JP5110479B2 - Member with joint material for concrete structure and construction method - Google Patents

Description

  The present invention relates to a member with joint material that is embedded in a concrete structure and prevents cracking by absorbing expansion and contraction of the concrete, and a method for constructing a concrete structure using the member with joint material. The concrete structure is applied to all structures having joints made of a material containing concrete, and can be applied to a structure using, for example, foamed concrete or a gas-filled lightweight embankment.

  If the retaining wall formed by placing concrete is integrally formed in the longitudinal direction, there is a risk of cracking due to a change in temperature or the like. Therefore, usually, for example, by interposing a joint material such as elastite at a position of every 10 m in the longitudinal direction of the concrete structure, the expansion and contraction of the concrete is absorbed to prevent cracking.

  For example, when forming a retaining wall with a total length of 30 m, install elastite at a point separated by 10 m from one side edge and at a point further separated by 10 m in the same direction from the above point. Is done. Concretely, after setting and hardening concrete in the ranges on both sides (the range from the start end to 10 m and the range from the end to 10 m) with the range of every 10 m of the total length of 30 m as the construction unit, the joint member The wooden formwork used for positioning is removed, and then concrete is placed in the center area.

  As described above, according to the above construction method and the like, it is necessary to wait for the concrete to harden in the range on both sides and to remove the wooden stop formwork. Complexity becomes a problem.

Japanese Patent Publication No. 48-23382

  Therefore, an object of the present invention is to shorten the work period and simplify the process for a concrete structure with a joint material interposed.

Therefore, the present invention is a member with joint material (2) embedded in a concrete structure, and is fixed in contact with and opposed to a base part (21) formed into a plate shape and a side surface of the base part (21). It is a member with joint material which consists of a joint material part (22) which can be expanded-contracted .

In the present invention, the base (21) is made of a material different from the joint material part (22), and is preferably a base (21) made of precast concrete, for example . As the base (21), for example, ceramics, steel, various resins, etc. can be used other than concrete.

  By installing such a member with joint material (2) in the mold frame (1) facing in the front-rear direction at a predetermined interval in the length direction, a plurality of regions (S, S) are formed in the mold frame. And concrete can be placed in multiple areas at the same time. That is, since the member with joint material (2) constitutes a permanent fixing mold that is embedded and does not need to be removed like a conventional wooden fixing mold, the construction period can be shortened and the process can be simplified. is there.

In the present invention, from the purpose of increasing the independence, lateral width of the base portion (21) is Ru can also be larger than the lateral width of the joint member (22), joint fillers (22 ) Is projected outward from the end of the base (21) so that the base (21) is not exposed to the outside of the mold (1) .

In the present invention, a column (3) is erected on the inside of the mold (1), and the member (2) with joint material is fixed to the column (3) (one side surface), and a plurality of the inside of the mold is obtained. The concrete structure is constructed by placing concrete in a plurality of areas and then embedding the pillars (3) and the jointed member (2) in the placed concrete. is there. In this construction method, concrete is placed in the plurality of regions, and the strut (3) and the member with joint material (2) are embedded in the concrete structure.

The present invention further welds the reinforcing bar (40) to the bolt (43) inserted into the hole (41) provided in the base (21) of the member with joint material (2), either directly or via a connector. This is a fixing method, and the member with joint material (2) can be fixed without using the column (3).

  According to the construction method using the member with joint material of the present invention, unlike the conventional technique, the step of removing the wooden retaining mold frame is not required, and the member with the joint material can be left as it is inside the mold frame. Therefore, it is possible to shorten the work period by constructing a plurality of sections simultaneously.

Example perspective view Example side view Example top view AA line sectional view of FIG. Cross-sectional view of another embodiment Explanatory drawing of member with joint material when fixing with rebar Partial enlarged cross-sectional view when fixing a member with joint material with a reinforcing bar Front view of the fixing plate used when fixing jointed members with reinforcing bars Front view of the fixing plate used when fixing jointed members with reinforcing bars Partial enlarged sectional view when using a fixed plate

  Hereinafter, embodiments of the present invention will be described.

