KR20180120552A - Steel wire joint for installing pc box culvert and pc box culvert using the same - Google Patents

Abstract

The present invention relates to a steel wire joining tool for installing an assembly type PC covered conduit and an assembly type PC covered conduit manufactured by burying the steel wire joining tool. The steel wire joining tool according to the present invention comprises: a joining pipe longitudinally arranged in one direction, and formed in a hollow shape such that a steel wire for joining the PC covered conduit can be inserted thereto; a front end insertion body formed in the hollow shape, fitted and coupled to a front end of the joining pipe, and formed with a female screw thread on an inner circumferential surface thereof; a first location fixing bolt formed in the hollow shape and screw-fastened to the front end insertion body; a rear end insertion body formed in the hollow shape, fitted and coupled to a rear end of the joining pipe, and formed with the female screw thread on an inner circumferential surface thereof; and a second location fixing bolt formed in the hollow shape and screw-fastened to the rear end insertion body.

Description

TECHNICAL FIELD [0001] The present invention relates to a steel wire connecting mechanism for a cantilever type PC cantilever and a PC cantilever including the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a construction auxiliary material used in civil engineering and construction fields, and more particularly, to a steel wire connecting mechanism for interconnecting steel wires embedded in a culvert buried in an underground.

Precast Concrete Box Culvert (hereinafter referred to as "PC culvert") is widely used for facilities such as water supply and drainage, electric power, communication, and public facilities. As shown in FIG. 1, a plurality of culverts 1 are sequentially connected in a line to install water pipes and the like. The culverts 2 are used to interconnect the culverts. 1, an insertion hole 3 into which a steel wire 2 can be inserted is formed at four corners of the PC culvert, and the insertion hole 3 extends over the entire length of the PC culvert. The steel wire 2 is sandwiched together with two or three adjacent PC culverts so that the PC culverts are interconnected. More specifically, the steel wire is pulled with the steel wire inserted into the insertion hole 3, so that two adjacent PC culverts are firmly connected.

As described above, in order to interconnect a plurality of PC culverts, an insertion hole into which a steel wire can be inserted is requested, and an insertion hole is provided in the same position and size in the PC cullet having the same size. This is because it is difficult to arrange the PC cages in a row if the insertion holes are located at different positions. For example, when the insertion hole of any one of the PC culverts is formed higher than the other, the culvert can not be connected because the culvert is pushed up when tensions are fixed. In addition, the insertion hole of the PC culvert should be smoothly formed on the inner peripheral surface throughout the longitudinal direction so that the steel wire can be inserted without resistance, and a straight line should be maintained throughout the longitudinal direction as designed.

However, in the case of the conventional PC culvert, the insertion hole for connecting the steel wire is not formed in a straight line like the portion indicated by A in the upper part of FIG. 2, The inner circumferential surface can be formed unevenly. Also, there is a problem that the entrance and exit portions of the insertion hole exposed to both sides of the PC culvert are different from the designed positions.

The reason for this is as follows. The PC culvert is formed by pouring concrete into a mold and curing it. 2, the reinforcing bars 5 are placed in a long form on the mold while the reinforcing bars 5 are sandwiched between the rubber hoses 6, and the concrete c is placed in a mold (not shown) When the hose 6 and the reinforcing bar 5 are pulled out, the insertion hole 3 is formed in the concrete. If only the reinforcing bars 5 are installed on the mold frame to form the insertion holes 3, the concrete c and the reinforcing bars 5 are attached, so that the reinforcing bars 5 can not be separated later. Therefore, the insertion hole 3 is formed by using the hose 6 made of rubber which is not attached to the concrete. In the case where only the soft hose 6 is inverted, the insertion hole can not be formed because the hose is completely compressed by the weight of the concrete.

The hose 6 and the reinforcing bar 5 are used together to form the insertion hole 3. Since the hose is soft, when the concrete is laid, the surface of the hose cries and the inner peripheral surface of the hose becomes uneven An insertion hole is formed. In addition, since the reinforcing bars are easily bent, when the standard of the PC culvert becomes large, the central portion of the reinforcing bars is struck downward, so that the insertion holes do not straighten as shown in FIG. 2A, or the positions of the insertion / do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a steel wire connecting mechanism for allowing an insertion hole for connecting a steel wire of a prefabricated PC culvert to be smoothly formed straight.

