JP2686486B2 - Construction method of reinforced concrete lining in non-segment shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" A tunnel is constructed by lining a wall of a pit formed in the ground by digging a shield machine without using a segment to construct a tunnel. A method for constructing a reinforced concrete lining in the segment shield method.

"Conventional technology and its problem" As a conventional method of constructing a reinforced concrete lining in a shield tunnel of this type, a reinforcing bar divided into 3 to 4 in the circumferential direction is carried into the mine, and then these are arranged at predetermined positions. A method is known in which these are manually bound and assembled into an annular shape.

However, in the above-mentioned conventional method of constructing a reinforced concrete lining in a shield tunnel, the work efficiency is not good because the rebar is assembled inside the mine directly along the wall of the mine. Since it is assembled inside the mine, it is difficult to secure the position of the reinforced bars, and there is a risk that the assembled reinforcing bars will shift when placing concrete, and all the assembly work is manual work, which is dangerous. There were problems such as attendance.

The present invention has been made in view of the above problems, and it is possible to perform the work of assembling the reinforcing bar efficiently, and to perform the work completely by minimizing the manual work occupying the reinforcing bar assembling work. The purpose of the present invention is to provide a method for constructing a reinforced concrete lining in the non-segment shield construction method in which the position of the assembled reinforcing bar does not shift when pouring concrete.

"Means for Solving the Problem" The present invention, in order to solve the above problems, after arranging the reinforcing bars in a predetermined shape on the inner peripheral surface side of the outer formwork on the ground,
The outer formwork and the inner formwork are integrated by a connecting member, and then the inner formwork and the outer formwork thus integrated are assembled in an annular shape along the wall surface of the pit, and at the same time, the inner formwork is formed. It is configured such that the formed reinforcing bar is divided between the inner and outer molds to connect the rebar.

"Operation" In the present invention, after reinforcing bars are arranged on the inner peripheral surface side of the outer formwork in advance on the ground, the inner formwork is integrated inside the outer formwork. It is possible to efficiently perform the bar arrangement between the inner formwork and the bar, and to reliably arrange the reinforcing bar at the correct position. Therefore, when pouring concrete, the reinforcing bars arranged in the formwork are not displaced. Further, since the manual work at the site is only the work of connecting the reinforcing bars that are divided into the respective molds and arranged, the worker can perform the work completely.

Hereinafter, the present invention will be described with reference to the drawings. 1 to 11 show an embodiment of a method for constructing a reinforced concrete lining in the non-segment shield construction method of the present invention.

In the figure, reference numeral 1 is a shield machine, and at the rear portion of the skin plate 2 of the shield machine 1, the inner surface of a mine 3 excavated by the shield machine is lined with a concrete lining 4, and the shield machine 1 is a jack. Is driven to apply a reaction force to the hardened portion of the concrete lining 4 through the inner formwork 7 to propel it.

As shown in FIG. 2, the concrete lining 4 is formed in an annular shape along the wall surface of the mine that is excavated in the rear part of the shield machine 1 that is digging. And an outer formwork 6 having a predetermined width in the longitudinal direction of the pit. Also, on the inner peripheral surface side of the concrete lining 4,
An inner mold 7 having a predetermined width in the digging direction of the pit is provided at a position facing the outer mold 6 in the circumferential direction, and the outer mold 6 and the inner mold 7 are provided. Means that they are integrated with a predetermined gap by a connecting member 6a fixed to the inner peripheral surface side of the outer mold frame 6.

As shown in FIG. 2, the formwork in this embodiment has a K formwork located on the ceiling of the mine, B1 and B2 formworks on both sides of the formwork, and four A formworks on the side and bottom. It is divided into seven parts. And between the outer mold 6 and the inner mold 7,
A main bar 8 arranged in the circumferential direction of the mine and a force distributing bar 9 arranged in the digging direction of the mine are arranged.

