JP5519737B2 - Method for joining concrete structures - Google Patents

Description

  The present invention relates to a method for joining concrete structures in which a concrete structure having a cylindrical or U-shaped cross section is joined.

  Conventionally, various methods have been adopted as a method of laying a concrete structure having a cylindrical or U-shaped cross section. For example, a gasket having a water-stopping property such as corrugated rubber is attached to the outer periphery of a fitting convex portion provided at an end of a concrete product that is a concrete structure, and this is engaged with a concave portion of an existing concrete product. A method of drawing the rubber using a drawing means such as a turnbuckle and fitting the rubber into the concave portion has been considered (for example, see Patent Document 1). In addition, a groove for fitting is provided in the vicinity of the center of the plate thickness of the top plate, side wall, and bottom plate of the concrete product that is a concrete structure, and one of the belt-like rubber members having arrow shapes on both sides is provided in the groove. Embed the sagittal part using a hammer or the like, engage the other sagittal part with the fitting groove part of the adjacent concrete product, and draw it using a pulling means such as a turnbuckle, and insert this arrow part into the fitting groove part. A method is also considered in which grout is injected from a hose for injecting grout provided in a concrete product into a groove for fitting. Moreover, when performing drop construction, conventionally, the method of winding up the space | interval part between the concrete products adjacent to each other by the concrete cast in the field is adopted. Furthermore, as a method for recovering functions such as continuity and water tightness when a gap or crack occurs in an existing concrete structure, a method of attaching a flexible joint at predetermined intervals is considered.

  Thus, a method of fitting the rubber attached to the fitting convex portion provided at the end portion of the concrete product by using the pulling means such as the turnbuckle described above into the concave portion of the adjacent concrete product, or a concrete product In the method of embedding the arrow-shaped portion of the band-shaped rubber member having an arrow shape on both sides in the fitting groove provided in the structure, performance can be ensured and joined when laying the concrete product, but there is a problem that it cannot be dealt with after laying.

  In addition, the above-described method of winding up with cast-in-place concrete makes it possible to rigidly bond adjacent concrete products, making it impossible to cope with subsequent subsidence or ground displacement during an earthquake. There is a problem.

  In addition, when a flexible joint is attached at predetermined intervals to restore functions such as continuity and watertightness when an existing concrete structure is displaced or cracked as described above, Since it is extremely expensive, there is a problem that the repair cost becomes enormous.

  As described above, in any case, there is no actual situation that can appropriately cope with non-subsidence or ground displacement during an earthquake without using a water-stopping member such as a complicated rubber.

JP 2002-61266 A

  The present invention has been made paying attention to the above points, and it is possible to join concrete structures that can appropriately cope with uneven settlement and ground displacement during earthquakes without using water-stopping members such as complex rubber. It aims to provide a method.

That is, one method of joining concrete structures according to the present invention is to lay a plurality of concrete structures having a cylindrical or U-shaped cross section spaced apart from each other by a predetermined dimension, and to a portion separated from the inner surface of the concrete structure. A non-polar backup material is installed, and the elongation capacity is 100% to 250% and the density is 0.8 to 1 in a state where the backup material is adhered to the space between the surface of the backup material and the inner surface of the concrete structure. A bonding part is formed by injecting an adhesive of 0 g / cm ^{3, and} the adhesive is mainly composed of a main agent composed of an epoxy resin and a curing agent composed of a modified silicone, and a catalyst is appropriately added to the curing agent. by controlling the reaction rate that, with the appropriate pot life suitable for the outside air temperature is obtained, in which construction completion time is housed in a proper range suitable for the outside temperature And features.

  According to such a method, since the density of the adhesive is small, the adhesive does not sag during construction, and the workability is excellent. Moreover, since the elongation ability is excellent, even when the ground subsidence or the displacement of the ground at the time of earthquake occurs, the bonded portion can follow and deform to ensure continuity and water tightness. That is, seismic resistance, continuity, and water tightness can be easily and inexpensively imparted to waterways and passages such as sewers using a concrete structure having a cylindrical or U-shaped cross section.

  The thickness of the adhesive layer that can ensure continuity and water-tightness by such an adhesive, that is, the depth of the space between the surface of the backup material and the inner surface of the concrete structure, The thing of 0.75 to 1.25 times the separation width is mentioned.

  As an aspect for suitably positioning the backup material, there is an example in which an external backup material is disposed outside the backup material.

Another method for joining concrete structures according to the present invention is to form a groove on the entire inner surface of the concrete structure in an existing concrete structure having a cylindrical or U-shaped cross section. The non-polar material backup material is installed in a part of the concave groove away from the inner surface of the concrete structure, and the elongation capacity in a state where the backup material is adhered to the space between the surface of the backup material and the inner surface of the concrete structure. Is formed by injecting an adhesive having a density of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ , and the adhesive is composed of an epoxy resin main component and a modified silicone. By controlling the reaction rate by adding a catalyst to the curing agent as appropriate, and using a curing agent as the main component, an appropriate pot life suitable for the outside temperature can be obtained, and the construction completion time can be adjusted to the outside temperature. Characterized in that the one in which is housed in an appropriate range.

  Even with such a method, the most main effects of the present invention described above, that is, the adhesive does not sag during construction, the workability is excellent, the occurrence of uneven subsidence or ground displacement during an earthquake occurs. Even when it is done, the bonded part can follow and deform to ensure continuity and water tightness, and it is easy and cheap to give seismic, continuous and water tightness to concrete structures The effect that it can be done can be obtained.

