KR20070111083A - Adjusting apparatus of the load carrying capacity for girders and its method - Google Patents

Abstract

An apparatus and a method for adjusting load carrying capacity of girders are provided to adjust a placed shape of a steel wire, and to change upward force through the steel wire by changing the position of adjustable saddles for supporting the steel wire. An apparatus for adjusting load carrying capacity of box shaped girders(G) comprises a steel wire(L), and at least one adjustable saddle. The steel wire is horizontally installed to be fixed to two ends of the girder. The adjustable saddle is vertically installed to connect upper and lower ends of the girder to change a placed shape of the steel wire and to increase the load carrying capacity of the girder. The adjustable saddle is a screw shaped saddle device(10) for moving the steel wire upwards and downwards according to the rotation of a moving rod.

Description

Load-bearing device and method of girder {ADJUSTING APPARATUS OF THE LOAD CARRYING CAPACITY FOR GIRDERS AND ITS METHOD}

1 is a configuration diagram showing a tension adjusting device of a typical girder,

2a and 2b is a front view showing only the main part and a configuration diagram showing the upper screw-type saddle device installed in the girder according to the present invention,

3a and 3b is a front view showing only the main part and a configuration diagram showing the lower screw-type saddle device installed in the girder according to the present invention,

4a and 4b is a configuration diagram showing a hydraulic jack pressure adjustable saddle device installed in the girder according to the present invention and a front view showing only the main part thereof,

5a and 5b is a schematic view showing a screw jack pressure regulating saddle device installed in the girder according to the present invention and a front view showing only the main portion thereof

5C is a side view illustrating the screw jack applied to FIG. 5B.

<Explanation of symbols on main parts of the drawings>

2a, 2b: fixed end 10: upper screw type saddle device

12a: fixed cylinder 12b: induction cylinder

14: moving rod 16a: upper rotary part

16b: lower rotating part 18: moving cylinder

18a: saddle 19: anti-rotation means

19a: anti-rotation plate 19b: guide guide

G: Girder L: Steel Wire

The present invention relates to a device for adjusting the load capacity of a girder for supporting an external load, and in particular, to adjust the configuration of the steel wire by varying the position of the saddle supporting the steel wire to change the upward force by the steel wire to increase the load capacity of the structure. It relates to a load-bearing device of the girder for easy adjustment and a method thereof.

In general, bridges are subjected to various loads during the bridge fabrication stage due to the manufacture and mounting of girders, placing and curing of the upper slabs, and vehicle loads. This will vary.

Of course, in order to design the structure safely, the size of the girder is determined based on the bridge fabrication stage and the specific position during the stress change process as described above. Most of them fall short, which is an uneconomical design where the size of the girders becomes larger than necessary.

To solve this problem, the steel wire is placed in the girder to cancel the load by applying tension, or in the case of concrete girder, to induce compressive stress on the shear surface of the girder to compensate for the significantly smaller tensile strength than the compressive strength. Therefore, prestress girders have been developed that can efficiently use materials.

More specifically, since the prestress girder may initially apply only the primary tension to the merchant ship, it is difficult to provide an optimum design for various loads because only one stress correction is possible in the manufacturing stage of the bridge.

Recently, prestress girders have been developed to perform stress compensation several times during the fabrication phase of bridges by varying the tension of the wires through retension of the wires.

Specifically, as shown in FIG. 1, fixed ends 2a and 2b are formed at both ends of the girder G, and the first and second steel wires L1 and L2 are disposed between the fixed ends 2a and 2b. ) Are connected to each other, but the secondary steel wire (L2) is connected to each other by a coupler (4) so that the middle is cut to adjust the length, the second steel wire (L1, L2) in the coupler (4) ), Such devices are already disclosed in Korean Patent Laid-Open Nos. 20001-0036486, 10-0402367, 10-0349880, 10-10380637, 10-03011431, and 10-0456471. It is described.

Of course, a separate device for tensioning the secondary steel wire is required, and the work after the mounting of the girder is carried out between the end of the continuous girder on the pier, between the end and the girder end, or a separate device to approach the bottom of the bridge. Since it is difficult to secure a working space because it must be installed, there is a problem that the risk of work is large, and precise construction is difficult in a weak working environment because the tension of the steel wire should be set relatively large.

