KR200351467Y1 - A tunnel structure - Google Patents

Abstract

In the tunnel structure that minimizes the cracking of the segment caused by the change of the earth pressure acting on the segment in the process of filling the arch sequentially by supporting the arched segments, which are precast concrete members, with mutual rotation. It is started. The first and second segments are formed on the ground at regular intervals, the first and second segments are sequentially formed in the first foundation, and the second and second arc segments are sequentially formed in the second foundation. The ends have arcuate segments that are mutually supported to form a tunnel, and an arcuate recess 21a is formed at the end of the first segment 21, and at the end of the second segment 22 is a recess 22a. It has a structure in which the arc-shaped convex part 22a which is slidably coupled is formed. In addition, the metal plates 61 and 62 are fixed to the outer surface of the concave groove and the convex portion to prevent cracks due to mutual friction. Such a tunnel structure has a structure in which the arcuate first and second segments are hinged by mutual arc-shaped concave grooves and convex portions, so that the earth pressure acting on the member during the step-by-step filling process is changed. As the segments hinge each other, it is easy to adapt to changes in the cross-sectional force of the member.

Description

Tunnel structure having an arc segment

The present invention relates to a tunnel structure having an arc segment, and more particularly, a plurality of arch segments, which are precast concrete members, are rotatably supported on the outside of the segment. In order to minimize the cracking of the segment caused by the change of the earth pressure acting on the segment during the filling process, the arched segment was made to enable on-site assembly without the use of temporary materials such as supporting posts. The branch relates to the tunnel structure.

In general, the construction of a covered tunnel forms a concrete formwork on the ground, and in general, concrete is formed in the formwork to form a tunnel.

However, this construction method requires the installation of temporary materials such as supporting posts to form the formwork, and the construction period such as curing time of cast-in-place concrete is prolonged.

Recently, a method of constructing a tunnel by sequentially installing arc-shaped precast segments manufactured in a factory in the field has been used.

FIG. 1 shows a schematic diagram of tunnel construction using precast segments, which form a foundation 1 along the edge of the tunnel, and support the tunnel while facing each other with the segments 2 zigzag to each other. To form.

However, this construction method requires a large stress at the end of each segment (2) in contact with the base (1), which is the lower hinge portion to thicken the thickness of the segment (2), enormous due to the transport and installation of the segment (2) Effort is required.

2 and 3 show the cross section of the tunnel constructed by the improved construction method to solve this problem. This is a technique disclosed in Japanese Patent Application Laid-open No. Hei 8-109645, and after the foundation 4 is installed on the covered ground, the foundation 4 is formed to face the arc-shaped precast segment 3 so as to form an arcuate tunnel. , The concrete layer (11) on the outer circumferential side of the tunnel to a certain thickness to cure and fill and finish the tunnel.

In addition, on the outer circumferential side of the segment 3, the reinforcing bar 5, 6 is formed so as to be embedded in the concrete layer 11.

This tunnel construction method has the advantage of constructing a high-strength arcuate tunnel by the reinforcing bar (5) (6) and the concrete layer (11), while in the field together with the factory-made precast segment (3) 11) There is a lot of trouble in construction to cast.

In addition, as shown in FIG. 4, the parts in which the segments 3 are in contact with each other are brought into contact with the flat surface contact (“A: portion), so that the earth pressure in the process of filling the outer circumferential side of the segment 3 is achieved. Contact force is damaged during rotation of hinge part ("A" part) by external force by () and becomes structurally unstable.

In addition, the "A" part of each segment 3 facing each other is in flat contact, so that the external force in the shear direction due to earth pressure on the outer circumferential side of the segment 3 acts on the segment 3, so that it is vulnerable to the shear force. Causes cracking of the segment 3.

The present invention was created in order to solve the above problems, the arc-shaped to minimize the cracking of the segment despite the generation of moment due to earth pressure in the process of laying on the outer circumferential side after supporting the arc-shaped segment facing each other The purpose is to provide a tunnel structure having segments.

