Cantilever cap beam construction system and construction method

Abstract

This invention relates to a cantilever bridge girder construction system and method, belonging to the field of bridge construction. The cantilever bridge girder construction includes: a support rod, a lower support structure, a middle support structure, and an upper support structure. The support rod penetrates the pier. The lower support structure includes two upper chords and two lower chords, which are parallel and horizontally arranged. The two lower chords are respectively located below the two upper chords. The two lower chords are supported by the support rod extending from both ends of the pier, and the lower chords support the upper chords. The middle support structure includes multiple Bailey bridges, which are parallel and spaced apart, with any two adjacent Bailey bridges connected to each other. The middle structure is rectangular, and the middle support structure fits over the pier and is supported by the lower support structure. The upper support structure is rectangular, and the upper support structure fits over the pier and is supported by the middle support structure.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and in particular relates to a cantilever cap beam construction system and construction method. Background Technology

[0002] A cap beam is a horizontal beam installed on top of a pier or pile frame to support, distribute, and transfer the loads of the superstructure. It is a reinforced concrete or lightly reinforced concrete beam installed on the pier or pile frame. Cap beams are a very important component of bridges.

[0003] When constructing cantilever cap beams, platforms need to be built on the bridge piers before construction can proceed. In existing technologies, one end of the platform is often connected to the bridge pier, and the other end is secured to the pier using ropes. However, because the ropes are soft, this structure is prone to swaying both during and after platform construction, posing a safety hazard. Furthermore, the construction process is complex, cumbersome, and inefficient. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cantilever bridge pier construction system and method. The system uses support rods to support the lower support structure, which in turn supports the middle support structure, and the middle support structure supports the upper support structure. The entire construction system can be stably installed and fixed on the bridge pier. The lower, middle, and upper support structures are installed on the bridge pier sequentially, thus solving the technical problem of work efficiency in the prior art.

[0005] This invention provides a cantilever cap beam construction system, comprising:

[0006] Support rod, the support rod being used to penetrate the bridge pier;

[0007] The lower support structure includes two upper chords and two lower chords, which are parallel to each other and horizontally arranged. The two lower chords are respectively located below the two upper chords. The two lower chords are supported by the support rods extending from both ends of the pier, and the lower chords support the upper chords.

[0008] The middle support structure includes multiple Bailey bridge frames, which are parallel to each other and spaced apart, and any two adjacent Bailey bridge frames are connected to each other; the middle support structure is rectangular, and the middle support structure is fitted over the pier and supported on the lower support structure;

[0009] The upper support structure is rectangular and is fitted over the bridge pier and supported on the middle support structure.

[0010] In this technical solution, support rods support the lower support structure, the lower support structure supports the middle support structure, and the middle support structure supports the upper support structure. These layers of support structures are stacked, and since there are no flexible materials, the structure is stable. Furthermore, the lower, middle, and upper support structures are nested within the bridge piers. During installation, the lower, middle, and upper support structures are simply nested onto the bridge piers sequentially, making erection convenient and quick, and improving work efficiency.

[0011] In some embodiments, the support rods are at least two, and the two support rods are parallel and located at the same height.

[0012] In the technical solution, multiple support rods support the lower support structure, further improving the stability of the lower support structure on the pier, thereby enhancing the overall stability of the cantilever cap beam construction system.

[0013] In some embodiments, the end of the support rod extending out of the pier is provided with a support member, the support member including a pressure plate and a support plate, the support plate being horizontally disposed above the corresponding support rod, the pressure plate being fixed below the support plate, and the pressure plate having a clearance groove for placing the support rod.

[0014] In the technical solution, the support rod and the lower chord in the lower support structure are connected by a support member to prevent the lower support structure from slipping off the support rod, thereby further improving the overall stability of the structure.

[0015] In some embodiments, the upper support structure includes multiple scaffolds and guardrails, with the multiple scaffolds spliced ​​together to form a rectangular platform, and the guardrails arranged along the edge of the platform to form an enclosing structure.

[0016] In the technical solution, the scaffolding is a standard component, making its procurement and installation convenient. Guardrails prevent construction workers from falling, further improving safety.

[0017] In some embodiments, the lower support structure further includes a plurality of connecting rods disposed between the upper chord and the lower chord, with both ends of the connecting rods connected to the upper chord and the lower chord, respectively.

