KR101492078B1 - Construction method for temporary bridge using prestressed girder - Google Patents

Abstract

The present invention relates to a construction method of a temporary bridge improving the easiness, safety, and speed of a construction by using a transversally prestressed girder for the construction of an upper structure of a temporary bridge. An embodiment of the construction method of a temporary bridge includes; a step of manufacturing a girder by applying transversally symmetric prestress (a); a step of simply attaching the girder on the upper sides of temporary bents for allowing prestress to be applied to generate an upside camber in the transverse direction from the center of the lengthwise direction of the girder; and a step of installing lining plates on the girder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a temporary bridge using a prestressed girder member,

The present invention relates to a method of constructing a temporary bridge, and more particularly, to a method of constructing a temporary bridge by using a girder member manufactured with a prestress introduced in the transverse direction of the upper structure of a temporary bridge to secure ease of construction, safety, The present invention relates to a method of constructing a bridge.

Hybrid bridges are constructed for the purpose of preventing obstacles to traffic to existing lower roads when building a new overpass, or securing a work space at the upper part of a river when constructing bridges crossing rivers.

These temporary bridges are temporary structures that are constructed in order to smoothly carry out the construction of the main structure and are removed after the completion of the construction of the main structure. Therefore, it should be constructed quickly so as not to affect the construction progress of the main structure, In addition, the construction cost of the hypothetical bridge should not be a large part of the total construction cost.

Recently, the development of construction technology has enabled the construction of very large bridges. The air has been increased in proportion to the size of the bridges, and the duration of the bridges has also increased. As a result, the structural stability of the hypothetical bridge, which affects the safety of workers and the workability of the structure, becomes more important.

Registration No. 10-0980067 " Hybrid bridges and method of construction using a flat plate installed so as to be in contact with each other in the longitudinal direction on a horizontal beam ", improves the rigidity of the flat plate directly contacting with the work space, So as to secure the structural stability of the temporary bridge by preventing the slip plate from being detached from the girder and the like. In addition, in the case of "a bridge with integral plate and girder" in Registration No. 10-0739823, the bridge plate is integrally joined with the girder along the longitudinal direction of the girder so that the bridge plate plays a role not only in constituting the bottom surface of the work space but also in a structural role , Another prior art registration No. 10-0547484, 'Hybrid Bridges Constructed by Bridging H beams, Prestressed Bridge Girders, Fall Protection Devices and Multi-Point Support Devices and Their Installation Method' And the structural stiffness of the hypothetical bridge is increased.

However, although the above-described conventional techniques may be useful in improving the structural rigidity of a temporary bridge, the construction may be complicated due to the complexity of the construction, and it may be difficult to manufacture the complex member and increase the amount of steel, .

KR 10-0980067 B1 KR 10-0739823 B1 KR 10-0547484 B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to improve the structural performance of a temporary bridge by using a girder member manufactured with a prestress introduced in a transverse direction Another object of the present invention is to provide a method of constructing a temporary bridge using a prestressed girder member capable of ensuring ease of installation, safety, promptness and economical efficiency.

According to a preferred embodiment of the present invention to solve the above-mentioned problems, there is provided a method of manufacturing a main girder, comprising: a) a pair of main girders each having a curved shape in the longitudinal direction and spaced apart in parallel so that concave portions face each other, A support member disposed at both ends in the longitudinal direction at right angles to the main girder and a prestressing member arranged at a right angle to the main girder at a longitudinally central portion of the main girder; The support members are provided such that both ends of the support members are in contact with the main girder on the center height of the cross section of the main girder while the both ends in the longitudinal direction of the main girder are supported and the load is loaded at the center, A step of installing a symmetric prestress in the transverse direction of the girder member by disposing the girder in contact with the main girder on the lower height with respect to the center of the cross section of the main girder and releasing the support to the main girder and releasing the load, ; b) joining the girder member to the upper portion of the temporary vent so that the prestress acts in a direction to generate a camber upward transversely at the longitudinal center of the girder member; and c) installing a flat plate on the girder member. The prestressed girder member according to claim 1,

