JP3318688B2 - Construction method of telescopic joint and buried object used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an expandable joint for setting an expandable joint at a joint of cast concrete and a buried object used in the method.

[0002]

2. Description of the Related Art As is well known, there is a case where concrete is poured on the floor of a building to install concrete between floors.

[0003]

By the way, when a large-scale building is used and the area of the concrete is increased, when the poured concrete is solidified and dried, the concrete shrinks and cracks are generated. May propagate to the entire surface of concrete. Therefore, various countermeasures are taken based on the finish, unevenness, and construction status of the slab concrete. However, there is no definitive measure yet, and a construction method that can completely prevent the propagation of cracks has been desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of constructing an expansion joint capable of effectively preventing the propagation of cracks and a buried object used in the method. I do.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a method of constructing an expansion joint is to install a buried object at a position corresponding to a concrete joint to be cast adjacently, and then to partition both areas by the buried object. A method of constructing a telescopic joint by casting concrete, wherein the buried object is a partition extending along the joint, and an anchor extending from one side of the partition in a direction intersecting with the joint. A sheath extending from the other side of the partition in a direction intersecting with the joint.The sheath is disposed at a position corresponding to the joint, and then the two partitions separated by the partition are provided. Concrete is cast in the region, and the anchor part and the sheath part are buried in the concrete, and the upper part of the partition part is exposed.

The buried object according to the present invention is a buried object buried at a position corresponding to a joint of concrete to be cast adjacently, and a partition extending along the joint and one of the partitions. Extending from the side in a direction intersecting with the joint,
An anchor portion embedded in concrete and a sheath portion extending from the other side surface of the partition portion in a direction intersecting the joint and embedded in concrete.

The buried object is formed of a plate-like member having a lower portion of the partition portion supported on the ground, and the anchor portion is formed of a rod-like member held at a right angle to one side surface of the plate-like member. It is preferable that the sheath portion comprises a rod-like member held at a substantially right angle to the other side surface of the plate-like member and a coating layer formed on at least the surface of the rod-like member and made of a material to which concrete hardly adheres.

[0008]

According to the method for constructing an expansion joint according to the present invention, the buried object is placed at a position corresponding to the joint of the joint, and then concrete is poured into both areas divided by the divider. The anchor part and the sheath part of the buried object are buried in the concrete, and the upper part of the partition part is exposed.

Thus, the poured concrete is partitioned into two adjacent regions by the upper part of the partition of the buried object, and the concrete in one region is fixed to the buried object via the anchor portion, and the other is fixed to the buried object. The concrete in the area is installed movably with respect to the buried object through the sheath portion. Therefore, when the concrete shrinks due to solidification and drying, the concrete moves relative to the sheath,
It is slightly away from the partition, which causes cracks to be concentrated along the partition. As described above, by concentrating the cracks at the partition portions, the cracks caused by the contraction of the concrete can be prevented from propagating to the entire surface of the concrete.

In addition, since the partitioning portion of the buried object functions as a concrete stopper form, there is no need to separately install a concrete stopper form, and furthermore, the concrete part in which the anchor portion and the sheath portion of the buried object are cast. Since it functions as a slip bar for preventing a step from occurring at the joint, there is no need to separately install a slip bar, and from these facts, it is possible to improve the productivity in construction.

According to the buried object of the present invention, a partition extending along the joint, an anchor extending from one side of the partition in a direction intersecting with the joint, and embedded in concrete, And a sheath portion extending from the other side surface of the shape portion in a direction intersecting the joint, and being buried in the concrete. The concrete in one area is fixed to the buried object via the anchor part, and the concrete in the other area is installed movably with respect to the buried object via the sheath part. When contracted with
The concrete relatively moves at the sheath portion and is slightly separated from the partition portion, whereby cracks are intensively generated along the partition portion, and it is possible to prevent cracks due to concrete shrinkage from propagating to the entire surface of the concrete. Moreover, since the partitioning part of the buried object functions as a concrete stopper form, there is no need to separately install a concrete stopper form, and furthermore, since the anchor part and the sheath part of the buried object function as a so-called slip bar, There is no need to install a slip bar, and from these facts, productivity in construction can be improved.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a buried object according to an embodiment of the present invention.

