KR102485582B1 - Hollow type segmental prestressed concrete box girder using rubber tube mold, manufacturing method thereof, and girder manufacturing system adapted for the manufacturing method thereof - Google Patents

Abstract

Provided is a girder manufacturing system, which can resolve structural vulnerability of joints and provide economic segments. In one embodiment, the girder system for manufacturing a hollow segmental prestressed concrete box girder comprises: a form having an open top and a receiving space therein; at least one rubber tube mold installed in the form to form a cavity in the girder; a form finishing plate installed at an end of the rubber tube mold; and a buoyancy prevention part preventing the rubber tube mold from floating when concrete is poured into the form, wherein the rubber tube mold is installed to penetrate the form finishing plate and has a shape in which the end becomes smaller in thickness. Accordingly, a joint surface of an end of a segment manufactured from the girder system may have an enlarged shape.

Description

HOLLOW TYPE SEGMENTAL PRESTRESSED CONCRETE BOX GIRDER USING RUBBER TUBE MOLD, MANUFACTURING METHOD THEREOF, AND GIRDER MANUFACTURING SYSTEM ADAPTED FOR THE MANUFACTURING METHOD THEREOF}

The present invention relates to a hollow segmented prestressed concrete box girder to which a rubber tube mold is applied, a manufacturing method thereof, and a girder system applied to the manufacturing method.

The joining methods of precast segmental bridges include a cast-in-place joining method in which concrete is poured between segmental girders and reinforcing bars are directly connected, an epoxy joining method in which epoxy is applied between the joint surfaces as an adhesive, and the tension of the tendon without adhesive. There is a dry joining method for joining segments only. The epoxy bonding method is the most commonly applied method because it simplifies field work compared to the cast-in-place bonding method, but there is a problem in that unnecessary stress is additionally generated on the joint surface if the joint is not precisely manufactured. In order to solve this problem, the area of the bonding surface is enlarged in the same way as in Korean Patent Registration No. 10-1163456 or the strength of the bonding surface is increased in the same way as in Korean Patent Registration No. 10-0510254, thereby reducing the manufacturing error of the bonding surface and during on-site bonding. A method for responding to additional stress that may occur due to construction errors was applied.

In the segmented girder or integral girder, it is important to form a hollow inside the box-shaped cross-section PSC girder. For this purpose, the most commonly applied method is to insert expanded polystyrene (hereinafter referred to as EPS) inside and form a box-type girder cross section in a form in which ready-mixed concrete is filled in the other space. EPS is very light in weight and is effective in maintaining the shape of the cross section while resisting the pressure of ready-mixed concrete. However, since the EPS block is very expensive and is permanently buried inside the girder, recycling is not possible, so various studies on the production of precast products using rubber tube form have been conducted.

However, precast products using internal formwork using a conventional rubber tube form have structurally weak joints, resulting in poor rigidity of the girder, and hollow hollows in a certain shape according to the characteristics of the material itself of the rubber tube mold. It is difficult to form, or it is difficult to form a hollow in a certain shape as it rises during concrete pouring with its own buoyancy of the rubber tube mold, it is difficult to reuse members to prevent the rubber tube mold from rising, and depending on the mold height, the rubber tube mold There was a problem that the production efficiency was low as each had to be produced.

The problem to be solved by the present invention is to solve the above problems, to solve the structural weakness of the junction and to provide an economical segment. Specifically, the joint cross section of the segments was enlarged to prevent stress concentration during joining and at the same time secured an opening, and for the formation of the inner hollow part, EPS, which was mainly applied in the past, was used with a rubber tube mold to achieve economic feasibility. is to enhance

In addition, the problem to be solved by the present invention is that the rubber tube mold is manufactured as a module to have various shapes according to the shape height and cross-sectional shape of the girder, and after the curing of the girder is completed, the rubber tube mold can be removed to enable repeated use. Thus, the efficiency of girder manufacturing is improved. Specifically, there is a limit to freely manufacturing the shape of the corner part due to the nature of the rubber material. will be.

