JP2010209594A - Method for constructing cut-off structure, and cut-off structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a cut-off structure which hardly deteriorates the property of following displacement caused by an aperture etc. <P>SOLUTION: In the method constructing the cut-off structure 10 of an underground structure 1 constituted by continuously installing first and second building frames 2a and 2b, the method is characterized by including: a first building frame construction step of constructing the first building frame 2a; a seal attachment step of fixing a seal member 11 to a seal attachment surface formed on the first building frame 2a; a seal compressing step of compressing the seal member 11 between the seal attachment surface and the joint end surface plate 12 by arranging the joint end surface plate 12 in such a manner as to face the seal attachment surface, and keeping an isolation distance between the joint end surface plate 12 and the first building frame 2a constant so as to maintain the compressed state of the seal member 11; and a second building frame construction step of constructing the second building frame 2b next to the first building frame 2a, and fixing the joint end surface plate 12 to the second building frame 2b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction method of a water stop structure provided in an underground structure and a water stop structure.

  An underground structure constructed by connecting a plurality of enclosures (for example, box culverts, segment rings, propulsion pipes, etc.) and having a water stop plate at the joint between adjacent enclosures. It is known (see Patent Document 1).

JP 2006-90100 A

  This type of water stoppage has followability (flexibility) to openings, etc., but since it is fixed (fixed) to both of the two adjacent housings, the water stoppage in the event of an earthquake, etc. On the other hand, the tensile force resulting from the opening of the two housings and the shearing force resulting from the shear displacement of both housings act simultaneously. If tensile force and shearing force act simultaneously, the tensile stress generated in the waterstop plate increases, so the displacement followability of the waterstop plate is impaired compared to when the tensile force and shearing force act separately. .

  Further, when the water stop plate is arranged in accordance with the corner portion of the housing, it is necessary to bend the water stop plate. However, the displacement followability when the water stop plate is bent is arranged linearly as in Patent Document 1. Compared to the case, it becomes even smaller.

  From such a viewpoint, it is an object of the present invention to provide a water stop structure and a construction method thereof in which displacement followability with respect to an opening or the like is not easily impaired.

  A construction method of a water stop structure according to the present invention that solves such a problem is a method of constructing a water stop structure of an underground structure formed by connecting a first housing and a second housing, A first housing construction step of constructing a single housing, a seal mounting step of fixing a seal member to a seal mounting surface provided on the first housing, a pressing member disposed so as to face the seal mounting surface, and the seal mounting A seal compression step of compressing the seal member between a surface and the pressing member, and maintaining a constant separation distance between the pressing member and the first housing in order to maintain a compressed state of the seal member; A second housing construction step of constructing a second housing next to the first housing and fixing the pressing member to the second housing.

  In the water stop structure constructed according to the above procedure, the sealing member is brought into close contact with the pressing member by its own restoring force, so that the joint portion of both housings is stopped. In this water stop structure, since the sealing member is fixed only to the first casing, the tensile force due to the opening of the first casing and the second casing does not act on the sealing member. In other words, according to the water stop structure constructed according to the present invention, the tensile force resulting from the opening of both housings and the shearing force resulting from the shear displacement of both housings do not act at the same time. Displacement followability is not easily impaired.

  When the second casing has a concrete structure, it is preferable that the pressing member is used as a part of a concrete formwork when the second casing is formed. If it does in this way, it will become possible to abbreviate | omit or simplify the demolding operation | work of the concrete formwork in the end surface of a 2nd housing.

  The water stop structure according to the present invention for solving the above-described problems is a water stop structure provided in an underground structure configured by connecting a first housing and a second housing, and is provided in the first housing. The seal member fixed to the seal mounting surface, the pressing member fixed to the end surface of the second casing opposite to the seal mounting surface, and the interval holding for keeping the separation distance between the seal mounting surface and the pressing member constant. The seal member is disposed in a compressed state between the seal mounting surface and the pressing member, and is in close contact with the pressing member by its own restoring force. .

