JP2006118238A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent damage to a segment tubular body or an increase in jacking resistance, when the segment tubular body is brought into contact with a clearance regulating member for regulating a gap between a main body part of the shield machine and the segment tubular body. <P>SOLUTION: A clearance regulating part 120, which is installed on the inner surface of the skin plate 3 of the shield machine, has a contact relaxing means for reducing pressing pressure or sliding resistance when the segment tubular body 7 is brought into contact with the skin plate 3. The contact relaxing means comprises: a movement support mechanism which is equipped with a belt 52 forming a contact part, a roller 51 subjected to the freely movable winding of the belt 52, and a roller supporting frame 53 for rotatably holding the roller 51; and a cushion mechanism which is equipped with a cushion material 121 for elastically supporting the frame 53. Furthermore, a lubricating mechanism for pressure-feeding a lubricant to the belt 52 or the roller 51 is provided, or a covering mechanism for installing an elastic body on the side of the outer surface of the belt 52 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shield machine used when constructing tunnels, sewers and the like (hereinafter collectively referred to as “excavation pits”) in the ground, and in particular, installed in a main body part and excavation mine of a shield machine. The present invention relates to a shield machine having a clearance regulating member that regulates a clearance with a segment cylindrical body.

  Conventionally, a shield machine has excavation means for excavating a natural ground (same as the ground) to create an excavation pit, and a cylindrical main body portion where the excavation means is installed at one end (hereinafter referred to as “front end”) , A cylindrical tail part installed at the rear end of the main body part, and a segment assembling means which is installed in the main body part and assembles the arc-shaped segment member into the cylindrical segment cylindrical body (same as the segment elector or the elector device) And a tail seal that seals the gap between the segment cylindrical body and the tail portion by pushing the assembled segment cylindrical body rearward and jacking up the body by the reaction force (same as the shield jack) And means for discharging the excavated earth and sand to the outside of the machine.

That is, in the shield machine, the segment cylindrical body is left behind in the excavation pit as the main body advances, and the segment cylindrical body is apparently pushed out of the main body. And since the internal diameter of the skin plate which forms the outer periphery of a main-body part is larger than the outer diameter of the segment cylindrical body assembled inside a main-body part, the inner surface of a skin plate and the outer surface of a segment cylindrical body are There is a predetermined gap (hereinafter referred to as “clearance”) between them.
A tail seal means is provided so that ground water, earth and sand, or a back-filling material (filled in the gap between the excavation mine and the segment cylindrical body) does not enter the main body portion via the clearance, and the tail seal In order to maintain the sealing effect of the means, a “tail shield clearance control method for a shield machine” that restricts the clearance to an optimum value is disclosed (for example, see Patent Document 1).

JP-A-5-18189 (page 3-4, FIG. 1)

  However, the technique disclosed in Patent Document 1 measures the dimensions of the skin plate or the segment cylindrical body, and determines the height of the gap regulating member based on the actual measurement value, whereby the skin plate and the segment cylindrical body are determined. Therefore, due to the following reasons, the construction period is extended due to the following reasons: In addition, there is a problem that the manufacturing cost increases due to the weight of the apparatus.

(A) When the segment cylindrical body comes into contact with the gap regulating member, the pressing pressure concentrates on the contact portion, so that the segment may be damaged (for example, a crack that penetrates may occur).
(B) Further, since the segment cylindrical body moves relative to the gap regulating member, the outer surface of the segment cylindrical body may be scratched (rubbed) at the contact portion, and the segment may be deformed.
(C) In particular, when the outer surface of the segmented tubular body is covered with a waterproof coating made of a resin in order to increase the water-stopping property, the waterproof coating may be damaged.
(D) Furthermore, since the segment cylindrical body in an excessively pressed state is relatively moved, the propulsion resistance increases, and it is difficult to reduce the size and weight of the device such as the jack means.

  The present invention has been made to solve such a problem, and even when the segment tubular body comes into contact with a clearance regulating member (referred to as a “clearance regulating member” in the present invention), the segment tubular body is provided. An object of the present invention is to obtain a shield machine having a clearance regulating member that can prevent damage such as damage and increase in propulsion resistance.

