JP4810959B2 - Buried formwork mounting structure, mounting method, concrete structure reinforcing method, and concrete structure - Google Patents

Description

  The present invention relates to a method for attaching an embedded form used when concrete is placed on the surface of a concrete structure for reinforcement, a mounting structure, a method for reinforcing a concrete structure using the embedded form, and a concrete structure.

  Conventionally, as a method of reinforcing an existing concrete structure, an embedded formwork is installed at a certain distance from the concrete structure, and after placing concrete between the concrete structure and the embedded formwork, the formwork is By burying as it is without removing, the durability of the concrete is improved, and an embedded formwork method for improving the workability is widely used. In order to install such a buried formwork, an anchor placed in a concrete structure is penetrated and fixed in a through hole provided in advance in the buried formwork. For this reason, since an anchor must be driven with high position accuracy, a high skill is required.

Therefore, for the purpose of easily attaching the embedded formwork, for example, Patent Document 1 discloses that a plurality of adjustment formwork boards fixed in parallel to the reinforcing surface of the concrete structure and an adjacent adjustment formwork board. There is described a method for attaching an embedded form which is installed and constitutes an embedded form with a main formwork board which is installed so that both end edges overlap with an end edge of an adjacent adjustment formwork board.
JP 2005-133378 A

  However, in such a method for attaching the embedded mold, the embedded mold is constituted by a plurality of members, so that the number of members increases. For this reason, there existed a problem that workability will fall, such as attachment work taking time.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to enable an embedded formwork to be attached with good workability by a simple configuration.

  The embedded form mounting structure of the present invention is an embedded form mounting structure for reinforcing a concrete structure, and is disposed at a predetermined interval from the surface of the concrete structure. And a steel plate panel having at least a peripheral rib connected to the embedded formwork from the opposite side of the concrete structure, and abutting the steel plate panel from the opposite side of the concrete structure. In addition, a flat plate connected in the vertical direction, an anchor placed on the surface of the concrete structure, and penetrating through the embedded formwork, the steel plate panel, and a through hole provided in the flat plate, and the anchor And a fixing means for fixing the embedded formwork, the steel plate panel, and the flat plate material to the anchor.

  According to the present invention, an embedded formwork can be attached with a simple configuration in which a steel plate panel and a flat plate are fixed to an anchor placed in a concrete structure.

  In the mounting structure for the embedded mold, a seal member may be provided so as to close a gap between the through hole of the embedded mold and the anchor.

  By attaching the seal member so as to close the gap between the through hole of the embedded formwork and the anchor, it is possible to prevent the concrete from leaking from the gap when placing concrete.

  The embedded form may be made of a high toughness cement board. According to the high toughness cement board, the manufacturing cost can be suppressed, and the workability is improved because the thin plate sufficiently functions as a protective material.

Further, the surface of the concrete structure is curved, the buried type frame, to be curved to match the curvature of the surface of the concrete structure, come sandwiched between the steel panels and the buried formwork It may be provided with an elastic member.

  The embedded form mounting method of the present invention is a method of attaching an embedded form to reinforce a concrete structure, wherein an anchor is placed on the surface of the concrete structure, and the embedded form is attached to the embedded form. The anchor is inserted through the provided through hole, the embedded formwork is arranged at a predetermined interval from the surface of the concrete structure, and the anchor is inserted into the through hole provided in the steel plate panel having at least a periphery. The steel plate panel is brought into contact with the embedded formwork and the steel plate panels adjacent to each other in the lateral direction are connected to each other, the anchor is inserted through a through hole provided in the flat plate material, and the flat plate material is inserted into the steel plate. The flat plate materials adjacent to each other in the vertical direction are connected to each other, and the embedded formwork, the steel plate panel, and the flat plate material are fixed to the anchor. .

