KR20080088401A - Precast concrete box culvert - Google Patents

Abstract

A pre-cast concrete box culvert is provided to bury a pipe in a culvert having a through hole so that the culvert is directly used without the subsequent process. A pre-cast concrete box culvert includes an end point mounting unit(10) and a starting point mounting unit(20). The end point mounting unit is integrated with the starting point mounting unit. A steel line is inserted into the starting point mounting unit and then the steel line extends from the end point mounting unit to be cut. The end point mounting unit includes a wedge cone(2) having an end point wedge hole(17) and an end wedge(11) provided in the end point wedge hole.

Description

Prefab Concrete Culvert Prefab

The present invention relates to a prefabricated precast concrete culvert embedded with a pipe forming a steel wire insertion hole in the culvert.

BACKGROUND ART Conventionally, those known in Patent Documents 1 and 2 have been proposed as bidirectional steel wire mounting apparatus for assembled PC culverts.

Bidirectional steel wire fixing apparatus of Patent Document 1 (Korean Patent Laid-Open Publication No. 2003-0040874), as shown in Figure 6 and 7, the hollow coupling member 101; A pair of wedge cone members 102 and 102 'detachably coupled to both ends of the coupling member 101 and having a cone shaped wedge hole 104 and 104' formed at the center thereof; And wedges 103 and 103 which are inserted into the wedge holes 104 and 104 'of the wedge-con members 102 and 102' by biting the end portions of the steel wires 10 and 10 'to fix the steel wires 10 and 10'. '), The steel wire (10, 10') is characterized in that connected to each other by the coupling member 101 while being fixed in both directions.

In the method of assembling the prefabricated PC culvert using this apparatus, as shown in FIG. 8, the prestress force is applied by the steel wires 11 and 11 'inserted into the steel through holes 112 and 112' to be fixed at the joint section. Fixing one end of the steel wire 11 to one side of the viewpoint culvert of the prefabricated PC culverts 201, 202, and 203 sequentially installed in a number desired to be tensioned; Inserting the steel wire (11) into the steel wire through hole (112) of the sequentially installed prefabricated PC culvert (201, 202, 203) to expose to the outside of the other prefabricated PC culvert (203); Installing the bidirectional steel wire fixing device (100) in the concave portion (110) formed on the joint surface of the assembled PC culvert (203) of the exposed steel wire (11); Fixing the tensioned steel wires 11 and cutting the fixed steel wires 11 by using one side of the wedge-con member 102 and the wedge 103 of the bidirectional steel wire fixing device 100; Coupling one wedge-con member 102, the coupling member 101, and the other wedge-con member 102 ′ on which the steel wire 11 is fixed; Subsequently installing the number of prefabricated PC culverts 204, 205 and 206 to be assembled; Inserting a new steel wire 11 'into the steel wire through hole 112' through the open joint section of the subsequent prefabricated PC culvert 204, 205, 206; The newly inserted steel wire 11 ′ is inserted into the other wedge-con member 102 ′ of the bidirectional steel wire fixing device 100 installed at the end surface of the junction of the PC culvert 203 assembled by prestressing force and inserted therein. Biting the wedge (103 ') which was located at; The end portion of the freely exposed steel wire 11 'is tensioned so that the steel wire 11' held by the wedge 103 'in the other wedge cone member 102' is pulled to the other wedge cone member 102 '. By being fixed, the prefabricated PC culverts 201, 202, 203, 204, 205 and 206 are integrally assembled.

However, since the fixing fixtures 102 and 103 of the end point and the fixing fixtures 102 'and 103' of the starting point are arranged in a straight line by the coupling part material 101, after installing and tensioning the fixing means 102 and 103 of the end point, the steel wire ( 11) Cut off. Then, the screw is fastened to one end of the coupling member 101, and the fasteners 102 'and 103' of the starting point are screwed to the other end of the coupling member 101, and then the steel wire 11 'is connected to the end point. There are many assembly processes such as fixing to tension-tighten the fixing holes 102 and 103, which can significantly reduce workability.

