JPH0637835B2 - Equipment for shield tunnel lining with cast-in-place concrete - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lining apparatus for forming a lining of a tunnel with cast-in-place concrete in a tunnel excavated by a shield machine.

2. Description of the Related Art Conventionally, a method of lining a tunnel with cast-in-place concrete is, as shown generally in FIG. 10, at an appropriate distance between the outer plate 41 and the outer plate 41 at the rear of the shield machine 40. In order to form a space 42 that communicates in the circumferential direction, a cylindrical circular frame 43 that is continuously divided into segments from the rear is assembled, and the wife frame 4 is formed on the entire surface of the space 42.
4 is slidably mounted, and the space 42 is filled with concrete from a pouring pipe 45 mounted on the inner mold 43, and is connected to a pressing jack 46 and is formed by a pressing ring 47 integrally formed in an annular shape. Filled concrete,
Presses together with the wife formwork 44, and at the same time jacks 48 for propulsion
Is operated to push the inner formwork 43 by the push plate 49 connected to the propulsion jack 48 to propel the shield machine 40, and the inner formwork 43 after the shield machine 40 has propelled it. A lining of cast-in-place concrete was continuously formed between the ground 50 and the previously cast concrete.

The lining method according to Japanese Patent Application No. 63-281377 (Japanese Patent Laid-Open No. 2-128093) previously developed by the inventor of the present invention, as shown in FIG. In the rear part of the
The inner cylinder 63 is connected to the shield machine 60 in a fixed state in a substantially concentric and concentric manner with the outer cylinder 61 so that a gap 62 communicating with the outer circumference 61 is formed with an appropriate space between the inner cylinder 63 and the outer cylinder 61. ,
An inner mold frame 65 constituted by segments is continuously assembled from the rear so that an appropriate space 64 is formed between the inner cylinder 63 and the inner cylinder 63, and the inner cylinder 63 is placed in the gap 62.
Concrete is filled from the injection pipe 66 attached to, and the filled concrete is extruded rearward by the compression ring 68 formed integrally with the lining jack 67 and formed in an annular shape. Therefore, the inner form 65 is pressed to propel the shield machine 60, and the ground 70 behind the shield machine 60 and the inner form 65 are pushed.
I am trying to form a lining between and.

Problems to be Solved by the Invention In the shield machine used in the conventional lining method, as will be described with reference to FIG. 10, the cross section of the space 42 filled with concrete in advance has an outer plate 41 and an inner mold. Along the frame 43, the pressure ring 47 is communicated over the entire circumference, and the pressing ring 47 is also integrally formed in an annular shape so as to close the cross section of the space 42. In synchronization with the shield machine 40, the transverse vertical plane is held and the space is moved back and forth in the space 42.

When the pressing ring 47 is pulled back immediately after the pressing of the concrete by the pressing ring 47 is completed and the propulsion of the shield machine 40 is completed, the entire end surface of the pressed concrete loses its support at one time and is not consolidated. The concrete was in danger of collapsing. Therefore, after the pressing of the concrete is completed, the gable form 4 inserted between the pressing ring 47 and the concrete by the bolts 51 and the like which are continuously embedded in the concrete from the rear side in advance.
After fixing No. 4 and supporting the end face of the pressed concrete, the pressing ring 47 was pulled back to fill the concrete in the next step.

Therefore, the gable formwork 44 has a lining joint for each process,
It was buried. Further, when the concrete is pressed directly by the pressing ring 47 without providing the gable form 44, or when the gable form 44 is provided and removed and transferred, until the end face of the pressed concrete becomes self-supporting. ,
After waiting for the concrete to harden, the pressing ring 47 was pulled back to fill the concrete in the next step.

As a result, the seams of the lining that the wife formwork 44 has buried, and the seams that have been struck by waiting for its hardening until the gable surface becomes independent, are weak points in the lining strength, When water leaks due to groundwater or when the gable form 44 is removed, it takes time for the pressed gable surface of the concrete to become self-supporting, impairing the efficiency of the tunnel lining work using cast-in-place concrete.

Generally, the ground excavated by the shield machine is not necessarily excavated uniformly along the outer periphery of the outer wall of the shield machine, and the ground wall may partially collapse. ,
Also, during curved construction, overcutting is performed larger than the outer circumference of the shield machine to make it easier for the shield machine to bend, and the excavated cross section of the ground is planned. Larger things often happen.

In the conventional lining method using cast-in-place concrete,
To explain with reference to FIG. 0, a space 42 whose cross-sections communicate with each other is filled with a predetermined amount of concrete,
After that, the concrete was pressed backward by the pressing ring 47 that was annularly integrated.

