KR200341968Y1 - A mixed expansion joint structure - Google Patents

Abstract

The present invention relates to a flexible joint material of a bridge having a high fluidity in the longitudinal direction, such as a waterway bridge, and to form a first flexible joint material including a water-expandable index member and a joint filler between the spaced joint parts, and to the first flexible joint material. In addition, the present invention relates to a hybrid expansion joint structure in which a second expansion joint member, which is a stretch index member having high elongation at break, is attached to the base surface which is finished to cover the joint portion by using an adhesive.

Description

A mixed expansion joint structure

The present invention relates to a hybrid expansion joint structure. More specifically, the present invention relates to a flexible joint of a bridge having a high fluidity in a longitudinal direction, such as a waterway bridge, wherein a first flexible joint including a water-expandable index member and a joint filler is formed between the spaced joints, and the first flexible joint is formed on the first flexible joint. In addition, the present invention relates to a hybrid expansion joint structure in which a second expansion joint member, which is a stretch index member having high elongation at break, is adhered using an epoxy mortar adhesive to a base surface finished to cover the joint part.

Bridge structures are usually concrete structures, which are constructed by temperature variations, creep and shrinkage, elastic shrinkage due to pre-stressing, length deformation due to traffic loads, construction errors and other influences. It is specified in various specifications to install expansion joints to absorb them in connection with structural stability. This is because when the length deformation is constrained, a large horizontal force may occur in the concrete structure, and thus stable driving of the structure cannot be maintained. Specifically, in the case of bridge structures, the design deformations including length deformation due to temperature change, length deformation due to concrete creep and dry shrinkage, length deformation due to bending due to live load, and length deformation due to vehicle load and construction occurring during construction In order to secure the proper clearance of joint part in consideration of the deformation amount, etc., various specifications are provided to accommodate the length deformation of the newly constructed concrete structure and to install expansion joint material to prevent leakage of the joint part. .

In particular, in the case of a waterway bridge, which is one of the bridge structures, the main purpose of the expansion joint material is to install the absorption of the length strain due to temperature change.

In the development process of the present invention, the clearance required by the expansion joint is quantitatively required to secure a 20mm joint part clearance every 40m in length, and a 25mm joint clearance clearance is required every 50m in length. there was. Therefore, in the present design, the cutting work for maintaining the installation interval and securing the clearance of the appropriate channel can be preceded in the new and conventional waterway bridges for securing the joint portion clearance.

Looking at the installation method of the new expansion joints damaged in the concrete conventional waterway bridge

Figure 1a shows a sequence of the expansion joint method using a copper index plate or PVC index plate in order.

The overall process of copper index plate or PVC index plate is almost similar, and there is a difference between using copper product or PVC product only as index plate. First, the copper index plates or PVC index plates 10a and 20a installed by chipping the deteriorated concrete base surface B of the joint part J, which are leaks, are removed. Since the base surface removed by chipping may have contaminants on the surface, after high pressure washing, mortar 30 is applied to the chipped base surface to remove the unevenness, and a new copper index plate or PVC index plate (10b, 20b) is tightened. Fixing and installing a new position in the conventional position using the (40), the joint filler (Joint filler, 50) is installed on the water stop (chip stop) including the chipped joint portion, the cross-sectional recovery mortar (60) on the chipped site The work is completed by the method of filling and finishing the process. Especially, in case of aqueduct bridge, contraction and inflation are repeatedly generated even by one day crossing, but the index plate is not contracted (restored) even after elongation by expansion of aqueduct bridge. It is low, so it is not suitable to use as a new expansion joint of aqueduct bridge, and PVC index plate has the advantages of no corrosion, light weight and low price. B. When used in expansion joints with large changes in length, PVC index plates are often damaged, causing a lot of defects, and they are likely to be separated from the ground surface due to the lack of adhesion when fixed to the ground surface by long-walled steel. It was pointed out that the PVC index plate lost its flexibility when shrinking.

Figure 1b is a cross-sectional view of the installation of the expansion joint material by the structure of the joint structure using the anchor and the pressing plate of the Utility Model No. 286645, first after processing the ground surface by chipping and grinding work, the joint filler 70 and the polymer mortar After reinforcing the base surface B on which the index plate is installed using 80a, install the chemical anchor 90 to fix the index plate 20b, and attach the index plate to the caulk anchor with the iron plate 100. And the chipping surface is filled with the polymer mortar 80b, and the sealant 110 is injected into the joint portion so that the index plate 20b can be securely installed on the base surface.

