JPH09268892A - Lining segment in shielding work, tail seal part cleaning method for shield machine making use of the segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a back-till material fixed between tail seals for cleaning without disassembling/withdrawing a segment corresponding to the tail seal, or exposing the segment from the tail end. SOLUTION: The work is changed to the lining by the regular segment when a tail seal part 30 is cleaned by advancing a shield machine, and a lining ring is assembled using an opening part 1205 for cleaning and a segment 120 for cleaning having its shielding plate 130. The part of the tail seal 30 is moved to the position opposite to the opening part 1205 of the segment 120 for cleaning by advancing the shield machine, and in this condition, each shielding plate 130 is opened by a hydraulic jack 140 to open each opening part 1205, the back- fill material fixed between the tail seals 30 is removed through the opening part 1205, and the tail seal parts are cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Regarding a lining segment used for lining a shield construction for constructing an underground structure such as a railroad and a method for cleaning a tail seal part of a shield machine using the segment, more specifically, a tail seal part of a shield body is fixed. The present invention relates to a lining segment that facilitates removal and cleaning of a bound backfill material and a method for cleaning a tail seal part of a shield machine using the segment.

[0002]

2. Description of the Related Art During the construction of a shield for sewers, etc., while excavating a face using a rotary cutter of a shield machine, the shield jack propels the entire machine in the direction of the machine, and the excavated skids are excavated by a screw conveyor. Carry out. Then, the excavation operation of the shield machine is stopped every time a predetermined amount is excavated, and the segments are assembled by the erector device in the tail portion of the shield body. After that, with the movement of the tail part due to the excavation operation of the shield machine, a gap formed between the inner periphery of the excavated space and the outer periphery of the segment, that is, the tail void is filled with injection material such as mortar and backfilled. By doing so, the ground is stabilized.

Such a segment functions as a reaction force body for propelling the shield machine, and also as a space retention for the excavated portion. Further, the size of the tail void is determined by the thickness of the tail portion, the margin for assembling the segment in the tail portion, the inclination angle of the segment according to the radius of curvature in the tail portion during curved construction, and the like. Therefore, if the tail void is left as it is, it may cause collapse of the ground in the excavation portion or subsidence of the ground. Therefore, it is necessary to perform backfill injection of mortar or the like into the tail void to quickly fill and solidify. On the other hand, a tail seal is attached to the rear end of the tail part of the shield machine, and this tail seal prevents groundwater and sediment from flowing into the shield machine from the tail void and leakage of backfill injection material. To prevent. However, in the actual shield work, the backfill injection material gradually flows out through the tail seal to the inside of the shield excavator, so the backfill injection material gradually accumulates and is solidified between the two tail seals. . Therefore, the allowance for assembly of the segment (tail clearance)
It often becomes difficult to assemble the segment or correct the direction of the shield machine, or it may cause the segment to be deformed or damaged. Also, a large tail clearance is required for shield construction with steep curves, so if the segment outer diameter is made smaller than the normal segment, the lap margin between the tail seal and the segment will decrease, and the segment will tilt in the tail section. As a result, the followability deteriorates with respect to the tail seal segment, and the back-filling injection material often flows into and solidifies between the tail seals. When the shield excavation shifts to straight line construction after escaping the curve in such a state of the tail and after assembling the normal segment, the shield excavator is propelled,
The backfill injection material solidified in the tail seal portion increases the propulsive force of the shield machine and causes deformation of the segment, breakage of the tail seal, and deformation of the tail portion. Therefore, when the backfill injection material is solidified in the tail seal portion, it is necessary to remove and clean the solidified backfill injection material in the tail seal portion.

Conventionally, as such a cleaning method, the segment corresponding to the tail seal portion is dismantled and removed, and the solidified portion of the backfilling injection material is exposed, and the solidified portion is removed and cleaned. Later, there is a method of reassembling the segments. Or, interpose a reaction force material between the shield jack and the segment to propel the shield machine until the solidified portion of the backfill injection material is exposed from the most advanced segment,
The method of assembling the segments was adopted after removing the solidified portion exposed in this state and cleaning it.

