JPH07111117B2 - Cast-in-place lining method using mesh line in non-segment shield method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cast-in-place lining method using mesh reinforcement in a non-segment shield construction method for lining walls without using segments in shield construction. .

"Prior art" First, as one of the methods for constructing a tunnel using a shield machine, the applicant of the present invention has a non-segment shield construction method (hereinafter referred to as " NSS method ").

This method is to assemble a plurality of divided inner molds and outer molds with a predetermined width along the wall surface of a mine that has been dug by a shield machine into a cylindrical shape while integrating them, and then to form the inner and outer molds. After a certain number of consecutively installed along the excavation direction of the mine,
Concrete was placed between the inner mold and the outer mold to give a concrete lining, and when the solidified portion of the concrete lining reached a predetermined length, the concrete was lined inside the concrete lining. After disassembling the inner formwork behind the inner formwork from the outer formwork one after another,
By diverting it as an inner formwork to be assembled on the newly excavated wall surface, a tunnel will be built underground.

Therefore, in this NSS method, concrete lining is applied to the primary lining to complete the tunnel, and the solidified concrete lining supports long-term loads such as soil water pressure received from the ground and also when the shield machine is propelled. Since it is also responsible for jack thrust (short-term load), the outer formwork embedded in the concrete becomes inexpensive, eliminating the need for expensive segments as lining material, and as concrete for secondary lining. No lining is required, and the construction period can be shortened and the construction cost can be greatly reduced.

Therefore, in the NSS method, the strength of the concrete lining is a very important problem, and it is desirable to reinforce the concrete lining to improve its strength. However, in the conventional cast-in-place lining method of shield construction, a method of arranging reinforcing bars inside the concrete lining has not been taken.

Therefore, the present applicant has applied a conventional cast-in-place concrete construction method to the NSS construction method and considered a cast-in-place lining method in the NSS construction method as shown in FIGS. 8 to 14.

In FIG. 12, reference numeral E is a natural ground around which a tunnel is built, and the ground E is excavated by the shield machine 1. Behind the shield machine 1, an inner formwork 2 and an outer formwork 3 each having a predetermined width divided into a plurality in the circumferential direction along the wall surface of the mine H excavated thereby are assembled in an annular shape, and Inner mold 2 and outer mold 3 at regular intervals in the direction
A wife frame 4 is attached between the and. A ring reinforcement (main reinforcement) 5 and a force distribution reinforcement 6 are incorporated between the inner mold 2 and the outer mold 4, and concrete C is struck between the rear inner and outer molds. It has been set up.

Then, in order to assemble the reinforcing bars 5 and 6 between the inner and outer molds, first, as shown in FIG. 8, the ring reinforcing bar 5 is circumferentially 5a, so as to have an overlapping portion of a predetermined length at both ends. 4 in 5b, 5c, 5d
I'm trying to divide it and assemble it. In order to bind the overlapping portions of the reinforcing bars 5a, 5b, 5c, 5d, a window (not shown) is provided in the inner formwork 2 in which the overlapping portions are located.

Next, as shown in FIG. 13, the inner mold frame 2 and the outer mold frame 3 are divided into seven in the circumferential direction, and these are assembled from the bottom. First, as shown in FIG. 10, two inner molds 2A, 2A and outer molds 3A, 3A at the bottom are connected in the circumferential direction,
The ring streak 5a is arranged inside and fixed to the spacer 7 (see FIG. 14). After the ring muscle 5a is assembled to the spacer 7, the ring muscles 5b and 5c are arranged inside the mold. Next, after arranging the ring streaks 5b and 5c in the molds 2A and 3A, as shown in FIG. 9, two inner molds 2A and 3A are arranged in series.
Further, the inner and outer molds 2A, 3A and 2B, 3B connected by the spacer 7 are assembled on both sides of each. Inner / Outer Form 2
After assembling A, 3A, 2B, 3B, the bottom inner and outer molds 2A, 3
The ring muscles 5b and 5c arranged in A are pulled out to a predetermined position and assembled to the spacer 7. Then, after the ring reinforcements 5b, 5c are assembled to the spacer 7, the ring reinforcements 5d are arranged in the inner / outer molds 2B, 3B. Finally, after assembling the inner and outer molds 2K and 3K at the top between the inner and outer molds 2B and 3B, the ring muscle 5d is slid and bound to the ring muscles 5b and 5c.

