KR100980798B1 - Precast slab construction method for large section ground tunnel - Google Patents

Abstract

PURPOSE: A method for installing a precast slab in a tunnel with a large diameter is provided to cost-efficiently install precast slabs and to stably support the precast slabs. CONSTITUTION: A method for installing a precast slab in a tunnel with a large diameter is as follows. Support ends are formed on the inner surface of a tunnel with a large diameter and face each other. Precast slabs(100) are continuously formed between the support ends. The support end comprises a concrete support unit and a steel material support unit. The steel material support unit is fixed to a connection bar protruded from the inner surface of a tunnel.

Description

How to install a precast slab in a large diameter tunnel {PRECAST SLAB CONSTRUCTION METHOD FOR LARGE SECTION GROUND TUNNEL}

The present invention relates to a method for installing a precast slab in a large diameter tunnel. More specifically, in a method in which the precast slab is horizontally rotated in the horizontal direction and installed continuously in the longitudinal direction in a circular or oval tunnel having a large diameter installed underground, the slab is formed on the inner surface of the tunnel in the curved surface when the precast slab is installed. The present invention relates to a method for installing a precast slab in a large-diameter tunnel that can easily install the precast slab even in a case where it is difficult to install due to side surface interference.

When tunnels are installed in the sea floor or downtown, tunnels are constructed underground or underground.

Such tunnels are constructed with a large diameter round or oval tunnel cross section. In the case of large diameter tunnels, the slabs are constructed in multiple layers in the transverse direction, allowing vehicles such as vehicles and railways to pass through the upper and lower layers. do.

Looking at the cross-sectional view of the multilayer underground tunnel as shown in Figure 1a,

Largely, it can be seen that the lower slab (A), the middle slab (B) and the upper slab (C) are installed spaced apart up and down.

In order to install the lower slab (A), the upper ends of the tunnel, for example, the support ends (21, 22) are installed to face each other on the same line in the transverse direction so that the end of the lower precast slab (30) is supported on the support end You can install it

In addition, in the middle portion of the inner surface of the tunnel, bracket-type support ends 23 and 24 are also installed so as to face each other on the same line in the transverse direction so that the end of the intermediate precast slab 40 is supported on the upper end of the support end. You know,

In addition, the upper end of the inner side of the tunnel support brackets 25 and 26, which are also bracket-shaped, are installed to face each other on the same line in the transverse direction so that the end of the upper precast slab 50 is supported on the upper end of the support end. It can be seen that.

Referring to FIG. 1A, an example of precast slabs used in the upper, middle, or lower precast slabs 30, 40, and 50 can be seen. In other words,

It can be seen that the overall width (B1) is made in the form of a panel of a rectangular cross-section extending longer than the longitudinal width (B2), the side ends (D, E) are supported at both ends are formed It can be seen that.

Accordingly, the precast slab is manufactured in advance on the ground and transported into the tunnel formed in the ground. If the slab has a large transverse or longitudinal width (B1, B2), it is not easy to transport into the underground tunnel.

Considering the size of vertical tunnels separately constructed at the beginning, end, and middle of underground tunnels, after manufacturing a large number of segment precast slabs, transporting them into underground tunnels is assembled and connected inside the tunnel to install precast slabs. Is used.

Accordingly, in the case of the lower precast slab 30, since the slab rotation limit R1 is larger than the slab rotation boundary R2 based on the installed state of the lower precast slab 30 (R1>). R2) The installation by the horizontal horizontal rotation of the lower precast slab 30 is otherwise not a problem.

That is, by rotating the lower precast slab 30 in the middle of the tunnel having the largest transverse width, the lower precast slab 30 is placed between the supporting ends having a transverse width smaller than the transverse width in the middle of the tunnel. It can be seen that it can be installed, when rotating, it can be seen that one side end and the other end of the lower precast slab 30 can be installed so as not to interfere with the inner surface of the tunnel during rotation.

Accordingly, in the case of the lower precast slab 30, it can be seen that the lower precast slab 30 having a rectangular shape can be used as it is.

