KR102363061B1 - Reinforcing member of precast concrete segment connecting portion by the use of tbm method, segment comprising thereof and and manufacturing method for segment - Google Patents

Abstract

A segment fastening structure is provided. An embodiment of the present invention provides a segment fastening structure for coupling adjacent precast segments to each other, comprising: a connection device for forming at least one surface of a lateral surface of a segment connection unit formed in the segment; a reinforcing member for forming at least one surface of the upper surface of the segment connection unit; and an elastic member installed in the reinforcing member to form the segment connection unit. The reinforcing member includes: a reinforcing member base including a central portion and a pair of extension portions extending in the same direction from both tip ends of the central portion so as to have a flat bottom surface while having a C shape of which one surface is opened; and a support unit extending upwardly from each of the pair of extension portions with a predetermined inclination. The connection device includes: a connection device base having a flat bottom surface with a bolt coupling unit arranged; and a connection device column extending from the connection device base with a predetermined inclination, wherein the connection device column may be supported by the support unit. The present invention can shorten a manufacturing period.

Description

Reinforcing material for PC segment connection applied to TBM method, segment including the same, and segment manufacturing method

The present invention relates to a PC segment connecting part reinforcement applied to the TBM method, a segment including the same, and a segment manufacturing method.

The mechanical tunnel excavation method using TBM (Tunnel Boring Machine) equipment has the advantage of reducing civil complaints and shortening the working time by reducing the number of civil complaints compared to the existing NATM method that repeats blasting and drilling.

Recently, it has been applied in various ways to railway tunnels and road tunnels, centering on the construction of electric power districts, and the cases of application to the lower part of the city center, the seabed, and the seabed section are gradually increasing.

In the TBM method, the PC segment is applied to form the tunnel lining and to obtain the driving force for the excavation of the TBM excavator.

The PC segment is a very important structure that not only secures safety during construction where excavation and assembly are repeated, but also has to be able to withstand ground load and water pressure even after construction is complete, and is used as a permanent tunnel lining while maintaining sufficient waterproof performance.

The PC segment is manufactured in a pre-segmented form at the factory and assembled into one ring at the site, but quality defects occur during the manufacturing process at the factory.

In the manufacturing process of PC segment, reinforcing bar mesh and jointing hardware for joints are inserted into a cleanly cleaned mold, concrete is poured, and then it is demolded through steam curing. It is not filled, so as shown in FIG. 1, honeycomb (burr marks) are generated on the side of the PC segment, or corners are cracked, and if the compaction operation is excessive, material separation occurs.

In particular, for the connection of segments, joint hardware is pre-installed before concrete is poured. After demolding, cracking of the segment connection not only causes additional cracks in the future, but also does not look good in terms of aesthetics, so that users (ordering parties) can reduce the quality of the product. will drop

Breakage and breakage of the segment connection part accounts for more than 70% of the total quality defects, and there was a problem in that a large space, manpower, time, and cost were input to repair the cracks in the connection part.

The cracking of the connection part occurs in the process of inserting a rubber bundle in advance to form a groove for filling bolts and screws between the jointed hardware and removing the rubber bundle after demolding.

The main cause of cracking of the connection part is that the cement mortar penetrates into the rubber bundle and the lower surface of the mold during the concrete pouring process due to the lifting phenomenon of the rubber bundle and the lower surface of the mold. As the mortar and rubber bundle fall together, cracks in the joint appear repeatedly, causing a defect in the quality of the segment.

The problem to be solved by the present invention is to fundamentally solve the cracking of the segment connection part after manufacturing the segment. This is to improve the quality of the segment by installing reinforcing materials in advance so that the concrete at the segment connection does not break even if the cement mortar penetrates, and to ensure the completeness of the product in terms of appearance.

In order to solve the above problem, the present invention provides a segment fastening structure for coupling adjacent precast segments to each other, comprising: a connecting device for configuring at least one surface of a side surface of a segment connecting part formed in the segment; a reinforcing material constituting at least one surface of the upper surface of the segment connection part; and an elastic member installed between the reinforcing materials to form the segment connection portion, wherein the reinforcing material has a flat bottom surface and has a 'C' shape with one open side open at the central portion and at both ends of the central portion in the same direction A reinforcing material base including a pair of extension parts extending to and a connecting device column extending with a predetermined inclination from the connecting device base, wherein the connecting device post is supported by the support portion, providing a fastening structure of the segment.

