Construction method for circular excavation reserved core soil based on chain cutter excavation technology

Abstract

The application discloses a construction method of circular excavation reserved core soil based on chain cutter excavation technology, characterized in that underground construction includes a roof, outer walls and a bottom plate, a construction device includes a pushing device and a chain cutter excavation device, and the construction method comprises the following main steps: 1) completing the construction of a working well; 2) completing the construction of the roof; 3) completing the installation of the outer wall excavation device, the outer wall pushing device and the outer wall, the right end of the outer wall pushing device pushing the left end of the outer wall rear end device, the outer wall chain cutter of the right end of the outer wall front end device excavating the rock-soil in front of the outer wall, the outer wall chain cutter running from right to left carrying the excavated rock-soil into the left working well and then discharging the rock-soil, the outer wall moving forward until the construction of the outer wall is completed; and 4) completing the construction of the bottom plate. The main advantages are that the construction method is safe and reliable, the labor intensity is low, the construction period is short, and the cost is low.

Description

Technical Field

[0001] This invention belongs to the field of underground engineering construction technology, specifically a construction method for pre-reserving core soil through ring excavation based on chain cutter excavation technology. Background Technology

[0002] Currently, the traditional method of excavating a ring to retain core soil mainly relies on manual labor combined with small machinery for the "ring excavation" part, employing segmented trenching in the width direction. Its main disadvantages include: safety hazards, high labor intensity, long construction period, and high cost. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of this invention is to provide a construction method for reserving core soil in ring excavation based on chain cutter excavation technology, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An underground structure 1 includes a top slab 1A, an outer wall 1B, and a bottom slab 1C. The length direction of the underground structure 1 is longitudinal, and construction of the underground structure 1 proceeds from left to right. The construction device 1D of the underground structure 1 includes a working well 1D1, a jacking device 2, and a chain cutter excavation device 3. The chain cutter excavation device 3 includes a chain cutter 3A for excavating rock and soil, and the chain cutter 3A includes a chain 8 and excavation cutters 9 mounted on the chain 8. The chain cutter excavation device 3 includes a front end device 4 at the front end and a rear end device 5 at the rear end. The chain cutter excavation device 3 includes an outer wall excavation device 3B for excavating rock and soil in front of the outer wall 1B and a bottom slab excavation device 3C for excavating rock and soil in front of the bottom slab 1C. The external wall excavation device 3B includes an external wall chain cutter 3BA, an external wall front end device 4B, and an external wall rear end device 5B. The external wall chain cutter 3BA encloses the external wall 1B, and the external wall front end device 4B and the external wall rear end device 5B are located at the front and rear ends of the external wall 1B. The bottom plate excavation device 3C includes a bottom plate chain cutter 3CA, a bottom plate front end device 4C, and a bottom plate rear end device 5C. The bottom plate chain cutter 3CA encloses the bottom plate 1C, and the bottom plate front end device 4C and the bottom plate rear end device 5C are located at the front and rear ends of the bottom plate 1C. The jacking device 2 includes the outer wall jacking device 2B of the outer wall jacking device 3B and the bottom plate jacking device 2C of the bottom plate jacking device 3C. The construction method for the ring excavation and reserved core soil of the underground structure 1 includes the following main steps: 1) Complete the construction of the two longitudinal working wells 1D1 on the left and right sides; 2) Complete the construction of the top slab 1A within work 1D1; 3) Complete the installation of the external wall excavation device 3B, the external wall jacking device 2B and the external wall 1B. The right end of the external wall jacking device 2B jacks the left end of the external wall rear end device 5B. The external wall chain cutter 3BA at the right end of the external wall front end device 4B excavates the rock and soil in front of the external wall 1B. The external wall chain cutter 3BA, which runs from right to left, carries the excavated rock and soil into the left working well 1D1 and then discharges it. The external wall 1B moves forward with it until the construction of the external wall 1B is completed. 4) Complete the installation of the bottom plate excavation device 3C, the bottom plate jacking device 2C and the bottom plate 1C. The right end of the bottom plate jacking device 2C pushes the left end of the bottom plate rear end device 5C. The bottom plate chain cutter 3CA at the right end of the bottom plate front end device 4C excavates the rock and soil in front of the bottom plate 1C. The bottom plate chain cutter 3CA, which runs from right to left, carries the excavated rock and soil into the left working well 1D1 and then discharges it. The bottom plate 1C moves forward with it until the construction of the bottom plate 1C is completed. 5) Continue subsequent work until the construction of underground structure 1 is completed.