  The method for reinforcing a concrete structure according to the present invention is a method for reinforcing a concrete structure using an embedded formwork, in which an anchor is placed on the surface of the concrete structure and provided on the embedded formwork. The anchor is inserted through the formed through-hole, the embedded formwork is disposed at a predetermined interval from the surface of the concrete structure, and the anchor is inserted into the through-hole provided in the steel plate panel having at least a periphery. The steel plate panel is inserted into contact with the embedded formwork and the steel plate panels adjacent in the lateral direction are connected to each other, the anchor is inserted through a through hole provided in the flat plate material, and the flat plate material is inserted into the steel plate panel. The flat plates adjacent to each other in the vertical direction are connected to each other, the embedded formwork, the steel plate panel, and the flat plate are fixed to the anchor, and the concrete And creation, and Da設 the reinforced concrete between the buried mold after curing of the reinforced concrete, remove the steel panel and the flat plate member, characterized by cutting the anchor to an appropriate length.

  Moreover, this invention shall include the concrete structure characterized by having been reinforced with the reinforcement method of said concrete structure.

  According to the present invention, the embedded formwork can be attached with a simple configuration, and the workability can be improved.

  Hereinafter, an embodiment of the mounting structure for an embedded form according to the present invention will be described in detail with reference to the drawings with the tunnel 1 as an object of reinforcement as an example of a concrete structure. FIG. 1 is a cross-sectional view of the wall surface of the tunnel 1 to which the embedded form 11 is attached by the embedded form attachment structure 10 of the present embodiment, and FIG. 2 is a view of the embedded form attachment structure 10 inside the tunnel 1. FIG. 3A is an enlarged view of the periphery of the anchor 12 of the embedded form mounting structure 10, and FIG. 3B is a cross-sectional view of the surface on which the hard rubber 18 and the sponge 19 are arranged.

  The embedded form mounting structure 10 of this embodiment is for placing reinforced concrete on the surface of an existing concrete structure such as the tunnel 1 shown in FIG. As shown in FIGS. 2 and 3, the embedded form mounting structure 10 includes an anchor 12 driven on the surface of the tunnel 1 and an embedded form 11 installed at a predetermined interval from the surface of the tunnel 1. And a metal foam 13 installed so as to come into contact with the buried form 11 from the side opposite to the surface of the tunnel 1 (hereinafter referred to as the tunnel inner wall side), and a metal foam 13 so as to come into contact with the tunnel inner wall side. And a flat bar 14 and a nut 15 and a washer 16 attached to the anchor 12. The embedded form 11, the metal foam 13, and the flat bar 14 are fixed to the anchor 12 by a nut 15 and a washer 16 so that a predetermined interval is maintained between the embedded form 11 and the tunnel wall surface. The concrete is placed between the surface of the tunnel 1 and the embedded form 11 in FIG. 3A, and the concrete is hardened, so that the tunnel 1, the hardened concrete, and the embedded form 11 are integrally formed. The tunnel 1 can be reinforced.

  The embedded form 11 is a flat plate material having high bending strength and deformation performance, such as a high toughness cement board. A through hole 11A having a diameter slightly larger than the diameter of the anchor 12 is provided in the embedded form 11 in advance at a position corresponding to the anchor 12.

  The metal foam 13 is a steel plate rectangular panel member in which ribs are provided on one side of the metal foam 13 along the outer peripheral edge, and ribs are provided in the vertical and horizontal directions at appropriate intervals on the inner side. In the following description, the surface of the metal foam 13 on which the rib is provided is referred to as a rib surface, and the opposite surface is referred to as a flat surface. The metal foam 13 is widely used as a mold material and can be easily obtained at low cost. A through hole 13A having a diameter slightly larger than the diameter of the anchor 12 is provided at a position corresponding to the anchor 12 of the metal foam 13. The metal foams 13 are arranged such that the flat surface is on the tunnel wall surface side and the longitudinal direction extends to the side of the tunnel 1, and the metal foams 13 adjacent in the lateral direction are connected to each other by bolts or the like.

