An assembled ECC steel plate-concrete composite pipe gallery and its construction method

Abstract

The present invention provides an assembled ECC steel plate-concrete composite pipe corridor and a construction method thereof, relating to the technical field of building construction. The assembly comprises: an ECC steel plate-prefabricated steel cage composite panel suitable for installation at the bottom, an ECC steel plate-concrete composite wall installed on both sides, and a concrete composite panel installed at the top. An ECC steel plate is disposed above the concrete composite panel. The ECC steel plate-prefabricated steel cage composite panel, the ECC steel plate-concrete composite wall, the concrete composite panel, and the ECC steel plate are combined to form a pipe corridor with ECC steel plates. The ECC steel plate-prefabricated steel cage composite panel at the bottom and the concrete composite panel at the top are both connected to the ECC steel plate-concrete composite walls on both sides by anchored bent bars. This solution can improve the strength of the pipe corridor and enhance construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to an assembled outsourced ECC steel plate-concrete composite pipe gallery and a construction method thereof. Background Art

[0002] Urban underground integrated pipeline corridors, as important infrastructure for the intensive laying of municipal pipelines, are known as the city's "lifeline" tunnels. Their safety, durability, and waterproof performance are crucial to urban operations. Traditional reinforced concrete pipeline corridors are widely used due to their mature technology and readily available materials. However, they face many challenges in actual service: their concrete main structure is extremely susceptible to cracking under loads such as external soil pressure, water pressure changes, and vehicle dynamic loads during operation. These cracks often penetrate quickly, not only weakening the integrity and bearing capacity of the structure, but also providing a convenient channel for corrosive ions in groundwater and soil, causing the internal steel bars to rust and expand faster, and then causing the concrete protective layer to peel off. This deterioration process significantly shortens the service life of the pipeline corridor and significantly increases the high maintenance and repair costs in the later stages. In addition, the production and installation methods of existing pipeline corridors are mainly divided into two forms: on-site cast-in-place and full-section prefabrication. On-site cast-in-place construction suffers from long construction times, significant environmental impacts, and difficult quality control. Meanwhile, prefabricated pipe corridors, with their high transportation and hoisting costs, difficulty in on-site docking, and poor sealing of joints, struggle to meet the stringent requirements of modern cities for long-life, high reliability, and low-maintenance underground infrastructure. Therefore, there is an urgent need to develop a new pipe corridor structural system with greater toughness, stronger crack resistance, and superior durability to overcome the shortcomings of existing technologies and meet the needs of modern urban development. Summary of the Invention

[0003] The present invention discloses an assembled ECC steel plate-concrete composite pipe gallery, which aims to solve the above-mentioned problems.

[0004] The present invention adopts the following scheme:

[0005] An assembled ECC steel plate-concrete composite pipe gallery comprises: an ECC steel plate-prefabricated steel cage composite panel suitable for installation at the bottom, an ECC steel plate-concrete composite wall installed on both sides, and a concrete composite panel installed on the top, wherein an ECC steel plate is arranged above the concrete composite panel, and the ECC steel plate-prefabricated steel cage composite panel, the ECC steel plate-concrete composite wall, the concrete composite panel, and the ECC steel plate are used to form a pipe gallery with an ECC steel plate; wherein the ECC steel plate-prefabricated steel cage composite panel at the bottom and the concrete composite panel at the top are both connected to the two panels by anchoring bent bars. The outer ECC steel plate on the side is connected to the concrete composite wall; wherein, the outer ECC steel plate-prefabricated steel cage composite plate includes a second outer ECC shell arranged at the bottom, and a second steel plate connected to the inner side of the second outer ECC shell, and a plurality of second bolts are respectively arranged on both sides of the top surface of the second steel plate for connection with the outer ECC steel plate-concrete composite wall; and a plurality of second tension screws are arranged on the top surface of the second steel plate, and a second lifting eye nut is provided at both ends of each second tension screw, and a second steel cage is connected through a plurality of second lifting eye nuts, and the second steel cage and the second steel plate are suitable for pouring core concrete during construction.

