KR101313886B1 - Apparatus for constructing V-shaped tower to reduce cross-section of top of bridge using jack-up and method thereof - Google Patents

Abstract

The present invention relates to a V tower construction apparatus and a construction method for reducing the upper cross-sectional force of the bridge using jack-up. The present invention has a plurality of "V" shaped inclined tower and the elevating mechanism for elevating the inclined tower in the middle of the upper surface of the bridge upper structure and connected between the front and rear end of the bridge upper structure and the front and rear upper ends of the inclined tower. Equipped with tension cable, it is possible to lower the height of the inclined tower, so it is less influenced by the wind load, and the unsupported distance is short, which makes it possible to use economical members. The tension of the tension cable can be adjusted so that the tension can be adjusted in one place, making it easier to adjust the tension, and there is no need to add a separate process for adjusting the tension, and the height of the tower is lowered for ease of installation. The visual stability is high, which allows the personnel to perform stable work, and the plurality of tension cables It is possible to adjust the tension of the tension cable simply by elevating the inclined tower by the lifting mechanism without tension or relaxation, respectively, which simplifies the cable tension adjustment work and does not require additional equipment, so it can be installed very economically. Will be.

Description

{Apparatus for constructing V-shaped tower to reduce cross-section of top of bridge using jack-up and method approximate}

The present invention relates to a V-type tower construction apparatus and a construction method for reducing the cross-sectional force of an upper portion of a bridge using jack-up. More specifically, the tower height is lowered so that it is less influenced by wind load, and the unsupported distance is short, which is economical. It is possible to use, tension adjustment is made in one place, so it is easy to adjust tension, and there is no need to add a separate process for tension adjustment, and the height of the tower is easy to install and high visual stability Therefore, the work personnel can perform stable work, tension adjustment work of tension cable is simple, and V-type for reducing the cross-sectional force of the upper part of the bridge using jack-up that can be installed very economically without additional equipment. It relates to a tower construction apparatus and a construction method.

In general, the ILM bridge launching method (ILM) is used to manufacture one segment by dividing one span into two or three equal parts at the manufacturing site where the superstructure of the bridge is pre-installed at the rear of the bridge. The prestress is introduced into the prefabricated superstructure by the post tension method to push the equilibrium compressive force that can pass through the space and then push it by special extrusion equipment in the direction of the bridge's bridge. The merits and the challenges to be solved coexist.

① The ILM bridge construction method is easy to manage because the production site for producing the segment is constant, and the insulation equipment is installed in the workshop, so the construction can be carried out regardless of the external weather conditions. Therefore, the process of 1 cycle is decided, and the construction can be repeated repeatedly without delay.

② Because the formwork is mechanized, the formwork can be dismantled quickly and the mold can be manufactured with high degree of cross-sectional dimension.

③ Since all processes such as concrete placing and prestressing work are done in a certain place (production site), there is an advantage that the material can be transported conveniently and the work can be streamlined.

④ It is restricted by the installation site because it is necessary to secure the production site paper for manufacturing the segment behind the shift or the rear of the first piers.

⑤ The longer the span length, the higher the cross-sectional height and self weight, and the longer the length of the extruded nose. Therefore, considering the limit of section height, design limitations such as stress in construction, workability, economical efficiency, etc., the application range is up to 60m.

⑥ If the principal is short, it is uneconomical because the initial investment cost such as extrusion nose and production facility is high.

In particular, during extrusion, the upper girder has a cantilevered structure until it reaches the next pier, and due to such adverse conditions, excessive cross-sectional force is generated during extrusion.

In order to control the generated cross-sectional force, in general, an extrusion propulsion nose is installed at the tip of the girder or a cross-sectional angle is set at the center of the bridge to reduce the span length during construction. However, in recent years, the application of the ILM method to long span bridges is increasing interest in reducing the cross-sectional force during extrusion.

Extrusion nose installation methods, cross-sectional angle installation methods, temporary tower and cable installation methods, and bidirectional extrusion methods are known as cross-sectional force reduction methods.

Extrusion nose installation method is the most commonly used method to install the extrusion propulsion nose at the tip of the girder, connecting the propulsion nose having a length of 60-70% of the span length to the girder by the tension material, the installation is simple and constructability On the other hand, the longer the span, the higher the nose stiffness is required, and there is a disadvantage that a separate device for the tip deflection is required.

Cross-link angle installation method is a general vent type to install a cross-angle angle in the center of the span, the cross section force is reduced by half the span length, and has the advantage that it can be extruded safely among the hypothesis, but is affected by the topographical conditions Therefore, there is a disadvantage that it is not suitable for rivers, coasts and high piers.