Next, as described above, the inner and outer formwork 2 and 3 assembled in an annular shape are continuously provided for four rings in the tunnel excavation direction. And the last (4th ring) formwork, as shown in FIG. 13 and FIG. 14, is a gable frame 4 divided into 7 parts (4A, 4A, 4A, 4A, 4B, 4B, 4K) in the circumferential direction. Using the outer mold 3 which is fixed in advance in advance,
Assemble in a ring. The end portion of the gable frame 4 is fixed at a position slightly displaced inward from the end of the outer formwork 3 due to the problem of water stoppage, and the gable frame fixing plate 4a is fixed to the inner peripheral portion thereof. . The gable frame fixing plate 4a is a cone-shaped protrusion that is a mounting portion of a spacer 7 that connects the inner mold 2 and the outer mold 3.
The end portion of the spacer 7 is fixed to the 2a by a bolt 8. The inner molds 2 and 2 are connected to each other in the tunnel excavation direction by bolts 9, and the outer molds 3 and 3 are connected from inside by a stopper 11 via a seal member 10.

Then, after the inner and outer molds 2 and 3 are continuously connected for 4 rings (1 stroke), as shown in FIG. 11, the inner and outer molds 2 and 3 for 1 ring are further assembled in an annular shape. Then, from the shield machine 1 side, through holes 12, 12, ...
(Refer to Fig. 13), the force distribution muscles 6, 6, ... are fed and arranged. The through holes 12 formed in the end frame 4 are provided at the same pitch as the bolt holes 9a for connecting the inner formwork 2, and the force distribution bars 6, 6, ... Arranged in the formwork, An operator puts his hands through a window (not shown) formed in the inner formwork 2 and binds to the ends of the force distribution muscles 6,6, ... and the ring muscles 5,5 ,. I am trying.

Then, as described above, after the ring muscles 5 and the force distribution muscles 6 have been arranged inside the inner and outer molds 2 and 3, as shown in FIG. By placing concrete C by the installation pipe 13, a concrete lining having reinforcing bars arranged therein is applied.

"Problems to be solved by the invention" However, in the cast-in-place lining method in the non-segment shield construction method, the ring streak divided into 4 is used.
5, ... and distribution muscles 6,6, ... must be arranged one by one in the formwork and tied together, which requires a great deal of time and labor, and delays the construction period. And an increase in construction costs, and a rebar insertion port and a working window for that purpose must be formed at a predetermined place on the inner formwork, which causes an increase in the cost of manufacturing the inner formwork. There are problems such as becoming.

The present invention has been made in view of the above-mentioned problems, and it is possible to easily and quickly arrange the reinforcing bars in the formwork, and the work window necessary for binding the reinforcing bars to the inner formwork. It is an object of the present invention to provide a cast-in-place lining method using a mesh streak in the non-segment shield construction method, which can shorten the construction period and the construction cost by eliminating the need for.

[Means for Solving Problems] In order to solve the above-mentioned problems, the present invention provides a method for integrating an inner mold and an outer mold with a space between the inner mold and the outer mold. When arranging mesh streaks, and then assembling the outer formwork and the inner formwork along the wall surface of the mine in the circumferential direction and in the tunnel excavation direction to assemble them in a tubular shape, the connecting portion thereof Between the inner form frame and the outer form frame, a mesh reinforcement for overlapping connection for arranging both adjacent mesh reinforcements to connect the mesh reinforcements is arranged.

[Examples] Hereinafter, the present invention will be described with reference to FIGS. 1 to 7.
These figures show an embodiment of the cast-in-place lining method using mesh streaks in the non-segment shield construction method of the present invention. In these figures, the same components as those shown in the above-mentioned prior art are designated by the same reference numerals, and the description thereof will be omitted.

First, the schematic structure of the construction method of the present invention will be described with reference to FIG. A mine H is formed in the ground E by being excavated by the shield machine 1, and along the wall surface of the excavated mine H, the inner mold 2 and the outer mold are formed by the erector 1a at the rear of the shield machine 1. The frame 3 and the frame 3 are assembled in a tubular shape. A mesh streak 20 is arranged between the assembled inner and outer molds 2 and 3, and between the inner and outer molds 2 and 3 divided by the end frames 4, 4. Concrete C is placed by the placing pipe 13.

Next, a cast-in-place lining method using mesh streaks in the non-segment shield construction method of the present invention will be described.

