JP4165968B2 - Concrete block connection method and binding device used for concrete block connection. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a concrete block connecting method that enables easy and reliable connection of a plurality of concrete blocks in contact with each other by introducing prestress, and also relates to a fastening device used for connecting concrete blocks. It is.
[0002]
[Prior art]
In order to improve the stability of the connection state of the concrete blocks, as a conventional general connection method in which the concrete blocks are connected by introducing pre-stresses, for example, in the insertion hole of a box culvert that is a concrete block A connecting method for inserting a PC steel rod, fixing one end of the PC steel rod to a box culvert at one end, and tensioning the other end of the PC steel rod with a hydraulic jack to fix it to the box culvert at the other end. Are known.
[0003]
In this connection method, when fixing the other end of the PC steel rod, a nut is temporarily screwed into the protruding screw shaft portion of the PC steel rod protruding from the insertion hole, and the nut is pulled to the screw shaft portion via a coupler. After connecting the rods, pulling the tow rod with a hydraulic jack and screwing and fixing the temporarily screwed nut, the work of removing the coupler, the tow rod and the hydraulic jack is performed. By repeating, the prestress was introduced and the box culverts were sequentially connected.
[0004]
However, when using such a connecting method, a large amount of labor was required for fixing the PC steel rod as described above, and a countermeasure for speeding up the work was desired. In addition, a large amount of extra excavation is necessary to secure a certain working space for connecting and removing the tow bar and arranging the hydraulic jack, and the excavation and backfilling operations require a lot of labor and time. was there.
[0005]
In view of this, as one of the problems of the conventional connecting method, a connecting method disclosed in Japanese Patent Laid-Open No. 7-48868 has been proposed. As shown in FIGS. 16 to 17, the connecting method is to fix one end b of the PC steel rod a to a box culvert c at one end and a screw shaft portion e forming the other end d of the PC steel rod. Of the insertion hole g in the other end box culvert f at the hole end k at the inner end face j of the connecting recess h, and a friction reducing member m as a thrust ball bearing or the like is provided on the protruding screw shaft e. The fixing nut n is screwed in between, and the fixing nut n is tightened toward the hole end k, whereby the box culvert f at the other end is tightly coupled to the box culvert c at the one end. .
[0006]
By adopting such a configuration, the resistance to the rotation operation of the fixed nut at the time of fixing the other end of the PC steel rod is reduced by the friction reducing member m, and most of the nut operation force is reduced to the other end. Thus, the box culvert f can be effectively used as a binding force, and the box culverts are securely connected to each other without using a special jack. As a result, it is possible to reduce the time and labor of the connection with the PC steel bar, the connection and removal of the tow bar, the installation and removal of the hydraulic jack, and the excavation and backfilling of the ground without the need for the excessive excavation. It was intended to reduce the labor and time required.
[0007]
[Problems to be solved by the invention]
The above-mentioned connection method that introduces prestress by tightening the fixing nut with a friction reducing member interposed therebetween reduces the number of connection work steps and the time and labor of excavation and backfilling of the ground. Although it solves the problem of connecting construction with jacks, the following problems still remain in terms of introducing prestress.
[0008]
(1) The PC steel rod a inserted through the insertion hole connected to each laying box culvert has a positional deviation or a step difference between adjacent box culverts due to the laying error of the box culvert, for example, as shown in FIG. Since the axis q of the protruding portion of the PC steel rod protruding from the hole end k of the insertion hole g at the inner end surface j of the connecting recess h is the inner end surface of the connecting recess h, as shown in FIG. It is difficult to present a right angle with j.
Therefore, the friction reducing member m makes point contact with the peripheral portion (the inner end surface) s of the hole end k at a portion r of the peripheral edge thereof. Therefore, when the fixing nut n is tightened, the frictional resistance between the screw shaft portion e and the screw portion of the fixing nut n is increased, and the tightening force of the fixing nut n cannot be effectively used for tightening the box culvert, There was a problem that sufficient prestress could not be introduced reliably.