[0018] In the technical solution, the connecting rod supports the upper and lower chords to facilitate construction and increase the height of the lower support structure, thereby increasing the overall height of the cantilever beam construction system and facilitating personnel to construct the cantilever beam on the top of the bridge pier.

[0019] This invention also discloses a method for constructing cantilever cap beams, used to build the cantilever cap beam construction system described above, comprising the following steps:

[0020] Establish a support structure: drill multiple through holes in the bridge piers, and insert the support rods through the through holes;

[0021] Establish the lower support structure: weld the upper chord, lower chord, and connecting rods on the ground to form the structure;

[0022] Establish the intermediate support structure: On the ground, multiple Bailey panels are spliced ​​together to form a Bailey frame, and multiple Bailey frames are spliced ​​together to form a rectangular structure;

[0023] Establish the upper support structure: connect multiple scaffolding sections on the ground to form a rectangular structure;

[0024] Install the lower support structure: hoist the lower support structure and move it above the pier, then lower the lower support structure so that it fits over the pier and is supported by the end of the support rod;

[0025] Install the middle support structure: lift the middle support structure and move it above the pier, then lower the middle support structure so that it fits over the pier and is placed above the lower support structure;

[0026] Install the upper support structure: lift the upper support structure and move it above the pier, then lower the upper support structure so that it fits over the pier and is placed above the middle support structure.

[0027] In the technical solution, the lower support structure, middle support structure and upper support structure are first assembled on the ground, and then installed in sequence by hoisting. The operation is convenient, greatly reduces the number of operation steps and improves work efficiency.

[0028] In some embodiments, the step of establishing the support structure after inserting the support rod through the through hole further includes: placing the support member at the end of the corresponding support rod, placing the support rod in the relief groove, and placing the support plate above the corresponding support rod and setting it horizontally.

[0029] In the technical solution, the stability of the connection between the lower chord and the support rod is improved by using support members, thereby enhancing the stability of the structure.

[0030] In some embodiments, the specific steps of lowering the lower support structure so that it covers the pier and is supported by the end of the support rod during the installation of the lower support structure are as follows: placing the lower surface of the lower chord on the corresponding support plate.

[0031] In some embodiments, the steps following the installation of the upper support structure further include welding guardrails along the edge of the upper surface of the platform.

[0032] In some embodiments, the step of placing the support rod after the relief groove in the establishment of the support structure further includes tightening a lock nut at the end of the support rod, the lock nut pressing the corresponding pressure plate against the pier.

[0033] In the technical solution, locking nuts are used to fix the support member and the support rod, thereby improving the connection strength between the support frame and the support rod, and thus improving the connection strength between the lower support structure and the support rod.

[0034] Based on the above technical solution, in this embodiment of the invention, the support rod supports the lower support structure, the lower support structure supports the middle support structure, and the middle support structure supports the upper support structure. The lower, middle, and upper support structures are stacked, and since there is no soft material, the structure is stable. Furthermore, the lower, middle, and upper support structures are fitted onto the bridge piers, further improving their stability and preventing the cantilever cap beam construction system from swaying and causing danger. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the cantilever cap beam construction system of the present invention;

[0037] Figure 2 This is a schematic diagram of a support member according to an embodiment of the cantilever beam construction system of the present invention;

[0038] Figure 3 This is a cross-sectional schematic diagram of a bridge pier according to an embodiment of the cantilever cap beam construction system of the present invention;

[0039] Figure 4 This is a partial structural schematic diagram of a Bailey bridge in one embodiment of the cantilever cap beam construction system of the present invention;

[0040] Figure 5 This is a flowchart of one embodiment of the cantilever cap beam construction method of the present invention.