(I) First, as shown in FIGS. 1 (a) and 1 (b), reference numeral 2 is an inner frame in which the skin plate 2s is formed in an arc shape, and a bolt 8 is provided at a predetermined position of the skin plate 2s. Through holes (not shown) are formed. Further, a cone-shaped protruding member 2a having a bolt hole communicating with the through hole is fixed to the outer peripheral surface of the inner mold form 2. Further, reference numeral 3 is an outer formwork in which the skin plate 3s is formed in an arc shape similarly to the skin plate 2s, and the inner peripheral surface of the outer formwork 3 has a connecting member 7 having a female screw formed at the tip thereof. 7, ... is fixed. Further, reference numeral 20 is a mesh streak, and the skin plate of the inner mold form 2 or the outer mold form 3 has been previously formed in another place.
Ring muscle (main muscle) 20a and distribution muscle 20 according to the shape of 2S, 3S
It is manufactured by assembling a predetermined number of b and grids, and the ring reinforcement 20a and the distribution muscle 20b use structural rebars having sufficient strength.

When the inner mold 2 and the outer mold 3 are connected and integrated, first, the mesh streak 20 is arranged so as to be parallel to the skin plate 3s of the outer mold 3 at a constant interval. After that, it is fixed to the connecting member 7. Then, after the tip of the connecting member 7 of the outer mold 3 to which the mesh streak 20 is attached is brought into contact with the tip of the protruding member 2a of the inner mold 2, from the inner peripheral surface side of the inner mold 2. The bolt 8 is inserted, and then the tip end of the connecting member 7 is screwed to be connected to form a space S therebetween. In this way, the inner mold form 2 and the outer mold form 3 are connected to each other, and the mesh streaks 20 are arranged therein. In addition, the mesh streak 20 includes the inner mold 2 and the outer mold 3.
At both ends A (outside of the connecting member 7) in the circumferential direction of
Make sure that at least 3 pieces (2 spans) of 20b are arranged.

(Ii) Next, the inner formwork 2 and the outer formwork 3 which are integrated are assembled in an annular shape at the rear part of the shield machine 1 by using the erector 1a (hereinafter, one annularly assembled formwork is referred to as an “annular shape”). Abbreviated as "body").

In order to assemble it in a ring shape, first, as shown in FIG. 5, the inner and outer molds 2A, 3A in which the mesh muscles 20 are arranged are assembled from the bottom. At that time, the mesh muscle 21A for polymerization connection,
It is arranged between the inner formwork 2A and the outer formwork 3A of the connecting portion, and the mesh muscles 21A for superposition connection are adjacent to each other.
Overlay on both 0 and 20. In this case, the overlapping connecting mesh muscle 21A is mainly for connecting the ring muscle (main muscle) 20a, and as shown in FIG.
The a and the muscles 21b are assembled in a grid pattern. Next, as shown in FIG. 5, after the mesh line 21B for superposition connection is arranged at the upper left of the inner / outer molds 2A, 3A (to the paper surface), another inner / outer mold which is integrated 2A and 3A are the inner and outer molds 2
Assemble and connect while sliding to the side of A, 3A.
In the same manner, after placing the mesh connection mesh 21C on the upper right of the inner / outer molds 2A, 3A at the bottom, the other inner / outer molds 2A, 3A integrated with the inner / outer mold 2A , 3A, and then, the mesh wire 21D for polymerization connection is arranged on the upper part of the inner / outer molds 2A, 3A arranged on the left side, and then the integrated inner / outer molds 2B, 3B are formed. After the inner and outer molds 2A and 3A are continuously connected to each other, and further, the mesh connection 21S for polymerization connection is arranged on the upper and lower inner and outer molds 2A and 3A, and then the inner and outer molds Inner and outer molds 2B and 3B that are integrated on top of the molds 2A and 3A are installed in series, and finally,
A mesh line 21F for overlapping connection is arranged at the upper end of the upper left inner / outer molds 2B, 3B, and the upper right inner / outer molds 2B, 3B
After the superposition connecting mesh muscle 21G is arranged on the upper part of the above, the inner and outer molds 3K and 4K at the top are slid between them to assemble and connect them to form an annular body.

(Iii) Next, after jack reaction force is applied to the inner mold 2 of the annular body to propel the shield machine 1 for a certain distance, as shown in FIG. 6, the front side surface of the previously assembled annular body ( Assemble the second annular body by connecting it to the left side of the paper).