[0006] Furthermore, the concrete composite slab includes a first steel cage cast with a first precast concrete layer, a first tension screw arranged on the first steel cage, and a first lifting eye nut formed at both ends of the first tension screw; the top end of the first tension screw is connected to the outer ECC steel plate; and core concrete is cast between the outer ECC steel plate and the concrete composite slab to form the top of the pipe gallery.

[0007] Furthermore, the external ECC steel plate-concrete composite wall includes a third external ECC shell, and a third steel plate arranged on the inner side of the third external ECC shell, and a plurality of third bolts are provided at the upper and lower ends of the inner side of the third steel plate; and a plurality of third tension screws are arranged on the inner side of the third steel plate, and third lifting nuts are provided at both ends of the third tension screws, and a third steel cage is connected through the third lifting nuts, and the top of the third steel cage is connected to the second precast concrete layer.

[0008] Furthermore, haunch reinforcement is provided on the inner sides of the upper and lower ends of the second precast concrete layer.

[0009] Furthermore, the outer ECC layer of the outer ECC steel plate is reserved with holes for installing and tightening the eye nuts, and the holes are provided with crisscross prefabricated reinforcements, and the holes are sealed by the filling ECC layer.

[0010] Furthermore, a paving mortar layer is laid between the outer ECC steel plate and the core concrete.

[0011] The present invention also provides a construction method for an assembled ECC steel plate-concrete composite pipe gallery, comprising the following steps:

[0012] S1. Prefabricated outsourced ECC steel plate:

[0013] According to the cross-sectional requirements of the top plate, rectangular steel plates are selected for processing, corresponding holes are drilled in the steel plates, and bolts are welded. After the steel plates are prepared, formwork is set up around them and at the edges of the holes, and ECC materials are poured. When pouring ECC, prefabricated reinforcement in a crisscross pattern is arranged at the reserved holes to ensure that the subsequent ECC filling can be effectively connected with the prefabricated ECC to form an integral structure.

[0014] S2. Precast concrete composite slab:

[0015] Arrange longitudinal and transverse reinforcement according to the cross-sectional design, spacing, and length requirements to form the first reinforcement cage. Tie and secure the two-way reinforcement to the corresponding first tensioning screws at the designed spacing. After the reinforcement is tied, support the formwork and pour the first precast concrete layer. At the same time, allow the transverse reinforcement to extend outside the concrete layer to form a reliable connection with the subsequent cast-in-place core concrete.

[0016] S3, Prefabricated outsourced ECC steel plate-prefabricated steel cage composite plate:

[0017] Based on the design requirements of the bottom plate cross section, rectangular steel plates were selected for processing. The corresponding holes were drilled in the second steel plate, and the second bolts were welded. After the second steel plate was prepared, the second tie screws and second eye nuts were tightened in the holes. Then, a formwork was set up on the outside of the third steel plate and the ECC material was poured. After the ECC reached the setting strength, the third steel plate with the ECC was inverted, and longitudinal and transverse steel bars were tied to the other end of the second tie screws to form a second reinforcement cage.

[0018] S4, Prefabricated outsourced ECC steel plate-concrete composite wall:

[0019] Tie the longitudinal and transverse reinforcements and the third tension screws together to form a third reinforcement cage, so that the lower longitudinal reinforcement extends outside the third reinforcement cage. Add longitudinal reinforcement and haunch reinforcement to the inner sides of the upper and lower ends of the third reinforcement cage, or bend them according to the node design to form stirrups. After the reinforcement is tied, support the formwork and pour the second precast concrete layer.

[0020] Select a rectangular steel plate for processing, drill corresponding holes on the third steel plate, and weld the third bolt. After the third steel plate is prepared, align it with the exposed end of the third tension screw and tighten it with the third eye nut. Then, set up the formwork outside the third steel plate and pour the ECC material.

[0021] S5. Prefabrication of anchorage bent reinforcement:

[0022] Process anchoring bends according to anchoring requirements;

[0023] S6. During on-site construction, anchor the left and right ECC steel plate-concrete composite walls to the ECC steel plate-prefabricated steel cage composite slab using anchoring bars, and initially pour the bottom core concrete to the bottom slab elevation; then, install and fix the concrete composite slab on top of the assembled composite wall using anchoring bars;

[0024] Then, core concrete is poured in layers in the structural cavity above the concrete composite slab; then a paving mortar layer is laid on the upper surface of the core concrete; after smoothing, the outer ECC steel plate is covered and tightened with the first eye nut; finally, ECC material is poured into the reserved holes to fill and repair to form a surface ECC layer, and then maintenance is carried out.