Therefore, the pressed concrete is extruded backwards in an equal amount over the entire circumference, but if the excavated ground wall is collapsed or overexcavated, the extruded concrete is
It flows downwards due to the weight and is applied to the collapsed and overexposed parts, and the lower part of the lining is filled with concrete, but the upper part lacks concrete, and the lining thickness becomes thin, There were problems such as the formation of voids between the ground and the lining concrete, and the lower part of the lining concrete was consolidated, but from the side part to the upper part there was insufficient consolidation, resulting in weak concrete. .

For such a problem, in the conventional lining method,
After the completion of the pushing of the shield machine 40 and the pressing of the concrete, before the hardening of the concrete begins, the inner formwork 4
The lining portion was replenished with concrete from the injection pipe 45 provided in No. 3.

However, if you just add concrete,
It is unclear whether a lining made of concrete that has been uniformly consolidated on both sides was formed.

Therefore, even if the pressing ring 47 is pulled back to replenish the space with concrete, and the pressure is re-pressed to consolidate, when the pressing ring 47 is pulled back forward, the space is in communication over the entire circumference. The end face of the hardened concrete collapses and flows into the space 42 below.

Even if the concrete in such a state is re-pressed synchronously rearward by the pressing ring 47 formed integrally with the annular shape, the concrete is pushed upward again and is uniformly consolidated over the entire circumference. It was difficult to form a concrete lining.

Further, in the lining method according to Japanese Patent Application No. 63-281377, as shown in FIG. 11, an inner cylinder 63 is provided separately from the inner mold 65, and a space between the outer cylinder 61 and the inner cylinder 63 is provided. The gap 62 should be filled with concrete, and the inner cylinder 6
Since the space 64 is formed between the inner mold 3 and the inner mold 65, the
The purpose is to make it easy to turn,
The gap 62 formed between the outer cylinder 61 and the inner cylinder 63 and the structure of the compression ring 68 follow the conventional method. That is, the gap 62 communicates with the outer cylinder 61 and the inner cylinder 63 over the entire circumference, and the compression ring 68 is integrally formed in an annular shape so as to close the cross section of the gap 62, and synchronously. It is designed to slide back and forth.

In this lining method, it is structurally difficult to insert and fix the gable formwork between the concrete to be pressed and the compression ring 68, and the concrete pressing and the shield machine 6
If the compression ring 68 is pulled back immediately after the zero thrust is completed, the pressed concrete may collapse. Therefore, until the end face of the pressed concrete becomes self-supporting, the compression ring 6
8 is pulled back to fill the gap 62 with concrete in the next step.

Therefore, similarly to the conventional lining method, there is a problem that it takes time until the pressed concrete becomes self-supporting.

Further, in this lining method, when the ground wall excavated by the shield machine 60 is collapsed or over-excavated and the concrete amount is insufficient, the inner formwork is performed as in the conventional case. Although it is possible to add a new injection pipe to 65 to replenish the lining concrete, the compression ring 68 is pulled back, the concrete is replenished, and the concrete is re-pressed to uniformly and vertically consolidate the concrete. Forming a lining has been as difficult as in the past.

The present invention solves the above problems in the prior art and improves the shield machine used in the lining method according to Japanese Patent Application No. 63-281377 to provide a tunnel made of cast-in-place concrete. It is intended to make the lining method of (2) safer and more reliable.

Means for Solving the Problems A lining apparatus of the present invention intended to improve the lining apparatus used in the lining method according to Japanese Patent Application No. 63-281377 is shown in FIG. As shown in FIG. 5, (a) a cylindrical outer casing 2 of the shield machine 1, and (b) an appropriate space between the outer casing 2 and the outer casing 2. An inner cylinder 12 having a front end connected by a connecting device 17 to a frame 16 fixed to the outer cylinder 2 and provided so as to form a gap 11 with the inner cylinder 12 having a packing 14 attached at the rear end.
(C) By the partition plate 15 which is vertically provided in the gap 11 so as to extend longitudinally in the front-rear direction and which is fixed to either the inner cylinder 12 or the outer cylinder 2, the gap 11 is formed. Each part gap 11n formed by dividing into a plurality of parts, and (d) each part gap 11n.
The cross section of n is closed, and the compression heads 22n are formed so as to be slidable forward and backward, and (e) the rear end is opened and attached to the rear surface of the compression head 22n, and the front end is connected to the concrete pump, An injection pipe 24 adapted to be filled with concrete is provided at the rear part of each part compression head 22n in each part gap 11n, and (f) each part compression head 22n is connected to each part compression head 22n rearward. A lining jack 10 that is provided so as to be pressed or pulled back forward, and (g) is continuously assembled from the rear in the inner cylinder 12, and an appropriate gap 31 is provided between the inner cylinder 12 and the lining. The inner formwork 30 formed so as to have, and (h) the propulsion jack 9 that presses the inner formwork 30 so as to propel the shield machine 1, and (i) the compression heads described above. Is it a gap between each part? Between the extruded concrete and the compression head of each part, in the void formed by pulling back the compression head of each part forward, new concrete injected from the injection pipe is added to the compression head of each part. It is characterized by comprising a sensing means for sensing the pressing force.

