JP5177646B2 - Seal structure and concrete structure - Google Patents

Description

  The present invention relates to a seal portion structure used for a concrete structure such as a segment constituting a shield tunnel and a concrete structure provided with the seal portion structure, and in particular, prevents the occurrence of cracks or collapse of the concrete structure. The present invention relates to a seal structure and a concrete structure that can be used.

  Tunnel water stoppage is an important issue from the standpoint of impact on the surrounding environment and tunnel maintenance. However, since the segment of the shield tunnel has a shape in which the annular tube forming the tunnel is divided into a plurality of portions in the circumferential direction, there is a joint joint, and it is necessary to prevent water leakage from this portion. Therefore, a technique is generally employed in which a water-swellable sealing material is stretched around a seal groove formed on the outer periphery of the segment (see, for example, Patent Documents 1 to 3).

  As described in Patent Document 1, in the case of using a water-expandable sealing material, the volume of the seal groove is set to be water-expandable at the time of segment manufacture in consideration of the expansion coefficient of the water-expandable seal material generated after segment joining. It is larger than the volume of the sealing material. In the joint joint between the segments and the joint joint between the rings, the water-expandable seal materials of the adjacent segments are in contact with each other and pressed against each other and absorb moisture to expand, and finally the inside of the seal groove is water-expandable. Filled with sealing material.

  Moreover, since the corner | angular part of a segment forms a T-shaped or cross-shaped joint, a clearance gap is larger than the joint of other joints between segments and joints between rings. Therefore, in consideration of the lack of volume of the sealing material, the corner may be supplemented with the sealing material. However, in reality, the sealing material at the corners is excessive, and there are not a few cases where cracks and crushing occur in the segments. Even if the sealing material is not replenished to the corner, this phenomenon may occur due to excessive sealing material due to the sealing material of the inter-segment joint and the inter-ring joint being brought close to the corner. In order to prevent cracks and crushing at the corners of the segments caused by the compression of the sealing material, the invention described in Patent Document 2 partially cut off the corner sealing material, and described in Patent Document 3. In the invention, the strength of the seal groove of the segment is increased.

Utility Model Registration No. 2511717 JP 2006-207218 A JP 2006-316488 A

  However, in the invention described in Patent Document 2, since the notch portion is formed before the sealing material is stretched around the seal groove, the notch portion must be arranged at the corner portion of the segment. In addition, there is a problem that accuracy is required in the molding process of the sealing material and man-hours are required for the sealing material pasting process. Further, in the invention described in Patent Document 3, it is necessary to provide a metal member for increasing the strength of the seal groove in the segment, the segment structure becomes complicated, the number of parts increases, and man-hours are required for the segment forming process. There is a problem.

  The present invention was devised in view of the above-described problems, and it is possible to prevent the occurrence of cracks, collapses, and the like of a concrete structure by suppressing an excess of sealing material at corners of the concrete structure with a simple structure. An object of the present invention is to provide a seal structure and a concrete structure that can be used.

According to the present invention, in a seal part structure having a seal groove formed on a side surface of a concrete structure provided with a corner part, and a seal material disposed in the seal groove, the seal groove in the corner part includes: A clearance space that absorbs an excess of the sealing material is formed, and the clearance space is formed by providing a chamfered portion or a concave portion on a side surface of the seal groove, and only on a side far from the surface of the concrete structure. A chamfered portion or the concave portion is formed, or the chamfered portion or the concave portion on the side far from the surface of the concrete structure is formed larger than the chamfered portion or the concave portion on the side close to the surface of the concrete structure. A seal portion structure is provided.

Further, according to the present invention, there is provided a concrete structure having a corner portion, the seal portion structure including a seal groove formed on a side surface of the concrete structure and a seal material disposed in the seal groove. A clearance space that absorbs surplus of the sealing material is formed in the seal groove at the corner portion, and the clearance space is formed by providing a chamfered portion or a recess on a side surface of the seal groove, The chamfered portion or the concave portion is formed only on the side far from the surface of the concrete structure, or the chamfered portion or the concave portion on the side far from the surface of the concrete structure is closer to the surface of the concrete structure. A concrete structure is provided that is larger than the chamfered portion or the recessed portion .