If the diameter of the insertion hole g is increased, it will be possible to dispose the PC steel bar at right angles to the inner end face j without being affected by the laying error. When the diameter is increased, in the case of the precast concrete block, since the member thickness is formed thin, a defect that causes a decrease in the member strength occurs.
[0009]
(2) In the above case, the screw parts are brought into close contact with each other due to the local pressure contact between the screw parts due to the excessive rotation of the fixing nut, and the fixing nut cannot be rotated. There was a fear. In such a situation, the PC steel bar must be cut and removed, and then the connection work must be performed again. To do so, the concrete surface is broken and the PC steel bar cut part is removed. There is a problem that it takes a lot of labor and time to be exposed. Further, since the concrete surface is broken, there is a problem that the strength of the box culvert is reduced.
[0010]
(3) Furthermore, when the fixing nut is tightened and the PC steel rod is fixed, the fixing nut is in direct contact with the friction reducing member. As a result, the fixing nut is loosened, and the tension of the PC steel bar is weakened, and the effect of introducing prestress is reduced.
[0011]
(4) In addition, when connecting box culverts, tightening work is performed using a torque wrench inside the culvert, but if the internal space is narrow, the torque wrench is not rotated. Therefore, depending on the size of the box culvert, there is also a problem that the connecting method cannot be adopted because a required work space cannot be secured.
[0012]
The object of the present invention is to provide a concrete block connecting method capable of solving such conventional problems at once, and to provide a fastening device used for connecting concrete blocks.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
That is, the concrete block connecting method according to the present invention is a concrete in which a plurality of concrete blocks in contact with each other are bundled together and bonded with a rod-like binding material that passes through a binding material insertion hole in the communication state of these concrete blocks. This is a block connection method. Then, one end side of the rod-like binding material is fixed to a concrete block at one end, and the screw shaft portion forming the other end side of the rod-like binding material is fixed at the hole end of the binding material insertion hole of the other end concrete block. A fixing nut for fixing is screwed onto the protruding screw shaft portion, and then a linear rod-shaped connecting bolt is connected to the screw shaft portion via a connecting nut. The connecting bolt is connected to the concrete block. The insertion hole portion provided in the support portion of the support base installed in the required portion is inserted into the support portion and protrudes outward from the support portion. A portion of the connecting bolt that protrudes from the support portion is a movable washer formed by superimposing a split washer having a projecting spherical surface and a split washer having a concave spherical surface on the projecting spherical surface and the concave spherical surface in a spherical contact state. The split washer that is loosely inserted into the through hole provided in the central portion and supported on the inside by the support portion is supported by the support portion. The spherical surface and the concave spherical surface are set to rotate relative to each other so that a required spherical contact state can be obtained. Thereafter, a friction reducing member is overlaid on the outer surface of the movable washer, and a tightening nut is screwed into an end portion of the connecting bolt that is inserted through the hole of the friction reducing member. By tightening while obtaining the action, after introducing prestress into the rod-like binding material via the connection bolt, the fixing nut is tightened, and then the connection bolt is separated from the rod-like binding material. It is what.
[0014]
In the connection method, it is preferable that the diameter of the connection bolt is set smaller than the diameter of the screw shaft portion.
[0015]
Further, the binding device used for connecting the concrete blocks according to the present invention is a binding device used for binding together a plurality of concrete blocks in contact with each other, and is a binding material in a communication state of the concrete blocks. A rod-like binding material that is inserted through the insertion hole and has one end fixed to the concrete block at one end and the screw shaft portion at the other end protruding from the hole end of the binding material insertion hole of the other end of the concrete block; A fixing nut for fixing screwed to the shaft portion, a straight rod-like connecting bolt connected to the screw shaft portion via a connecting nut, and a tension member that is installed at a required portion of the concrete block to tension the rod-like binding material And a support base for projecting a connection bolt inserted through an insertion hole provided in the support portion to the outside of the support portion, and the connection bolt The portion protruding from the support portion is formed by superposing a split washer having a projecting spherical surface and a split washer having a concave spherical surface on the projecting spherical surface and the concave spherical surface in a spherical contact state. A part protruding from the support part of the connecting bolt is inserted into the through-hole part, and the divided washer positioned inside is configured to be supported by the support part. In the state where the connecting bolt is loosely inserted, the movable washers configured such that the two split washers can be in a required spherical contact state by relatively rotating the projecting spherical surface and the concave spherical surface, A tightening nut screwed to an end portion of the connecting bolt, and a friction reducing member disposed between the movable washer and the tightening nut to reduce friction during tightening of the tightening nut. Is.
