JP4461914B2 - Temporary deadline structure and temporary deadline method - Google Patents

Description

  The present invention relates to a temporary closing structure and a temporary closing method used when repairing an underwater structure such as an existing pier foundation, such as repair and reinforcement.

  The temporary cutoff structure is used when repairing an underwater structure such as a bridge foundation, and a temporary cutoff structure using a precast panel is disclosed in, for example, Patent Document 1.

  The provisional deadline structure disclosed in Patent Document 1 is preferably used in a place where there is an upper limit, and in order to cope with such a restriction, the panel is divided into upper and lower parts at a construction site. This was laminated. However, the temporary closing structure and the temporary closing method having such a configuration have a technical problem that a large cost is required to install and remove the temporary closing structure and a construction period is prolonged.

  Accordingly, the inventors of the present application have developed a temporary closing structure and a temporary closing method that can solve such problems and have already proposed in Patent Document 2. The provisional cutoff structure proposed in Patent Document 2 has a plurality of annular assemblies surrounding the outer periphery of the underwater structure, and is erected on the base portion of the underwater structure. An anchor is installed so as to penetrate vertically therethrough, and a tension force is introduced into the anchor so as to be fixed to the uppermost annular assembly.

  In addition, each annular assembly is obtained by connecting a plurality of precast panel units obtained by dividing an annular body having a predetermined height along the circumferential direction with a vertical sealing material between circumferential ends. A horizontal sealing material is interposed on the upper and lower joint surfaces of the annular assemblies stacked in the vertical direction.

The temporary closing structure having such a configuration can counteract the force in the shearing direction without incurring an increase in cost and lengthening of the construction period, but has technical problems described below. .
Japanese Patent Laid-Open No. 11-21908 Japanese Patent Application No. 2003-279550

  In other words, the provisional deadline structure proposed in Patent Document 2 is designed and manufactured in accordance with the shape and dimensions of the underwater structure to be repaired, such as a bridge foundation, and applied to each site. is doing.

  For this reason, the precast panels are made to order for each site, and after the completion of construction, they are basically handled as waste materials, which has been an obstacle to cost reduction.

  The present invention has been made in view of such conventional problems, and the object of the present invention is to make provisional deadlines that can achieve a significant cost reduction by making the precast panel divertable. The object is to provide a structure and a temporary closing method.

In order to achieve the above object, the present invention comprises a plurality of plate-like precast panels and a water stop member, and the water stop members are interposed between end faces of the precast panels so as to be separably connected. A temporary closing structure that is installed so as to surround an outer periphery of an underwater structure such as a bridge foundation and is used for repairing or repairing the underwater structure, wherein the precast panel has a width direction Inclined end faces with a predetermined angle provided on both end faces, a semicircular recess extending in the vertical direction at the center of the end face, and provided on the side face of the precast panel. and a bracket for holding the water element, said water-stop member is interposed between adjacent pair of the precast panel, a cylindrical steel pipe that varies the flexion by a pin coupling between these panels, Shirupakki With the door, the seal packing is housed the cylindrical steel pipe therein and has a cylindrical portion which is installed in the recess of the pair of the pre-cast panels arranged adjacently.

Further, the present invention includes a plurality of flat precast panels and a water stop member, and the water stop member is interposed between the end faces of the precast panel so as to be separably connected to each other. A temporary closing method that is installed when the outer periphery of a structure is bent and is used for repairing or reinforcing the underwater structure, wherein the precast panels are provided on both end faces in the width direction. An inclined end face having a predetermined angle, a semicircular recess extending in the vertical direction at the center of the end face, and a mounting bolt mounting bracket provided on a side surface of the precast panel, member is interposed between adjacent pair of the precast panel, a cylindrical steel pipe that the flexion variable by a pin coupling between these panels, and a seal packing, the sealing packing, said cylinder A cylindrical portion that accommodates the tube therein, and when the precast panel is connected adjacently in the circumferential direction, the cylindrical portion is installed in the concave portion of the pair of precast panels that are installed adjacent to each other. A fastening bolt is attached between the mounting brackets so as to sandwich the water stop member.