[0025] Beneficial effects:

[0026] The present invention utilizes a composite structure, which offers the advantages of lightweight, reducing transportation and lifting costs and improving construction efficiency. Furthermore, the surrounding ECC steel plates are sheathed. The ECC's exceptional crack resistance and durability stem from its ultra-high toughness (strain capacity 3%-5%), self-limiting microcracks (width <0.1mm), and self-healing properties. Combined with the continuously sealed steel plates, this creates a dual corrosion barrier, effectively preventing external moisture and corrosive ions from penetrating the structure and potentially corroding the reinforcement. Furthermore, the ECC's high ductility effectively absorbs deformation energy, preventing stress concentration-induced spalling of the concrete cover and maintaining structural integrity despite the corrosion and expansion of the reinforcement. Furthermore, the sheathed ECC steel plates in the composite structure are connected to the concrete slab via eyebolts, effectively preventing local buckling of the steel plates while also improving the structure's integrity, stability, and seismic resistance. The ECC also serves as an anchor for the core concrete. In addition, the steel plate and ECC-concrete precast components are rigidly connected by anchoring bending bars to form a coordinated force system, thereby improving the bending, shear and impact resistance. Finally, the structure facilitates construction and transportation, improves construction portability and other functions, thereby reducing construction labor costs and transportation costs, and has good mechanical properties and construction performance.

[0027] This structure ensures the underground pipeline corridor's waterproof and anti-corrosion properties while also offering excellent mechanical properties and structural integrity. Its simple joints and convenient construction significantly enhance the pipeline corridor's applicability in prefabricated underground structures, and holds broad application prospects in prefabricated engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of an ECC steel plate-concrete composite pipe gallery with an assembled ECC steel plate-concrete composite pipe gallery according to an embodiment of the present invention;

[0029] Figure 2 This is a structural schematic diagram of a concrete composite slab of an assembled ECC steel plate-concrete composite pipe gallery according to an embodiment of the present invention;

[0030] Figure 3 This is a structural schematic diagram of an assembled ECC steel plate-concrete composite pipe corridor with an ECC steel plate-prefabricated steel cage composite plate according to an embodiment of the present invention;

[0031] Figure 4 This is a structural schematic diagram of an ECC steel plate-concrete composite wall of an assembled ECC steel plate-concrete composite pipe gallery according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the assembly structure of an assembled ECC steel plate-concrete composite pipe gallery before the core concrete is poured according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the assembled front structure of an assembled ECC steel plate-concrete composite pipe gallery before the core concrete is poured according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the assembled structure of an ECC steel plate-concrete composite pipe gallery after pouring core concrete in accordance with an embodiment of the present invention;

[0035] Reference numerals:

[0036] 1. Outer ECC steel plate; 11. First outer ECC shell; 12. First steel plate; 13. First bolt; 14. Tile precast reinforcement;

[0037] 2. Concrete composite slab; 24. First reinforcement cage; 25. First tension screw; 26. First eye nut; 27. First precast concrete layer;

[0038] 3. Outer ECC steel plate-prefabricated steel cage composite plate; 31. Second outer ECC shell; 32. Second steel plate; 33. Second stud; 34. Second steel cage; 35. Second tension screw; 36. Second eye nut;

[0039] 4. External ECC steel plate-concrete composite wall; 41. Third external ECC shell; 42. Third steel plate; 43. Third stud; 44. Third reinforcement cage; 45. Third tension screw; 46. Third eye nut; 47. Second precast concrete layer; 48. Add haunch reinforcement;

[0040] 5. Anchoring bent reinforcement;

[0041] 6. Core concrete;

[0042] 7. Pavement mortar layer;

