JP5942342B2 - Reinforcement structure of existing structures - Google Patents

Description

The present invention relates to reinforcing structure of the existing structures, particularly, it relates to good reinforcement technical working efficiency is unnecessary welding operation.

  There is a need to reinforce existing structures such as existing pile vent piers with the aim of improving seismic resistance in response to revision of the specifications. The following methods have been proposed as conventional methods that meet such reinforcement needs.

  For example, under the problem of providing a reinforcement method for a single-column foundation used for pile-type piers (pile vent piers) etc., it is constructed with multiple segment pieces and all or part of the ground around the single-column foundation A single column foundation reinforcing method (Patent Document 1) has been proposed, in which a sinking body into which is inserted is used as a prototype of a stiffening body that increases the bending rigidity of the single column foundation.

  In addition, under the problem of providing a method to reinforce the outer periphery of the existing pile by pressing the outer winding steel pipe into the ground without excavating the surrounding ground to the depth required to reinforce the existing pile, In the method of reinforcing an existing pile by winding an outer wound steel pipe around the outer periphery of the existing pile of a supported structure, excavating the ground to form a work space to the extent that the head of the existing pile is exposed. Winding the outer wound steel pipe unit around the outer periphery of the pile head in space, and press-fitting the outer wound steel pipe unit into the ground along the existing pile by a press-fitting device installed on the bottom bottom surface of the structure; A stage in which a next higher-order outer-wound steel pipe unit is wound around the outer periphery of the pile head, joined to the lower-side outer-wound steel pipe unit press-fitted into the ground, and the next higher-order outer-wound steel pipe unit is press-fitted into the ground by a press-fitting device And the outer steel pipe unit Repeating external winding around the outer periphery of the pile head and press-fitting into the ground, winding the area to be reinforced of the existing pile with an externally wound steel pipe completed by multiple externally wound steel pipe units, A method for reinforcing an existing pile by press-fitting an externally wound steel pipe, characterized in that it comprises a step of filling with a filler after removing the earth and sand in the gap between and a step of refilling the work space after completion of reinforcement (Patent Document 2) Proposed.

JP-A-11-152746 JP-A-10-131176

  When a method is adopted in which a reinforcing member having a larger diameter (such as a steel pipe) is wound around the outer periphery of an existing pile and is sequentially press-fitted into the ground while being joined together, welding work between the reinforcing members occurs. Since this welding operation occurs every time the reinforcing member is wound up, it is necessary to arrange a welder and to spend a lot of work time. In addition, whether or not the welding operation can be performed is easily affected by the weather, and there are many adverse effects on the process when the weather is bad. Furthermore, since the quality of the welding result varies depending on the skill level of the welder, it is necessary to pay attention to quality control. In addition, when the flange portions and tabs of each reinforcing member are connected to each other by bolting or the like, protrusions are formed on the inner and outer circumferences of the reinforcing member by such a bolt fastening structure, which tends to become resistance during press-fitting of the ground, and there is no filler. There is concern over the occurrence of filling points.

  Then, this invention aims at provision of the reinforcement technique of the existing structure which does not require welding work and has favorable working efficiency.

The reinforcing structure for an existing structure according to the present invention that solves the above-described problems comprises a plurality of reinforcing members that are connected to each other in the circumferential direction of the existing structure so as to surround the periphery of the pile, column, or beam that is the existing structure. A reinforcing ring, and a solidified material that is filled and solidified between the existing structure and the reinforcing ring, and each reinforcing member forming the reinforcing ring has another structure adjacent to the circumferential direction. The joint surface with the reinforcing member includes a plurality of convex portions that are wider toward the outer side, and a concave portion that is wider toward the inner side between the convex portions, and the reinforcing ring is formed of one reinforcing member. The convex portion is fitted into the concave portions of the other reinforcing members adjacent in the circumferential direction, and the reinforcing members are connected to each other to form an annular shape, which is separated from the existing structure and surrounds the outer periphery thereof. Ri, the outer side of the reinforcing ring, the engagement portion between the convex portion and the concave portion of one another It is filled and solidified between the other reinforcing rings installed in a spiral arrangement, a predetermined restraint material that constrains the space between each reinforcing ring, and the existing structure and the inner reinforcing ring among the reinforcing rings. And a solidifying material.

  If such a structure is adopted, welding work is not required for connecting the reinforcing members surrounding the existing structure, and a skilled welder and a great amount of work time are not required. In addition, it is possible to perform the work stably without depending on the weather whether or not the work can be performed like the welding work. Furthermore, since a special skill level is not required for the simple work of fitting the reinforcing members together, there is little risk of differences in work quality between workers. In addition, large protrusions do not occur on the inner and outer peripheries of the connected reinforcing members, and smooth ground press-fitting is possible. Therefore, it is possible to provide a reinforcing technique for an existing structure that does not require welding work and has good work efficiency.