  According to the temporary closing structure and the temporary closing method constructed as described above, the plurality of flat-plate precast panels are separably connected with the water-stopping member interposed between the end faces, so that they are separated after use. Then, diversion at other construction sites becomes possible.

  In this case, when connecting the precast panels adjacent to each other in the circumferential direction, a cylindrical portion is installed in a recess of a pair of adjacent precast panels, and a fastening bolt is attached between the mounting brackets. Therefore, according to the inclination angle of the inclined end face, the precast panel can be connected in a polygonal shape, and water-stopping property can be secured.

  In the temporary closing structure, the water stop member protrudes from an outer periphery of the cylindrical portion, is interposed between the inclined end surfaces, and is attached with the fastening bolt between the mounting brackets. A flat fin portion sandwiched between the end faces can be provided.

  Further, in the temporary closing method, the water stop member includes a flat fin portion protruding from an outer periphery of the cylindrical portion, and the fin portion is interposed between the inclined end surfaces, and the mounting is performed. The said fastening bolt can be attached between the brackets for use, and the said fin part can be clamped.

  Furthermore, a frame that removably supports the lower end side of the precast panel can be installed in advance in the underwater structure.

  According to the temporary closing structure and the temporary closing method according to the present invention, the precast panel can be diverted, so that significant cost reduction can be achieved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

  1 to 7 show an embodiment of a temporary closing structure and a temporary closing method according to the present invention. The temporary closing structure and the temporary closing method shown in these drawings are applied when repair work such as repair and reinforcement of the bridge 10 that is an underwater structure is performed, and this embodiment shows such an application example. .

  The bridge 10 includes a pier 12 and a footing 14 that is a foundation portion integrally formed at the lower end thereof. The bridge pier 12 has an oval horizontal cross section, and the footing 14 is also formed in an oval shape having a planar shape similar to that of the pier 12, and a part of the lower end thereof is buried in the underwater ground 16. Yes.

  The temporary cutoff structure 18 according to the present embodiment includes a plurality of flat-plate precast panels 20. The temporary closing structure 18 is installed in a frame 22 fixed on the upper surface of the footing 14 so that the lower end side is detachable and surrounds the outer periphery of the pier 12, The drainage is used to create a dry environmental condition on the outer periphery of the pier 12 and to repair or reinforce the pier 12.

  The frame body 22 is formed in an oval shape that goes around the outer periphery of the pier 12, and is fixed to the footing 14 by an anchor 24. Further, a packing is provided in the frame body 22 to contact the lower end of the temporary cutoff structure 18 to ensure water stoppage.

  In the case of the present embodiment, the provisional shut-off structure 18 formed in an oval shape is stacked in three steps so as to surround the outer periphery of the pier 12 and protrude on the water surface. Although not shown in detail, a water-stopping packing is interposed between the temporary closing structures 18 stacked in a step shape.

  Further, the provisional deadline structure 18 stacked in a step shape is fixed by an anchor bolt 26 that is installed so as to penetrate the upper and lower direction. In this case, a plurality of anchor bolts 26 are installed at predetermined intervals along the oval shape of the temporary closing structure 18, and each anchor bolt 26 is fixed to the frame body 22 at the lower end side, A nut 27 is attached to the uppermost temporary closing structure 18 and fixed.

  In the case of the present embodiment, the temporary cutoff structure 18 includes a plurality of flat precast panels 20 and water-stopping members 21 as shown in a plan view in FIG. 2, and between the end faces in the width direction of the precast panels 20. Each of the water stop members 21 is interposed and connected in a separable manner to form an oval shape. The precast panel 20 is, for example, a flat plate made of steel or reinforced concrete, and is formed in a rectangular shape having a predetermined width and length.

  Each precast panel 20 is provided with an inclined end surface 20a having a predetermined inclination angle and a semicircular recess 20b, as shown in FIGS. In addition, as shown in FIGS. 3 and 6, mounting brackets 20 c for a plurality of fastening bolts 28 are provided on the inner and outer surfaces of the precast panel 20.

