JP2007327196A - Sealing member for segment, sealing structure of segment joint part using it, and segment joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain loss of a water sealing function due to a fire while water sealing performance is highly secured. <P>SOLUTION: A sealing member 2 for a segment interposed between joint end faces 1A, 1A' of segments 1, 1' for constructing a civil engineering structure is constructed by stacking a water sealing layer 3 made of water impermeable water swelling property material and a fire resisting layer 4 made of thermal expansion material in the segment joining direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seal member for a segment interposed between joint end surfaces of segments for constructing a civil engineering structure such as a tunnel or a sewer pipe, a seal structure of a segment joint using the segment, and a segment joining method, in particular. It relates to a technology that suppresses the loss of the water stop function (seal function) due to fire.

  Conventionally, this type of segment seal member includes a water-stopping layer made of a non-water-permeable water-swellable material and a fire-resistant layer made of a heat-expandable material, with the fire-proof layer positioned on the inside of the segment. By laminating in the direction perpendicular to the segment joining direction, the fire inside the segment has a fire-resistant layer to suppress the flame to the water-stopping layer and contact with high-temperature air caused by the flame. There is known a technique that prevents water layer loss and maintains a water stop function even after a fire. (For example, see Patent Document 1 below)

JP 2006-52536 A

  However, in the conventional segment sealing member as described above, although the loss of the water stop function due to fire can be suppressed, the water stop layer is formed in the inside and outside of the segment, which is the liquid intrusion direction (that is, the water flow direction) of liquid such as groundwater. Since it is divided into fireproof layers, the length of the waterstop layer in the segment's inside / outside direction must be shortened by the amount of the fireproof layer, so that the effective waterstop distance for the intruding liquid from the inside / outside direction of the segment is reduced. There is a problem that the water stop performance such as the water stop function maintaining period and the allowable water stop pressure cannot be sufficiently obtained.

  In view of this situation, the main problem of the present invention is to provide a segment seal member capable of suppressing loss of the water stop function due to fire while ensuring high water stop performance, and a seal structure of a segment joint using the same, and It is in providing a segment joining method.

A first characteristic configuration of the present invention relates to a segment seal member,
A segment sealing member interposed between joint end surfaces of segments for constructing a civil engineering structure,
The water-stopping layer made of a non-water-permeable water-swellable material and the fireproof layer made of a non-water-permeable heat-expandable material are laminated in the segment joining direction.

  According to the above characteristic configuration, the water-stopping layer made of a non-water-permeable water-swellable material and the fire-resistant layer made of a non-water-permeable heat-expandable material are joined in the segment joining direction (in other words, the direction perpendicular to the segment inner and outer directions) Since the water-stopping layer is arranged over the entire length in the segment inside / outside, which is the direction of water flow between the joining end surfaces of the segments, the intruding liquid, intruding flame, or intruding hot air from the inside / outside direction of the segment The end face of the seal member in the inner and outer direction of the segment opposite to the end face is constituted by a laminated end face composed of a water stop layer end face and a fireproof layer end face.

  In other words, while the maximum effective water stop distance by the water stop layer in the direction of the inside and outside of the segment, which is the direction of water flow, can be ensured to the maximum, liquid can intrude from the inside and outside of the segment between the joint end surfaces of the segments. When the intruding liquid comes into contact with the end face of the seal member in the direction, the intruding liquid can be absorbed from the end face of the water stop layer on the end face of the seal member to swell the water stop layer. The non-water-permeable fire-resistant layer improves the sealing performance between the joint end faces of the segments, ensuring a water-stopping function, and flame and high-temperature air intrude between the joint end faces of the segments. When an intruding flame or intruding high-temperature air comes into contact with the end face of the seal member inside or outside the segment, the flame or high temperature is Securely closing the penetration portion of the air can be suppressed defects of waterproofing layer of a fire effectively.

  Therefore, the loss of the water stop function due to a fire can be effectively suppressed while the water stop performance can be ensured higher than the above-described conventional technology.

  In the implementation of the first characteristic configuration, it is preferable that the water swelling material constituting the water-stopping layer has a defect temperature higher than the thermal expansion start temperature of the thermal expansion material constituting the refractory layer.