(1) A shield machine according to the present invention includes a main body portion formed in a cylindrical shape by a skin plate, an excavating means installed at a front end of the main body portion for excavating the ground, and installed in the main body portion. Erector means for assembling a cylindrical segment cylindrical body, jack means for moving the main body part to the front end side by pressing the segment cylindrical body to the rear end side, and installed at the rear end of the main body part, A clearance regulating member protruding on the inner surface of the skin plate,
The clearance regulating member includes contact relaxation means for reducing a pressing pressure or a sliding resistance when the segment cylindrical body comes into contact with the clearance regulating member.

  (2) Further, the contact relaxation means is a lubrication mechanism that supplies a lubricant to a contact portion with the segment cylindrical body.

  (3) Further, the contact relaxation means is a rotary contact mechanism or a movable contact mechanism that supports a contact portion with the segment cylindrical body in a rotatable or movable manner.

  (4) The contact relaxation means covers the contact portion with the segment cylindrical body so as to be able to advance and retreat in the thickness direction of the skin plate, or covers the contact portion with the segment cylindrical body with an elastic body. It is the covering mechanism to perform.

  Therefore, in the present invention, since the pressing pressure or sliding resistance when the segment cylindrical body comes into contact with the clearance regulating member is reduced, the segment itself and the waterproof coating coated on the outer surface of the segment cylindrical body are damaged. This prevents the increase in propulsion resistance.

  Hereinafter, first, an overall configuration of a “shielding machine” according to an embodiment of the present invention will be outlined, and then a “clearance regulating member” will be described with reference to the drawings.

(Shield machine)
FIG. 1 is a cross-sectional view for outlining the overall configuration of a shield machine according to an embodiment of the present invention. In FIG. 1, a shield machine 200 includes a cylindrical main body 1, a cutter head 2 at the front end (left side in the figure) of the main body 1 and excavating natural ground to create a drilling mine, and a main body Shield jack 4 for excavating 1 (same as advancing), screw conveyor 5 for discharging earth and sand excavated by the cutter head 2, and an erector apparatus 6 for assembling segments into an annular segment cylindrical body 7 And a tail seal 8 for preventing entry of groundwater or the like into the main body 1, a cylindrical tail plate 9 extending at the rear end of the main body 1, and a backing material injection means (not shown). Yes.

Since the segment cylindrical body 7 is assembled inside the main body 1, the outer diameter (radius) is naturally smaller than the inner diameter (radius) of the skin plate 3 that forms the outer periphery of the main body 1. Has a predetermined gap (hereinafter referred to as “clearance”). That is, the tail seal 8 is installed in a ring shape on the tail plate 9, for example, a watertight brush having flexibility, and the clearance is sealed watertight over the entire circumference.
Further, on the inner surface of the skin plate 3, a tail clearance regulating member 10 (which will be described in detail later) protruding toward the axis of the main body 1 (toward the outer surface of the segment cylindrical body 7) is installed. Has been.

Therefore, when the outer surface of the segment cylindrical body 7 approaches the inner surface of the skin plate 3, the outer surface of the segment cylindrical body 7 comes into contact with the tail clearance regulating member 10. There is no contact with the inner surface, and the tail seal 8 (for example, a watertight brush) is not pinched between the segment cylindrical body 7 and the tail plate 9.
At this time, since the tail clearance regulating member 10 includes contact relaxation means described later, the pressing pressure and sliding resistance at the contact portion between the outer surface of the segment cylindrical body 7 and the tail clearance regulating member 10 are reduced. Damage to the body 7 itself (same as the segment forming the same) and the waterproof coating (wrapping, not shown) coated on the outer surface of the segment tubular body 7 is prevented, and an increase in propulsion resistance is suppressed.

  Such an approach occurs when the pushing direction of the segment cylindrical body 7 is different from the forward direction of the main body 1 (same as the excavation direction), that is, when the excavation pit is bent. Therefore, the tail clearance regulating member 10 may be arranged evenly in the circumferential direction or may be arranged in a phase where such approach is predicted.

The illustrated shield machine 200 is an example, and the present invention is not limited to this. For example, the cutter head 2 may be a center support type, an outer periphery support type, or a multi-axis other than the single axis shown in addition to the intermediate support type shown in the figure. In addition to the implantable cutter, the cutter head 2 is equipped with a disk cutter (rotating), fish tail (projecting at the center of rotation), etc., corresponding to the characteristics of the natural ground (composite ground, etc.) On the other hand, the copy cutter 2c (advancing and retreating toward the side surface) may be removed.
Note that the “tail seal structure of a shield machine” according to the present invention is also installed in a manual digging shield machine from which the cutter head 2 has been removed.

