JP2014148811A - Lateral frame structure and reinforcing member installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method for beams or girders of a new RC viaduct, by which a process for filling a clearance between a reinforcement object portion and a reinforcing member with a binding material can be simplified.SOLUTION: A reinforcing member 21 with a U-shaped cross-section is applied to a vertical beam 6 to be reinforced, and through bolts 25 are penetrated through both side parts of the reinforcing member and the vertical beam 6 and they are connected together. A clearance between the reinforcing member 21 and the vertical beam 6 (a side clearance D1, a bottom clearance D2, a bolt outer periphery clearance D3) is filled with grout as a binding material and thus a grout layer 28 is formed. The quality of material of the grout, the side clearance D1, the bottom clearance D2, the bolt outer periphery clearance D3, that is, a diameter of a through-hole 6h for the through bolt 25 are set such that: before the grout made to flow down from the side of one side portion of the side clearance D1 passes through the bottom clearance D2, rotates around to the side of the other side portion, and reaches an opening of the side of the other side portion of the through-hole 6h, the grout having passed through the through-hole 6h flows out from an opening of the side of the other side portion.

Description

  TECHNICAL FIELD The present invention relates to a horizontal structure of a reinforced concrete structure viaduct.

  Existing RC (Reinforced Concrete) viaducts are appropriately repaired and reinforced. For example, with regard to reinforcement, cover three surfaces of a pier with a reinforcing steel plate, and connect and fix with a PC steel bar that penetrates the bridge steel column through the opposite part across the pillar of the reinforcing steel plate, and the gap between the steel plate and the column and PC steel. There is a known method of integrating a steel plate, a column, and a PC steel rod by filling the gap between the rod and the column with a filler (see, for example, Patent Document 1).

JP 2008-196288 A

  The construction method of Patent Document 1 is divided into a step of filling a filler between a steel plate and a column and a step of filling a filler between a PC steel rod and a column. It took extra man-hours.

  An object of this invention is to implement | achieve the reinforcement construction method for the beam of a new RC viaduct or a girder which can simplify the process of filling a binder into the clearance gap between a reinforcement object site | part and a reinforcement member.

  A first invention for solving the above-described problems is directed to a reinforced concrete structure viaduct beam or girder (hereinafter referred to as “target horizontal portion”), and a U-shaped reinforcing member is assigned to the reinforcing member. A horizontal part structure in which a through bolt is passed through both side parts and the target horizontal part, and a gap between the reinforcing member and the target horizontal part is filled with a binder, and one side of the reinforcing member The gap is provided between each of the upper part, the bottom part, and the other side part, and the target horizontal part, and the bonding material that has flowed down from one side part of the gap passes through the bottom part side to the other side part side. Before reaching the opening on the other side of the through hole of the target horizontal part through which the through bolt penetrates, so that it flows out from the opening on the other side through the through hole. In addition, a horizontal portion in which the material of the binding material, the gap interval and the diameter of the through hole are defined It is an elephant.

  According to the first invention, the reinforcing member is assigned to the target horizontal portion that is the reinforcement target portion and connected by penetrating the through bolt, and the through bolt and the target horizontal portion are also connected without a gap. By filling the material, the reinforcing member can be fixed to the target horizontal portion. In addition, the gaps on one side, bottom and other sides of the reinforcing member are connected to the through hole of the target horizontal part through which the penetration bolt passes, and the gap between the reinforcing member and the reinforcing member is filled with the binder. For example, since the binding material is distributed to the through hole of the target horizontal portion, the process related to filling can be simplified. Furthermore, before the binding material that has passed through the gap on the other side through the gap at the bottom reaches the opening on the other side of the through hole, the binding material that has passed through the through hole is on the other side. Since it sets so that it may flow out from an opening part, the air in the through-hole of an object horizontal part is easy to escape, and it is hard to produce an unfilled part and can implement | achieve the high filling degree.

  2nd invention is the horizontal part structure of 1st invention by which the said coupling material was filled into the said clearance gap by the one push from the said one side part side, and natural flow.

  According to the second invention, the same effect as the first invention can be obtained. In addition, the filling of the binding material can be done by pushing from one side, and it can be naturally flowed, so even if a device that pumps the binding material to a high place is necessary, a device that applies filling pressure is used. You don't have to. The site construction process is simplified, and the construction period can be shortened and the cost can be reduced. In particular, in the case of a railway overpass, shortening the construction period is a great merit because the construction must be completed in a short time during the night when the railway operation is suspended.

  According to a third aspect of the present invention, the binder that has flowed down from one side of the gap flows out from the opening on the other side through the through hole, and passes through the bottom side to the other side. It is the horizontal part structure of the 1st or 2nd invention in which the material of the said binding material, the space | interval of the said clearance gap, and the diameter of the said through-hole were defined so that it might go around to the side.

  According to the third aspect, the same effect as in the first or second aspect can be obtained. In addition, it is possible to prevent the unfilled portion of the binder from occurring in the gap on the bottom side.

  4th invention is the horizontal part structure of the invention in any one of 1st-3rd in which the difference of the diameter of the said through-hole was larger than the said clearance gap.

