JP3030369B2 - Concrete member connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to concrete for constructing a sewer, a general waterway, a culvert, a common ditch, etc. by connecting a plurality of concrete members such as box culverts back and forth (in a vertical direction) with PC steel rods. The present invention relates to a member connecting structure.

[0002]

2. Description of the Related Art Sewers, general waterways, culverts, common ditches, etc.
It is constructed by transporting a reinforced concrete cylindrical box culvert manufactured in a factory to a predetermined place and arranging a plurality of box culverts having a length of about 1 to 2 m in a vertical direction. These box culverts are connected via a PC steel material in order to prevent water leakage from the joint surface (end surface), and are integrated by the tension of the PC steel material.

In the conventional box culvert connection structure, as shown in FIG. 7, a plurality of concrete fixing blocks 1, 1,..., Intermediate blocks 11, 11,.
Are arranged between the fixing blocks 1 _B and 1 _C , and are arranged in front and rear (vertically). In FIG. 8, connecting through-holes are formed in the haunch portions at the four corners so as to be aligned with each other in the front-rear direction. Further, as shown in FIGS. 4
Is provided in such a manner that the central portion (front-back direction) of the connecting through-hole 3 is widened and opened to the inner peripheral surface side.

Then, a fixing block 1 and an intermediate block 1
1, a PC steel rod 51 is inserted through the connecting through hole, and a PC steel rod 51 _C inserted through the front of the fixing notch hole 4 of the fixing block 1 as shown in FIG. and the rear end portion and the rear of the insertion is a PC steel rod 51 _D toward the front end and is projected, the end portion of the front and rear of the PC steel bars 51 _C, 51 _D,
The fixing is performed via a fixing nut 53 screwed to each end, a fixing nut 53, and a fixing plate (anchor plate) 59 in contact with the washer 55.

Namely, PC steel bar 51 _C, as shown in FIG. 7, the front end portion is protruded to the front side of the fixing block 1 fixing notch hole 4 of the _B, fixing block 1 in a rear portion rearward is projected to _C fixing notch hole 4, the fixing nut 5 to the front and rear ends to the front and rear fixing block 1 _B, 1 _C each fixing notch hole 4
3. The fixing is performed via a washer 55 and a fixing plate 59. Further, a tension is applied to the PC steel rod 51,
The plurality of fixing blocks 1, 1,..., The intermediate blocks 11, 11,.

The tension applied to the PC steel rod 51 is as follows.
As shown in FIG. 10, the center hole jack 61 is fixed to the rear end face side of the fixing block 1 on the rear side of the PC steel rod 51, and the tension bar 62 is inserted into the connection through hole 3.
The front end of the tension bar 62 is projected into the fixing notch hole 4 on the rear side, and is joined to the rear end of the PC steel rod 51 via a coupler 57 screwed to both ends. While the steel bar 51 is pulled backward and tensioned, the fixing nut 53 at the rear end of the PC steel bar 51 is used.
This is done by tightening.

[0007]

Since the fixing notch 4 of the fixing block 1 is provided on the inner peripheral side of the fixing block 1 as shown in FIG. The fixing work of the PC steel rod 51 such as the screwing of the fixing nut 53 and the coupler 57 to the end portion and the tightening of the fixing nut 53 can be performed relatively easily by a worker entering the inner peripheral side of the fixing block 1. Can be. On the other hand, after fixing the end of the PC steel rod 51, it is necessary to fill the fixing notch 4 with mortar or the like, and the appearance of the mortar portion and the concrete portion deteriorates because the colors of the mortar portion and the concrete portion are different. There was such a problem.

Further, the fixing plate 59 for transmitting the tension of the PC steel rod 51 to the fixing block 1 needs to have a certain area of the bearing surface, and conventionally, the opening width of the fixing notch hole 4 is increased. Since the fixing plate 59 is accommodated therein, the large fixing notch 4 becomes an obstacle and the long reinforcing bar 6
It is difficult to arrange reinforcing bars in the concrete portion, and the greater the number of fixing notch holes 4, the lower the strength of the entire fixing block 1, and there is a problem that a large number of reinforcing steel bars are required. Furthermore, the concrete portion around the fixing notch hole 4 has a problem that a crack is easily generated because a tensile force acts in the front-rear direction.