On the contrary, in the case of the intermediate precast slab 40 as shown in FIG. 1C, the slab rotation boundary R2 is larger than the slab rotation limit boundary R1 based on the installation state of the intermediate precast slab 40 (R1 < R2) Since the intermediate precast slab 40 cannot be rotated horizontally in the space above the supporting end, the same phenomenon as the lower precast slab 30 occurs and cannot be installed.

Furthermore, in the case of the upper precast slab 50 as shown in Figure 1d, first, the lower and intermediate precast slab is installed, since the installation work is made on the upper end of the support base based on the installation state of the upper precast slab 50 In addition, the slab rotation boundary (R2) is certainly larger than the slab rotation limit boundary (R1), so that (R1 <R2) can not be installed more.

That is, when the upper precast slab 50 is disposed in the longitudinal direction similarly to the intermediate precast slab 40, and then horizontally rotated in the horizontal direction, both ends are supported by the intermediate support ends 25 and 26.

It can be seen that both ends of the rectangular upper precast slab 50 are interfering with the inner surface of the tunnel and thus cannot be rotated to the position of the final intermediate supporting end.

Therefore, in the large diameter tunnel installed underground, the development of the precast slab installation method that can be installed without the slab interference on the inner surface of the ellipse or circular large diameter tunnel in the horizontal rotation of the precast slab horizontally installed Was required.

Therefore, the present invention is to install the support end on the inner surface of the tunnel in a circular or elliptical tunnel installed in a large diameter underground, and also to install the precast slab horizontally horizontally installed on the support end (multilayer underground tunnel Technical Solution to solve the provision of a method for installing a precast slab in a large diameter tunnel that can be easily installed in the large diameter tunnel by preventing the inner surface of the tunnel according to the upper, middle, lower) to interfere with the rotation of the precast slab side end It is a task.

Accordingly, the present invention is to prevent the slab interference on the inner surface of the ellipse or circular large diameter tunnel in the horizontal installation of the precast slab horizontally in the large diameter tunnel to be installed underground,

First, the shape of the precast slab was modified.

Accordingly, the precast slab has a horizontal cross-sectional shape in a parallelogram shape so that the other side end portion E is not positioned on the same line as the one side end portion on the horizontal line as shown in FIG. 2. The manufactured one was to be used.

Thus, when the precast slab is transported in the longitudinal direction and then horizontally rotated horizontally from the upper end of the support, in the conventional rectangular precast slab, the side end portion does not interfere with the tunnel inner surface.

Second, since the precast slab is manufactured to extend in the lateral direction, it receives a large bending moment in the center part, and thus, the precast slabs located at the top and the bottom of the tunnel ceiling and the bottom are stably used by using a support member in the form of a vertical member. To be supported.

Third, the precast slab is divided into a plurality of segments in the transport and installation to be used to be assembled and connected in the underground tunnel, the precast slab is to be supported both ends by the support end of various forms, One made with half or full precast products could be used.

According to the present invention, it is possible to install a slab in multiple layers more easily in a large-diameter tunnel to be constructed underground, thereby enabling efficient and economical large-diameter underground tunnel construction.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1A is a cross-sectional view of a multilayer underground tunnel installed in a conventional underground and a perspective view of a precast slab used in the multilayer underground tunnel;
Figure 1b is a planar rotational view showing the rotational state of the lower precast slab in a conventional multi-layer underground tunnel,
Figure 1c is a planar rotational view showing the rotational state of the intermediate precast slab in the conventional multi-layer underground tunnel,
Figure 1d is a planar rotational view showing the rotational state of the upper precast slab in the conventional multi-layer underground tunnel,
2A, 2B and 2C are perspective views of embodiments of the precast slab according to the present invention.
3A, 3B and 3C are cross-sectional views of lateral connections of a segment precast slab according to the present invention;
4A, 4B, 4C and 4D are cross-sectional views of embodiments of the support end of the precast slab according to the present invention;
5A, 5B and 5C are installation views of the lower, middle and upper precast slabs according to the present invention.
6 is a modified installation of the upper slab point portion according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

<Precast slab 100 of the present invention>

First, as shown in FIG. 1C, when the lower precast slab is installed between the lower support ends 21 and 22, the rectangular precast slab may be used as it is.

