JPS6363842A - Shrinking joint material using polymer absorbing body - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shrink joint material using an absorbent polymer, and more specifically, a polymer that can arbitrarily change the defect rate and make the presence of joints less noticeable. This invention relates to a shrink joint material using an absorbent material.

[Prior Art and its Problems] Conventionally, shrinkage joints have been used as a countermeasure against shrinkage cracks in concrete walls such as rigid frame walls.

For large walls, it is preferable to have many contraction joints, and for walls without openings, make 6 joints at 1.5 m 5 degrees from the center of the pillar or at the edge of the pillar, and furthermore, create contraction joints at intervals of about 2 to 3 positions to form walls. It is said that it is better to make it public.

Such shrinkage joints are ■eyes! 'I! ! Attach the rod to the formwork. ■ Exterior (Erecting the I11 formwork ■ Arranging the formwork ■ Erecting the indoor formwork (in some cases, no joint bars are provided)
→C) Placing concrete → ■ Curing ■ Demolding the formwork = 60) Remove the joint rod ■ Cleaning the joint area = 60 Paste backup material or pound breaker sticker m@ [After pasting the raw tape, injecting the sealant = 60: Peeling off the A raw tape] It is formed through the following steps.

The defect rate of walls with shrinkage joints formed in this way can be expressed as defect hJ rate=joint inspection/wall thickness, and by reducing this defect rate to 1/4 to 115, the concrete wall The resulting convergence stress concentrates on the defective part, causing cracks to occur at the joint locations.

However, if the building is built without attaching joint material to the formwork on the indoor side in (■), the g ground inspection will become large in order to satisfy the specified loss rate, but the electric point for ensuring cover (reinforcement protection) will Since the joint inspection cannot be done as thoroughly as possible, the defect rate is insufficient, and it is difficult to reliably introduce cracks into the joint positions. The joint width must be at least 20 mm because the sealant is injected after applying the rough boiled curing tape.
Approximately mm is required. Therefore, from a design standpoint, there is a problem in that joints cannot be provided at all, or the positions where they can be provided are restricted.

[Objective of the invention] The present invention provides a polymer absorbent material that can arbitrarily change the defect rate, make the presence of joints less noticeable, solve problems with design, and maintain the effect of shrinkage joints over a long period of time. The purpose is to provide a shrink joint material that uses

[Means for Solving the Problems] The present inventor has made extensive studies to achieve the above object, and as a result, has arrived at the present invention.

That is, in the shrinkable joint material using the polymer absorber according to the present invention, an edge portion is formed in the vertical direction of a pipe having a part fixed to concrete, and the polymer absorber is formed in the hollow part of the pipe. It is characterized by being stored.

In a preferred embodiment of the present invention, the fixing portion to the concrete is formed by bending at a predetermined angle at a position perpendicular to the edge cut or on the same side as the water ingress side, and the edge cut is formed on the outside of the pipe. A pair of protrusions are provided along both ends of the holder.

[Effect] It is estimated that the diameter of the pipe in which the polymer absorber is housed has the same effect as damage caused by joints. The rate can be changed arbitrarily. In addition, in the cases shown in Figures 1 and 3, which will be described later, there is no need to increase the joint width, so the presence of the joint can be made inconspicuous, and shrinkage joints using polymeric absorbent material can be used without any design problems. We can provide materials. In addition, since the polymer absorber is housed in the hollow part of the pipe, water will not be absorbed from the concrete when the concrete hardens, and the properties of the polymer absorber will not deteriorate due to alkaline absorption. If the pipe is exposed to the indoor side and left open so that the polymer absorber can be pulled out or inserted from the upper and lower ends, water can be drained from the lower end of the pipe or the lower end of the pipe can be removed. Since the polymer absorber can be pulled out from the pipe and inserted from the upper end of the pipe, maintenance etc. can be easily performed. Therefore, the effect of the contraction joint can be maintained for a long period of time.

