Fabricated steel-concrete combined open caisson structure for pipe jacking underground excavation construction

Abstract

The utility model relates to an assembled steel-concrete combined open caisson structure for pipe jacking underground excavation construction, and belongs to the technical field of open caisson structures. Comprising a reinforced concrete open caisson and a steel structure detachably installed at the upper end of the reinforced concrete open caisson, main holes are formed in the four corners of the upper surface of the reinforced concrete open caisson, and placing grooves are formed in the main holes. According to the utility model, the lower ends of the fixing column and the main longitudinal beam in the steel structure are respectively inserted into the main hole and the auxiliary hole formed in the reinforced concrete open caisson, so that the connection between the steel structure and the reinforced concrete open caisson is more stable, and the anti-inclination capability of the fixing column and the main longitudinal beam is enhanced. Meanwhile, the first supporting cross beam frame and the second supporting cross beam frame are embedded in the inner side of the steel structure, inner side supporting force is provided for the steel structure, the steel structure is more stable, and the compression resistance and deformation resistance of the whole structure are improved. In addition, the steel structure is assembled in a modularized mode, and rapid disassembly and assembly on a construction site are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of caisson structures, in particular to an assembled steel-concrete combined caisson structure used for pipe jacking and dark excavation construction. Background Art

[0002] Pipe jacking and underground excavation is a construction method commonly used in underground pipeline construction. It is particularly suitable for urban underground pipeline projects and the laying of pipelines across obstacles such as rivers and roads. In pipe jacking construction, caissons, as important support and conduit facilities, play a vital role, especially in complex underground environments, to ensure the smooth progress of construction. At present, most existing caisson structures are made of reinforced concrete structures. After the subsequent pipe jacking and underground excavation construction is completed, they will be used as inspection wells and other facilities and will not be dismantled. This requires pouring a large amount of reinforced concrete when making the caisson structure. At the same time, there are many construction processes, which can easily lead to material waste and a long construction period. Secondly, the caisson cannot be dismantled after it is sunk into place. Generally, the caisson will be manufactured and installed in sections, and the caisson will be divided into two to three sections. The space of the lower caisson structure is sufficient to meet the needs of later maintenance, etc., while the upper caisson structure cannot be dismantled, which will lead to the inability to recycle materials and the large occupation of the upper underground space, which will affect the later urban underground space planning and cause waste of resources.

[0003] In response to these problems, the invention patent with publication number CN116607552A discloses a steel-concrete segmented combined caisson structure and its construction method, thereby making up for the shortcomings of traditional reinforced concrete caissons, achieving the purpose of fully utilizing the advantage of the caisson enclosure that can also serve as an inspection well structure, saving the use of reinforced concrete and reducing construction costs, and shortening the construction period of the working well.

[0004] However, the caisson structure disclosed in the above-mentioned invention patent still has certain problems. Its upper steel structure is simply spliced ​​with steel pipes and steel plates. This connection method has a great potential stability risk, and the overall structure has poor compressive and deformation resistance. In addition, the connection component structure between the steel pipe and the lower concrete shaft is relatively simple and weak, resulting in an unsatisfactory connection effect. Especially when the earth outside the caisson collapses, if the strength of the connection component is not enough, the steel pipe may tilt, deform or displace under the action of a large external force, thereby greatly reducing the containment effect of the entire caisson, resulting in a significant decrease in structural stability, and seriously affecting the stability and safety of the caisson. Utility Model Content

[0005] In order to solve the above technical problems, the present invention provides an assembled steel-concrete composite caisson structure for pipe jacking and underground excavation construction. The technical solution of the present invention is as follows:

[0006] A prefabricated steel-concrete composite caisson structure for pipe jacking and underground excavation construction includes a reinforced concrete caisson and a steel structure detachably mounted on the upper end of the reinforced concrete caisson. The upper surface of the reinforced concrete caisson is provided with main holes at four corners, and placement grooves are provided on the main holes. The upper surface of the reinforced concrete caisson is provided with multiple groups of auxiliary holes at equal distances on the four sides. An embedded steel plate frame is fixedly connected in the placement groove. The lower surface of the embedded steel plate frame is welded to the steel bars in the reinforced concrete caisson. The steel structure includes four groups of fixed columns, and the four groups of fixed columns respectively penetrate the embedded steel plate frames at corresponding positions. The fixing columns are fixed to the embedded steel plate frames at the corresponding positions by fixing parts. Multiple groups of main longitudinal beams are equidistantly arranged between each two adjacent groups of fixing columns. Multiple groups of main longitudinal beams are movably inserted into the secondary holes at the corresponding positions. Multiple groups of longitudinal beams are detachably fixedly connected to the outer sides of each two adjacent groups of main longitudinal beams with multiple groups of longitudinally stacked guard plates. The two transversely adjacent groups of guard plates are connected by connecting parts. The middle position on the inner side of the steel structure is detachably fixedly connected to a supporting crossbeam frame 1, and the upper end on the inner side of the steel structure is detachably fixedly connected to a supporting crossbeam frame 2.