[0005]

However, the above-mentioned cleaning method has the following problems. A) Behind the predetermined segment assembly position (tail side)
Since the segment is disassembled or assembled in, the erector device cannot be used, and segment disassembly or assembly becomes a manual operation. B) Disassembling the entire segment 1 ring, exposing the outer portion of the tail of the solidified portion, removing and cleaning the solidified portion, and reassembling sequentially, which requires a lot of time and makes these operations complicated. Become. C) During the work of removing and cleaning the solidified portion, there is little wrapping margin between the tail end and the segment, so if the soil or water is exposed from the tail void side, it is not possible to quickly prevent the exposure. D) In order to prevent the exposure of earth and sand or water, a method is used in which the tail portion is solidified by injecting a chemical solution from the ground surface such as on the road before disassembling the segment, but the work is complicated. However, there is a problem that the economy is lacking.

The present invention has been made in view of the above-mentioned points, and it is possible to remove the segment corresponding to the tail seal by disassembling and removing the segment from the tail end, and to secure the solid backing between the tail seals. It is an object of the present invention to provide a lining segment for shield construction in which the filler can be easily removed and cleaned, and a method for cleaning a tail seal part of a shield machine using the segment.

[0007]

In order to achieve the above-mentioned object, the present invention assembles a lining ring by assembling in a ring shape along the inner circumference of an excavation space excavated by propelling a shield machine in the ground. At least one lining segment for shield construction, which is for constructing and arranging each lining ring that is sequentially assembled with the promotion of the shield machine, for removing and cleaning the solidified backfilling material. It is characterized in that an opening is formed and a shielding means is provided to shield the opening so that the opening can be opened and closed. The present invention is also such that the shielding means is opened and closed by drive means supported by the segment. The invention also provides that the drive means is removably supported on the segment. In the present invention, the shielding means is composed of a plate material slidably provided on the inner wall surface of the segment, and the driving means is composed of a hydraulic jack.

In the shield work, the present invention also relates to the movement of the tail portion by the propulsion operation of the shield machine,
When the tail void formed between the inner periphery of the excavated excavation space and the outer periphery of the lining segment is filled with backfill material, the solid backfill remaining in the tail seal part of the shield machine is removed and cleaned. A method for cleaning a tail seal part of a shield machine, comprising: forming an arbitrary lining ring, which is sequentially assembled along with the promotion of the shield machine, with a segment having a cleaning opening and a shielding means for the opening, and performing the cleaning. The tail seal part is made to face by propelling the shield machine to the lining ring part for operation, and the shielding means is operated to open the opening part, and then the solid part stays in the tail seal part from the opening part. It is characterized by removing the backing material and cleaning.

In the present invention, when the tail seal portion needs to be cleaned, the lining is changed to a normal segment,
The lining ring is assembled using the segment having the cleaning opening and its shielding means, and the tail seal part is moved to the position facing the opening of the cleaning segment by propelling the shield machine. In this state, each shielding means is opened to open each opening, the back-filling material fixed to the tail seal is removed through this opening, and the tail seal is cleaned. Therefore, the backfill material solidified between the tail seals can be easily removed and cleaned without disassembling and removing the segment corresponding to the tail seal or exposing the segment from the tail end.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a mud pressure type shield excavator to which a lining segment and a cleaning method according to the present invention are applied, FIG. 2 is a side view seen from an arrow A direction in FIG. 1, and FIG. 3 is a tail seal in FIG. FIG. 4 is an enlarged cross-sectional view taken along line BB of FIG. 3, FIG. 5 is an enlarged cross-sectional view of an essential portion of the cleaning segment, and FIG. 6 is line CC of FIG. Fig. 7 is an enlarged view of the main part showing the details of the tail seal part when a normal segment is assembled and lined, Fig. 8 is a schematic side view showing the assembled state of the normal segment, and Fig. 9 is a diagram. 8 is a sectional view taken along line DD of FIG.