[0005] It should be noted that steps 3) and 4) are not in any particular order.

[0006] It should be noted that: Working shaft 1D1 can be equipped with three working shafts: left, middle and right. Underground construction starts from the middle working shaft and proceeds to the left and right sides. More working shafts can also be used.

[0007] It should be noted that: Underground structure 1 can be an underground passage.

[0008] As a further embodiment of the present invention: the top plate 1A includes two or more longitudinally arranged longitudinal beams 1A1 and a narrow top plate 1A2 embedded in the longitudinal beams 1A1 on both sides laterally; the chain cutter excavation device 3 includes a beam excavation device 3A1 for excavating the rock and soil in front of the longitudinal beams 1A1 and a top plate excavation device 3A2 for excavating the rock and soil in front of the narrow top plate 1A2. The beam excavation device 3A1 includes a beam chain cutter 3A1A, a beam front end device 4A1, and a beam rear end device 5A1. The beam chain cutter 3A1A encloses the longitudinal beam 1A1, and the beam front end device 4A1 and the beam rear end device 5A1 are located at the front and rear ends of the longitudinal beam 1A1. The roof excavation device 3A2 includes a chain cutter 3A2A, a front end device 4A2, and a rear end device 5A2. The chain cutter 3A2A encloses the narrow roof 1A2, and the front end device 4A2 and the rear end device 5A2 are located at the front and rear ends of the narrow roof 1A2. The jacking device 2 includes a beam jacking device 2A1 of the jacking beam excavation device 3A1 and a top plate jacking device 2A2 of the jacking top plate excavation device 3A2. Step 2) is to first complete the construction of the longitudinal beam 1A1, and then complete the construction of the narrow top plate 1A2 based on the longitudinal beam 1A1.

[0009] As a further aspect of the present invention: the longitudinal beam 1A1 includes an I-beam 1H.

[0010] As a further embodiment of the present invention: the longitudinal beam 1A1 includes a connecting plate 6 located at the top of the longitudinal beam 1A1. The connecting plate 6 includes an inner connecting plate 6A and a U-shaped connecting plate 6U with its opening facing left. The inner connecting plates 6A, arranged at intervals from right to left, are located within the U-shape of the U-shaped connecting plate 6U. All longitudinal beams 1A1 are connected together at the top by the connecting plate 6. The chain cutter digging device 3 includes a connecting plate digging device 36. The connecting plate digging device 36 includes a connecting plate chain cutter 36A, a connecting plate front end device 46, and a connecting plate rear end device 56. The connecting plate chain cutter 36A encloses the U-shaped connecting plate 6U. The connecting plate front end device 46 and the connecting plate rear end device 56 are located at the front and rear ends of the U-shaped connecting plate 6U. As a further aspect of the present invention: the outer wall 1B is assembled in the length and height directions, and the base plate 1C is also assembled in the length and width directions.

[0011] As a further embodiment of the present invention, the exterior wall 1B and / or the base plate 1C can also adopt the same structure and the same construction method as the top plate 1A.

[0012] As a further aspect of the present invention: both the outer wall 1B and the base plate 1C include a steel structure frame 7, the steel structure frame 7 includes several short steel structure frames 7A, and the steel structure frame 7, which is spliced ​​in the working well 1D1, is poured with concrete after the construction is completed.

[0013] As a further aspect of the present invention: the underground structure 1 includes a subway station 11, the subway station 11 includes a middle slab 1E located between the top slab 1A and the bottom slab 1C, the two sides of the middle slab 1E being connected to the inner side of the outer wall 1B in the lateral direction; the top slab 1A includes a top slab beam 1A3 whose two ends are fixedly connected to the outer wall 1B in the lateral direction; the construction method of the subway station 11 includes the following main steps: 1) Complete the construction of working shaft 1D1 and roof 1A; 2) Complete the construction of the exterior wall 1B and the base slab 1C within the working well 1D1; 3) Excavate the top of the U-shaped trench formed by the outer wall 1B and the bottom plate 1C from left to right, and fix the longitudinal beam 1A1 and the narrow top plate 1A2 into one piece in sections. Fix the top of the inner side of the outer wall 1B to the bottom of the top plate 1A into one piece. Complete the construction of the top plate cross beam 1A3 from left to right. 4) Excavate the soil and rock above the bottom plane of the middle plate 1E; 5) Complete the construction of the middle plate 1E; 6) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall 1B and the base plate 1C; 7) Secure the horizontal sides of the base plate 1C to the outer wall 1B as a whole; 8) Continue subsequent work until all construction of subway station 11 is completed.