[0007] Optionally, the embedded steel plate frame is fixedly connected with a threaded column at a right angle near the upper end opening of the reinforced concrete caisson, and the fixing part is an L-shaped plate, and a through hole 1 is opened through the transverse edge of the L-shaped plate, and the L-shaped plate is movably sleeved on the outside of the threaded column through the through hole 1, and a nut for fixing the L-shaped plate and the threaded column is provided on the outer thread of the threaded column, and a through hole 2 is opened through the longitudinal edge of the L-shaped plate, and a fixing bolt for fixing the L-shaped plate and the fixing column is connected to the inner thread of the through hole 2.

[0008] Optionally, the enclosure plate includes multiple groups of secondary beams, and slot seats 2 are symmetrically fixed at both ends of the multiple groups of secondary beams. The outer sides of the multiple groups of secondary beams and the two groups of slot seats 2 are fixedly connected with outer wall steel plates.

[0009] Optionally, a plurality of groups of ear plates are symmetrically fixed on both sides of the main longitudinal beam, and the ear plates are fixed to the secondary cross beams at corresponding positions by bolts.

[0010] Optionally, the connecting member adopts an I-shaped connecting seat 1, the left side of the I-shaped connecting seat 1 is movably inserted into the right side slot seat 2 located on the left side protective plate, and the right side of the I-shaped connecting seat 1 is movably inserted into the left side slot seat 2 located on the right side protective plate.

[0011] Optionally, the adjacent two side edges of the fixed column close to the upper end opening of the reinforced concrete caisson are fixedly connected with a slot seat 1, and the enclosure plate close to the fixed column is connected to the fixed column through an I-shaped connecting seat 2.

[0012] Optionally, two sets of inverted right-angle seats are fixedly connected to the side of the main longitudinal beam away from the guard plate. The inverted right-angle seat located at the bottom is used to provide a supporting force to the supporting crossbeam frame and the two are fixed by bolts. The inverted right-angle seat located at the top is used to provide a second supporting force to the supporting crossbeam frame and the two are fixed by bolts.

[0013] Optionally, the supporting beam frame 1 includes two groups of short beams 1 and two groups of long beams 1, the two groups of short beams 1 are respectively located on the front and rear sides of the interior of the steel structure, and the two groups of long beams 1 are respectively located on the left and right sides of the interior of the steel structure, both ends of the two groups of short beams 1 are abutted against the inner sides of the two groups of long beams 1, and the four inner corners of the supporting beam frame 1 are connected with diagonal bracing steel pipes 1 by bolts.

[0014] Optionally, the supporting beam frame 2 includes two groups of long beams 2 and two groups of short beams 2, the two groups of long beams 2 are respectively located on the front and rear sides of the interior of the steel structure, and the two groups of short beams 2 are respectively located on the left and right sides of the interior of the steel structure, both ends of the two groups of short beams 2 are abutted against the inner sides of the two groups of long beams 2, and the four inner corners of the supporting beam frame 2 are connected with diagonal bracing steel pipes 2 by bolts.

[0015] All the above optional technical solutions can be combined arbitrarily, and the present utility model does not provide detailed descriptions of the structures after the combinations.

[0016] By means of the above solution, the beneficial effects of the present invention are as follows:

[0017] 1. When constructing the caisson, the utility model uses reinforced concrete for the lower structure and steel for the upper structure, thereby reducing the amount of concrete used. Furthermore, the steel structure and the reinforced concrete caisson are detachable. After the caisson is constructed in layers, the upper steel structure can be disassembled and recycled, thus solving the problem of the upper structure being unable to be recycled after the caisson is constructed, which wastes resources.