  According to the water stop structure according to the present invention, the tensile force due to the opening of the first casing and the second casing does not act on the seal member. That is, according to the water-stopping structure of the present invention, the tensile force resulting from the opening of both housings and the shearing force resulting from the shear displacement of both housings do not act simultaneously. Is less likely to be damaged.

  In the present invention, before the relative displacement amount generated between the first housing and the second housing reaches the maximum value of the relative displacement amount capable of maintaining the water stop function by the seal member, the interval is set. It is preferable that the holding means is broken. When the two housings are connected, tensile force and shearing force due to the mesh opening and shear displacement between the two housings will act on both housings, so an earthquake etc. will occur if the breaking strength of the spacing means is excessively increased. There is a risk that both housings will be damaged, but if the gap retaining means is broken at an appropriate stage, then the tensile force due to the openings will not act on both housings. , Damage to both rods is difficult to occur.

  In this invention, it is good to form a recessed part in the end surface of said 1st housing facing said 2nd housing, and to form the said seal attachment surface in the bottom face of said recessed part. If it does in this way, positioning at the time of adhering a seal member to a seal attachment surface becomes easy.

  It is preferable to use a seal member that has a V-shaped cross section or a U-shaped cross section, and is arranged in an open state on the ground side. In this case, since the sealing member comes to be pressed against the pressing member by the groundwater pressure acting on the sealing member, even when the opening amount of both the casings is increased and the restoring force of the sealing member is weakened, It becomes possible to maintain the water stop function.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to obtain the water stop structure in which the displacement followability with respect to an opening etc. is hard to be impaired.

It is a perspective view which shows the structure of the underground structure based on suitable embodiment of this invention. It is sectional drawing which shows the water stop structure which concerns on 1st Embodiment. It is a figure which shows the sealing member of the water stop structure of FIG. 2, Comprising: (a) is a perspective view which shows the attachment condition to a housing, (b) is the sectional drawing. (A)-(d) is a figure which shows the embedding member of the water stop structure of FIG. (A)-(c) is sectional drawing which shows each construction step of the construction method of the water stop structure which concerns on 1st Embodiment. (A) And (b) is sectional drawing which shows each construction step of the construction method of the water stop structure which concerns on 1st Embodiment. (A) And (b) is sectional drawing which shows the effect | action condition at the time of the displacement generation | occurrence | production of the water stop structure which concerns on 1st Embodiment. (A) And (b) is sectional drawing which shows each construction step of the construction method of the water stop structure which concerns on 2nd Embodiment. (A) is sectional drawing which shows the water stop structure which concerns on 2nd Embodiment, (b) is sectional drawing which shows the operation condition at the time of the displacement generation | occurrence | production of the water stop structure concerning 2nd Embodiment.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

  In this embodiment, as shown in FIG. 1, in the underground structure 1 formed by connecting a plurality of box culverts (frames 2), a water-stop structure provided at a joint 3 between the box culverts. 10 will be described.

  The water stop structure 10 ensures the water stop of the joint portion 3 between the first housing 2a provided in advance and the second housing 2b provided downstream.

  As shown in FIG. 2, the water stop structure 10 includes a seal member 11 fixed to a seal mounting surface 21 (see FIG. 3B) provided on the first housing 2 a, and a second housing facing the seal mounting surface 21. A joint end face plate (pressing member) 12 fixed to the end face of 2b, and a spacing member 13 for keeping a separation distance between the seal mounting surface 21 and the joint end face plate 12 constant are provided.

  As shown in FIG. 3A, the seal member 11 is arranged in two stages on the end surface of the first housing 2a. The seal member 11 is arranged in a substantially rectangular frame shape according to the cross-sectional shape of the housing 2. In this embodiment, as shown in FIG. 3B, a seal member 11 having a V-shaped section or a U-shaped section having a base portion 11a and a lip portion 11b is used.

  In the present embodiment, the seal member 11 in which the base 11a and the lip 11b are integrally formed in the factory is used, but for the convenience of construction, the base 11a and the lip 11b are carried as separate members, When combining and installing in the field, you may cut | disconnect and use the sealing member 11 integrally formed in the factory etc. In addition, a resinous material is used as the seal member 11, but the material constituting the seal member 11 is limited as long as the material can follow the displacement of the joint portion 3 between the casings 2. is not.

