A node connection between a prefabricated underground continuous wall and a cast-in-place composite wall

Abstract

The utility model discloses a node connection of a prefabricated underground continuous wall and a cast-in-place composite wall, comprising a prefabricated underground continuous wall, the prefabricated underground continuous wall and the cast-in-place underground continuous wall are fixedly connected, a cast-in-place buttress column is cast inside the connection between the prefabricated underground continuous wall and the cast-in-place underground continuous wall, and a cast-in-place structural side wall is cast inside the cast-in-place underground continuous wall and at the side wall of the cast-in-place buttress column. The utility model adopts a cast-in-place underground continuous wall for support in irregular areas of underground engineering, utilizes the flexibility of the cast-in-place structure, avoids the use of all prefabricated components, and avoids the need to purchase multiple sets of special-shaped molds, which causes an increase in engineering costs. It combines cast-in-place with prefabrication according to local conditions, improves the construction efficiency of the underground engineering enclosure structure, speeds up the construction speed of the underground engineering, and optimizes the allocation of labor. The utility model ensures the strength, integrity, durability and waterproof effect of the node connection position during use.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground structure engineering, and in particular relates to a node connection between a prefabricated underground continuous wall and a cast-in-place composite wall. Background Art

[0002] Underground continuous wall is one of the commonly used retaining structures in open excavation foundation pits. After the wall is completed, it has the advantages of high structural rigidity, good integrity, low construction vibration, and low noise. It is usually suitable for underground structural projects with dense urban buildings and complex surrounding environments. At present, underground continuous walls mostly use cast-in-place structures, that is, trench construction first, then hanging steel cages, and finally pouring concrete. The wall construction period is long and the construction site occupies a large area; to a certain extent, it limits the construction efficiency of the retaining structure of underground structural projects.

[0003] With the continuous expansion of my country's urban scale and the rapid development of underground urban rail transit, the scale of underground engineering construction has grown rapidly, the surrounding environment has become more and more complex, the construction site has become increasingly tight, and the construction time has become shorter and shorter, which has put forward higher, faster and better requirements for the construction of foundation pit retaining structures.

[0004] In recent years, prefabricated construction technology has developed rapidly in the field of underground structural engineering. Among them, prefabricated underground continuous walls have developed rapidly with their advantages of factory manufacturing, high component quality and good wall durability. At the same time, components can be mass-produced in advance in professional prefabricated component processing plants according to the actual situation of the project. After the construction conditions are met on site, they will be transported from the factory to the construction site for flow-type installation operations, which greatly improves the construction efficiency of the enclosure structure. It has a relatively broad application prospect and good social and economic benefits.

[0005] Therefore, it is urgent to design a node connection and construction method for prefabricated underground continuous wall and cast-in-place composite wall structure to ensure that in the future design of underground engineering enclosure structures, cast-in-place and prefabrication are combined according to local conditions, and their respective advantages are fully utilized to improve the construction efficiency of underground projects and speed up the construction of underground projects. Summary of the invention

[0006] The utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a node connection between a prefabricated underground continuous wall and a cast-in-place composite wall.

[0007] The technical solution of the utility model is: a node connection of a prefabricated underground continuous wall and a cast-in-place composite wall, comprising a prefabricated underground continuous wall, one side of the prefabricated underground continuous wall along the length direction is fixedly connected to the cast-in-place underground continuous wall, cast-in-place buttress columns are cast on the inner side of the connection between the prefabricated underground continuous wall and the cast-in-place underground continuous wall, and cast-in-place structural side walls are cast on the inner side of the cast-in-place underground continuous wall and the side walls of the cast-in-place buttress columns.

[0008] Furthermore, the cast-in-place underground continuous wall includes a cast-in-place underground continuous wall reinforcement cage and cast-in-place concrete.

[0009] Furthermore, the prefabricated underground continuous wall is provided with tenons along the length direction of the side walls at the node connection, and the steel bars of the cast-in-place underground continuous wall steel cage at the corresponding side wall positions need to be bent and grooves are formed after the concrete is poured, and the tenons and grooves form a socket fit.

[0010] Furthermore, a T-shaped inter-width connector is embedded in the tenon, and a protruding section of the T-shaped inter-width connector is provided with a grouting structure for performing grouting to reinforce the inter-width connection.

[0011] Furthermore, a water-stop structure is provided at the connection between the prefabricated underground continuous wall and the cast-in-place underground continuous wall.

[0012] Furthermore, the cast-in-place underground continuous wall reinforcement cage and the prefabricated underground continuous wall are aligned with the embedded welded angle steels on the inner side of the foundation pit, and the vertical joints between the cast-in-place underground continuous wall and the prefabricated underground continuous wall are closed by the welded angle steels.

