Prestressed glue-spliced waterproof and fire-resistant joint structure for underground environment

Abstract

The utility model belongs to the technical field of underground structures, and particularly relates to a prestressed glue-spliced waterproof fire-resistant joint structure for an underground environment, which is used for stably connecting a prefabricated section I and a prefabricated section II between two assembly type components. Comprising a concave-convex tenon type connecting structure arranged between glue splicing surfaces of a prefabricated section I and a prefabricated section II, a rigid adhesive layer arranged between the glue splicing surfaces of the prefabricated section I and the prefabricated section II, and prestressed steel beam hole channels formed in the two sides of the glue splicing surfaces of the prefabricated section I and the prefabricated section II in a penetrating mode. And after the prefabricated section I and the prefabricated section II are in butt joint, the prestressed steel beam hole channel forms a continuous hole channel for allowing the prestressed steel beam to penetrate through. The underground pre-stress fabricated joint is simple in structure, the structural stability, the waterproof performance and the fire resistance of the underground structure fabricated joint can be effectively improved, the construction process is simple, the construction efficiency is high, and the bending resistance, the shearing resistance, the waterproof performance and the splitting resistance and the impervious performance of the joint after the underground pre-stress fabricated structure is spliced can be effectively guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of underground structure technology, and in particular relates to a prestressed glued waterproof and fire-resistant joint structure for underground environments. Background Technology

[0002] The development, construction, and utilization of urban underground space can increase the convenience of residents' lives, effectively alleviate urban congestion, and also boost employment and promote economic growth. Currently, the development and construction of urban underground space in China still mainly relies on cast-in-place concrete structures. On-site concrete pouring has problems such as long construction cycles, environmental pollution, and resource waste. Using prefabricated structures can effectively shorten the construction period and meet the requirements of green and environmentally friendly construction. Prefabricated structures are an inevitable trend in the future development of urban underground space. Several major technical challenges in the construction process of prefabricated underground structures mainly involve the continuous stress, waterproofing, and fire resistance of the overall structure. This invention, by applying epoxy adhesive to the assembly joints and applying prestressing tension, can form a stable and full adhesive layer on the adhesive surface, enabling the two components to form a rigid overall connection and ensuring the shear and bending resistance of the joint structure. At the same time, the prestressed adhesive joint can also provide waterproofing and sealing effects comparable to cast-in-place concrete. In addition, for underground structures such as urban rail transit stations that are designed to meet the 3-hour fire resistance requirement, an ultra-thin fireproof coating that has been tested and is resistant to high temperatures can be applied to the inside of the adhesive joint to protect the epoxy adhesive layer and achieve a better fire resistance effect for the adhesive joint. Utility Model Content

[0003] The purpose of this invention is to provide a prestressed glued waterproof and fire-resistant joint structure for underground environments, in order to solve the problems mentioned in the background.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A prestressed adhesive-bonded waterproof and fire-resistant joint structure for underground environments is used to stably connect prefabricated segments I and II between two prefabricated components. It includes a tenon-and-groove joint structure between the adhesive surfaces of prefabricated segments I and II, a rigid adhesive layer between the adhesive surfaces of prefabricated segments I and II, and prestressed steel strand channels penetrating both sides of the adhesive surfaces of prefabricated segments I and II. When prefabricated segments I and II are joined, the prestressed steel strand channels form continuous channels for inserting prestressed steel strands.

[0006] In the above technical solution, the tenon-and-groove connection structure includes a tenon-type shear key disposed in prefabricated segment I and a tenon-type groove disposed in prefabricated segment II that matches the tenon-type shear key.

[0007] In the above technical solution, the rigid adhesive layer includes an epoxy rigid adhesive layer applied between the glued surfaces of prefabricated segment I and prefabricated segment II.

[0008] In the above technical solution, the prestressed steel strand ducts include prestressed duct I that penetrates through precast segment I and prestressed duct II that penetrates through precast segment II.

[0009] In the above technical solution, the prestressed duct I and prestressed duct II are joined together to form an inclined continuous duct for the prestressed steel strands to pass through.

