Cast-in-place box girder hoop bracket structure and construction method

Abstract

The invention provides a cast-in-place box girder hoop bracket structure and a construction method, and relates to the technical field of bridge engineering, the cast-in-place box girder hoop bracket structure comprises a first bracket structure, a second bracket structure and a bailey beam; the first bracket assembly is connected with the two first hoops, and the top of the first bracket assembly is connected with the bailey beam through a transverse distribution beam. The two first hoops are used for being connected with an external cylindrical pier in a hooping mode, and the two first hoops are distributed along the cylindrical pier in an up-down spaced mode. The second bracket structure comprises a second bracket assembly, a threaded rod and a fixing piece, the top of the second bracket assembly is connected with the bailey beam through a transverse distribution beam, and the second bracket assembly is connected with one end of the threaded rod through the fixing piece; the other end of the threaded rod is used for penetrating through the square pier and is fixedly connected with the square pier through a fixing piece. The technical problems that in the prior art, due to the fact that a large number of supporting materials are used for erecting a traditional support, the construction cost is increased, and construction is difficult in alpine canyons or river-crossing basins and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a cast-in-place box girder hoop bracket structure and a construction method. Background Art

[0002] With the continuous development of modern bridge construction technology, the construction technology of box girder casting has also made great progress. Among them, the bracket method is a relatively mature box girder casting construction method in box girder construction. It has the advantages of convenient construction, simple technology, wide applicability, and no need for prefabrication sites. It is not only a main method for urban bridge construction, but also the preferred method for box girder casting construction in mountainous areas.

[0003] The existing support methods mainly include the full-bridge support construction method; the full-bridge support is composed of steel pipes, portal frames and other components, and is designed and constructed according to specific factors such as load, support height and use area. It has good integrity and its integrated structure helps to improve the overall stability of the construction. It can effectively withstand large loads and ensure the safety of the bridge structure during construction. Due to its reasonable design, the full-bridge support does not require large lifting equipment during the construction and disassembly process, which simplifies the construction process, makes the construction more convenient, and improves the construction efficiency of the project.

[0004] However, for conditions with steep terrain, soft geology and navigation and traffic conditions, the construction of conventional support foundations for cast-in-place box girders is difficult and the unfavorable foundation needs to be treated. Whether it is replacement or other treatment methods, it will increase the construction cost a lot. In addition, in the case of high piers, disc-type steel pipe supports cannot be erected, and large steel pipe steel supports are used. The large steel pipe columns are erected high, and the support material investment is large, resulting in excessive high-altitude operations. Summary of the invention

[0005] The purpose of the present invention is to provide a cast-in-place box girder clamp bracket structure and construction method to alleviate the technical problems existing in the prior art, such as the use of more supporting materials for erecting traditional brackets, resulting in increased construction costs, and the difficulty of construction in high mountain canyons or across river basins.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a cast-in-place box girder hoop bracket structure, comprising a first bracket structure, a second bracket structure and a Bailey beam;

[0008] The first bracket structure comprises a first bracket assembly and two first hoops, the first bracket assembly is connected to the two first hoops respectively, and the top of the first bracket structure is connected to the corresponding Bailey beam through a transverse distribution beam;

[0009] The two first hoops are used to be tightly connected to the external cylindrical pier, and the two first hoops are spaced apart and distributed vertically along the extension direction of the cylindrical pier;

[0010] The second bracket structure comprises a second bracket assembly, a threaded rod and a fixing member, the top of the second bracket assembly is connected to the corresponding Bailey beam through a transverse distribution beam, and the second bracket assembly is connected to one end of the threaded rod through the fixing member;

[0011] The other end of the threaded rod is used to pass through the square pier and is fixedly connected to the square pier through the fixing piece.

[0012] Furthermore, the first bracket assembly includes a first crossbar, a first vertical bar, a first diagonal bar and a connecting piece, and one end of the first crossbar is connected to the first hoop located above;

[0013] One end of the first vertical rod is connected to the first horizontal rod, and the other end of the first vertical rod is connected to the connecting member;

[0014] One end of the first oblique rod is connected to an end of the first cross rod away from the first vertical rod, and the other end of the first oblique rod is connected to the connecting member;

[0015] The connecting piece is connected to the first hoop located below.

[0016] Furthermore, the first hoop includes two hoop bodies, and the ends of the two hoop bodies are provided with ear plates, and the two hoop bodies are connected by the ear plates to be tightly connected with the cylindrical pier.