  According to the fourth aspect, the same effect as any of the first to third aspects can be obtained. In addition, since it becomes easy for the binding material to pass through the through-hole, generation of an unfilled portion can be effectively suppressed.

  More specifically, as a fifth invention, the horizontal portion structure according to any one of the first to fourth inventions, wherein the through hole is defined to have a diameter that is at least 30 mm larger than the diameter of the through bolt. Can be configured.

In addition, regarding the fluidity of the binding material, if the fluidity is too high, the timing when the binding material wrapping around to the other side through the gap at the bottom reaches the opening on the other side of the through hole, The timing at which the material enters the through-hole from one side, passes through the through-hole, and flows out from the opening on the other side is substantially the same, which increases the possibility that an unfilled portion is generated in the through-hole. On the other hand, if the fluidity is too low, it takes time to fill, which is not preferable.
Therefore, as a sixth aspect of the invention, it is more preferable that the binding material comprises a horizontal part structure according to any one of the first to fifth aspects of the invention in which the J14 funnel flow time is 6 seconds or longer and 10 seconds or shorter. It is.

  Further, if the viewpoint is shifted to the construction method, as a seventh invention, an opening step for providing a through hole for penetrating a through bolt in a target horizontal part of the reinforced concrete structure viaduct, and a U-shaped cross section in the target horizontal part A temporary disposing step for covering the reinforcing member, a bolt installing step for penetrating a through bolt into the through hole of the both side portions of the reinforcing member and the target horizontal portion, one side portion, the bottom portion, and others of the reinforcing member A filling step of filling the gap between each side part and the target lateral part with a predetermined fluidity from one side by a one-push method, and filling the gap between the gap and the penetration The diameter of the hole is before the binding material that has flowed down from one side of the gap passes through the bottom side to the other side and reaches the opening on the other side of the through hole. And flow from the opening on the other side through the through hole. To so provide, it is possible to constitute a reinforcing member installation method. According to the seventh aspect, the same effect as in the first aspect can be obtained.

The figure for demonstrating the outline of the construction of 1st Embodiment. The partial perspective view of RC viaduct which shows the structural example of the horizontal part structure of 1st Embodiment. The longitudinal cross-sectional view of RC viaduct which shows the structural example of the horizontal part structure of 1st Embodiment. The figure which shows the structural example of the penetration bolt and fastener of 1st Embodiment. The figure which shows the structural example of the hardware of a design support apparatus. The functional block diagram which shows the function structural example of a design support apparatus. The figure which shows an example of a data structure of arrangement | positioning structure data. The figure which shows an example of the data structure of bolt specification data. The flowchart for demonstrating the flow of a process of a design support apparatus. The figure which shows the example of the rotation center distance from a rotation center to a penetration bolt. The flowchart for demonstrating a construction order. The figure for demonstrating the filling process of a binding material. The figure for demonstrating the filling process of a binding material. The figure for demonstrating a loading experiment and an experimental result. The figure for demonstrating a loading experiment and an experimental result. The longitudinal cross-sectional view of RC viaduct which shows the structural example of the horizontal part structure of 2nd Embodiment. The figure which shows the structural example of the fastener of 2nd Embodiment.

[First Embodiment]
As a first embodiment to which the present invention is applied, a pair of adjacent existing columns (columns at both ends between the spans) are replaced with new ones while reinforcing horizontal bridges such as RC viaduct beams and girders for railways. An example is construction that expands the span by replacing it with a pillar of a book. In addition, RC viaduct is applicable not only for railways but also for roads. Moreover, it is applicable not only to the replacement of pillars but also to the addition of pillars.

FIG. 1 is a diagram for explaining an outline of construction in the present embodiment.
As shown in FIG. 1 (1), the RC viaduct 2 for railway assumed as a construction target supports a substrate 10 by connecting a plurality of columns 4 with vertical beams 6 and horizontal beams 8. Various facilities such as a railroad track 12, a soundproof fence 14, and a signal (not shown) are appropriately installed on the upper surface of the substrate 10.

  In the present embodiment, as shown in FIG. 1 (2), the vertical distance between the pillar 4 between the first compartment and the second compartment and the pillar 4 between the second compartment and the third compartment. The beam 6 is used as a target horizontal part to be reinforced, and a viaduct pillar 22 that integrally supports the reinforcing member 21 is installed while the target horizontal part is reinforced by the reinforcing member 21. And as shown in FIG.1 (3), the pillar 4 between a 1st division and a 2nd division and the pillar 4 between a 2nd division and a 3rd division are removed, and 1st-1st Renew 3 sections into 2 sections, A section and B section. Note that it may be either whether the reinforcing member 21 is first attached to the target horizontal portion and the viaduct pillar 22 is installed later, or the viaduct pillar 22 is installed first and the reinforcing member 21 is installed later.

