Water stop structure

Abstract

To provide a water stop structure with high water-tightness and workability at a connection part between concrete members.SOLUTION: A water stop structure at a connection part of a pair of concrete members comprises: a pair of connection surfaces in which the pair of concrete members face each other across a joint part; a water stop seal member inserted into the joint part; and a time-hardening material filled in the joint paty. Each of the pair of connection surfaces is provided with an uneven portion, to form a bypass resistance path for water intrusion at a boundary between the connection surfaces and the joint part, and an outer surface of the water stop seal member is entirely covered with the pair of concrete members and the time-hardening material.SELECTED DRAWING: Figure 14

Description

[Technical Field]

[0001] The present invention relates to a waterproof structure at a joint between concrete members. [Background technology]

[0002] When constructing various underground structures such as underground tunnels, utility conduits, and underground parking lots, as well as various other concrete structures, construction involves connecting multiple concrete members to construct the structure. In such cases, it is known that the concrete members used are prefabricated in factories, for example, so-called precast concrete members.

[0003] For example, Patent Document 1 discloses a connection structure for precast plates that is used when connecting bridge decks. The technology described in Patent Document 1 aims to allow for rotational deformation in the connection structure, improve workability during construction, and increase responsiveness in shear force transmission.

[0004] Furthermore, for example, Patent Document 2 discloses a method for constructing a precast reinforced concrete underground structure. The technology described in Patent Document 2 improves the quality of the constructed exterior walls and shortens the construction period.

[0005] Furthermore, for example, Patent Document 3 discloses a sealing material for use when filling mortar into the joints of precast concrete members. The technology described in Patent Document 3 prevents mortar from seeping into the joints when filling the gaps between the joints with mortar. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-42545 [Patent Document 2] Japanese Patent Application Publication No. 9-279609 [Patent Document 3] Japanese Utility Model Application Publication No. 5-47216 Summary of the Invention [Problem to be solved by the invention]

[0007] As exemplified by Patent Documents 1 to 3, in connection structures between precast concrete members, a sealant is placed at the connection (joint) and a time-hardening material such as mortar or grout is filled in. In technologies requiring the connection of such concrete members, a known method is to embed waterproof rubber at the interface of cast-in-place concrete joints and connect the cast-in-place concrete, in order to provide high water impermeability and waterproofing properties to the concrete joint itself. Another known method is to place a sealant at the interface of precast concrete joints and compress the sealant with PC (prestressed concrete) steel bars.

[0008] In general structures that require the connection of concrete members, the watertightness of cast-in-place waterproof rubber is about 0.5 MPa, while that of precast sealant is about 0.3 MPa. However, special equipment structures, such as the flue gas ducts of coke ovens in steelworks, require even higher watertightness. Specifically, they require watertightness of about 1.0 MPa, as well as manpower and labor savings during construction and shorter construction times.

[0009] In view of the above circumstances, an object of the present invention is to provide a waterproof structure that has high watertightness and ease of construction at the joints between concrete members. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, according to the present invention, there is provided a water-stopping structure at the connection of a pair of concrete members, comprising a pair of connection surfaces where the pair of concrete members face each other across a joint portion, a water-stopping seal member inserted into the joint portion, and a time-dependent hardening material filled in the joint portion, wherein each of the pair of connection surfaces is provided with an uneven portion, thereby forming a bypass resistance path for infiltrating water at the boundary between the connection surfaces and the joint portion, and the outer surface of the water-stopping seal member is entirely covered by the pair of concrete members and the time-dependent hardening material.

[0011] PC steel rods may be provided through the pair of concrete members in a direction intersecting the connection surface, and by applying tension to the PC steel rods, compressive force may be applied to the waterproof seal member and the joint portion.

[0012] The waterproof sealing member may be composed of a pair of sealing member portions attached to each of the pair of connecting surfaces, and the pair of sealing member portions may be butted together and integrated, and then covered with the time-hardening material.

