JP2018184771A - Joining method of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method for a concrete structure capable of suitably maintaining the joined state of a plurality of joined concrete structures even when an external event is received. SOLUTION: This is a method for joining concrete structures, which is a laying step of laying a plurality of concrete structures with a predetermined gap between them, and a resin adhesive is injected between the separated end faces of adjacent concrete structures. Adhesive injecting step of forming a joint that connects the two to each other, for adjacent concrete structures, at least left and right side surfaces of the adjacent concrete structures, and a single or multiple positions for connecting the bottom surfaces. And a step of mounting the displacement prevention member, wherein the displacement prevention member is fixed to one concrete structure and is movable relative to the other concrete structure. Has been. [Selection diagram] Figure 1

Description

  The present invention relates to a concrete structure joining method for joining cylindrical or U-shaped concrete structures.

  Conventionally, various methods have been employed as a method of laying a cylindrical or U-shaped concrete structure. As an example, after attaching a gasket having water-stopping properties such as rubber to the outer periphery of the fitting convex portion provided at the end of the concrete structure, and engaging it with the concave portion of the existing concrete structure, A method of fitting the packing into the recess by pulling it with a turnbuckle or the like can be mentioned (for example, see Patent Document 1).

  Also in the conventional method, at the stage of laying a plurality of concrete structures, the plurality of concrete structures can be suitably joined together.

  However, in the conventional method, when an external event occurs after laying, a plurality of concrete structures may be greatly displaced from each other. In this case, the joint state between the plurality of concrete structures is impaired. There is a problem that it will be.

  Here, the “external event” is an external event that may change the relative position of the joined concrete structures and damage the joining state of the two, such as subsidence of the foundation ground, non-settlement of the foundation ground. In addition to natural phenomena such as the occurrence of buoyancy due to earthquakes, groundwater, etc., unbalanced load at the time of backfilling, propulsion method (in addition to what pushes the concrete structure by using the reaction wall to obtain the reaction force) , Including an artificial force such as an external force received during the process of obtaining a reaction force from a concrete structure and advancing a shield machine).

JP 2002-61266 A

  The present invention has been made paying attention to the above points, and provides a method for joining concrete structures in which the joining state of a plurality of joined concrete structures is suitably maintained even when an external event occurs. There is.

  That is, the present invention has the following configuration.

  The invention according to claim 1 is a method for joining concrete structures in which a plurality of concrete structures having a cylindrical shape or a U-shape forming an internal space are joined so that the internal spaces communicate with each other. A laying step of laying the concrete structure with a predetermined gap, and an adhesive injection step of injecting a resin adhesive between spaced end surfaces of adjacent concrete structures to form a joint portion connecting the end surfaces; One or a plurality of misalignment preventing members for connecting at least the side surfaces and the bottom surfaces of the adjacent concrete structures mainly composed of an attachment plate having a size capable of being attached to both adjacent concrete structures. And a misalignment prevention member attaching step, wherein the misalignment prevention member is fixed to one concrete structure. A shall, a method of joining concrete structure mounted for relative movement with respect to the other concrete structures.

The invention according to claim 2 is characterized in that the resin adhesive is in a state in which adjacent concrete structures are bonded to each other, with an elongation capacity of 1% to 500%, a hardness of 10 to 95, and a viscosity of 100 to 500,000 mPa · The s, the thixotropy ratio is 1 to 5, the adhesive strength is set to a value of 0.1 to 10.0 N / mm ² , and the density is set to a value of 0.5 to 2.0 g / cm ³ . This is a method for joining concrete structures.

  According to a third aspect of the present invention, the plurality of concrete structures are of a substantially rectangular tube shape, a plurality of the positional deviation prevention members are provided, and the positional deviation prevention members are adjacent to each other. The method for joining concrete structures according to claim 1 or 2, wherein the top surfaces, the left and right side surfaces, and the bottom surfaces of the matching concrete structures are connected.

  In the above claims, the upper surface, the side surface, and the bottom surface are not only the upper surface, the side surface, and the bottom surface on the outer surface side, but the upper surface, the side surface, and the inner surface side, unless explicitly limited. The bottom is included.

  The “concrete structure” is a concept that includes not only a combination of a plurality of parts but also a single part.

