Full-section assembly method of large-section immersed tube reinforcement system in small dry dock

Abstract

A full-section assembly method for a large-section immersed tube reinforcement system in a small dry dock, the steps include: placing and positioning the lower transverse main reinforcement and the lower half stirrups of the bottom plate, positioning, placing and binding the lower longitudinal reinforcement of the plate, installing a bottom plate frame on the lower reinforcement layer of the bottom plate, positioning and placing the upper longitudinal reinforcement and the upper transverse reinforcement of the bottom plate on the bottom plate frame in sequence, binding the side wall reinforcement cage, and binding the top plate reinforcement cage. In the embodiment of the present invention, the side wall binding frame is used to position and fix the transverse main reinforcement, and there is no need to install a positioning frame separately to position and fix the arrangement of the transverse main reinforcement and ensure its arrangement accuracy; the erected lower half stirrups of the bottom plate are not only tied into the lower reinforcement layer of the bottom plate, but also support the bottom plate frame to keep it stable when connected with the longitudinal reinforcement by welding, and there are no oblique bracing beams on both sides of the longitudinal direction of the bottom plate frame to hinder, and the transverse reinforcement can be hoisted and tied while the welding operation is being carried out, which improves the efficiency of the reinforcement binding operation.

Description

Technical Field

[0001] The invention belongs to the technical field of immersed tube tunnels, and in particular relates to a full-section assembly method of a large-section immersed tube reinforcement system in a small dry dock. Background Art

[0002] For immersed tube tunnels, in order to achieve higher traffic flow, the span of the immersed tube needs to be increased to increase the internal space of the immersed tube, so as to set up more lanes. The increase in span makes the cross-section of the immersed tube larger. In order to meet the strength requirements under the large span, the steel cage tied during the prefabrication of the immersed tube needs to be reinforced with a rigid skeleton.

[0003] The steel cage of the immersed tube is gradually tied up from the bottom plate steel cage, the side wall steel cage to the top plate steel cage. The rigid skeleton also needs to be divided into the bottom plate skeleton, the side plate skeleton and the top plate skeleton, and then installed step by step. The bottom plate steel cage starts to be tied on the flat pedestal. In order to ensure accuracy, two sets of positioning frames need to be installed on the surface of the pedestal to position the transverse main steel bars and the longitudinal main steel bars laid on the pedestal respectively, and then tie and fix the two. After the tying is completed, the two sets of positioning frames need to be removed; when installing the bottom plate skeleton, diagonal braces need to be installed on both sides of it to stably support it to the upright state, and then tie and connect it with the lower half of the steel bars. The diagonal braces will block the insertion of the reinforcing bars between the main steel bars, increasing the difficulty and efficiency of the steel cage tying. In addition, after the bottom plate steel cage is tied, it needs to be moved to the side wall binding pedestal. After the side wall steel cage is tied, it needs to be moved to the top plate binding pedestal together with the bottom plate steel cage, which takes up a large construction space and cannot be constructed in a small dry dock. In addition, the large-span steel cage is easy to deform during the movement, resulting in a large error between the prefabricated immersed tube and the set external dimensions, which in turn makes it impossible to accurately connect the sections of the immersed tube, causing the immersed tube tunnel to have the risk of leakage.

[0004] Therefore, the current immersed tube reinforcement cage binding assembly will reduce the construction speed and extend the construction period due to the installation and removal of the positioning frame and the support of the rigid skeleton. Affected by many factors such as water temperature, weather conditions, and seasonal factors, the window period for immersed tube installation is relatively short. Since the prefabrication of the immersed tube needs to be completed before the window period for immersed tube installation, if the prefabrication of the immersed tube is delayed and cannot be completed before the window period for immersed tube installation, the completion time of the immersed tube tunnel will be further delayed. Summary of the invention

[0005] In view of the shortcomings existing in the related technology, the present invention provides a full-section assembly method of a large-section immersed tube steel bar system in a small dry dock, so as to solve the problems of low efficiency in the current steel cage binding and assembly construction leading to delayed tunnel completion and the need to move the steel cage during the binding process, which easily leads to deformation.

[0006] The present invention provides a full-section assembly method of a large-section immersed tube steel bar system in a small dry dock, comprising the following steps:

[0007] Position and place the bottom plate pads on the waterproof bottom steel plate, place the bottom plate lower transverse main reinforcement on the bottom plate pads, the ends of the bottom plate lower transverse main reinforcement are all bent to the vertical positioning part, and place the bottom plate lower half stirrups on the waterproof bottom steel plate at intervals in the horizontal direction;

[0008] Assemble the side wall tying frames on the ground on both sides of the waterproof bottom steel plate, and position and tie the two positioning parts of the lower transverse main reinforcement of the bottom plate on the two side wall tying frames respectively;

[0009] Position the lower longitudinal reinforcement of the bottom slab onto the lower transverse main reinforcement of the bottom slab, erect the lower half stirrups of the bottom slab, and tie them together with the lower transverse main reinforcement of the bottom slab and the lower longitudinal reinforcement of the bottom slab to form the lower reinforcement layer of the bottom slab;

[0010] Install the bottom plate frame on the bottom steel bar layer of the bottom plate. The bottom plate frame is attached to the vertical steel bar rods erected from the bottom half stirrups of the bottom plate and aligned with the transverse main bars of the bottom plate. The longitudinal steel bars of the bottom plate are welded to the bottom plate frame.

[0011] The upper longitudinal steel bars and the upper transverse steel bars of the bottom plate are positioned and placed on the bottom plate frame in sequence, and the upper stirrups of the bottom plate are installed, and they are tied together with the upper longitudinal steel bars and the upper transverse steel bars of the bottom plate to form a steel bar layer on the bottom plate and a bottom plate steel bar cage;

[0012] Tie the side wall outer facade steel bar layer of the side wall steel bar cage on the side wall tying frame, weld the side wall frame to the bottom plate frame, and tie it to the side wall outer facade steel bar layer, tie the side wall inner facade steel bar layer of the side wall steel bar cage on the side wall frame;

[0013] Assemble a top plate tying frame above the bottom plate steel cage, tie the lower steel layer of the top plate on the top plate tying frame, install a top plate frame on the lower steel layer of the top plate, tie the upper steel layer of the top plate on the top plate frame, and form a top plate steel cage;

[0014] Move out the side wall binding cradle, and move the outer formwork trolley to both sides of the waterproof bottom steel plate. The truss of the outer formwork trolley above the top plate steel cage is supported by steel cables to realize the support system conversion, and move the top plate binding cradle out from under the top plate steel cage.

[0015] In some of the embodiments, when installing the floor frame, the floor lower layer transverse reinforcing ribs are laid between adjacent floor lower layer transverse main ribs, and are tied and connected with the floor lower half stirrups;

[0016] The bottom frame diagonal braces are welded and installed on both sides of the bottom plate frame in the longitudinal direction, and the bottom frame diagonal braces are welded and connected to the steel bar layer under the bottom plate.

[0017] In some of the embodiments, a plurality of bottom plate steel bar positioning grooves are transversely arranged on the top surface of the bottom plate frame, the upper longitudinal steel bars of the bottom plate are all located in the corresponding bottom plate steel bar positioning grooves, and the upper transverse steel bars of the bottom plate are stacked on the upper longitudinal steel bars of the bottom plate;

[0018] The upper transverse reinforcement of the bottom plate includes the upper transverse main reinforcement of the bottom plate and the upper transverse reinforcing reinforcement of the bottom plate. The upper transverse main reinforcement of the bottom plate is aligned with the corresponding bottom plate frame and is tied and connected therewith.

