JP2002339356A - Fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening device which is connected integrally to an end of a reinforcing rod stock such as an anchor and which can inhibit looseness of a fastening part by imparting a fixed tensible force to the reinforcing rod stock while following extension of the reinforcing bar stock when the reinforcing rod stock is extended. SOLUTION: A load imparting slab 20 is pressed to a side of ground y by a coned disc spring 4 via a locking tool 6 held by an end of an extension rod stock B, so as to resist a loading force acting outward from the side of the ground y. In addition, a screw part 5 is provided at a lower end of the rod stock B in such a manner as to sandwich the slab 20 in between, and a turning force in a direction, wherein the slab 20 is pressed to the side of the ground y via a power spring 9, is applied to a main nut 3, which is screwed into the screw part 5 and brought into contact with a surface of the slab 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for locking an end (head) of a ground anchor (hereinafter, also referred to as an earth anchor) hammered into the ground, and a rolling device for compacting the ground such as an embankment layer. A fastening device at the end of the anchor to maintain tension on the anchor with the force applied,
Ends (heads) of reinforcing rods (including wires such as wires) such as anchors and tie rods that are used as load applying devices for applying a constant load to connect the connection points while maintaining a predetermined connection force )).

[0002]

2. Description of the Related Art The above-mentioned device for locking the head of an earth anchor has a structure in which a double nut is screwed into a male screw portion provided on the head of the earth anchor so that the two nuts are not loosened from each other. (Anchor bolts, foundation bolts) are common. There is also a structure in which a spring material is interposed under a nut screwed to the head of the anchor to apply a constant rolling force in a tightened state.

[0003] In addition, as shown in FIG. 9, if there is a portion of the reinforcing rod 51 such as an anchor or a tie rod projecting to the ground, a) threading the projection 52 to a plate 53 and tightening it with a nut 54. Structure, b)
A structure in which the head of a reinforcing rod material such as an anchor is bent into an L shape and embedded in a protective work provided on a slope, and a grout anchor body (hereinafter referred to as an anchor) formed by grout 60 reinforces fragile ground and the like. In this case, in order to carefully prevent corrosion of the anchor head 52 projecting to the ground surface, the fastening nut 54 screwed to the screw portion of the anchor head 52 is tightened, and c) as shown in FIG. 9A. A structure in which the entire head is covered with a cap 55 and a sealing material 56 is filled in the cap 55 to prevent humus, or d) FIG. 9 (b)
As shown in FIG. 7, the entire head is covered with a cap 55 and the cap 55 is filled with rust-preventive oil 57, and the anchor portion on the opposite side of the backing plate 53 is also sealed with a steel duct 58 and a seal 59.
There is a structure for preventing humus by filling with a rust-preventive oil 57. By applying such a structure, the tensile force of the reinforcing rod 51 such as an anchor or a tie rod can be held for a long time.

[0004] The applicant of the present invention automatically applies a rolling force when the ground surface is lowered due to loosening of the ground such as embankment or the like, and follows the descent of the ground surface. A patent application (2000-141791) has been developed for a fastening device that uses a ball screw portion and a ball nut for preventing the rise against the rise.

[0005]

However, there is room for improvement in the following points in the above-mentioned conventional fastening device. That is, for example, a thin multi-layered embankment layer horizontally stacked on a high-rigidity foundation (including a foundation such as a bedrock) described in Japanese Patent No. 2895401 is flattened between each embankment layer. Intermediate or grid-like reinforcing materials are interposed and laminated, and a high-rigid floor slab is installed on the uppermost embankment layer, and a plurality of anchors that vertically penetrate the high-rigid floor slab and each reinforcing material are provided. Connect the floor slab and the foundation with tie rods,
There is a foundation construction by embankment that applies a compressive force to the entire embankment layer via the anchors and tie rods and integrates each embankment layer and reinforcing material from a highly rigid floor slab to the foundation.

