Steel bar modular prefabricated box girder and construction method

Abstract

The invention discloses a steel bar modular prefabricated box girder and a construction method. A steel bar framework is disassembled into a flange three-dimensional steel bar module, a top plate three-dimensional steel bar module, a web three-dimensional steel bar module and a bottom plate three-dimensional steel bar module; each reinforcing steel bar module forms a closed reinforcing steel bar cage structure matched with a flange, a top plate, a web plate and a bottom plate of the prefabricated box girder, a reinforcing steel bar framework with the large overall size is disassembled into the small reinforcing steel bar modules, construction and installation are convenient, each reinforcing steel bar module forms reinforcing steel bars in the corresponding area, hoisting and placing of the reinforcing steel bars and meshes one by one are not needed, and the construction cost is reduced. And meanwhile, the steel bar modules are connected through the local reinforcing steel bar modules, and the construction quality can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of railway engineering, and particularly relates to a modular precast box girder with steel bars. Background Art

[0002] As Figure 1 shown, the existing railway precast box girders are large in size and have a large number of steel bars, which are difficult to install. At present, the installation and tying of steel bars are mainly carried out manually by workers assisted by cranes, resulting in difficult control of the construction accuracy of precast box girders, large errors in the spacing of steel bars and the thickness of the protective layer, and also causing a series of problems such as high labor intensity, prominent safety hazards, and fluctuations in the construction quality of steel bars. In addition, harsh environments such as plateaus, severe cold, and high temperatures will exacerbate the construction difficulty, and the problems of low construction quality and efficiency of steel bars are more prominent.

[0003] Chinese Patent Application with Publication No. CN 119281987 A discloses a construction process for tying the steel bar skeleton of a precast box girder. In this process, the steel bar skeleton of the beam body is split into several steel bar meshes and steel strip meshes. Among them, the steel bar mesh is directly processed into the required shape, and then the steel bar mesh is directly placed in position on the tying formwork, and manual supplementary tying is carried out; for oversize meshes and special-shaped meshes, in the form of steel strip meshes, after the single-piece steel bars are processed and placed in position, the laying and tying of the full-length steel bars are completed through the steel strip mesh.

[0004] However, in the existing construction method of precast box girders, the steel bar skeleton of the precast box girder is divided into several steel bar meshes and steel strip meshes. After being processed separately, they are placed one by one for connection. The construction process is complex and the accuracy is low, making it difficult to maintain the construction quality of steel bars.

[0005] Therefore, how to effectively improve the construction quality of precast box girders and improve the construction efficiency has become an urgent problem to be solved in this field. Summary of the Invention

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a modular precast box girder with steel bars and a construction method with relatively high construction quality and efficiency.

[0007] To achieve the above object, the modular precast box girder with steel bars provided by the present invention includes a steel bar framework, which is composed of a flange three-dimensional steel bar module, a top plate three-dimensional steel bar module, a web three-dimensional steel bar module, a bottom plate three-dimensional steel bar module and a local strengthening steel bar module. The flange three-dimensional steel bar module, the top plate three-dimensional steel bar module, the web three-dimensional steel bar module and the bottom plate three-dimensional steel bar module are respectively configured to be adapted to the flange, the top plate, the web and the bottom plate of the precast box girder, and respectively form a closed steel bar cage structure. The local strengthening steel bar modules are respectively distributed at the intersections of the webs of the precast box girder with the flange, the top plate and the bottom plate to connect the flange three-dimensional steel bar module, the top plate three-dimensional steel bar module, the web three-dimensional steel bar module and the bottom plate three-dimensional steel bar module.

[0008] Further, the flange three-dimensional steel bar module includes a flange steel bar ring adapted to the flange of the precast box girder, width-adjusting steel bars distributed on the outer end surface of the flange steel bar ring, and flange longitudinal erection steel bars longitudinally and spacedly distributed in the flange steel bar ring.

[0009] Further, the top plate three-dimensional steel bar module includes a top plate steel bar ring adapted to the top plate of the precast box girder and top plate longitudinal erection steel bars longitudinally and spacedly distributed in the top plate steel bar ring.

[0010] Further, the web three-dimensional steel bar module includes a web steel bar ring adapted to the web of the precast box girder and web longitudinal erection steel bars longitudinally and spacedly distributed in the web steel bar ring.