The present invention has been made to solve the above-described problems of the prior art, and does not apply a separate tension force to the steel wire, as well as easily change the upward force of the girder by changing the position of the birds to facilitate the working conditions It is an object of the present invention to provide a device and a method for adjusting the load capacity of a girder capable of precise construction.

Load capacity adjusting device of the girder according to the present invention for solving the above problems is installed in the longitudinal direction to connect the box-shaped girder, the steel wire installed in the transverse direction so as to be fixed to both ends of the girder, and the upper and lower ends of the girder of the steel wire And at least one adjustable saddle device that enhances the load capacity of the girder by varying the configuration.

The load-bearing adjustment method of the girder according to the present invention comprises the step of adjusting at least one portion of the steel wire fixed to both ends of the girder in the vertical direction to adjust the arrangement of the steel wire.

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

2a and 2b is a schematic view showing a top screw-type saddle device installed in the girder according to the present invention and only the main part thereof.

The upper screw-type saddle device according to the invention can be installed in any position of the box-shaped girders (G) or I-beams, as shown in Figure 2a and 2b, fixed ends formed on both ends of the girder (G) Steel wire (L) is fixed in the transverse direction to (2a, 2b), only one upper screw-shaped saddle device 10 is fixed in the longitudinal direction in the center of the girder (G), or in the transverse direction of the girder (G) At least two upper screw-type saddle devices 10 may be fixed in a longitudinal direction at intervals.

More specifically, the upper screw-shaped saddle device 10 is the upper and lower ends of the movable rod 14 is formed on the outer circumferential surface between the fixed cylinder 12a and the guide cylinder 12b fixed to the upper and lower ends of the girder G, respectively. It is installed to engage, the upper and central portions of the movable rod 14, the upper rotary portion 16a and the intermediate rotary portion 16b for rotating the movable rod 14 are formed integrally, the middle of the movable rod 14 Between the rotating part 16b and the induction cylinder 12b, it is comprised so that the saddle 18a which may be integrated with the moving cylinder 18 and the said steel wire L may be installed may be provided.

Here, the fixed cylinder 12a is fixed to the upper end of one side of the girder G, and a female thread is formed inside thereof so as to be engaged with the upper end of the movable rod 14, whereas the induction cylinder 12b ) Is fixed to one side lower end of the girder (G), it is installed in the inner side so that the lower end of the movable rod 14 is rotatably supported by a bearing or the like, for example.

Of course, the fixed cylinder 12a and the guide cylinder 12b are preferably located in a straight line in the transverse direction of the girder G, and the guide cylinder 12b may be omitted.

Next, the movable rod 14 is divided into upper and lower portions 14a and 14b around the intermediate rotating part 16b, and threads of opposite directions are formed at the upper portion 14a of the movable rod and the lower portion 14b of the movable rod. .

At this time, the upper portion (14a) of the movable rod is installed so that the upper rotating portion (16a) is integrally fixed to the upper end, and the fixed cylinder (12a) is engaged to the lower side, while the lower portion (14b) of the movable rod is The induction cylinder 12b is installed at the lower end to be engaged, and the moving cylinder 18 is installed at the upper side thereof.

Of course, the movable rod 14 rotates about the fixed cylinder 12a and the guide cylinder 12b and the movable cylinder 18, so that the movable cylinder 18 moves up and down along the movable rod 14. Will move.

Next, the upper rotating portion 16a is integrally formed to protrude radially on the upper end of the movable rod 14, while the intermediate rotating portion 16b also protrudes radially between the upper and lower portions 14a and 14b of the movable rod. It is formed integrally so that, in addition to the lower rotating portion (not shown) may be further installed.

At this time, the upper rotating portion 16a and the lower rotating portion 16b is formed in a hexagonal screw head shape, but may be formed in a variety of polygons, to be rotated by being engaged by a separate tool, the movable rod 14 To rotate together.

Next, the moving cylinder 18 is a kind of cylinder shape to be engaged with the moving rod 14, and a female thread is formed therein, and the saddle 18a is attached to be integrated with the moving rod 14 so that the steel wire L can be penetrated and supported. do.

