JP6619204B2 - Deadline method and water barrier structure - Google Patents

Description

  The present invention relates to a closing method and a water blocking wall structure, and more particularly to a closing method and a water blocking wall structure suitable for reinforcing and repairing a bridge pier standing in water such as a river or the sea.

  Conventionally, when reinforcing and repairing a bridge pier standing underwater, the pier is surrounded by a cylindrical water blocking wall, leaving a space necessary for the work around the pier, and the water in the space inside the water blocking wall is The deadline method is used to provide a dry working space by pumping up.

  As an example of such a deadline construction method, the plurality of liners are formed around the columnar piers standing on the upper surface of the footing by the buoyancy of buoyancy tanks respectively provided on the plurality of liner plates constituting the water blocking wall body. There has been proposed a method of forming a water blocking wall main body by connecting the plates one by one in the horizontal direction while floating the plates (see, for example, Patent Document 1).

JP 2011-58172 A

  However, in the deadline construction method of Patent Document 1, when a water blocking wall body is formed by stacking a plurality of liner plates in the vertical direction according to the water depth from the water surface to the upper surface of the footing, the liner plate is connected and fixed in the vertical direction. A lot of diving work was needed. Therefore, in this deadline construction method, there was a problem that workability was poor and a long construction period was required until the water blocking wall body was formed.

  The present invention has been made in view of the above problems, and its purpose is to improve the workability and to provide a water stop wall structure and a water stop wall structure capable of forming a water stop wall structure in a shorter construction period than before. Is to provide.

  In order to achieve the above object, the present invention forms a water blocking wall structure by installing a ring body so as to surround at least a part of a submerged structure via a gap, and the water blocking wall is formed. A deadline method for discharging the water inside the structure to provide a work place, wherein a lifting device is installed on a portion of the structure located on the water surface, and the structure between the lifting device and the water surface is provided. A first step of installing a scaffold with an outer diameter smaller than the inner diameter of the water blocking wall structure on the outer surface, and a buoyancy in which a buoyancy body for reducing the weight of the ring body relative to the lifting device is installed on the ring body A second step of lowering the attached ring body vertically below the scaffold by the lifting device; and an upper end portion exposed from the water surface of the buoyant ring body lowered vertically from the scaffold. Ring body or A third step of connecting the buoyant ring bodies so as to be stacked in the vertical direction to form the water blocking wall structure, a fourth step of sinking the water blocking wall structure in water and installing it at the bottom of the water, And a fifth step of discharging water inside the water blocking wall structure installed at the bottom of the water.

  In the present invention, the second step includes a buoyancy ring body forming step of forming the buoyancy ring body by attaching the buoyancy body to the ring body via a predetermined reinforcing ring.

  In the present invention, in the second step, the ring with buoyancy set so that a ratio of a force sinking in water of a ring body in which the buoyancy body is not installed and a buoyancy of the buoyancy body is larger than 1. It is characterized by using a body.

  In the present invention, there is provided a water stop wall structure that provides a work place by discharging water in a space formed by surrounding at least a part of a submerged structure via a space. In order to form a body, a plurality of ring bodies having a shape stacked in a vertical direction in a state of being surrounded by a space around the structure, and lifting and lowering installed on a portion of the structure located on the water surface In order to reduce the weight of the plurality of ring bodies, which are sequentially lowered vertically below the scaffold via the device, with respect to the lifting device, buoyancy bodies respectively installed on the plurality of ring bodies are provided. And

  ADVANTAGE OF THE INVENTION According to this invention, a water stop wall structure can be formed in a construction period shorter than before, improving workability by reducing underwater work further than before.