[0011] Further, the bottom plate three-dimensional steel bars include a bottom plate steel bar ring adapted to the bottom plate of the precast box girder and bottom plate longitudinal erection steel bars longitudinally and spacedly distributed in the bottom plate steel bar ring.

[0012] Further, the flange steel bar ring, the top plate steel bar ring, the web steel bar ring and the bottom plate steel bar ring are respectively composed of a number of closed steel bars distributed along the inner sides of the flange, the top plate, the web and the bottom plate and arranged uniformly in the longitudinal direction.

[0013] Further, the local strengthening steel bar module includes a first strengthening steel bar mesh sheet, and the first strengthening steel bar mesh sheet includes first strengthening steel bars distributed at the intersection of the web of the precast box girder and the flange and first longitudinal strengthening erection steel bars longitudinally distributed on the first strengthening steel bars.

[0014] Further, the local strengthening steel bar module further includes a second strengthening steel bar mesh sheet, and the second strengthening steel bar mesh sheet includes second strengthening steel bars distributed at the intersection of the web of the precast box girder and the top plate and second longitudinal strengthening erection steel bars longitudinally distributed on the second strengthening steel bars.

[0015] Furthermore, the local reinforcement steel bar module further includes a third reinforcement steel bar mesh sheet, and the third reinforcement steel bar mesh sheet includes third reinforcement steel bars distributed at the intersection of the web and the bottom plate of the precast box girder and third longitudinal reinforcement erection steel bars longitudinally distributed on the third reinforcement steel bars.

[0016] In order to achieve the above object, the construction method of the steel bar modular precast box girder provided by the present invention is based on the steel bar modular precast box girder, and the construction method includes:

[0017] Install the three-dimensional steel bar module of the bottom plate,

[0018] Install the first reinforcement steel bar mesh sheet at the intersection of the web and the flange of the precast box girder,

[0019] Install the three-dimensional steel bar module of the web,

[0020] Install the second reinforcement steel bar mesh sheet at the intersection of the web and the top plate of the precast box girder, and synchronously install the third reinforcement steel bar mesh sheet at the intersection of the web and the bottom plate of the precast box girder,

[0021] Install the three-dimensional steel bar module of the flange,

[0022] Install the three-dimensional steel bar module of the top plate.

[0023] For the steel bar modular precast box girder and the construction method provided by the present invention, the steel bar skeleton is respectively disassembled into a three-dimensional steel bar module of the flange, a three-dimensional steel bar module of the top plate, a three-dimensional steel bar module of the web and a three-dimensional steel bar module of the bottom plate, and each steel bar module respectively forms a closed steel bar cage structure adapted to the flange, the top plate, the web and the bottom plate of the precast box girder. The relatively large-sized steel bar skeleton as a whole is disassembled into smaller steel bar modules, which is convenient for construction and installation. Moreover, each steel bar module respectively constitutes the steel bars in the corresponding area, and there is no need to hoist and place each steel bar and mesh sheet one by one, which can effectively improve the construction efficiency. At the same time, the steel bar modules are connected through the local reinforcement steel bar module, which can effectively improve the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] Figure 1 It is a schematic diagram of the steel bar distribution of the existing precast box girder;

[0026] Figure 2 It is a schematic diagram of the overall structure of the steel bar modular precast box girder provided by the present invention;

[0027] Figure 3 and Figure 4 It is a schematic diagram of the structure of the three-dimensional steel bar module of the flange in the present invention;

[0028] Figure 5It is a schematic diagram of the steel bar distribution in the flange area of the existing precast box girder;

[0029] Figure 6 and Figure 7 It is a schematic diagram of the structure of the three-dimensional steel bar module for the top plate in the present invention;

[0030] Figure 8 It is a schematic diagram of the steel bar distribution in the top plate area of the existing precast box girder;

[0031] Figure 9 and Figure 10 It is a schematic diagram of the structure of the three-dimensional steel bar module for the web in the present invention;

[0032] Figure 11 It is a schematic diagram of the steel bar distribution in the web area of the existing precast box girder;

[0033] Figure 12 and Figure 13 It is a schematic diagram of the structure of the three-dimensional steel bar module for the bottom plate in the present invention;

[0034] Figure 14 It is a schematic diagram of the steel bar distribution in the bottom plate area of the existing precast box girder;

[0035] Figure 15 and Figure 16 It is a schematic diagram of the structure of the local strengthening steel bar module in the present invention;

[0036] Figure 17 It is a schematic flow diagram of the construction method of the steel bar modular precast box girder provided by the present invention;

[0037] Figure 18 The steel bar distribution schematic diagram of the steel bar modular precast box girder in the present invention. Detailed implementation manners

[0038] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0039] Refer to Figure 2 , which shows an example of the steel bar modular precast box girder provided by the present invention.

