KR20160099150A - Bridge construction method using anchorage device for tendon axis displacement control - Google Patents

Abstract

The present invention provides a method to construct a girder bridge by using an anchorage apparatus for tendon axis adjustment, to easily match axes of anchor heads which are anchored in an anchorage device buried in the inside of a girder after tension to improve a pre-stress introduction effect. According to the present invention, the anchorage apparatus for tendon axis adjustment comprises: an anchorage device including an anchoring plate; an anchor head supported by the anchoring plate; and an anchor head support block which includes a horizontal block where the anchor head and the anchor head support block come in point or surface contact with each other, and an extended horizontal block integrally formed with the horizontal block to be fixed and installed in the anchoring plate.

Description

TECHNICAL FIELD [0001] The present invention relates to a girder bridge construction method using a fixing device for a torsional rigid frame,

The present invention relates to a method of constructing a girder bridge using a fixing device for a tension member center-tune adjustment. More specifically, it is possible to easily adjust the center axis of the anchor head to be fixed after the tension to the fixing device installed in the girder, thereby improving the effect of introducing the prestress. Girder bridge construction method.

Generally, the girder bridges are constructed in such a manner that a girder is installed in a longitudinal direction (longitudinal direction) between an alternation and a pier or a pier and a pier, and a bottom plate (slab) is installed on the upper surface of the girder.

Also, the bridge between the piers (alternating) and the piers is called a span, and the bridges in which the bridges of the bridges are separated are simple bridges.

At this time, the single span girder bridges are constructed in such a manner that a girder is interposed between the alternation and alternation, and a slab is installed on the girder.

The multi span girder bridges are constructed by installing a plurality of alternating and pier angles, alternately installing the slab between the piers and placing the girders on the girders.

Fig. 1A shows the girder.

The girder 50 includes an upper flange 51, an abdomen 52 and a lower flange 53. The girder 50 forms a side fixing block 60 on both outer sides of the abdomen 52, 60 are provided together with the tension fixing part 61 and the fixing part 62 for repair and reinforcement.

Accordingly, the tension fixation unit and the repair and fixing fixture unit are formed together to tighten and fix the tensile members 54 and 55. As a result, the construction work is poor and safety There was a problem that accidents were frequent.

In the case of using the PSC girder as the girder, the tension device used in the PSC girder uses a fixing device (including an anchorage hole, an anchor head, and a wedge) and a tension member.

However, there is a problem that when the tension member is fixed after the tension is applied to such a fixing apparatus, there is no device that can easily maintain and adjust the tension force while maintaining the tension or tension.

Specifically, the conventional fixing port 10 for the PSC girder is a kind of housing which is installed to penetrate the prestressing member 30 used for introducing the prestress, as shown in FIG. 1B.

The right end of the fixing port 10 is formed in the form of a corrugated pipe so as to connect the sheath 40 for tension material installed inside the girder and fix the fixing head 11 and the fixing head 11 made of casting or the like to the corrugated pipe, And a fusing plate 13 for dispersing local stress while being located at a predetermined position.

The tension member 30 passing through the fixing hole 10 is drawn out of the fixing hole 10 and passes through the anchor head 20. After the tension member 30 passing through the anchor head 20 is tensed, The tension member is fixed to the anchor head 20 using a wedge by using the wedge 50.

At this time, the anchor head 20 is supported by the fusing plate 13 of the fixing head 11 by the prestress.

However, in the process of fixing a plurality of the tension members 30 individually or after tensioning, the anchor head 20 moves upward, downward, leftward, and rightward on the fixing plate 13 so that the center axis of the fixing port 10, The center axes of the heads 20 do not actually coincide with each other, which is more likely to occur when the tension members are disposed inside the girders in the form of a parabola.

The prestress introduced by the tension member can not be properly introduced into the girder, so that the tension member 30 is tensioned and fixed so that the central axis of the fixation port 10 and the central axis of the anchor head 20 coincide with each other The quality control in the field was often less than expected.

Accordingly, the present invention provides a method of constructing a girder bridge using a fixing device for a prestressing core structure capable of tensioning and fixing a tension member in a state in which a center axis of an anchor head and an anchor head installed on a girder are easily aligned in a field. To solve the problem.

In order to achieve the above object,

A method for constructing a short-span bridge using a fixing device for a tie-rod and a tie-

(a) a first prestress is first introduced into a girder by causing the first prestressing material to be fixed after being strained by using a fixing device for a prismatic tie-rod adjusting device at both ends of the girder when the girder is manufactured, Fabricating a girder so as to be embedded in both end faces of the girder; And

(b) installing a slab on the upper part of the girder after the girders are installed alternately, wherein the fixing device for a center member for adjusting a torsion member is integrally formed with a fixing head so that a tension member is positioned on the surface of the girder A fixture including the fixation plate for dispersing local stress; An anchor head fixed to the fixation plate through a tension member hole after being strained through the fixation hole; And an anchor head supporting block including a horizontal block in which the anchor head and the anchor head supporting block are in point contact or surface contact with each other, and an enlarged horizontal block integrally formed with the horizontal block and fixed to the fixing plate. A girder bridge construction method using a fixing device for a building fixation is provided.

