JP6286300B2 - Construction method of joint structure and concrete structure - Google Patents

Description

  The present invention relates to a joint structure and a construction method for a concrete structure.

The joint portion (joint portion) of the concrete structure is provided for each predetermined extension for the purpose of preventing cracking due to drying shrinkage or uneven settlement of the concrete.
In such a joint part, joint materials interposed between concrete members and a water stop plate disposed across the concrete members may be used in combination.

In a joint portion of a concrete structure, it is common to construct the other concrete member after constructing one concrete member.
At this time, the joint material is attached to the end face of one of the concrete members after the construction, but the water stop plate has the other end side so that one end side is embedded in the concrete member when constructing one concrete member. It was common to fix to a formwork using a binding wire or a clamp.

However, since the water stop plate has flexibility, it may be deformed by pressure or the like at the time of placing concrete. If the water stoppage is deformed when placing concrete, an unfilled portion of concrete may occur.
Therefore, in Patent Document 1, as shown in FIG. 6, the concrete 130 in a state where the water stop plate 110 is held by a plate-shaped water stop plate holder 120 disposed so as to be bridged between the concrete members. A construction method for laying out is disclosed.

JP 2013-256816 A

Since the water stop plate holder 120 of Patent Document 1 is fixed to the mold 150, it could not be used when a pair of concrete members facing each other with the joint portion interposed therebetween are constructed at the same time.
Moreover, since the water stop board holder 120 is comprised by the metal members, there exists a possibility that the deformation | transformation performance of the water stop board which is a flexible member may be reduced.

  The present invention aims to solve the above-mentioned problems, and even when a pair of concrete members facing each other with the joint portion interposed therebetween are constructed at the same time, the water stop plate is securely fixed, And it makes it a subject to propose the construction method of the joint structure and concrete structure which enabled construction with high quality.

  In order to solve the above-described problems, the joint structure of the present invention includes a joint material interposed between the abutting surfaces of the concrete members, and a water stop plate horizontally placed between the concrete members. One end portion of the water stop plate is fixed to a reinforcing bar of the one concrete member via an attachment member, and the other end portion of the water stop plate is connected to the other end via the attachment member. It is characterized by being fixed to the reinforcing bar of the concrete member.

  According to this joint structure, since both ends of the water stop plate are fixed to the reinforcing bars of the concrete members through the attachment members, the water stop plate can be securely attached even when the concrete member is constructed at the same time. It can be fixed and the concrete structure can be constructed with high quality.

  The joint material may be sandwiched between a pressing member fixed to a reinforcing bar of one concrete member and a pressing member fixed to the reinforcing bar of the other concrete member.

  Furthermore, if the mounting member is provided with the pressing member, the fixing of the water stop plate and the fixing of the joint material can be performed by one mounting member. Compared to this, it is excellent in workability and economical.

  The method for constructing a concrete structure according to the present invention includes a step of arranging reinforcing bars of a pair of concrete members facing each other with a joint part interposed therebetween, and a joint material by using a pressing member fixed to the reinforcing bars. Fixing the waterstop plate to the reinforcing bar using an attachment member fixed to the reinforcing bar, installing the mold, and placing concrete in the mold It is characterized by having.

  According to such a construction method of a concrete structure, even when a concrete member is constructed at the same time, the water stop plate and the joint material can be securely fixed, and thus the concrete structure can be constructed with high quality. Can do.

  According to the construction method of the joint structure and concrete structure of the present invention, even when a pair of concrete members facing each other with the joint portion interposed therebetween are constructed at the same time, the water stop plate is securely fixed and high quality is achieved. It becomes possible to construct it.

It is sectional drawing which shows the joint structure of this embodiment. It is a perspective view which shows the concrete structure of this embodiment. It is a perspective view which shows a part of joint structure of FIG. (A) And (b) is sectional drawing which shows each procedure of the construction method of the concrete structure of this embodiment. (A) And (b) is sectional drawing which shows each procedure of the construction method of the concrete structure following (b) of FIG. It is sectional drawing which shows the construction method of the conventional concrete structure.