  The flat bar 14 is a steel flat panel, and a through hole 14 </ b> A is provided at a position corresponding to the anchor 12. The flat bars 14 are arranged so that the longitudinal direction thereof extends in the longitudinal direction of the tunnel 1 so as to contact the rib tips of the rib surface of the metal foam 13. It is connected by.

  The anchor 12 is driven on the surface of the tunnel 1 vertically and horizontally at predetermined intervals, has a thread on the surface, and a nut 15 and a washer 16 are attached. The anchor 12 passes through the embedded mold 11, the metal foam 13, and the through holes 11 </ b> A, 13 </ b> A, 14 </ b> A of the flat bar 14. Then, the embedded form 11 and the plate portion on the flat surface side of the metal foam 13 are sandwiched by a nut 15 that is screwed with a thread of the anchor 12 via a washer 16, and further, a nut 15 from the surface of the flat bar 14. Are screwed into the anchor 12 via the washer 16, so that the embedded form 11, the metal foam 13, and the flat bar 14 are fixed.

  Thus, according to the embedded form mounting structure 10, the force acting on the embedded form 11 at the time of placing concrete is borne by the metal foam 13 connected in the horizontal direction and the flat bar 14 connected in the vertical direction. Therefore, the embedded form 11 can be firmly supported. Thereby, it is possible to prevent the embedded form 11 from being deformed or damaged by the pressure of the concrete placed between the tunnel wall surface and the embedded form 11.

  Moreover, as shown in FIG. 1, the surface of the tunnel 1 is curved. For this reason, as shown in FIGS. 3 (A) and 3 (B), the hard rubber 18 is sandwiched between the metal foam 13 and the embedded mold 11 so that the central portion of the embedded mold 11 extends in the lateral direction. The nut 15 and the washer 16 are tightened from both sides. Thereby, in the vicinity of the center of the metal foam 13, the space between the metal foam 13 and the embedded mold 11 is ensured, while the metal foam 13 and the embedded mold 11 are in contact at the upper and lower ends of the metal foam 13, The embedded form 11 can be held in a curved state in accordance with the shape of the tunnel 1. The curved shape of the embedded mold 11 can be adjusted by appropriately adjusting the thickness and position of the hard rubber 18.

  Further, when placing concrete between the surface of the tunnel 1 and the embedded mold 11, the concrete may leak from the gap between the through hole 11 </ b> A provided in the embedded mold 11 and the anchor 12. Therefore, as shown in FIGS. 3A and 3B, by inserting an annular sponge member 19 through the anchor 12 so as to sandwich the embedded mold 11 from both sides, the through hole 11A of the embedded mold 11 The gap with the anchor 12 is closed, thereby preventing the concrete from leaking from the gap.

Next, a method for reinforcing the tunnel 1 using the above-described embedded form mounting structure 10 will be briefly described.
First, anchors 12 are driven at predetermined intervals in both the vertical and horizontal directions on the surface of the tunnel 1 to be reinforced. Next, the nut 15 and the washer 16 are attached to the anchor 12 so that the distance between the surface of the tunnel 1 and the embedded mold 11 is a predetermined distance. Then, the anchor 12 is inserted through the through hole 11 </ b> A provided in the embedded mold 11. At that time, the two sponges 19 are inserted into the anchor 12 so that the sponges 19 are arranged on both sides of the embedded mold 11.

  Next, the anchor 12 is inserted through the through hole 13 </ b> A of the metal foam 13, and the metal foam 12 is brought into contact with the embedded formwork 11. At that time, hard rubber 18 formed in an appropriate thickness is attached to the metal foam 13 in advance in accordance with the curvature of the embedded form 11. After the metal foam 13 is arranged, the embedded form 11 can be bent along the shape of the tunnel 1 by tightening the nut 15 and the washer 16 from the inner wall side of the tunnel. Moreover, the metal foams 13 adjacent to each other in the lateral direction are connected by bolts.