[0017] Furthermore, the first bracket structure also includes a second hoop, which is used to be tightly connected to the cylindrical pier, and the second hoop supports the first hoop located below.

[0018] Further, the second bracket assembly includes a second crossbar, a second vertical bar and a third diagonal bar, and one end of the second crossbar is used to be connected to the square pier through the threaded rod;

[0019] One end of the second vertical rod is connected to the second horizontal rod, and the other end is used to be connected to the square pier through the threaded rod;

[0020] One end of the third diagonal rod is connected to one end of the second cross bar away from the second vertical rod, and the other end of the third diagonal rod is connected to the second vertical rod.

[0021] Furthermore, a plug-in block is provided at one end of the second vertical pole away from the second horizontal pole, and the second vertical pole is used to be connected to the slot of the square pier through the plug-in block.

[0022] In a second aspect, the present invention provides a construction method for a cast-in-place box girder hoop bracket structure, comprising:

[0023] Installing first hoops at intervals on the cylindrical pier and along the extension direction of the cylindrical pier, and installing a first bracket assembly between two of the first hoops;

[0024] A Bailey beam is erected between two adjacent cylindrical piers, and the Bailey beam is erected between the corresponding cylindrical pier and the strip foundation block located on the inner side of the abutment, and the Bailey beam is supported by the first bracket assembly;

[0025] Installing a second bracket structure on the square pier, erecting the Bailey beam between the square pier and the adjacent cylindrical pier, and supporting the Bailey beam through the second bracket structure;

[0026] A buckle bracket is installed on the top of the Bailey beam, and a template back rib is installed on the top of the buckle bracket;

[0027] Laying a formwork on the top support of the buckle bracket, tying steel bars, and pouring concrete to complete the cast-in-place construction;

[0028] After the concrete reaches a desired strength, the first bracket structure and the second bracket structure are removed.

[0029] Furthermore, first hoops are installed at intervals on the cylindrical pier and along the extension direction of the cylindrical pier, and a first bracket assembly is installed between two of the first hoops, including:

[0030] A second hoop is installed at the bottom of the first hoop located below, and the second hoop is fixed to the cylindrical pier.

[0031] Furthermore, a second bracket structure is installed on the square pier, the Bailey beam is erected between the square pier and the adjacent cylindrical pier, and the Bailey beam is supported by the second bracket structure, including:

[0032] Opening through holes in the horizontal direction on the square pier, and passing threaded rods through the corresponding through holes;

[0033] Pass one end of the threaded rod through the second bracket assembly and fix it through a fixing member;

[0034] The other end of the threaded rod is fixed to the square pier through the fixing piece after passing through the square pier.

[0035] Furthermore, a second bracket structure is installed on the square pier, the Bailey beam is erected between the square pier and the adjacent cylindrical pier, and the Bailey beam is supported by the second bracket structure, including:

[0036] A slot is provided on the square pier;

[0037] Insert the plug-in block at the bottom of the second bracket structure into the slot to position the second bracket structure relative to the square pier.

[0038] The present invention can achieve the following beneficial effects:

[0039] The present invention provides a cast-in-place box girder clamp bracket structure, comprising a first bracket structure, a second bracket structure and a Bailey beam; the first bracket structure comprises a first bracket assembly and two first clamps, the first bracket assembly is respectively connected to the two first clamps, and the top of the first bracket structure is connected to the corresponding Bailey beam through a transverse distribution beam; the two first clamps are used to be tightly connected to an external cylindrical pier, and the two first clamps are distributed at intervals up and down along the extension direction of the cylindrical pier; the second bracket structure comprises a second bracket assembly, a threaded rod and a fixing piece, the top of the second bracket assembly is connected to the corresponding Bailey beam through the transverse distribution beam, and the second bracket assembly is connected to one end of the threaded rod through the fixing piece; the other end of the threaded rod is used to pass through a square pier, and is fixedly connected to the square pier through the fixing piece.