It is process drawing with which it uses for description of the installation process of installation of a raising / lowering apparatus and installation of a scaffold in the deadline construction method which concerns on embodiment of this invention. It is process drawing with which it uses for description of the connection process which connects a ring body with a buoyancy in the deadline construction method which concerns on embodiment of this invention. It is a figure which shows the ring body of the weight which can be suspended with the raising / lowering apparatus in the deadline construction method which concerns on embodiment of this invention. It is a rough-line perspective view which shows the structure of the liner plate of the ring body used in the deadline construction method concerning embodiment of this invention. It is a rough-line perspective view which shows the structure of the reinforcement ring used in the deadline method concerning embodiment of this invention. It is a figure with which it uses for description of the attachment state of the single float used in the deadline construction method concerning embodiment of this invention. It is process drawing with which it uses for description of the descent | fall process to which a ring body with a buoyancy is fall | descended vertically lower than a scaffold in the deadline construction method concerning embodiment of this invention. It is process drawing which uses for description of the lamination | stacking process of laminating | stacking another ring body with a buoyancy along the axial direction in the upper end part of the ring body with a buoyancy exposed from the water surface in the deadline construction method which concerns on embodiment of this invention. In the deadline construction method according to the embodiment of the present invention, a water stop wall structure composed of a plurality of buoyant ring bodies is installed at the bottom of the water, and the installation drainage process for discharging the water inside the water stop wall structure is described. It is process drawing to provide. It is a figure where it uses for description of the attachment state spaced apart from the water-stop wall liner plate in other embodiment. It is a figure with which it uses for description of the attachment state which attached the strip | belt-shaped float instead of the single-piece | unit float in other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiment described below is merely an example, and can take various forms within the scope of the present invention.

<Deadline method>
First, the closing method in the embodiment of the present invention will be described with reference to FIGS. When reinforcing and repairing piers standing in water such as rivers and seas, it is necessary to temporarily secure a dry work space around the pier, and a temporary construction method to secure this work space, Generally called an underwater deadline or a temporary deadline, and in the present invention, it is called a deadline construction method. The deadline construction method of the present invention is particularly effective when the distance from the water surface to the bottom of the water (depth) is longer than the distance from the water surface to the bridge girder (hereinafter referred to as “empty head”). It is an invention.

  In general, the water barrier structure formed by the deadline method is sufficient depending on the hydrostatic pressure due to the surrounding water, the flowing water pressure due to the water flow, the wave pressure due to the waves, etc. And water stop performance is needed. The structure to which the worker performs reinforcement / repair work via the water blocking wall structure of the present invention is, for example, an existing pier that is at least partially submerged.

  As shown in FIG. 1, a footing 1 is formed on a foundation pile (not shown) embedded in the ground of the water bottom. A pier 2 is integrally formed on the footing 1, and a bridge girder portion 3 including a beam portion protruding in the horizontal direction is integrally formed at the upper end of the pier 2.

  In the closing method according to the present embodiment, the lifting device 4 is installed at a predetermined position of the bridge girder portion 3 integrated at the upper end of the pier 2. That is, the elevating device 4 is installed at an arbitrary part of the bridge girder 3 or the pier 2 located on the water surface 6. The lifting device 4 is a hoisting device that winds up the wire 4a, and a ring body 8 (FIG. 2) or a buoyancy ring body 7a (FIG. 7), which is a lifting object, is lifted at the tip of the wire 4a, or A hook (not shown) for hanging is provided.

  In the closing method, a scaffold having an outer diameter smaller than the inner diameter of a water blocking wall structure 70 (FIG. 9) described later is formed on the outer peripheral surface of the bridge pier 2 between the lifting device 4 and the water surface 6 by this closing method. 5 is installed. The scaffold 5 is used for providing a work area where an operator forms the water blocking wall structure 70 on the water. Such installation of the lifting device 4 and the scaffold 5 corresponds to the first step (installation step) in the deadline method of the present invention. In the first step, not only the scaffold 5 is installed after the lifting device 4 is installed, but also the lifting device 4 may be installed after the scaffold 5 is installed, or the lifting device 4 and the scaffold 5 may be installed simultaneously. .

  Subsequently, as shown in FIG. 2, in the deadline method, an operator forms a lower ring body 8 by connecting a plurality of liner plates 9 in the horizontal direction on the scaffold 5, that is, on the water. The operator attaches the wire 4 a of the lifting device 4 to the lower ring body 8 and suspends the lifting device 4 so that the upper end portion of the lower ring body 8 is exposed from the water surface 6. In this case, as shown in FIG. 3, the weight by which the lifting device 4 can be suspended is the total weight of the two-stage ring bodies 8 stacked in the vertical direction.