Further, on the outer layer side of the reinforcing ring, other reinforcing rings installed in an arrangement that shifts the fitting portions of the convex portions and the concave portions, and a predetermined restraining material that integrally restrains between the reinforcing rings, the existing structures and filled solidified solidifying material and the including between the inner reinforcing ring of the reinforcing ring.

  According to this, the thickness formed by the reinforcing ring is doubled, and the reinforcing effect is further enhanced. Further, it is possible to more reliably maintain the connection between the inner layer side and outer layer side reinforcing members forming the reinforcing ring against the force of expanding the reinforcing ring outward due to the filling of the solidifying material. Further, even if the reinforcing member forming one reinforcing ring tries to be separated at the fitting portion by the force to expand the reinforcing ring outward due to the filling of the solidifying material, the other reinforcement that is constrained integrally The reinforcing member of the ring abuts on the fitting portion to suppress the discreteness. Accordingly, the reinforcing rings having a two-layer structure can maintain the structure of each other, and the reinforcing effect is further enhanced.

Further, the reinforcing structure of the existing structure according to the present invention includes a reinforcing ring composed of a plurality of reinforcing members connected to each other in the circumferential direction of the existing structure so as to surround the periphery of the pile, column, or beam that is the existing structure. The solidified material filled and solidified between the existing structure and the reinforcing ring, and each reinforcing member forming the reinforcing ring is connected to another reinforcing member adjacent in the circumferential direction. A plurality of convex portions that are wider toward the outer side and a concave portion that is wider toward the inner side between the convex portions, and the reinforcing ring is a convex portion of one reinforcing member. However, it is fitted into the concave portions of the other reinforcing members adjacent in the circumferential direction, and the reinforcing members are connected to each other to form an annular shape, which is separated from the existing structure and surrounds the outer periphery thereof. A plurality of the reinforcing rings connected to each other along the extending direction of the object, The reinforcing ring further includes a plurality of convex portions that are wider toward the outer side or a concave portion that is wider toward the inner side at the joint surface between the reinforcing rings, and the convex portion and the concave portion at the joint surface. One of the plurality of reinforcing members is provided on each reinforcing member that forms the reinforcing ring, and the other is provided so as to straddle between adjacent reinforcing members that form the reinforcing ring. A solid-shaped solidified material filled between the connected reinforcing ring and the existing structure is solidified by fitting the recessed portions in the other adjacent reinforcing rings and connecting the reinforcing rings to each other. It is characterized by including . According to this, it is possible to reinforce a long existing structure without welding and with good work efficiency.

  Further, in the reinforcing structure of the existing structure, the plurality of connected reinforcing rings may be a structure arranged along the extending direction of the existing structure in the ground. According to this, it is possible to reinforce a long existing structure in the soil without welding and having good work efficiency.

  According to the present invention, it is possible to provide a technique for reinforcing an existing structure that does not require welding work and has good work efficiency.

It is a figure which shows the example of the whole process of the reinforcement construction method of the existing structure in this embodiment. It is a figure which shows the procedure example 1 of the reinforcement construction method of the existing structure in this embodiment. It is a figure which shows the procedure example 2 of the reinforcement construction method of the existing structure in this embodiment. It is a figure which shows the procedure example 3 of the reinforcement construction method of the existing structure in this embodiment. It is a figure which shows the procedure example 4 of the reinforcement construction method of the existing structure in this embodiment. It is a figure which shows the example of the reinforcement construction method of the existing structure in other embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of the entire process of a reinforcement method for an existing structure in the present embodiment. In this embodiment, the pile 10 which makes a pile vent pier is mention | raise | lifted as an example of the existing structure to which a reinforcement construction method is applied. The pile vent pier has a structure in which the foundation pile is raised as it is from the ground surface to a predetermined height, and the head is connected by a horizontal beam such as reinforced concrete. Such a structure eliminates the need for temporary work such as a watertight deadline, so it is excellent in work efficiency and has been widely used so far. However, the response displacement at the time of an earthquake is large and seismic reinforcement is often required. Therefore, it was set as the reinforcement object in this embodiment. However, the application target of the present invention is not limited to piles of pile bent piers, and can be applied to any of rod-like members such as columns and beams in addition to existing piles.

