A high-precision installation method and auxiliary system for cast-in-place immersed pipe end steel shell

Abstract

The present invention relates to the field of building construction technology, and specifically to a high-precision installation method and auxiliary system for the end steel shell of a cast-in-place immersed tube. By adding a steel support auxiliary system, the end steel shell is divided into two parts and assembled and then hoisted as a whole. Then, the end steel shell is installed in place in combination with a jacking process, so that the installation accuracy of the end steel shell meets the design requirements. The present invention adopts a steel support system in conjunction with a jacking process to accurately install the end steel shell. At the same time, the end steel shell is assembled and welded twice and then installed as a whole. Under the premise of meeting the design accuracy requirements, the process has high operability and safety, low cost investment, and high construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a high-precision installation method for a cast-in-place immersed pipe end steel shell and an auxiliary system. Background Art

[0002] The background project is the buried section and open section structure of the north bank. The south end of the Z13 section is used as the docking end of the cast-in-place immersed tube and the prefabricated immersed tube. An end steel shell structure is set at the docking point. The end steel shell embedded parts are circumferential steel members. The horizontal length of the structure is 33.4m and the height is 9.7m. Its cross-section is "H" shaped, mainly including flange plates and web plates on both sides. Transverse partitions are arranged at intervals between the web plates. The inner flange plates are provided with reserved sleeves and grouting holes, etc. Waterstop steel sheets, stiffening plates, connecting sleeves and anchor bars are arranged on the inside of the structure. The structure is processed in sections, each section is about 6m long, and the traditional construction process is to install the sections from bottom to top in sequence, which has low construction efficiency and long construction period. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision installation method and auxiliary system for the end steel shell of a cast-in-place immersed tube, which can improve the construction efficiency and reduce the construction period under the premise of ensuring high-precision installation of the end steel shell.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a high-precision installation method for the end steel shell of a cast-in-place immersed tube, characterized in that: by adding a steel support auxiliary system, the end steel shell is assembled in two parts and then hoisted as a whole, and then the end steel shell is installed in place in combination with a top-pushing process, so that the installation accuracy of the end steel shell meets the design requirements, and specifically includes the following steps:

[0005] Construction of embedded parts of steel support auxiliary system

[0006] According to the relevant design drawings, the embedded parts of the steel support auxiliary system are processed, including two sizes of steel plates with round steel. Steel plate 1 is 300mm*300mm*10mm with 6 φ16 round steels with hooks, and steel plate 2 is 800mm*800mm*10mm steel plate with 9 φ16 round steels with hooks, and anchor bars are plug welded;

[0007] During construction, fix the first steel plate to the end surface of the bottom plate foundation cushion layer at a spacing of 1.655m, and fix the second steel plate to the corresponding positions of the top plate and bottom plate end surfaces;

[0008] Steel support auxiliary system processing and assembly

[0009] The steel support auxiliary system includes the steel support bottom plate, steel support side wall and steel support top plate. The steel support bottom plate is a triangular support body formed by welding the vertical pole 1 and the diagonal pole 1. It uses 20# I-beams, with a total of 21 sets. The vertical pole 1 is 2.37m long and the diagonal pole 1 is 2.55m long. The bottom elevation difference between the two parts is 0.53m, and the horizontal spacing at the bottom is 1.3m. The weld at the top junction must be fully welded.

[0010] The steel support side wall is a triangular support body formed by welding two vertical poles and two diagonal poles. Two middle connecting rods are added between the two vertical poles and the two diagonal poles, with a total of 2 sets. The two vertical poles use 400mm*400mm*16mm*16mm box columns with a length of 11.07m. The two diagonal poles use 400mm*400mm*21mm*21mm H-shaped steel with a length of 11.67m. The two middle connecting rods use 300mm*300mm*14mm*16mm H-shaped steel to ensure stable support. The height difference between the bottom of the two vertical poles and the two diagonal poles is 0.535m, and the horizontal spacing is 5.196m.