At that time, as shown in FIG. 4, a mesh line 22 for superposition connection is arranged between the inner mold form 2 and the outer mold form 3 on the side to be connected, and the inner structure is integrated by the erector 1a.・
Assemble the outer forms 2 and 3 while sliding them, and install them in series.
The overlapping connecting mesh muscles 22 used in this case are mainly for connecting the distribution muscles 20b, and as shown in FIG. 2 (b), the ring muscles 22a and the distribution muscles 22b are latticed. It is assembled into a shape. And this mesh wire for superposition connection
The notch 22s, 22s, ... Is formed in the part of the frame where the connecting members 7, 7 ,. Thereafter, in the same manner, the second annular body is assembled by repeating the step (ii) while arranging the superposition connecting mesh muscles 22.

(Iv) Further, by repeating the step (iii) in the same manner, as shown in FIG. 7, the third annular body is assembled on the front side surface of the second annular body. The end frame 4 is fixed to the front side surfaces of the inner mold form 2 and the outer mold form 3 that form the third annular body, whereby the inner mold form 2 and the outer mold form are formed. A cylindrical closed space S in which concrete C can be placed is formed between the frame 3 and the frame 3. In addition,
In this embodiment, the inner and outer molds 2 and 3 to which the end frame 4 is fixed are used as the third annular body, but the present invention is not limited to this, and any annular body may be used depending on the situation. The length of the closed space S can be freely adjusted.

The concrete pouring section is completed here. In this concrete placing section, the load from the outer formwork 3 to the spacers 7, 7, ...
It is transmitted to the inner formwork 2 via a, 2a, ...

(V) Then, as shown in FIG. 3, after the above step (iii) is repeated and one annular body is further installed in front of the concrete placing section (tuning direction),
Between the inner formwork 2 and the outer formwork 3 in the concrete placing section, concrete C is placed by a placing pipe 13 and concrete lining R is applied. It should be noted that the filling of the concrete into the formwork is performed from an injection hole (not shown) of the inner formwork 2.

Therefore, the outer frame 3 is permanently buried in the concrete as a lining material, and the gable frame 4 is also buried.

(Vi) Further, the excavated hole is lined by sequentially repeating the steps (ii) to (v). In this way, as the lining is carried out sequentially, the unconsolidated concrete section in the state where the concrete has not hardened further behind the concrete placing section (right side with respect to the paper surface),
After that, a solidified concrete section (not shown) in which the concrete is completely hardened is successively completed. Backfill grout is injected into the solidified concrete section between the outer form 3 and the wall of the excavated mine H.

In this solidified concrete section, due to the strength development of the concrete lining R, the concrete lining R bears long-term loads received from the ground E, and the friction force acting on the adhesion surface with the inner formwork 2 shields it. It will be responsible for the short-term jack thrust that acts when the aircraft 1 is propelled. In the present embodiment, the jack thrust can be received not only by the frictional force between the adhering surface of the concrete C and the skin plate 2S but also by the cone 2a fixed to the outer peripheral surface of the skin plate 2S. The length of the consolidated concrete section can be shortened.

In addition, after confirming that the solidified concrete section completed as described above has reached a predetermined length, the inner formwork 2 of the formwork dismantling section (not shown) behind the solidified concrete section is finally removed. It will be dismantled from the department.

Therefore, in the construction method of the present invention, in the primary lining, the concrete lining R in which the reinforcing bars are arranged is applied to complete the tunnel, and the concrete lining R completes the long-term load such as soil water pressure and the short-term load such as jack thrust. Since it bears the load, the outer formwork 3 embedded in the concrete becomes cheaper, eliminating the need for expensive segments as lining material and the need for concrete lining as secondary lining. To do. Since the concrete lining R is made of reinforced concrete, it can exhibit sufficiently large strength. Further, according to the construction method of the present invention, the mesh reinforcement 20 and the mesh reinforcements 21, 2 for superposition connection are provided between the inner mold 2 and the outer mold 3.
The formwork is assembled while arranging the two, and moreover, the mesh for superposition connection is simply overlapped with both the mesh rebars 20 and 20 adjacent to each other. Both mesh reinforcements 20 and 20 are naturally connected to each other via reinforcements 21 and 22, so that one rebar is placed between the inner formwork 2 and the outer formwork 3, Bundling work can be omitted, a lot of time and labor can be saved, and there is no need to form a reinforcing bar insertion port or a binding work window necessary for the inner formwork 2 therefor. The manufacturing cost of the inner formwork 2 can be reduced, and the construction period required for tunnel construction and the construction cost can be reduced.

