Abutment structure of shield jack spreader

Abstract

To provide an abutment structure that abuts an abutment face of a spreader connected to a rear end of a piston rod via a spherical joint in a stable state, thereby preventing a biased load from being applied to a tip end face of a covering body.SOLUTION: An abutment buffer member 15 consisting of a pair of plate members 13, 14 is attached to a rear end surface 12a of a spreader 11. The pair of plate members 13, 14 are arranged one on top of the other with a gap S maintained. Engagement recesses 13b, 14b to which a vibration-isolating rubber member 16 is attached are formed on opposing surfaces 13a, 14a of the plate members 13, 14. The vibration-isolating rubber member 16 is attached between the opposing surfaces 13a, 14a of the plate members 13, 14 by fixing one base metal piece 16b to the engagement recess 13b in the opposing surface 13a of one plate member 13 and fixing the other base metal piece 16b to the opposing surface 14a of the other plate member 14.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a contact structure of a shield jack spreader, and in particular to a spreader connected to the rear end of the piston rod of a shield jack constituting a shield tunneling machine via a spherical joint, and to a contact structure of a shield jack spreader that abuts against the tip surface of a covering body made of assembled segments to obtain an excavation reaction force. [Background technology]

[0002] A shield tunneling machine is a well-known tunneling machine that is capable of forming shield tunnels even in soft underground ground, such as in urban areas.The shield tunneling machine is preferably covered with a cylindrical steel outer shell, and excavates the tunnel face with a rotating cutter at the tip, while receiving an excavation reaction force from a lining made of segments assembled at the rear of the shell, and extends the shield jack to excavate the tunnel.

[0003] Furthermore, in order to obtain an excavation reaction force from the rear segment lining, shield tunneling machines employ a structure in which an abutment member known as a spreader is attached to the rear end of the piston rod that constitutes the shield jack, and the abutment face of the spreader is pressed against and supported by the leading edge of the assembled segment lining. For example, when a shield tunneling machine is used to excavate a curved tunnel, the extension direction of the piston rod of the shield jack fixed to the outer shell of the shield tunneling machine may tilt from a direction perpendicular to the leading edge of the segment lining. Therefore, the spreader is preferably connected to the rear end of the piston rod via a known spherical joint so that it can swing at any angle, thereby absorbing such directional deviation and allowing the abutment face of the spreader to abut perpendicularly against the leading edge of the lining.

[0004] On the other hand, if the spreader, which abuts its abutment face against the tip surface of the lining body, is swivellably connected to the rear end of the piston rod via a spherical joint, for example, when the shield jack is retracted and new segments are assembled at the rear of the outer shell to form the lining body, and then the piston rod of the shield jack is extended again to abut the spreader's abutment face against the tip surface of the lining body, the spreader may abut against the lining body while tilted downward due to its own weight when extended, which may cause a biased load to be applied to the tip surface of the lining body during excavation, which may cause a malfunction of the lining body.

[0005] For this reason, a technology has been developed to prevent malfunctions in the lining body by preventing the spreader, which is connected to the rear end of the piston rod via a spherical joint, from abutting against the lining body while remaining in a downwardly tilted state when extended, thereby preventing uneven loads from being applied during excavation (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 8-135367 Summary of the Invention [Problem to be solved by the invention]

[0007] In the shield tunneling machine propulsion device described in Patent Document 1, an elastic body is installed between the rear end of the shield jack's piston rod and the spreader so that it can elastically deform when the spreader attempts to tilt at least vertically and horizontally, thereby essentially preventing the spreader from tilting in these directions, and also so that if the spreader attempts to tilt beyond a predetermined angle with respect to the spherical joint portion at the rear end of the shield jack's piston rod that is greater than the maximum tilting angle required for using the spreader, it will hit the spherical joint portion and stop the tilting.

[0008] However, with the shield tunneling machine propulsion device described in Patent Document 1, while it is possible to effectively prevent the spreader from tilting due to its own weight before it abuts on the tip surface of the lining, it is not possible to eliminate the tilt, so it is necessary to further improve the structure of the abutment part to prevent malfunctions in the lining during excavation. In particular, if an uneven load is applied to the lining when the abutment face of the spreader abuts on the tip surface of the segmented lining, this could affect the excavation operation of the shield tunneling machine, so it is necessary to prevent uneven loads as much as possible from being applied to the tip surface of the lining, which is used to obtain an excavation reaction force.