The second feature configuration of the present invention specifies an embodiment suitable for the implementation of the first feature configuration.
The water-stopping layer is a contact layer that comes into contact with the joining end face of the segment in the segment joining direction.

  According to the above characteristic configuration, at least a part of the intruding liquid between the segment joining end faces intrudes along the joining end face of the segment due to the viscosity of the intruding liquid itself, whereas the water blocking layer is arranged with respect to the joining end face of the segment. Because it is a contact layer that contacts in the segment joining direction, the intruding liquid and the water-stopping layer can be reliably brought into contact with each other so that the water-stopping layer can be surely swollen. The sealing performance at the time can be further improved, and the water stop function between the joining end surfaces of the segments can be more reliably exhibited.

The third feature configuration of the present invention specifies an embodiment suitable for the implementation of the first or second feature configuration.
At the time of joining the segments, the water-stopping layer is arranged so that the water-stopping layer is located at an intermediate portion between the joining end faces of the segments.

  According to the above-described characteristic configuration, the intrusion liquid between the segment joining end faces easily falls into the middle part between the segment joining end faces due to gravity, whereas the segments are located at the middle part when joining the segments. Since the water-stopping layer is arranged, the intruding liquid and the water-stopping layer can be efficiently brought into contact with each other to effectively swell the water-stopping layer, so that liquid can penetrate between the joint end surfaces of the segments. The sealing performance at the time can be further effectively improved, and the water stop function between the joining end surfaces of the segments can be effectively exhibited.

A fourth characteristic configuration of the present invention relates to a seal structure of a segment joint portion,
The segment seal member according to any one of claims 1 to 3 is inserted into a seal hole formed between the joining end surfaces of the segments.

  According to the above-described characteristic configuration, it is possible to construct a segment joint portion that has high water-stopping performance and is unlikely to lose its water-stopping function even in the event of a fire.

The fifth feature configuration of the present invention specifies an embodiment suitable for the implementation of the fourth feature configuration.
The seal member thermal expansion space is formed between the inner surface of the seal hole and the end surface in the segment inner / outer direction of the segment seal member inserted therein.

  According to the above-described characteristic configuration, in the space for the thermal expansion of the seal member between the inner surface of the seal hole and the end surface in the segment inner / outer direction of the segment seal member inserted therein against a fire inside or outside the segment Since the above-mentioned refractory layer can be thermally expanded, the end surface in the segment inner and outer direction of the seal member for the segment can be covered by the thermally expanded portion, so that the flame and hot air to the end surface of the water blocking layer can be effectively blocked. Thus, loss of the water stop function due to fire can be more effectively suppressed.

A sixth characteristic configuration of the present invention relates to a segment joining method,
After arranging the segment sealing member according to any one of claims 1 to 3 on each of the joining end surfaces of the adjacent segments, joining the segments in a state where the segment sealing members are opposed to each other. It is in the point characterized by.

  According to the above characteristic configuration, since the segment seal member can be attached to the segment prior to the segment joining step, for example, in the segment joining step, immediately before joining the segments or between the segments. Compared to the case where the segment sealing member is interposed between the joining end faces at the same time as joining, the segment joining process can be simplified and the segment joining work can be facilitated.

  1 to 3 show a segment seal member 2 according to the present invention. The segment seal member 2 is made of concrete for constructing a tunnel T as an example of a civil engineering structure as shown in FIG. The segments 1, 1 'are used between the joint end faces 1A, 1A'.

  As shown in FIGS. 2 to 4, the segment 1 has four surfaces excluding the segment inner side surface 1 </ b> B and the segment outer side surface 1 </ b> C as the segment joint end surface 1 </ b> A for the adjacent segment 1 ′. The inner seal groove 1a having a trapezoidal cross-sectional shape and the outer seal groove 1b having a slightly larger cross-sectional view trapezoidal shape are formed along the longitudinal direction of the segment joining end face 1A in a state of being displaced in the tunnel radial direction. .