According to another embodiment of the present invention, there is provided a method of manufacturing a main girder, comprising the steps of: a) providing a pair of main girders each having a curved shape in the longitudinal direction and spaced apart in parallel so that the concave portions face each other, And a prestressing member arranged at a right angle to the main girder at a longitudinally central portion of the main girder; The supporting member is provided such that both end portions of the supporting member are in contact with the main girder on the center height of the cross section of the main girder in a state in which both ends in the longitudinal direction of the main girder are supported and a load is applied to the central portion, The main girder is contacted with the main girder on the lower height with respect to the center of the cross section of the main girder and the other end is provided on the main girder so as to come into contact with the main girder over the entire height of the cross section, So as to introduce an asymmetrical prestress in the transverse direction of the girder member; b) a pair of the girder members is symmetrically joined to the upper portion of the temporary vent so as to be spaced apart in parallel, and the prestress is applied in a direction to generate a camber which causes the facing portion of each girder member to be upward in the longitudinal center of the girder member ; c) installing a cross beam between the pair of girder members; and d) installing a flat plate on the girder member and the girder member. The method for constructing a temporary bridge using the prestressed girder member is provided.

According to another embodiment of the present invention, there is provided a method of constructing a temporary bridge using a prestressed girder member, wherein the main girder is a steel pipe.

According to another embodiment of the present invention, there is provided a method for constructing a temporary bridge using a prestressed girder member, characterized by further comprising the step of filling concrete in the steel pipe between steps b) and c) .

According to another embodiment of the present invention, in the step a), the girder member is fabricated to further include a diaphragm at a portion where the supporting member and the prestressing member are joined on the length of the steel pipe. A method of constructing a hypothetical bridge is provided.

According to another embodiment of the present invention, in the step a), the girder member is formed on the outer surface of the portion where the supporting member and the prestressing member are joined on the length of the steel pipe, one end of the girder member has a shape engaging with the outer surface of the steel pipe, Wherein a plurality of bolt holes are formed in the steel plate to attach a supporting member or a joint auxiliary member for joining the prestressing member and the steel pipe to each other.

Since the construction method of the present invention uses a girder member having a prestress introduced in the transverse direction, the structural performance of the temporary bridge is excellent and accordingly, a smaller amount of the steel material is required. Therefore, have.

Such a prestress is introduced in the process of manufacturing the girder member, and the girder member is made in a state where two main girders are kept spaced from each other, so that the work in the field can be reduced.

In addition, since the girder member has a wide width, it can be stably mounted on a temporary vent without any additional means, and such a girder member has little possibility of being conducted by working load or the like.

When the main girder constituting the girder member is a steel pipe, the structural performance of the suspension bridge can be further improved, and the performance of the vibration can be improved by filling the concrete in the steel pipe.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view showing a method of constructing a hypothetical bridge according to a first embodiment of the present invention in order; Fig.
FIG. 2 is an explanatory view showing a procedure of manufacturing a girder member used in the method of constructing a temporary bridge in sequence.
3 and 4 are perspective views of a girder member manufactured by the girder member manufacturing process.
Fig. 5 is an explanatory view of a case where the main girder constituting the girder member is a steel pipe, and the girder member further comprises a diaphragm.
6 is an explanatory view of a method of constructing a hypothetical bridge according to a second embodiment of the present invention.
7 is a perspective view of a girder member used in a method of constructing a temporary bridge of the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, however, it is to be understood that the present invention is not limited to the disclosed embodiments.

The present invention relates to a method of constructing a temporary bridge, in which not only a structural efficiency of a bridge can be improved by constructing a temporary bridge using a girder member having a prestress introduced in the transverse direction of the member, It is a construction method that has a stable shape and it is possible to construct a temporary bridge quickly and safely.

Fig. 1 shows a first embodiment of a method for constructing a hypothetical bridge according to the present invention.

The method for constructing a temporary bridge according to the present invention comprises the steps of: a) fabricating a girder member 100 such that a symmetric prestress is introduced in a transverse direction; b) simply joining the girder member (100) to the upper portion of the temporary vent (200); and c) installing a flat plate (300) on the girder member (100).

Hereinafter, the method of constructing the hypothetical bridge will be described step by step.

a) a step of manufacturing the girder member 100 (Fig. 1 (a));

A pair of main girders 110 having a shape curved in the longitudinal direction and spaced apart in parallel so as to face each other with a concave portion facing the main girder 110 at right angles to the main girder 110 at both longitudinal ends of the main girder 110 And a prestressing member 130 disposed at a right angle to the main girder 110 at a longitudinally central portion of the main girder 110. [

2, the manufacturing process of the girder member 100 is described in more detail.

