JP2691473B2 - Tunnel lining Concrete continuous pouring method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a continuous lining concrete pouring device capable of simultaneously excavating and lining concrete in a tunnel construction by mechanical excavation. .

[Conventional technology]

Conventionally, when placing lining concrete in tunnel construction, after completion of excavation with a tunnel excavator or at a position considerably behind the excavation face, non-telescopic type steel foam, kneaded beam type steel foam,
A method of placing concrete in blocks one by one using a movable or split form such as telescopic steel foam or Baracentre was adopted.

However, in these lining methods, one casting length is 6 to 12
It is about m, and due to reasons such as concrete curing and placing cycle, the placing is limited to once a day, it is not possible to speed up the construction at all, and due to the increase in vertical shafts, road obstacles etc. Since it causes a problem and is left unattended for a long time from excavation to concrete placement, it has problems such as ensuring the support of the tunnel and stabilizing the ground.

On the other hand, in recent years, the segment construction method has been widely used due to the demand for faster construction and labor saving, but this construction method makes it difficult to avoid subsidence and the segment itself is expensive. Including the cost, it may occupy half of the total construction cost, and the construction cost becomes expensive, which is not economical.

In recent years, the ELC method (Extru
ded Concrete Lining method) is attracting attention. The E
In Japan, the LC method is also called the "direct-casting concrete method". In this method, the inner formwork is assembled in parallel with this excavation behind the excavation by the shield machine, and it is applied while applying compressive force to the fresh concrete. It is intended to build lining concrete that is closely attached to the ground.

[Problems to be solved by the invention]

However, the ELC method can suppress the surface subsidence, improve the construction speed, and reduce the construction cost compared to the method of placing concrete one by one block after the completion of excavation as described above or the segment construction method. ,
After excavating one stroke, dismantle the inner formwork at the final row of concrete pouring completion point, move to the front row and assemble, and perform concrete pouring for one streak, so this sequence of dismantling, moving and assembling Must be performed for each stroke excavation, which requires time and effort,
There is a certain limit to the construction speed.

Therefore, the main object of the present invention is to be able to continuously pour lining concrete in close contact with the ground in parallel with tunnel excavation, simplify the time and effort required for the formwork at that time, and implement the construction. It is intended to provide a continuous pouring method for lining concrete which is speedy and labor-saving.

[Means for solving the problem]

The subject has a lining concrete pouring / pressurizing device, a slide form device, and a reaction force receiving grip device in this order on the pit side of a tunnel excavator. Is an outer peripheral surface frame for supporting the excavation surface, fixed support means for pressing a part or all of the outer peripheral surface frame against the excavation surface to fix itself to the excavation surface, and when placing lining concrete Functioning as a side formwork of the concrete, driven to move forward and backward in the tunnel direction in order to press the poured lining concrete from its connecting end face, and the outer diameter and casting cover that are substantially the same as the excavated cross-sectional shape. An annular frame member having a member width corresponding to the thickness of the worked concrete, and a concrete pouring port communicating with the tunnel pit side surface and the opposite side surface of the annular frame material, wherein the slide formwork device comprises the lining concrete pouring Installation An inner formwork that is entrained by a pressurizing device and has an outer diameter capable of being inscribed in the inner surface of the frame material of the annular frame material, and becomes the formwork for the lining concrete pouring together with the annular frame material when the lining concrete is placed And a fixing support means for fixing a part or all of the outer peripheral surface frame to the existing inner surface of the rolled concrete by fixing the inner peripheral surface of the outer peripheral frame to the existing inner surface of the rolled concrete. The grip device is connected to the slide form frame device by a sliding jack, has an outer peripheral face frame having substantially the same outer diameter as the outer peripheral face frame of the slide form frame device, and a part of the outer peripheral face frame. Or a fixed support means for pressing the whole to the existing inner surface of the rolled concrete to fix itself to the inner surface of the existing rolled concrete, the tunnel excavator and the lining concrete pouring / pressurizing device. Using a continuous tunnel lining concrete pouring device as a separate unit, following tunnel excavation by a shield machine, the lining concrete pouring / pressurizing device, slide formwork device, and reaction force receiving grip device are carried in this order. Then, the lining concrete placing / pressurizing device is fixedly supported on the excavation surface every one stroke excavation by the shield machine, and the annular frame material is moved in the tunnel face direction, and following this, The inner frame outer peripheral surface frame of the slide mold device is moved so as to be fitted into the annular frame member, thereby forming a space closed by the annular frame member and the inner mold outer peripheral surface frame. Forming and supplying the lining concrete from the casting opening of the annular frame material to this space, while maintaining it under pressure until hardening, to form the lining concrete continuously You can solve it by doing.