The precast slab installed in the lower part of the large diameter multilayer tunnel is also applied to the precast slab according to the present invention because it is economical to manufacture and use a large amount of precast slab in the same form.

Thus, look at the precast slab 100 according to the present invention first.

According to Figure 2a can be seen an example of the precast slab 100 according to the present invention, the width of the transverse width (B1) so that both side ends (D, E) can be supported on the upper support end of the tunnel inner surface It can be seen that the structure having a panel shape having a width (B2) extending in the longitudinal direction.

This basically produces a reinforced concrete member.

At this time, looking at the overall shape of the precast slab 100, unlike the conventional slab of the rectangular shape, as shown in Figure 2a to prevent the side end portion of the precast slab to interfere with the inner surface of the tunnel, the precast slab It can be seen that the other side end portion is manufactured in a parallelogram shape so that the other side end portion is not located on the same line as the one side end portion in the horizontal line on the basis of one side end portion supported by the support end of one tunnel inner side surface.

That is, one side end portion and the other side end portion is to be formed in parallel with each other, the body portion 110 between the side ends (D, E) can be seen that the overall shape is formed in a parallelogram.

2b and 2c are modifications of the precast slab 100 according to the present invention. Still another precast slab is transverse to the other side with respect to one side end supported by the support end of one tunnel inner surface. It can be seen that the parallelogram is manufactured so as not to be located on the same line as the one side end portion in the direction line.

However, in the case of Figure 2b it can be seen that formed in the body portion 110 is divided into a horizontal portion 111 and the inclined portion 112,

In the case of FIG. 2C, it can be seen that the body portion 110 is formed to be divided into a horizontal portion 111 and an inclined portion 112, and a central portion of the body portion 113 is stepped 113.

As such, when the precast slab 100 is installed to be stepped in the longitudinal direction, the coupling of the precast slab 100 is strengthened by the shearing action of the precast slab 100 in the longitudinal direction, and when the tension is caused by a steel bar or a strand When installed in the unit 111 can meet perpendicular to the load introduction direction to prevent the staggered deformation of the slab and the slab is possible to install a more stable continuity of the integrated behavior.

In addition, the separation block 140 may be further installed on the upper surface for lane separation, and both side ends D and E may be formed in a cross section having a thicker thickness because the load is concentrated.

Furthermore, although not shown, it is preferable to further install a tension member or steel rod penetrating the precast slab 100 in the longitudinal direction in order to improve the connection performance of each other in the longitudinal direction of the precast slab 100.

In addition, as shown in FIG. 3a, when there are spatial constraints in transportation and installation in the transverse length of the precast slab 100, the precast slab 100 is made of a plurality of segment precast slabs 100, 200, and 300 connected to each other. You can.

For example, the inner reinforcing bars 410 of the segment precast slabs 100, 200, and 300 are protruded to the outside, and the inner reinforcing bars of the adjacent segment precast slabs 100, 200 and 300 are connected to each other and then connected to each other. By pouring 420, a plurality of segment precast slabs 100, 200, and 300 may be connected to each other.

In addition, as shown in FIG. 3B, a shear key 430 and a shear groove 440 are formed on the connection end surfaces of the segment precast slabs 100, 200, and 300, and adjacent segments, for example, the segment precast slabs 100, 200, and 300 are joined to each other. After forming separate transverse through holes 450 in each of the slabs, inserting the transverse tension member 460 to penetrate the through holes, and then tensioning at the end to fix the plurality of segment precast slabs (100, 200, 300). ) Can be connected to each other.

Furthermore. As shown in Figure 3c, the segment precast slab (100,200,300) is bonded to each other using a shear key and a shear groove,

The internal reinforcing bar is protruded on the upper surface of the segment precast slab (100,200,300) to produce a half-segment precast slab (100,200,300) in the form of a half section (for example, 'ㅗ' cross-sectional shape),

Additional slab concrete may be finalized before or after installation to support the final supporting end to produce the final precast slab.

4A, 4B, 4C, and 4D, examples of the support end 500 on which one side portion D and the other side portion E of the precast slab 100 according to the present invention are supported can be seen. have.