Also, in a method of constructing a multi-span bridge using a fixing device for a tensional material and a tension member,

(a) a first prestress is first introduced into a girder by causing the first prestressing material to be fixed after being strained by using a fixing device 100 for a prismatic central structural unit on both end faces of the girder when the girder is manufactured, Fabricating the girder so that the fixing plate is embedded in both end surfaces of the girder;

(b) a girder upper surface tension portion having a predetermined depth is cut off at an upper surface spaced apart from the center at one end of the girder, and the other end portion to be positioned at the continuous point portion is cut off at the upper end of the girder, Forming a girder so that a sheath for a second tension material is provided so as to communicate with the upper surface tension portion of the girder and the upper space portion at the upper end of the girder portion so as to form the lower end space portion B;

(c) The girder is installed so as to extend over the end portion and the continuous portion so that the girder portion upper end space portion is opposed to each other at the successive portion so that the extended portion connecting space (E) ; And

(d) connecting the sheath for the second tension member facing the continuous point portion to the continuous point portion connection pipe so as to match the longitudinal linear curvature of the bridge utilizing the expanded focal point connection space and maximize the vertical eccentricity And a step of placing the slab on the upper part of the girder after the girder bridge construction.

At this time, the fixing device 100 for a tenter material center-

First, by setting the anchor head supporting block capable of restraining the position of the anchor head in advance on the fixing plate, and positioning the anchor head in contact with the anchor head supporting block, it is possible to easily set the center axis of the anchor head and the anchor head And when the prestress by the tension member is introduced, the anchor head is supported by the anchor head support block to restrain the movement. Thus, the operator does not need to make efforts to align the center axis of the anchor head with the anchor hole.

Second, the anchor head support block may be fixed to the surface of the anchor head so that one side of the anchor head can be supported, and may be formed as a kind of support block. Thus, the anchor head and the anchor head supporting block are brought into a supported state by one point contact with each other.

At this time, since the anchor head supporting block by the one-point contact restrains movement of the anchor head only in one direction, the anchor head supporting block is formed into a shape having a receiving groove, for example, a U-shaped receiving portion, When the part is inserted and supported, point contact occurs in different directions, so that the anchor head can be restrained even by three-point contact.

Further, if the contact surface of the anchor head supporting block is formed of the curved surface portion S in the same shape as the contact surface of the anchor head so that the surface contact is not the point contact, more stable anchor head support is possible and restraint becomes easy.

Since the girder bridges using the fixing device for central axis adjustment according to the present invention can use all of the first, second and third tensions, it is possible to improve the effect of introducing the tensions, thereby enabling the construction of a short span or multi span girder bridge favorable for maintenance .

According to the present invention, the operator can easily introduce the prestress into the girder by aligning the center axis of the anchor head with the fixture, and PT work is possible in a state where the position of the anchor head is constrained, .

Further, in providing the spacer according to the kind of the tension member in matching the center axis of the anchor head with the fixture, it is very advantageous in quality control of the tension member.

FIG. 1A is a girder construction diagram using a conventional side fusing block,
FIG. 1B is a view showing the installation of the conventional anchorage head and anchor head,
FIGS. 2A, 2B, and 2C are diagrams illustrating an example of a fixing device for adjusting a center member of a tension member according to the present invention;
FIG. 2d is a view showing the use of the anchor head used in the present invention,
FIG. 3A and FIG. 3B are views showing a construction procedure of a girder using a fixing device for a center member of a tie member according to the present invention, and a single span girder bridge using the same.
FIGS. 4A and 4B are a view illustrating a girder connection using a fixing device for a tentative core adjustment according to the present invention, and a construction sequence of a multi-span girder bridge using the same.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Fixing Apparatus (100) for Tension Material Center Tune Adjustment According to the Present Invention)

FIGS. 2A, 2B and 2C are views illustrating an example of a fixing device 100 for a tenter material center-tune adjustment according to the present invention. Each of the fixing devices 100 for a torsion centering unit is divided in accordance with the supporting method of the fixing plate 113 constituting the anchor head supporting block 200 and the fixing device 100 for adjusting the center of the tension member.

[Example 1]

FIG. 2A is an exemplary view of a fixing device 100 for a tenter material center-tune adjustment according to a first embodiment of the present invention.

First, the fixing device 100 for the tie member center-tie fixation can be purchased as a prefabricated product, and if the separate production facility for the present invention is required, the purchase price of the fixing device 100 for the tie member center-

Accordingly, only the anchor head supporting block 200 in the form of a block capable of supporting the anchor head 120 is additionally installed in the fixing hole 110 constituting the fixing device 100 for a center member for adjusting tensions.

The fixing device 100 for a tenter material central axis adjustment includes an anchor head 120 and a fixing hole 110 embedded in a girder.

First, the girder is a beam member for introducing a prestress like a PSC girder, and is not limited to a member provided with other fixing devices.

The end of the fixing port 110 is formed as a corrugated pipe type and has a fixing head 111 formed integrally with the corrugated tube so as to connect the sheath for the tension member installed in the inside of the girder, And a fusing plate 113 formed integrally with the reinforcing bar 112 and the fixing head 111 to disperse local stress while being positioned on the surface of the girder.