[0009] The present invention aims to provide a contact structure for the spreader of a shield jack that allows the contact face of the spreader, which is connected to the rear end of the piston rod of the shield jack via a spherical joint, to contact the tip surface of a lining body made of assembled segments in a more stable state when the contact face is brought into contact with the tip surface of the lining body, which is used to obtain an excavation reaction force, thereby minimizing the application of biased loads to the tip surface of the lining body. [Means for solving the problem]

[0010] The present invention relates to an abutment structure of a shield jack spreader for obtaining an excavation reaction force by abutting a spreader connected via a spherical joint to the rear end of a piston rod of a shield jack constituting a shield tunneling machine against the front end surface of a lining body made of assembled segments, and a contact cushioning member consisting of a pair of flat plate members is attached to the rear end surface of the contact face plate of the spreader, and the contact cushioning member is formed by one of the plate members being joined integrally to the rear end surface of the contact face plate, and the other plate member being placed on top of the one of the plate members while maintaining a gap of 3 to 10 mm, and an engagement recess for engaging an anti-vibration rubber member is provided on the opposing surfaces of both the one and the other plate members sandwiching the gap, or on the opposing surface of either one of the plate members, and the anti-vibration rubber members are formed at at least three locations on the opposing surfaces of the plate members, and the anti-vibration rubber members have a structure in which base metal members with attachment rod portions set up vertically in the center are fixed to the end surfaces on both sides of a pillar-shaped anti-vibration rubber main body, and the total thickness of the base metal members is smaller than the total depth of the attachment recesses. These anti-vibration rubber members are fixed such that at least one of the base metal members is fixed to the bottom surface of the attachment recess formed on the opposing surface of one of the plate members by engaging the attachment rods with the attachment holes, and the other base metal member is fixed to the opposing surface of the other plate member by engaging the attachment rods with the attachment holes, thereby providing an abutment structure for the spreaders of the shield jacks attached between the opposing surfaces of the one plate member and the other plate member, and achieving the above-mentioned object.

[0011] In the contact portion structure of the shield jack according to the present invention, the pair of plate members forming the contact buffer member are preferably each formed using a resin plate.

[0012] In addition, it is preferable that the abutment structure of the spreader of the shield jack of the present invention is such that a filler material made of hard rubber is installed between the pressing end surface of the piston rod of the shield jack, where the spherical joint portion is provided, and the tip surface of the spreader to suppress tilting of the spreader.

[0013] Furthermore, in the contact portion structure of the spreader of the shield jack of the present invention, it is preferable that the other plate member forming the contact buffer member is connected to the contact face plate of the spreader via a wire member. [Effects of the Invention]

[0014] According to the contact structure of the spreader of the shield jack of the present invention, when the contact face of the spreader connected to the rear end of the piston rod of the shield jack via a spherical joint is brought into contact with the tip surface of the lining body made of assembled segments, the contact can be made in a more stable state, thereby minimizing the application of biased load to the tip surface of the lining body used to obtain excavation reaction force. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic longitudinal cross-sectional view of the main parts of the piston rod and spreader of a shield jack of a shield tunneling machine, illustrating the contact structure of the spreader of the shield jack according to a preferred embodiment of the present invention. [Figure 2] 1 is a schematic cross-sectional view of a portion of a spreader of a shield tunneling machine, illustrating the abutment structure of the spreader of a shield jack according to a preferred embodiment of the present invention. FIG. [Figure 3] This is the upper surface of the contact surface and contact buffer member of the spreader. [Figure 4] FIG. 10 is a front view of one plate member of the contact cushioning member. [Figure 5] FIG. 10 is a front view of the other plate member of the contact cushioning member. [Figure 6] FIG. 4 is an enlarged view of part A in FIG. 3. [Figure 7] FIG. 4 is a side view illustrating an example of a vibration-isolating rubber member. DETAILED DESCRIPTION OF THE INVENTION

[0016] As shown in Figure 1, the shield jack spreader abutment structure 10 according to a preferred embodiment of the present invention is employed as an abutment structure in a known shield tunneling machine 20, such as an earth pressure type or a mud water type, in which, while receiving an excavation reaction force from a lining body 22 made of segments 22a assembled at the rear of an outer shell 21, the shield jack 23 is extended to excavate the tunnel while excavating the face with a rotary cutter (not shown) at the tip, and the spreader 11 connected to the rear end of a piston rod 24 constituting the shield jack 23 via a spherical joint 25 is brought into stable abutment with the tip surface 22b of the lining body 22 made of assembled segments 22a. The abutment structure 10 of this embodiment has the function of abutting the abutment face plate 12 of the spreader 11 connected to the rear end of the piston rod 24 of the shield jack 23 in a more stable state when it is abutted against the tip surface 22b of the lining body 22 made of assembled segments 22a, thereby minimizing the load imposed unevenly on the tip surface 22b of the lining body 22, which is used to obtain an excavation reaction force.