In addition, the problem to be solved by the present invention is to provide a structurally stable segment in which a bulkhead is formed while the middle part is filled with concrete by applying two segments per segment in the case of the segment constituting the central part of the girder.

In order to solve the above problems, the present invention provides a girder system for manufacturing a hollow segmented prestressed concrete box girder, comprising: a formwork with an open top and a receiving space therein; at least one rubber tube mold installed in the formwork to form a hollow in the girder; a form closing plate installed at the distal end of the rubber tube mold; and a buoyancy prevention unit for preventing the rubber tube mold from floating when concrete is poured into the formwork, wherein the rubber tube mold is installed to penetrate the formwork closing plate, and the thickness of the distal end is narrowed. It provides a girder manufacturing system in which the joint surface of the end of the segment manufactured from the girder system has an enlarged shape.

According to one embodiment of the present invention, by providing a segment connection portion having an enlarged joint portion that is enlarged at a predetermined ratio from the cross section of the central portion, stress concentration at the joint portion is prevented, and at the same time, a rubber tube mold is applied to reduce cost due to repeated use. can In the manufacture of the rubber tube mold for this purpose, by applying a bent buoyancy prevention plate for forming the corner portion, it is possible to improve the reliability of quality by easily controlling the hollow shape as the disadvantage of rubber material is overcome.

1 and 2 show a girder system according to each embodiment of the present invention.
Figure 3 is for showing the enlarged joint in the girder system according to Figure 1, Figure 3 (a) conceptually shows the connection part viewed from the plane, and Figure 3 (b) conceptually shows the form finish plate viewed from the front it is shown
FIG. 4 shows a joint surface of a segment in a state in which the rubber tube mold is removed by demolding in the girder system according to FIG. 2.
5 shows a state in which the segments according to FIG. 4 are joined and a cross section thereof, FIG. 5 (a) shows a cross-sectional view in the longitudinal direction of the girder in a state in which the segments are joined, and FIG. 5 (b) is FIG. 5 (a) AA cross section is shown in , and FIG. 5 (c) shows a BB cross section in FIG. 5 (a).
6 shows a state in which the reinforcing bar network and formwork closing plate are removed in FIG. 1, FIG. 6 (a) conceptually shows a perspective view, and FIG. 6 (b) conceptually shows a view from the front.
7 is a partial cross-section of a segment constituting the central part of a girder according to an embodiment of the present invention, and FIG. 7 (a) conceptually shows a perspective view, and FIG. 7 (b) conceptually shows a view from a side.
Figure 8 shows a rubber tube mold according to another embodiment of the present invention, Figure 8 (a) shows that a plurality of members can be included between the upper module and the lower module, Figure 8 (b) Fig. 8(a) shows one embodiment.
9 shows a form for fixing a rubber tube mold according to an embodiment of the present invention.
10 shows a finishing form installed in a connection part according to an embodiment of the present invention.
11 shows a method of manufacturing a girder according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention are described in detail. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms, but only the present embodiments make the disclosure of the present invention complete and provide the content of the present invention to those skilled in the art. It is provided to inform you more completely.

In this specification, when an element is referred to as being positioned 'above' or 'below' another element, this means that the element is positioned directly 'above' or 'below' another element, or an additional element is present between them. It includes all meanings that can be intervened. In this specification, the term 'upper' or 'lower' is a relative concept established from the observer's point of view, and if the observer's point of view changes, 'upper' may mean 'lower', and 'lower' may mean 'upper' could mean

In a plurality of drawings, like reference numerals denote substantially the same elements. In addition, terms such as 'comprise' or 'have' are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features, numbers, or steps However, it should be understood that it does not preclude the possibility of existence or addition of operations, components, parts, or combinations thereof.

On the other hand, the term 'segment' referred to in the present invention is a section constituting a segmented prestressed concrete box girder, including both the end part and the center part, and both the state in which the rubber tube mold is included and the state in which the rubber tube mold is removed. include

Meanwhile, the term 'longitudinal direction' referred to in the present invention refers to a direction in which girders extend, and 'thickness direction' refers to a direction perpendicular to the 'longitudinal direction'.