  “Elongation ability” means a value of elongation obtained by a tensile bond strength test shown in JIS A 1439. 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.

  “Hardness” is a value in accordance with JIS K 6253.

  “Viscosity” means a value measured with a BH viscometer.

  The “thixotropic ratio” means a flow phenomenon in which the viscosity decreases by vibration or stirring, and the numerical value is based on a thixotropy index (TI value).

  “Adhesive strength” is a value measured by the method described in JIS A 1439.

  “Density” is synonymous with the specific gravity defined in JIS K 6833.

  ADVANTAGE OF THE INVENTION According to this invention, even when an external event generate | occur | produces, the joining method of the concrete structure which can hold | maintain the joining state of the joined concrete structure suitably can be provided.

The side view which shows one Embodiment of this invention. The center longitudinal cross-sectional view in the same embodiment. The front view of the box culvert concerning the embodiment. XX sectional drawing in FIG. The perspective view in the embodiment. The partial enlarged end view for demonstrating the junction part etc. which concern on the embodiment. The partial enlarged end view for demonstrating the junction part etc. which concern on the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The YY line partial expanded sectional view in FIG. The table | surface which shows the performance parameter | index and numerical range of a resin adhesive. The partial expanded end view corresponding to FIG. 7 which shows other embodiment. The partial expanded end view corresponding to FIG. 7 which shows other embodiment. The partial expanded side view for description which shows other embodiment. The partial expanded side view for description which shows other embodiment.

  Embodiments of the present invention will be described below with reference to FIGS.

  In this embodiment, the present invention is applied to an underground structure K such as a sewer. That is, in order to construct the underground structure K in this embodiment, the joining method of the box culvert 1 which is a concrete structure is applied.

  The box culvert 1 is joined by joining a plurality of cylindrical box culverts 1 forming the internal space 1s so that the internal spaces 1s communicate with each other in a manner excellent in continuity and watertightness.

  The box culvert 1 is joined by a laying step S1 in which a plurality of box culverts 1 having the same shape are laid with a predetermined gap w, and between the spaced end faces 1a in the adjacent box culverts 1 after passing through the laying step S1. Next, after passing through the backup material installation step S2 and the backup material installation step S2 in which the backup material installation portion 3 is formed by installing the outer backup material 31 and the inner backup material 32 which is a backup material of a nonpolar substance. An adhesive injection step S3 is provided for injecting a resin adhesive B between the spaced end faces 1a of the matching box culverts 1 to form a joint 2 that connects the end faces 1a.

  Furthermore, the bonding method of the box culvert 1 in this embodiment is a plurality of positions for connecting the upper surfaces on both outer surfaces, the left and right side surfaces, and the bottom surfaces of the adjacent box culverts 1 after passing through the laying step S1. A displacement prevention member attaching step S4 for attaching the displacement prevention members M (U) and M (S) is provided.

  First, the underground structure K constructed by using the box culvert 1 joining method will be described.

  The underground structure K includes a plurality of box culverts 1 having a cylindrical shape forming the internal space 1s, and a joint 2 formed between the opposing end faces 1a of the adjacent box culverts 1 and formed by a resin adhesive B. A backup material intervening portion 3 having an outer backup material 31 and an inner backup material 32 provided between the opposing end surfaces 1a of adjacent box culverts 1 and disposed adjacent to the joint portion 2, and an adjacent box culvert. In the case where an external event is provided, the relative movement (relative displacement) between the axial culverts 1 in the direction in which the internal space 1s communicates with each other is allowed, but in the direction orthogonal to the axial direction. There are provided misalignment prevention members M (U) and M (S) that can prohibit relative movement (relative displacement).

  Hereinafter, each structure of the underground structure K is demonstrated.

  The box culvert 1 has an internal space 1s surrounded by the surrounding area. The box culvert 1 is laid with respect to another adjacent box culvert 1 through a predetermined gap w. In the gap w, the joint portion 2 and the backup material interposing portion 3 are provided. Adjacent box culverts 1 are made of resin adhesive B and are firmly bonded via a joint 2 that is excellent in stretchability and flexibility.