[0018] 2. In this utility model, the lower ends of the fixed columns and the main longitudinal beams in the steel structure are respectively inserted into the main holes and the secondary holes opened on the reinforced concrete caisson. This will make the connection between the steel structure and the reinforced concrete caisson more stable, enhance the anti-tilting ability of the fixed columns and the main longitudinal beams, and ensure the stability of the overall structure. At the same time, the first supporting beam frame and the second supporting beam frame are embedded in the inner side of the steel structure to provide inner support for the steel structure, making the structure of the steel structure more stable, increasing the overall structure's compressive and deformation resistance, and being able to effectively withstand the pressure exerted on the steel structure by the earth outside the steel structure, thereby improving the stability and safety of the caisson. In addition, the steel structure itself adopts modular assembly, which is convenient for rapid disassembly and assembly at the construction site, reducing the complexity and time cost of construction. This modular design makes the transportation process simpler, greatly shortens the construction period, and improves construction efficiency.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall appearance of the assembled steel-concrete composite caisson structure for pipe jacking and underground excavation construction provided by the utility model;

[0021] Figure 2 A top view of the assembled steel-concrete composite caisson structure for pipe jacking and underground excavation construction provided by the present invention;

[0022] Figure 3 This is a front cross-sectional view of the assembled steel-concrete composite caisson structure for pipe jacking and underground excavation construction provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the exploded structure of the assembled steel-concrete composite caisson structure for pipe jacking and dark excavation construction provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the exploded structure of the reinforced concrete caisson, embedded steel plate frame, fixed columns, main longitudinal beams, enclosure plates, I-shaped connecting seat 1 and I-shaped connecting seat 2 in the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the reinforced concrete caisson, embedded steel plate frame and fixed column in the present invention;

[0026] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 8 for Figure 6 Schematic diagram of the enlarged structure at B in the middle;

[0028] Figure 9 This is a schematic structural diagram of the main longitudinal beam in the present utility model;

[0029] Figure 10 It is a schematic diagram of the exploded structure of the enclosure plate in the present utility model.

[0030] Numbers in the figure: 1. Reinforced concrete caisson; 11. Main hole; 111. Placement groove; 12. Auxiliary hole; 2. Embedded steel plate frame; 21. Threaded column; 3. Steel structure; 31. Fixed column; 311. Slot seat one; 32. Main longitudinal beam; 321. Ear plate; 322. Inverted right-angle seat; 33. Guard plate; 331. Secondary beam; 332. Slot seat two; 333. Outer wall steel plate; 34. I-shaped connecting seat one; 35. I-shaped connecting seat two; 4. L-shaped plate; 41. Through hole one; 42. Through hole two; 43. Nut; 44. Fixing bolt; 5. Support beam frame one; 51. Short beam one; 52. Long beam one; 53. Diagonal bracing steel pipe one; 6. Support beam frame two; 61. Long beam two; 62. Short beam two; 63. Diagonal bracing steel pipe two. DETAILED DESCRIPTION

[0031] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] See also Figure 1-10 The utility model provides an assembled steel-concrete composite caisson structure for pipe jacking and dark excavation construction, comprising a reinforced concrete caisson 1 and a steel structure 3 detachably mounted on the upper end of the reinforced concrete caisson 1. Main holes 11 are provided at the four corners of the upper surface of the reinforced concrete caisson 1. Placement grooves 111 are provided on the main holes 11. Multiple groups of auxiliary holes 12 are equidistantly provided on the four sides of the upper surface of the reinforced concrete caisson 1. An embedded steel plate frame 2 is fixedly connected in the placement grooves 111. The lower surface of the embedded steel plate frame 2 is welded to the steel bars in the reinforced concrete caisson 1. The steel structure 3 comprises four groups of fixing columns 31, which respectively penetrate the corresponding positions. The embedded steel plate frame 2 is detachably inserted into the main hole 11 at the corresponding position, and the fixed column 31 is fixed to the embedded steel plate frame 2 at the corresponding position by a fixing piece. Multiple groups of main longitudinal beams 32 are equidistantly arranged between each two adjacent groups of fixed columns 31. Multiple groups of main longitudinal beams 32 are movably inserted into the secondary holes 12 at the corresponding positions. The outer sides of each two adjacent groups of main longitudinal beams 32 are detachably fixedly connected with multiple groups of longitudinally stacked guard plates 33, and the two adjacent groups of guard plates 33 in the transverse direction are connected by connecting pieces. The middle position on the inner side of the steel structure 3 is detachably fixedly connected with a supporting crossbeam frame 1 5, and the upper end on the inner side of the steel structure 3 is detachably fixedly connected with a supporting crossbeam frame 2 6.