[Description of the structure of the target horizontal part after reinforcement]
FIG. 2 is a partial perspective view showing a configuration example of the horizontal structure of the RC viaduct 2 in the present embodiment, and corresponds to a view in which the lower surface of the substrate 10 is looked up obliquely from below. FIG. 3 is a longitudinal sectional view of the same. As shown in these drawings, the horizontal structure 20 after reinforcement of the present embodiment is
(1) a reinforcing member 21 that wraps the longitudinal beam 6 that is a target horizontal portion;
(2) viaduct pillar 22 rigidly connected to the bottom of the member;
(3) the foundation 24 (FIG. 1) that supports the pillar;
(4) a through bolt 25 penetrating the vertical beam 6;
(5) a fastener 26 that is screwed to the through-bolt and is fitted to the reinforcing member 21;
(6) a packing material 27 that closes a gap between side ends of the longitudinal beam 6 and the reinforcing member 21;
(7) A gap between the vertical beam 6 and the reinforcing member 21 and a grout layer 28 filled between the vertical beam 6 and the through bolt 25 are provided.
Note that the number and arrangement position of the through bolts 25 are not limited to the example in the figure, and are appropriately set according to the dimensions of the vertical beam 6 and the length of the reinforcing member 21.

The reinforcing member 21 is a member having a U-shaped cross section that reinforces the longitudinal beam 6 across the diameter of the column 4 to be removed, and is placed so as to cover the outside of the longitudinal beam 6 to be reinforced.
The reinforcing member 21 is made of steel made of, for example, a steel plate. Specifically, both sides and the bottom are prepared separately, and the steel plates are welded and assembled on site. Alternatively, it may be assembled in advance and fitted from below the target longitudinal beam 6 at the site. In addition, the outer peripheral part of the reinforcing member 21 can be appropriately provided with a rib for ensuring the strength. Therefore, the shape of the reinforcing member 21 can be expressed as a “U shape” that is open upwards when viewed without including a rib or the like.

  The “U shape” mentioned here means a shape that covers the protruding surface of the longitudinal beam 6 to be reinforced, and is not limited to the shape of the alphabet letter “U” itself, but is to be reinforced. This means that the degree of freedom according to the cross-sectional shape of the vertical beam 6 is included. For example, the portions corresponding to the left and right of “U” are not limited to straight lines, and may be arcuate. In that case, it can be said that the cross section is C-shaped. Further, it is of course possible that the connection portion between the portion corresponding to the left and right of “U” and the base portion is a right angle, for example, the opening of the “K” in Katakana is directed upward.

  The inner dimension of the reinforcing member 21 is set so as to have a side gap D1 and a bottom gap D2 determined according to the flowability of the grout from the side and bottom surfaces of the longitudinal beam 6 to be reinforced. For example, a grout having a flowability of 6 to 10 seconds according to the “J14 funnel test” is used, and the side gap D1 and the bottom gap D2 are approximately 20 mm.

  The viaduct pillar 22 is formed of, for example, CFT (Concrete Filled Steel Tube). In this embodiment, the reinforcing member 21 and the viaduct pillar 22 are rigidly connected. A coupling structure in which a connecting portion 23 (supporting portion) is appropriately provided between the reinforcing member 21 and the viaduct pillar 22 may be employed.

FIG. 4 is a diagram illustrating a configuration example of the through bolt 25 and the fastener 26.
The through bolt 25 is formed by forming male screw portions 25a at both ends of a PC steel rod, for example. In the specification of this embodiment, the diameter is, for example, 11 mm. A lateral through hole 21h and a through hole 6h are respectively provided in the side portion of the reinforcing member 21 and the longitudinal beam 6 to be reinforced, and the through bolt 25 is inserted into both through holes (FIG. 3).

  The diameter of the through hole 6h of the vertical beam 6 is set so as to have a bolt outer peripheral gap D3 determined according to the flowability of the grout between the through bolt 25 and the through bolt 25. When the longitudinal beam 6 to be reinforced has a dimension as described above and a grout having a flowability of 6 to 10 seconds according to the “J14 funnel test”, the bolt outer peripheral gap D3 is the diameter of the through hole 6h and the through bolt. The difference from the diameter of 25 is set to be about 1.5 times or more of the side gap D1 and the bottom gap D2. As a suitable example, the diameter of the through hole 6h may be “diameter of the through bolt 25 + 30 (mm) or more” or “diameter of the through bolt 25 + 30-40 (mm)”.

  The fastener 26 has a one-piece structure made of, for example, steel, and has a fitting portion 26a that fits into the through hole 21h of the reinforcing member 21 and a shape corresponding to a fastening tool for the fastener (for example, for a wrench) A tightening operation portion 26b having a hexagonal shape and the like, and a female screw portion 26c screwed with the male screw portion 25a of the through bolt 25 (FIG. 4).

The length of the fitting portion 26a along the tightening direction is, for example, 2/3 or more of the thickness of the reinforcing member 21 in the through hole 21h, and is less than the total of the thickness of the reinforcing member 21 and the side gap D1. It is preferable that the length is as follows.
Further, the gap between the fitting portion 26a and the through hole 21h of the reinforcing member 21 is such that the grout to be filled does not leak, the fastener 26 can be screwed into the through bolt 25, and in the radial direction of the through hole 21h. It shall be set to such an extent that rattling does not occur. The fastener 6 preferably has a one-piece structure in which the fitting portion 26a and the tightening operation portion 26b are integrated.

  The packing material 27 (FIG. 2) is, for example, an elastic body such as urethane resin, and the gap between the side surface of the longitudinal beam 6 to be reinforced and the inner side surface of the reinforcing member 21, and the lower surface and the reinforcement of the longitudinal beam 6 to be reinforced. The gap between the bottom surface of the member 21 is filled and the grout is prevented from leaking through the gap. Note that a wooden frame or the like may be temporarily fixed from the outside of the reinforcing member 21 instead of the packing material 27.

