Construction joint and induction joint combined structure for fair-faced concrete structure

Abstract

The utility model discloses a construction joint and induction joint combined structure for a fair-faced concrete structure, which belongs to the technical field of concrete construction and comprises a pre-pouring concrete structure, a post-pouring concrete structure, a template, an induction strip and a water stop belt. A gap is formed between the pre-pouring concrete structure and the post-pouring concrete structure; the template is provided with a pre-pouring template and a post-pouring template corresponding to the pre-pouring concrete structure and the post-pouring concrete structure; the induction strips are arranged in a gap between the pre-pouring concrete structure and the post-pouring concrete structure, the induction strips are connected with the formwork, the two induction strips are symmetrically arranged, and a gap is formed between the two induction strips; the water stop belt is arranged in a gap between the two induction strips, and the two ends of the water stop belt are arranged in the pre-pouring concrete structure and the post-pouring concrete structure respectively. The construction joints and the induction joints are combined, the sum of the overall number of the construction joints and the induction joints is reduced, and then the influence on the structural strength is reduced; and the sealant section and the waterproof putty section are jointly used as a plugging strip, so that the waterproof putty is prevented from cracking due to overlarge depth of the waterproof putty.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete construction, in particular to a construction joint and induced joint combined structure for a plain concrete structure. Background Art

[0002] A construction joint is the joint between the surfaces of concrete poured successively during the concrete pouring process, due to design or construction requirements for segmented pouring. A construction joint is not a physical "joint"; it simply exists because the later-poured concrete exceeds the initial setting time, creating a bonding surface with the earlier-poured concrete. This bonding surface is called a construction joint. Traditionally, when pouring concrete at a construction joint, the following considerations should be taken into account: 1. The compressive strength of the poured concrete should not be less than 2.5 MPa; 2. The hardened concrete surface should be roughened and rinsed clean, and kept moist, but without stagnant water; 3. Before pouring, a layer of cement mortar with the same mix ratio as the concrete should be laid at the construction joint, preferably 15 to 30 mm thick; 4. The concrete should be carefully compacted to ensure a tight bond between the new and old concrete.

[0003] Induced joints are designed to prevent random cracks in ultra-long concrete structures. Joints are placed at appropriate locations on the wall panels to effectively guide the cracks, ensuring they do not leak, and to guide the irregular cracks to the designated locations. In the construction of ultra-long exposed concrete structures, a large number of induced joints are necessary to prevent cracking and water seepage, and construction joints are unavoidable. A large number of induced joints and construction joints significantly reduces the overall strength of the concrete structure. Furthermore, using traditional single slurry to fill induced joints can easily crack if the slurry is filled too deeply, affecting the overall aesthetics of the exposed concrete structure. Utility Model Content

[0004] The purpose of the utility model is to provide a combined structure of construction joints and induced joints for fair-faced concrete structures, so as to solve the problems in the above-mentioned background technology of the influence of induced joints and construction joints on structural strength, limiting the number of induced joints, affecting the structure's ability to resist cracking and water seepage, and the problem that cracking easily occurs when the induced joints are filled with a single slurry.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A combined construction joint and induced joint structure for a plain concrete structure comprises a pre-cast concrete structure, a post-cast concrete structure, a formwork, an induction strip and a waterstop; a gap is provided between the pre-cast concrete structure and the post-cast concrete structure; the formwork is provided with a pre-cast formwork and a post-cast formwork corresponding to the pre-cast concrete structure and the post-cast concrete structure; the induction strip is provided in the gap between the pre-cast concrete structure and the post-cast concrete structure to form an induced joint at the construction joint position, the induction strips are connected to the formwork and are symmetrically provided in two pieces with a gap provided between the two induction strips; the waterstop is provided in the gap between the two induction strips, and the two ends are respectively provided in the pre-cast concrete structure and the post-cast concrete structure.

[0007] Furthermore, it also includes a blocking strip, which is arranged in the induction seam after the induction strip is removed.

[0008] Furthermore, the sealing strip includes a sealant section and a waterproof putty section from the inside to the outside.