A high-rigid floor slab is formed on the uppermost embankment layer of the foundation structure, and the lower ends of a plurality of anchors and tie rods are vertically penetrated through the high-rigid floor slab and the reinforcing members. A state in which a compressive force is applied to the entire embankment layer by fixing the anchors and tie rods respectively to the threaded portions of the anchor heads via high-rigid floor slabs by fixing the anchors and the tie rods to the base support. If the embankment is held for a long time, the thickness of the entire layer may decrease due to partial deterioration of the embankment layer, a compression phenomenon over the entire layer, seismic motion, or the like. In such a case, a gap is generated between the nut and the floor slab, and the tension applied to the anchor or the tie rod disappears. And if this state continues for a long time, there is a possibility that a part of the basic building may collapse.

[0007] If a steel reinforcing rod or a wire (including a wire) used for an anchor, a tie rod, an anchor bolt, or the like is subjected to a long term tension or tensile force, the reinforcing rod (wire ) Grows,
The fastening portion of the head may be loosened, and in these cases, a gap is formed below the nut screwing portion at the end, and the tension applied to the reinforcing rod is lost. Then, loosening of the nut may occur, or in the case of an anchor bolt for installation of a machine, the installation location may be loosened and the power machine or the like may vibrate.

The fastening device according to the prior application of the present applicant uses a ball screw portion and a ball nut to reduce rotational resistance, and thus has a complicated structure. Therefore, the fastening device has several hundred kilonewtons (several tens tons). When a rolling force of several thousand kilonewtons (hundreds of tons) is applied to the embankment, or conversely, to counter the force of several hundred kilonewtons to several thousand kilonewtons from the embankment, the outer diameter of the ball screw part is reduced. As well as the remarkable increase, the diameter of the ball loaded in the female thread and the inner and outer diameters of the ball nut also need to be increased, which increases the production cost,
In addition, since it takes many days to manufacture, it is difficult to mass-produce.

The present invention has been made in view of the above points, and is integrally connected to an end of a reinforcing rod such as an anchor or a tie rod, for example, when the reinforcing rod expands or the load applying plate descends. If a gap is formed between the fastening bar and the fastening bar, the gap can be automatically eliminated following the extension of the reinforcing bar, and a constant tension is always applied to the reinforcing bar to secure the fastening bar. It is an object of the present invention to provide a fastening device which can prevent loosening of the screw, has a simple structure and is inexpensive to manufacture.

[0010]

In order to achieve the above object, a fastening device according to the present invention comprises: a) applying a tension to a reinforcing rod material such as an anchor or a tie rod; A fastening device integrally connected to one end of the reinforcing bar, which is used for applying a rolling force through a member, and b) connecting one end of the reinforcing bar to a surface of the ground. Penetrate the load applying plate to be installed at
An elastic body such as a spring or a rubber plate, a pressure generating member formed of a hydraulic cylinder, etc., presses the load applying plate toward the ground side through a locking tool held or fixed at an end of the extended bar, Holding the load applying plate in a fixed position by countering the load force from the ground side to the outside, and c)
A threaded portion is provided at the reinforcing bar, the extending bar, or a connecting portion of these bars with the load applying plate interposed therebetween, and the main portion is screwed to the screw portion and brought into contact with the surface of the load applying plate. It is characterized in that a rotational force in a direction of pressing the load applying plate toward the ground is applied to the nut.

According to the fastening device of the present invention having the above-described structure, the reaction force from the embankment or the like to the tension or the rolling force applied to the reinforcing rod acts on the load applying plate. When the tension or the rolling force applied to the plate changes, the reaction force acting on the load applying plate changes. As a result, the load applying plate tends to move in the axial direction with respect to the reinforcing bar. If this direction is the biasing direction of a pressure generating member such as an elastic body such as a spring or a rubber plate, the load applying plate descends with respect to the reinforcing bar, so that the pressure generating member such as the spring extends, Although a gap is likely to be formed between the nut and the load applying plate, a force for rotating the main nut in the tightening direction is applied, and the main nut automatically rotates so as to eliminate the gap. Then, when the main nut contacts the load applying plate by rotating in the tightening direction, the rotation of the main nut stops. As a result, the tension applied to the reinforcing bar is prevented from disappearing.

