JP2021134517A - Seal structure of concrete structure - Google Patents

Abstract

To provide a seal structure of a concrete structure that does not reduce a strength of a butt portion of a concrete member and can improve sealability.SOLUTION: A groove 11 extending a longitudinal direction of an end surface of a segment 10 is formed at a portion where an end portion of a thickness direction of the segment 10 is not included, so the groove 11 becomes a closed cross-section, and when a loading in the thickness direction is applied to the segment 10, a contact surface between the end surface can be secured even at a thickness direction end portion of the segment 10. A low compression portion 22 located in the groove 11 is formed at a part of a seal member 20 interposed between the end surfaces of the segment 10 in a compressed state, and a high compression portion 21 compressed at a portion other than the groove 11 is formed at another portion of the seal member 20. Therefore, the high compression portion 21 can prevent a mortar M from entering, and the low compression portion 22 can store the mortar M in the groove 11.SELECTED DRAWING: Figure 5

Description

The present invention relates to, for example, a sealing structure of a concrete structure used for a tunnel lining body, a retaining wall, an underground wall, and the like.

Conventionally, as a concrete structure in which a plurality of plate-shaped concrete members are abutted against each other so that their end faces face each other, for example, a tunnel lining body used for a road or the like is known (for example, a patent document). See 1.). Since the tunnel lining is constructed by joining a plurality of segments as concrete members, it has a sealing structure that seals between the end faces of each segment.

For example, in the conventional seal structure shown in FIG. 16, a groove 1a is provided on the end faces of the segments 1 facing each other, and a seal member 2 for sealing between the end faces of the segment 1 is provided in the groove 1a. After the lining body is constructed by the segment 1, the mortar M is filled in the gap between the outer peripheral side of the segment 1 and the ground Y as shown in FIG. 17, but the end faces of the segment 1 are sealed by the sealing member 2. Therefore, the sealing member 2 prevents the mortar M from entering the inner air side of the segment 1.

Japanese Unexamined Patent Publication No. 3-137398

By the way, in the seal structure, the groove 1a for the seal member 2 is generally provided on the outer peripheral side (ground side) of the segment 1, but in this case, the groove 1a has an open cross section on the outer peripheral surface side of the segment 1. Therefore, the contact portion between the end faces on the outer peripheral side of the segment 1 is reduced by that amount. Therefore, as shown in FIG. 18, when a load F is applied to the outer peripheral side of the segment 1, a rotational force is generated in the segment 1 with the corner portion of the groove 1a on each end surface as the base point P, as compared with the case where the groove 1a is not provided. There is a problem that the strength of the abutting portion of the segment 1 with respect to the load is lowered. In particular, when a segment having a small thickness dimension is used, the base point P of the rotational force is closer to the neutral axis C side, so that the decrease in strength becomes larger. Further, in the seal structure in which only the seal member 2 is arranged in the groove 1a, there is a problem that sufficient airtightness cannot be obtained with respect to the pressure at the time of filling the mortar M.

The present invention has been made in view of the above problems, and an object of the present invention is a concrete structure capable of improving the airtightness without lowering the strength of the abutted portion of the concrete member. The purpose is to provide a sealing structure.

The present invention is used for a concrete structure in which a plurality of plate-shaped concrete members are arranged so as to face each other so that their end faces face each other in order to achieve the above object, and a sealing member is interposed between the end faces of the concrete members. In the sealing structure of the concrete structure, a groove extending in the longitudinal direction of the end face is provided on the end face of the concrete member, and the groove is formed in a portion not including the end portion in the thickness direction of the concrete member to form the sealing member. Is placed in the groove and a part other than the groove and is interposed between the end faces of the concrete member in a compressed state, so that a low compression part or a non-compression part located in the groove is formed in a part of the seal member, and the seal member A high-compression portion that is compressed in a portion other than the groove is formed in another portion.