Temporary tower and cable installation method is to install steel cable at the top of girder to install the static moment at the tip of the girder, which can be applied to long span compared to other methods. However, since the tension of the cable according to the alternating cross-sectional force during extrusion is to be adjusted, there is a disadvantage that additional construction know-how is required accordingly.

The bidirectional compression method is a method in which both girders are extruded at the end of the bridge at the same time to be closed at the center. There is a disadvantage in that the construction cost for such equipment is doubled.

In addition, in the conventional temporary tower and cable installation method, as shown in Figure 17 and 18, the temporary tower (1) is installed vertically in the middle of the center of the bridge upper structure (G), and the upper end of the temporary tower (1) and A plurality of cables (3) and (4) are connected between both ends of the upper portion of the bridge upper structure (G), and a cable tensioning device (not shown) is installed in each of the cables (3) and (4) to connect the cable (3) ( By increasing or decreasing the tension of 4), the cross-sectional force generated in the upper bridge structure G is adjusted according to the position of the upper bridge structure G.

That is, as shown in FIG. 17, when the temporary tower 1 passes through the center portion of the span, a static moment is generated at the center portion of the bridge upper structure 1, and the space between the bridge upper structure G and the cable 3 is increased. At the connection point position of (4), the parent is generated. Therefore, when the temporary tower 1 passes through the center portion of the span, an additional cross-sectional force is generated in the upper bridge structure G by relaxing the cables 3 and 4 by a cable tension device provided for each cable 3 and 4. Do not do it.

As shown in FIG. 18, when the temporary tower 1 passes through the girder point, the parent moment is generated at the tower 1 position and the connection point of the cable 3 and 4 with the section of the bridge upper structure G. Positive moment will be generated at the position. Therefore, when the temporary tower 1 passes through the girder point, the tension is reduced by the vertical force in the girder point by tensioning the cables 3 and 4 by the cable tensioning device provided for each cable 3 and 4. At the girder fixing point position of the cables (3) and (4), the parent moment should be generated to reduce the static moment.

Therefore, the conventional temporary tower and cable installation method has a number of problems as follows.

In the case of the pole ILM bridge, the height of the tower reaches 40 ~ 50m, and the structure becomes huge, so the influence on the wind load is large, and there are problems such as the need for a high rigid cross section for stability of the temporary tower. . Therefore, further review of the stability during the hypothesis is needed. This problem is more serious in the case of high bridges.

Tension and relaxation of the cable (3) (4) during extrusion has a problem that the workability is lowered because it must be performed repeatedly.

Since the cable tensioning device provided for each of the plurality of cables 3 and 4 must be operated separately, the amount of work is increased, and thus there is a problem that the workability is further reduced.

Since the construction personnel for cable tension management should be placed at the top of the girder at all times during extrusion, there is a problem that the construction cost increases due to the increase in construction staff.

Corresponding to the height of the tower there is a problem that the workability is lowered according to the operation and installation of the temporary equipment.

Equipment operation is added for cable tension, and there is a problem in that the number of construction cycle days is added when the number of cables is large.

Accordingly, an object of the present invention is to provide a V-shaped tower construction apparatus and a construction method for reducing cross-sectional cross-sectional force of a bridge using jack-ups by lowering the height of a tower to have a low impact on wind load and a short unsupported distance to enable the use of economical members. I will.

Another object of the present invention is to make the tension adjustment in one place to facilitate the tension adjustment, V-shaped tower hypothesis device for reducing the upper cross-sectional force of the bridge using the jack-up to avoid the need to add a separate process for the tension adjustment And hypothesis methods.

Another object of the present invention is the height of the tower is easy to install and the visual stability is high, according to the V-type tower hypothesis device and hypothesis for reducing the upper cross-sectional force of the bridge using the jack-up to enable the work personnel to perform a stable work To provide a way.

Another object of the present invention is to simplify the tension adjustment of the tension cable and to provide a v-type tower construction apparatus and construction method for reducing the upper cross-sectional force of the bridge using a jack-up that can be installed very economically because no additional equipment is input. I will.

In order to achieve the above object, the present invention includes a sloped tower having a lower end positioned on an upper surface of an upper structure of the bridge and having a "V" shape which is spread in the front-rear direction while going upward; An elevating mechanism provided between an upper surface of the bridge upper structure and a lower portion of the inclined tower to elevate the inclined tower; It provides a V-shaped tower construction apparatus for reducing the upper cross-sectional force of the bridge portion using a jack-up comprising a tension cable connected between the front and rear of the bridge upper structure and the front and rear upper ends of the inclined tower.