[0033] When making a caisson, the present invention adopts a reinforced concrete structure for the lower structure and a steel structure 3 for the upper structure, thereby reducing the amount of concrete used. At the same time, the steel structure 3 and the reinforced concrete caisson 1 are detachable structures. After the caisson is constructed in layers, the upper steel structure 3 can be disassembled and recycled, thereby solving the problem of the upper structure being unable to be recycled after the caisson construction is completed, which wastes resources. Secondly, in the present invention, the lower ends of the fixed columns 31 and the main longitudinal beams 32 in the steel structure 3 are respectively inserted into the main holes 11 and the secondary holes 12 opened on the reinforced concrete caisson 1. This makes the connection between the steel structure 3 and the reinforced concrete caisson 1 more stable, enhances the anti-tilting ability of the fixed columns 31 and the main longitudinal beams 32, and ensures the stability of the overall structure. At the same time, the supporting crossbeam frame 1 5 and the supporting crossbeam frame 2 6 are embedded in the inner side of the steel structure 3, providing inner support for the steel structure 3, making the structure of the steel structure 3 more stable, increasing the overall structure's resistance to pressure and deformation, and being able to effectively withstand the pressure exerted on the steel structure 3 by the earthwork outside the steel structure 3, thereby improving the stability and safety of the caisson. Furthermore, the steel structure 3 itself is assembled in modular form, allowing for quick assembly and disassembly at the construction site, reducing construction complexity and time costs. This modular design simplifies transportation, significantly shortens the construction period, and improves construction efficiency.

[0034] Preferably, the depth of the fixing column 31 inserted into the primary hole 11 should be no less than 1000mm, and the depth of the main longitudinal beam 32 inserted into the secondary hole 12 should also be no less than 1000mm to ensure structural stability and strength. Furthermore, the preferred spacing between two adjacent sets of main longitudinal beams 32 should be maintained at 1000mm to ensure a reasonable layout and load distribution of the overall structure and avoid structural imbalance or stress concentration.

[0035] Specifically, when making the reinforced concrete caisson 1, scaffolding is set up on the periphery, steel bars are tied, and formwork is installed. The main hole 11 and the secondary hole 12 are reserved at the top of the reinforced concrete caisson 1, and the embedded steel plate frame 2 is directly welded to the steel structure in the reinforced concrete caisson 1 at the upper end of the main hole 11, and finally the one-time pouring is completed.

[0036] Furthermore, the embedded steel plate frame 2 is fixedly connected with a threaded column 21 at a right angle near the upper end opening of the reinforced concrete caisson 1, and the fixing part is an L-shaped plate 4. A through hole 41 is opened through the transverse edge of the L-shaped plate 4, and the L-shaped plate 4 is movably sleeved on the outside of the threaded column 21 through the through hole 41. The outer thread of the threaded column 21 is sleeved with a nut 43 for fixing the L-shaped plate 4 and the threaded column 21, and a through hole 2 42 is opened through the longitudinal edge of the L-shaped plate 4. The through hole 2 42 is threadedly connected with a fixing bolt 44 for fixing the L-shaped plate 4 and the fixing column 31.

[0037] Specifically, after the fixing post 31 passes through the embedded steel plate frame 2 and is inserted into the main hole 11, it can be fixed using the L-shaped plate 4. Specifically, the L-shaped plate 4 is placed on the outside of the threaded post 21 through the first through hole 41. The nut 43 is then threaded onto the outside of the threaded post 21 so that it abuts the upper surface of the lateral edge of the L-shaped plate 4, thereby achieving relative fixation between the L-shaped plate 4 and the embedded steel plate frame 2. The fixing bolt 44 is then inserted into the second through hole 42 and fixed to the fixing post 31, thereby achieving relative fixation between the L-shaped plate 4 and the fixing post 31, and further securing the fixing post 31 to the embedded steel plate frame 2.

