Prefabricated underground continuous wall and production process thereof

Abstract

The present invention discloses a prefabricated underground continuous wall and a construction method thereof, wherein the prefabricated underground continuous wall comprises: a plurality of groups of prefabricated rectangular steel sheet piles, each of which is provided with a plurality of groups of holed steel pipes; a steel pipe connection groove provided on one side of the prefabricated rectangular steel sheet piles; a steel pipe installed on the other side of the prefabricated rectangular steel sheet piles, and the steel pipe and the steel pipe connection groove are correspondingly arranged; a receiving plug is provided on one side of the prefabricated rectangular steel sheet pile located at the steel pipe connection groove, and a receiving bayonet is provided on one side of the prefabricated rectangular steel sheet pile located at the steel pipe, and the receiving plug is adapted to the receiving bayonet. The present invention can be applied to conventional foundation pit support piles, river bank piles, underground pipe gallery support piles, etc., can also serve as the outer wall of an underground structure, has low production and construction costs, can be applied to replace traditional steel piles that cannot be pulled out, replaces existing cast-in-place piles and water-stop curtain processes, and the prefabricated underground continuous wall has a simple manufacturing process, reliable quality, and broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of foundation pit support engineering, and more specifically, relates to a prefabricated underground continuous wall construction process and construction equipment. At the same time, the present invention also relates to a production process of the prefabricated underground continuous wall. Background Art

[0002] The construction of a building's foundation pit typically begins with the completion of the building's pile foundation and the surrounding structures. Afterwards, the pit is excavated for the construction of the underground structure. Currently, there are many different types of surrounding structures for the pit, with bored cast-in-place piles combined with cement-soil mixing piles being the most common method.

[0003] The traditional bored cast-in-place pile arrangement combined with cement soil mixing pile water-stopping has some problems, such as a long construction period, a large amount of mud and debris generated during the construction process, a large space occupied by the retaining structure, and a temporary structure that cannot serve as the exterior wall of the basement structure. After the construction is completed, it is necessary to wait for the pile body strength to reach the design requirements. After the pile body construction is completed, earth excavation construction cannot be carried out immediately, and the construction cost is relatively high.

[0004] Therefore, a retaining system is designed that is convenient to construct, fast in speed, has good water-stopping effect, and can be excavated immediately. It can be applied to a variety of engineering scenarios such as: conventional foundation pit support piles, river bank piles, underground pipeline corridor support piles, etc. It can also serve as the outer wall of the underground structure. After the pile construction is completed, earth excavation can be carried out. It has low cost and is consistent with the current PC policy orientation. It can be used to replace traditional steel piles that cannot be removed, traditional cast-in-place piles plus water-stop curtain systems. Prefabricated retaining piles with simple construction and manufacturing processes and reliable quality are very necessary. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the existing technology and propose a prefabricated underground continuous wall and its construction method, which have the advantages of fast construction speed, earth excavation can be carried out after the pile construction is completed, small land area is occupied, good water-stopping effect, and a wide range of application scenarios.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A prefabricated underground continuous wall, comprising:

[0008] Several groups of prefabricated rectangular steel sheet piles, wherein the upper and lower connection positions of the several groups of prefabricated rectangular steel sheet piles are each provided with several groups of perforated steel pipes;

[0009] A steel pipe connection groove is provided on one side of the prefabricated rectangular steel sheet pile;

[0010] The steel pipe is installed on the other side of the prefabricated rectangular steel sheet pile, and the steel pipe is arranged corresponding to the steel pipe groove. A plurality of small holes are reserved on the wall side of the steel pipe. After the cement slurry is injected inward, the cement slurry will fill the gap between the steel pipe groove and the steel pipes, thereby realizing the sealing and water-stopping between the prefabricated underground continuous walls;

[0011] The prefabricated rectangular steel sheet pile is provided with a receiving block on one side of the steel pipe connection groove, and the prefabricated rectangular steel sheet pile is provided with a receiving bayonet on one side of the steel pipe, and the receiving block and the receiving bayonet are adapted to each other.

[0012] Preferably, the connection position between the upper and lower prefabricated rectangular steel sheet piles is filled with a UHPC high-strength steel fiber concrete layer.

[0013] Preferably, the prefabricated underground continuous wall further comprises:

[0014] A plurality of groups of prestressed tendons are installed on the prefabricated rectangular steel sheet piles, wherein the plurality of groups of prestressed tendons are arranged in an equidistant array;

[0015] The ends of the prestressed tendons in the prefabricated rectangular steel sheet piles are all provided with corresponding snap-on mechanical joints, which are connected by snap-on mechanical joints, and the joint positions are visually automatically welded using a double-station welding six-axis robotic arm.