[0013] Of the pair of connecting surfaces, one connecting surface may have a first groove-shaped recess, and the other connecting surface may have a second groove-shaped recess at a position opposite to the first groove-shaped recess, and a joint portion may be formed that includes an approximately cylindrical groove formed by butting together the first groove-shaped recess and the second groove-shaped recess.

[0014] Of the pair of connecting surfaces, one connecting surface may have a groove-shaped recess, and the other connecting surface may have a step-shaped protrusion at a position opposite the groove-shaped recess, and the joint portion may be sandwiched between the groove-shaped recess and the step-shaped protrusion and bent in a keyhole shape. [Effects of the Invention]

[0015] According to the present invention, a waterproof structure having high watertightness and workability is realized at the connection between concrete members.

[0016] The above effects are not necessarily limiting, and any of the effects shown in this specification or other effects that can be understood from this specification may be achieved in addition to or instead of the above effects. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic overhead view showing the configuration of a concrete structure. [Figure 2] FIG. 1 is a schematic front view of a concrete structure. [Figure 3] FIG. 1 is a schematic plan view of a concrete structure. [Figure 4] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 5] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 6] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 7] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 8] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 9] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 10] FIG. 1 is a schematic explanatory diagram showing a method for constructing a concrete structure. [Figure 11] FIG. 1 is a schematic cross-sectional view of a precast member. [Figure 12] FIG. [Figure 13] FIG. 2 is a schematic overhead view showing an example of the configuration of a water stopping structure. [Figure 14] FIG. 2 is a schematic plan view showing an example of the configuration of a water stopping structure. [Figure 15] FIG. 10 is a schematic overhead view showing an example of the configuration of a water stopping structure according to another embodiment. [Figure 16] FIG. 10 is a schematic plan view showing a configuration example of a water stopping structure according to another embodiment. [Figure 17] FIG. 1 is a schematic explanatory diagram of a test device according to an embodiment. [Figure 18] 1 is a flowchart showing the steps of a test. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration may be designated by the same reference numerals to avoid repetitive explanation. For the sake of explanation, in this specification and the drawings, some components may be omitted from illustration, or the internal configuration of a component may be illustrated.

[0019] <Concrete structure composition> Fig. 1 is a schematic overhead view showing the configuration of a concrete structure 10 equipped with a water stop structure 1 according to an embodiment of the present invention. Fig. 2 is a schematic front view of the concrete structure 10, and Fig. 3 is a schematic plan view of the concrete structure 10. In this specification, an underground structure used as a flue for a coke oven is illustrated as an example of the concrete structure 10, and the direction in which the flue extends will be described as the longitudinal direction.

[0020] 1 and 2, the concrete structure 10 includes a cast-in-place section 20 as a substructure consisting of a pair of cast-in-place concrete members 20a, 20b arranged at a predetermined distance, a precast section 30 as a superstructure arranged on top of the cast-in-place section 20, and a top slab 40 arranged on the top surface of the precast section 30. As shown in the figures, the cast-in-place section 20 is made up of cast-in-place concrete members 20a, 20b erected at a predetermined distance, with the arch-shaped precast section 30 installed on top of it, and an internal space U being formed inside.

[0021] The precast section 30 and the cast-in-place section 20 are connected and installed by placing an anchor rebar 25 at the top end of the cast-in-place section 20 and filling a gap 31 formed at the connection between the two with non-shrinkage mortar to bury the anchor rebar 25. The precast section 30 is also composed of multiple arch-shaped precast members 30a arranged adjacent to each other in the longitudinal direction.

[0022] The top plate 40 is formed on the upper surface of the precast section 30, for example, by pouring cast-in-place concrete. A chimney 32 capable of discharging exhaust gases and the like may be formed on the upper surface of the concrete structure 10. In this case, an exhaust port for the chimney 32 is formed in advance on the upper surface of the precast section 30, and the top plate 40 is constructed accordingly, and the chimney 32 is provided by attaching embedded metal fittings or the like to the exhaust port. The chimney 32 may be provided with an adjustment valve (not shown) for adjusting the pressure inside, for example, to apply negative pressure to suppress gas emissions.