[0009] Furthermore, the induction strip is arranged vertically throughout, including a limiting portion and an inserting portion; the limiting portion and the inserting portion are arranged in a cross shape; the limiting portion is fixed on the formwork; the inner end of the inserting portion is arranged in the gap between the first cast concrete structure and the later cast concrete structure.

[0010] Furthermore, the cross-sectional width of the insertion portion gradually narrows as it approaches the inner end, and through holes are provided at intervals from top to bottom at the outer end.

[0011] Furthermore, the waterstop includes a main body, a telescopic portion and a collar; the telescopic portion is arranged in the middle of the main body, is a hollow structure, and is in contact with the two insertion portions; the collar is arranged at intervals on the main body on both sides of the telescopic portion.

[0012] Furthermore, an additional template is provided outside the first cast template, and the additional template includes glass glue and a limiting plate, and the limiting plate is fixedly connected to the first cast template; the glass glue is provided between the limiting plates; and the water stop strip passes through the glass glue.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model provides a combined structure of construction joints and induced joints for fair-faced concrete structures, which combines construction joints and induced joints to reduce the total number of the two, thereby reducing the impact on structural strength and improving the crack and impermeability resistance of fair-faced concrete.

[0015] 2. The utility model provides a combined construction joint and induced joint structure for a plain concrete structure, which uses a sealant segment and a waterproof putty segment as a sealing strip, thereby reducing the forming depth of the waterproof putty and avoiding cracking of the waterproof putty due to excessive depth.

[0016] 3. The utility model provides a combined structure of construction joints and induced joints for fair-faced concrete structures. During the construction of the first concrete pouring, a waterstop is pre-buried, and an additional formwork is set outside the first concrete pouring formwork. The waterstop is sealed with glass glue to ensure the pouring effect of the first concrete pouring structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the combined structure involved in the utility model;

[0018] Figure 2 This is a schematic diagram of the construction process of the waterstop involved in the utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the blocking strip involved in the utility model.

[0020] In the figure: 1-pre-cast concrete structure, 2-post-cast concrete structure, 3-formwork, 4-induction strip, 41-limiting part, 42-insertion part, 5-waterstop, 6-sealing strip. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the utility model provides a construction joint and induced joint combination structure for a plain concrete structure, comprising a pre-cast concrete structure 1, a post-cast concrete structure 2, a formwork 3, an induction strip 4, a waterstop 5 and a sealing strip 6; a gap is set between the pre-cast concrete structure 1 and the post-cast concrete structure 2; the formwork 3 is provided with a pre-cast formwork and a post-cast formwork corresponding to the pre-cast concrete structure 1 and the post-cast concrete structure 2; the induction strip 4 is set in the gap between the pre-cast concrete structure 1 and the post-cast concrete structure 2 to form an induced joint at the construction joint position, the induction strip 4 is connected to the formwork 3, and two are symmetrically arranged, and a gap is set between the two induction strips 4; the waterstop 5 is set in the gap between the two induction strips 4, and the two ends are respectively arranged in the pre-cast concrete structure 1 and the post-cast concrete structure 2; after the post-cast concrete structure 2 is formed, the induction strip 4 is pulled out, and the sealing strip 6 is filled in the induced joint.

[0023] The first cast concrete structure 1 and the second cast concrete structure 2 are both plain concrete structures, and the steel bars of the two are disconnected at the construction joint.

[0024] The first cast formwork forms a casting cavity for casting and shaping the first cast concrete structure 1 ; the second cast formwork and the first cast concrete structure 1 together form a casting cavity for casting and shaping the second cast concrete structure 2 .

[0025] The guide strip 4 runs vertically throughout its entire length and comprises a stopper 41 and an insertion portion 42. The stopper 41 and insertion portion 42 are arranged in a cross-section, with both ends of the stopper 41 secured to the formwork 3 with self-tapping screws. The inner end of the insertion portion 42 is positioned within the gap between the pre-cast concrete structure 1 and the post-cast concrete structure 2, and its cross-sectional width gradually narrows toward the inner end, facilitating the smooth removal of the guide strip 4 after the post-cast concrete structure 2 is formed. The outer end of the insertion portion 42 is provided with through-holes spaced from top to bottom to facilitate hand-held operation by construction personnel.