Another object of the present invention is to provide a PC culvert using the above-mentioned steel wire connecting mechanism.

On the other hand, other unspecified purposes of the present invention will be further considered within the scope of the following detailed description and easily deduced from the effects thereof.

According to another aspect of the present invention, there is provided a cable connection apparatus for a cantilever-type PC culvert comprising: a connection pipe formed in a hollow shape so as to be inserted into a PC cable connection cable; A tip insert formed in a hollow shape and fitted to a tip end of the coupling tube and having an inner peripheral surface formed with a female screw hole; A first position fixing bolt formed in a hollow shape and screwed to the end insertion body; A rear end insert formed in a hollow shape and fitted to a rear end of the connection pipe and having an inner peripheral surface formed with a female screw hole; And a second position fixing bolt formed in a hollow shape and screwed to the rear end insertion body.

According to the present invention, it is preferable to further include a protruding bar protruding radially from the outer circumferential surface of the connecting pipe to prevent rotation in the concrete cured body.

In one embodiment of the present invention, the end insertion body is provided with an inlet portion whose diameter gradually decreases from one side to the other side, and an annular flange portion protruding from the outer peripheral surface along the radial direction. Likewise, the rear end insertion body is formed with an annular flange portion projecting from the outer circumferential surface along the radial direction.

According to another aspect of the present invention, there is provided a prefabricated PC culvert comprising: a frame formed by pouring concrete into a mold frame and having a trench portion formed concavely from an inner circumferential surface thereof, a hollow portion surrounded by an inner circumferential surface of the frame, A PC cage body formed; And a steel wire connecting mechanism installed on the frame, wherein the connecting tube, the front end insert and the rear end insert of the steel wire connecting mechanism are embedded in the frame, and the first position fixing bolt and the second position fixing bolt, And the second position fixing bolt is fastened to the front end insert and the rear end insert from the outside of the frame.

According to the present invention, the rear end insertion body is provided at one end of the trench portion, the front end insertion body is provided at the other end, and the connection pipe arranged in the opposite direction is inserted into the front end insertion body and the rear end insertion body, respectively.

The prefabricated PC culvert manufactured using the steel wire connecting mechanism according to the present invention can solve the conventional problems. That is, in the present invention, the PC culvert is manufactured by putting the concrete in a state in which the connecting pipe of the hard PVC material is firmly coupled to the mold by the end insert, the rear insert, the first position fixing bolt and the second position fixing bolt , The steel wire insertion hole can be formed in the same manner as the design method.

In addition, since the inside of the hard connection tube is a steel wire insertion hole, not only the inner circumferential surface of the insertion hole is smoothly formed, but also the central portion of the insertion hole can be formed straight and straight without being warped or bent.

In addition, since the entrance of the end insert is formed in the shape of a trunk tube, the insertion direction of the steel wire is guided, which is advantageous in that the steel wire can be easily installed.

On the other hand, even if the effects are not explicitly mentioned here, the effect described in the following specification, which is expected by the technical features of the present invention, and its potential effects are treated as described in the specification of the present invention.

1 is a perspective view showing a state in which a plurality of PC culverts are continuously installed.
2 is a schematic vertical cross-sectional view of a PC culler in order to explain a problem of a conventional steel wire pier of a PC culvert.
3 is a schematic exploded perspective view of a steel wire connecting mechanism according to the present invention.
Fig. 4 is a schematic plan view of a PC cage including the steel wire connecting mechanism shown in Fig. 3 together with an enlarged longitudinal sectional view of an important part.
5 is an exploded perspective view showing a mold frame and a steel wire connecting mechanism for manufacturing the assembled PC culvert according to the present invention.
6 is a schematic cross-sectional view of an AA line in a state in which the mold and the wire connecting mechanism of Fig.
Fig. 7 is a schematic cross-sectional view of the BB line in a state in which the mold and the wire connecting mechanism of Fig. 5 are arranged in a correct position. Fig.
* The accompanying drawings illustrate examples of the present invention in order to facilitate understanding of the technical idea of the present invention, and thus the scope of the present invention is not limited thereto.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

