Super-large-diameter prefabricated hollow open caisson segment structure and construction method

Abstract

The invention belongs to the technical field of open caisson construction, and particularly relates to an ultra-large-diameter prefabricated hollow open caisson segment structure and a construction method.The open caisson segment structure comprises segment splicing components, the multiple segment splicing components are spliced into segment rings, hollow pouring areas are reserved on the segment splicing components, and the multiple segment rings are spliced into the open caisson segment structure; the segment assembling components comprise annular segment assembling components and rectangular segment assembling components, the rectangular segment assembling components comprise plate-shaped segment assembling components and right-angle segment assembling components, the prefabricated components are transversely spliced through steel bars at connectors, and the prefabricated components can be longitudinally spliced through the steel bars or can be hermetically spliced through positioning sheaths and sealing rubber; concrete is poured at the joint of steel bar connection, meanwhile, after prefabricated pipe piece components are connected, internal longitudinal holes and annular corrugated square holes can form staggered and through grouting areas, the grouting areas can be integrally formed, construction joints do not exist, the integrality is good, and therefore the integrality and completeness of the concrete-poured open caisson pipe piece are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of caisson construction, and specifically relates to an ultra-large diameter prefabricated hollow caisson segment structure and a construction method. Background Art

[0002] In modern infrastructure projects, the construction technology of ultra-large diameter and ultra-deep caissons has received more and more attention. Such projects usually involve deep foundation pit excavation, large underground structure construction, etc., which have extremely high requirements for construction technology. As a typical construction method for modern foundation pit construction, caisson construction is widely used in subways, rail transit, basement projects, water conservancy projects, construction projects and other fields.

[0003] Traditional caisson construction methods include on-site casting of whole-ring segments, assembly of prefabricated segments, and sinking of whole-ring segments in sections. However, for the construction of ultra-large diameter and ultra-deep caissons, it is extremely difficult to hoist whole-ring segments, so prefabricated segments are usually assembled on-site for construction. The prefabricated segments are assembled one by one to form an integral segment ring, and the segment rings are connected by bolts. Therefore, the entire construction process includes segment prefabrication, transportation, hoisting, assembly and other construction procedures. During the construction process, it is very easy to have engineering problems such as loose segment joints, segment leakage, and misalignment. Therefore, serious engineering problems such as segment leakage and excessive deformation are often caused. The quality of segment assembly is difficult to guarantee, the integrity of the caisson pipe wall is often poor, and the uneven deformation of the side wall of the caisson foundation pit is significant under soft formation conditions.

[0004] In addition, when the construction of ultra-large diameter and ultra-deep caissons adopts the method of casting the entire ring of segments on site in sections, the cast-in-place of the entire ring of segments requires a long hardening and curing time, and the pouring of large volumes of concrete is currently prone to concrete construction quality problems such as loose vibration, concrete cracking, loose pouring, and honeycombed surfaces due to the failure of construction technology and curing conditions to meet the requirements, which will seriously affect the progress of the ultra-large diameter sedimentation construction project. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-large diameter prefabricated hollow caisson segment structure and a construction method, aiming to improve the prefabrication and assembly process of ultra-large diameter caisson segments, improve the quality of caisson wall engineering, and provide a reference for caisson segment design and construction.

[0006] A super-large diameter prefabricated hollow caisson segment structure comprises segment assembling components, a plurality of segment assembling components are assembled into a segment ring, a hollow casting area is reserved on the segment assembling components, a plurality of segment rings are assembled into a caisson segment structure, the segment assembling components comprise annular segment assembling components and rectangular segment assembling components, and the rectangular segment assembling components comprise plate-shaped segment assembling components and right-angle segment assembling components.

[0007] A plurality of the plate-shaped segment assembling components are spliced ​​to form a rectangular segment, and the rectangular segment and the right-angle segment assembling components are assembled into a rectangular segment ring. Hollow casting areas are reserved in the plate-shaped segment assembling components and the right-angle segment assembling components respectively, and a plurality of rectangular segment rings are assembled into a rectangular caisson segment structure.

[0008] The annular segment assembly components and plate segment assembly components both include an inner panel and an outer panel. Inner longitudinal reinforcement, inner annular reinforcement, outer longitudinal reinforcement, outer annular reinforcement, longitudinal rib main reinforcement, longitudinal rib stirrups, end anchor reinforcement, end connecting reinforcement, and end main reinforcement are tied between the inner panel and the outer panel, and a hollow casting area is reserved. Concrete is cast between the inner panel and the outer panel except the hollow casting area to form an annular / plate segment assembly component. The hollow casting area includes transverse corrugated square holes and longitudinal holes that penetrate the annular / plate segment assembly component and are respectively arranged on the transverse end face and longitudinal end face of the annular / plate segment assembly component.

[0009] The right-angle joint segment assembly component includes an inner panel and an outer panel. Inner longitudinal reinforcement, inner annular reinforcement, outer longitudinal reinforcement, outer annular reinforcement, end anchor reinforcement, end connecting reinforcement, pin-jointed reinforcement, axilla reinforcement, and truss reinforcement are tied between the inner panel and the outer panel, and a hollow casting area is reserved to form a right-angle joint segment assembly component. The hollow area is the area enclosed by the inner panel and the outer panel.