In addition, in order to solve the above problems, the present invention constitutes at least one surface of the segment connection part formed in the precast segment, and in the segment connection part reinforcement for supporting the connection device for coupling the adjacent segments to each other, the flat a reinforcing material base including a central portion and a pair of extension portions extending in the same direction from both ends of the central portion so as to have a bottom surface and an open 'C' shape on one side; and a support part extending outward and upward with a predetermined inclination from each extension part of the pair, wherein the support part end formed on the upper part of the support part has a curved shape to stably support the connection device, segment connection part provide reinforcement.

In addition, in order to solve the above problems, the present invention provides a method for manufacturing a precast concrete segment for forming a tunnel lining, a curved plate having a predetermined curvature, an edge surrounding the curved plate, and an upper surface of the curved plate Install the above-described segment fastening structure and reinforcing bar network in a mold including a protruding plate protruding to a height lower than the rim, wherein the segment fastening structure is installed on the protruding plate; performing concrete pouring and surface finishing on the mold; After steam curing the mold, demolding the steam cured segment; removing the elastic member from the demolded segment; and curing the segment in water to complete the segment manufacture.

In addition, in order to solve the above problems, in the precast concrete segment forming a tunnel lining, the present invention includes a connecting device and a reinforcement for coupling the segments to each other, the reinforcement having a flat bottom surface A reinforcing material base including a central portion and a pair of extension portions extending in the same direction from both ends of the central portion to have an open 'C' shape on one side, and extending upward with a predetermined inclination from each of the pair of extension portions The connecting device includes a connecting device base having a flat bottom surface and provided with a bolt fastening portion, and a connecting device column extending with a predetermined inclination from the connecting device base, wherein the connecting device column is secured by the support portion. a segment supported and defined by the connecting device and the stiffener.

According to an embodiment of the present invention, it is possible to shorten the manufacturing period compared to the conventional segment construction method.

In addition, according to an embodiment of the present invention, damage does not occur in the vicinity of the segment connection part for connecting the segments, so that the repair process is omitted, and thus the construction period can be shortened and the safety of the tunnel construction can be improved.

1 shows the periphery of the segment connection part of the segment manufactured by the conventional segment method.
2 and 3 show a fastening structure of a segment according to an embodiment of the present invention.
4 is a view showing a segment connection part reinforcement according to an embodiment of the present invention.
5 is a view showing a segment connection part reinforcement according to another embodiment of the present invention.
6 and 7 are for showing a method for manufacturing a segment according to an embodiment of the present invention, FIG. 6 is a schematic flowchart, and FIG. 7 is a construction site.
8 and 9 show the installation of a fastening structure of a segment in a mold in a method for manufacturing a segment according to an embodiment of the present invention.
10 illustrates a segment connection part formed in a portion of a lower portion of a segment according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only this embodiment completes the disclosure of the present invention and provides those with ordinary knowledge to the content of the present invention. It is provided for more complete information.

When an element is referred to as being positioned 'above' or 'below' another element in this specification, it means that the element is positioned directly 'above' or 'below' another element, or an additional element is placed between those elements. It includes all the meanings that can be interposed. In this specification, the terms 'upper' or 'lower' are relative concepts set from the viewpoint of the observer. could mean

The same reference numerals in the plurality of drawings refer to elements that are substantially the same as each other. 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, and includes one or more other features, number, or step. , it should be understood that it does not preclude the possibility of the existence or addition of an operation, a component, a part, or a combination thereof.

On the other hand, the precast segment according to the present invention is divided and manufactured in a factory to form a tunnel lining at the same time as tunnel excavation such as electric power outlet, gas pipe, power plant intake and drainage, subway, etc. using TBM (tunnel boring machine) method. It is used to form a tunnel wall by assembling it in a ring at the site after transport to the site, and TBM PC Segment to which a bolt box reinforcement is applied can be applied.

Hereinafter, it will be described in detail with reference to the drawings.

2 and 3 show a fastening structure of a segment according to an embodiment of the present invention.

Referring to FIGS. 2 and 3 , the segment fastening structure 1 is for coupling adjacent precast segments to each other, and includes a connecting device 100 , an elastic member 200 , and a reinforcing material 300 .

For example, in the fastening structure 1 of the segment, the lower portion of the elastic member 200 is fixed between the reinforcing material bases 310 of the reinforcing material 300 , and the connecting device pole 120 is connected to the supporting portion 320 of the reinforcing material 300 . ) may include a supported form.

The connecting device 100 is for fastening adjacent segments using fastening means such as bolting, and includes a connecting device base 110 and a connecting device column 120 .

The connector base 110 has a flat bottom surface, and the bolt fastening part 111 through which the bolt can pass is provided in the center.

