JP6211333B2 - Cross section defect member, method of using cross section defect member and fixing method of cross section defect member - Google Patents

Description

  The present invention relates to a cross-sectional defect member used by being embedded in a concrete structure, a method for using the cross-sectional defect member, and a fixing method for the cross-sectional defect member.

  In concrete structures, cracks occur due to temperature changes after placing. When cracks occur in a concrete structure, problems such as corrosion due to moisture intrusion occur. Therefore, for example, as disclosed in Patent Documents 1 to 3, in order to guide a crack generation site to a predetermined location, a cross-section defect member is embedded in a concrete structure to generate a cross-section defect. .

  In Patent Documents 1 to 3, a cross-sectional defect member is fixed to a structural reinforcing bar. Moreover, in patent document 3, a connection member can be added to the member for cross-sectional defect | defects fixed to the structural reinforcement.

JP-A-7-207774 JP 2010-265612 A JP 2012-241353 A

  By the way, when the concrete structure is thick and has a large cross section, cracks are generated from the inside of the concrete structure. Therefore, it is desirable to provide the cross-sectional defect member closer to the center in the thickness direction of the concrete structure. However, since there are many cases where there are no structural reinforcing bars in the concrete structure having a large cross section, it is difficult to provide the cross-sectional defect member near the center in the thickness direction of the concrete structure. Further, in the case of an overcrowded reinforcement or an unreinforced structure, it may be difficult to fix the induction joint member at a predetermined position after the reinforcement.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a concrete having a large cross section so that a cross-section defect member can be provided at a predetermined position without being fixed to a structural reinforcing bar. The aim is to be able to induce cracks in the structure as intended.

  In order to achieve the above object, in the present invention, it is possible to be fixed and self-supported on a precast concrete member.

A first aspect of the present invention is a cross-sectional defect member that is embedded in a concrete structure and causes a cross-sectional defect.
A strut extending in the vertical direction, a stretching member joined to the strut and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which a lower end portion of the strut is fixed,
The base portion is fixed to a precast concrete member, and the support column and the extending member are self-supporting.

A second invention is a method of using a cross-sectional defect member that is embedded in a concrete structure to cause a cross-sectional defect.
A cross-sectional defect member comprising a column extending in the vertical direction, an extending member bonded to the column and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which the lower end of the column is fixed is prepared. ,
The base portion is fixed to a precast concrete member, and the support column and the extending member are used independently.

3rd invention is the fixing method of the cross-section defect | deletion member which is embedded in a concrete structure and produces a cross-section defect | deletion,
A cross-sectional defect member comprising a column extending in the vertical direction, an extending member bonded to the column and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which the lower end of the column is fixed is prepared. ,
The base portion is fixed to a member embedded in a precast concrete member, and the support column and the extending member are made independent.

  According to each configuration described above, the cross-sectional defect member is fixed to the precast concrete member and is self-supporting, so that it is not necessary to fix the cross-sectional defect member to the structural reinforcing bar. Therefore, even if it is a concrete structure of a large cross section, it becomes possible to make a cross-sectional defect member self-supporting near the center of the thickness direction. Moreover, even if it is an overcrowded reinforcement or an unreinforced structure, it becomes possible to make a cross-sectional defect member self-supporting in a predetermined position.

  You may comprise a cross-sectional defect member with the member (dimension bolt, plate, etc.) embedded in a precast concrete member, and a cross-section defect member main body.

  Moreover, the cross-sectional defect member main body in which the cross-sectional defect member extends vertically and a base portion fixed to the precast concrete member may be provided.

  The base portion may be formed with a fixing hole through which a fastener projecting from the precast concrete member is inserted, and the base portion may be fixed to the fastener inserted through the fixing hole. .

  According to this configuration, it is possible to securely fix the cross-sectional defect member at a predetermined position of the precast concrete member by inserting the fastener of the precast concrete member into the fixing hole of the base portion.