  The box culvert 1 includes a bottom plate 11, a pair of side plates 12 erected from the left and right end portions of the bottom plate 11, and a top plate placed between the upper ends of the pair of side plates 12 and facing the bottom plate 11. 13. The box culvert 1 forms an internal space 1 s defined by a bottom plate 11, left and right side plates 12, and a top plate 13. That is, the box culvert 1 has a substantially square cylindrical shape by the bottom plate 11, the side plate 12, and the top plate 13. The box culvert 1 includes end surfaces 1a that are joint surfaces at both ends in a direction in which the internal space 1s communicates. The plurality of box culverts 1 are joined to each other at the end faces 1a facing each other via a joint portion 2 to form an underground structure K that is installed underground. The end surface 1a of the box culvert 1 has a substantially square ring shape.

  The joint portion 2 is formed between adjacent box culverts 1. The joint 2 is made as a result of solidifying after the resin adhesive B is injected. The resin adhesive B that forms the joint portion 2 is injected so as to fill a space sp between the inner surface of the inner backup material 32 and the virtual surface that is substantially flush with the inner surface of the box culvert 1. Note that the depth d of the space sp in the gap w, that is, the distance between the inner surface of the inner backup material 32 and the virtual plane that is substantially flush with the inner surface of the box culvert 1 is, for example, 0.2 to The value is set to 3.0 times.

  The resin adhesive B that forms the joint portion 2 is injected inside the inner backup material 32. The resin adhesive B is interposed between adjacent box culverts 1 and exhibits a function of adhering adjacent box culverts 1 to each other. The resin adhesive B is disposed at a position facing the internal space 1 s of the box culvert 1.

  As the resin adhesive B, various resins can be applied. The resin adhesive B can be composed of, for example, a polyurethane resin, a modified urethane resin, a silicon resin, a modified silicon resin, an acrylic resin, a modified acrylic resin, an epoxy resin, a modified epoxy resin, a butyl resin, or a modified butyl resin. Is. In this embodiment, the resin adhesive B is mainly composed of a main agent made of an epoxy resin and a curing agent made of a modified silicon resin.

The resin adhesive B can be set to a predetermined numerical value shown in FIG. That is, the elongation capacity of the resin adhesive B in a state of being bonded between the end faces 1a of the adjacent box culverts 1 is 1% to 500%, the hardness is 10 to 95, and the viscosity is 100 to 500,000 mPa · s. Yes, the thixotropy ratio is 1 to 5, the adhesive strength is 0.1 to 10.0 N / mm ² , and the density is 0.5 to 2.0 g / cm ³ .

In addition, in order to obtain the density of 0.8-1.0 g / cm < ³ > in addition to the main ingredient which consists of an epoxy resin, and the hardening | curing agent which consists of modification | denaturation silicon resin, the resin adhesive B in this embodiment is a super lightweight suitably The powder etc. are added. Further, the resin adhesive B has a mixed viscosity value of 150,000 ± 50000 mPa · s at 20 ° C. according to JIS K 6833 by separately adding a diluent. In addition, by appropriately 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 can be kept within an appropriate range suitable for the outside temperature. it can.

  The backup material interposing part 3 is disposed between the facing end faces 1 a of the adjacent box culverts 1. The backup material interposing unit 3 includes an outer backup material 31 and an inner backup material 32. The outer backup material 31 and the inner backup material 32 are arranged in this order from the outer surface side to the inner surface side of the box culvert 1.

  The outer backup material 31 is mainly for suppressing the intrusion of earth and sand, and is arranged at a position near the outer peripheral edge of the end surface 1 a of the box culvert 1. The outer backup material 31 exhibits a function of positioning the outer peripheral edge of the inner backup material 32. In this embodiment, after the outer backup material 31 is disposed between the adjacent box culverts 1, the inner backup material 32 is disposed on the inner side. The outer backup material 31 is not necessarily provided. Further, when the outer backup material 31 is provided, it may not be provided in the entire region on the outer peripheral edge side of the end surface 1a of the box culvert 1, but may be provided partially.

  The inner backup material 32 is provided at a position adjacent to the joint portion 2 made of the resin adhesive B. The inner backup material 32 is arranged inside the outer backup material 31 and is an annular material having substantially the same thickness dimension over the entire area. The inner backup material 32 is formed of a nonpolar substance.