  As shown in FIG. 4, the liner plate 9 constituting the ring body 8 is a structure in which flanges are provided on four sides of a section 9s made of a corrugated thin steel plate. Longitudinal flanges 9a and 9a are formed along the horizontal direction at the upper and lower ends in the vertical direction in the drawing of the section 9s, and short-side flanges 9b and 9b are formed at the left and right ends in the horizontal direction in the drawing. It is formed along the vertical direction.

  A plurality of through holes 9ah for connecting the liner plates 9 to each other in the vertical direction by bolts and nuts are formed in the longitudinal flange 9a. A plurality of through holes 9bh for connecting the liner plates 9 to each other in the horizontal direction by bolts and nuts are formed in the short-side flange 9b.

  An operator forms a lower ring body 8 in FIG. 2 by connecting a plurality of liner plates 9 in the horizontal direction on the scaffold 5. Then, the operator connects the plurality of further liner plates 9 in the horizontal direction on the scaffold 5 to form the upper ring body 8 in FIG. Thereafter, the operator connects the scaffold 5 with the reinforcing ring 10 interposed between the lower ring body 8 and the upper ring body 8 so as to be stacked in the vertical direction.

  As shown in FIG. 5, the reinforcing ring 10 is made of H-shaped steel, and is configured in a ring shape by connecting a plurality of reinforcing ring pieces 10s to each other along the horizontal direction. The reinforcing ring 10 includes a web 11 with which the longitudinal flange 9a of the liner plate 9 abuts, and an outer flange 12out and an inner flange 12in that are integrally provided on both the left and right sides of the web 11.

  The web 11 is formed with a plurality of through holes 11h provided at predetermined intervals. The plurality of through holes 11 h are provided at the same pitch as the plurality of through holes 9 ah provided in the longitudinal flange 9 a of the liner plate 9.

  In the outer flange 12out, a plurality of through holes 12uh and 12dh are formed in the upper and lower stages in the vertical direction along the horizontal direction. The plurality of through holes 12 uh and 12 dh are provided at the same pitch as the through holes 11 h of the web 11.

  As shown in FIG. 6 (A), the operator places the web 11 of the reinforcing ring 10 on the longitudinal flange 9a of the liner plate 9 of the lower ring body 8 on the scaffold 5, A longitudinal flange 9 a in the liner plate 9 of the upper ring body 8 is placed on the web 11.

  Then, in a state where the plurality of through holes 11h in the web 11 of the reinforcing ring 10 and the plurality of through holes 9ah in the longitudinal flange 9a of the liner plate 9 are opposed to each other, a lower ring is formed by bolts and nuts (not shown). The body 8, the reinforcing ring 10, and the upper ring body 8 are connected to each other so as to be stacked along the vertical direction. That is, the three members are integrated with the reinforcing ring 10 sandwiched between the longitudinal flange 9a of the liner plate 9 of the lower ring body 8 and the longitudinal flange 9a of the liner plate 9 of the upper ring body 8. Fixed.

  After the lower ring body 8 and the upper ring body 8 are connected to each other through the reinforcing ring 10 in this way, the operator puts the single float 20 on the reinforcing ring 10 on the scaffold 5. Install.

  As shown in FIGS. 6B and 6C, the single float 20 is an independent single buoyancy body formed of, for example, a styrofoam ellipsoid. The single float 20 has a rope insertion hole 20h formed so as to penetrate the central portion thereof, and a rope 20r is inserted through the rope insertion hole 20h.

  Specifically, a through-hole provided in the lower stage in the vertical direction of the outer flange 12out of the reinforcing ring 10 in a state where the rope 20r of the single float 20 is hooked on the U-shaped main body portion of the shackle 13 which is a U-shaped connecting bracket. The single float 20 is attached to the reinforcing ring 10 by inserting a pin into the through hole of the U-shaped main body portion of the shackle 13 and tightening with a nut. In this case, the single float 20 is attached to the mutually opposing positions of the reinforcing ring 10 configured in a ring shape. Forming the buoyancy ring body 7a by attaching the single float 20 to the ring body 8 via the reinforcing ring 10 corresponds to the buoyancy ring body forming step in the closing method of the present invention.