  As one preferred embodiment of such a joining method, the existing concrete structure is formed by laying a plurality of concrete products having a cylindrical or U-shaped cross section.

  Moreover, what forms the said ditch | groove in the inner surface of the junction part of the said concrete products which adjoin each other as another suitable embodiment of such a joining method is mentioned. If this is the case, by applying the present invention to the joint portion of an existing structure in which a plurality of concrete structures are laid adjacent to each other, the existing structure can be converted to the existing structure at a necessary time without blocking the traffic network. It can provide earthquake resistance, continuity and water tightness.

  Furthermore, as another preferred embodiment of such a joining method, there is a method in which the concave groove is formed at a damaged portion on the inner surface of the concrete structure. If it is such, it can repair a damaged part at the required time, without interrupting a traffic network, and can give earthquake resistance, continuity, and watertightness to the existing structure.

Furthermore, another method for joining concrete structures according to the present invention is to lay a plurality of concrete structures having a cylindrical or U-shaped cross-section apart from each other by a predetermined dimension, in a space between the concrete structures. The non-polar material backup material is installed in a part separated from the outer surface of the concrete structure, and the elongation capacity in a state of being bonded to the space between the surface of the backup material and the outer surface of the concrete structure is 100% to 250%. In addition, a bonding portion is formed by injecting an adhesive having a density of 0.8 to 1.0 g / cm ^{3, and} the adhesive mainly includes a main agent made of epoxy resin and a curing agent made of modified silicone. By properly adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside temperature can be obtained, and the construction completion time is suitable for the outside temperature. And characterized in that, housed in the appropriate range.

In addition, another method for joining concrete structures according to the present invention includes a concrete structure having a cylindrical or U-shaped cross-section and another structure having a cylindrical or U-shaped cross-sectional shape. Are placed relative to each other with a space between them, and a non-polar backup material is installed in a part of the space, and the elongation capacity in a state of being bonded to the other part of the space is 100% to 300%. In addition, a bonding portion is formed by injecting an adhesive having a density of 0.8 to 1.0 g / cm ^{3, and} the adhesive mainly includes a main agent made of epoxy resin and a curing agent made of modified silicone. By appropriately adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside air temperature can be obtained, and the construction completion time is within an appropriate range suitable for the outside air temperature. it is characterized in that it is .

  Here, if the elongation capacity is less than 100%, the allowable amount of displacement becomes small. Therefore, in order to appropriately cope with ground subsidence or ground displacement during an earthquake, the space between concrete structures and the concrete structures There arises a problem that a large amount of adhesive needs to be injected with an unreasonably large space between other structures. That is, when an adhesive having a low elongation capacity is used, there arises a problem that the space needs to be set unreasonably large in order to ensure an amount of elongation of the adhesive that is assumed in advance. Also, if the elongation capacity exceeds 300%, assuming that the volume of the adhesive before and after the displacement is not substantially changed, a portion where the adhesive becomes thin after the displacement is formed, and in this thinned portion There is a problem that resistance to external forces such as water pressure and earth pressure is reduced, and problems such as water leakage are likely to occur, and that a large amount of adhesive must be injected to ensure resistance after displacement. Occur. In the case where the elongation ability is in the range of 100 to 250%, the latter problem can be solved more remarkably.

Further, if the density of the adhesive is set to be lower than 0.8 g / cm ^3, it becomes difficult to ensure the adhesive ability. On the other hand, if the density of the adhesive exceeds 1.0 g / cm ³ , the adhesive is liable to sag during construction, resulting in a problem that the workability is reduced.

  Even with these configurations, the adhesive's elongation ability is excellent, so even when uneven subsidence or displacement of the ground during an earthquake occurs, the bonded part will follow and deform, such as complicated rubber Without using water-stopping members, it is possible to respond appropriately to ground subsidence and ground displacement during earthquakes.In other words, even when ground subsidence or ground displacement occurs during earthquakes, it is cheap and easy to The effect that watertightness can be ensured can be obtained.

  When the other structure is made of other than concrete, it is preferable to apply a primer to the surface of the other structure where the adhesive is injected before injecting the adhesive. .

  In the present invention, the “structure” is a concept that includes not only a combination of a plurality of parts but also a single part. That is, the “structure” includes, for example, manholes, box culverts, fume pipes, PVC pipes, steel pipes, and the like. The “elongation ability” is in accordance with commonly used ordinary terms. Specifically, the value of the elongation obtained by the tensile bond strength test shown in JIS A 1439. Say. For example, “the elongation ability is 100% or more” means that when the objects bonded by the adhesive are separated from each other at a speed of 5 mm / min, the separation distance becomes 200% or more before the separation starts. To do. “Density” is synonymous with the specific gravity defined in JIS K7112, as is well known.

  ADVANTAGE OF THE INVENTION According to this invention, the joining method of the concrete structure which can respond appropriately to uneven subsidence and the displacement of the ground at the time of an earthquake can be provided, without using water-stopping members, such as complicated rubber.