At this time, the fusing plate 113 may be formed to be embedded or protruded on one side of the girder, for example, in the form of a rectangular plate. The anchor head supporting block 200 is fixed to the fusing plate 113.

The anchor head supporting block 200 according to the first embodiment is configured such that the anchor head 120 and the anchor head supporting block 200 are in contact with each other at one point (indicated by one point in FIG. 2A) And a horizontal block 210, which is a rectangular parallelepiped block that is in one-point contact with the outer peripheral surface of the head.

In this case, when the horizontal block 210 is directly fixed to the fixing plate 113, stress can be concentrated on a portion where the horizontal block and the fixing plate are in contact with each other, and the anchor head supporting block 200 is fixed A cross-sectional loss of the horizontal block 210 may occur when the fastener 260 is fastened.

An extended horizontal block 220 having a larger cross section than the horizontal block 210 is integrally formed with the horizontal block 210. The extended horizontal block 220 is fixed to the fixing plate 113 by a fastener such as an anchor bolt (260).

The anchor head supporting block 200 composed of the horizontal block 210 having the two rectangular cross sections and the extended horizontal block 220 is fixed to the fixing plate 113 and is fixed to the anchor head supporting block 200 It can be seen that the anchor head 120 is supported by the point contact.

Accordingly, the anchor head supporting block 200, which imposes stress dispersion on the anchor head 120 and the prestress, effectively restrains the movement of the anchor head 120 due to the tension and fixation of the tension member, It becomes possible to introduce the prestress into the girder.

The anchor head supporting block 200 which supports the anchor head 120 in contact with the lower portion of the anchor head 120 restrains the upward, downward, leftward and rightward movement of the anchor head 120 in the fixing plate 113 when the tension member is tensed and fixed The center axis of the fixing member 110 and the center axis of the anchor head 20 can be aligned with each other when the tension member is tensed and fixed, thereby enhancing the effect of introducing the prestress by the tension member.

[Example 2]

FIG. 2B is an exemplary view of a fixing device 100 for a tenter material center-tune adjustment according to a second embodiment of the present invention.

The second embodiment differs from the first embodiment in that the horizontal block 210 of the anchor head supporting block 200 is a block having a rectangular cross section in the first embodiment, while a U-shaped horizontal block is adopted in the second embodiment There is a difference.

Specifically, as shown in FIG. 2B, the fixing device 100 for a center member for adjusting a tension member according to the second embodiment also includes a fixing hole 110 and an anchor head 120, which are embedded in a girder.

The fixture 110 is also formed in the shape of a corrugated tube so that the sheath for the tension member installed inside the girder is connected to the fixture head 110. The fixation head 111 made of cast iron or the like is embedded in the corrugated tube, And a fusing plate 113 for dispersing local stress while positioning the fixing head 111 on the surface of the girder.

At this time, the fusing plate 113 may be formed to be embedded or protruded on one side of the girder in the form of a rectangular plate. The anchor head supporting block 200 is fixed to the fusing plate 113.

The anchor head supporting block 200 according to the second embodiment is configured such that the anchor head 120 and the anchor head supporting block 200 are in contact with each other at three points (indicated by three dots in FIG. 2B) And a U-shaped horizontal block 230 contacting the outer peripheral surface of the head at three points.

That is, the outer circumferential surface of the anchor head 120 is supported at three points on the inner side of the U-shaped horizontal block 230, so that the anchor head 120 is inserted and supported inside the U-shaped horizontal block 230 .

When the U-shaped horizontal block 230 is directly fixed to the fusing plate 113, the stress may be concentrated on a portion where the U-shaped horizontal block 230 and the U-shaped horizontal block 230 contact with the fixing plate , A cross-sectional loss of the U-shaped horizontal block 230 may occur when a fastener 260 for fixing the anchor head supporting block 200 to the fixing plate 113 is fastened.

An extended horizontal block 220 having a larger cross section than the U-shaped horizontal block 230 is integrally formed with the U-shaped horizontal block 230. The extended horizontal block 220 is fixed to the anchor bolt As shown in FIG.

The anchor head supporting block 200 is fixed to the fixing plate 113 and the anchor head 120 is set by three-point contact with the anchor head supporting block 200.

The anchor head supporting block 200 which imposes stress dispersion on the anchor head 120 and the prestress also restrains the movement of the anchor head 120 due to the tension and fixation of the tension member, It is possible to introduce a prestress into the system.

[Example 3]

FIG. 2C is an exemplary view of a fixing device 100 for a tenter material center-tune adjustment according to a third embodiment of the present invention.

The third embodiment differs from the first embodiment in that the horizontal block 210 of the anchor head supporting block 200 is a rectangular cross-section block in the first embodiment, while the horizontal block 210 in the third embodiment is a curved horizontal block There are differences in points.

Specifically, as shown in FIG. 2C, the fixing device 100 for a center member for adjusting a tenter material according to the third embodiment also includes a fixing hole 110 and an anchor head 120, which are embedded in a girder.