  In addition, although the single float 20 described the case where it attached to the through-hole 12dh provided in the perpendicular | vertical lower stage of the outer side flange 12out of the reinforcement ring 10 via the shackle 13, it is not restricted to this, The reinforcement ring 10 You may make it attach to the through-hole 12uh provided in the perpendicular | vertical upper stage of the outer side flange 12out via the shackle 13. FIG.

  The rope 20r is set to a predetermined length. When the single float 20 is attached to the reinforcing ring 10 via the rope 20r, the single float 20 and the reinforcing ring 10 are in close contact with each other. Two or more of the single floats 20 are attached to the reinforcing ring 10 at positions facing each other in consideration of the balance of the tilted state when the ring body 8 is floating in the water. Any number in consideration of the balance of the tilt state may be attached at any position. The single float 20 may be attached to the reinforcing ring 10 in advance.

  Thus, the lower ring body 8, the upper ring body 8, the reinforcing ring 10, and the single float 20 constitute the first layer (lowermost layer) buoyant ring body 7 a. However, the present invention is not limited to this, and the single float 20 may be directly attached to the liner plate 9 of one ring body 8 via a predetermined mounting plate (not shown). In this case, the ring body 7 a with buoyancy is constituted by only one ring body 8 and the single float 20. Alternatively, it is possible to configure one buoyant ring body 7 a by combining a plurality of ring bodies 8 and a single or a plurality of single floats 20.

  Here, in the ring body with buoyancy 7a, if the force sinking in water is 100% when two or more single floats 20 are not attached, the buoyancy by the two or multiple single floats 20 is 90% or more 100 It is set to be less than%.

  That is, the ratio of the force sinking in the water of the buoyancy ring body 7a in a state where the two or more single floats 20 are not attached to the buoyancy by the two or multiple single floats 20 is greater than 1. Is set. Thus, the two or more single floats 20 apparently reduce the weight of the buoyant ring body 7a about to sink in water to substantially zero, and the force sinking in water is slightly larger than the buoyancy. Therefore, the ring body 7 a with buoyancy is prevented from rising toward the water surface 6.

  In the deadline method, as shown in FIG. 7, the first layer buoyancy ring body 7a is moved vertically below the scaffold 5 by the elevating device 4, and the upper layer of the first layer buoyancy ring body 7a is moved. The upper end of the ring body 8 is lowered to a position exposed from the water surface 6. Such a descent of the buoyant ring body 7a by the elevating device 4 corresponds to the second step (descent step) in the deadline method of the present invention. The second step may include the above-described buoyancy ring body forming step.

  In the deadline method, the operator should configure the second layer of the buoyant ring 7b on the scaffold 5 on the longitudinal flange 9a of the liner plate 9 of the upper ring body 8 exposed from the water surface 6. After placing the longitudinal flange 9a in the liner plate 9 of the lower ring body 8, the bolts and the nuts are connected to each other so as to be stacked in the vertical direction.

  In the deadline construction method, as shown in FIG. 8, the operator places the reinforcing ring on the liner plate 9 of the lower ring body 8 on which the second layer buoyant ring body 7 b is to be constructed on the scaffold 5. 10 webs 11 are placed, and a longitudinal flange 9a in the liner plate 9 of the upper ring body 8 is placed on the web 11, and then connected to each other along the vertical direction by bolts and nuts. .

  As shown in FIG. 8, after the lower ring body 8 and the upper ring body 8 that constitute the second layer buoyancy ring body 7b are connected to each other through the reinforcing ring 10, the operator On the scaffold 5, two or a plurality of single floats 20 are attached to the reinforcing ring 10 mounted between the lower ring body 8 and the upper ring body 8. As a result, the lower ring body 8, the upper ring body 8, the reinforcing ring 10, and the two or more single floats 20 form a second layer buoyancy ring body 7 b. Connecting the first layer buoyancy ring body 7a and the second layer buoyancy ring body 7b so as to be stacked in the vertical direction corresponds to the third step (connection step) in the closing method of the present invention. .

  At this time, the first-layer buoyancy ring body 7a and the second-layer buoyancy ring body 7b are connected so as to be stacked in the vertical direction. The weight in water with respect to 4 is apparently almost zero due to the buoyancy of two or more single floats 20 (Archimedes principle). That is, only the weight of the second layer buoyancy ring 7 b is loaded on the lifting device 4.