[0040] In the present invention, not only can different pier forms such as cylindrical piers or square piers be handled, but also various complex terrain environments such as undulating canyons or wading rivers can be met. First, the terrain at the abutment is relatively gentle, and a foundation hardening method can be adopted, such as adding a strip foundation block to support the Bailey bracket. Then, in order to adapt to different pier shapes and steep terrains, a first clamp is selected to be arranged at intervals at the top position of the cylindrical pier, and a first bracket assembly is installed between the two first clamps, and the Bailey beam is supported by a transverse distribution beam at the top of the first bracket assembly. At this time, the Bailey beam is arranged between the two cylindrical piers and between the strip foundation block and the cylindrical pier; the square pier is different from the cylindrical pier in that a through hole is selected to be opened in the horizontal direction at its top position, and a threaded rod is inserted into the through hole, one end of the threaded rod is connected to the square pier through a fixing piece, and the other end is used to connect to the first bracket assembly through a fixing piece, and a Bailey beam is erected between the square pier and the adjacent cylindrical pier; and at the top of the Bailey beam, a buckle bracket and a template back rib are installed in sequence from bottom to top.

[0041] Compared with the prior art, the cast-in-place box girder clamp bracket structure provided by the present invention, by erecting a first bracket structure on a cylindrical pier and a second bracket structure on a square pier, can realize the use of the first bracket structure and the second bracket structure to support upper structures such as Bailey beams, thereby avoiding the construction inconvenience caused by the need to erect a full-height bracket from the bottom of the pier in canyons and rivers, and effectively saving construction costs.

[0042] In summary, the present invention at least alleviates the technical problems existing in the prior art, such as the increased construction cost caused by the large amount of supporting materials used in setting up traditional scaffolds, and the difficulty in construction in mountainous canyons or across river basins. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the overall structure of a cast-in-place box girder hoop bracket structure provided by an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the main structure of a first bracket portion of a cast-in-place box girder hoop bracket structure provided by an embodiment of the present invention;

[0046] Figure 3 A schematic top view of a first hoop portion structure of a cast-in-place box girder hoop bracket structure provided by an embodiment of the present invention;

[0047] Figure 4 A schematic top view of a second hoop portion structure of a cast-in-place box girder hoop bracket structure provided by an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the main structure of the second bracket part of the cast-in-place box girder hoop bracket structure provided by an embodiment of the present invention;

[0049] Figure 6 for Figure 1 A-section structure enlarged schematic diagram.

[0050] Icons: 1-first bracket structure; 11-first crossbar; 12-first vertical pole; 13-first diagonal pole; 14-connecting piece; 15-first clamp; 151-clamp body; 152-ear plate; 16-second clamp; 2-second bracket structure; 21-second crossbar; 22-second vertical pole; 221-plug-in block; 23-third diagonal pole; 24-threaded rod; 25-fixing piece; 3-cylindrical pier; 4-square pier; 5-strip foundation block; 6-Bailey beam; 7-disc bracket; 8-template back rib; 9-transverse distribution beam. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0055] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0056] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be 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.

[0057] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] Embodiment 1

[0059] This embodiment provides a cast-in-place box beam bracket structure, referring to Figure 1 and Figure 6The cast-in-place box girder clamp bracket structure includes a first bracket structure 1, a second bracket structure 2 and a Bailey beam 6; the first bracket structure 1 includes a first bracket assembly and two first clamps 15, the first bracket assembly is respectively connected to the two first clamps 15, and the top of the first bracket structure 1 is connected to the corresponding Bailey beam 6 through a transverse distribution beam 9; the two first clamps 15 are used to be tightly connected to the external cylindrical pier 3, and the two first clamps 15 are distributed at intervals up and down along the extension direction of the cylindrical pier 3; the second bracket structure 2 includes a second bracket assembly, a threaded rod 24 and a fixing piece 25, the top of the second bracket assembly is connected to the corresponding Bailey beam 6 through a transverse distribution beam 9, and the second bracket assembly is connected to one end of the threaded rod 24 through the fixing piece 25; the other end of the threaded rod 24 is used to pass through the square pier 4, and is fixedly connected to the square pier 4 through the fixing piece 25.

[0060] The embodiments of the present invention at least alleviate the technical problems existing in the prior art, such as the increased construction cost caused by the large amount of supporting materials used in setting up traditional brackets, and the difficulty of construction in mountainous canyons or across river basins.