On the other hand, even if the ground expands and the load applying plate tries to rise with respect to the reinforcing bar, on the other hand, since the main nut screwed into the threaded portion is in contact with the load applying plate, the load applying plate is in contact with the load applying plate. The plate is prevented from rising by the main nut. For this reason, the load applying plate is not lifted, no gap is formed between the main nut and the load applying plate, and the tension applied to the reinforcing bar does not disappear. As a result, for example, the ground such as embankment is prevented from collapsing due to the loss of the tension of the reinforcing bar or the like.

[0013] Further, for example, by providing marks or the like at intervals along the axial direction of the reinforcing rod or the extending rod, the positions of the main nut and the load applying plate can be easily confirmed. From this result, it is possible to easily infer the state of subsidence of the ground, the state of extension of the reinforcing rod, and the like.

Further, the fastening device of the present invention does not use any complicated parts such as a ball screw and a ball nut, has a simple structure, is inexpensive to manufacture, and has a large size of several tens to hundreds of tons. Even in applications where a load is applied to the ground or the like, the outer diameter of a bar or a screw portion, the inner diameter of a main nut, a spring pressure, and the like are increased according to a required load, and can be easily handled.

FIG. 8 is a drawing for explaining the basic principle of the fastening device according to the present invention. As shown in FIG.
A load applying plate 20 is installed on the surface of the ground y, and coil springs 4 are wound around a plurality of anchors or tie rods (hereinafter, referred to as anchors) A penetrating the load applying plate 20, respectively. The coil spring 4 is contracted between the load applying plate 20 through the tightening nut 10 and the washer-shaped locking member 6 screwed to the screw portion 8 at the upper end of the first member.
After a rolling force of kN (kilo Newton) is applied to the ground y via the load applying plate 20, the tightening nut 10 is loosened to allow an allowable load of 1000 kN (kilo Newton).
And the balance with the ground y is maintained. The lower end of each anchor A is fixed to a foundation (for example, a concrete foundation) 23 (z) below the ground y. Further, a plurality of screw rods B having a lower end fixed to the base body 23 parallel to the anchor A and penetrating the load applying plate 20 upward are provided, and a main nut is attached to the screw portion 5 of each of these screw rods B. 3 is screwed and urged in the tightening direction by a mainspring 9 and the like. Therefore, when the ground y sinks, the load applying plate 20 receives the rolling force of the coil spring 4 and descends following the sinking of the ground y. As a result, a gap is formed between the main nut 3 and the load applying plate 20, so that no load acts on the main nut 3 and the main nut 3 can be rotated with an extremely small force. Then, the main nut 3 starts rotating in the tightening direction under the urging force of the spring 9 or the like, and the load applying plate 20
The rotation stops when it comes into contact with. As a result, the load applying plate 20
The gap between the main nut 3 and the main nut 3 is maintained even when a force that pushes up the load applying plate 20 due to expansion of the ground y acts.
Does not rotate in the direction opposite to the tightening direction, so that the load applying plate 20 does not lift. The present invention described above (Claim 1)
Is based on the same principle, but is further developed by anchoring the main nut 3 with the anchor A having the tightening nut 10 and the spring 4 and the spring 9
By combining and integrating the screw rod B urged in the tightening direction, the structure is simplified, the number of components is minimized, and the size is reduced.

In the fastening device according to the second aspect of the present invention, the locking tool has a hole through which an end of the extended bar is penetrated, and a second screw portion is attached to the end of the extended bar. By providing one surface of the tightening nut screwed into the second threaded portion in contact with the periphery of the hole on the surface of the locking tool and tightening, the locking tool is held at the end of the extending bar. I have.

According to the second aspect of the present invention, the pressure (roll-down force) generated by further compressing the pressure generating member such as an elastic body such as a spring or a rubber plate by tightening the tightening nut can be increased. If the pressure generated by the pressure generating member such as an elastic body such as a spring or a rubber plate is reduced more than specified, the tightening nut is tightened to increase the tension applied to the reinforcing bar and re-tense. be able to.