The present invention has been made in view of such conventional problems,
An object of the present invention is to provide a concrete member connecting structure in which a fixing notch hole of a fixing block is suitably closed, a fixing operation of a PC steel rod is easy, and an opening width of the fixing notch hole is formed small. It was done.

[0010]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A plurality of fixing blocks and intermediate blocks made of concrete are arranged in front and rear, and each of the fixing blocks and each of the intermediate blocks are provided with connecting through holes aligned in front and rear with each other. A notch hole for fixing is formed by widening the connecting through hole, a PC steel rod is inserted into the connecting through hole of the fixing block and the intermediate block, and an end of the PC steel rod is fixed to the fixing hole. The block is protruded into the fixing notch hole of the block, is fixed to the fixing notch hole via a fixing nut screwed into an end of the PC steel rod and a fixing plate to which the fixing nut is fixed, and the P is fixed.
In the connecting structure of a concrete member in which the fixing block and the intermediate block are connected to each other by a C steel bar, the fixing notch hole is formed by opening to a rear end surface side of the fixing block, and the fixing notch hole is formed. A centering member having a tapered guide hole expanded rearward is mounted on the opening side of the PC steel rod, and a rear end portion of the PC steel rod in front of the fixing notch hole is provided in the fixing notch hole. Is fixed via the fixing nut and the fixing plate, and a front end portion of the PC steel bar behind the fixing notch hole is inserted into the guide hole of the centering member, so that the fixing notch hole is formed. At the rear end of the PC steel rod on the front side of the steel rod via a coupler screwed to both.

The opening width of the fixing notch hole of the fixing block is formed to be smaller than the bearing surface width of the fixing plate, and the fixing plate has a peripheral edge portion embedded in a concrete portion. It is preferable to be fixed to the inner part of the body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
Referring to FIG.

In the figure, 11 and 21 are box culverts (concrete members), 11 is an intermediate block, and 21 is a fixing block. 31 is a centering member, 41 is a fixing plate, 51 is a PC steel bar, 53 is a fixing nut, 55 is a washer, 57 is a coupler, 61 is a center hole jack, 63 is a tension stand, and 66 is a wrench.

The intermediate block 11 and the fixing block 21 are formed in a rectangular cylindrical shape, and the front end face and the rear end face of the intermediate block 11 and the fixing block 21 are formed into a convex shape and a concave shape which are fitted to each other, and the rear end face is formed. Is provided with an annular packing material. Then, as shown in FIG. 1, a plurality of intermediate blocks 11, 11 ..., the fixing blocks 21, 21 ... is, interleave a plurality of intermediate blocks 11, 11 ... between two fixing blocks 21 _B, 21 _C In the arrangement, they are arranged in front and rear (vertically).

The intermediate blocks 11 and the fixing blocks 21 are provided with connecting through holes 13 and 23 (diameters 32 to 3).
5 mm) are formed in the haunch portions at the four corners so as to be aligned with each other back and forth.
As shown in FIGS. 2 and 3, the fixing notch 24 is provided so as to widen the rear end portion of the connection through hole 23 and open the rear end surface side. Therefore, the fixing notch holes 24 provided on the rear end face of the fixing block 21 are closed when the intermediate block 11 is installed behind the fixing block 21, so that there is no need to pack mortar or the like. I have.

Further, the fixing notch hole 2 of the fixing block 21 is provided.
The centering member 31 is fitted to the opening end of the fourth member 4 such that the centering member 31 is fitted to a concave portion formed on the periphery of the opening end. The centering member 31 is made of a steel plate (thickness 0.6 to
0.8 mm), as shown in FIGS. 3 and 4, it is formed in a substantially disk shape having a guide hole 33 in the center portion.
The guide hole 33 is formed in a tapered shape expanding rearward,
The periphery of the guide hole 33 can be elastically deformed by a plurality of slits 34, 34,..., And has a structure capable of suitably guiding the front end of the PC steel rod 51.