[0010] In the above technical solution, the prestressed duct I and prestressed duct II are joined together to form a slightly curved continuous duct for the prestressed steel strands to pass through.

[0011] In the above technical solution, the prestressed steel strand is a prestressed steel bar or a prestressed steel rod.

[0012] In the above technical solution, the joint structure also includes a fireproof coating.

[0013] In the above technical solution, the fireproof coating includes an ultra-thin fireproof coating applied to the inner and / or outer sides of the prefabricated segment I, prefabricated segment II and joint structure range.

[0014] In the above technical solution, the fireproof coating includes an ultra-thin fireproof coating applied to the inner side of prefabricated segment I, prefabricated segment II and the joint structure.

[0015] The advantages and positive effects of this utility model are as follows: By setting shear keys, tenons, prestressed steel strand ducts, and prestressed steel strands on the splicing surface, this utility model achieves horizontal and vertical fixation of the upper and lower segments of the prefabricated structure, thereby meeting the shear resistance requirements of the prefabricated components at the splicing nodes of the underground structure. At the same time, by setting a rigid adhesive layer on the splicing surface, the upper and lower segments form a rigid connection under the action of prestressing tension, which also plays a role in waterproof sealing, thereby meeting the water-proof requirements of the prefabricated structure at the glued splicing nodes. By applying an ultra-thin fireproof coating to the inner wall of the structure at the glued splicing surface, the glued splicing nodes achieve the high temperature resistance characteristic, thereby meeting the 3-hour fire resistance limit of the underground structure. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0017] Figure 1This is a schematic diagram of the structure of prefabricated segment I and prefabricated segment II before they are connected in this embodiment;

[0018] Figure 2 This is a schematic diagram of the structure when prefabricated segment I and prefabricated segment II are connected in this embodiment;

[0019] Figure 3 This is a plan view of the splicing surface of the lower segment of the prefabricated structure.

[0020] Figure 4 This is a side view of the splicing surface of the upper segment of the prefabricated structure.

[0021] In the figure: 1-Prestressed steel strand; 2-Precast segment I; 3-Precast segment II; 4-Tonnel shear key; 5-Tonnel groove; 6-Rigid epoxy adhesive layer; 7-Ultra-thin fireproof coating; 8-Prestressed duct I; 9-Prestressed duct II. Detailed Implementation

[0022] First, it should be noted that the specific structure, features, and advantages of this utility model will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the utility model in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features to obtain more other embodiments of this utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The following is a detailed explanation... Figures 1-4 This utility model is hereby introduced. Example

[0024] A prestressed adhesive-bonded waterproof and fire-resistant joint structure for underground environments is used to stably connect prefabricated segments I (upper segment) 2 and prefabricated segments II (lower segment) 3 between two prefabricated components. It includes a tenon-and-mortise joint structure between the adhesive surfaces (connection seams) of prefabricated segments I 2 and II 3, a rigid adhesive layer between the adhesive surfaces of prefabricated segments I 2 and II 3, and prestressed steel strand channels penetrating both sides of the adhesive surfaces of prefabricated segments I 2 and II 3. When the prefabricated segments I 2 and II 3 are joined, the prestressed steel strand channels form continuous channels for inserting prestressed steel strands 1.

[0025] In this embodiment, refer to the appendix. Figure 1-2 A prestressed adhesive-bonded waterproof and fire-resistant joint structure for underground structures can be used at the joint of the side wall of a prefabricated subway station for stable connection of prefabricated segment I and prefabricated segment II, wherein:

[0026] The joint structure includes a tenon-and-groove connection structure between the glued surfaces of prefabricated segment I2 and prefabricated segment II3. The tenon-and-groove connection structure includes a tenon in prefabricated segment I and a tenon in prefabricated segment II.