[0016]
In the tightening device, it is preferable that the diameter of the connecting bolt is set smaller than the diameter of the screw shaft portion.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A concrete block connecting method (hereinafter referred to as a connecting method) according to the present invention uses, as shown in FIG. 1, for example, a plurality of concrete blocks 1 as box culverts C using a binding device 2 as shown in FIG. , Introducing pre-stress and connecting. In the present embodiment, one or more, for example, one intermediate box culvert C3 is interposed between the box culvert C1 at one end and the box culvert C2 at the other end to be connected to contact each other. The three box culverts C1, C2, and C3 in the state are bound together.
[0018]
The box culvert C is used to construct a culvert, a common groove, and the like. As shown in FIGS. 1 and 3, the bottom plate 3, side plates 5 and 5 erected on the left and right, and a top plate 6 is formed in a box shape, and binding material insertion holes 7, 7, 7, 7 opened at both ends of the box culvert are provided at four corners thereof. In particular, the box culvert C1 at one end and the box culvert C2 at the other end are provided with box-shaped connecting recesses 9 in the middle of the four corners of the inner surface thereof, as shown in FIG. The binding material insertion hole 7 is opened at the inner end faces 10, 10.
[0019]
As shown in FIG. 2, the fastening device 2 includes a rod-like fastening material 13 as a PC steel rod 13 a having both end portions as screw shaft portions 11 and 12, and a nut 15 that is screwed into one screw shaft portion 11. A fixing nut 16 for fixing screwed to the other screw shaft portion 12, a straight rod-like connection bolt 19 connected to the screw shaft portion 12 via a connection nut 17, and the PC steel rod 13a. And a support washer 20, a movable washer 22 formed by overlapping a pair of split washers 18, 21, a friction reducing member 23, a rectangular plate-like support plate 25, and a washer 26. And a tightening nut 27.
[0020]
As shown in FIGS. 10 and 12, the PC steel bar 13a is inserted into the binding material insertion holes 7, 7, 7 in communication with the three laid box culverts C1, C2, C3, and The screw shaft portions 11 and 12 forming both end sides protrude into the connecting recesses 9 and 9 of the box culverts C1 and C2 located at both ends (the binding material insertion holes of the inner end face 10 of the connecting recess 9 are provided). The length is set to protrude at the hole end 29. The nut 15 is screwed onto the protruding screw shaft portion 11 with a support plate 8 and a washer 14, and the support plate 24 and a washer 28 are inserted into the protruding screw shaft portion 12. The fixing nut 16 is screwed.
[0021]
Further, as shown in FIGS. 4 to 6, the connecting bolt 19 is connected to the tip portion 30 of the screw shaft portion 12 via the connecting nut 17. The screw hole 31 of the connecting nut 17 is formed as a stepped screw hole. In the present embodiment, the inner screw hole portion 32 that can be screwed into the end portion 30, and the inner screw hole portion 32. And an outer screw hole portion 35 that has a small diameter and can be screwed into the inner end portion 33 of the connecting bolt 19.
[0022]
As shown in FIGS. 2 and 4 to 6, the support base 20 is provided on both sides of a support portion 37 in which insertion holes 36 for loosely inserting the connection bolts 19 are formed by notches, for example. The leg pieces 39 and 39 projecting toward the inner end face 10 of the recess 9 are bent, and the leg pieces 39 and 39 are brought into contact with the inner end face 10 with the support plate 24 interposed therebetween. . The lower ends of the leg pieces 39 are connected by a bottom piece 40.