  Next, the anchor 12 is inserted into the through hole 14 </ b> A provided in the flat bar 14, and the flat bar 14 is brought into contact with the embedded formwork 11. And it tightens with the nut 15 and the washer 16 from the tunnel inner wall side. Thereby, the embedded form 11, the metal foam 13, and the flat bar 14 are fixed to the anchor 12.

  Further, the flat bars 14 adjacent to each other in the vertical direction are connected to each other by the reinforcing material 17. Thereby, the flat bars 14 arranged in the vertical direction are connected to each other. Through the above steps, the embedded form mounting structure 10 is formed, and the embedded form 11 is supported.

  Next, concrete 20 is placed between the surface of the tunnel 1 and the buried form 11. As the cast concrete 20 is cured, the existing tunnel 1, the embedded formwork 11, and the cured concrete 20 are integrally formed. Next, as shown in FIG. 4, the flat bar 14 and the metal foam 13 are removed, and unnecessary portions protruding to the tunnel inner wall side of the anchor 12 are cut with a baby sander. And in order to prevent peeling of the embedded formwork 11, the reinforcement of the tunnel 1 is completed by attaching the nut 15 and the washer 16 to the anchor 12 from the tunnel inner wall side.

  In addition, FIG. 5 is sectional drawing which shows the attachment structure 30 of the conventional common embedding formwork as a comparative example. As shown in the figure, a conventional embedded mold mounting structure 30 has an embedded mold 31 arranged at a predetermined interval from a concrete structure, and a PVC pipe 32 is provided so as to abut against the embedded mold 31. A prismatic square steel pipe 33 is arranged so as to be in parallel with the vertical direction and abut against the PVC pipe 32 and extend in the horizontal direction, and an anchor 34 attached to the surface of the concrete structure and a foam tie 35 attached to the anchor 34. Thus, the square steel pipe 33 is pressed down. On the other hand, as shown in FIG. 3B, in the mounting structure 10 for the embedded form 11 of this embodiment, the embedded form 11 is supported by the metal foam 13 via the flat bar 14. The flat bar 14 is thinner than the square steel pipe 33 and is directly fixed by the nut 15 via the washer 16. For this reason, it can be seen that the size of the protrusion from the surface of the tunnel 1 of the embedded form mounting structure 10 of this embodiment is greatly reduced as compared with the conventional configuration shown in FIG.

  For example, in the tunnel 1 of the railway business line, the reinforcement work is performed at midnight or early morning when the daily operation is completed without stopping the operation of the train. Since the construction does not end in one day, the train operates in the state shown in FIG. 3A while the embedded form mounting structure 10 is installed on the tunnel surface during the day. In such a case, if the protrusion from the tunnel surface is large, the traveling of the train may be hindered. Therefore, it is desirable that the protrusion is small. On the other hand, according to the embedded form mounting structure 10 of the present embodiment, the protrusion from the surface of the tunnel 1 can be reduced as described above, so that the train travels during the reinforcement work of the railway tunnel 1. Will not be disturbed.

  As described above, according to the embedded form mounting structure 10 of the present embodiment, the embedded form 11 can be configured with a simple configuration in which the metal foam 13 and the flat panel 14 are fixed to the anchor 12 driven in the tunnel 1. Since it can be attached, assembly and disassembly are facilitated, and workability is improved. Further, by attaching the hard rubber 18 to the metal foam 13, the metal foam 13 can be curved in accordance with the curved surface such as the tunnel 1. Thereby, the surface of the tunnel 1 after repair can be made into the smoothly curved shape. Furthermore, since it is thinner than the conventional embedded form mounting structure 30, it does not hinder the operation of the train when reinforcing work such as a tunnel of a railway business line.

  In addition, although this embodiment demonstrated the case where the reinforcement work of the inner wall of the curved tunnel 1 was performed, even if it is a plane like the wall surface of a concrete structure, it is not limited to this, The buried formwork of this invention Reinforcing work can be performed by attaching the embedded formwork according to the mounting structure. In such a case, since the embedded form 11 has a flat plate shape, the hard rubber 18 does not have to be attached in order to be in close contact with the metal foam 13.