The elevating mechanism includes a jack base block fixed to the center of the upper surface of the bridge upper structure, and a hydraulic jack fixed to the upper surface of the jack base block, the inclined tower is a tower base seated on top of the elevating mechanism The front and rear portions of the block and the front and rear portions of the tower base block are rotatably supported in the front and rear directions, respectively, and are provided with a pair of front and rear inclination members installed inclined forwardly and rearwardly, respectively, and the front and rear pair of inclination members. It is configured to include a connecting cable connecting the top.

The jack base block is provided with a plurality of guide posts, and the tower base block is provided with a guide hole corresponding to the guide post.

The jack base block includes a tower support post, and further includes a plurality of shim plates inserted and stacked between an upper end of the tower support post and a lower surface of the tower base block.

And a lug coupled to the front and rear ends of the elevating tower, a cable bracket fixed to the front and rear ends of the bridge top structure, and cable tie and cable tie respectively coupled to upper and lower ends of the tension cable. The cable tie coupled to the bottom of the cable and the cable bracket are connected by a connecting pin, and the cable tie and lug coupled to the top of the tension cable are connected by a connecting pin.

In addition, the present invention, in order to achieve the above object, the inclined tower having a pair of inclined members which are provided in the upper surface of the upper structure of the bridge, and the front and rear of each of the elevating driving mechanism to the upper and the rear, respectively. Installing a, connecting the front and rear of the bridge upper structure and the top of the inclined tower with a tension cable; A first section in which the bridge upper structure generates a parent moment in the bridge upper structure at an inclined tower position by the extrusion device and generates a moment in the bridge upper structure at a connection point between the bridge upper structure and the tension cable; Extruding the second section in which the constant moment is generated in the upper structure of the bridge at the inclined tower position and repeatedly passing the second section in which the parent moment is generated in the upper structure of the bridge at the connection point of the upper structure of the bridge and the tension cable. ; Reducing the parent and static moment of the bridge upper structure by raising the inclined tower by the elevating mechanism in the first section to tension the tension cable; Reducing the static moment and the parent moment generated in the upper bridge structure by relaxing the tension cable by lowering the inclined tower by the elevating mechanism in the second section; It provides a V-type tower construction method for reducing the upper cross-sectional force of the bridge using a jackup made up.

The elevating mechanism includes a jack base block fixed to the center of the upper surface of the bridge upper structure, and a hydraulic jack fixed to the upper surface of the jack base block, the inclined tower is a tower base seated on top of the elevating mechanism The front and rear portions of the block and the front and rear portions of the tower base block are rotatably supported in the front and rear directions, respectively, and are provided with a pair of front and rear inclination members installed inclined forwardly and rearwardly, respectively, and the front and rear pair of inclination members. It comprises a connecting cable 140 connecting the upper end to the inclined tower by the lifting mechanism in the first section to raise the tension cable, and then the plurality of shims between the jack base block and the tower base block It is preferable to insert and stack plates.

The present invention has a plurality of "V" shaped inclined tower and the elevating mechanism for elevating the inclined tower in the middle of the upper surface of the bridge upper structure and connected between the front and rear end of the bridge upper structure and the front and rear upper ends of the inclined tower. With the tension cable, the height of the inclined tower can be lowered, so it is less influenced by the wind load and the unsupported distance is short, which makes it possible to use an economical member.

In addition, the present invention can adjust the tension of the plurality of tension cables by elevating the inclined tower by the elevating mechanism, so that the tension adjustment is made in one place, it is easy to adjust the tension, add a separate process for the tension adjustment There is no need.

In addition, the present invention is easy to install by lowering the height of the tower, the visual stability is high, thereby enabling the personnel can perform a stable operation.

In addition, the present invention can adjust the tension of the tension cable by simply elevating the inclined tower by the lifting mechanism without tensioning or relaxing the plurality of tension cables respectively, simplifying the cable tension adjustment work, without additional equipment Therefore, it is possible to construct very economically.

1 to 9 is a view showing a first preferred embodiment of the V-shaped tower construction apparatus for reducing the upper cross-sectional force of the bridge using the jack-up according to the present invention,
1 is a side view showing a V-shaped tower construction apparatus for reducing the upper cross-sectional force of the bridge using the jack-up of the present invention,
2 is a sectional view taken along the line AA in Fig. 1,
3 is a front view and a side view of the inclined tower vertically;
4 is an enlarged view of a portion “B” of FIG. 1;
Fig. 5 is a front view of Fig. 4,
6 is a cross-sectional view taken along line CC of FIG. 4;
7 is a sectional view taken along the line DD of FIG. 4;
8 is an enlarged view of a portion “E” of FIG. 1;
9 is an enlarged view of a portion “F” of FIG. 1;
10 is a comparison of the present invention and the prior art,
11 to 16 is a process chart showing a V-type tower construction method for reducing cross-sectional cross-section force using the jack-up according to the present invention,
17 and 18 are schematic diagrams for explaining the construction process of an ILM bridge of the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

In FIG. 1, 10 is a bridge upper structure such as a girder, and 20 is a bridge.