[0023]
2, 4 to 6, and 8 to 9, the movable washer 22 includes an inner divided washer 18 having a concave spherical surface 41 and a protruding spherical surface 43 that can come into spherical contact with the concave spherical surface 41. A disc shape is formed by superposing the outer divided washer 21 provided, and a through hole portion 46 through which the connecting bolt 19 is loosely inserted is provided at the center portion thereof. In addition, in order to make the relative rotation of the concave spherical surface 41 and the protruding spherical surface 43 smooth, it is preferable to apply grease to the contact portion. The inner divided washer 18 is supported by the support portion 37, and both the divided washers 18 and 21 are recessed when the connecting bolt 19 is loosely inserted into the through hole portion 46. The spherical surface 41 and the protruding spherical surface 43 are configured to rotate relative to each other so that a required spherical contact state can be obtained.
[0024]
In addition, as shown in FIGS. 2 and 5 to 6, the friction reducing member 23 is configured as a thrust ball bearing 23 a in the present embodiment, and the connecting bolt 19 can be inserted into the hole 47 at the center. , The outer divided washer 21 is overlaid.
[0025]
As shown in FIGS. 4 to 6, the tightening nut 27 is a connecting portion protruding through the hole 47 of the thrust ball bearing 23a, the hole 50 of the support plate 25, and the hole 51 of the washer 26. The bolt is screwed to the portion 52 on the outer end side of the bolt.
[0026]
The following is a description of a connecting method in which the three box culverts C1, C2, and C3 that are in contact with each other using the binding device 2 having the above-described configuration are bound together.
[0027]
First, the box culverts C1 and C2 having the connecting recesses 9 are laid across the intermediate box culvert C3, and the blocks are brought into contact with each other with a water blocking material (not shown) interposed therebetween. Thereafter, as shown in FIGS. 10 to 12, the rod-like binding material 13 as the PC steel rod 13a is inserted into the binding material insertion holes 7, 7, 7 in a communicating state, and the screw shaft portions 11, 12 at both ends thereof are inserted. , And projecting from the hole end 29 on the inner end face 10 of the connecting recess 9.
[0028]
Thereafter, an ordinary nut 15 is screwed into one screw shaft 11 with the support plate 8 and a washer 14 interposed therebetween, thereby fixing one end of the PC steel bar 13a to the box culvert C1 at one end. And Further, the fixing nut 16 is temporarily screwed to the other screw shaft portion 12 via the support plate 24 and the washer 28, and the tip portion 30 of the screw shaft portion 12 is connected to the connection nut 17. While being screwed into the inner screw hole portion 32, the inner end portion 33 of the connecting bolt 19 is screwed into the outer screw hole portion 35 of the connecting nut 17. Thereafter, the support base 20 is opened with the insertion hole 36 opened upward, and the end portions 53 and 53 of the left and right leg pieces 39 and 39 are inserted into the recesses for connection with the support plate 24 in between. The contacted recess 9 is placed in contact with the inner end face 10.
[0029]
After that, a portion 55 of the connecting bolt 19 protruding from the support portion 37 is made to pass through the through hole portion 46 of the movable washer 22, the hole portion 47 of the friction reducing member 23 as the thrust ball bearing 23a, and the support plate. 25, and the hole 51 of the washer 26, and then the fastening nut 27 is screwed into the outer end portion 52 of the connecting bolt, and this is connected to a torque wrench (not shown). Tighten with a predetermined torque. For example, by interposing a load cell (not shown) between the support portion 37 and the movable washer 22, the tightening operation using a torque wrench or the like can be performed accurately while confirming the tightening load value.
[0030]
When the tightening nut 27 is tightened, the projecting spherical surface 43 and the concave spherical surface 41 are rotated relative to each other by the action of the tightening force, so that both split washers 18 and 21 have a stable required spherical surface. It becomes a contact state. FIG. 12 shows the axis of the PC steel rod 13a due to, for example, installation errors as shown in FIGS. 10 to 11 of the three box culverts C1, C2 and C3 (a step is generated or a displacement occurs during installation). Is in a state inclined with respect to the axis of the binding material insertion hole 7 provided in the box culvert, and the axis L of the connecting bolt 19 is not perpendicular to the outer surface 56 of the support portion 37, Inclined with respect to the outer surface 56. The outer surface 57 of the inner divided washer 18 is in surface contact with the outer surface 56 of the support portion 37, and the outer divided washer 21 performs the relative rotation according to the inclination of the axis of the connecting bolt 19. The two split washers 18, 21 are in a stable spherical contact state. The inner surface 59 of the thrust ball bearing 23a is in surface contact with the outer surface 60 of the outer divided washer 21, and the outer surface 61 of the thrust ball bearing 23a is tightened via the support plate 25 and the washer 26. The nut 27 is in a surface contact state.