[0023] The internal space U of the underground structure (concrete structure 10) used as the flue of the coke oven may be placed under a high negative pressure of, for example, −0.2 MPa to −0.8 MPa during operation. Since the internal space U may become hot, a refractory layer S (not shown in FIG. 1) may be provided to surround the internal space U of the concrete structure 10, as shown in FIG. 2.

[0024] <Concrete structure construction method> Next, a method for constructing the concrete structure 10 according to this embodiment will be described with reference to the drawings. Figures 4 to 10 are schematic explanatory diagrams showing the method for constructing the concrete structure 10, illustrating the gradual progress of construction.

[0025] First, as shown in FIG. 4, a pair of cast-in-place concrete members 20a, 20b are installed with a predetermined distance between them. Next, as shown in FIG. 5, multiple anchor rebars 22 are installed at the top ends of the cast-in-place concrete members 20a, 20b. Next, as shown in FIG. 6, multiple arch-shaped precast members 30a are installed longitudinally across the pair of cast-in-place concrete members 20a, 20b. At this time, the precast members 30a are installed so that the anchor rebars 22 are accommodated in the gaps 31 formed at the bottom ends of the precast members 30a. As shown in the figure, various rebars, such as main rebars 33, distribution bars 35, and shear reinforcement bars 37, which will be placed inside the top plate 40 to be cast in a process described below, may be embedded in the upper part of the precast member 30a.

[0026] Next, as shown in Figure 7, installation work, such as pulling multiple precast members 30a together in the longitudinal direction, is performed, and each precast member 30a is installed in a predetermined position on top of the cast-in-place concrete members 20a, 20b. The pulling of multiple precast members 30a together may also be performed using couplers or PC steel rods in anchoring boxes 38 formed in one or more locations on the side walls of the precast members 30a. For example, as shown in Figure 7, a PC steel rod 39 may be passed through the interior of the precast members 30a, pulled together, and temporarily fixed, and then a time-hardening material (described later) may be filled in and allowed to harden.

[0027] Next, as shown in Figure 8, gap 31 formed at the bottom end of precast member 30a is filled with a time-hardening material such as mortar while anchor rebar 22 is housed therein, thereby connecting precast member 30a to cast-in-place concrete members 20a, 20b. At the same time, joints 50, which serve as gaps formed at the connections between multiple precast members 30a installed in the longitudinal direction, are filled with a time-hardening material such as mortar. Note that when filling the time-hardening material, components such as a sealant or formwork (not shown) may be placed around the gaps before the filler is injected or poured.

[0028] Next, as shown in Figure 9, cast-in-place concrete is poured to cover the top surfaces of the multiple precast members 30a, constructing the top plate 40. At this time, the chimney 32 may also be formed. Then, as shown in Figure 10, finishing work such as filling the anchorage box 38 with mortar is carried out, completing the construction of the concrete structure 10.

[0029] Here, the concrete structure 10 according to this embodiment is an underground structure used as a flue for a coke oven, and is surrounded by soil. Therefore, leakage of groundwater in the soil into the internal space U of the concrete structure 10 becomes a problem. In particular, in a flue, negative pressure is sometimes applied to the inside to suppress gas emissions, and the difference between the internal pressure and the external pressure is, for example, 0.5 MPa to 1.0 MPa. Therefore, in a precast section 30 formed by connecting multiple precast members 30a, high watertightness (water-stopping ability) is required for the joints 50 formed at the connection parts.

[0030] Therefore, the present inventors have conducted extensive research into the specific configuration of the waterproof structure at the joints 50 formed at the connections between multiple precast members 30a, and have devised a waterproof structure that is highly watertight and easy to install. The configuration of the waterproof structure 1 according to this embodiment will be described below.