[0019] In some of the embodiments, when tying the outer facade steel bar layer of the side wall and the inner facade steel bar layer of the side wall, a horizontal positioning frame is installed on the inner side surface of the side wall tying frame, and the horizontal positioning frame and the inner side surface of the side wall frame are provided with a plurality of horizontal positioning grooves from top to bottom, and the horizontal positioning grooves are arranged transversely, and the outer facade horizontal steel bars of the outer facade steel bar layer of the side wall and the inner facade horizontal steel bars of the inner facade steel bar layer of the side wall are placed transversely in the corresponding horizontal positioning grooves, and the side wall frame and the outer facade horizontal steel bars are welded and connected.

[0020] In some of the embodiments, when tying the side wall exterior facade steel bar layer and the side wall interior facade steel bar layer, the exterior facade vertical main reinforcement of the side wall exterior facade steel bar layer is connected to the positioning part of the lower layer of the transverse main reinforcement of the bottom plate, and is tied and connected with the exterior facade horizontal reinforcement, and multiple exterior facade vertical reinforcement bars are placed between adjacent exterior facade vertical main reinforcements, and are all tied and connected with the exterior facade horizontal reinforcements.

[0021] In some of the embodiments, a rectangular construction space is provided between two adjacent transverse support beams in the side wall frame, and a scaffolding board is installed between two longitudinally adjacent side wall frames, with both ends of the scaffolding board extending into the corresponding construction space and being erected on the corresponding transverse support beams;

[0022] Tie the inner facade steel bar layer of the side wall of the side wall steel cage on the scaffolding board, remove the scaffolding board, and weld the diagonal bracing beams between the diagonals of the construction space.

[0023] In some of the embodiments, the top of the top plate binding frame has a top platform plate, and the top platform plate is provided with a plurality of top plate lower layer steel bar positioning grooves in the transverse direction. The top plate lower layer steel bar positioning grooves are all vertically arranged, and the top plate lower layer longitudinal steel bars in the top plate lower layer steel bar layer are all vertically placed in the corresponding top plate lower layer steel bar positioning grooves.

[0024] In some of the embodiments, the top surface of the top platform plate has a transversely arranged support plate, a plurality of support plates are arranged longitudinally at intervals, and the steel bar positioning grooves in the lower layer of the top plate are all located on the support plate;

[0025] When tying the lower steel bar layer of the top plate, install the lower transverse positioning frame of the top plate on the top platform plate, position and lay the lower transverse main reinforcement of the top plate through the bottom transverse positioning frame of the top plate, place the lower half stirrups of the top plate on the top platform plate at intervals, lay the lower longitudinal reinforcement of the top plate through the lower steel bar positioning groove of the top plate, stand up the lower half stirrups of the top plate, and tie them together with the lower transverse main reinforcement of the top plate and the lower longitudinal reinforcement of the top plate to form the lower steel bar layer of the top plate.

[0026] The top plate frame is installed on the lower steel bar layer of the top plate. The top plate frame is attached to the vertical steel bars erected from the lower half stirrups of the top plate and is aligned with the transverse main bars of the lower layer of the top plate. The longitudinal steel bars of the lower layer of the top plate are welded to the top plate frame.

[0027] The upper longitudinal steel bars and the upper transverse steel bars of the top plate are positioned and placed on the top plate frame in sequence, and the upper stirrups of the top plate are installed, and they are tied together with the upper longitudinal steel bars and the upper transverse steel bars of the top plate to form a steel bar layer on the top plate, and a steel bar cage of the bottom plate;

[0028] Wherein: when installing the roof frame, the lower transverse reinforcement bars of the roof are laid between the lower transverse main bars of the adjacent roof plates, and are tied and connected with the lower half stirrups of the roof plates;

[0029] The top frame diagonal braces are welded and installed on both sides of the top plate frame in the longitudinal direction, and the top frame diagonal braces are welded and connected to the steel bar layer under the top plate;

[0030] A plurality of top plate upper steel bar positioning grooves are arranged on the top surface of the top plate frame, the top plate upper longitudinal steel bars are all located in the top plate upper steel bar positioning grooves, and the top plate upper transverse steel bars are all stacked on the top plate upper longitudinal steel bars;

[0031] The upper transverse reinforcement of the roof slab includes the upper transverse main reinforcement of the roof slab and the upper transverse reinforcing reinforcement of the roof slab. The upper transverse main reinforcement of the roof slab is aligned with the roof slab skeleton and is tied and connected thereto.

[0032] In some of the embodiments, the top plate steel cage is divided into an upper chamfered steel cage and a flat-top steel cage, and the top plate frame is divided into an upper chamfered frame and a flat-top frame. The upper chamfered steel cage is tied first, and then the flat-top steel cage is tied. When tying the upper chamfered steel cage, the upper chamfered frame is welded to the side wall frame; when tying the flat-top steel cage, the flat-top frame is welded to the upper chamfered frame.

[0033] In some of the embodiments, the trusses of the outer formwork trolley are connected to the lower top slab reinforcement layer of the top slab reinforcement cage via steel cables.

[0034] Based on the above technical scheme, in the embodiment of the present invention, the side wall binding frame is used to position and fix the transverse main reinforcement, and there is no need to separately install a positioning frame to position and fix the arrangement of the transverse main reinforcement and ensure its arrangement accuracy; the erected lower half hoop reinforcement of the bottom plate is not only tied into the bottom plate lower steel bar layer, but also supports the bottom plate skeleton, so that it remains stable when the longitudinal steel bars are welded and connected, and there are no oblique bracing beams on both sides of the longitudinal direction of the bottom plate skeleton to hinder the transverse reinforcement. While the welding operation is being carried out, the transverse reinforcement can be hoisted and tied, which improves the efficiency of steel bar tying; the steel cage does not need to be moved during the tying operation. After the top plate steel cage is tied, it is supported by the outer mold trolley through the steel cable, and the support system is converted to move the top plate binding frame out of the steel cage so that the inner mold trolley can enter and support the top plate steel cage. Further, while the steel cage remains in a fixed position, subsequent concrete pouring is achieved to ensure that the prefabricated immersed tube achieves a high accuracy, and then ensures that the immersed tube is accurately connected during installation, which solves the current low efficiency of steel cage tying construction leading to delayed tunnel completion and the problem that the steel cage needs to be moved during the tying process, which is easy to cause deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 It is a process flow chart of the full-section assembly method of the large-section immersed tube reinforcement system in a small dry dock of the present invention;

[0037] Figure 2 The schematic diagram of the construction of the bottom plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention Figure 1 ;

[0038] Figure 3 The schematic diagram of the construction of the bottom plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention Figure 2 ;

[0039] Figure 4 The schematic diagram of the construction of the bottom plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention Figure 3 ;

[0040] Figure 5 The schematic diagram of the construction of the bottom plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention Figure 4 ;

[0041] Figure 6 The schematic diagram of the construction of the bottom plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention Figure 5 ;

[0042] Figure 7 It is a construction schematic diagram of the side wall reinforcement cage binding in the full-section assembly method of the large-section immersed tube reinforcement system of the small dry dock of the present invention;