Further, the fixing notch 2 of the fixing block 21 is provided.
As shown in FIG. 3, a fixing plate (anchor plate) 41 is fixed to the back of the fixing member 4 in such a manner that the peripheral portion is embedded in a concrete portion. The opening width of the fixing notch hole 24 is formed relatively small while securing the area, thereby preventing the fixing notch hole 24 from obstructing the reinforcement of the concrete portion. The opening width of the fixing notch hole 24 is, as shown in FIG.
It is sufficient that the main body 67 of the wrench 66 for tightening the fixing nut 53 can be inserted and rotated.

As shown in FIG. 3, a grout injection hole 44 is formed in the fixing plate 41 so that the PC steel rod insertion hole 4 at the center from the outer peripheral side.
3, a grout injection hole 25 is provided in the concrete portion of the fixing block 21 so as to communicate with the grout injection hole 44 of the fixing plate 41 from the inner peripheral surface side. Thereby, a worker can enter the inner peripheral side of the fixing block 21 and perform an operation of injecting the grout material into the connection through holes 23, 13, 13,....

A PC steel rod 51 (having a diameter of 17 to 21 mm) is inserted into the connecting through holes 13 and 23 of the intermediate block 11 and the fixing block 21.
The first fixing notch hole 24, as shown in FIG. 3, the rear end portion of the rear end portion of the insertion on the front side is a PC steel rod 51 _C is protruded, the front-side PC steel bars 51 _C Is fixed to the fixing notch 24 via the fixing nut 53 screwed to the rear end, the fixing nut 53, and the fixing plate 41 in contact with the washer 55. Further, the fixing notch hole 2 of the fixing block 21 is provided.
The 4, the front end portion of the inserted through a PC steel rod 51 _D to the rear side, protrudes through the guide hole 33 of Shinde member 31, the front end of the rear side PC steel bars 51 _D is forward PC on the side
The rear end portion of the steel bar 51 _C, coupler 57 screwed to both
Are joined through.

That is, as shown in FIG. 1, the PC steel rod 51 _C has a front end protruding into the fixing notch 24 of the front fixing block 21 _B and a rear end protruding from the rear fixing block 2.
It is projected to 1 _C fixing notch hole 24 of the joined front end portion via the coupler 57 to the rear end of another PC steel bar 51 _B of the front side, fixing of the rear end the rear side block 21 _C is fixed in the fixing notch hole 24 of _C through a fixing nut 53, a washer 55, and a fixing plate 41. In addition, PC steel rod 51
Are tensioned, and a plurality of intermediate blocks 11, 11 are provided by such a plurality of PC steel rods 51, 51.
The fixing blocks 21, 21 are connected and integrated.

As described above, the plurality of intermediate blocks 11, 11
..., upon coupling fixing blocks 21, 21 ... the back and forth, as shown in FIG. 3, the PC already fixed on the fixing notch hole 24 of the fixing blocks 21 _C of the last coupled
The coupler 57 is screwed to the rear end of the steel rod 51 _C, keep mounted Shinde member 31 to the open end of the fixing notch hole 24.
Thereafter, as shown in FIG. 1, the rear of the fixing block 21 _C, which is connected to the end, a new plurality of intermediate blocks 1
1,11 ... placed in alignment with the, behind the intermediate block 11 installed in the end, it is placed in alignment a new fixing block 21 _D. The fixing notch hole 24 of the rear end surface of the fixing block 21 _C, the intermediate block 1 installed in the rear
1, the mortar or the like does not need to be packed in the fixing notch 24.

Next, the fixing block 2 installed at the rear end
1 push insert the PC steel bars 51 _D each fixing notch hole 24 of the _D forward, the front end of the PC steel bars 51 _D in the fixing notch hole 24 of the fixing blocks 21 _C of the coupled anterior The rear end of the unfixed fixing block 21 _D
, The fixing blocks 21 are newly installed so as to protrude through the fixing notch holes 24 of the fixing block 21.
_D connecting through holes 13, 13 ..., PC steel rod 51 to 23 _D
Through.