[0041] In the picture:

[0042] 100. Pier; 200. Support rod; 300. Support component; 301. Pressure plate; 302. Relief groove; 303. Support plate; 304. Rib plate; 400. Frustum nut; 500. Steel pipe; 600. First rubber pad; 700. Second rubber pad; 800. Lower support structure; 801. Lower chord; 802. Upper chord; 803. Connecting rod; 900. Bailey bridge; 110. Crossbeam; 120. Square timber; 130. Scaffolding; 140. Guardrail; 150. Locking nut. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] As attached Figures 1 to 4As shown, in an illustrative embodiment of the cantilever bridge girder construction system method of the present invention, the cantilever bridge girder construction system includes: a support rod 200, a lower support structure 800, a middle support structure, and an upper support structure, wherein the support rod 200 is used to penetrate the pier 100; the lower support structure 800 includes two upper chords 802 and two lower chords 801, the upper chords 802 and lower chords 801 are parallel to each other and horizontally arranged, and the two lower chords 801 are respectively arranged below the two upper chords 802; The lower chord 801 is supported by support rods 200 extending from both ends of the pier 100, and the lower chord 801 supports the upper chord 802. The middle support structure includes multiple Bailey bridges 900, which are parallel to each other and spaced apart, with any two adjacent Bailey bridges 900 connected to each other. The middle structure is rectangular and is fitted over the pier 100 and supported on the lower support structure 800. The upper support structure is rectangular and is fitted over the pier 100 and supported on the middle support structure. The support rods 200 support the lower support structure 800, the lower support structure 800 supports the middle support structure, and the middle support structure supports the upper support structure. The lower support structure 800, the middle support structure, and the upper support structure are stacked, and since there is no soft material, the structure is stable. Furthermore, the lower support structure 800, the middle support structure, and the upper support structure are all fitted onto the piers 100, further improving its stability and preventing the cantilever cap beam construction system from swaying and causing danger. The lower support structure 800, the middle support structure, and the upper support structure can be sequentially fitted onto the piers, making the operation convenient and efficient.

[0048] Specifically, the support rod 200 is made of steel, and the diameter of the support rod 200 is selected according to the requirements. The greater the weight it bears, the larger the diameter of the support rod 200.

[0049] As attached Figures 1 to 4 As shown, in one embodiment, the pier 100 is hollow, with a through hole for the support rod 200 to pass through. A frustum nut 400 is provided inside the pier 100 corresponding to the through hole, and the frustum nut 400 communicates with the corresponding through hole. A steel pipe 500 is also connected to the side of each frustum nut 400 away from the corresponding inner wall of the pier 100, and the steel pipe 500 communicates with the corresponding through hole. When the support rod 200 passes through the through hole, it also passes through the frustum nut 400 and the steel pipe 500, further connecting the pier 100 and the support rod 200 through the steel pipe 500 and the frustum nut 400, thus improving the support effect.

[0050] In one embodiment, the support rods 200 are at least two, and the two support rods 200 are parallel and located at the same height. The multiple support rods 200 support the lower support structure 800, further improving the stability of the lower support structure 800 on the pier 100, thereby improving the overall stability of the cantilever cap beam construction system.

[0051] As attached Figures 1 to 4 As shown, in one embodiment, each end of the support rod 200 extending out of the pier 100 is provided with a support member 300. The support member 300 includes a pressure plate 301 and a support plate 303. The support plate 303 is horizontally positioned above the corresponding support rod 200, and the pressure plate 301 is fixed below the support plate 303. The pressure plate 301 has a clearance groove 302 for placing the support rod 200. The support member 300 connects the support rod 200 and the lower chord 801 in the lower support structure 800, preventing the lower support structure 800 from slipping off the support rod 200 and further improving the overall stability of the structure.

[0052] Specifically, the clearance groove 302 passes through the pressure plate 301; and when the support plate 303 is horizontal and the pressure plate 301 is located below the support plate 303, the support plate 303 is perpendicular to the pressure plate 301, and the clearance groove 302 passes through the bottom end of the pressure plate 301. This facilitates placing the support rod 200 in the clearance groove 302.

[0053] In one embodiment, the pressure plate 301 is provided with a plurality of reinforcing ribs, one side of which is connected to the pressure plate 301 and the top of which is connected to the support plate 303, thereby improving the overall strength of the structure.

[0054] As attached Figures 1 to 4 As shown, in one embodiment, a first rubber pad 600 is provided between the support member 300 and the pier 100 to prevent scratches on the pier 100 and affect its appearance. Furthermore, the top of the first rubber pad 600 extends above the lower chord 801, and the lower chord 801 is also separated from the pier 100 by the first rubber pad 600.

[0055] In one embodiment, a second rubber pad 700 is provided between the upper chord 802 and the pier 100 to prevent the upper chord 802 from scratching the pier 100.