[0043] Figure 8 for Figure 7 A partial enlarged view of

[0044] Fig. 9 It is a structural schematic diagram of the side wall skeleton erecting scaffolding boards in the full-section assembly method of the large-section immersed tube steel bar system of the small dry dock of the present invention;

[0045] Fig.10 The construction diagram of the top plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention is shown in FIG. Figure 1 ;

[0046] Fig.11 The construction diagram of the top plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention is shown in FIG. Figure 2 ;

[0047] Fig.12 The construction diagram of the top plate reinforcement cage binding in the full section assembly method of the large section immersed tube reinforcement system of the small dry dock of the present invention is shown in FIG. Figure 3 ;

[0048] Fig.13 It is a structural schematic diagram of the system conversion in the full-section assembly method of the large-section immersed tube steel bar system of the small dry dock of the present invention;

[0049] Fig.14 for Fig.13 A partial enlarged view of

[0050] Fig.15 It is a structural schematic diagram of a rigid skeleton in a full-section assembly method of a large-section immersed tube reinforcement system in a small dry dock according to the present invention;

[0051] Fig.16 It is a structural schematic diagram of the connection between stirrups and transverse steel bars in the full-section assembly method of the large-section immersed tube steel bar system of a small dry dock according to the present invention;

[0052] Fig.17 It is a schematic diagram of the longitudinal arrangement of the rigid skeleton in the full-section assembly method of the large-section immersed tube reinforcement system in a small dry dock according to the present invention.

[0053] In the figure:

[0054] 1. Waterproof bottom steel plate; A. Side wall tyre tyre frame; B. Top plate tyre tyre frame; C. External mould trolley;

[0055] 2. Bottom plate reinforcement cage; 21. Bottom plate lower reinforcement layer; 22. Bottom plate upper reinforcement layer; 201. Bottom plate lower layer transverse main reinforcement; 2011. Positioning part; 202. Bottom plate lower half stirrups; 203. Bottom plate lower layer longitudinal reinforcement; 204. Bottom plate upper layer longitudinal reinforcement; 205. Bottom plate upper layer transverse reinforcement; 2051. Bottom plate upper layer transverse main reinforcement; 2052. Bottom plate upper layer transverse reinforcement; 206. Bottom plate upper half stirrups; 207. Bottom plate lower layer transverse reinforcement;

[0056] 31. Bottom plate frame; 32. Side wall frame; 33. Top plate frame; 33A. Upper chamfer frame; 33B. Flat top frame; 34. Bottom frame diagonal brace; 35. Top frame diagonal brace; 301. Horizontal support beam; 302. Construction space; 303. Scaffolding board; 304. Diagonal brace beam;

[0057] 4. Side wall reinforcement cage; 41. Side wall exterior reinforcement layer; 42. Side wall interior reinforcement layer; 401. Exterior facade horizontal reinforcement; 402. Interior facade horizontal reinforcement; 403. Exterior facade vertical main reinforcement; 404. Interior facade vertical main reinforcement;

[0058] 5. Top plate steel cage; 5A. Upper chamfered steel cage; 5B. Flat top steel cage; 51. Top plate lower steel layer; 52. Top plate upper steel layer; 501. Top plate lower longitudinal steel; 502. Top plate lower transverse main steel; 503. Top plate lower stirrups; 504. Top plate upper longitudinal steel; 505. Top plate upper transverse steel; 5051. Top plate upper transverse main steel; 5052. Top plate upper transverse reinforcement; 506. Top plate upper stirrups; 507. Top plate lower transverse reinforcement;

[0059] 6. Steel cable; 7. Horizontal positioning frame; 71. Horizontal positioning groove; 8. Top platform plate; 81. Support plate; 801. Top plate lower layer steel bar positioning groove. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] like Figures 1 to 17 As shown, in an illustrative embodiment of the full-section assembly method of a large-section immersed tube steel bar system in a small dry dock of the present invention, the following steps are included:

[0065] Lay a waterproof bottom steel plate 1 on the bottom of the dry dock, and mark the position and position on the waterproof bottom steel plate 1. Figure 2 As shown, the bottom plate pad is positioned and placed on the waterproof bottom steel plate 1 according to the marking line, and the bottom plate lower transverse main reinforcement 201 is placed on the bottom plate pad, and the ends of the bottom plate lower transverse main reinforcement 201 are all bent to the vertical positioning portion 2011. Since the bottom plate pad raises the bottom plate lower transverse main reinforcement 201, the bottom plate lower half stirrups 202 are placed on the waterproof bottom steel plate 1 at intervals, that is, the bottom plate lower half stirrups 202 are inserted into the space between the bottom plate lower transverse main reinforcement 201 and the waterproof bottom steel plate 1. The bottom plate lower transverse main reinforcement 201 will not hinder the placement of the bottom plate lower half stirrups 202, and the bottom plate lower half stirrups 202 are U-shaped and placed according to the longitudinal marking line.

[0066] Side wall tying frames A are assembled on the ground on both sides of the waterproof bottom steel plate 1, and the two positioning parts 2011 of the lower layer transverse main reinforcement 201 of the bottom plate are respectively positioned and tied to the two side wall tying frames A, so that the side wall tying frames A on both sides can position and fix the lower layer transverse main reinforcement 201 of the bottom plate.

[0067] like Figure 3 As shown, the bottom slab lower longitudinal steel bars 203 are positioned according to the longitudinal markings and placed on the bottom slab lower transverse main bars 201, the bottom slab lower half stirrups 202 are erected with their openings facing upward, the steel bars on both sides are vertical, and the steel bars at the bottom are horizontal, and the bottom of the bottom slab lower half stirrups 202 are tied together with the bottom slab lower transverse main bars 201 and the bottom slab lower longitudinal steel bars 203 to form a bottom slab lower steel bar layer 21, and the vertical steel bars on both sides of the bottom slab lower half stirrups 202 extend upward relative to the bottom slab lower steel bar layer 21. Among them, the placement of the bottom plate lower longitudinal steel bars 203 and the erection of the bottom plate lower half stirrups 202 are arranged as they are placed, that is, when a bottom plate lower longitudinal steel bar 203 is placed, a corresponding bottom plate lower half stirrup 202 is erected, and the three are tied together. Since the bottom plate lower transverse main reinforcement 201 has been fixed by the side wall binding frame A, the bottom plate lower longitudinal steel bars 203 are placed on the bottom plate lower transverse main reinforcement 201, that is, the two are tied together with the bottom plate lower half stirrups 202, and the bottom plate lower longitudinal steel bars 203 are fixed, so that the bottom plate lower longitudinal steel bars 203 are evenly arranged and evenly supported.

[0068] like Figure 4 As shown, a bottom plate frame 31 is installed on the bottom plate lower steel bar layer 21, and the bottom plate frame 31 is abutted against the bottom plate lower half stirrup 202 and erected to the vertical steel bar. The bottom plate lower half stirrup 202 supports the bottom plate frame 31 through the vertical steel bar to keep it upright. The bottom plate frame 31 is aligned with the bottom plate lower layer transverse main reinforcement 201, so that the bottom plate frame 31 is positioned through the adjacent bottom plate lower layer transverse main reinforcement 201 to ensure that the bottom plate frame 31 is accurately installed. The bottom plate lower layer longitudinal reinforcement 203 are all welded to the bottom plate frame 31, and the bottom plate frame 31 is stably connected to the bottom plate lower steel bar layer 21 through the welding connection and the longitudinal support of the bottom plate lower half stirrup 202.