[0040] As can be seen from the figure, the steel bar modular precast box girder of this example includes a steel bar skeleton, and the steel bar skeleton is composed of a flange three-dimensional steel bar module 1, a top plate three-dimensional steel bar module 2, a web three-dimensional steel bar module 3, a bottom plate three-dimensional steel bar module 4 and a local strengthening steel bar module 5.

[0041] The flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2, the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4 are respectively configured to be adapted to the flange 10, the top plate 20, the web 30 and the bottom plate 40 of the precast box girder, and respectively form a closed steel reinforcement cage structure, which is convenient for construction and installation, without the need for hoisting and placing each steel bar and mesh piece one by one, can effectively improve the construction efficiency. The local strengthening steel bar module 5 is respectively distributed at the intersections of the web 30 of the precast box girder with the flange 10, the top plate 20 and the bottom plate 30 to connect the flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2, the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4, and can effectively improve the construction quality.

[0042] Combined with Figure 3 and Figure 4 , among which, the flange three-dimensional steel bar module 1 is composed of a flange steel bar ring C1, a width adjustment steel bar C2 and a flange longitudinal erection steel bar C3. The flange steel bar ring C1, the flange steel bar ring C1, the width adjustment steel bar C2 and the flange longitudinal erection steel bar C3 cooperate to form a closed steel reinforcement cage structure adapted to the flange 10 of the precast box girder, so that when the flange three-dimensional steel bar module 1 is hoisted at the flange 10 of the precast box girder, the steel bar installation at the flange can be directly realized, forming the steel bars in the flange area and improving the construction efficiency.

[0043] Specifically, the flange steel bar ring C1 is composed of several closed steel bars distributed around the inner side of the flange 10 and arranged evenly along the longitudinal direction, so that the flange steel bar ring C1 can cover the flange 10.

[0044] Combined with Figure 5 , as an example, in the specific application process, the flange steel bar ring C1 can be formed by extending and fixing the first flange transverse steel bar N1 and the second flange transverse steel bar N2 distributed inside the flange 10 in the existing precast box girder.

[0045] Combined with Figure 3 , further, the inner end face of the flange steel bar ring C1 extends towards the top plate 20 and is staggered with the top plate three-dimensional steel bar module 2 distributed in the top plate 20, which is convenient for the subsequent connection between the flange three-dimensional steel bar module 1 and the top plate three-dimensional steel bar module 2 and ensures the construction quality.

[0046] Combined with Figure 3 and Figure 4 , correspondingly, the flange longitudinal erection steel bar C3 is longitudinally and spacedly distributed in the flange steel bar ring C1 to fix the flange steel bar ring C1. Specifically, the flange longitudinal erection steel bar C3 is built in the flange steel bar ring C1 and is evenly distributed around the inner circumferential surface of the flange steel bar ring C1 to fix the distribution structure of the flange steel bar ring C1, and cooperates with the flange steel bar ring C1 to form a steel reinforcement cage structure, which is convenient for the installation and placement of the flange three-dimensional steel bar module 1.

[0047] Further, the width-adjusting steel bars C2 are distributed on the outer end face of the flange steel bar ring C1. By adjusting the distribution spacing and connection length between the width-adjusting steel bars C2 and the flange steel bar ring C1, the length of the flange 10 can be adjusted to fit precast box girders of different structural dimensions.

[0048] The thus-formed flange three-dimensional steel bar module 1 can be directly hoisted and placed at the flange 10 of the precast box girder during construction to achieve the steel bar installation of the flange part, eliminating the need to hoist and tie steel bars one by one, which can effectively improve the construction efficiency.

[0049] Meanwhile, the flange three-dimensional steel bar module 1 has been precast before construction, and there is no need to consider the tying spacing of steel bars during construction, which can effectively improve the construction quality and precision.

[0050] Combined with Figure 6 and Figure 7 , further, the top plate three-dimensional steel bar module 2 is composed of a top plate steel bar ring C4 and top plate longitudinal erection steel bars C5. The top plate steel bar ring C4 and the top plate longitudinal erection steel bars C5 can cooperate to form a closed steel bar cage structure adapted to the top plate 20 of the precast box girder, so that when the top plate three-dimensional steel bar module 2 is hoisted at the top plate 20, the steel bar installation at the top plate can be directly achieved, forming the steel bars in the top plate area and improving the construction efficiency.