1 is a schematic view of a general tunnel structure,

Figure 2 is a cross-sectional view showing a conventional tunnel structure,

3 is an enlarged view illustrating main parts of FIG. 2;

4 is a schematic diagram illustrating a hinge behavior of the tunnel structure disclosed in FIG. 2;

5 is a perspective view showing a tunnel structure according to an embodiment of the present invention;

6 is a sectional view of the main part of FIG. 5;

7 and 8 are cross-sectional views showing an embodiment of the foundation employed in the tunnel structure of the present invention embodiment,

9A is a perspective view of first and second segments employed in the inventive tunnel structure;

9B is a sectional view showing the construction state of FIG. 9A;

10A to 10C are schematic views illustrating a construction method of the tunnel structure of the present invention.

* Explanation of symbols for main parts of the drawings

21st segment 21a ... concave groove

22 ... second segment 22a ... convex

31,32 ... 1st, 2nd base 40 ... waterproof film

50 fixing means 51a, 51b, 52a, 52b

55.Separated block 61,62 ... Metal plate

The present invention to achieve the above object is the first and second foundations are formed on the ground at regular intervals, the arcuate first segment is erected sequentially on the first foundation and the arcuate second segment is erected sequentially on the second foundation In a tunnel structure having arcuate segments facing opposite first and second segment ends to form a tunnel,

An arcuate concave groove is formed at an end of the first segment, and an arcuate convex portion slidably coupled to the concave groove is formed at an end of the second segment.

The tunnel structure of the present invention is fixed to the metal plate in order to prevent abrasion or cracking due to friction on the outer surface of the concave groove and the convex portion.

In addition, the inventive tunnel structure includes a fixing means for interconnecting and fixing the plurality of first segments adjacent to each other, and a fixing means for interconnecting and fixing the plurality of second segments adjacent to each other.

The fixing means may include a reinforcement bar that is partially reinforced to protrude to an outer edge of the end of each of the first and second segments, a separation block seated on an upper surface of a boundary between the first segment and the second segment, and the reinforcement bar may be embedded. It is characterized by having a cast and cured concrete, and a waterproof film applied to the outer surface of the concrete and the separation block.

According to the features of the present invention, the tunnel structure of the present invention is generated in the process of filling the soil on the outer circumferential surface of the first and second segments by the first segment and the second segment are hinged by mutually arcuate surface contact. Since the rotation is performed at the contact portion of the first and second segments according to the change in the earth pressure, the bending moment occurring in the members (first and second segments) is minimized to achieve structural stability.

In addition, by fixing the metal plate on the contact surface of the first and second segments, the crack and wear of the member due to the friction during the hinge behavior is prevented.

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

The tunnel structure of the present invention is installed at, for example, a portion crossing a railroad or a road to form an underground passage so that the vehicle can cross the road at the top and the bottom.

Referring to Figure 5 showing the tunnel structure of the present invention, it is formed on the ground at a predetermined interval, the first and second foundations 31 and 32, the first foundation (31) arched (arch type) first Segments 21 are sequentially erected, and arcuate second segments 22 are sequentially erected on the second foundation 32 so that the ends of the first and second segments 21 and 22 facing each other are mutually supported to form a tunnel. It is a structure to form.

As shown in FIG. 7, each of the foundations 31 and 32 includes an accommodation groove 31b in which the lower end of each segment 21 and 22 is accommodated in the foundation concrete 31a. The base mortar 31c is poured on the bottom surface of 31b, and the lower end of each segment 21, 22 is accommodated in the accommodation groove 31b, and then the mortar 31d is filled in the accommodation groove 31d. .

In addition, as shown in Figure 7, the lower end side of the segment (21) 22 employs a cushioning material (31k), such as rubber, so that each segment (21) (22) is hinged by earth pressure according to the fill This was to facilitate.

As another embodiment of the foundation 31, 32, as shown in Figure 8, the reinforcement bar to form a space for accommodating the lower end of each segment 21, 22 in the foundation concrete 31e 31f is embedded, foundation mortar 31g is poured on the bottom surface of the foundation concrete 31e, and the lower end of each segment 21, 22 is accommodated inside the reinforcing bar 31f and then filled with mortar 31h. It can be configured as a structure.

In addition, as described above, chamfers 21b are formed at lower ends of the first and second segments 21 and 22 to facilitate hinge behavior when moments are generated by earth pressure.

Meanwhile, the first and second segments 21 and 22 have a structure in which they are mutually supported and hinged, and as shown in FIGS. 6 and 9, an arc of concave is formed at the end of the first segment 21. A groove 21a is formed, and an arc-shaped convex portion 22a that is slidably coupled to the concave groove 21a is formed at an end of the second segment 22.