[0011] The steel support top plate is a triangular support body formed by welding three vertical poles and three diagonal poles. Three middle connecting rods are added between the three vertical poles and the three diagonal poles, with a total of 11 sets. The three vertical poles are made of 200mm*200mm*8mm*12mm H-shaped steel with a length of 11.07m. The three diagonal poles are made of φ299*16mm steel pipes with a length of 11.6m. The three middle connecting rods are made of φ219*12mm steel pipes to ensure stable support. The height difference between the bottom of the three vertical poles and the three diagonal poles is 0.535m, and the horizontal spacing is 5.125m.

[0012] End steel shell bottom plate assembly and top push

[0013] According to the segment processing drawings, assemble the end steel shells in sequence. The initial positioning takes the end 5cm offset to the south as the leading edge to avoid conflict with the main steel bar binding. At the same time, drill holes according to the design drawings on the south side of the mileage to embed the expansion bolts, install the steel plates and tighten them, transport the steel supports to the construction site, hoist and install them, and fully weld the contact surfaces of the embedded parts to ensure that the strength meets the requirements.

[0014] After the assembly and welding of the end steel shell is completed, multiple jacks are transversely fixed between the steel support and the web of the end steel shell, and steel plates are added in the middle to ensure that the jacking distance is within the working range of the jacks; after the jacking begins, multiple construction workers press the jacks at the same time to ensure that the jacking process is continuous and uniform, and the measurement personnel always observe the mileage positions of the end steel shell, and immediately remind to correct if uneven local displacement is found; when the designed mileage is about to be reached, the jacking speed is slowed down until the jacking is in place;

[0015] After the jacking is completed, remove the jack and insert the alignment wooden wedges between the steel support and the end steel shell to ensure that the end steel shell does not move during the concrete pouring;

[0016] Installation of steel shell side wall and top plate steel support auxiliary system

[0017] The installation process of this part of the steel support auxiliary system is the same as that of the bottom plate. It is also hoisted and fully welded with embedded parts. During the process, the end steel shell side wall and top plate are assembled and welded near the construction site.

[0018] The end steel shell side wall and top plate are hoisted, installed and pushed as a whole

[0019] After the inner mold is installed, a 25t tower crane is used to lift the installation end steel shell as a whole to the north side of the steel support auxiliary system, and a jack is also used to push it to the designed mileage.

[0020] The various parts of the steel support auxiliary system are fully connected by carbon dioxide gas shielded welding to ensure the strength of the system.

[0021] An auxiliary system used in a high-precision installation method of a cast-in-place immersed tube end steel shell, characterized in that it includes a steel support auxiliary system and embedded parts of the steel support auxiliary system, wherein the steel support auxiliary system includes a steel support bottom plate portion, a steel support side wall portion and a steel support top plate portion;

[0022] The steel support bottom plate is a triangular support body formed by welding a vertical pole and a diagonal pole. It uses 20# I-beams, a total of 21 sets. The vertical pole is 2.37m long, and the diagonal pole is 2.55m long. The bottom elevation difference between the two parts is 0.53m, and the horizontal spacing at the bottom is 1.3m. The weld at the top junction must be fully welded;

[0023] The steel support side wall is a triangular support body formed by welding two vertical poles and two diagonal poles. Two middle connecting rods are added between the two vertical poles and the two diagonal poles, with a total of 2 sets. The two vertical poles use 400mm*400mm*16mm*16mm box columns with a length of 11.07m. The two diagonal poles use 400mm*400mm*21mm*21mm H-shaped steel with a length of 11.67m. The two middle connecting rods use 300mm*300mm*14mm*16mm H-shaped steel to ensure stable support. The height difference between the bottom of the two vertical poles and the two diagonal poles is 0.535m, and the horizontal spacing is 5.196m.