The fixation port 110 also has a corrugated pipe shape at the end thereof to connect the sheath for the tension member installed inside the girder. The fixation head 111, which is made of cast iron or the like, and the fixing head 111 are wrapped around the corrugated pipe, And a fusing plate 113 for dispersing local stress while positioning the fixing head 111 on the surface of the girder.

At this time, the fusing plate 113 may also be formed in a rectangular plate shape so as to be embedded or protruded on one side of the girder, and the anchor head supporting block 200 is fixedly installed on the fusing plate 113.

The anchor head supporting block 200 according to the third embodiment is a type in which the anchor head 120 and the anchor head supporting block 200 are brought into surface contact with each other and is a curved horizontal block which is in surface contact with the outer peripheral surface of the anchor head, 240, respectively.

That is, it can be seen that a part of the outer circumferential surface of the anchor head 120 is supported by the curved surface portion C of the curved horizontal block 240.

As a result, the contact area between the anchor head and the anchor head support block 200 is increased, which makes it possible to more stably support the anchor head.

In this case, when the curved horizontal block 240 is directly fixed to the fixing plate 113, stress can be concentrated on the portion where the curved horizontal block 240 and the curved horizontal block 240 contact with the fixing plate, When the fastener 260 for fixing the anchor head supporting block 200 is fastened to the fixing plate 113, a sectional loss of the curved horizontal block 240 may occur.

An extended horizontal block 220 having a larger cross section than the curved horizontal block 240 is integrally formed with the curved horizontal block 240 and the extended horizontal block 220 is fixed to the fixing plate 113 by an anchor bolt As shown in FIG.

As a result, the anchor head supporting block 200 is fixed to the fixing plate 113, and the anchor head 120 is set by surface contact with the anchor head supporting block 200.

As a result, the anchor head supporting block 200, which imposes stress dispersion on the anchor head 120 and the prestress, also restrains the movement of the anchor head 120 due to the tension and fixation of the tension member, It becomes possible to introduce the prestress into the girder.

FIG. 2D is a view showing the use of the anchor head 120 used in the present invention, and shows an example of the installation of the anchor head 110 and the anchor head 120. FIG.

That is, it can be seen that the fixing plate 113 is first installed on the girder, and the fixing plate 113 can be formed in the form of a rectangular plate, and is formed integrally with the fixing head 111. The reinforcing bars 112 ) Is also formed.

The tension member is prepared, the tension member is inserted into the sheath for tension member, and the both ends of the tension member are arranged to be pulled out through the fixing plate 113.

The tension member drawn from the fusing plate 113 is initially set on the fusing plate 113 by using the inner anchor head 121.

As shown in FIG. 2d, the inner anchor head 121 has a plurality of through-holes formed therein, and the inner anchor head 121 is formed by threading on the outer periphery of the inner anchor head 121, Is set.

The ring nut type anchor head 120 is fastened to the fixing plate 113 by an anchor head supporting block 200. The ring nut type anchor head 120 is fastened to the fixing plate 113

As shown in FIG.

In other words, when the tension member is tensed using a hydraulic jack (not shown) at the end of the tension member, the tension member is tensed and the position is shifted to the left (indicated by an arrow mark). Accordingly, the ring nut type anchor head 120 is also moved to the inner anchor head 121 To the left.

Then, the position-shifted ring nut type anchor head 120 is rotated so that the inner anchor head 121 is supported on the fusing plate 113 so that the tension force introduced into the tension member can be maintained.

Thereby, the amount of rotation of the ring nut type anchor head 120 can be adjusted to fine tune the introduced tension force.

[Method of constructing a girder bridge using the fixing device 100 for a center member of a tension member of the present invention]

FIG. 3A and FIG. 3B are views showing a construction sequence of a girder using a fixing device for a central axis adjustment according to the present invention and a single span girder bridge using the same.

FIGS. 4A and 4B are views showing a girder connection using a fixing apparatus for a central axis adjustment according to the present invention and a construction sequence of a multi-span girder bridge using the same.

[Single span girder and girder bridge construction method using it]

First, an example of a short-span PSC girder as shown in FIG. 3A will be described.

The PSC girder (A) for short span is manufactured from a prestressed reinforced concrete having an I-shaped cross section, and a prestressing material is disposed inside the prestressing prestressing sheath. The prestressing material 300 is mainly composed of a first prestressing material 310, a second prestressing material 320 and the third tensional element 330, respectively.

At this time, the first tensional material 310 is installed as a reinforced concrete girder in order to sufficiently secure the flexural rigidity of the self weight of the PSC girder and all or a part of the self weight of the slab It can be said to be tense,

The second tensional material 320 may be a tension material installed to resist a live load (common load, etc.) acting after the slab is formed after the PSC girder is alternately placed,

The third prestressing material 330 may be a tensile material that is additionally installed to maintain and reinforce the bridge such as the PSC girder and the connecting concrete formed at the continuous point portion after completion of the bridge construction.

3B, the first tensions 310 are arranged in a parabolic shape between the fixing devices in a state where they are disposed on both end surfaces of the PSC girder, Tense and settled.

Of course, such a first tensional element 310 is arranged by the sheath for tension material arranged inside the girder, and a PS strand can be used.