[Action]

In the present invention, all the devices constituting the lining concrete continuous casting device have an outer diameter shape that is inscribed in the tunnel excavation surface or the lining concrete inner wall. Therefore, each device contributes to stable ground and each device itself is also stabilized.

First, since the lining concrete pouring / pressurizing device is provided with a fixing support means for pressing a part or all of the outer peripheral surface frame against the excavation surface to fix itself to the excavation surface, It can be used as a stable point and a reaction point at the time of pressurization. Further, it is provided with an annular frame member that is configured to be movable back and forth toward the tunnel exit side, for example, by a jack, and has an outer diameter substantially the same as the excavation cross-sectional shape and a member width corresponding to the thickness of the concrete for the cast lining. . Therefore,
It functions as a side form at the time of placing the lining concrete, and pressure can be applied from the joining end surface of the lining concrete after the placing and until hardening. In addition, when the lining concrete pouring / pressurizing device moves forward, the annular frame material is pressed against the connecting end face of the lining concrete and an advancing operation is performed, so that the lining concrete can move forward in a reactive manner.

Then, by providing a concrete pouring port that communicates with the tunnel pit side surface of the annular frame material and the opposite side surface thereof, the annular frame material has an outer diameter that can be inscribed in the inner wall of the annular frame material, and will be described later. A lining is made from the concrete pouring port in the space that is sequentially formed by the outer peripheral frame for the inner formwork, which is movably driven in the tunnel direction by the moving operation, and the connecting end face of the lining concrete at the time of the last pouring. Can supply concrete. Therefore, the lining concrete can be continuously poured.

The slide form frame device and the reaction force receiving grip device both have a fixing support means for fixing a part or the whole of the outer peripheral surface frame to the existing inner surface of the rolled concrete by pressing it against the inner surface of the existing rolled concrete. In addition, since they are connected to each other by a sliding jack in the tunnel direction, when one moves forward, the other is fixed, and when the other moves forward, one is fixed, thereby fixing each other. The movement can be repeated to gradually move to the lining concrete pouring position. Therefore, it is possible to simplify the formwork work. Further, both of the above devices have an outer peripheral surface frame that is inscribed in the existing inner wall of the lining concrete, so that they are held until the concrete hardens so as not to collapse.

In addition, the slide formwork device has an inner formwork function and also has a fixing and holding function of itself, so that the slide formwork device has an outer peripheral surface frame part for the inner formwork and a grip part for fixing itself to the excavation surface. And may be connected to each other by a slide jack in the tunnel direction.

When constructing tunnel lining concrete, first
Following the excavation by the tunnel excavator, the lining concrete placing / pressurizing device, the slide formwork device and the reaction force receiving grip device are carried in this order.

Then, each time one-stroke excavation by the tunnel excavator is completed, the lining concrete pouring / pressurizing device is fixedly supported on the excavation surface so as to become a reaction force point when pressuring the pouring concrete. To do.

Next, the annular frame material of the lining concrete pouring / pressurizing device is moved in the tunnel face direction, and following this, the annular frame material is attached to the outer peripheral surface frame for the inner formwork of the slide formwork device. Move so as to be in the inserted state. Thereby, a space closed by the annular frame member and the outer peripheral frame for the inner mold can be formed. Then, the lining concrete is supplied to this space from the pouring opening of the annular frame material and is kept under pressure until it is hardened, thereby continuously forming the lining concrete in close contact with the natural ground. You can

In addition, division is performed by placing the lining concrete for each stroke excavation by the tunnel excavator by repeatedly forming the closed space by moving the annular frame material and the outer peripheral frame for the inner formwork and supplying the lining concrete. Placing is preferable for preventing loosening of the ground.