  The shape and the like of the seal member 11 are appropriately set according to the underground water pressure acting on the underground structure 1.

  As shown in FIG. 3 (b), the seal member 11 is disposed in the recess 20 formed on the end surface of the first housing 2 a, and the base 11 a is provided on the seal mounting surface 21 formed on the bottom surface of the recess 20. Bonded and fixed. In addition, the fixing method of the sealing member 11 is not limited, What is necessary is just to perform suitably.

  As shown in FIG. 2, the seal member 11 is disposed such that the V-shaped or U-shaped opening side is the ground side, and is disposed in a compressed state between the seal mounting surface 21 and the joint end surface plate 12. Has been. Thereby, as for the sealing member 11, the lip | rip part 11b which is a water stop part closely_contact | adheres to the joint end surface plate 12 with own restoring force.

  The joint end surface plate 12 is a concrete plate material fixed to the tip surface (first housing side end surface) of the second housing 2b. The joint end surface plate 12 is formed in the same shape as the cross-sectional shape of the second casing 2b.

In addition, the material which comprises the joint end surface plate 12 is not limited, Steel materials, an aluminum alloy, etc. can be set suitably. In addition, the shape of the joint end face plate 12 can be appropriately set according to the shape of the housing 2 constituting the underground structure 1.
Moreover, you may use as a joint end surface plate 12 what is formed in a predetermined | prescribed shape by combining a some division | segmentation member. In this case, a water stop treatment is applied to the joint portion of each divided member.

  The joint end face plate 12 is attached to a spacing member 13 projecting from the rear end face of the first casing 2a, and the separation distance from the end face (seal mounting face) of the first casing 2a is kept constant. .

  As shown in FIG. 4 (a), the joint end face plate 12 is fixed to the second casing 2b by using an embedded member 12a protruding from the rear surface (the second casing 2b side surface) of the joint end face plate 12 as the second casing. This is done by being embedded in 2b. The embedding member 12 a is formed by fixing a plate member 12 c to which a reinforcing bar 12 b is integrally fixed to the rear end of the spacing member 13.

  The configuration of the embedded member 12a is not limited and can be set as appropriate. For example, as shown in FIG. 4B or FIG. 4C, an anchor bolt may be integrally formed at the rear end of the spacing member 13 as the embedded member 12a. Moreover, as shown in FIG.4 (d), you may form the embedding member 12a by fixing an anchor bolt etc. to the joint end surface plate 12 directly. The embedded member 12a may be formed as necessary, and may be omitted.

  The space | interval holding member 13 is a volt | bolt protrudingly provided by the rear-end surface of the 1st housing 2a. The interval holding member 13 is in a state where the rear end portion is protruded by screwing the front end portion to the insert 14 (see FIG. 5A) provided to open to the rear end surface of the first casing 2a. It arrange | positions at the 1st housing 2a.

  The spacing member 13 is not limited to a bolt, and may be composed of other materials such as a carbon fiber projecting from the rear end surface of the first casing 2a.

The indirect holding member 13 is a bolt that holds the joint end face plate 12 in the protruding portion, and is arranged as a temporary bolt for holding the second casing 2b until the concrete is placed.
The spacing member 13 can maintain the water stop function by the seal member 11 due to the relative displacement generated between the first housing 2a and the second housing 2b (the housing spacing before the seal member 11 is fully extended). It consists of the maximum dimension (length).

The interval holding member 13 maintains the water stop function by the seal member 11 with respect to the relative displacement with respect to the vertical and horizontal shifts (vertical direction in FIG. 7) generated between the first housing 2a and the second housing 2b. Has the strength to break before reaching the maximum relative displacement.
In addition, it has a strength to break when the relative displacement amount with respect to the displacement in the separation direction and the axial direction (left and right direction in FIG. 7) generated between the first housing 2a and the second housing 2b reaches a displacement equal to or greater than the reference tightening allowance. is doing.