  Next, the upper misalignment prevention member M (U) and the lower misalignment prevention member M (S), which are misalignment prevention members, will be described.

  The upper and lower misalignment prevention members M (U) and M (S) are plate-like attachment plates (more specifically, each having a size capable of making contact with the outer peripheral surface of the adjacent box culvert 1. For example, an upper surface contact plate u1 and a side surface contact plate u2, a lower surface contact plate s1, and a side surface contact plate s2 described later are mainly configured.

  The upper and lower position shift prevention members M (U) and M (S) are installed between the outer peripheral surfaces of the open end portions of the adjacent box culverts 1. The upper and lower position shift prevention members M (U) and M (S) play a role of preventing the adjacent box culverts 1 from shifting in the direction perpendicular to the axial direction. More specifically, the upper and lower position displacement prevention members M (U) and M (S) are, when subjected to an external event, the box culvert 1 in the direction in which the internal space 1s communicates, that is, in the axial direction. While allowing relative movement between each other, relative movement in a direction orthogonal to the axial direction can be prohibited. The upper and lower position shift prevention members M (U) and M (S) are fixed to one box culvert 1 of adjacent box culverts 1, and are attached to the other box culvert 1. It is attached so as to be capable of relative movement.

  The upper misalignment prevention members M (U) are disposed in pairs near the left and right end portions of the outer surface of the top plate 13. The upper misalignment prevention member M (U) has a shape that fits into an upper recessed portion h1 provided at a corner portion formed by the side plate 12 and the top plate 13. That is, the upper misalignment prevention member M (U) is formed in a substantially L shape in a front view and a cross-sectional view, and is disposed in the upper recessed portion h11 opened upward in the upper recessed portion h1. An upper surface contact plate u1 and a side surface contact plate u2 disposed in a side recessed portion h12 opened laterally in the upper recessed portion h1. The upper displacement prevention member M (U) is made of metal, and the upper surface contact plate u1 and the side surface attachment plate u2 that form the upper position displacement prevention member M (U) are integrally formed. . The upper misalignment prevention member M (U) disposed in the upper recessed portion h1 is set so that the outer surface of the upper surface contact plate u1 is substantially flush with the outer surface of the top plate 13. The outer surface of the joining plate u2 is set to be substantially flush with the outer surface of the side plate 12. By comprising in this way, the upper position displacement prevention member M (U) does not protrude from the outer surface of the box culvert 1 in the earth and sand after being backfilled. For this reason, even when moving the entire box culvert 1 provided continuously in the axial direction, the upper misalignment prevention member M (U) does not exhibit useless anchor action.

  The lower side displacement prevention members M (S) are arranged in pairs near the left and right end portions of the outer surface of the bottom plate 11. The lower misalignment prevention member M (S) has a shape that fits into a lower recessed portion h <b> 2 provided at a corner formed by the bottom plate 11 and the side plate 12. In other words, the lower position shift prevention member M (S) is formed in a substantially L shape in a front view and a cross-sectional view, and is arranged in the bottom recessed portion h21 opened downward in the lower recessed portion h2. The lower surface contact plate s1 is provided, and the side surface contact plate s2 is provided on the side recessed portion h22 opened to the side in the lower recessed portion h2. The lower position displacement prevention member M (S) is made of metal, and the lower surface contact plate s1 and the side surface contact plate s2 forming the lower position displacement prevention member M (S) are integrally formed. ing. The lower displacement prevention member M (S) disposed in the lower recessed portion h2 is set so that the outer surface of the lower surface contact plate s1 is substantially flush with the outer surface of the bottom plate 11. The outer surface of the joining plate s2 is set so as to be substantially flush with the outer surface of the side plate 12. By configuring in this way, the lower position shift prevention member M (S) does not protrude from the outer surface of the box culvert 1 in the earth and sand after being backfilled. For this reason, even when the whole box culvert 1 provided continuously is moved in the axial direction, the lower position displacement prevention member M (S) does not exhibit unnecessary anchor action.