As shown in FIGS. 3 to 5, the main bar 8 is divided into a predetermined length between inner and outer molds formed in a predetermined shape, and is formed in an arc shape. The main bars 8, 8 ... Connected in the circumferential direction are
Lap muscles 8a, 8a, ... Which connect the respective main muscles 8, 8 ,. Further, the distribution muscle 9 is arranged between the inner and outer molds along the excavation direction of the mine, and one end of the distribution muscle 9 is on the face of the outer mold (X side in FIG. 5). ) Is located at substantially the same location as the end face, and the other end is arranged so as to project to the tail side (Y side in FIG. 5) by a predetermined length so that the joint part in the digging direction of the mine is formed. Is forming. The main reinforcement 8 and the distribution muscle 9 are fixed to the connecting member 6a at an intermediate position between the outer mold and the inner mold, and both ends of the main reinforcement 8 are washers for fixing the lap reinforcement 8a. 10a is provided. Further, the force distribution muscle 9 and the joint portion of the force distribution muscle 9 attached to the inner and outer formwork arranged in front are connected to the face of each of the force distribution muscles 9, 9 ,. Washers for
10b is provided. And these washers 10a, 10b
The shape of is an ellipse that is twice the outer diameter of the reinforcing bar used and α.

6 to 8 show an example in which the main bar 8 and the force distributing bar 9 are attached between the outer mold 6 and the inner mold 7 by using a spacer. A connecting member 6a is fixed to the inner peripheral surface of the outer mold 6, and further, as shown in FIG. 6, a connecting member 6a is arranged on the inner peripheral surface of the outer mold 6 in the circumferential direction. A force distribution spacer 11 is fixed along the same. Further, as shown in FIG. 8, main bar spacers 12 are fixed at predetermined intervals of the outer mold 6 along the digging direction of the pit. The spacers 11 and 12 are formed, for example, by bending round steel into an elliptical shape slightly larger than twice the outer diameter of the reinforcing bar, and using the round steel of the same diameter on both sides of the outer form 6, It is designed to be welded to ribs and legs on the inner peripheral surface.

Next, a method for constructing the reinforced concrete lining of this embodiment will be described with reference to FIGS. 9 to 11.

(I) First, on the ground, the main reinforcement 8 and the force distribution reinforcement 9 are arranged on the inner peripheral surface side of the outer mold 6 so as to have a predetermined shape, and after the washers 10a and 10b are attached, the outer mold 10 is attached. The inner frame 7 is connected to the inner peripheral surface side of 6 by a connecting member 6a.

In addition, the lap muscle 8a arranged in the connecting portion of the main muscle 8 is
It is arranged along the main bar 8 located on the side of the window 13 (see FIG. 11 (b)) formed in the inner mold 7. Further, the main reinforcement 8 arranged at the position of the K form is incorporated in the B2 form as shown in FIG. 10 (a).

(Ii) Then, as shown in FIGS. 9 (a) and 9 (b),
Using the erector (not shown) of the shield machine, the inner and outer molds 6 and 7 which are internally reinforced and integrated are put in place (in this embodiment, A form → B1 form → B2 Form → K form and ring form from the bottom side of the mine). At that time, the new distribution muscle 9 and the existing distribution muscle 9 are connected by inserting the distribution muscle 9 into the washer 10b attached to the distribution muscle 9 installed in the existing outer formwork 6. . In addition, power distribution muscle 9
After assembling one ring of the formwork, washers 10
It may be inserted into b and connected to the existing distribution muscle 9.

(Iii) Then, as shown in FIG. 10 (b), after assembling one ring of each A, B, K form on the inner peripheral surface of the pit, as shown in FIG. 11 (b). , Inserting a hand through a window 13 formed on the inner peripheral surface of the inner mold frame 7, pushing a lap streak 8a disposed inside in advance to a connecting portion of each mold, and the main stirrup bars are connected by the lap streak 8a. Connect.

(Iv) Finally, as shown in FIG. 10 (b), after installing the K formwork on the ceiling part using the erector, as shown in FIG. 10 (c), it was assembled in the B2 formwork. Oita main line 8
Insert your hand through the window 13 formed in the inner form 7,
By extruding to the K form side, the bar is arranged at a predetermined position.

(V) In the following, the above process is performed with a predetermined number of rings, for example, 4
After having been installed along the inner surface of the mine 3 by the amount of the ring, concrete C is filled from the inside of the inner formwork 7 between the outer formwork 6 and the inner formwork 7 as shown in FIG. , Lining the wall of mine 3.

(Vi) After the concrete C cast in the formwork is hardened, the inner formwork 7 is removed from the inside of the cast concrete to form a tunnel in which the wall of the mine is lined with concrete. .