V-shaped tower temporary construction device for reducing the upper cross-sectional force of the bridge using the jack-up according to the present invention, the lower end is supported on the bridge upper structure (10), and inclined tower (Tower) (100) to form a "V" shape in the front and rear direction as it goes upward. )Wow; An elevating mechanism 200 fixedly installed at a center portion of the bridge upper structure 10 to elevate and operate the inclined tower 100; A pair of tension cables (Cable) (300) and (400) before and after each of the lower ends are connected to the front and rear ends of the bridge upper structure (10), respectively, and are connected to the front and rear upper ends of the inclined tower (100). (See FIG. 1).

The inclined tower 100 is a front and rear pair of inclined members 110 and 120 are installed to be inclined forward and rear, respectively, while the lower end is located close to each other, and the front and rear pair of inclined members 110 and 120 The lower end of each is configured to include a tower base block (Tower Base Block) 130 is rotatably connected in the front and rear direction. The front and rear pair of inclined members 110 and 120 may each have a pair of tower beams 111 and 121 that connect the left and right pairs of tower beams 111 and 121, respectively. It consists of two bracings 112 and 122. The tower beams 111 and 121 may use pipes or beams, and the bracing 112 and 122 may use angles or pipes. The bracing 112 and 122 are horizontal members installed horizontally at regular intervals along the length direction of the tower beams 111 and 121, and diagonal members installed diagonally between both ends of the horizontal members. It can be configured (see FIG. 2 and FIG. 3 above).

The tower base block 130 includes a base 131 and a pair of left and right hinge pieces 132 coupled to the upper surface of the base 131 at regular intervals in a horizontal direction, and the base 131 ) And the hinge piece 132 is reinforced by a plurality of reinforcing ribs (133). Lower and rear ends of the inclined members 110 and 120 are connected to the front and rear sides of the hinge piece 132 by connecting pins 135 and 136 so that the inclined members 110 and 120 are connected to the tower base block 130. It is comprised so that rotation is possible in the front-back direction with respect to () (refer FIG. 4 and FIG. 5 above). Since the hinge pins 135 and 136 are symmetrical back and forth, only the hinge pins 135 are illustrated in FIG. 5 and the reference numerals of the hinge pins 136 are described together.

Upper ends of the inclined members 110 and 120 may be connected by the connection cable 140 to prevent the angle between the two inclined members 110 and 120 from being changed. The cable ties 141 and 142 are coupled to both ends of the connection cable 140, and the lugs 150 and 160 are coupled to the upper ends of the inclined members 110 and 120 to connect the cable ties 141 ( 142 and the connecting pins 143 and 144 penetrating through the lugs 150 and 160 (see FIG. 8). Since the connection structure of the rear cable tie 142 and the rear lug 160 is symmetrical with the connection structure of the front cable tie 141 and the front lug 150, the front cable tie 141 is illustrated in FIG. 8. ) And the connecting structure of the front lug 150 is shown and denoted by reference numerals.

The elevating mechanism 200 includes a jack base block 210 fixed to an upper surface of the bridge upper structure 10 and a hydraulic jack fixed to an upper surface of the jack base block 210. 220. The jack base block 210 is fixed to the bridge upper structure 10 by anchors or bolts and nuts 30. The jack base block 210 includes a base 211 seated on an upper surface of the bridge upper structure 10, a jack fixing plate 212 spaced upwardly from the base 211, and the base 211. ) And the jack fixing plate 212 are reinforced by a plurality of reinforcing ribs 213. The hydraulic jack 220 is the cylinder 221 is fixed to the upper surface of the jack base block 210 by a bolt and nut (not shown), the tower base block 130 on the top of the rod 222 ) Is seated. A plurality of guide posts 230 are vertically installed in the jack base block 210, and a guide hole through which the guide posts 230 pass through the tower base 130. 134 is formed so that the tower base 230 is guided in the vertical direction by the guide post 230. The tower support post 240 supporting the tower base block 130 is vertically installed in the jack base block 210. The tower support post 240 supports the tower base block 130 to maintain the tower base block 130 relative to the jack base block 210. A shim plate 250 is inserted between an upper end and the tower base block 130. The shim plate 250 is generally widely used to fill gaps between structures, and is formed of an iron plate having a “c” shape when viewed in a plan view, and is stacked alternately in front and rear (see FIGS. 4 to 4). 7).