  The base portion is formed with a plurality of fixing holes spaced apart from each other, and the fastener has a screw shaft that protrudes upward from the upper surface of the precast concrete member, and corresponds to the fixing holes. And a plurality of the base portions may be fastened and fixed to the screw shafts by nuts screwed to the screw shafts.

  According to this configuration, the fastening height of the fixing hole of the base portion with respect to each screw shaft can be changed, so that the angle can be adjusted so that, for example, the cross-sectional defect member body is vertical.

  In addition, a connection member for connecting a lower portion of another cross-sectional defect member is provided on an upper portion of the cross-sectional defect member body, and the connection member is fastened and fixed to a lower portion of the other cross-sectional defect member by a fastening member. You may make it do.

  According to this configuration, when the height of the concrete structure is high, the cross section corresponding to the height of the concrete structure is fastened and fixed to the upper part of the cross section defect member main body at the lower part of the other cross section defect member. It is possible to easily construct the missing member.

  The cross-sectional defect member main body extends in the thickness direction of the concrete structure, and the cross-sectional defect member main body is provided with a water stop material so as to correspond to a crack portion formed in the concrete structure. It may be.

  According to this configuration, when water outside the concrete structure enters the concrete structure from the induced cracked part and reaches the cross-section defect member body, it penetrates deeper by the water-stopping material. Can be prevented.

  According to the present invention, since the cross-sectional defect member can be provided at a predetermined position without being fixed to a structural reinforcing bar, a formwork, or the like, it is possible to induce a crack as intended in a concrete structure having a large cross section.

It is the perspective view which looked at the section lacking member concerning the embodiment of the present invention from the upper part. It is a side view of a cross-sectional defect member. It is a top view of a section lacking member. It is a figure explaining the 1st use condition of a section lacking member. It is a perspective view of the lower part of a section lacking member fixed to a pre-cast concrete member. It is a longitudinal cross-sectional view of a fastening part. It is a perspective view which shows the state which connected the cross-section defect | deletion member up and down. It is a longitudinal cross-sectional view of the concrete structure which embedded the cross-sectional defect | deletion member. It is a figure explaining the 2nd use condition of a section lacking member. It is a figure explaining the 3rd use condition of a section lacking member. It is FIG. 8 equivalent view which concerns on the 3rd use condition of a cross-sectional defect | deletion member. FIG. 5 is a view corresponding to FIG. 4 in which a cross-section defect member is used in an overcrowded arrangement. FIG. 6 is a view corresponding to FIG. 3 according to Modification 1 of the embodiment. FIG. 6 is a view corresponding to FIG. 3 according to a second modification of the embodiment. It is FIG. 3 equivalent view which concerns on the modification 3 of embodiment. It is a figure which shows the state which embedded the plate which concerns on the modification 4 of embodiment in the precast concrete member. It is a figure which shows the fixation structure of the cross-sectional defect member which concerns on the modification 4 of embodiment. It is a figure which shows the state which embedded the plate which concerns on the modification 5 of embodiment in the precast concrete member. It is a figure which shows the fixation structure of the cross-sectional defect member which concerns on the modification 5 of embodiment. It is a figure which shows the state which embedded the plate which concerns on the modification 6 of embodiment in the precast concrete member. It is a figure which shows the fixation structure of the cross-sectional defect member which concerns on the modification 6 of embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a perspective view of a cross-sectional defect member 1 according to an embodiment of the present invention. The cross-sectional defect member 1 is embedded in the concrete structure 100 and causes a crack in a desired portion by causing a cross-sectional defect in the concrete structure 100. The concrete structure 100 is not particularly limited, but for example, a wall having a large cross section with a thickness of 1 m or more, an overcrowded concrete structure in which structural reinforcing bars are closely arranged, or a structure without reinforcing reinforcing bars. Examples include reinforced concrete structures. Moreover, the concrete structure 100 is constructed | assembled on the precast concrete member 101 as shown in FIGS. The precast concrete member 101 is, for example, a bottom board or a part of a wall.

