Beam end deviation adjusting structure for improving flatness of continuous bottom layer of precast beam bridge floor
By setting sawtooth-shaped small box girder structures and cast-in-place adjustable sections for cantilever slabs at the ends of precast beams, combined with reinforcement adjustments, the construction obstacles caused by the sawtooth shape of the precast beams were solved, the flatness of the continuous bottom layer of the bridge deck was achieved, and the construction quality and efficiency were improved.
Patent Information
- Application Number
- CN202520780324.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-23
AI Technical Summary
When precast beams are used in bridges, the ends of the precast beams form a sawtooth shape, which makes it difficult to construct bridge deck paving, bridge deck continuity and expansion joints, and makes it difficult to maintain flatness.
By splicing multiple small box girders at the ends of precast beams to form a sawtooth structure, and providing a rectangular top plate and cantilever plate on each small box girder, extending the cantilever plate at the beam end along the length direction to form a cast-in-place adjustment section, and combining the protruding steel bars and longitudinal portal-shaped steel bars to form a closed portal ring, the deviation at the beam end is adjusted to ensure flatness.
It achieves flatness in both horizontal and vertical sections, providing favorable conditions for bridge deck paving, bridge deck continuity and expansion joint construction, and improving construction efficiency and quality.
Smart Images
Figure CN223951601U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to precast beam bridge construction technology field, especially relate to the beam end deviation adjustment structure for improving the flatness of precast beam bridge deck continuous bottom layer. BACKGROUND
[0002] When the bridge adopts the precast beam, if the road where the bridge is located is located in the widening and skew region, it is necessary to adjust the longitudinal arrangement and overhanging arm line shape of the precast beam to adapt, such as: the axis of several precast beams in one span will not maintain parallel, but present fan-shaped arrangement, since the beam end of each beam is usually perpendicular to the beam axis, the beam ends of several precast beams then form zigzag shape on the plane.
[0003] When the bridge is skew, the axis of several precast beams maintains parallel, since the beam end of each beam is usually perpendicular to the beam axis, the beam ends of several precast beams then form zigzag shape on the plane.
[0004] As shown in the figure, the beam end of the precast beam is the bottom structure of the bridge deck pavement, bridge deck continuity and expansion joint. Figure 1 When the zigzag pattern of the beam ends of several precast beams is relatively severe, it will seriously affect the construction of the bridge deck pavement, bridge deck continuity and expansion joint.
[0005] In practical application, the above zigzag shape needs to be handled on site to maintain flatness on the plane and vertical section, and to provide good conditions for the construction of the bridge deck pavement, bridge deck continuity and expansion joint.
[0006] However, when the bridge adopts the precast beam, the beam end of the precast beam is provided with the overhanging plate, inverted T cover beam and longitudinal bridge deck continuity, how to solve the various obstacles caused by the above "zigzag shape" during construction becomes a technical problem that the technical personnel in the field need to solve urgently. UTILITY MODEL CONTENT
[0007] In view of the above defects of the prior art, the beam end deviation adjustment structure for improving the flatness of the precast beam bridge deck continuous bottom layer is provided, and the purpose is achieved when the bridge adopts the precast beam, the beam end of the precast beam is provided with the overhanging plate, inverted T cover beam and longitudinal bridge deck continuity, the various obstacles caused by the above "zigzag shape" during construction are solved, the flatness on the plane and vertical section is maintained, and good conditions are provided for the construction of the bridge deck pavement, bridge deck continuity and expansion joint.
[0008] To achieve the above object, the utility model discloses a beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of the bridge deck of the prefabricated beam, which is used for the connection between two prefabricated beams, each of the prefabricated beams is formed by splicing a plurality of prefabricated small box girders in the width direction, and the small box girders are staggered in the length direction and form a sawtooth structure on the end face, and each of the small box girders is provided with a rectangular top plate with an area greater than the top edge of the corresponding small box girder, and a cantilevered slab is formed around the corresponding small box girder.
