A foundation u-shaped induced joint connection configuration

Abstract

This utility model relates to the field of building engineering technology, specifically a basic U-shaped induced joint connection structure, including multiple vertical supports and horizontal supports above them, with a narrow concourse formed by pouring concrete around them. A U-shaped induced joint is reserved between adjacent vertical supports on the horizontal supports. Reinforcing steel bars are arranged around the U-shaped induced joint, but these bars do not enter the projection area of ​​the U-shaped induced joint to avoid obstructing crack induction. A central joint, connected to the outside of the concrete, is reserved at the top center of the U-shaped induced joint and filled with asphalt sealant. Through the hierarchical design of the U-shaped induced joint and the central joint, an active stress release system is constructed in the concrete structure. The U-shaped joint guides crack propagation in a directional manner, while the flexible material in the central joint buffers deformation. Combined with a frame-type steel reinforcement layout, this achieves "controllable cracking, stress redistribution, and integrated waterproofing," effectively solving the problems of random cracking and redundant steel reinforcement in ultra-long structures, while balancing durability and economy.

Description

Technical Field

[0001] This utility model mainly relates to the field of building engineering technology, specifically a basic U-shaped induced joint connection structure. Background Technology

[0002] Large public buildings such as airports and stadiums, if they develop wide cracks during construction and use, will seriously affect the structural durability, load-bearing capacity and waterproofing, among other adverse consequences. In order to ensure the crack resistance of ultra-long reinforced concrete beams and slabs under vertical loads, temperature cracks and shrinkage and creep, it is very important to adopt new crack-resistant technologies and study the crack-resistant mechanism.

[0003] Airport concourses, in particular, have large usable spaces and long spans, often featuring ultra-long reinforced concrete beams and slabs. Furthermore, to ensure adequate ceiling height, most beams are designed as flat beams. The factors contributing to tensile stress in ultra-long reinforced concrete flat beams and slabs are numerous and complex, with high combined tensile stresses at mid-span and beam ends, making it difficult to control crack formation using conventional methods. To enhance the durability of the main building structure and extend its service life, necessary anti-cracking techniques for concrete structures are typically implemented during the construction phase.

[0004] Furthermore, when designing seismic-resistant structures according to current standards, the seismic forces on ultra-long span structures are significant. The reinforcement configuration is often controlled by the crack width at the beam ends. This results in the reinforcement strength being utilized at only about one-third under normal conditions, leading to a significant increase in steel consumption. Additionally, the dense reinforcement makes ensuring construction quality difficult, and increases the difficulty of controlling structural costs. Utility Model Content

[0005] The purpose of this invention is to provide a basic U-shaped induced seam connection structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a basic U-shaped induced joint connection structure, comprising multiple vertical support members and a horizontal support member located above them, and a narrow concourse formed by pouring concrete around it. A U-shaped induced joint is reserved between adjacent vertical support members on the horizontal support member. A steel reinforcement group is arranged around the U-shaped induced joint. The steel reinforcement group does not enter the projection area of ​​the U-shaped induced joint to avoid hindering crack induction. A central joint communicating with the outside of the concrete is reserved at the top center of the U-shaped induced joint. The central joint is filled with asphalt sealant.

[0007] Preferably, the depth of the central seam is hf, the thickness of the horizontal support is ha, and the distances from the position of the U-shaped induction seam to the top of the two adjacent vertical supports are hb1 and hb2, respectively, where hf = max(hb1, hb2) + ha.

[0008] Preferably, an EPDM rubber partition layer is provided at the bottom of the central seam where it connects with the U-shaped induction seam.

[0009] Preferably, side molds are provided around the vertical and horizontal support members, a pad layer is poured at the bottom of the side molds, the vertical support members are in contact with the pad layer, a cement mortar surface layer is applied to the inner side of the side molds, and the horizontal support members are in contact with the cement mortar surface layer.

[0010] Furthermore, the steel reinforcement group includes inner steel reinforcement of the support member, bottom steel reinforcement of the induced joint, and bottom steel reinforcement of the support member. The inner steel reinforcement of the support member is located inside the horizontal support member and at the end point of the U-shaped induced joint. The bottom steel reinforcement of the induced joint is located at the bottom of the U-shaped induced joint and does not enter its projection area. The bottom steel reinforcement of the support member is located at the bottom of the horizontal support member.

[0011] Furthermore, a base plate is provided at the bottom of the U-shaped induced joint to form a frame structure around the induced joint. The steel reinforcement group also includes induced joint side reinforcement, which works in conjunction with the structural distribution reinforcement between the cement mortar surface layers on both sides to cooperate with the base plate in bearing the load.

[0012] The vertical support is a column or a foundation, and the horizontal support is a floor slab or a foundation beam.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By coordinating the design of U-shaped induced joints and central joints, a controllable stress release path is established in the concrete structure. The U-shaped joint guides the cracks to develop along a preset trajectory, while the asphalt sealant in the central joint provides a flexible buffer, and the EPDM rubber layer blocks leakage, forming a complete stress adjustment system of "directional cracking - elastic filling - waterproof sealing". This reduces the risk of random cracks caused by temperature deformation and shrinkage creep in ultra-long structures, while maintaining the integrity of the structure and its waterproof performance.