[0010] Positioning sheaths and sealing rubbers are provided on the longitudinal end faces of the annular segment assembly components and the plate-shaped segment assembly components. The positioning sheaths are used to position and assemble two longitudinally connected annular segment assembly components or plate-shaped segment assembly components. The upper annular segment assembly component or plate-shaped segment assembly component is pressed against the sealing rubber for sealing with the lower annular segment assembly component or plate-shaped segment assembly component.

[0011] The longitudinal end faces of the annular segment assembly component and the plate segment assembly component are reserved with outer longitudinal rib joints, inner longitudinal rib joints and longitudinal rib main rib joints.

[0012] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a circular caisson segment structure, comprises the following steps:

[0013] Segment lifting and positioning

[0014] Use the segment hoisting machine to hoist the first annular segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment;

[0015] Annular segment annular joint connection

[0016] Hoist other annular segment assembly components, the end connection bars of every two annular segment assembly components are fixedly connected, the anchor bars at both ends are staggered, and the main bars at the ends are vertically distributed at the four corners of the anchor bars at both ends to form a whole, thereby forming an annular segment ring;

[0017] Annular segment ring longitudinal joint connection

[0018] The outer longitudinal reinforcement joints, the inner longitudinal reinforcement joints and the longitudinal rib main reinforcement joints reserved on the longitudinal end faces of the two annular segment assembly components are connected to each other, and longitudinal stirrups are added to constrain them, thereby completing the connection of the annular segment ring longitudinal joints;

[0019] Casting of joints and hollow casting areas

[0020] Install concrete casting templates at the annular joints and longitudinal joints of the annular segment ring, and use the method of multiple casting of the local segment ring, while splicing, casting operations are carried out on the joints and hollow casting areas, or complete the splicing of the entire ring of segments first, and then cast the joints and hollow casting areas uniformly;

[0021] Segment concrete curing and effect detection

[0022] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0023] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a circular caisson segment structure, comprises the following steps:

[0024] Segment lifting and positioning

[0025] Use the segment hoisting machine to hoist the first annular segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment;

[0026] Annular segment annular joint connection

[0027] Hoist other annular segment assembly components, the end connection bars of every two annular segment assembly components are fixedly connected, the anchor bars at both ends are staggered, and the main bars at the ends are vertically distributed at the four corners of the anchor bars at both ends to form a whole, thereby forming an annular segment ring;

[0028] Annular segment ring longitudinal joint connection

[0029] The hoisted annular segment assembly component is placed on the positioning sheath of the lower annular segment assembly component, and the annular segment assembly component is pressed against the sealing rubber to seal the two annular segment assembly components, and the two annular segment assembly components are connected by bolts, thereby completing the connection of the annular segment ring longitudinal joint;

[0030] Casting of joints and hollow casting areas

[0031] Install concrete pouring templates at the annular joints of the annular segment rings, and use the method of multiple pouring of the local segment rings, pouring operations on the joints and hollow pouring areas while splicing, or first complete the splicing of the entire ring of segments, and then uniformly pouring operations on the joints and hollow pouring areas;

[0032] Segment concrete curing and effect detection

[0033] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0034] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a rectangular caisson segment structure, comprises the following steps:

[0035] Segment lifting and positioning

[0036] Use the segment hoisting machine to hoist the first plate-shaped segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment;

[0037] Rectangular segment annular joint connection

[0038] Hoisting other plate-shaped segment assembly components, the end connecting ribs of the plate-shaped segment assembly components connect the outer annular ribs and the inner annular ribs of the plate-shaped segment assembly components, and at the same time, the end anchoring ribs of the two plate-shaped segment assembly components are fixedly connected, and the end main ribs are vertically distributed at the four corners of the two end anchoring ribs to form a whole, thereby forming a rectangular segment;

[0039] The end connecting ribs of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring;

[0040] Rectangular segment ring longitudinal joint connection

[0041] The outer longitudinal reinforcement joints, the inner longitudinal reinforcement joints and the longitudinal rib main reinforcement joints reserved on the longitudinal end faces of the two plate-shaped segment assembly components are connected to each other, and longitudinal stirrups are added to constrain them, thereby completing the connection of the longitudinal joints of the rectangular segment ring;

[0042] Casting of joints and hollow casting areas

[0043] Install concrete casting templates at the annular joints and longitudinal joints of the rectangular segment ring respectively, and adopt the method of multiple casting of the local segment ring, while splicing, cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components, or complete the splicing of the entire ring of segments first, and then uniformly cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components;

[0044] Segment concrete curing and effect detection

[0045] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0046] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a rectangular caisson segment structure, comprises the following steps:

[0047] Segment lifting and positioning

[0048] Use the segment hoisting machine to hoist the first plate-shaped segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment;

[0049] Rectangular segment annular joint connection

[0050] Hoisting other plate-shaped segment assembly components, the end connecting ribs of the plate-shaped segment assembly components connect the outer annular ribs and the inner annular ribs of the plate-shaped segment assembly components, and the end anchoring ribs fix the two plate-shaped segment assembly components together, and the end main ribs are vertically distributed at the four corners of the two end anchoring ribs to form a whole, thereby forming a rectangular segment;