[0016] Preferably, the prefabricated underground continuous wall further comprises:

[0017] The rivets installed on the plurality of groups of prefabricated rectangular steel sheet piles are provided in a plurality of groups, and the plurality of groups of rivets are linearly and evenly spaced on the prefabricated rectangular steel sheet piles.

[0018] Preferably, the prefabricated rectangular steel sheet piles include:

[0019] Straight prefabricated rectangular steel sheet piles and right-angle prefabricated rectangular steel sheet piles;

[0020] The receiving plug blocks of the plurality of groups of prefabricated rectangular steel sheet piles are matched with the receiving bayonet, and the steel pipe is clamped inside the steel pipe connection groove.

[0021] Preferably, the prefabricated rectangular steel sheet pile is provided with a water stop groove on one side of the steel pipe joint, and the prefabricated rectangular steel sheet pile is provided with an expansion water stop strip on one side of the steel pipe, and the expansion water stop strip is provided corresponding to the water stop groove.

[0022] A construction method for a prefabricated underground continuous wall comprises the following steps:

[0023] S1. The manufacturer produces prefabricated rectangular steel sheet piles according to the design drawings, and completes the prefabricated underground continuous wall at the full-length section and the corner position of the foundation pit;

[0024] S2. Transport prefabricated rectangular steel sheet piles to the construction project site;

[0025] S3. Determine the placement position of prefabricated rectangular steel sheet piles according to the construction drawings;

[0026] S4. Use a pile driver to first press the lower section of prefabricated rectangular steel sheet piles into the soil;

[0027] S5. Carry out the pile hoisting and pile connection work of the upper section, complete the pile connection and continue to press the pile, and complete the pile pressing work of the upper section; weld the upper and lower sections of the pile at the connection

[0028] S6, tensioning the prestressed tendons through the UHPC high-strength steel fiber concrete layer between the upper and lower piles;

[0029] S7, continue to press the piles to complete the pressing work of the upper pile section;

[0030] S8, repeat the above steps to complete the assembly and pile pressing work of the prefabricated rectangular steel sheet piles at adjacent vertical positions;

[0031] S9. Inject cement slurry into the steel pipe to seal and stop water between the piles, completing all processes.

[0032] Preferably, in step S5, dual robot arms are used to perform visual automatic welding during welding.

[0033] Preferably, in step S4, the pile driver is used to first press the lower section of the prefabricated rectangular steel sheet pile into the soil, and the joints of two adjacent piles in the horizontal direction are staggered by 0.5-1.0m.

[0034] Preferably, the pile driving in step S4 and step S7 is performed by using a static pile driver equipped with a dual-welded six-axis robotic arm, a compaction grouting pump, a small mixing barrel truss boom, and a telescopic boom, wherein the telescopic boom is used to complete the hoisting operation, and the truss boom is used in conjunction with the impact grab bucket to extract soil from the hole during the pile driving process, so that the prefabricated underground continuous wall is smoothly pressed into the soil;

[0035] Among them, a compaction grouting pump is used to extract cement slurry from a small mixing barrel and inject it into a steel pipe to achieve sealing and water-stopping of the joints between prefabricated continuous walls.

[0036] The technical effects and advantages of the present invention are as follows: Compared with traditional solid-state products, the prefabricated underground continuous wall provided by the present invention can be applied to conventional foundation pit support piles, river bank piles, underground pipe gallery support piles, etc., and can also serve as the outer wall of underground structures. The production and construction costs are low, and the prefabricated underground continuous wall can be used to replace traditional steel piles that cannot be removed, and to replace existing cast-in-place piles and water-stop curtain processes. At the same time, the prefabricated underground continuous wall has a simple manufacturing process, reliable quality, and broad application prospects.

[0037] The present invention provides a production process for a prefabricated underground continuous wall, which has the advantages of fast construction speed, earth excavation can be carried out after pile construction is completed, small space occupation, and good water-stopping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a horizontal cross-sectional view of a prefabricated rectangular steel sheet pile structure in an embodiment of the present invention;

[0039] Figure 2 This is a horizontal cross-sectional view of the prefabricated underground continuous wall splicing in an embodiment of the present invention;

[0040] Figure 3 This is a horizontal cross-sectional view of the prefabricated underground continuous wall at the corner position in an embodiment of the present invention;

[0041] Figure 4 This is a structural diagram of the prefabricated rectangular steel sheet pile connection position before the pile connection in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of prefabricated rectangular steel sheet piles after connection at the connection position in an embodiment of the present invention;

[0043] Figure 6 This is a vertical cross-sectional view of a prefabricated underground continuous wall spliced ​​in an embodiment of the present invention;

[0044] Figure 7 Schematic diagram of pile driving construction in an embodiment of the present invention.