[0069] like Figure 5 As shown, the upper longitudinal steel bars 204 and the upper transverse steel bars 205 of the bottom plate are positioned and placed in sequence on the bottom plate frame 31. The multiple bottom plate frames 31 arranged longitudinally provide support points for the upper longitudinal steel bars 204 of the bottom plate, and the upper longitudinal steel bars 204 of the bottom plate are placed by using the bottom plate frame 31, so that the spacing between the upper and lower layers of the bottom plate steel bar cage 2 can be positioned by the bottom plate frame 31. After the upper longitudinal steel bars 204 of the bottom plate are positioned and placed, the upper longitudinal steel bars 204 of the bottom plate provide support points for the upper transverse steel bars 205 of the bottom plate.

[0070] like Figure 6As shown, the upper stirrups 206 of the bottom plate are installed and tied together with the upper longitudinal steel bars 204 and the upper transverse steel bars 205 of the bottom plate to form the upper steel bar layer 22 of the bottom plate and the bottom steel bar cage 2. The installation of the upper stirrups 206 of the bottom plate is as it is placed, that is, one upper transverse steel bar 205 of the bottom plate is placed, one upper stirrup 206 of the bottom plate is installed, and the three are tied together to ensure that the upper transverse steel bars 205 of the bottom plate are arranged evenly and provide even support.

[0071] The upper stirrups 206 of the bottom plate are in an inverted U shape, with the horizontal steel bars being laid on two adjacent transverse main bars, and the vertical steel bars on both sides extending downward to the bottom plate lower steel bar layer 21 and hooked on the corresponding transverse main bars; the lower stirrups 202 of the bottom plate are in a U shape, with the horizontal steel bars being attached to the two adjacent transverse main bars from bottom to top, and the vertical steel bars on both ends extending upward to the floor steel bar layer and hooked on the corresponding transverse main bars. Fig.16 As shown, the vertical reinforcement bars of the upper stirrups 206 of the bottom plate and the lower stirrups 202 of the bottom plate are tied and connected, so that the lower reinforcement layer 21 of the bottom plate and the reinforcement layer 22 of the bottom plate are mutually tightened by the stirrups.

[0072] like Figure 7 As shown, the side wall outer facade steel bar layer 41 of the side wall steel bar cage 4 is tied on the side wall tying frame A, the side wall frame 32 is welded to the bottom plate frame 31 and tied and connected to the side wall outer facade steel bar layer 41, and the side wall inner facade steel bar layer 42 of the side wall steel bar cage 4 is tied on the side wall frame 32.

[0073] Assemble the top plate tying frame B above the bottom plate steel bar cage 2, tie the top plate lower steel bar layer 51 on the top plate tying frame B, install the top plate frame 33 on the top plate lower steel bar layer 51, tie the top plate upper steel bar layer 52 on the top plate frame 33, and form the top plate steel bar cage 5.

[0074] like Fig.13 As shown, the side wall tying frame A is moved out to free up the ground on both sides of the steel cage. Since the positioning portion 2011 of the lower transverse main reinforcement 201 of the bottom plate is tied and connected with the side wall tying frame A, before moving out the side wall tying frame A, the tied wire is removed to disconnect the connection between the side wall tying frame A and the lower transverse main reinforcement 201 of the bottom plate. Since the space has been vacated, the outer mold trolley C is moved to both sides of the waterproof bottom steel plate 1. The truss of the outer mold trolley C above the top plate steel cage 5 is supported by the steel cable 6 to realize the support system conversion, and the top plate tying frame B is moved out from under the top plate steel cage 5.

[0075] In the above-mentioned exemplary embodiment, in the full-section assembly method of the large-section immersed tube reinforcement system in the small dry dock, the side wall binding frame A is used to position and fix the transverse main reinforcement, and there is no need to separately install a positioning frame on the waterproof bottom steel plate 1 or on the bottom ground of the dock to position and fix the arrangement of the transverse main reinforcement, thereby ensuring its arrangement accuracy and arranging it according to the set spacing in the longitudinal direction. The transverse main reinforcement serves as the main reinforcement, and has a larger outer diameter. The transverse main reinforcement accurately arranged in the longitudinal direction is evenly distributed, fully supports each end face of the immersed tube in the longitudinal direction, and improves the stability of the immersed tube under a large span. The erected bottom half stirrups 202 of the bottom plate are not only tied to form the bottom plate lower steel bar layer 21, but also support the bottom plate frame 31, so that it remains stable when the longitudinal steel bars are welded and connected. There are no oblique bracing beams 304 on both sides of the bottom plate frame 31 to hinder the welding operation. While the welding operation is being carried out, the transverse reinforcement bars are suspended between the adjacent transverse main bars and tied, which improves the efficiency of the steel bar tying operation. During the tying operation, the steel bar cage does not need to be moved to avoid deformation of the steel bar cage due to movement. It is only necessary to remove the side wall tying frame A and move in and out the top The top plate tyre B, the positional relationship between the steel cage and the waterproof bottom steel plate 1 is stable. When the waterproof bottom steel plate 1 is used as the bottom formwork for pouring concrete for prefabricated immersed tubes, the bottom plate of the immersed tube can be accurately made. The stable steel cage ensures that the prefabricated immersed tube reaches a high precision, thereby ensuring that the immersed tube is installed with accurate docking; after the top plate steel cage 5 is tied, it is supported by the outer formwork trolley C through the steel cable 6, and the support system is converted to make the top plate tyre B move out of the steel cage, so that the inner formwork trolley can enter and support the top plate steel cage 5, and further ensure the steel cage. Under the condition of fixed position; since one immersed tube is prefabricated into multiple tube sections, the top plate tying cradle B is moved out through the support system conversion, so that the top plate tying cradle B and the side wall tying cradle A can be moved to the construction area of ​​the next tube section as soon as possible. When the concrete is poured in the previous tube section, the steel cage of the next tube section is tied simultaneously, which improves the overall efficiency of immersed tube prefabrication, shortens the construction period, and solves the current problems of low efficiency of steel cage tying construction leading to delayed tunnel completion and the deformation of the steel cage caused by the need to move during the tying process.

[0076] The transverse main reinforcement 201 of the lower layer of the bottom plate is a relatively thick steel bar, which serves as the main supporting steel bar of the bottom plate steel cage 2 and is aligned with the bottom plate frame 31 to form a stable steel frame composite structure. In addition, multiple steel bars are distributed longitudinally to improve the stability of the immersed tube under large spans.

[0077] In some embodiments, when installing the bottom plate frame 31, the bottom plate lower layer transverse reinforcing ribs 207 are laid between adjacent bottom plate lower layer transverse main ribs 201 and tied and connected with the bottom plate lower half stirrups 202. After the bottom plate lower layer transverse reinforcing ribs 207 are laid and tied and fixed, Fig.17As shown, the bottom frame diagonal braces 34 are welded and installed on both sides of the bottom plate frame 31 in the longitudinal direction, and the bottom frame diagonal braces 34 are welded and connected to the steel bar layer 21 under the bottom plate. The bottom frame diagonal braces 34 support the floor frame longitudinally, further improving the longitudinal stability of the bottom plate frame 31, so that it can support the steel bar layer 22 on the bottom plate more stably upward. In addition, since the skeleton composite structure composed of the bottom plate frame 31 and the transverse main reinforcement bears more vertical ballast, the bottom frame diagonal braces 34 support in the lateral direction, which can improve the vertical stability of the bottom plate frame 31, bear the vertical ballast to the maximum extent, and improve the stability of the immersed tube.