The present invention relates to a steel wire connecting mechanism mounted on a prefabricated PC culvert and a prefabricated PC prefabricated culvert using the same. The PC culvert is connected in a row in a row and is used as a water supply / drainage pipeline, a power supply, and a communication area. In order to connect a plurality of PC culverts in series, the steel wire must be tension-fixed with the steel wire inserted into a plurality of PC culverts together. The steel wire connecting mechanism according to the present invention is a mechanism for inserting and connecting a steel wire to a PC culvert as described above.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

Fig. 3 is a schematic exploded perspective view of a steel wire connecting mechanism according to the present invention, Fig. 4 is a schematic plan view of a PC cage including the steel wire connecting mechanism shown in Fig. 3 and an enlarged longitudinal sectional view of an important part.

3 and 4, a steel wire connecting mechanism 50 according to the present invention includes a connecting pipe 10, a front end insert 20, a first position fixing bolt 29, a rear end insert 30, And a two-position fixing bolt (39).

The connection pipe 10 is embedded in the frame of the PC culvert and is long in one direction and is formed in a hollow shape so that the steel wire p can be inserted. And a plurality of protruding bars 11 protruding along the radial direction on the outer circumferential surface of the connection pipe 10. [ In the present embodiment, the protruding bars 11 are elongated along the longitudinal direction of the connecting pipe 10, and are arranged at equal angular intervals along the circumferential direction of the connecting pipe 10.

The tip end insert 20 is embedded in the frame of the PC cowl and is formed in a hollow shape and is fitted to the tip end side of the connection pipe 10. The steel wire (p) is inserted into the connecting pipe (10) through the front end insert (20). The inlet portion 21 of the end insertion body 20 is formed so that the diameter gradually decreases from one end to the other end so that the insertion of the steel wire p can be facilitated. On the inner circumferential surface of the leading end insertion member 20, a female screw thread for screwing with a first position fixing bolt 29 to be described later is formed. In addition, annular flange portions 22 and 23 protruding along the radial direction are formed on the outer circumferential surface of the end insertion body 20. The flange portions 22 and 23 are for preventing the distal end insertion body 20 from being detached from the outside in a state of being embedded in the frame of the PC culvert.

The rear end insertion body 30 is also embedded in the frame of the PC cage and is formed in a hollow shape and fitted to the opposite side of the front end insertion body 20, that is, the rear end side of the connection pipe 10. The steel wire (p) is inserted into the front end insert (20), the connecting tube (10), and the rear end insert (30) sequentially. Also, a female screw thread is formed on the inner peripheral surface of the trunk 31 of the rear end insertion chip body 30 as well. Also, annular flange portions 32 and 33 are formed to protrude from the outer peripheral surface of the rear end insertion body 30 to prevent the rear end insertion body 30 from being separated from the frame of the PC cage .

The connecting pipe 10, the front end insert 20 and the rear end insert 30 described above are all made of hard PVC, and it is particularly preferable to economically manufacture the PVC using the recycled PVC.

The first position fixing bolt (29) and the second position fixing bolt (39) are formed in a hollow shape, and a male thread is formed on the outer circumferential surface for screw tightening. The first position fixing bolt 29 and the second position fixing bolt 39 are screwed to the front end insertion body 20 and the rear end insertion body 30, respectively. The head portions of the first position fixing bolt 29 and the second position fixing bolt 39 are not embedded in the frame of the PC cowl but are disposed outside the trench portion h or outside of the PC cowl to be described later, Will be explained together with the manufacturing process of the prefabricated PC culvert in the back.

A method of manufacturing a prefabricated PC culvert using the steel wire connecting mechanism 50 having the above-described construction will be described.

Fig. 5 is an exploded perspective view showing a mold frame and a steel wire connecting mechanism for manufacturing a prefabricated PC culvert according to the present invention, Fig. 6 is a schematic sectional view of an AA line in a state in which the mold and the steel wire connecting mechanism of Fig. And Fig. 7 is a schematic cross-sectional view of the BB line in the state in which the form frame and the steel wire connecting mechanism of Fig. 5 are arranged in position.

