JP4214108B2 - Post-installation type flexible joint device capable of expanding and contracting concrete structures - Google Patents

Description

  The present invention relates to a stretchable post-installation type flexible joint device that is interposed in a joint portion that connects adjacent concrete structures and prevents water leakage by a watertight member having elasticity.

There are many inventions and devices for preventing water leakage at joints connecting concrete structures, but it is necessary to consider the construction tolerance of the concrete structure in any case. This construction tolerance is usually ± 2 cm, and all construction must be performed within this range. That is, the size adjustment between the post-installation type flexible joint device and the concrete structure can be made by manufacturing the post-installation type flexible joint device to a size of 2 cm and cutting and joining to the concrete structure, or cutting the concrete structure. A construction method such as mounting a post-filling construction type flexible joint device has been used. Also, when anchor bolts are driven into a concrete structure by post-construction, the position adjustment with the existing reinforcing bars in the concrete structure has been a problem in the past, and in some cases, the existing reinforcing bars are scraped or cut. Can happen. When similar techniques were searched in the technical field to which the present invention belongs, the following eight inventive ideas were found. However, none of these can meet the above-mentioned problems, and other applications are not problematic.

Shokai 58-63233 Japanese Patent No. 2721472 Japanese Patent No. 2753818 Japanese Patent No. 2849365 Japanese Patent No. 3045990 JP 2002-21166 JP 2003-113699 A JP 2003-343199 A

  The present invention has been made paying attention to the above points, and the problem is that it is possible to connect joints between adjacent concrete structures within the range of construction tolerance, and it is easy to adjust the position of the reinforcing bar. Is to be able to do it.

  In order to solve the above-mentioned problems, the present invention is an extendable post-installation type flexible joint device for preventing water leakage by a watertight member having elasticity, which is interposed in a joint portion connecting adjacent concrete structures. About the pressing member for fixing the watertight member to the inner wall of the concrete structure, divided into multiple parts to match the length of the concrete structure with the length in the cross-sectional direction, and the divided pressing members Each presser member is arranged so that the interval of the presser can be adjusted, and a compression auxiliary plate is applied to the outside of the presser member so as to cover the adjustment gap and assist the presser force. It is fixed and slidable with respect to the other pressing member, and means for pressing against the watertight member in the adjustment gap is taken.

The concrete structure targeted in the present invention is for constructing a waterway and has a reinforcing bar. In addition to a closed cross-sectional structure, the form is generally a box-shaped cross section including an open channel type structure having an open upper surface. In order to prevent water leakage, a watertight member is attached to the inside of the joint where the concrete structures are connected to each other. The watertight member is made of rubber or other resin material as commonly called watertight rubber, for example, and has a resilience and is designed to have a size capable of being in close contact with the inner wall of the concrete structure. It is made and intended to absorb the various stretches that occur between adjacent concrete structures due to its elasticity. The above matters are general matters necessary for water-stopping joints in concrete structures.

  A holding member is used to fix the watertight member to the inner wall of the concrete structure. A pressing member is a member for attaching the water stop part of a watertight member so that it may press on the inner wall surface of a concrete structure. Conventionally, there is a construction tolerance in the concrete structure, and much labor is required for adjustment with the post-installation type expansion / contraction flexible joint device.

  Therefore, in the present invention, the pressing member is divided into a plurality of parts in the circumferential cross-section direction of the concrete structure, and the pressing members obtained by the division are provided with adjustment gaps without contacting the respective end portions. It shall be allowed to place. It is sufficient that the adjustment gap is about twice the construction tolerance in the concrete structure.

  On the other hand, since the pressing member is divided into a plurality of parts, the fixing force by the pressing member does not reach the water stop portion of the watertight member in the adjustment gap portion. Is applied to the outside of the pressing member, and a necessary pressing force is exerted on the compression auxiliary plate even in the adjustment gap portion. The auxiliary compression plate shall have the minimum thickness that can transmit the required pressing force. The compression assisting plate is sufficiently larger than the width of the adjustment gap, has a length that covers both of the divided pressing members, is fixed to one pressing member, and is not fixed to the other pressing member. Is also provided so that it can slide without being fixed.