Meanwhile, the term 'inside' referred to in the present invention refers to the center direction of the segment, and 'outside' refers to the opposite direction.

1 and 2 show a girder system according to each embodiment of the present invention.

Referring to FIG. 1, the girder system 1 for manufacturing a hollow segmented prestressed concrete box girder includes a formwork 10, a rubber tube mold 30, a buoyancy prevention unit 40, a formwork closing plate 20, and a reinforcing bar network (R).

The formwork 10 has an open top and has an accommodation space therein. For example, assuming a hexahedron, the formwork 10 may have a form in which the lower surface and a pair of corresponding side surfaces are closed and the remaining three surfaces are open. A pair of open side surfaces may be closed with a formwork closing plate 20 to be described later, and the segment S may be manufactured by concrete pouring and curing. Accordingly, the closed space is defined by the formwork 10 and the formwork closing plate 20 and has an accommodation space therein in the form of an open top.

The rubber tube mold 30 is applied to manufacture hollow girders, and may be installed in the formwork 10. Conventionally, there has been an attempt to develop a technology for applying rubber materials to manufacture hollow girders, but the rubber material is floated by buoyancy and the reliability of hollow production in a consistent form is lowered, the rubber material cannot be recycled, or the hollow There was a problem in that each of the rubber materials should be manufactured according to the shape. The inventors of the present invention have completed the present invention after various trials and errors in order to form a uniform cross section while expanding the cross section of the hollow girder while solving these problems. Embodiments of the rubber tube molds 30 and 30a will be described later with reference to FIGS. 3 and 8 .

For example, one or more rubber tube molds 30 may be installed in the mold 10, and when two or more rubber tube molds 30 are installed, a connection portion C may be formed therebetween. For example, a finishing die 500 may be installed at the connecting portion C as described below with reference to FIG. 10 . For example, when manufacturing the center girder segment S, the bulkhead 300 may be formed by concrete poured between a pair of rubber tube molds 30 as shown in FIG. 7 .

The buoyancy prevention unit 40 is installed on top of the rubber tube mold 30 to prevent the rubber tube mold 30 from floating due to concrete poured into the formwork 10 to secure the reliability of hollow manufacturing in a consistent shape. As such, a specific embodiment will be described later with reference to FIG. 6 .

The formwork closing plate 20 is installed at the distal end of the rubber tube mold 30 within the formwork 10, and may be installed so that, for example, the rubber tube mold 30 penetrates. The present invention includes an expansion joint 110 on the formwork closing plate 20 and a gap maintaining member 111 provided on the expansion joint 110, which will be described later with reference to FIG. 3 .

The reinforcing bar network (R) is to secure girder rigidity, and the rubber tube mold 30 and the buoyancy prevention unit 40 may be inserted into the reinforcing bar network (R) of the present invention. For example, the reinforcing bar network R may include a closed ring shape. For example, an upper reinforcing bar is connected to the reinforcing bar network (R) so that the upper reinforcing bar can protrude on the upper surface after concrete is poured and cured, and the protruding upper reinforcing bar is a structure disposed above the segment (S) and can be unified.

The girder system 2 according to FIG. 2 indicates that the segment S is formed by pouring and curing concrete in the girder system 1 according to FIG. (30), the buoyancy prevention unit 40, the formwork closing plate 20, and the reinforcing bar network (R) may be applied.

Referring to FIG. 2 , a pair of rubber tube molds 30 may be installed in the formwork 10, and a pair of formwork closing plates 20 may be installed at an end of each rubber tube mold 30. At this time, the closing die 500 is installed in the connection part C formed between the segments S and the segments S, and the rubber tube mold 30 can be easily removed by separating the upper closing plate 510. will be described later with reference to FIG. 11 .