According to a third aspect of the present invention, an annular support is provided around the main nut, which is screwed to the screw portion, at a constant radial distance around the entire circumference. The main nut can be urged in the tightening direction by a mainspring that is fixed on the surface of the application plate and inserted into the space between the main nut and the support. More specifically, one end of the mainspring is fixed to the support, and the other end is fixed to the main nut, whereby the main nut is urged in the tightening direction.

According to the third aspect of the present invention, if the load applying plate descends due to, for example, subsidence of the ground and a gap is formed between the plate and the main nut, the main nut rotates in the tightening direction to apply the load. Touch the plate again. As a result, the load applying plate is held by the main nut at the lowered position,
Conversely, even if the ground expands or the like, the load applying plate does not rise, and loosening of the reinforcing bar is also prevented.

According to a fourth aspect of the present invention, one end of the tow line is fixed to the main nut screwed into the screw portion, and the tow line is wound around the main nut a plurality of times in the tightening direction. By attaching a weight to the other end of the tow line, the main nut can be urged in the tightening direction. Further, for example, a through hole is provided in the load applying plate, a hollow tube is buried vertically in the ground, and a weight attached to the other end of the tow line is inserted into the hollow tube via a guide roller or the like. Thus, the gravity of the weight can be imparted to the tow line.

According to the fastening device of the fourth aspect, similarly to the device of the third aspect, if the load applying plate descends due to, for example, subsidence of the ground, and a gap is formed between the plate and the main nut, the main assembly may have a gap. The nut rotates in the tightening direction under the gravity of the weight via the towing line and comes into contact with the load applying plate again.

According to a fifth aspect of the present invention, a ratchet main body is attached to the main nut screwed to the screw portion so as to be integrally rotatable, and a ratchet pawl capable of meshing with the teeth of the ratchet main body is attached to the load applying plate or the load applying plate. It is preferable that the support is axially attached to the support and biased in the engagement direction.

According to the fifth aspect of the present invention, the ratchet body is loosened together with the main nut even if the main nut tries to rotate in a direction in which the main nut is loosened due to a resonance phenomenon between the main nut and the bolt due to, for example, high-frequency micro-vibration. When trying to rotate in the direction, the ratchet claw meshes with the teeth of the ratchet body,
Since the rotation of the main nut in the loosening direction is prevented, the main nut will not be loosened even if a high-frequency minute vibration or the like acts to cause a resonance phenomenon.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fastening device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view schematically showing the entire foundation structure provided with the fastening device of FIG. 2, and a part of the foundation structure is omitted. FIG. 2 is a central longitudinal sectional view showing an embodiment of the fastening device of the present invention integrally connected to the upper end of the anchor.
FIG. 3 is a sectional view taken along line bb of FIG. 2.

As shown in FIGS. 1 and 2, the fastening device 1 of this embodiment is provided above an anchor (reinforcing bar) A. The anchor A is constructed by embankment described in Japanese Patent No. 2597116. Are used in the body y,
A fastening device 1 is provided above each anchor A.

As shown in FIG. 6, this basic construct y
A thin multi-layered embankment layer 24 horizontally stacked on a high-rigidity foundation (including a foundation such as a bedrock) 23 is interposed between each embankment layer 24 with a flat net-like or grid-like reinforcing material 25. A high rigidity load applying plate (top plate) 20 is installed on the uppermost embankment layer 24 by stacking, and a plurality of anchors A vertically penetrating the load applying plate 20 and each reinforcing member 25 are used to apply the load applying plate 20. And the foundation 23 are connected to each other, a compressive force is applied to the entire embankment layer 24 via the anchors A, and the embankment layer 24 and the reinforcing material 25 from the high-rigidity load applying plate 20 to the foundation 23 (z) are separated. It is formed by integrating. Reference numeral 21 denotes a through hole formed in the load applying plate 20, and the head of the anchor A projects upward from the through hole 21. In addition, the reference numeral 26 in FIG. 1 denotes a nut screwed to the lower end screw portion of the anchor A.