  The semicircular recess 20 b is located approximately at the center of the end surface in the width direction of the panel 20 and extends along the longitudinal direction of the panel 20. The inclined end surface 20a is on one side of the semicircular recess 20b, and is formed by partially cutting the end surface of the panel by a predetermined angle, for example, an angle of 15 to 30 °.

  For example, when the precast panel 20 forms a polygon, the inclined end surface 20a is arranged so that the end surface 20a is on the inner side. Such an inclined end face 20a can be provided not only on one side of the semicircular recess 20b but also on the entire end face.

  When the precast panel 20 is installed adjacent in the circumferential direction, the semicircular recess 20b corresponds to a position so that the pair faces each other. When the precast panel 20 is installed adjacent to the circumferential direction, the semicircular recess 20b faces between the pair of precast panels 20. A substantially circular vertical through-hole is formed by the recessed portion 20b.

  The mounting bracket 20c is positioned so as to correspond to the positions between the panels 20 so that the fastening bolts 28 installed so as to straddle between the precast panels 20 installed adjacently in the circumferential direction or the vertical direction can be mounted. Several are arranged.

  The water stop member 21 includes a hollow cylindrical steel pipe 21a and a rubber seal packing 21b. The seal packing 21b includes a cylindrical part 210b in which the cylindrical steel pipe 21a is housed, and a cylindrical part 201b. A pair of flat fin portions 211b projecting outward from the outer periphery of the plate.

  When the water stop member 21 thus configured forms the temporary cutoff structure 18, the cylindrical portion 210 b in which the cylindrical steel pipe 21 a is accommodated is formed in the recess 20 b of the pair of precast panels 20 that are adjacently installed. A fin portion 211b is installed between the inclined end surfaces 20a and is installed between the inclined end surfaces 20a. A fastening bolt 28 is attached between the mounting brackets 20c, and between the inclined end surfaces 20a. It is pinched, and thereby, the water stop inside is secured.

  In the case of the present embodiment, in the oval planar shape of the temporary closing structure 18 shown in FIG. 2, the parallel portions are connected to each other so that the precast panel 20 is substantially straight, and the parallel portions In the arc-shaped portions on both end sides, an inclined end surface 20a provided on the end surface of the precast panel 20 and a seal packing 21b having a cylindrical portion 210b in which the cylindrical steel pipe 21a is housed constitute a refraction variable pin structure. By using this pin structure, the precast panels 20 are arranged in a polygonal shape so as to have an oval shape while ensuring water-stopping properties.

  In addition, what is necessary is just to make it join the end surfaces of the part in which the inclination end surface 20a is not provided, when connecting the precast panel 20 in a straight line form. Further, as shown in FIGS. 1, 2 or 3, the plurality of precast panels 20 are connected to each other with a water stop member 21 and are connected to each other to form an oval shape. A support 30 or a support jack 32 is installed to stabilize the shape.

  In the temporary closing structure 18 formed as described above, when the work such as the repair of the pier 12 is completed, when the fastening bolt 28 is removed from the bracket 20c, each precast panel 20 can be separated. Can be diverted to the site.

  Next, the temporary closing method using the temporary closing structure 18 configured as described above will be described. When repairing the pier 12 or the like, first, as shown in FIG. 1, the frame 22 is formed on the upper surface of the footing 14 in an oval shape so as to go around the outer periphery of the pier 12.

  When the frame body 22 is fixed to the footing 14 by the anchor 24, the temporary closing structure 18 is installed so that the lower end side is inserted into the frame body 22. In this case, the temporary closing structure 18 is detachably installed at the lower end side with respect to the frame body 22, and a water stop packing is interposed therebetween.

  The temporary shut-off structure 18 surrounds the outer periphery of the pier 12 by interposing a water-stopping member 21 between the end faces of the plurality of flat-plate-shaped precast panels 20 and detachably connecting the precast panels 20. Thus, it is formed in an oval shape.

  The precast panel 20 is provided on inclined side surfaces 20a of a predetermined angle provided at both ends in the width direction, a semicircular recess 20b extending in the vertical direction at substantially the center of the inclined end surface 20, and provided on the side surfaces of the precast panel 20. The mounting bracket 20c of the fastening bolt 28 is provided.