The tension cable 300, 400 is a conventional twisted wire (鋼 撚 線) is used, the lower end of the tension cable tie 310, 410 for fixing to the upper surface of the bridge upper structure 10 is coupled At the upper end thereof, tension cable ties 320 and 420 are coupled to the upper ends of the inclined members 110 and 120 of the inclined tower 100 (see FIGS. 8 and 9).

In coupling the lower ends of the tension cables 300 and 400 to the bridge upper structure 10, the tension cable brackets 11 and 12 fixed to the bridge upper structure 10 and the tension cable 300 ( The tension cable ties 310 and 410 coupled to the bottom of the 400 are connected to the connecting pins 330 and 430 (see FIG. 9).

Since the connection structure of the rear tension cable bracket 12 and the rear tension cable 400 is symmetrical with the connection structure of the front tension cable bracket 11 and the front tension cable 300, in FIG. Only the connection structure of the tension cable bracket 11 and the front tension cable 300 is shown, and reference numerals are given together.

The upper ends of the tension cables 300 and 400 are tensioned with the lugs 150 and 160 coupled to the upper ends of the inclined members 110 and 120 in connection with the upper ends of the inclined members 110 and 120. The cable ties 320 and 420 are connected to the connection pins 340 and 440. The installation angle of the tension cable 300, 400 is installed to maintain the same angle as the installation angle of the tension cable in the conventional device. The installation angle of the tension cable 300, 400 is the length of the tension cable 300, 400 and the length and installation angle of the inclination members 110, 120 constituting the inclined tower 100, the bridge upper structure It is determined by the fixing position of the tension cable brackets 11 and 12 fixed to the upper surface of 10 (see FIG. 8 above).

Since the inclined members 110 and 120, the tension cables 300 and 400, the cable ties 320 and 420, and the connecting pins 340 and 440 are symmetrical with each other, the inclined members 110 and 120 are tensioned with the inclined members 110. Only the cable 300, the cable tie 320, and the connecting pin 340 are illustrated, and reference numerals of the inclined member 120, the tension cable 400, the cable tie 420, and the connecting pin 440 are described together.

Hereinafter, the construction process according to the v-shaped tower construction method for reducing the upper cross-sectional force of the bridge using the jack-up of the present invention.

[Preparation phase]

As shown in FIG. 11, the bridge upper structure 10 is fixed to the tension cable brackets 11 and 12 in advance on the upper surface thereof, and is prepared in a state in which the extrusion nose 13 is coupled to the front end in advance. .

The jack base block 210, the hydraulic jack 220, and the tower base block 130 are installed on the upper surface of the bridge upper structure 10.

The jack base block 210 is fixed to the bridge upper structure 10 by anchors or bolts and nuts 30 (see FIGS. 4 and 5).

The hydraulic jack 220 is installed in the jack base block 210. The hydraulic jack 220 fixes the flange (not shown) formed at the lower end of the cylinder 221 constituting the hydraulic jack 220 to the jack fixing plate 212 of the jack base block 210 by bolts and nuts. This is to use a conventional hydraulic cylinder fixing method, so a detailed illustration and description thereof will be omitted.

The base base block of the tower base block 130 is seated on an upper surface of the rod 222 of the hydraulic jack 220, and the tower base block is provided on the guide post 230 installed in the jack base block 210. The guide hole 134 formed in the base 131 of the 130 is fitted (see FIGS. 4 and 5).

As shown in FIG. 12, the lower ends of the inclined members 110 and 120 are connected to both front and rear sides of the hinge pieces 132 constituting the tower base block 130 by connecting pins 135 and 136. .

In this case, in order to prevent the inclined members 110 and 120 from moving forward and backward, the inclined members are installed by supporting the bridge upper structure 10 and the inclined members 110 and 120 with the props 170 and 180. Temporarily fix 110 and 120. The props 170 and 180 may be configured in the form of a turn buckle to adjust the length corresponding to the inclination angle of the inclined members 110 and 120.

In order to install the supports 170 and 180 between the bridge upper structure 10 and the inclined members 110 and 120, a bracket bracket (not shown) is provided on the bridge upper structure 10 and the inclined members 110 and 120. When installed) and the brace bracket installed on the lower end of the brace 170, 180 and the bridge upper structure 10 with a connecting pin (not shown), the top and the inclined member of the brace 170, 180 (110) 120 is connected to a connecting pin (not shown), and then it is preferable to be able to dismantle the braces 170, 180 after the installation of the tension cable 300, 400, bar in the drawing In this regard, a specific illustration is omitted.

The upper ends of the inclined members 110 and 120 are connected with the connection cable 140 so that the angles between the inclined members 110 and 120 do not vary randomly.