  As shown in FIGS. 1 and 2, the cross-section defect member 1 is provided in a vertically extending cross-section defect member main body 10 and a pre-cast concrete member 101 that is provided at a lower portion of the cross-section defect member main body 10 to construct a concrete structure 100. And a base portion 20 fixed to the head.

  The cross-sectional defect member main body 10 includes a column 11, first and second extending members 13 and 15 extending in the thickness direction of the concrete structure 100, and a connecting member 17. The support | pillar 11, the 1st and 2nd extending members 13 and 15, and the connection member 17 can be comprised with metal materials, such as a steel plate, for example.

  The column 11 has a main plate portion 11 a extending in the thickness direction of the concrete structure 100. The main plate portion 11a has a substantially rectangular shape that is long in the vertical direction when viewed from the side. The support | pillar 11 has the 1st protrusion board part 11b and the 2nd protrusion board part 11c which protrude from the width direction (equivalent to the thickness direction of the concrete structure 100) of the main board part 11a. The first protruding plate portion 11b protrudes in a direction orthogonal to the main plate portion 11a. The second protruding plate portion 11c is orthogonal to the main plate portion 11a and protrudes in the opposite direction to the first protruding plate portion 11b.

  The 1st extending | stretching member 13 has the joining board part 13a extended along the 1st protrusion board part 11b of the support | pillar 11, and the extending | stretching board part 13b extended | stretched in the thickness direction of the concrete structure 100 from the edge of the joining board part 13a. Have. The joining plate portion 13a is joined to the first projecting plate portion 11b of the support column 11 by welding or the like. The water stop material 13c is provided in a state of being laminated on both surfaces at the front end side in the extending direction of the extending plate portion 13b. Since the crack is generated starting from the leading end side of the stretched plate portion 13b, the position of the water blocking material 13c is a position corresponding to the crack portion formed in the concrete structure 100.

  The water blocking material 13c has adhesiveness with mortar, and for example, rubber disclosed in JP-A-11-60823 can be used. That is, each component of the rubber is formulated so that it can be adhered to the mortar without applying a primer. When the mortar is dried on a mortar that has not been dried, the rubber adheres firmly to the mortar. It has properties. Moreover, this rubber | gum has water impermeability which does not let water pass.

  The second extending member 15 is a joining plate portion 15a extending along the second projecting plate portion 11c of the support column 11, and the first extending member 13 in the thickness direction of the concrete structure 100 from the edge of the joining plate portion 15a. And an extending plate portion 15b extending to the opposite side. The joining plate portion 15a is joined to the second projecting plate portion 11c of the column 11 by welding or the like. A water stop material 15c similar to that of the first stretching member 13 is provided on the both ends of the stretching plate portion 15b in the stretching direction. The first extending member 13 and the second extending member 15 are common members.

  It is preferable that the 1st extending | stretching member 13 and the 2nd extending | stretching member 15 are comprised with materials with corrosion resistance, such as an alloy steel plate and a hot-dip galvanized steel plate, for example.

  The base part 20 is comprised by the rectangular board | plate material extended substantially horizontal. On the upper surface of the base portion 20, the lower portions of the support column 11, the first and second extending members 13, 15 are fixed to the central portion in the width direction of the base portion 20 by welding or the like. Since the first projecting plate portion 11 b and the second projecting plate portion 11 c of the support column 11 project in opposite directions, the cross-sectional defect member main body 10 is stabilized in a state of being fixed to the base portion 20. Further, fixing holes 20a are formed in the vicinity of the four corners of the base portion 20 so as to penetrate in the vertical direction.

  The connection member 17 is provided on the upper part of the cross-sectional defect member body 10 and is a member for connecting the lower part of another cross-sectional defect member 30 (shown in FIG. 7). The connecting members 17 are fixed to both sides in the thickness direction of the main plate portion 11a of the column 11 of the cross-sectional defect member main body 10, respectively. One connecting member 17 extends in the protruding direction of the first protruding plate portion 11b, and the other connecting member 17 extends in the protruding direction of the second protruding plate portion 11c.