  First, the whole process of the reinforcement method of the existing structure of this embodiment is demonstrated. The pile 10 is placed on the ground 5, and a bridge girder 13 is placed on the pile head 11 via a shoe 12 or the like. In this case, first, the steel plate 2 provided with the rib 1 is wound up and fixed to the pile head 11 (procedure 1). The rib 1 of the steel plate 2 becomes a reaction force fulcrum of the press-fitting device 20 such as a jack for press-fitting the reinforcing member 30 into the ground 5. Next, a fulcrum is placed on the rib 1 and the press-fitting device 20 is installed so as to grip the pile 10 (procedure 2).

  After the press-fitting device 20 is installed, the reinforcing member 30 is installed in a space below the press-fitting device 20 (procedure 3). The reinforcing member 30 in the present embodiment has a structure in which reinforcing members are connected to each other in the circumferential direction on the outer periphery of the pile 10 to be reinforced. That is, the joint surface between the reinforcing members is a member provided with a plurality of convex portions that are wider toward the outer side and concave portions that are wider toward the inner side between the convex portions, and is a steel plate having an arc-shaped cross section. The plurality of reinforcing members 30 having such a structure are connected to each other by fitting the convex portions of one reinforcing member 30 to the concave portions of the other reinforcing member 30, and separated from the peripheral surface of the pile 10 by a certain distance. The outer periphery of the pile 10 is surrounded. Details of the installation work of the reinforcing member 30 will be described later.

  Through the procedure 3, a reinforcing member group (hereinafter referred to as a reinforcing ring 40) surrounding the outer periphery of the pile 10 is configured in the lower space of the press-fitting device 20. Next, the press-fitting device 20 obtains a reaction force fulcrum on the rib 1 and press-fits the reinforcing ring 40 toward the ground 5 (procedure 4). The press-fitting device 20 extends a cylinder 21 that expands and contracts by obtaining a driving force from a predetermined hydraulic device, presses the reinforcing ring 40 to a predetermined depth of the ground 5, and then contracts the cylinder 21 to thereby reinforce the reinforcing member. The area | region for connecting 30 and comprising the reinforcement ring 40 is ensured.

  After press-fitting one reinforcing ring 40 into the ground 5, in the lower space of the press-fitting device 20, a convex portion or a concave portion provided at the upper end of the press-fitted reinforcing ring 40 (similar to those provided on the joint surface) ), A concave portion or a convex portion provided at the lower end portion of the other reinforcing member 30 is fitted and a new reinforcing ring 50 is added, and the press-fit reinforcing ring 40 together with the new reinforcing ring 50 is further added to the ground 5. (Procedure 5). In addition, until the reinforcement ring 40 reaches | attains the depth calculated beforehand regarding the reinforcement of the pile 10, the addition work and press-fitting work of the reinforcement ring of the said procedure 6 are performed repeatedly.

  If the reinforcement ring 40 is connected and installed around the pile 10 by a required length, for example, pressurized water is sprayed between the circumferential surface of the pile 10 and the reinforcement ring 40 surrounding the pile 10 to remove earth and sand. (Procedure 6). In addition, the solidified material 3 such as mortar is filled into the space left after the earth and sand are removed by the procedure 7, that is, the space between the peripheral surface of the pile 10 and the reinforcing ring 40 surrounding the pile 10 (procedure 7). ). The pile 10 and the reinforcing ring 40 are united by the solidifying material 3, and the pile 10 is substantially enlarged in diameter and improved in strength. In this way, a reinforcing structure including the reinforcing rings 40 and 50 and the solidified solidified material 3 is configured.

  In the above, after the reinforcement ring 40 is connected and installed all the necessary length around the pile 10, the earth and sand between the peripheral surface of the pile 10 and the reinforcement ring 40 is removed, and the remaining space is left. Although the solidification material 3 is filled, for example, the earth and sand may be removed in parallel with pressing one set of the reinforcing ring 40 and the reinforcing ring 50 into the ground 5 or each time the one set is pressed. Good.

  Next, a procedure for sequentially configuring the reinforcing ring 40 by connecting the reinforcing members 30 to each other will be described. 2 shows a procedure example 1 of a reinforcing method for an existing structure in the present embodiment, FIG. 3 shows a procedure example 2 of a reinforcing method for an existing structure in the present embodiment, and FIG. 4 shows a reinforcement of the existing structure in the present embodiment. It is a figure which shows the procedure example 3 of a construction method, respectively.