In connecting the upper ends of the inclined members 110 and 120 with the connection cable 140, the lugs 150 and 160 coupled to the upper ends of the inclined members 110 and 120 and the connection cables 140 are provided at both ends. The combined cable ties 141 and 142 are connected to the connecting pins 143 and 144 (see FIG. 8).

As shown in FIG. 13, the inclined tower 100 connects the lower ends of the tension cables 300 and 400 to the cable brackets 11 and 12 fixed to the upper surface of the bridge upper structure 10. The front and rear of the pair of inclined members 110, 120 connect the top of the tension cable 300, 400.

In connecting the lower ends of the tension cables 300, 400 and the tension cable brackets 11, 12, the tension cable ties 310, 410 coupled to the lower ends of the tension cables 300, 400 and the The tension cable brackets 11 and 12 are connected to the connecting pins 330 and 430 (see FIG. 9).

In connecting the top of the tension cable 300, 400 and the top of the front and rear pair of inclined members 110, 120, tension cable tie 320 coupled to the top of the tension cable 300, 400 The lugs 150 and 160 coupled to the top of the 420 and the front and rear pair of inclined members 110 and 120 are connected to the connection pins 340 and 440 (see FIG. 8).

At this time, the tension cable 300, 400 is composed of a pre-calculated length when connected to the bridge upper structure 10 and the inclined member 110, 120 between the inclined member 110, 120 Ensure that the angle is kept at the designed angle.

That is, as shown in FIG. 10, 1 of the height h of the temporary tower 1 using the top height H of the inclined members 110 and 120 of the inclined tower 100 in a conventional method. / 2, the distance (L) between the bridge upper structure 10 and the connection point of the tension cable 300, 400 is the same as in the conventional method, the tension cable 300, 400 and the bridge upper structure The angle? Made by the upper surface of (10) is made to be the same as the angle formed by the upper surface of the cable and the bridge upper structure in the conventional construction method.

As described above, in the present invention, the top height of the inclined tower 100 can be lowered to 1/2 of the height of the temporary tower of the conventional method, so that the influence of the wind load can be minimized as well as the inclined tower 100 and the tension cable. The unsupported distance of the 300 and 400 is short so that an economical member can be used.

Since the stability to the buckling of the inclined tower 100 is improved, it is possible to reduce the cross section of the inclined tower 100, thereby enabling economical construction. This advantage of the present invention is even greater in the case of high bridge bridge.

In addition, the height of the inclined tower 100 is easy to install, and the visual stability is high, the worker can perform a stable operation.

In this case, the tension cables 300 and 400 connected between the bridge upper structure 10 and the inclined tower 100 are free of tension.

When the connection of the tension cables 300 and 400 is completed, the inclined tower 100 is raised by operating the hydraulic jack 220 of the elevating mechanism 200 in the tension mode, so that the top of the bridge 10 structure 10 The tension cables 300 and 400 coupled between the front and rear ends of the interval and the upper end of the front and rear pairs of inclined members 110 and 120 are tensioned, and then the props that are supporting the inclined members 110 and 120 are supported. Disassemble the 170 and 180. The braces 170 and 180 are connected by brace brackets and connecting pins (not shown), and thus can be easily disassembled by simply removing the connecting pins.

[Extrusion Step of Bridge Top Structure]

The bridge upper structure 10 in which the inclined tower 100, the elevating mechanism 200, and the tension cables 300 and 400 are installed is extruded according to a predetermined condition by an extrusion device (not shown).

In the extrusion process, the bridge upper structure 10 includes a first section through which the inclined tower 100 passes through a point portion, that is, an upper portion of the bridge 20, and the inclined tower 100 passes through a central portion of the span. Pass the second section repeatedly.

[Tension phase of tension cable]

As shown in FIG. 14, when the bridge upper structure 10 passes through the first section, the tension cables 300 and 400 are tensioned to reduce the cross-sectional force generated in the bridge upper structure 10. .

That is, in the first section in which the inclined tower 100 passes through the point portion, the parent upper portion is generated in the bridge upper structure 10 at the position of the inclined tower 100, and the bridge upper structure 10 and the tension cable ( The positive moment is generated at the connection point position of the 300 and 400 bar. At this point, the tension moment is applied to the upper bridge structure 10 at the inclined tower 100 by tensioning the tension cables 300 and 400. To reduce the parent moment acting on the bridge upper structure 10 at the inclined tower 100 position, and to the bridge upper structure 10 at the connection point position of the bridge upper structure 10 and the tension cables 300 and 400. By generating the parent moment to reduce the static moment acting on the bridge upper structure 10 at the connection point of the bridge upper structure 10 and the tension cable 300, 400.

The tension of the tension cable 300, 400 is raised, as shown in Figure 14, by operating the hydraulic jack 220 in the tension mode, the inclined tower 100 is raised and the tension cable 300, 400 It is to make this nervous.