Moreover, since it connects in a straight line, the structure of the coupling member 101 is further needed. In addition, additional machining of the threaded portion is required in addition to the coupling member 101. As a result, a lot of costs and time are required to manufacture the fixing apparatus, which inevitably leads to a decrease in productivity and economic efficiency.

On the other hand, PC culvert using the bidirectional steel wire fixing device of Patent Document 2 (Korean Patent Publication No. 10-0692913) to overcome this is as shown in Figs.

First, the steel wire 950 is inserted through the wire passing hole 870 formed in the first culvert 810, the second culvert 820, and the third culvert 830. One end of the steel wire 950 discharged into the recess 815 of the first culvert 810 is inserted into the housing 500 in which the first wedge hole 540 is formed, and the first wedge hole 540. It is bitten by the first wedge 610 disposed in the.

The other end of the steel wire 950 penetrates through the steel wire passing hole 870 of the second culvert 820 and is discharged into the recess 835 of the third culvert 830, which is the wedge cone member ( It is inserted into the second wedge hole 740 formed in the 700 to be bitten by the second wedge 620.

Pulling the other end of the steel wire 950 inserted into the housing 500 by using the hydraulic tension device 900, the first wedge 610 that is biting one end of the steel wire 950 is the first wedge hole While strongly inserted into the 540, one end of the steel wire 950 is strongly held, thereby preventing the steel wire 950 from slipping out.

When the other end of the steel wire 950 pulls the steel wire 950 using the hydraulic tension device 900, the hydraulic tension device 900 causes the second wedge 620 to extend the second wedge hole ( 740, the support portion 720 of the wedge cone member 700 is in close contact with the concave portion of the third culvert 830 and the second wedge 620 is connected to the second wedge hole 740. Strongly in contact with the other end of the steel wire 950 more strongly. At this time, since the diameter of the support part 720 is large, the force is dispersed when the force is applied to the concave part 835 of the third culvert 830 and the concave part 835 of the third culvert 830 is broken. Can be minimized.

As described above, when the steel wire 950 is completely fixed to the steel wire fixing device, the other end of the steel wire 950 is cut, the spring 630 is inserted into the housing 500 and another first wedge 610 is The inserted housing 500 is coupled to the wedge-con member 700.

Coupling method is inserted into the engaging hole (527) formed in the engaging jaw 520 of the housing 500, the locking projection 715 formed on the wedge cone member 700, and then rotated by the wedge cone member 700 The engaging projection 715 is to be coupled to the hanging jaw (520).

Thereafter, one end of the housing 500 having the first wedge hole 540 formed therein penetrates the steel wire passing hole 870 of the fourth culvert 840, the fifth culvert 850, and the sixth culvert 860. Insert the steel wire 950.

Of course, after the steel wire 950 is inserted into one end of the housing 500, the housing 500 may be coupled to the wedge-con member 700.

The fourth culvert 840 is arranged in a third culvert such that the steel wire fixing device of the present invention is disposed between the recess 845 of the fourth culvert 840 and the recess 835 of the third culvert 830. After arranging to be in contact with 830, the culverts are brought into close contact with the recess 865 of the sixth culvert 860 using a wedge-con member 700 into which another second wedge 620 is inserted.

By the way, since the steel wire fixing device of this patent document 2 is also arrange | positioned in series with a starting point and an end point, it cuts after tension-fixing an end steel wire to an end mounting hole (the left side of the bidirectional fixing device provided in the culvert center of FIG. 6), It is similar to Patent Document 1 that an assembly process is very complicated, such as fastening a steel wire after fixing a steel wire at the point of time (the right side) to fix the steel wire at the end.

The present invention has been made in order to solve the above-described problems, the object of the present invention is to provide a prefabricated concrete culvert prefabricated that can be used immediately without a separate post-process is embedded in the pipe forming the insertion hole in the culvert.