[0031] <Example of joint configuration between precast members> Fig. 11 is a schematic cross-sectional view of a precast member 30a, and Fig. 12 is a schematic plan view of a joint 50 at a connection between adjacent precast members 30a. That is, Fig. 12 illustrates the AA plane in Fig. 11.

[0032] 12, the opposing surfaces of adjacent precast members 30a forming a pair of concrete members are configured as a pair of connecting surfaces 55, 56 with a joint portion 50 in between. A waterproof seal member 60 is inserted into the joint portion 50. The waterproof seal member 60 may be configured, for example, from a pair of sealing member portions 60a, 60b, or the waterproof seal member 60 may be configured by a state in which these sealing member portions 60a, 60b are butted together and integrated.

[0033] The waterproof seal member 60 may be inserted at any position in the joint 50, for example, at its approximate center. That is, the seal member portion 60a may be attached to the approximate center of the connection surface 55, and the seal member portion 60b may be attached to the approximate center of the connection surface 56.

[0034] As described above, when constructing the concrete structure 10, a time-hardening material such as mortar is filled into the joints 50 at the connections between the precast members 30a. That is, when adjacent precast members 30a are connected, the joints 50 are filled with a time-hardening material P (not shown in FIG. 12 ), and the outer surface of the waterproof seal member 60 is completely covered with the precast members 30a and the time-hardening material P.

[0035] Furthermore, the pair of connection surfaces 55, 56 are each provided with an uneven portion, and a bypass resistance path for infiltrating water is formed at the boundary between the connection surfaces 55, 56 and the joint portion 50. The shape of the uneven portion provided on the connection surfaces 55, 56 is arbitrary. In FIG. 12, As an example of recesses provided in both 55 and 56, a case where a substantially cylindrical groove 70 is formed is shown. Examples of the shape of the recesses and the configuration of the bypass resistance path formed thereby will be described later with reference to Figures 13 to 16. Note that a roughening treatment may be applied to a portion of the surface of the connecting surfaces 55 and 56. The roughening treatment depth may be, for example, about 1 to 3 mm. This improves the unity with the time-curable hardening material P that has been filled into the joint portion 50 and solidified.

[0036] In addition to the waterproof seal member 60, an additional seal material may be provided in the joint 50. For example, as shown in Fig. 12, seal materials 72 and 73 may be provided at both ends of the joint 50 in plan view. Furthermore, since the time-curing hardening material P is filled in the joint 50 with the waterproof seal member 60 provided, it is preferable that the gap width be, for example, about 20 mm to 40 mm.

[0037] <Example of water-stopping structure configuration> As described above, when constructing the concrete structure 10, a pair of adjacent concrete members (precast members 30a, 30a) are connected using a watertight seal member 60 entirely covered with concrete to achieve high watertightness at the joint 50 of the connection, and a watertight structure is constructed that includes a bypass resistance path for water intrusion. Here, the configuration of the watertight structure 1 constructed in this manner will be described. In the following, in order to generally explain a portion of the structure (the connection point between members), the pair of concrete members to be connected are schematically illustrated as C1 and C2.

[0038] Fig. 13 is a schematic overhead view showing an example of the configuration of the waterproof structure 1 according to this embodiment, and for the sake of explanation, the concrete members C1 and C2 are shown separated from each other. Fig. 14 is a schematic plan view showing the example of the configuration of the waterproof structure 1.

[0039] The opposing surfaces of the concrete members C1 and C2 are configured as a pair of connecting surfaces 55 and 56, sandwiching a joint 50 between them. A waterproof seal member 60 is attached to at least one of the connecting surfaces 55 and 56. The waterproof seal member 60 may be attached using, for example, an adhesive. The waterproof seal member 60 may be water-swellable, absorbing moisture in the mortar and expanding. The waterproof seal member 60 may be a single member, or may be configured by stacking two sealing materials. For example, as shown in FIG. 14, the waterproof seal member 60 may be configured by a pair of sealing member portions 60a and 60b, or these sealing member portions 60a and 60b may be butted together to form the waterproof seal member 60.