That is, when the hydraulic jack 220 is operated in the tension mode, the rod 222 is raised, the tower base block 130 seated on the upper surface of the rod 222 is raised, the tower base block The lower end is connected to the inclined members 110 and 120 connected to the 130, and thus the lower end is connected to the upper structure of the bridge 10 and the upper end of the inclined members 110 and 120. The connected tension cables 300 and 400 are tensioned.

At this time, since the upper end of the inclined members 110 and 120 is connected by the connection cable 140, the angle variation between the inclined members 110 and 120 does not occur.

In the process of raising the tower base block 130 of the inclined tower 100 by the hydraulic jack 220, the tower base block 130 and the guide post 230 provided in the jack base block 210; It is provided in the tower base block 130 is guided by the guide ball 134 inserted into the guide post 230 to rise in the vertical direction.

After the inclined tower 100 is raised by the hydraulic jack 220, the shim plate 250 is formed between the base 131 of the tower base block 130 and the tower support post 240 of the jack base block 210. Insert it.

The shim plate 250 is formed of an iron plate forming a "c" shape, and is alternately inserted at the front and rear sides thereof so that its total height is supported by the base 131 of the tower base block 130 and the jack base block 210. Laminate by the interval between the posts 240.

When the insertion and lamination of the shim plate 250 is completed, the raised state of the inclined tower 100 and the tension state of the tension cables 300 and 400 are maintained as they are without applying hydraulic pressure to the hydraulic jack 220.

[Steps to Preparing to Stop Extrusion and Tension Cable Relaxation]

As shown in FIG. 15, when the tip of the extrusion nose 13 is extruded to the point of the planned pier 20, that is, when the inclined tower 100 passes the center portion of the span, extrusion is performed. In operation, the shim plate 250 that is inserted between the base 131 of the tower base block 130 and the tower support post 240 of the jack base block 210 is removed.

[Tension cable relaxation phase]

As shown in FIG. 16, when the bridge upper structure 10 passes through the second section, the tension cables 300 and 400 are relaxed to reduce the cross-sectional force generated in the bridge upper structure 10. .

That is, when the tip end of the extrusion nose 13 is extruded to the point portion of the bridge 20, the slope tower 100 reaches the second section passing through the center portion of the span, the interval of the bridge upper structure 10 The moment is generated in the center portion, the parent moment occurs at the connection point position of the bridge upper structure 10 and the tension cable 300, 400, at this point relax the tension cable (300, 400) By generating a parent moment in the bridge upper structure 10 at the center portion of the trunk to reduce the static moment generated in the bridge upper structure 10 at the center portion of the trunk, and the bridge upper structure 10 and the tension cable ( 300 and 400 to generate a constant moment in the upper bridge structure 10 at the connection point position generated in the upper bridge structure 10 at the connection point position of the bridge upper structure 10 and the tension cable (300) (400) Reduce parent Will.

As shown in FIG. 15, the relaxation of the tension cables 300 and 400 is performed by operating the hydraulic jack 220 in a relaxation mode so that the inclined tower 100 descends and the tension cables 300 and 400. This is to relax.

That is, when the hydraulic jack 220 is operated in the relaxation mode, the rod 222 is lowered, and the tower base block 130 seated on the upper surface of the rod 222 is lowered, and the tower base block The lower end is connected to the 130 is inclined member 110, 120 is lowered, so that the lower end is connected to the bridge upper structure 10 and the upper end of the inclined member 110, 120 The connected tension cables 300 and 400 are relaxed.

At this time, since the upper end of the inclined members 110 and 120 is connected by the connection cable 140, the angle variation between the inclined members 110 and 120 does not occur.

In the process of descending the tower base block 130 of the inclined tower 100 by the hydraulic jack 220, the tower base block 130 and the guide post 230 provided in the jack base block 210 and It is provided in the tower base block 130 and guided by the guide ball 134 fitted to the guide post 230 is lowered in the vertical direction.

As described above, in order to tension or relax the tension cables 300 and 400, each lifting cable 300 and 400 is not tensioned or relaxed by each tension device, but one lifting mechanism 200. By simply elevating the inclined tower 100, all the tension cables 300, 400 can be tensioned or relaxed, so that the operation is easy and there is no need to add a separate process. In addition, economical construction is possible without the need for additional tension equipment.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments and drawings, It will be understood that various modifications may be made by those skilled in the art.