[0078] In some embodiments, a plurality of bottom plate steel bar positioning grooves are transversely arranged on the top surface of the bottom plate frame 31, and the bottom plate upper longitudinal steel bars 204 are all located in the corresponding bottom plate steel bar positioning grooves, and the bottom plate upper transverse steel bars 205 are stacked on the bottom plate upper longitudinal steel bars 204. Since the bottom plate upper longitudinal steel bars 204 are located above the bottom plate frame 31, far away from the ground and the markings on the waterproof bottom steel plate 1, it is difficult to achieve accurate arrangement by aligning the markings. The longitudinal spacing of the bottom plate upper longitudinal steel bars 204 is positioned by the bottom plate steel bar positioning grooves to ensure that the arrangement position of the bottom plate upper longitudinal steel bars 204 is accurate and fully supports the bottom plate. In addition, the bottom plate lower longitudinal steel bars 203 of the bottom plate lower steel bar layer 21 are close to the waterproof bottom steel plate 1 and the markings on the ground, and are placed by aligning the markings. With the erection, binding and fixing of the bottom plate lower half stirrups 202, they can be accurately arranged. There is no need to slot the bottom of the bottom plate frame 31 to position the bottom plate lower longitudinal steel bars 203. Only slots are made at the top of the bottom plate frame 31 to ensure the strength of the bottom plate frame 31.

[0079] The upper transverse reinforcement 205 of the bottom plate includes the upper transverse main reinforcement 2051 of the bottom plate and the upper transverse reinforcing reinforcement 2052 of the bottom plate. The upper transverse main reinforcement 2051 of the bottom plate is aligned with the corresponding bottom plate frame 31 and tied thereto. The upper transverse main reinforcement 2051 of the bottom plate is positioned and tied by the bottom plate frame 31 to improve the accuracy of its installation position. Moreover, since the main reinforcement is thicker than the reinforcing reinforcement, the upper and lower transverse main reinforcements are aligned with the bottom plate frame 31 to form a high-strength steel bar frame composite structure, and the entire end face of the immersed tube is covered in the transverse direction, which can provide more stable support under a large span and improve the stability of the immersed tube. At the same time, the upper transverse main reinforcement 2051 of the bottom plate falls on the upper longitudinal reinforcement 204 of the bottom plate, not only aligning with the bottom plate frame 31, but also being tied and connected with the bottom plate frame 31 and the upper longitudinal reinforcement 204 of the bottom plate, and the upper longitudinal reinforcement 204 of the bottom plate is located in the bottom plate reinforcement positioning groove, so that the upper transverse main reinforcement 2051 of the bottom plate can be attached to the upper edge of the bottom plate frame 31, and then can be welded to it, further improving the strength of the reinforcement frame composite structure, and increasing the strength of the bottom plate reinforcement cage 2 in the span direction. In addition, relatively thick main reinforcement is used at the position of the bottom plate frame 31, and relatively thin reinforcement is used at other positions to ensure the strength of the bottom plate reinforcement cage 2 under a large span, thereby reducing the weight of the bottom plate reinforcement cage 2, thereby reducing the weight of the immersed tube and reducing the difficulty of the immersed tube sinking operation.

[0080] In some embodiments, Figures 7 and 8 As shown, when tying the side wall outer facade steel bar layer 41 and the side wall inner facade steel bar layer 42, a horizontal positioning frame 7 is installed on the inner side of the side wall tying frame A, and the horizontal positioning frame 7 and the inner side of the side wall frame 32 are provided with a plurality of horizontal positioning grooves 71 from top to bottom, and the horizontal positioning grooves 71 are arranged transversely, and the outer facade horizontal steel bars 401 of the side wall outer facade steel bar layer 41 and the inner facade horizontal steel bars 402 of the side wall inner facade steel bar layer 42 are both located in the corresponding horizontal positioning grooves 71, and the side wall frame 32 and the outer facade horizontal steel bars 401 are both welded and connected.

[0081] The horizontal positioning frame 7 of the side wall tyre frame A and the side wall frame 32 respectively position the horizontal reinforcement bars 401 of the exterior facade and the horizontal reinforcement bars 402 of the interior facade through the horizontal positioning grooves 71, so that they are evenly arranged vertically. The horizontal positioning frame 7 on the side wall tyre frame A positions the horizontal reinforcement bars 401 of the exterior facade. The horizontal positioning frame 7 is located on the side wall tyre frame A and can be transported to the next construction area as a whole along with the side wall tyre frame A. No additional positioning frame installation and disassembly steps are added, thus avoiding the extension of the construction period. The side wall frame 32 only has grooves on its inner side to position the horizontal reinforcement bars 402 of the interior facade, thereby maintaining its structural strength and increasing the tightness of the connection with the horizontal reinforcement bars 402 of the interior facade after being tied and connected, so that the weight of the reinforcement layer 42 of the interior facade of the side wall can be more fully borne by the side wall frame 32, thereby improving the stability of the reinforcement layer 42 of the interior facade of the side wall. Qualitatively, further, the outer side of the side wall frame 32 is welded and connected to the horizontal steel bars 401 of the side wall exterior steel bar layer 41, so that the side wall exterior steel bar layer 41 and the side wall interior steel bar layer 42 are more stably supported laterally through the side wall frame 32, and because the side wall frame 32 is welded to the floor frame, and the side wall frame 32 is welded and connected to the horizontal steel bars 401, the bottom plate frame 31 provides stable support for the horizontal steel bars 401 through the side wall frame 32. At this time, the side wall tying frame A can be moved horizontally, and the positioning frame can be withdrawn from the side wall exterior steel bar layer 41, so that the side wall tying frame A can be transported to the construction area of ​​the next pipe section earlier.

[0082] Since the horizontal positioning groove 71 is arranged horizontally, after the external facade horizontal steel bars 401 and the internal facade horizontal steel bars 402 are placed in the horizontal positioning groove 71, the horizontal positioning groove 71 can support them vertically so that they can be arranged stably. After the horizontal steel bars are arranged and placed, when the vertical steel bars of the side wall external facade steel bar layer 41 and the side wall internal facade steel bar layer 42 are hung, the vertical steel bars are attached to the corresponding horizontal steel bars from the outside to the inside and tied and connected with them to prevent them from falling out of the horizontal positioning groove 71 and keep the arrangement accurate. When the vertical steel bars are hung and tied and connected with the horizontal steel bars, in order to ensure the accurate arrangement of the vertical steel bars, they are tied as they are hung, that is, when a vertical steel bar is hung, it is tied and connected with the corresponding horizontal steel bars. After the side wall steel cage 4 is tied, since the horizontal positioning groove 71 is set horizontally, the side wall tying frame A can be moved laterally to the outside, so that the facade horizontal steel bars 401 can be disengaged from the horizontal positioning grooves 71 of the horizontal positioning frame 7, and the side wall tying frame A can be transported to the construction area of ​​the next pipe section to tie the steel cage of the next pipe section, thereby improving the turnover efficiency of the side wall tying frame A and the speed of the immersed pipe prefabrication operation.