As shown in FIG. 1, the joint structure 1 of the present embodiment includes a water stop plate 3 laid horizontally between the concrete members 21 and 22, and a joint material 4 interposed between the butt surfaces of the concrete members 21 and 22. And.
Reinforcing bars 23, 23 are arranged on the concrete members 21, 22 along the outer surface side and the inner surface side of the concrete members 21, 22. In addition, the concrete members 21 and 22 do not necessarily need to be arranged in two stages.

The joint structure 1 of this embodiment is formed in the joint part (joint part) 20 of the concrete structure 2, as shown in FIG.
In this embodiment, a case where a box culvert is constructed as the concrete structure 2 will be described. However, the concrete structure 2 is not limited to the box culvert, and may be a retaining wall, for example.

The water stop plate 3 is composed of a rubber plate, and is disposed across the concrete members 21 and 22 in the vicinity of the center in the thickness direction of the concrete members 21 and 22, as shown in FIG.
The water stop plate 3 includes a cylindrical portion 30 formed in a horseshoe cross section, and blade portions 31 and 32 extending from the cylindrical portion 30 to the left and right.
In addition, the material which comprises the water stop board 3 is not limited to a rubber plate, For example, a PVC water stop board may be sufficient. Further, the shape of the water stop plate 3 is not limited.

The cylindrical portion 30 is disposed in the joint portion 20 (between the concrete members 21 and 22) of the concrete structure 2. That is, a part of the cylindrical portion 30 is exposed from the end surfaces of the concrete members 21 and 22.
In addition, the shape of the cylindrical part 30 is not limited.

One blade portion 31 of the water blocking plate 3 is embedded in one concrete member 21. An end portion of the blade portion 31 is fixed to the reinforcing bar 23 of one concrete member 21 through the attachment member 5.
The other blade portion 32 of the water blocking plate 3 is embedded in the other concrete member 22. The end portion of the blade portion 32 is fixed to the reinforcing bar 23 of the other concrete member 22 through the attachment member 5.

  The blades 31 and 32 are formed with ridges 33 and 34 for enhancing adhesion to concrete. In addition, the shape of the protrusions 33 and 34 is not limited, For example, a cross-sectional semicircle shape may be sufficient and a cross-sectional trapezoid shape may be sufficient.

The attachment member 5 of this embodiment includes a reinforcing bar fixing part 51, a waterstop fixing part 52, and a connecting part 53.
The reinforcing bar fixing portion 51 is fixed to the reinforcing bar 23. In this embodiment, the reinforcing bar fixing part 51 is fixed to the reinforcing bars 23 inside the concrete members 21 and 22, but the reinforcing bar fixing part 51 may be fixed to the outer reinforcing bar 23.

  The reinforcing bar fixing portion 51 is a member formed in a U shape as shown in FIG. Bolts 54 are inserted through a pair of opposing plate portions in the reinforcing bar fixing portion 51. When the bolt 54 is tightened in a state where the reinforcing bar 23 and the connecting part 53 are inserted into the reinforcing bar fixing part 51, the reinforcing bar 23 and the connecting part 53 are gripped by the reinforcing bar fixing part 51.

One end of the water stop plate fixing portion 52 is fixed to the end portion of the water stop plate 3. A connecting portion 53 is fixed to the other end of the water stop plate fixing portion 52.
The water stop plate fixing portion 52 of the present embodiment is formed of a rectangular steel plate, and is fixed to the water stop plate 3 by tightening a screw 55 penetrating the water stop plate 3 and the water stop plate fixing portion 52. Has been.

The waterstop fixing part 52 is parallel to the reinforcing bar 23 to which the reinforcing bar fixing part 51 is fixed.
In addition, the fixing method of the water stop plate 3 and the water stop plate fixing part 52 is not limited, and may be clamped by a clip or the like, for example. Moreover, the material which comprises the water stop plate fixing | fixed part 52, the shape of the water stop plate fixing | fixed part 52, etc. are not limited.

The connecting portion 53 connects the reinforcing bar fixing portion 51 and the water stop plate fixing portion 52.
The connecting portion 53 is formed by bending a steel bar into an L shape at a substantially right angle, and includes a first piece 53a and a second piece 53b. In the mounting member 5, the water stop plate fixing portion 52 and the connecting portion 53 have a U shape in plan view.