[0040] Furthermore, a first groove-shaped recess 80 is provided in the connecting surface 55. A second groove-shaped recess 82 is provided in the connecting surface 56 at a position opposite the first groove-shaped recess 80. The number and arrangement of these first groove-shaped recesses 80 and second groove-shaped recesses 82 are arbitrary, and for example, they may be provided in two locations as shown in the figure. The first groove-shaped recess 80 and the second groove-shaped recess 82 may have a substantially semicircular shape in a plan view, and these recesses 80, 82 may be butted against each other so as to face each other, thereby forming a substantially cylindrical groove.

[0041] In this way, a bypass resistance path for infiltrating water is formed at the boundary between the connection surfaces 55, 56 and the joint portion 50 by providing the first groove-like recess 80 and the second groove-like recess 82. This allows the infiltration path of infiltrating water to be longer than a straight path, thereby improving water impermeability and waterproofing properties.

[0042] Furthermore, as shown in Figure 14, one or more PC steel rods 90 may be inserted through the concrete members C1 and C2 in a direction intersecting the connection surfaces 55 and 56, and tension may be applied to the PC steel rods 90, thereby applying compressive force to the waterproof seal member 60 and the joint portion 50.

[0043] <Effects of this embodiment> According to the watertight structure 1 and concrete structure 10 including the same according to the present embodiment described above, a watertight seal member 60, the outer surfaces of which are covered with concrete members C1 and C2 and a time-curing hardening material P, is disposed in the joint 50 between concrete members C1 and C2. Additionally, a bypass resistance path is formed at the boundary between the connection surfaces 55 and 56 and the joint 50, lengthening the water penetration path. This configuration improves water impermeability and watertightness, achieving high watertightness of, for example, 0.5 MPa to 1.0 MPa. Furthermore, the recesses 80 and 82 are butted together to form a substantially cylindrical groove, forming a bypass resistance path, and the time-curing hardening material P filled therein provides a shear key effect.

[0044] Furthermore, in the water-stopping structure 1 according to this embodiment, a roughening treatment may be applied to a portion of the surface of the connecting surfaces 55, 56. This improves the unity with the time-dependent hardening material P that has been filled into the joint portion 50 and solidified, thereby further improving the water-stopping property.

[0045] Furthermore, in the waterproof structure 1 according to this embodiment, the waterproof seal member 60 may be composed of a pair of seal member portions 60a, 60b, or these seal member portions 60a, 60b may be integrated in a butted state. In either case, by using a water-expandable sealant, when the mortar is filled into the joints and solidifies, it absorbs water in the mortar and expands, increasing the contact pressure between the sealants or between the sealant and the concrete, thereby further improving waterproofing.

[0046] As described above, when constructing the concrete structure 10, a plurality of pre-fabricated precast members 30a are connected to form the precast section 30. In other words, the use of the precast members 30a can improve workability and member transportability, thereby improving productivity.

[0047] While one embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment. It is clear that a person skilled in the art can conceive of various modifications and alterations within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0048] Furthermore, the effects described herein are merely descriptive or exemplary and are not limiting. In other words, the technology according to the present disclosure may achieve other effects that are apparent to those skilled in the art from the description of this specification, in addition to or in place of the above-described effects.

[0049] <Another embodiment of the present invention> In the water-stopping structure 1 according to the above embodiment, a case has been illustrated and described in which a bypass resistance path for infiltrating water is formed by providing the first groove-shaped recess 80 and the second groove-shaped recess 82 at the boundary between the connection surfaces 55, 56 and the joint portion 50, but the shape and configuration of the joint portion 50 are not limited to this. Below, other configurations of the joint portion 50 will be described as other embodiments of the present invention with reference to Figures 15 and 16.