As shown in FIG. 1 or FIG. 2, the upper part B of the anchor A is made of an extending bar in which the anchor A is extended upward. The extended bar B has a large-diameter portion B1 having the same outer diameter as the anchor A, and a portion B2 above the large-diameter portion B1.
Has a slightly smaller outer diameter. The fastening device 1 includes a cylindrical mounting base 2 having an open lower end, and pedestals 11 are integrally formed on both lower ends of the mounting base 2.
Are mounted on the load applying plate 20 by a plurality of setscrews 12 penetrating through. Although only one fastening device 1 is shown in FIG. 1, the number of the fastening devices 1 corresponds to the number of the anchors A, and the fastening device 1 is installed on each anchor A.

At the center of the upper surface of the mounting table 2, an opening 13 for penetrating an extension bar B described later is formed.
A large number of annular disc springs 4 are stacked and mounted on the mounting table 2, and an annular pedestal 15 is mounted on these disc springs 4.
Are integrally provided at the lower end and a substantially cylindrical locking tool 6 having an open lower end is arranged. At the center of the upper surface of the locking member 6, an opening 16 for penetrating an extension bar B described later is formed. A cylindrical guide sleeve 7 having open upper and lower ends is integrally fixed by a set screw 17 around the opening 13 on the upper surface of the installation table 2.

On the other hand, a (male) screw portion 5 is formed around the upper end portion of the anchor A and the large diameter portion B1 of the extending bar B connected thereto, and the main nut 3 is screwed into the screw portion 5. Is done. The main nut 3 is a two-stage nut in which a small-diameter portion 3b is integrally connected to a large-diameter portion 3a having a slightly larger outer diameter. A second (male) screw portion 8 is formed around the upper end of the upper portion B2 of the extending bar B. The second screw 8 protrudes upward from the opening 16 of the locking device 6 and is covered by the locking device 6 so as to press the upper surface of the disc springs 4 stacked on the pedestal 15 at the lower end of the locking device 8. The tightening nut 10 is screwed and screwed to the screw portion 8 via the washer 10a.

Around the lower large-diameter portion 3a of the main nut 3, there are provided a plurality of stoppers 18 each having an annular recess 18a on the inner side at a slight distance in the radial direction over the entire circumference. It is fixed around the through hole 21 on the load applying plate 20 by the screw 19. A mainspring spring 9 is inserted into a space (space) between the main nut 3 and the concave portion 18a of the support body 18, and one end 9a of the mainspring 9 is connected to the support body 18 and the other end 9b is connected to the main body. Each is fixed to the nut 3. After the mainspring 9 has been rotated in the direction of exerting a biasing force on the main nut 3 in the tightening direction, the other end of the mainspring 9 is fixed to the main nut 3. Therefore, a biasing force in the tightening direction is applied to the main nut 3 by the mainspring 9.
Since the lower surface of the main nut 3 is in contact with the surface of the load applying plate 20, the main nut 3 does not rotate. Note that FIG.
Reference numeral 9c in the middle is a circular cover that covers the upper surface of the mainspring 9.

However, for example, in FIG. 1, the embankment y sinks and the load applying plate 20 descends by receiving the rolling force by the urging force of the disc spring 4, so that the main nut 3 and the load applying plate 2 are lowered.
0, the main nut 3 rotates in a direction to be tightened by the biasing force of the mainspring spring 9, and the load applying plate 2
When it comes into contact with 0, there is no gap and rotation stops. That is, the rolling force from the disc spring 4 acts on the embankment y through the anchor A, and the embankment y has a predetermined value (in this example, always 1000
kN). On the other hand, embankment y
As a result, the pressing force of the disc spring 4 acts on the reaction force (push-up force) acting on the load applying plate 20, and the two are balanced. In addition, the embankment y expands and the like,
When a push-up force exceeding the rolling force (here, 1000 kN) of the disc spring 4 acts on 0, the main nut 3 screwed to the screw portion 5 prevents the load applying plate 20 from rising.