  The upper / lower position deviation prevention members M (U) and M (S) are formed with a round hole-shaped bolt insertion hole n1 at a portion of the adjacent box culvert 1 that comes into contact with one box culvert 1. A bolt insertion hole n2 having a long hole shape is formed in a portion that comes into contact with the other box culvert 1. The upper and lower position shift prevention members M (U) and M (S) are formed by a round hole-shaped bolt insertion hole n1 in a nut nt embedded in one of the adjacent box culverts 1. A bolt v, which is fixed to the box culvert 1 by screwing the bolt v inserted therethrough, is inserted into the nut nt embedded in the other box culvert 1, and is inserted into the elongated hole insertion hole n2. The box culvert 1 is attached to the box culvert 1 by being screwed. In other words, when the bolt v attached to the other box culvert 1 is subjected to an external event, a bolt insertion hole having a long hole shape corresponding to the relative movement of the other box culvert 1 relative to the one box culvert 1 is performed. It is configured to be able to slide n2.

  As shown in FIG. 15, the upper and lower misregistration preventing members M (U) and M (S) are water-soluble embedding materials in a long hole-like bolt insertion hole n2. A bond J embedded and cured to form a round hole-like bolt insertion hole n3 can be used.

  That is, the adjacent box culverts 1 are formed by using the water-soluble bond J for the long hole-shaped bolt insertion holes n2 formed in the upper and lower position displacement prevention members M (U) and M (S). At the time of mounting using both bolts v, it can be deformed into a round hole shape corresponding to the diameter of the bolt v.

  More specifically, as shown in FIG. 15, a portion where a round hole-shaped bolt insertion hole n3 is provided in the longitudinal middle portion of the long hole-shaped bolt insertion hole n2 extending in the left-right direction is set. Water-soluble bond J is injected into the left and right space portions and cured. Thereby, in the upper / lower position displacement prevention members M (U) and M (S), a round hole-like bolt using a part of the long hole-like bolt insertion hole n2 drilled in the steel material. An insertion hole n3 is provided. In other words, the upper and lower misregistration prevention members M (U) and M (S) exist at least in the laying step S1 and the misregistration prevention member mounting step S4, but after construction, that is, after being buried in the ground. Is provided with a round hole-shaped bolt insertion hole n3 that dissolves and disappears by underground water such as groundwater.

  If this is the case, in the laying step S1, the upper and lower misalignment prevention members M (U) and M (S) have a round hole-like bolt insertion hole n3 and a nut nt provided in the box culvert 1 , The appropriate relative position (separation dimension) between adjacent box culverts 1 is set.

  In addition, after the underground structure K completed through the steps S1 to S4 is backfilled in the ground, the water-soluble bond J that has hardened in the long hole-shaped bolt insertion hole n2 is formed in the groundwater or the like. It will be dissolved by the water inside. That is, after the underground structure K is backfilled in the ground, the hardened water-soluble bond J disappears while being softened, and the elongated hole insertion hole n2 can exhibit its original function as a long hole. Will return to things. That is, the upper and lower position displacement prevention members M (U) and M (S) are fixed to one box culvert 1 and can be moved relative to the other box culvert 1. It will be attached.

  In other words, the upper and lower misalignment prevention members M (U), M (S) are round hole-like bolt insertion holes n1 through which bolts v for attaching to the adjacent one and other box culverts 1 are inserted, and , Having a long hole-shaped bolt insertion hole n2, wherein the position displacement prevention members M (U), M (S) are connected to one box culvert by a bolt v passing through the round hole-shaped bolt insertion hole n1. 1 and is attached to the other box culvert 1 by a bolt v passing through a long hole-like bolt insertion hole n2, and at least before the joined box culvert 1 is backfilled into the ground, it has a long hole shape. A water-soluble bond J, which is a hardened water-soluble embedding material, is embedded in the bolt insertion hole n2 and the inside of the elongated hole insertion hole n2 is formed by the water-soluble bond J. It has become one round hole-shaped bolt insertion holes n3 is formed.

  Next, a method for joining the box culvert 1 will be described in detail.

<Laying process S1>
The laying step S1 is a step of laying a plurality of box culverts 1 having the same shape with a predetermined gap w. The plurality of box culverts 1 are conveyed by a crane or the like. The plurality of box culverts 1 are disposed, for example, with a predetermined gap w at a predetermined position on the foundation concrete previously placed. When the propulsion method is used, the conveyed box culvert 1 is disposed at a predetermined position by using a pressing force by a jack.