At this time, the first tensional element 310 is determined such that its installation amount is adjusted so as to sufficiently resist the self weight of the PSC girder and all or a part of the self weight of the slab formed at the upper portion.

Next, the second tensions 320 are disposed between the fixing devices 100 for torsion centering structures exposed on the upper surface of the girder as shown in FIG. 3B, and then they are tensioned and fixed.

Although the second tensional element 320 has a smaller installation amount than the first tensional element 310, if the torsion and settlement of the end surface of the PSC girder manufactured to have a low profile are minimized, It can not be ensured.

Furthermore, since the PSC girder is alternately tilted and fixed after being mounted on the pier, there is a safety problem due to the complicated work and there is a problem that the workability is inevitably lowered when the tension and fixing work are performed around the end of the PSC girder.

The tensioning and fixing operation of the second tensional material 320 is carried out from the upper surface of the PSC girder so that the second tensional material 320 can be formed on the upper surface of the girder (the slab upper surface after the slab is installed) 3a and 3b, a girder upper surface tension portion B is formed by cutting a part of the upper surface of the girder at a position spaced apart from both ends of the PSC girder toward the center.

Thus, the second tensional element 320 is tensioned and fixed at the upper surface tension portion B of the girder at a position spaced from the both end surfaces of the PSC girder toward the central portion.

The size of the upper surface tension portion B of the girder is minimized to such an extent that the fixing device can be accommodated, thereby minimizing the cross-sectional loss of the PSC girder.

The second tensional material 320 is also disposed inside the PSC girder by sheath for the tensional material. The second tensional material 320 is disposed inside the PSC girder in the form of a parabola, After the completion, tension is settled.

The third prestressing member 330 is installed to solve the problem that the introduced prestress is lost as the time passes after the PSC girder is alternately mounted and the slab is installed.

First, the PSC girder is provided with a sheath for a tension material to be installed in advance, and the third prong material 330 is inserted into a sheath for tension material at a later stage if necessary.

Thus, the sheath to which the third tensional material 330 is to be installed must be installed at a position where the sheath can be easily accessed after completion of the bridge.

As shown in FIGS. 3A and 3B, the sheath for tensioning is installed in the fixing portion D for the third tension member formed between the girder lower flange and the abdomen at a position spaced from both ends of the girder toward the center of the girder.

During the use of the bridges, the third tensions (330) inserted by inserting the third tensions (330) into the sheath for the ties are tensed and fixed by using the fixing device (100) So that a compression prestress can be additionally introduced.

In this case, any one of the fusing device 100 for a torsion centering device used for the first torsion material, the second torsion material and the third torsion material may be used.

3B illustrates a girder bridge construction method using the single span girder according to FIG. 3A.

That is, in the case where a girder 500 having a fixing device 100 for a tie member center-tie adjustment is formed, a single span girder bridge is constructed, and the girder is a PSC girder.

The girder 500 includes a first torsion material 310, an upper torsion material second torsion material 320, and a third torsion material 330, which are inserted into the sheath through which the girder 500 is inserted, Span girder bridges are constructed by using the tension members 310, 320, and 330 and the fixing device 100 for a tie center adjustment.

The first tension member 310 may be installed on the girder 500. The first tension member may be fixed to the girder at both ends of the girder by using the fixing device 100 for adjusting the center member of the tension member, So that the prestress is introduced at an early stage.

The anchor head supporting block 200 according to the above-described FIG. 4A, FIG. 4B or FIG. 4C may be formed in the fixing plate 113 for the first tension member 310 for the tension member.

At this time, the fixing device 100 for the center member for the adjustment of tension is installed in the fixing part D for the third tension member, and the sheath for the third member for tensioning is connected between the fixing device 100 for the center member for adjusting the tension member, The girder 500 is manufactured so that the fusing plate 113 is first embedded in the fusing unit for the third tension member.

In the fixing device 100 for a tentative core adjustment, the anchor head supporting block 200 according to the above-described FIG. 4A, FIG. 4B or FIG. 4C may be formed on the fixing plate 113.

Next, after the girders 500 are installed between the shifts 600, the slabs 700 are installed on the girders.

At this time, the upper part of the girder 500, which is spaced from the both ends of the upper part of the girder 500 at the time of fabrication, is cut to form a girder upper surface tension part B having a predetermined depth. The sheath for the second tension material is installed.

After the slab is installed, the second tension member 320 is inserted into the sheath for the second tension member, so that the second tension member is tensioned and fixed by the fixing device 100 for adjusting the center member of the tension member at the upper surface tension portion of the girder, 500 and the slab 700 together with a compressive prestress.

In this case, the fixing device 100 for the tension member centering structure for the second tension member 320 may be formed by using the anchor head supporting block 200 according to the above-described FIG. 4A, FIG. 4B or FIG. 4C formed in the fixing plate 113 .

After the completion of the bridge, the third tension member 330 is passed through the fixing device 100 for the center member for adjusting the tensions and the anchor head 120 is passed through the fixing member D for the third tension member. After straining the tension member 330, the tension member 330 is fixed to the anchor head 120 by using a wedge.

At this time, the anchor head 120 may use a ring-nut type anchor head having an inner anchor head 121.