Next, the construction method of the water stop structure of this embodiment is demonstrated.
The construction method of the water stop structure includes a first case construction step, a seal attachment step, a seal compression step, and a second case construction step.

  As shown in FIG. 5A, the first housing construction step is a step of constructing the preceding housing 2 (first housing 2a).

With the construction of the first housing 2a, the rear end surface (second housing side end surface) is boxed to form the recess 20 (seal mounting surface 21) corresponding to the mounting location of the seal member 11.
Moreover, the insert 14 for fixing the space | interval holding member 13 is embed | buried under the rear end of the 1st housing 2a so that it may open to the 2nd housing side.

  As shown in FIG. 5B, the seal attachment step is a step of fixing the seal member 11 to the seal attachment surface 21 provided on the rear end surface of the first case 2a in the first case construction step.

  The seal member 11 is attached by adhering the base portion 11a of the seal member 11 to the bottom surface (seal attachment surface 21) of the recess 20 formed on the rear end surface of the first housing 2a. At this time, the seal member 11 is arranged in a state where the lip portion 11b protrudes rearward from the recess 20 and is open to the ground side.

  In the seal compression step, as shown in FIG. 5C, the joint end face plate 12 is disposed so as to face the seal attachment face 21, and the seal member 11 is compressed between the seal attachment face 21 and the joint end face plate 12. It is a process to do.

  First, the tip end portion of the spacing member 13 is screwed into the insert 14 embedded in the first housing construction process. The rear end portion of the spacing member 13 protrudes from the rear end of the first casing. Next, the protruding portion (rear end portion) of the spacing member 13 is inserted into the through hole of the joint end face plate 12, and a fastener such as a nut is screwed into the portion protruding from the through hole.

  The joint end face plate 12 and the base concrete (not shown) placed on the foundation ground of the frame 10 are appropriately attached by known means.

  The separation distance between the joint end face plate 12 and the first casing 2a is kept constant so as to maintain the compressed state of the seal member 11. Thereby, the initial water stop performance of the sealing member 11 is ensured (refer Fig.6 (a)).

  As shown in FIG. 6B, the second housing construction step is a step of constructing the second housing 2b next to the first housing 2a.

  As shown in FIG. 6A, the second casing 2b is constructed by assembling a mold 22 for the second casing 2b behind the first casing 2a and placing concrete. The joint end face plate 12 is used as a mold for the end face on the first housing 2a side.

  A water stop seal 23 is bonded to the rear end surface (the side opposite to the first housing 2a) of the joint end surface plate 12.

  Thereafter, concrete is placed in a state where the tip of the spacing member 13 protruding from the joint end face plate 12 is wound. Thereby, integration with the joint end surface plate 12 and the 2nd housing 2b is made.

  After curing of the concrete, as shown in FIG. 6B, when the mold 22 is removed, the joint structure 3 is completed.

  As described above, according to the water-stopping structure 10 and the construction method of the water-stopping structure of the present embodiment, the seam portion is water-stopped by the seal member 11 being in close contact with the joint end face plate 12 by its own restoring force. Since the seal member 11 is fixed only to the first casing 2a, the tensile force due to the opening between the first casing 2a and the second casing 2b does not act on the seal member 11, and the seal member 11 Displacement followability is not easily impaired.

  In other words, since the seal member 11 having a V-shaped cross section or a U-shaped cross section is disposed so as to open to the natural mountain side, the seal member 11 is pushed and expanded by the application of external pressure (water pressure or earth pressure). Thus, the sealing performance is further improved.

  Further, even when the joint surface (seal surface) between the first housing 2a and the second housing 2b slides due to vibration, shear deformation, or the like, as shown in FIG. The lip portion 11b follows the movement, and the sealing performance is maintained.

  Moreover, as shown in FIG.7 (b), even if it is a case where the 1st housing | casing 2a and the 2nd housing | casing 2b are spaced apart, the water stop property is maintained because the lip | rip part 11b spreads.