[0056] In one embodiment, the end of the support rod 200 extending out of the pier 100 has a threaded section, and the end of the support rod 200 is threadedly connected to a locking nut 150. The locking nut 150 connects to the support rod 200 to press the pressure plate 301 against the pier 100, preventing the pressure plate 301 from detaching from the pier 100, which would cause the support member 300 to detach and cause the cantilever cap beam construction system to tilt, thereby improving the stability of the structure, reducing safety hazards, and improving safety.

[0057] Specifically, a pressure block is also provided between the locking bolt and the pier 100, and the support rod 200 is sleeved on the pressure block. A locking block is also provided on the pressure plate 301. The pressure block is a rectangular block. When the pressure block abuts against the pressure plate 301, one side wall of the pressure block is attached to the side wall of the locking block. At this time, the pressure block cannot rotate and can only move along the axial direction of the support rod 200. The pressure block is then pressed by the locking bolt to prevent the support rod 200 or the locking nut 150 from rotating due to vibration, and to prevent the locking nut 150 from disengaging from the support rod 200, thereby further improving the stability of the structure.

[0058] In one embodiment, a reinforcing mesh is fixed at the through hole to improve the structural strength of the through hole and reduce wear between the support rod 200 and the pier 100.

[0059] As attached Figures 1 to 4 As shown, in one embodiment, the lower support structure 800 further includes multiple connecting rods 803, which are disposed between the upper chord 802 and the lower chord 801, with both ends of the connecting rods 803 connected to the upper chord 802 and the lower chord 801 respectively. The connecting rods 803 support the upper chord 802 and the lower chord 801 to facilitate construction and increase the height of the lower support structure 800, thereby increasing the overall height of the cantilever beam construction system and facilitating the construction of the cantilever beam on the top of the pier 100.

[0060] Specifically, the multiple connecting rods 803 are arranged vertically or at an angle, with at least one at an angle between two vertically arranged connecting rods 803, and any two adjacent connecting rods 803 forming an angle to form a triangular structure, thereby improving the stability of the lower support structure 800.

[0061] More specifically, some connecting rods 803 are horizontal, with each end of the connecting rod 803 connected to two upper chord rods 802, or each end of the connecting rod 803 connected to two lower chord rods 801, so that the two upper chord rods 802 and the two lower chord rods 801 form a whole.

[0062] As attached Figures 1 to 4 As shown, in one embodiment, the Bailey bridge 900 is composed of multiple Bailey panels, which are connected sequentially in a single direction to form an elongated Bailey bridge 900. The length direction of the Bailey bridge 900 is along the length direction of the upper chord 802, and the width direction of the Bailey bridge 900 is vertical.

[0063] In one embodiment, a plurality of crossbeams 110 are further provided between the lower support structure 800 and the middle support structure. The crossbeams 110 are horizontally arranged and their length direction is perpendicular to the upper chord 802. The multiple crossbeams 110 are spaced apart along the length direction of the upper chord 802. Multiple Bailey bridges 900 are placed above the crossbeams 110. The crossbeams 110 support the Bailey bridges 900, reducing the difficulty of installation and improving the stability of the structure.

[0064] Specifically, bolts pass through the crossbeam 110 to connect the scaffolding to the upper chord 802.

[0065] As attached Figures 1 to 4 As shown, in one embodiment, the upper support structure includes multiple scaffolding sections and guardrails 140. The multiple scaffolding sections are joined to form a rectangular platform, and the guardrails 140 are arranged along the edges of the platform to form an enclosing structure. The scaffolding sections are standard components, making them convenient to purchase and install. The guardrails 140 prevent construction workers from falling, further improving safety.

[0066] Specifically, the scaffolding uses a cup-lock bracket system, which has a simple structure, is easy to install, and improves work efficiency.

[0067] As attached Figures 1 to 4 As shown, in one embodiment, the upper support structure further includes a plurality of square timbers 120, which are disposed above the Bailey bridge 900 in the middle support structure. Scaffolding is disposed above a portion of the Bailey bridge 900 and above the scaffolding.

[0068] Specifically, multiple square timbers 120 are respectively placed at both ends of the Bailey bridge 900. That is, the upper surface of the completed scaffolding has a shape that is lower in the middle and higher on both sides.

[0069] More specifically, wooden planks are laid on top of the scaffolding to facilitate workers' movement.