In addition, the main body 1 may be a sealed type in which the front surface is sealed or an open type in which the front surface is opened, in which a plurality of cylindrical bodies are arranged in a refractive manner (having a middle folding mechanism), or a plurality The substantially cylindrical bodies may be arranged in parallel (for example, having an approximately eight-character cross section).
The earth and sand discharging mechanism 5 may be a muddy water type shield type in addition to the screw conveyor type shown in the figure.
Further, the quantity and model of the tail seal 8 are not limited.
Furthermore, a holding means for holding the formed segment cylindrical body 7 in a predetermined shape (for example, a perfect circle) may be provided.

2 to 7 schematically show tail clearance regulating members of a shield machine according to an embodiment of the present invention, in which (a) is a partial sectional view and (b) is a partially sectional plane, respectively. FIG.
8 to 12 are partial cross-sectional views schematically showing tail clearance regulating members of the shield machine according to the embodiment of the present invention.
Each of the tail clearance regulating members described in FIGS. 2 to 12 is installed in the shield machine, either individually or in combination. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and a part of the description is omitted.

(Tail clearance regulating member 1: Lubrication mechanism)
In FIG. 2, a tail clearance regulating member 10 (hereinafter referred to as “regulating member 10”) is installed in the shield machine 200 and includes a lubrication mechanism as a contact relaxation means.
That is, the restricting member 10 opens in the middle of the fixed sleds 11a and 11b and the fixed sleds 11a and 11b that are fixed near the rear end of the skin plate 3 that is a plate member that forms the cylindrical main body 1. It has a lubricant outlet 12, a lubricant pumping hole 13 communicating with the lubricant outlet 12, and a lubricant pumping means (not shown) (lubricant pumping pump, lubricant storage tank, etc.) connected to the lubricant pumping hole 13. is doing. That is, the fixed sleds (saddles) 11a and 11b (the same applies to the lubricant outlet 12) are arranged in a predetermined amount in the circumferential direction of the skin plate 3, and further, the lubricant pressure feed holes 13 are formed toward the lubricant outlet 12. Since the lubricant (for example, grease) is pumped through, the surfaces of the fixed sleds 11a and 11b are in a state where the lubricant is applied.

Therefore, when the outer surface of the segment cylindrical body 7 approaches the inner surface of the skin plate 3, the outer surface of the segment cylindrical body 7 comes into contact with the fixed sleds 11 a and 11 b. There is no contact with the inner surface, and the tail seal 8 is not pinched between the segment cylindrical body 7 and the tail plate 9.
Further, even if the segment cylindrical body 7 moves in such a contact state, the frictional resistance is reduced by the lubricant, so that damage to the outer surface of the segment cylindrical body 7 is suppressed, and an increase in propulsion resistance is prevented. . In particular, when the outer surface of the segment cylindrical body 7 is covered with a waterproof coating made of resins in order to increase the water-stopping property, damage to the waterproof coating is prevented.

  The material forming the fixed sleds 11a and 11b is not limited. For example, if formed by a resin such as hard nylon or natural or artificial hard rubber, the fixed sleds 11a and 11b are deformed at the time of such contact, and the contact area is enlarged, and the local pressing pressure and sliding resistance are increased. Therefore, prevention of damage to the segment cylindrical body 7 itself and prevention of damage to the waterproof coating are promoted.

  Further, the arrangement form (quantity, interval, series arrangement, staggered arrangement, etc.), size, and shape of the fixed sleds 11a, 11b are not limited, and only one of the fixed sled 11a or the fixed sled 11b is installed, or A third fixed sled may be installed. Further, the lubricant pressure feed hole 13 may be branched in the middle, or a distribution means may be installed in the middle.

(Tail clearance regulating member part 2: Lubrication mechanism)
In FIG. 3, a tail clearance regulating member 20 (hereinafter referred to as “regulating member 20”) has a lubrication mechanism as a contact relaxation means.
That is, the restricting member 20 includes a fixed sled 21 that is fixed near the rear end of the skin plate 3, a lubricant outlet 22 that passes through the fixed sled 21, and a lubricant pressure feed hole 23 that communicates with the lubricant outlet 22. And a lubricant pumping means (not shown) (lubricant pump, lubricant storage tank, etc.) connected to the lubricant pumping hole 23 (see FIGS. 3A and 3B). Therefore, since the surface of the fixed sled 21 is surely covered with the lubricant, the restricting member 20 has the same function and effect as the restricting member 10 described above.

