIG. 5 so that the abutting action portion 47 of the torsion coil spring 24 abuts against the guiding action surface 49 of the engaging convex portion 13 of the embedded member 7, and further rotated counterclockwise by an additional angle α. As a result, as shown in FIG. 7(b), the lock pin 33 reaches the locked position, and in this state, the lock plate 39 that was lifted upward and shown by the virtual line in FIG. 6 is tilted to the horizontal position shown by the solid line, and the lock pin 33 is fitted into the fitting hole 37 of the lock plate 39.

[0060] When the lock mechanism 32 is in the locked state, the shaft portion 25 cannot rotate, and its mounting angle θ is maintained. And in this state, as shown in FIG. 5, a pushing force F acting inward in the width direction X and a pressing force S acting downward in the installation direction Z act on the embedded member 7 installed in the opening 17 of the formwork 15 by the four positioning means 67, 68, 71, 73. Thereby, the embedded member 7 is surely fixed.

[0061] Also, when the torsion coil spring 24 is worn or damaged, it is replaced with a new torsion coil spring 24. In this case, the lock of the locking mechanism 32 is released in the reverse procedure of the above, and the shaft portion 25 is rotated in the retracting direction. Further, the mounting bolt 51 shown in FIG. 3 is loosened to release the fixing of the retaining ring 31, and the base end locking portion 43 locked to the groove portion 57 of the retaining ring 31 is pulled out to remove the torsion coil spring 24. Thereafter, the base end locking portion 43 of the new torsion coil spring 24 is fitted into the groove portion 57 of the retaining ring 31 in the reverse procedure of the above, and the retaining ring 31 is attached to the shaft portion 25 with the mounting bolt 51. Then, the shaft portion 25 is rotated in the pressing contact direction by a predetermined angle to lock the locking mechanism 32, and the replacement of the torsion coil spring 24 is completed.

[0062] As described above, in the present invention, the positioning and fixing means 23 itself is relatively inexpensive and is constituted by a torsion coil spring 24 having a simple structure. Further, when replacing the positioning and fixing means 23, the replacement work can be performed in a state where the biasing force of the torsion coil spring 24 is not exerted. Therefore, the operator can smoothly perform the replacement work of the positioning and fixing means 23 without feeling a load resistance.

[0063] Next, a reinforcing material such as a reinforcing bar is disposed as required inside the formwork 15 in which a total of four embedding members 7 in two pairs are positioned and fixed by the positioning and fixing device 21, and concrete is placed therein. Thereafter, if cured for a predetermined time, the concrete tie 1 in which a total of four embedding members 7 in two pairs are embedded at correct positions is completed.

[0064] When the concrete has hardened, the lock of the locking mechanism 32 is released and the concrete tie 1 is taken out of the formwork 15. The release of the lock of the locking mechanism 32 is the same as the procedure in the case of replacing the positioning and fixing means 23 described above. After releasing the lock of the locking mechanism 32, the shaft portion 25 is rotated in the retracting direction, and the contact acting portion 47 that has been in contact with the guiding acting surface 49 of the engaging convex portion 13 of the embedding member 7 is retracted from the guiding acting surface 49.

[0065] As a result, the concrete sleeper 1 can be removed from the mold, and by pulling it upward, the concrete sleeper 1 is taken out of the formwork 15. Hereinafter, the same process may be repeated the necessary number of times using the same formwork 15 and the positioning and fixing device 21 for the embedding member.

[0066] According to the positioning and fixing device 21 of the present invention, the pushing force F toward the center in the width direction X, which has been insufficient in the past, and the pressing force S in the installation direction Z are enhanced, and the accurate positioning and reliable fixing of the embedding member 7 in the width direction X and the installation direction Z can be performed. Further, the setting of the pushing force F and the pressing force S of the positioning and fixing means 23 is performed using the setting of the mounting angle θ of the shaft portion 25, and the positioning, fixing, and release thereof can be performed using the rotation operation of the lock plate 39. As a result, the setting work of setting the embedding member 7 with respect to the formwork 15, the demolding work of taking out the concrete structure 1 in which the embedding member 7 is embedded from the formwork 15, and the replacement work of parts such as the positioning and fixing means 23 are facilitated.