[0017] The abutment structure 10 of this embodiment is a structure of the abutment of the spreader 11 of the shield jack 23, which is connected to the rear end of the piston rod 24 of the shield jack 23 constituting the shield tunneling machine 20 via a spherical joint 25, against the front end surface 22b of the lining 22 made of assembled segments 22a, to obtain an excavation reaction force, and an abutment cushioning member 15 consisting of a pair of flat plate members 13, 14 is attached to the rear end surface 12a of the abutment face 12 of the spreader 11. As shown in Figure 3, the abutment cushioning member 15 is formed by one plate member 13 being joined integrally to the rear end surface 12a of the abutment face 12 of the spreader 11, and the other plate member 14 being arranged overlapping the one plate member 13 while maintaining a gap S of 3 to 10 mm. 4 and 5, on the opposing surfaces 13a, 14a of both the one plate member 13 and the other plate member 14 sandwiching the gap S, or on the opposing surfaces 13a, 14a of either one of the plate members 13, 14 (preferably on both opposing surfaces in this embodiment), engagement recesses 13b, 14b for engaging with the vibration-isolating rubber member 16 are formed in at least three locations on these opposing surfaces 13a, 14a, and preferably four locations (see FIGS. 4 and 5). As shown in FIGS. 6 and 7, the vibration-isolating rubber member 16 has a structure in which base metal fittings 16b, each having an engagement rod portion 16c standing vertically in the center, are fixed to both end surfaces of a columnar vibration-isolating rubber main body 16a, and the total thickness T of the base metal fittings 16b is smaller than the total depth D of the engagement recesses 13b, 14b. These vibration-damping rubber members 16 are attached between the opposing surfaces 13a, 14a of one plate member 13 and the other plate member 14 by fixing at least one base metal member 16b to the bottom surface of the engagement recess 13b, 14b formed in the opposing surface 13a, 14a of one of the plate members 13, 14 by engaging the engagement rod 16c with the engagement hole 13c, 14c, and by fixing the other base metal member 16b to the bottom surface of the engagement recess 13b, 14b of the opposing surface 13a, 14a of the other plate member 13, 14 by engaging the engagement rod 16c with the engagement hole 13c, 14c.

[0018] In addition, in this embodiment, as shown in Figure 1, a filler material 17 made of hard rubber is installed between the pressing end surface 24a of the piston rod 24 of the shield jack 23, which is preferably provided with a spherical joint portion 25, and the tip surface 11a of the spreader 11 to suppress tilting of the spreader 11 due to its own weight.

[0019] In this embodiment, as shown in Fig. 2, the shield jacks 23 are attached at a plurality of locations at predetermined intervals around the circumferential direction of the ring girder 26 by fastening cylinder portions 23a (see Fig. 1) to the ring girder 26, which is an annular plate-shaped ring girder that is joined and fixed integrally to the shell body 21 of the shield machine 20 so as to protrude inward from the shell body 21 at the intermediate portion in the tunnel axis direction of the shell body 21. Accordingly, the spreader 11 and the contact buffer member 15 that are attached integrally to the rear end of the piston rod 24 are also installed at a plurality of locations at predetermined intervals around the circumferential direction. As also shown in Figs. 4 and 5, the contact face plate 12 of the spreader 11 and the pair of flat plate members 13, 14 that constitute the contact buffer member 15 each have a generally isosceles trapezoidal front shape, with the inner and outer edges curved along the curved shape of the annular plate-shaped ring girder 26.

[0020] In this embodiment, the contact face plate 12 of the spreader 11 is made of a steel plate member having a thickness of, for example, about 40 mm, and as described above, has a generally isosceles trapezoidal front shape with an inner edge width of about 550 mm, an outer edge width of about 670 mm, and a side edge width of about 320 mm. A rear end surface 12a of the contact face plate 12 to which one plate member 13 of the contact buffer member 15 is joined has a plurality of female screw holes (not shown) for fastening fixing bolts, which are formed in a dispersed manner at predetermined positions corresponding to the fastening joint holes 13d formed in one plate member 13 of the contact buffer member 15. A wire fastener 19, preferably having a ring-shaped fastening portion 19a, is attached to the center of the side end surface at one side edge of the contact face plate 12.