[0043] 8. Fill in the ECC layer. DETAILED DESCRIPTION

[0044] Example 1

[0045] Combine Figures 1 to 7 As shown, this embodiment provides an assembled outsourced ECC steel plate-concrete composite pipe gallery, comprising: an outsourced ECC steel plate-prefabricated steel cage composite plate 3 suitable for installation at the bottom, an outsourced ECC steel plate-concrete composite wall 4 installed on both sides, and a concrete composite plate 2 installed on the top, and an outsourced ECC steel plate 1 is arranged above the concrete composite plate 2, and the outsourced ECC steel plate-prefabricated steel cage composite plate 3, the outsourced ECC steel plate-concrete composite wall 4, the concrete composite plate 2 and the outsourced ECC steel plate 1 are used to form a pipe gallery shape whose outer surfaces are all wrapped with ECC steel plates; wherein, the outsourced ECC steel plate-prefabricated steel cage composite plate 3 at the bottom and the concrete composite plate 2 at the top are both connected to the outsourced ECC steel plate-concrete composite wall 4 on both sides through anchoring bent bars 5.

[0046] Combine Figures 1 to 2 As shown, in this embodiment, the concrete composite slab 2 includes a first reinforcement cage 24 with a first precast concrete layer 27, first tie rods 25 arranged on the first reinforcement cage 24, and first eye nuts 26 formed at both ends of the first tie rods 25. The top ends of the first tie rods 25 are connected to the outer ECC steel plate 1 via the first eye nuts 26. Core concrete 6 is poured between the outer ECC steel plate 1 and the first reinforcement cage 24 to form the top of the tunnel. The concrete composite slab 2 is set at the top, and the first precast concrete layer 27 with the first reinforcement cage 24 improves the load-bearing capacity. Here, the first outer ECC shell 11 on the outside of the outer ECC steel plate 1 has holes for installing and tightening eye nuts, and for installing and tightening the first eye nuts 26, so that the outer ECC steel plate 1 and the concrete composite slab 2 form an integral structure; preferably, a cross-shaped prefabricated reinforcement 14 is provided at the hole, and the hole is sealed by a filling ECC layer 8 to form a complete ECC protective layer. The cross-shaped prefabricated reinforcement 14 is made of steel bar material to ensure that the subsequent filling ECC can be effectively connected with the prefabricated ECC to form an integral structure. Preferably, a paving mortar layer 7 is laid between the outer ECC steel plate 1 and the core concrete 6, so that the outer ECC steel plate 1 can be covered and installed after the core concrete 6 is poured to form an integral structure; this practice can reduce the interface bubbles and pores between coarse aggregates generated during covering.

[0047] In this embodiment, the outer ECC steel plate 1 includes a first steel plate 12 and a first outer ECC shell 11 wrapped around the outside of the first steel plate 12. A plurality of first studs 13 are provided on the inner side surfaces of both ends of the first steel plate 12. By prefabricating the outer ECC steel plate 1 and the concrete composite slab 2 separately and assembling them during construction, the transportation and assembly of the prefabricated components are facilitated. Furthermore, since a paving mortar layer 7 needs to be laid between the outer ECC steel plate 1 and the core concrete 6, these layers need to be prefabricated separately and connected during assembly to facilitate the laying of the paving mortar layer 7.

[0048] Combine Figure 3 As shown, the outer ECC steel plate-prefabricated steel cage composite panel 3 includes a second outer ECC shell 31 provided at the bottom, a second steel plate 32 connected to the inner side of the second outer ECC shell 31, and a plurality of second bolts 33 are arranged on both sides of the top surface of the second steel plate 32 for connection with the outer ECC steel plate-concrete composite wall 4; and a plurality of second tension screws 35 are provided on the top surface of the second steel plate 32, each of which is provided with a second eye nut 36 at both ends, and is connected to a second steel cage 34 through a plurality of second eye nuts 36 at the top. The space between the second steel cage 34 and the second steel plate 32 is suitable for pouring core concrete 6 during construction. Pouring the core concrete 6 during assembly can make the component lighter during transportation on the one hand, and facilitate installation on the other hand.