[0083] In some embodiments, when tying the side wall exterior facade steel bar layer 41 and the side wall interior facade steel bar layer 42, the exterior facade vertical main reinforcement 403 of the side wall exterior facade steel bar layer 41 is connected to the positioning portion 2011 of the lower layer transverse main reinforcement 201 of the bottom plate, and is tied and connected to the exterior facade horizontal steel bar 401, and a plurality of exterior facade vertical reinforcement ribs are provided between adjacent exterior facade vertical main reinforcements 403, and are all tied and connected to the exterior facade horizontal steel bar 401.

[0084] Since the positioning part 2011 of the lower transverse main reinforcement 201 of the bottom plate is connected to the side wall binding frame A by positioning and binding, and the side wall binding frame A has a horizontal positioning frame 7, the binding of the side wall facade reinforcement layer 41 can be started while the binding operation of the lower reinforcement layer 21 of the bottom plate is being carried out. The side wall facade reinforcement layer 41 is placed in each horizontal positioning groove 71 of the horizontal positioning frame 7, and the facade vertical main reinforcement 403 is suspended in turn, connected to the corresponding positioning frame, and further connected to the horizontal reinforcement binding. The facade vertical main reinforcement 403 is positioned and bound by the positioning frame, which improves the binding and installation accuracy of the facade vertical main reinforcement 403, and is combined and connected with the lower transverse main reinforcement 201 of the bottom plate, as a steel reinforcement skeleton with a thicker outer diameter surrounding the immersed tube, thereby improving the strength of the immersed tube. A plurality of vertical reinforcement bars are suspended between adjacent vertical main bars 403 of the facades. Since the vertical reinforcement bars do not need to be combined with the rigid frame to form a steel frame composite structure, it is only necessary to ensure the number of reinforcement bars and avoid contact with each other to ensure the support strength between the steel frame composite structures.

[0085] After completing the binding of the upper steel bar layer 22 of the bottom plate, since the upper transverse main reinforcement 2051 of the bottom plate is positioned and aligned with the bottom plate frame 31, the inner vertical main reinforcement 404 of the inner facade steel bar layer 42 of the side wall is connected with the corresponding upper transverse main reinforcement 2051 of the bottom plate, thereby improving the binding and installation accuracy of the inner vertical main reinforcement 404, and congratulating the connection with the upper transverse main reinforcement 2051 of the bottom plate, serving as a steel bar frame with a thicker outer diameter surrounding the immersed tube, thereby improving the strength of the immersed tube.

[0086] The side wall binding frame A is provided with a horizontal positioning frame 7 having a horizontal positioning groove 71. The horizontal positioning frame 7 is a plurality of frame plates arranged at intervals in the longitudinal direction. The horizontal positioning frame 7 is provided on each frame plate, and the frame plate is staggered with the side wall frame 32, so that the vertical main reinforcement 403 of the outer facade can be aligned with the side wall frame 32 and tied and connected therewith. When the horizontal positioning groove 71 is provided on the side wall frame 32, the horizontal reinforcement 402 of the inner facade is located in the horizontal positioning groove 71, and the vertical main reinforcement 404 of the inner facade is attached to the horizontal reinforcement 402 of the inner facade and to the inner edge of the side wall frame 32. The three are tied and connected, and the vertical main reinforcement 404 of the inner facade can be welded and connected to the inner edge of the side wall frame 32. The inner and outer sides of the side wall frame 32 are respectively connected to the vertical main reinforcement 404 of the inner facade and the vertical main reinforcement 403 of the outer facade, forming a steel reinforcement frame composite structure in the circumferential direction of the immersed tube section, thereby improving the strength of the side wall steel reinforcement cage 4.

[0087] In some embodiments, Fig. 9 As shown, there is a rectangular construction space 302 between two adjacent transverse support beams 301 in the side wall frame 32, and a scaffolding board 303 is installed between two longitudinally adjacent side wall frames 32, and both ends of the scaffolding board 303 extend into the corresponding construction space 302 and are erected on the corresponding transverse support beam 301. The side wall inner facade steel bar layer 42 of the side wall steel bar cage 4 is tied to the scaffolding board 303, the scaffolding board 303 is removed, and the diagonal bracing beam 304 is welded between the diagonals of the construction space 302.

[0088] Each rectangular frame of the rigid skeleton has a diagonal bracing beam 304 to increase its structural strength. At least one rectangular frame in the side wall skeleton 32 is not installed with the diagonal bracing beam 304, and is used as a construction space 302, and a scaffolding board 303 is set up, so that workers can stand on the scaffolding board 303 and tie the inner facade steel bar layer 42 of the side wall at a closer position, making full use of the space where the side wall skeleton 32 is located, improving the convenience of the tying operation, and improving work efficiency.

[0089] In some embodiments, Figure 13 to Figure 14 As shown, the top of the top plate tying frame B has a top platform plate 8, and a plurality of top plate lower layer steel bar positioning grooves 801 are arranged in the transverse direction on the top platform plate 8. The top plate lower layer longitudinal steel bars 501 in the top plate lower layer steel bar layer 51 are all located in the corresponding top plate lower layer steel bar positioning grooves 801, and the top plate lower layer steel bar positioning grooves 801 are all arranged vertically.

[0090] The lower layer longitudinal steel bars 501 of the top plate are directly positioned and placed using the lower layer steel bar positioning grooves 801 on the top plate binding cradle B. The lower layer steel bar positioning grooves 801 of the top plate are all vertically arranged so that their openings face upward, and the lower layer longitudinal steel bars 501 of the top plate that fall therein are difficult to escape. When the two sides of the top platform plate 8 are tilted so that the two ends of the top plate steel bar cage 5 have chamfers, the lower layer longitudinal steel bars 501 of the top plate cannot slide off the top platform plate 8 either, and they maintain their positioning positions, and are connected to the lower layer transverse steel bars of the top plate to form the lower layer steel bar layer 51 of the top plate. In addition, after the top plate steel bar cage 5 is tied, the vertically arranged lower layer steel bar positioning grooves 801 of the top plate enable the top plate binding cradle B to lower its top platform plate 8, and the longitudinal steel bars of the lower layer steel bar layer 51 of the top plate can all escape from the lower layer steel bar positioning grooves 801 of the top plate, making it easy to move the top plate binding cradle B out of the steel bar cage and transport it to the construction area of ​​the next pipe section, thereby improving the construction efficiency of the immersed pipe prefabrication.

[0091] In some embodiments, the top surface of the top platform plate 8 has a transversely arranged support plate 81 , and a plurality of support plates 81 are longitudinally spaced apart, and the top plate lower layer steel bar positioning grooves 801 are all located on the support plate 81 .