[0067] The positioning and fixing device 21 of the present invention is not limited to the configuration described in the above-described embodiment, and various modifications can be made within the scope described in the claims. For example, the positioning and fixing means 23 is not limited to the torsion coil spring 24 described in the above-described embodiment, and other spring materials such as leaf springs can be used as long as they can exhibit the same pushing force F and pressing force S.

[0068] Further, it is also possible to connect the base end locking portions 43 of the two torsion coil springs 24 arranged with the exposed portion 11 of the embedding member 7 interposed therebetween, and provide a continuous single torsion coil spring 24 having two abutting action portions 47, 47 and two coil portions 41, 41 at the center.

Explanation of reference numerals

[0069] 1 Concrete sleeper (concrete structure) 7 Embedding member (shoulder) 9 Embedding portion 10 Flange portion 11 Exposed part 13 Engaging convex part 14 Concave part 15 Mold 21 Positioning and fixing device for embedded member 23 Positioning and fixing means 24 Torsion coil spring 25 Shaft part 27 Support side plate 29 Pipe collar 31 Retaining ring 32 Lock mechanism 33 Lock pin 35 End nut 47 Contact acting part 49 Guide acting surface X Width direction Y Depth direction (longitudinal direction) Z Installation direction (vertical direction) F Pushing force S Pressing force θ Mounting angle

Claims

1. In a positioning and fixing device for an embedded member used when installing a pair of embedded members having an embedded portion with a flange portion at the base and an exposed portion with engaging convex portions at both ends in the depth direction so as to face each other using two openings provided at a predetermined interval in the width direction, it is provided at a position that does not interfere with the embedded member below the opening of the formwork, and has a shaft portion that extends horizontally in the depth direction, and is provided with positioning and fixing means formed by a spring material that abuts against a part of the exposed portion of the embedded member using the shaft portion and applies a pushing force inward in the width direction and a pressing force downward in the installation direction of the embedded member, a part of the exposed portion of the embedded member against which the positioning and fixing means abuts is a guiding action surface that slopes downward outward in the width direction on the upper surfaces of the engaging convex portions provided at both ends in the depth direction of the exposed portion, the positioning and fixing means is a torsion coil spring, the torsion coil spring, has a coil portion that fits externally on the shaft portion, a base end locking portion provided at one end of the coil portion and fixed to the shaft portion, and a contact action portion provided at the tip of an arm portion extending from the other end of the coil portion and contacting the guiding action surface, and is characterized in being a positioning and fixing device for an embedded member.

2. The positioning and fixing means is provided in a pair on both sides in the depth direction with the exposed portion of the embedded member sandwiched therebetween so as to face each other, each of the pair of positioning and fixing means, is provided in a state of fitting externally on an intermediate portion of the shaft portion, and is a pipe collar that is somewhat longer than the length in the depth direction of the exposed portion of the embedded member, and is provided with a pair of retaining rings that fit externally on the shaft portion at positions close to the outer sides of both end faces of the pipe collar and sandwich the positioning and fixing means from the outside, and is characterized in being the positioning and fixing device for an embedded member according to Claim 1.

3. The positioning and fixing means is formed using a linear material having a wire diameter of 3 mm to 5 mm, and is characterized in being the positioning and fixing device for an embedded member according to Claim 1 or 2.

4. An end nut provided at at least one end of the shaft portion and having a lock pin attached so as to project radially for setting the attachment angle of the shaft portion, A positioning and fixing device for an embedding member according to any one of claims 1 to 3, characterized by comprising a lock plate provided on an outer surface of a support side plate provided on a lower surface of the formwork so as to be rotatable up and down, and having a fitting hole into which the lock pin is fitted.

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