<Position displacement prevention member mounting step S4>
The misalignment prevention member mounting step S4 is performed after the transport step S1, and a plurality of upper and lower side surfaces of the adjacent box culverts 1 are connected to each other. This is a step of attaching the misalignment prevention members M (U) and M (S).

  For example, as shown in FIG. 5, a lower positional displacement prevention member M (S) is attached in advance to the left and right of the box culvert 1 being conveyed, and a predetermined gap w is formed between the other box culverts 1. If the box culvert 1 being transported is transported to a position where it can be performed, positioning with the adjacent box culverts 1 can be suitably performed.

  Note that the misalignment prevention member attaching step S4 may be after the backup material installing step S2 or the adhesive injection step S4.

<Backup material installation process S2>
The backup material installation step S2 is performed after the laying step S1 and the misalignment prevention member attachment step S4, and between the separated end faces 1a of the adjacent box culverts 1 and the non-backup material 31 This is a process of forming the backup material interposing part 3 by installing the inner backup material 32 which is a polar material backup material. In the backup material installation step S <b> 2, in order to form the backup material interposition part 3, first, the outer backup material 31 is arranged on the outside, and then the inner backup material 32 is arranged on the inner side of the outer backup material 31.

<Adhesive injection step S3>
The adhesive injection step S3 is performed after the laying step S1, the misalignment prevention member attaching step S4, and the backup material installing step S2, and the resin bonding is performed between the spaced end faces 1a of the adjacent box culverts 1. This is a step of forming the joint 2 that injects the agent B and connects the end faces 1a to each other. Adhesive injection process S3 has the procedure which inject | pours the resin adhesive B inside the inner backup material 32, and waits until the said resin adhesive B solidifies and the junction part 2 is formed.

  The resin adhesive B is injected from the inner space 1 s side of the box culvert 1. After the resin adhesive B is injected into the gap w between the adjacent box culverts 1, masking using a masking tape or the like is performed at a position substantially flush with the inner surface of the box culvert 1. Before the resin adhesive B is injected and the resin adhesive B is solidified, the masking tape is removed to cancel the masking.

  A plurality of box culverts 1 are connected through the steps S1, S2, S3, and S4 described above. As a result, the internal space 1s communicates, and an underground structure K used for a water channel, a passage, or the like is formed. The external structure that can damage the joint state of the box culverts 1 joined to the underground structure K, that is, the natural world such as subsidence of the foundation ground, non-subsidence of the foundation ground, earthquake, buoyancy due to groundwater, etc. When an artificial event such as an unloading load at the time of backfilling or an external force received during the propulsion method is applied, the displacement prevention members M (U) and M (S) The joint 2 which is a layer formed by the resin adhesive B is appropriately elastically deformed mainly in the axial direction while suppressing the shift in the orthogonal direction. Therefore, even if the relative positions of the adjacent box culverts 1 are changed by the joint portion 2 formed by the resin adhesive B, the continuity and water tightness of the joint portion 2 are maintained. That is, if the joining method of the box culvert 1 shown in this embodiment is used, it is possible to easily impart seismic resistance, continuity and water tightness to structures such as waterways and passages using concrete products at low cost. . In addition, according to this joining method, a primer is not necessarily required, so that the number of man-hours and the construction period can be shortened. Needless to say, a primer may be appropriately used according to the construction situation.

  As described above in detail, the method for joining the box culverts 1 which are concrete structures in the present embodiment is such that each internal space 1s communicates with a plurality of box culverts 1 having a substantially rectangular tube shape forming the internal space 1s. To be joined. Then, a laying step S1 for laying a plurality of box culverts 1 with a predetermined gap w, and a joint portion for injecting a resin adhesive B between the spaced end faces 1a of adjacent box culverts 1 to connect the end faces 1a to each other Adhesive injection step S3 for forming 2 and upper surface attachment plate u1, side surface attachment plates u2, s2, and lower surface attachment plate s1 which are attachment plates having dimensions capable of being attached to both adjacent box culverts 1 respectively. A misalignment preventing member attaching step S4 for attaching four misalignment preventing members M (U) and M (S) for connecting the upper surfaces, the side surfaces, and the bottom surfaces of the adjacent box culverts 1 that are mainly configured. I have. The displacement prevention members M (U) and M (S) are fixed to one box culvert 1 of adjacent box culverts 1 and can be operated relative to the other box culvert 1. Is attached.