[0023] Then, as shown in FIG. 3, the front end portion of the PC steel bars 51 _D of the newly inserted rearward, the coupler 57 in the fixing notch hole 24 of the fixing blocks 21 _C of already connected on the front side so as to fit threadedly joined to the rear end portion of the fixing already the PC steel bars 51 _C of the front side. At this time, the connecting through hole 2
3, 13, 13 ... are PC steel materials 51 for grouting material injection
And the fixing block 2 on the front side
Although the fixing notch 24 of 1 _C is closed by the intermediate block 11 installed at the rear, the PC steel rod 51 on the rear side is closed.
The front end of _D is a tapered guide hole 33 of the centering member 31.
I'll be inserted into, it is possible to align the rear end portion of the easily front side of the PC steel bars 51 _C by simply moving forward, both through the coupler 57 to a closed fixing notch hole within 24 And can be suitably joined.

Further, as shown in FIG. 5, it is screwed fixing nut 53, a coupler 57 to a rear end portion of the PC steel bars 51 _D newly inserted. Then, the fixing block 21 _D on the rear side
A center hole jack 61 is fixed to the rear end face side via a tension stand 63, and the tip of the tension bar 62 is inserted into the fixing notch hole 24, and the PC steel rod 51 is inserted.
_{D is connected to} the rear end of the PC steel rod 51 via a coupler 57 which is screwed to both ends.
_While pulling _D backward and being tensed, PC steel rod 51
The fixing nut 53 at the rear end of _D is tightened with a wrench 66 to fix.

The wrench 66 has a long body
And a handle 69 projecting laterally, and a fitting hole 68 is formed in the main body 67 so as to penetrate forward and backward. Accordingly, the wrench 66 inserts the tension bar 62 into the fitting hole 68 of the main body 67, inserts the tip of the main body 66 into the fixing notch 24, and inserts the fixing nut 5 into the fitting hole 68 of the main body 67.
3. The fixing nut 53 and the coupler 57 screwed to the rear end of the PC steel rod 51 pulled rearward so that the coupler 57 is fitted therein can be suitably rotated. Also, the tension stand 63
Is formed into a cylindrical shape having a through hole 64 for fastening penetrating in the front and rear direction, and an operation window hole 65 is opened to communicate laterally,
The main body 67 of the wrench 66 is rotatably accommodated in the fastening through hole 64, and the handle 69 projects outward from the operation window hole 65.

Thus, the newly installed intermediate blocks 11, 11,..., Fixing block 21 are made of PC steel rods 51, 51.
... are connected and integrated by these intermediate blocks 1
The intermediate blocks 11, 11,..., And the fixing block 21 are further installed and connected behind the fixing blocks 21, 11,.

[0027] Incidentally, the head of the fixing block 21 _A, as shown in FIG. 6, the fixing notch hole 124 is provided in a form to be opened to the front face side and widened the front end portion of the connecting through-holes 23 The fixing notch hole 24 on the rear end face side is not provided. Further, a fixing plate 141 is fixed to a deep portion of the fixing notch hole 124 such that a peripheral portion is embedded in a concrete portion. Then, the first fixing block 21 _A
The PC inserted through the rear of the notch hole 24 for fixing
The front end of the steel bar 51 _B has projecting, fixing the front end portion of the PC steel rod 51 _B is, fixing nut 53 and the fixing nut 53 which is screwed to the front end, through the fixing plate 141 in contact with the washer 55 Have been.

[0028] That is, the head of the PC steel bar 51 _B, as shown in FIG. 1, the front end portion protruding forward of the fixing block 21 _A fixing notch hole 124 of the fixing block of the rear portion rearward 21 is projected to the fixing notch hole 24 of the _B, and front and rear end portions before and after the fixing blocks 21 _a, 21 fixing nut 53 to the fixing notch hole 124,24 of _B, the washer 55, through the fixing plate 141 Has been established.

Although the above embodiment shows a case where the concrete member is a box culvert, the concrete member may be a perforated pipe block for laying cables such as telephone lines and electric wires underground.