[0014] As a further aspect of the present invention: the subway station 11 includes piles 11A, the base plate 1C includes pile holes 1C1, the middle plate 1E includes an internal support frame 1E1 that does not affect the construction of piles 11A, and the construction of steps 5 to 8 in claim 6 includes the following main steps: 1) Complete the construction of the internal support frame 1E1; 2) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall 1B and the base plate 1C; 3) Complete the construction of pile 11A; 4) Complete the construction of the middle plate 1E; 5) Continue subsequent work until all construction of subway station 11 is completed.

[0015] As a further aspect of the present invention: the subway station 11 includes an orthogonal subway station 112 for two orthogonal subway lines.

[0016] In summary, compared with the prior art, the present invention creatively adopts a clever structure based on chain cutter excavation technology. The construction of the top slab, outer wall and bottom slab is completed first, and then excavation and subsequent construction are carried out from top to bottom in the closed area enclosed by the top slab, outer wall and bottom slab. In particular, the full length excavation can be carried out at the same time in the width direction. The main advantages are: the construction method is safe and reliable, the labor intensity is low, the construction period is short and the cost is low. Attached Figure Description

[0017] Figure 1 It is a structural schematic diagram of the working well 1D1 and the jacking device 2 that make up the construction device 1D, a structural schematic diagram of the reinforced concrete slab 1A2A that makes up the narrow top slab 1A2, and a structural schematic diagram of the short concrete slab 1A2A1 that makes up the reinforced concrete slab 1A2A. Figure 2 yes Figure 1 The AA view is also a structural schematic diagram of the top slab 1A and the outer wall 1B that make up the underground building 1, and a structural schematic diagram of the top slab beam 1A3 that makes up the top slab 1A. Figure 3 This is a structural schematic diagram of the beam jacking device 2A1 that makes up the jacking device 2, and also a structural schematic diagram of the beam front end device 4A1 and the beam rear end device 5A1 that make up the beam excavation device 3A1. Figure 4 yes Figure 3 The AA view is also a structural schematic diagram of the chain cutter excavator 3 that makes up the construction device 1D, and a structural schematic diagram of the chain cutter 3A that makes up the cutter excavator 3. Figure 5 This is a structural schematic diagram of the I-beam 1H that makes up the longitudinal beam 1A1; Figures 3 to 5 This is also a schematic diagram of the construction sequence of longitudinal beam 1A1 when there is no connecting plate 6; Figure 6 This is a schematic diagram of the chain 8 and the digging blade 9 that make up the chain cutter 3A; Figure 7 yes Figure 6 The C-direction view; Figure 8 yes Figure 6 The D-direction view; Figure 9 It is a structural schematic diagram of the connecting plate 6 that makes up the longitudinal beam 1A1, a structural schematic diagram of the inner connecting plate 6A and the U-shaped connecting plate 6U that make up the connecting plate 6, a structural schematic diagram of the chain cutter cover 6U1 that makes up the U-shaped connecting plate 6U, a structural schematic diagram of the connecting plate digging device 36 that makes up the chain cutter digging device 3, and a structural schematic diagram of the connecting plate chain cutter 36A, the front end device 46 of the connecting plate, and the rear end device 56 of the connecting plate digging device 36. Figure 10 yes Figure 9 BB view; Figure 11 This is a structural schematic diagram of the beam excavation device 3A1 that makes up the chain cutter excavation device 3, and also a structural schematic diagram of the beam chain cutter 3A1A that makes up the beam excavation device 3A1. Figure 12 This is a structural diagram of the short I-beam 1H1 that makes up the I-beam 1H; Figure 11 and Figure 12 This is also a schematic diagram of the working sequence of longitudinal beam 1A1 when there is connecting plate 6; Figure 13 It is a structural schematic diagram of the front end device 4 and the rear end device 5 that make up the chain cutter digging device 3; it is also a structural schematic diagram of the top plate pushing device 2A2 that makes up the pushing device 2; and it is also a structural schematic diagram of the front end device 4A2 and the rear end device 5A2 that make up the top plate digging device 3A2. Figure 14 yes Figure 13 The AA view is also a structural schematic diagram of the top plate excavation device 3A2 that makes up the chain cutter excavation device 3; Figure 15 This is a structural schematic diagram of the reinforced concrete slab 1A2A that makes up the narrow top slab 1A2; Figure 16 This is a structural schematic diagram of the plate chain cutter 3A2A that makes up the top excavation device 3A2; Figure 17 This is a structural schematic diagram of the longitudinal beam 1A1 that makes up the top plate 1A; Figures 14 to 17 This is also the work sequence diagram for constructing the narrow roof slab 1A2; Figure 18 This is a structural diagram of the external wall chain cutter 3BA, the external wall front end device 4B and the external wall rear end device 5B that make up the external wall excavation device 3B, and it is also a structural diagram of the external wall jacking device 2B that makes up the jacking device 2. Figure 19 yes Figure 18 AA view; Figure 20 This is a structural schematic diagram of the base plate digging device 3C that makes up the chain cutter digging device 3, and also a structural schematic diagram of the base plate chain cutter 3CA that makes up the base plate digging device 3C. Figure 21 yes Figure 20 The AA view is also a structural schematic diagram of the bottom plate jacking device 2C that makes up the jacking device 2, as well as a structural schematic diagram of the bottom plate front end device 4C and bottom plate rear end device 5C that make up the bottom plate excavation device 3C. Figure 22 This is a structural schematic diagram of the base plate 1C that makes up subway station 11; Figure 23 It is a structural schematic diagram of the middle plate 1E and piles 11A that make up the subway station 11, a structural schematic diagram of the pile hole 1C1 that makes up the bottom plate 1C, a structural schematic diagram of the inner support frame 1E1 that makes up the middle plate 1E, a structural schematic diagram of the steel structure frame 7 that makes up the bottom plate 1C, and a structural schematic diagram of the short steel structure frame 7A that makes up the steel structure frame 7. Figures 19 to 23 This is also a sequence diagram of subsequent operations after the completion of top plate 1A1; Figure 24 This is a structural diagram of the orthogonal subway station 112 that makes up subway station 11.