At this time, the movable cylinder 18 is installed on the upper portion 14a of the movable rod between the fixed cylinder 12a and the intermediate rotary part 16b, even if the movable rod 14 is rotated, the movable cylinder 18 is The steel wire L is not rotated so as to cross, and the moving rod 18 is rotated with respect to the moving cylinder 18, and the moving cylinder 18 is configured to move only in the vertical direction.

Nevertheless, the moving cylinder 18 and the moving cylinder 18 together with the steel wire L to suppress the rotational force acting in the circumferential direction by the rotational force of the moving rod 14 and to prevent it from being rotated. The rotation preventing means 19 is installed between the girder G.

Specifically, the rotation preventing means 19 is configured such that the moving cylinder 18 is restrained to be movable only in the up and down direction of the girder G, so that the moving cylinder 18 does not interfere with the saddle 18a. Rotation plate (19a) protruding integrally in both directions on the back of the) and the guide plate (19b) fixed to the girder (G) so that the rotation plate (19a) can be inserted and moved in the vertical direction The anti-rotation plate 19a and the guide guide 19b may be formed on one side of the girder G.

Of course, it is preferable that the induction guide 19b is fixedly installed at a predetermined interval so that the anti-rotation plate 19a can be inserted into the side of the girder G in a plate shape.

In addition, the anti-rotation means 19 is the end of the anti-rotation plate (19a) is bent to form an end, the induction guide (19b) in the shape of a long groove in the transverse direction on the side of the girder (G) It may be configured to be formed, and thus the end of the anti-rotation plate (19a) may be inserted into the induction guide (19b) may be configured in various ways to prevent rotation.

Looking at the operating state of the upper screw-shaped saddle device 10 configured as described above, the steel wire (L) is fixed to connect both ends of the girder (G), the middle portion of the steel wire (L) is the saddle (18a) The upper screw-shaped saddle device 10 is installed in the longitudinal direction of the girder G to be installed to span ().

At this time, the user rotates the upper rotary part 16a in one direction through a separate tool at the top of the girder G, or enters the girder G to move the intermediate rotary part 16b through a separate tool. The moving rod 14 may be rotated between the fixed cylinder 12a and the guide cylinder 12b as the upper rotary part 16a or the intermediate rotary part 16b is rotated.

Of course, as the movable rod 14 is rotated, the movable cylinder 18 which is screwed with each other also receives a rotational force, and the anti-rotation plate 19a integrally formed with the movable cylinder 18 is the induction guide 19b. By moving only in the up and down direction along), the moving cylinder 18 is moved downward along the moving rod 14 in the direction of the induction cylinder 12b.

Accordingly, the gap between the fixed cylinder 12a and the moving cylinder 18 is narrowed, and at the same time the saddle 18a pushes the steel wire L downward to generate an upward force on the girder G. As a result, even if various loads are applied to the girder G, the upward force can be adjusted at any time.

3a and 3b is a schematic view showing the lower screw-type saddle device installed in the girder according to the present invention and only the main part thereof.

Lower screw-type saddle device according to the present invention, as shown in Figure 3a and 3b, the induction cylinder 22a, the fixed cylinder 22b, the moving rod 24, the upper rotary portion 26a, the intermediate rotary portion 26b, the movement Since the cylinder 28 and the saddle 28a and the rotation preventing means 29 are configured in the same manner as the upper screw-type saddle device 10, detailed description of each component will be omitted.

However, the induction cylinder 22a is fixed to the upper end of the girder G so as to rotatably support the upper end of the movable rod 24, while the fixed cylinder 22b is fixed to the lower end of the girder G. And the lower end thread of the movable rod 24 and the female thread of the inner circumferential surface thereof are engaged with each other so that the movable rod 24 is rotatable between the guide cylinder 22a and the fixed cylinder 22b.

In addition, the movable rod 24 is divided so that the upper and lower portions 24a and 24b have threads formed in different directions about the intermediate rotating part 26b, and the movable cylinder 28 is intermediate with the induction cylinder 22b. It is installed to engage the upper portion (24a) of the movable rod between the rotating portion (26b).

Therefore, looking at the operating state of the lower screw-type saddle device 20 configured as described above, as the movable rod 24 is rotated, the movable cylinder 28 is moved downward, the fixed cylinder 22b and the movable cylinder The spacing between the 28 is narrowed and at the same time the saddle 28a pushes the steel wire L downward so that the upward force acts on the girder G.