Figure 3 is for showing the enlarged joint in the girder system according to Figure 1, Figure 3 (a) conceptually shows the connection part viewed from the plane, and Figure 3 (b) conceptually shows the form finish plate viewed from the front Figure 4 shows the bonding surface of the segments in a state where the rubber tube mold is removed by demolding from the girder system according to Figure 2, and Figure 5 shows the segment according to Figure 4 in a joined state and its cross section, Figure 5 (a) shows a longitudinal cross-sectional view of the girder in a state where the segments are joined, Figure 5 (b) shows the AA cross section in Figure 5 (a), Figure 5 (c) is in Figure 5 (a) It shows the BB cross section.

3 to 5, the formwork closing plate 20 includes a pair of enlarged joints 110 and spacers 111 formed at corresponding positions in the thickness direction, and the rubber tube mold 30 It may be installed to penetrate between the enlarged junctions 110 .

In the present invention, the rubber tube mold 30 includes a central portion 31 extending in the longitudinal direction to include a section having the widest thickness, and a side section portion extending in the longitudinal direction to have a shape in which the thickness decreases from the central portion 31. (32), and an air injection part (33) formed on the end surface part (32). For example, the edge section 32 may be installed on at least one end of the rubber tube mold 30 . For example, the edge portion 32 may include a section in which the thickness gradually decreases from the central portion 31 .

The rubber tube mold 30 is for forming the hollow 200 of the girder, and when the above-described edge section 32 is formed at the end portion, the cross section of the end of the segment S can be enlarged, and the rubber tube mold ( 30) Although the edge section 32 may be formed in its own shape, in consideration of the manufacturing cost, in the present invention, the expansion joint 110 is formed on the formwork closing plate 20 to enlarge the cross section of the end of the segment S can do. That is, the enlargement joint 110 is installed to be located at the edge section 32, and can be defined as the difference in thickness between the center portion 31 and the point where the edge section 32 and the formwork closing plate 20 come into contact. .

In addition, the spacer 111 is made of a soft material, so that the same load transmission surface can be formed when the epoxy is cured with respect to the bonding surfaces of the segments S. For example, the spacer 111 may be applied with less rigidity than cured epoxy. Accordingly, even when manufacturing errors of the segments S occur and the joint surface 100 does not form a perfectly parallel surface, the gap retaining member 111 forms a correction surface to correct the error, and epoxy is applied between the correction surfaces. It can be cured to enable uniform transmission of compressive stress. Due to this, it is possible to prevent the destruction of the bonding surface 100 by preventing local stress concentration.

That is, the present invention includes a rubber tube mold 30 having a side end surface portion 32 and a formwork closing plate 20 through which the side end surface portion 32 of the rubber tube mold 30 passes, and an enlarged joint ( 110), by providing a flexible spacer 111 on the segment (S) end joint surface 100 is enlarged while forming an even cross section during epoxy curing to prevent stress concentration and loss of the existing cross section It can be prevented.

Referring to FIG. 4 , after the rubber tube mold 30 is demolded, it can be confirmed that the enlarged joint 110 and the spacer 111 are provided on the bonding surface 100 of the segment S having a hollow 200. can

Referring to FIG. 5, the expansion joint 110 is formed on the joint surface 100 of the segment S, and the segment S at the joint surface 100 is greater than the thickness of the section of the segment S in the section where the hollow 200 is formed. ), it can be confirmed that the thickness of the cross section is formed thicker.

On the other hand, the guide key (G) shown in FIGS. 4 and 5 is formed on each joint surface 100 of a pair of segments (S) to be joined, and one segment (S) has a protruding form, thereby A recessed shape is applied to the corresponding remaining segment (S) to perform a function of guiding the joining position of the segment (S).

6 shows a state in which the reinforcing bar network and formwork closing plate are removed in FIG. 1, FIG. 6 (a) conceptually shows a perspective view, and FIG. 6 (b) conceptually shows a view from the front.

Referring to FIG. 6 , the buoyancy prevention unit 40 may include a buoyancy prevention plate 43 , a pressing unit 42 , and an upper support unit 41 .