  When the grout filled in the gap between the longitudinal beam 6 to be reinforced and the reinforcing member 21 is cured and the grout layer 28 is formed, the longitudinal beam 6, the reinforcing member 21, and the through bolt 25 are rigidly connected. That is, as shown in the enlarged view attached to FIG. 3, the force F <b> 1 is transmitted from the longitudinal beam 6 to the through bolt 25 through the grout layer 28, and the fitting portion of the fastener 26 is transmitted from the through bolt 25. The force F2 is transmitted to the reinforcing member 21 through 26a. In other words, excellent reinforcement without any force transmission loss is realized.

[Description of design support device and design method]
Next, a design method for the number, diameter, and arrangement of the through bolts 25 will be described.
In the present embodiment, the number, diameter, and arrangement of the through bolts 25 are designed using the design support apparatus 1100. FIG. 5 is a diagram illustrating a hardware configuration example of the design support apparatus 1100. The design support apparatus 1100 according to the present embodiment is a so-called computer, and includes a main body apparatus 1101, a keyboard 1106, and a touch panel 1108. The main body device 1101 includes a control board 1150. The control board 1150 includes a CPU 1151, a storage medium such as an IC memory 1152 and a hard disk, an interface IC 1153 that controls input / output of data with the keyboard 1106, the touch panel 1108, and the like.

FIG. 6 is a block diagram illustrating a functional configuration example of the design support apparatus 1100.
The design support apparatus 1100 includes an operation input unit 100, a processing unit 200, an image display unit 360, and a storage unit 500.

  The operation input unit 100 outputs an operation input signal to the processing unit 200 according to various operation inputs made by the operator. The keyboard 1106 and the touch panel 1108 in FIG. 5 correspond to this.

  The processing unit 200 is realized by, for example, a microprocessor such as a CPU or a GPU, an electronic component such as an ASIC (Application Specific Integrated Circuit), an IC memory, and the like, and is connected to each functional unit including the operation input unit 100 and the storage unit 500 To control data input / output. Then, various arithmetic processes are executed based on predetermined programs and data, operation input signals from the operation input unit 100, and various data to control the operation of the design support apparatus 1100. The control board 1150 in FIG. 5 corresponds to this. The processing unit 200 in this embodiment includes an assumed cross-sectional force setting unit 202, a temporary setting unit 204, a proof stress calculation unit 206, an evaluation unit 208, and an image generation unit 260.

  The assumed cross-sectional force setting unit 202 performs control related to the setting of the assumed cross-sectional force acting on the joint portion between the target horizontal portion (the vertical beam 6 in the present embodiment) and the viaduct pillar 22, that is, the reinforcing member 21 and the through bolt 25. . The assumed cross-sectional force includes at least a design bending moment, a design shear force, and a design axial force obtained from the limit load condition assumed for the RC viaduct 2 after reinforcement. Specifically, an input screen for inputting the assumed cross-sectional force is displayed on the image display unit 360, and those values input by the operator from the operation input unit 100 are temporarily stored in the storage unit 500.

  The temporary setting unit 204 performs control related to setting of a temporary arrangement configuration of the through bolt 25. In the present embodiment, the setting is made with reference to the arrangement configuration data 510 (stores the position coordinates through which the through bolt 25 is inserted, see FIG. 7) stored in advance in the storage unit 500. It is also possible to have a configuration in which an input screen for inputting arrangement configuration data is displayed on the image display unit 360 and a value input by an operator is temporarily stored in the storage unit 500.

  The proof stress calculation unit 206 includes a first proof stress of the joint with respect to the bending moment of the viaduct pillar 22 centering on one end of the reinforcing member 21 in the horizontal direction (the longitudinal direction of the longitudinal beam 6 in this embodiment), The second proof stress against the axial force and the shearing force at the part is calculated based on the provisional arrangement configuration set by the provisional setting unit 204.

  The evaluation unit 208 evaluates the provisional arrangement configuration based on the assumed sectional force, the first and second proof stresses, and the given safety factor. In the present embodiment, an evaluation value is calculated according to a predetermined calculation formula described later, and is stored in the evaluation value data 530 of the storage unit 500 in association with the provisional arrangement configuration identification information.

  The image generation unit 260 generates an image signal of a display screen realized by, for example, a processor such as a GPU or a digital signal processor (DSP), an IC memory for a drawing frame such as a video signal IC or a frame buffer, and the like. To 360.

  The image display unit 360 displays various images such as an input screen based on the image signal input from the image generation unit 260. For example, it can be realized by an image display device such as a flat panel display, a cathode ray tube (CRT), a projector, or a head mounted display. In this embodiment, the touch panel 1108 in FIG. 5 corresponds to this.