[0031]
In this way, the inner and outer divided washers 18 and 21 rotate relative to each other according to the inclination of the axis of the connecting bolt 19 to maintain a stable spherical contact state. Therefore, it is possible to effectively use the tightening force of the tightening nut 27 for the tension of the PC steel bar 13a, and to easily and reliably introduce the required prestress. It can be carried out.
[0032]
If the movable washer 22 is omitted and the thrust ball bearing 23a is directly stacked on the support portion 37, the inclination of the axis of the connecting bolt 19 due to the inclination of the axis of the PC steel rod 13a is shown in FIG. As described above, the thrust ball bearing 23a is inclined, and this makes point contact 58 with the outer surface 56 of the support portion 37, so that the tightening force of the tightening nut 27 cannot be effectively converted into the tension force of the PC steel rod 13a. Therefore, there arises a problem that prestress introduction is incomplete. Further, the local pressure contact between the threaded portions of the tightening nut 27 and the connecting bolt 19 causes the threaded portions to be closely integrated with each other, leading to a situation in which the tightening nut cannot be tightened.
[0033]
In the present embodiment, since the connecting bolt 19 is connected to the PC steel bar 13a via the connecting nut 17, as long as necessary prestress can be introduced into the PC steel bar 13a, as described above, The connecting bolt 19 with the smallest possible diameter can be used, and therefore the fastening nut 27 with the smallest possible diameter can be used. By the way, the required torque for introducing pre-stress is smaller as the diameter of the tightening nut 27 is smaller. Therefore, the fact that the tightening nut having such a small diameter can be used reduces the tightening of the tightening nut by a torque wrench or the like. This produces an advantage that can be easily achieved with torque.
[0034]
Thus, after applying a required tension to the PC steel bar 13a via the connecting bolt 19, the other end of the PC steel bar is fixed by formally tightening the fixing nut 16. Then, as shown in FIG. 14, the connecting nut 17 is screwed forward to the tip end side of the connecting bolt to separate it from the PC steel rod 13a, and the connecting bolt 19 and the support base 20 are removed to introduce prestress. Completed the connecting construction of the box culvert.
[0035]
[Other Embodiments]
(1) When the concrete block is a box culvert, if the required tight space cannot be secured in the internal space, a relatively long connection bolt 19 is used and a connection bolt connected by a connection nut 17 as shown in FIG. 19, the outer end side portion 52 of the box culvert projects into the protruding state, and the support base 20 is installed in the same manner as described above, and the connecting bolt is inserted into the insertion hole portion 36 formed in the support portion 37. The portion 52 on the outer end side of 19 is inserted, and then the fastening nut 27 is screwed through the movable washer 22, the thrust ball bearing 23a, the support plate, and the washer having the same configuration as described above. Next, the tightening nut 27 is tightened as necessary with a torque wrench or the like, thereby applying a necessary tension to the PC steel bar 13a via the connecting bolt 19, and tightening the fixing nut 16 to tighten the PC steel bar 13a. The other end side is fixed, and then the connection nut 17 is separated from the PC steel bar 13a in the same manner as described above, and the connection bolt is removed and the support base 20 is removed, thereby the required connection of the concrete block. Is achieved.
[0036]
(2) When the movable washer 22 is constituted by spherical contact of a pair of divided washers 18 and 21 having the concave spherical surface 41 and the convex spherical surface 43, the inner divided washer has a convex spherical surface, contrary to the above. The outer divided washer may have a concave spherical surface.
[0037]
(3) In the case shown in FIG. 5, the friction reducing member 23 may be integrated with the outer divided washer 21.