Figure 1c illustrates the installation process of the expansion joint using the EVAAZ (EVAZOTE) product, inserting the eva resort 120 to the joint (J) of the expansion joint is installed existing index plate (20b) using an adhesive , Is the way to install.

The EVA resort 120 has properties that are suitable for a waterway bridge with a large change in length due to high elongation and recovery rate, but because the product price is high, it is uneconomical and uses a method of directly indexing only the joint part. It was pointed out that additional supplementary work was needed.

The purpose of the present invention is to secure the high elongation rate required in the joint part where the length change of the concrete structure is large due to the environmental conditions such as the temperature difference, such as a waterway bridge, and to ensure the secure adhesion with the ground surface. It is to provide expansion joint material of concrete structure that can secure the function as index material.

1A, 1B, 1C, and 1D show a specific example of a conventional expansion joint and aqueduct bridge,

Figure 2 illustrates a hybrid expansion joint structure of the present invention,

Figures 3a, 3b, 3c and 3d are shown in order the process of installing the hybrid expansion joint material of the present invention on the chipped base surface,

4A, 4B, 4C, and 4D sequentially show a process of installing the hybrid expansion joint material of the present invention on a treated base surface per line.

<Description of Major Reference Signs>

200: first expansion joint material 210: water expansion index

230: Backup material 240: Sealant

300: second expansion joint material

400: (epoxy mortar) adhesive

In order to achieve the technical task of the present invention, the gap between the joints formed between the concrete structures can be secured appropriately (by cutting, etc.), and then the base surface is processed by chipping or grinding. In the spaced joint part, the first expansion joint member 200 including the water-expandable index member 210 and the joint filler 220 is installed to index the joint part J primarily, and the high joint surface is high on the newly formed base surface. A second stretch index 300 including a stretch index material having a high elongation at break capable of absorbing the length deformation amount is installed to cover the joint portion J on which the first stretch joint material is installed, and the second stretch index It is characterized by using the epoxy mortar adhesive 400 so that the ash can be firmly attached to the base surface, can be easily carried out by those of ordinary skill in the art. Best embodiments of the present invention will be described in detail with reference to FIGS.

The composite expansion joint structure of the present invention is a first expansion joint member 200 formed between the spaced joints J in a joint part of a concrete structure having a base surface that is finished after grinding or finishing after grinding with a single-sided recovery material. ); And a second expansion joint member 300 formed on the base surface to cover the gaped joint part, and FIG. 2 illustrates the base surface B on which the first expansion joint member and the second expansion joint member are installed.

The first expansion joint material 200 has a water-expansion index 210 is formed in the joint portion (J) by the backup agent 230 and the sealant 240, the base surface (B) to cover the joint portion It can be seen that the second expansion joint material 300 is provided by an adhesive 400 (preferably using an epoxy mortar adhesive). The basic expansion joint installation process can be applied in various ways according to the deterioration state of the concrete surface of the concrete structure. In this design, the base surface is vulnerable to chipping and the base surface is not vulnerable. Let's look into the case of the installation of the jointed material, and based on the case that is installed in the waterway bridge with a large length of deformation due to the temperature difference.

<In case of chipping treatment due to weak base surface>

The aqueduct bridge 500 is a kind of hydraulic structure in which the channel 520 is supported by the channel support 530 on the pier 510 as shown in FIG. 1D. The channel structure of the U-shaped cross-section of the open top of the channel is mainly used, and the pier supports the channel 510, which is a box structure, at a lower portion with a predetermined interval and is installed at a predetermined height due to ground conditions. The water channel is also made according to the length of the bridge piers also has a predetermined length is connected to the bridge, it is usually manufactured in the field with a concrete structure, such as a bridge.

Concrete structures deteriorate over time due to various reasons, and expand and contract according to environmental factors (temperature differences, etc.). As the concrete expands and contracts, the length of the channel, which is the concrete structure, increases and decreases, so that the change in the length of the channel is cumulative when the function of the free end of the channel support becomes inoperable.

In response to the length change, a predetermined gap is formed between concrete structures continuously formed as a water channel so that expansion and contraction of the concrete structure due to the length change can be accommodated. It is called part (J).

In the joint part, as shown in FIGS. 1A to 1C, expansion joints such as installing the index plates 10a, 20a, 20b, and 20b and filling the index plates with mortar are made, and when the index plates lose their function, the joints Leakage is generated in the parts, which causes deterioration of concrete structures such as reinforcing corrosion formed inside the concrete structure, and it is necessary to replace the damaged index plate with a new index plate because it has a great effect on the durability of the waterway bridge.

This expansion joint replacement work is preceded by the first step of removing the concrete structure, if the base surface is deteriorated.