Figures 4a and 4b is a schematic view showing a hydraulic jack pressure adjustable saddle device installed in the girder according to the present invention and only the main part thereof is a front view.

The hydraulic jack pressure adjustment saddle device according to the present invention has a moving rod 34 in the longitudinal direction between the hydraulic jack 32a and the induction cylinder 32b fixed to the upper and lower ends of the girder G as shown in FIGS. 4A and 4B. Is installed, is connected to the hydraulic jack (32a) on one side of the girder (G) is provided with a pressurizer 36 for transmitting the hydraulic pressure to the hydraulic jack (32a), the movable rod (34) is connected to the hydraulic jack (32a) In accordance with the operation of the hydraulic jack (32a) is provided with a moving cylinder 38 that moves along the moving rod (34).

Of course, the steel wire (L) is installed in the transverse direction between the fixed ends (2a, 2b) provided at both ends of the girder (G), the hydraulic jack pressure adjustable saddle device 30 is the steel wire (L) It is installed in the longitudinal direction so as to be integrated with the moving cylinder 38 is installed so that the steel wire (L) over the saddle (38a) extended to both sides.

Here, the movable rod 34 is passed through the moving cylinder 38 at the upper end thereof, while a thread is formed at the lower end thereof so as to be fixedly engaged with the induction cylinder 32b, or integrated with the induction cylinder 32b. It is manufactured and installed as a single part, and guides the moving cylinder 38 to move only up and down.

At this time, the hydraulic jack 32a is fixed to the upper end of one side of the girder G, the upper end thereof is connected to the pressurizer 36 and the lower end thereof is installed to be connected to the moving cylinder 38, and the movement The cylinder 38 is installed to be movable in the vertical direction to the movable rod 34, a spring (not shown) for imparting a separate restoring elastic force is installed between the movable cylinder 38 and the movable rod 34. desirable.

 Of course, the hydraulic jack 36 is connected to the moving cylinder 38 is configured to move the moving cylinder 38 in the vertical direction, in this case, the moving cylinder 38 is rotated relative to the moving rod (34) Even if the rotation preventing means 39 is installed so that it can be moved only in the vertical direction, the rotation preventing means 39 is made of a rotation preventing plate 39a and induction guide 39b as applied to the other embodiments of the above The detailed description will be omitted.

Therefore, when looking at the operating state of the hydraulic jack pressure control type saddle device 30 configured as described above, when the pressure from the pressurizer 36 to the hydraulic jack 36, the moving cylinder 38 by the hydraulic jack 36 Is moved downward along the movable rod 34, and the gap between the upper end of the girder G and the moving cylinder 38 is farther apart, while the saddle 18a pushes the steel wire L downward. Let upward force act on (G).

Figures 5a and 5b is a front view showing a configuration diagram showing only the main portion and the screw jack pressure regulating saddle device installed in the girder according to the present invention, Figure 5c is a side view showing the screw jack applied to Figure 5b.

The screw jack pressure regulating saddle device according to the present invention has an induction cylinder 42, a moving rod 44, a screw jack 46, a moving cylinder 48 and a saddle 48a, as shown in FIGS. 5A and 5B. Since the anti-rotation means 49 is configured in the same manner as the hydraulic jack pressure regulating saddle device 30, a detailed description of each component will be omitted.

However, in the hydraulic jack pressure control saddle device 30, the hydraulic jack 32a is fixed to the upper end of the girder G and connected to the moving cylinder 38, while the screw jack pressure control saddle device 40 ) Is installed so that the screw jack 46 is fixed to the upper end of the girder G and connected to the upper side of the moving cylinder 48 so that the moving cylinder 48 is operated according to the operation of the screw jack 46. The movable rod 44 may be installed to be movable in the vertical direction, and a spring (not shown) may be installed between the movable cylinder 48 and the movable rod 44 to impart a separate restoring elastic force.

In addition, even if the movable cylinder 48 is rotated with respect to the movable rod 44, the rotation preventing means 49 consisting of a rotation preventing plate 39a and an induction guide 39b can be installed so as to be movable only in the up and down direction. The anti-rotation means 39 is the same as that applied to the other embodiments, and thus detailed description thereof will be omitted.