As a result, the groove is formed in the portion of the concrete member that does not include the end in the thickness direction. Therefore, when the groove has a closed cross section between the concrete members and a load in the thickness direction is applied to the concrete member, the concrete member The contact surface between the end faces is secured even at the end portion in the thickness direction of the concrete member, and the strength of the abutting portion of the concrete member with respect to the external pressure is not lowered as compared with the case where the groove having the open cross section is provided as in the conventional case. Further, a low compression portion located in the groove is formed in a part of the seal member interposed between the concrete members in a compressed state, and a high compression portion to be compressed in a portion other than the groove is formed in the other portion of the seal member. Therefore, the high-compression portion blocks the liquid invaders, and the low-compression portion stores the invaders in the groove.

According to the present invention, the strength against external pressure is not lowered as compared with the case where a groove having an open cross section is provided on the end face of the concrete member as in the conventional case, so that the durability can be improved. In addition, the high compression part of the seal member can prevent liquid intruders, and the low compression part of the seal member can store the invaders in the groove. Therefore, there are two types of spaces between the end faces of the concrete member. The seal portion can be reliably sealed, and the airtightness can be improved.

Sectional sectional view of the main part of the seal structure which shows 1st Embodiment of this invention Enlarged sectional view of the main part of the segment Cross-sectional view of the main part showing the segment joining process Enlarged sectional view of the main part of the seal structure Cross-sectional view of the main part showing the lining of the tunnel Diagram showing the array state of segments Enlarged sectional view of a main part of a segment showing a modified example of the first embodiment Cross-sectional view of a main part showing a segment joining step showing another modification of the first embodiment. Cross-sectional view of a main part of a seal structure showing another modification of the first embodiment Enlarged sectional view of a main part of a seal structure showing a second embodiment of the present invention. Enlarged sectional view of a main part of a seal structure showing a third embodiment of the present invention. Enlarged sectional view of a main part of a segment showing a fourth embodiment of the present invention. Enlarged sectional view of a main part showing a segment joining step showing a fourth embodiment of the present invention. Enlarged sectional view of a main part of a seal structure showing a fourth embodiment of the present invention. Enlarged sectional view of a main part of a segment showing a modified example of the fourth embodiment Cross-sectional view of the main part of the segment joining process showing a conventional example Cross-sectional view of the main part of the tunnel lining body showing a conventional example Cross-sectional view of the main part of the seal structure showing a conventional example

1 to 9 show the first embodiment of the present invention, and show a seal structure used for a tunnel lining body as a concrete structure. In the present embodiment, only the seal portion of the lining body is illustrated, and the illustration of the entire lining body is omitted. In the present embodiment, a plurality of segments 10 as concrete members are butted against each other so that their end faces face each other. A lining body is constructed by arranging them side by side in the tunnel circumferential direction and the tunnel axial direction, and the segments 10 are joined to each other with a seal member 20 interposed between the end faces. Although only a part of the segment 10 is shown, it is formed in a long plate shape in the left-right direction of the drawing.

The segment 10 is made of an arc-shaped block manufactured in advance at a factory, and is made of reinforced concrete, or a steel material and concrete are integrated and covered with a steel plate. The end face of the segment 10 is provided with a groove 11 extending in the longitudinal direction of the end face (the tunnel circumferential direction and the tunnel axial direction), and the groove 11 is formed in a semicircular cross section. Recesses 12 continuous with the groove 11 are provided on both ends in the width direction of the groove 11 (thickness direction of the segment 10), and each recess 12 is formed so as to have a flat bottom surface. The groove 11 and each recess 12 are formed in a portion that does not include the end side in the thickness direction of the segment 10, and are arranged slightly closer to the outer periphery than the center in the thickness direction of the segment 10. In this case, each recess 12 is formed so that its depth dimension A1 is smaller than the depth dimension A2 at the center of the groove 11.

The seal member 20 is formed of a well-known rubber sponge as an elastic member having liquid absorbency (for example, foamed rubber made of open cell sponge), and is formed so as to extend along the longitudinal direction of the segment 10. The seal member 20 is formed to have a quadrangular cross section, and the dimension B1 in the width direction (thickness direction of the segment 10) in the natural state is formed to be smaller than the distance A3 between both ends of each recess 12 and larger than the width dimension A4 of the groove 11. Has been done. Further, the seal member 20 is formed so that the dimension B2 in the thickness direction (longitudinal direction of the segment 10) in the natural state is larger than the depth dimension A2 at the center of the groove 11.