The figure which shows the installation aspect of the concrete structure which concerns on the 1st Embodiment of this invention. The center longitudinal section showing the structure formed using the concrete structure concerning the embodiment. Sectional drawing which shows the concrete structure which concerns on the same embodiment. AA sectional drawing in FIG. The figure for demonstrating the installation aspect of the junction part which concerns on the same embodiment. BB sectional drawing in FIG. Sectional drawing which shows the concrete structure which concerns on the 2nd Embodiment of this invention. The center longitudinal cross-sectional view which shows the junction part which concerns on the same embodiment. The figure for demonstrating the installation aspect of the junction part which concerns on the same embodiment. The figure for demonstrating the installation aspect of the junction part which concerns on the same embodiment. The figure for demonstrating the installation aspect of the junction part which concerns on the same embodiment. CC sectional drawing in FIG. The figure which shows the damaged part of the concrete structure which concerns on the 3rd Embodiment of this invention. The figure for demonstrating the installation aspect of the junction part which concerns on the same embodiment. The center longitudinal cross-sectional view which shows the junction part which concerns on the same embodiment. The front view which shows the installation aspect of the concrete structure which concerns on the 4th Embodiment of this invention, and is partially cut off. The expanded sectional view which shows the junction part which concerns on the same embodiment. The sectional side view which shows the installation aspect of the concrete structure which concerns on the same embodiment. The perspective view which shows the installation aspect of the concrete structure which concerns on the 5th Embodiment of this invention, and is partially cut off. The plane sectional view showing roughly the installation mode of the concrete structure concerning a 6th embodiment of the present invention. The plane sectional view showing roughly the installation mode of the concrete structure concerning a 7th embodiment of the present invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  The method for joining concrete structures according to the present embodiment is a concrete structure having a rectangular cross-sectional shape, more specifically, an underground structure such as a sewer that is formed by connecting a plurality of box culverts 1 that are concrete products. As shown in FIGS. 1 and 2, it is used when a new box culvert 1 is installed between the existing box culverts 1 ′. The new box culvert 1 is laid with a predetermined separation width w from each of the adjacent existing box culverts 1 ′, and is joined to the existing box culvert 1 ′ via the joint portion 2.

  As shown in FIG. 3, the box culvert 1 includes a pair of side plates 12, a bottom plate 11 continuous with the pair of side plates 12, and a top plate 13 positioned so as to face the bottom plate 11. In addition, the internal space 1s defined by the side plate 12, the bottom plate 11 and the top plate 13 is built in, and the so-called cross section has a rectangular tube shape with a rectangular shape, and has joint surfaces 1a at both ends in the longitudinal direction. These are connected by joining at the joint surface 1a to construct an underground structure. The joint surface 1a has a rectangular outer peripheral shape and a substantially rectangular inner peripheral shape, and has a quadrangular annular shape. In the present embodiment, the box culvert 1 which is a rectangular tube-shaped concrete product is described as shown in the figure. Of course, the U-shaped concrete is formed by a pair of side plates and a bottom plate and opened upward. You may apply this invention in order to comprise a three-surface waterway with a product.

  Here, the method for joining the box culvert 1 which is a concrete product according to the present invention is the joining formed by using the adhesive 21 between the joining surfaces 1a of the box culverts 1 having the joining surfaces 1a at both opposing ends. This is a method for joining concrete products to be joined by the part 2. The method for forming the joint portion 2 will be described in detail below together with the description of the configuration of each portion.

  As described above and as shown in FIGS. 4 and 6, the joint portion 2 is formed between adjacent box culverts 1, and the outer backup material 23 extends from the outer surface side to the inner surface side of the box culvert 1. And a backup seal material 22 formed of a non-polar substance that is an internal backup material, and an adhesive 21.

  More specifically, as shown in FIGS. 4 and 6, the outer backup material 23 extends from a plane connecting the outer surfaces of the adjacent box culverts 1 to a position separated from the inner surface of the box culvert 1 by a predetermined distance outward. Arranged in the area. The outer backup material 23 has a function of positioning the outer edge of the backup seal material 22. In this embodiment, after the outer backup material 23 is disposed between the adjacent box culverts 1, the backup seal material 22 is disposed inside the outer backup material 23. The outer backup material 23 is not necessarily provided.

  As described above and as shown in FIGS. 4 and 6, the backup seal material 22 is an annular member that is disposed inside the outer backup material 23 and has substantially the same thickness dimension over the entire region. It is formed by a substance. An adhesive 21 for joining the box culverts 1 is injected into a space 2 s between the inner surface of the backup seal material 22 and a plane connecting the inner surfaces of the box culverts 1. The depth d of the space 2s, that is, the distance from the inner surface of the backup seal material 22 to the plane connecting the inner surfaces of the box culvert 1 is set to 0.75 to 1.25 times the separation width w.

As described above and as shown in FIGS. 4 and 6, the adhesive 21 is injected inside the backup seal material 22, and between the box culverts 1 adjacent to each other with the adhesive 21 interposed therebetween. Has the function of joining. That is, the adhesive 21 is disposed at a position facing the internal space of the box culvert 1. Here, the elongation capacity of the adhesive 21 is 100% to 250%, and the density is 0.8 to 1.0 g / cm ³ . As the adhesive 21, for example, a highly elastic adhesive for caulking mainly composed of a main agent made of epoxy resin and a curing agent made of modified silicone can be used. In addition to the main agent and the curing agent, an ultralight powder or the like is appropriately added to the adhesive 21 in order to obtain the above density. Further, the adhesive 21 shows a characteristic suitable for construction with a mixed viscosity value of 150,000 ± 40000 mPa · s at 20 ° C. according to JIS K 6833 by adding a diluent separately. Furthermore, by appropriately adding a catalyst to the curing agent and controlling the reaction rate, it is possible to obtain an appropriate pot life suitable for the outside air temperature and to keep the construction completion time within an appropriate range suitable for the outside air temperature. it can.