[0018] Underground Structure 1, Top Slab 1A, Longitudinal Beam 1A1, Narrow Top Slab 1A2, Reinforced Concrete Slab 1A2A, Short Concrete Slab 1A2A1, Top Slab Horizontal Beam 1A3, Exterior Wall 1B, Bottom Slab 1C, Pile Hole 1C1, Construction Device 1D, Working Shaft 1D1, Middle Slab 1E, Internal Support Frame 1E1, I-Beam 1H, Subway Station 11, Pile 11A, Orthogonal Subway Station 112, Jacking Device 2, Exterior Wall Jacking Device 2B, Bottom Slab Jacking Device 2C, Chain Cutter Excavation Device 3, Chain Cutter 3A, Beam Excavation Device 3A1, Beam Chain Cutter 3A1A, Top Slab Excavation Device 3A2, Slab Chain Cutter 3A2A 3B (Exterior Wall Excavation Device), 3BA (Exterior Wall Chain Cutter), 3C (Base Plate Excavation Device), 3CA (Base Plate Chain Cutter), 36 (Connecting Plate Excavation Device), 36A (Connecting Plate Chain Cutter), 4 (Front-end Device), 4A1 (Beam Front-end Device), 4A2 (Plate Front-end Device), 4B (Exterior Wall Front-end Device), 4C (Base Plate Front-end Device), 46 (Connecting Plate Front-end Device), 5 (Rear-end Device), 5A1 (Beam Rear-end Device), 5A2 (Rear-end Device), 5B (Exterior Wall Rear-end Device), 5C (Base Plate Rear-end Device), 56 (Connecting Plate Rear-end Device), 6 (Connecting Plate), 6A (Inner Connecting Plate), 6U (U-shaped Connecting Plate), 6U1 (Chain Cutter Cover), 7 (Steel Structure Frame), 8 (Chain), 9 (Excavation Cutter) Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-24 In this embodiment of the invention, the underground structure 1 includes a top slab 1A, an outer wall 1B, and a bottom slab 1C. The length direction of the underground structure 1 is longitudinal, and the underground structure 1 is constructed from left to right. The construction device 1D of the underground structure 1 includes a working well 1D1, a jacking device 2, and a chain cutter excavation device 3. The chain cutter excavation device 3 includes a chain cutter 3A for excavating rock and soil. The chain cutter 3A includes a chain 8 and an excavation cutter 9 installed on the chain 8. The chain cutter excavation device 3 includes a front end device 4 located at the front end and a rear end device 5 located at the rear end. The chain cutter excavation device 3 includes an outer wall excavation device 3B for excavating rock and soil in front of the outer wall 1B and a bottom slab excavation device 3C for excavating rock and soil in front of the bottom slab 1C. The external wall excavation device 3B includes an external wall chain cutter 3BA, an external wall front end device 4B, and an external wall rear end device 5B. The external wall chain cutter 3BA encloses the external wall 1B, and the external wall front end device 4B and the external wall rear end device 5B are located at the front and rear ends of the external wall 1B. The bottom plate excavation device 3C includes a bottom plate chain cutter 3CA, a bottom plate front end device 4C, and a bottom plate rear end device 5C. The bottom plate chain cutter 3CA encloses the bottom plate 1C, and the bottom plate front end device 4C and the bottom plate rear end device 5C are located at the front and rear ends of the bottom plate 1C. The jacking device 2 includes the outer wall jacking device 2B of the outer wall jacking device 3B and the bottom plate jacking device 2C of the bottom plate jacking device 3C. The construction method for the ring excavation and reserved core soil of the underground structure 1 includes the following main steps: 1) Complete the construction of the two longitudinal working wells 1D1 on the left and right sides; 2) Complete the construction of the top slab 1A within work 1D1; 3) Complete the installation of the external wall excavation device 3B, the external wall jacking device 2B and the external wall 1B. The right end of the external wall jacking device 2B jacks the left end of the external wall rear end device 5B. The external wall chain cutter 3BA at the right end of the external wall front end device 4B excavates the rock and soil in front of the external wall 1B. The external wall chain cutter 3BA, which runs from right to left, carries the excavated rock and soil into the left working well 1D1 and then discharges it. The external wall 1B moves forward with it until the construction of the external wall 1B is completed. 4) Complete the installation of the bottom plate excavation device 3C, the bottom plate jacking device 2C and the bottom plate 1C. The right end of the bottom plate jacking device 2C pushes the left end of the bottom plate rear end device 5C. The bottom plate chain cutter 3CA at the right end of the bottom plate front end device 4C excavates the rock and soil in front of the bottom plate 1C. The bottom plate chain cutter 3CA, which runs from right to left, carries the excavated rock and soil into the left working well 1D1 and then discharges it. The bottom plate 1C moves forward with it until the construction of the bottom plate 1C is completed. 5) Continue subsequent work until the construction of underground structure 1 is completed.