[0021] One plate member 13 constituting the contact buffer member 15 is preferably formed using a resin plate, such as a polytetrafluoroethylene nylon plate with a thickness of about 25 mm, and as shown in Figure 4, has a generally isosceles trapezoidal front shape similar to, but slightly smaller than, the contact face plate 12 of the spreader 11. On the front surface of one plate member 13, which forms the surface 13a facing the other plate member 14, there are formed, preferably in four locations, engagement recesses 13b with an inner diameter of, for example, about 50 mm and a depth of, for example, about 10 mm. In the center of the bottom of each engagement recess 13b, there is formed an engagement hole 13c, preferably a female screw hole, for engaging an engagement rod 16c erected from the base metal 16b of the vibration-isolating rubber member 16.

[0022] Furthermore, one plate member 13 has a plurality of fastening holes 13d formed therein that are dispersed at predetermined positions corresponding to the female screw holes formed in the abutment face plate 12 of the spreader 11. The fastening holes 13d are used to fasten fixing bolts (not shown) for integrally joining the one plate member 13 to the abutment face plate 12 of the spreader 11. By aligning the multiple fastening holes 13d of the one plate member 13 with the female screw holes in the abutment face plate 12 of the spreader 11 and fastening the fixing bolts, the one plate member 13 can be firmly joined as an integral unit in a state where it is superimposed on the abutment face plate 12 of the spreader 11 and is in close contact with it.

[0023] The other plate member 14 constituting the contact buffer member 15 is also preferably formed using a resin plate, such as a polytetrafluoroethylene resin plate with a thickness T of about 25 mm, and as shown in Fig. 5, has a generally isosceles trapezoidal front shape similar to, but slightly smaller than, the contact face plate 12 of the spreader 11. On the back side of the other plate member 14, which forms the surface 14a facing the one plate member 13, engagement recesses 14b having an inner diameter of, for example, about 50 mm and a depth D of, for example, about 10 mm are formed in preferably four locations corresponding to the engagement recesses 13b of the one plate member 13. On the front side opposite the surface 14a facing the one plate member 13, nut fastening recesses 14e having an inner diameter of, for example, about 25 mm and a depth of, for example, about 10 mm are formed in four locations overlapping the engagement recesses 14b. An engagement hole 14c is formed between the center of the bottom of the engagement recess 13b and the center of the bottom of the nut fastening recess 14e, through which an engagement rod 16c standing upright from the base metal 16b of the vibration-damping rubber member 16 is inserted and engaged via the nut member 18.

[0024] Furthermore, the other plate member 14 has a plurality of operation through holes 14d formed in a dispersed arrangement at predetermined positions corresponding to the fastening and joining holes 13d formed in one plate member 13. These through holes enable the operation of joining the contact buffer member 15 integrally to the contact face plate 12 from the surface side of the other plate member 14 by aligning the multiple fastening and joining holes 13d of one plate member 13 with the female screw holes of the contact face plate 12 of the spreader 11 and tightening the fixing bolts. By interposing a vibration-isolating rubber member 16 between the other plate member 14 and the one plate member 13, the other plate member 14 is connected to the one plate member 13 so as to be slidable relative to the one plate member 13 in a state where they are overlapped with each other while maintaining a gap S of, for example, 3 mm between them, and forms the contact buffer member 15 integrated with the one plate member 13.

[0025] Furthermore, a wire locking device 19, preferably having a ring-shaped locking portion 19a, is attached to the center of the side end surface of one side edge of the other plate member 14. By connecting the ring-shaped locking portion 19a of the wire locking device 19 attached to one side edge of the other plate member 14 and the ring-shaped locking portion 19a of the wire locking device 19 attached to one side edge of the contact face plate 12 of the spreader 11 via a wire member 19b (see FIG. 3), it is possible to effectively prevent the other plate member 14 from falling, even if the other plate member 14, which is connected to one plate member 13 via an anti-vibration rubber member 16, falls off the first plate member 13 for some reason. Note that, because the impact of the falling of the other plate member 14 is greatest on the parts arranged in the upper half of the shield machine, the wire locking device 19 may be provided only on the other plate member 14 in the upper half.