The buoyancy prevention plate 43 has a plate shape extending from the top of the rubber tube mold 30 in the longitudinal direction, and may cover at least a portion of the central portion 31 section of the rubber tube mold 30 . For example, the buoyancy prevention plate 43 prevents the rubber tube mold 30 from rising by buoyancy when a single plate is extended and concrete is poured into the formwork 10, or only a portion of the plate rises. Reliability of manufacturing the hollow 200 having a consistent shape may be improved by preventing the shape of the rubber tube mold 30 from being deformed.

The buoyancy prevention unit 40 is for resisting the force of the rubber tube mold 30 to float by buoyancy, and is a pressing unit 42 having a downwardly extended form to press the buoyancy prevention plate 43 downward. And it may include an upper support portion 41 having a form fixedly installed on the upper surface of the formwork 10 to support the pressing portion 42 .

For example, the upper support portion 41 may have a plate shape installed on the upper surface of the formwork 10 so as to pass through an open area of the formwork 10, and the pressing portion 42 It is fastened to the upper support part 41 and may have a bolt shape whose height is adjusted. Accordingly, the length of the pressing portion 42 can be easily controlled according to the shape or height of the hollow 200 .

7 shows a partial cross-section of a segment constituting the central portion of a girder according to an embodiment of the present invention, and FIG. 7 (a) conceptually shows a perspective view, and FIG. 7 (b) conceptually shows a view from a side.

Referring to FIG. 7, when manufacturing the segment S constituting the central part of the girder with the girder systems 1 and 2 according to an embodiment of the present invention, it is spaced apart at a predetermined interval in the longitudinal direction within one segment S The bulkhead 300 may be formed by pouring concrete between the two installed rubber tube molds 30 .

For example, the bulkhead 300 is formed at the same position as the position of the crossbeam of the girder and is rigidly treated to increase the effect of transverse distribution of the bridge.

That is, when the girder systems 1 and 2 of the present invention are applied, the formation position of the bulkhead 300 in the segment S can be easily controlled.

Figure 8 shows a rubber tube mold according to another embodiment of the present invention, Figure 8 (a) shows that a plurality of members can be included between the upper module and the lower module, Figure 8 (b) 8(a) shows one embodiment.

Referring to FIG. 8 , the rubber tube mold 30a may include an upper module 34 , a lower module 35 , and a height control module 36 .

The upper module 34 is for forming the upper part of the hollow 200 and the lower module 35 is for forming the lower part of the hollow 200, and the hollow 200 of the hollow segment prestressed concrete box girder to be manufactured It can be manufactured according to the shape.

One or more height control modules 36 may be installed between the upper module 34 and the lower module 35, and the number of the height control modules may be controlled according to the height of the segment S. For example, the height control module 36 applies a plate shape having a predetermined height to easily change the height of the rubber tube mold 30a according to the height of the segment S, thereby controlling the rubber tube mold 30a according to the shape of the girder. ), it is not necessary to manufacture each, so the manufacturing cost can be reduced.

For example, the height control module 36 may be a plate-shaped rubber tube having a predetermined height, a circular rubber tube, or a combination of a plate-shaped rubber tube and EPS.

Meanwhile, the rubber tube mold 30a including the upper module 34 , the lower module 35 , and the height control module 36 may have a surface wrapped with the wrapping part 60 . Accordingly, after the concrete is poured and cured in the formwork 10, the modular rubber tube mold 30a can be easily removed as a unit. For example, the wrapping part 60 may include a vinyl material.

9 shows a form for fixing a rubber tube mold according to an embodiment of the present invention.

Referring to FIG. 9 , the buoyancy prevention plate 43 may include a flat plate part 43a and a curved plate part 43b.

The flat plate part 43a may be in contact with the upper surface of the rubber tube mold 30 but have a flat shape and continuously extend in the longitudinal direction.

The bent plate portion 43b may be bent downward at both ends of the flat plate portion 43a and extended by a predetermined length.

The shape of the flat plate portion 43a and the bent plate portion 43b in this form is applied to form the upper shape of the hollow 200 of the hollow segment prestressed concrete box girder according to an embodiment of the present invention, the hollow ( 200) Depending on the shape, the shape of the flat plate part 43a and the bent plate part 43b may be modified.