[0021] It should be noted that steps 3) and 4) are not in any particular order.

[0022] It should be noted that: Working shaft 1D1 can be equipped with three working shafts: left, middle and right. Underground construction starts from the middle working shaft and proceeds to the left and right sides. More working shafts can also be used.

[0023] It should be noted that: Underground structure 1 can be an underground passage.

[0024] The top plate 1A includes two or more longitudinally arranged longitudinal beams 1A1 and a narrow top plate 1A2 embedded in the longitudinal beams 1A1 on both sides. The chain cutter excavation device 3 includes a beam excavation device 3A1 for excavating the rock and soil in front of the longitudinal beams 1A1 and a top plate excavation device 3A2 for excavating the rock and soil in front of the narrow top plate 1A2. The beam excavation device 3A1 includes a beam chain cutter 3A1A, a beam front end device 4A1, and a beam rear end device 5A1. The beam chain cutter 3A1A encloses the longitudinal beam 1A1, and the beam front end device 4A1 and the beam rear end device 5A1 are located at the front and rear ends of the longitudinal beam 1A1. The roof excavation device 3A2 includes a chain cutter 3A2A, a front end device 4A2, and a rear end device 5A2. The chain cutter 3A2A encloses the narrow roof 1A2, and the front end device 4A2 and the rear end device 5A2 are located at the front and rear ends of the narrow roof 1A2. The jacking device 2 includes a beam jacking device 2A1 of the jacking beam excavation device 3A1 and a top plate jacking device 2A2 of the jacking top plate excavation device 3A2. Step 2) is to first complete the construction of the longitudinal beam 1A1, and then complete the construction of the narrow top plate 1A2 based on the longitudinal beam 1A1.

[0025] It should be noted that the longitudinal beam 1A1 can also adopt the same structure as the narrow top plate 1A2.

[0026] It should be noted that step 2 can be completed by using the same principle as horizontal directional drilling to construct the longitudinal beam 1A1.