[0038] Furthermore, the enclosure plate 33 includes multiple groups of secondary beams 331 , and slot seats 332 are symmetrically fixed at both ends of the multiple groups of secondary beams 331 . The outer sides of the multiple groups of secondary beams 331 and the two groups of slot seats 332 are fixedly connected with outer wall steel plates 333 .

[0039] Specifically, after the enclosure panel 33 is secured to the main longitudinal beams 32, the multiple sets of secondary crossbeams 331 and the two sets of main longitudinal beams 32 form a grid-like structural layout. This grid structure not only effectively distributes the external pressure and forces acting on the outer wall steel plate 333, but also significantly improves the rigidity and deformation resistance of the entire enclosure panel 33.

[0040] Furthermore, a plurality of groups of ear plates 321 are symmetrically fixed on both sides of the main longitudinal beam 32 , and the ear plates 321 are fixed to the secondary cross beams 331 at corresponding positions by bolts.

[0041] Specifically, after the enclosure panels 33 are assembled, to ensure a secure connection between the main longitudinal beams 32 and the enclosure panels 33, construction workers can use bolts to secure the lugs 321 to the corresponding secondary crossbeams 331, thereby achieving relative fixation between the main longitudinal beams 32 and the enclosure panels 33. This structure effectively prevents the enclosure panels 33 from loosening or shifting due to external loads or vibrations, thereby enhancing the stability of the structure.

[0042] Furthermore, the connecting piece adopts an I-shaped connecting seat 1 34, the left side of the I-shaped connecting seat 1 34 is movably inserted into the right side slot seat 2 332 located on the left side protective plate 33, and the right side of the I-shaped connecting seat 1 34 is movably inserted into the left side slot seat 2 332 located on the right side protective plate 33, and the I-shaped connecting seat 1 34 and the slot seat 2 332 are fixed with bolts.

[0043] Specifically, when joining two sets of transverse enclosure panels 33, it is only necessary to fit the two sets of enclosure panels 33 together, and then insert the I-shaped connecting seat 1 34 into the corresponding slot seat 2 332 of the two sets of enclosure panels 33, thereby connecting the two sets of enclosure panels 33. Then, bolts are used to fix the slot seat 2 332 and the I-shaped connecting seat 1 34.

[0044] Furthermore, the adjacent two side edges of the fixed column 31 near the upper end opening of the reinforced concrete caisson 1 are fixedly connected with a slot seat 1 311, and the guard plate 33 near the fixed column 31 is connected to the fixed column 31 through an I-shaped connecting seat 2 35, and the I-shaped connecting seat 2 35 and the slot seat 1 311 are fixed with bolts.

[0045] Specifically, when connecting the fixing column 31 and the enclosure plate 33 , it is only necessary to insert the I-shaped connecting seat 2 35 into the slot seat 1 311 and the slot seat 2 332 at the corresponding positions, and then fix them with bolts.

[0046] Furthermore, two sets of inverted right-angle seats 322 are fixedly connected to one side of the main longitudinal beam 32 away from the guard plate 33. The inverted right-angle seat 322 located at the bottom is used to provide support force to the supporting crossbeam frame 1 5 and the two are fixed by bolts. The inverted right-angle seat 322 located at the top is used to provide support force to the supporting crossbeam frame 2 6 and the two are fixed by bolts.

[0047] Specifically, when installing the supporting crossbeam frame 1 5 and the supporting crossbeam frame 2 6 , it is only necessary to place them on the inverted right-angle seats 322 at the corresponding positions and then fix them with bolts.

[0048] Furthermore, the supporting crossbeam frame 5 includes two groups of short crossbeams 51 and two groups of long crossbeams 52. The two groups of short crossbeams 51 are respectively located at the front and rear sides of the interior of the steel structure 3, and the two groups of long crossbeams 52 are respectively located at the left and right sides of the interior of the steel structure 3. Both ends of the two groups of short crossbeams 51 are abutted against the inner sides of the two groups of long crossbeams 52. The four inner corners of the supporting crossbeam frame 5 are connected to the diagonal bracing steel pipe 53 by bolts.

[0049] Specifically, the two sets of short crossbeams 51 and the two sets of long crossbeams 52 form a stable frame structure. Because the two sets of short crossbeams 51 on the front and rear sides abut between the two sets of long crossbeams 52 on the left and right sides, the relative position between the two sets of long crossbeams 52 on the left and right sides is maintained, effectively preventing the steel structure 3 from tilting or collapsing due to lack of support. Furthermore, the diagonal bracing effect of the diagonal bracing steel pipes 53 further enhances the bending and torsional resistance of the supporting crossbeam frame 5.