Meanwhile, a lower support plate 50 may be installed below the rubber tube mold 30 to correspond to the buoyancy prevention plate 43 . The lower support plate 50 is applied to form the lower shape of the hollow 200, and its shape may be modified according to the shape of the hollow 200.

The buoyancy prevention unit 40 according to the present invention is not buried in the manufactured segment (S) and can be removed from the mold during the manufacturing process so that it can be reused to prevent resource waste.

For example, the anti-buoyancy plate 43 can be easily demolded after concrete is poured and cured by applying a release agent on the surface.

For example, a form in which the surfaces of the rubber tube mold 30 and the buoyancy prevention plate 43 are integrally wrapped with the wrapping portion 60 may be applied. Accordingly, after the concrete is poured into the formwork 10, buoyancy is prevented. The plate 43 and the rubber tube mold 30 can be removed together as an integral body.

10 shows a finishing form installed in a connection part according to an embodiment of the present invention.

Referring to FIG. 10 , a connection portion may be formed between two segment ends inside the formwork.

A closing die 500 connecting the segments S to each other may be installed at the connecting portion C. The closing die 500 may have an upper closing plate 510, a lower closing plate 520 and a connection closing plate 530 installed.

The upper closing plate 510 may be detachably installed above the end of the segment (S). For example, a blockout portion 400 having a predetermined thickness and depth removed may be provided on the upper portion of the end portion of the segment S, and a form in which a reinforcing bar 600 protrudes may be applied to the blockout portion 400. . For example, at least a portion of the upper closing plate 510 may be inserted into the block-out portion 400 and may be detachably fastened to the upper surface of the connection closing plate 530 by bolting or the like.

The lower closing plate 520 and the connecting closing plate 530 connect and support the two segments S to each other. It is installed on the top of the silver segment (S), and the lower closing plate 520 and the connection closing plate 530 may be connected to each other with steel plates to secure rigidity.

That is, the connection part (C) according to an embodiment of the present invention is applied with a finishing form 500 including a detachable upper finishing plate 510, and after the segment (S) is produced by pouring and curing concrete, the upper part By separating the closing plate 510 from the connecting closing plate 530, it is possible to secure a spare space, so that the aforementioned rubber tube molds 30 and 30a) and/or the buoyancy prevention plate 43 can be secured through the spare space. can be easily removed.

11 shows a manufacturing method of a hollow segmented prestressed concrete box girder to which a girder manufacturing system according to an embodiment of the present invention is applied, and a description in which the above-described configuration and effects can be applied as they are with reference to FIGS. 1 to 10 will be omitted.

Referring to FIG. 11 (a), it is possible to assemble the reinforcing bar network (R) described above with reference to FIG. For example, reinforcing bars for forming the barrier rib 300 described above with reference to FIG. 7 may be installed in an intermediate region of the reinforcing bar network R.

Referring to FIG. 11 (b), the rubber tube mold 30 and the buoyancy prevention plate 43 may be inserted into the reinforcing bar network R. For example, the buoyancy prevention plate 43 may be seated on the upper surface of the rubber tube mold 30 in a state in which air is injected. For example, a release agent may be applied to the rubber tube mold 30 and the buoyancy prevention plate 43. For example, a form in which the rubber tube mold 30 and the buoyancy prevention plate 43 are integrally wrapped by the lapping part 60 may be applied.

Referring to FIG. 11(c), the reinforcing bar network R into which the rubber tube mold 30 and the buoyancy prevention plate 43 are inserted may be installed in the formwork 10.

Referring to FIG. 11 (d), the formwork finishing plate 20 is installed in the formwork 10 so that the rubber tube mold 30 penetrates, and the pressing part 42 and the upper support part ( 41) may be installed to form the buoyancy prevention unit 40. For example, the formwork closing plate 20 may be installed at the side end surface portion 32 of the rubber tube mold 30 . For example, the upper support part 41 is fixedly installed on the upper surface of the formwork 10, and the pressing part 42 is installed so as to extend downward from the upper support part 41, but the pressing part 42 is buoyancy prevention plate 43 It can be installed to pressurize to a predetermined pressure. For example, the upper closing plate 510 may be detachably installed above the end of the segment (S).