  That is, when the adjacent box culverts 1 are joined, as shown in FIG. 5, the outer backup material 23 is first arranged in the space between the box culverts 1, and the backup seal material 22 is arranged inside thereof. Further, as shown in FIG. 6, a procedure is performed in which the adhesive 21 is injected inside the backup seal material 22 and waits until the adhesive 21 is solidified. Note that, when the adhesive 21 is injected, although not shown, masking is performed by a method such as applying a masking tape to a portion of the inner surface of the box culvert 1 adjacent to the space 2s. After solidifying, the masking is released by removing the masking tape. After the water channel is formed, when the subsidence or the displacement of the ground in the event of an earthquake occurs, the layer provided with the adhesive 21 is deformed so that the continuity and watertightness between the adjacent box culverts 1 are changed. Retain sex.

  As described above, according to the joining method according to the present embodiment, the ground is displaced due to uneven settlement or an earthquake, and the relative position between the box culverts 1 and 1 ′ changes accordingly. However, the adhesion part by the adhesive 21 can follow and deform | transform, and can ensure continuity and watertightness. That is, seismicity, continuity and water tightness are easily and inexpensively imparted to structures such as waterways and passages such as sewers using concrete products typified by box culverts 1 and 1 'having a rectangular cross section. can do.

  Moreover, according to this joining method, since a primer is not required, man-hours can be reduced and the construction period can be shortened.

  Furthermore, according to this construction method, if one of the box culverts 1 constituting the structure is replaced as necessary, and the joint portions 2 are formed on both sides of the box culvert 1, the structure can be obtained at a necessary time. Can be given earthquake resistance, continuity and water tightness.

  Next, a second embodiment of the present invention will be described below with reference to FIGS.

  The method for joining concrete structures according to the present embodiment is based on an existing box culvert A1 adjacent to each other in an underground structure such as a sewer that is formed by connecting a plurality of box culverts A1 that are concrete products having a rectangular cross section. This is applied to the joint portion.

  The box culvert A1 has substantially the same configuration as the box culvert 1 according to the first embodiment described above. That is, as shown in FIG. 7, it has a pair of side plates A12, a bottom plate A11 continuous with the pair of side plates A12, and a top plate A13 positioned facing the bottom plate A11, and these side plates A12, The so-called cross-section is a rectangular tube with a built-in internal space A1s partitioned by the bottom plate A11 and the top plate A13. The box culvert A1 is provided with joint surfaces A1a at both ends in the longitudinal direction, and a plurality of the joints are joined together at the joint surface A1a to construct an underground structure. The joint surface A1a has a rectangular outer peripheral shape and a substantially rectangular inner peripheral shape, and has a quadrangular annular shape. Further, in the present embodiment, a cutout A1t as shown in FIGS. 10 and 12 is provided over the entire circumference at a portion of the joint surface A1a that faces the internal space A1s. In the present embodiment, the box culvert A1 which is a concrete product having a rectangular tube shape is described as shown in the drawing, but of course, a U-shaped cross-sectional view having a pair of side plates A12 and a bottom plate A11 opened upward. The present invention may be applied to a three-sided water channel constituted by a concrete product. Note that “the cross-sectional shape is a rectangular tube” is a concept including an aspect in which the inner surface of the bottom plate A11 bulges in an arc shape in a cross-sectional view.

  Here, the bonding method of the box culvert A1 which is a concrete product according to the present invention is the bonding formed by using the adhesive A21 between the bonding surfaces A1a of the box culvert A1 having the bonding surfaces A1a at both opposing ends. It is the joining method of the concrete product which forms and joins part A2. The method for forming the joint A2 will be described in detail below together with the description of the configuration of each part.

  As described above and as shown in FIG. 12, the joint A2 is formed between the cutouts A1t of the box culverts A1 adjacent to each other, and from the outer surface side to the inner surface side of the box culvert A1, FIG. As shown in FIG. 12, a backup seal material A22 formed of a non-polar substance as a backup material and an adhesive A21 are arranged. Here, the cutout A1t is formed by cutting out the existing box culvert A1 using a concrete cutter or the like. That is, the distance w2 between the side surfaces of the notches A1t facing each other in adjacent box culverts A1 as shown in FIG. 10 is larger than the distance w20 between the existing box culverts A1 as shown in FIG.

  As shown in FIGS. 8 and 12, the backup seal material A22 is an annular member having substantially the same thickness dimension over the entire region, and is formed of a nonpolar substance. Further, the backup seal material A22 is arranged in a state of being in contact with the bottom surface of the notch A1t. An adhesive A21 for joining the box culverts A1 is injected into a space A2s between the inner surface of the backup seal material A22 and a plane connecting the inner surfaces of the box culverts A1. Here, the distance from the inner surface of the backup seal material A22 to the plane connecting the inner surfaces of the box culvert A1, that is, the depth d2 of the space A2s for arranging the adhesive A21, is the width of the space A2s, that is, the mutual It is set to 0.75 to 1.25 times the distance w2 between the side surfaces of the facing notch A1t.