1 and 2, the mud pressure shield machine 10 has a cylindrical shield body 20, which is connected to a hood 201 and a rear end of the hood 201. A ring gutter section 202 and a tail section 204 continuously connected to the rear end of the ring gutter section 202 via a sealing material 203,
The tail seal 30 is provided in two stages at the rear end of the tail portion 204. At the front of the hood 201, a cutter disk 40 is provided with a large number of cutter bits 401 for cutting face excavation and a side cutter 402 for overcutting. The cutter disk 40 is supported by a partition wall 205 provided in the hood 201. It is rotatably supported via a portion 403, and is rotationally driven by a driving device 50 provided in the ring gutter portion 202. Further, a chamber 60 is formed between the cutter disk 40 and the partition wall 205 for retaining the earth and sand excavated by the cutter disk 40 in a filled state, and the earth and sand in the chamber 60 communicates with the chamber 60.
It is configured so that it can be discharged to the rear of the shield body 2 by means of a screw conveyor 70 provided with.

Reference numeral 80 denotes a center-folded jack that controls the direction of excavation of the shield body 20, the base of the center-folded jack 80 is connected to the tail portion 204, and the piston rod side thereof is connected to the ring garter portion 202. The intermediate folding jacks 80 are arranged at equal intervals in the circumferential direction of the ring gutter portion 202. Reference numeral 90 denotes a shield jack for propelling the shield body 20, and a plurality of shield jacks 90 are arranged at equal intervals in the circumferential direction of the ring gutter portion 202, one end of which is connected to the ring gutter portion 202, and the other. The end contacts the lining segment 110 assembled in a ring shape by the erector device 100 in the tail portion 204, and the shield body 20 is cut by the reaction force applied to the lining segment 110 when the shield jack 90 extends. It is configured so that it can be propelled in the direction.

Next, the structure of the ordinary lining segment 110 will be described with reference to FIGS. As shown in FIGS. 7 to 9, the lining segment 110 includes a main girder 1101 forming both side walls in the width direction, a joint plate 1102 forming both side walls in the arc direction of the main girder 1101, and both main girders 1101.
It is composed of a plurality of vertical ribs 1103 horizontally fixed between them and a skin plate 1104 covering the outer peripheral surface. The segment 110 thus configured is assembled in the tail portion 204 of the shield body 20 into a ring shape by the erector device 100 as shown in FIG. 8, and the space between the joint plates 102 of each segment 110 is shown in FIG. The lining rings are joined together by bolts and nuts 1105, and the adjacent lining rings are joined by tightening main girders 1101 that are butted against each other with bolts and nuts 1106.

Next, the structure of the cleaning segment 120 will be described with reference to FIGS. The cleaning segment 120 is assembled by changing to a normal segment lining at the time when the tail seal portion needs to be cleaned as the shield excavator advances, and its outer shape is almost the same as that of the normal lining segment 110. Although it has a similar structure, the difference from this lining segment 110 is that
As is apparent from FIG. 3, the skin plate of the segment has an opening and a device for shielding the opening. The segment of the present invention can be applied to a normal segment for a straight line, a reduced-diameter segment for a sharp curve, etc., but here, in the case of a reduced-diameter segment, which often causes a bad influence on the consolidation of the tail seal part, Show. Hereinafter, cleaning segment 12
Details of 0 will be described. The lining segment 110 having a large outer diameter is mainly used for lining a straight portion of the shield work, and the reduced diameter segment is mainly used for lining a sharp curve portion.

As shown in FIGS. 3 to 6, the cleaning segment 120 includes main girders 1201 forming side walls in the width direction,
Joint plate 12 forming both side walls of the main girder 1201 in the arc direction
02, a plurality of vertical ribs 1 horizontally fixed between both main girders 1201
203 and a skin plate 1204 covering the outer peripheral surface. Further, in the skin plate 1204 between the adjacent vertical ribs 1203, openings 1205 for removing and cleaning the solidified backfill material are formed so as to be offset to one side in the segment width direction. Opening 12
05 are opened and closed by the respective shield plates 130 provided inside the skin plate 1204. Shield plate 130
Are adjacent to the vertical ribs 1203 adjacent to each other and the opening 120
5 is slidably supported by a pair of guide members 1301 provided on both sides of the cleaning segment 120 and extending in the width direction of the cleaning segment 120, and the shield plate 130 is driven to open and close by a hydraulic jack 140. The hydraulic jack 140 is detachably attached to the cleaning segment 120 for each shield plate 130 when the shield plate 130 is opened and closed. For this reason, the base end of the hydraulic jack 140 is as shown in FIGS. As shown, the bracket 140 protruding from the main girder 1201
1 is detachably connected to the hydraulic jack 1 by a pin 1402, and the tip of the piston rod 140a of the hydraulic jack 140 is attached to the bracket 1302 provided on the shield plate 130 by the pin 1
It is detachably connected by 403.

