Permanent and temporary combined prefabricated underground structure
By using ultra-high performance precast concrete wall units and water-stopping caulking structures in precast underground continuous walls, the problem of water leakage at splicing joints was solved, achieving a high level of waterproofing performance improvement and a shorter construction cycle.
Patent Information
- Application Number
- CN202520539777.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Precast diaphragm walls are prone to water leakage and seepage at the joints formed during the splicing process, while cast-in-place diaphragm walls are difficult to control in terms of quality due to the limitations of the construction environment.
The project adopts a prefabricated underground structure that combines permanent and temporary structures. It uses prefabricated ultra-high performance concrete walls and enhances waterproofing performance through water-stopping caulking and connectors at the joints. The connectors include a combination of male and female parts. The joints are designed as flat joints or tongue-and-groove joints. The water-stopping caulking uses ultra-high performance concrete and longitudinal steel reinforcement.
It effectively improved the waterproof performance of underground structures, shortened the construction period, reduced project costs, and increased the utilization rate of the internal space of the foundation pit.
Smart Images
Figure CN223937204U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of underground structure technology, specifically relating to a prefabricated underground structure that combines permanent and temporary structures. Background Technology
[0002] In underground structures, diaphragm walls are often required. The construction methods for diaphragm walls are generally divided into cast-in-place diaphragm walls and precast diaphragm walls. Cast-in-place diaphragm walls are easily constrained by the underground construction environment, and the quality is difficult to control. Therefore, in actual construction scenarios, precast diaphragm walls are more commonly used. However, during the splicing process, splice joints are formed in precast diaphragm walls. These splice joints are weak points in the waterproofing of precast diaphragm walls and are very prone to leakage and seepage.
[0003] Therefore, it is necessary to provide a prefabricated underground structure that combines permanent and temporary structures to solve the problems mentioned in the background art. Utility Model Content
[0004] This utility model provides a prefabricated underground structure that combines permanent and temporary structures, which can effectively improve the waterproof performance of underground structures.
[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:
[0006] A prefabricated underground structure combining permanent and temporary structures includes:
[0007] Precast wall unit;
[0008] The splice joint structure includes a first connecting end and a second connecting end formed by the ends of two precast wall units extending towards each other, and at least one set of connectors connecting the first connecting end and the second connecting end. The first connecting end and the second connecting end abut against each other to form a splice joint, and the side of the splice joint closest to the outdoor space is sealed with a water-stop caulking sealant.
[0009] Each set of connectors includes a male and a female component that mate with each other. Both the male and female components include a fixed end and a connecting end. The fixed end of the male component is embedded in the first connecting end, and the fixed end of the female component is embedded in the second connecting end. The connecting ends of the male component and the connecting ends of the female component are fixed in correspondence.
[0010] As an improvement, the precast wall unit is precast using ultra-high performance concrete.
[0011] As an improvement, the joint between the first connecting end and the second connecting end is a flat joint. Both the first connecting end and the second connecting end have one side flush with the side corresponding to the main body of the underground structure, and the other side is spaced apart from the side corresponding to the main body of the underground structure to form a groove. The grooves of the first connecting end and the second connecting end are interconnected to form the filling space of the water-stop caulking joint.
[0012] As an improvement, the first connecting end is recessed in the direction away from the splice joint to form a first receiving groove, and the second connecting end is recessed in the direction away from the splice joint to form a second receiving groove. The first receiving groove and the second receiving groove are connected to form a casting space, in which ordinary concrete is poured. A waterstop plate is arranged on the side of the water-stopping joint away from the outdoor space, and the waterstop plate completely covers the splice joint.
[0013] As an improvement, the first receiving groove divides the first connecting end into a first protrusion and a second protrusion, and the second receiving groove divides the second connecting end into a third protrusion and a fourth protrusion. The first protrusion and the third protrusion abut against each other, and the second protrusion and the fourth protrusion abut against each other. The thickness of the first protrusion is less than the thickness of the third protrusion, and the thickness of the second protrusion is less than the thickness of the fourth protrusion. The connector is provided in two sets, one set for connecting the first protrusion and the third protrusion, and the other set for connecting the second protrusion and the fourth protrusion.
[0014] As an improvement, the male component has an L-shaped structure, including a first side and a second side that are perpendicular to each other. The first side is fixed to the side of the first protrusion / second protrusion facing the first receiving groove, and the second side is fixed to the side of the first side away from the splice seam, and the second side is spaced apart from the first protrusion / second protrusion. The female component has a U-shaped structure, including a third side, a fourth side, and a fifth side connected in sequence. The third side is fixed to the left end face of the third protrusion / fourth protrusion, the fifth side is parallel and spaced apart from the third side, the fourth side connects the third side and the fifth side, and the end of the fifth side away from the fourth side is spaced apart from the third protrusion / fourth protrusion. When the male component and the female component are assembled, the second side of the male component is inserted between the third side and the fifth side of the female component to form a limit.