  The watertight member is fixed via the pressing member by anchor bolts that are driven into the inner wall of the concrete structure, but a cover member may be provided to counter the pressure of the water flow that flows in the concrete structure. This cover member can be mounted in a cantilever manner by sharing the anchor bolt. Thereby, the swelling of the watertight member due to the water pressure is prevented. Further, by making the cover member a cantilever type, expansion / contraction flexibility is also ensured. Further, it is desirable that an external water pressure protection plate is interposed between the watertight member and the cover member, and an internal water pressure protection plate is interposed between the watertight member and the inner wall of the concrete structure.

  Furthermore, it is desirable to install a seal member made of a water-expandable sponge or the like on the water stop surface where the water-tight member is in contact with the inner wall surface of the concrete structure, so that minor irregularities on the concrete water stop surface can be repaired. In addition, on the upstream side of the watertight member, a rectifying plate that smoothly connects the inner wall surface of the concrete structure and the inner surface of the watertight member or the inner surface of the cover member can be attached. Loss can be significantly reduced.

Since this invention is comprised in this way, the joint part of adjacent concrete structures can be easily connected within the range of construction tolerance, and it arranges with an adjustment gap in the case of connection. Since the water stop part of the watertight member is fixed by the pressing member divided into a plurality of parts, the construction can be completed accurately without taking time for construction, and the compression gap plate is applied to the adjustment gap part. Since the water-stop part of the water-tight member is compressed, the water-stop effect by the water-tight member is not different from the case of the pressing member that is not divided.

  Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 shows a cross-sectional shape of a concrete structure, and FIG. 2 is an illustration of a post-installable flexible joint device 10 that can expand and contract a concrete structure according to the present invention. Is shown in The illustrated concrete structure has an octagonal shape with a rectangular cross section and chamfered corners at four corners, and the device according to the present invention is provided inside the connection point 13 of the adjacent concrete structures 11 and 12. 10 is installed. 2 and 3, the left is upstream and the right is downstream (see arrows).

In the device 10 according to the present invention, a watertight member 15 made of an elastic material is disposed inside the connection joint portion 13. The watertight member 15 has a bellows-like stretchable flexible portion 14 and water stop portions 16 and 17 at both ends thereof. The watertight member 15 has a size capable of being in close contact with the inner walls of the concrete structures 11 and 12, and a pressing member 18 for fixing the watertight member 15 to the concrete structures 11 and 12 is provided on the concrete structures 11 and 12. It is divided into eight parts each having a length corresponding to each of the eight sides. Moreover, in order to arrange the divided pressing members with the adjustment gap 19 between them, the side lengths of the concrete structures 11 and 12 are made shorter by considering the construction tolerance. The construction tolerance is ± 2 cm in the present invention.

  For the convenience of explanation, the holding members are unified to 18 on the upstream side and the downstream side, the holding member appearing at the center in the cross section is 18, and the left and right holding members are represented by 18 ′ and 18 ″, respectively (FIG. 5). In the illustrated example, the pressing members 18, 18 ′, 18 ″ are related by a backing structure called a compression auxiliary plate 21. In the example of FIGS. 4 and 5, the compression auxiliary plate 21 bent at an angle of 45 degrees is fixed to the left and right sides of the central pressing member 18 by welding at the short side portion, and the long side rising obliquely outward therefrom The portion overlaps the left and right pressing members 18 ', 18 ". The welded portion is indicated by reference numeral 22. Therefore, the portion overlapping the left and right pressing members 18', 18" reliably covers the adjustment gaps 19, 19 '. . Reference numeral 23 denotes an anchor bolt, and 24 denotes the insertion hole.

  In order to prevent the watertight member 15 from expanding due to the external water pressure, the cover members 25 and 26 that oppose the external water pressure are attached to the cantilever by the anchor bolts 23. Since the cover members 25 and 26 are only fixed by the anchor bolts 23 and 23, the expansion and contraction flexibility of the watertight member 15 is not hindered. Further, an external water pressure protection plate 27 is interposed between the watertight member 15 and the cover members 25 and 26, and an internal water pressure protection plate 28 is interposed between the watertight member 15 and the inner walls of the concrete structures 11 and 12. The watertight member 15 is prevented from being pushed in by the external water pressure or the internal water pressure.