[0024] The steel support top plate is a triangular support body formed by welding three vertical poles and three diagonal poles. Three middle connecting rods are added between the three vertical poles and the three diagonal poles, with a total of 11 sets. The three vertical poles are made of 200mm*200mm*8mm*12mm H-shaped steel with a length of 11.07m. The three diagonal poles are made of φ299*16mm steel pipes with a length of 11.6m. The three middle connecting rods are made of φ219*12mm steel pipes to ensure stable support. The height difference between the bottom of the three vertical poles and the three diagonal poles is 0.535m, and the horizontal spacing is 5.125m.

[0025] The embedded parts of the steel support auxiliary system include two sizes of steel plates with round steel. Steel plate one is 300mm*300mm*10mm with 6 φ16 round steels with bent hooks, and steel plate two is 800mm*800mm*10mm steel plate with 9 φ16 round steels with bent hooks. The anchor bars are plug welded. Steel plate one is fixed to the end face of the cushion layer at a spacing of 1.655m, and steel plate two is fixed to the corresponding positions of the end faces of the top plate and the bottom plate.

[0026] The present invention adopts a steel support system in conjunction with a jacking process to accurately install the end steel shell. At the same time, the end steel shell is assembled and welded twice and then installed as a whole. Under the premise of meeting the design accuracy requirements, the process has high operability and safety, low cost investment and high construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the installation of the steel support base plate of the auxiliary system of the present invention;

[0028] Figure 2 It is a partial cross-sectional view of the top plate and side wall of the present invention;

[0029] Figure 3 This is a schematic diagram of the installation of the steel support top plate of the auxiliary system of the present invention ( Figure 2 (section 2-2 in the middle);

[0030] Figure 4 This is a schematic diagram of the installation of the steel support side wall of the auxiliary system of the present invention ( Figure 2 (section 1-1);

[0031] In the figure: vertical pole 1 1, diagonal pole 1 2, vertical pole 2 3, diagonal pole 2 4, middle connecting rod 2 5, vertical pole 3 6, diagonal pole 3 7, middle connecting rod 3 8, steel plate 1 9, steel plate 2 10, alignment wooden wedge 11. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] An auxiliary system used in a high-precision installation method of a cast-in-place immersed tube end steel shell includes a steel support auxiliary system and embedded parts of the steel support auxiliary system, wherein the steel support auxiliary system includes a steel support bottom plate portion, a steel support side wall portion and a steel support top plate portion;

[0035] like Figure 1The steel support bottom plate is a triangular support body formed by welding the vertical pole 1 and the diagonal pole 2. It uses 20# I-beams, a total of 21 sets. The vertical pole 1 is 2.37m long, and the diagonal pole 2 is 2.55m long. The bottom elevation difference between the two parts is 0.53m, and the horizontal spacing at the bottom is 1.3m. The weld at the top junction must be fully welded;

[0036] like Figure 4 The steel supporting side wall part is a triangular support body formed by welding the vertical pole 23 and the diagonal pole 24. A middle connecting rod 25 is added between the vertical pole 23 and the diagonal pole 24, with a total of 2 sets. The vertical pole 23 adopts a 400mm*400mm*16mm*16mm box column with a length of 11.07m. The diagonal pole 24 adopts a 400mm*400mm*21mm*21mm H-shaped steel with a length of 11.67m. The middle connecting rod 25 adopts a 300mm*300mm*14mm*16mm H-shaped steel to ensure stable support. The height difference between the bottom of the vertical pole 23 and the diagonal pole 24 is 0.535m, and the horizontal spacing is 5.196m.

[0037] like Figure 3 , the steel support top plate part is a triangular support body formed by welding vertical pole 3 6 and diagonal pole 3 7. A middle connecting rod 3 8 is added between vertical pole 3 6 and diagonal pole 3 7, with a total of 11 sets. Vertical pole 3 6 adopts 200mm*200mm*8mm*12mm H-shaped steel with a length of 11.07m. Diagonal pole 3 7 adopts φ299*16mm steel pipe with a length of 11.6m. The middle connecting rod 3 8 adopts φ219*12mm steel pipe to ensure stable support. The height difference between the bottom of vertical pole 3 6 and diagonal pole 3 7 is 0.535m, and the horizontal spacing is 5.125m.