In particular, the screw jack 46 is a pair of horizontal cylinders (46a, 46a '), rotary rods (46b, 46b') and the rotating portion (46c, 46c) installed in the horizontal direction spaced apart as shown in Figure 5c '), A pair of blocks 46d, 46d' provided at intervals in the longitudinal direction, and four trusses 46e connecting various components to each other.

In more detail, the rotary rods 46b and 46b 'are installed in the transverse direction so that threads in different directions are formed on the outer circumferential surface of the intermediate portion, and the main head 46c having a screw head shape is integrally formed at the front end thereof. At the same time, the auxiliary rotating part 46c 'having a screw head shape is integrally formed at the middle part thereof, and the main rotating part 46c and the auxiliary rotating part 46c' are formed in various shapes so as to be rotated by a separate tool. Can be.

At this time, the horizontal movement cylinders (46a, 46a ') is formed with a female thread on the inner circumferential surface to engage both ends of the rotary rods (46b, 46b'), the blocks 46d, 46d 'are the rotary rods (46b, 46b) Are positioned at intervals above and below, and the trusses 46e are hinged to each other to connect the horizontal cylinders 46a and 46a 'and the blocks 46d and 46d' in a quadrangular shape. As the horizontal cylinders 46a and 46a 'are moved laterally, a force is transmitted to move the blocks 46d and 46d' in the longitudinal direction.

Of course, the screw jack 46 is the upper block 46d is fixed to the upper end of one side of the girder (G) to transfer the pressure to the moving cylinder 48, the lower block 46d is moved It is installed to connect with the cylinder 48.

Therefore, looking at the operating state of the screw jack pressure adjustment saddle device 40 configured as described above, the user can rotate the main rotary part 46c or the auxiliary rotary part 46c 'in one direction by using a separate tool. Accordingly, the horizontal movement cylinders 46a and 46a 'are collected toward the middle portion of the rotary rods 46c and 46c' and at the same time a force is transmitted through the trusses 46e to provide the blocks 46d and 46d. ') Moves up and down.

At this time, as the lower block 46d is connected to the moving cylinder 48, the moving cylinder 48 is moved downward along the moving rod 44 in the direction of the induction cylinder 42.

Therefore, the gap between the upper end of the girder G and the moving cylinder 38 is far away and at the same time the saddle 48a pushes the steel wire L downward to generate an upward force on the girder G, As a result, even if various loads are applied to the girder G, the upward force can be adjusted at any time.

Load capacity adjusting devices such as the upper screw saddle device 10, the lower screw saddle device 20, the hydraulic jack pressure control saddle device 30, the screw jack pressure control saddle device 40 is the steel wire ( One may be installed in the middle part of L), but in addition, a plurality may be installed in pairs at points symmetrical to both sides of the steel wire L, and only one type of load-bearing device may be installed, but in various forms. The load capacity adjusting device may be installed to be mixed, but in any case, by changing a configuration of the steel wire L while moving a portion of the steel wire L in the vertical direction, as mentioned above, the girder L The load capacity of) can be adjusted.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

Load-bearing device and method of the girder according to the present invention is configured as described above is installed steel wire in the transverse direction of the girder at the same time the upper screw type saddle device, lower screw type saddle device, hydraulic jack pressure adjustment saddle in the longitudinal direction of the girder Load-bearing device such as device and screw jack pressure saddle device is installed to span the steel wire, so even if various loads are applied and sagging occurs, the load-bearing device is adjusted by changing the shape of the steel wire. By generating an upward force on the beam, there is an advantage that the deflection of the girder can be more easily compensated.

In addition, the load-bearing device and method of the girder according to the present invention is a load-bearing device, such as the upper screw-type saddle device, the lower screw-type saddle device, the hydraulic jack pressure control saddle device and the screw jack pressure control saddle device installed directly on the girder Since the device can adjust its operation at the top of the girders or inside the girders, there is an advantage that safer calibration can be performed.