[0013] Furthermore, a steel bar connector is arranged inside the prefabricated underground continuous wall, and the buttress column connecting steel bars in the cast-in-place buttress column are connected to the steel bar connector.

[0014] The beneficial effects of the utility model are as follows:

[0015] The prefabricated underground continuous wall in the utility model is produced by a professional prefabricated component processing plant, and most of the structure production is transferred from the construction site to the factory, which can not only reduce the amount of work and the project site of the on-site operation, but also produce components in advance, providing conditions for the subsequent on-site flow-type installation work, which is economical and efficient; at the same time, cast-in-place underground continuous walls are used for support in irregular areas of underground projects, and the flexibility of cast-in-place structures is utilized to avoid the use of all prefabricated components, the need to purchase multiple sets of special-shaped molds, and the increase in engineering costs. According to local conditions, cast-in-place and prefabrication are combined to improve the construction efficiency of underground project enclosure structures, speed up the construction speed of underground projects, and optimize the allocation of labor.

[0016] The utility model solves the waterproof and durability problems of the cast-in-place composite wall structure and the prefabricated underground continuous wall at the node connection position. The prefabricated underground continuous wall is provided with a convex tenon at the connection and a grouting pipe is pre-buried, and the cast-in-place underground continuous wall steel cage is provided with a groove at the connection. During the pouring of the cast-in-place underground continuous wall concrete, the fluidity of the concrete is used to completely wrap the convex tenon of the prefabricated underground continuous wall, and during the pouring of the concrete, the grouting pipe provided at the protruding section of the T-shaped inter-width connector is used to inject high-pressure cement slurry with a delay, so as to ensure that the node connection is filled densely, forming a strong waterproof ability and a strong structural connection.

[0017] The utility model embeds weldable angle steels on the cast-in-place underground continuous wall and the prefabricated underground continuous wall, and simultaneously performs bevel welding during the foundation pit excavation process to further seal the joints and enhance the waterproofing ability of the retaining structure during construction; finally, cast-in-place buttress columns are arranged on the outside of the weldable angle steels, and steel bar connectors connected to the buttress columns are reserved on the prefabricated underground continuous wall to strengthen the connection between the nodes of the main structure and the prefabricated components during the backbuilding stage, thereby ensuring the strength, integrity, durability and waterproofing effect of the node connection positions during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a plan view of the node connection in the utility model;

[0019] Figure 2 It is a connection drawing of the prefabricated underground continuous wall in the utility model;

[0020] Figure 3 This is a large-scale drawing of the connection of the T-shaped width-to-width connector in the utility model;

[0021] Figure 4 It is a connection drawing of the cast-in-place composite wall structure in the utility model;

[0022] Figure 5 It is a connection schematic diagram of the welded angle steel in the utility model;

[0023] in:

[0024] 1 Prefabricated underground continuous wall 2 Cast-in-place underground continuous wall

[0025] 3 Cast-in-place structural side walls 4 Cast-in-place buttress columns

[0026] 5 Cast-in-place underground continuous wall reinforcement cage 6 Tenon

[0027] 7T-shaped web connector 8 notch

[0028] 9Rebar connector 10Welding angle steel

[0029] 11 Grouting pipe 12 End plate

[0030] 13 Anchor bolt 14 Grouting hole

[0031] 15 Anchor steel bar 16 Buttress column connection steel bar

[0032] 17 Bevel welding 18 Open hoop anchor steel bar

[0033] 19 Water-swelling water stop 20 Bolt hole

[0034] 21 groove 22 cavity body. DETAILED DESCRIPTION

[0035] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0036] like Figures 1 to 5 As shown, a node connection of a prefabricated underground continuous wall and a cast-in-place composite wall comprises a prefabricated underground continuous wall 1, one side of the prefabricated underground continuous wall 1 along the length direction is fixedly connected to a cast-in-place underground continuous wall 2, a cast-in-place buttress column 4 is cast on the inner side of the connection between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2, and a cast-in-place structural side wall 3 is cast on the inner side of the cast-in-place underground continuous wall 2 and the side wall of the cast-in-place buttress column 4.

[0037] The cast-in-place underground continuous wall 2 comprises a cast-in-place underground continuous wall reinforcement cage 5 and cast-in-place concrete.

[0038] The prefabricated underground continuous wall 1 is provided with a tenon 6 along the length direction of the side wall at the node connection. The steel bars of the cast-in-place underground continuous wall steel cage 5 at the corresponding side wall position need to be bent and a groove 21 is formed after the concrete is poured. The tenon 6 and the groove 21 form a socket fit.