The adhesive A21 has substantially the same configuration as that according to the first embodiment described above, and is arranged in substantially the same manner. That is, as described above and as shown in FIGS. 8 and 12, the adhesive A21 is injected inside the backup seal material A22, and the box culverts A1 adjacent to each other with the adhesive A21 interposed therebetween. It has the function of joining the gaps. In other words, the adhesive A21 is disposed at a position facing the internal space of the box culvert A1. Here, the elongation capacity of the adhesive A21 is 100% to 250%, and the density is 0.8 to 1.0 g / cm ³ . As this adhesive A21, for example, a highly elastic adhesive for caulking mainly composed of a main agent made of epoxy resin and a curing agent made of modified silicone can be used. In addition to the main agent and the curing agent, an ultralight powder or the like is appropriately added to the adhesive A21 in order to obtain the above density. In addition, this adhesive A21 exhibits characteristics suitable for construction with a mixed viscosity value of 150,000 ± 40000 mPa · s at 20 ° C. according to JIS K 6833 by adding a separate diluent. Furthermore, by appropriately adding a catalyst to the curing agent and controlling the reaction rate, it is possible to obtain an appropriate pot life suitable for the outside air temperature and to keep the construction completion time within an appropriate range suitable for the outside air temperature. it can.

  That is, in this embodiment, when joining adjacent box culverts A1, notches A1t are formed as shown in FIG. 10 in each of the mutually facing joint surfaces A1a of adjacent box culverts A1, as shown in FIG. The backup sealing material A22 is attached to the bottom of the notch A1t, and the adhesive A21 is injected into the backup sealing material A22 as shown in FIG. 12, and the process waits until the adhesive A21 is solidified. I do. Note that when the adhesive A21 is injected, the same masking process as that according to the first embodiment described above is performed. Also in this embodiment, when a ground subsidence or a displacement of the ground during an earthquake occurs after forming a water channel, the layer provided with the adhesive A21 is deformed, so that adjacent box culverts A1. Maintains continuity and watertightness.

  As described above, even with the joining method according to the present embodiment, even when uneven subsidence or displacement of the ground at the time of an earthquake occurs, the adhesion site by the adhesive A21 is deformed following these and continuously. And water tightness can be ensured. That is, it is possible to easily impart seismic resistance, continuity, and watertightness to a structure such as a waterway or a passage such as a sewer using a concrete product having a rectangular or U-shaped cross section.

  Moreover, since this primer does not require a primer, the number of man-hours and the construction period can be shortened.

  Furthermore, according to this construction method, all the operations for forming the joint A2 can be performed inside the box culvert A1 that constitutes the existing structure, so that no special work or processing is required. In an existing structure formed by using the culvert A1, it is possible to impart seismic resistance, continuity, and water tightness to the structure at a necessary time without interrupting road traffic for a long time.

  Next, a third embodiment of the present invention will be described below with reference to FIGS.

  The method for joining concrete structures according to the present embodiment is based on the existing underground structure such as a sewer that is formed by connecting a plurality of box culverts B1 that are rectangular concrete products having a rectangular cross section. The box culvert B1 constituting the structure is applied to a fractured portion B1x where a fracture such as a crack as shown in FIG. 13 has occurred. This joining method will be described below together with the description of the configuration of each part. In this embodiment, the box culvert B1 which is a rectangular tube-shaped concrete product has been described. Of course, the U-shaped concrete product having a U-shaped cross section, which is composed of a pair of side plates and a bottom plate and opened upward. The present invention may be applied to the configured three-surface water channel. Furthermore, you may apply this invention to the structure formed by hitting concrete on-site.

  In the present embodiment, as shown in FIG. 14, a cutout B1t having a width dimension w3 larger than the breakage point B1x is provided on the inner surface side of the fracture portion at the breakage point B1x. Inside the notch, as in the second embodiment described above, and as shown in FIG. 15, the non-polar as a backup material from the outer surface side to the inner surface side of the box culvert B1 A junction B2 is provided in which a backup seal material B22 made of a substance and an adhesive B21 are arranged. Here, the notch B1t is formed by notching the existing box culvert B1 using a concrete cutter or the like.

  As described above and as shown in FIG. 15, the joint B2 is formed in a notch formed in the tearing portion of the box culvert B1, and is backed up from the outer surface side to the inner surface side of the box culvert B1. Each of the sealing material B22 and the adhesive B21 is arranged. Here, the notch B1t is formed by notching the existing box culvert B1 using a concrete cutter or the like.

  As shown in FIG. 15, the backup seal material B22 is a member having substantially the same thickness dimension over the entire region, and is formed of a nonpolar substance. Further, the backup seal material B22 is arranged in a state of being in contact with the bottom surface of the notch B1t. Then, as shown in FIG. 15, an adhesive B21 for joining the broken portion B1x of the box culvert B1 is injected into the space B2s between the inner surface of the backup seal material B22 and the inner surface of the box culvert B1. . The depth of the space B2s, that is, the distance d3 from the inner surface of the backup seal material B22 to the inner surface of the box culvert B1 is set to 0.75 to 1.25 times the width dimension w3 of the notch B1t.

The adhesive B21 has substantially the same configuration as that according to the first embodiment described above, and is arranged in substantially the same manner. That is, as shown in FIG. 15, the adhesive B21 is injected into the backup seal material B22 as described above, and has a function of joining the breakage point B1x of the box culvert B1. In other words, the adhesive B21 is disposed at a position facing the internal space B1s of the box culvert B1. Here, the elongation capacity of the adhesive B21 is 100% to 250%, and the density is 0.8 to 1.0 g / cm ³ . As this adhesive B21, for example, a highly elastic adhesive for caulking mainly composed of a main agent made of epoxy resin and a curing agent made of modified silicone can be used. Further, in addition to the main agent and the curing agent, an ultralight powder or the like is appropriately added to the adhesive B21 in order to obtain the above density. In addition, this adhesive B21 exhibits characteristics suitable for construction in which the value of the mixed viscosity at 20 ° C. according to JIS K 6833 is 150,000 ± 40000 mPa · s by adding a separate diluent. Furthermore, by appropriately adding a catalyst to the curing agent and controlling the reaction rate, it is possible to obtain an appropriate pot life suitable for the outside air temperature and to keep the construction completion time within an appropriate range suitable for the outside air temperature. it can.