The fabrication of the girder member 100 includes the steps of (i) preparing a pair of main girders 110 curved in the longitudinal direction (FIG. 2 (a)); (Ii) a process (FIG. 2 (b)) of arranging a pair of main girders 110 in parallel so as to face each other so that the concave portions of the main girders 110 face each other; Iii) a process (FIG. 2 (c)) of supporting both ends of the main girder 110 in the longitudinal direction and placing the main girder 110 in a straight line by loading a load P at the central portion; Iv) A support member 120 perpendicular to the main girder 110 is disposed on both ends of the main girder 110 in the longitudinal direction thereof and on the center height of the main girder 110 to connect a pair of main girders 110 (Fig. 2 (d)); V) connecting a pair of main girders 110 by arranging a prestressing member 130 orthogonal to the main girder 110 on the lower height with respect to the center of the cross section in the longitudinal center portion of the main girder 110 (Fig. 2 (e)); (Vi) a process of supporting the main girder 110 and releasing the load load (FIG. 2 (f)).

As described above, since the main girder 110 has a curved shape in its longitudinal direction, when the supporting and loading of the main girder 110 is released in the process (vi), the main girder 110 is returned to its original shape do. Since both ends of the main girder 110 are fixed by the supporting member 120 and the lower portion of the main girder 110 is fixed by the prestressing member 130 in the center of the main girder 110, Only the portion where the member 130 is not bonded returns to its original shape, and a moment Mp as a prestress is introduced into the girder member 100 in the transverse direction.

3 and 4 show the direction of the prestress Mp acting on the girder member 100 and the girder member manufactured by the above-described fabrication process. The main girder 110 constituting the girder member 100 may be formed of an I-shaped steel as shown in FIG. 3, or may be a steel pipe 110 'as shown in FIG.

Since the steel pipe 110 'has a closed cross-section and thus has excellent sectional performance, when the main girder 110, which plays a major role in the girder member 100, is made of a steel pipe 110' It is possible to form a member.

When the main girder 110 is formed of a steel pipe 110 ', the steel pipe 110' may have a circular cross-section as shown in FIG. 4, but may have a polygonal upper cross-section such as a square have.

In the case where the main girder 110 is a steel pipe 110 ', the girder member 100 has a diaphragm 111 at a portion where the support member 120 and the prestressing member 130 are joined on the length of the steel pipe 110' As shown in FIG. Fig. 5 is an explanatory view of the diaphragm 111. Fig.

The diaphragm 111 is formed to have the same size as the cross section of the space in the steel pipe 110 'inside the steel pipe 110' as shown in FIG. 5 (a) The outer surface of the steel pipe 110 'is formed so as to surround the outer surface of the steel pipe 110', thereby preventing the steel pipe 110 'having an empty space from being deformed by bonding with the support member 120 or the like.

The girder member 100 may be manufactured such that the joining auxiliary member 112 is attached to the outer surface of the portion where the supporting member 120 and the prestressing member 130 are joined on the length of the steel pipe 110 '

The joint auxiliary member 112 serves to firmly and easily attach the support member 120 or the like to the steel pipe 110 'having an uneven outer surface, and one end of the support member 120' And a plurality of bolt holes are formed in the other end portion for easy connection with the support member 120 and the like.

A plurality of bolt holes formed at the other end of the joint assistant member 112 are formed on the height of the joint assistant member 112 so that the prestressing member 130 is joined to the steel pipe 110 ' The prestraining member 130 can be positioned at a lower portion with respect to the center of the cross section of the steel pipe 110 '.

As described above, in order to introduce the prestress into the girder member 100, a conventional steel pipe, a steel bar, a steel plate, or the like is used, unlike the case in which a tension member is used to introduce a prestress in the width direction of a bridge. Making it economical and easy to manufacture.

b) simply joining the girder member 100 to the upper portion of the temporary vent 200 (Fig. 1 (b));

The girder member 100 manufactured in the step a) is bonded on the temporary vent 200 in order to construct the upper structure of the temporary bridge. The hypothetical vent 200 is a vertical structure to be fixed on the ground, and functions as a bridge or pier of a general bridge, and is constructed by assembling a plurality of steel bars, steel pipes, and the like. The temporary vent 200 may be constructed only until the girder member 100 is joined to the upper portion thereof.