[0009] Wherein, one end of each of the prefabricated beams in the sawtooth structure extends along the length direction of the corresponding prefabricated beam to a beam end cantilevered slab cast-in-place adjustment section in the direction of the cast-in-place diaphragm of the bridge split hole line;
[0010] The thickness of each of the beam end cantilevered slab cast-in-place adjustment section is the same as that of the corresponding cantilevered slab, covers the width range of the corresponding prefabricated beam in the transverse direction, and the narrowest part between the end close to the bridge split hole line and the end of the corresponding prefabricated beam in the sawtooth structure is not less than 0.1m, or at least one set of cast-in-place transverse distribution steel bars can be arranged;
[0011] The end face of each of the cantilevered slab and the corresponding beam end cantilevered slab cast-in-place adjustment section is provided with two layers of corresponding protruding steel bars;
[0012] Each of the protruding steel bars is parallel to the length direction of the corresponding small box girder;
[0013] The end of each pair of corresponding protruding steel bars is provided with a longitudinal door-shaped steel bar, forming a closed door ring shape;
[0014] The end of each of the door ring shapes is close to the bridge split hole line;
[0015] The surface layer of each of the beam end cantilevered slab cast-in-place adjustment sections is provided with a plurality of cast-in-place transverse distribution steel bars in the direction perpendicular to the plane formed by the longitudinal door-shaped steel bars;
[0016] Each of the cast-in-place transverse distribution steel bars is perpendicular to the axis of the corresponding small box girder and is cut off at the end of the corresponding beam end cantilevered slab cast-in-place adjustment section;
[0017] Each of the beam end cantilevered slab cast-in-place adjustment sections is provided with a plurality of top edge pre-embedded door-shaped steel bars along the length direction of the corresponding protruding steel bars at the part more than 0.5m away from the bridge split hole line to the end of the corresponding prefabricated beam in the sawtooth structure;
[0018] Each of the top edge embedded door-shaped steel bars is in inverted "U" shape or "Kang" shape, including an open end and a closed end, the planes formed are parallel to the axis of the corresponding protruding steel bars, the two straight sections of the corresponding open end are perpendicular to the corresponding protruding steel bars, and the end of the two straight sections of the corresponding open end is provided with a right-angle hook, and the two straight sections are bound to the protruding steel bars in the lower layer of the corresponding cantilever slab through the right-angle hooks.
[0019] The position where the two beam end cantilever slab cast-in-place adjustment segments of the two prefabricated beams are connected is provided with a cast-in-place adjustment zone separator.
[0020] Preferably, the rectangular top plates of every two adjacent small box girders are connected through a bridge deck panel wet joint, and end cross beams are arranged between the opposite sides of every two adjacent small box girders.
[0021] Preferably, the root of each protruding steel bar is embedded in the end surface where the corresponding cantilever slab and the corresponding beam end cantilever slab cast-in-place adjustment segment are connected, and the protruding steel bar is extended from the end surface,
[0022] Alternatively, the longitudinal steel bars in the corresponding cantilever slab are directly extended from the end surface where the corresponding cantilever slab and the corresponding beam end cantilever slab cast-in-place adjustment segment are connected.
[0023] Preferably, the part of each protruding steel bar extended from the end surface where the corresponding cantilever slab and the corresponding beam end cantilever slab cast-in-place adjustment segment are connected is provided with a reserved welding length in the longitudinal direction.
[0024] Preferably, each longitudinal door-shaped steel bar is in inverted "U" shape or "Kang" shape, and the two ends are fixed to the corresponding pair of upper and lower protruding steel bars through welding, the width of the longitudinal door-shaped steel bar matches the spacing between the corresponding pair of upper and lower protruding steel bars, and the length of the longitudinal door-shaped steel bar matches the width of the corresponding position of the beam end cantilever slab cast-in-place adjustment segment.
[0025] Preferably, the cast-in-place adjustment zone separator has the same thickness as the corresponding beam end cantilever slab cast-in-place adjustment segment, the longitudinal thickness along the length direction of each small box girder is 2cm to 5cm, the cast-in-place adjustment zone separator is made of rubber plate, and the cast-in-place adjustment zone separator is removed after the construction of the corresponding beam end cantilever slab cast-in-place adjustment segment is completed.