[0070] Through the description of several embodiments of the cantilever girder construction system of the present invention, it can be seen that the embodiments of the cantilever girder construction system of the present invention have at least one or more of the following advantages:

[0071] 1. Support rod 200 supports lower support structure 800, lower support structure 800 supports middle support structure, middle support structure supports upper support structure. The lower support structure 800, middle support structure and upper support structure are stacked. Since there is no soft material, the structure is stable.

[0072] 2. One side wall of the pressure block is attached to the side wall of the clamping block. At this time, the pressure block cannot rotate but can only move along the axial direction of the support rod 200. Then, the pressure block is pressed by the locking bolt to avoid vibration causing the support rod 200 or the locking nut 150 to rotate, and to prevent the locking nut 150 from disengaging from the support rod 200, thereby further improving the stability of the structure.

[0073] Please refer to Figure 5 The present invention also discloses a cantilever cap beam construction method for constructing the cantilever cap beam construction system as described above, comprising the following steps:

[0074] S100 establishes a support structure: multiple through holes are made in the pier 100, and support rods 200 are installed inside the through holes;

[0075] S200 establishes a lower support structure 800: the upper chord 802, lower chord 801 and connecting rod 803 are welded on the ground to form a structure;

[0076] S300 establishes a middle-level support structure: multiple Bailey panels are spliced ​​together on the ground to form a Bailey frame 900, and multiple Bailey frames 900 are spliced ​​together to form a rectangular structure;

[0077] S400 establishes an upper support structure: multiple scaffolding sections are spliced ​​together on the ground to form a rectangular structure;

[0078] S500 Installation of lower support structure 800: Lift the lower support structure 800 and move it above the pier 100, then lower the lower support structure 800 so that the lower support structure 800 fits onto the pier 100 and is supported by the end of the support rod 200.

[0079] S600 Installation of the middle support structure: Lift the middle support structure and move it above the pier 100, then lower the middle support structure so that it fits over the pier 100 and is placed above the lower support structure 800.

[0080] S700 Installation of Upper Support Structure: The upper support structure is hoisted and moved above pier 100, then lowered so that it fits over pier 100 and is placed above the middle support structure. The lower support structure 800, middle support structure, and upper support structure are first assembled on the ground, and then installed sequentially by hoisting. This method is convenient, greatly reduces operational steps, and improves work efficiency.

[0081] In one embodiment, the step of establishing the support structure in step S100, before inserting the support rod 200 through the through hole, further includes: drilling a through hole in the pier 100 using an electric drill; manually entering the pier 100; and installing a frustum nut 400 inside the pier 100, with the frustum nut 400 communicating with the corresponding through hole. A steel pipe 500 is then manually inserted into the frustum nut 400.

[0082] In one embodiment, after inserting the support rod 200 through the through hole in step S100 of establishing the support structure, the step further includes: fitting a first rubber pad 600 onto the end of the support rod 200 extending out of the pier 100. The support member 300 is placed at the end of the corresponding support rod 200, and the support rod 200 is placed in the relief groove 302 of the pressure plate 301. The support plate 303 is manually adjusted to position it above the corresponding support rod 200 and horizontally. The support member 300 improves the stability of the connection between the lower chord 801 and the support rod 200, thereby improving the stability of the structure.

[0083] In one embodiment, after placing the support plate 303 horizontally above the corresponding support rod 200 in step S100 of establishing the support structure, the step further includes fitting a pressure block onto the support plate 303, pressing the pressure block against the pressure plate 301, with one side of the pressure block abutting the side wall of the clamping block. Tighten the locking nut 150 at the end of the support rod 200, which presses the corresponding clamping block against the pressure plate 301. Continue tightening the locking nut 150 to press the pressure plate 301 against the pier 100. The locking nut 150 fixes the support member 300 to the support rod 200, improving the connection strength between the support frame and the support rod 200, thereby improving the connection strength between the lower support structure 800 and the support rod 200.

[0084] In one embodiment, step S200, which establishes the lower support structure 800, involves welding the upper chord 802, lower chord 801, and connecting rod 803 to form the structure on the ground. The specific steps are as follows: two lower chords 801 are placed parallel to each other on the ground; a connecting rod 803 is welded between the two lower chords 801; a connecting rod 803 is welded to the upper surface of the lower chord 801; an upper chord 802 is placed above the corresponding lower chord 801; and the upper chord 802 is welded to the corresponding connecting rod 803. A connecting rod 803 is then welded between the two upper chords 802.