  When the segments 1 and 1 'are joined together, an inner seal hole 1D having a vertically long hexagonal shape in cross-section in which the inner seal grooves 1a and 1a are combined between the joining end faces 1A and 1A', and an outer seal groove 1b, An outer seal hole 1E having a vertically long hexagonal shape in cross-section in which 1b is combined is formed.

  As shown in FIGS. 1 to 3, the segment seal member 2 has a shape corresponding to each of the seal grooves 1a and 1b, and has two types of configurations, that is, an inner seal groove seal member 2A and an outer seal groove seal member 2B. In this example, each of the inner seal groove seal member 2A and the outer seal groove seal member 2B is slightly larger than the depth (Da, Db) of the corresponding seal groove (1a, 1b). A vertical rectangular cross section having widths W and W ′, heights H and H ′ that are the same as the bottom width of the seal grooves (1a and 1b), and a length L that is the same as the groove length of the seal grooves (1a and 1b). It is formed in a band shape.

  The segment sealing member 2 has a water stop layer 3 and a refractory layer 4 in the segment joining direction (in the case of joining in the tunnel axis direction, the tunnel axis direction, in the case of joining in the tunnel circumference direction). The laminated structure is a basic configuration. In this example, the outer sealing groove sealing member 2B is arranged from the side of the segment joining end face 1A to be disposed to the 'segment side water blocking layer 3a (water blocking layer 3) -fireproof layer 4'. -The seal member side water stop layer 3b (water stop layer 3) 'is arranged in the order of three layers, and the inner seal groove seal member 2A is moved from the side of the segment joining end surface 1A to be disposed to the' segment side water stop layer. It has a two-layer structure in which the layer 3a (water-stopping layer 3) and the refractory layer 4 ′ are arranged in this order.

  The water-stopping layer 3 of each of the sealing members 2A and 2B is stratified by a water-swellable rubber (an example of a water-swellable material) that swells by absorbing a liquid. A synthetic rubber such as EPDM as a main material is mixed with a water swelling material such as sodium polyacrylate.

  Further, the fire-resistant layer 4 of each of the sealing members 2A and 2B is formed of a heat-expandable rubber (an example of a heat-expandable material) that expands due to a temperature rise at the time of a fire. A material obtained by mixing a thermal expansion material such as expanded graphite with synthetic rubber such as EPDM as a main material is employed.

  Then, the water-swellable rubber constituting the water-stopping layer 3 and the heat-expandable rubber constituting the fireproof layer 4 are coextruded, or the water-expandable rubber and the heat-expandable rubber are bonded together. The sealing members 2A and 2B are configured by the method described above.

  The segment side water stop layer 3a of each of the sealing members 2A and 2B constitutes a contact layer that comes into contact with the segment joining end face 1A in the segment joining direction. Further, the sealing member-side water blocking layer 3b of the inner sealing groove sealing member 2A constitutes a contact layer for the inner sealing groove sealing member 2A on the segment 1 'side to be joined to the segment 1 to be disposed. When the inner sealing groove sealing member 2A is disposed between the joining end faces 1A, 1A 'of the matching segments 1, 1' and the segments 1, 1 'are joined together, the intermediate part between the joining end faces 1A, 1A' The water-stopping layer 3 is arranged on the surface.

  Next, a segment joining method using the segment seal member 2 according to the present invention will be described.

  First, each of the segment seal members 2 and 2 (specifically, for the inner seal groove) with respect to the bottom surfaces of the inner seal groove 1a and the outer seal groove 1b on the joining end faces 1A and 1A 'of the pair of segments 1 and 1', respectively. Each of the sealing members 2A and 2A and the outer sealing groove sealing members 2B and 2B) is attached by a sticking means (not shown) such as a double-sided tape or an adhesive.

  Next, with the segment seal members 2 and 2 facing each other, the joining end faces 1A and 1A 'of the segments 1 and 1' are brought close to each other along the segment joining direction, and the segment seal members 2 and 2 are brought into contact with each other. Make contact.