[0027] The joint structure includes a rigid adhesive layer disposed between prefabricated segment I2 and prefabricated segment II3, which can realize rigid bonding between adjacent segments;

[0028] The joint structure includes prestressed steel strand ducts that pass through both sides of the glued joint surface of precast segment I2 and precast segment II3, penetrating each component. Prestressed steel strands 1 can be inserted into the prestressed steel strand ducts on precast segment I2 and precast segment II3 for connecting each assembled precast segment.

[0029] Furthermore, in this embodiment, the tenon-and-groove connection structure includes a tenon-type shear key 4 disposed in prefabricated segment I 2 and a tenon-type groove 5 disposed in prefabricated segment II 3 that matches the tenon-type shear key 4. The tenon-type shear key 4 is provided at the glued joint of prefabricated segment I as a shear key, and the tenon-type groove 5 is provided at the glued joint of prefabricated segment II as a tenon. Together with the tenon-type shear key 4 at the glued joint of prefabricated segment I, they restrict the horizontal displacement of the assembled components and resist shear forces. Taking this embodiment as an example, the splicing surface of prefabricated segment I and prefabricated segment II is "W"-shaped due to the tenon-and-groove connection, which restricts the differential horizontal displacement of the assembled components.

[0030] Furthermore, in this embodiment, the rigid adhesive layer may include an epoxy adhesive rigid adhesive layer 6 applied between the adhesive surfaces of precast segment I2 and precast segment II3. This epoxy adhesive layer can stably transfer the tensile and compressive stress at the concrete joint of the upper and lower precast segments and achieve a tensile and compressive strength not lower than that of the adjacent precast concrete component. The epoxy adhesive layer 6 can also achieve the seepage prevention and waterproofing effect required for the self-waterproofing of underground structures.

[0031] Furthermore, in this embodiment, the prestressed steel strand ducts may include prestressed duct I8 penetrating through precast segment I2 and prestressed duct II9 penetrating through precast segment II3.

[0032] Furthermore, in this embodiment, the prestressed duct I8 and prestressed duct II9 can be joined together to form an inclined continuous duct for the prestressed steel strand 1 to pass through.

[0033] Furthermore, in this embodiment, the prestressed duct I8 and prestressed duct II9 can be joined together to form a slightly curved continuous duct for the prestressed steel strand 1 to pass through.

[0034] Furthermore, in this embodiment, the prestressed steel strand 1 can be a prestressed steel bar or a prestressed steel rod. The prestressed steel bar or prestressed steel rod passes through the reserved prestressed ducts I8 and II9 to penetrate the upper and lower precast components, applying tension force to strengthen the joint structure connection.

[0035] Furthermore, in this embodiment, the joint structure may also include a fire-retardant coating applied to the prefabricated sidewall segments, which enhances the fire resistance and high-temperature performance of the joint structure.

[0036] Furthermore, in this embodiment, the fire-retardant coating may include an ultra-thin fire-retardant coating 7 applied to the inner and / or outer sides of the prefabricated segment I2, prefabricated segment II3, and joint structure.

[0037] Furthermore, in this embodiment, the fireproof coating may include an ultra-thin fireproof coating 7 applied to the inner side of the prefabricated segment I2, prefabricated segment II3, and the joint structure. The ultra-thin fireproof coating 7, which is fire-resistant and high-temperature resistant, is applied to the inner side of the prefabricated segment I2, prefabricated segment II3, and the joint, which can protect the epoxy adhesive rigid adhesive layer 6 and achieve better fire resistance of the adhesive joint.

[0038] The working principle of this embodiment is as follows: In use, for prefabricated subway station structures, the prefabricated structural base plate components containing prefabricated segment II3 are hoisted into the groove and fixed. A 2-3mm epoxy adhesive layer 6 is applied to the assembly surface of prefabricated segment II3. Then, the prefabricated components containing prefabricated segment I2 are hoisted into the groove. The prestressed steel strands 1 are passed through the reserved prestressed ducts I8 and II9 and tensioned. The epoxy adhesive between the upper and lower segments is squeezed by the pre-tension force to form a full adhesive layer of about 0.1mm thickness. After curing at room temperature, an integral rigid connection is formed between the two components. Then, an ultra-thin protective coating is applied to one side of the inner surface of the glued joint structure to complete the construction of the fireproof prestressed glued prefabricated joint of the underground structure.