In FIG. 3, 150 is a reduced diameter segment, and 160 is the backfill injection port 1 of the reduced diameter segment 150.
The backfill material injection valve 160 is connected to the backfill material 501.
0 is connected, and the backfilling material 210 that is pressure-fed from a backfilling material supply source such as mortar is not shown.
The tail void 190 formed between 80 is filled.

Next, the procedure for cleaning the lining of the cleaning segment and the cleaning of the tail seal portion in the present embodiment configured as described above will be described with reference to FIGS. 10 and 11. At the time when the tail seal portion needs to be cleaned, FIG.
As shown in (A), first, in the tail portion 204 of the shield body 20, the cleaning segment 120 is assembled by the erector device 100, and the cutter disk 40, the shield jack 90, and the screw conveyor 70 are driven to shield the machine 10. To dig one ring. Next, the normal lining segment 110 is similarly assembled by the erector device 100, and the shield machine 1
Similarly, 0 is dug up. With this excavation, the tail portion 20
The lining ring assembled in 4 is exposed to the outside of the shield body 20 from the rear end of the tail portion 204.

Next, the shield machine 10 is excavated in the same manner, and the tail seal 30 provided at the rear end of the tail portion 204 in two steps is located at the opening 12 of the cleaning segment 120.
05, when the shield machine 10 is stopped, the shield jack 130 is attached to each shield plate 130 of the assembled cleaning segment 120 as shown in FIG. 10B.
Assemble 40. After that, by supplying pressure oil to each hydraulic jack 140 from a hydraulic unit (not shown), the hydraulic jack 140 causes the piston rod 140a to extend as shown in FIG. 10 (C) to open each shield plate 130 and open each opening. The portion 1205 is opened.

Then, as shown in FIG. 11A, each hydraulic jack 140 is removed from the cleaning segment 120. In this case, when there is no hindrance to the cleaning of the inside of the tail seal 30, one of the pins, for example, the pin 1402 is pulled out and the hydraulic jack 140 is suspended by the pin 1403 as shown by the phantom line in FIG. Hold the state.
After that, as shown in FIGS. 11B and 11C, the backfill material 200 retained and solidified between the tail seals 30 is removed and cleaned using a tool or the like not shown. Tail seal 3
When cleaning between 0 and around the opening 1205 is completed,
As shown in FIG. 11D, the hydraulic jack 140 is attached again. Then, by supplying pressure oil to each hydraulic jack 140 from a hydraulic unit (not shown), the hydraulic jack 140 is contracted to close each shield plate 130,
Each opening 1205 is shielded. After the opening 1205 is shielded, the hydraulic jacks 140 are removed and the shield plate 1 is removed.
Fix 30. After the completion of cleaning, water blocking / lubricant (sealing grease) is injected from the opening 1205 between the tail seals 30 as needed.

As described above, according to the present embodiment, when it is necessary to clean the tail seal 30 portion by the excavation of the shield machine 10, the lining is changed to a normal segment, and the cleaning opening 1205 and the cleaning opening 1205 are formed. By assembling the lining ring using the cleaning segment 120 having the shield plate 130 and propelling the shield machine 10, the tail seal 30 is moved to a position facing the opening 1205 of the cleaning segment 120. In this state, each shielding plate 130 is opened by the hydraulic jack 140 to open each opening 1205, and the backfill material fixed between the tail seals 30 is removed through this opening 1205.
Since the tail seal portion can be cleaned, the backfill material fixed between the tail seals 30 can be easily carried out without disassembling and removing the segment corresponding to the tail seal 30 or exposing the segment from the tail end. Can be removed and cleaned.