[0026] By using resin plates for one plate member 13 and the other plate member 14, when one plate member 13 and the other plate member 14 are in close contact with each other and further shear force is applied to the abutment structure 10, the plate members 13 and 14 can be slid relatively to each other to absorb such shear force. It is further preferable that a lubricant be applied to the opposing surfaces 13a and 14a of these plate members 13 and 14 that come into contact with each other.

[0027] The vibration-isolating rubber member 16, which constitutes the contact cushioning member 15 together with the one plate member 13 and the other plate member 14, has a structure in which base metal members 16b with an attachment rod portion 16c standing vertically in the center are fixed to both end faces of a columnar vibration-isolating rubber main body 16a, as shown in Figures 6 and 7. As the contact cushioning member 15 having such a structure, for example, a commercially available round vibration-isolating rubber manufactured by Ohno Rubber Industry Co., Ltd. can be used.

[0028] The vibration-isolating rubber body 16a of the vibration-isolating rubber member 16 is made of a rubber material, for example, containing natural rubber and having a hardness of approximately HS55±5, and has a flat, cylindrical shape, for example, with a diameter of approximately 34 mm and a height of approximately 16 mm. Metal base metals 16b are integrally joined and attached to the lower and upper end faces of the vibration-isolating rubber body 16a. Each base metal 16b has a disk shape, for example, with a diameter of approximately 40 mm and a thickness T of approximately 3 mm, and is attached integrally to each base metal 16b, standing at a height of approximately 32 mm from the center, with an attachment rod portion 16c, preferably a male-threaded bolt member with a screw diameter of approximately 8 mm. Since each base metal piece 16b has a thickness T of about 3 mm, their total thickness 2T is smaller than the total depth 2D of the engagement recess 13b of one plate member 13 and the engagement recess 13b of the other plate member 13, which has a depth D of about 10 mm, for example.

[0029] The vibration-damping rubber member 16 can be fixed to the engaging recess 13b of one of the plate members 13, for example, by screwing and engaging an engaging rod portion 16c formed by a male threaded bolt member of one of the base hardware 16b into an engaging hole 13c formed by a female threaded hole at the bottom of the engaging recess 13b, as shown in Figure 6. Furthermore, the vibration-damping rubber member 16 can be fixed to the engagement recess 13b of one plate member 13 by inserting the engagement rod portion 16c of the other base metal member 16b of the vibration-damping rubber member 16 into the engagement hole 14c of the engagement recess 14b of the opposing surface 14a of the other plate member 14, while the other base metal member 16b is attached to the engagement recess 14b, and then by screwing and tightening a nut member 18 onto the tip portion of the engagement rod portion 16c inserted into the engagement hole 14c and protruding from the nut fastening recess 14e on the opposite side of the opposing surface 14a, the engagement rod portion 16c can be engaged with the engagement hole 14c, thereby fixing the vibration-damping rubber member 16 to the engagement recess 14b of the other plate member 14.

[0030] As a result, the multiple vibration-damping rubber members 16 are each attached between the opposing surfaces 13a, 14a of one plate member 13 and the other plate member 14, and by overlapping the other plate member 14 with a gap S of, for example, 3 mm between it and the one plate member 13 and connecting it so that it can slide relatively to the one plate member 13, it is possible to form an abutment buffer member 15 in which the other plate member 14 and the one plate member 13 are integrated and can move relatively.

[0031] Furthermore, according to this embodiment, as described above, a hard rubber filler 17 is attached between the pressing end surface 24a of the piston rod 24 of the shield jack 23, which is preferably provided with a spherical joint 25, and the tip surface 11a of the spreader 11 to suppress tilting of the spreader 11 due to its own weight (FIG. 1). As a result, the spreader 11 is swivellably connected to the pressing end surface 24a at the rear end of the piston rod 24 via the spherical joint 25. For example, with the shield jack 23 contracted, new segments 22a are assembled at the rear of the outer shell 21 to form the lining body 22, and then the piston rod 24 of the shield jack 23 is extended again to bring the contact face plate 12 of the spreader 11 into contact with the tip surface 22b of the lining body 22. This makes it possible to effectively suppress the spreader from tilting downward due to its own weight when extended.