[0061] In the embodiment of the present invention, not only can it cope with different pier forms such as cylindrical pier 3 or square pier 4, but it can also meet the needs of various complex terrain environments, such as undulating canyons or wading rivers. First, the terrain at the abutment is relatively gentle, and a foundation hardening method can be adopted, such as adding a strip foundation block 5 to support the Bailey bracket. Then, in order to adapt to different pier shapes and steep terrains, the first clamp 15 is selected to be arranged at intervals at the top of the cylindrical pier 3, and the first bracket assembly is installed between the two first clamps 15. The Bailey beam 6 is supported by the transverse distribution beam 9 at the top of the first bracket assembly. At this time, the Bailey beam 6 is arranged between the two cylindrical piers 3 and between the strip foundation block 5 and the cylindrical pier 3; the square pier 4 is different from the cylindrical pier 3 in that a through hole is selected to be opened in the horizontal direction at its top position, and a threaded rod 24 is inserted into the through hole. One end of the threaded rod 24 is connected to the square pier 4 through a fixing member 25, and the other end is used to connect to the first bracket assembly through the fixing member 25, and the Bailey beam 6 is set between the square pier 4 and the adjacent cylindrical pier 3; and the buckle bracket 7 and the template back rib are installed in sequence from bottom to top at the top of the Bailey beam 6.

[0062] It should be noted that the first bracket structure 1 and the second bracket structure 2 are both connected to the corresponding Bailey beams 6 via the transverse distribution beams 9, and the transverse distribution beams 9 are fixed to the Bailey beams 6 via U-bolts arranged at intervals.

[0063] Compared with the prior art, the cast-in-place box girder hoop bracket structure provided in the embodiment of the present invention, by erecting a first bracket structure 1 on the cylindrical pier 3 and a second bracket structure 2 on the square pier 4, can realize the use of the first bracket structure 1 and the second bracket structure 2 to support the upper structure such as the Bailey beam 6, thereby avoiding the construction inconvenience caused by the need to erect a full-height bracket from the bottom of the pier in canyons and rivers, and effectively saving construction costs.

[0064] In an optional implementation manner of this embodiment, refer to Figure 1 and Figure 2 The first bracket assembly includes a first cross bar 11, a first vertical bar 12, a first oblique bar 13 and a connecting piece 14. One end of the first cross bar 11 is connected to a first clamp 15 located above; one end of the first vertical bar 12 is connected to the first cross bar 11, and the other end of the first vertical bar 12 is connected to the connecting piece 14; one end of the first oblique bar 13 is connected to an end of the first cross bar 11 away from the first vertical bar 12, and the other end of the first oblique bar 13 is connected to the connecting piece 14; the connecting piece 14 is connected to the first clamp 15 located below.

[0065] Specifically: two first hoops 15 are fixed on the cylindrical pier 3, and then the first cross bar 11 is horizontally set and connected to the first hoop 15 located above, and the first hoop 15 located below is connected to the connecting piece 14; the top of the vertically set first upright 12 is connected to the first cross bar 11, and the bottom thereof is connected to the connecting piece 14; one end of the first diagonal bar 13 is connected to the end of the first cross bar 11 away from the first upright 12, and the other end of the first diagonal bar 13 is connected to the connecting piece 14, thereby forming a triangular frame support structure surrounded by the first cross bar 11, the first upright 12 and the first diagonal bar 13. It should be noted that the first cross bar 11, the first upright 12 and the first diagonal bar 13 are all made of I-beams, and the connecting piece 14 can be made of a combination of 20 mm thick steel plates welded together, and a rectangular socket is provided to facilitate the insertion of the first upright 12 and the first diagonal bar 13 and then fix them by pins.

[0066] Further, refer to Figure 3 The first clamp 15 includes two clamp bodies 151 , and the ends of the two clamp bodies 151 are provided with ear plates 152 , and the two clamp bodies 151 are connected by the ear plates 152 to be tightly connected with the cylindrical pier 3 .

[0067] Specifically: the first clamp 15 includes two interconnected clamp bodies 151, and the clamp body 151 is made of 20 mm thick steel plate strip, and the plate strip is provided with ribs in the circumferential and vertical directions; and the ear plate 152 is provided with a pin hole with a diameter of 80 mm, which is used to connect through a pin shaft and clamp on the cylindrical pier 3.

[0068] In an optional implementation manner of this embodiment, refer to Figure 4 The first bracket structure 1 also includes a second hoop 16, which is used to be tightly connected to the cylindrical pier 3, and the second hoop 16 supports the first hoop 15 located below.