  Thereafter, when the segment seal members 2 and 2 are compressed, the segments 1 and 1 'are joined together by a joining means (not shown) such as a bolt or nut, or a joining method such as fitting, as shown in FIG. As described above, the segment seal members 2 and 2 are positioned at intermediate positions in the segment inner and outer directions in the seal holes 1D and 1E (upper and lower intermediate positions in FIG. 3). On both sides (that is, between the inner surfaces of the seal holes 1D and 1E and the seal member end surfaces 2c and 2c in the segment inner and outer directions of the segment seal members 2 and 2), there is a seal member expansion space S having a triangular shape in cross section. It is formed.

The state at the time of the liquid intrusion and the flame (or high temperature air) intrusion of the segment joint portion configured as described above will be described.
[I] When liquid enters (see Fig. 3)
When a liquid such as groundwater enters between the segment end faces 1A and 1A 'between the segments 1, 1' from inside and outside the segment, and the intruding liquid contacts the seal member end faces 2c, 2c in the segment inside / outside direction, the seal member end faces 2c, 2c The water-stopping layer 3 is swollen by absorbing the intruding liquid from the end face of the water-stopping layer, whereby the non-water-permeable water-stopping layer 3 and the refractory layer 4 are joined to the end faces 1A, 1A of the segments 1, 1 '. Improves the sealing performance between ′.

  More specifically, for example, when liquid such as ground water enters from the segment outer surfaces 1C and 1C 'between the joining end surfaces 1A and 1A' of the segments 1 and 1 ', the intruding liquid enters the inlet of the outer seal hole 1D. The portion (the upper end portion of the outer seal hole 1D in FIG. 3) is divided into a liquid along the joining end surfaces 1A and 1A '(specifically, the inner surface of the sealing hole 1D) and a liquid falling by gravity due to viscosity, and the joining end surface 1A The liquid along 1A ′ is absorbed in contact with the segment-side water blocking layers 3a and 3a of the seal member end faces 2c and 2c in the inner and outer directions of the segment, and the liquid that falls by gravity is water-stopped on the seal member end faces 2c and 2c. The layers 3b and 3b are absorbed in contact with each other, whereby each of the water blocking layers 3a, 3a, 3b and 3b swells with water, and the liquid intrusion into the segment inner surfaces 1B and 1B ′ is prevented from occurring in the outer seal hole 1D. It can be effectively suppressed by the minute.

[B] Flame intrusion (fire) (see Figure 3)
When high temperature air due to a flame or flame enters between the joining end faces 1A and 1A 'of the segments 1 and 1' from inside and outside the segment, the sealing member end faces in the segment inside and outside in the segment sealing members 2 and 2 through the sealing member expansion space S An intruding flame or intruding hot air contacts 2c and 2c. When the refractory layers 4 and 4 reach the thermal expansion temperature due to the flame contact or high temperature air contact, the refractory layers 4 and 4 thermally expand to close the seal member expansion space S, and the segment seal members 2 and 2 Defects in the water blocking layers 3 and 3 are suppressed.

  In short, the segment sealing member 2 of the present invention is formed by laminating the water-stopping layer 3 made of a water-impermeable water-swellable material and the fireproof layer 4 made of a water-impermeable and water-expandable material in the segment joining direction. Thus, while ensuring the maximum effective water stop distance by the water stop layer 3 in the direction of water flow and ensuring a high water stop performance, the fire resistant layer 4 prevents defects such as the loss of the water stop layer 3 due to the flame. It can be effectively deterred.

[Other Embodiments]
[1] In the above-described embodiment, the tunnel construction segment has been described as an example of the civil engineering structure construction segment 1. However, the present invention is not limited to this, and the segment for construction of sewer pipes and the retaining wall construction is not limited thereto. Or the like.

[2] In the embodiment described above, synthetic rubber such as EPDM is adopted as the main material of the water-swellable rubber that forms the water-stopping layer 3 and the main material of the heat-expandable rubber that forms the refractory layer 4. However, for example, various materials such as olefin-related resins such as polyethylene and asphalt may be used.