In the above configuration, when joining the segments 10 to each other, as shown in FIG. 3, the seal member 20 is adhered to the end face of one of the segments 10 facing each other so as to extend over the groove 11 and each recess 12. The sealing member 20 is attached to one of the segments 10 by sticking it with an agent or an adhesive tape, and as shown in FIG. 1, the end faces of the segments 10 are abutted against each other and connected by a connecting metal fitting (not shown) or the like. As a result, the seal member 20 interposed between the end faces of the segment 10 is compressed at each end face and elastically deformed along the groove 11 and each recess 12, and the portions other than the groove 11 and each recess 12 on each end face are directly abutted. NS. At that time, the seal member 20 is filled in the space formed by the groove 11 and each recess 12 on each end face in a compressed state, and the depth dimension A1 of each recess 12 is from the depth dimension A2 at the center of the groove 11. Is also extremely small, so that both ends in the width direction of the seal member 20 are highly compressed between the recesses 12, and as shown in FIG. 4, the highly compressed portion 21 of the seal member 20 is formed in each recess 12. On the other hand, the central side of the seal member 20 arranged in the groove 11 in the width direction has lower compression than both ends, and the low compression portion 22 of the seal member 20 is formed in the groove 11.

After the lining body is constructed by each of the segments 10, the mortar M is filled in the gap between the outer peripheral side of the segment 1 and the ground Y as shown in FIG. Since it is hermetically sealed, the sealing member 20 prevents the liquid mortar M from entering the inner air side of the segment 1.

At that time, since the groove 11 in which the seal member 20 is arranged and each recess 12 are formed in a portion not including the end side in the thickness direction of the segment 10, the groove 11 and each recess 12 have a closed cross section, and the segment 10 The end faces on the end side in the thickness direction come into direct contact with each other. As a result, when the lining body receives a load from the ground Y side, the contact surfaces between the end faces are secured also on one end side in the thickness direction of the segment 10 (outer peripheral side of the segment 10), as in the conventional case. The strength against external pressure is not lowered as compared with the case where the groove 1a having an open cross section is provided.

Further, when the mortar M invades between the outer peripheral side and the end face of the segment 10, since the highly compressed portion 21 of the seal member 20 is formed in each recess 12, one of the seal members 20 (upper in the drawing). Intrusion is blocked by the high compression unit 21. Since the sealing member 20 is compressed at a high density, the high compression portion 21 has high airtightness and can sufficiently block the passage of the mortar M. However, when a small amount of mortar M passes through the high compression portion 21 It is housed in the groove 11. Since the low compression portion 22 of the seal member 20 is formed in the groove 11, the mortar M that has entered the groove 11 is stored in the groove 11 by the low compression portion 22. Since the seal member 20 is compressed at a low density, the low compression portion 22 has high liquid absorption, and can absorb the mortar M and store it in the groove 11. Further, since the end faces of the segment 10 are sealed by the high compression portion 21 on the other side (lower part in the drawing) of the seal member 20, the mortar M in the low compression portion 22 does not leak from the groove 11.

Further, when constructing the lining body by each segment 10, as shown in FIG. 6, among a plurality of segments 10 arranged side by side in the tunnel circumferential direction and the tunnel axial direction, sealing members are applied to all end faces of each side. The segment 10 in which the 20 is arranged and the segment 10 in which the seal member 20 is not arranged on any side are alternately arranged in the tunnel circumferential direction and the tunnel axial direction, respectively.

As described above, according to the present embodiment, the groove 11 extending in the longitudinal direction of the end face is provided on the end face of the segment 10, and the groove 11 is formed in the portion not including the end portion in the thickness direction of the segment 10. When the groove 11 has a closed cross section and a load in the thickness direction is applied to the segment 10, a contact surface between the end faces can be secured even at the end portion in the thickness direction of the segment 10. As a result, the strength of the abutted portion of the segment 10 with respect to the external pressure is not lowered as compared with the case where the groove 1a having an open cross section is provided as in the conventional case, and the durability can be improved.