[0039] A T-shaped inter-width connecting member 7 is pre-embedded in the tenon 6, and a protruding section of the T-shaped inter-width connecting member 7 is provided with a grouting structure for performing grouting for inter-width connection reinforcement.

[0040] A water-stop structure is provided at the connection between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2.

[0041] The cast-in-place underground continuous wall reinforcement cage 5 and the prefabricated underground continuous wall 1 are aligned with the embedded welded angle steel 10 on the inner side of the foundation pit, and the vertical seam between the cast-in-place underground continuous wall and the prefabricated underground continuous wall 1 is closed by the welded angle steel 10 .

[0042] The prefabricated underground continuous wall 1 is provided with a steel bar connector 9 , and the buttress column connecting steel bars 16 in the cast-in-place buttress column 4 are connected to the steel bar connector 9 .

[0043] Specifically, the prefabricated underground continuous wall 1 is a single wall structure, and the cast-in-place underground continuous wall 2, the cast-in-place structural side wall 3, and the cast-in-place buttress columns 4 constitute a cast-in-place composite wall structure.

[0044] Specifically, the prefabricated underground continuous wall 1 is provided with a tenon 6 at the node connection, and a T-shaped inter-width connector 7 is embedded in the tenon 6; and the prefabricated underground continuous wall 1 is provided with a plurality of cavities 22 along the longitudinal direction of the wall at a location where the force in the length direction is relatively small.

[0045] More specifically, the number of the hollow cavities 22 may be, but is not limited to, five.

[0046] Specifically, Figure 3As shown, the grouting structure includes a grouting pipe 11 of the protruding section of the T-shaped inter-width connector 7, the grouting pipe 11 has grouting holes 14 along the annular direction, the grouting holes 14 are arranged in a plum blossom shape, and the grouting pipe 11 is closed at the bottom; on the other side, that is, the tail of the T-shaped inter-width connector 7 is provided with an end plate 12, the end plate 12 has bolt holes 20 along the longitudinal direction, and the T-shaped inter-width connector 7 is firmly installed by anchor bolts 13. The mechanically connected anchoring form is adopted to facilitate the convenient and efficient installation of the anchoring structure of the T-shaped inter-width connector 7.

[0047] More specifically, the grouting pipe 11 and the end plate 12 are both welded and fixed to the connecting plate.

[0048] Specifically, Figure 2 As shown, the prefabricated underground continuous wall 1 has two notches 8 reserved at the node connection, and the notches 8 are located on both sides of the tenon 6. The water-stop structure includes two water-swellable water-stop strips 19, and the water-swellable water-stop strips 19 are arranged in the notches 8.

[0049] Specifically, the prefabricated underground continuous wall 1 is provided with anchoring steel bars 15 , and the anchoring steel bars 15 are connected to the steel bar connectors 9 , and the steel bar connectors 9 are reserved for connection with the cast-in-place buttress columns 4 .

[0050] Specific, combined Figure 2 , Figure 4 The cast-in-place underground continuous wall steel cage 5 and the prefabricated underground continuous wall 1 are aligned with the embedded welded angle steel 10 on the inner side of the foundation pit, and the cast-in-place underground continuous wall steel cage 5 is provided with a groove 21 at the node connection.

[0051] Specifically, a cast-in-place buttress column 4 is arranged outside the welded angle steel 10 , and the surface of the prefabricated underground continuous wall 1 in the area of ​​the cast-in-place buttress column 4 needs to be roughened.

[0052] Specifically, Figures 2 to 4 As shown, the prefabricated underground continuous wall 1 is provided with a convex tenon 6 at the node connection, and a T-shaped inter-width connector 7 is embedded in the convex tenon 6; correspondingly, the cast-in-place underground continuous wall steel cage 5 is provided with a groove 21 at the node connection, and during the pouring of concrete of the cast-in-place underground continuous wall 2, the fluidity of the concrete is used to completely wrap the convex tenon 6 provided on the prefabricated underground continuous wall 1, thereby forming a concave-convex tenon-groove connection between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2; at the same time, during the pouring of concrete of the cast-in-place underground continuous wall 2, the grouting pipe 11 provided at the protruding section of the T-shaped inter-width connector 7 is delayed to inject high-pressure cement slurry to ensure that the concrete at the node connection is densely poured; combined with the roughening treatment of the surface of the prefabricated underground continuous 1 at the node connection and the pasting of two water-expanding waterstop strips in the installation groove 8, a stronger waterproof ability and a stronger structural connection are formed between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2.