[0038]
(4) The friction reducing member 23 is not only configured as the above-described thrust ball bearing, but also other bearings that can support a thrust load with a small rotational resistance, or a material that can reduce rotational frictional resistance (such as fluororesin). It can also be configured by a combination of a plurality of applied members.
[0039]
(5) The present invention may be configured such that the anchor plate 25 and the washer 26 are omitted in the embodiment, and the fastening nut 27 is brought into direct contact with the friction reducing member 23.
[0040]
(6) In the present invention, the diameter of the connecting bolt may be set to be substantially the same as the screw shaft portion of the rod-like binding material.
[0041]
(7) In the present invention, the concrete block is not limited to the box culvert, and may be various blocks that need to be connected by introducing prestress. The present invention may also be applied to the connection of two concrete blocks.
[0042]
(8) The insertion hole portion 36 provided in the support portion 37 may be configured as a closed hole portion such as a circular hole instead of the notch shape as described above.
[0043]
(9) The through hole 46 provided in the movable washer 22 is not necessarily a circular hole.
[0044]
【The invention's effect】
The present invention has the following excellent effects.
(1) According to the present invention, a stable spherical contact state is obtained by the relative pivoting operation of the movable washer, so the axis of the rod-like binding material is fixed due to the influence of the laying error of the concrete block, etc. Even if it is not perpendicular to the surface, the fastening nut can be stably tightened with a torque wrench or the like without being affected by this. This solves the problem of increased frictional resistance when tightening the tightening nut in the conventional connection method, and can effectively use the tightening force when tightening the tightening nut for the required tension of the rod-shaped binding material. The required prestress can be introduced easily and reliably.
[0045]
(2) In addition, the tightening nut can be stably tightened by the relative rotation of the movable washer performed while maintaining a stable spherical contact state. There is no possibility of causing a situation in which the screw nuts cannot be rotated due to the local pressure contact between the screw parts and the tightening nut cannot be rotated, as in the conventional connection method in which these are in a point contact state.
[0046]
(3) When the concrete block is a cylindrical block such as a box culvert, if the internal space is narrow and sufficient work space for rotating the tightening nut with a torque wrench cannot be secured, a long connection is required. The bolt is connected to the rod-like binding material via a connection nut, and the tightening nut is tightened using a support stand installed on the outer end surface of the box culvert, so that the tightening operation of the tightening nut can be easily performed And it can be performed reliably.
[0047]
(4) According to the present invention, the connecting bolt is connected to the rod-like binding material via the detachable connecting nut, instead of screwing the fastening nut to the rod-like fastening material as in the above-described conventional connection method. Since the pre-stress is introduced into the rod-like binding material by tightening the fastening nut screwed to the connection bolt, the connection bolt is made as thin as possible as long as the required pre-stress can be introduced by tightening the fastening nut. Can be configured. Therefore, according to this, a small-diameter tightening nut can be used (a small-diameter tightening nut can be adopted rather than a nut that is screwed to the screw shaft of the rod-shaped binding material). When tightening, the required tightening of the tightening nut can be easily and reliably performed with a smaller torque by the lever principle.
[0048]
(5) After the fixing nut is fixed, the friction reducing member does not intervene in the fixing part as in the above-mentioned conventional connection method. There is no problem that the introduction effect is reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which concrete blocks are connected to each other by applying a connecting method according to the present invention.
FIG. 2 is an exploded perspective view showing a binding device according to the present invention.
FIG. 3 is a perspective view showing an example of a concrete block.
FIG. 4 is a perspective view showing a usage state of the binding device.
FIG. 5 is a longitudinal sectional view thereof.
FIG. 6 is a sectional view seen from the plane.
FIG. 7 is a cross-sectional view thereof.
FIG. 8 is an exploded perspective view showing a movable washer.
FIG. 9 is a perspective view showing an outer divided washer.
FIG. 10 is a cross-sectional view illustrating a process of binding three box culverts together.
FIG. 11 is a cross-sectional view showing a laying error of a box culvert.
FIG. 12 is a cross-sectional view with intermediate omitted for explaining a process of connecting three box culverts using the binding device according to the present invention.
FIG. 13 is a cross-sectional view showing a problem when a movable washer is omitted.