5, the mold frame for forming the PC culvert comprises an inner frame 60 and an outer frame 70 disposed around the inner frame 60. As shown in FIG. A substantially quadrangular frame defining the main body of the PC culvert is formed by filling and hardening the concrete in the space portion s between the inner mold 60 and the outer mold 70. [ Inside the frame, for example, a hollow portion functioning as a flow path of water supply and drainage is formed.

For reference, FIG. 5 shows molds continuously arranged for the sake of convenience of explanation. In general, however, molds are not formed so as to be consecutively arranged, but are formed individually. In the mold for making a single culvert, only one inserting frame denoted by reference numeral 80 is disposed at the center of the inner mold 60.

For convenience of description of the disposition state of the wire connecting mechanism and the manufacturing process, the description will be made on the assumption that the form frames are continuously arranged as shown in FIG.

In the four corners of the inner mold 60, the insertion molds 80 for forming the trenches h are disposed apart from each other (actually, only one is disposed at the center of the inner mold). The insertion mold 80 has a substantially trapezoidal shape, a wide lower portion and a narrow upper portion. The interior of the insertion mold 80 is formed as an empty space as shown in the longitudinal section of FIG. The insert mold 80 is fastened to the corner face of the inner mold 60 with a bolt 89 or the like.

The end insertion body 20 is fixed to the one end of the insertion mold 80 by the first position fixing bolt 29 in the form of the above-described structure. That is, a hole is formed at the center of one end face of the insert mold 80, and a tip insertion body 20 is disposed at one side of the hole, and the first position fixing bolt 29 is inserted through the hole into the tip insertion body 20 ). The rear end insertion body 30 is fixed to the other end of the insertion mold 80 in the same manner as described above. In other words, a hole is formed in the other end of the insert mold 80, and the second position fixing bolt 39 is fixed to the rear end insertion body 30 through the hole. Since the inside of the insert mold 80 is empty, it is possible to tighten the screw by hand. The connecting tube 10 is inserted into the front end insertion body 20 and the rear end insertion body 30. 5, the connecting tube 10 is inserted between the two insertion molds. However, when the cage is manufactured by a single method as described above, The tip insert and the rear insert are respectively provided on both sides of the insert mold 80 and the two connection tubes are respectively installed so as to extend from the tip insert in the opposite eaves (see FIG. 4).

The first position fixing bolt 29 and the second position fixing bolt 39 are engaged with the insertion mold 80 so that the position is fixed even when the concrete is poured, . The first position fixing bolt 29 and the second position fixing bolt 39 are all made of steel.

As described above, when the inner mold 60, the outer mold 70, the insert mold 80, and the steel wire connecting mechanism 50 are installed, the entire facility for manufacturing the PC culvert is completed. In this state, when the space s between the inner mold 60 and the outer mold 70 is sealed and the concrete c is filled, the PC cage main body is formed. Although not shown, reinforcement bars for reinforcement of the rigidity of the PC culver are preliminarily laid in a matrix shape along the entire circumferential direction and the longitudinal direction in the upper space part (s).

When the concrete is filled in the space portion s, the connecting pipe 10, the front end insertion body 20 and the rear end insertion body 30 are embedded in the concrete. However, since the head portions of the first position fixing bolt 29 and the second position fixing bolt 39 are disposed in the trench portion h, they are not buried in concrete but exposed to the outside.

When the curing of the concrete is completed, the bolt 89 fastened to the inner mold 60 and the insert mold 80 is first loosened, and the inner mold 60 is taken out from the PC culvert. When the inner mold 60 is detached, the lower surface of the insert mold 80 is exposed to the outside (the hollow portion of the PC culvert). The first position fixing bolt 29 and the second position fixing bolt 39 can be separated.