[0038] The embedded parts of the steel support auxiliary system include two sizes of steel plates with round steel. Steel plate 9 is 300mm*300mm*10mm with 6 φ16 round steels with bent hooks, and steel plate 210 is 800mm*800mm*10mm steel plate with 9 φ16 round steels with bent hooks. The anchor bars are plug welded. Steel plate 9 is fixed to the end face of the cushion layer at a spacing of 1.655m, and steel plate 210 is fixed to the corresponding positions of the end faces of the top plate and the bottom plate.

[0039] Example 2

[0040] A method for high-precision installation of the end steel shell of a cast-in-place immersed tube using the auxiliary system described in Example 1, by adding a steel support auxiliary system, the end steel shell is assembled in two parts and then hoisted as a whole, and then the end steel shell is installed in place in combination with a top-pushing process, so that the installation accuracy of the end steel shell meets the design requirements, specifically comprising the following steps:

[0041] Construction of embedded parts of steel support auxiliary system

[0042] According to the relevant design drawings, process the embedded parts of the steel support auxiliary system; during construction, fix the steel plate 1 9 to the end surface of the cushion layer at a spacing of 1.655m, and fix the steel plate 2 10 to the corresponding positions of the end surfaces of the top plate and the bottom plate;

[0043] Steel support auxiliary system processing and assembly

[0044] Process and assemble the steel support auxiliary system according to the solution described in Installation Example 1;

[0045] End steel shell bottom plate assembly and top push

[0046] According to the segment processing drawings, assemble the end steel shells in sequence. The initial positioning takes the end 5cm offset to the south as the leading edge to avoid conflict with the main steel bar binding. At the same time, drill holes according to the design drawings on the south side of the mileage to embed the expansion bolts, install the steel plates and tighten them, transport the steel supports to the construction site, hoist and install them, and fully weld the contact surfaces of the embedded parts to ensure that the strength meets the requirements.

[0047] After the assembly and welding of the end steel shell is completed, multiple jacks are transversely fixed between the steel support and the web of the end steel shell, and steel plates are added in the middle to ensure that the jacking distance is within the working range of the jacks; after the jacking begins, multiple construction workers press the jacks at the same time to ensure that the jacking process is continuous and uniform, and the measurement personnel always observe the mileage positions of the end steel shell, and immediately remind to correct if uneven local displacement is found; when the designed mileage is about to be reached, the jacking speed is slowed down until the jacking is in place;

[0048] After the jacking is completed, the jack is removed and a aligning wooden wedge 11 is inserted between the steel support and the end steel shell to ensure that the end steel shell does not move during the concrete pouring;

[0049] Installation of steel shell side wall and top plate steel support auxiliary system

[0050] The installation process of this part of the steel support auxiliary system is the same as that of the bottom plate. It is also hoisted and fully welded with embedded parts. During the process, the end steel shell side wall and top plate are assembled and welded near the construction site.

[0051] The end steel shell side wall and top plate are hoisted, installed and pushed as a whole

[0052] After the inner mold is installed, a 25t tower crane is used to lift the installation end steel shell as a whole to the north side of the steel support auxiliary system, and a jack is also used to push it to the designed mileage.

[0053] The various parts of the steel support auxiliary system are fully connected by carbon dioxide gas shielded welding to ensure the strength of the system.