The material, size, shape, and the like that form the fixed sled 21 are not limited, and the size, shape, and the like of the lubricant outlet 22 are not limited. For example, the fixed sled 21 may be formed of a porous material (powder sintered material or the like), and the material may be impregnated with a lubricant. At this time, the lubricant pumping hole 23 reaches the back surface of the fixed sled 21, and the porous portion (hole) in the fixed sled 21 is regarded as the lubricant outlet 22.
Furthermore, the present invention is not limited to the one in which the surface of the fixed sled 21 is smooth. For example, the fixed sled 21 shown in FIG. 3C is provided with grooves 24 on the surface thereof so that the lubricant can easily spread over the entire surface. The grooves 24 are not limited to a single line, but may be a plurality of radial or cross-shaped lines.

(Tail clearance regulating member 3: Rotating contact mechanism)
In FIG. 4, a tail clearance regulating member 30 (hereinafter referred to as “regulating member 30”) includes a rotary contact mechanism as a contact relaxation means.
That is, the regulating member 30 is installed near the rear end of the skin plate 3 and integrates the sphere 31, a pair of sphere holding members 32 a and 32 b that rotatably hold the sphere 31, and the sphere holding members 32 a and 32 b. It has joining means 33 (for example, bolt).

  The sphere 31 is formed of a resin such as hard nylon or natural or artificial hard rubber. Therefore, since the regulating member 30 can be regarded as the one in which the fixed sled 11a, 11b or 21 in the above-described regulating member 10, 20 (fixed sled having a lubrication mechanism) is replaced with a rotatable sphere 31, the above-described regulating member. Like 10 and 20, it has the effect and effect of reducing the pressing pressure and sliding resistance acting on the contact portion. In particular, since the sphere 31 rotates in such a contact state, the sliding resistance is significantly reduced.

The material and size of the sphere 31 or the installation form is not limited, and a lubricant outlet is provided in the vicinity of the sphere holding members 32a and 32b of the skin plate 3 according to the circulation mechanism described above. If a lubricant outlet penetrating the sphere holding member 32a and facing the sphere 31 is provided, the effects of the rotary contact mechanism and the lubrication mechanism can be obtained synergistically.
Further, the circular blind hole for installing the regulating member 30 is formed in the skin plate 3. However, the present invention is not limited to this, and a through hole is formed in the skin plate 3, and the through hole is formed. The outer peripheral side of the hole may be closed with a support plate.

(Tail clearance regulating member 4: Rotating contact mechanism)
In FIG. 5, a tail clearance regulating member 40 (hereinafter referred to as “regulating member 40”) includes a rotary contact mechanism as a contact relaxation means.
That is, the restricting member 40 is installed near the rear end of the skin plate 3, and may be referred to as rollers (same as a cylindrical body) 41a, 41b, 41c and rollers 41a, 41b, 41c (hereinafter collectively referred to as “roller 41”). Rotating shafts 42 a, 42 b, 42 c (which may be collectively referred to as “rotating shaft 42” hereinafter) and a rotating shaft support frame 43 that supports the rotating shaft 42. . At this time, the roller 41 is rotatable with respect to the rotation shaft 42, or the rotation shaft 42 is rotatable with respect to the rotation shaft support frame 43.

  Therefore, when the segment cylindrical body 7 comes into contact with the roller 41, the roller 41 bends and conforms to the outer surface of the segment cylindrical body 7, so that the contact area increases and the local pressing pressure is relieved. Since the roller 41 rotates in the contact state, the sliding resistance is significantly reduced. Therefore, damage to the segment cylindrical body 7 itself (the same as the segment forming the same) is prevented, and particularly when the outer surface of the segment cylindrical body 7 is covered with a waterproof coating, the waterproof coating is damaged. In addition, an increase in propulsion resistance is suppressed.

  The material of the roller 41 (for example, resin such as hard nylon, natural or artificial hard rubber, etc.), size, shape (for example, drum shape, etc.) or the number of rollers 41 to be installed is not limited. If the lubricant is applied directly or indirectly to the roller 41 or the rotating part in accordance with the circulation mechanism, the effects of the rotating contact mechanism and the lubricating mechanism are produced synergistically. Further, a bearing may be provided between the roller 41 and the rotating shaft 42 or between the rotating shaft 42 and the rotating shaft support frame 43.