  Further, in the deadline method, by repeating the second step and the third step, as shown in FIG. 9, the first layer buoyancy ring body 7a to the fourth layer buoyancy ring body 7d are connected to each other. Then, the lower ring body 8 which is the fifth layer (uppermost layer) is connected to the upper ring body 8 of the fourth layer buoyancy ring body 7d so as to be stacked, and the lower ring body 8 thereof. By connecting the upper ring body 8 to each other so as to be stacked, the final water blocking wall structure 70 is formed so as to surround the periphery of the pier 2 with a gap (third step).

  In this case, the first-layer buoyancy ring body 7a to the fourth-layer buoyancy ring body 7d are all connected below the lower ring body 8 serving as the fifth layer. The total weight applied to the lifting / lowering device 4 of the first-layer buoyancy ring body 7a to the fourth-layer buoyancy ring body 7d by the single float 20 is apparently zero. For this reason, only the weight of the two ring bodies 8 in the fifth layer is loaded on the elevating device 4, and no more weight is loaded.

  In the deadline construction method, the water blocking wall structure 70 formed in this way is submerged in the water by the elevating device 4, and watertightness is provided on the footing 1 at the bottom of the water by waterproofing concrete or the like by a diver. Install. Such installation of the water blocking wall structure 70 corresponds to the fourth step (water bottom portion installation step) in the deadline method of the present invention.

  Finally, in the deadline method, the water in the inner space of the water blocking wall structure 70 formed so as to surround the pier 2 with a gap is drained by a pump or the like, so that the dry driers around the pier 2 are dried. Provide a space workshop. Such drainage of water in the inner space of the water blocking wall structure 70 corresponds to the fifth step (drainage step) in the deadline method of the present invention.

  The water blocking wall structure 70 formed by such a closing method includes a plurality of ring bodies 8 having a shape in which a plurality of layers are vertically stacked in a state of being surrounded by an interval on the outer peripheral surface of the pier 2, and on the water surface. In order to reduce the weight with respect to the lifting device 4 of the plurality of ring bodies 8 that are sequentially lowered vertically below the scaffolding 5 via the lifting device 4 installed at any part of the bridge girder part 3 or the pier 2 positioned at The single float 20 installed in each of the plurality of ring bodies 8 is provided.

<Action and effect>
According to the closing method of the present invention, the buoyancy of the single float 20 installed in each of the ring bodies 7 a to 7 d with buoyancy in water exceeding the total weight of the two ring bodies 8 by the wire 4 a of the lifting device 4, The weight applied to the lifting device 4 of the buoyancy ring bodies 7a to 7d can be reduced, and the total weight of the buoyancy ring bodies 7a to 7d with respect to the lifting device 4 can be apparently zero.

  Thereby, on the scaffold 5 installed on the water, when an operator forms the ring bodies 7a-7d with buoyancy of the first layer to the fourth layer in order, the ring bodies 7a-7d with buoyancy are vertically lowered. Even when the water is sequentially lowered into the water, a load exceeding the weight of the two ring bodies 8 exposed from the water surface 6 is not applied to the lifting device 4. Thus, in the closing method according to the present invention, it is not necessary to prepare a large-scale lifting device 4 having a rated load more than the weight of the two ring bodies 8, and the existing lifting device 4 is used for long connection in the vertical direction. The water blocking wall structure 70 can be formed at low cost.

  Further, in this deadline method, all of the work of connecting the first to fourth layers of buoyant ring bodies 7a to 7d and the two ring bodies 8 of the fifth layer so as to be stacked in the vertical direction are all of the scaffold 5. Since the worker can perform the above, the underwater work by the diver can be significantly reduced as compared with the conventional case, and the workability of the water blocking wall structure 70 can be significantly improved.

  Furthermore, in this deadline method, the horizontal state of the buoyant ring bodies 7a to 7d is maintained in a well-balanced state in water by attaching a total of two or a plurality of single floats 20 at positions facing each other with respect to the reinforcing ring 10. The workability when the operator connects the ring bodies 8 in the horizontal direction and the vertical direction on the scaffold 5 can be improved.