[0069] Specifically: the second hoop 16 includes two second hoop monomers, and the ends of the two second hoop monomers are correspondingly connected to enclose a ring-shaped second hoop 16, and the second hoop 16 is fixedly connected to the cylindrical pier 3 and supported on the bottom of the first hoop 15 located below, so as to achieve enhanced support for the first hoop 15 located below.

[0070] In an optional implementation manner of this embodiment, refer to Figure 5 The second bracket assembly includes a second cross bar 21, a second vertical bar 22 and a third diagonal bar 23. One end of the second cross bar 21 is used to be connected to the square pier 4 through a threaded rod 24; one end of the second vertical bar 22 is connected to the second cross bar 21, and the other end is used to be connected to the square pier 4 through a threaded rod 24; one end of the third diagonal bar 23 is connected to one end of the second cross bar 21 away from the second vertical bar 22, and the other end is connected to the second vertical bar 22.

[0071] Specifically: a through hole is horizontally opened on the square pier 4, and a threaded rod 24 is provided in each through hole, and one end of some of the threaded rods 24 is fixedly connected to the square pier 4, and the other end is connected to one end of the horizontally arranged second cross bar 21; the top of the vertically arranged second upright rod 22 is connected to the second cross bar 21, and the other end is connected to the corresponding threaded rod 24; one end of the third oblique rod 23 is connected to one end of the second cross bar 21 away from the second upright rod 22, and the other end of the third oblique rod 23 is connected to the bottom end of the second upright rod 22.

[0072] Further, refer to Figure 5 An insert block 221 is provided at one end of the second vertical rod 22 away from the second cross rod 21 , and the second vertical rod 22 is used to be connected to the slot of the square pier 4 through the insert block 221 .

[0073] Specifically: a plug-in block 221 is provided at one end of the second vertical pole 22 away from the second cross bar 21, and the second vertical pole 22 is used to be connected to the slot of the square pier 4 through the plug-in block 221; preferably, the plug-in block 221 is a protruding end connected to the second vertical pole 22 and facing the square pier 4, so as to achieve a certain degree of support for the second bracket assembly by inserting the plug-in block 221 into the slot of the square pier 4.

[0074] It should be emphasized that in this embodiment, cylindrical piers 3 and / or square piers 4 can be selected for use according to the actual construction environment, and the number and arrangement order of the cylindrical piers 3 and square piers 4 can be selected according to actual usage requirements.

[0075] This embodiment provides a construction method of a cast-in-place box beam hoop bracket structure, comprising:

[0076] First hoops 15 are installed at intervals on the cylindrical pier 3 and along the extension direction of the cylindrical pier 3, and a first bracket assembly is installed between two first hoops 15;

[0077] A Bailey beam 6 is erected between two adjacent cylindrical piers 3, and a Bailey beam 6 is erected between a corresponding cylindrical pier 3 and a strip foundation block 5 located on the inner side of the abutment, and the Bailey beam 6 is supported by a first bracket assembly;

[0078] A second bracket structure 2 is installed on the square pier 4, a Bailey beam 6 is erected between the square pier 4 and the adjacent cylindrical pier 3, and the Bailey beam 6 is supported by the second bracket structure 2;

[0079] Install a buckle bracket 7 on the top of the Bailey beam 6, and install a template back rib 8 on the top of the buckle bracket 7;

[0080] Lay the formwork on the top support of the buckle bracket 7, tie the steel bars, and pour the concrete to complete the cast-in-place construction;

[0081] After the concrete reaches the required strength, the first bracket structure 1 and the second bracket structure 2 are removed.

[0082] Specifically: two first hoops 15 are provided at the top of the cylindrical pier 3, and the two first hoops 15 are spaced apart in the vertical direction, and the two first hoops 15 are used to connect with the first bracket assembly; similarly, a second bracket structure 2 is installed at the top of the square pier 4; and after each of the first bracket structure 1 and the second bracket structure 2 is installed, the Bailey beam 6 can be installed, and there are multiple Bailey beams 6, which are used to connect the strip foundation block 5 with the cylindrical pier 3, and connect the adjacent cylindrical piers 3 and square piers 4 in turn, and a buckle bracket 7 is installed on the top of the Bailey beam 6, and a template back rib 8 is installed on the top of the buckle bracket 7, and then the template is laid on the buckle bracket 7, and the steel bars are tied and concrete is poured to complete the cast-in-place construction; finally, after the concrete is dry and reaches the required strength, the first bracket structure 1 and the second bracket structure 2 can be removed.