In the seal part structure and the concrete structure described above, the clearance space may be formed by providing a chamfered part or a recessed part on the bottom surface of the seal groove. As the sealing material, for example, a water-expandable sealing material is used.

  According to the seal part structure and the concrete structure of the present invention described above, the relief space for absorbing the surplus amount of the seal material is formed in the corner part of the concrete structure. It is possible to reduce the pressing force to the concrete structure caused by the surplus of the sealing material, and to prevent the occurrence of cracks or crushing of the concrete structure. Further, the processing of the sealing material and the reinforcing member are unnecessary, and the occurrence of cracks and crushing of the concrete structure can be prevented with a simple structure.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a figure which shows the concrete structure based on this invention, (A) is an external view, (B) is sectional drawing of a joint between segments, (C) is sectional drawing of a joint between rings, D) is an enlarged view of a portion D in FIG. In FIG. 1D, the illustration of the sealing material is omitted.

  The concrete structure shown in FIG. 1 (A) is a segment 1 having a shape obtained by dividing an annular tube forming a shield tunnel into a plurality of portions in the circumferential direction. The illustrated segment 1 is, for example, an RC segment made of reinforced concrete, in which reinforcing bars are arranged and covered with concrete. As shown in the figure, the segment 1 has a curved rectangular shape. The end face in the longitudinal direction constitutes an inter-segment joint 1a for assembling the segment 1 in a ring shape, and the end face in the short direction is assembled in a ring shape. An inter-ring joint 1b that connects the segments 1 to each other is formed. A seal material 2 (a main seal material 2a and an auxiliary seal material 2b) is stretched around the inter-segment joint 1a and the inter-ring joint 1b constituting the outer periphery of the segment 1. Further, the boundary portion between the inter-segment joint 1 a and the inter-ring joint 1 b forms a corner 1 c of the segment 1. The segment 1 shown has four corners 1c. The inter-segment joint 1a and the inter-ring joint 1b are provided with fastening mechanisms such as bolts and nuts for connecting the segments 1 to each other, but the illustration is omitted here.

  As shown in FIGS. 1B and 1C, the inter-segment joint 1a and the inter-ring joint 1b are formed with substantially concave seal grooves 3 (a main seal groove 3a and an auxiliary seal groove 3b). . Here, the seal groove of the main seal material 2a is referred to as a main seal groove 3a, and the seal groove of the auxiliary seal material 2b is referred to as an auxiliary seal groove 3b. Each sealing material 2 is disposed with a certain gap from the side surface of each sealing groove 3 and is connected to the bottom surface of each sealing groove 3 by an adhesive or the like. Moreover, the sealing material 2 is arrange | positioned so that it may protrude outward from the end surface of the joint 1a between segments, and the joint 1b between rings. When the inter-segment joint 1a and the inter-ring joint 1b of the segments 1 are connected so as to come into contact with each other, the elastic deformation of the sealing material 2 is received in the gap of the seal groove 3. The seal material 2 is, for example, a water-expandable seal material 2 that absorbs surrounding moisture after the segments 1 are joined and expands in the seal groove 3 to water-tightly seal the joints of each segment 1. The main seal groove 3a of the inter-segment joint 1a is formed in a concave shape, and the main seal groove 3a of the inter-ring joint 1b is formed in a concave shape in a step portion constituting a part of the concave shape. These are merely examples, and are not limited to these shapes and combinations.

  Next, the seal part structure at the corner 1c of the segment 1 will be described. 1D is an enlarged view of a portion D including a main seal material 2a and a main seal groove 3a in the corner portion 1c. However, for convenience of explanation, hereinafter, the seal material 2 and the seal groove 3 will be simply described. I will call it. As illustrated, the seal portion structure of the present invention is disposed in the seal groove 3 formed on the side surface (inter-segment joint 1a and inter-ring joint 1b) of the segment 1 having the corner portion 1c, and the seal groove 3. And a clearance space 4 that absorbs surplus of the sealing material 2 is formed in the sealing groove 3 at the corner 1c.