[0053] Specifically, Figure 5 As shown, the cast-in-place underground continuous wall steel cage 5 and the prefabricated underground continuous wall 1 are aligned with the embedded weldable angle steel 10 on the inner side of the foundation pit. During the foundation pit excavation stage, the two aligned welded angle steels 10 are subjected to bevel welding 17 from top to bottom as the foundation pit is excavated, so as to close the vertical joint between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2 from the inner side of the foundation pit, thereby further enhancing the waterproof capability of the vertical joint.

[0054] Specifically, Figure 1 , Figure 2 , Figure 4 As shown, cast-in-place buttress columns 4 are arranged on the outside of the welded angle steel 10; and the prefabricated underground continuous wall 1 has two rows of steel bar connectors 9 embedded at the node connection of the cast-in-place buttress columns 4, and the surface of the node connection range is roughened; in the main structure backbuilding stage, the vertical joints between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2 are sealed and reinforced by screwing the buttress column connecting steel bars 16 into the steel bar connectors 9, thereby further enhancing the waterproof ability of the vertical joints and the strength, integrity and durability of the node connections.

[0055] A construction method for connecting nodes of a prefabricated underground continuous wall and a cast-in-place composite wall comprises the following steps:

[0056] A. Prefabrication and processing of prefabricated underground continuous wall 1;

[0057] B. Tie up the cast-in-place underground continuous wall reinforcement cage 5 and install the welded angle steel 10;

[0058] C. Carry out trenching construction of underground continuous wall;

[0059] D. roughening the connection surface of the prefabricated underground continuous wall 1 and pasting a water-swelling water stop strip 19;

[0060] E. Hoisting prefabricated underground continuous wall 1;

[0061] F. Lifting the cast-in-place underground continuous wall steel cage 5, pouring concrete, and completing the construction of the cast-in-place underground continuous wall 2;

[0062] G. Carry out grouting of vertical joints between the widths;

[0063] H. Repeat the above construction to complete the construction of the connection nodes between the remaining prefabricated underground continuous walls and the cast-in-place underground continuous walls, and complete the construction of the remaining enclosure structures to close the foundation pit. After all enclosure structures reach the design strength, the foundation pit is excavated, and the welding construction of the welded angle steel 10 is carried out at the same time;

[0064] I. Casting construction: cast-in-place structure side walls 3 and cast-in-place buttress columns 4.

[0065] Step A prefabricates and processes the prefabricated underground continuous wall 1, and the specific process is as follows:

[0066] First, a detachable, high-precision composite steel mold for the prefabricated underground continuous wall 1 is designed and manufactured;

[0067] Then, the prefabricated underground continuous wall 1 is processed through the designed mold.

[0068] Step B: Tie up the cast-in-place underground continuous wall reinforcement cage 5 and install the welded angle steel 10. The specific process is as follows:

[0069] First, the cast-in-place underground continuous wall steel cage 5 is tied on site, and the steel bars at the corresponding side wall positions at the node connection of the cast-in-place underground continuous wall steel cage 5 need to be bent to form a groove 21;

[0070] Then, a welded angle steel 10 is arranged inside the foundation pit of the cast-in-place underground continuous wall reinforcement cage 5;

[0071] Finally, the welded angle steel 10 is fixed to the cast-in-place underground continuous wall reinforcement cage 5 through the open hoop-shaped anchor reinforcement 18 .

[0072] Specifically, step C is to carry out underground continuous wall trenching construction, and the specific process is as follows:

[0073] Carry out trenching construction of underground continuous wall, including trenching construction of prefabricated underground continuous wall 1 and trenching construction of cast-in-place underground continuous wall 2.

[0074] Specifically, in step D, the surface of the connection of the prefabricated underground continuous wall 1 is roughened and the water-swellable water stop strip 19 is pasted. The specific process is as follows:

[0075] First, the surface where the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2 are connected is roughened;

[0076] Then, a water-swellable waterstop strip 19 is pasted into the reserved notch 8 on the prefabricated underground continuous wall 1 .

[0077] Specifically, step E is to hoist the prefabricated underground continuous wall 1, and the specific process is as follows:

[0078] The prefabricated underground continuous wall 1 is hoisted and after being hoisted into place as required, the prefabricated underground continuous wall 1 is temporarily fixed.

[0079] Specifically, step F is to hang the cast-in-place underground continuous wall steel cage 5, pour concrete, and complete the construction of the cast-in-place underground continuous wall 2. The specific process is as follows:

[0080] The cast-in-place underground continuous wall reinforcement cage 5 is hoisted and placed in place as required, and then the concrete pouring of the cast-in-place underground continuous wall 2 is carried out.