[0015] As an improvement, the splice seam formed by the first connecting end and the second connecting end is a tongue and groove joint. The female component is a C-type connector, and the male component is a matching T-type connector. The C-type connector is embedded in the first connecting end, and the T-type connector is embedded in the second connecting end. The T-type connector is inserted into the receiving groove formed by the C-type connector. The connection gap between the C-type connector and the T-type connector is filled with ultra-high performance concrete. Waterstop strips are also provided on both sides of the assembly position of the C-type connector and the T-type connector, and the waterstop strips completely cover the splice seam.
[0016] As an improvement, the water-stop caulking joint is made of ultra-high performance concrete with a trapezoidal cross-section. The top edge of the trapezoid faces the outdoor space and is flush with the side of the underground structure. The water-stop caulking joint is equipped with longitudinal steel bars, which, together with the hardened ultra-high performance concrete, form a reinforced concrete structure.
[0017] The beneficial effects of this utility model are as follows:
[0018] (1) The main structure of the splice joint is made of ultra-high performance concrete prefabricated. The prefabrication method can greatly shorten the construction period of the underground continuous wall.
[0019] (2) Ultra-high performance concrete has good waterproof performance. At the same time, the joint between the two precast wall units is filled with ultra-high performance concrete to form a water-stop caulking joint, which can further improve the waterproof performance.
[0020] (3) The ultra-high performance concrete underground continuous wall can be used as a permanent and temporary combined structure. When it directly serves as the side wall of the main structure, it can save engineering costs and improve the utilization rate of the internal space of the foundation pit. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0022] Figure 1 This is a structural diagram of a prefabricated underground structure combining permanent and temporary structures provided in Example 1;
[0023] Figure 2 express Figure 1 The diagram shows the structural design of the splicing seam.
[0024] Figure 3 express Figure 1The diagram shows the structure of a precast wall unit.
[0025] Figure 4 express Figure 1 The diagram shows the connection between two adjacent precast wall units.
[0026] Figure 5 This is a schematic diagram of the splicing joint structure in a prefabricated underground structure combining permanent and temporary structures, as provided in Example 2. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.
[0028] Example 1
[0029] Please refer to the following: Figures 1-4 This embodiment provides a prefabricated underground structure that combines permanent and temporary structures, including prefabricated wall units 11 and splicing joint structures 13.
[0030] The precast wall unit 11 is precast using ultra-high performance concrete. In this embodiment, the precast wall unit 11 is a hollow wall with multiple hollow chambers 12 arranged side by side inside, each hollow chamber 12 completely penetrating the precast wall unit 11 from top to bottom. Compared to traditional solid wall structures, the hollow wall structure can significantly reduce its self-weight, thereby reducing transportation and installation costs and construction costs. In addition, the hollow ultra-high performance concrete structure also endows the precast wall unit with good flexural load-bearing capacity and durability.
[0031] The splice joint structure 13 includes a first connecting end 131A and a second connecting end 131B formed by the ends of two precast wall units 11 extending towards each other, and at least one set of connectors 132 connecting the first connecting end 131A and the second connecting end 131B. The first connecting end 131A and the second connecting end 131B abut to form a splice joint 14. The side of the splice joint 14 closest to the outdoor space is sealed with a water-stop caulking 15, which completely covers the opening of the splice joint 14, thus achieving a waterproof effect.
[0032] The joint between the first connecting end 131A and the second connecting end 131B is a flat joint. Both the first connecting end 131A and the second connecting end 131B have one side flush with the side corresponding to the precast wall unit 11, and the other side is spaced apart from the side corresponding to the precast wall unit 11 to form a groove. The grooves of the first connecting end 131A and the second connecting end 131B are interconnected to form the filling space of the water-stop caulking joint 15.
[0033] The first connecting end 131A is recessed in a direction away from the splice joint 14 to form a first receiving groove, and the second connecting end 131B is recessed in a direction away from the splice joint 14 to form a second receiving groove. The first receiving groove and the second receiving groove are connected to form a casting space, in which ordinary concrete 16 is poured. After the ordinary concrete 16 hardens, it forms a good connection effect between two adjacent precast wall units 11. At the same time, after the ordinary concrete 16 hardens, it can also form a good covering effect on the splice joint 14, improving the waterproof performance.
[0034] The first receiving groove divides the first connecting end 131A into a first protrusion 1311 and a second protrusion 1312, and the second receiving groove divides the second connecting end 131B into a third protrusion 1313 and a fourth protrusion 1314. The first protrusion 1311 and the third protrusion 1313 abut against each other, and the second protrusion 1312 and the fourth protrusion 1314 abut against each other. The connector 132 is provided in two sets, one set for connecting the first protrusion 1311 and the third protrusion 1313, and the other set for connecting the second protrusion 1312 and the fourth protrusion 1314.