(Tail clearance regulating member 5: moving contact mechanism)
In FIG. 6, a tail clearance regulating member 50 (hereinafter referred to as “regulating member 50”) is provided with a moving contact mechanism as a contact relaxation means.
That is, the regulating member 50 is installed near the rear end of the skin plate 3, and surrounds the rollers (same as the cylindrical body) 51a, 51b, 51c (hereinafter sometimes referred to collectively as “roller 51”) and the roller 51b. The belt 52 wound around the rollers 51a and 51c and the roller support frame 53 that supports the roller 51 rotatably.

  Therefore, when the outer surface of the segment cylindrical body 7 comes into contact with the belt 52, the belt 52 is slightly deformed to increase the contact area, so that the pressing pressure acting on the contact portion is reduced. Further, the apparent resistance of the segment cylindrical body 7 moves the belt 52 (corresponding to the rotation between the rollers 51a and 51c), so that the sliding resistance is relaxed. Therefore, the same operation and effect as the above-described regulating member 40 are exhibited.

  The material and size (thickness and width) of the belt 52, and the material and size of the roller 51 and the number of belts to be installed are not limited. Further, if the lubricant is applied directly or indirectly to the front surface or the back surface of the belt 52 in accordance with the above-described circulation mechanism, the effects of the moving contact mechanism and the lubrication mechanism are produced synergistically. Further, the roller 51 may have a cylindrical portion and a shaft portion separately formed, the shaft portion may be fixed to the roller support frame 53, and the cylindrical portion and the shaft portion may be freely rotatable.

(Tail clearance regulating member 6: rotational movement contact mechanism)
In FIG. 7, a tail clearance regulating member 60 (hereinafter referred to as “regulating member 60”) includes a rotational movement contact mechanism (same as “chill tank”) as a contact relaxation means.
That is, the regulating member 60 is installed near the rear end of the skin plate 3, and a plurality of rollers (same as a cylindrical body) 61, and the rollers 61 can freely rotate (same as rotation) and circulate endlessly (endlessly). The roller circulation frame 62 is supported freely (same as revolution).

Therefore, when the outer surface of the segment cylindrical body 7 comes into contact with the roller 61, the roller 61 moves while rotating, so that the same operations and effects as the above-described regulating members 40 and 50 are exhibited.
Note that the material, size, shape, or number of the rollers 61 is not limited, and the lubricant may be applied directly or indirectly to the rollers 61 or the circulation portion according to the circulation mechanism described above. Thus, the effects of the rotational movement contact mechanism and the lubrication mechanism are produced synergistically.

(Tail clearance regulating member 7 to 12: cushion mechanism)
8 to 12, tail clearance regulating members 70, 80, and 120 (hereinafter referred to as “regulating members 70, 80, and 120”) are added as cushioning mechanisms to the cushioning mechanism. It comprises.

In FIG. 8A, a restricting member 70 is a member in which the fixed sleds 11a and 11b of the restricting member 10 (see FIG. 2) are installed on the skin plate 3 via cushioning materials 71a and 71b. is there.
Therefore, when the outer surface of the segment cylindrical body 7 comes into contact with the inner surface of the skin plate 3, the impact load is relieved, so that the outer surface of the segment cylindrical body 7 is further prevented from being damaged.

Further, since the cushion materials 71a and 71b are elastically compressed and deformed, the outer surface of the segment cylindrical body 7 contacts the restriction member 70 closest to the same, and at the same time the restriction member 70 disposed in the vicinity thereof. In contact with each other, that is, the outer surface of the segment cylindrical body 7 is in contact with the plurality of regulating members 70, the pressing pressure is dispersed, and the sliding resistance is further reduced. Therefore, the action and effect of the above-described regulating member 10 are promoted.
The material and size of the cushion materials 71a and 71b are not limited, and may be a resin such as urethane, rubber, or a compression spring.

  In FIG. 8B, the restricting member 80 is a member in which the fixed sled (blade) 21 of the restricting member 20 (see FIG. 3) is installed on the skin plate 3 via the cushion material 81. Therefore, like the restriction member 70, the action and effect of the restriction member 20 are promoted. At this time, the cushion material 81 is provided with a through hole through which the lubricant passes.