(Formwork 1)
As shown in FIG. 1 etc., the formwork 1 erected oppositely through a predetermined interval is a frame for molding a concrete structure having an arbitrary shape and size. Usually, a form part having a predetermined length is connected to a required length to form one form form (front form form), and another form form (rear form form) formed in the same manner. By standing up and down in the front-rear direction at a predetermined interval, a space that is inside the mold is formed between the two, and concrete is placed in the space.

  The formwork 1 is not particularly limited as long as it is a known formwork. For example, a steel formwork made of a steel plate or a wooden made smooth by applying a release agent to one surface of a thick plywood board. A plywood form or a decorative form used for applying a pattern to the surface is preferably used.

  Note that the mold 1 is assembled on the foundation concrete by a known butterfly material, a separator or the like (not shown).

(Member with joint material 2)
As shown in FIGS. 3 and 4, the member with joint material 2 includes a base portion 21 made of concrete and a joint material portion 22 fixed to one side surface of the base portion 21. The joint material-attached member 2 is fixed to one side surface of the support column 3 erected between the molds 1 and 2, and is appropriately stacked in the vertical and horizontal directions to be connected. , S.

(Joint material part 22)
The joint material portion 22 is a joint material that absorbs deformation of the concrete in order to prevent excessive cracking based on the difference in deformation due to temperature expansion and contraction or external load in the concrete structure.

  The joint material portion 22 is not particularly limited as long as it is a known joint material. For example, a bitumen type joint plate mainly composed of asphalt, a bitumen fiber joint plate in which a fibrous material is blended with asphalt, PVC It is formed into a plate shape using other materials such as resin or rubber foam joint plate. It may be one using foamed concrete or foam mixed lightweight embankment.

  The joint material portion 22 is fixed to the base portion 21 in a state where the one side surface thereof is opposed to the one side surface of the base portion 21. Specifically, the joint material portion 22 is fixed to one side surface of the base portion 21 using a known fixing means such as a double-sided tape, a nail, or a bolt.

  The side view shape of the joint material portion 22 is formed to be the same as the side view shape of the base portion 21. For example, if the base portion 21 is square, the joint material portion 22 is also square. Of course, these shapes can be appropriately changed according to the shape of the concrete structure, and may be rectangular, trapezoidal, triangular, or the like. Moreover, in this embodiment, although the area of the side surface of the base 21 and the joint material part 22 is equal, it can also be made into a different area (other Examples mentioned later).

(Support 3)
The strut 3 may be any one that is erected and fixed inside the mold 1 and supports the jointed member 2 by sticking and fixing it, and can use reinforcing steel, steel, concrete, various resins, and the like. Although not limited to a specific structure, for example, as shown in FIG. 1 and the like, a metal L-shaped angle formed by connecting a vertical wall portion 31 and a horizontal wall portion 32 by welding is suitable.

  The column 3 and the member with joint material 2 are fixed in a state where the one side surface of the base 21 of the member 2 with joint material is opposed to one side surface of the vertical wall portion 31 of the column 3. The fixing method is not particularly limited. For example, it is preferable to form a through hole in the vertical wall portion 31 of the support column 3 and the base 21 made of concrete, insert a bolt into the through hole, and tighten and fix with a nut.

Moreover, the auxiliary | assistant support | pillar 4, such as a round bar steel, is connected with the vertical wall part 31 or / and the horizontal wall part 32 of the support | pillar 3 by welding etc. from the meaning which improves the independence. The base end of the auxiliary column 4 is fixed by welding or the like to the reinforcing bar 5 embedded in the ground at a predetermined interval from the position where the column 3 is erected in the left-right direction. The other side surface of the vertical wall portion 31 and / or the horizontal wall portion 32 is fixed by welding or the like. In addition, as shown in FIG. 1 etc., although the auxiliary | assistant support | pillar 4 is provided in the area | region S side which is the one side of the left-right direction, you may provide in the other area | region S side, and also in the area | region of the divided both sides An auxiliary column 4 may be provided.