[Multi span girder and girder bridge construction method using it]

First, a connection structure of a PSC girder for multiple spans will be described with reference to FIG. 4A.

In the case of the above-described multi-span PSC girder, it is basically not much different from that of the single span PSC girder.

Also, the PSC girder for span type is a prestressed reinforced concrete having an I-shaped cross section, and is constructed such that a sheath is used to arrange the sheath in the sheath. The sheath is mainly composed of the first prestressing material 310, the second prestressing material 320, (330).

The first tensional elements 310 are also installed on the respective girders in order to sufficiently secure the flexural rigidity of the self weight of the PSC girder and all or part of the self weight of the slab,

The second tensions 320 are also installed to resist live loads (common loads, etc.) acting after the slab is formed after the PSC girders are alternately mounted.

The difference between this multi-span PSC girder and the single span PSC girder (A) is that these second tensions are installed continuously to the continuous focal points via each girder.

This is because it is necessary to install the girder so that the girders are connected to each other with respect to the continuous point portion.

Further, the third tensional element 330 is further provided to maintain and reinforce the bridge such as the PSC girder and the connecting concrete formed at the continuous point portion after completion of the bridge construction, and the difference from the PSC girder (A) The third tensional material is continuously installed on the continuous focal point via each girder.

The second tensional material and the third tensional material are continuously passed through the continuous focal point portion, and only the first tensional material is fixed after the tension on both end surfaces of each girder.

Specifically, the first tension member 310 is disposed in the form of, for example, a parabolic line between the fixing devices in a state where the fixing device 100 for tension member center-tune adjustment is disposed on both end surfaces of the PSC girder, (Not shown) arranged inside the girder.

The second tension member 320 is also tensioned and fixed after being disposed between the fixing apparatuses by using the fixing apparatus 100 for tension member central axis adjustment. And the girder upper surface tension portion B formed by cutting the upper surface of the girder so as to be formed on the upper surface (the upper surface of the slab after the slab construction).

Such a second tensional material 320 is also tensioned and fixed after the slab is completed after the installation of the girder in the order of construction.

Also, the third tensional element 330 may be disposed in the PSC girder in advance, and the third tensional element 330 may be inserted into the sheath for the tensional element 330, if necessary, And the sheath for tensioning is installed in the fixing part D for the third tension member formed between the girder lower flange and the abdomen at a position spaced from both ends of the girder toward the center of the girder.

As shown in FIG. 4B, the position where the bridge pillar 800 is installed can be referred to as a continuous point portion where a bending moment is generated. In such a continuous point portion, the adjacent multi-span PSC girders are structurally connected to each other.

This is accomplished in particular by the way of continuing the second tensions 320, where the adjacent distance of the end of the conventional girders is about 30 cm for economical reasons.

Accordingly, the working space for connecting the second tensions 320 to each other is narrow and the workability is very poor. Also, since the height of the tops of the end portions of the adjacent girders do not coincide with each other, it is not easy to match the longitudinal linear curvatures.

Further, in the curved bridge, it is very difficult to arrange the second tensions in a narrow space so that the second tensions are arranged with a radius of curvature at successive fulcrums.

As shown in FIG. 4B, in the case of the multi-span girder according to the present invention, a girder upper surface tension portion B having a certain depth is formed on the upper surface of one end portion of the girder at an end portion such as an alternating portion, And the other end portion to be positioned at the fulcrum portion is cut off to form the space portion F at the upper end of the girder fulcrum portion.

Thus, it can be seen that the multi-span PSC girder adjacent to each other at the consecutive point portion forms a focal point connection space E extended by the upper end space portion F of the girder point portion.

In the case of the multi-span PSC girder, in particular, the second tensional element is formed by a girder upper surface tension portion B formed at the end portion portion and a girder tip portion upper space portion F formed at the continuous point portion, So that both end portions of the first and second protrusions are extended,

The second tension members are continuously arranged from the one side girder to the other side girder via the continuous point portion,

The third tension member is continuously disposed on the other girder through the continuous fulcrum portion from one side girder of the sheath for tensioning material.

The sheath for the second tensional tension member and the sheath for the third tensional tension member via the continuous focal point portion are connected to each other by the continuous focal point connection tube 900.

Further, as shown in FIG. 4A, the exposed end of the sheath for the second tensional material extending in the space portion F at the upper end of the girder portion is formed by the enlarged sectional enlarged portion G, The ends of the tube are inserted and connected so as to facilitate the arrangement of the curves of the second tensions at the successive fulcrums.

4B shows a case of a multi-span girder bridge. That is, at least one bridge 800 is formed between the alternations 600, so that the girders 500 are successively connected to each other by the two bridge supports at the continuous focal point.

At this time, when a multi-span girder bridge is constructed by using the girder 500 formed with the fixing device 100 for a center member for adjusting a tie, the girder is also a PSC girder.

The girder 500 includes a first tensional element 310, an upper tensional element, a second tensional element 320, and a third tensional element 330, which are end tensions inserted into the sheath installed through the inside of the girder 500 Span bridge construction in which the girder 500 is installed at a continuous point portion such as an alternate long end point portion and a pier bridge by using the tension member 300 and the fixing device 100 for adjusting the center member of the tension member, do.