[0045] In the figure: 1. Prefabricated rectangular steel sheet piles; 2. Perforated steel pipe; 3. Steel pipe joint; 4. Steel pipe; 5. UHPC high-strength steel fiber concrete layer; 6. Prestressed tendons; 7. Rivets; 8. Water stop groove; 9. Expansion water stop; 10. Connecting bayonet; 11. Connecting plug; 12. Snap-on mechanical joint; 13. Welded six-axis robotic arm; 14. Compacting grouting pump; 15. Small mixing barrel. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] The present invention provides Figure 1-5 A prefabricated underground continuous wall comprises several groups of prefabricated rectangular steel sheet piles 1, wherein the upper and lower connection positions of the several groups of prefabricated rectangular steel sheet piles 1 are each provided with several groups of perforated steel pipes 2; the connection positions of the upper and lower prefabricated rectangular steel sheet piles 1 are filled with UHPC high-strength steel fiber concrete layers 5.

[0048] A steel pipe connection groove 3 is provided on one side of the prefabricated rectangular steel sheet pile 1;

[0049] The steel pipe 4 is installed on the other side of the prefabricated rectangular steel sheet pile 1, and the steel pipe 4 is arranged corresponding to the steel pipe groove 3. A plurality of small holes are reserved on the wall side of the steel pipe 4. After the cement slurry is injected inward, the cement slurry will fill the gap between the steel pipe groove 3 and the steel pipe 4, thereby realizing the sealing and water-stopping between the prefabricated underground continuous walls;

[0050] The prefabricated rectangular steel sheet pile 1 is provided with a receiving block 11 on one side of the steel pipe groove 3, and the prefabricated rectangular steel sheet pile 1 is provided with a receiving bayonet 10 on one side of the steel pipe 4, and the receiving block 11 is adapted to the receiving bayonet 10.

[0051] Precast diaphragm walls also include:

[0052] Several groups of prestressed tendons 6 are installed on the prefabricated rectangular steel sheet piles 1, and the several groups of prestressed tendons 6 are arranged in an equidistant array;

[0053] Precast diaphragm walls also include:

[0054] The rivets 7 are installed on a plurality of groups of prefabricated rectangular steel sheet piles 1 . The rivets 7 are provided in a plurality of groups, and the plurality of groups of rivets 7 are linearly and evenly spaced on the prefabricated rectangular steel sheet piles 1 .

[0055] Compared with traditional solid-state products, the above design of the present invention can be applied to conventional foundation pit support piles, river bank piles, underground pipeline corridor support piles, etc., and can also serve as the outer wall of the underground structure. The production and construction costs are low, and it can be used to replace traditional steel piles that cannot be removed. At the same time, the prefabricated underground continuous wall has a simple manufacturing process, reliable quality, and has broad application prospects.

[0056] The prefabricated rectangular steel sheet pile 1 comprises:

[0057] Straight prefabricated rectangular steel sheet piles and right-angle prefabricated rectangular steel sheet piles;

[0058] The receiving plugs 11 of the plurality of groups of prefabricated rectangular steel sheet piles 1 cooperate with the receiving bayonet 10 , and the steel pipe 4 is clamped inside the steel pipe connection groove 3 .

[0059] The prefabricated rectangular steel sheet pile 1 is provided with a water stop groove 8 on one side of the steel pipe joint 3, and the prefabricated rectangular steel sheet pile 1 is provided with an expansion water stop strip 9 on one side of the steel pipe 4, and the expansion water stop strip 9 is provided corresponding to the water stop groove 8.

[0060] The ends of the prestressed tendons 6 in the prefabricated rectangular steel sheet piles 1 are all provided with corresponding snap-on mechanical joints 12, which are connected by snap-on mechanical joints 12, and the joint positions are visually automatically welded using a double-station welding six-axis robot arm 13.

[0061] When implementing:

[0062] Prefabricated rectangular steel sheet piles can be manufactured with a wall thickness of 5-10mm, 2.0m long, 0.6m wide, and 9-12m high, depending on project requirements. The upper and lower sections are vertically connected and secured by welding. The welding process utilizes dual robotic arms for visual automated welding, improving weld quality and speed.

[0063] The prefabricated steel sheet pile 1 can be processed into structures of different sizes and angles according to actual project needs, thereby meeting the requirements of the enclosure construction at the project corner position.