As described above, in the method of constructing the reinforced concrete lining in the non-segment shield construction method of the present embodiment, the main reinforcement 8 and the force distribution reinforcement 9 are arranged in a predetermined shape on the inner peripheral surface side of the outer formwork 6. After that, the outer mold 6 and the inner mold 7 are connected to each other by the connecting member 6a.
After being integrated with each other, these integrated outer mold 6 and inner mold 7 are assembled in a ring shape along the wall surface of the pit 3 and each main bar 8 is formed from the window 13 formed in the inner mold 7. By extruding the wrap bar 8a previously arranged in the above, the main bar 8 which is divided into the outer molds and connected to each other is connected, so that the outer mold and the inner mold are separated from each other. In addition to being able to efficiently perform the bar arrangement, the main bar 8 and the force distributing bar 9 can be arranged in an accurate position and reliably. Therefore, when the concrete C is placed in the formwork, the main reinforcement 8 and the force distribution reinforcement 9 arranged in the formwork are not displaced. Further, since the manual work at the site is only the connecting work of the main reinforcement 8 and the distribution muscle 9 which are divided and arranged in each formwork, the worker can safely perform the work.

"Effects of the Invention" As described above in detail, in the method of constructing a reinforced concrete lining in the non-segment shield construction method of the present invention, in the ground, iron members are arranged inside the outer formwork in advance. After that, since the inner formwork is integrated inside the outer formwork, the rebar can be efficiently arranged between the outer formwork and the inner formwork, and the rebar is positioned accurately. In addition, it is possible to arrange the bar reliably. Therefore, when pouring concrete, the reinforcing bars arranged in the formwork are not displaced. In addition, since the work on the site is only the work of connecting the reinforcing bars arranged in the connection parts of each formwork from the window part formed in the inner formwork, the worker can safely perform the work. There is an effect that can be done.

[Brief description of the drawings]

1 to 11 show a method for constructing a reinforced concrete lining in a non-segment shield of the present invention, and FIG. 1 is a longitudinal sectional view of a shield tunnel constructed by the method of the present invention. Figure 2 shows II-II in Figure 1.
FIG. 4 is a cross-sectional view showing a cross section of the shield tunnel, FIG. 3 is a front view of an outer mold and an inner mold having reinforcing bars arranged inside, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. FIG. 5 is a side sectional view of an outer mold and an inner mold having reinforcing bars arranged therein, FIG.
The figure shows the VV cross section of FIG. 3, and is a plan view of the inner formwork in which the reinforcing bar is arranged inside, and FIGS. 6 to 8 show the reinforcing bar using the washer in the formwork. FIG. 6 is a front view of the formwork, FIG. 7 is a plan view of FIG. 6, FIG. 8 is a side sectional view of FIG. 6, and FIG. 9 is along the wall of the pit. FIG. 9 is a view showing that the mold is being assembled by
Figures (a) and (b) are side sectional views of the pit, and Figure 10 (a) and
10 (b) and 10 (c) are views for explaining the process of assembling the mold wheel on the wall of the mine. FIG. 10 (a) is a front view of the mold, and FIG. 10 (b) is a K mold. Front view of the mold with the frame installed, Fig. 10 (c) is a front view of the mold showing the main reinforcement of the K form, and Figs. 11 (a) and (b) are Fig. 11 (a) is a cross-sectional view showing a connecting portion of the form, in which Fig. 11 (a) is a cross-sectional view showing a state in which a wrap streak disposed on the window side is fitted to the main bar, and Fig. 11 (b) shows that the hand is inserted from the window It is a figure which shows the state which connected the main muscles with the lap muscle. 1 ... Shielding machine, 6 ... Outer form, 6a ... Connecting member, 7
…… Inner form, 8 …… Main reinforcement, 9 …… Strength reinforcement, 8a …… Rap reinforcement, 13 …… Window, C …… Concrete.

Claims (1)

(57) [Claims] 1. An inner formwork and an outer formwork, each having a predetermined width divided into a plurality of parts, are assembled along a wall surface of a pit formed at the rear part of a shield machine to be excavated into a tubular shape while being integrated by a connecting member. After that, in the non-segment shield construction method in which concrete is placed between the inner formwork and the outer formwork and concrete lining is applied, a predetermined amount is provided on the inner peripheral surface side of each outer formwork on the ground. After arranging the reinforcing bars in a shape, the outer formwork and the inner formwork are integrated with a connecting member, and then the integrated inner formwork and outer formwork are annularly assembled along the wall surface of the pit. At the same time, a method for constructing a reinforced concrete lining is characterized in that the rebars that are reinforced by being divided between the inner and outer molds are connected to each other through the window formed in the inner mold.