Further, by arranging the seal member 20 in a portion other than the groove 11 and the groove 11 and interposing the seal member 20 between the end faces of the segment 10 in a compressed state, a low compression portion 22 located in the groove 11 is provided in a part of the seal member 20. Since the high compression portion 21 formed and compressed in the portion other than the groove 11 on both sides of the groove 11 is formed in the other portion of the seal member 20, the high compression portion 21 prevents the intrusion of the mortar M. The mortar M can be stored in the groove 11 by the low compression portion 22. As a result, the space between the end faces of the segment 10 can be reliably sealed by the two types of sealing portions, so that the airtightness can be improved.

Further, by making the depth dimension A1 of the recess 12 extremely small (for example, about 1 mm), not only the contact surface between the groove 11 and the portion other than each recess 12 but also the height between the recesses 12 between the end faces of the segment 10 Axial force between the segments 10 (force in the direction perpendicular to the end face of the segment 10) can also be transmitted by the compression portion 21, and the decrease in strength of the joint portion of the segment 10 due to the provision of the recess 12 can be extremely reduced. can.

Further, since the seal member 20 is formed of an elastic member having liquid absorbency, the liquid absorbency of the low compression portion 22 of the seal member 20 can be enhanced, and the mortar M in the groove 11 by the low compression portion 22 can be enhanced. Can enhance the storage effect of.

Further, since the groove 11 is formed in a semicircular cross section, when the seal member 20 is compressed between the end faces of the segment 10, the seal member 20 can be easily inserted into the groove 11, and the low compression portion 22 can be easily formed. Can be formed. In this case, if the chamfered portion 11a is formed between the groove 11 and the portion other than the groove 11 (recessed portion 12) as in the modified example shown in FIG. 7, the sealing member 20 can be more easily inserted into the groove 11. , The low compression portion 22 can be evenly formed in the groove 11.

Further, the segment 10 in which the seal member 20 is arranged on all the end faces of each side and the segment 10 in which the seal member 20 is not arranged on any side are alternately arranged in the tunnel circumferential direction and the tunnel axial direction. Therefore, it is sufficient to mount the seal member 20 in advance only on half of the segments 10 used for the entire lining body, and the sealing member 20 can be efficiently mounted.

In the above embodiment, the segment 10 is provided with the recess 12 on the end surface, but as in the other modified examples shown in FIGS. 8 and 9, the seal member 20 is formed with the groove 11 and the seal member 20 without the recess. The high compression section 21 and the low compression section 22 may be formed by compressing in a portion other than the groove 11.

10 to 15 show other embodiments of the present invention, and the same components as those of the first embodiment are designated by the same reference numerals.

That is, in the first embodiment, the low compression portion 22 is formed in the groove 11, but as in the second embodiment shown in FIG. 10, the seal member 20 is in a natural state. The uncompressed portion 23 of the seal member 20 may be formed in the groove 11 by forming the dimension B2 in the thickness direction to be smaller than the maximum dimension A5 in the depth direction of each groove 11. In this case, since the dimension B2 of the seal member 20 is smaller than the dimension A5 of each groove 11, a gap portion 11b in which the seal member 20 does not exist is formed in the groove 11, so that the mortar M is also stored in the gap portion 11b. It is possible to enhance the storage effect of the mortar M in the groove 11.

Further, as in the third embodiment shown in FIG. 11, a groove 13 having a triangular cross section may be provided instead of the groove 11 having a semicircular cross section. In the present embodiment, when the seal member 20 is compressed between the end faces of the segment 10, the seal member 20 is difficult to enter into the corner of the groove 13 having a triangular cross section. It becomes easy to form the gap portion 13a between the two. As a result, even if the seal member 20 is formed so that the dimension B2 in the thickness direction in the natural state becomes large, the gap portion 13a can be formed in the groove 13, so that the high compression portion 21 having a high compressibility is formed. However, there is an advantage that the gap portion 13a can also be formed.