In FIG. 9, the regulating member 90 is a member in which the spherical body holding member 32 a of the above-described regulating member 30 (see FIG. 4) is installed on the skin plate 3 via the cushion material 91. Therefore, the function and effect of the regulating member 30 are promoted as described above.
At this time, a through groove for installing the regulating member 90 is formed in the skin plate 3, the outer peripheral side of the through groove is closed by the support plate 3a, and the regulating member 90 is dropped on the inner peripheral side of the through groove. Prevention means (not shown) are installed. The installation procedure is not limited, and a recess having a predetermined depth may be formed from the inner peripheral side.

In FIG. 10A, the regulating member 100 is moved by the rotating shaft support frame 43 with the roller 41 of the regulating member 40 (see FIG. 5) contacting the cushion material 101 installed on the skin plate 3. It is held freely.
Therefore, when the outer surface of the segment cylindrical body 7 comes into contact with the roller 41, the roller 41 retreats and deforms to reduce the impact, and rotates to reduce the sliding resistance. Therefore, the action and effect of the regulating member 40 are promoted.

At this time, the cushion material 101 receives part or all of the pressing pressure from the skin plate 3. Further, if the rigidity of the roller 41 (second moment of cross section, etc.) and the flexibility of the cushion material 101 (elastic coefficient, etc.) are adjusted, the roller 41 will be deformed to a predetermined extent and become familiar with the outer surface of the segment cylindrical body 7. Therefore, the contact area increases.
The manner in which the rotating shaft support frame 43 holds the roller 41 is not limited. The rotating shaft support frame 43 can be held by a circular hole having an inner diameter larger than the outer diameter of the rotating shaft 42 of the roller 41, You may hold | maintain by the elongate hole etc. which comprise the long diameter part larger than a diameter. Further, after the cushion material 101 is deformed by a predetermined amount, the rotating shaft support frame 43 may receive a part of the pressing pressure.

In FIG. 10B, the regulating member 110 is configured such that the rotating shaft support frame 43 of the regulating member 40 (see FIG. 5) is installed on the substrate 44, and the substrate 44 is installed on the skin plate 3 via the cushion material 111. It has been done. Therefore, the action and effect of the regulating member 40 are promoted as described above.
In addition, an independent rotation shaft support frame and a substrate are provided for each of the rollers 41a... 41e so that each substrate abuts against the cushion material 101 so that each of the rollers 41a. It may be.

  In FIG. 11A, the regulating member 120 is a member in which the belt 52 of the regulating member 50 (see FIG. 6) is supported by a cushion material 121 installed on the skin plate 3. Therefore, when the outer surface of the segment cylindrical body 7 comes into contact with the belt 52, the belt 52 retreats and deforms to reduce the impact, and moves to reduce the sliding resistance. Therefore, the action and effect of the regulating member 50 are promoted. At this time, the roller 51 is held movably by the rotating shaft support frame 53, but the roller 51 (which is rotatable) is made immovable with respect to the rotating shaft support frame 53, and the rotating shaft support frame 53 is skinned. You may install so that it can advance / retreat with respect to the plate 3.

  In FIG. 11B, the regulating member 130 is a member in which the roller support frame 53 of the above-described regulating member 50 (see FIG. 6) is installed on the skin plate 3 via the cushion material 131. Therefore, the action and effect of the regulating member 50 are promoted as described above. At this time, the entire surface of the substrate 54 fixed to the roller support frame 53 is in contact with the cushion material 131. Alternatively, an independent roller support frame and substrate may be provided for each of the rollers 51a... 51e, and each of the rollers 51a... 51e may advance and retreat independently, that is, the belt 52 may wave.

  In FIG. 12, the regulating member 140 is a member in which the roller circulation frame 62 of the above-described regulating member 60 (see FIG. 7) is installed on the skin plate 3 via the cushion material 141. Therefore, the function and effect of the regulating member 60 are promoted as described above. Moreover, the point which installs the roller circulation frame 62 in the skin plate 3 in order to prevent slipping out is not limited.