In addition, metal plates 61 and 62 are fixed to outer surfaces of the concave grooves 21a and the convex portions 22a to prevent abrasion or cracking due to mutual friction.

Since the first and second segments 21 and 22 are arcuate, the earth pressure, the hydraulic pressure, and the traffic load acting from the outside act as the axial compressive force of the first and second segments 21 and 22, thus compressing the concrete. Economical cross-sectional design is possible by making the most of strength. This arch structure is mainly due to the characteristics of the concrete supporting the compressive force is almost no cracking is easy to maintain the structure.

In addition, in the embodiment of the tunnel structure of the present invention, fixing means for interconnecting and fixing the plurality of adjacent first segments 21 and fixing means for interconnecting and fixing the plurality of adjacent second segments 22 are provided. Equipped.

The fixing means fixes the plurality of first segments 21 adjacent to each other and fixes the plurality of second segments 22 adjacent to each other.

5, 6 and 9, the fixing means 50 is a reinforcement (51a, 51b) is arranged so that a part protrudes to the outer edge of the end of each of the first and second segments (21) (22) ) 52a, 52b, a separation block 55 seated on an upper surface of the boundary between the first segment 21 and the second segment 22, and the reinforcing bars 51a, 51b, 52a, 52b are embedded. Concrete 53 and 54 that are poured and cured, the waterproof film 56 applied to the outer surface of the concrete 53, 54 and the separation block 55, and a waterproof protective film on the surface of the waterproof film 56 57) has a coated structure.

The separation block 55 employs a material such as styrofoam so that the poured concrete 53 and 54 are separated from each other, so as to fill the outer circumferential surface of the first and second segments 21 and 22 after construction. In the process of (iii), the connecting portions of the first and second segments 21 and 22 are hinged.

Meanwhile, as shown in FIG. 5, after the first and second segments 21 and 22 that are sequentially formed on the bases 31 and 32 are constructed to interlock with each other, the first and second segments ( The fixing means 50 is constructed at the hinge connection portion of the 21 and 22, and a waterproof film (waterproof tape) 40 for waterproof is installed at the adjacent first and second segments 21 and 22.

In addition, as shown in Figs. 9A and 9B, the reinforcing bars 51c and 52c are arranged at the edges of the adjacent segments 21 and 22, that is, the longitudinal edges along the arc, and the adjacent segments ( By reinforcing the reinforcing bars 51c and 52c of 21) and 22 together with the concrete 80, the adjacent segments arranged in the longitudinal direction of the tunnel were fixed to each other to be structurally stabilized. Reference portion 82 easily supports the hinge behavior of the segments 21 and 22 as cushioning material.

Tunnel structure of the present invention embodiment having the structure as described above is constructed in the following way.

First, the ground is stopped and the first foundation 31 and the second foundation 32 are constructed at intervals of the tunnel width. The construction of the first and second foundations 31 and 32 is performed by the method of the embodiment shown in FIG. 7 or 8 as described above.

Meanwhile, the first and second segments 21 and 22 are manufactured at the factory and transported and assembled to the site, and the hinge parts of the first and second segments 21 and 22 are respectively illustrated in FIGS. 6 and 9. As shown in the drawing, an arc-shaped concave groove 21a and a convex portion 22a are formed and manufactured.

The first and second segments 21 and 22 manufactured as described above are precast concrete structures, which do not cause problems of dry shrinkage occurring in cast-in-place concrete structures, and occur in a short period of time using high-strength concrete. Effective adjustment of the creep shape is possible.

In addition, reinforcing bars 51a and 52a are embedded in the upper ends of the first and second segments 21 and 22, respectively, to protrude part of the first and second segments 21 and 22, and also in the main surfaces of the concave grooves 21a and the convex portions 22a. Each of the metal plates 61 and 62 is fixed.

The first and second segments 21 and 22 manufactured as described above are sequentially formed using the crane 100 on the first and second foundations 31 and 32, respectively, to form a tunnel. As shown, the second segment 22 is erected on the second foundation 32 by another crane while the first segment 21 is erected on the first foundation 31 by the crane 100. Subsequently, the first and second segments 21 and 22 are interlocked with each other.

Subsequently, as shown in FIG. 10B, another second segment 22 is supported on the remaining portion of the first segment 21 that is already standing, and the other second segment 22 is supported on the last standing second segment 22 as shown in FIG. 10C. While supporting the one segment 21, the first and second segments 21 and 22 are engaged with each other in the longitudinal direction of the tunnel.