  Moreover, since it can be comprised by the comparatively cheap sealing member 11, even if it constructs | assembles in the junction part 3 of each housing | casing 2, it can be comprised at low cost. Moreover, since the structure is simple, it is excellent in workability.

Next, the water stop structure of the second embodiment and the construction method of the water stop structure will be described.
As shown in FIG. 9A, the water stop structure 10 ′ of the second embodiment includes a seal member 11 having a V-shaped or U-shaped cross section and a seal member having an O-shaped cross section (hereinafter simply referred to as “tube”). It is different from the water stop structure 10 of the cited document 1 in that the seal 16 is used together.

The water stop structure 10 ′ is composed of a seal member 11 arranged on the outer side (natural mountain side) and a tube seal 16 arranged on the inner side (inside air side) of the first casing 2 a, and 2 Step seal members 11 and 16 are arranged.
In the present embodiment, the case where the seal member 11 and the tube seal 16 are used together will be described, but the tube seal 16 alone may be used.

  The tube seal 16 is arranged in a substantially rectangular frame shape along the periphery of the end surface of the first housing 2 a according to the cross-sectional shape of the housing 2.

  The shape and the like of the tube seal 16 are set as appropriate by calculating the stress acting on the underground structure 1 according to the natural ground conditions and the like.

  The tube seal 16 is disposed in a recess 20 formed on the end surface of the first housing 2 a, and a part of the outer surface is bonded and fixed to a seal mounting surface 21 formed on the bottom surface of the recess 20. In addition, the fixing method of the tube seal 16 is not limited and may be appropriately performed.

  The tube seal 16 is composed of a resinous tubular member, and is arranged in a compressed state between the seal mounting surface 21 and the joint end surface plate 12 by inflating air or the like inside. Thereby, the tube seal | sticker 16 is closely_contact | adhered to the joint end surface plate 12, and exhibits water stop. The material injected into the tube seal 16 is not limited.

  Since the configuration of the water stop structure 10 ′ according to the other second embodiment is the same as the configuration of the water stop structure 10 of the first embodiment, detailed description thereof is omitted.

Next, the construction method of the water stop structure of this embodiment is demonstrated.
The construction method of the water stop structure includes a first case construction step, a seal attachment step, a seal compression step, and a second case construction step.

  Since the first case construction process is the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  As shown in FIG. 8A, the seal attachment step is a step of fixing the seal member 11 and the tube seal 16 to the seal attachment surface 21 provided on the rear end surface of the first case 2a in the first case construction step. .

  The tube seal 16 is attached by adhering a part of the outer surface of the tube seal 16 to the bottom surface (seal attachment surface 21) of the recess 20 formed on the rear end surface of the first housing 2a. At this time, nothing is injected into the tube seal 16 and it has a plate shape. The tube seal 16 may be bonded in a state where air or the like is injected therein.

  Since the fixing method of the seal member 11 is the same as that shown in the first embodiment, detailed description thereof is omitted.

In the seal compression step, as shown in FIG. 8B, the joint end face plate 12 is disposed so as to face the seal attachment face 21, and the seal member 11 is compressed between the seal attachment face 21 and the joint end face plate 12. It is a process to do.
At this time, the tube seal 16 has a plate shape, and a space is formed between the tube seal 16 and the joint end face plate 12.

  In addition, since matters related to the seal compression step are the same as the contents shown in the first embodiment, detailed description thereof is omitted.

  As shown in FIG. 9A, the second housing construction step is a step of constructing the second housing 2b next to the first housing 2a and fixing the joint end face plate 12 to the second housing 2b.

  In the second casing construction step, as shown in FIG. 8B, a mold 22 for the second casing 2b is assembled behind the first casing 2a, and concrete is placed in the mold 22. At this time, the joint end face plate 12 is used as a mold for the end face on the first housing 2a side.

  After the concrete is cured, as shown in FIG. 9A, the mold 22 is removed, and air or the like is injected into the tube seal 16 to expand the tube seal 16 so that the tube seal 16 is joined. Adhere to the end face plate 12. Thereby, the joint structure 3 is completed.