  As shown in FIG. 1D, the seal groove 3 includes a bottom surface 3x and a pair of side surfaces 3y and 3y. The escape space 4 includes a chamfered portion 4a configured to be chamfered on the bottom surface 3x of the corner portion 1c, and end surface portions 4b and 4b surrounded by the side surfaces 3y and 3y and the chamfered portion 4a. Has been. That is, the illustrated relief space 4 has a triangular prism shape. By forming the chamfered portion 4a, it is possible to add a margin capable of absorbing the surplus portion of the sealing material 2 to the corner portion 1c of the segment 1 where excess of the sealing material 2 is likely to occur. The chamfered portion 4a is preferably formed by molding when the segment 1 is manufactured, but may be formed by machining after the segment 1 is manufactured. The size of the chamfered portion 4a is appropriately designed based on conditions such as the size and use of the segment 1, the type of the sealing material 2, the shape of the sealing groove 3, and the like.

  2A and 2B are diagrams showing a method of arranging the sealing material at the corners of the segment, in which FIG. 2A shows a first arrangement method, and FIG. 2B shows a second arrangement method. As shown in FIG. 2A, the first arrangement method of the sealing material 2 is such that the sealing material 2 is bonded to the sealing groove 3 and the chamfered portion 4a. Therefore, the escape space 4 is formed outside the sealing material 2 as indicated by a one-dot chain line. Further, as shown in FIG. 2B, the second arrangement method of the sealing material 2 is such that the sealing material 2 is bonded to the chamfered portion 4a so that the sealing material 2 is not bonded. . Therefore, the escape space 4 is formed in a portion surrounded by the chamfered portion 4 a and the sealing material 2. In any case, since a part of the seal groove 3 in the corner 1c of the segment 1 is scraped off by the chamfered portion 4a, the space of the corner 1c of the segment 1 is expanded by the clearance space 4, and the sealing material 2 surpluses can be absorbed.

  Next, the operation of the seal part structure according to the present invention will be described. Here, FIG. 3 is a diagram showing the joint portion of the segment, (A) shows when the segment is arranged, (B) shows when the segment is fastened, and (C) shows when the seal material is expanded. Here, the sealing material 2 bonded by the first arrangement method shown in FIG. 2A is used.

  As shown in FIG. 3 (A), for example, the joint portion of the segment 1 is joined in a ring shape from the segment 1 already joined in a ring shape and the inter-ring joint 1b of the segments 1 and 1 to be joined in the future. The segment 1 and the inter-segment joint 1a are T-shaped joints. Since the sealing material 2 is disposed so as to protrude from the segment 1, when the segment 1 is joined, the sealing material 2 is first brought into contact with each other as shown in FIG.

  Subsequently, when the inter-segment joint 1a and the inter-ring joint 1b of each segment 1 are tightened by a fastening mechanism (not shown), the segments 1 are in contact with each other as shown in FIG. The sealing material 2 is elastically deformed by tightening of the fastening mechanism and is pressed against the seal groove 3. At this time, in the present invention, the relief space 4 is formed in the corner portion 1c. Therefore, in the state of FIG. 3B, the corner portion 1c can have a margin ΔV by the capacity of the relief space 4, and the sealing material. Excessive excess can be suppressed. The margin ΔV varies depending on conditions such as the shape of the segment 1 and the fastening method and the type and shape of the sealing material 2, but for example, the margin ΔV is displayed at the joint as shown in FIG. May be issued.

  After that, the sealing material 2 absorbs surrounding moisture and expands to stop the joint portion of the segment 1 in a watertight manner. At this time, the presence of a margin ΔV due to the escape space 4 can reduce the pressing force with which the sealing material 2 presses the segment 1, and can prevent the segment 1 from cracking or collapsing. Here, the case where the sealing material 2 is formed of a material having water expandability such as butyl rubber has been described. However, in the present invention, it is not always necessary to use the water expandable sealing material 2. Even in the case of the sealing material 2 that does not have water expandability, the sealing material 2 may be excessive due to the joining method or the like, and the sealing material 2 may be excessive. By forming 4, the pressing force with which the sealing material 2 presses the segment 1 can be reduced, and the crack and collapse of the segment 1 can be prevented.