[0064] The diameter of hole 2 is 400 mm, and the center distance between the holes is 600 mm.

[0065] The precast underground continuous wall is connected horizontally using steel pipe joints 3 and steel pipes 4. The steel pipe joints 3 and steel pipes 4 are at the same height as the precast underground continuous wall. The inner diameter of the steel pipe joints is slightly larger than the outer diameter of the steel pipes. The steel pipes 4 are tightly welded to the precast rectangular steel sheet piles 1. When the precast underground continuous walls are connected horizontally, the steel pipes 4 of the newly built precast underground continuous wall are inserted into the joints 3 of the existing precast underground continuous wall to achieve the precast underground continuous wall splicing. The side walls of the steel pipes 4 are provided with evenly distributed grouting holes. After the connection is completed, cement slurry is injected into the steel pipes 4. The slurry flows through the grouting holes into the gap between the two precast underground continuous walls, filling the gap between the piles and achieving a sealed and watertight connection between the piles.

[0066] The pouring position should be within 1 meter of the joint between the upper and lower piles. For projects that need to use the retaining wall as the structural exterior wall to achieve the integration of two walls into one, the prefabricated underground continuous wall can be fully filled.

[0067] The prestressed tendons 6 are evenly arranged and tensioned along the long sides of the prefabricated underground continuous wall inside the poured concrete.

[0068] The rivets 7 are evenly arranged on the side walls of the prefabricated rectangular steel sheet piles within the area where the concrete is present to enhance the integrity of the side walls and the concrete.

[0069] The height of the water stop groove 8 and the expansion water stop strip 9 are the same as that of the prefabricated underground continuous wall, and are respectively arranged on both sides of the prefabricated underground continuous wall. After the prefabricated underground continuous wall is connected horizontally, if water still seeps between the piles, the expansion water stop strip 9 expands in volume when it encounters water and is in close contact with the inner side of the water stop groove 8, thereby achieving a water-stopping effect.

[0070] The receiving bayonet 10 and the receiving plug 11 are respectively located at the two horizontal ends of the prefabricated underground continuous wall. The cement slurry seeped into the steel pipe 4 during the grouting work can fill the gap between the two ports densely, further enhancing the water-stopping effect between the piles.

[0071] This embodiment also provides a construction method of a prefabricated underground continuous wall, comprising the following steps:

[0072] S1. The manufacturer produces prefabricated rectangular steel sheet piles according to the design drawings, and completes the prefabricated underground continuous wall at the full-length section and the corner position of the foundation pit;

[0073] S2. Transport prefabricated rectangular steel sheet piles to the construction project site;

[0074] S3. Determine the placement position of prefabricated rectangular steel sheet piles according to the construction drawings;

[0075] S4. Use a pile driver to first press the lower section of prefabricated rectangular steel sheet piles into the soil;

[0076] In step S4, the pile driver is used to first press the lower section of the prefabricated rectangular steel sheet pile into the soil, with the joints of two adjacent piles in the horizontal direction staggered by 0.5-1.0m.

[0077] S5. Carry out the pile hoisting and pile connection work of the upper section, complete the pile connection and continue to press the pile, and complete the pile pressing work of the upper section; weld the upper and lower sections of the pile at the connection

[0078] S6, tensioning the prestressed tendons through the UHPC high-strength steel fiber concrete layer between the upper and lower piles;

[0079] S7, continue to press the piles to complete the pressing work of the upper pile section;

[0080] S8, repeat the above steps to complete the assembly and pile pressing work of the prefabricated rectangular steel sheet piles at adjacent vertical positions;

[0081] S9. Inject cement slurry into the steel pipe to seal and stop water between the piles, completing all processes.

[0082] Among them, the pile driving described in step S4 and step S7 adopts a static pile driver with a truss boom and a telescopic boom, wherein the telescopic boom is used to complete the lifting operation, and the truss boom is used in conjunction with the impact grab bucket to take soil from the hole during the pile driving process, so that the prefabricated underground continuous wall is smoothly pressed into the soil, and the cement slurry in the small mixing barrel is extracted by a compaction grouting pump and injected into the steel pipe to achieve sealing and water-stopping of the joints between the prefabricated continuous walls.

[0083] The above process has the advantages of fast construction speed, earth excavation can be carried out after the pile construction is completed, small space occupation and good water-stopping effect.