First, a fixing device 100 for a tension member center-tune adjustment is installed in a fixing part for a third tension member which is formed so as to be in contact with the upper surface of the lower flange of the girder and the side surface of the lower part of the abdomen at a position spaced from one end of the girder 500 toward the center of the girder. However,

The sheath for the third tension material is connected between the fixing device 100 for the center member for adjusting the tension member and the fixing plate 113 is first embedded in the fixing part D for the third tension member.

Further, the girder upper surface tension portion B having a predetermined depth is formed by cutting the upper surface spaced apart from the one side end portion of the girder 500, and the other end portion to be positioned at the continuous point portion is cut from the upper The girder upper end space portion B is formed so that the sheath for the second tension material is provided so as to communicate with the girder upper surface tension portion and the girder end portion upper end space portion B.

Next, the manufactured girder 500 is installed so as to extend over the end portion and the continuous portion, so that the girder portion upper end space portion is opposed to each other at the continuous point portion, E) are formed.

Next, the sheath for the second tension member facing the continuous point portion is made to coincide with the longitudinal linear curvature of the bridge by utilizing the extended fulcrum connection space, and a continuous fulcrum portion such as a pipe member After connecting to the connecting pipe 900, the slab 700 is installed on the girder 500.

Next, after the completion of the bridge, the third tensional material is tensioned and fixed to the third tensional material fixing portion via the continuous focal point portion by using the fixing device 100 for adjusting the tensional material central axis. That is, after the third tension member 330 is passed through the anchor head 120 through the fixing device 100 for the center member for adjusting the tension member, the third tension member 330 is tensioned , And fixed to the anchor head 120 using a wedge.

At this time, the anchor head supporting block 200 according to the above-described FIGS. 4A, 4B and 4C is formed on the fixing plate 113. FIG.

At this time, the exposed end of the second tension member extending in the upper space portion of the girder continuous fulcrum portion is formed of the enlarged cross-sectional enlarged portion G so that the end portion of the continuous fulcrum connecting tube is inserted So as to facilitate the arrangement of the curves of the second tensions at the continuous fulcrum portion,

The second tension member 320 is caused to pass through the girder upper surface tension portion of one side of the girder and the upper side girder upper surface tension portion of the adjacent girder through the girder upper portion space portion, So that the compression prestress is introduced into the entire girder and the slab,

The first tension member 310 may be installed on the girder along with the second tension member 320. The first tension member may be fixed at both ends of the girder during the manufacture of the girder by using a fixing device 100 for adjusting the center member of the tension member, So that the compression prestress is introduced into the girder at an early stage,

The sheath for the second tension member facing the continuous point portion is connected to the continuous point portion connection pipe 900 and the sheath for the third tension member facing the continuous point portion is also connected to the separate continuous point portion connection pipe And then the slab is formed on the upper portion of the girder so that the third tensional material 330 passes through the continuous focal point portion.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Fixing device for central axis adjustment
110: anchorage
111: Fixing head 112: Rebar
113: Fusing plate 120: Anchor head
200: Anchor head supporting block
210: horizontal block 220: extended horizontal block
230: U-shaped horizontal block 240: Curved horizontal block
300: Tension material
310: first tension member 320: second tension member
330: Third tension member
500: Girder 600: Shift
700: Slab 800: Pier
900: continuous connection part connection tube S: curved part

Claims (15)