[0026] The plane of the waterstop 5 is perpendicular to the plane of the insertion portion 42. The waterstop 5 comprises a main body, a telescopic portion, and corrugations. The telescopic portion is located in the middle of the main body and is hollow, contacting the two insertion portions 42. Corrugations are spaced apart on either side of the telescopic portion. The waterstop 5 expands in contact with water.

[0027] The sealing strip 6 fully fills the induced joint and consists of a sealant section and a waterproof putty section, from the inside out. The outer end of the waterproof putty section is exposed and its color matches the concrete structure. The combination of the sealant and waterproof putty sections reduces the depth of the waterproof putty, preventing cracking caused by excessive depth.

[0028] During construction, first assemble the pre-cast formwork, install the waterstop 5, fix it to the pre-cast formwork, and set the additional formwork 3 on the outside of the pre-cast formwork corresponding to the waterstop 5. The additional formwork 3 includes glass glue and a limit plate. The limit plate is fixedly connected to the pre-cast formwork. The glass glue is set between the limit plates and corresponds to the waterstop 5. The waterstop 5 passes through the glass glue to avoid water leakage from the waterstop 5 during the pouring process; then cast the pre-cast concrete structure 1, remove the accessory formwork 3 and the corresponding end pre-cast formwork after forming, assemble the post-cast formwork, install the induction strip 4, and fix it to the formwork 3; then cast the post-cast concrete structure 2, remove the induction strip 4 and the formwork 3 in turn after forming, and construct the sealing strip 6.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction joint and induced joint combined structure for a plain concrete structure, characterized by: The invention comprises a pre-cast concrete structure (1), a post-cast concrete structure (2), a formwork (3), an induction strip (4) and a water stop (5); a gap is provided between the pre-cast concrete structure (1) and the post-cast concrete structure (2); the formwork (3) is provided with a pre-cast formwork and a post-cast formwork corresponding to the pre-cast concrete structure (1) and the post-cast concrete structure (2); the induction strip (4) is provided in the gap between the pre-cast concrete structure (1) and the post-cast concrete structure (2), forming an induction joint at the construction joint position; the induction strip (4) is connected to the formwork (3), and two induction strips (4) are provided symmetrically, with a gap provided between the two induction strips (4); the water stop (5) is provided in the gap between the two induction strips (4), and the two ends are provided in the pre-cast concrete structure (1) and the post-cast concrete structure (2) respectively.

2. A construction joint and induced joint combined structure for a plain concrete structure according to claim 1, characterized in that: It also includes a blocking strip (6), which is arranged in the induction seam after the induction strip (4) is removed.

3. A construction joint and induced joint combined structure for a plain concrete structure according to claim 2, characterized in that: The sealing strip (6) comprises a sealing glue section and a waterproof putty section from the inside to the outside.

4. A construction joint and induced joint combined structure for a plain concrete structure according to claim 1, characterized in that: The induction strip (4) is arranged vertically throughout the entire length and comprises a limiting portion (41) and an inserting portion (42); the limiting portion (41) and the inserting portion (42) are arranged in a cross-like manner; the limiting portion (41) is fixed on the formwork (3); and the inner end of the inserting portion (42) is arranged in the gap between the first-cast concrete structure (1) and the second-cast concrete structure (2).

5. A construction joint and induced joint combined structure for a plain concrete structure according to claim 4, characterized in that: The cross-sectional width of the insertion portion (42) gradually narrows in a direction approaching the inner end, and through holes are provided at intervals from top to bottom at the outer end.

6. A construction joint and induced joint combined structure for a plain concrete structure according to claim 4, characterized in that: The water stop (5) comprises a main body, a telescopic portion and a corrugation; the telescopic portion is arranged in the middle of the main body, has a hollow structure, and contacts the two insertion portions (42); the corrugations are arranged on the main body at both sides of the telescopic portion at intervals.

7. The construction joint and induced joint combined structure for a plain concrete structure according to claim 1, characterized in that: An additional template (3) is provided outside the first cast template, the additional template (3) comprising glass glue and a limiting plate, the limiting plate being fixedly connected to the first cast template; the glass glue is provided between the limiting plates; the water stop (5) passes through the glass glue.

Images