  The storage unit 500 stores a system program for realizing various functions for causing the processing unit 200 to control the design support apparatus 1100 in an integrated manner, a program necessary for design support, various data, and the like. Further, it is used as a work area of the processing unit 200, and temporarily stores calculation results executed by the processing unit 200 according to various programs, input data input from the operation input unit 100, and the like. Such a function is realized by, for example, an IC memory such as a RAM or a ROM, a magnetic disk such as a hard disk, or an optical disk such as a CD-ROM or DVD. This corresponds to an information storage medium such as an IC memory 1152 and a hard disk mounted on the control board 1150 of FIG.

The storage unit 500 of this embodiment stores a system program 501 and a design support program 502.
The system program 501 is a program for realizing basic functions of input / output as a computer of the design support apparatus 1100.
The design support program 502 reads and executes the processing unit 200 to realize functions as an assumed sectional force setting unit 202, a temporary setting unit 204, a proof stress calculation unit 206, an evaluation unit 208, and an image generation unit 260. However, the application software may be configured as a part of the system program 501.

  In addition, the storage unit 500 stores arrangement configuration data 510 and bolt specification data 520 in advance, and stores evaluation value data 530 along with execution of design support. Of course, the storage unit 500 can also appropriately store other data necessary for design support calculation processing.

For example, as shown in FIG. 7, the arrangement configuration data 510 includes an arrangement position coordinate list 516 that stores the total number of through bolts 514 in association with the arrangement configuration ID 512 and the arrangement position coordinate values of each of the through bolts 25 to be arranged. Are stored in association with each other.
A number of reinforcing bars are arranged inside the longitudinal beam 6 to be reinforced, and it is impossible to cut through the reinforcing bars to provide the through holes 6h because the strength is reduced. Therefore, the position where the through bolt 25 can be arranged is inevitably obtained from the reinforcement of the longitudinal beam 6 to be reinforced. The arrangement configuration is inevitably a combination of positions that can be arranged.

For example, as shown in FIG. 8, the bolt specification data 520 stores a diameter 524, a cross-sectional area 526, and a design shear yield strength 528 in association with the standard ID 522.
It can be said that it is preferable to use an existing standard bolt as the through bolt 25 because of the reduction of the construction cost and the availability. Therefore, the diameter 524, the cross-sectional area 526, and the design shear yield strength 528 stored in the bolt specification data 520 are the existing standard values. Of course, if a non-standard dedicated design is allowed, those values should be included in the data.

  FIG. 9 is a flowchart for explaining the flow of processing related to design support of the design support apparatus 1100. The processing described here is realized by the processing unit 200 executing the design support program 502.

  First, the processing unit 200 executes a condition setting process for setting design conditions including an assumed cross-sectional force (step S2). Specifically, as design conditions, (1) cross-sectional specifications of the longitudinal beam 6 to be reinforced, and (2) design bending moment Md, design shear force Vd, design axis as an assumed cross-sectional force acting on the joint between the column and the beam An input screen for inputting force Nd and (3) safety coefficient γb is displayed. Then, the input data is stored in the storage unit 500.

  Next, the process part 200 performs the process of the loop A about each arrangement configuration of the penetration bolt 25 (step S10-S40). In the present embodiment, it is executed for each arrangement configuration indicated by the arrangement configuration ID 512 of the arrangement configuration data 510.

In the loop A, the processing unit 200 calculates the dimension of the reinforcing member 21 according to the processing target arrangement configuration (step S12), and the rotational center position of the reinforcing member 21 and the rotational center distance Li (i = through bolt) of each through bolt. (Identification number) is calculated (step S14).
The side surface dimensions of the reinforcing member 21 (the height of the side surface of the reinforcing member 21 and the length in the longitudinal direction of the longitudinal beam 6 to be reinforced) are further increased from the arrangement position of the outermost through bolt 25 in the arrangement configuration to be processed. It is determined that a predetermined length is secured outside in the direction or the longitudinal direction of the beam.
For example, as shown in FIG. 10, the rotation center distance Li is such that a load W acts on the viaduct pillar 22 in the longitudinal direction of the longitudinal beam 6 to be reinforced, and one end of the bottom surface of the reinforcement member 21 is the rotation center 30. It is calculated on the assumption that 21 rotates. Note that FIG. 10 shows an example in which the number of through bolts 25 is five, but in actuality, it follows the arrangement configuration to be loop processed.

Next, loop B is executed for each standard of selectable through bolt 25 (step S20).
In the loop B, first, for each through bolt 25, the resistance force against the bending moment, that is, the bending strength, is calculated by the following equation (1) (step S22).
Bending strength Pi = Pmax × (Li / Lmax) (1)
(Where i = standard identification number, Pmax = fs × Ai)
Based on the resistance force of all through bolts 25, the bending strength of the entire joint to which the reinforcing member 21 is attached is calculated by the following equation (2) (step S24).
Total bending strength Mud = ΣPi · Li / γb (2)

Next, for each through bolt 25, the acting axial force and the resistance force against the shearing force based on the axial force, that is, the shear strength, are calculated by the following equation (3) (step S26).
Shear strength Qi = fs x Ai (3)

And based on the shear strength of all the penetration bolts 25, the shear strength of the whole joining part to which the reinforcement member 21 is attached is calculated by following Formula (4) (step S28).
Total shear strength Vud = ΣQi / γb Formula (4)

Next, an evaluation value ki is calculated by the following equation (5) based on the yield strength of the entire joint, and the arrangement configuration ID 512 that is the processing target of the loop A and the processing of the loop B are added to the calculated evaluation value ki. The target standard ID 522 is associated and stored in the evaluation index data 530 (step S30), and the loop B is terminated (step S32).
Evaluation value ki = γb {(Md / Mud) + (SQRT [Nd ² + Vd ² ] / Vud)} Expression (5)

  If the loop B is executed for all the specifications of the selectable bolts, the processing of the loop A for the arrangement configuration of the through bolts 25 that are currently processed is terminated (step S40).