  For this reason, even when an external event occurs, it is possible to provide a method for joining concrete structures in which the joined state of the joined box culverts 1 can be suitably maintained.

  That is, since the joining part 2 is formed by the resin adhesive B, it is possible to easily and inexpensively provide earthquake resistance, continuity, and water tightness to a water channel or a passage using the tubular box culvert 1. Can be provided.

  Moreover, by setting the resin adhesive B to an appropriate value according to the construction location, it is possible to provide a material having excellent workability. For example, if the density of the resin adhesive B is set to a relatively small value, the resin adhesive B does not sag at the time of construction, so that the workability is excellent. In addition, if the elongation capacity of the resin adhesive B is set to a high value, even if an external event such as non-settlement or displacement of the ground during an earthquake occurs, the joint made by the resin adhesive B It follows that the box culvert 1 in which 2 is displaced and is appropriately deformed to follow and secure continuity and watertightness.

In a state where the resin adhesive B adheres adjacent box culverts 1 to each other, the elongation capacity is 1% to 500%, the hardness is 10 to 95, the viscosity is 100 to 500,000 mPa · s, the thixotropy ratio is 1 to 5, The adhesive strength is set to a value of 0.1 to 10.0 N / mm ² and the density is set to 0.5 to 2.0 g / cm ³ . For this reason, the suitable junction part 2 can be formed according to various conditions of a construction location.

  When the elongation capacity is less than 100%, the allowable displacement becomes small, so the space between the box culverts 1 is compared in order to appropriately respond to external events, that is, non-uniform subsidence and ground displacement during an earthquake. Therefore, it is necessary to inject a large amount of the resin adhesive B. That is, in the case where the resin adhesive B having a relatively low elongation capacity is used, it is necessary to set a relatively large space in order to ensure the amount of elongation of the resin adhesive B that is assumed in advance. Further, when the elongation capacity exceeds 300%, assuming that the volume of the resin adhesive B before and after the displacement is not substantially changed, a portion where the adhesive becomes thin after the displacement is formed, and this thickness is reduced. It is necessary to inject a large amount of resin adhesive B in order to ensure that the resistance to external forces such as water pressure and earth pressure at the part is reduced and problems such as water leakage are likely to occur and the resistance after displacement is secured. There is a problem that there is. 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 resin adhesive B is less 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.

  The plurality of box culverts 1 have a substantially rectangular tube shape, and a plurality of misalignment prevention members M (U) and M (S) are provided. Then, the misalignment prevention members M (U) and M (S) connect the upper surfaces, the left and right side surfaces, and the bottom surfaces of the adjacent box culverts 1 to each other. For this reason, relative displacement in the axial direction (shear direction) orthogonal to the axial direction can be prohibited while allowing relative displacement in the axial direction between the plurality of box culverts 1.

  In particular, in this embodiment, the two upper misalignment prevention members M (U) are provided in a state where they are arranged and separated at two locations, the upper left corner and the upper right corner of the adjacent box culvert 1. At the same time, two lower-position misalignment prevention members M (S) are provided in a state of being separated from each other at two positions, the lower left corner and the lower right corner of the adjacent box culvert 1. For this reason, the upper / lower position shift prevention members M (U) and M (S) can be easily attached to the adjacent box culverts 1.

  The present invention is not limited to the embodiment described above.

  Various types of box culverts can be applied. For example, as shown in FIG. 13 and FIG. 14, a recessed portion 1 k that is a recessed portion is formed in a portion facing the internal space 1 s at the opening end of the bottom plate 11, the side plate 12, and the top plate 13. It may be formed. The recessed portion 1k includes an end surface 1a that is a surface facing the other adjacent box culvert 1 and an inward surface 1u that faces the internal space 1s. With such a configuration, the joint portion 2 formed by the inner backup material 32 and the resin adhesive B is disposed in the space between the opposing end surfaces 1a formed by the recessed portion 1k. In addition, the recessed part 1k may be formed in both sides in the adjacent box culvert 1 as shown in FIG. 13, and may be formed only in one side as shown in FIG. .