In the present invention, as described above, the lining concrete can be continuously placed in parallel with the tunnel excavation, and
Since the work of disassembling and installing the formwork is substantially omitted, the processing speed is fast and the work efficiency and labor can be reduced.

[Specific configuration of the invention]

 Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings.

The lining concrete continuous pouring device according to the present invention method,
As shown in FIG. 1, it comprises a lining concrete pouring / pressurizing device 1 (hereinafter, simply referred to as a pouring device), a front slide mold 2, a rear slide mold 3 and a reaction force receiving grip device 4. The driving device 1 is separated from other devices, and the front slide form frame 2 and the rear slide form frame 3 are connected by a first slide jack group 5, 5, ... The receiving grip device 4 is the second slide jack group 6,
6 ... are connected.

As shown in the transverse cross-sectional view of FIG. 2, the casting device 1 has a circular ring frame 10 made of steel plate, square steel, grooved steel, etc., and a circular surface frame 11 provided around the circular ring 10. A grip support base 16 fixed to the circular ring 10 is provided on one side, and a grip device 13 as a fixed support means of the driving device 1 is fixedly mounted on the grip support base 16. The grip device 13 includes a cylinder shaft 13 that expands and contracts in both directions.
A gripper 1 that has a and 13a and presses the excavation surface at its tip.
It has 4 and 14.

Further, the circular ring 10 is provided with press jacks 12, 12 ... Which are moved forward and backward toward the rear side of the tunnel at appropriate intervals in the circumferential direction, and the tip of the jack is used for concrete pouring. A press ring 17, which is an annular frame material, is provided for constituting the form frame side plate and for pressing the poured concrete in the tunnel direction.

A pouring port 18 for pouring concrete is provided at the top end of the pouring device 1, and concrete fed by a concrete pump (not shown) has an appropriate pressure through a concrete distributor such as a rotary valve. , Concrete can be placed. The jacks 15, 15, ... Provided around the grip device 13 are connected to the excavation 7 and are for pulling the placing device 1.

The front slide form frame 2 is, as shown in detail in the transverse sectional view of FIG. 3, a circular face frame on the outer circumference of the circular rings 20, 20.
21 is provided around and has a rectangular frame 22 inside thereof. The circular rings 21, 21 ... Are pin-coupled at appropriate places in the circumferential direction, the upper portion is separated, the lower end of the rectangular frame 22 is fixed to the circular ring 20, and the turn buckle 24 is provided on the side thereof. , 24 and is connected to the circular ring 20 via a ring 24, and is expandable and contractable in the circumferential direction within a certain range. The upper portion of the circular ring 20 is connected via journal jacks 23, 23, and the structure can be adjusted in the height direction and can be folded.
The front slide form 2 is inserted into the press ring 17 in an inscribed state as shown by the chain line in FIG. 1 and serves as an inner form at the time of placing concrete. Once adjusted to an outer diameter shape that can be fitted into the press ring 17, it is basically fixed during construction.

In addition, the front slide formwork 2 is divided into a front part and a rear part thereof, and these two bodies are connected by a connection adjusting bolt or the like,
When constructing a curved part, adjust the separation with the connection adjustment bolt to have a curvature, and seal the gap with packing etc. to prevent leakage of concrete and water stop function By doing so, it is possible to easily handle curved construction.

The front slide mold 2 and the first slide jack group 5,
As shown in the transverse sectional view of FIG. 4, the rear slide formwork 3 connected by 5 has circular surface frames 31 around the outer circumferences of the circular rings 30, 30, ... Pin connection at each end of the circular ring with a grip jack 32
By connecting via the grip jack 32
Is configured to be expandable and contractible in the circumferential direction by the expansion and contraction operation of the rear slide form 3, so that the rear slide formwork 3 can be fixed to the existing tunnel winding concrete surface. The reaction force point is set when the grip device 4 is pulled forward.

In this specific example, the front slide form frame 2 and the rear slide form frame 3 are connected by the first slide jacks 5, 5, ... However, it is possible to omit them and configure them integrally. In this case, when the integrated slide frame is moved forward, the reaction force receiving grip device 4 is used as a reaction force point to move forward by the second slide jacks 6, 6 ,. The body slide form may be used as the reaction force point.