  The second piece 53 b is a portion along the reinforcing bar 23, and is held together with the reinforcing bar 23 by the reinforcing bar fixing portion 51 in a state of being superimposed on the reinforcing bar 23. The first piece 53 a has a right angle with the reinforcing bar 23.

The tip of the first piece 53 a is welded to the water stop plate fixing portion 52. The water stop plate fixing portion 52 is perpendicular to the first piece 53a (that is, parallel to the second piece 53b).
In the present embodiment, the tip of the second piece 53b (the end opposite to the first piece 53a) is threaded. The pressing member 6 is screwed to the male thread portion of the second piece 53b.

  The joint material 4 is a so-called expansion joint material that prevents the concrete members 21 and 22 from cracking by absorbing the shrinkage and expansion of the concrete members 21 and 22. In the present embodiment, a resin foam or an asphalt plate member is used as the joint material 4, but the material constituting the joint material 4 is not limited. Moreover, the thickness of the joint material 4 will not be limited if it is a magnitude | size which can absorb the shrinkage | contraction etc. of the concrete members 21 and 22. FIG.

As shown in FIG. 1, the joint material 4 is disposed along the circumferential direction of the concrete members 21 and 22 in a state where the joint material 4 is in contact with the end surfaces of the concrete members 21 and 22.
In this embodiment, the joint material 4 is arrange | positioned at the outer surface side (upper side in FIG. 1) and the inner surface side (lower side in FIG. 1) of the concrete members 21 and 22, respectively. More specifically, the pair of joint materials 4 and 4 are disposed so as to face each other with the cylindrical portion 30 of the water stop plate 3 interposed therebetween.

The outer joint material 41, which is the joint material 4 disposed on the outer surface side, has an outer end (upper end in FIG. 1) exposed on the outer surface of the concrete member 2 and an inner end (in FIG. 1). The lower end) is in contact with the water stop plate 3.
The inner joint material 42, which is the joint material 4 disposed on the inner surface side, has an outer end in contact with the water blocking plate 3 and an inner end exposed on the inner surface of the concrete member 2.

  The outer joint material 41 has a smaller width (length in the vertical direction in FIG. 1) than the inner joint material 42. The shape dimensions of the joint material 4 are not limited, and the outer joint material 41 and the inner joint material 42 may have the same shape.

The joint material 4 is sandwiched between a pair of pressing members 6 and 6.
The pressing member 6 includes a main body portion 61 that is a cone member made of a cement-based material, and a bolt receiving portion 62 that is formed integrally with the main body portion 61.

  The pressing member 6 is arranged so as not to interfere with the reinforcing bar 23. Although this embodiment demonstrates the case where the whole press member 6 is arrange | positioned in the part (part on the outer side (joint side) rather than the reinforcing bar 23) without the reinforcing bar 23, the pressing member 6 does not necessarily have the reinforcing bar 23. There is no need to be placed in the part. The shape of the pressing member 6 may prevent the pressing member 6 and the reinforcing bar 23 from interfering with each other.

  The main body 61 is formed in a truncated cone shape, and the distal end surface (contact surface with the joint material 4) has a flat surface. Further, a bolt receiving portion 62 is formed on the base end surface (the end surface opposite to the joint material 4) of the main body portion 61.

The pair of pressing members 6, 6 sandwich the joint material 4. The front end surface of the main body 61 is in contact with the plate surface of the joint material 4.
In addition, the material which comprises the main-body part 61, and the shape of the main-body part 61 are not limited.

  The bolt receiving part 62 is configured by a high nut fixed to the base end face of the main body part 61. The bolt receiver 62 is screwed to the male screw portion of the second piece 53b. In addition, the structure (formation method) of the bolt receiving part 62 is not limited.

  The outer joint material 41 is sandwiched between pressing members 6 and 6 (hereinafter referred to as “outer pressing member 6a”) fixed to the reinforcing bars 23 arranged on the outer side, and the inner joint material 42 is arranged on the inner side. It is clamped by pressing members 6 and 6 (hereinafter referred to as “inner pressing member 6b”) fixed to the rebar 23.