That is, according to Figure 4a, to form the inner reinforcement 510 protruding from the inner surface of the tunnel, and to form the supporting concrete 520 so that the inner reinforcement 510 is embedded to form one side portion of the precast slab 100 and An example in which the other side portion is supported by the slab support 530 can be seen.

That is, according to Figure 4b, the inner side of the pre-cast slab (100) to form the inner reinforcing bar 510 protruding to the inner surface of the tunnel, and the supporting steel 540 to be fixed to the inner reinforcing bar 510 and You can see an example that the other side portion is supported using the slab support (530),

According to FIG. 4C, one side portion and the other side portion of the precast slab 100 are formed by forming an inner reinforcing bar 510 protruding from the inner surface of the tunnel and forming a supporting steel 540 to be fixed to the inner reinforcing bar 510. One side portion and the other side portion of the final precast slab 100 may be confirmed to be connected to each other by anchors and side concretes 560 and 570 protruding laterally on the inner surface of the tunnel.

That is, according to Figure 4d, to form the inner steel reinforcing bar 510 protruding to the inner surface of the tunnel, the upper steel reinforcing bar 550 is formed to be fixed to the inner reinforcing bar 510, and After forming the supporting concrete 520 so that only the supporting steel 540 is embedded, one side portion and the other side portion of the precast slab 100 is formed on the inner side surface of the final tunnel by the upper connecting bars 550. You can see an example that is connected to each other by).

<Installation method of precast slab 100 of the present invention>

First, the large-diameter underground tunnel is constructed first. In general, vertical tunnels are formed at the tunnel starting point and the end point, and the tunnels are connected to each other to form vertical tunnels connecting the starting point and the end point.

When the underground tunnel of the elliptic or elliptical cross section is completed, a longitudinally extending slab is formed in multiple layers as shown in FIGS. 1A, 5A, 5B, and 5C, which vary depending on the cross-sectional size of the underground tunnel. In the following, we look at the multi-layer large-diameter underground tunnel formed in three layers.

First, prior to installing the lower precast slab A on the basis of FIG. 5A, the support ends 500 of the various types described above are first installed on both inner surfaces of the lower part of the tunnel.

Accordingly, the lower precast slab 600 is transported into the underground tunnel, and then horizontally rotates horizontally from the upper end of the support end 500 so that one side end and the other end end are supported on the upper end of the support end 500. Will be installed.

Since the lower precast slab 600 has a slab rotation limit R1 larger than the slab rotation boundary R2 as shown in FIG. 5A (R1> R2), the lower precast slab 600 is formed by the horizontal horizontal rotation of the lower precast slab 600. The installation is otherwise no problem.

Of course, the lower precast slab 600 may use the slab according to FIGS. 2A to 2C, and a plurality of segment precast slabs connected to each other may be used as illustrated in FIGS. 3A and 3B. It is possible to use the support end 500 as shown in Figures 4a to 4d.

Next, when the lower precast slab 600 is completed as shown in FIG. 5B, the intermediate precast slab 700 is installed in the middle of the tunnel outline.

The support end 500 is also installed on the inner side of the tunnel, and the intermediate precast slab 700 is transported into the underground tunnel, and then horizontally rotated horizontally above the support end 500 to support the support end ( 500) is installed so that one side end portion and the other side end portion are supported on the upper portion.

As described above, the intermediate precast slab 700 has a larger slab rotation boundary R2 than the slab rotation limit boundary R1 (R1 <R2), but the shape of the intermediate precast slab 700 is shown in FIGS. 2A to 2C. Since it is formed in a parallelogram shape as described above it can be installed so that the side end portion does not interfere with the inner surface during rotation.

Finally, when the intermediate precast slab 700 is completed as shown in FIG. 5C, the upper precast slab 800 is installed on the upper part of the tunnel.

Also, the support end 500 is installed on the inner surface of the tunnel, and the upper precast slab 800 is transported into the underground tunnel, and then horizontally rotated horizontally from the support end 500 to the support end ( 500) is installed so that one side end portion and the other side end portion are supported on the upper portion.