It is sectional drawing of the wall surface of the tunnel which attached the embedded formwork. It is the elevation which looked at the attachment structure of the underground form of this invention from the tunnel inner side. (A) is an enlarged view around the anchor of the mounting structure of the embedded formwork, and (B) is a cross-sectional view on the surface where the hard rubber and the sponge are arranged. It is sectional drawing of the tunnel wall surface after reinforcement. It is sectional drawing which shows the attachment structure of the conventional buried formwork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 10 Embedded mold attachment structure 11 Embedded mold 11A Through-hole 12 Anchor 13 Metal foam 13A Through-hole 14 Flat bar 14A Through-hole 15 Nut 16 Washer 17 Reinforcement material 18 Hard rubber 19 Sponge 20 Concrete 30 Conventional attachment structure 31 High toughness cement board 32 PVC pipe 33 Square steel pipe 34 Anchor 35 Foam tie

Claims (7)

A structure for mounting an embedded form for reinforcing a concrete structure,
The embedded formwork arranged at a predetermined interval from the surface of the concrete structure;
A steel plate panel that is in contact with the embedded formwork from the opposite side of the concrete structure and that is connected in the lateral direction and has at least a rib around it,
While abutting from the opposite side of the concrete structure to the steel plate panel, a flat plate connected in the vertical direction,
An anchor that is placed on the surface of the concrete structure and penetrates through holes provided in the embedded formwork, the steel plate panel, and the flat plate;
An embedded structure mounting structure, comprising: an anchor, and a fixing means for fixing the embedded mold, the steel plate panel, and the flat plate material to the anchor.   The mounting structure for an embedded form according to claim 1, further comprising a seal member attached so as to close a gap between the through hole of the embedded form and the anchor.   The mounting structure for an embedded form according to claim 1 or 2, wherein the embedded form is made of a tough cement board. The surface of the concrete structure is curved,
As the buried type frame is curved to match the curvature of the surface of the concrete structure, claim 1, characterized in that it comprises a sandwiched elastic members between the steel panels and the buried formwork 3. The embedded structure mounting structure according to any one of the above. A method of attaching an embedded formwork to reinforce a concrete structure,
An anchor is placed on the surface of the concrete structure,
Inserting the anchor through a through-hole provided in the embedded formwork,
Placing the embedded formwork at a predetermined distance from the surface of the concrete structure;
Inserting the anchor through a through-hole provided in a steel plate panel having at least a rib around it,
Connect the steel plate panels to the embedded formwork and connect the steel plate panels adjacent in the lateral direction,
Insert the anchor through a through hole provided in the flat plate,
The flat plate material is brought into contact with the steel plate panel and the flat plate materials adjacent in the vertical direction are connected to each other,
A method for attaching an embedded form, comprising fixing the embedded form, the steel plate panel, and the flat plate to the anchor. A method of reinforcing a concrete structure using an embedded formwork,
An anchor is placed on the surface of the concrete structure,
Inserting the anchor through a through-hole provided in the embedded formwork,
Placing the embedded formwork at a predetermined distance from the surface of the concrete structure;
Inserting the anchor through a through-hole provided in a steel plate panel having at least a rib around it,
Connect the steel plate panels to the embedded formwork and connect the steel plate panels adjacent in the lateral direction,
Insert the anchor through a through hole provided in the flat plate,
The flat plate material is brought into contact with the steel plate panel and the flat plate materials adjacent in the vertical direction are connected to each other,
Fixing the embedded formwork, the steel plate panel, and the flat plate to the anchor;
Placing reinforced concrete between the concrete structure and the embedded formwork,
After hardening the reinforced concrete, remove the steel plate panel and the flat plate,
A method for reinforcing a concrete structure, comprising cutting the anchor into an appropriate length. A concrete structure reinforced by the method for reinforcing a concrete structure according to claim 6.