[0050] Furthermore, the supporting crossbeam frame 26 includes two groups of long crossbeams 261 and two groups of short crossbeams 262. The two groups of long crossbeams 261 are respectively located on the front and rear sides of the interior of the steel structure 3, and the two groups of short crossbeams 262 are respectively located on the left and right sides of the interior of the steel structure 3. Both ends of the two groups of short crossbeams 262 are abutted against the inner sides of the two groups of long crossbeams 261. The four inner corners of the supporting crossbeam frame 26 are connected with diagonal bracing steel pipes 263 by bolts.

[0051] Specifically, because the two sets of short crossbeams 2 (62) on the left and right sides abut between the two sets of long crossbeams 2 (61) on the front and rear sides, the relative position between the two sets of long crossbeams 2 (61) on the front and rear sides does not decrease, thereby ensuring that the steel structure 3 on the front and rear sides is not easily displaced or collapsed under load, effectively preventing the risk of collapse of the steel structure 3. At the same time, the diagonal bracing effect of the diagonal bracing steel pipes 2 (63) further enhances the bending and torsion resistance of the supporting crossbeam frame 2 (6). Furthermore, by cooperating with the supporting crossbeam frame 1 (5), a mutually supporting and stable structure is formed, jointly ensuring the overall stability of the steel structure 3. Through the cooperation of the two, the steel structure 3 can maintain stability and balance when subjected to forces from different directions.

[0052] Working principle: The first step is to make a reinforced concrete caisson 1. After the strength of the reinforced concrete caisson 1 reaches 90%, the sinking operation is started. After sinking until the top is flush with the ground, the installation of the steel structure 3 is started. The second step is to insert the four groups of fixing columns 31 into the four groups of main holes 11 respectively, and fix them with L-shaped plates 4. The third step is to insert the main longitudinal beams 32 into the secondary holes 12 at the corresponding positions respectively. The fourth step is to splice the lower layer of protective panels 33 (the protective panels 33 can be divided into different longitudinal layers according to actual conditions, and only two groups are taken as an example in this technical solution). The protective panels 33 on the same side are spliced ​​together through the I-shaped connecting seat 1 34, and then the protective panels 33 close to the fixed columns 31 are spliced ​​with the fixed columns 31 through the I-shaped connecting seat 2 35. Then splice the upper layer of protective panels 33, and the splicing method is the same as that of the lower layer of protective panels 33. The fifth step is to use bolts to fix the ear plate 321 of the main longitudinal beam 32 and the enclosure plate 33. The sixth step is to install the supporting crossbeam frame 1 5 and the supporting crossbeam frame 2 6 at the inner middle position and the inner upper end position of the steel structure 3 respectively, and fix them with bolts. The seventh step is to carry out pipe jacking construction. After the construction is completed, the upper steel structure 3 will be dismantled and recycled for continued use, leaving only the reinforced concrete caisson 1 on the lower layer. Use prefabricated top plates and shafts to enclose the reinforced concrete caisson 1 structure on the lower layer, backfill the surrounding soil, and leave only the shaft leading to the ground.

[0053] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An assembled steel-concrete composite caisson structure for pipe jacking and underground excavation construction, characterized by: The invention comprises a reinforced concrete caisson (1) and a steel structure (3) detachably mounted on the upper end of the reinforced concrete caisson (1), wherein the upper surface of the reinforced concrete caisson (1) is provided with main holes (11) at four corners, and the main holes (11) are provided with placement grooves (111), and the upper surface of the reinforced concrete caisson (1) is provided with multiple groups of auxiliary holes (12) at equal intervals on four sides, and the placement grooves (111) are fixedly connected with embedded steel plate frames (2), and the lower surface of the embedded steel plate frames (2) is welded to the steel bars in the reinforced concrete caisson (1), and the steel structure (3) comprises four groups of fixed columns (31), and the four groups of fixed columns (31) respectively penetrate the embedded steel plate frames (2) at corresponding positions and are detachably plugged into the embedded steel plate frames (2). In the main holes (11) at the corresponding positions, the fixed columns (31) and the embedded steel plate frames (2) at the corresponding positions are fixed by fixing parts. Multiple groups of main longitudinal beams (32) are equidistantly arranged between each two adjacent groups of fixed columns (31). Multiple groups of main longitudinal beams (32) are movably inserted into the secondary holes (12) at the corresponding positions. Multiple groups of longitudinally stacked enclosure plates (33) are detachably fixedly connected to the outer sides of each two adjacent groups of main longitudinal beams (32). Two transversely adjacent groups of enclosure plates (33) are connected by connecting parts. A supporting crossbeam frame 1 (5) is detachably fixedly connected to the middle position of the inner side of the steel structure (3), and a supporting crossbeam frame 2 (6) is detachably fixedly connected to the upper end of the inner side of the steel structure (3).

2. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 1 is characterized in that: The embedded steel plate frame (2) is fixedly connected with a threaded column (21) at a right angle near the upper end opening of the reinforced concrete caisson (1), and the fixing member is an L-shaped plate (4). A through hole (41) is provided through the transverse edge of the L-shaped plate (4). The L-shaped plate (4) is movably sleeved on the outer side of the threaded column (21) through the through hole (41). A nut (43) for fixing the L-shaped plate (4) and the threaded column (21) is provided on the outer thread of the threaded column (21). A through hole (42) is provided through the longitudinal edge of the L-shaped plate (4). A fixing bolt (44) for fixing the L-shaped plate (4) and the fixing column (31) is connected to the inner thread of the through hole (42).

3. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 1 is characterized in that: The enclosure plate (33) includes multiple groups of secondary beams (331), and slot seats (332) are symmetrically fixed at both ends of the multiple groups of secondary beams (331). The outer sides of the multiple groups of secondary beams (331) and the two groups of slot seats (332) are fixedly connected with outer wall steel plates (333).

4. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 3 is characterized in that: A plurality of groups of ear plates (321) are symmetrically fixed on both sides of the main longitudinal beam (32), and the ear plates (321) are fixed to the secondary cross beams (331) at corresponding positions by means of bolts.

5. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 3 is characterized in that: The connecting member adopts an I-shaped connecting seat (34), the left side of the I-shaped connecting seat (34) is movably inserted into the right side slot seat (332) of the left side enclosure (33), and the right side of the I-shaped connecting seat (34) is movably inserted into the left side slot seat (332) of the right side enclosure (33).

6. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 1 is characterized in that: The adjacent two sides of the fixed column (31) close to the upper end opening of the reinforced concrete caisson (1) are fixedly connected with a slot seat (311), and the enclosure plate (33) close to the fixed column (31) is connected to the fixed column (31) through an I-shaped connecting seat (35).

7. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 1 is characterized in that: Two sets of inverted right-angle seats (322) are fixedly connected to one side of the main longitudinal beam (32) away from the enclosure plate (33). The inverted right-angle seat (322) located at the bottom is used to provide support force to the supporting crossbeam frame (5) and the two are fixed by bolts. The inverted right-angle seat (322) located at the top is used to provide support force to the supporting crossbeam frame (6) and the two are fixed by bolts.

8. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 7 is characterized in that: The supporting crossbeam frame (5) comprises two groups of short crossbeams (51) and two groups of long crossbeams (52). The two groups of short crossbeams (51) are respectively located at the front and rear sides of the interior of the steel structure (3), and the two groups of long crossbeams (52) are respectively located at the left and right sides of the interior of the steel structure (3). Both ends of the two groups of short crossbeams (51) are abutted against the inner sides of the two groups of long crossbeams (52). The four inner corners of the supporting crossbeam frame (5) are connected to the diagonal bracing steel pipe (53) by bolts.

9. The assembled steel-concrete combined caisson structure for pipe jacking and underground excavation construction according to claim 7 is characterized in that: The supporting crossbeam frame 2 (6) includes two groups of long crossbeams 2 (61) and two groups of short crossbeams 2 (62). The two groups of long crossbeams 2 (61) are respectively located at the front and rear sides of the interior of the steel structure (3), and the two groups of short crossbeams 2 (62) are respectively located at the left and right sides of the interior of the steel structure (3). Both ends of the two groups of short crossbeams 2 (62) are in contact with the inner sides of the two groups of long crossbeams 2 (61). The four inner corners of the supporting crossbeam frame 2 (6) are connected to the diagonal bracing steel pipes 2 (63) by bolts.

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