[0084] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a prefabricated underground continuous wall, the prefabricated underground continuous wall comprising: A plurality of groups of prefabricated rectangular steel sheet piles (1), wherein the upper and lower connection positions of the plurality of groups of prefabricated rectangular steel sheet piles (1) are provided with a plurality of groups of holed steel pipes (2); a steel pipe connection groove (3) is provided on one side of the prefabricated rectangular steel sheet piles (1); the prefabricated rectangular steel sheet piles (1) include: a straight prefabricated rectangular steel sheet pile and a right-angle prefabricated rectangular steel sheet pile; the receiving plugs (11) of the plurality of groups of prefabricated rectangular steel sheet piles (1) are matched with the receiving bayonet (10), and the steel pipe (4) is clamped inside the steel pipe connection groove (3); a water stop groove (8) is provided on one side of the prefabricated rectangular steel sheet piles (1) located on the steel pipe connection groove (3), and an expansion water stop strip (9) is provided on one side of the prefabricated rectangular steel sheet piles (1) located on the steel pipe (4), and the expansion water stop strip (9) is provided corresponding to the water stop groove (8); A steel pipe (4) is installed on the other side of the prefabricated rectangular steel sheet pile (1), and the steel pipe (4) is arranged corresponding to the steel pipe connection groove (3). A plurality of small holes are reserved and distributed on the wall side of the steel pipe (4). After cement slurry is injected inwardly, the cement slurry will fill the gap between the steel pipe connection groove (3) and the steel pipe (4), thereby achieving closed water-stopping between the prefabricated underground continuous walls; The prefabricated rectangular steel sheet pile (1) is provided with a receiving plug block (11) on one side of the steel pipe connection groove (3), and the prefabricated rectangular steel sheet pile (1) is provided with a receiving bayonet (10) on one side of the steel pipe (4), and the receiving plug block (11) and the receiving bayonet (10) are adapted to each other; A plurality of groups of prestressed tendons (6) are installed on the prefabricated rectangular steel sheet pile (1), and the plurality of groups of prestressed tendons (6) are arranged in an equidistant array; the ends of the prestressed tendons (6) in the prefabricated rectangular steel sheet pile (1) are provided with corresponding snap-on mechanical joints (12), which are connected by the snap-on mechanical joints (12), and the joint positions are visually automatically welded by a double-station welding six-axis robot arm (13); The rivets (7) are installed on the plurality of groups of prefabricated rectangular steel sheet piles (1), wherein the rivets (7) are provided in a plurality of groups, and the plurality of groups of rivets (7) are linearly and evenly spaced on the prefabricated rectangular steel sheet piles (1); the method is characterized in that it comprises the following steps: S1. The manufacturer produces prefabricated rectangular steel sheet piles according to the design drawings, and completes the prefabricated underground continuous wall at the full-length section and the corner position of the foundation pit; S2. Transport prefabricated rectangular steel sheet piles to the construction project site; S3. Determine the placement position of prefabricated rectangular steel sheet piles according to the construction drawings; S4. Use a pile driver to first press the lower section of prefabricated rectangular steel sheet piles into the soil; S5. Carry out the pile hoisting and pile connection work of the upper section, complete the pile connection and continue to press the pile, and complete the pile pressing work of the upper section; weld the upper and lower sections of the pile at the connection S6, tensioning the prestressed tendons through the UHPC high-strength steel fiber concrete layer between the upper and lower piles; S7, continue to press the piles to complete the pressing work of the upper pile section; S8, repeat the above steps to complete the assembly and pile pressing work of the prefabricated rectangular steel sheet piles at adjacent vertical positions; S9. Inject cement slurry into the steel pipe to seal and stop water between the piles, completing all processes.

2. The construction method of a prefabricated underground continuous wall according to claim 1, characterized in that: In step S5, dual robot arms are used to perform visual automatic welding during welding.

3. The construction method of a prefabricated underground continuous wall according to claim 1, characterized in that: In step S4, the pile driver is used to first press the lower section of the prefabricated rectangular steel sheet pile into the soil, and the joints of two adjacent piles in the horizontal direction are staggered by 0.5-1.0m.

4. The construction method of a prefabricated underground continuous wall according to claim 1, characterized in that: The pile driving in steps S4 and S7 is performed using a static pile driver equipped with two welded six-axis robotic arms, a compaction grouting pump, a small mixing barrel truss boom, and a telescopic boom. The telescopic boom is used to complete the lifting operation, and the truss boom is used in conjunction with the impact grab bucket to extract soil from the hole during the pile driving process, thereby smoothly pressing the prefabricated underground continuous wall into the soil. Among them, a compaction grouting pump is used to extract cement slurry from a small mixing barrel and inject it into a steel pipe to achieve sealing and water-stopping of the joints between prefabricated continuous walls.

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