[0050] Fig. 15 is a schematic overhead view showing an example of the configuration of a water-stopping structure 1a according to another embodiment of the present invention, and for the sake of explanation, the concrete members C1 and C2 are shown separated from each other. Fig. 16 is a schematic plan view showing the example of the configuration of the water-stopping structure 1a. Note that components having the same functional configuration as those in the above embodiment are shown with the same reference numerals, and their description may be omitted.

[0051] In the water stopping structure 1a according to this embodiment, a groove-shaped recess 100 is provided on the connection surface 55. Furthermore, a step-shaped protrusion 103 is provided on the connection surface 56 at a position opposite the recess 100. The number and arrangement of these recesses 100 and protrusions 103 are arbitrary, and for example, they may be provided in two locations as shown in the figure. As shown in FIG. 16, the joint portion 50 may be sandwiched between the recess 100 and the protrusion 103 and be bent in a keyhole shape.

[0052] In the water-stopping structure 1a according to this embodiment, by providing the recessed portion 100 and the protruding portion 103 in the joint portion 50 and configuring it to be bent like a keyhole as described above, a bypass resistance path for infiltrating water is formed at the boundary between the connection surfaces 55, 56 and the joint portion 50. As a result, as in the above embodiment, the infiltration path of infiltrating water can be made longer compared to a straight path, thereby improving water-blocking and water-stopping properties.

[0053] <Example> In order to confirm the effectiveness of the water stop structure according to the present invention, a water stop test was conducted using a test specimen consisting of a pair of concrete members. Fig. 17 is a schematic explanatory diagram of the test equipment according to this example. As shown in Fig. 17, water pressure was applied to a test specimen consisting of a pair of concrete members configured as a water stop structure according to the above embodiment using a water pressure plate, and a test was conducted to determine the water leakage state. Fig. 18 is a flow chart showing the test process, and the test was conducted according to this process.

[0054] Here, the leak confirmation test is a process in which a water pressure of 0.5 MPa is applied for 24 hours to check for the presence or absence of leaks. The permeability test is a process in which a water pressure of 0.5 MPa is applied for 72 hours to check the penetration depth and determine the permeability coefficient. The permeability coefficient k (m / s) is determined by the following formula (1). k=d 2 / 2ht ···(1) Here, d is the permeability depth (m), t is time (sec), h is the head (= P / 0.0098 m), and P is the external pressure (MPa). The permeability coefficient was 5.38 × 10, which is the value when a normal cast-in-place joint was used as the test specimen. -11 (m / s) or less. The short-term watertightness check is a process of applying a water pressure of 1.0 MPa for a short time (instantaneously) to check the watertightness.

[0055] Example 1 As test specimens, concrete members connected by the waterproof structure 1 (see Fig. 13 and Fig. 14) described in the above embodiment were used, and the test was carried out according to the process shown in Fig. 18. Here, when connecting the concrete members, the joints were filled with non-shrink grout material, and no surface roughening was performed.

[0056] Under the conditions of this Example 1, no water leakage occurred and the hydraulic conductivity was 3.37 × 10 -11 (m / s). It was confirmed that the sealant had sufficient water-stopping properties even under a water pressure of 1 MPa, and was suitable for use in underground structures such as coke oven flues.

[0057] Example 2 As test specimens, concrete members connected by the waterproof structure 1a (see Fig. 15 and Fig. 16) described in the other embodiment above were used, and the test was carried out according to the process shown in Fig. 18. Here, when connecting the concrete members, the joints were filled with non-shrink grout material, and no surface roughening was performed.

[0058] Under the conditions of this Example 2, no water leakage occurred and the hydraulic conductivity was 3.52 × 10 -11 (m / s). It was confirmed that the sealant had sufficient water-stopping properties even under a water pressure of 1 MPa, and was suitable for use in underground structures such as coke oven flues.