 When the first position fixing bolt 29 and the second position fixing bolt 39 are separated, the insertion mold 80 having a trapezoid wider than the upper portion can be pulled out toward the hollow portion of the PC cowl. Finally, after separating the outer mold 70, the PC culvert in which the steel wire connecting mechanism 50 is buried is completed. The first position fixing bolt 29 and the second position fixing bolt 39 can be inserted again after inserting the steel wire p into the connection pipe 10. [

After the PC culvert is manufactured, the process of connecting the PC culverts continuously and installing the water and sewage pipes will be briefly explained. The steel wire p is inserted into the steel wire connecting mechanism 50 provided in each PC culvert while the adjoining PC cullet is slightly spaced. After the steel wire is inserted into the two PC culverts and the steel wire is pulled by using a fixing device (not shown for convenience of explanation) and a tensioner, the adjacent PC cages are closely contacted and the connection is completed. In this way, PC culvert can be installed by connecting PC culverts sequentially. The tensioning and settlement of the steel wire corresponds to a known technique in the related field, so a detailed description will be omitted.

As described above, when the PC culvert is manufactured using the steel wire connecting mechanism 50 according to the present invention, the problems occurring in the prior art can be solved. That is, conventionally, reinforcing bars and rubber hoses are disposed in a mold frame and concrete is laid, so that the steel wire insertion holes 3 in the PC culvert are struck or ruggedly formed. More seriously, there is a problem that the positions of the entrance and exit of the insertion hole are slightly spaced vertically and horizontally due to the weight of the concrete. However, in the present invention, the connection pipe 10 made of a hard PVC material is fixed to the mold frame by the front end insert 20, the rear end insert 30, the first position fixing bolt 29 and the second position fixing bolt 39 The steel wire insertion hole 3 can be formed exactly as designed. In addition, since the inside of the rigid connecting tube functions as an insertion hole, the inner circumferential surface of the insertion hole is formed in a straight line so that insertion of the steel wire is facilitated.

In addition, since the entrance of the end insert is formed in the shape of a trunk tube, the insertion direction of the steel wire is guided, which is advantageous in that the steel wire can be easily installed.

The scope of protection of the present invention is not limited to the description and the expression of the embodiments explicitly described in the foregoing. It is again to be understood that the present invention is not limited by the modifications or substitutions that are obvious to those skilled in the art.

10 ... connector, 11 ... protruding bar
20: end insertion body, 21: inlet portion, 22, 23: flange portion
30 ... rear end insert body, 31 ... torso, 32, 33 ... flange portion
29 ... first position fixing bolt, 39 ... second position fixing bolt
50 ... steel wire connecting mechanism
60 ... inner mold, 70 ... outer mold, 80 ... insert mold
p ... steel wire, c ... concrete, s ... space part

Claims (6)

A connection pipe which is long in one direction and is formed in a hollow shape so that a steel wire for connecting the PC culvert can be inserted;
A tip insert formed in a hollow shape and fitted to a tip end of the coupling tube and having an inner peripheral surface formed with a female screw hole;
A first position fixing bolt formed in a hollow shape and screwed to the end insertion body;
A rear end insert formed in a hollow shape and fitted to a rear end of the connection pipe and having an inner peripheral surface formed with a female screw hole; And
And a second position fixing bolt formed in a hollow shape and screwed to the rear end insertion body. The method according to claim 1,
Further comprising a protruding bar protruding in the radial direction from the outer circumferential surface of the connection pipe so as to prevent rotation in the concrete cured body. The method according to claim 1,
Wherein the end insertion body is provided with an inlet portion whose diameter gradually decreases from one side to the other and an annular flange portion projecting from the outer circumferential surface along the radial direction. The method according to claim 1,
Wherein the rear end insertion body is formed with an annular flange portion projecting radially from the outer circumferential surface thereof. A PC culvert main body having a frame formed by pouring concrete into a mold and having a trench formed concave from an inner circumferential surface thereof and having a hollow portion surrounded by an inner circumferential surface of the frame at a central portion; And
And a steel wire connection mechanism according to any one of claims 1 to 4, which is installed in the frame,
The connecting pipe, the front end insert, and the rear end insert of the steel wire connecting mechanism are embedded in the frame, and the first position fixing bolt and the second position fixing bolt are inserted from the outside of the frame into the front end insertion member and the rear end insertion member Wherein the first and second plates are fastened to each other. 6. The method of claim 5,
Wherein the rear end insertion body is provided at one end of the trench portion, the front end insertion body is provided at the other end, and the connection pipes arranged in opposite directions are inserted into the front end insertion body and the rear end insertion body, respectively.

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