Subsequently, as shown in FIG. 6, the reinforcing bars 51a and 52a embedded in the first and second segments 21 and 22 are mutually fixed with the other reinforcing bars 51b and 52b, and the first and second segments are respectively fixed. The separation block 55 is seated on the upper surface of the boundary of the segments 21 and 22.

Subsequently, the concrete 53 is poured so that the reinforcing bars 51a and 51b are embedded at upper ends of the plurality of first segments 21 adjacent to the separation block 55 so as to be embedded in the plurality of first segments. 21) is fixed to each other, and the concrete 54 is poured so that the reinforcing bars 52a and 52b are embedded at the upper ends of the plurality of adjacent second segments 22 so that the plurality of second segments 22 are mutually fixed. Fix it.

Subsequently, the waterproofing film 56 and the waterproofing protection film 57 are applied to the outer surfaces of the poured concrete 53, 54 and the separation block 55 to be waterproofed.

After the tunnel is constructed in this way, the outer periphery of the first and second segments 21 and 22 is filled while stopping sequentially from the ground.

As described above, the tunnel structure according to the embodiment of the present invention has a structure in which the first and second segments 21 and 22 are hinged by mutually arcuate recesses 21a and convex portions 22a. Cross section force of the member due to the hinge behavior of the first and second segments 210 (22) in spite of the change in the earth pressure acting on the members (first and second segments 21 and 22) during the filling process. It is easy to adapt to the change of, thereby suppressing the crack in the end of the member, thereby enabling structural stabilization.

The present invention as described above can be implemented without being limited to the above embodiments by adding many modifications without departing from the spirit and scope of the present application.

The tunnel structure of the present invention as described above has the following advantages.

First, the arcuate first and second segments 21 and 22 have a structure in which they are hinged by mutual arc-shaped concave grooves 21a and convex portions 22a. In spite of the change in the earth pressure acting on the first and second segments 21 and 22, the first and second segments 21 and 22 are hinged to each other so that it is easy to adapt to the change in the cross-sectional force of the member. . This suppresses cracking at the end of the member and enables structural stabilization.

Second, by forming a tunnel while mutually supporting the first and second segments 21 and 22 manufactured by the factory, construction can be performed without stopping the traffic of the vehicle in operation.

Third, since the first and second segments 21 and 22 are manufactured at the factory, it is possible to produce high-quality concrete products of high quality, and to minimize the cross-section of the members, and to be economical. Therefore, the construction period of the temporary materials is shortened because the construction group is not needed, so the tunnel construction period is shorter than other construction methods.

Fourth, by employing the metal plates 61 and 62 in the hinge movement portions of the first and second segments 21 and 22, the members are prevented from cracking due to friction / wear during hinge movement, thereby making them more structurally stable. .

Claims (3)

First and second foundations are formed on the ground at regular intervals, and the first and second segment ends are formed in the first foundation and the arcuate second segments are sequentially formed in the second foundation. In the tunnel structure having the arcuate segment is mutually supported to form a tunnel, An arc-shaped concave groove 21a is formed at an end of the first segment 21, and an arc-shaped convex portion 22a is slidably coupled to the concave groove 21a at an end of the second segment 22. Tunnel structure having an arcuate segment, characterized in that formed. The tunnel structure according to claim 1, wherein the metal plates (61) (62) are fixed to outer surfaces of the concave grooves (21a) and the convex portions (22a). According to claim 1 or 2, wherein the fixing means for interconnecting and fixing the plurality of adjacent first segments 21 and the fixing means for interconnecting and fixing the plurality of adjacent second segments (22) Equipped, The fixing means may include reinforcing bars 51a, 51b, 52a, and 52b which are arranged to protrude so that a part of the first and second segments 21 and 22 is formed on the outer edges of the ends of the first and second segments 21 and 22, and the first segment 21 and the first segment 21, respectively. Separation block 55 seated on the upper surface of the boundary of the second segment 22, and concrete (53) and (54), which are laid and cured so that the respective reinforcing bars (51a, 51b) (52a, 52b) are embedded; (53) (54) and the tunnel structure having an arc-shaped segment characterized in that it comprises a waterproof membrane 56 applied to the outer surface of the separation block (55).