Referring to FIG. 11(e), the segment S may be manufactured by pouring and curing concrete in the formwork 10.

Referring to FIG. 11(f), the mold 10 and the rubber tube mold 30 may be dismantled from the segment S to manufacture the hollow segment S. For example, to dismantle the mold 10 and the rubber tube mold 30, after demolding the segment S to the outside of the mold 10 with the rubber tube mold 30 inserted, the rubber tube mold 30 ) It may include separating the rubber tube mold 30 from the segment (S) by removing the air. For example, a form in which a release agent is applied to the surface of the anti-buoyancy plate 43 or a form in which the surfaces of the rubber tube mold 30 and the anti-buoyancy plate 43 are integrally wrapped with the lapping portion 60 is applied, Both the buoyancy prevention plate 43 and the rubber tube mold 30 can be removed. For example, the rubber tube mold 30 may be removed through a space provided by separating the upper closing plate 510.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings, but since the above-described embodiments have only been described as preferred examples of the present invention, it is believed that the present invention is limited only to the above embodiments. Should not be understood, the scope of the present invention should be understood as the following claims and equivalent concepts.

For example, the drawings are schematically shown with each component as the main body to aid understanding, and the thickness, length, number, etc. of each component shown may differ from the actual one in the progress of drawing. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiment are only examples and are not particularly limited, and various changes are possible within a range that does not substantially deviate from the effect of the present invention.

S: segment
C: Connection
R: rebar net
G: guide key
D: tendon duct
1, 2: girder system
10: formwork
20: formwork closing plate
30, 30a: rubber tube mold
31: central part
32: tapered section
33: air inlet
34: upper module
35: lower module
36: height control module
40: buoyancy prevention unit
41: upper support
42: pressing part
43: buoyancy plate
43a: flat plate
43b: bent plate portion
50: lower support plate
60: wrapping unit
100: bonding surface
110: expansion joint
111: spacing material
200: hollow
300: bulkhead
400: blockout unit
500: finishing formwork
510: upper closing plate
520: lower closing plate
530: connection closing plate
600: rebar

Claims (14)