[0035] Each set of connectors 132 includes a male component 1321 and a female component 1322 that cooperate with each other. Both the male component 1321 and the female component 1322 include a fixed end and a connecting end. The fixed end of the male component 1321 is embedded in the first connecting end 131A, and the fixed end of the female component 1322 is embedded in the second connecting end 131B. The connecting ends of the male component 1321 and the connecting ends of the female component 1322 are correspondingly fixed and encapsulated in the ordinary concrete 16.
[0036] The male component 1321 has an L-shaped structure, including a first side and a second side that are perpendicular to each other. The first side is fixed to the side of the first protrusion 1311 / second protrusion 1312 facing the first receiving groove, and the second side is fixed to the side of the first side away from the splice seam 14, and the second side is spaced apart from the first protrusion 1311 / second protrusion 1312. The female component 1322 has a U-shaped structure, including a third side, a fourth side and a fifth side connected in sequence. The third side is fixed to the left end face of the third protrusion 1313 / fourth protrusion 1314, the fifth side is parallel and spaced apart from the third side, the fourth side connects the third side and the fifth side, and the end of the fifth side away from the fourth side is spaced apart from the third protrusion 1313 / fourth protrusion 1314. When the male component 1321 and the female component 1322 are assembled, the second side of the male component 1321 is inserted between the third side and the fifth side of the female component 1322 to form a limit.
[0037] The thickness of the first protrusion 1311 is less than the thickness of the third protrusion 1313, and the thickness of the second protrusion 1312 is less than the thickness of the fourth protrusion 1314. The difference in thickness provides space to accommodate the male component 1321 and the female component 1322, ensuring that they are completely encased in the ordinary concrete 16, providing excellent insulation and protection against oxidation. Furthermore, since the male component 1321 and the female component 1322 are located within this thickness difference space and do not need to be placed on the joint 14, the joint can maintain good flatness to reduce gaps and further improve waterproofing performance.
[0038] The precast wall unit 11 and the connector 132 are prefabricated in advance and then transported to the construction site for installation, which can greatly shorten the construction cycle.
[0039] A waterstop plate is arranged on the side of the water-stopping joint 15 away from the outdoor space. The waterstop plate completely covers the splice joint 14, which can further improve the waterproof effect at the splice joint.
[0040] The water-stop caulking joint 15 is cast from ultra-high performance concrete and has a trapezoidal cross-section. The top edge of the trapezoid faces the outdoor space and is flush with the corresponding side of the precast wall unit 11. The cross-sectional design of the water-stop caulking joint 15 allows the ultra-high performance concrete within it to better resist water pressure. The water-stop caulking joint 15 is reinforced with longitudinal steel bars, which, together with the hardened ultra-high performance concrete, form a reinforced concrete structure that can better resist water and soil pressure.
[0041] Example 2
[0042] Please see Figure 5 This embodiment provides a prefabricated underground structure that combines permanent and temporary structures, including prefabricated wall units 21 and splicing joint structures 23.
[0043] In this embodiment, the precast wall unit 21 is a traditional solid wall.
[0044] The splice joint structure 23 includes a first connecting end 231A and a second connecting end 231B formed by the ends of two precast wall units 21 extending towards each other, and at least one set of connectors 232 connecting the first connecting end 231A and the second connecting end 231B. The first connecting end 231A and the second connecting end 231B abut to form a splice joint 24. The side of the splice joint 24 closest to the outdoor space is sealed with a water-stop caulking 25, which completely covers the opening of the splice joint 24, thus achieving a waterproof effect.
[0045] The joint formed by the first connecting end 231A and the second connecting end 231B is a tongue and groove joint. Each set of connecting parts 232 includes a male part 2321 and a female part 2322 that cooperate with each other. Both the male part 2321 and the female part 2322 include a fixed end and a connecting end. The fixed end of the male part 2321 is embedded in the first connecting end 231A, and the fixed end of the female part 2322 is embedded in the second connecting end 231B. The connecting ends of the male part 2321 and the connecting ends of the female part 2322 are correspondingly fixed and encapsulated in the ordinary concrete 26.
[0046] The male component 2321 is a T-type connector, and the female component 2322 is a matching C-type connector. The female component 2322 is fixed to the left end of the underground structure main body 21. The C-type connector is embedded in the first connection end 231A, and the T-type connector is embedded in the second connection end 231B. The T-type connector is inserted into the receiving groove formed by the C-type connector. The connection gap between the C-type connector and the T-type connector is filled with ultra-high performance concrete.