[0049] Combine Figure 4 As shown, the ECC steel plate-concrete composite wall 4 includes a third ECC shell 41 and a third steel plate 42 disposed inside the third ECC shell 41. A plurality of third bolts 43 are disposed on the upper and lower ends of the inner side surface of the third steel plate 42. Furthermore, a plurality of third tension screws 45 are disposed on the inner side of the third steel plate 42. Third eye nuts 46 are disposed at both ends of the third tension screws 45, which are connected to a third reinforcement cage 44 via the third eye nuts 46. The top of the third reinforcement cage 44 is connected to a second precast concrete layer 47. Preferably, axillary reinforcement 48 is disposed inside the upper and lower ends of the second precast concrete layer 47. The axillary reinforcement 48 disposed at both ends of the second precast concrete layer 47 not only improves the bearing capacity of the node, but also facilitates the placement of the top plate during construction and improves the anchoring capacity of the reinforcement between the bottom plate and the top plate.

[0050] It should be noted that when the components on adjacent sides are connected, anchoring bars 5 are also provided. The anchoring bars 5 connect the prefabricated components into an integral structure through the combined action of the core concrete 6 and the studs.

[0051] In this embodiment, the ECC steel plate-prefabricated steel cage composite slab 3, the ECC steel plate-concrete composite wall 4, and the concrete composite slab 2 and the ECC steel plate 1 are all prefabricated components. The first, second, and third bolts 13, 33, and 43 described in this embodiment can be bolts of the same specifications. The first, second, and third tension screws 25, 35, and 45 can be tension screws of the same specifications. The first, second, and third eye nuts 26, 36, and 46 can also be eye nuts of the same specifications.

[0052] Example 2

[0053] Combine Figures 1 to 7 As shown, this embodiment also provides a construction method for an assembled ECC steel plate 1-concrete composite pipe gallery, comprising the following steps:

[0054] S1, Prefabricated Outer ECC Steel Plate 1:

[0055] According to the design requirements of the top plate cross-section, rectangular steel plates of appropriate sizes are selected for processing. According to the design and calculation requirements of the size and spacing of the tension screws, corresponding holes are drilled in the first steel plate 12, and the first bolts 13 are welded according to the anchoring calculation requirements. After the preparation of the first steel plate 12 is completed, formwork is set up around it and at the edges of the holes, and ECC material is poured to form the first outer ECC shell 11. When pouring the ECC, prefabricated reinforcement 14 in a cross pattern is arranged at the reserved holes to ensure that the subsequent ECC layer 8 can be effectively connected with the first outer ECC shell 11 to form an integral structure.

[0056] S2, Precast concrete composite slab 2:

[0057] Arrange longitudinal and transverse reinforcements according to the cross-sectional design, spacing, and length requirements to form a first reinforcement cage 24. Tie and secure the two-way reinforcements to the corresponding first tensioning screws 25 at the designed spacing. After the reinforcements are tied, formwork is supported and the concrete layer is poured. It should be noted that while one end of the first tensioning screw 25 is tightened with the first eye nut 26, the exposed length of the other end must remain consistent to ensure precise alignment with the reserved holes in the outer ECC steel plate 1 during on-site construction. At the same time, the transverse reinforcement should extend outside the concrete layer to form a reliable connection with the subsequent cast-in-place core concrete 6.

[0058] S3, Prefabricated outsourced ECC steel plate-prefabricated steel cage composite plate 3:

[0059] Based on the bottom plate cross-section design requirements, rectangular steel plates are selected for processing. Appropriate holes are drilled in the second steel plate 32, and second bolts 33 are welded. After the second steel plate 32 is prepared, the second tie screws 35 and second eye nuts 36 are tightened in the holes. A formwork is then set up outside the third steel plate 42, and the ECC material is poured. After the ECC reaches the setting strength, the ECC-wrapped third steel plate 42 is inverted, and longitudinal and transverse steel bars are tied to the other ends of the second tie screws 35 to form a second reinforcement cage 34. The configuration of the steel bars must strictly meet the cross-section design, spacing, and length calculation requirements.