The connector base 110 constitutes at least one surface of the side of the segment connection part (21 in FIG. 10) formed in the segment (20 in FIG. 10), as shown in FIG. 10 to be described later. For example, the connector base 110 constitutes an end of the segment ( 20 in FIG. 10 ), and the connector base 110 may abut when the segment ( 20 in FIG. 10 ) is fastened.

The connecting device column 120 extends in a form in which a pair of the connecting device base 110 faces each other at both ends. For example, the connecting device column 120 may extend in a cylindrical shape. For example, the connecting device column 120 may extend from the connecting device base 110 with a predetermined inclination, for example, may have an angle of 45° to 85°.

A spiral protrusion 130 may be provided on the surface of the connecting device column 120 . The spiral protrusion 130 may extend continuously from the surface of the connecting device column 120 in a form surrounding the connecting device column 120 . In addition, the connector post end 121 may have a thicker thickness than the connector post 120 . Accordingly, the connecting device 100 may be firmly fixed within the segment to provide sufficient fixing force for fastening the adjacent segments.

4 is a view showing a segment connection part reinforcement according to an embodiment of the present invention.

2 to 4 , the reinforcing material 300 is for supporting the connecting device 100 during the segment manufacturing process, and includes a reinforcing material base 310 and a supporting part 320 .

The reinforcing material base 310 includes a central portion 311 and a pair of extension portions 312 extending in the same direction from both ends of the central portion 311 and the central portion 311 to have a flat bottom surface and an open 'C' shape on one side. .

The reinforcing material base 310 constitutes at least one surface of the upper surface of the segment connection part (21 in FIG. 10) formed in the segment (20 in FIG. 10), as shown in FIG. 10 to be described later. At this time, the upper surface of the segment connection part (21 in FIG. 10) refers to the upper surface of the segment connection part (21 in FIG. 10) based on the inverted segment (20 in FIG. 10), and the same height as the connection device base 110 can be located in For example, at least one of the central part 311 and the extension part 312 of the reinforcement base 310 may constitute the upper surface of the segment connection part (21 of FIG. 10 ). For example, the entire lower surface of the reinforcing material base 310 may constitute at least a portion of the upper surface of the segment connection part (21 of FIG. 10 ). Accordingly, concrete poured into a mold (10 in FIGS. 8 and 9) to be described later with reference to FIGS. 8 and 9 is formed by the elastic member 200 and the mold (10 in FIGS. 8 and 9), for example, an elastic member. It is not permeated between the 200 and the protrusion plate (13 in FIGS. 8 and 9), so that the elastic member 200 can be easily removed and damage to the segment connection part (21 of FIG. 10) can be prevented.

The end of the extension 312 may have a shape inclined inwardly at a predetermined inclination so that the bottom surface is longer than the top surface. Accordingly, the extension end 313 is easily inserted between the protrusion plate (13 in FIGS. 8 and 9) and the connector base 110 in the mold, and the concrete poured into the mold (10 in FIGS. 8 and 9) The occurrence of air pockets inside can be prevented.

The support part 320 has a predetermined inclination from each of the pair of extension parts 312 and has a shape extending upward. For example, as shown in Figure 4 (a), the support portion 320 extends outwardly upward from the reinforcement base 310, and the lower portion of the elastic member 200 between the pair of extension portions 312 is stably It can be installed and the elastic member 200 can be easily removed after the concrete is cured.

The support end 321 formed on the upper portion of the support supports the connecting device column 120 .

For example, as the support end portion 321 has a curved shape, it is possible to stably support the connecting device column 120 .

As an example, the support end 321 includes a concave section so that the connecting device column 120 can be stably supported.

As an example, the support 320 has an inner surface longer than the outer surface, and the support end 321 has a concave shape in the outer direction as shown in FIG. 120) can be stably supported and space utilization efficiency can be increased.

For example, since the support end 321 and the connecting device post 120 have a male and female structure that can be coupled to each other, the connecting device 100 and the reinforcing material 300 may be stably fixed to each other.

The elastic member 200 is installed between the reinforcing materials 300 to form a segment connection part (21 in FIGS. 8 and 9) in a segment (20 in FIGS. 8 and 9) to be described later with reference to FIGS. 8 and 9 .

For example, the elastic member 200 may include a polyurethane-based material to be easily separated from the cured segment.

The elastic member 200 may have a flat bottom surface and may have a shape extending upward so that the curvature gradually decreases. Accordingly, the elastic member 200 can be easily removed after all the curing process is completed.

5 is a view showing a segment connection part reinforcement according to another embodiment of the present invention.

Referring to FIG. 5 , the reinforcing material 300a may further include a friction imparting unit 330 on the inner surface of the reinforcing material base 310 .