Action The action of the lining device of the present invention configured as described above,
This will be described with reference to FIGS. 6 to 9 of the accompanying drawings.

In the previous step, the propulsion of the shield machine 1 was completed, and the concrete filled in the gaps 11n of the parts was pressed by the compression heads 22n of the parts, and the ground 34 and the inner formwork behind the shield machine 1 were pressed. After being extruded between 30 and 30, each part compression head 22n is stopped at the rear end part of the inner cylinder 12, and the extruded concrete is kept in a pressed state, in the bottom gap 11d at the bottom of each part gap 11n, Actuating the lining jack 10 to move the bottom compression head 2
While pulling back 2d forward, new concrete is filled into the space formed between the previously extruded concrete and the bottom compression head 22d through the injection pipe 24 so that the bottom compression head 22d is not filled. Stop at the front end of the tube 12.

Similarly, successively, in each upper part gap 11n, each part compression head 22n is pulled back, new concrete is filled, and each part compression head 22n is stopped at the front end part of the inner cylinder 12 to be extruded last time, It is possible to prevent the uncured concrete from collapsing or flowing, and to fill the gap 11n with new concrete while maintaining the close-packed state.

Next, the jack 9 for propulsion is shortened, and a new inner mold 30b is connected to the previously assembled inner mold 30a in the inner cylinder 12 to be assembled, and the jack 9 for propulsion is operated to create a new inner mold. The frame 30b is pressed to propel the shield machine 1 and the lining jack 10 is operated to move the gaps 11 between the parts.
The new concrete filled in n is simultaneously pressed by the compression heads 22n of the respective parts, and is pushed out between the natural ground 34 and the inner formwork 30 after being propelled by the shield machine 1.

When the propulsion of the shield machine 1 is completed, the compression heads 22n of the respective parts are stopped at the rear end of the inner cylinder 12 so as to maintain the densely packed state of the extruded concrete, but the concrete extruded rearward lacks concrete, or If there is a portion where the compaction is insufficient, the specific gap 11x is filled with an appropriate amount of concrete while pulling back the specific compression head 22x corresponding to that portion, and the specific compression head 22x is again drawn.
Press x backwards to replenish and reconsolidate the concrete shortage. As a result, the concrete extruded rearward is uniformly consolidated over the entire circumference, and a continuous lining is formed behind the shield machine 1.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a shield machine 1 to which a tunnel lining device made of cast-in-place concrete of the present invention is attached has an outer cylinder 2 formed in a cylindrical shape, and an excavator is provided in the front part thereof. To be

As in the conventional excavator, a partition wall 3 provided across the inside of the outer cylinder 2 and a shaft 5 arranged at the front end of the outer cylinder 2 and penetrating a bearing 4 provided in the partition wall 3 are used. , A rotatably supported cutter head 6 and a drive device 7 for rotating the cutter 6 excavate the natural ground, penetrate the excavated earth and sand through the partition wall 3, and from the front portion of the partition wall 3 a shield machine 1, a screw conveyor 8 and the like.

A plurality of jacks 9 for propulsion are arranged as a propulsion device of the shield machine 1 inside the outer cylinder 2 of the shield machine 1 and as a propulsion device for the shield machine 1, and a jack for lining for pressing the lining concrete. A plurality of 10 are arranged.

In the rear portion of the outer cylinder 2 of the shield machine 1, the tunnel lining device made of cast-in-place concrete of the present invention is mounted.

As a lining device, as shown in FIG. 2, in the outer cylinder 2 at the rear part of the shield machine 1, an appropriate space is provided between the outer casing 2 and the outer cylinder 2 in accordance with the lining thickness to be covered. With a gap 1
1 is formed, the inner cylinder 12 having an outer diameter smaller than the inner diameter of the outer cylinder 2 is provided.

The inner cylinder 12 has an inward flange 13 at the front end,
An L-shaped packing 14 is attached to the inside of the rear end over the entire circumference of the cylindrical body having an appropriate length, and the flange 13 is arranged in front and substantially parallel to and concentric with the outer cylinder 2.

In the gap 11 formed as described above, a plate-like partition plate 15 is vertically passed over substantially the entire length of the inner cylinder 12 so as to close the communication in the circumferential direction of the gap 11, and is erected radially. ,
The inner cylinder 12 or the outer cylinder 2 is fixedly provided.