[0085] In one embodiment, step S300 establishes a middle-layer support structure by splicing multiple Bailey panels on the ground to form a Bailey frame 900. The specific steps for splicing multiple Bailey frames 900 to form a rectangular structure are as follows: multiple Bailey panels are connected sequentially along a single direction to form a long strip-shaped Bailey frame 900.

[0086] In one embodiment, the specific steps of establishing the upper support structure in step S400, which involves splicing multiple scaffolds together on the ground to form a rectangular structure, are as follows: multiple square timbers 120 are prefabricated on the ground, with the square timbers 120 spaced apart, and scaffolding is erected above the square timbers 120.

[0087] In one embodiment, before the lower support structure 800 is installed in step S500 and the lower support structure 800 is lowered, a second rubber pad 700 is attached to the pier 100. The position of the second rubber pad 700 corresponds to the position of the upper chord 802 after the lower support structure 800 is installed.

[0088] In one embodiment, the specific steps of installing the lower support structure 800 in step S500 and lowering the lower support structure 800 so that the lower support structure 800 fits over the pier 100 and is supported by the end of the support rod 200 are as follows: the lower surface of the lower chord 801 is placed above the corresponding support plate 303.

[0089] In one embodiment, in step S500, after placing the lower surface of the lower chord 801 above the corresponding support plate 303, the following steps are performed: the reinforcing bars are passed through the two upper chords 802 and the pier 100, with both ends of the reinforcing bars passing through the upper chords 802 and nuts tightened at both ends of the reinforcing bars passing through the upper chords 802. The nuts allow the two upper chords 802 to be tightly attached to the pier 100, thereby improving the stability of the structure.

[0090] In one embodiment, the specific steps for installing the intermediate support structure in step S600, lifting the intermediate support structure and moving it above the pier 100, and lowering the intermediate support structure so that it fits over the pier 100 and is placed above the lower support structure 800 are as follows: Multiple crossbeams 110 are lifted and placed above the upper chord 802. The crossbeams 110 are horizontally positioned and their length direction is perpendicular to the upper chord 802. The multiple crossbeams 110 are spaced apart along the length direction of the upper chord 802. The Bailey bridge 900 is lifted and placed above the crossbeams 110. The length direction of the Bailey bridge 900 is along the length direction of the upper chord 802, and the width direction of the Bailey bridge 900 is vertical.

[0091] In other embodiments, for the stability of the Bailey bridge 900, after the Bailey bridge 900 is placed above the crossbeam 110, the crossbeam 110 and the Bailey bridge 900 are connected to the corresponding upper chord 802 by bolts.

[0092] In one embodiment, the specific steps for installing the upper support structure in step S700, lifting and moving the upper support structure above the pier 100, and lowering the upper support structure so that it fits over the pier 100 and is placed above the middle support structure are as follows: The timber 120 is lifted multiple times, placed above the corresponding Bailey bridge 900, and the timber 120 is placed at both ends above the middle support structure, with the timber 120 at both ends symmetrically arranged. The scaffolding is then lifted, placed above the pier 100, with the hollow portion of the scaffolding aligned with the pier 100, and the scaffolding is lowered, placing it above the timber 120 and the Bailey bridge 900.

[0093] In one embodiment, the top of the scaffolding is flush with the top of the pier 100.

[0094] In one embodiment, the top surface of the scaffolding is the same as the bottom surface of the cantilever cap beam to be constructed.

[0095] In one embodiment, the steps following step S700, which involves installing the upper support structure, further include laying wooden planks on the upper surface of the scaffold to facilitate walking.

[0096] In one embodiment, the steps following step S700, which involves installing the upper support structure, further include welding guardrail 140 along the edge of the upper surface of the platform.

[0097] Through the description of several embodiments of the cantilever cap beam construction system of the present invention, it can be seen that the embodiments of the cantilever cap beam construction system of the present invention have at least one of the following advantages:

[0098] First, assemble the lower support structure 800, the middle support structure, and the upper support structure on the ground, and then install them in sequence by hoisting. This method is convenient, greatly reduces the number of operation steps, and improves work efficiency.