[0026] The beneficial effects of the utility model are as follows:
[0027] The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0028] The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0030] Figure 2 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0031] Figure 3 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0032] Figure 4 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0033] Figure 5 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0034] Figure 6 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint. DETAILED DESCRIPTION
[0035] EMBODIMENT
[0036] As Figures 2 to 6 The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0037] The utility model discloses a bridge type that the precast beam is adopted on the bridge, the beam end of the precast beam is with the cantilevered slab, the inverted T roof beam, and the longitudinal bridge deck is continuous, and when the bridge type is adopted, the various obstacles caused by the "sawtooth" in the construction are solved, the flatness is kept on the plane and the vertical section, and good conditions are provided for the bridge deck pavement, the bridge deck continuity and the construction of expansion joint.
[0038] The thickness of each beam end cantilever plate cast-in-place adjusting section 4 is same with the corresponding cantilever plate 3, covers the width range of the corresponding precast beam 1 in the transverse direction, and the narrowest part between the end of the corresponding precast beam 1 in the zigzag structure and the end close to the bridge hole line 5 is not less than 0.1 m, or at least one set of cast-in-place transverse distribution steel bars 41 can be arranged;
[0039] The end surface of each cantilever plate 3 and the corresponding beam end cantilever plate cast-in-place adjusting section 4 is provided with two layers of corresponding protruding steel bars 31;
[0040] Each protruding steel bar 31 is parallel to the length direction of the corresponding small box girder 2;
[0041] The end part of each pair of upper and lower corresponding protruding steel bars 31 is provided with a longitudinal door-shaped steel bar 42, forming a closed door ring shape;
[0042] The end part of each door ring shape is close to the bridge hole line 5;
[0043] The surface layer of each beam end cantilever plate cast-in-place adjusting section 4 is provided with a plurality of cast-in-place transverse distribution steel bars 41 in the direction perpendicular to the plane formed by the longitudinal door-shaped steel bar 42;
[0044] Each cast-in-place transverse distribution steel bar 41 is perpendicular to the axis 7 of the corresponding small box girder 2 and is cut off at the end of the corresponding beam end cantilever plate cast-in-place adjusting section 4;
[0045] The part of each beam end cantilever plate cast-in-place adjusting section 4, which is more than 0.5 m away from the bridge hole line 5 to the end of the zigzag structure of the corresponding precast beam 1, is provided with a plurality of top edge pre-buried door-shaped steel bars 43 along the length direction of the corresponding protruding steel bar 31;
[0046] Each top edge pre-buried door-shaped steel bar 43 is in an inverted "U" shape or a "H" shape, including an open end and a closed end, the planes formed by the two are parallel to the axis of the corresponding protruding steel bar 31, the two straight sections of the corresponding open end are perpendicular to the corresponding protruding steel bar 31, and the end parts of the two straight sections of the corresponding open end are provided with right-angle hooks and are bound to the lower layer protruding steel bar 31 in the corresponding cantilever plate 3 through the corresponding right-angle hooks, and the corresponding closed end is exposed at the top edge of the corresponding beam end cantilever plate cast-in-place adjusting section 4 and is parallel to the longitudinal steel bar in the corresponding cantilever plate 3;
[0047] The position where the two beam end cantilever plate cast-in-place adjusting sections 4 of the two precast beams 1 are connected is provided with a cast-in-place adjusting belt separator 6.
[0048] The beam end cantilever plate cast-in-place adjusting section 4 in the utility model can adjust the zigzag state of the multiple precast beam ends when the width is changed or the intersection is changed, form a better flat state, and is beneficial to the implementation of the bridge deck, expansion joint and other structures.
[0049] The utility model discloses a stretch out reinforcing steel bar 31 set up by the cantilevered slab 3 makes the construction more convenient, can provide the convenience for the steel anchoring of the beam end cantilevered slab cast-in-place adjustment section 4, and completely has the implementability.
[0050] The length of the longitudinal door-shaped reinforcing steel bar 42 can be adjusted according to actual needs, and the longitudinal door-shaped reinforcing steel bar 42 can adapt to the scenario that the beam end cantilevered slab cast-in-place adjustment section 4 has different widths in the zigzag shape.