[0030]

As described above, the connecting structure for concrete members according to the present invention has a fixing notch hole of a fixing block opened to the rear end face side, and the fixing steel notch hole has a front side PC steel. By fixing the rear end of the rod via a fixing nut and a fixing plate, and joining the front end of the rear PC steel to the rear end of the front PC steel via a coupler, a plurality of fixing blocks and In the form of closing the intermediate block, the fixing notch hole of the fixing block with the rear intermediate block,
Since the connection can be made, there is no need to fill the fixing notch with mortar or the like, and it is possible to avoid a tensile force acting on the concrete portion around the fixing notch. By mounting the centering member having the tapered guide hole on the opening side of the fixing notch hole, the front end portion can be moved forward only by moving the rear PC steel bar forward.
It can be easily aligned with the rear end of the C steel bar, and can be suitably joined to each other via a coupler in a closed fixing notch.

Further, the peripheral width of the fixing plate is buried in the concrete portion to reduce the opening width of the fixing notch hole, so that the fixing notch hole does not hinder the arrangement of reinforcing bars in the concrete portion, and the strength of the fixing block. Can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a concrete member connection structure according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB in FIGS. 1 and 2;

FIG. 4 is a sectional view taken along line CC of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line DD of FIG. 1;

FIG. 6 is an enlarged sectional view taken along line EE in FIG. 1;

FIG. 7 is a plan view showing an example of a conventional connection structure for concrete members.

FIG. 8 is an enlarged sectional view taken along line XX of FIG. 7;

FIG. 9 is an enlarged sectional view taken along line YY of FIGS. 7 and 8;

FIG. 10 is an enlarged sectional view taken along the line ZZ in FIG. 7;

[Description of Signs] 11 Intermediate Block (Box Culvert) 13 Connection Through Hole 21 Fixing Block (Box Culvert) 23 Connection Through Hole 24 Fixing Notch Hole 25 Grout Injection Hole 31 Centering Member 33 Guide Hole 34 Slit 41 Fixing Plate (Anchor plate) 43 PC steel rod insertion hole 44 Grout injection hole 51 PC steel rod 53 Fixing nut 55 Washer 57 Coupler 61 Center hole jack 62 Tension bar 63 Tension stand 64 Fastening through hole 65 Operation window hole 66 Wrench 67 Main body 68 Fitting hole 69 Handle 124 Notch hole for fixing 141 Fixing plate (anchor plate)

Claims (2)

(57) [Claims] 1. A plurality of fixing blocks and intermediate blocks made of concrete are arranged in front and rear, and each fixing block and each intermediate block are provided with connecting through holes aligned in front and rear with each other, The fixing block is provided with a fixing notch hole in which the connection through hole is widened, and a PC steel rod is inserted into the connection through hole of the fixing block and the intermediate block to form an end of the PC steel rod. The fixing portion protrudes into the fixing notch hole of the fixing block, and is fixed to the fixing notch hole via a fixing nut screwed into an end of the PC steel rod and a fixing plate to which the fixing nut is fixed. In the concrete member connecting structure in which the fixing block and the intermediate block are connected back and forth by the PC steel rod, the fixing notch hole is opened on the rear end surface side of the fixing block. A centering member having a tapered guide hole that opens rearward is mounted on the opening side of the fixing notch hole, and the fixing notch hole is provided in front of the fixing notch hole. The rear end of the PC steel rod on the side is fixed via the fixing nut and the fixing plate, and the front end of the PC steel rod on the rear side of the fixing notch hole is connected to the guide hole of the centering member. And a rear end portion of the PC steel bar at a front side of the fixing notch hole and joined to the rear end portion of the PC steel bar via a coupler screwed to both. 2. An opening width of a fixing notch hole of a fixing block is formed to be smaller than a bearing surface width of a fixing plate, and the fixing plate has a peripheral edge portion embedded in a concrete portion. The connection structure for a concrete member according to claim 1, wherein the connection structure is fixed to a rear portion of the concrete member.