  Each connecting member 17 is formed with a pair of holes 17a and 17a penetrating in the vertical direction. Bolts 38 (shown in FIG. 7) to be described later are inserted into the holes 17a.

  Next, the usage method and fixing method of the cross-sectional defect | deletion member 1 comprised as mentioned above are demonstrated. FIG. 4 is a plan view of a state where the cross-section defect member 1 is fixed to the precast concrete member 101, and shows a first use state of the cross-section defect member 1. The outer wall surface of the concrete structure 100 is indicated by imaginary lines, and a decorative joint 100a is provided on the outer wall surface. The makeup joint 100a extends vertically, and a plurality of makeup joints 100a are provided at intervals in the horizontal direction. A sealing material is embedded in the decorative joint 100a.

  A horizontal rebar A and a vertical rebar B are provided as structural reinforcing bars in a portion near the outer wall surface of the concrete structure 100. Since the concrete structure 100 is thick, there is a portion without a reinforcing bar in the central portion in the thickness direction. Moreover, the induction joint material 110 is being fixed to the structural reinforcing bars A and B in the part corresponding to the makeup joint 100a. The induction joint material 110 extends in the vertical direction along the joint joint 100a.

  In this embodiment, the cross-sectional defect member 1 is provided in the central portion in the thickness direction of the concrete structure 100. The direction of the cross-sectional defect member 1 is such that the extending direction of the first and second extending members 13 and 15 is along the thickness direction of the concrete structure 100. Moreover, the front end side of the 1st and 2nd extending | stretching members 13 and 15 is the direction which faces the makeup joint 100a. That is, the cross-sectional defect member 1 is arranged so that the first and second extending members 13 and 15 are positioned on a virtual straight line connecting the decorative joints 100a on both sides in the thickness direction.

  As shown in FIGS. 5 to 7, the cross-sectional defect member 1 is fixed to the prestressed concrete member 101 by using bolts (fasteners) 102 and upper and lower nuts 103 and 105 to be self-supporting. Self-supporting means maintaining a substantially vertical state without being fixed to the structural reinforcing bars A and B.

  The bolt 102 is a so-called dimensioned bolt, and has a vertically extending posture. The lower side is embedded in the precast concrete member 101 together with the anchor so as not to rotate. The upper side of the bolt 102 is a portion constituting a screw shaft 102a (shown only in FIG. 6) protruding upward from the upper surface of the precast concrete member 101.

  The lower nut 105 is screwed into the lower portion of the screw shaft 102 a of the bolt 102, and then the screw shaft 102 a is inserted into the fixing hole 20 a of the base portion 20, so that the base portion 20 is placed on the lower nut 105. Placed on. Thereafter, the upper nut 103 is screwed onto the screw shaft 102a, and the base portion 20 is fastened and fixed to the screw shaft 102a by the upper and lower nuts 103 and 105.

  The height of the base portion 20 can be finely adjusted by the screwing positions of the upper and lower nuts 103 and 105 with respect to the screw shaft 102a. At this time, the vicinity of the four corner portions of the base portion 20 is fastened and fixed to the screw shaft 102a by the upper and lower nuts 103 and 105, respectively, so that the heights of the base portion 20 near the four corner portions are individually changed. it can. Thereby, the inclination of the cross-sectional defect member main body 10 can be adjusted. In this embodiment, the cross-sectional defect member main body 10 is set to be vertical.

  Further, as shown in FIG. 7, another cross-sectional defect member 30 can be added to the top of the cross-sectional defect member 1. The cross-sectional defect member 30 has the same column 31 and extending members 33 and 35 as the cross-sectional defect member 1. In addition, a connection member 36 that is fastened and fixed to the connection member 17 of the cross-sectional defect member 1 is provided below the cross-sectional defect member 30. The connection member 17 of the cross-sectional defect member 1 is fastened and fixed to the connection member 36 of the cross-section defect member 30 by bolts 38 and nuts 39. Further, a connection member 37 for fastening and fixing another cross-sectional defect member (not shown) to the upper part of the cross-sectional defect member 30 is provided on the upper part of the cross-sectional defect member 30. By setting it as such a structure, even when the height of the concrete structure 100 is high, it can respond.