As shown in FIG. 5, the reaction force receiving grip device 4 in the last row has substantially the same structure as the rear slide form frame 3,
A circular surface frame 41 is provided around the outer circumferences of the circular rings 40, 40 ..., and pin connection is made at appropriate positions in the circumferential direction, and the ends of the circular rings are connected via a grip jack 42, whereby the grip jack 42 is formed. The reaction force receiving grip device 4 can be fixed to the existing tunnel winding concrete surface by expanding and contracting in the circumferential direction by the expansion and contraction operation of. It becomes the reaction point of the occasion.

In order to place concrete in a tunnel lining using such a continuous placing device, first, as shown in FIG. 6, the tunnel excavator 7 at the tunnel face position rotates the cutter head and thrusts the thrust jack. The ground is excavated by extrusion. Hereinafter, description will be given with reference to FIGS. 7 and 8.

7 (1) When the excavation (about 1.5 m) corresponding to one stroke of the thrust jack by the tunnel excavator 7 is completed, the gripper 13 of the placing device 1 extends the gripper 14 to remove the placing device 1 itself. Fix on the excavation surface.

FIG. 7 (2) Then, the press ring 12 of the pouring device 1 separates the press ring 17 from the pouring joint of the pouring concrete by about 30 cm. As a result, a space S surrounded by the outer surface of the circular surface frame 21 of the front slide form 2, the tunnel pit side surface of the press ring 17, and the existing joints of rolled concrete is formed.

Fig. 7 (3) Concrete N is poured into the space S through the pouring port 18. If the space S is filled with concrete N and the feed pressure of the concrete pump exceeds a certain value,
Stop feeding concrete once.

The poured concrete N is constantly kept under pressure by the press ring 17.

FIG. 7 (4) Next, the grip jack 32 of the rear slide form frame 3 is extended to fix the rear slide form frame 3 to the rolled concrete R surface, and the first slide jack 5 is used for the front slide form frame 2. Advance about 30 cm.

7 (5) After that, while fixing the grip jack 42 of the reaction force receiving grip 4 to the overhanging concrete R surface, the rear slide formwork 3 is unfixed, and the rear slide formwork 3 is also about 30 cm. To move forward.

The steps up to this point are set as one cycle, and the step of placing the concrete N again by separating the press ring 17 by about 30 cm from the joint of the cast concrete N (see FIG. 7 (6)) is repeated. Repeat the above cycle until the length of the poured concrete N, N ... becomes 1.5 m, which is equivalent to one stroke excavation of the tunnel excavator as shown in Fig. 8 (6) and (7). , Complete the concrete pouring.

FIG. 8 (8) Next, the grip device 13 of the placing device 1 is loosened, and the concrete jacking end face is pushed by the press ring 17 by the extension of the press jacks 12, 12, ... Is moved forward by about 1.5 m, the projecting device 1 is again fixed to the excavation surface by overhanging the grip device 13, and concrete N, N ... Is predetermined through the press ring 17 by operating the press jacks 12, 12. Pressurize with pressure and hold for 20 to 30 minutes. The above-mentioned pressurization value is appropriately determined from the viewpoint of having a sufficient waterproofness against water pressure and minimizing ground subsidence within a range that does not destroy the ground.

8 (9) In the meantime, the rear slide formwork 3 is fixed to the rolled concrete R surface, and the reaction force receiving grip 4 is moved forward by 1.5 m by the second slide jack 6 to be fixed and held, and the shield. The excavation is started again by the machine 7.

In addition, in the above-mentioned concrete example, in order to prevent loosening of the ground as much as possible, the section equivalent to 1-stroke excavation (1.5 m) by the tunnel excavator was divided into 30 cm × 5 times and concrete was placed, If the speed is prioritized, the section corresponding to the one-stroke excavation may be performed by placing the concrete once.

As described above, according to the detailed construction method of the present invention, the lining concrete to be placed is placed while continuously applying a pressure,
After that, since it is kept in a pressure state until it is cured, it adheres to the natural ground. Therefore, the ground is stable without loosening, there is almost no subsidence, and there is no effect on the surrounding structures. In addition, the lining concrete can be placed concurrently with excavation, and the construction can be speeded up. In particular, compared to conventional methods such as the ELC method, the time and labor required for formwork can be greatly reduced.