[0051] The cast-in-place belt transverse distribution reinforcing steel bar 41 can provide the surface layer anti-cracking effect for the beam end cantilevered slab cast-in-place adjustment section 4.
[0052] The cast-in-place adjustment belt partition 6 can make the cantilevered slab 3 of the two adjacent precast beams 1 in the longitudinal direction keep independent in structure, and ensure that the continuous layer of the bridge deck can work normally.
[0053] The top edge pre-buried door-shaped reinforcing steel bar 43 of the beam end cantilevered slab cast-in-place adjustment section 4 can cope with the situation that the zigzag width is too large, ensure that the longitudinal length of the isolation section of the continuous layer of the bridge deck does not exceed the design value, and make the stress of the continuous layer of the bridge deck keep within a reasonable range.
[0054] In some embodiments, the rectangular top plates of every two adjacent small box girders 2 are connected through the deck slab wet joint 22; and the side faces of every two adjacent small box girders 2 are provided with the end cross beam 23.
[0055] In some embodiments, the root of each stretch out reinforcing steel bar 31 is pre-buried in the end face where the corresponding cantilevered slab 3 and the corresponding beam end cantilevered slab cast-in-place adjustment section 4 are connected, and the stretch out reinforcing steel bar 31 is stretched out from the end face where the corresponding cantilevered slab 3 and the corresponding beam end cantilevered slab cast-in-place adjustment section 4 are connected,
[0056] Alternatively, the longitudinal reinforcing steel bars in the corresponding cantilevered slab 3 are directly stretched out from the end face where the corresponding cantilevered slab 3 and the corresponding beam end cantilevered slab cast-in-place adjustment section 4 are connected.
[0057] In some embodiments, the part of each stretch out reinforcing steel bar 31 stretched out from the end face where the corresponding cantilevered slab 3 and the corresponding beam end cantilevered slab cast-in-place adjustment section 4 are connected has a welding length that meets the requirements.
[0058] In some embodiments, each longitudinal door-shaped reinforcing steel bar 42 is in the shape of inverted "U" or " ", and the two ends are fixed with a corresponding pair of upper and lower corresponding stretch out reinforcing steel bars 31 through welding, the width of the longitudinal door-shaped reinforcing steel bar 42 matches the spacing between the corresponding pair of upper and lower corresponding stretch out reinforcing steel bars 31, and the length of the longitudinal door-shaped reinforcing steel bar 42 matches the width of the corresponding position of the beam end cantilevered slab cast-in-place adjustment section 4.
[0059] In actual application, the arrangement direction of each longitudinal door-shaped reinforcing steel bar 42 is the same as the stretch out reinforcing steel bar 31 pre-buried in the cantilevered slab 3, so that the corresponding pair of upper and lower corresponding stretch out reinforcing steel bars 31 form a closed door-shaped ring.
[0060] In some embodiments, the cast-in-place adjustment strip 6 has the same thickness as the corresponding cast-in-place adjustment section 4 of the beam end cantilever slab, and has a longitudinal thickness of 2-5 cm along the length direction of each small box girder 2. The cast-in-place adjustment strip 6 is made of rubber plate and is removed after the construction of the corresponding cast-in-place adjustment section 4 of the beam end cantilever slab.
[0061] The preferred embodiments of the present application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative efforts based on the concept of the present application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the existing technology within the concept of the present application shall be within the protection scope defined by the claims.