  After the concrete is placed, the concrete structure 100 as shown in FIG. 8 is obtained by solidifying. The water blocking materials 13c and 15c of the cross-sectional defect member 1 are bonded and integrated with the mortar. In FIG. 8, the structural reinforcing bars A and B are omitted.

  In addition, a cross-sectional defect occurs in the concrete structure 100 due to the cross-sectional defect member 1. At this time, as can be seen from FIG. 4, the cracks reach the induced joint material 110 starting from the distal ends of the first and second extending members 13 and 15 of the cross-section defect member 1 and are generated on the decorative joint 100 a. To do. After cracks have occurred, water may infiltrate from the cracked part, but since there are water-stopping materials 13c and 15c at the starting point of the cracks in the concrete structure 100, water penetrates deep into the concrete structure 100. Can be prevented.

  As described above, according to the cross-sectional defect member 1 according to this embodiment, the cross-sectional defect member main body 10 is fixed to the precast concrete member 101 via the base portion 20, so There is no need to fix the missing member 1 and no temporary material is required. Therefore, even if it is the concrete structure 100 of a large cross section, it becomes possible to make the cross-section defect | deletion member 1 self-supporting near the thickness direction center. Moreover, even if it is an overcrowded reinforcement or an unreinforced structure, it becomes possible to make the cross-section defect | deletion member 1 self-supported in a predetermined position. Thereby, a crack can be induced to the concrete structure 100 with a large cross section as intended.

  Moreover, since the extending members 13 and 15 extending in the thickness direction of the concrete structure 100 are provided, the crack can be reliably guided to a desired portion of the concrete structure 100.

  Further, since the bolt 102 of the precast concrete member 101 is inserted into the fixing hole 20a of the base portion 20 and fastened and fixed, the cross-sectional defect member 1 can be securely fixed to a predetermined position of the precast concrete member 101. it can.

  In addition, since a plurality of fixing holes 20a are provided in the base portion 20 and the bolts 102 of the pre-cast concrete member 101 are fastened and fixed to the fixing holes 20a, the angle adjustment is performed so that the cross-sectional defect member main body 10 becomes vertical. And cracks can be reliably guided to a desired portion of the concrete structure 100.

  Further, since the lower part of the other sectional defect member 30 is fastened and fixed to the upper part of the sectional defect member main body 10, the sectional defect members 1 and 30 corresponding to the height of the concrete structure 100 can be easily obtained. Can be built.

  Moreover, since the water-stopping materials 13c and 15c are provided in the cross-section defect member main body 10, the water that has entered from the cracked portion can be prevented from reaching deep inside the concrete structure 100, and water corrosion is suppressed. it can.

  FIG. 9 shows a second usage state of the cross-sectional defect member 1. In the second use state, the thickness of the concrete structure 100 is thicker than that in the first use state. To cope with this, the reinforcing bar fixing type cross-sectional defect member 120 is provided in the present invention. It is used with such a cross-sectional defect member 1. The cross-sectional defect member 120 is laminated on the fixed plate portion 120a fixed to the structural reinforcing bars A and B, the extended plate portion 120b extending from the fixed plate portion 120a to the inside in the thickness direction of the concrete structure 100, and the extended plate portion 120b. And a water stop material 120c. The extending plate portion 120 b is located on an extension line of the first and second extending members 13 and 15 of the cross-sectional defect member 1.

  10 and 11 show a third usage state of the cross-sectional defect member 1. In the third use state, the thickness of the concrete structure 100 is thicker than that in the first use state, and the cross-sectional defect member 1 is set to 2 in the thickness direction of the concrete structure 100 to correspond to this. Are arranged side by side. The first and second extending members 13 and 15 of each cross-sectional defect member 1 are arranged so as to be located on the same straight line. Three or more cross-sectional defect members 1 may be provided side by side in the thickness direction of the concrete structure 100.