The outer pressing member 6 a is fixed to the reinforcing bar 23 by screwing a bolt receiving portion 62 to an adjustment bolt 63 fixed to the reinforcing bar 23.
The adjustment bolt 63 is constituted by a so-called dimensioning bolt (full screw), and is fixed to the reinforcing bar 23 via a fixing jig 64.

  In this embodiment, the linear adjustment bolt 63 is used. However, when the entire pressing member 6 is not disposed outside the reinforcing bar 23, the pressing member 6 and the reinforcing bar do not interfere with each other. In addition, the adjustment bolt 63 may be bent. For example, the adjustment bolt 63 may be bent in a crank shape.

  The fixing jig 64 is a member formed in a U-shape as shown in FIG. Bolts 65 are inserted through a pair of opposing plate portions of the fixing jig 64. When the bolt 65 is tightened in a state where the reinforcing bar 23 and the adjusting bolt 63 are inserted into the fixing jig 64, the reinforcing bar 23 and the adjusting bolt 63 are gripped by the fixing jig 64. In the present embodiment, the same type of member is used as the fixing jig 64 and the reinforcing bar fixing portion 51 of the attachment member 5, but the fixing jig 64 and the reinforcing bar fixing portion 51 may be different members.

  The outer pressing member 6 a moves forward and backward along the adjustment bolt 63 by rotating around the axis of the adjustment bolt 63.

The inner pressing member 6 b is fixed to the reinforcing bar 23 by screwing the bolt receiving portion 62 to the connecting member 53 (second piece 53 b) of the mounting member 5.
When the pressing member 6 is rotated around the axis of the second piece 53b, the pressing member 6 advances and retreats along the second piece 53b. The inner pressing member 6 b may be fixed to the reinforcing bar 23 separately from the mounting member 5 using the adjusting bolt 63.

  In the present embodiment, the linear second piece 53b is used, but when the entire pressing member 6 is not disposed outside the reinforcing bar 23, the pressing member 6 and the reinforcing bar do not interfere with each other. As such, the second piece 53b may be bent. For example, the second piece 53b may be wound in a crank shape.

Next, the construction method of the concrete structure provided with the joint structure 1 will be described.
The construction method of a concrete structure includes a bar arrangement process, a first joint material fixing process, a waterstop fixing process, a second joint material fixing process, a formwork process, and a placing process. .

As shown in FIG. 4A, the bar arrangement step is a step of arranging the reinforcing bars 23 and 23 of the pair of concrete members 21 and 22 that are opposed to each other with the joint portion 20 interposed therebetween.
In the present embodiment, the horizontal bars 23a and the vertical bars 23b are arranged in a lattice pattern on the outer surface side and the inner surface side of the concrete members 21 and 22, respectively, but the arrangement and pitch of the reinforcing bars 23 are not limited.

As shown in FIG. 4B, the first joint material fixing step is a step of fixing the outer joint material 41 to the reinforcing bar 23 using the outer pressing member 6a.
In the first joint fixing step, first, the outer pressing member 6 a is fixed to the outer reinforcing bar, and then the outer pressing member 6 a is advanced toward the outer joint member 41. When the outer joint member 41 is sandwiched between the outer pressing members 6a and 6a facing each other with the outer joint member 41 interposed therebetween, the outer joint member 41 is fixed to the reinforcing bar 23 through the outer pressing members 6a and 6a.
At this time, an outer mold 71 may be installed.

The water stop plate fixing step is a step of fixing the water stop plate 3 as shown in FIG.
In the water stop plate fixing step, first, the attachment member 5 is fixed to the inner reinforcing bar 23, and then the water stop plate 3 is fixed to the water stop plate fixing portion 52.
The water stop plate 3 is fixed to the reinforcing bar 23 by being fixed to the water stop plate fixing portion 52 of the attachment member 5. In addition, after fixing the water stop plate 3 to the water stop plate fixing portion 52, the attachment member 5 may be fixed to the reinforcing bar 23.