FIG. 4 shows a model of the fastening device 1 of this embodiment, in which a coil spring 27 wound around an anchor A generates a reaction force against the disc spring 4 on the embankment y side. In this model, the disc spring 4 is omitted. A screw portion 5 is formed around the upper end portion of the anchor A and the extending bar B continuous thereto, and the main nut 3 is screwed to the screw portion 5, and between the main nut 3 and the annular support 18. The main spring 3 is urged by the mainspring 9 in the tightening direction. 4A is a perspective view showing a state immediately after the application of prestress, FIG. 4C is a plan view of the same, FIG. 4B is a perspective view showing a state in which the embankment y has settled, and FIG. FIG.

As described above, if the fastening device 1 of the present invention is attached to each anchor A, the anchor A always has a predetermined size (1000
kN) is applied and a predetermined (100
0 kN) is applied, and for example, even if the embankment y sinks, deteriorates, or elongates the anchor A, the tension on the anchor A does not disappear.

FIG. 5 shows another embodiment of the fastening device. FIG. 5 (a) is a longitudinal sectional view at the center, and FIG.
It is a bb line sectional view of (a). As shown in these figures, the difference between the fastening device 1 'of the present embodiment and the fastening device 1 of the twelfth embodiment is that the main nut 3 is prevented from rotating in the direction opposite to the fastening direction. Means.
That is, the ratchet mechanism 35 is provided. The ratchet mechanism 35 includes a ratchet body 36 having meshing teeth 36a formed at equal intervals in the circumferential direction, and the teeth 36a.
The main nut 3 is mounted around the upper end of the main nut 3 so as to be able to rotate integrally with the main nut 3. On the other hand, the ratchet claw 37 has its base end rotatably mounted on the support 18 by a support shaft 38, and is urged by a spring (not shown) in a direction in which it meshes with the teeth 36a of the ratchet body 36. . Other configurations and operations are the same as those of the fastening device 1 of the first embodiment, so that the description thereof will be omitted, and common members will be illustrated using the same reference numerals as those of the above-described embodiment.

FIG. 7 shows another embodiment of the fastening device. The difference between the fastening device 1 "of the present embodiment and the fastening devices 1.1 'of the first and second embodiments is as follows. That is, the gravity of the weight 42 is used as means for urging the main nut 3 in the tightening direction, that is, one end of the tow line 41 is stopped on the outer peripheral surface of the main nut 3 as shown in FIG. After being put on, the other end of the towing line 41 is wound around the outer peripheral surface of the small diameter portion 3b a plurality of times, and then the weight 42 is attached to the other end of the towing line 41.
A guide pulley 43 is mounted in the installation table 2 via a bracket 44. The load applying plate 20 has another through hole 2
2, a long (for example, 0.5 to 1.0 m), bottomed hollow pipe 45 is press-fitted in the embankment y in the vertical direction so as to be communicated with the through hole 22, and a guide pulley is provided. The weight 42 at one end of the towing line 41 passed through 43 is inserted into the hollow pipe 45 from the through hole 22. This allows
The main nut 3 receives an urging force corresponding to the gravity (load) of the weight 42 and is urged in the tightening direction. In the case of this example, when the load applying board 20 is lowered, the main nut 3 rotates in the tightening direction by the maximum number of windings of the towing line 41. Other configurations and operations are the same as those of the fastening device 1 of the first embodiment, so that the description thereof will be omitted, and common members will be illustrated using the same reference numerals as those of the above-described embodiment. (Other Embodiments) Three embodiments of the fastening device according to the present invention have been described above. However, the entirety of the fastening device 1.1 ′ 1 ″ is set so as not to rust even if exposed to wind and rain for a long period of time. Can be covered with a cover 40 (see FIG. 6),
In this case, it is desirable to use a transparent body for the cover 40 because the position of the main nut 3 on the extending bar B and the expansion and contraction state of the disc spring 4 can be easily grasped. It goes without saying that a coil spring can be used in place of the disc spring 4, a leaf spring formed by laminating two or more spring plates, or an elastic body such as a laminate of rubber plates can be used. However, in some cases, a hydraulic cylinder can be used instead of the elastic body. Further, the screw portion 5 for screwing the main nut 3 can be formed so as to straddle the end of the anchor A or a continuous portion between the anchor A and the extending bar B.