[0027] It should be noted that the narrow roof slab 1A2 includes a reinforced concrete slab 1A2A, which in turn includes several short concrete slabs 1A2A1. The reinforced concrete slab 1A2A is assembled within the working well 1D1.

[0028] The longitudinal beam 1A1 includes an I-beam 1H.

[0029] It should be noted that: when constructing the longitudinal beam 1A1, the two sides of the I-beam 1H can be the chain knife cover of the beam chain knife 3A1A, and when constructing the narrow top plate 1A2, they can be the chain knife cover of the plate chain knife 3A2A.

[0030] It should be noted that: I-beam 1H can also be made by splicing together several short I-beams 1H1.

[0031] The longitudinal beam 1A1 includes a connecting plate 6 located at the top of the longitudinal beam 1A1. The connecting plate 6 includes an inner connecting plate 6A and a U-shaped connecting plate 6U with its opening facing left. The inner connecting plates 6A, arranged at intervals from right to left, are located within the U-shape of the U-shaped connecting plate 6U. All longitudinal beams 1A1 are connected together at the top by the connecting plates 6. The chain cutter digging device 3 includes a connecting plate digging device 36. The connecting plate digging device 36 includes a connecting plate chain cutter 36A, a connecting plate front end device 46, and a connecting plate rear end device 56. The connecting plate chain cutter 36A encloses the U-shaped connecting plate 6U. The connecting plate front end device 46 and the connecting plate rear end device 56 are located at the front and rear ends of the U-shaped connecting plate 6U. It should be noted that when the connecting plate 6 is made of thin steel plate, the excavation device 36 can be used without the connecting plate.

[0032] It should be noted that: chain cutter covers 6U1 can be provided on both sides of the U-shaped connecting plate 6U, and the chain cutters 36A on both sides of the connecting plate run inside the chain cutter covers 6U1.

[0033] The outer wall 1B is assembled in the length and height directions, and the base plate 1C is also assembled in the length and width directions.

[0034] The exterior wall 1B and / or the base slab 1C can also adopt the same structure and the same construction method as the top slab 1A.

[0035] The exterior wall 1B and the base plate 1C both include a steel structure frame 7, which includes several short steel structure frames 7A. The steel structure frame 7, which is spliced ​​in the working well 1D1, is poured with concrete after the construction is completed.

[0036] The underground structure 1 includes a subway station 11, which includes a middle slab 1E located between a top slab 1A and a bottom slab 1C. The two sides of the middle slab 1E are connected to the inner sides of the outer wall 1B on both sides in the lateral direction. The top slab 1A includes a top slab beam 1A3 that is fixedly connected to the outer wall 1B on both sides in the lateral direction. The construction method of the subway station 11 includes the following main steps: 1) Complete the construction of working shaft 1D1 and roof 1A; 2) Complete the construction of the exterior wall 1B and the base slab 1C within the working well 1D1; 3) Excavate the top of the U-shaped trench formed by the outer wall 1B and the bottom plate 1C from left to right, and fix the longitudinal beam 1A1 and the narrow top plate 1A2 into one piece in sections. Fix the top of the inner side of the outer wall 1B to the bottom of the top plate 1A into one piece. Complete the construction of the top plate cross beam 1A3 from left to right. 4) Excavate the soil and rock above the bottom plane of the middle plate 1E; 5) Complete the construction of the middle plate 1E; 6) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall 1B and the base plate 1C; 7) Secure the horizontal sides of the base plate 1C to the outer wall 1B as a whole; 8) Continue subsequent work until all construction of subway station 11 is completed.

[0037] The subway station 11 includes piles 11A, the base slab 1C includes pile holes 1C1, and the middle slab 1E includes an internal support frame 1E1 that does not affect the construction of piles 11A. The construction of steps 5 to 8 in claim 6 includes the following main steps: 1) Complete the construction of the internal support frame 1E1; 2) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall 1B and the base plate 1C; 3) Complete the construction of pile 11A; 4) Complete the construction of the middle plate 1E; 5) Continue subsequent work until all construction of subway station 11 is completed.

[0038] The subway station 11 includes an orthogonal subway station 112 for two orthogonal subway lines.

[0039] It should be noted that subway station 11 can also be diagonally intersecting.