(Construction method)
First, the column 3 is erected on the inside of the mold 1. Specifically, the base end of the pillar 3 which is L-shaped on the ground surface where the crushed stones are crushed by floor digging and ground leveling, or on the ground surface where the foundation concrete is placed, and the reinforcing bar on the foundation concrete Secure to the pile 5 and stand upright. In the present embodiment, as shown in FIG. 1, four support columns 3 are erected between the molds 1 at a predetermined interval. The column 3 is fixed to the reinforcing bar 5 protruding from the surface of the foundation concrete by welding or the like.

  Next, the concrete base 21 is fixed to the support column 3. Specifically, a plurality of through holes are drilled in the vertical wall portion 31 of the support column 3 in a vertical direction at a predetermined pitch, and a through hole communicating with the through hole is also drilled in the concrete base portion 21. Tighten with nuts through bolts so that they communicate with each other.

  The concrete base 21 may be a single concrete plate precast according to the cross-sectional shape of the concrete structure. However, in terms of ease of construction, the base 21 is composed of a plurality of parts formed in an arbitrary shape. The base 21 is preferred. For example, a plurality of parts are connected in the up / down / left / right direction, and finally constitute the cross-sectional shape of the concrete structure as a whole. Specifically, as shown in FIG. 1 and the like, two rectangular parts are arranged in the front-rear direction on the concrete foundation surface, and trapezoidal parts are arranged in the front end direction. Then, they are sequentially arranged in the upward direction.

  Next, a joint material portion 22 such as elastite is attached and fixed to the concrete base 21. Specifically, the side surface of the joint material portion 22 formed in the same shape as the side surface shape of the concrete base portion 21 fixed to the support column 3 is fixed in a state of facing and contacting the side surface of the base portion 21. As fixing means, double-sided tape, nails, bolts or the like are used.

  Next, the auxiliary column 4 is fixed to the column 3 to enhance the self-supporting property. Specifically, the tip of the auxiliary column 4 made of round steel bar is fixed to the other side surface of the vertical wall portion 31 of the column 3 by welding or the like, and the base end of the auxiliary column 4 is fixed to the reinforcing bar 5 by welding or the like. Prevents tilting and falling.

  Next, concrete is placed between the molds 1. When one jointed member 22 is arranged at the center in the length direction in a mold formed in a predetermined length to form two sections, one section is driven to a reference height and cured. Without waiting for the other section, the other section is driven continuously, or one section is driven to a predetermined height lower than the reference height, and the other section is continuously driven to the same predetermined height. In some cases, both sections are driven alternately to the same height.

  As described above, the support column 3 is erected on the inside of the mold 1 facing the front-rear direction, and the member 2 with joint material is fixed to one side surface of the support column 3 so that the inside of the mold 1 has a plurality of regions S and S. In the construction method of the concrete retaining wall in which concrete is placed in the plurality of regions S, S after partitioning into the ′, as the member 2 with joint material, a concrete base 21 formed into a plate shape, and a concrete If a material composed of a stretchable elastite or other joint material part 22 fixed in a state of being opposed to the side surface of the base part 21 is used, the jointed member 2 needs to be removed like a conventional wooden retaining mold frame. By constructing a permanent formwork that is not buried, the construction period can be shortened and the process can be simplified.

(Another embodiment of member 2 with joint material)
FIG. 5 is a cross-sectional view of another embodiment of the member 2 with joint material. The base portion 21 and the joint material portion 22 of the member with joint material 2 may have the same size, or the lateral width of the base portion 21 may be made larger or smaller than the lateral width of the joint material portion 22. In this embodiment, the lateral width of the base portion 21 is made smaller than the lateral width of the joint material portion 22, and the left and right end portions of the joint material portion 22 are sandwiched by the face tree 6 having a triangular cross section from the front and rear. Thus, it is joined to the mold 1.