In the girder system for manufacturing hollow segment prestressed concrete box girders,
A formwork with an open top and an accommodation space therein;
at least one rubber tube mold installed in the formwork to form a hollow in the girder;
a form closing plate installed at the distal end of the rubber tube mold; and
a buoyancy prevention unit preventing the rubber tube mold from floating when concrete is poured into the formwork;
including,
The rubber tube mold is installed to penetrate the formwork closing plate, but has a shape in which the thickness of the end portion is narrowed so that the joint surface of the end of the segment manufactured from the girder system is enlarged,
The buoyancy prevention part includes a buoyancy prevention plate extending in the longitudinal direction from the top of the rubber tube mold and a pressing part for pressing the buoyancy prevention plate downward, and a plurality of buoyancy prevention plates are provided on the top of the buoyancy prevention plate in the form of a single plate being extended. A girder manufacturing system in which the pressurization part is installed to prevent the rubber tube mold from floating and deformation of the shape.
The method of claim 1,
The rubber tube mold,
a central portion extending in the longitudinal direction to include a section having the widest thickness; and
a side section extending in the longitudinal direction so as to have a shape in which the thickness is narrowed from the central part;
have
The formwork finishing plate is installed on the side end portion to form an enlarged joint portion that is a difference in thickness between a point where the edge portion and the formwork finish plate come into contact with the center portion, and the enlarged joint portion is the segment manufactured from the girder system. A girder manufacturing system that allows the joint surface of the end to be enlarged.
The method of claim 2,
A ductile spacer is attached to the outer surface of the expansion joint to form the same load shear surface when joining the segments manufactured from the girder system to prevent stress concentration and loss of section. Girder manufacturing system.
delete The method of claim 1,
For manufacturing the segment constituting the central part of the girder,
Including a partition wall formed by pouring concrete between the two rubber tube molds installed at a predetermined interval in the longitudinal direction within one segment, the partition wall is formed at the same position as the crossbeam position of the girder and treated to form a bridge A girder manufacturing system that can increase the lateral distribution effect of
The method of claim 1,
The rubber tube mold,
an upper module for forming an upper part of the hollow;
a lower module for forming a lower part of the hollow; and
one or more height control modules installed between the upper module and the lower module;
including,
The height control module is a girder manufacturing system in which a plate shape having a predetermined height is applied so that the height of the rubber tube mold is varied according to the segment height.
The method of claim 6,
The girder manufacturing system, wherein the rubber tube mold is removed after the form in which the surface of the rubber tube mold is wrapped with a lapping part is applied and concrete is poured into the formwork.
The method of claim 1,
The buoyancy prevention unit includes a buoyancy prevention plate extending in the longitudinal direction from the top of the rubber tube mold,
The buoyancy prevention plate includes a flat plate part having a flat shape and extending in the longitudinal direction, and a bent plate part bent downward and extending from both ends of the flat plate part.
The method of claim 8,
The buoyancy prevention plate has a form in which a release agent is applied to the surface or a form in which the rubber tube mold and the surface of the buoyancy prevention plate are integrally wrapped with a lapping part is applied, and after concrete is poured into the formwork, the buoyancy prevention plate and the buoyancy prevention plate A girder manufacturing system in which all rubber tube molds are removed.
In the girder system for manufacturing hollow segment prestressed concrete box girders,
A formwork with an open top and an accommodation space therein;
at least one rubber tube mold installed in the formwork to form a hollow in the girder;
a form closing plate installed at the distal end of the rubber tube mold; and
a buoyancy prevention unit preventing the rubber tube mold from floating when concrete is poured into the formwork;
including,
The rubber tube mold is installed to penetrate the formwork closing plate, but has a shape in which the thickness of the end portion is narrowed so that the joint surface of the end of the segment manufactured from the girder system is enlarged,
A connection portion is formed between ends of two or more segments inside the formwork, and an upper closing plate is detachably installed on top of the ends of the segments in the connection portion,
The girder manufacturing system, wherein the rubber tube mold is removed through the space of the connection part in which the upper closing plate is separated and provided.
In the method of manufacturing a hollow segment prestressed concrete box girder to which the girder manufacturing system according to claim 1 or 10 is applied,
Assemble the rebar netting;
inserting the rubber tube mold and the buoyancy prevention plate installed on top of the rubber tube mold together into the reinforcing bar network;
installing the reinforcing bar net into which the rubber tube mold and the buoyancy prevention plate are inserted in the formwork;
installing a formwork closing plate in the formwork so that the rubber tube mold passes therethrough, and installing a pressing part and an upper support part on top of the buoyancy prevention plate to form the buoyancy prevention part;
pouring and curing concrete in the formwork; and
disassembling the formwork and the rubber tube mold;
Including, a girder manufacturing method.
The method of claim 11,
Dismantling the formwork and the rubber tube mold,
demolding the segment out of the mold with the rubber tube mold inserted therein; and
removing air from the rubber tube mold to separate the rubber tube mold from the segments;
Including, a girder manufacturing method.
The method of claim 11,
Dismantling the formwork and the rubber tube mold,
A form in which a release agent is applied to the surface of the buoyancy prevention plate or a form in which the surface of the rubber tube mold and the buoyancy prevention plate are integrally wrapped with a lapping part is applied, and both the buoyancy prevention plate and the rubber tube mold are removed. How to make a girder.
The method of claim 11,
Installing the formwork closing plate in the formwork so that the rubber tube mold penetrates further includes detachably installing an upper finishing plate on an upper part of the end of the segment,
The dismantling of the formwork and the rubber tube mold further comprises removing the rubber tube mold through a space provided by separating the upper closing plate.

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