The upper precast slab 800 also has a slab rotation boundary R2 larger than the slab rotation limit boundary R1 (R1 <R2), but the shape of the upper precast slab 800 is as shown in Figs. 2A to 2C. Since it is formed in a parallelogram shape, it can also be seen that the side end portion is not interfered by the inner surface during rotation.

In addition, in the case of the upper and lower precast slabs (800,600), by installing a middle partition (900) extending from the top and bottom of the slab outline central tunnel and the bottom, the upper and lower precast slab to be installed more stably To make it possible.

The upper and lower ends of the intermediate partition wall 900 in the form of a vertical plate form the intermediate partition wall by using the connecting hardware 910 and the anchor bolt 920.

Furthermore, the lower, middle, and upper precast slabs are continuously installed in the longitudinal direction. When all of the multilayer slabs are completed, a paving layer or the like may be installed on the upper surface of the slab so that the vehicle may pass.

Furthermore, as shown in FIG. 6, when the joints of both side end portions D and E of the upper precast slab are installed in the opposite direction of gravity, the rectangular upper slab 50 is installed.

That is, the side end portions D and E of the upper precast slab are formed to be stepped, but the horizontal length of the upper side end portion D2 is shorter than the lower side end portion D1, and the support end 500 corresponding thereto. If the lower and upper side end portions (D1, D2) to bite each other, it is possible to use a rectangular upper precast slab rather than a parallelogram upper precast slab as in the present invention.

At this time, the upper and lower end portions can be more securely mechanically fastened with each other using the anchor bolt 910 using the support end.

100,200,300: precast slab
410: internal reinforcement 420: concrete or non-contraction concrete
430,440: shear key, shear groove
450, 460: transverse through-holes, transverse tension
500: support
600: lower precast slab
700: intermediate precast slab
800: upper precast slab 900: intermediate bulkhead

Claims (4)

Installing support ends on the inner side of the large-diameter tunnel having an elliptical or circular cross section facing each other on the same transverse line; And installing both side ends of the precast slab between the support ends such that the side ends of the precast slab are continuously connected in parallel to each other in the longitudinal direction of the tunnel, in order to prevent the side ends of the precast slab from interfering with the inner surface of the tunnel. The precast slab has a cross sectional shape formed in a parallelogram shape so that the other side end E is not positioned on the same line as the one side end on the horizontal line with respect to the one side end D. To ensure that
The support end is a concrete support portion formed so that the connection reinforcing bar projecting on the inner surface of the tunnel; Or a steel support fixed to the connecting reinforcing bar protruding from the inner side of the tunnel; to support the bottom of both ends of the precast slab to the concrete or steel supporting part, or the steel support fixed to the connecting reinforcing bar protruding from the inner side of the tunnel. A precast slab is installed in a large-diameter tunnel, characterized in that both ends of the precast slab are supported by the portion, and the inner surface of the tunnel and both side ends of the precast slab are formed integrally with each other. The precast slab of claim 1, wherein the precast slab of the large-diameter tunnel is formed in multiple layers.
Any one of the precast slabs formed in the multilayer,
Side end portions (D, E) of the precast slab are formed to be stepped, but the horizontal length of the upper side end portion (D2) is shorter than the lower side end portion (D1), and the corresponding support end 500 is lower and It is characterized in that it can be used to combine the parallelogram shape and the rectangular precast slab so as to bite with the upper side end portions (D1, D2),
Precast slabs located in the upper and lower portions are installed so that the central portion is supported by the middle partition formed in the ceiling and the bottom portion pre-cast slab method for installing a large diameter tunnel. delete The method of claim 1, wherein the precast slab is produced by connecting the segment precast slab to each other in the transverse direction,
The segment precast slab may be connected to: a connecting bar protruding from a connecting end surface of the segment precast slab; Or a shear key and a shear groove formed on the connection end surface of the segment precast slab.
The segment precast slab is provided with a precast slab in a large-diameter tunnel, characterized in that to use a half precast slab completed by pouring concrete after the internal reinforcing bar is projected to the upper surface, to form a slab of a certain thickness Way.

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