[0014] 2. By optimizing the layout of the steel reinforcement group, the steel reinforcement around the induced joint avoids the cracking area but strengthens the force transmission at the node, so that the structure can give full play to the strength of the steel reinforcement during the normal service stage. This reduces the steel reinforcement redundancy caused by controlling the crack width in traditional seismic design, which reduces the amount of steel used and improves the operability of construction. It is especially suitable for the crack resistance requirements of structures in confined spaces such as flat beams.

[0015] 3. By selectively setting lateral structural reinforcements to form a closed stress ring with the bottom plate, a portion of the stress release efficiency of the induced joint is sacrificed to improve waterproof reliability. This is more suitable for induced cracking in projects with complex hydrological conditions or extremely high durability requirements.

[0016] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0018] In the accompanying drawings of the instruction manual: Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the side mold structure installed in this utility model; Figure label: 1. Vertical support; 2. Horizontal support; 3. U-shaped guide joint; 4. Reinforcing bar assembly; 411. Inner reinforcement of support; 412. Bottom reinforcement of guide joint; 413. Bottom reinforcement of support; 414. Side reinforcement of guide joint; 5. Center joint; 6. Base plate; 7. Side formwork; 8. Subbase; 9. Cement mortar surface layer. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Example 1

[0021] like Figure 1 and Figure 3 As shown, a basic U-shaped induced joint connection structure includes multiple vertical support members 1 and horizontal support members 2 located above them, with a narrow finger corridor formed by pouring concrete around them. The structure is characterized by: a U-shaped induced joint 3 being reserved between adjacent vertical support members 1 on the horizontal support member 2; a steel reinforcement group 4 being arranged around the U-shaped induced joint 3; the steel reinforcement group 4 not entering the projection area of ​​the U-shaped induced joint 3 (i.e., the vertical projection range of the U-shaped induced joint 3 on the plane of the horizontal support member 2) to avoid obstructing crack induction; and a central joint 5 communicating with the outside of the concrete being reserved at the top center of the U-shaped induced joint 3, the central joint 5 being filled with asphalt sealant.

[0022] The depth of the central seam 5 is hf, the thickness of the horizontal support 2 is ha, and the distances from the position of the U-shaped induction seam 3 to the top of the two adjacent vertical supports 1 are hb1 and hb2, respectively, where hf = max(hb1, hb2) + ha. By dynamically selecting the larger value between the characteristic heights hb1 and hb2 of the two adjacent vertical supports 1, the depth hf of the central seam 5 is ensured to meet the deformation requirements under the most unfavorable load conditions.

[0023] An EPDM rubber barrier layer is provided at the bottom of the central seam 5 where it connects with the U-shaped induced seam 3. The EPDM rubber barrier layer only blocks the fluid channel. Its elastic modulus (3-5MPa) is much lower than that of concrete (30GPa). The stress of crack propagation can still be transmitted through the rubber layer to the weakened area (i.e., the solid groove part) of the U-shaped induced seam 3, thus maintaining the crack induction function. Its principle is similar to that of a rubber gasket in a bolted connection, which both seals and does not hinder the transmission of force.

[0024] The vertical support 1 and the horizontal support 2 are surrounded by side molds 7, which are specifically brick formwork. A pad 8 is poured at the bottom of the side mold 7. The surfaces of the side mold 7 and the pad 8 are also coated with an anti-corrosion coating. The vertical support 1 is in contact with the pad 8. The inner surface of the side mold 7 is coated with an M7.5 cement mortar surface layer 9. The horizontal support 2 is in contact with the cement mortar surface layer 9, which facilitates the construction and casting of the structure.

[0025] The vertical support 1 is a foundation, and the horizontal support 2 is a base beam.

[0026] The steel reinforcement group 4 includes an inner steel reinforcement 411, a bottom steel reinforcement 412 for the induced joint, and a bottom steel reinforcement 413 for the support. The inner steel reinforcement 411 is located inside the horizontal support 2 and at the end of the U-shaped induced joint 3. The bottom steel reinforcement 412 is located at the bottom of the U-shaped induced joint 3 and is inserted in a segmented, non-penetrating manner so as not to enter its projection area. The bottom steel reinforcement 413 is located at the bottom of the horizontal support 2.