The partition plates 15 are arranged at appropriate intervals in the cross section of the gap 11, and in the present embodiment, the gap is divided as follows as shown in FIG. The top of the gap 11 is called a top gap 11a, both sides thereof are called upper side gaps 11b, or its lower part is called a lower side gap 11c, and its bottom is called a bottom gap 11d. When these gaps are collectively referred to below, the gaps between the parts 11
n, and when specifying either of them, the specific gap 11
Let x.

The partition plate 15 is fixed to either the inner cylinder 12 or the outer cylinder 2 so that the inner cylinder 12 can be moved back and forth with respect to the outer cylinder 2 to assemble the shield machine 1 or Make it convenient for maintenance while working.

In front of the inner cylinder 12, a plate-like frame 16 fixed to the outer cylinder 2 is provided so as to stand substantially vertically with respect to the inner circumferential direction of the outer cylinder 2 with a proper space between the inner cylinder 12 and the flange 13. .

A connecting device 17 is provided between the frame 16 and the flange 13 of the inner cylinder 121 to connect the frame 16 and the inner cylinder 12. In the frame 16, the front end of each cylinder of the propulsion jack 9 and the lining jack 10 arranged on the inner periphery of the central portion of the outer cylinder 2 is penetrated with a part of the frame 16 opened or cut out. And may be supported.

The connecting device 17 for connecting the frame 16 and the inner cylinder 12
Are arranged between the frame 16 and the flange of the inner cylinder 12, and the structure is such that the flange 13 and the frame 1 are
6 and the pipe 18 is installed vertically, and the connecting bolt 1
The nut 20 is fastened by penetrating the nut 9.

By the connecting device 17 and the partition plate 15, the inner cylinder 12 is restrained from moving in the front-rear direction with respect to the outer cylinder 2, and is supported in a fixed state in parallel and concentrically. Further, by removing the connecting device 17, the inner cylinder 12 can be moved back and forth.

A compression head 22 that is formed so as to close each cross section and is slidable back and forth is formed in each of the gaps 11n defined between the inner cylinder 12 and the outer cylinder 2 configured as described above. Are fitted into the respective gaps 11n.

The compression head 22 has a structure in which a ring is divided, and the outer circumference thereof is in contact with the inner cylinder 12, the outer cylinder 2 and the partition plate 15,
Attach the packing 21. The compression heads 22 provided in the gaps 11n also have a top compression head 22a at the top, side upper compression heads 22b at both sides, a lower side compression head 22c at the bottom, and a bottom compression head at the bottom, corresponding to the gaps 11n. 22d. Hereinafter, these compression heads are collectively referred to as the compression heads 22n for each part, and when any one of them is specified, it is referred to as a specific compression head 22x.

Each of the compression heads 22n includes a lining jack 10 arranged around the inside of the outer cylinder 2 at the center of the shield machine 1,
The rod 23 is connected at the tip thereof.

In this embodiment, there are three bottom compression heads 22d,
Two other lining jacks 10 are arranged on the other compression heads 22a, 22b, and 22c, respectively, according to the assumed load. Further, the lining jack 10 is operated so that the compression head 22n of each portion arbitrarily shortens the rod 23 thereof and stops at the position of the front end portion of the inner cylinder 12 shown by the two-dot chain line in FIG. , The rod 23 is extended to form a gap 11n between each part.
The inside is slid, and in the final step, adjustment is made so as to stop at the position of the rear end portion of the inner cylinder 12 shown by the chain double-dashed line in FIG.

The rear end surface of the partition plate 15 has a compression head 22n for each part.
It is better to be on the same plane as the rear end face in the final step of.

Further, as shown in FIG. 3, a pouring pipe 24 for pumping concrete is attached to each of the compression heads 22n by penetrating from the front and opening on the rear surface. This injection pipe 24 is provided with a gap 11 for each part of the compression head 22n.
One or a plurality may be provided depending on the volume of n. Further, the injection pipe 24 is opened through the frame 16 and extends forward, so that the pipe end can be connected to the hose 25, a supply port 27 having a valve 26, and a stopper 28 at all times. A cleaning port 29 is provided so as to be able to clean the inside of the injection pipe 24 although it is closed by the above.

This injection pipe 24 is provided with a gap 1 between the compression heads 22n.
Although it moves back and forth as it slides within 1n, the injection pipe 24
It is also possible to expand and contract to form a double tube and fix the supply port side.

Further, a pressure gauge 37 is attached to the hydraulic circuit on the pressing side of the lining jack 10 described above so that the hydraulic pressure can be sensed by the positive scale, and the secondary scale is attached to convert the hydraulic pressure. The pressing force of the compression head 22n
Alternatively, the pressing force per unit area of the compression head 22n of each part can be detected.