  That is, in the present embodiment, when joining adjacent box culverts B1, a concrete cutter or the like is cut at a location where a tear has occurred in any of the top plate, the side wall, and the bottom plate of the box culvert B1 that forms an existing pipe line. 14, the notch B1t is formed as shown in FIG. 14, and a backup seal material B22 is attached to the bottom surface of the notch B1t as shown in FIG. 15, and further adhered to the inside of the backup seal material B22. The procedure of injecting the agent B21 and waiting until the adhesive B21 is solidified is performed. When injecting the adhesive B21, the same masking process as that according to the first embodiment described above is performed. Also in this embodiment, when a ground subsidence or a displacement of the ground during an earthquake occurs after forming a water channel, the layer provided with the adhesive B21 is deformed, thereby adjacent box culverts B1. Maintains continuity and watertightness.

  As described above, even with the joining method according to the present embodiment, even when uneven subsidence or ground displacement occurs in the event of an earthquake, the bonded portion due to the adhesive B21 is deformed and continuously follows these. And water tightness can be ensured. That is, it is possible to easily impart seismic resistance, continuity, and water tightness to structures such as waterways and passages such as sewers using a concrete product having a rectangular or U-shaped cross section.

  Moreover, since this primer does not require a primer, the number of man-hours and the construction period can be shortened.

  Furthermore, according to this construction method, since all the operations for forming the joint B2 can be performed inside the box culvert B1 constituting the existing structure, the box is not required to be specially crafted or processed. In existing structures formed using culverts B1 and existing structures formed by spotting concrete, repair the fracture points B1x of the structures without interrupting road traffic for a long period of time, It can provide earthquake resistance, continuity and water tightness.

  Next, a fourth embodiment of the present invention will be described below with reference to FIGS.

  The concrete structure joining method of the present embodiment is applied to a joint portion between a box culvert C1 which is one concrete structure and a manhole C3 which is another concrete structure. The tube mounting wall block body of the manhole C3 has a rectangular shape in plan view.

In the present embodiment, the joint C2 is formed by arranging a backup material C22 and an adhesive C21 in order from the outer surface side of the manhole C3 in a space formed between the box culvert C1 and the manhole C3. The backup material C22 in this aspect is formed by forming a rod-like member having a circular cross-sectional view in a frame shape, and a plurality of the backup materials C22 are arranged adjacent to each other in the depth direction of the space. In this embodiment, for example, a rubber sheet-like coating material C24 is attached to the outer surface of the manhole C3 to cover the backup material C22. In FIG. 18, the covering material C24 is indicated by an imaginary line. On the other hand, the adhesive C21 has the same configuration as that in the first to third embodiments described above. That is, a material having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ is used. The adhesive C21 is injected into a space between the surface of the backup material C22 and the inner surface of the manhole C3.

  A notch C3a is provided between the manhole C3 and the invert C31 provided at the bottom of the manhole C3, and a spacer C25 formed of foamed polystyrene is inserted into the notch C3a. Further, above the spacer C25, mortar C26 is filled so that the upper surface is flush with the upper surface of the invert C31.

  Also by the joining method of this embodiment, when the ground subsidence or the displacement of the ground at the time of an earthquake generate | occur | produces, the adhesion | attachment site | part by the adhesive C21 can follow these and can deform | transform and can ensure continuity and watertightness. That is, earthquake resistance, continuity, and watertightness can be easily and inexpensively provided at the joint between the box culvert C1 and the manhole C3. In other words, it is possible to appropriately cope with uneven settlement and displacement of the ground during an earthquake without using a complicated water-stopping member such as rubber.

  Furthermore, when forming the joint C2 in the present embodiment, since all the operations can be performed inside the manhole C3, the earthquake resistance and continuity can be achieved without interrupting road traffic for a long period of time when necessary. And water tightness can be imparted.

  Next, a fifth embodiment of the present invention will be described below with reference to FIG.

  The concrete structure joining method of the present embodiment is applied to a joint portion between a fume pipe D1 which is one concrete structure and a manhole D3 which is another concrete structure. The tube mounting wall block body of the manhole D3 has a rectangular shape in plan view.

In the present embodiment, the joining portion D2 is formed by arranging a backup material D22 and an adhesive D21 in order from the outer surface side of the manhole D3 in a space formed between the fume tube D1 and the manhole D3. The backup material D22 in this aspect is formed by forming a rod-like member having a circular shape in cross section in an annular shape, and a plurality of the backup materials D22 are arranged adjacent to each other in the depth direction of the space. On the other hand, the adhesive D21 has the same configuration as that in the first to fourth embodiments described above. That is, a material having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ is used. The adhesive D21 is injected into a space between the surface of the backup material D22 and the inner surface of the manhole D3.

  A notch D3a is provided between the manhole D3 and the invert D31 provided at the bottom of the manhole D3, and a spacer D25 formed of foamed polystyrene is inserted into the notch D3a. Further, mortar D26 is filled above the spacer D25 so that the upper surface is flush with the upper surface of the invert D31.