  Furthermore, in this deadline construction method, when the two ring bodies 8 of the fifth layer in the uppermost layer of the water blocking wall structure 70 are disassembled and removed after the reinforcement and repair work of the pier 2 is completed, Since the single float 20 is attached to each of the fourth layer buoyancy ring bodies 7a to 7d, the lifting device 4 is not subjected to a load more than the weight of the two ring bodies 8 of the fifth layer. For this reason, the operator can easily carry out the disassembly work of the ring body 8 on the scaffold 5 on the water. Therefore, even during withdrawal, underwater work by divers can be greatly reduced, and workability can be significantly improved.

<Other embodiments>
In the above-described embodiment, the case where the single float 20 is installed in a state of being in close contact with the reinforcing ring 10 has been described. You may make it install 20 in the state spaced apart.

  In this case, as shown in FIGS. 10A to 10C, the reinforcing ring 10 is attached to the single float 20 attached to the through hole 12 uh provided in the upper vertical direction of the outer flange 12 out of the reinforcing ring 10 via the shackle 13. A rope 20 rs having a length enough to be separated may be used. By so doing, the float 20 can be floated in a state of being separated from the reinforcing ring 10, so that the swing of the water surface 6 is absorbed by the float float 20 and the swing of the water surface 6 reaches the buoyant ring bodies 7 a to 7 d. Can be prevented.

  In the above-described embodiment, the case where two or more single floats 20 are installed so as to face each other with respect to the reinforcing ring 10 has been described. However, the present invention is not limited to this. 11 (A) to 11 (C), a belt-like float 22 formed in a donut shape so as to be in close contact with the outer peripheral surface of the reinforcing ring 10 may be installed. In this case, if a plurality of ropes 22r provided so as to wind the belt-like float 22 are attached to the through holes 12uh or 12dh provided in the upper stage or the lower stage in the vertical direction of the outer flange 12out of the reinforcing ring 10 via the shackle 13 Good.

DESCRIPTION OF SYMBOLS 1 Footing 2 Bridge pier 3 Bridge girder part 4 Lifting device 4a Wire 5 Scaffold 6 Water surface 7 Buoyant ring body 8 Ring body 9 Liner plate 10 Reinforcement ring 11 Web 12out Outer flange 12in Inner flange 13 Shackle 20 Single float 22 Strip-like float

Claims (4)

A ring wall is formed so as to surround at least a part of the submerged structure with a space therebetween, and a water blocking wall structure is formed, and water inside the water blocking wall structure is discharged to form a work place. A deadline construction method,
A lifting device is installed on the portion of the structure located on the water surface, and a scaffold having an outer diameter smaller than the inner diameter of the water blocking wall structure is installed on the outer surface of the structure between the lifting device and the water surface. The first step;
A second step of lowering the buoyancy ring body provided on the ring body by a lifting device for reducing the weight of the ring body relative to the lifting device, vertically below the scaffold by the lifting device;
The water stop by connecting another ring body or another buoyancy ring body in a vertical direction to the upper end exposed from the water surface of the buoyancy ring body lowered below the scaffold vertically. A third step of forming a wall structure;
A fourth step of immersing the water blocking wall structure in water and installing it on the bottom of the water;
And a fifth step of discharging water inside the water blocking wall structure installed at the bottom of the water. 2. The second step includes a buoyancy ring body forming step of forming the buoyancy ring body by attaching the buoyancy body to the ring body via a predetermined reinforcing ring. Deadline construction method. In the second step, the ring body with buoyancy that is set so that a ratio of a force that sinks in water of a ring body in which the buoyancy body is not installed and a buoyancy of the buoyancy body is larger than 1. The deadline method according to claim 1 or 2, characterized in that: A water blocking wall structure that discharges water in a space formed by surrounding a structure that is at least partially submerged via a space and provides a work place,
In order to form the water blocking wall structure, a plurality of ring bodies having a shape stacked vertically in a state of being surrounded by a space around the structure,
From a scaffold with an outer diameter smaller than the inner diameter of the water blocking wall structure on the outer surface of the structure between the lifting device and the water surface via a lifting device installed on the structure portion located on the water surface In order to reduce the weight of the plurality of ring bodies that are sequentially lowered downward in the vertical direction with respect to the lifting device, buoyancy bodies installed respectively on the plurality of ring bodies are provided. .

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