[0027] The collaborative design of the U-shaped induced joint 3 and the central joint 5 establishes a controllable stress release path in the concrete structure. The U-shaped joint guides the cracks along a predetermined trajectory, while the asphalt sealant within the central joint 5 provides flexible buffering, and the EPDM rubber layer blocks leakage, forming a complete stress adjustment system of "directional cracking - elastic filling - waterproof sealing." This reduces the risk of random cracks caused by temperature deformation and shrinkage creep in ultra-long structures, while maintaining structural integrity and waterproof performance. The layout of the reinforcement group 4 also optimizes material efficiency. The reinforcement around the induced joint avoids the cracking area but strengthens the force transmission at the joints, allowing the structure to fully utilize the strength of the reinforcement during normal use. This reduces the redundancy of reinforcement caused by controlling crack width in traditional seismic design, reducing steel consumption and improving construction operability. It is especially suitable for the crack resistance requirements of structures in confined spaces such as flat beams.

[0028] The implementation process is as follows: S1. The bottom bedding layer 8 is poured, and the sides are made of brick formwork 7. The inner side of the brick formwork is coated with M7.5 cement mortar 9.

[0029] S2. Apply a layer of anti-corrosion coating to the surface of the side mold 7 and the padding layer 8.

[0030] S3. Construct and pour concrete for vertical support 1, horizontal support 2, and steel reinforcement group 4 according to the design. Pour concrete and foundation structure at the same time. Reserve the positions of U-shaped induced joint 3 and center joint 5. Temporarily fill the gaps when pouring concrete.

[0031] S4. Remove the temporary filler from the joint, apply asphalt sealant evenly to the guide joint, compact and fill it to ensure that the filling is dense and the surface is flat. After caulking, polish the surface. After the sealant dries, wipe the surface with a damp sponge to make it smooth. Example 2

[0032] like Figure 2 and Figure 3 As shown, a basic U-shaped induced joint connection structure differs from Embodiment 1. The vertical support 1 is a column, and the horizontal support 2 is a floor slab. A base plate 6 is added to the bottom of the U-shaped induced joint 3, forming a frame structure around the induced joint. The reinforcing bar group 4 also includes newly added induced joint side reinforcing bars 414. These reinforcing bars 414 work in conjunction with the structural distribution bars between the cement mortar surface layers 9 on both sides, cooperating with the base plate 6 to form a closed stress ring. This sacrifices some stress release efficiency of the induced joint to improve waterproofing reliability. Compared to Embodiment 1, this structure is more suitable for induced cracking in projects with complex hydrological conditions or high durability requirements.

[0033] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from its essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A foundation U-shaped induced joint connection structure comprising a plurality of vertical support members (1) and horizontal support members (2) located above them, and a long and narrow finger corridor formed by pouring concrete around them, characterized in that: The horizontal support member (2) is provided with a U-shaped induced joint (3) between the adjacent vertical support members (1). A steel reinforcement group (4) is provided around the U-shaped induced joint (3). The steel reinforcement group (4) does not enter the projection area of ​​the U-shaped induced joint (3) to avoid hindering crack induction. A central joint (5) communicating with the outside of the concrete is reserved at the top center of the U-shaped induced joint (3). The central joint (5) is filled with asphalt paste.

2. A foundation U-shaped induced joint connection configuration according to claim 1, characterized in that: The depth of the central seam (5) is hf, the thickness of the horizontal support (2) is ha, and the distances from the position of the two adjacent vertical supports (1) to the top from the position of the U-shaped induction seam (3) are hb1 and hb2 respectively, hf=max(hb1,hb2)+ha.

3. The basic U-shaped induced seam connection structure according to claim 1, characterized in that: An EPDM rubber partition layer is provided at the bottom of the central seam (5) where it connects with the U-shaped induction seam (3).

4. A foundation U-shaped induced joint connection configuration according to claim 1, characterized in that: The vertical support (1) and the horizontal support (2) are surrounded by side molds (7), and a pad layer (8) is poured at the bottom of the side mold (7). The vertical support (1) is in contact with the pad layer (8), and the inner side of the side mold (7) is covered with a cement mortar surface layer (9). The horizontal support (2) is in contact with the cement mortar surface layer (9).

5. A foundation U-shaped induced joint connection configuration according to claim 4, wherein: The steel reinforcement group (4) includes the inner steel reinforcement (411) of the support member, the bottom steel reinforcement (412) of the induced joint and the bottom steel reinforcement (413) of the support member. The inner steel reinforcement (411) of the support member is located inside the horizontal support member (2) and at the end of the U-shaped induced joint (3). The bottom steel reinforcement (412) of the induced joint is located at the bottom of the U-shaped induced joint (3) and does not enter its projection area. The bottom steel reinforcement (413) of the support member is located at the bottom of the horizontal support member (2).

6. A foundation U-shaped induced joint connection configuration according to claim 5, wherein: The bottom of the U-shaped induced joint (3) is provided with a base plate (6) to form a frame structure around the induced joint. The steel bar group (4) also includes induced joint side steel bars (414). The induced joint side steel bars (414) work together with the structural distribution bars between the cement mortar surface layers (9) on both sides to cooperate with the base plate (6) to bear the force.

7. A foundation U-shaped induced joint connection configuration according to claim 1, wherein: The vertical support (1) is a column or a foundation, and the horizontal support (2) is a floor slab or a foundation beam.

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