  Moreover, the water stop member 21 includes a cylindrical portion 210b that houses the cylindrical steel pipe 21a therein, and a pair of flat fin portions 211b that protrude from the outer periphery of the cylindrical portion 210b.

  When forming the oval temporary cut-off structure 18 with a plurality of precast panels 20, the precast panels 20 are sequentially connected adjacently in the circumferential direction. In this case, as shown in FIG. 6, the water stop member 21 is installed so that the tubular portion 201 b is inserted into the concave portion 20 b of one precast panel 20 that is adjacently installed, and the water stop member 21. The other precast panel 20 is installed from the outside.

  At this time, the semicircular recess 20b of the other precast panel 20 is installed so as to cover the tubular portion 210b of the water stop member 21 from the outside. Next, with the fin portion 211b interposed between the inclined end surfaces 20a, the fastening bolts 28 are attached between the mounting brackets 20c to sandwich the fin portion 211b between the inclined end surfaces 20a.

  In this case, in the oval planar shape of the temporary closing structure 18, the parallel portions are connected to each other so that the precast panel 20 is substantially straight, and the arc-shaped portions on both end sides of the parallel portion. Is formed into an oval shape while ensuring water-stopping properties by using the inclined end surface 20a provided on the end surface of the precast panel 20 to form a polygonal shape by connecting the precast panels 20 so that they are refracted. .

  When the temporary cut-off structure 18 for one stage is formed, the temporary cut-off structure 18 on the upper stage is sequentially stacked. At this time, a packing for water stop is interposed between the structures 18. When the predetermined number of steps of the temporary closing structure 18 are formed, the nut 27 is attached to the anchor bolt 26 to obtain the required temporary closing structure 18, and the support 30 is installed inside, so that the shape or structure Stabilize.

  When reinforcement and repair of the pier 12 are completed, the temporary closing structure 18 is disassembled and removed. In this case, when the fastening bolt 28 is removed from the bracket 20c, each precast panel 20 can be separated. It can be used as it is for other construction sites.

  Now, according to the temporary closing structure and the temporary closing method constructed as described above, the plurality of flat-plate precast panels 20 are connected to each other with the water-stopping member 21 interposed between the end faces. Therefore, if it is separated after use, it can be transferred to other construction sites.

  In this case, the precast panel 20 includes an inclined end surface 20a having a predetermined angle provided on both end surfaces in the width direction, a semicircular recess 20b extending in the vertical direction at a substantially central portion of the end surface, and a side surface of the precast panel 20. The water stop member 21 includes a cylindrical portion 210b that houses the cylindrical steel pipe 21a therein, and a flat plate-like shape that protrudes from the outer periphery of the cylindrical portion 210b. When connecting the precast panel 20 adjacent to each other in the circumferential direction, the tubular portion 210b is installed in the recess 20b of the pair of precast panels 20 that are installed adjacent to each other and between the inclined end surfaces 20a. With the fins 211b interposed, the fastening bolts 28 are attached between the mounting brackets 20c, and the fins 211b are sandwiched between the inclined end surfaces 20a. According to the inclination angle of the inclined end surface 20a, it is possible to connect the precast panel 20 into a polygonal shape, it is possible to also ensure water stopping.

  In addition, since the securing of the water stop can be ensured by attaching the fastening bolt 28 between the brackets 20c and holding the cylindrical portion 210b accommodating the cylindrical steel pipe 21a, the fin portion 211b is not necessarily required. do not do.

  In the above embodiment, the case where the provisional deadline structure 18 is stacked and installed on the outer periphery of the pier 12 is exemplified. However, the implementation of the present invention is not limited to this, for example, the provisional deadline structure. The body 18 may be one-stage.

  In the above embodiment, the case where the present invention is applied to the modification of the bridge pier 12 on the small judgment surface is illustrated, but the application of the present invention is not limited to such a shape. It can also be applied to underwater structures with cross sections.