The buried object 1 of this embodiment has a plate-like member (corresponding to a partition portion) 2 extending along the joint of the concrete to be cast adjacently, and one side surface 2a of the plate-like member 2. A bar-shaped member (corresponding to an anchor portion) 3 held by welding or the like at a substantially right angle, and a bar member 4 held by welding or the like at a substantially right angle on the other side surface 2b of the plate-shaped member 2. Further, a leg portion 6 that stably holds the plate-shaped member 2 so as to be vertical is attached to a lower portion of the plate-shaped member 2. Further, a coating layer (for example, a paint layer such as paint) 5 made of a material to which concrete does not easily adhere is provided on the surface of the rod-shaped member 4 and the side surface 2b on which the rod-shaped member 4 is held. The rod-shaped member 4 and the coating layer 5 provided on the surface of the rod-shaped member 4 constitute a sheath portion of the present invention.

Next, with reference to FIGS. 2 and 3, a method of constructing an expansion joint using the buried object 1 of this embodiment will be described.

Pillars 11 are erected at predetermined spans on the earth concrete 7, 8 constructed using the construction method of the present embodiment. As shown in FIG. 3, a support layer (for example, a piece of rubble stone spread and compacted) 9 is provided on the ground on which the pillars 11 are erected.

Next, on the upper surface of the support layer 9,
Is placed, and the plate-like member 2 of the buried object 1 is arranged so as to be located in a vertical plane. In this state, the rod members 3 and 4 held by the plate member 2 are arranged substantially parallel to the upper surface of the support layer 9.

Next, a support layer 9 is provided above the rod members 3 and 4.
The reinforcing mesh 12 is set in parallel with the upper surface of the plate member and exposing the upper part of the plate-shaped member 2. Then, concrete is poured into both areas partitioned by the buried object 1 to form the concrete between the soil 7 and 8. At this time, by adjusting the amount of concrete to be poured, the upper part of the plate-like member 2 is slightly protruded from the upper surface of the concrete-soil 7, 8 so that the concrete-soil 7, 8 is divided by the upper part of the projecting plate-like member 2. So that

Then, after a grid-shaped cutter joint 10 is formed on the upper surface of the cast concrete, the concrete is solidified to complete the earth concretes 7 and 8.
At this time, the poured concrete is partitioned into two adjacent areas by the upper part of the plate-like member 2 of the buried object 1, and the interstitial concrete 7 in one area is fixed to the buried object 1 via the rod-shaped member 3, The slab concrete 8 in the other area is disposed on the buried object 1 via the side surface 2b of the bar-shaped member 4 and the plate-shaped member 2. However, the bar-shaped member 4 and the side surface 2b are coated with a material to which concrete hardly adheres. Since the layer 5 is formed, the slab concrete 8 is installed movably relative to the buried object 1.

Therefore, when the cast concrete shrinks due to solidification and drying, the slab concrete 8 retreats from the rod-shaped member 4 and the side surface 2b, and slightly separates from the plate-like member 2, whereby the plate-like member 2 Cracks occur intensively along the side surface 2b. In this way, by concentrating the cracks on the side surface 2b of the plate-like member 2, it is possible to reduce the stress acting on other portions due to the contraction of the concrete, thereby preventing the cracks from propagating to the entire surface of the concrete. .

In addition, since the plate-like member 2 of the buried object 1 functions as a concrete stopper form, there is no need to separately install a concrete stopper form, and further, the rod-like members 3 and 4 and the coating layer 5 of the buried object 1 are provided. Can function as a so-called slip bar, so that a step can be prevented from occurring at the joint portion of the cast concrete, and there is an advantage that it is not necessary to separately install a slip bar. From these things, the productivity in construction can be remarkably improved.