  Next, another embodiment of the seal portion structure according to the present invention will be described. Here, FIG. 4 is a figure which shows other embodiment of the seal part structure which concerns on this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment. Form, (D) shows a fifth embodiment. In addition, the same code | symbol is attached | subjected about the same component as embodiment shown in FIG.1 (D), and the overlapping description is abbreviate | omitted. For convenience of explanation, the illustration of the sealing material 2 is omitted in each figure.

  In the second embodiment shown in FIG. 4A, in addition to the chamfered portion 4a on the bottom surface 3x of the seal groove 3, second chamfered portions 41 and 41 are formed on the side surfaces 3y and 3y on both sides of the bottom surface 3x. Is. In this way, the relief space 4 can be expanded by chamfering the side surfaces 3y and 3y of the corner portion 1c.

  In the third embodiment shown in FIG. 4B, the second chamfered portions 41, 41 are formed on the side surfaces 3y, 3y on both sides of the bottom surface 3x without chamfering the bottom surface 3x of the seal groove 3. Thus, the relief space 4 can also be formed by chamfering only the side surfaces 3y, 3y of the corner 1c.

  In the fourth embodiment shown in FIG. 4C, a second chamfered portion 41 is formed on one side surface 3y of the bottom surface 3x in addition to the chamfered portion 4a of the bottom surface 3x of the seal groove 3. In this way, the relief space 4 can be expanded by chamfering the side surface 3y on one side of the corner 1c. Here, the second chamfered portion 41 is formed on the side surface 3 y far from the surface of the segment 1. Therefore, the escape space 4 can be formed while maintaining the strength on the side close to the surface of the segment 1. If the strength on the side close to the surface of the segment 1 is sufficiently high, the second chamfered portion 41 may be formed only on the side surface 3y on the side close to the surface of the segment 1.

  The fifth embodiment shown in FIG. 4D is the same as the second embodiment shown in FIG. 4A except that the chamfered portion 4a and the second chamfered portion 41 on the side far from the surface of the segment 1 are It is formed larger than the chamfered portion 4a and the second chamfered portion 41 on the side closer to the surface. In this way, by forming the escape space 4 so as to be inclined from the side closer to the surface of the segment 1 to the side farther from the surface, the escape space 4 can be formed while maintaining the strength on the side closer to the surface of the segment 1. Although not shown, only the chamfered portion 4a may be inclined without forming the second chamfered portions 41, 41, or only the second chamfered portions 41, 41 may be formed without forming the chamfered portion 4a. May be inclined.

  Next, still another embodiment of the seal portion structure according to the present invention will be described. Here, FIG. 5 is a figure which shows other embodiment of the seal | sticker part structure which concerns on this invention, (A) is 6th embodiment, (B) is 7th embodiment, (C) is 8th embodiment. Form, (D) shows the ninth embodiment. In addition, the same code | symbol is attached | subjected about the same component as embodiment shown in FIG.1 (D), and the overlapping description is abbreviate | omitted. For convenience of explanation, the illustration of the sealing material 2 is omitted in each figure.

  In the sixth embodiment shown in FIG. 5A, recesses 51, 51 are formed on the bottom surface 3x of the seal groove 3 in the corner 1c of the segment 1. With this configuration, the escape space 4 can be formed in the corner 1c of the segment 1. Moreover, you may form so that the two recessed parts 51 and 51 may be connected. Further, the chamfered portion 4a or the second chamfered portion 41 may be formed, and the concave portions 51 may be formed on the bottom surfaces 3x on both sides thereof.

  In the seventh embodiment shown in FIG. 5B, a recess 52 is formed on the side surface 3 y of the seal groove 3 in the corner 1 c of the segment 1. With this configuration, the escape space 4 can be formed in the corner 1c of the segment 1. Here, a recess 52 is formed on the side surface 3y far from the surface 1d of the segment 1. Therefore, the escape space 4 can be formed while maintaining the strength on the side close to the surface 1d of the segment 1. Moreover, you may form so that the two recessed parts 52 and 52 may be connected. Further, the chamfered portion 4a or the second chamfered portion 41 may be formed, and the concave portions 52 may be formed on the side surfaces 3y on both sides thereof. When the strength on the side close to the surface 1d of the segment 1 is sufficiently high, the recess 52 may be formed only on the side surface 3y on the side close to the surface 1d of the segment 1, or the side surfaces on both sides of the bottom surface 3x. You may make it form the recessed part 52 in 3y and 3y.