FIG. 14 is a cross-sectional view showing a state where the connecting nut is separated from the PC steel rod.
FIG. 15 is a cross-sectional view showing another aspect of the block connecting method using the binding device according to the present invention.
FIG. 16 is a side view for explaining a conventional connecting method in which blocks are connected by introducing prestress.
FIG. 17 is a plan view showing the tight side.
FIG. 18 is a plan view for explaining the problems of the conventional block connecting method.
[Explanation of symbols]
1 Concrete block
2 Tightening device
7 Tightening material insertion hole
11 Screw shaft
12 Screw shaft
13 Bar-like binder
16 Fixing nut
17 Connecting nut
18 Split washer
20 Support stand
21 Split washer
22 Movable washer
23 Friction reducing member
27 Tightening nut
36 Insertion hole
37 Supporting part
41 concave spherical surface
43 Projecting spherical surface
46 Through hole

Claims (4)

A concrete block connection method in which a plurality of concrete blocks in contact with each other are bundled together and fastened with a rod-like binding material that passes through a binding material insertion hole in a communication state of these concrete blocks,
One end side of the rod-like binding material is fixed to the concrete block at one end, and the screw shaft portion forming the other end side of the rod-like binding material is projected at the hole end of the binding material insertion hole of the other end concrete block. A fixing nut for fixing is screwed onto the protruding screw shaft portion, and then a linear rod-like connecting bolt is connected to the screw shaft portion via a connecting nut, and the connecting bolt is required for the concrete block. It is inserted through the insertion hole provided in the support part of the support base installed in the part and protrudes outward of the support part,
The portion of the connecting bolt that protrudes from the support portion is the center of a movable washer formed by superposing a split washer having a projecting spherical surface and a split washer having a concave spherical surface on the projecting spherical surface and the concave spherical surface in a spherical contact state. The split washer is loosely inserted into the through-hole portion provided in the portion and is supported by the support portion, and the split washer is inserted into the through-hole portion and the split washer is inserted into the protruding spherical surface. And the concave spherical surface are relatively rotated so that a required spherical contact state can be obtained,
A friction reducing member is overlaid on the outer surface of the movable washer, and a tightening nut is screwed into an end portion of a connecting bolt that is inserted through a hole of the friction reducing member, whereby the tightening nut serves to reduce the friction of the friction reducing member. It is characterized in that by pre-stressing the rod-like binding material via the connection bolt, the fixing nut is tightened by tightening while obtaining, and then the connection bolt is separated from the rod-like binding material. Concrete block connection method. 2. The method for connecting concrete blocks according to claim 1, wherein a diameter of the connecting bolt is set smaller than a diameter of the screw shaft portion. A binding device used for binding together a plurality of concrete blocks in contact with each other,
The binding material insertion hole in the communication state of the concrete block is inserted, and one end side is fixed to the concrete block on one end, and the screw shaft portion on the other end side is the hole end of the binding material insertion hole on the other end concrete block. And a fixing nut for fixing screwed to the screw shaft portion, a straight rod-like connecting bolt connected to the screw shaft portion via a connecting nut, and a required portion of the concrete block. A support base that is installed and used to tension the rod-like binding material, and projects a connection bolt inserted through an insertion hole provided in the support portion to the outside of the support portion; and the support of the connection bolt The projecting part is a split washer having a projecting spherical surface and a split washer having a concave spherical surface, and the projecting spherical surface and the concave spherical surface are overlapped in a spherical contact state, and is provided at the central part thereof. A portion of the connecting bolt protruding from the support portion is loosely inserted into the formed through-hole portion, and an inner divided washer is supported by the support portion. A movable washer configured so that the projecting spherical surface and the concave spherical surface can rotate relative to each other and the required spherical contact state can be obtained when the connecting bolt is loosely inserted into a portion. A tightening nut screwed into an end portion of the connecting bolt, and a friction reducing member disposed between the movable washer and the tightening nut to reduce friction during tightening of the tightening nut. Tightening device used for connecting concrete blocks. The fastening device used for connecting concrete blocks according to claim 3, wherein a diameter of the connecting bolt is set smaller than a diameter of the screw shaft portion.

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