[0081] Specifically, step G performs grouting of vertical joints between the webs, and the specific process is as follows:

[0082] First, a grouting pipe 11 is provided at the protruding section of the T-shaped inter-width connector 7 embedded in the prefabricated underground continuous wall 1;

[0083] Then, high-pressure cement slurry is injected into the vertical joint of the connection through the grouting pipe 11, and the grouting construction is required to lag behind the concrete pouring of the cast-in-place underground continuous wall 2.

[0084] Specifically, step H repeats the above construction to complete the construction of the connection nodes of the remaining prefabricated underground continuous walls and the cast-in-place underground continuous walls, and completes the construction of the remaining enclosure structures to close the foundation pit. After all enclosure structures reach the design strength, the foundation pit is excavated, and the welding construction of the welded angle steel 10 is carried out along with the foundation pit excavation. The specific process is as follows:

[0085] First, according to the foundation pit layout and construction planning, continue to complete the construction of the remaining prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2 connection nodes;

[0086] Then, the remaining retaining structures of the foundation pit are constructed and the foundation pit is closed;

[0087] After that, after all the retaining structures have reached the designed strength, the foundation pit excavation and internal support construction will be carried out;

[0088] Finally, during the excavation of the foundation pit, the welded angle steel 10 at the node connection between the prefabricated underground continuous wall 1 and the cast-in-place underground continuous wall 2 is subjected to groove welding 17 from top to bottom to further close the vertical joint.

[0089] Specifically, step 1 is to cast and construct the cast-in-place structure side wall 3 and the cast-in-place buttress column 4, and the specific process is as follows:

[0090] First, the main structure is constructed by tying the steel bars of the cast-in-place structure side walls 3 and the cast-in-place buttress columns 4;

[0091] Then, the buttress column connecting steel bar 16 is screwed into the steel bar connector 9 at the node connection between the prefabricated underground continuous wall 1 and the cast-in-place buttress column 4;

[0092] Then, the surface of the prefabricated underground continuous wall 1 in the area of ​​the cast-in-place buttress column 4 is roughened synchronously;

[0093] Finally, pour the main structure concrete to complete the node construction of the prefabricated underground continuous wall 1 and the cast-in-place composite wall structure.

[0094] Specifically, during the construction process of step I, the remaining main structures other than the connection nodes of the prefabricated underground continuous wall 1 and the cast-in-place composite wall structure need to be constructed simultaneously to form a complete main structure force system of the underground project.

[0095] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of implementation of the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A node connection between a prefabricated underground continuous wall and a cast-in-place composite wall, comprising a prefabricated underground continuous wall (1), characterized in that: One side of the prefabricated underground continuous wall (1) along the length direction is fixedly connected to the cast-in-place underground continuous wall (2); a cast-in-place buttress column (4) is cast inside the connection between the prefabricated underground continuous wall (1) and the cast-in-place underground continuous wall (2); and a cast-in-place structural side wall (3) is cast inside the cast-in-place underground continuous wall (2) and on the side wall of the cast-in-place buttress column (4).

2. The node connection of a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 1, characterized in that: The cast-in-place underground continuous wall (2) comprises a cast-in-place underground continuous wall reinforcement cage (5) and cast-in-place concrete.

3. The node connection between a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 2, characterized in that: The prefabricated underground continuous wall (1) is provided with a tenon (6) on the side wall at the node connection along the length direction; the steel bars of the cast-in-place underground continuous wall steel cage (5) at the corresponding side wall position need to be bent and a groove (21) is formed after the concrete is poured; the tenon (6) and the groove (21) form a socket-and-spigot fit.

4. The node connection of a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 3, characterized in that: A T-shaped inter-width connecting member (7) is pre-embedded in the tenon (6), and a protruding section of the T-shaped inter-width connecting member (7) is provided with a grouting structure for performing inter-width connection reinforcement grouting.

5. A node connection between a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 1 or 2, characterized in that: A water-stop structure is provided at the connection between the prefabricated underground continuous wall (1) and the cast-in-place underground continuous wall (2).

6. The node connection between a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 2, characterized in that: The cast-in-place underground continuous wall steel cage (5) and the prefabricated underground continuous wall (1) are aligned with the pre-buried welded angle steel (10) on the inner side of the foundation pit, and the vertical joint between the cast-in-place underground continuous wall (2) and the prefabricated underground continuous wall (1) is closed by the welded angle steel (10).

7. The node connection between a prefabricated underground continuous wall and a cast-in-place composite wall according to claim 1, characterized in that: A steel bar connector (9) is arranged inside the prefabricated underground continuous wall (1), and the buttress column connecting steel bars (16) in the cast-in-place buttress column (4) are connected to the steel bar connector (9).

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