10: bridge upper structure 20: bridge
100: inclined tower 110, 120: inclined member
130: tower base block 140: connection cable
200: lifting mechanism 210: jack base block
220: hydraulic jack 230: guide post
240: tower support post 250: shim plate
300, 400: tension cable

Claims (7)

An inclined tower 100 having a lower end positioned on an upper surface of the bridge upper structure 10 and configured to have a "V" shape spreading in the front-rear direction while moving upward; An elevating mechanism (200) installed between an upper surface of the bridge upper structure (10) and a lower portion of the inclined tower (100) to elevate the inclined tower (100); Tension cables 300 and 400 are connected between the front and rear of the bridge upper structure 10 and the front and rear upper ends of the inclined tower 100,
The lifting mechanism 200 is
It comprises a jack base block 210 is fixed to the center of the upper surface of the upper section of the bridge upper structure 10, and a hydraulic jack 220 is fixed to the upper surface of the jack base block 210,
The inclined tower 100 is
A tower base block 130 seated on an upper portion of the elevating mechanism 200;
The front and rear portions of the tower base block 130, the lower end of each of which is supported in a forward and backward direction, respectively, and the front and rear a pair of inclined members 110 and 120 are installed to be inclined forward and backward, respectively, and the front and rear V-shaped tower construction apparatus for reducing the upper cross-sectional strength of the bridge using the jackup, characterized in that it comprises a connecting cable 140 for connecting the upper end of the pair of inclined members (110) (120).
delete The method of claim 1,
The jack base block 210 is provided with a plurality of guide posts 230, and the tower base block 130 is provided with a guide hole 134 corresponding to the guide post 230. V-type tower temporary device for reducing cross section force on the upper part of bridge.
The method of claim 1,
The jack base block 210 includes a tower support post 240, and a plurality of shim plates 250 inserted and stacked between an upper end of the tower support post 240 and a lower surface of the tower base block 130. V-type tower construction apparatus for reducing the upper cross-sectional force of the bridge using the jackup, characterized in that it further comprises.
The method of claim 1,
Lugs 150 and 160 coupled to the front and rear upper ends of the elevating tower 100,
Cable brackets 11 and 12 fixed to the front and rear ends of the bridge upper structure 10,
Further comprising a cable tie 310, 320 and cable ties 410, 420 are respectively coupled to the upper and lower ends of the tension cable 300, 400,
The cable ties 310 and 410 coupled to the lower ends of the tension cables 300 and 400 and the cable brackets 11 and 12 are connected to the connection pins 330 and 430.
Cable tie 320, 420 and the lug 150, 160 coupled to the upper end of the tension cable 300, 400 and the bridge using a jack-up, characterized in that connected by the connecting pins (340, 440) V tower construction device for reducing upper sectional force.
The elevating mechanism 200 is installed on the upper surface of the bridge upper structure 10, and has a pair of front and rear inclined members 110 and 120 extending upwardly and upwardly on top of the elevating mechanism 200, respectively. Installing an inclined tower (100) and connecting the front and rear of the bridge upper structure (10) and the top of the inclined tower (100) with tension cables (300) (400);
The upper structure of the bridge 10 by the extrusion device, the parent is generated in the bridge upper structure 10 at the position of the inclined tower 100 and the bridge upper structure 10 and the tension cable (300, 400) A first section in which a constant moment occurs in the upper bridge structure 10 at the connection point position of the bridge, and a constant moment occurs in the bridge upper structure 10 at the position of the inclined tower 100 and the bridge upper structure ( 10) repeatedly extruding the second section in which the parent moment occurs in the bridge upper structure (10) at the connection point position of the tension cable (300) (400);
By raising the inclined tower 100 by the elevating mechanism 200 in the first section to tension the tension cable 300, 400 to reduce the parent and static moment of the upper bridge structure 10 step;
In the second section, the inclined tower 100 is lowered by the elevating mechanism 200 to relax the tension cables 300 and 400 so that the static moments and the parent moments generated in the upper structure structure 10 of the bridges 10. Reducing; Including,
The lifting mechanism 200 is
It comprises a jack base block 210 is fixed to the center of the upper surface of the upper section of the bridge upper structure 10, and a hydraulic jack 220 is fixed to the upper surface of the jack base block 210,
The inclined tower 100 is
A tower base block 130 seated on an upper portion of the elevating mechanism 200;
The front and rear portions of the tower base block 130, the lower end of each of which is supported in a forward and backward direction, respectively, and the front and rear a pair of inclined members 110 and 120 are installed to be inclined forward and backward, respectively, and the front and rear By including a connecting cable 140 for connecting the upper end of the pair of inclined members 110, 120
In the first section, the inclined tower 100 is raised by the elevating mechanism 200 to tension the tension cables 300 and 400, and then between the jack base block 210 and the tower base block 130. V-shaped tower construction method for reducing the cross-sectional force of the upper portion of the bridge using a jack-up, characterized in that the plurality of shim plates (250) inserted into the stack. delete

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