[0047] The connection method of the C-type connector and the T-type connector is simple; they can be inserted directly from top to bottom, reducing construction difficulty. Water-stop strips are also provided on both sides of the assembly position of the C-type connector and the T-type connector, completely covering the joint to further enhance waterproofing performance.
[0048] All other structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.
[0049] The prefabricated underground structure combining temporary and permanent features provided by this utility model serves as both a temporary retaining structure during foundation pit construction and a permanent sidewall structure for the main underground structure. Anchorage ends and other structures can be pre-installed above the ultra-high performance concrete underground continuous wall for connecting temporary supports or permanent structural beams and slabs.
[0050] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.
Claims
1. A prefabricated underground structure combining permanent and temporary structures, characterized in that, include: Precast wall unit; The splice joint structure includes a first connecting end and a second connecting end formed by the ends of two precast wall units extending towards each other, and at least one set of connectors connecting the first connecting end and the second connecting end. The first connecting end and the second connecting end abut against each other to form a splice joint, and the side of the splice joint closest to the outdoor space is sealed with a water-stop caulking sealant. Each set of connectors includes a male and a female component that mate with each other. Both the male and female components include a fixed end and a connecting end. The fixed end of the male component is embedded in the first connecting end, and the fixed end of the female component is embedded in the second connecting end. The connecting ends of the male component and the connecting ends of the female component are fixed in correspondence.
2. The prefabricated underground structure combining permanent and temporary structures according to claim 1, characterized in that, The precast wall units are precast using ultra-high performance concrete.
3. The prefabricated underground structure combining permanent and temporary structures according to claim 2, characterized in that, The joint between the first connecting end and the second connecting end is a flat joint. Both the first connecting end and the second connecting end have one side flush with the side corresponding to the main body of the underground structure, and the other side is spaced apart from the side corresponding to the main body of the underground structure to form a groove. The grooves of the first connecting end and the second connecting end are interconnected to form the filling space of the water-stop caulking joint.
4. The prefabricated underground structure combining permanent and temporary structures according to claim 3, characterized in that, The first connecting end is recessed in the direction away from the splice joint to form a first receiving groove, and the second connecting end is recessed in the direction away from the splice joint to form a second receiving groove. The first receiving groove and the second receiving groove are connected to form a casting space. Ordinary concrete is poured in the casting space. A waterstop plate is arranged on the side of the water-stopping joint away from the outdoor space. The waterstop plate completely covers the splice joint.
5. The prefabricated underground structure combining permanent and temporary structures according to claim 4, characterized in that, The first receiving groove divides the first connecting end into a first protrusion and a second protrusion, and the second receiving groove divides the second connecting end into a third protrusion and a fourth protrusion. The first protrusion and the third protrusion abut against each other, and the second protrusion and the fourth protrusion abut against each other. The thickness of the first protrusion is less than the thickness of the third protrusion, and the thickness of the second protrusion is less than the thickness of the fourth protrusion. The connector is provided in two sets, one set for connecting the first protrusion and the third protrusion, and the other set for connecting the second protrusion and the fourth protrusion.
6. The prefabricated underground structure combining permanent and temporary structures according to claim 5, characterized in that, The male component has an L-shaped structure, including a first side and a second side that are perpendicular to each other. The first side is fixed to the side of the first protrusion / second protrusion facing the first receiving groove, and the second side is fixed to the side of the first side away from the splice seam, and the second side is spaced apart from the first protrusion / second protrusion. The female component has a U-shaped structure, including a third side, a fourth side, and a fifth side connected in sequence. The third side is fixed to the left end face of the third protrusion / fourth protrusion, the fifth side is parallel and spaced apart from the third side, the fourth side connects the third side and the fifth side, and the end of the fifth side away from the fourth side is spaced apart from the third protrusion / fourth protrusion. When the male component and the female component are assembled, the second side of the male component is inserted between the third side and the fifth side of the female component to form a limit.
7. The prefabricated underground structure combining permanent and temporary structures according to claim 2, characterized in that, The splice seam formed by the first connecting end and the second connecting end is a tongue and groove joint. The female part is a C-type connector, and the male part is a matching T-type connector. The C-type connector is embedded in the first connecting end, and the T-type connector is embedded in the second connecting end. The T-type connector is inserted into the receiving groove formed by the C-type connector. The connection gap between the C-type connector and the T-type connector is filled with ultra-high performance concrete. Waterstop strips are also provided on both sides of the assembly position of the C-type connector and the T-type connector, and the waterstop strips completely cover the splice seam.
8. The prefabricated underground structure combining permanent and temporary structures according to claim 1, characterized in that, The water-stop caulking joint is made of ultra-high performance concrete with a trapezoidal cross-section. The top edge of the trapezoid faces the outdoor space and is flush with the side of the underground structure. The water-stop caulking joint is equipped with longitudinal steel bars, which, together with the hardened ultra-high performance concrete, form a reinforced concrete structure.