[0060] S4, Prefabricated ECC steel plate-concrete composite wall 4:

[0061] The longitudinal and transverse steel bars and the third tension screw 45 are tied together to form a third steel cage 44, so that the lower longitudinal bars extend outside the steel cage, and longitudinal bars and haunch bars are added to the inner sides of the upper and lower ends of the third steel cage 44, or bent according to the node design to form stirrups; after the steel bars are tied, formwork is supported and a second precast concrete layer 47 is poured; the haunch bars are provided at the intersection of the outer ECC steel plate-concrete composite wall 4 and the outer ECC steel plate-precast steel cage composite slab 3 and the concrete composite slab 2;

[0062] Next, a rectangular steel plate is selected for processing, corresponding holes are drilled in the third steel plate 42, and a third bolt 43 is welded. After the third steel plate 42 is prepared, it is aligned with the exposed end of the third tension screw 45 and tightened with the third eye nut 46. Then, a formwork is set up outside the third steel plate 42 and ECC material is poured to form the outer ECC steel plate-concrete composite wall 4.

[0063] S5, prefabrication of anchoring bent reinforcement 5:

[0064] According to the anchorage calculation requirements, strictly configure the node design calculation requirements that meet the anchorage design, spacing and length to process the anchorage bend 5;

[0065] S6. During on-site construction, the left and right outer ECC steel plate-concrete composite walls 4 are anchored to the outer ECC steel plate-prefabricated steel cage composite slab 3 using anchoring bent bars 5, and the bottom core concrete 6 is initially poured to the bottom slab elevation; then the concrete composite slab 2 is installed and fixed on top of the assembled composite wall using anchoring bent bars 5;

[0066] Then, core concrete 6 is poured in layers in the structural cavity above the concrete composite slab 2; then, a paving mortar layer 7 is laid on the upper surface of the core concrete 6; after smoothing, the outer ECC steel plate 1 is covered and tightened with the first eye nut 26; finally, ECC material is poured into the reserved holes for filling and repair to form a surface ECC layer 8, which is then cured.

[0067] This solution can meet the strength structure requirements of the pipeline corridor on the one hand, and facilitate the transportation of prefabricated components on the other hand. It is also convenient for construction, which improves the applicability of the pipeline corridor in prefabricated underground structures and has broad application prospects in the field of prefabricated and assembled engineering.

[0068] It should be understood that the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0069] The above description of the drawings used in the implementation manner only shows certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without making any creative efforts.

Claims

1. An assembled ECC steel plate-concrete composite pipe gallery, characterized in that: include: Suitable for installation at the bottom of the outer ECC steel plate - prefabricated steel cage composite plate, installed on both sides of the outer ECC steel plate - concrete composite wall and installed on the top of the concrete composite plate, and the outer ECC steel plate is arranged above the concrete composite plate, and the outer ECC steel plate - prefabricated steel cage composite plate, the outer ECC steel plate - concrete composite wall and the concrete composite plate and the outer ECC steel plate are used to form a pipe gallery with outer ECC steel plates; wherein the outer ECC steel plate - prefabricated steel cage composite plate at the bottom and the concrete composite plate at the top are both connected to the outer ECC steel plate - concrete on both sides by anchoring bending bars. Soil composite wall connection; wherein, the outsourced ECC steel plate-prefabricated steel cage composite plate includes a second outsourced ECC shell arranged at the bottom, a second steel plate connected to the inner side of the second outsourced ECC shell, and a plurality of second bolts are respectively arranged on both sides of the top surface of the second steel plate for connection with the outsourced ECC steel plate-concrete composite wall; and a plurality of second tension screws are arranged on the top surface of the second steel plate, and a second lifting eye nut is provided at both ends of each second tension screw, and a second steel cage is connected through a plurality of second lifting eye nuts, and the second steel cage and the second steel plate are suitable for pouring core concrete during construction.

2. The assembled ECC steel plate-concrete composite pipe gallery according to claim 1 is characterized in that: The concrete composite slab includes a first steel cage cast with a first precast concrete layer, a first tension screw arranged on the first steel cage, and a first lifting eye nut formed at both ends of the first tension screw; the top end of the first tension screw is connected to the outer ECC steel plate; and core concrete is cast between the outer ECC steel plate and the concrete composite slab to form the top of the pipe gallery.