[0039] This embodiment provides a prestressed adhesive-bonded waterproof and fire-resistant joint structure for underground environments. The structure is novel and operates stably, comprising precast segment I, precast segment II, tenon and mortise shear keys, prestressed tendon ducts, prestressed steel strands, joint adhesive layer, and fire-resistant inner coating. The joint between the upper and lower segments resists shear force through tenon and mortise shear keys. The prestressed tendon ducts, prestressed steel strands, and joint adhesive layer achieve continuous bonding and fixation of adjacent precast components. The adhesive joint and fire-resistant inner coating achieve the waterproof and fire-resistant joint performance required for underground structures.

[0040] In summary, this utility model provides a prestressed adhesive-bonded waterproof and fire-resistant joint structure. By pre-applying epoxy adhesive to the joint and then completing the splicing through prestressing tension, excess epoxy adhesive overflows under pressure during tensioning, forming a full adhesive layer between the prefabricated components. This achieves a rigid connection between the two components while simultaneously providing a sealing and waterproofing effect. Finally, an ultra-thin fire-retardant coating is applied to the outside of the adhesive joint to enhance its fire resistance and high-temperature resistance. This utility model has a simple structure, effectively increasing the structural stability and waterproof and fire-resistant properties of prefabricated joints in underground structures. The construction process is simple and efficient, effectively ensuring the bending resistance, shear resistance, waterproofing, and post-fire resistance and impermeability of the joints in the prestressed prefabricated underground structure after splicing.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention 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 invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This method of description is merely for clarity, and those skilled in the art should consider the specification as a whole. The technical solutions in the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A prestressed glued waterproof and fire-resistant joint structure for underground environments, used to stably connect prefabricated segment I (2) and prefabricated segment II (3) between two prefabricated components, characterized in that: It includes a tenon-and-groove joint structure between the glued surfaces of prefabricated segment I (2) and prefabricated segment II (3), a rigid adhesive layer between the glued surfaces of prefabricated segment I (2) and prefabricated segment II (3), and prestressed steel strand channels that pass through both sides of the glued surfaces of prefabricated segment I (2) and prefabricated segment II (3). When the prefabricated segment I (2) and prefabricated segment II (3) are joined, the prestressed steel strand channels form continuous channels for inserting prestressed steel strands (1).

2. The prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 1, characterized in that: The mortise and tenon joint structure includes a tenon shear key (4) in the prefabricated segment I (2) and a tenon groove (5) in the prefabricated segment II (3) that matches the tenon shear key (4).

3. The prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 1, characterized in that: The rigid adhesive layer includes an epoxy rigid adhesive layer (6) applied between the glued surfaces of prefabricated segment I (2) and prefabricated segment II (3).

4. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 1, characterized in that: The prestressed steel strand ducts include prestressed duct I (8) which is installed through the precast segment I (2) and prestressed duct II (9) which is installed through the precast segment II (3).

5. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 4, characterized in that: The prestressed duct I (8) and prestressed duct II (9) are joined together to form an inclined continuous duct for the prestressed steel strand (1) to pass through.

6. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 4, characterized in that: The prestressed duct I (8) and prestressed duct II (9) are joined together to form a slightly curved continuous duct for the prestressed steel strand (1) to pass through.

7. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 1, characterized in that: The prestressed steel strand (1) is a prestressed steel bar or a prestressed steel rod.

8. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 1, characterized in that: The joint structure also includes a fire-retardant coating.

9. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 8, characterized in that: The fireproof coating includes an ultra-thin fireproof coating (7) applied to the inner and / or outer sides of the prefabricated segment I (2), prefabricated segment II (3) and joint structure range.

10. A prestressed glued waterproof and fire-resistant joint structure for underground environments according to claim 8, characterized in that: The fireproof coating includes an ultra-thin fireproof coating (7) applied to the inside of the prefabricated segment I (2), prefabricated segment II (3) and joint structure.

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