[0051] The end connecting ribs of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring;

[0052] Rectangular segment ring longitudinal joint connection

[0053] The hoisted plate-shaped segment assembly component is placed on the positioning sheath of the plate-shaped segment assembly component below, and the plate-shaped segment assembly component is pressed on the sealing rubber to seal the two plate-shaped segment assembly components, and the two plate-shaped segment assembly components are connected by bolts, thereby completing the connection of the longitudinal joint of the rectangular segment ring;

[0054] Casting of joints and hollow casting areas

[0055] Install concrete pouring templates at the annular joint connection of the rectangular segment ring, and adopt the method of multiple pouring of the local segment ring, pouring operations on the hollow pouring areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components while splicing, or complete the splicing of the entire ring of segments first, and then uniformly pour the hollow pouring operations on the joints, plate-shaped segment assembly components, and right-angle segment assembly components;

[0056] Segment concrete curing and effect detection

[0057] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. The cross-sectional dimensions and reinforcement of the different types of segment assembly structures shown in the present invention can be uniformly designed and produced. The cross-sectional dimensions of the segment assembly components and the positions of the embedded parts are strictly controlled during the production process. The inner and outer panels of the segment assembly components serve as templates for later on-site concrete casting. The panels have a good appearance and do not require later plastering treatment. The overall quality is controllable, the production precision is high and the cost is low, and the later maintenance cost can be effectively reduced.

[0060] 2. The prefabricated assembly component design and production process of the present invention are put in advance. Before construction excavation, the production of segment assembly components can meet the engineering requirements; at the same time, the main body of the segment structure is produced in the factory, and most of the structural steel bars have been tied and formed. Only a small amount of steel bars need to be tied on site, which greatly reduces the construction period and ensures the construction progress and the quality of the construction environment.

[0061] 3. The large hollow structure inside the assembled components is used as the later concrete pouring area, which greatly reduces the weight of the prefabricated segment structure and facilitates the transportation, lifting and assembly of the segments. At the same time, the inner and outer panels of the prefabricated components are used as concrete pouring templates, and the number of on-site pouring templates is significantly reduced compared to cast-in-place. Only a small amount of concrete pouring templates need to be added at the joints of the prefabricated components on site, which reduces the number of on-site workers and optimizes the on-site construction environment.

[0062] 4. The splicing of prefabricated components begins with welding of steel bars at the interfaces, and then pouring of concrete at the interfaces. At the same time, after the prefabricated segment components are connected, the internal longitudinal holes and the circumferential corrugated square holes can form staggered and interpenetrating grouting areas. The grouting areas can be formed in one piece, without construction joints, and have good integrity, thereby ensuring the integrity and integrity of the poured concrete caisson segments, effectively overcoming the construction quality problems such as water leakage and stress concentration caused by the traditional prefabricated caisson segment construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a schematic diagram of the annular segment assembly component of the present invention;

[0064] Figure 2 It is a schematic diagram of the plate-shaped segment assembly component of the present invention;

[0065] Figure 3 It is a schematic diagram of a right-angle segment assembly component of the present invention;

[0066] Figure 4 It is a schematic diagram of the annular joint connection of the annular segment ring of the present invention;

[0067] Figure 5 It is a schematic diagram of the annular joint connection of the plate-shaped tube segment annulus of the present invention;

[0068] Figure 6 It is a longitudinal cross-sectional schematic diagram of the annular / plate-shaped segment assembly component of the present invention;

[0069] Figure 7 It is a schematic diagram of a vertical joint of the annular / plate-shaped segment assembly component of the present invention connected by a positioning sheath;

[0070] Figure 8 It is a schematic diagram of a vertical joint of the annular / plate-shaped segment assembly component of the present invention connected by steel bars;

[0071] Fig. 9 The overall assembly effect of the circular pipe segment with an extra-large diameter caisson pipe segment of the present invention;

[0072] In the attached drawings: 1. Annular segment assembly components; 2. Plate segment assembly components; 3. Right-angle segment assembly components; 4. Hollow casting area; 5. Corrugated square hole; 6. Longitudinal hole; 7. Inner panel; 8. Outer panel; 9. Inner longitudinal reinforcement; 10. Inner annular reinforcement; 11. Outer longitudinal reinforcement; 12. Outer annular reinforcement; 13. Longitudinal rib main reinforcement; 14. Longitudinal rib stirrups; 15. End anchor reinforcement; 16. End connecting reinforcement; 17. End main reinforcement; 18. Pinned reinforcement; 19. Axillary angle reinforcement; 20. Truss reinforcement; 21. Positioning sheath; 22. Outer longitudinal reinforcement joint; 23. Longitudinal rib main reinforcement joint. DETAILED DESCRIPTION

[0073] The present invention is described in detail below with reference to the accompanying drawings.