[0083] It should be emphasized that the top of the buckle bracket 7 is provided with an adjustable top support and the bottom thereof is provided with an adjustable bottom support; the bottom support of the buckle bracket 7 is used to connect with the transverse distribution beam 9 on the Bailey beam 6, and the top support is connected with the template back rib 8. The transverse distribution beam 9 can be an I-beam.

[0084] Furthermore, first hoops 15 are installed at intervals on the cylindrical pier 3 and along the extension direction of the cylindrical pier 3, and a first bracket assembly is installed between two first hoops 15, including:

[0085] A second clamp 16 is installed at the bottom of the first clamp 15 located below, and the second clamp 16 is fixed to the cylindrical pier 3 .

[0086] Specifically: a second hoop 16 is arranged at the bottom of the first hoop 15 located below, and the second hoop 16 is also formed by connecting two semicircular rings and fastened to the cylindrical pier 3, that is, two groups of hoops are arranged at the bottom of the first bracket structure 1 to support the first bracket structure 1 and the Bailey beam 6, the buckle bracket 7 and the template back rib 8 thereon.

[0087] In an optional implementation of this embodiment, a second bracket structure 2 is installed on the square pier 4, the Bailey beam 6 is erected between the square pier 4 and the adjacent cylindrical pier 3, and the Bailey beam 6 is supported by the second bracket structure 2, including:

[0088] A through hole is opened in the horizontal direction on the square pier 4, and the threaded rod 24 is passed through the corresponding through hole;

[0089] Pass one end of the threaded rod 24 through the second bracket assembly and fix it through the fixing member 25;

[0090] The other end of the threaded rod 24 is fixed to the square pier 4 through a fixing piece 25 after passing through the square pier 4 .

[0091] Specifically: a plurality of through holes are opened in the horizontal direction at the top position of the square pier 4, and a threaded rod 24 is horizontally arranged in each through hole, and a fixing piece 25 is provided at one end of the threaded rod 24. The fixing piece 25 can preferably be a nut, and after the fixing piece 25 abuts against the square pier 4, one end of the threaded rod 24 is limited and fixed, and the other end is fixed by the fixing piece 25 after passing through the corresponding second bracket assembly.

[0092] In an optional implementation of this embodiment, a second bracket structure 2 is installed on the square pier 4, a Bailey beam 6 is set up between the square pier 4 and the adjacent cylindrical pier 3, and the Bailey beam 6 is supported by the second bracket structure 2, including:

[0093] A slot is provided on the square pier 4;

[0094] The plug-in block 221 at the bottom of the second bracket structure 2 is inserted into the slot to position the second bracket structure 2 relative to the square pier 4 .

[0095] Specifically, the plug-in block 221 at the bottom of the second bracket structure 2 is set as a rectangular parallelepiped structure. After being inserted into the slot of the square pier 4, the second bracket structure 2 is positioned relative to the square pier 4.

[0096] 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, and the same or similar parts between the various embodiments can be referenced to each other; the above embodiments in this specification 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 aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A cast-in-place box girder bracket structure, characterized in that: It comprises a first bracket structure (1), a second bracket structure (2) and a Bailey beam (6); The first bracket structure (1) comprises a first bracket assembly and two first hoops (15), the first bracket assembly is connected to the two first hoops (15) respectively, and the top of the first bracket structure (1) is connected to the corresponding Bailey beam (6) via a transverse distribution beam (9); The two first hoops (15) are used to be tightly connected to the external cylindrical pier (3), and the two first hoops (15) are spaced apart and distributed vertically along the extension direction of the cylindrical pier (3); The second bracket structure (2) comprises a second bracket assembly, a threaded rod (24) and a fixing member (25), the top of the second bracket assembly is connected to the corresponding Bailey beam (6) via a transverse distribution beam (9), and the second bracket assembly is connected to one end of the threaded rod (24) via the fixing member (25); The other end of the threaded rod (24) is used to pass through the square pier (4) and is fixedly connected to the square pier (4) through the fixing member (25).

2. The cast-in-place box girder hoop bracket structure according to claim 1 is characterized in that: The first bracket assembly comprises a first cross bar (11), a first vertical bar (12), a first diagonal bar (13) and a connecting piece (14); one end of the first cross bar (11) is connected to the first hoop (15) located above; One end of the first vertical rod (12) is connected to the first cross rod (11), and the other end of the first vertical rod (12) is connected to the connecting member (14); One end of the first oblique rod (13) is connected to an end of the first cross rod (11) away from the first vertical rod (12), and the other end of the first oblique rod (13) is connected to the connecting member (14); The connecting piece (14) is connected to the first clamp (15) located below.