  Here, a case where the reinforcing ring 40 is provided in two layers on the inner layer side and the outer layer side will be described. The reinforcing member 30 includes a plurality of convex portions 31 that are wider toward the outer side and a concave portion that is wider toward the inner side between the convex portions 31 on the joint surface with the other reinforcing member 30 that constitutes the same reinforcing ring. 32 is provided. As shown in the procedure A of FIG. 2, at a position separated from the pile 10 by a certain distance d, the reinforcing members 30 having an arcuate cross section are fitted and connected to each other with the unevenness of the joint surface, and an annular shape surrounding the pile 10 is obtained. A reinforcing ring 40 (inner layer side reinforcing ring) is formed. Such connection between the reinforcing members is performed by fitting the convex portion 31 of one reinforcing member 30 to the concave portion 32 of the other reinforcing member 30. The convex portion 31 has a shape that becomes wider toward the outer side, and the concave portion 32 has a shape that becomes wider toward the inner side corresponding to the shape of the convex portion 31 and meshes with each other. The connection is not released even if a force in a direction away from each other acts.

  If the outer periphery of the pile 10 is first surrounded by the inner reinforcement ring 40, then the outer reinforcement ring 50 is further formed on the outer periphery of the reinforcement ring 40 (procedure B). In this case, the reinforcing member 30 of the reinforcing ring 50 is disposed at a position in the reinforcing ring 40 that straddles the fitting portion 30 a (which can be said to be the joint surface) between the convex portion 31 and the concave portion 32. Further, the reinforcing ring 50 and the reinforcing ring 40 are integrally fastened by a bolt 8 (restraint material) penetrating both (procedure C). When fastening the reinforcing rings 40, 50 with the bolts 8, the bolts 8 are penetrated by avoiding the joints so that the bolt penetration positions do not hit the joints (fitting parts) of the reinforcing members 30 in the respective reinforcing rings 40, 50. It shall be concluded.

  The outer layer-side reinforcing ring 50 is formed below the upper end of the inner layer-side reinforcing ring 40 by a predetermined distance c. In this way, when the next stage of the reinforcing ring is added to the upper end of the reinforcing ring 40 (pressed into the ground), the convex part 45 or the concave part 46 at the upper end is exposed, The connection with the lower end of the next-stage reinforcing member 30 can be reliably performed.

  Subsequently, as shown in FIG. 3, the double reinforcing rings 40 and 50 integrally formed by the above procedure are press-fitted into the ground 5 along the extending direction of the pile 10 by the press-fitting device 20 ( Procedure D). Note that it is preferable that the lower end portions of the reinforcing rings 40 and 50 that are press-fitted here do not include the convex portion 45 or the concave portion 46 like the other reinforcing members 30. This is because the lower end portion of the reinforcing ring 40 is considered to be a tip that is press-fitted into the ground, so that it is difficult to deform during press-fitting.

  Of the reinforcing rings 40 and 50 that are press-fitted here, with respect to the convex portion 45 or the concave portion 46 provided at the upper end portion of the reinforcing member 30 constituting the inner-layer side reinforcing ring 40 (that is, the joint surface between the reinforcing rings). Then, the concave portion 32 or the convex portion 31 provided on the lower end portion (joint surface between the reinforcing rings) of the new reinforcing member 30 is fitted (procedure E), and an operation of adding the reinforcing ring 60 on the inner layer side is executed. (Procedure F, Procedure G).

  Further, as shown in FIG. 4, a new reinforcement is provided for the convex portion 45 to the concave portion 46 provided at the upper end portion of the reinforcing member 30 constituting the reinforcing ring 50 on the outer layer side among the reinforcing rings 40 and 50. The concave portion 32 or the convex portion 31 provided at the lower end portion of the member 30 is fitted (procedure H), and an operation of adding the reinforcing ring 70 on the outer layer side is executed (procedure I, procedure J).

  After repeating the connection and press-fitting of the reinforcing member 30 as necessary, as shown in FIG. 5, the high pressure water 9 is applied to the earth and sand 6 between the outer peripheral surface of the pile 10 and the inner peripheral surfaces of the reinforcing rings 40 and 60. Is made into muddy water, and this is pumped out by a muddy water pump (procedure K, procedure L). The region between the outer peripheral surface of the pile 10 and the inner peripheral surface of the reinforcing rings 40 and 60 from which the earth and sand 6 has been removed is filled with the solidifying material 3 such as non-shrink mortar, and the pile 10 and the reinforcing rings 40 and 50 are filled. , 60 and 70 (procedure M). In addition, as illustrated in FIG. 5, it is preferable to install an appropriate spacer 90 so that the pile 10 and the reinforcing rings 40 and 60 are separated from each other by a certain distance.