Conventionally, the technology of using polymer absorbers as anchoring pieces is as follows:
Although it is described in JP-A No. 80-141941, Go-119840, and Utility Model Application No. 59-122308, in all of them, the performance of the polymer absorber deteriorates significantly, and maintenance of the polymer absorber is difficult or The drawback is that it cannot be done.

Furthermore, Japanese Patent Application Laid-Open No. 80-152749 describes a technology related to a water stop plate for cracks in the outer wall, but the effect is limited to simply stopping water, and it is also possible to introduce water into the pipe and absorb it as in the present invention. If this is not possible, there is a disadvantage that the water cannot be drained.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is a schematic sectional view showing the first embodiment of the present invention, and FIG.
The figure is a schematic sectional view showing an example of the state of use of the shrinkage joint material shown in the above embodiment.

In the first IA, 1 is a shrink joint material using a polymer absorber. 2 is a pipe made of resin (eg, vinyl chloride, vinyl acetate, polycarbonate, etc.).

Note that the cross-sectional shape is preferably a perfect circle as shown in the figure, but is not necessarily limited to this.

3 is an edge portion formed in the vertical direction of the pipe 2. 4
．． Reference numeral 4 denotes a pair of protrusions extending along both ends of the edge cutting portion 3.

5 is a polymer absorber housed in the hollow part of the pipe 2. The polymer absorber 5 has the property of swelling when it absorbs water, and is usually housed in the hollow portion of the pipe 2 approximately in the center so as to have a space 2A as shown in the figure. As the polymer absorber 5, a superabsorbent resin described in Japanese Patent Application No. 81187/1987 can be used.

6 is formed at a position perpendicular to the edge cutting portion 3 or bent at a predetermined angle toward the water entry side. It is a fixing part that fixes to concrete, and from the viewpoint of water-stopping effect, it is preferable to provide it on both sides of the edge cutting part 3 as shown in the figure, but it is not limited thereto.

The anchoring section 6 is preferably formed of a plate-shaped body from the viewpoint of water-stopping effect, and from the viewpoint of anchoring to concrete, a plurality of branch members 6A may be attached. Since the object of the present invention can be achieved if it is effective, a rod-shaped body can also be used. In that case, a plurality of rod-shaped bodies can be used in the vertical direction and formed in a lattice shape together with the branch member 6A.

To embed and fix the above shrinkage joint material l in the concrete wall 7, ■ Attach the shrinkage joint material l to the built-in external formwork■fi! , A moment of reflection - Erecting the formwork on the inside of the room.
[Co., Ltd.] It is formed through a simple process of 10 casting concrete, 10 curing, 10 shrinking joint material, and removing the formwork.

When attaching the shrinkage joint material 1 to the built-in external formwork, attach the tip of the protrusion 4.4 to the external formwork, and remove 5! As shown in Figure 1, the tip of the protrusion 4.4 is connected to the concrete wall 7.
It is preferable to match the outer surface 7A of the outer surface 7A.

The loss rate of shrinkage joint material 1 fixed in this way is as follows: concrete g! If the thickness of the pipe 7 is d2, and the distance from the tip of the protruding parts 4, 4 to the rear end position of the pipe 2 is dl, then dl is obtained.Therefore, dfl of the protruding parts 4, 4 corresponding to the joint width
By appropriately setting the diameter of the pipe without increasing A d 3, the required defect rate k can be determined. Also d
3 can be made smaller, and by matching the color of the protrusions 4, 4 with the color of the concrete or finishing material, it can be made less noticeable.

The shrinkage joint material l of this example, in which the loss rate k has been appropriately determined, is a place where shrinkage stress caused by drying shrinkage of concrete is concentrated, so as shown in FIG. It is possible to forcibly form an opening 8 corresponding to a crack 9 between the pair of protrusions 4.4 by pulling each of them outward. The water entering from the opening 8 is absorbed by the polymer absorbent body 5, and the body of the polymer absorbent body 5 swells.