[0040] It should be noted that subway station 11 can also be a subway station for intersecting subway lines with three or more levels.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In this invention, it should also be noted that the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate medium. The specific meaning of the terms in this invention can be understood according to the specific circumstances.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction method for pre-reserving core soil through ring excavation based on chain cutter excavation technology, characterized in that underground... The building (1) includes a top slab (1A), an outer wall (1B) and a bottom slab (1C). The length direction of the underground building (1) is longitudinal. The underground building (1) is constructed from left to right. The construction device (1D) of the underground building (1) includes a working well (1D1), a jacking device (2) and a chain cutter excavation device (3). The chain cutter excavation device (3) includes a chain cutter (3A) for excavating rock and soil. The chain cutter (3A) includes a chain (8) and an excavation cutter (9) installed on the chain (8). The chain cutter excavation device (3) includes a front end device (4) located at the front end and a rear end device (5) located at the rear end. The chain cutter excavation device (3) includes an outer wall excavation device (3B) for excavating rock and soil in front of the outer wall (1B) and a bottom slab excavation device (3C) for excavating rock and soil in front of the bottom slab (1C). The exterior wall excavation device (3B) includes an exterior wall cutter chain (3BA), an exterior wall front end device (4B), and an exterior wall rear end device (5B). The exterior wall cutter chain (3BA) encloses the exterior wall (1B), and the exterior wall front end device (4B) and the exterior wall rear end device (5B) are located at the front and rear ends of the exterior wall (1B). The bottom plate excavation device (3C) includes a bottom plate cutter chain (3CA), a bottom plate front end device (4C), and a bottom plate rear end device (5C). The bottom plate cutter chain (3CA) encloses the bottom plate (1C), and the bottom plate front end device (4C) and the bottom plate rear end device (5C) are located at the front and rear ends of the bottom plate (1C). The jacking device (2) includes the outer wall jacking device (2B) of the jacking outer wall excavation device (3B) and the bottom plate jacking device (2C) of the jacking bottom plate excavation device (3C). The construction method of the ring excavation and reserved core soil of the underground structure (1) includes the following main steps: 1) Complete the construction of the two longitudinal working wells (1D1) on the left and right sides; 2) Complete the construction of the top slab (1A) within the working period (1D1); 3) Complete the installation of the external wall excavation device (3B), the external wall jacking device (2B) and the external wall (1B). The right end of the external wall jacking device (2B) jacks the left end of the external wall rear end device (5B). The external wall chain cutter (3BA) at the right end of the external wall front end device (4B) excavates the rock and soil in front of the external wall (1B). The external wall chain cutter (3BA) running from right to left carries the excavated rock and soil into the left working well (1D1) and then discharges it. The external wall (1B) moves forward until the construction of the external wall (1B) is completed. 4) Complete the installation of the bottom plate excavation device (3C), the bottom plate jacking device (2C) and the bottom plate (1C). The right end of the bottom plate jacking device (2C) jacks the left end of the bottom plate rear end device (5C). The bottom plate cutter (3CA) at the right end of the bottom plate front end device (4C) excavates the rock and soil in front of the bottom plate (1C). The bottom plate cutter (3CA) running from right to left carries the excavated rock and soil into the left working well (1D1) and then discharges it. The bottom plate (1C) moves forward until the construction of the bottom plate (1C) is completed. 5) Continue subsequent work until the construction of the underground structure (1) is completed.

2. The construction method for pre-reserving core soil in ring excavation based on chain cutter excavation technology according to claim 1, characterized in that: The top plate (1A) includes two or more longitudinally arranged longitudinal beams (1A1) and a narrow top plate (1A2) embedded in the longitudinal beams (1A1) on both sides. The chain cutter excavation device (3) includes a beam excavation device (3A1) for excavating the rock and soil in front of the longitudinal beams (1A1) and a top plate excavation device (3A2) for excavating the rock and soil in front of the narrow top plate (1A2). The beam excavation device (3A1) includes a beam cutter chain (3A1A), a beam front end device (4A1), and a beam rear end device (5A1). The beam cutter chain (3A1A) encloses the longitudinal beam (1A1), and the beam front end device (4A1) and the beam rear end device (5A1) are located at the front and rear ends of the longitudinal beam (1A1). The roof excavation device (3A2) includes a plate chain cutter (3A2A), a front plate device (4A2), and a rear plate device (5A2). The plate chain cutter (3A2A) encloses the narrow roof (1A2), and the front plate device (4A2) and the rear plate device (5A2) are located at the front and rear ends of the narrow roof (1A2). The jacking device (2) includes the beam jacking device (2A1) of the jacking beam excavation device (3A1) and the top plate jacking device (2A2) of the jacking top plate excavation device (3A2). Step 2) is to first complete the construction of the longitudinal beam (1A1), and then complete the construction of the narrow top plate (1A2) based on the longitudinal beam (1A1).