A method of constructing a short span bridge using a tension member (300) and a fixing device (100) for a center member of a tension member,
(a) the first prestressing member 310 is fixed to both end surfaces of the girder by using the fixing device 100 for the prismatic center-tune adjustment when the first prestressing member 310 is manufactured, Fabricating the girder 500 so that the fixing plate 113 of the fixing apparatus 100 is installed on both end surfaces of the girder; And
(b) installing the slabs (700) on the girders after the girders (500) are installed between the alternating (600)
The fixing device 100 for a center member for adjusting a center member for a torsion fixture includes a fixation plate 113 integrally formed with a fixation head 111 and having a fixation plate 113 for dispersing a local stress while being positioned on a surface of a girder 500, (110); An anchor head 120 which is fixed to the fixing plate 113 after the tension member 300 penetrating the fixing hole 110 through the tension member hole and is supported by the fixing plate 113; And a horizontal block 210 in which the anchor head 120 and the anchor head supporting block 200 are in point contact or face contact with each other and an extended horizontal block 220 integrally formed with the horizontal block and fixed to the fixing plate And an anchor head support block (200) configured to support the girder bridge structure. The method according to claim 1,
In the step (a), the upper surface of the girder 500 spaced from the both ends of the girder 500 at the center is cut so that a girder upper surface tension portion B having a predetermined depth is formed. The girder upper surface tension portion B) of the second tension member is provided on the lower portion of the girder bridge. 3. The method of claim 2,
After the slab installation in the step (b), the second tensional material 320 is inserted into the sheath for the second tensional material to cause the second tensional material to be tensed and deformed by the fixing device 100 for adjusting the center- And a compression prestress is introduced into the girder and the slab so as to fix the girder and the slab. The method of claim 3,
After the installation of the slab 700 in the step (b), the third tension member (D) for the third tension member formed to contact the upper surface of the lower flange of the girder and the side surface of the lower abdomen at a position spaced toward the center of the girder 330) through the anchor head (120) through the fixing device (100) for the adjustment of the central member for adjusting the tensions and then fixing the third tensions (330) to the anchor head (120) Construction method of girder bridges using a fixing device for center - of - gravity tie fixation. The method according to claim 1,
Wherein the horizontal block (210) is a rectangular parallelepiped block, and the anchor head supporting block is supported on the fixing plate by the one-point contact of the outer peripheral surface of the anchor head with the horizontal block. The method according to claim 1,
The horizontal block 210 is a U-shaped horizontal block, and the outer peripheral surface of the anchor head is inserted into the U-shaped receiving portion of the U-shaped horizontal block so that the anchor head supporting block is supported on the fixing plate by three- A method of girder bridge construction using the apparatus. The method according to claim 1,
The horizontal block 210 is a curved horizontal block, and the anchor head is supported on the fixing plate by the surface contact of the outer circumferential surface of the anchor head with the curved surface of the curved horizontal block. In the girder bridge construction Way. The method according to claim 1,
The anchor head (120)
The tension member extending from the fixing plate 113 is initially set in the fixing plate 113 by using the inner anchor head 121. The inner anchor head 121 is formed by threading the outer anchor head 121, 121 are fixed by a wedge so that the tension member is passed through and a ring nut type anchor head 120 is fastened to the threads to rotate the ring nut type anchor head 120, (121) is supported on the fixing plate (113) so that the tension applied to the tension member can be maintained. In a multi-span bridge construction method using a tension member (300) and a fixing device (100)
(a) the first prestressing member 310 is fixed to both end surfaces of the girder by using the fixing device 100 for the prismatic center-tune adjustment when the first prestressing member 310 is manufactured, Fabricating the girder 500 so that the fixing plate 113 of the fixing apparatus 100 is embedded in both end surfaces of the girder;
(b) a girder upper surface tension portion having a predetermined depth is cut by cutting the upper surface spaced apart from the center at one end of the girder (500), and the other end portion to be positioned at the continuous point portion is cut Thereby forming a girder upper end space portion B so that a sheath for a second tension material is provided so as to communicate with the girder upper surface tension portion and the upper end space portion of the girder post portion;
(c) The manufactured girder 500 is installed so as to span the end portion and the continuous fulcrum portion so that the girder fulcrum upper portion space portion is opposed to each other at the successive fulcrums, E) < / RTI > And
(d) a sheath for the second tension member facing the continuous point portion is made to coincide with the longitudinal linear curvature of the bridge utilizing the extended fulcrum connection space and the vertical fulcrum is maximized, And a step of placing the slab on the upper part of the girder. 10. The method of claim 9,
In the step (b), the exposed end of the fusing unit for the second tension member, which is extended to the space at the upper end of the girder continuous fulcrum, is formed as the enlarged cross-sectional enlargement unit, So that the curvilinear arrangement of the second tensions can be facilitated at the continuous fulcrum portion,
The second tensional material is passed through the upper surface of the girder upper surface space portion from the upper surface girder upper surface space portion of the girder so as to go through the upper surface portion of the girder of the adjacent girder and after the slab is constructed, Wherein the compression prestress is introduced into the entire girder and the slab by tensioning after the tensioning by the device. 10. The method of claim 9,
After the installation of the slab 700 in the step (d), the third tension member (D) for the third tension member formed to contact the upper surface of the lower flange of the girder and the lower surface of the lower abdomen at a position spaced toward the center of the girder 330) through the anchor head (120) through the fixing device (100) for the adjustment of the central member for adjusting the tensions and then fixing the third tensions (330) to the anchor head (120) Construction method of girder bridges using a fixing device for center - of - gravity tie fixation. 10. The method of claim 9,
Wherein the horizontal block (210) is a rectangular parallelepiped block, and the anchor head supporting block is supported on the fixing plate by the one-point contact of the outer peripheral surface of the anchor head with the horizontal block. 10. The method of claim 9,
The horizontal block 210 is a U-shaped horizontal block, and the outer peripheral surface of the anchor head is inserted into the U-shaped receiving portion of the U-shaped horizontal block so that the anchor head supporting block is supported on the fixing plate by three- A method of girder bridge construction using the apparatus. 10. The method of claim 9,
The horizontal block 210 is a curved horizontal block, and the anchor head is supported on the fixing plate by the surface contact of the outer circumferential surface of the anchor head with the curved surface of the curved horizontal block. In the girder bridge construction Way. 10. The method of claim 9,
The anchor head (120)
The fixing head is formed by using a fixing head 130 and a ring nut. The fixing head is formed with a plurality of through holes, and the fixing head is formed on the outer circumference surface of the fixing head. The fixing head penetrates through the fixing head, The fixing member is fixed to the fixing screw so that the fixing member is supported by the fixing plate so that the tension member is caused to be squeezed by the fixing plate, the fixing head and the ring nut. Then, when the fixing member is strained and the fixing head is separated from the fixing plate, Wherein the ring nut is mounted on the fixing plate by rotating the fixing nut.

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