  If steps S12 to S14 and loop B have been executed for all the arrangement configurations corresponding to the arrangement configuration ID 512 of the arrangement configuration data 510, the processing unit 200 next descends the evaluation values stored in the evaluation value data 530 in descending order. Then, the evaluation value ki, the arrangement configuration ID 512 of the through bolt 25, and the standard ID 522 of the through bolt 25 are displayed on the screen in association with each other (step S42). The best arrangement configuration is presented and output at the highest level. The designer can appropriately select an option that satisfies both the strength requirement and the cost with reference to the result of the screen display.

[Description of construction order]
Next, the construction order will be described. In addition, description is abbreviate | omitted about installation of the scaffold etc. which concern on each process. FIG. 11 is a flowchart for explaining the construction order in the present embodiment.
First, the through-hole 6h is provided in the longitudinal beam 6 to be reinforced (the target horizontal portion of the reinforced concrete structure viaduct in the present embodiment) (step T2: opening step). Next, the reinforcing member 21 is placed on the longitudinal beam 6 to be reinforced (step T4: provisional arrangement step). At this time, alignment is performed so that the through-hole 21h provided in the reinforcing member 21 and the through-hole 6h of the beam are opened substantially coaxially.

  Next, the through bolts 25 are passed through the both side portions of the reinforcing member 21 and the through holes 6h of the longitudinal beam 6 to be reinforced, and the fasteners 26 are screwed into both ends of the inserted through bolts 25 to be fastened and fixed (step). T6: bolt installation step). At this time, the fitting portion 26 a of the fastener 26 is fitted into the through hole 21 h of the reinforcing member 21.

Next, the packing material 27 is inserted into the side opening of the reinforcing member 21, and the bonding material (the main material is inserted into the gap between the one side portion, the bottom portion, and the other side portion of the reinforcing member 21 and the longitudinal beam 6 to be reinforced). In this embodiment, grout) is filled from one side by a one-push method (in this embodiment, by natural fall by pouring from the top) (step T8: filling step). Note that the pouring position may be one central position in the longitudinal direction of the reinforcing member 21 (the direction of the longitudinal beam 6), or pouring from a plurality of positions arranged at equal intervals in the longitudinal direction.
Next, the grout is cured (step T10: curing step). When the grout is hardened, the vertical beam 6 to be reinforced and the reinforcing member 21 are rigidly connected by the grout layer 28 to complete the construction.

  12-13 is a figure which shows the example of the inflow situation of the grout in a filling step in time series. As shown in FIG. 12 (1), it is assumed that the grout 9 (shaded portion of the column) is poured from the upper left part of the reinforcing member 21. Depending on the flow characteristics of the grout 9 and the setting of each gap (side gap D1, bottom gap D2 and bolt outer circumference gap D3), the grout 9 is located on the left side (one side) along the left inner surface of the reinforcing member 21. Flowing down the gap D1, the grout gradually begins to fill from the left end position G1 of the bottom gap D2.

  The grout 9 gradually flows toward the right in the bottom gap D2, but also starts to accumulate along the left side gap D1 due to its low fluidity. Then, as shown in FIG. 12 (2), when the upper part of the grout 9 in the left side gap D1 eventually reaches the left opening position G2 of the lower through-hole 6, the grout 9 also enters the bolt outer circumferential gap D3. It starts to flow. The grout 9 flowing into the bottom gap D2 eventually reaches the right end position G3, and gradually fills the right side (the other side) side gap D1 upward. Eventually, it reaches the right opening position G4 of the lower through-hole 6h.

  However, in this embodiment, since the bolt outer peripheral gap D3 is set larger than the bottom gap D2, the grout 9 via the bottom gap D2 reaches the right opening position G4 as shown in FIG. 13 (3). It is earlier that the grout 9 that fills the bolt outer periphery gap D3 reaches the right opening position G4. From another viewpoint, the grout 9 that has pushed out the air in the lower through hole 6h joins the grout 9 that rises from the right end position G3 to the right opening position G4. Accordingly, as shown in FIG. 13 (4), the grout 9 is filled by “one-pressing” into the lower through-hole 6h.

  Here, it is also important that the grout 9 passing through the bottom gap D2 reaches the right end position G3 of the side gap D1 at the timing when the grout 9 that has pushed out the air in the lower through hole 6h reaches the right opening position G4. It is. If it does not reach the bottom gap D2, for example, it has only reached the middle of the left and right, the grout 9 overflowing from the lower through hole 6h flows down the right side gap D1 and from the right end position G3 to the bottom gap. It will flow into D2. In this case, the grouting 9 coming from the left end position G1 and the bottom gap D2 join together, and there is a problem that bubbles may not be sufficiently removed from the bottom gap D2, resulting in insufficient strength.