3. The construction method for ring excavation with reserved core soil based on chain cutter excavation technology according to claim 2, characterized in that: The longitudinal beam (1A1) includes an I-beam (1H).

4. The construction method for reserving core soil in ring excavation based on chain cutter excavation technology according to claim 3, characterized in that: The longitudinal beam (1A1) includes a connecting plate (6) located at the top of the longitudinal beam (1A1). The connecting plate (6) includes an inner connecting plate (6A) and a U-shaped connecting plate (6U) with its opening facing left. The inner connecting plates (6A) arranged from right to left are located within the U-shape of the U-shaped connecting plate (6U). All longitudinal beams (1A1) are connected together at the top by the connecting plate (6). The chain cutter digging device (3) includes a connecting plate digging device (36). The connecting plate digging device (36) includes a connecting plate chain cutter (36A), a connecting plate front end device (46), and a connecting plate rear end device (56). The connecting plate chain cutter (36A) encloses the U-shaped connecting plate (6U). The connecting plate front end device (46) and the connecting plate rear end device (56) are located at the front and rear ends of the U-shaped connecting plate (6U).

5. The construction method for pre-reserving core soil through ring excavation based on chain cutter excavation technology according to claim 2, characterized in that: The exterior wall (1B) is assembled in the length and height directions, and the base plate (1C) is also assembled in the length and width directions.

6. The construction method for ring excavation with reserved core soil based on chain cutter excavation technology according to claim 5, characterized in that: The exterior wall (1B) and / or the base slab (1C) can also adopt the same structure and the same construction method as the top slab (1A).

7. A construction method for pre-reserving core soil through ring excavation based on chain cutter excavation technology according to claim 6, characterized in that: The exterior wall (1B) and the base plate (1C) both include a steel structure frame (7), which includes several short steel structure frames (7A). The steel structure frame (7) that is spliced ​​in the working well (1D1) is poured with concrete after the construction is completed.

8. The construction method for reserving core soil in ring excavation based on chain cutter excavation technology according to claim 7, characterized in that: The underground structure (1) includes a subway station (11), which includes a middle slab (1E) located between the top slab (1A) and the bottom slab (1C). The two sides of the middle slab (1E) are connected to the inner side of the outer wall (1B) on both sides. The top slab (1A) includes a top slab beam (1A3) that is fixedly connected to the outer wall (1B) on both sides. The construction method of the subway station (11) includes the following main steps: 1) Complete the construction of the working shaft (1D1) and the roof (1A); 2) Complete the construction of the exterior wall (1B) and the base slab (1C) within the working shaft (1D1); 3) Excavate the top of the U-shaped trench formed by the outer wall (1B) and the bottom plate (1C) from left to right, and fix the longitudinal beam (1A1) and the narrow top plate (1A2) into one piece in section by section. Fix the top of the inner side of the outer wall (1B) to the bottom of the top plate (1A) into one piece. Complete the construction of the top plate cross beam (1A3) from left to right one by one. 4) Excavate the soil and rock above the bottom plane of the middle plate (1E); 5) Complete the construction of the middle plate (1E); 6) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall (1B) and the base plate (1C); 7) Secure the horizontal sides of the base plate (1C) to the outer wall (1B) as a whole; 8) Continue subsequent work until the construction of the entire subway station (11) is completed.

9. A construction method for reserving core soil in ring excavation based on chain cutter excavation technology according to claim 8, characterized in that: The subway station (11) includes piles (11A), the base slab (1C) includes pile holes (1C1), and the middle slab (1E) includes an internal support frame (1E1) that does not affect the construction of the piles (11A). The construction of steps 5) to 8) in claim 6 includes the following main steps: 1) Complete the construction of the internal support frame (1E1); 2) Excavate all remaining soil and rock within the U-shaped trench formed by the outer wall (1B) and the base plate (1C); 3) Complete the construction of pile (11A); 4) Complete the construction of the middle plate (1E); 5) Continue subsequent work until the construction of the entire subway station (11) is completed.

10. A construction method for reserving core soil in ring excavation based on chain cutter excavation technology according to claim 8, characterized in that: The metro station (11) includes an orthogonal metro station (112) for two orthogonal metro lines.

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