Furthermore, in addition to the flat ground y such as an embankment layer, the fastening device according to the present invention can also be used for slopes of landslides or landslides which may cause landslides, landslides, etc., or falling rocks. By fixing one end of the tie rod to the foundation in the ground, and projecting the other end from the ground slope, and connecting a fastening device to this protruding end, the ground is inclined. Landslides and landslides can be prevented by preventing the looseness of the tension applied to the landslide.

[0038]

As is apparent from the above description,
The fastening device according to the present invention has the following excellent effects.

(1) The first aspect of the present invention is provided so as to be connected to the end (head) of a reinforcing rod such as an anchor or a tie rod, so that the structure is simple, lightweight and compact. When the load-applying plate elongates or the load-applying plate moves downward to create a gap with the fastening portion, or when the reinforcing bar is contracted or the load-applying plate tries to move upward, The gap can be automatically eliminated following the elongation, and the tightening portion can be prevented from loosening by always applying a constant tension to the reinforcing bar. Therefore, there is no gap between the fastening portion of the head of the reinforcing bar and the load applying plate, and the tension applied to the reinforcing bar is prevented from disappearing. In addition, the degree of loosening of the fastening part can be easily determined by the rotation angle and axial position of the main nut or the degree of extension of the spring or elastic body. A state such as expansion can be estimated. Further, when the spring or the elastic body is extended beyond a prescribed value, the tightening nut can be tightened to re-tension.

Moreover, the fastening device of the present invention does not use any complicated parts such as a ball screw and a ball nut, and has a simple structure, so that the entire device can be reduced in size and weight and has excellent durability. Even if a large load of several tens to hundreds of tons is applied to the ground, etc., the production cost is low, and the outer diameter of the bar and screw, the inner diameter of the main nut, the spring pressure, etc. And can be easily handled.

(2) According to the second aspect of the present invention, since the spring and the elastic body can be further compressed by tightening the tightening nut to increase the generated pressure, the pressure generated by the spring and the elastic body is more than specified. In the case of a decrease, the tightening nut can be tightened to increase the tension applied to the reinforcing bar and re-tensed.

(3) According to the third aspect of the present invention, if the load applying plate descends due to, for example, subsidence of the ground and a gap is formed between the main nut and the main plate, the main nut rotates in the tightening direction to rotate the load applying plate. Contact again. As a result, the load applying plate is held by the main nut at the lowered position, so that even if the ground expands, the load applying plate does not rise and the reinforcing bar is prevented from loosening.

(4) According to the fourth aspect of the present invention, similarly to the apparatus according to the third aspect, when the load applying plate descends due to the settlement of the ground and a gap is formed between the plate and the main nut, for example, Since the nut rotates in the tightening direction under the gravity of the weight and comes into contact with the load applying plate again, even if the ground expands, the load applying plate does not rise and the reinforcing rod is prevented from loosening. You. In addition, unlike the spring force of the mainspring or the like, the spring does not deteriorate or the spring force is weakened even after a long period of time, and the urging force necessary for rotating the main nut can be always held.

(5) According to the fifth aspect of the present invention, even if the main nut tries to rotate in the loosening direction due to resonance due to, for example, high-frequency micro-vibration, the ratchet body integral with the main nut tries to rotate in the loosening direction. Since the ratchet pawl meshes with the teeth of the ratchet body and prevents rotation of the main nut in the loosening direction, the main nut is securely prevented from loosening even if a high frequency micro-vibration or the like causes a resonance phenomenon. You.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing an entire foundation structure provided with the fastening device of FIG. 2, in which a part of the foundation structure is omitted.

FIG. 2 is a central longitudinal sectional view showing a first embodiment of the fastening device of the present invention integrally connected to an upper end of an anchor.