The girder member 100 is bonded such that the prestress acts in a direction that generates a camber upward in the transverse direction at the longitudinal center. Such a prestress improves the lateral stiffness of the upper structure by canceling the moment generated in the width direction of the upper structure when using the temporary bridge. Since the girder member 100 has excellent rigidity in the width direction, a smaller amount of steel is required to form a temporary bridge having an upper structure having a constant width, as compared with a general girder.

Since the prestress is introduced in the process of manufacturing the girder member 100, a separate operation for reinforcing the lateral direction stiffness of the temporary bridge is not required in the field.

In addition, since the two main girders 110 are formed in an assembled state, the girder member 100 can be omitted from work in the field to connect the girders, and a wide width And can be stably mounted on the hypothetical vent 200 without any other means. Accordingly, the dangerous leveling work is reduced and the girder member 100 is not likely to be conducted by the work load during the elevating work, which contributes to the safety of workers.

c) installing the laminating plate 300 on the girder member 100 (Fig. 1 (c));

The construction of the temporary bridge is completed by installing the floor plate 300 on the girder member 100 to make the work surface of the temporary bridge.

In the method of constructing the presently-installed bridges, it is possible to apply the existing temporary vent 200 and the laminating plate 300, aside from the girder member 100, so that the supply and demand of the required materials can be smoothly performed.

If the main girder 110 constituting the girder member 100 is a steel pipe 110 ', the step of filling the steel pipe 110' with concrete may be further performed between steps b) and c).

When the concrete is filled in the steel pipe 110 'having a closed cross section, the structural performance of the girder member 100 can be further improved by the force that the steel pipe 110' confines the concrete. Since the empty space in the steel pipe 110 'is filled, the girder member 100 into which the moment as the prestress is introduced can firmly maintain the shape and the prestress against the external force. In addition, since most of the members are made of steel, the performance against vibration of a hypothetical bridge which is susceptible to vibration can be improved.

Hereinafter, a second embodiment of the method of constructing a hypothetical bridge according to the present invention will be described. The second embodiment will be described, while a detailed description of the same parts as those of the first embodiment will be omitted.

Fig. 6 is an explanatory diagram of a second embodiment of the present invention.

The second embodiment is a method that can be applied when building a hypothetical bridge having a larger width.

A method of constructing a temporary bridge according to a second embodiment of the present invention comprises the steps of: a) a pair of main girders (110) each having a curved shape in the longitudinal direction and spaced apart in parallel so that concave portions face each other, A supporting member 120 disposed at right angles to the main girder 110 at both longitudinal ends of the main girder 110 and a prestressing member 120 disposed at a right angle to the main girder 110 130) is formed on a side of the girder member (100); The support members 120 are supported at both ends in the longitudinal direction of the main girder 110 and at the center of the main girder 110 in a state where the main girder 110 is straight, The prestressing member 130 has one end abutting the main girder 110 on the lower height with respect to the center of the cross section of the main girder 110 and the other end abutting on the main girder 110 The girder member 100 is provided so as to be in contact with the main girder 110 on the entire height of the cross section of the girder member 110 and then released to support the main girder 110 and to release the load, So as to introduce a prestress; b) a pair of the girder members 100 are symmetrically arranged in parallel and spaced apart from each other and are simply joined to the upper portion of the hypothetical vent 200, wherein a prestress is formed at a center of the girder member 100 in the longitudinal direction, And a camber for causing the portion to be upward; c) installing a beam (400) between the pair of girder members (100); d) installing a laminator 300 on the girder member 100 and the beam 400.

One end of the prestressing member 130 is joined to the main girder 110 at a lower height with respect to the center of the cross section of the main girder 110 in the manufacturing process of the girder member 100 used in the second embodiment, A moment as a non-symmetrical prestress in the transverse direction of the girder member 100 is introduced so as to be brought into contact with the main girder 110 on the entire height of the cross section of the main girder 110.

Fig. 7 shows the direction of the prestress Mp acting on the girder member 100 and the girder member 100 used in the second embodiment of the present invention.