Prefabricated PC culvert of the present invention for achieving the above object is a culvert; A wedge hole is formed, the cross section of which is gradually reduced, the wedge cone having an enlarged portion of the wedge hole exposed to the outside of the culvert; It is composed of a pipe which is installed in the reduced portion of the wedge hole to form a steel wire insertion through hole,

The pipe is embedded in the culvert, and the wedge cone is embedded in the culvert with the enlarged portion of the wedge hole exposed to the outside.

In the above-described configuration, the pipe forming the steel wire insertion hole is embedded in the culvert, so that it can be used immediately without a separate post process.

As is apparent from the above description, the present invention has the following effects.

First, since the starting and end fittings are formed in parallel to each other, the steel wires can be pushed in and tensioned without disassembly and assembly. Therefore, the construction is simple and quick, and the construction properties are significantly improved. In addition, since the starting stopper and the end stop are arranged in parallel in one wedge cone, the depth of the receiving groove may be shallower than that of the conventional receiving groove, and culvert molding is easy.

Second, the pipe forming the wire insertion hole communicating with the end stop, and the finishing material for closing the enlarged portion of the time wedge hole is further inserted into the formwork, it can be used immediately without a separate post-process.

Third, the first pipe forming the steel wire insertion through hole communicating with the end stop and the second pipe forming the steel wire inserting through hole communicating with the starting point stop are further inserted into the formwork, so that a plurality of steel wires are provided without a separate post process. An insertion through hole is formed and can be used regardless of the order of the culvert body.

Fourth, the elastic member for applying the elastic force toward the narrowing portion of the wedge hole is installed, the wedge is pushed backward by the steel wire, so that the wedge is pushed backward by the steel wire when the steel wire is inserted into the wedge, so that the steel wire cannot be accurately caught. To prevent wedges and continue to wedge the wedges.

Hereinafter, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in the present embodiment, when using the steel wire fixing device in which the wedge, the elastic member and the stopper are assembled, the opposite ends (initiation point and end point) of the steel wire are inserted into the wedge in the opposite direction to the wedge action (at the reduced portion of the wedge hole). Inserted into the enlarged part) and then fixed in the wedge action direction.

On the contrary, in the case of using the steel wire mounting apparatus in which the wedge, the elastic member and the stopper are not assembled, the wedge may be pushed into the wedge hole by using a hammer or the like after the steel wire is inserted.

1 is an exploded perspective view illustrating a two-stage integrated bidirectional steel wire fixing device according to a preferred embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1.

As shown in Fig. 1 and Fig. 2, the steel wire fixing device 1 of the present embodiment is largely composed of an end point fixing opening 10 and a view point fixing opening 20. In addition, the end stopper 10 and the start stopper 20 are integrally arranged in parallel.

In this way, since the end stopper 10 and the start stopper 20 are arranged in parallel, after the other wire is bitten by the start stopper 20, the end wire 10 is tensioned and fixed in the end stop 10 so as to be cut. The single person settling process simply ends.

The end anchoring port 10 is a configuration for fixing the steel wire of the point to be bitten by the hydraulic tensioner (50). The end fitting fixture 10 is composed of a wedge cone 2 having an end wedge hole 17 which gradually expands, and an end wedge 11 disposed in the end wedge hole 17.

The end wedge 11 preferably has an outer circumferential surface of a conical shape and an inner circumferential surface of a cylindrical shape. In addition, the end wedge 11 may comprise a plurality of individual wedge pieces, or may comprise a split wedge piece (in this embodiment) provided with a cutout groove.

When the tensioned steel wire is released in the state caught in the terminal wedge 11, the steel wire to be contracted pulls the terminal wedge 11 into the wedge hole 17 of the contraction portion. Therefore, the end wedge 11 is wedge action to the steel wire by the reduced portion of the end wedge hole 17 to fix the steel wire.

The viewpoint anchoring hole 20 is a fixing device for first grabbing the steel wire. This viewpoint anchoring opening 20 is comprised from the wedge cone 2 which has the viewpoint wedge hole 27 gradually reduced in contrast with the terminal anchorage opening 10, and the viewpoint wedge 21 arrange | positioned in this wedge hole 27. As shown in FIG. .