[0092] When tying the top plate lower steel bar layer 51, install the top plate lower transverse positioning frame on the top platform plate 8. The top plate lower transverse positioning frame has a plurality of positioning grooves arranged longitudinally and opening upwards. Lay the top plate lower transverse main reinforcement 502 and place it into each positioning groove of the top plate lower transverse positioning frame. The top plate lower transverse positioning frame holds up the top plate lower transverse main reinforcement 502 so that there is a gap between it and the top surface of the top platform plate 8. The top plate lower half stirrups 503 are placed on the top platform plate 8 at a transverse interval, that is, the top plate lower half stirrups 503 are stuffed into the gap. The top plate lower longitudinal reinforcement 501 is laid through the top plate lower reinforcement positioning groove 801. Since the top plate lower reinforcement positioning groove 801 is located on the support plate 81, the top plate lower longitudinal reinforcement 501 is raised and stacked from top to bottom on the top plate lower transverse main reinforcement 502. Fig.10 As shown, the lower half stirrups 503 of the top plate are erected and tied together with the lower transverse main reinforcement 502 of the top plate and the lower longitudinal reinforcement 501 of the top plate to form the lower reinforcement layer 51 of the top plate. The erection and tying of the lower half stirrups 503 of the top plate adopt the same erection and tying operation method as the tying process of the lower reinforcement layer 21 of the bottom plate.

[0093] The top plate frame 33 is installed on the top plate lower steel bar layer 51. The top plate frame 33 is attached to the top plate lower half stirrup 503 and erected to the vertical steel bar, and is aligned with the top plate lower transverse main reinforcement 502. The top plate lower longitudinal reinforcement 501 is welded to the top plate frame 33. The top plate frame 33 is supported by stirrups in the same way as the bottom plate frame 31. When welding, there is no need to set diagonal bracing structures on both sides of the longitudinal direction to ensure that the transverse reinforcement ribs can be placed synchronously.

[0094] like Fig.11 As shown, the upper longitudinal steel bars 504 and the upper transverse steel bars 505 of the top plate are positioned and placed in sequence on the top plate frame 33, as shown in FIG. Fig.12 As shown, the upper stirrups 506 of the top plate are installed and tied together with the upper longitudinal steel bars 504 and the upper transverse steel bars 505 of the top plate to form the upper steel bar layer 52 of the top plate and the bottom plate steel bar cage 2.

[0095] When installing the roof frame 33, the roof lower layer transverse reinforcing ribs 507 are laid between adjacent roof lower layer transverse main ribs 502 and tied and connected with the roof lower half stirrups 503. Fig.17 As shown, top frame diagonal braces 35 are welded and installed on both sides of the top plate frame 33 in the longitudinal direction, and the top frame diagonal braces 35 are welded and connected to the top plate lower steel bar layer 51. The top plate frame 33 and the bottom plate frame 31 adopt the same method, and after installing the transverse reinforcement ribs, longitudinal support is performed to improve vertical stability.

[0096] The top surface of the top plate frame 33 is provided with a plurality of top plate upper steel bar positioning grooves, the top plate upper longitudinal steel bars 504 are all located in the top plate upper steel bar positioning grooves, and the top plate upper transverse steel bars 505 are all stacked on the top plate upper longitudinal steel bars 504. The top plate upper transverse steel bars 505 include top plate upper transverse main bars 5051 and top plate upper transverse reinforcing bars 5052, and the top plate upper transverse main bars are aligned with the top plate frame 33 and tied and connected thereto. The top plate frame 33 adopts the same method as the bottom plate frame 31, and its upper and lower sides are connected with thicker transverse main bars, forming a steel bar frame composite structure with high structural strength in the span direction of the steel cage, thereby improving the strength of the immersed tube under a large span.

[0097] In some embodiments, Fig.13 As shown, the top plate reinforcement cage 5 is divided into an upper chamfer reinforcement cage 5A and a flat top reinforcement cage 5B. Fig.15 As shown, the top plate frame 33 is divided into an upper chamfered frame 33A and a flat-top frame 33B. The upper chamfered steel cage 5A is tied first, and then the flat-top steel cage 5B is tied. When tying the upper chamfered steel cage 5A, the upper chamfered frame 33A is welded to the side wall frame 32; when tying the flat-top steel cage 5B, the flat-top frame 33B is welded to the upper chamfered frame 33A.

[0098] Since both sides of the top of the immersed tube are chamfered, the top plate is divided into an upper chamfered portion with two inclined ends and a flat top portion horizontal in the middle, and the corresponding steel cages therein are upper chamfered steel cages 5A and flat top steel cages 5B. Due to the chamfering, the top platform plate 8 of the top plate tying frame B is inclined on both sides. When the upper chamfered steel cage 5A is tied, in order to prevent the upper transverse main reinforcement of the top plate and the lower half stirrups 503 of the top plate from sliding off, the upper transverse main reinforcement of the top plate is connected with the corresponding vertical reinforcement in the outer wall facade reinforcement layer. The lower half stirrups 503 of the top plate adopt a construction method of swinging, erecting and tying. When a lower half stirrup 503 of the top plate is placed, it is erected and tied. Since the half stirrup is U-shaped, it can pass through the space between the upper transverse main reinforcements of the adjacent top plates and detour below it by rotating, so as to extend upward and be tied. After being tied and fixed, the steel bars on both sides of the lower half stirrups 503 of the top plate are perpendicular to the surface of the corresponding top platform plate 8, so that it is in an erected state, and longitudinally supports the upper chamfered skeleton 33A.

[0099] In some embodiments, Figure 13 to Figure 14As shown, the truss of the outer mold trolley C is connected to the top plate lower steel bar layer 51 of the top plate steel bar cage 5 through the steel cable 6. The top plate frame 33 and the top plate lower steel bar layer 51 are heavy, and the top plate upper steel bar layer 52 is connected by welding and stirrups. If the steel cable 6 is connected to the top plate steel bar layer 52, the top plate frame 33 and the top plate lower steel bar layer 51 cannot be directly supported by the steel cable 6, and the weight of both will pull the stirrups downward, causing the top plate steel bar cage 5 to loosen or even fall apart. The steel cable 6 is connected to the top plate lower steel bar layer 51, so that it fully supports the top plate steel bar cage 5, and all loads are supported by the steel cable 6 to ensure the stability of the structure of the top plate steel bar cage 5. In addition, the steel cable 6 supports the lower layer of the top plate steel cage 5, which can prevent the steel bar layer 51 under the top plate from bending and deforming downward. While ensuring the stability of the top plate steel cage 5, it ensures that the top platform plate 8 of the top plate tying vehicle drops to a shorter set height, which can make the longitudinal steel bars of the steel bar layer 51 under the top plate escape from the positioning groove of the top platform plate 8, so that it can enter the process of being transported to another pipe section construction area more quickly, thereby improving the efficiency of the overall prefabrication operation of the immersed tube.