  As described above, according to the waterstop structure 10 ′ and the waterstop structure construction method of the present embodiment, the joint portion is waterstopped by the seal member 11 and the tube seal 16 being in close contact with the joint end face plate 12 by their own restoring force. Is done. Since the seal member 11 and the tube seal 16 are fixed only to the first casing 2a, the tensile force resulting from the opening of the first casing 2a and the second casing 2b acts on the seal member 11 or the tube seal 16. The displacement followability of the seal member 11 and the tube seal 16 is not easily impaired.

  Further, since the tube seal 16 is disposed between the casings 2 in a state where the internal air (oil, water) or the like is compressed, the first casing 2a and the second casing are caused by vibration, shear deformation, or the like. Even when the joint surface (seal surface) with 2b slides, the tube seal 16 follows the movement and the sealing performance is maintained.

Further, as shown in FIG. 9B, even when the first casing 2a and the second casing 2b are separated from each other and the seal member 11 does not contact between the casings, the tube seal 16 expands and stops. Maintain aqueousness.
Further, as an emergency measure, the tube seal 16 may be filled with a solidifying material so as to expand and follow the displacement.

  In addition, since the operation effect by the water stop structure 10 'according to the second embodiment is the same as the operation effect of the water stop structure 10 shown in the first embodiment, detailed description thereof is omitted.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to said each embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, in each of the above embodiments, the sealing member is provided in two stages to improve the water-stopping property. However, the number of the sealing member is not limited, and may be one or three or more. .

Moreover, in addition to the water stop structure shown in the above embodiments, an embedded water stop plate may be used in combination.
Moreover, in the said embodiment, although the recessed part was formed in the end surface of a housing and it shall be arrange | positioned in this sealing part and this recessed part, what is necessary is just to form a recessed part as needed.

  Moreover, in each said embodiment, although the joint end surface plate shall be used as a part of mold form, it is good also as what arranges a mold form in the end surface of a 2nd housing separately.

Further, the frame constituting the underground structure is not limited to the box culvert, and can be used for any structure.
Further, the shape and the like of the housing are not limited.

  Further, the spacing member is not limited to bolts or carbon fibers.

10, 10 'Water stop structure 11 Seal member 12 Joint end face plate (pressing member)
13 Spacing member 16 Tube seal (seal member)
2 housing 2a first housing 2b second housing 20 recess 21 seal mounting surface

Claims (6)

A method for constructing a waterstop structure for an underground structure formed by connecting a first housing and a second housing,
A first housing construction process for constructing the first housing;
A seal mounting step of fixing the seal member to the seal mounting surface provided in the first housing;
A pressing member is disposed so as to face the seal mounting surface, and the sealing member is compressed between the seal mounting surface and the pressing member, and the pressing member and the press member are maintained so as to maintain a compressed state of the sealing member. A seal compression step for maintaining a constant separation distance from the first housing;
A construction method for a water stop structure, comprising: constructing a second housing next to the first housing, and a second housing construction step of fixing the pressing member to the second housing. The second housing is a concrete structure,
The construction method of the water stop structure according to claim 1, wherein the pressing member is used as a part of a concrete formwork when the second casing is formed. A water stop structure provided in an underground structure constituted by connecting a first housing and a second housing,
A seal member fixed to a seal mounting surface provided in the first housing;
A pressing member fixed to an end surface of the second casing facing the seal mounting surface;
An interval holding member that holds the separation distance between the seal mounting surface and the pressing member constant, and
The seal member is disposed in a compressed state between the seal mounting surface and the pressing member, and is in close contact with the pressing member by its own restoring force.   Before the relative displacement amount generated between the first housing and the second housing reaches the maximum value of the relative displacement amount that can maintain the water stop function by the seal member, the gap holding means is broken. The water stop structure according to claim 3. A recess is formed on an end surface of the first casing facing the second casing,
The water stop structure according to claim 3 or 4, wherein the seal mounting surface is formed on a bottom surface of the recess. 6. The seal member according to claim 3, wherein the seal member has a V-shaped cross section or a U-shaped cross section, and is disposed in an open state on the ground side. Water stop structure.

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