[0032] In the abutment structure 10 of the shield jack spreader of this embodiment having the above-mentioned configuration, a contact buffer member 15 made of a pair of plate members 13, 14 is joined to the rear end surface 12a of the abutment face plate 12. Therefore, when the piston rod 24 of the shield jack 23 is extended to abut the abutment face plate 12 of the spreader 11 against the front end surface 22b of the lining body 22, even if the abutment face plate 12 is slightly tilted, after the other plate member 14 abuts against the front end surface 22b of the lining body 22 first, the pair of plate members 13, 14 are moved relative to each other by elastic deformation of the vibration-damping rubber main body 16a of the multiple vibration-damping rubber members 16 until one plate member 13 is in close contact with the other plate member 14, and distortion caused by such a tilt can be absorbed.

[0033] As a result, according to the abutment structure 10 of the spreader of the shield jack of this embodiment, when the abutment face 12 of the spreader 11 connected to the rear end of the piston rod 24 of the shield jack 23 via the spherical joint portion 25 is brought into abutment against the tip surface 22b of the lining body 22 made of the assembled segments 22a, it abuts in a more stable state, thereby minimizing the load imposed on the tip surface of the lining body 22, which is used to obtain excavation reaction force, and effectively avoiding malfunctions during the excavation operation of the lining body or the shield tunneling machine.

[0034] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, the engagement recesses do not necessarily have to be formed on both opposing surfaces of the pair of plate members of the contact cushioning member, and may be formed on only one of the opposing surfaces as long as the pair of plate members can be closely attached. The engagement recesses do not necessarily have to be formed in four locations on each opposing surface, and may be formed in three or five or more locations. The vibration-isolating rubber member and the engagement recesses do not necessarily have to have a circular cross-sectional shape, and may have a rectangular, polygonal, or other cross-sectional shape. The plate members do not necessarily have to be formed using a resin plate, and may be metal plate members. [Explanation of symbols]

[0035] 10. Contact structure of shield jack spreader 11 Spreader 11a Tip surface 12 Contact face plate 12a Rear end surface 13 One plate member 13a Opposite surface 13b Engagement recess 13c Attachment hole 13d Fastening joint hole 14 Other plate member 14a Opposite surface 14b Engagement recess 14c Attachment hole 14d Operation through hole 14e Nut fastening recess 15 Contact buffer material 16 Anti-vibration rubber member 16a Anti-vibration rubber body 16b Base hardware 16c Attachment rod part 17 Filling material 18 Nut material 19 Wire fastener 19a Ring-shaped locking portion 19b Wire member 20 Shield tunneling machine 21 Exoskeleton 22 Lining body 22a segment 22b Tip surface 23 Shield Jack 23a Cylinder section 24 Piston rod 24a Pressing end surface 25 Spherical joint 26 Ring Garter D Depth of the engagement recess T Thickness of base metal S interval part

Claims

1. A spreader connected to the rear end of the piston rod of the shield jack constituting the shield tunneling machine via a spherical joint is brought into contact with the tip surface of the lining body made of assembled segments to obtain an excavation reaction force. A contact buffer member made of a pair of flat plate members is attached to the rear end surface of the contact surface of the spreader, The contact cushioning member is formed by one of the plate members being integrally joined to the rear end surface of the contact face plate, and the other plate member being overlapped with the one of the plate members while maintaining a gap of 3 to 10 mm therebetween, engagement recesses for engaging with vibration-proof rubber members are formed in at least three locations on the opposing surfaces of both of the one plate member and the other plate member sandwiching the gap portion, or on the opposing surface of either one of the plate members; The vibration-proof rubber member has a structure in which base metals with attachment rods vertically erected in the center are fixed to both end faces of a columnar vibration-proof rubber body, and the total thickness of the base metals is smaller than the total depth of the attachment recesses, These vibration-damping rubber members are fixed by fixing at least one of the base metal members to the bottom surface of the attachment recess formed on the opposing surface of one of the plate members by engaging the attachment rod with the attachment hole, and by fixing the other base metal member to the opposing surface of the other plate member by engaging the attachment rod with the attachment hole, thereby creating an abutment structure with the spreaders of the shield jacks attached respectively, interposed between the opposing surfaces of one of the plate members and the other plate member.

2. 2. The shield jack contact structure using a spreader according to claim 1, wherein the pair of plate members forming the contact cushioning member are each formed using a resin plate.

3. 3. A shield jack spreader abutment structure according to claim 1 or 2, wherein a filler material made of hard rubber is installed between the pressing end surface of the piston rod of the shield jack, on which the spherical joint portion is provided, and the tip surface of the spreader to suppress tilting of the spreader.

4. 3. The shield jack contact structure according to claim 1, wherein the other plate member forming the contact cushioning member is connected to the contact face of the spreader via a wire member.

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