In the above embodiment, the reinforcing bar is used as the mesh reinforcing bar 20, but the reinforcing bar is not limited to this and may be any mesh-shaped one having a predetermined strength, in particular, N.
By using FM (new fiber mesh), it is possible to obtain a mesh streak 20 that does not rust.

"Effects of the Invention" As described above, the present invention, when integrating the inner mold and the outer mold, arranges a mesh streak between the inner mold and the outer mold, and then, When the outer mold and the inner mold are continuously arranged in the circumferential direction and in the tunnel excavation direction and assembled in a cylindrical shape, the inner mold and the outer mold at the connecting portion are used for polymerization connection. Since the mesh muscles are arranged so as to overlap both of the adjacent mesh muscles, and the mesh muscles for mutual connection are connected to each other through the mesh muscles for overlapping connection, the inner formwork and Reinforcing bars can be easily and quickly arranged between the outer formwork and the inner formwork does not need to be provided with a rebar insertion port or a window necessary for binding the rebars. It is possible to reduce the cost, reduce the construction period, and reduce the construction cost.

[Brief description of drawings]

FIGS. 1 to 7 show an embodiment of the present invention, and FIG. 1 (a) shows an essential part of the present invention. A front view showing a state of being arranged between them, FIG. 1 (b) is a side view of FIG. 1 (a), and FIG.
Figure (a) is a plan view of mesh connecting mesh reinforcements used in the connecting portion in the circumferential direction of the form, and Figure 2 (b) is a connection connecting mesh used in the connecting portion in the tunneling direction of the form. Fig. 3 is a plan view of the streak, Fig. 3 is a side sectional view of the tunnel for explaining the outline of the construction method of the present invention, and Fig. 4 is a tunnel for explaining that the formwork is continuously connected in the tunnel excavation direction. FIG. 5 is a side sectional view for explaining the process of assembling the mold in a ring shape, and FIG.
A side sectional view of the tunnel in a state where the second annular body is assembled,
FIG. 7 is a side sectional view showing a state in which the third annular body is assembled, and FIGS. 8 to 14 show a conventional technique. FIG. 8 shows the arrangement in the form. Front view of four-divided ring reinforcement, Figures 9 and 10 are front views of the formwork for explaining the method of arranging the ring reinforcement in the formwork, and Fig. 11 is the reinforcement of reinforcement muscles. Fig. 12 is a side sectional view of a tunnel for explaining what to do, a side sectional view of a tunnel showing placing concrete in the assembled form of Fig. 12, and Fig. 13 is an annular form of a form with a gable frame. An annular front view showing the assembled state,
FIG. 14 is an enlarged sectional view of a connecting portion in the tunnel excavation direction. E ... Ground, C ... Concrete, R ... Concrete lining, H ... Pit, 1 ... Shielding machine, 2, (2A, 2B,
2K) …… Inner mold, 3, (3A, 3B, 3K) …… Outer mold, 7 …… Coupling member, 20 (20A, 20B, 20K) …… Mesh reinforcement, 21 (21A, 2)
1B, 21C, 21D, 21E, 21F, 21G) …… Overlap connection mesh reinforcement (circumferential direction), 22 …… Overlap connection mesh reinforcement (tunnel excavation direction)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Nishimura, Shinichi Nishimura, Chuo-ku, Tokyo, 2-161-1, Kyobashi, Ltd. (72) Inventor, Toyoji Tokyo, Chuo-ku, Tokyo, 2-16-1, Kyobashi, Shimizu Construction company (56) Reference JP-A-60-141997 (JP, A) JP-A-60-123700 (JP, A)

Claims (1)

[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, concrete is placed between the inner formwork and the outer formwork to provide concrete lining, and then, when the solidified portion of the concrete lining reaches a predetermined length, the inner formwork is removed. It is a cast-in-place lining method using mesh reinforcement in the non-segment shield construction method that constructs a tunnel in the ground while separating it from the formwork and dismantling it and reusing it as an inner formwork to be assembled on the newly excavated wall. Then, when integrating the inner mold and the outer mold, a mesh streak is arranged between the inner mold and the outer mold,
Next, when the outer formwork and the inner formwork are continuously assembled along the wall surface of the mine in the circumferential direction and in the tunnel excavation direction to assemble in a tubular shape, the inner formwork and the outer form of the connecting portion are formed. Between the formwork and the mesh bar adjacent to each other, the mesh bar for non-segment shield construction method characterized by arranging the mesh bar for overlapping connection for connecting the mesh bars Cast-in-place lining method used.