When the tensile force of the steel wire is released in the state caught in the viewpoint wedge 21, the steel wire to be contracted pulls the viewpoint wedge 21 into the wedge hole 27 of the contraction portion. Therefore, the viewpoint wedge 21 is fixed to the steel wire by wedge action against the steel wire by the reduction portion of the viewpoint wedge hole 27.

That is, the steel wire is settled by giving a wedge action to the starting point wedge 21 and the end wedge 11 by the force to pull each other.

The wedge cone 2 is preferably configured as one body in which the terminal wedge hole 17 and the viewpoint wedge hole 27 are arranged in parallel.

Moreover, it is preferable that the groove 3 is formed in the outer peripheral surface of the wedge cone 2. When the groove 3 is inserted with an insert, the contact area with the concrete can be widened to increase the bonding strength, which is good for preventing the separation. The groove 3 is preferably formed at the boundary of the end wedge hole 17 and the start point wedge hole 27 (a portion where the thickness of the flesh is large).

In addition, it is preferable that the end member wedge hole 17 and the viewpoint wedge hole 27 are provided with elastic members 13 and 23. Since the elastic members 13 and 23 add elastic force in the direction of wedging the wedges 11 and 21, not only the wedges 11 and 21 are prevented from being pushed out by the steel wire inserted opposite to the elastic direction. In addition, the fixing force can be further increased because the elastic force is continuously applied in the wedge action direction.

The inner surfaces of the wedge holes 17 and 27 on which the elastic members 13 and 23 are installed may have a cylindrical shape.

In addition, it is preferable that hollow stoppers 15 and 25 for preventing separation of the elastic members 13 and 23 are provided in the enlarged portions of the wedge holes 17 and 27. The stoppers 15 and 25 can be joined by a method such as press fitting or screwing.

Hereinafter, the construction method of the PC culvert of this embodiment using the structure mentioned above is demonstrated.

3A and 3B are front and cross-sectional views illustrating a state in which a two-stage integrated bidirectional steel wire fixing device according to an embodiment of the present invention is assembled to a PC culvert;

First, excavation work is carried out to dig the site where the prefabricated PC culvert will be installed.

After excavation work, the foundation work should be carried out in consideration of sufficient consideration for drainage when placing the foundation concrete and assembling the product.

The horizontal degree of the foundation hole is confirmed, and the plurality of first PC culvert bodies 30A, 30B, and 30C constituting the first PC culvert body group 30 are mounted on the foundation hole.

Steel wire insertion holes 31 are formed in the diagonal four corners of each of the first PC culvert bodies CB, and accommodating grooves 33 in which steel wire fixing devices 1 are accommodated are disposed around the steel wire insertion holes 31. Is formed. At the inner corner of the diagonal, there is a chamfer (connecting ends extending a certain distance from the intersection of two straight lines). Since the chamfer is thicker than the edges of the four sides, it is possible to prevent the decrease in strength due to the formation of the receiving groove 33 for arranging the steel wire fixing device 1. In addition, as shown in Fig. 3a, the steel wire fixing device 1 is preferably inclined in the same direction as the chamfer line. Of course, the receiving groove 33 is also preferably formed by tilting in the same direction.

In addition, a shear groove (not shown) is formed at a cross-sectional edge of each of the first PC culvert bodies (CB), the eye bolt is fixed to the shear groove, and the backup material is firmly attached to the left and right sides of the shear groove with adhesive. It should not be dropped off and the joint is made so that the liquid does not leak out when grout is injected.

The first PC culvert body 30A, 30B, 30C having such a configuration is laid, the first PC culvert body group 30 after the first steel wire W1 is inserted into the first steel wire insertion hole 31 in the longitudinal direction. The tension is brought into close contact with the hydraulic tensioner 50.

That is, the starting point (left side of the drawing) of the first steel wire W1 is inserted into the starting point wedge 21a of the starting point fixing hole 20a of the steel wire fixing device 1a, and the end point of the first steel wire W1 (in the drawing). Right side) is inserted into the end wedge 11b of the end point fixing opening 10b of the steel wire fixing device 1b.