  Apart from the above-described embodiment, the reinforcing member 30 may be connected in a form as shown in FIG. In the example shown in FIG. 6, a reinforcing member 35 having an L-shaped cross section and an I-shaped reinforcing member 36 are connected to form a rectangular reinforcing ring. In the upper example, the inner layer-side reinforcing ring 80 is configured by a total of eight reinforcing members including four L-shaped reinforcing members 35 and four I-shaped reinforcing members 36, and the outer-layer-side reinforcing ring 81 is divided into four A total of six reinforcing members, that is, an L-shaped reinforcing member 35 and two I-shaped reinforcing members 36 are formed.

  Further, in the lower example, the inner layer side reinforcing ring 80 is constituted by a total of four reinforcing members of two U-shaped reinforcing members 37 and two I-shaped reinforcing members 36, and the outer layer side reinforcing ring 81 is formed. The four U-shaped reinforcing members 37 and the two I-shaped reinforcing members 36 are composed of a total of four reinforcing members. Even in this case, the reinforcing members are similarly connected to each other with the convex portion 31 and the concave portion 32 described above. Further, the press-fitting work and the adding work are performed in the same manner as in the above-described embodiment.

  As described above, according to the present embodiment, it is possible to provide an existing pile reinforcing technique that does not require welding work and has good work efficiency.

  As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary.

1 Rib 2 Steel plate 3 Solidified material 5 Ground 6 Earth and sand 8 Bolt 10 Pile (existing structure)
11 Pile head 12 Shoe 13 Bridge girder 20 Press fitting device 21 Cylinder 30 Reinforcement member 30a Fitting part 31 Convex part 32 Concave part 35 L-shaped reinforcement member 36 I-shaped reinforcement member 37 U-shaped reinforcement members 40-81 Reinforcing ring 45 Convex part 46 Concave part 90 Spacer

Claims (3)

In order to surround a pile, a pillar, or a beam, which is an existing structure, a reinforcing ring composed of a plurality of reinforcing members connected to each other in the circumferential direction of the existing structure, and between the existing structure and the reinforcing ring A structure composed of a solidified material that is filled and solidified,
Each reinforcing member forming the reinforcing ring has a plurality of convex portions that are wider toward the outer side and a concave portion that is wider toward the inner side between the convex portions at the joint surface with the other reinforcing member adjacent in the circumferential direction. And comprising
The reinforcing ring has an annular shape when a convex portion of one reinforcing member is fitted into a concave portion of another reinforcing member adjacent in the circumferential direction and the reinforcing members are connected to each other. all SANYO spaced apart to surround the outer periphery thereof,
On the outer layer side of the reinforcing ring, other reinforcing rings installed in an arrangement that shifts the fitting portions of the convex part and the concave part, and a predetermined restraining material that integrally restrains between the reinforcing rings,
Solidified material filled and solidified between the existing structure and the inner reinforcing ring among the reinforcing rings,
A reinforcing structure for an existing structure characterized by comprising: In order to surround a pile, a pillar, or a beam, which is an existing structure, a reinforcing ring composed of a plurality of reinforcing members connected to each other in the circumferential direction of the existing structure, and between the existing structure and the reinforcing ring A structure composed of a solidified material that is filled and solidified,
Each reinforcing member forming the reinforcing ring has a plurality of convex portions that are wider toward the outer side and a concave portion that is wider toward the inner side between the convex portions at the joint surface with the other reinforcing member adjacent in the circumferential direction. And comprising
The reinforcing ring has an annular shape when a convex portion of one reinforcing member is fitted into a concave portion of another reinforcing member adjacent in the circumferential direction and the reinforcing members are connected to each other. all SANYO spaced apart to surround the outer periphery thereof,
A plurality of the reinforcing rings connected to each other along the extending direction of the existing structure,
The reinforcing ring further includes a plurality of convex portions that are wider toward the outer side or a concave portion that is wider toward the inner side at the joint surface between the reinforcing rings,
One of the convex part and the concave part on the joint surface is provided in each reinforcing member forming the reinforcing ring, and the other is provided to straddle between adjacent reinforcing members forming the reinforcing ring,
The plurality of connected reinforcing rings are such that the convex portions in one reinforcing ring are fitted into the concave portions in other adjacent reinforcing rings and the reinforcing rings are connected to each other,
A reinforcing structure for an existing structure , comprising a solidified material that is filled and solidified between the connected reinforcing ring and the existing structure. The reinforcing structure for an existing structure according to claim 2 , wherein the plurality of connected reinforcing rings are arranged along the extending direction of the existing structure in the ground.