  Now, when the grout 9 passing through the lower through hole 6h reaches the right opening position G4, the grout 9 reaches the left opening position G5 of the upper through hole 6h in the left side gap D1, and the upper stage The grout 9 starts to flow into the through hole 6h. The timing at which the grout 9 flowing into the upper through hole 6h reaches the right opening G6 of the through hole is set to be earlier than the grout 9 rising from the right opening position G4 to the right side gap D1. ing. Therefore, the grout 9 is also filled by “one-pressing” in the upper through hole 6h.

  Grouting 9 is continued until the top of the right side gap D1 is filled. When the grout 9 is cured, the state shown in FIG. 3 is finally obtained, the grout layer 28 is formed, and the longitudinal beam 6 and the reinforcing member 21 are extremely strongly connected.

[Explanation of loading experiment]
FIG. 14 is a diagram illustrating a result of a loading test on the horizontal portion after reinforcement in the present embodiment.
In the loading experiment, as shown in FIG. 14 (1), a full-size temporary beam 6 'is produced and this is regarded as a horizontal portion to be reinforced, and a set of reinforcing members 21 and the like are attached in the same manner as described above. It was. However, the viaduct pillar 22 is shorter than the actual due to space limitations in the laboratory. Then, the reinforced temporary beam 6 'is turned upside down and fixed to the test apparatus, and is alternately applied to the viaduct pillar 22 by an actuator in a direction orthogonal to the longitudinal direction of the beam (the load direction is reversed). The displacement of the reinforcing member 21 was measured by applying a load. From the result of repeated measurement while increasing the load stepwise, the graph of FIG. 14 (2) was obtained. As a result of the loading test, the force is transmitted well at the joint between the reinforcing member 21 according to the present embodiment and the horizontal part to be reinforced, so that the column / beam joint has sufficient strength. I found out.

  FIG. 15 is a diagram showing a result of the second loading experiment when the load direction is the longitudinal direction of the virtual beam 6 '. As shown in FIG. 15 (1), an experimental body was prepared in the same manner as in the previous loading experiment, and an alternating load was applied to the viaduct pillar 22 in the longitudinal direction of the beam by an actuator to measure the displacement of the reinforcing member 21. However, in the experiment, the load was increased until the final destruction. From the measurement result, the graph of FIG. 15 (2) was obtained. In design, 190 (kN) is the assumed yield load. However, even in the region where the expected yield load is exceeded, the residual bolt remains and does not break, and the through bolt 25 breaks at 308 (kN). Even from the result of the second loading experiment, although the direction of the load is different, the force is transmitted well between the reinforcing member 21 and the horizontal part to be reinforced, and the column / beam joint is sufficient. It was found to have proof stress.

  Thus, according to the present embodiment, the grout (binding material) that wraps around to the other side through the bottom gap D2 is formed in the through hole 6h of the target horizontal portion (vertical beam 6) through which the through bolt 25 is inserted. Since the grout that has passed through the through hole 6h reaches the opening on the other side before reaching the opening on the other side, the penetration of the target horizontal portion (vertical beam 6) Air bubbles, that is, unfilled portions hardly remain in the holes 6, and a high filling degree can be realized. Moreover, since it is only necessary to fill the grout under the natural flow of the push-push method, an apparatus for increasing the filling pressure is unnecessary, and the man-hour and cost can be reduced.

  In addition, transmission of force from the target horizontal portion (vertical beam 6 in the present embodiment) of the reinforcement target portion to the through bolt 25 is performed via the bonding material filled in the through hole 6h, and further from the through bolt 25. Transmission of force to the reinforcing member 21 is performed via the fastener 26. Therefore, the object horizontal portion, the through bolt 25, and the reinforcing member 21 can be more firmly rigidly connected.

[Second Embodiment]
Next, a second embodiment to which the present invention is applied will be described. Although the present embodiment is basically realized in the same manner as the first embodiment, the configuration relating to the transmission of force between the through bolt 25 and the reinforcing member 21 is different. In the following, differences from the first embodiment will be mainly described, and the same components as those in the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

  FIG. 16 is a longitudinal cross-sectional view of the target horizontal portion after reinforcement in the present embodiment. The target horizontal portion after reinforcement of the present embodiment has a structure including a reinforcing member 21, a viaduct pillar 22, a foundation 24, a through bolt 25, a fastener 26 </ b> B, and a grout layer 28.

  FIG. 17 is a diagram illustrating a configuration example of the fastener 26B in the present embodiment. The fastener 26B includes a tightening operation portion 26b having a shape (for example, a hexagon for a wrench) corresponding to a tightening tool for the fastener, and a female screw portion 26c that is screwed with the male screw portion 25a of the through bolt 25. And a washer portion 26d larger than the diameter of the through hole 21h of the reinforcing member 21. In the present embodiment, the fastener 26B has a one-piece structure in which the tightening operation portion 26b and the washer portion 26d are integrated, but may have a two-piece structure in which both are separate parts.