As described above, when the end portion of the first steel wire W1 inserted into both of the start stopper 20a and the end stop 10b is bitten by the hydraulic tensioner 50, and then tensioned with a predetermined tensile force by the hydraulic pump, each PC culvert main body The 30A, 30B, and 30C are in close contact with each other. Of course, the hydraulic tensioner 50 bites each of the four wires of the diagonal corner.

After the first PC culvert body group 30 is in close contact with the hydraulic tensioner 50 in the same manner as in the prior art, the excess steel wire of the end fitting 10b is cut off and removed.

Next, repeat the above operation as necessary.

That is, similarly to the 1st PC female body group 30, the some 2nd PC female body body 40A, 40B, 40C which comprises the 2nd PC female body body 40 is mounted in a base hole.

In addition, a steel wire insertion hole 41 is formed at each of the four diagonal corners of each of the second PC culvert bodies CB, and around the steel wire insertion hole 41, the steel wire fixing device 1 is accommodated and housed therein ( 43) is formed.

In addition, a shear groove (not shown) is formed at the edge of each second PC culvert body CB, and the eye bolt is fixed to the shear groove, and the backing material is firmly attached to the left and right sides of the shear groove with adhesive. It should not be dropped off and the joint is made so that the liquid does not leak out when grout is injected.

PC culvert body (40A, 40B, 40C) is laid, the second steel wire (W2) in the longitudinal direction is inserted into the second steel wire insertion hole 41, and then the second PC culvert body group (40) hydraulic tensioning machine ( 50) to be in close contact with each other.

That is, the viewpoint of the second steel wire W2 is inserted into and installed in the viewpoint wedge 21b of the parallel viewpoint anchoring hole 20b formed integrally with the terminal fixing hole 10b of the steel wire fixing device 1b, and the second steel wire W2 The end point of is inserted into the end wedge 11c of the end point fixing opening 10c of the steel wire fixing device 1c.

In this way, the end portion of the second steel wire (W2) inserted into both the start stopper 20b and the end stop 10c is bitten by the hydraulic tensioner 50, and then tensioned by a predetermined tension with a hydraulic pump, each PC culvert The main bodies 30A, 30B, and 30C are in close contact with each other. Of course, the hydraulic tensioner 50 bites each of the second steel wire (W2) of the four corners of the diagonal corner.

After the second PC arm body group 40 is in close contact, the hydraulic tensioner 50 is removed in the same manner as in the prior art, and the excess steel wire of the end stopper 10c is cut and removed.

When the steel wire is finished in the anchorage, as shown in Figure 3b, the first steel wire (W1) and the second steel wire (W2) is parallel to each other and tension-fixed in a zigzag form.

Further, since the wedge-cone and the end-locker are arranged in parallel in one wedge cone, the depth of the receiving grooves 33 and 43 of this embodiment is shallower than that of the conventional receiving groove in which the steel wire fixing device is arranged in series. Culvert molding is also easy.

As described above, in the present embodiment, since the two-stage integrated bidirectional fixing device is used to connect the products in series, the end steel wires are cut as in the prior art, and the start steel wires are bitten by the starting steel fasteners, and then the end fastening devices are reconnected. There is no inconvenience to assemble.

When the first PC female body group 30 and the second PC female body group 40 are connected in succession, two eye bolts facing each other are overlapped, and these connecting joints are fastened with a steel bar and the grout material is joined to the joint space groove (shear groove). Inject and integrate.

In the assembled PC culvert construction method according to the first embodiment as described above, the steel wire fixing apparatus 1 is applied to the PC culvert main body as a separate component.

4 and 5A show the case where the steel wire fixing device 1 is integrally embedded in the PC culvert body CB.

As shown in Fig. 4, the PC culvert is constructed with a steel wire fixing device 1 composed of parallel starting point fixing holes 20 and end point fixing holes 10, and the steel wire fixing device 1 inserted into the formwork. It is composed of a molded PC female body CB.