A pair of the girder members 100 thus manufactured is designed such that in the step b) the prestress acts in the direction of generating the camber which causes the facing portion of each girder member 100 to be upward in the longitudinal center of the girder member 100 And is simply bonded onto the hypothetical vent 200. After a pair of the girder members 100 are joined on the temporary vent 200, a cross beam 400 is installed between the pair of the girder members 100 in step c) .

Accordingly, a pair of the girder members 100 are formed to have a shape in which the center is upward in the width direction of the temporary bridge, and the deformation that causes the middle portion in the width direction to be sagged downward due to the self weight and the work load of the upper structure can be canceled do.

After the cross beams 400 are installed between the pair of the girder members 100, the construction of the temporary bridge 300 is provided by providing the flat plate 300 on the girder member 100 and the cross beam 400 as in the first embodiment I will finish.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be obvious that various modifications may be made within the scope of the idea. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

100: girder member 110: main girder
110 ': Steel pipe 111: Diaphragm
112: abutment auxiliary member 120: supporting member
130: prestraining member 200:
300: Lobby board 400: Rear board
P: Load

Claims (6)

a) a pair of main girders 110 each having a curved shape in the longitudinal direction and spaced apart in parallel so as to face each other with a concave portion facing each other, a pair of main girders 110 arranged at right angles to the main girder 110 at both longitudinal ends of the main girder 110, And a prestressing member 130 disposed at a right angle to the main girder 110 at a central portion of the main girder 110 in the longitudinal direction of the main girder 110, A joint auxiliary member 112 having a plurality of bolt holes formed on a length of the steel pipe 110 'in which the girder 110 is made of a steel pipe 110' and the supporting member 120 and the prestressing member 130 are positioned, Lt; / RTI >
The support members 120 are supported at both ends in the longitudinal direction of the main girder 110 and at the center of the main girder 110 in a state where the main girder 110 is straight, And the prestressing member 130 is connected to the main girder 110 at a lower height with respect to the center of the cross section of the main girder 110, The support to the main girder 110 and the release of the load are released to fabricate the girder member 100 so that the symmetrical prestress in the lateral direction of the girder member 100 is introduced step;
b) joining the girder member (100) to the upper portion of the temporary vent (200) such that the prestress acts in a direction to generate a camber upward transversely at the longitudinal center of the girder member (100) Filling the steel pipe 110 'of the girder 110 with concrete;
(c) installing a flat plate (300) on the girder member (100).
a) a pair of main girders 110 each having a curved shape in the longitudinal direction and spaced apart in parallel so as to face each other with a concave portion facing each other, a pair of main girders 110 arranged at right angles to the main girder 110 at both longitudinal ends of the main girder 110, And a prestressing member 130 disposed at a right angle to the main girder 110 at a central portion of the main girder 110 in the longitudinal direction of the main girder 110, A joint auxiliary member 112 having a plurality of bolt holes formed on a length of the steel pipe 110 'in which the girder 110 is made of a steel pipe 110' and the supporting member 120 and the prestressing member 130 are positioned, Lt; / RTI >
The support members 120 are supported at both ends in the longitudinal direction of the main girder 110 and at the center of the main girder 110 in a state where the main girder 110 is straight, And the prestressing member 130 is connected to the main girder 110 on the lower height with one end of the main girder 110 being in contact with the main girder 110 on the height, And the other end is joined to the joint part auxiliary member 112 so as to be in contact with the main girder 110 on the entire height of the cross section of the main girder 110 and then is attached to the main girder 110 So as to introduce asymmetric prestress in the transverse direction of the girder member (100) by manufacturing the girder member (100) by releasing the support and the load load;
b) a pair of the girder members 100 are symmetrically arranged in parallel and spaced apart from each other and are simply joined to the upper portion of the hypothetical vent 200, wherein a prestress is formed at a center of the girder member 100 in the longitudinal direction, To fill the concrete in the steel pipe (110 ') of the main girder (110);
c) installing a beam (400) between the pair of girder members (100);
and d) installing a flat plate (300) on the girder member (100) and the side beam (400).
delete delete 3. The method according to claim 1 or 2,
The girder member 100 is manufactured to further include the diaphragm 111 at a portion where the supporting member 120 and the prestressing member 130 are joined on the length of the steel pipe 110 ' Construction Method of Hybrid Bridges Using Prestressed Girder Members. delete

Images