3. The cast-in-place box girder hoop bracket structure according to claim 2 is characterized in that: The first clamp (15) comprises two clamp bodies (151), and the ends of the two clamp bodies (151) are each provided with an ear plate (152), and the two clamp bodies (151) are connected via the ear plate (152) so as to be tightly connected with the cylindrical pier (3).

4. The cast-in-place box girder hoop bracket structure according to claim 2 is characterized in that: The first bracket structure (1) further comprises a second hoop (16), wherein the second hoop (16) is used to be tightly connected to the cylindrical pier (3), and the second hoop (16) supports the first hoop (15) located below.

5. The cast-in-place box girder hoop bracket structure according to claim 1, characterized in that: The second bracket assembly comprises a second cross bar (21), a second vertical bar (22) and a third diagonal bar (23); one end of the second cross bar (21) is used to be connected to the square pier (4) through the threaded rod (24); One end of the second vertical rod (22) is connected to the second cross rod (21), and the other end is used to be connected to the square pier (4) through the threaded rod (24); One end of the third oblique rod (23) is connected to an end of the second cross rod (21) away from the second vertical rod (22), and the other end is connected to the second vertical rod (22).

6. The cast-in-place box girder hoop bracket structure according to claim 5, characterized in that: An insert block (221) is provided at one end of the second vertical rod (22) away from the second horizontal rod (21), and the second vertical rod (22) is used to be connected to the slot of the square pier (4) through the insert block (221).

7. A construction method for a cast-in-place box beam hoop bracket structure, characterized in that: include: First hoops (15) are installed at intervals on the cylindrical pier (3) and along the extension direction of the cylindrical pier (3), and a first bracket assembly is installed between two of the first hoops (15); A Bailey beam (6) is erected between two adjacent cylindrical piers (3), and the Bailey beam (6) is erected between the corresponding cylindrical pier (3) and a strip foundation block (5) located on the inner side of the abutment, and the Bailey beam (6) is supported by the first bracket assembly; A second bracket structure (2) is installed on the square pier (4), the Bailey beam (6) is erected between the square pier (4) and the adjacent cylindrical pier (3), and the Bailey beam (6) is supported by the second bracket structure (2); A buckle bracket (7) is installed on the top of the Bailey beam (6), and a template back rib (8) is installed on the top of the buckle bracket (7); Laying a formwork on the top support of the buckle bracket (7), tying steel bars, and pouring concrete to complete the cast-in-place construction; After the concrete reaches the required strength, the first bracket structure (1) and the second bracket structure (2) are removed.

8. The construction method of the cast-in-situ box beam hoop bracket structure according to claim 7 is characterized in that: First hoops (15) are installed at intervals on the cylindrical pier (3) and along the extension direction of the cylindrical pier (3), and a first bracket assembly is installed between two of the first hoops (15), comprising: A second clamp (16) is installed at the bottom of the first clamp (15) located below, and the second clamp (16) is fixed to the cylindrical pier (3).

9. The construction method of the cast-in-situ box beam hoop bracket structure according to claim 7, characterized in that: A second bracket structure (2) is installed on the square pier (4), the Bailey beam (6) is erected between the square pier (4) and the adjacent cylindrical pier (3), and the Bailey beam (6) is supported by the second bracket structure (2), comprising: Opening through holes in the horizontal direction on the square pier (4), and passing the threaded rods (24) through the corresponding through holes; Pass one end of the threaded rod (24) through the second bracket assembly and fix it through a fixing member (25); The other end of the threaded rod (24) is fixed to the square pier (4) through the fixing member (25) after passing through the square pier (4).

10. The construction method of the cast-in-situ box beam hoop bracket structure according to claim 7, characterized in that: A second bracket structure (2) is installed on the square pier (4), the Bailey beam (6) is erected between the square pier (4) and the adjacent cylindrical pier (3), and the Bailey beam (6) is supported by the second bracket structure (2), comprising: A slot is provided on the square pier (4); The plug-in block (221) at the bottom of the second bracket structure (2) is inserted into the slot to position the second bracket structure (2) relative to the square pier (4).

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