  The filling process of the grout (binding material) into the side gap D1, the bottom gap D2, and the bolt outer circumference gap D3 in this embodiment is the same as that in the first embodiment (see FIGS. 12 and 13). In this embodiment, as shown in FIG. 16, when the fastener 26B is screwed to the through bolt 25, the inner portion of the through hole 21h of the reinforcing member 21 (of course, the through bolt 25 passes therethrough). The space is continuous with the side gap D1, and the grout is also filled in the grout filling process. That is, as shown in the enlarged view of FIG. 16, the force F1 is transmitted from the longitudinal beam 6 to the through bolt 25 through the grout layer 28, and the portion of the grout layer 28 in the through hole 21h from the through bolt 25. The force F2 is transmitted to the reinforcing member 21 via the.

[Modification]
As described above, the embodiments to which the present invention is applied have been described. However, the present invention is not limited to these embodiments, and appropriate additions, omissions, and modifications for the configuration may be made without departing from the gist of the invention. Can do.

  For example, in the above embodiment, the through bolts 25 are inserted into the upper and lower two stages, and the diameters of the through holes 6h of the corresponding vertical beams 6 are the same, but the grout filling as shown in FIGS. As long as can be realized, the diameters may be different from each other. The same applies to the value of the left and right side gaps D1. Further, although the side gap D1 has the same width from the top to the bottom, for example, the size of the gap may be different up and down, for example, the bottom is wide and narrows toward the top.

  Moreover, in each embodiment mentioned above, although the horizontal part made into reinforcement object was illustrated as the vertical beam 6, it can also be set as the horizontal beam 8. FIG. Moreover, it can apply not only to a beam but to a girder. In addition, one viaduct pillar may not be replaced with two existing pillars, but one viaduct pillar may be replaced with one existing pillar.

  In the above embodiment, the viaduct pillar 22 is provided. However, when the pillar is unnecessary, that is, when only the reinforcement of the beam or the girder is intended, the viaduct pillar 22 can be omitted.

  Further, the grout material can be selected from cement (mortar) type, glass type, synthetic resin and the like according to cost, reinforcing strength and the like.

2 ... RC viaduct 4 ... Pillar (existing)
6 ... Vertical beam 8 ... Horizontal beam 9 ... Grout (binding material)
DESCRIPTION OF SYMBOLS 10 ... Board | substrate 12 ... Track 14 ... Soundproof fence 20 ... Horizontal part structure 21 ... Reinforcement member 22 ... Viaduct pillar 23 ... Connection part 24 ... Foundation 25 ... Through bolt 26 ... Fastener 26a ... Fitting part 26b ... Tightening operation part 26c ... Female thread part 26d ... Washer part 27 ... Packing material 28 ... Grout layer 100 ... Operation input part 200 ... Processing part 200
DESCRIPTION OF SYMBOLS 202 ... Assumed section force setting part 204 ... Temporary setting part 206 ... Strength calculation part 208 ... Evaluation part 500 ... Memory | storage part 502 ... Design support program 510 ... Arrangement configuration data 520 ... Bolt specification data 530 ... Evaluation value data 1100 ... Design support Device 1150 ... Control board

Claims (7)

Reinforced concrete structure viaduct beam or girder (hereinafter referred to as “target horizontal part”) is directed to a U-shaped reinforcing member, and through bolts are passed through both side parts of the reinforcing member and the target horizontal part. A horizontal portion structure configured by filling a gap between the reinforcing member and the target horizontal portion with a binder,
The gap is provided between one side, the bottom and the other side of the reinforcing member, and the target horizontal part,
The binding material flowed down from one side of the gap passes through the bottom side to the other side, and the other side of the through hole of the target horizontal part through which the through bolt penetrates. Prior to reaching the opening, the material of the binding material, the gap interval and the diameter of the through hole were determined so as to flow out from the opening on the other side through the through hole.
Horizontal structure. The gap is filled in the gap by one-pressing from the one side and natural flow.
The horizontal part structure of Claim 1. Before the binding material that has flowed down from one side of the gap flows out of the opening on the other side through the through-hole, it wraps around to the other side through the bottom side, The material of the binding material, the gap interval and the diameter of the through hole were determined,
The horizontal part structure of Claim 1 or 2. In the through hole, a difference in diameter with the through bolt is determined to be larger than the gap.
The horizontal part structure as described in any one of Claims 1-3. The through hole is defined to have a diameter that is at least 30 mm larger than the diameter of the through bolt,
The horizontal part structure as described in any one of Claims 1-4. The binding material is made of a material having a J14 funnel flow time of 6 seconds to 10 seconds,
The horizontal part structure as described in any one of Claims 1-5. An opening step for providing a through-hole for penetrating a through-bolt in a target horizontal part of the reinforced concrete structure viaduct;
A provisional arrangement step of assigning a reinforcing member having a U-shaped cross section to the target horizontal portion;
A bolt installation step of penetrating through-bolts through the through-holes of both sides of the reinforcing member and the target horizontal portion;
A filling step of filling a gap between the one side part, the bottom part, and the other side part of the reinforcing member and the target horizontal part with a predetermined fluidity by a one-push method from one side part; ,
Including
The interval between the gaps and the diameter of the through-holes are such that the binding material that has flowed down from one side of the gap wraps around the other side through the bottom side and the other side of the through-hole. Provided to flow out from the opening on the other side through the through hole before reaching the opening,
Reinforcing member installation method.

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