(Tail clearance regulating member and others: Covering mechanism)
As described above, the materials for forming the fixed sleds 11a, 11b, 12, the sphere 31, the roller 41, or the belt 52 in the restricting members 10, 20, to 140 are limited, but they are integrally formed. However, the present invention is not limited to this, and a composite formed by a plurality of materials may be used.
For example, a contact portion (same as the outer surface of the fixed sleds 11a, 11b, 12, the sphere 31, the roller 41, or the belt 52) that contacts the outer surface of the segment cylindrical body 7 is surrounded by an elastic body having a predetermined thickness, The contact portion may be subjected to a surface treatment that reduces the friction coefficient. At this time, the effect of reducing the pressing pressure, in particular, the effect of reducing the impact load and the effect of reducing the sliding resistance are further enhanced. Therefore, the damage prevention effect of the waterproof coating coat | covered on the segment itself and the outer surface of the segment cylindrical body and the increase suppression effect of propulsion resistance are further accelerated | stimulated.

  As described above, according to the present invention, it can be widely used as various shield machines equipped with a clearance regulating member that prevents contact between the main body and the segment cylindrical body.

Sectional drawing which outlines the whole structure of the shield machine which concerns on embodiment of this invention. The schematic diagram which shows the tail clearance control member 1 of a shield machine. The schematic diagram which shows the tail clearance control member 2 of a shield machine. The schematic diagram which shows the tail clearance control member 3 of a shield machine. The schematic diagram which shows the tail clearance control member 4 of a shield machine. The schematic diagram which shows the tail clearance control member 5 of a shield machine. The schematic diagram which shows the tail clearance control member 6 of a shield machine. The schematic diagram which shows the tail clearance control members 7 and 8 of a shield machine. The schematic diagram which shows the tail clearance control member 9 of a shield machine. The schematic diagram which shows the tail clearance control members 10 and 11 of a shield machine. The schematic diagram which shows the tail clearance control members 12 and 13 of a shield machine. The schematic diagram which shows the tail clearance control member 14 of a shield machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Cutter head 3 Skin plate 3a Support plate 4 Shield jack 5 Screw conveyor 6 Elector apparatus 7 Segment cylindrical body 8 Tail seal 9 Tail plate 10 Tail clearance regulation member 1
11a Fixed sled 11b Fixed sled 12 Lubricant outlet 13 Lubricant pressure feed hole 20 Tail clearance regulating member 2
21 Fixed sled 22 Lubricant outlet 23 Lubricant pressure feed hole 30 Tail clearance regulating member 3
31 Spherical body 32a Spherical body holding member 32b Spherical body holding member 33 Joining means 40 Tail clearance regulating member 4
41a to 41e Rollers 42a to 42e Rotating shaft 43 Rotating shaft support frame 44 Substrate 50 Tail clearance regulating member 5
51a to 51e Roller 52 Belt 53 Roller support frame 54 Substrate 60 Tail clearance regulating member 6
61 Roller 62 Roller circulation frame 70 Tail clearance regulating member 7
71a cushion material 71b cushion material 80 tail clearance regulating member 8
81 Cushion material 90 Tail clearance regulating member 9
91 Cushion material 100 Tail clearance regulating member 10
101 Cushion material 110 Tail clearance regulating member 11
111 Cushion material 120 Tail clearance regulating member 12
121 Cushion material 130 Tail clearance regulating member 13
131 Cushion Material 140 Tail Clearance Control Member 14
141 Cushion Material 200 Shield Machine

Claims (4)

A main body formed in a cylindrical shape by a skin plate;
Excavation means installed at the front end of the main body and excavating the ground;
Elector means installed in the main body and assembling the segments into a cylindrical segment cylindrical body;
Jack means for moving the main body to the front end side by pressing the segment cylindrical body to the rear end side;
A shield machine having a clearance regulating member installed at a rear end of the main body portion and protruding from an inner surface of the skin plate;
The shield machine according to claim 1, wherein the clearance regulating member includes contact relaxation means for reducing a pressing pressure or a sliding resistance when the segment cylindrical body comes into contact with the clearance regulating member.   2. The shield machine according to claim 1, wherein the contact relaxation means is a lubrication mechanism that supplies a lubricant to a contact portion with the segment cylindrical body.   3. The shield machine according to claim 1 or 2, wherein the contact relaxation means is a rotary contact mechanism or a movable contact mechanism that rotatably or movably supports a contact portion with the segment cylindrical body. A cushion mechanism in which the contact relaxation means supports the contact portion with the segment cylindrical body so as to be able to advance and retreat in the thickness direction of the skin plate, or a covering mechanism that covers the contact portion with the segment cylindrical body with an elastic body. The shield machine according to any one of claims 1 to 3, wherein the shield machine is provided.

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