The pressing force of the compression head 22n of each part is mechanically or electrically connected to the hydraulic circuit and is electrically configured by, for example, a pressure signal transmitter, an amplifier, an output setting device, and an indicator. This may be detected by using a pressure gauge having an output adjusting device, or the pressing force may be detected by attaching a pressing force detecting device having the same structure as the conventional one to the rear end surface of each compression head 22n. .

The lining apparatus of the present invention is configured by the portion mounted on the shield machine 1 side described so far and the portion of the inner formwork 30 described next. The inner formwork 30 forms the inner surface of the lining to protect the uncured concrete, and is pressed by the propulsion jack 9 when the shield machine 1 is propelled so that the reaction force thereof can be controlled. is there.

As in the conventional structure, the structure is a tubular body of a fixed length divided into segments, and flanges are attached to both ends of the tubular body so that the tubular bodies can be connected to each other.

Also in the present invention, using an inner formwork having the same structure as above,
The outer diameter of the inner formwork 30 is set to be smaller than the inner diameter of the inner cylinder 12 in the same manner as used in the lining method according to the above-mentioned Japanese Patent Application No. 63-281377. The inner formwork 30 is assembled in the inner cylinder 12 continuously from the rear part where the lining has been completed, so that a space 31 with an appropriate interval is formed between the inner formwork 30 and the inner cylinder 12. To do.

The void 31 is closed by the L-shaped packing 14 attached to the rear end of the inner cylinder 12 so that the concrete pushed out to the rear of the shield machine 1 does not flow back into the void 31. To do.

Further, the inner cylinder 12 is provided at the tip of the rod 32 of the plurality of propulsion jacks 9 arranged in the central portion of the shield machine 1.
A pressing plate 33 is attached so that the front end of the inner mold 30 assembled inside can be pressed.

A method of lining a shield tunnel with cast-in-place concrete using the lining apparatus of the present invention configured as described above and the operation of the lining apparatus will be described.

FIG. 6 shows that in the previous step, the concrete filled in the gaps 11n in each part actuated the jacket 10 for lining,
It is pressed by the compression heads 22n of the respective parts connected to the lining jack 10 and pushed out backward, and the compression heads 22n of the respective parts reach the final end of the pressing stroke to complete the pressing of the concrete, and the jacks for propelling the parts. 9 is operated, and the inner cylinder 12 is moved by the push plate 33 connected to the propulsion jack 9.
By pressing the inner formwork 30 continuously incorporated from the rear inside, the shield machine 1 is propelled together with the excavation of natural ground,
The entire process of pressing the propulsion jack 9 is completed, the propulsion of the shield machine 1 is completed, and the operations of the propulsion jack 9 and the lining jack 10 are stopped.

Next, as shown in FIG. 7, a hose 25 communicating with a concrete pump (not shown) is connected to the supply port 27 of the injection pipe 24 attached to the bottom compression head 22d.

Next, the top compression head 22a, the upper side heads, and the lower side compression heads 22b, 22c are lined up while the pressing of the concrete 35 in the previous step is completed, that is, the rod 23 of the liner jack 10 is extended. For jack 10
And pulling back the bottom compression head 22d forward, new concrete 36 is pressure-fed by a concrete pump, and the hose 25 connected to the supply port 27 passes the injection pipe 24 to the inside of the bottom gap 11d. By discharging the bottom compression head 22d to the rear part and pulling back the bottom compression head 22d, the concrete 35 extruded last time is discharged.
And the bottom compression head 22d is filled with new concrete 36.

In this way, with pulling back the bottom compression head 22d,
Immediately after that, the bottom gap 11 of the concrete 35 extruded last time is filled with the concrete.
Although it suppresses the inflow into the bottom d, the bottom compression head 22d is pulled back in the middle of filling the new concrete 36 while pulling back the bottom compression head 22d. While the concrete is being filled, the concrete 35 extruded last time is pushed back to flow into the bottom gap 11d, and the concrete 35 extruded last time is extruded.
It is possible to suppress loosening and flow of the resin and maintain a close packed state.

In this way, when a predetermined amount of new concrete 36 is filled in the bottom gap 11d and the bottom compression head 22d reaches the front end of the inner cylinder 12, the pulling back of the bottom compression head 22d is stopped and the supply to the supply port 27 is performed. The valve 26 thus closed is closed and the supply of new concrete 36 is stopped.