3. The assembled ECC steel plate-concrete composite pipe gallery according to claim 1 is characterized in that: The external ECC steel plate-concrete composite wall includes a third external ECC shell and a third steel plate arranged on the inner side of the third external ECC shell, and a plurality of third bolts are arranged on the upper and lower ends of the inner side of the third steel plate; and a plurality of third tension screws are arranged on the inner side of the third steel plate, and third lifting nuts are provided at both ends of the third tension screws, and a third steel cage is connected through the third lifting nuts, and the top of the third steel cage is connected to the second precast concrete layer.

4. The assembled ECC steel plate-concrete composite pipe gallery according to claim 3 is characterized in that: Axillary reinforcement is provided on the inner sides of the upper and lower ends of the second precast concrete layer.

5. The assembled ECC steel plate-concrete composite pipe gallery according to claim 2 is characterized in that: The outer ECC layer of the outer ECC steel plate is reserved with holes for installing and tightening eye nuts. The holes are provided with well-shaped prefabricated reinforcements, and the holes are sealed with a filling ECC layer.

6. The assembled ECC steel plate-concrete composite pipe gallery according to claim 2 is characterized in that: A paving mortar layer is laid between the outer ECC steel plate and the core concrete.

7. A construction method for an assembled ECC steel plate-concrete composite pipe gallery according to any one of claims 1 to 6, characterized in that: The steps include: S1. Prefabricated outsourced ECC steel plate: According to the cross-sectional requirements of the top plate, rectangular steel plates are selected for processing, corresponding holes are drilled in the steel plates, and bolts are welded. After the steel plates are prepared, formwork is set up around them and at the edges of the holes, and ECC materials are poured. When pouring ECC, prefabricated reinforcement in a crisscross pattern is arranged at the reserved holes to ensure that the subsequent ECC filling can be effectively connected with the prefabricated ECC to form an integral structure. S2. Precast concrete composite slab: Arrange longitudinal and transverse reinforcement according to the cross-sectional design, spacing, and length requirements to form the first reinforcement cage. Tie and secure the two-way reinforcement to the corresponding first tensioning screws at the designed spacing. After the reinforcement is tied, support the formwork and pour the first precast concrete layer. At the same time, ensure that the transverse reinforcement extends outside the first precast concrete layer to form a reliable connection with the subsequent cast-in-place core concrete. S3, Prefabricated outsourced ECC steel plate-prefabricated steel cage composite plate: Based on the design requirements of the bottom plate cross section, rectangular steel plates were selected for processing. The corresponding holes were drilled in the second steel plate, and the second bolts were welded. After the second steel plate was prepared, the second tie screws and second eye nuts were tightened in the holes. Then, a formwork was set up on the outside of the third steel plate and the ECC material was poured. After the ECC reached the setting strength, the third steel plate with the ECC was inverted, and longitudinal and transverse steel bars were tied to the other end of the second tie screws to form a second reinforcement cage. S4, Prefabricated outsourced ECC steel plate-concrete composite wall: Tie the longitudinal and transverse reinforcements and the third tension screws together to form a third reinforcement cage, so that the lower longitudinal reinforcement extends outside the third reinforcement cage. Add longitudinal reinforcement and haunch reinforcement to the inner sides of the upper and lower ends of the third reinforcement cage, or bend them according to the node design to form stirrups. After the reinforcement is tied, support the formwork and pour the second precast concrete layer. Select a rectangular steel plate for processing, drill corresponding holes on the third steel plate, and weld the third bolt. After the third steel plate is prepared, align it with the exposed end of the third tension screw and tighten it with the third eye nut. Then, set up the formwork outside the third steel plate and pour the ECC material. S5. Prefabrication of anchorage bent reinforcement: Process anchoring bends according to anchoring requirements; S6. During on-site construction, anchor the left and right ECC steel plate-concrete composite walls to the ECC steel plate-prefabricated steel cage composite slab using anchoring bars, and initially pour the bottom core concrete to the bottom slab elevation; then, install and fix the concrete composite slab on top of the assembled composite wall using anchoring bars; Then, core concrete is poured in layers in the structural cavity above the concrete composite slab; then a paving mortar layer is laid on the upper surface of the core concrete; after smoothing, the outer ECC steel plate is covered and tightened with the first eye nut; finally, ECC material is poured into the reserved holes for filling and repair to form a surface ECC layer, and then maintenance is carried out.

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