Claims (15)

With box girders, A steel wire installed transversely to be fixed to both ends of the girder, Device for adjusting the load capacity of the girder is installed in the longitudinal direction to connect the upper and lower ends of the girder comprises at least one adjustable saddle to increase the load capacity of the girder by varying the arrangement of the steel wire. The method of claim 1, The adjustable saddle is a load-bearing device of girder, characterized in that the screw-shaped saddle device for moving the steel wire in the vertical direction as the movable rod installed in the longitudinal direction is rotated. The method of claim 2, The screw-shaped saddle device is a support cylinder fixed to at least one or more of the upper and lower ends of the girder, a moving rod that is constrained to be rotatable to the support cylinder and has a screw thread formed in the middle portion thereof, and is formed on one side of the moving rod to separate tools. Rotating portion that can be rotated by, and is installed to be engaged with the middle portion of the moving rod and the steel wire is locked to the moving rod and the moving rod in the axial direction of the moving rod as the movable rod is rotated, characterized in that made Load-bearing device of girder. The method of claim 3, wherein The support cylinder is fixed to one of the upper and lower ends of the girder load capacity adjusting device of the girder, characterized in that the fixed cylinder formed with female acid so that one end of the movable rod is engaged. The method of claim 4, wherein The support cylinder is fixed to the other one of the upper and lower ends of the girder load capacity control apparatus of the girder, characterized in that it further comprises an induction cylinder rotatably supported by the other end of the moving rod. The method of claim 5, The rotating unit is a load-bearing device of the girder, characterized in that the screw head shape integrally formed on the upper end of the moving rod. The method of claim 6, The rotating unit is a load-bearing device of the girder, characterized in that the screw head shape integrally formed in the middle portion of the moving rod between the fixed cylinder and the moving cylinder. The method of claim 7, wherein The moving rod is a load capacity control device of the girder, characterized in that the thread direction is formed differently in the vertical direction based on the rotating part. The method of claim 1, The adjustable saddle is a load-bearing device of the girder, characterized in that the pressure adjustment saddle device for moving the steel wire in the vertical direction as the pressure is applied. The method of claim 9, The pressure regulating saddle device is a support cylinder fixed to one of the upper and lower ends of the girder, a hydraulic jack fixed to the other one of the upper and lower ends of the girder, a moving rod installed between the support cylinder and the hydraulic jack, and installed to be connected to the hydraulic jack And a pressurizer for transmitting hydraulic pressure to the hydraulic jack, and a moving cylinder and saddle which are engaged with the movable rod to be connected to the hydraulic jack and at the same time as the steel wire is locked to move in the axial direction of the movable rod according to the operation of the hydraulic jack. Load capacity adjusting device of the girder, characterized in that the hydraulic jack pressure adjustment saddle device made. The method of claim 9, The pressure-controlled saddle device is a support cylinder fixed to one of the upper and lower ends of the girder, a screw jack is fixed to the other of the upper and lower ends of the girder to apply pressure in the vertical direction while rotating the rod installed in the transverse direction, and the support A movable rod installed between the cylinder and the screw jack, and a movable cylinder and a saddle which are engaged with the movable rod so as to be connected to the screw jack and at the same time that the steel wire is caught and moved in the axial direction of the movable rod according to the operation of the screw jack. Load-bearing device of the girder, characterized in that the screw jack pressure adjustment saddle device made. The method of claim 11, The screw jack is a pair of horizontal movable cylinders installed at a predetermined interval in the transverse direction, the rotary rods are installed so that both ends are engaged between the horizontal movable cylinders, the threaded rod formed in the opposite direction relative to the middle portion, and the The horizontal portion is formed on one side and can be rotated by a separate tool, a pair of blocks installed at regular intervals in the longitudinal direction, and the horizontal rod cylinder and the connection between the horizontal bar as the rotating rod is rotated as the horizontal The load capacity control device of the girder, characterized in that the four cylinders are made to move the cylinders in the transverse direction and at the same time move the blocks in the longitudinal direction. And adjusting the arrangement of the steel wires by pushing at least one portion of the steel wires fixed to both ends of the girder in the vertical direction. The method of claim 13, Load capacity control method of the girder, characterized in that for pushing the middle portion of the steel wire in the vertical direction. The method of claim 13, Load capacity control method of the girder, characterized in that for pushing the parts symmetrical to both sides of the steel wire in the vertical direction.

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