  Also by the joining method of this embodiment, when the ground subsidence or the displacement of the ground at the time of an earthquake generate | occur | produces, the adhesion site | part by the adhesive agent D21 deform | transforms following these and can ensure continuity and watertightness. That is, earthquake resistance, continuity, and water tightness can be easily imparted to the joint portion between the box culvert D1 and the manhole D3 at low cost. In other words, it is possible to appropriately cope with uneven settlement and displacement of the ground during an earthquake without using a complicated water-stopping member such as rubber.

  Furthermore, when forming the joint D2 in the present embodiment, all work can be performed inside the manhole D3, so that it is earthquake resistant and continuous without interrupting road traffic for a long period of time when necessary. And water tightness can be imparted.

  Next, a sixth embodiment of the present invention will be described below with reference to FIG.

  The concrete structure joining method according to the present embodiment is applied to a joint portion between a fume pipe E1 which is one concrete structure and a manhole E3 which is another concrete structure. The tube mounting wall block body of the manhole E3 has a cylindrical shape.

The joining portion E2 in the present embodiment is formed by arranging a backup material E22 and an adhesive E21 in order from the inner surface side of the manhole E3 in a space formed between the fume tube E1 and the manhole E3. The backup material E22 in this aspect is formed by forming a rod-like member having an elliptical sectional view in an annular shape, and a plurality of the members are arranged adjacent to each other in the depth direction of the space. On the other hand, the adhesive E21 has the same configuration as that in the first to fifth embodiments described above. That is, a material having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ is used. The adhesive E21 is injected into a space between the surface of the backup material C22 and the outer surface of the manhole C3.

  In addition, a mortar E26 is filled between the surface of the backup E22 and the inner surface of the manhole E3 so as to be flush with the inner surface of the manhole E3.

  Also by the joining method of this embodiment, when the ground subsidence or the displacement of the ground at the time of earthquake occurs, the adhesion site | part by the adhesive agent E21 tracks and changes these, and can ensure continuity and watertightness. That is, it is possible to easily impart seismic resistance, continuity, and water tightness to the joint portion between the box culvert E1 and the manhole E3 at low cost. In other words, it is possible to appropriately cope with uneven settlement and displacement of the ground during an earthquake without using a complicated water-stopping member such as rubber.

  Next, a seventh embodiment of the present invention will be described below with reference to FIG.

  The concrete structure joining method of the present embodiment is applied to a joint portion between a box culvert F1 which is one concrete structure and a manhole F3 which is another concrete structure. The tube mounting wall block body of the manhole F3 has a rectangular shape in plan view. Further, the box culvert F1 extends while being inclined with respect to the normal line of the tube mounting wall of the manhole F3.

The joint portion F2 in the present embodiment is formed by arranging a backup material F22 and an adhesive F21 in the space formed between the box culvert F1 and the manhole E3 in order from the outer surface side of the box culvert F1. The backup material F22 in this aspect is formed by forming a rod-like member having an elliptical cross-sectional view in a frame shape, and a plurality of them are arranged adjacent to each other in the depth direction of the space. On the other hand, the adhesive F21 has the same configuration as that in the first to sixth embodiments described above. That is, a material having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ is used. The adhesive F21 is injected into a space between the surface of the backup material C22 and the outer surface of the manhole C3.

  Also by the joining method of this embodiment, when the subsidence or the displacement of the ground at the time of an earthquake occurs, the adhesion site | part by the adhesive agent F21 deform | transforms following these and can ensure continuity and watertightness. That is, it is possible to easily impart seismic resistance, continuity, and water tightness to the joint portion between the box culvert F1 and the manhole F3 at low cost. In other words, it is possible to appropriately cope with uneven settlement and displacement of the ground during an earthquake without using a complicated water-stopping member such as rubber.

  Furthermore, when forming the joint portion F2 in the present embodiment, all work can be performed inside the manhole F3, so that it is earthquake resistant and continuous without interrupting road traffic for a long period of time when necessary. And water tightness can be imparted.

  The present invention is not limited to the first to seventh embodiments described above.

  For example, even when constructing a newly formed structure by laying a plurality of pre-formed concrete structures prior to laying a box culvert or the like, the first portion of the present invention is applied to a joint portion between adjacent concrete products. Of course, a joining method such as that in the embodiment may be adopted.

  In addition, the present invention may be applied to a structure formed by on-site casting of concrete, not limited to a structure formed by connecting a plurality of concrete structures formed in advance prior to laying. That is, in the case where a plurality of concrete structures are formed by hitting concrete on-site and formed with a gap between adjacent concrete structures, the concrete structures are related to the second embodiment described above. You may join by the joining method like a thing, and you may join the damaged part of the structure formed by hitting concrete on the spot by the joining method like what concerns on 3rd Embodiment mentioned above. In addition, in an existing concrete structure that is formed entirely by in-situ concrete, a concave groove is formed on the entire circumference of the inner surface, a backup seal material is disposed on the bottom surface side of the concave groove, and the backup seal material is further provided. A bonding method in which an adhesive is injected into the opposite side of the bottom surface of the groove may be employed. In addition, the invention according to claim 1 or claim 9 may be applied to a joint between a manhole formed by spotting concrete and a concrete structure having a cylindrical or U-shaped cross section.

  Moreover, the present invention may be applied to a structure having a cross-sectional shape other than a rectangular shape, such as a circular shape or a semicircular shape. That is, you may apply this invention to the junction part of fume pipes.