In FIG. 3, reference numeral 29 denotes a seal member, which is attached to a water-stop surface in contact with the concrete structures 11 and 12 by the water-tight member 15, repairing slight unevenness of the water-stop surface and ensuring water-tightness. In FIG. 3, reference numeral 31 denotes a tension stopper, which is attached to the distal end portion of the pressing member 18 by means of welding or the like, engages with the concave portion of the watertight member 15, and a tensile force is applied to the watertight member 15. The water stop portions 16 and 17 are prevented from moving out of the water stop surface. Reference numeral 32 denotes a compression stopper, which is provided to restrict the tightening of the anchor bolt 23 and optimize the water stop portions 16 and 17. A rectifying plate 33 that smoothly connects the inner wall surface of the concrete structure 11 and the inner surface of the water-tight member 15 or the inner surface of the cover member 25 is provided on the upstream side of the water-tight member 15 having such a structure.

The stretchable post-installation type flexible joint device 10 according to the present invention configured as described above is installed in the connecting joint portion 13 of the adjacent concrete structures 11 and 12, thereby using the concrete structure and the water channel. When constructing a building, it is possible to achieve a thorough water leakage prevention effect, and to obtain a sufficiently satisfactory effect not only for retrofitting to an existing structure but also for new construction. Especially in the case of post-installation, there is a problem of how to adjust the position of the anchor bolt with the position of the reinforcing bar of the concrete structure, but in the present invention, the holding members divided into a plurality of parts are arranged with an adjustment gap. By doing so, adjustment with the reinforcing bars in the transverse direction is possible, and adjustment in the longitudinal direction is possible by securing an adjustment amount in the width of the watertight member 15.

  Various water-stop plates are attached to the joints between concrete structures for waterways, which serve the intended purpose, but the water-stop ability of the water-stop plates decreases due to aging and changes in load and foundation conditions. Stretchable post-installation type flexible joint that has a pressing member length adjustment function that enables a short-time construction against a water leakage accident due to internal and external water pressure acting on the joint due to displacement exceeding the limit of water stop performance It became possible to provide a device. Further, the present invention is characterized by being suitable for post-construction, but as already mentioned, it is suitable for new construction.

Explanatory drawing which shows the cross-sectional shape of the concrete structure used as the object of this invention. Explanatory drawing which shows the Example of the post-installation type flexible joint apparatus which can expand-contract the concrete structure based on this invention. Explanatory drawing which expanded the principal part of FIG. The top view for demonstrating the apparatus which concerns on this invention. FIG. 5 is a cross-sectional view corresponding to part of FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Post-installation type flexible joint apparatus which can expand and contract a concrete structure 11, 12 Concrete structure 13 Connection joint location 15 Watertight member 18, 18 ', 18 "Holding member 19, 19' Adjustment gap 21 Compression auxiliary plate 23 Anchor bolt 24 Insertion holes 25, 26 Cover member 27 External water pressure protection plate 28 Internal water pressure protection plate 29 Seal member 33 Rectification plate

Claims (4)

It is a post-installation type flexible joint device that can be expanded and contracted to prevent water leakage by a watertight member having elasticity, interposed in a joint location that connects adjacent concrete structures,
The holding member for fixing the watertight member to the inner wall of the concrete structure is divided into a plurality of parts in order to match the length in the cross-sectional direction of the concrete structure with the field, and the interval between the divided holding members is set. Each presser member is arranged so that it can be adjusted, and a compression auxiliary plate is applied to the outside of the presser member to cover the adjustment gap and assist the pressing force, and the compression auxiliary plate is attached to one of the adjacent presser members . A post-installation type flexible joint device capable of expanding and contracting a concrete structure, characterized in that it is fixed with respect to one of the other pressing members adjacent thereto and is slidable against the watertight member in the adjustment gap. . The watertight member is fixed via the pressing member by anchor bolts that are driven into the inner wall of the concrete structure, and the internal water pressure protection plate and the external water pressure that do not hinder expansion / contraction flexibility against the internal water pressure and the external water pressure acting on the watertight member. The concrete structure according to claim 1, further comprising a cover member that can be installed in a cantilevered manner by the anchor bolts, and a cover member that opposes external water pressure is interposed therebetween. Flexible joint device. The flexible post-installation type flexible structure for a concrete structure according to claim 1, wherein the watertight member has a structure in which a sealing member made of a water-expandable sponge or the like is attached to a waterstop surface in contact with the inner wall surface of the concrete structure. Fitting device. The concrete structure according to claim 1, wherein a current plate that smoothly connects the inner wall surface of the concrete structure and the inner surface of the watertight member or the inner surface of the cover member is attached to the upstream side of the watertight member. Post-installation type flexible joint device.

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