[0074] like Figures 1 to 9As shown, the present invention is an advanced caisson segment construction technology and method that can be easily produced, quickly hoisted, quickly assembled, and quickly constructed, while ensuring the integrity, sealing and mechanical properties of the entire ring of segments, which is of great significance to the construction of ultra-large diameter and ultra-deep caissons. The present invention aims to provide a prefabricated hollow casting component and construction method for ultra-large diameter caisson segments, aiming to improve the prefabrication and assembly process of ultra-large diameter caisson segments, improve the quality of caisson wall engineering, and provide a reference for caisson segment design and construction.

[0075] Example 1

[0076] like Figure 1 , 4 As shown in Figures 6, 8 and 9, an extra-large diameter prefabricated hollow caisson segment structure comprises an annular segment assembly component 1. A plurality of annular segment assembly components 1 are assembled into an annular segment ring. The annular segment assembly component 1 is provided with a hollow casting area 4. The hollow casting area 4 comprises transverse corrugated square holes 5 and longitudinal holes 6 which are respectively arranged on the transverse end face and the longitudinal end face of the annular segment assembly component 1 and penetrate the annular segment assembly component 1. A plurality of annular segment rings are assembled into a circular caisson segment structure. In this embodiment, three longitudinal holes 6 are provided and two transverse corrugated square holes 5 are provided, which are evenly distributed on the annular segment assembly component 1.

[0077] The annular segment assembly component 1 includes an inner panel 7 and an outer panel 8. Inner longitudinal reinforcement 9, inner annular reinforcement 10, outer longitudinal reinforcement 11, outer annular reinforcement 12, longitudinal rib main reinforcement 13, longitudinal rib stirrups 14, end anchor reinforcement 15, end connecting reinforcement 16, and end main reinforcement 17 are tied between the inner panel 7 and the outer panel 8, and a hollow casting area 4 is reserved. Concrete is cast between the inner panel 7 and the outer panel 8 except the hollow casting area 4 to form an annular segment assembly component 1, wherein the outer panel and the outer panel are precast cast concrete.

[0078] An outer longitudinal rib joint 22 , an inner longitudinal rib joint and a longitudinal rib main rib joint 23 are reserved on the longitudinal end surface of the annular segment assembly component 1 .

[0079] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a circular caisson segment structure, comprises the following steps:

[0080] Segment lifting and positioning

[0081] Usually, the first ring of caisson segments can be constructed by sinking the entire ring of segments. According to the construction organization design, the first annular segment assembly component 1 is hoisted to the designated position by a segment hoisting machine and is longitudinally positioned and connected with the first ring of segments. After the segment assembly component is installed by on-site hoisting equipment, the adjacent segment assembly components are also positioned and hoisted by hoisting operations, and then the annular splicing and longitudinal splicing are completed.

[0082] Annular segment annular joint connection

[0083] The circumferential splicing is performed by butt welding the end connecting bars to connect the steel bars; hoisting other annular segment assembly components 1, an inward recessed area is provided on the transverse end surface of the annular segment assembly component 1, which is used for the steel bar connection operation and the concrete pouring of the connection area of ​​the annular segment assembly component, the end connecting bars 16 of every two annular segment assembly components 1 are fixedly connected, the anchor bars 15 at the two ends are staggered and connected by lap welding, and the end main bars 17 are vertically distributed at the four corners of the anchor bars 15 at the two ends to form a whole, thereby forming an annular segment ring;

[0084] Annular segment ring longitudinal joint connection

[0085] For caisson projects with relatively high requirements for longitudinal stiffness, the outer longitudinal reinforcement joints 22, inner longitudinal reinforcement joints and longitudinal rib main reinforcement joints 23 reserved on the longitudinal end faces of the two annular segment assembly components 1 are connected to each other, and longitudinal stirrups are added for constraint. A recessed area is reserved at the longitudinal joint for the steel bar connection operation and the concrete pouring of the connection area of ​​the annular segment assembly component, thereby completing the connection of the annular segment ring longitudinal joints;

[0086] Casting of joints and hollow casting areas

[0087] After the longitudinal and circumferential connections are all welded, concrete pouring templates are installed at the joints of the inner and outer panels of the segments, and concrete pouring can be carried out on the newly installed segments;

[0088] Install concrete casting templates at the annular joints and longitudinal joints of the annular segment ring, and use the method of multiple casting of the local segment ring, while splicing, casting operations are carried out on the joints and hollow casting areas, or complete the splicing of the entire ring of segments first, and then cast the joints and hollow casting areas uniformly;

[0089] Because the longitudinal holes 6 and the horizontal corrugated square holes 5 are distributed in the same ring segment, the concrete pouring area is internally connected, so the concrete pouring inside one or more ring segments can be completed at the same time, and the number of concrete pouring ports and the pouring speed can be determined according to the engineering conditions (caisson size and concrete type).

[0090] Segment concrete curing and effect detection

[0091] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0092] Example 2

[0093] like Figure 1 ,4 As shown in , 6 to 7 and 9, the extra-large diameter prefabricated hollow caisson segment structure of this embodiment is different from the structure of embodiment 1 in that a positioning sheath 21 and a sealing rubber are provided on the longitudinal end face of the annular segment assembly component 1, and the positioning sheath 21 and the sealing rubber are placed at intervals. The positioning sheath 21 is used for positioning and assembling two longitudinally connected annular segment assembly components, and a groove is provided on the longitudinal end face of the annular segment assembly component where the sealing rubber is placed, and the sealing rubber is placed in the groove, and the annular segment assembly component located above presses the sealing rubber in the groove for sealing with the annular segment assembly component below.