In other words, the damaged concrete base surface is removed by chipping. In FIG. 3A, the parts to be chipped from the concrete structure A to the site where the existing index plate 20b is installed are shown as hatched portions, and the proper joint portion J clearance distance is not secured so that both concrete structures closely adhere to each other. It can be seen that. This lack of clearance distance leads to the occurrence of defects in the channel due to expansion and contraction of the concrete structure. In this design, the damaged index plate is removed after chipping, and the end of the concrete structure is secured to secure an appropriate clearance distance D as shown in FIG. 3b. Cutting It is preferable that the clearance distance due to the guttering ensures that 20-25 mm is secured in the case of the channel length of 40-50 m.

Since the chipping surface may be formed with a lot of irregularities and contaminants may exist, the chipping surface may be treated by high pressure washing or sand blasting.

When a new faceted surface is formed, the joint part is first filled with back-up (230) material. The backup material is used to adjust the depth of the water expansion index 210 (joint portion up and down depth in FIG. 3B) installed in the joint portion or to move or settle in the joint portion when the water expansion index member described below is installed. As it is installed to prevent it to be formed at a predetermined height in the lower part of the joint. Such a backup material is not necessarily a component to be installed, but by installing it, the installation position of the water-expandable index material described later and after completion of construction may prevent movement and settlement.

The water expansion index 210 of the present invention is formed on the backup material. The water-expandable index agent is a rubber material, which has a first exponential function of the joint part by rubber elasticity, and a material having a second exponential function by volume expansion when contacted with water so as to have a more reliable index performance. When such a material is used, the elasticity and the resilience are good enough to secure a function as an index material, it is installed in the joint portion so as not to protrude to the base surface (B) chipped on the backup material as shown in FIG.

When the water-expandable index agent 210 is formed, a joint filler 220 is installed as shown in FIG. 3B to protrude slightly above the new base surface B2 including the chipped and removed portion thereof. The joint filler has a function of absorbing the amount of change in length due to expansion and contraction of the concrete structure even when the recovery mortar is filled in the chipped portion.

After the joint filler is installed, the chipped portion is repaired by filling with a non-shrinkage high strength mortar (M) as a cross-sectional recovery material. In this case, a portion of the joint pillar protruding from the newly formed base surface B2 formed by the recovered chipping part is formed to have a slight step so that the second expansion joint material, which will be described later, is installed.

Accordingly, the upper end of the joint filler 220 protruding from the base surface B2 is cut from the newly formed base surface to a slightly lower portion as shown in FIG. 1C. This is to secure a space for forming the sealant 240 to be described later.

The sealant 240 is formed on the top of the jaw filler cut at the upper end to form a newly formed base surface B2. The sealant is a moisture-curable material having a high elasticity, so that the second expansion joint member 300 installed on the newly formed base surface having excellent adhesive strength to concrete, mortar, and the like may cover the upper part of the joint filler 220. In other words, the upper end of the joint filler 210 may be easily attached to the second expansion joint material 300 which will be described later.

After the sealant 240 is formed, the second expansion joint member 300 of the present invention, which is a stretch index member, is attached to the newly formed base surface such that the center portion of the joint filler is positioned at the upper end of the joint filler as shown in FIG. 3D. The second expansion joint material 300 is a kind of index plate having a very high elongation at break, which is different from the conventional one in that it is attached to the base surface B2 of the concrete structure. In the related art, such an index plate is formed in the concrete structure as shown in FIGS. 1A to 1C, thereby easily being damaged by the expansion and contraction caused by the change of the length of the concrete structure. There was a problem of losing its function as an index material.

In the present invention, the conventional joint part is provided with the first expansion joint material 200 including the above-described water expansion index agent and the joint filler, and the newly formed base surface B2 has a large length due to expansion and contraction, like a waterway bridge. By installing the second expansion joint material 300, which is a stretch index material made of a material having a high elongation at break that can absorb the change amount, the expansion and contraction of the concrete structure, such as a waterway bridge, is severe, so that even when the clearance distance of the joint is largely formed. It is possible to fully achieve the function of the expansion joint material installed in the joint portion.

The second expansion joint material 300 is securely attached to the upper part of the joint filler 220 by the sealant 240, and in the present invention, the adhesive 400 is previously mounted on the base surface B2 for attachment to the base surface B2. In the present invention, the epoxy mortar adhesive is used as the adhesive.

Accordingly, the second expansion joint material 300 may be reliably attached to the newly formed base surface B2, and unlike the conventional art, the second expansion joint member 300 does not use a caulk anchor, and thus has excellent construction properties.