[0100] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0101] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A full-section assembly method for a large-section immersed tube reinforcement system in a small dry dock, characterized in that: The steps include: Position and place the bottom plate pads on the waterproof bottom steel plate, place the bottom plate lower transverse main reinforcement on the bottom plate pads, the ends of the bottom plate lower transverse main reinforcement are all bent to the vertical positioning part, and place the bottom plate lower half stirrups on the waterproof bottom steel plate at intervals in the horizontal direction; Assemble the side wall tying frames on the ground on both sides of the waterproof bottom steel plate, and position and tie the two positioning parts of the lower transverse main reinforcement of the bottom plate on the two side wall tying frames respectively; Position and place the lower longitudinal reinforcement of the bottom plate on the lower transverse main reinforcement of the bottom plate, erect the lower half stirrups of the bottom plate, and arrange the lower longitudinal reinforcement of the bottom plate and erect the lower half stirrups of the bottom plate in a sequential manner; tie the erected lower half stirrups with the lower transverse main reinforcement of the bottom plate and the lower longitudinal reinforcement of the bottom plate to form a reinforcement layer of the bottom plate; Install the bottom plate frame on the bottom steel bar layer of the bottom plate. The bottom plate frame is attached to the vertical steel bar rods erected from the bottom half stirrups of the bottom plate and aligned with the transverse main bars of the bottom plate. The longitudinal steel bars of the bottom plate are welded to the bottom plate frame. The upper longitudinal steel bars and the upper transverse steel bars of the bottom plate are positioned and placed on the bottom plate frame in sequence, and the upper stirrups of the bottom plate are installed, and they are tied together with the upper longitudinal steel bars and the upper transverse steel bars of the bottom plate to form a steel bar layer on the bottom plate and a bottom plate steel bar cage; Tie the side wall outer facade steel bar layer of the side wall steel bar cage on the side wall tying frame, weld the side wall frame to the bottom plate frame, and tie it to the side wall outer facade steel bar layer, tie the side wall inner facade steel bar layer of the side wall steel bar cage on the side wall frame; Assemble a top plate tying frame above the bottom plate steel cage, tie the lower steel layer of the top plate on the top plate tying frame, install a top plate frame on the lower steel layer of the top plate, tie the upper steel layer of the top plate on the top plate frame, and form a top plate steel cage; Move out the side wall binding cradle, and move the outer formwork trolley to both sides of the waterproof bottom steel plate. The truss of the outer formwork trolley above the top plate steel cage is supported by steel cables to realize the support system conversion, and move the top plate binding cradle out from under the top plate steel cage.

2. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: When installing the floor frame, lay the floor lower transverse reinforcement bars between the adjacent floor lower transverse main bars and tie them together with the floor lower half stirrups; The bottom frame diagonal braces are welded and installed on both sides of the bottom plate frame in the longitudinal direction, and the bottom frame diagonal braces are welded and connected to the steel bar layer under the bottom plate.

3. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: A plurality of bottom plate steel bar positioning grooves are transversely arranged on the top surface of the bottom plate frame, the upper longitudinal steel bars of the bottom plate are all located in the corresponding bottom plate steel bar positioning grooves, and the upper transverse steel bars of the bottom plate are stacked on the upper longitudinal steel bars of the bottom plate; The upper transverse reinforcement of the bottom plate includes the upper transverse main reinforcement of the bottom plate and the upper transverse reinforcing reinforcement of the bottom plate. The upper transverse main reinforcement of the bottom plate is aligned with the corresponding bottom plate frame and is tied and connected therewith.

4. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: When tying the outer facade steel bar layer of the side wall and the inner facade steel bar layer of the side wall, a horizontal positioning frame is installed on the inner side of the side wall tying frame, and the horizontal positioning frame and the inner side of the side wall frame are provided with multiple horizontal positioning grooves from top to bottom, and the horizontal positioning grooves are arranged horizontally. The outer facade horizontal steel bars of the outer facade steel bar layer of the side wall and the inner facade horizontal steel bars of the inner facade steel bar layer of the side wall are placed horizontally in the corresponding horizontal positioning grooves, and the side wall frame and the outer facade horizontal steel bars are welded and connected.

5. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 4, characterized in that: When tying the side wall exterior facade steel bar layer and the side wall interior facade steel bar layer, the exterior facade vertical main reinforcement of the side wall exterior facade steel bar layer is connected to the positioning part of the lower layer of the transverse main reinforcement of the bottom plate, and is tied and connected with the exterior facade horizontal reinforcement. Multiple exterior facade vertical reinforcement bars are placed between adjacent exterior facade vertical main reinforcements, and are all tied and connected with the exterior facade horizontal reinforcements.

6. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: A rectangular construction space is provided between two adjacent transverse support beams in the side wall frame, and a scaffolding board is installed between two longitudinally adjacent side wall frames, with both ends of the scaffolding board extending into the corresponding construction space respectively and being erected on the corresponding transverse support beam; Tie the inner facade steel bar layer of the side wall of the side wall steel cage on the scaffolding board, remove the scaffolding board, and weld the diagonal bracing beams between the diagonals of the construction space.

7. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: The top of the top plate binding frame is provided with a top platform plate, and a plurality of top plate lower layer steel bar positioning grooves are arranged in the transverse direction on the top platform plate. The top plate lower layer steel bar positioning grooves are all arranged vertically, and the top plate lower layer longitudinal steel bars in the top plate lower layer steel bar layer are all vertically placed in the corresponding top plate lower layer steel bar positioning grooves.

8. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 7, characterized in that: The top surface of the top platform plate has a transversely arranged support plate, a plurality of the support plates are arranged at intervals in the longitudinal direction, and the lower layer steel bar positioning grooves of the top plate are all located on the support plates; When tying the lower steel bar layer of the top plate, a lower transverse positioning frame of the top plate is installed on the top platform plate, and the lower transverse main bars of the top plate are positioned and laid through the lower transverse positioning frame of the top plate, and the lower half stirrups of the top plate are placed on the top platform plate at intervals in the transverse direction, and the lower longitudinal steel bars of the top plate are laid through the lower steel bar positioning grooves of the top plate, and the lower half stirrups of the top plate are erected, and they are tied together with the lower transverse main bars of the top plate and the lower longitudinal steel bars of the top plate to form the lower steel bar layer of the top plate; The top plate frame is installed on the lower steel bar layer of the top plate. The top plate frame is attached to the vertical steel bars erected from the lower half stirrups of the top plate and is aligned with the transverse main bars of the lower layer of the top plate. The longitudinal steel bars of the lower layer of the top plate are welded to the top plate frame. The upper longitudinal steel bars and the upper transverse steel bars of the top plate are positioned and placed on the top plate frame in sequence, and the upper stirrups of the top plate are installed, and they are tied together with the upper longitudinal steel bars and the upper transverse steel bars of the top plate to form a steel bar layer on the top plate, and a steel bar cage of the bottom plate; Wherein: when installing the roof frame, the lower transverse reinforcement bars of the roof are laid between the lower transverse main bars of the adjacent roof plates, and are tied and connected with the lower half stirrups of the roof plates; The top frame diagonal braces are welded and installed on both sides of the top plate frame in the longitudinal direction, and the top frame diagonal braces are welded and connected to the steel bar layer under the top plate; A plurality of top plate upper steel bar positioning grooves are arranged on the top surface of the top plate frame, the top plate upper longitudinal steel bars are all located in the top plate upper steel bar positioning grooves, and the top plate upper transverse steel bars are all stacked on the top plate upper longitudinal steel bars; The upper transverse reinforcement of the roof slab includes the upper transverse main reinforcement of the roof slab and the upper transverse reinforcing reinforcement of the roof slab. The upper transverse main reinforcement of the roof slab is aligned with the roof slab skeleton and is tied and connected thereto.

9. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 8, characterized in that: The top plate steel cage is divided into an upper chamfered steel cage and a flat-top steel cage, and the top plate frame is divided into an upper chamfered frame and a flat-top frame. The upper chamfered steel cage is tied first, and then the flat-top steel cage is tied. When tying the upper chamfered steel cage, the upper chamfered frame is welded to the side wall frame; when tying the flat-top steel cage, the flat-top frame is welded to the upper chamfered frame.

10. The full-section assembly method of a large-section immersed tube steel bar system in a small dry dock according to claim 1, characterized in that: The truss of the outer formwork trolley is connected to the lower steel bar layer of the top plate of the top plate steel bar cage through steel cables.

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