If the pipe is laid so that its upper and lower ends are exposed to the indoor side and left open so that the polymer absorber 5 can be pulled out or inserted from the upper and lower ends, wood can be discharged from the lower end of the pipe. Alternatively, the polymer absorber can be pulled out from the lower end of the pipe and inserted from the upper end of the pipe, making maintenance etc. easy. The effect of the contraction joint can be maintained over a long period of time.

This absorption and expansion of the polymer absorber 5 has the effect of preventing water leakage into the cracks 9 that occur on the indoor side of the contraction joints. That is, to explain in detail the mechanism for preventing water leakage, if a crack 9 occurs on the indoor side with a width of fl, for example, in the open part 8 introduced and generated due to the effect of the joint, the gap f2 between the protruding parts on the outside side is approximately equal to fl, and it is considered that cracks have been replaced. Regarding this part, water that enters from the outside is absorbed by the polymer absorber and does not leak into the interior.In addition, water that enters from the outside is absorbed by the polymer absorber and does not leak into the interior. It is also possible that water goes around and intrudes, but in this case, the polymer absorber inside the pipe is simultaneously expanding due to the intruding water from the protrusion, so the expansion pressure is applied through the pipe material. Water leakage can be prevented by closing the gap.

Note that it is also preferable to provide a convex portion 10 in order to specify the formation position of the crack 9. As a means for forming the convex portion IO,
It is preferable that the contact surface 10A between the pipe 2 and the convex fi11to is not adhesively bonded, but the side surface of the convex part is fixed using, for example, tape 10B.This maximizes the chipping rate at the tip mA-B of the convex part. Therefore, there is a high probability that a crack will be introduced between the convex tips EA and B. If a crack occurs between the convex light AA and B, the convex part has a tendency to break due to zero span tension. Since the pipe 2 and the convex part 10 are edged, the pipe 2 will not be destroyed due to zero span tension due to the occurrence of cracks. By gluing the molded material of this convex part 10, it is possible to more reliably prevent the pipe 2 from being damaged. Cracks can occur and the mechanism described above for water leakage disease can be activated.

X is a horizontal stripe, and y is a vertical stripe.

Example 2 FIG. 3 is a schematic cross-sectional view showing the second example, and shows the case where the contraction joint material is buried in the wall (between the external reinforcing bars and the internal reinforcing bars). It seems that dl when finding N=k'L can be expressed as shown in the figure. Therefore, even though there are no externally visible joints,
Predetermined deficit -1! k, and functions as a contraction joint.

There are no external joints, so there are no problems with the design (the complicated work associated with conventional contraction joints can be reduced to Daifuku).

To install the contraction joint material of this example, after the external formwork is erected, the contraction joint material of the present invention is temporarily fixed between the external reinforcing bars and the internal reinforcing bars after reinforcing or reinforcing. Next, the formwork for the indoor side is erected, concrete is poured, and seedlings are produced.The installation of the shrinkage joint material is then completed by removing the formwork.

Therefore, in conventional joint materials, the joint rod is removed and the joint g!
l? I'l cleaning, back up material or pound breaker
There is no need to apply a seal or inject sealant. However, it is necessary to take measures to prevent rust from reinforcing the walls on the outside. In other words, deformed reinforcing bars are usually used for wall reinforcement, and if cracks occur in the vertical direction due to contraction joints, water and air will mainly reach the horizontal reinforcements X, causing problems such as water leakage and corrosion of the reinforcing bars (horizontal reinforcements X). will occur. For this reason, it is necessary to take measures to prevent the reinforcing bars from rusting, and for example, it is preferable to provide a coating part zt with epoxy resin on the horizontal reinforcement Therefore, in other parts, it is thought that cracks are more likely to be introduced at the joint position l because the transverse reinforcement X restrains the contraction of the concrete.

Note that in the embodiment shown in FIG. 3, when burying a pipe, it is not necessarily limited to the vertical direction;
For inverted figure-8 (lower floors) or figure-8 (near the top floor) diagonal cracks that often occur in C-frame buildings, diagonal ( By embedding V-IV in an inverted figure-eight shape for lower floors and a figure-eight shape for upper floors, it is possible to reliably prevent these diagonal cracks, which were previously considered to be extremely difficult to prevent with vertical contraction joints. Position (pipe position 71)
can be installed to prevent water leakage through cracks.