The second expansion joint material 300 is attached to have a width slightly smaller than the width of the base surface formed with a step, and the thickness thereof is also equal to or slightly smaller than the thickness of the newly formed base surface. This has the function of applying the epoxy mortar adhesive 400 again on the second expansion joint material 300 so that it can be finished to the same height as the surrounding base surface, and the second expansion joint material is exposed to the outside to prevent damage easily. .

Thus, the expansion joint material of the present invention through the hybrid of the first expansion joint member 300, including the water expansion index agent and the joint filler installed in the joint portion and the second expansion joint member 300, which is a stretch index agent having a high elongation at break It is possible to function as an optimal expansion joint material that can absorb the expansion and contraction of the exponential and concrete structures in the large joint part like the aqueduct bridge. It is preferable to use a masking tape when necessary for a smooth finish of the base surface.

<When the expansion joint of the present invention is installed after grinding work because the surface is not fragile>

4 is a diagram illustrating a process of installing the first expansion joint material 200 and the second expansion joint material 300 according to the present invention when the existing base surface of the concrete structure is good and no separate chipping operation is required.

Even if it is not necessary to chip first, if the base surface is somewhat damaged, as shown in FIG. 4A, the base surface B3 is newly formed through grinding as shown in FIG. 4A, but the step may be slightly attached so that the second expansion joint member 300, which will be described later, is attached. To form.

Furthermore, as described above, the end of the concrete structure may be cut so that the necessary joint part clearance distance D may be secured, thereby sufficiently securing the clearance distance of the joint part corresponding to the length change due to the temperature difference such as a waterway bridge. Even in this case, the clearance between the gutters is such that 20-25 mm can be secured for channel lengths of 40-50 m.

At this time, if the existing index plate 20b is not damaged, it does not need to be removed. High pressure washing or sandblasting may be performed to remove contaminants on the newly formed base surface by the grinding operation, and a backup material 230 is installed as shown in FIG. 4B in an appropriately spaced joint. 4 illustrates a case in which the backup material 230 is installed on the index plate without removing the existing index plate.

The above-described water expansion index 210 is provided on the backup material, and the sealant 240 described above is also formed thereon. Adhesive (400, epoxy mortar adhesive is used) is applied on the new base surface B3 on which the sealant is formed, and the second expansion joint member 300 of the present invention covers the joint portion J in FIG. Install it together. Finally, as shown in FIG. 4d, the epoxy mortar adhesive 400 is formed on the second expansion joint material 300 to finish the installation of the expansion joint material of the present invention.

Hybrid expansion joint material of the present invention is to cut the end of the concrete structure so that the clearance distance is sufficiently secured, and even if a large clearance distance is formed, the joint portion includes a water-expandable index first to serve as a sufficient expansion joint material The expansion joint is installed, and the newly finished base surface is provided with the second expansion joint having a high elongation at break, so that the expansion joint is suitable for a waterway bridge having a large length change due to temperature difference.

Claims (9)

In the joint part of a concrete structure having a base surface finished after chipping or finishing with a sectional recovery material, A first expansion joint formed between the spaced joint part; And And a second expansion joint material formed on the base surface to cover the spaced joint portion. The first expansion joint member of claim 1, wherein the first expansion joint member having a base surface finished with the cross-sectional recovery material after chipping is formed. A water-expandable index member formed at the spaced joint portion; And And a joint filler formed on the water-expandable index member and inside the cross-sectional recovery material, wherein the second expansion joint member is formed on the base surface to cover the joint filler. The hybrid expansion joint structure according to claim 2, wherein the water-expandable index member is formed on a backup material formed in advance in the spaced joint portion. The hybrid expansion joint structure according to claim 2, wherein a sealant is further formed between the joint filler and the second expansion joint material. The hybrid expansion joint structure according to claim 2, wherein the second expansion joint member is attached to the base surface by an adhesive, and the second expansion joint member is finished by the adhesive on the attached second expansion joint member. The first expansion joint member of claim 1, wherein the first expansion joint member having the finished surface after grinding is expanded. A backup material formed at the spaced joint portion; And a water-expandable index member formed on the backing member and formed in the spaced joint portion; And a second expansion joint member formed on the base surface to cover the water expansion index member. The hybrid expansion joint structure according to claim 6, wherein a sealant is further formed between the water-expandable index member and the second expansion joint member. The hybrid expansion joint structure according to claim 6, wherein the second expansion joint member is attached to the base surface by an adhesive, and the second expansion joint member is finished by the adhesive on the attached second expansion joint member. The hybrid expansion joint structure according to claim 5 or 8, wherein the adhesive is an epoxy mortar adhesive.