In the fourth embodiment shown in FIGS. 12 to 14, instead of the semicircular groove 11 in the cross section, a groove 14 having a shape in which the seal member can be engaged is provided, and the seal member 30 having a circular cross section is formed in the groove 14. It is designed to engage with. The groove 14 is formed in a substantially circular cross section in which the width dimension of the opening is smaller than the inner diameter dimension, and as shown in FIG. 13, a part of the sealing member 30 is pushed into the groove 14 of one segment 10 to seal the groove 14. The member 30 engages with the groove 14 and is held by the end face of one segment 10. When the end face of the other segment 10 is abutted against the end face of one segment 10 in this state, another part of the sealing member 30 is press-fitted into the groove 14 of the other segment 10, and as shown in FIG. The high compression portion 31 is formed in the groove 14, and the low compression portion 32 is formed in the groove 14.

As a result, in the present embodiment, the seal member 30 can be held in the segment 10 by pushing a part of the seal member 30 into the groove 14 of the segment 10, so that the seal member 30 can be attached to the segment 10 with an adhesive or an adhesive tape. It is not necessary to attach the seal member 30 using the seal member 30, and the sealing member 30 can be easily attached. In this case, if the chamfered portion 14a is formed between the groove 14 and the portion other than the groove 14 (recessed portion 12) as in the modified example shown in FIG. 16, the seal member 20 can be more easily inserted into the groove 14. be able to.

In the above embodiment, the seal structure for preventing the intrusion of the mortar M filled on the outer peripheral side of the tunnel lining is shown, but the intrusion of not only the mortar M but also water such as spring water is prevented. It is also possible.

Further, in the above embodiment, the groove is formed in a semicircular shape, a triangular cross section, and a substantially circular cross section, but the groove is formed in another shape such as a quadrangular cross section or a trapezoidal cross section. You may.

Further, in the above-described embodiment, the present invention is shown as a tunnel lining body, but other than that, as long as it is constructed by joining a plurality of concrete members such as a retaining wall and an underground wall. The present invention can also be applied to the concrete structure of the above.

10 ... segment, 11 ... groove, 12 ... recess, 13, 14 ... groove, 20 ... seal member, 21 ... high compression part, 22 ... low compression part, 23 ... non-compression part, 30 ... seal member, 31 ... high compression Part, 32 ... Low compression part.

Claims (6)

In a concrete structure in which a plurality of plate-shaped concrete members are arranged so as to face each other so that their end faces face each other, and a sealing member is interposed between the end faces of the concrete members, the sealing structure of the concrete structure
A groove extending in the longitudinal direction of the end face is provided on the end face of the concrete member, and the end face is provided with a groove.
A groove is formed in the part of the concrete member that does not include the end in the thickness direction.
By arranging the sealing member in a groove and a portion other than the groove and interposing it in a compressed state between the end faces of the concrete member, a low compression portion or a non-compression portion located in the groove is formed in a part of the sealing member. A sealing structure for a concrete structure, characterized in that a highly compressed portion that is compressed in a portion other than a groove is formed in another portion of the sealing member. The seal structure of a concrete structure according to claim 1, wherein the seal member is made of an elastic member having liquid absorbency. The seal structure of a concrete structure according to claim 1 or 2, wherein the groove is formed in a semicircular cross section. The seal structure of a concrete structure according to claim 1 or 2, wherein the groove is formed in a triangular cross section. The seal structure of a concrete structure according to claim 1 or 2, wherein the seal member and the groove are formed in a shape that allows them to engage with each other. Among the concrete members arranged side by side in a predetermined direction and other predetermined directions orthogonal to the concrete member, the concrete member in which the seal member is arranged on all the end faces of each side and the seal member on any end face of each side. The seal structure for a concrete structure according to any one of claims 1 to 5, wherein concrete members that are not arranged are alternately arranged in each of the predetermined directions.

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