  In the eighth embodiment shown in FIG. 5C, a recess 53 is formed in the chamfered portion 4a of the embodiment shown in FIG. Thus, the relief space 4 can be expanded by forming the recessed part 53 in the chamfered part 4a. Moreover, although not shown in figure, you may make it form the recessed part 53 in the chamfering part 4a or the 2nd chamfering part 41 of 2nd-5th embodiment shown to FIG. 4 (A)-(D). Moreover, you may make it form the some recessed part 53 in the chamfering part 4a.

  In the ninth embodiment shown in FIG. 5D, the side surface 3y, 3y of the seal groove 3 in the corner 1c of the segment 1 is partially cut out to form a recess 54. With this configuration, the escape space 4 can be formed in the corner 1c of the segment 1. Further, the chamfered portion 4a or the second chamfered portion 41 may be formed after the concave portion 54 is formed.

  As described above, the segment 1 has been described as an example of the concrete structure. However, the present invention is not limited to this, and can be applied to a concrete structure such as a box culvert or a floor slab. The box culvert is a substantially rectangular cylindrical concrete structure used for urban sewers, agricultural drains, underground sidewalks, road crossing culverts, and the like.

  The present invention is not limited to the above-described embodiment, and the embodiments described above may be combined as appropriate, the above-described embodiment may be applied to the auxiliary seal groove 3b of the auxiliary seal material 2b, etc. Various modifications can be made without departing from the spirit of the invention.

It is a figure which shows the concrete structure which concerns on this invention, (A) is an external view, (B) is sectional drawing of a joint between segments, (C) is sectional drawing of a joint between rings, (D) is FIG. FIG. It is a figure which shows the arrangement | positioning method of the sealing material in the corner | angular part of a segment, (A) has shown the 1st arrangement method, (B) has shown the 2nd arrangement method. It is a figure which shows the junction part of a segment, (A) is at the time of segment arrangement | positioning, (B) is at the time of segment fastening, (C) has shown the time of sealing material expansion | swelling. It is a figure which shows other embodiment of the seal part structure which concerns on this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment, (D) is 1st embodiment. 5 shows an embodiment. It is a figure which shows other embodiment of the seal | sticker part structure which concerns on this invention, (A) is 6th embodiment, (B) is 7th embodiment, (C) is 8th embodiment, (D) is 8th embodiment. 9 shows an embodiment.

Explanation of symbols

1 segment 1a joint between segments 1b joint between rings 1c corner 1d surface 2 seal material 2a main seal material 2b auxiliary seal material 3 seal groove 3a main seal groove 3b auxiliary seal groove 3x bottom surface 3y side surface 4 relief space 4a chamfer 41 Double chamfer 51, 52, 53, 54 Recess

Claims (4)

In a seal part structure having a seal groove formed on a side surface of a concrete structure provided with corners, and a seal material arranged in the seal groove,
In the seal groove in the corner portion, forming a relief space to absorb the surplus of the sealing material ,
The escape space is formed by providing a chamfered portion or a recessed portion on a side surface of the seal groove,
The chamfered portion or the concave portion is formed only on the side far from the surface of the concrete structure, or the chamfered portion or the concave portion on the side far from the surface of the concrete structure is closer to the surface of the concrete structure. Forming larger than the chamfered portion or the recessed portion,
A seal structure characterized by that. The seal portion structure according to claim 1, wherein the escape space is formed by providing a chamfered portion or a concave portion on a bottom surface of the seal groove.   The seal part structure according to claim 1, wherein the seal material is a water-expandable seal material. A concrete structure provided with corners, comprising: a seal groove having a seal groove formed on a side surface of the concrete structure; and a seal member disposed in the seal groove, A concrete structure characterized by having the seal part structure according to any one of claims 1 to 3 .