In addition, the joining method of the invention according to claim 10 is used for joining a concrete structure having a cylindrical or U-shaped cross-section and another structure having a cylindrical or U-shaped cross-sectional shape. May be. For example, a manhole that is a concrete structure and a pipe or a steel pipe that is formed of a synthetic resin such as vinyl chloride that is another structure are disposed relative to each other with a space between them, and a nonpolar substance is formed in a part of the space. In order to form a joint by injecting an adhesive having an elongation capacity of 100% to 300% and a density of 0.8 to 1.0 g / cm ³ into the other part of the space. It may be.

  In this case, it is preferable to apply a primer to the surface on the side where the adhesive of another structure is injected before injecting the adhesive.

  Even with such a joining method, the adhesive part is formed by an adhesive having an excellent elongation capacity exceeding 100%, so that the adhesive part follows these when a ground subsidence or ground displacement occurs during an earthquake. It can be deformed to ensure continuity and water tightness. In addition, since the upper limit of the elongation capacity is suppressed to 300%, the resistance to external forces such as water pressure and earth pressure is reduced due to the fact that the adhesion part becomes significantly thinner with the deformation of the adhesion part, and water leakage It is also possible to suppress the occurrence of problems that are likely to cause such problems. In other words, at the joint between a manhole and a tube made of synthetic resin or a steel pipe, without using a water-stopping member such as a complex rubber, and without using a large amount of adhesive, the subsidence of the ground at the time of uneven settlement or earthquake It is possible to appropriately cope with the displacement.

  In the first to seventh embodiments described above, the upper limit of the elongation capacity of the adhesive is set to 250% in order to ensure resistance to external forces such as water pressure and earth pressure without using a large amount of adhesive. However, when used in an environment where the water pressure or earth pressure is low, an adhesive having an elongation capacity of 250 to 300% may be used.

  In addition, various modifications may be made without departing from the spirit of the present invention.

1, A1, B1, C1, F1, ... box culvert (concrete structure)
D1, E1 ... Hume pipe (concrete structure)
2, A2-F2 ... Junction 21, A21-F21 ... Adhesive 22, A22-F22 ... Backup material

Claims (11)

A plurality of concrete structures having a cylindrical or U-shaped cross section spaced apart by a predetermined dimension are laid, and a nonpolar substance backup material is installed in a portion separated from the inner surface of the concrete structure, and the surface of the backup material Joining is formed by injecting an adhesive having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ in a state of being bonded to the space between the inner surface of the concrete structure. And
The adhesive is mainly composed of a main agent composed of an epoxy resin and a curing agent composed of a modified silicone, and by appropriately adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside temperature And the construction completion time is within an appropriate range suitable for the outside air temperature . The method for joining concrete structures according to claim 1, wherein the depth of the space is 0.75 to 1.25 times the separation width between the concrete structures. The method for joining concrete structures according to claim 1, wherein an outer backup material is disposed outside the backup material. In an existing concrete structure having a cylindrical or U-shaped cross-section, a concave groove is formed on the inner surface of the concrete structure, and a nonpolar substance is backed up in a portion separated from the inner surface of the concrete structure in the concave groove. The material has an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ in a state of being bonded to a space between the surface of the backup material and the inner surface of the concrete structure. Forming a joint by injecting adhesive ,
The adhesive is mainly composed of a main agent composed of an epoxy resin and a curing agent composed of a modified silicone, and by appropriately adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside temperature And the construction completion time is within an appropriate range suitable for the outside air temperature . The method for joining concrete structures according to claim 4, wherein the existing concrete structure is formed by laying a plurality of concrete products having a cylindrical or U-shaped cross section. The method for joining concrete structures according to claim 5, wherein the concave groove is formed on an inner surface of a joint portion between the concrete products adjacent to each other. The method for joining concrete structures according to claim 4 or 5, wherein the groove is formed at a damaged portion on the inner surface of the concrete structure. The method for joining concrete structures according to claim 4, 5, 6, or 7, wherein a depth of the space is 0.75 to 1.25 times a width dimension of the space. A plurality of concrete structures having a cylindrical or U-shaped cross-section are spaced apart by a predetermined dimension, and a non-polar substance backup material is installed in the space between the concrete structures and away from the outer surface of the concrete structure. An adhesive having an elongation capacity of 100% to 250% and a density of 0.8 to 1.0 g / cm ³ in a state of being bonded to a space between the surface of the backup material and the outer surface of the concrete structure is injected. To form a joint ,
The adhesive is mainly composed of a main agent composed of an epoxy resin and a curing agent composed of a modified silicone, and by appropriately adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside temperature And the construction completion time is within an appropriate range suitable for the outside air temperature . A concrete structure having a cylindrical or U-shaped cross-section and another structure having a cylindrical or U-shaped cross-sectional shape are disposed relative to each other with a space in between, and part of the space A non-polar backup material is installed, and an adhesive having an elongation capacity of 100% to 300% and a density of 0.8 to 1.0 g / cm ³ in a state of being bonded to the other part of the space is injected. To form a joint ,
The adhesive is mainly composed of a main agent composed of an epoxy resin and a curing agent composed of a modified silicone, and by appropriately adding a catalyst to the curing agent and controlling the reaction rate, an appropriate pot life suitable for the outside temperature And the construction completion time is within an appropriate range suitable for the outside air temperature . 11. The other structure is made of a material other than concrete, and a primer is applied to the surface of the other structure on which the adhesive is injected before the adhesive is injected. For joining concrete structures in the world.

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