Incidentally, as the cast concrete according to the method of the present invention,
It is possible to use fly ash, and special concrete in which steel fibers and admixtures such as fluidizers and retarders are mixed therein.

〔The invention's effect〕

As described above in detail, according to the present invention, it is possible to place lining concrete in close contact with the ground simultaneously with tunnel excavation, while simplifying the time and labor required for the formwork at that time. Speeding up and labor saving can be achieved.

[Brief description of the drawings]

1 is a view showing a continuous lining concrete pouring device according to the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 4 is a transverse sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is a transverse sectional view taken along the line VV of FIG. 1, and FIG. 6 is a view for explaining the procedure for placing lining concrete. FIG. 7 is a diagram for explaining the procedure for placing lining concrete, and FIG. 8 is a diagram for explaining the procedure for placing lining concrete. 1 ... Lining concrete pouring / pressurizing device, 2 ... Front slide formwork, 3 ... Rear slide formwork, 4 ... Reaction force receiving grip device, 5 ... First slide jack, 6 ... 2 slide jacks, 7 ... Tunnel excavator

Claims (3)

(57) [Claims] 1. A lining concrete pouring / pressurizing device, a slide formwork device, and a reaction force receiving grip device are provided in this order on the pit side of a tunnel excavator. The equipment consists of an outer peripheral frame for supporting the excavation surface, fixed support means for pressing part or all of the outer peripheral surface frame against the excavation surface to fix itself to the excavation surface, and lining concrete pouring. It functions as a side form at the time, is driven to move forward and backward in the tunnel direction to press the placed lining concrete from its connecting end face, and has an outer diameter and placement substantially the same as the excavated cross-sectional shape. An annular frame member having a member width corresponding to the thickness of the lining concrete, and a concrete pouring port communicating with the tunnel pit side surface of the annular frame material and the opposite side surface thereof, wherein the slide formwork device is the lining concrete Casting An inner formwork that is entrained by a pressurizing device and has an outer diameter capable of being inscribed in the inner surface of the frame material of the annular frame material, and that serves as a formwork for lining concrete pouring together with the annular frame material when placing the lining concrete material. And a fixing support means for fixing a part or all of the outer peripheral surface frame to the existing inner surface of the rolled concrete by fixing the inner peripheral surface of the outer peripheral frame to the existing inner surface of the rolled concrete. The grip device is connected to the slide form frame device by a sliding jack, has an outer peripheral face frame having substantially the same outer diameter as the outer peripheral face frame of the slide form frame device, and a part of the outer peripheral face frame. Or a fixed supporting means for pressing the whole to the existing inner surface of the rolled concrete to fix itself to the inner surface of the existing rolled concrete, the tunnel excavator and the lining concrete pouring / pressurizing device. Using a continuous lining concrete pouring device as a separate unit, following the tunnel excavation by the shield machine, the lining concrete pouring / pressurizing device, slide formwork device and reaction force receiving grip device are carried in this order. Let's use the shield machine 1
For each stroke excavation, the lining concrete pouring / pressurizing device is fixedly supported on the excavation surface, the annular frame member is moved in the tunnel face direction, and following this, the annular frame member slides on the annular frame member. The outer peripheral frame for the inner mold of the mold frame device is moved so as to be in a fitted state, thereby forming a space closed by the annular frame member and the outer peripheral frame for the inner mold, and in the space, Tunnel lining characterized by supplying lining concrete from the casting opening of the annular frame material and maintaining it under pressure until hardening, while continuously forming lining concrete Continuous pouring method for concrete. 2. Forming a closed space by moving an annular frame material and an outer peripheral frame for an inner frame by dividing the placing of the lining concrete for each stroke excavation by a shield machine, and supplying the lining concrete. The method for continuously placing concrete for tunnel lining according to claim 1, wherein the method is repeated. 3. A slide form device is performed by a device in which an outer form frame part for an inner form part and a grip part for fixing itself to an excavation surface are separated and connected to each other by a sliding jack in a tunnel direction. A method for continuously placing concrete for tunnel lining according to claim 1 or 2.