  In the temporary cutoff structure according to the present invention, in particular, the cylindrical portion 210b of the water stop member 21 and the cylindrical steel pipe 21a inserted into the recess 20b between the adjacent precast panels 20 have a pin structure. The following effects can be obtained.

  In other words, the precast panel 20 attached with the fastening bolt 28 to the bracket 20c and coupled via the pin structure can be changed in the bent state. For example, when the precast panel 20 is formed into a circular cross section or an arc cross section. In addition, when the competition between panels occurs, the bending state can be changed and fine adjustment can be performed, so it corresponds to the actual closed block such as a circular, elliptical or polygonal section at the construction site. Can be done easily.

  The temporary closing structure and the temporary closing method according to the present invention can be effectively used for repair work of a pier because the precast panel can be diverted to other construction sites.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall explanatory view showing one embodiment of a temporary closing structure and a temporary closing method according to the present invention. It is a principal part horizontal sectional view of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view of FIG. It is a perspective view which shows the end surface of the precast panel shown in FIG. It is explanatory drawing at the time of connecting the precast panel shown in FIG. It is end surface explanatory drawing at the time of the completion of the connection of the precast panel shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bridge 12 Pier 14 Footing 18 Temporary cutoff structure 20 Precast panel 20a Inclined end surface 20b Semicircular recessed part 20c Mounting bracket 21 Water stop member 21a Cylindrical steel pipe 21b Seal packing 210b Cylindrical part 211b Fin part 28 Fastening bolt

Claims (5)

A plurality of flat-shaped precast panels and a water stop member are provided, and the water stop members are interposed between the end faces of the precast panel, and are separably connected to surround an outer periphery of an underwater structure such as a bridge foundation. A temporary closing structure that is installed to bend and is used when repairing or reinforcing the underwater structure,
The precast panel has inclined end surfaces of a predetermined angle provided on both end surfaces in the width direction,
A semicircular recess extending in the vertical direction at the center of the end surface;
Provided on a side surface of the precast panel, and a bracket for attaching the fastening bolt to sandwich the water stop member,
The water stop member is provided between a pair of adjacent precast panels, and includes a cylindrical steel pipe that is pin-bonded between these panels to change the bending state, and a seal packing.
The said seal packing accommodates the said cylindrical steel pipe inside, and has a cylindrical part installed in the said recessed part of a pair of said precast panel adjacently installed, The temporary closing structure characterized by the above-mentioned. The water-stop member protrudes from the outer periphery of the cylindrical portion, is interposed between the inclined end surfaces, and has a flat plate shape that is clamped between the inclined end surfaces by attaching the fastening bolt between the mounting brackets. The provisional deadline structure according to claim 1, further comprising a fin portion. A plurality of flat-shaped precast panels and a water stop member are provided, and the water stop members are interposed between the end faces of the precast panel, and are separably connected to surround an outer periphery of an underwater structure such as a bridge foundation. It is a temporary closing method that is installed to bend and is used when repairing or reinforcing the underwater structure,
The precast panel has inclined end surfaces of a predetermined angle provided on both end surfaces in the width direction,
A semicircular recess extending in the vertical direction at the center of the end surface;
A mounting bolt mounting bracket provided on a side surface of the precast panel;
The water stop member is provided between a pair of adjacent precast panels, and includes a cylindrical steel pipe that is pin-bonded between these panels to change the bending state, and a seal packing.
The seal packing includes a cylindrical portion that houses the cylindrical steel pipe therein,
When connecting the precast panels adjacent to each other in the circumferential direction, the cylindrical portion is installed in the recess of the pair of precast panels installed adjacent to each other, and a fastening bolt is attached between the mounting brackets. A temporary closing method characterized by sandwiching the water stop member. The water stop member includes a flat fin portion protruding from the outer periphery of the cylindrical portion,
The temporary closing method according to claim 3 , wherein the fin portion is interposed between the inclined end faces, the fastening bolt is attached between the mounting brackets, and the fin portion is clamped. The temporary closing method according to claim 3 , wherein a frame that removably supports a lower end side of the precast panel is installed in advance in the underwater structure.

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