  Moreover, as shown in FIG. 12, the cross-section defect member 1 can also be used in a concrete structure 100 of overcrowded reinforcing bars in which structural reinforcing bars A, B, and C are disposed in an overcrowded state.

  Moreover, you may make the cross-sectional shape of the support | pillar 11 of the cross-sectional defect | deletion member 1 into a substantially H type like the modification 1 shown in FIG. In the modification 1, the 1st and 2nd side board parts 11d and 11e are provided in the width direction both sides of the main board part 11a of the support | pillar 11. As shown in FIG. Thereby, the support | pillar 11 can be fixed to the base part 20 in the still more stable state.

  Moreover, you may make the cross-sectional shape of the support | pillar 11 of the cross-sectional defect | deletion member 1 into substantially U shape like the modification 2 shown in FIG. In the modification 2, the 2nd protrusion board part 11c of the support | pillar 11 is abbreviate | omitted, and the protrusion board part 11f which protrudes in the same direction as the 1st protrusion board part 11b is provided.

  Moreover, you may make the support | pillar 11 of the cross-sectional defect | deletion member 1 into a steel pipe like the modification 3 shown in FIG. The cross-sectional shape of the steel pipe is not limited to a circle. Further, the connecting member 17 can be omitted.

  Moreover, like the modification 4 shown in FIG.16 and FIG.17, the plate 40 extended horizontally may be embedded in the precast concrete member 101, and the cross-section defect | deletion member 1 may be fixed to the plate 40 by welding. Protruding portions 41 and 41 that function as anchors are provided on the lower surface of the plate 40.

  Further, as in Modification 5 shown in FIGS. 18 and 19, the plate 40 to which the dimensioning bolt 42 is fixed is embedded in the pre-cast concrete member 101, and the sectional defect member 1 is embedded in the plate 40 with the dimensioning bolt 42 and the nut. You may make it fix with 43.

  20 and 21, a vertically extending plate 44 is embedded in the precast concrete member 101, and the cross-section defect member 1 is welded to the plate 44, or a bolt and nut (not shown). ) May be fixed.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the cross-sectional defect member according to the present invention can be used for a concrete structure having a large cross section, for example.

DESCRIPTION OF SYMBOLS 1 Cross-section defect member 10 Cross-section defect member main body 11 Support | pillar 13 1st extending | stretching member 13c Water stop material 15 2nd extending member 15c Water stop material 17 Connection member 20 Base part 20a Fastener 100 Concrete structure 101 Precast concrete member 102 Bolt ( Fastener)
102a Screw shaft 103 Upper nut 105 Lower nut

Claims (3)

In cross-sectional defect members that are embedded in concrete structures and cause cross-sectional defects,
A strut extending in the vertical direction, a stretching member joined to the strut and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which a lower end portion of the strut is fixed,
A cross-sectional defect member, wherein the base portion is fixed to a precast concrete member, and the support column and the extending member are self-supporting. In the method of using a cross-section defect member that is embedded in a concrete structure and causes a cross-section defect,
A cross-sectional defect member comprising a column extending in the vertical direction, an extending member bonded to the column and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which the lower end of the column is fixed is prepared. ,
A method of using a cross-sectional defect member, wherein the base portion is fixed to a precast concrete member and the support column and the extending member are used independently. In a fixing method of a cross-sectional defect member that is embedded in a concrete structure and causes a cross-sectional defect,
A cross-sectional defect member comprising a column extending in the vertical direction, an extending member bonded to the column and extending in the thickness direction of the concrete structure, and a base portion made of a plate material to which the lower end of the column is fixed is prepared. ,
A method of fixing a cross-sectional defect member, wherein the base portion is fixed to a member embedded in a precast concrete member, and the support column and the extending member are made to stand independently.

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