Next, it is confirmed whether or not the pressing of the bottom compression head 22d against the new filled concrete 36 obtains a certain pressing force by slightly pushing the bottom compression head 22d backward. If a constant pressing force is not obtained, the bottom compression head 22d is pulled back and the bottom gap 11
The bottom compression head 22d is stopped at the front end of the inner cylinder 12, at the position shown in FIG. 7, by replenishing the concrete in d and pushing it back again to obtain a constant pressing force.

As described above, in the previous process, the shield machine 1
Concrete 35 extruded rearward is loosened by pulling back the bottom compression head 22d,
Concrete 36 newly filled in the bottom gap 11d
It is pressed through and is restored to a certain pressure density and held.

Whether or not the pressing force is obtained by slightly pushing back the bottom compression head 22d is determined by the pressure gauge 37 provided in the hydraulic circuit on the pressing side of the lining jack 10 connected to the compression head 22n of each part, or the pressing force. The detection device can be visually determined.

While pulling back the bottom compression head 22d and filling new concrete 36 into the bottom gap 11d, the other side lower compression heads 22c, side upper compression heads 22b, and top compression heads 22a press the previous concrete 35. By keeping the state as it is, the collapse of the concrete 35 extruded rearward into the gap 11n of each part and the downward flow thereof are suppressed in the previous step.

As described above, the bottom compression head 22d is pulled back,
When the filling of the new concrete 36 into the bottom gap 11d and the bottom gap 11d is completed, then, in the bottom gap 11c on both sides and / or either side, in the same way as in the bottom gap 11d, the bottom compression head is pressed. 22c is pulled back forward, and a new concrete 36 is filled in the void formed between the side lower compression head 22c and the previously extruded concrete 35.

In the same manner, the gaps 1 of the respective parts, which are sequentially higher than the bottom gap 11d, are formed.
1n, and finally, the compression head 2 at each part of the top gap 11a.
While pulling back 2n, a new concrete 36 is filled in each part gap 11n, and finally each part compression head 22n is slightly pushed back, and each part gap 11 of the concrete 35 extruded last time is pushed through the filled concrete 36.
Whether or not the corresponding part of n has been re-consolidated, the pressing force is confirmed by the pressure gauge 37 or the pressing force detection device,
As shown in FIG.
Located at the front end of the.

In the above process, the lining device is divided into the gaps 11n in the respective parts, and the respective lower compression heads 22n can be artificially arbitrarily pushed and pulled. Either of the filling may be performed first, but by sequentially pulling back the compression heads 22n from the bottom, filling new concrete and re-consolidating the concrete 35 extruded last time. Therefore, the lower reconsolidated part can be prevented from loosening again. Therefore, as a whole, the uncured concrete that has already been extruded rearward from the shield machine 1 is filled with new concrete 36 in its front part, and the concrete 35 extruded last time in the ground is Suppressing loosening, collapse or flow to a minimum, maintaining a tightly packed state and preventing the collapse of the ground, the previously extruded concrete 35 is uniformly consolidated over the front circumference, and before that The part is filled with new concrete 36.

When concrete is filled in the gaps 11n in the respective parts as described above, the propelling jack 9 is then actuated as shown in FIG. 8 to be connected to the rod 32, and the inner formwork previously assembled. The push plate 33 that has been pressing 30a is shortened by the rod 32 and pulled back forward, and a new inner mold frame 30b is assembled in the inner cylinder 12 by connecting it to the previously assembled inner mold frame 30a.

The inner formwork 30 is formed so as to have a gap 31 between the inner formwork 30 and the inner cylinder 12, and facilitates bending of the shield machine 1 when propelled. Moreover, the packing 14 attached to the rear end of the inner cylinder 12 prevents the concrete pushed out to the rear of the shield machine 1 from flowing into the gap 31.

The assembly of the new inner formwork 30b may be carried out concurrently with the step of filling the space 11n with concrete.

Next, as shown in FIG. 9, the propelling jack 9 is operated to extend the rod 32, and the front end face of the new inner formwork 30b is pressed by the pressing plate 33 to move the shield machine 1 While propelling, the lining jack 10 is operated to extend the rod 23, and the compression head 22n of each part simultaneously presses the concrete 36 filled in the gap 11n of each part rearward. By the propulsion of the shield machine 1, the outer cylinder 2 and the inner cylinder 12 both move forward, and the outer cylinder 2 and the inner cylinder 1 move.
The concrete 36 filled in the gaps 11n between the respective parts formed between the second and second parts is pressed by the compression heads 22n of the respective parts, and after the forward movement of the outer cylinder 2 and the inner cylinder 12, the ground 34 and the inner formwork. It is extruded into the tail void between 30 and consolidated.