It goes without saying that various resin adhesives can be applied as long as they do not depart from the spirit of the present invention. For example, in a state in which the resin adhesive bonds adjacent concrete structures, the elongation capacity is 1% to 500%, the hardness is 10 to 95, the viscosity is 100 to 500,000 mPa · s, and the thixotropy ratio is 1 to 5. The adhesive strength is preferably 0.1 to 10.0 N / mm 2 and the density is set to a value of 0.5 to 2.0 g / cm ³ , but is not limited thereto.

  Concrete structures are not limited to box culverts. Concrete structures include, for example, manholes and fume pipes. In other words, the concrete structure is not limited to a rectangular tube shape or a U shape, and may be, for example, a cylindrical shape or a semicylindrical shape.

  The method of joining concrete structures is applicable not only when a plurality of box culverts that make up an underground structure are all newly installed, but also when joining only a part of them to existing box culverts or on-site concrete structures. can do. In addition, the method for joining concrete structures can be applied to join adjacent box culverts even when the plurality of box culverts constituting the underground structure are all existing ones.

  Various types of misalignment prevention members can be applied. For example, as a displacement prevention member, a simple plate-like member is attached to the upper surface, the left and right side surfaces, and the bottom surfaces of the adjacent outer peripheral surface or inner peripheral surface of adjacent concrete structures. Also good. In addition, as a misalignment prevention member, H steel or channel steel (grooved steel) is applied to the adjacent outer peripheral surfaces or inner peripheral surfaces of adjacent concrete structures, the left and right side surfaces, and the bottom surfaces. You may make it attach.

  In the embodiment described above, the misalignment preventing member is fixed to one side of the adjacent concrete structure by the bolt, but may be fixed by a method other than the bolt. Moreover, the position shift prevention member should just be attached to the other surface in the adjacent concrete structure surface. That is, the misalignment prevention member may not be attached to the other concrete structure using a bolt.

  The position shift prevention member is not limited to the one attached to the outer peripheral surface of the adjacent box culvert, and may be one attached to the inner peripheral surface of the adjacent box culvert.

  The box culvert may be one in which the portion on which the displacement prevention member is disposed is not recessed.

  Of course, adjacent box culverts may be prestressed by PC steel.

  In addition, about each structure of this invention, it can change variously in the range which does not deviate from the meaning.

1 ... Box culvert (concrete structure)
2 ... Joint part B ... Resin adhesive 3 ... Backup material interposed part

Claims (3)

A concrete structure joining method for joining a plurality of concrete structures having a cylindrical shape or U-shape forming an internal space so that the internal space communicates,
A laying step of laying a plurality of the concrete structures with a predetermined gap;
Adhesive injection step of injecting a resin adhesive between spaced end faces in adjacent concrete structures to form a joint for connecting the end faces;
One or a plurality of misalignment prevention members for connecting at least the side surfaces and the bottom surfaces of the adjacent concrete structures which are mainly composed of an attachment plate having a size capable of being attached to both adjacent concrete structures. A position displacement prevention member mounting step for mounting,
A method of joining a concrete structure, wherein the displacement prevention member is fixed to one concrete structure and is attached to the other concrete structure so as to be capable of relative movement. With the resin adhesive bonding adjacent concrete structures, the elongation capacity is 1% to 500%, the hardness is 10 to 95, the viscosity is 100 to 500,000 mPa · s, the thixotropy ratio is 1 to 5, The method for joining concrete structures according to claim 1, wherein the adhesive strength is set to a value of 0.1 to 10.0 N / mm ² and the density is set to 0.5 to 2.0 g / cm ³ . The plurality of concrete structures are substantially rectangular tube-shaped,
A plurality of the positional deviation prevention members are provided,
The method for joining concrete structures according to claim 1 or 2, wherein the displacement prevention member connects upper surfaces, left and right side surfaces, and bottom surfaces of adjacent concrete structures.

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