[0099] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0100] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method of cantilevered cap construction, characterized by, The application relates to a construction system for a cantilever cap beam, which comprises: a support rod for penetrating through a pier; a lower support structure comprising two upper chords and two lower chords, which are arranged horizontally and parallel to each other, and two lower chords are arranged below two upper chords respectively; two lower chords are supported by the two ends of the support rod penetrating through the pier, and the lower chords support the upper chords; a middle support structure comprising a plurality of Bailey frames, which are arranged horizontally and parallel to each other and are connected to each other; the middle support structure is in a rectangular shape, and the middle support structure is sleeved on the pier and supported on the lower support structure; an upper support structure in a rectangular shape, which is sleeved on the pier and supported on the middle support structure; the interior of the pier is hollow, a through hole is arranged on the pier for the support rod to penetrate through, a circular truncated cone nut is arranged in the interior of the pier corresponding to the through hole, the circular truncated cone nut is communicated with the corresponding through hole, and a steel pipe is further connected to the side of each circular truncated cone nut away from the corresponding inner wall of the pier, the steel pipe is communicated with the corresponding through hole, and when the support rod penetrates through the through hole, the support rod also penetrates through the circular truncated cone nut and the steel pipe; a cantilever cap beam construction method, which comprises the following steps: establishing a support structure: penetrating a plurality of through holes on the pier, and penetrating the support rod in the through holes; the step before penetrating the support rod in the through hole further comprises the following steps: using an electric drill to open the through hole on the pier, manually entering the interior of the pier, and installing the circular truncated cone nut in the interior of the pier, which is communicated with the corresponding through hole; manually inserting the steel pipe on the circular truncated cone nut; establishing a lower support structure: welding the upper chords, the lower chords and the connecting rods on the ground to form a structure; establishing a middle support structure: splicing a plurality of Bailey pieces on the ground to form a Bailey frame, and splicing a plurality of Bailey frames to form a rectangular structure; establishing an upper support structure: splicing a plurality of scaffolds on the ground to form a rectangular structure; installing the lower support structure: lifting the lower support structure to move above the pier, and lowering the lower support structure so that the lower support structure is sleeved on the pier and supported by the ends of the support rod; installing the middle support structure: lifting the middle support structure to move above the pier, and lowering the middle support structure so that the middle support structure is sleeved on the pier and placed above the lower support structure; installing the upper support structure: lifting the upper support structure to move above the pier, and lowering the upper support structure so that the upper support structure is sleeved on the pier and placed above the middle support structure.

2. The cantilever cap beam construction method according to claim 1, wherein The support rod has at least two, and the two support rods are parallel and located at the same height.

3. The cantilever cap beam construction method according to claim 2, wherein The end of the support rod penetrating through the pier is provided with a support piece, the support piece comprises a pressing plate and a support plate, the support plate is arranged horizontally above the corresponding support rod, and the pressing plate is fixed below the support plate; the pressing plate is provided with a gap slot for placing the support rod.

4. The cantilever cap beam construction method according to claim 3, wherein The upper support structure comprises a plurality of scaffolds and a plurality of railings, the plurality of scaffolds are connected to form a rectangular platform, and the plurality of railings are arranged along the edges of the platform to form an enclosure.

5. The cantilever cap beam construction method according to claim 4, wherein The lower support structure further comprises a plurality of connecting rods, the connecting rods are arranged between the upper chords and the lower chords, and two ends of the connecting rods are connected to the upper chords and the lower chords respectively.

6. The cantilever cap beam construction method according to claim 5, wherein In the step of placing the support rods in the through holes in the establishing of the support structure, the step further comprises: placing the support rods on the support plates, placing the support rods in the accommodation grooves, and placing the support plates above the support rods.

7. The cantilever cap beam construction method according to claim 6, wherein In the step of lowering the lower support structure in the installing of the lower support structure, the step further comprises: placing the lower surfaces of the lower chords on the upper surfaces of the corresponding support plates.

8. The cantilever cap beam construction method according to claim 6, wherein In the step of placing the support rods in the accommodation grooves in the establishing of the support structure, the step further comprises: tightening the locking nuts on the ends of the support rods, and pressing the corresponding pressing plates against the bridge piers.

9. The cantilever cap beam construction method according to claim 6, wherein In the step of installing the upper support structure, the step further comprises: welding the railings on the edges of the upper surfaces of the platforms.

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