The friction imparting unit 330 allows the elastic member 200 to be firmly attached to the reinforcing material base 310 so that the position of the elastic member 200 is not shaken by the concrete poured into the mold. Between the publications (13 in FIGS. 8 and 9), it is possible to prevent the concrete from permeating.

For example, the friction imparting unit 330 may have an uneven shape. Accordingly, the frictional force between the lower portion of the elastic member 200 and the inner surface of the reinforcing material base 310 may be increased.

For example, the friction imparting unit 330 may have a convex blade shape. Accordingly, the friction imparting unit 330 is inserted into the lower portion of the elastic member 200 , so that the elastic member 200 may be firmly fixed between the reinforcing material bases 310 .

For example, the friction imparting part 330 may be formed on the inner surface of the extension part 312 .

6 and 7 are for showing a method for manufacturing a segment according to an embodiment of the present invention, FIG. 6 is a schematic flowchart, and FIG. 7 is a construction site.

Referring to FIG. 6 , the method of manufacturing a precast concrete segment forming a tunnel lining includes installing the segment fastening structure and reinforcing bar network in a mold as shown in FIGS. 7 (a) and (b) (S1). ); As shown in (c), (d) of Figure 7, performing concrete pouring and surface finishing on the mold (S2); As shown in (e), (f) of Figure 7, performing the demolding operation of the steam-cured and steam-cured concrete (S3); As shown in (g) of Figure 7, to produce a segment by curing in water (S4); and stacking and repairing the segments as shown in (h) of FIG. 7 (S5); may include.

8 and 9 show the installation of a fastening structure of a segment in a mold in a method for manufacturing a segment according to an embodiment of the present invention.

Referring to FIGS. 8 and 9 , the mold 10 is a place where concrete for segment production is poured, and may include a curved plate 11 , a rim 12 , and a protruding plate 13 .

The curved plate 11 has a predetermined curvature and constitutes the bottom surface of the mold 10 , and determines the shape of the lower portion of the segment.

The edge 12 is formed to surround the curved plate 11 to determine the thickness and side shape of the segment.

The protruding plate 13 has a plate shape formed by protruding from the upper surface of the curved plate 11 to a height lower than the rim 12 , and the fastening structure 1 of the above-described segment is seated.

A through hole 14 may be formed at an upper position of the protrusion plate 13 in the rim 12 . The through hole 14 is for fixing the elastic member 200, and the fastening structure 1 of the segment is installed so that the bolt fastening part 111 formed in the connecting device base 110 corresponds to the through hole 14. The fastening structure 1 can be installed in the correct position, and the position of the connecting device 100 can be prevented from being shaken by the concrete being poured by fastening a screw or the like between the through hole 14 and the bolt fastening part 111. there is.

Referring to FIG. 9 in relation to the installation of the segment fastening structure and the reinforcing bar network in the mold (S1), the segment fastening structure 1 may be installed on the upper surface of the protrusion plate 13 .

For example, the reinforcing materials 300 and 300a are seated in a state in which the elastic member 200 is inserted between the extension parts 312 on the upper surface of the protrusion plate 13, and the support part 320 of the reinforcing materials 300 and 300a is placed on the support part 320 . The connecting device column 120 is supported, and the fastening structure 1 of the segment may be installed so that the bolt fastening part 111 formed in the connecting device base 110 and the through hole 14 of the rim 12 correspond.

The elastic member 200 of the above-described segment fastening structure 1 may be removed from the demolded segment formed as a result of step S3 to form a segment connection portion (21 in FIG. 10 ).

10 shows a segment connection part formed in a part of the segment lower portion according to an embodiment of the present invention, for example, FIG. 10 is a segment formed by pouring concrete into the mold described above with reference to FIGS. 8 and 9. It may indicate a segment connection part that is visible when the

Referring to FIG. 10 , a precast concrete segment 20 forming a tunnel lining includes a connecting device 100 and reinforcing materials 300 and 300a for connecting adjacent segments 20 to each other.

The specific structure and effect of the connecting device 100 and the reinforcing materials 300 and 300a may be applied to the above-mentioned bar, and the segment connecting portion 21 by the connecting device 100 and the reinforcing materials 300 and 300a in the lower portion of the segment 20. can be defined.

That is, the segment connection part 21 may be defined by a space from which the elastic member 200 is removed, and one side of the side surface of the segment connection part 21 is composed of the connection device base 110 , and the segment connection part 21 . At least a portion of the upper surface of the may be configured as the bottom surface of the reinforcement base (310). Accordingly, concrete does not permeate between the elastic member 200 and the protruding plate 13 and between the elastic member 200 and the connecting device base 110, so that the segment connecting portion 21 and its It can be done to avoid damage to the periphery.