[0094] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a circular caisson segment structure, comprises the following steps:

[0095] Segment lifting and positioning

[0096] Usually, the first ring of caisson segments can be constructed by sinking the entire ring of segments. According to the construction organization design, the first annular segment assembly component 1 is hoisted to the designated position by a segment hoisting machine and is longitudinally positioned and connected with the first ring of segments. After the segment assembly component is installed by on-site hoisting equipment, the adjacent segment assembly components are also positioned and hoisted by hoisting operations, and then the annular splicing and longitudinal splicing are completed.

[0097] Annular segment annular joint connection

[0098] The circumferential splicing is performed by butt welding the end connecting ribs to connect the steel bars; when hoisting other annular segment assembly components, an inward recessed area is provided on the transverse end surface of the annular segment assembly component 1 for the steel bar connection operation and the concrete pouring in the connection area of ​​the annular segment assembly component. The end connecting ribs 16 of every two annular segment assembly components 1 are fixedly connected, and the anchoring ribs 15 at the two ends are staggered and connected by lap welding. The end main ribs 17 are vertically distributed at the four corners of the anchoring ribs 15 at the two ends to form a whole, thereby forming an annular segment ring;

[0099] Annular segment ring longitudinal joint connection

[0100] The hoisted annular segment assembly component 1 is placed on the positioning sheath 21 of the lower annular segment assembly component 1, and the annular segment assembly component 1 is pressed against the sealing rubber to seal the two annular segment assembly components, and the two annular segment assembly components are connected by bolts, thereby completing the connection of the annular segment ring longitudinal joint;

[0101] Casting of joints and hollow casting areas

[0102] Install concrete pouring templates at the annular joints of the annular segment rings, and use the method of multiple pouring of the local segment rings, pouring operations on the joints and hollow pouring areas while splicing, or first complete the splicing of the entire ring of segments, and then uniformly pouring operations on the joints and hollow pouring areas;

[0103] Segment concrete curing and effect detection

[0104] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0105] Example 3

[0106] like Figures 2-3 As shown in , 5 to 6, and 8, an extra-large diameter prefabricated hollow caisson segment structure includes a plate-shaped segment assembly component 2 and a right-angle segment assembly component 3. A plurality of plate-shaped segment assembly components 2 are spliced ​​to form a rectangular segment. The rectangular segment and the right-angle segment assembly components 3 are assembled into a rectangular segment ring. Hollow casting areas 4 are reserved in the plate-shaped segment assembly components 2 and the right-angle segment assembly components 3 respectively. A plurality of rectangular segment rings are assembled into a rectangular caisson segment structure.

[0107] The plate-shaped segment assembly component 2 includes an inner panel 7 and an outer panel 8. The inner longitudinal ribs 9, the inner annular ribs 10, the outer longitudinal ribs 11, the outer annular ribs 12, the longitudinal rib main ribs 13, the longitudinal rib stirrups 14, the end anchoring ribs 15, the end connecting ribs 16, and the end main ribs are tied between the inner panel 7 and the outer panel 8. A hollow casting area 4 is reserved. Concrete is cast in the area between the inner panel 7 and the outer panel 8 except the hollow casting area 4 to form a plate-shaped segment assembly component, wherein the outer panel and the outer panel are prefabricated molded concrete; the hollow casting area 4 includes transverse corrugated square holes 5 and longitudinal holes 6 respectively arranged on the transverse end face and the longitudinal end face of the plate-shaped segment assembly component 2 and penetrating the plate-shaped segment assembly component 2. In this embodiment, two transverse corrugated square holes 5 and two longitudinal holes 6 are provided;

[0108] The right-angle joint segment assembly component 3 includes an inner panel 7 and an outer panel 8. Inner longitudinal reinforcement 9, inner annular reinforcement 10, outer longitudinal reinforcement 11, outer annular reinforcement 12, end anchor reinforcement 15, end connecting reinforcement 16, pin reinforcement 18, axilla reinforcement 19, and truss reinforcement 20 are tied between the inner panel 7 and the outer panel 8, and a hollow casting area 4 is reserved to form a right-angle joint segment assembly component 3. The hollow area is the area enclosed by the inner panel 7 and the outer panel 8.

[0109] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a rectangular caisson segment structure, comprises the following steps:

[0110] Segment lifting and positioning

[0111] Usually, the first ring of caisson segments can be constructed by sinking the entire ring of segments. According to the construction organization design, the first plate-shaped segment assembly component is hoisted to the designated position by a segment hoisting machine and the first ring of segments is longitudinally positioned and connected.