Embodiment 3 FIG. 4 is a schematic sectional view showing a third embodiment, in which a conventional contractile joint filler and a contraction joint filler of the present invention are used together.

In the figure, 11 is a conventional joint material. A sealing material (not shown) or the like is injected into this joint material. If sealing is not used, it is preferable to coat the horizontal stripes with epoxy as shown in FIG.

The missing rate in this example is It can be expressed as Note that d4 is the thickness of the conventional joint material +1.

Shrinkage joint material in this example) To install wood 9. The light shrinkage joint material 1 can be weired in the same manner as in Example 2, and the joint material 11 can be attached using the conventional method.If appropriate anti-rust measures can be taken for the horizontal stripes on the outside, the conventional joint material 11 can be formed. In this case, the injection process of sealant can be omitted, or it can be filled with mortar to create hidden joints.

In the case of this example, a crack 12 occurs between the joint material 11 and the pipe 2, and a crack 9 occurs in the wall portion on the indoor side from the pipe 2, and water leakage from the crack 12 is guided to the polymer absorbent material 5 and absorbed. , the polymer absorbent body 5 swells. In this case, it is preferable to sharpen the tip of the protruding portion 4 in order to identify the location of the crack.
It is also preferable to provide a similar convex portion.

Embodiment 4 No. 5'rA is a schematic cross-sectional view of the main part showing the fourth embodiment, and shows the installation of contraction joints in this embodiment. The positions and procedures are the same as in the first embodiment.

The fixing part 6 in this embodiment is formed by bending the tip of the protruding part 4 as shown in the figure, and the bent surface 6B is formed to match the outer wall surface 7A, and the bent end 6C is further inserted into the wall. It is preferable that it be bent; in other words, if this shape is used, the presence of joints will be more noticeable than in Example 1, but it will be better in introducing cracks and in filling concrete.

[Effects of the Invention] According to the present invention, the defect rate can be arbitrarily changed by combining specifications such as the diameter and shape of the pipe and the presence or absence of a protrusion. In addition, since there is no need to increase the joint width, the existence of the joint can be made inconspicuous and there is no need to open the design.Also, since the polymer absorber is stored in the hollow part of the pipe, water is absorbed from the concrete when the concrete hardens. is not carried out,
There is no deterioration in the performance of the polymer absorber due to alkaline absorption.

Furthermore, if the upper and lower ends of the pipe are left open and the polymer absorber is exposed so that it can be pulled out or inserted from the upper and lower ends, water can be drained from the lower end of the pipe, or polymer absorbers can be removed from the lower end of the pipe. The absorber can be pulled out and the polymer absorber can be inserted from the top end of the pipe, making maintenance etc. easy. Therefore, the effect of the contraction joint can be maintained for a long period of time.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing the first embodiment of the present invention;
The figure is a schematic sectional view showing an example of the state of use of the shrinkage joint material shown in the above embodiment. FIG. 3 is a schematic cross-sectional view showing a second embodiment, in which a shrink joint material is embedded in a wall. FIG. A case is shown in which the joint filler and the shrinkable joint filler of the present invention are used together. FIG. 5 is a schematic cross-sectional view of a main part showing a fourth embodiment, and shows a case where fixing parts are provided at the tips of the protruding parts. 1: Shrinkage joint filler 2: Pipe 3: Edge section 4: Protrusion section 5: Polymer absorber 6: Anchor section 7: Concrete wall 8: Open section 9: Crack 10: Convex section 11: Conventional joint filler 12: Crack Patent Applicant Sato Kogyo Co., Ltd. Agent Patent Attorney Nobuaki Sakaguchi Figure 5

Claims (1)

[Claims] A contraction joint using a polymer absorber, characterized in that an edge section is formed in the vertical direction of a pipe having a part fixed to concrete, and a polymer absorber is housed in the hollow part of the pipe. Material.