Claims

1. A high-precision installation method for cast-in-place immersed pipe end steel shell, characterized in that: By adding a steel support auxiliary system, the end steel shell is divided into two parts and assembled and hoisted as a whole. Then, the end steel shell is installed in place by combining the top-pushing process, so that the installation accuracy of the end steel shell meets the design requirements. Specifically, the following steps are included: Construction of embedded parts of steel support auxiliary system According to the relevant design drawings, the embedded parts of the steel support auxiliary system are processed, including two sizes of steel plates with round steel. Steel plate 1 is 300mm*300mm*10mm with 6 φ16 round steels with hooks, and steel plate 2 is 800mm*800mm*10mm steel plate with 9 φ16 round steels with hooks, and anchor bars are plug welded; During construction, fix the first steel plate to the end surface of the bottom plate foundation cushion layer at a spacing of 1.655m, and fix the second steel plate to the corresponding positions of the top plate and bottom plate end surfaces; Steel support auxiliary system processing and assembly The steel support auxiliary system includes the steel support bottom plate, steel support side wall and steel support top plate. The steel support bottom plate is a triangular support body formed by welding the vertical pole 1 and the diagonal pole 1. It uses 20# I-beams, with a total of 21 sets. The vertical pole 1 is 2.37m long and the diagonal pole 1 is 2.55m long. The bottom elevation difference between the two parts is 0.53m, and the horizontal spacing at the bottom is 1.3m. The weld at the top junction must be fully welded. The steel support side wall is a triangular support body formed by welding two vertical poles and two diagonal poles. Two middle connecting rods are added between the two vertical poles and the two diagonal poles, with a total of 2 sets. The two vertical poles use 400mm*400mm*16mm*16mm box columns with a length of 11.07m. The two diagonal poles use 400mm*400mm*21mm*21mm H-shaped steel with a length of 11.67m. The two middle connecting rods use 300mm*300mm*14mm*16mm H-shaped steel to ensure stable support. The height difference between the bottom of the two vertical poles and the two diagonal poles is 0.535m, and the horizontal spacing is 5.196m. The steel support top plate is a triangular support body formed by welding three vertical poles and three diagonal poles. Three middle connecting rods are added between the three vertical poles and the three diagonal poles, with a total of 11 sets. The three vertical poles are made of 200mm*200mm*8mm*12mm H-shaped steel with a length of 11.07m. The three diagonal poles are made of φ299*16mm steel pipes with a length of 11.6m. The three middle connecting rods are made of φ219*12mm steel pipes to ensure stable support. The height difference between the bottom of the three vertical poles and the three diagonal poles is 0.535m, and the horizontal spacing is 5.125m. End steel shell bottom plate assembly and top push According to the segment processing drawings, assemble the end steel shells in sequence. The initial positioning takes the end 5cm offset to the south as the leading edge to avoid conflict with the main steel bar binding. At the same time, drill holes according to the design drawings on the south side of the mileage to embed the expansion bolts, install the steel plates and tighten them, transport the steel supports to the construction site, hoist and install them, and fully weld the contact surfaces of the embedded parts to ensure that the strength meets the requirements. After the assembly and welding of the end steel shell is completed, multiple jacks are transversely fixed between the steel support and the web of the end steel shell, and steel plates are added in the middle to ensure that the jacking distance is within the working range of the jacks; after the jacking begins, multiple construction workers press the jacks at the same time to ensure that the jacking process is continuous and uniform, and the measurement personnel always observe the mileage positions of the end steel shell, and immediately remind to correct if uneven local displacement is found; when the designed mileage is about to be reached, the jacking speed is slowed down until the jacking is in place; After the jacking is completed, remove the jack and insert the alignment wooden wedges between the steel support and the end steel shell to ensure that the end steel shell does not move during the concrete pouring; Installation of steel support auxiliary system for end steel shell side wall and top plate The installation process of this part of the steel support auxiliary system is the same as that of the bottom plate. It is also hoisted and fully welded with embedded parts. During the process, the end steel shell side wall and top plate are assembled and welded near the construction site. The end steel shell side wall and top plate are hoisted, installed and pushed as a whole After the inner mold is installed, a 25t tower crane is used to lift the installation end steel shell as a whole to the north side of the steel support auxiliary system, and a jack is also used to push it to the designed mileage.

2. A high-precision installation method for cast-in-place immersed pipe end steel shell according to claim 1, characterized in that: The various parts of the steel support auxiliary system are fully connected by carbon dioxide gas shielded welding to ensure the strength of the system.

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