[0112] Rectangular segment annular joint connection

[0113] Hoisting other plate-shaped segment assembling components 2, the transverse end surface of the plate-shaped segment assembling component 2 is provided with an inward recessed area for the steel bar connection operation and the concrete pouring of the connection area of ​​the plate-shaped segment assembling component 2, the end connecting ribs 16 of the plate-shaped segment assembling component 2 connect the outer annular ribs 12 and the inner annular ribs 10 of the plate-shaped segment assembling component 2, and at the same time, the end anchoring ribs 15 of the two plate-shaped segment assembling components 2 are fixedly connected, and the end main ribs 17 are vertically distributed at the four corners of the two end anchoring ribs 15 to form a whole, thereby forming a rectangular segment;

[0114] The end connecting ribs 16 of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring;

[0115] Rectangular segment ring longitudinal joint connection

[0116] The outer longitudinal reinforcement joints 22, the inner longitudinal reinforcement joints and the longitudinal rib main reinforcement joints 23 reserved on the longitudinal end faces of the two plate-shaped segment assembly components 2 are connected to each other, and longitudinal stirrups are added for constraint. A recessed area is reserved at the longitudinal joint for the steel bar connection operation and the concrete pouring in the connection area of ​​the plate-shaped segment assembly component, thereby completing the connection of the rectangular segment ring longitudinal joints;

[0117] Casting of joints and hollow casting areas

[0118] Install concrete casting templates at the annular joints and longitudinal joints of the rectangular segment ring respectively, and adopt the method of multiple casting of the local segment ring, while splicing, cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components, or complete the splicing of the entire ring of segments first, and then uniformly cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components;

[0119] Because the longitudinal holes 6 and the horizontal corrugated square holes 5 are distributed in the same ring segment, the concrete pouring area is connected internally, so the concrete pouring inside one or more ring segments can be completed at the same time, and the number of concrete pouring ports and the pouring speed can be determined according to the engineering conditions (caisson size and concrete type);

[0120] Segment concrete curing and effect detection

[0121] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0122] Example 4

[0123] like Figures 2-3 As shown in , 5 to 6 and 7, the extra-large diameter prefabricated hollow caisson segment structure of this embodiment differs from the structure of embodiment 3 in that a positioning sheath 21 and a sealing rubber are provided on the longitudinal end face of the plate-shaped segment assembly component 2, and the positioning sheath 21 is used for positioning and assembling two longitudinally connected plate-shaped segment assembly components 2, and the upper plate-shaped segment assembly component 2 is pressed against the sealing rubber for sealing with the lower plate-shaped segment assembly component.

[0124] A construction method for an ultra-large diameter prefabricated hollow caisson segment structure, used for the construction of a rectangular caisson segment structure, comprises the following steps:

[0125] Segment lifting and positioning

[0126] Usually, the first ring of caisson segments can be constructed by sinking the entire ring of segments. According to the construction organization design, the first plate-shaped segment assembly component is hoisted to the designated position by a segment hoisting machine and the first ring of segments is longitudinally positioned and connected.

[0127] Rectangular segment annular joint connection

[0128] When hoisting other annular segment assembling components, an inwardly facing recessed area is provided on the transverse end surface of the plate-shaped segment assembling component 2 for the steel bar connection operation and the concrete pouring in the connection area of ​​the plate-shaped segment assembling component 2. The end connecting ribs 16 of the plate-shaped segment assembling component 2 connect the outer annular ribs 12 and the inner annular ribs 10 of the plate-shaped segment assembling component 2. At the same time, the end anchoring ribs 15 of the two plate-shaped segment assembling components 2 are fixedly connected, and the end main ribs 17 are vertically distributed at the four corners of the two end anchoring ribs 15 to form a whole, thereby forming a rectangular segment;

[0129] The end connecting ribs of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring;

[0130] Rectangular segment ring longitudinal joint connection

[0131] The plate-shaped segment assembly component 2 is hoisted and placed on the positioning sheath 21 of the plate-shaped segment assembly component 2 below, and the plate-shaped segment assembly component 2 is pressed against the sealing rubber to seal the two plate-shaped segment assembly components 2, and the two plate-shaped segment assembly components 2 are connected by bolts, thereby completing the connection of the rectangular segment ring longitudinal joint;

[0132] Casting of joints and hollow casting areas

[0133] Install concrete pouring templates at the annular joints of the rectangular segment ring, and adopt a method of multiple pouring of the local segment ring, while splicing, pouring operations are carried out on the hollow pouring areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components, or complete the splicing of the entire ring of segments first, and then uniformly pouring operations are carried out on the hollow pouring areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components;

[0134] Because the longitudinal holes 6 and the horizontal corrugated square holes 5 are distributed in the same ring segment, the concrete pouring area is connected internally, so the concrete pouring inside one or more ring segments can be completed at the same time, and the number of concrete pouring ports and the pouring speed can be determined according to the engineering conditions (caisson size and concrete type);

[0135] Segment concrete curing and effect detection

[0136] After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

[0137] By analyzing Examples 1 to 4, Example 1 and Example 2, Example 3 and Example 4, the transverse joint connection method of the annular segment rings of these two groups of examples is the same, the longitudinal joint can be positioned by the positioning sheath 21 on the top of the segment and tightly connected under the action of deadweight, or it can be connected by welding the end longitudinal reinforcements, and at the same time, longitudinal stirrups are added to form a whole longitudinal rib main reinforcement; at this time, when the positioning sheath is used for positioning connection during concrete pouring, concrete does not need to be poured at the connection;

[0138] The pouring time of concrete can be selected according to the needs of the project. After the two segment assembly components are assembled, the concrete can be poured into the inward recessed area on the transverse end surface of the segment assembly component by a pouring machine, and the concrete can be filled into the hollow pouring area at the same time; or after the installation of the entire ring of segments is completed, concrete can be poured at the annular joints and longitudinal joints, and it can also be poured directly through the hollow pouring area according to needs, thereby producing the entire segment ring.