In the above embodiment, the buried object 1 having the specific shape described above is used. However, any shape can be adopted as long as the object of the present invention can be achieved.

Further, in the above-described embodiment, the present invention is used in the case of constructing earth concrete, but can be applied to the case of constructing a floor surface or a wall surface of a structure such as a basement.

[0023]

As described above, according to the method of constructing an expansion joint according to the present invention, a buried object is installed at a position corresponding to a joint of concrete to be cast adjacent to the joint, and then partitioned by the buried object. A method for constructing an expansion joint for placing concrete in both areas, wherein the buried object extends in a direction intersecting the joint from one side surface of the partition and the partition extending along the joint. An anchor portion and a sheath portion extending from the other side surface of the partition portion in a direction intersecting with the joint are provided, and the partition portion of the buried object is installed at a position corresponding to the joint, and then the partition portion Concrete is poured into both partitioned areas, and the anchor portion and the sheath portion are buried in the concrete and the upper portion of the partition portion is exposed. When it is accompanied by contraction in the reduction and drying,
By generating cracks intensively along the partition, cracks due to concrete shrinkage can be prevented from propagating to the entire surface of the concrete, and the buried object functions as a concrete stopper form and a slip bar. Can also improve productivity.

According to the buried object of the present invention, the partition extending along the joint, the anchor extending from one side of the partition in a direction intersecting with the joint and embedded in the concrete, Since it is provided with a sheath portion extending from the other side surface of the shape portion in a direction intersecting with the joint and buried in the concrete, when contracted due to solidification and drying of the concrete, cracks are formed along the partition portion. Intensive generation prevents cracks caused by concrete shrinkage from propagating to the entire surface of the concrete, and furthermore, improves the productivity in construction because the buried object functions as a concrete stopper form and a slip bar. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embedded object according to an embodiment of the present invention.

FIG. 2 is a plan view showing soil concrete constructed using the method for constructing an expansion joint according to one embodiment of the present invention.

FIG. 3 is a view as viewed in the direction of the arrow II in FIG. 2;

FIG. 4 is a view taken in the direction of the arrow in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 embedded object 2 plate-shaped member (partition part) 3 rod-shaped member (anchor part) 4 rod-shaped member (sheath part) 5 coating layer (sheath part)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04B 1/62-1/92 E04F 15/14 E04D 11/00

Claims (3)

(57) [Claims] 1. A method for constructing an expansion joint, comprising: installing a buried object at a position corresponding to a joint of concrete to be cast adjacently, and then pouring concrete into both areas partitioned by the buried object. A buried object, a partition extending along the joint, an anchor extending from one side of the partition in a direction intersecting the joint, and a direction intersecting the joint from the other side of the partition. And a sheath portion extending to the joint, the partition portion of the buried object is installed at a position corresponding to the joint,
Next, concrete is poured into both regions partitioned by the partition portion, and the anchor portion and the sheath portion are buried in the concrete and the upper portion of the partition portion is exposed. Construction method of expansion joint. 2. A buried object buried at a position corresponding to a concrete joint to be cast adjacently, wherein the partition extends along the joint, and the joint is formed from one side surface of the partition. An anchor portion extending in a direction intersecting and embedded in concrete, and a sheath portion extending in a direction intersecting with the joint from the other side surface of the partition portion and embedded in concrete. A buried object used in the method for constructing an expansion joint according to claim 1. 3. A lower portion of the partition portion is made of a plate-like member supported on the ground, the anchor portion is made of a rod-like member held at a right angle to one side surface of the plate-like member, and the sheath portion is 3. The burying device according to claim 2, comprising a rod-like member held substantially at right angles to the other side surface of said plate-like member, and a coating layer formed on at least the surface of said rod-like member and made of a material to which concrete does not easily adhere. object.