FIG. 3 is a sectional view taken along line bb of FIG. 2;

FIG. 4 is a model of the fastening device 1 of the present embodiment,
4A is a perspective view showing a state immediately after the application of prestress, FIG. 4C is a plan view of the same, FIG. 4B is a perspective view showing a state in which the embankment y has settled, and FIG. It is a top view.

5 shows a second embodiment of the fastening device, FIG. 5 (a) is a longitudinal sectional view at the center, and FIG. 5 (b) is b in FIG. 5 (a).
It is a -b line sectional view.

FIG. 6: Concrete foundation 2 from concrete slab 20
3 is a longitudinal sectional view schematically showing a state where the fastening device of the present invention is applied to a foundation structure y in which each embankment layer 24 and a reinforcing material 25 are integrated.

FIG. 7 shows a third embodiment of the fastening device of the present invention,
It is a center longitudinal cross-sectional view showing the state integrally connected to the upper end of the anchor.

FIG. 8 is a partially cut-away front view and a plan view enlarging a part of a mainspring for explaining the basic principle of the fastening device according to the present invention.

FIGS. 9A and 9B are cross-sectional views showing a conventional general humus preventing structure.

[Explanation of symbols]

 1.1'-1 "Tightening device 2 Installation stand 3 Main nut 4 Belleville spring 5.8 Screw part 6 Locking tool 7.7 'Guide sleeve 9 Spring spring 10 Tightening nut 11.15 Pedestal 13.16 Opening 12.17.19 Set screw 18 Annular support 20 Load applying plate 21.22 Through hole 23 Base body (anchor fixing part) 41 Towing line 42 Weight 43 Guide pulley 44 Bracket 45 Hollow pipe A Anchor (reinforcing rod) B Extended bar material B1 Large diameter part B2 Upper part y Foundation structure

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasuyuki Kitano 5-7-11 Ibukidai Nishicho, Nishi-ku, Kobe-shi, Hyogo F-term (reference) 2D041 GA01 GA05 GC13 GC14

Claims (5)

[Claims] 1. The reinforcing rod material used for imparting tension to a reinforcing rod material such as an anchor or a tie rod or applying a rolling force to a ground such as embankment via the reinforcing rod material. A fastening device integrally connected to one end, wherein one end of the reinforcing bar extends outward through a load applying plate installed on a surface of the ground, and an end of the extended bar is provided. An elastic body such as a spring or a rubber plate, a pressure generating member composed of a hydraulic cylinder, or the like, presses the load applying plate toward the ground side via a locking member held or fixed to the ground, and loads the ground outward from the ground side. While holding the load applying plate in place by opposing the force, a screw portion is provided at the reinforcing bar, the extended bar, or a connecting portion of the bars with the load applying plate interposed therebetween. Part and contact the surface of the load applying plate. Fastening system, wherein with respect to the main nut is that the load applying plate added with rotational force in the direction of pressing to the ground side. 2. The locking device has a hole through which an end of the extended bar is penetrated, and a second threaded portion is provided at an end of the extended bar, and the second threaded portion is provided in the second threaded portion. The fastening according to claim 1, wherein one surface of the tightening nut to be screwed is brought into contact with a periphery of the through hole on the surface of the locking tool and tightened to hold the locking tool at an end of the extending bar. apparatus. 3. An annular support is fixedly mounted on the surface of the load applying plate around the main nut screwed to the screw portion with a constant radial distance around the entire circumference thereof. 3. The tightening device according to claim 1, wherein the main nut is urged in a tightening direction by a mainspring inserted into a space between the support and the support. 4. An end of a tow line is fastened to a main nut screwed into the screw portion, and the tow line is wound around the main nut a plurality of times in the tightening direction. 3. The fastening device according to claim 1, wherein a weight is attached to the main body, and the main nut is urged in a tightening direction. 5. A ratchet body is rotatably attached to a main nut screwed into said screw portion, and a ratchet pawl capable of meshing with teeth of said ratchet body is axially mounted on said load applying plate or said support. Claims 1 to 7 urged in the meshing direction
5. The fastening device according to any one of claims 4 to 7.