[0139] The reserved hollow casting area of ​​the present application not only reduces the overall mass of the segment and facilitates lifting, but also forms an integrated structure with the concrete casting at the segment connection, without construction joints, with good integrity, thus solving the water leakage problem at the segment connection.

[0140] Through the construction method of the caisson segment structure, the production, transportation, hoisting and construction and maintenance operations of ultra-large diameter and ultra-deep sinking segments can be completed efficiently and quickly, effectively improving construction efficiency and reducing construction risks on the basis of reducing construction costs and shortening construction periods.

Claims

1. An ultra-large diameter prefabricated hollow caisson segment structure, characterized in that: It includes segment assembly components, multiple segment assembly components are assembled into segment rings, hollow casting areas are reserved on the segment assembly components, multiple segment rings are assembled into caisson segment structures, the segment assembly components include annular segment assembly components and rectangular segment assembly components, and the rectangular segment assembly components include plate segment assembly components and right-angle segment assembly components.

2. The ultra-large diameter prefabricated hollow caisson segment structure according to claim 1 is characterized in that: A plurality of the plate-shaped segment assembling components are spliced ​​to form a rectangular segment, and the rectangular segment and the right-angle segment assembling components are assembled into a rectangular segment ring. Hollow casting areas are reserved in the plate-shaped segment assembling components and the right-angle segment assembling components respectively, and a plurality of rectangular segment rings are assembled into a rectangular caisson segment structure.

3. The ultra-large diameter prefabricated hollow caisson segment structure according to claim 2 is characterized in that: The annular segment assembly components and plate segment assembly components both include an inner panel and an outer panel. Inner longitudinal reinforcement, inner annular reinforcement, outer longitudinal reinforcement, outer annular reinforcement, longitudinal rib main reinforcement, longitudinal rib stirrups, end anchor reinforcement, end connecting reinforcement, and end main reinforcement are tied between the inner panel and the outer panel, and a hollow casting area is reserved. Concrete is cast between the inner panel and the outer panel except the hollow casting area to form an annular / plate segment assembly component. The hollow casting area includes transverse corrugated square holes and longitudinal holes that penetrate the annular / plate segment assembly component and are respectively arranged on the transverse end face and longitudinal end face of the annular / plate segment assembly component.

4. The super-large diameter prefabricated hollow caisson segment structure according to claim 3 is characterized in that: The right-angle joint segment assembly component includes an inner panel and an outer panel. Inner longitudinal reinforcement, inner annular reinforcement, outer longitudinal reinforcement, outer annular reinforcement, end anchor reinforcement, end connecting reinforcement, pin-jointed reinforcement, axilla reinforcement, and truss reinforcement are tied between the inner panel and the outer panel, and a hollow casting area is reserved to form a right-angle joint segment assembly component. The hollow area is the area enclosed by the inner panel and the outer panel.

5. The ultra-large diameter prefabricated hollow caisson segment structure according to claim 4, characterized in that: Positioning sheaths and sealing rubbers are provided on the longitudinal end faces of the annular segment assembly components and the plate-type segment assembly components. The positioning sheaths are used to position and assemble two longitudinally connected annular segment assembly components or plate-type segment assembly components. The upper annular segment assembly component or plate-type segment assembly component is pressed against the sealing rubber for sealing with the lower annular segment assembly component or plate-type segment assembly component. When the segment assembly component is rectangular, the positioning sheath and the sealing rubber are arranged on the plate-type segment assembly component.

6. The ultra-large diameter prefabricated hollow caisson segment structure according to claim 4, characterized in that: The longitudinal end faces of the annular segment assembly component and the plate segment assembly component are reserved with outer longitudinal rib joints, inner longitudinal rib joints and longitudinal rib main rib joints.