[3] In the above-described embodiment, as a structure in which the water-stopping layer 3 and the fireproof layer 4 are laminated in the segment joining direction, a three-layer structure including “waterproof layer 3 -fireproof layer 4 -waterproof layer 3”, and In this example, a two-layer structure composed of 'waterproof layer 3 -fireproof layer 4' is shown as an example. For example, a three-layer structure composed of 'fireproof layer 4 -waterproof layer 3 -fireproof layer 4' is adopted. For example, the stacking order and stacking distribution may be changed as appropriate, and the number of stacks is not limited to two or three but may be four or more.

[4] In the above-described embodiment, each segment seal member 2 is formed in a shape corresponding to each seal groove 1a, 1b formed on the joining end surface 1A of the segment 1, and each segment 1, 1 'is adjacent to each other. As shown in the example of mounting, each segment sealing member 2 is configured in a shape corresponding to each sealing hole 1D, 1E formed between the joining end faces 1A, 1A 'of the adjacent segments 1, 1'. Alternatively, it may be attached to only one of the adjacent segments 1, 1 '.

[5] In the above-described embodiment, the structure in which two seal holes (the inner seal hole 1D and the outer seal hole 1E) are formed between the joining end surfaces 1A and 1A 'of the segments 1, 1' has been shown as an example. A structure in which one seal hole is formed or a structure in which three or more seal holes are formed may be employed.

[6] In the above-described embodiment, the structure in which the segment seal member 2 is disposed in all of the plurality of seal holes formed between the segment joining end faces 1A and 1A ′ is shown as an example. You may make it the structure arrange | positioned.

[7] In the above-described embodiment, the water-swellable rubber constituting the water-stopping layer 3 and the heat-expandable rubber constituting the refractory layer 4 are coextruded, or the water-expandable rubber and the heat-expandable rubber In the example, the sealing members 2A and 2B are formed by a method such as adhering to each other. For example, in the state in which a water-expandable rubber and a heat-expandable rubber are laminated, a restraint such as a bag or a string You may comprise by the method restrained by a means, and can employ | adopt various methods.

[8] In the above-described embodiment, the case where the segment seal member 2 is interposed in the seal hole portion (the inner seal hole 1D and the outer seal hole 1E) between the segment joining end faces 1A and 1A ′ is shown as an example. However, the present invention is not limited to this, and any portion may be interposed between the segment joining end faces 1A and 1A ′.

[9] In the above-described embodiment, a seal groove is formed on both of the segment joint end faces 1A and 1A ′, and when both of the segment joint end faces 1A and 1A ′ are joined, a seal hole is formed by combining both seal grooves. As an example, a seal groove is formed only on one of the segment joint end faces 1A and 1A ', and when the segment joint end faces 1A and 1A' are joined, a seal hole is formed between one seal groove and the other joint end face. You may make it the structure to form.

The perspective view of the sealing member for segments which concerns on this invention A longitudinal sectional view showing a state in which the segment seal member is disposed on the segment joining end face Longitudinal sectional view showing the state when the segments are joined Perspective view showing segments for tunnel construction

Explanation of symbols

1, 1 'segment 1A, 1A' segment joint end face 2 segment seal member 3 water blocking layer 4 fireproof layer

Claims (6)

A segment sealing member interposed between joint end surfaces of segments for constructing a civil engineering structure,
A segment seal member comprising a water-stopping layer made of a non-water-permeable water-swellable material and a fireproof layer made of a non-water-permeable heat-expandable material laminated in the segment joining direction.   The segment sealing member according to claim 1, wherein the water blocking layer is a contact layer that comes into contact with a joining end face of the segment in a segment joining direction.   The segment sealing member according to claim 1 or 2, wherein the water-stopping layer is arranged so that the water-stopping layer is positioned at an intermediate portion between the joining end faces of the segments when the segments are joined.   The seal structure of the segment junction part which has inserted the seal member for segments of any one of Claims 1-3 in the seal hole formed between the joining end surfaces of the said segments.   The seal structure for a segment joint portion according to claim 4, wherein a space for sealing member thermal expansion is formed between an inner surface of the seal hole and an end surface in the segment inner / outer direction of the segment seal member inserted therein. After arranging the segment sealing member according to any one of claims 1 to 3 on each of the joining end surfaces of the adjacent segments, joining the segments in a state where the segment sealing members are opposed to each other. A segment joining method characterized by the above.

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