As shown in FIG. 5B, the second joint material fixing step is a step of fixing the inner joint material 42 to the reinforcing bar 23 using the inner pressing member 6b.
In the second joint material fixing step, first, the inner pressing member 6 b is fixed to the connecting portion 53 of the mounting member 5, and then the inner pressing member 6 b is advanced toward the inner joint material 42. When the inner joint member 42 is sandwiched between the inner pressing members 6b and 6b facing each other with the inner joint member 42 interposed therebetween, the inner joint member 42 is fixed to the reinforcing bar 23 via the inner pressing members 6b and 6b (attachment portion eye 5). . Note that the inner pressing member 6b may be screwed to the connecting portion 53 in advance.

The formwork step is a step of installing the formwork 7 as shown in FIG.
According to the shape of the concrete members 21 and 22, a pair of formwork members 71 and 72 are arranged at a predetermined interval.

The placing step is a step of placing concrete in the mold 7 (between a pair of mold members 71 and 72). Concrete is placed on both sides of the joint 20.
Once the concrete is cured, the mold 7 is removed as shown in FIG.

According to the joint structure 1 of the present embodiment, the both ends of the water stop plate 3 are fixed to the reinforcing bars 23 of the concrete members 21 and 22 via the attachment members 5 and 5, respectively. Even if it is a case where it constructs simultaneously, the water stop board 3 does not move.
Therefore, the workability of the joint portion 20 of the concrete structure 2 is improved, and the durability of the concrete structure 2 is also improved.

  Since the water stop plate 3 is not deformed by the flow pressure of the concrete, an unfilled portion resulting from the deformation of the water stop plate 3 does not occur, and the concrete structure 2 can be constructed with high quality.

  Moreover, even when the water stop plate 3 is installed almost horizontally, such as a bottom plate or a slab, the water stop plate can be fixed at an angle at which air can be removed, so that the construction is performed with high quality. be able to.

Moreover, since the joint material 4 is clamped by the pressing members 6 and 6, it can be reliably fixed to a desired position, and the concrete structure 2 can be constructed with high quality.
Since the pressing member 6 is formed of a cement-based material, it is possible to prevent foreign substances such as metal from entering the pure fog.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

Although the said embodiment demonstrated the case where a water stop plate was fixed with the attachment member fixed to the inner reinforcement, the reinforcement which fixes an attachment member is not limited.
Moreover, although the said embodiment demonstrated the case where an attachment member was fixed to a horizontal stripe, you may fix an attachment member to a vertical stripe.
The number and arrangement of the attachment members and the pressing members are not limited and may be set as appropriate.

In the above embodiment, the case where the outer joint material and the inner joint material are fixed in two stages of the first joint material fixing step and the second joint material fixing step has been described. However, the outer joint material and the inner joint material are described. It is not always necessary to separate the two steps.
Further, the order of the first joint material fixing step, the second joint material fixing step, and the waterstop plate fixing step (the order of the step of fixing the joint material and the step of fixing the waterstop plate) is the same as the order of the embodiment. It is not limited.

1 Joint structure 2 Concrete structure 20 Joint part (joint part)
DESCRIPTION OF SYMBOLS 21 One concrete member 22 The other concrete member 23 Reinforcing bar 3 Water stoppage 4 Joint material 5 Mounting member 6 Pressing member 7 Formwork

Claims (4)

A joint structure comprising a joint material interposed between the abutting surfaces of the concrete members, and a water stop plate horizontally placed between the concrete members,
One end of the water stop plate is fixed to a reinforcing bar of one of the concrete members via an attachment member,
The joint structure, wherein the other end of the water stop plate is fixed to a reinforcing bar of the other concrete member via an attachment member. The joint material is sandwiched between a pair of pressing members,
One of the pressing members is fixed to a reinforcing bar of the one concrete member,
The joint structure according to claim 1, wherein the other pressing member is fixed to a reinforcing bar of the other concrete member.   The joint structure according to claim 2, wherein the attachment member includes the pressing member. Arranging the reinforcing bars of a pair of concrete members facing each other across the joint,
A step of fixing a joint material to the reinforcing bar using a pressing member fixed to the reinforcing bar;
A step of fixing a water stop plate to the reinforcing bar using an attachment member fixed to the reinforcing bar;
The process of installing the formwork;
And a step of placing concrete in the mold, and a method for constructing a concrete structure.

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