The shielding plate 130 in the present invention is not limited to the one having the structure shown in the above embodiment. For example, a rotating shield plate may be used. Further, in the above embodiment, the case where the cleaning segment of the present invention is applied to the reduced diameter segment has been described, but the present invention is not limited to this,
It can also be applied to ordinary lining segments.

[0022]

As described above, according to the present invention, when the tail seal portion needs to be cleaned by the excavation of the shield machine, the lining is changed to a normal segment to replace the cleaning opening and the shielding means. Assemble the lining ring using the segment that has it, and move the tail seal part to the position facing the opening of the cleaning segment by propelling the shield machine, and in this state open each shielding means to The opening is opened, and the backfill material that is fixed to the tail seal part is removed through this opening so that the tail seal part can be cleaned.Therefore, the segment corresponding to the tail seal can be disassembled and removed, or the segment can be removed. The backfill material solidified between the tail seals can be easily removed and cleaned without exposing it from the tail end, and the cleaning work is easy. Sex is secured, it can shorten the construction period, an effect that economics can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a mud pressure shield machine to which a lining segment and a cleaning method according to the present invention are applied.

FIG. 2 is a side view as seen from the direction of arrow A in FIG.

FIG. 3 is an enlarged view of a main part showing details of a tail seal portion according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is an enlarged cross-sectional view of a main part of the cleaning segment according to the embodiment of the present invention.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is an enlarged view of a main part showing details of a tail seal portion when a normal segment is assembled and lined.

FIG. 8 is a schematic side view showing an assembled state of a normal segment.

FIG. 9 is a sectional view taken along the line DD in FIG. 8;

10 (A) to 10 (C) are explanatory views showing a procedure of cleaning the cleaning segment and cleaning the tail seal portion in the embodiment of the present invention.

11 (A) to (D) are explanatory views showing a procedure of cleaning the cleaning segment and cleaning the tail seal portion in the embodiment of the present invention.

[Explanation of symbols]

 10 Shield Excavator 20 Shield Body 204 Tail Part 30 Tail Seal 40 Cutter Disc 90 Shield Jack 100 Electa Device 110 Lining Segment 120 Cleaning Segment 1205 Opening 130 Shield Plate (Shielding Means) 140 Hydraulic Jack (Drive Means) 150 Shrink Diameter segment 190 Tail void 200 Solid backfilling material 210 Backfilling material

Claims (5)

[Claims] 1. A lining segment for shield construction which is assembled in a ring shape along an inner circumference of an excavation space excavated by propelling a shield machine to the ground to form a lining ring, At least one opening for removing and cleaning the solidified backfill material is formed in each segment that constitutes an arbitrary lining ring that is sequentially assembled with the progress of the shield machine, and the opening is shielded so as to be opened and closed. A lining segment for shield construction, characterized by being provided with a shielding means. 2. The lining segment for shield construction according to claim 1, wherein the shielding means is opened and closed by a driving means supported by the segment. 3. The lining segment for shield construction according to claim 2, wherein the drive means is attached to and detachably supported by the segment. 4. The lining segment for shield work according to claim 2, wherein the shielding means is composed of a plate material slidably provided on an inner wall surface of the segment, and the driving means is composed of a hydraulic jack. 5. In the shield work, a backfill material is provided in a tail void formed between the inner circumference of the excavated excavation space and the outer circumference of the lining segment along with the movement of the tail portion by the propulsion operation of the shield machine. A method for cleaning a tail seal part of a shield machine, which removes and cleans solidified backfill accumulated in a tail seal part of the shield machine when it is filled, and an arbitrary cover which is sequentially assembled along with the promotion of the shield machine. The work ring is composed of a segment having a cleaning opening and a shielding means for the opening, and the tail seal portion is opposed to the cleaning lining ring portion by propelling the shield machine to the shielding ring. Is operated to open the opening, and then the solidified back-filling material staying in the tail seal portion is removed from the opening and cleaned. Tail seal-part cleaning method of that shield machine. How to clean the seal part.