In this way, when the extension stroke of the propulsion jack 9 is completed, the propulsion of the shield machine 1 is stopped, and at the same time, the compression heads 22n of the respective parts are moved to the rear of the inner cylinder 12 as shown in FIG. So that it reaches a certain position on the edge,
The pressing of the concrete filled in each gap 11n is stopped.

However, as described above, the excavation of the rock mass by the shield machine often becomes larger than the planned excavation cross section of the rock mass due to the collapse and the overexcavation.

In the lining apparatus of the present invention, the concrete volume filled in the gaps 11n in each part is expressed by (total cross-sectional area of gaps in each part) × (stroke length of compression head in each part), and the assumed cover The volume of the engineered concrete is represented by (cross-sectional area between the ground and the inner formwork) × (propulsion length of one step of the shield machine), and both are set to be substantially equal. Therefore, if the excavated ground has a collapse or an overexcavation, the concrete pushed out to the tail void of the shield machine 1 will run short.

Since the lining device of the present invention can detect the pressing force of the compression heads 22n of the respective parts against the concrete filled in the gaps 11n of the respective parts, the change of the pressing force can be observed during the pressing of the concrete. Then, it is possible to know the filling state of the corresponding portion of each gap 11n of the concrete extruded into the tail void.

Generally, a portion where the extruded concrete is densely filled in the ground 34 has a high pressing force, and a portion where the concrete is insufficient has a low pressing force. As a result, the concrete flows downward, so that the lower part of the lining maintains a high pressing force, and there is insufficient concrete from the side part to the upper part of the lining, and the pressing force decreases.

Therefore, when there is a portion where the concrete is insufficient and is not in a close-packed state, that is, in the specific gap 11x corresponding to the portion where the pressing force is low, for example, in the top gap 11a,
After the pressing of the concrete by each part compression head 22n is completed, an appropriate amount of concrete is replenished in the top part gap 11a in the same manner as the above-mentioned filling of new concrete into each part gap 11n, and the top part compression head By re-pressing 22a so that it has an appropriate pressing force, even if the excavated ground has collapsed or overexcavated, it will be connected to the previously extruded concrete and the entire circumference of the new concrete will be A lining for one step will be formed of concrete that has been homogeneously consolidated across.

In the above process, since the lining device is divided into the gaps 11n in each part, if there is a shortage of concrete extruded backward, concrete is replenished in the specific gap 11x corresponding to that part. It is possible,
Further, since the injection pipe 24 is opened on the rear surface of each portion compression head 22n so that the concrete can be filled into each portion gap 11n, an appropriate amount of concrete can be simultaneously obtained by pulling back the appropriate compression head 22x with an appropriate stroke. ,
It is possible to replenish while suppressing the flow of concrete that has already been extruded rearward.

By repeating the above steps and propelling the shield machine, a shield tunnel lining made of continuous cast-in-place concrete is formed between the ground behind the shield machine and the inner formwork. .

EFFECTS OF THE INVENTION In a conventional shield tunnel lining device using cast-in-place concrete, in the rear part of the shield tunnel, the gap between the inner formwork and the outer plate is filled with concrete, and an annular pressing ring is formed. Thus, while the filled concrete was pressed, in the lining device of the present invention, the gap between the outer cylinder and the inner cylinder is divided into a plurality of gaps by the partition plates. Thus, the compression heads of the respective parts are arbitrarily pressed back and forth or pulled back in the spaces of the respective parts, and concrete is filled in the spaces of the respective parts by an injection pipe penetrating the compression heads of the respective parts.

Therefore, according to the lining apparatus of the present invention, as described in the embodiment, in the previous step, the concrete filled in the gaps of the respective parts was pushed by the compression heads of the respective parts together with the promotion of the shield machine. After being pressed and pushed out between the ground behind the shield machine and the inner formwork, the compression heads of the other parts are stopped pushing, and the bottom compression head is pulled back in the bottom gap and extruded the last time. By filling the empty space formed between the concrete and the bottom compression head with new concrete, and then pulling back the compression head in each part and filling the gap in each part with the concrete in the upper part gaps. ,
Even if the previously extruded concrete is uncured, it suppresses collapse and flow into the gaps of each part, maintains the densely packed state of the previously extruded concrete, and creates a new over the entire circumference of each part gap. Can be filled with concrete and in the prior art, a gable formwork is provided to fill or
While the concrete extruded last time was hardened by filling it with new concrete, according to the present invention, the concrete extruded last time is uncured without providing a gable form. In addition, it is possible to continuously fill new concrete and pour lining concrete, increasing the efficiency of the tunnel tunnel excavation.

When new concrete is filled in the gaps of each part, the compressed head of each part simultaneously presses the filled concrete, and the shield machine is propelled. Extrude concrete between the frame.