  The base portion 21 has an end surface having an interval of about 3 to 10 cm between the base portion 21 and the mold frame 1. Further, the base 21 has a vertical end thickness 7 having an L-shaped cross section attached to the front side thereof. The vertical end thick is attached by a bolt 8, a nut 9, and a washer 10 that are passed through a hole that penetrates together with the base 21.

  In this embodiment, the end portion of the joint material portion 22 protrudes outward from the end portion of the base portion 21 so that the base portion 21 is not exposed to the outside of the mold 1. Therefore, when concrete is placed, the entire base portion 21 is covered with the concrete and the joint material portion 22, and there is no portion that appears on the concrete surface, so that the appearance can be improved.

(Example when fixing a member with joint material with a reinforcing bar)
In the above-described embodiment, the member 2 with joint material is fixed to the support column 3 and the support column 3 is supported by the auxiliary support column 4 (reinforcing bar). 2 can also be fixed. In this case, as shown in FIGS. 6 and 7, a hole 41 is provided in the concrete base portion 21, a washer 42 is applied between the joint material portion 22 (there may be no washer), and a bolt 43 is attached. The head 21 is inserted so that the head 22 is located on the side with the joint material 22 and the base 21 is tightened with the nut 44 on the opposite side.

  Then, a connecting bolt 46 is attached to a portion of the bolt 43 protruding from the nut 44 via a long nut 45, and the other end of the reinforcing bar 40 having one end fixed to the installation surface is welded and fixed to the connecting bolt 46. . You may weld a reinforcing bar directly to the long nut 45. The reinforcing bar 40 may be inclined and provided at one end fixed to the reinforcing bar pile 5 similarly to the auxiliary support column 4 shown in FIG. The reinforcing bars 40 may be directly welded and fixed to the bolts 43 inserted into the holes 41 without using a connecting tool such as the nut 44, the long nut 45, and the connecting bolt 46. The material of the bolt and nut can be stainless steel, iron, plastic, resin, or the like, but is not particularly limited as long as it can be fixed.

  Moreover, when fixing the reinforcing bar 40 at the joint between the plurality of members 2 with joint material, as shown in FIG. 8 and FIG. 9, it is made of iron having a hole through which the bolt 43 protruded from each member 2 with joint material passes. It is preferable to use fixing plates 47a and 47b.

  As shown in FIG. 8, a fixing plate 47a having a rectangular shape and two holes is applied to the base 21 as shown in FIG. Using the bolt 43 inserted through one of the holes, the base portion 21 can be tightened and the rebar 40 can be fixed in the same manner as described above.

In addition, at the joint between the three members with joint material 2, as shown in FIG. 9, the fixing plate 47 b having a square shape and three holes is applied to the base portion 21, and the bolts 43 are inserted through the holes, The rebar 40 can be similarly fixed using the bolt 43 inserted through one of the holes.
The shapes of the fixing plates 47a and 47b are not limited to those shown in the drawings, and the positions and number of holes can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Formwork 2 Member 21 with joint material Base 22 Joint material part 3 Support | pillar 4 Auxiliary support | pillar 40 Reinforcement 41 Hole 43 Bolt

Claims (3)

A member (2) with a joint material embedded in a concrete structure, and a base (21) formed in a plate shape and a stretchable joint material fixed in contact with the side surface of the base (21). And the end portion of the joint material portion (22) protrudes outward from the end portion of the base portion (21) so that the base portion (21) is not exposed to the outside of the formwork (1). A member with joint material , characterized by A column (3) is erected on the inside of the mold (1), and the member with joint material (2) according to claim 1 is fixed to the column (3) to partition the mold into a plurality of regions. Thereafter, concrete is placed in a plurality of areas, and the concrete structure is constructed by embedding the pillar (3) and the jointed member (2) in the placed concrete. The reinforcing bar (40) is welded to the bolt (43) inserted into the hole (41) provided in the base (21) of the member with joint material (2) according to claim 1 directly or via a connector. A method for fixing a member with joint material, characterized by fixing.

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