Claims
1. A beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck, used for the connection between two precast beams (1); each precast beam (1) is formed by splicing multiple precast small box girders (2) sequentially along the width direction, and each pair of adjacent small box girders (2) are staggered along the length direction, forming a sawtooth structure on the end face; each small box girder (2) is provided with a rectangular top plate with an area larger than the top edge (21) of the corresponding small box girder (2), and cantilever plates (3) are formed around the corresponding small box girder (2); characterized in that, Each of the precast beams (1) has a sawtooth structure at one end, which extends along the length of the corresponding precast beam (1) towards the direction of the cast-in-place strip separator of the bridge span line (5). The cast-in-place adjustment section (4) of the beam end cantilever plate extends along the length of the corresponding precast beam (1). The thickness of each of the cast-in-place adjustment sections (4) of the cantilever plate at the beam end is the same as that of the corresponding cantilever plate (3), and it covers the width range of the corresponding precast beam (1) laterally. The narrowest point between the end near the bridge span line (5) and the end of the corresponding precast beam (1) with a sawtooth structure is not less than 0.1m, or it can meet the requirement of setting at least one set of cast-in-place strip transversely distributed steel bars (41). Each of the cantilever slabs (3) and the corresponding cast-in-place adjustment section (4) of the beam end cantilever slab are provided with two layers of corresponding protruding reinforcing bars (31); Each of the protruding reinforcing bars (31) is parallel to the length direction of the corresponding small box girder (2); Each pair of corresponding protruding reinforcing bars (31) is provided with longitudinal portal-shaped reinforcing bars (42) at its end, forming a closed portal ring; Each of the aforementioned gate rings is located close to the bridge span line (5); The surface layer of each of the cast-in-place adjustable sections (4) of the beam end cantilever slab is provided with a number of transversely distributed reinforcing bars (41) along the direction perpendicular to the plane formed by the longitudinal portal-shaped reinforcing bars (42); Each of the transverse reinforcing bars (41) of the cast-in-place strip is perpendicular to the axis (7) of the corresponding small box girder (2) and terminates at the end of the cast-in-place adjustment section (4) of the corresponding beam end cantilever plate; Each of the above-mentioned beam end cantilever plate cast-in-place adjustment sections (4) has several top edge pre-embedded gate-shaped steel bars (43) in the part from the bridge span line (5) more than 0.5m away to the sawtooth structure end of the corresponding precast beam (1). Each of the top-edge embedded door-shaped steel bars (43) is in an inverted "U" shape or a "冂" shape, including an open end and a closed end. The plane formed is parallel to the axis of the corresponding extended steel bar (31). The two straight segments of the corresponding open end are perpendicular to the corresponding extended steel bar (31), and the ends of the two straight segments of the corresponding open end are each provided with a right-angle hook, and are each tied to the extended steel bar (31) located in the lower layer in the corresponding cantilever slab (3) through the corresponding right-angle hook. The corresponding closed end is exposed at the top edge of the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab, and is parallel to the longitudinal steel bars in the corresponding cantilever slab (3); A cast-in-place adjustment belt separator (6) is provided at the joint position between the two cast-in-place adjustment sections (4) of the beam-end cantilever slabs of the two precast beams (1).
2. The beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck according to claim 1, characterized in that, The rectangular top plates of every two adjacent small box girders (2) are connected through a deck wet joint (22); end cross beams (23) are provided between the opposite side surfaces of every two adjacent small box girders (2).
3. The beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck according to claim 1, characterized in that, The root of each extended steel bar (31) is embedded in the end face where the corresponding cantilever slab (3) is connected to the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab, and extends from the end face where the corresponding cantilever slab (3) is connected to the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab, or, the longitudinal steel bars in the corresponding cantilever slab (3) are directly used to extend from the end face where the corresponding cantilever slab (3) is connected to the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab.
4. The beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck according to claim 1, characterized in that, The part of each extended steel bar (31) extending from the end face where the corresponding cantilever slab (3) is connected to the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab reserves a welding length that meets the requirements longitudinally.
5. The beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck according to claim 1, characterized in that, Each longitudinal door-shaped steel bar (42) is in an inverted "U" shape or a "冂" shape, and the two ends are respectively fixed to the corresponding pair of upper and lower corresponding extended steel bars (31) by welding. The width matches the spacing between the corresponding pair of upper and lower corresponding extended steel bars (31), and the length matches the width of the corresponding position of the cast-in-place adjustment section (4) of the beam-end cantilever slab to which it belongs.
6. The beam end deviation adjustment structure for improving the flatness of the continuous bottom layer of a precast beam bridge deck according to claim 1, characterized in that, The thickness of the cast-in-place adjustment belt separator (6) is the same as that of the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab. The longitudinal thickness along the length direction of each small box girder (2) is 2 cm to 5 cm. It is made of a rubber plate and is removed after the construction of the corresponding cast-in-place adjustment section (4) of the beam-end cantilever slab is completed.