As described above, the specific 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 with preferred examples of the present invention, the present invention is limited only to the above embodiments. It should not be understood, and the scope of the present invention should be understood as the following claims and their equivalents.

For example, the drawings are schematically shown with each component as a main body to help understanding, and the thickness, length, number, etc. of each illustrated component may differ from the actual one in the course of drawing creation. In addition, the material, shape, dimension, etc. of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes are possible within a range that does not substantially depart from the effects of the present invention.

10: mold
11: bend plate
12: border
13: protrusion plate
14: through hole
20: segment
21: segment connection
1: Segment fastening structure
100: connector
110: connector base
111: bolt fastening part
120: connector column
121: connector post end
130: spiral protrusion
200: elastic member
300: stiffener
310: reinforcement base
311: central part
312: extension
313: end of extension
320: support
321: support end
330: whether friction
400: reinforced structure

Claims (10)

In the fastening structure of segments for joining adjacent precast segments to each other,
a connecting device for configuring at least one surface of a side surface of the segment connecting portion formed on the segment;
a reinforcing material constituting at least one surface of the upper surface of the segment connection part; and
an elastic member installed between the reinforcing materials to form the segment connection part;
including,
The reinforcing material is a reinforcing material base including a central portion and a pair of extension portions extending in the same direction from both ends of the central portion so as to have a flat bottom surface and an open 'C' shape on one side and from each of the pair of extension portions and a support portion extending upward with a predetermined inclination,
The connecting device includes a connecting device base having a flat bottom surface provided with a bolt fastening portion, and a connecting device column extending with a predetermined inclination from the connecting device base,
The fastening structure of the segment, which is a structure in which the connecting device column is supported by the support part.
The method according to claim 1,
A fastening structure of a segment, wherein the end of the support formed on the upper portion of the support has a curved shape to stably support the column of the connecting device.
3. The method according to claim 2,
The support portion extends outwardly and upwardly from the reinforcing material base so that the lower portion of the elastic member is stably installed between the pair of extension portions and the elastic member is easily removed after the concrete is cured.
The method according to claim 1,
The elastic member has a flat bottom surface and has a shape extending upward so that the curvature is gradually reduced, the fastening structure of the segment.
The method according to claim 1,
The connecting device includes a spiral protrusion extending from a surface of the connecting device column in a helical shape surrounding the connecting device column and a connecting device post end having a thickness greater than that of the connecting device column.
In the segment connection part reinforcement member constituting at least one surface of the segment connection part formed in the precast segment, and for supporting the connection device for coupling the adjacent segments to each other,
a reinforcing material base including a central portion and a pair of extension portions extending in the same direction from both ends of the central portion to have a flat bottom surface and an open 'C' shape on one side; and
a support portion extending outward and upward with a predetermined inclination from each of the pair of extension portions;
including,
The end of the support portion formed on the upper portion of the support portion has a curved shape to stably support the connection device, segment connecting portion reinforcement.
7. The method of claim 6,
As the end of the extension has a shape inclined inwardly at a predetermined inclination so that the bottom surface is formed longer than the top surface, it is easily inserted between the protrusion plate in the mold and the base of the connecting device and to prevent the occurrence of air pockets in the concrete being poured A segment joint reinforcement having a shape.
A method for manufacturing a precast concrete segment forming a tunnel lining, the method comprising:
Fastening the segment according to any one of claims 1 to 5 to a mold including a curved plate having a predetermined curvature, an edge surrounding the curved plate, and a protruding plate protruding from an upper surface of the curved plate to a height lower than the edge A structure and a reinforcing bar network are installed, and the fastening structure of the segment is installed on the protrusion plate;
performing concrete pouring and surface finishing on the mold;
After steam curing the mold, demolding the steam cured segment;
removing the elastic member from the demolded segment; and
Curing the segment in water to complete the segment fabrication;
Including, segment making method.
A precast concrete segment forming a tunnel lining comprising:
a connecting device and a reinforcing material for coupling the segments to each other;
The reinforcing material has a flat bottom surface and has a central portion and a pair of extension portions extending in the same direction from both ends of the central portion so as to have a 'c' shape with one surface open. From each extension portion of the pair. and a support portion extending upward with a predetermined inclination,
The connecting device includes a connecting device base having a flat bottom surface provided with a bolt fastening portion, and a connecting device column extending with a predetermined inclination from the connecting device base,
The connecting device pillar is supported by the support part,
A segment connection is defined by the connection device and the stiffener.
10. The method of claim 9,
A segment, wherein the connecting device constitutes at least one surface of a side surface of the segment connecting portion.

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