[0059] The following configurations also fall within the technical scope of the present invention. (1) A waterproof structure at the connection between a pair of concrete members, A pair of connection surfaces of the pair of concrete members facing each other across a joint portion; A waterproof seal member inserted into the joint portion; A time-curing material filled in the joint portion, By providing uneven portions on each of the pair of connecting surfaces, a bypass resistance path for infiltrating water is formed at the boundary between the connecting surfaces and the joint portion, A waterproof structure characterized in that the outer surface of the waterproof seal member is entirely covered by the pair of concrete members and the time-hardening material. (2) A PC steel rod is provided to penetrate the pair of concrete members in a direction intersecting the connection surface, The waterproof structure described in (1) is characterized in that a compressive force is applied to the waterproof seal member and the joint portion by applying tension to the PC steel rod. (3) The waterproof seal member is composed of a pair of seal member portions attached to the pair of connecting surfaces, respectively; The waterproof structure according to (1) or (2), characterized in that the pair of sealing member portions are butted together and integrated, and are covered with the time-hardening material. (4) Of the pair of connection surfaces, one connection surface is provided with a first groove-shaped recess, and the other connection surface is provided with a second groove-shaped recess at a position opposite to the first groove-shaped recess, A water-stopping structure according to any one of (1) to (3), characterized in that a joint portion is formed including an approximately cylindrical groove formed by butting together the first groove-shaped recess and the second groove-shaped recess. (5) Of the pair of connection surfaces, one connection surface is provided with a groove-shaped recess, and the other connection surface is provided with a step-shaped protrusion at a position opposite to the groove-shaped recess, The water-stopping structure according to any one of (1) to (3), characterized in that the joint portion is sandwiched between the groove-shaped recess and the step-shaped protrusion and bent in a keyhole shape. [Industrial Applicability]

[0060] The present invention can be applied to a waterproof structure at a joint between concrete members. [Explanation of symbols]

[0061] 1...Water-stopping structure 10...Concrete structures 20...On-site Casting Section 30...Precast section 30a...Precast members 40…Top plate part 50...Joint 55...Connection surface 56...Connection surface 60...Waterproof seal material 60a, 60b...sealing member parts 80...First groove-shaped recess 82...Second groove-shaped recess 90…PC steel bar 100...Groove-shaped recess 103...Stepped convex part C1, C2...Concrete members P…Time-curing material U…Internal space

Claims

1. A waterproof structure at a connection between a pair of concrete members, A pair of connection surfaces of the pair of concrete members facing each other across a joint portion; A waterproof seal member inserted into the joint portion; A time-curing material filled in the joint portion, By providing uneven portions on each of the pair of connecting surfaces, a bypass resistance path for infiltrating water is formed at the boundary between the connecting surfaces and the joint portion, A waterproof structure characterized in that the outer surface of the waterproof seal member is entirely covered by the pair of concrete members and the time-hardening material.

2. PC steel rods are provided to penetrate the pair of concrete members in a direction intersecting the connection surfaces, 2. The waterproof structure according to claim 1, wherein a compressive force is applied to the waterproof seal member and the joint portion by applying a tension force to the PC steel rod.

3. the waterproof seal member is composed of a pair of seal member portions attached to the pair of connecting surfaces, respectively; 3. The waterproof structure according to claim 1, wherein the pair of sealing member portions are abutted against each other and integrated together, and are covered with the time-hardening material.

4. a first groove-shaped recess is provided on one of the pair of connection surfaces, and a second groove-shaped recess is provided on the other connection surface at a position opposite to the first groove-shaped recess; The water-stopping structure according to claim 1 or 2, characterized in that a joint portion is formed including a substantially cylindrical groove formed by butting together the first groove-shaped recess and the second groove-shaped recess.

5. one of the pair of connection surfaces is provided with a groove-shaped recess, and the other connection surface is provided with a step-shaped protrusion at a position opposite to the groove-shaped recess, The water-stopping structure according to claim 1 or 2, wherein the joint portion is sandwiched between the groove-shaped recess and the step-shaped protrusion and bent in a keyhole shape.

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