However, when the ground excavated by the shield machine has collapsed or overexcavated, and the concrete pushed out to the rear has a part where the concrete is insufficient, in the conventional technology, this part Whereas it was difficult to reconsolidate by replenishing the concrete with, the lining device of the present invention detects the pressing force of the compression head of each part, thereby , It is possible to know the filling state of the relevant part of each part gap, the compression head of each part completes the pressing of the concrete filled in each part gap, and the thrust of the shield machine is completed, after which it is extruded to the rear. In a specific gap corresponding to the concrete-deficient part of the concrete, for example, the top gap, pull back the top compression head and put an appropriate amount of concrete in the top gap. It is possible to re-consolidate by filling in and pressing again with the top compression head to replenish the part of the concrete that lacks concrete, and then re-consolidate that part. It is possible to form a concrete lining that adheres closely to the ground and is uniformly consolidated over the entire circumference.

Further, in the present invention, an inner cylinder is provided separately from the inner formwork and connected to the shield machine, and a gap is provided between the inner formwork and the inner formwork continuously assembled from the rear in the inner formwork. As described above in the lining method according to Japanese Patent Application No. 63-281377, it is possible to facilitate bending of the shield machine by forming the inner cylinder. Since they are fixedly connected and supported in parallel and concentrically with the outer cylinder of the machine, the gaps between the inner cylinder and the outer cylinder can be easily divided by the partition plates.

[Brief description of drawings]

1 is a vertical cross-sectional view of a shield machine equipped with a lining device of the present invention, and FIGS. 2 and 3 are enlarged vertical cross-sectional views of different portions of the rear part of the shield machine shown in FIG.
FIG. 4 is a sectional view taken along the line AA of FIG. 2, FIG. 5 is a sectional view taken along the line BB of FIG. 2, and FIGS. 6 to 9 show the shield tunnel by the lining device of the present invention. A lining method and process drawings for explaining the operation of the lining apparatus, FIG. 10 and FIG. 11 show a conventional lining method. 1 ... Shield machine, 2 ... Outer cylinder, 11 ... Gap, 11a ...
Top gap, 11b ... side upper gap, 11c ... side lower gap,
11d ... bottom gap, 11n ... each gap, 11x ... specific gap, 12 ... inner cylinder, 15 ... partition plate, 22 ... compression head, 22
a ... top compression head, 22b ... side upper compression head, 22
c ... side lower compression head, 22d ... bottom compression head, 22
n ... Each part compression head, 22x ... Specific compression head, 24 ...
Injection pipe, 30 ... inner mold, 30a ... inner mold used last time, 3
0b ... new inner formwork, 31 ... void, 37 ... pressure gauge

Claims (3)

[Claims] 1. An outer cylinder formed in a cylindrical shape of a shield machine, and (b) a clearance provided between the outer cylinder and the outer cylinder so as to have an appropriate space. The frame fixed to the outer cylinder, the front end is connected by a connecting device, the inner cylinder with a packing attached to the rear end, and (c) the inside of the gap, is erected vertically in the longitudinal direction,
By means of a partition plate fixedly attached to either the inner cylinder or the outer cylinder, each part gap formed by dividing the gap into a plurality of parts, and (d) each part gap provided, The cross section of the gap is closed, and the compression heads that are slidably formed in the front and back are attached, and (e) the rear end is opened by attaching it to the rear surface of the compression head, and the front end communicates with the concrete pump. An injection pipe adapted to be filled with concrete at the rear part of each part of the compression head, and (f) connected to each part of the compression head, and pressing each part of the compression head to the rear or pull back to the front. A lining jack provided as described above, and (g) an inner formwork formed in the inner cylinder so as to be continuously assembled from the rear and having an appropriate gap between the inner cylinder and the inner cylinder, (H) To promote the shield machine, A propelling jack that presses the internal formwork, and (b) between the concrete that is extruded from the gaps between the parts by the compression heads for each part and the compression heads for each part, and pull back to the front of the compression heads for each part. A shield tunnel lining device made of cast-in-place concrete, comprising: sensing means for sensing the pressing force of the compression heads applied to the new concrete injected from the injection pipe in the void formed by. 2. A positive scale capable of displaying the hydraulic pressure of a hydraulic circuit,
The sensing means is constituted by a pressure gauge attached to a hydraulic circuit on the pressing side of the lining jack, which comprises a subscale capable of displaying the pressing force of the compression head of each part converted by the hydraulic pressure. ) Equipment for shield tunnel lining with cast-in-place concrete. 3. The cast-in place according to claim 1, wherein the sensing means is constituted by a pressure gauge having an output adjusting device which is in mechanical or electrical communication with a hydraulic circuit on the pressing side of the lining jack. Equipment for lining shield tunnels with concrete.