At this time, one end of the pipe P is installed in the reduced portion of the viewpoint wedge hole 27 of the viewpoint fitting 20. The pipe P may prevent the concrete from entering the viewpoint wedge hole 27 while forming the steel wire insertion hole 31.

In the installation of the pipe P, the support jaw 29 is placed on the end face of the wedge cone 2 so that the pipe P can be fitted. In this case, since the pipe P forms a steel wire insertion hole, a separate insert hole is unnecessary.

In addition, the enlarged portion of the end wedge hole 17 of the end point fitting 10 is closed by a closing plate EC or the like to prevent concrete from penetrating into the end wedge hole 17.

On the other hand, as shown in FIG. 5A, the steel wire insertion hole 32 may be formed by inserting the pipe P 'through the support jaw 29' in the viewpoint fitting hole 20 as well.

If the wire insertion hole 32 is formed in parallel by the pipe P and the pipe P ', the wire insertion hole does not need to be matched when joining the PC female main bodies.

In addition, since two steel wire insertion holes are formed in parallel, as shown in FIG. 5B, the end point of the steel wire W1 and the viewpoint of the steel wire W2 can be disposed to overlap each other in a predetermined section. Therefore, the overlapped portion has a large shear strength and can firmly prevent misalignment of the contact surface.

When the steel wire fixing device 1 is embedded, when the enlarged portion of the wedge hole is exposed (20a, 10b, 10c in FIG. 3b), the insert may be assembled without assembling the wedge, the elastic member, the stopper, and then assembled later. Do.

On the contrary, when the reduced wedge hole is exposed (10a, 20b, and 20c in FIG. 3b), insert molding is performed in the state of assembling the wedge, the elastic member, and the stopper.

As described above, various preferred embodiments of the present invention have been described with reference to the drawings, but various changes or modifications may be made to the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be apparent to those skilled in the art.

1 is an exploded perspective view showing a two-stage integrated bidirectional steel wire fixing device according to an embodiment of the present invention.

2 is a cross-sectional view of FIG.

Figure 3a and Figure 3b is a front view and a cross-sectional view A-A showing a state of assembling a two-stage integrated steel wire fixing device in a PC culvert according to an embodiment of the present invention.

4 is a cross-sectional view showing a PC culvert embedded with a two-stage integrated bidirectional steel wire fixing device according to another embodiment of the present invention.

5A is a sectional view of another insert embedded structure.

FIG. 5B is a sectional view of the PC culvert using FIG. 5A. FIG.

Figure 6 is an exploded perspective view of a conventional bidirectional steel wire fixing device.

7 is a cross-sectional view of the state combined with the steel wire in FIG.

Figure 8 is a side view for explaining the assembly step of the precast concrete (PC) box culvert in the state of Figure 7;

Figure 9 is an exploded perspective view of a steel wire fixing device according to another embodiment.

10 is a cross-sectional view of FIG.

11 is a cross-sectional view showing a state in which the steel wire fixing device of FIG. 10 is assembled to a PC culvert;

<Description of the symbols for the main parts of the drawings>

1: steel wire fixing device 2: wedge cone

3: groove 10,20: terminal stop, point stop

11,21: wedge 13,23: elastic member

15,25: stopper 17,27: wedge hole

29,29 ': Supporting jaw 30: 1PC female base body

30A, 30B, 30C: 1 PC female main body 31, 32: 1st steel wire insertion through

33,43: accommodation home 40: 2nd PC culvert body group

40A, 40B, 40C: 2nd PC female main body 41: 2nd steel wire insertion hole

50: hydraulic tensioning machine

CB: culvert EC: Finish

P, P ': Pipe W1, W2: Steel Wire

Claims (1)

culvert; A wedge hole is formed, the cross section of which is gradually reduced, the wedge cone having an enlarged portion of the wedge hole exposed to the outside of the culvert; It is composed of a pipe which is installed in the reduced portion of the wedge hole to form a steel wire insertion through hole, The pipe is embedded in the culvert, Wherein the wedge cone prefabricated PC culvert, characterized in that embedded in the culvert with the enlarged portion of the wedge hole exposed to the outside.

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