7. A construction method for a super-large diameter prefabricated hollow caisson segment structure, according to the caisson segment structure of claim 6, characterized in that: The following steps are involved: Segment lifting and positioning Use the segment hoisting machine to hoist the first annular segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment; Annular segment annular joint connection Hoist other annular segment assembly components, the end connection bars of every two annular segment assembly components are fixedly connected, the anchor bars at both ends are staggered, and the main bars at the ends are vertically distributed at the four corners of the anchor bars at both ends to form a whole, thereby forming an annular segment ring; Annular segment ring longitudinal joint connection The outer longitudinal reinforcement joints, the inner longitudinal reinforcement joints and the longitudinal rib main reinforcement joints reserved on the longitudinal end faces of the two annular segment assembly components are connected to each other, and longitudinal stirrups are added to constrain them, thereby completing the connection of the annular segment ring longitudinal joints; Casting of joints and hollow casting areas Install concrete casting templates at the annular joints and longitudinal joints of the annular segment ring, and use the method of multiple casting of the local segment ring, while splicing, casting operations are carried out on the joints and hollow casting areas, or complete the splicing of the entire ring of segments first, and then cast the joints and hollow casting areas uniformly; Segment concrete curing and effect detection After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

8. A construction method for a super-large diameter prefabricated hollow caisson segment structure, according to the caisson segment structure of claim 5, characterized in that: The following steps are involved: Segment lifting and positioning Use the segment hoisting machine to hoist the first annular segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment; Annular segment annular joint connection Hoist other annular segment assembly components, the end connection bars of every two annular segment assembly components are fixedly connected, the anchor bars at both ends are staggered, and the main bars at the ends are vertically distributed at the four corners of the anchor bars at both ends to form a whole, thereby forming an annular segment ring; Annular segment ring longitudinal joint connection The hoisted annular segment assembly component is placed on the positioning sheath of the lower annular segment assembly component, and the annular segment assembly component is pressed against the sealing rubber to seal the two annular segment assembly components, and the two annular segment assembly components are connected by bolts, thereby completing the connection of the annular segment ring longitudinal joint; Casting of joints and hollow casting areas Install concrete pouring templates at the annular joints of the annular segment rings, and use the method of multiple pouring of the local segment rings, pouring operations on the joints and hollow pouring areas while splicing, or first complete the splicing of the entire ring of segments, and then uniformly pouring operations on the joints and hollow pouring areas; Segment concrete curing and effect detection After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

9. A construction method for a super-large diameter prefabricated hollow caisson segment structure, according to the caisson segment structure of claim 6, characterized in that: The following steps are involved: Segment lifting and positioning Use the segment hoisting machine to hoist the first plate-shaped segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment; Rectangular segment annular joint connection Hoisting other plate-shaped segment assembly components, the end connecting ribs of the plate-shaped segment assembly components connect the outer annular ribs and the inner annular ribs of the plate-shaped segment assembly components, and at the same time, the end anchoring ribs of the two plate-shaped segment assembly components are fixedly connected, and the end main ribs are vertically distributed at the four corners of the two end anchoring ribs to form a whole, thereby forming a rectangular segment; The end connecting ribs of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring; Rectangular segment ring longitudinal joint connection The outer longitudinal reinforcement joints, the inner longitudinal reinforcement joints and the longitudinal rib main reinforcement joints reserved on the longitudinal end faces of the two plate-shaped segment assembly components are connected to each other, and longitudinal stirrups are added to constrain them, thereby completing the connection of the longitudinal joints of the rectangular segment ring; Casting of joints and hollow casting areas Install concrete casting templates at the annular joints and longitudinal joints of the rectangular segment ring respectively, and adopt the method of multiple casting of the local segment ring, while splicing, cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components, or complete the splicing of the entire ring of segments first, and then uniformly cast the hollow casting areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components; Segment concrete curing and effect detection After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

10. A construction method for a super-large diameter prefabricated hollow caisson segment structure, according to the caisson segment structure of claim 5, characterized in that: The following steps are involved: Segment lifting and positioning Use the segment hoisting machine to hoist the first plate-shaped segment assembly component to the designated location and complete the longitudinal positioning and connection with the first ring segment; Rectangular segment annular joint connection Hoisting other plate-shaped segment assembly components, the end connecting ribs of the plate-shaped segment assembly components connect the outer annular ribs and the inner annular ribs of the plate-shaped segment assembly components, and the end anchoring ribs fix the two plate-shaped segment assembly components together, and the end main ribs are vertically distributed at the four corners of the two end anchoring ribs to form a whole, thereby forming a rectangular segment; The end connecting ribs of the rectangular segment and the right-angle segment assembly components are connected to each other to form a rectangular segment ring; Rectangular segment ring longitudinal joint connection The hoisted plate-shaped segment assembly component is placed on the positioning sheath of the plate-shaped segment assembly component below, and the plate-shaped segment assembly component is pressed on the sealing rubber to seal the two plate-shaped segment assembly components, and the two plate-shaped segment assembly components are connected by bolts, thereby completing the connection of the longitudinal joint of the rectangular segment ring; Casting of joints and hollow casting areas Install concrete pouring templates at the annular joint connection of the rectangular segment ring, and adopt the method of multiple pouring of the local segment ring, pouring operations on the hollow pouring areas of the joints, plate-shaped segment assembly components, and right-angle segment assembly components while splicing, or complete the splicing of the entire ring of segments first, and then uniformly pour the hollow pouring operations on the joints, plate-shaped segment assembly components, and right-angle segment assembly components; Segment concrete curing and effect detection After the concrete pouring is completed, maintenance shall be carried out in accordance with the requirements of the concrete curing specifications. At the same time, the quality of concrete pouring and the overall engineering quality of the segment ring shall be monitored to ensure the mechanical properties and sealing and anti-seepage requirements of the caisson segments.

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