[0051] Specifically, the top plate steel bar ring C4 is composed of a number of closed steel bars distributed around the inner side of the top plate 20 and arranged uniformly along the longitudinal direction, so that the top plate steel bar ring C4 can cover the top plate 20.

[0052] Combined with Figure 8 , as an example, in the specific application process, the top plate steel bar ring C4 can be formed by intercepting, bending and fixing the first top plate transverse steel bars N3 and the second top plate transverse steel bars N4 distributed inside the top plate 20 in the existing precast box girder.

[0053] Combined with Figure 6 and Figure 7 , correspondingly, the top plate longitudinal erection steel bars C5 are longitudinally spaced and distributed in the top plate steel bar ring C4 to fix the top plate steel bar ring C4. Specifically, the top plate longitudinal erection steel bars C5 are built in the top plate steel bar ring C4 and are evenly spaced around the inner circumferential surface of the top plate steel bar ring C4 to fix the distribution structure of the top plate steel bar ring C4 and cooperate with the top plate steel bar ring C4 to form a steel bar cage structure, facilitating the installation and placement of the top plate three-dimensional steel bar module 2.

[0054] Further, the two ends of the top plate three-dimensional steel bar module 2 are staggered with the flange three-dimensional steel bar module 1 respectively to improve the connection strength between the top plate three-dimensional steel bar module 2 and the flange three-dimensional steel bar module 1 and ensure the construction quality.

[0055] The three-dimensional top plate steel bar module 2 thus formed can be directly hoisted and placed at the top plate 20 of the precast box girder during construction to achieve the steel bar installation of the top plate part, without hoisting and tying steel bars one by one, which can effectively improve the construction efficiency.

[0056] At the same time, the three-dimensional top plate steel bar module 2 has been precast before construction, and there is no need to consider the tying spacing of steel bars during construction, which can effectively improve the construction quality and accuracy.

[0057] Combined with Figure 9 and Figure 10 , correspondingly, the three-dimensional web steel bar module 3 is composed of a web steel bar ring C6 and web longitudinal erection steel bars C7. The web steel bar ring C6 and web longitudinal erection steel bars C7 can cooperate to form a closed steel bar cage structure adapted to the web 30 of the precast box girder, so that when the three-dimensional web steel bar module 3 is hoisted at the web 30, the steel bar installation at the web can be directly achieved, improving the construction efficiency.

[0058] Specifically, the web steel bar ring C6 is composed of several closed steel bars distributed around the inner side of the web 30 and arranged uniformly along the longitudinal direction, so that the web steel bar ring C6 can cover the web 30.

[0059] Combined with Figure 11 , as an example, in the specific application process, the web steel bar ring C6 can be formed by intercepting and fixing the web transverse steel bars N5 and bottom web transverse steel bars N6 distributed inside the web 30 and the bottom plate 40 in the existing precast box girder.

[0060] Combined with Figure 9 and Figure 10 , further, both ends of the web steel bar ring C6 extend towards the top plate 20 and the bottom plate 30 respectively, and are staggered with the three-dimensional top plate steel bar module 2 distributed in the top plate 20 and the three-dimensional bottom plate steel bar module 4 distributed in the bottom plate 30 respectively, which is convenient for the subsequent connection of the three-dimensional web steel bar module 3 with the three-dimensional top plate steel bar module 2 and the three-dimensional bottom plate steel bar module 4, ensuring the construction quality.

[0061] Matched with it, the web longitudinal erection steel bars C7 are distributed at intervals longitudinally in the web steel bar ring C6 to fix the web steel bar ring C6. Specifically, the web longitudinal erection steel bars C7 are built in the web steel bar ring C6 and are distributed evenly around the inner peripheral surface of the web steel bar ring C6 to fix the distribution structure of the web steel bar ring C6, and cooperate with the web steel bar ring C6 to form a steel bar cage structure, which is convenient for the installation and placement of the three-dimensional web steel bar module 3.

[0062] The three-dimensional web steel bar module 3 thus formed can be directly hoisted and placed at the web 30 of the precast box girder during construction to achieve the steel bar installation of the web part, without hoisting and tying steel bars one by one, which can effectively improve the construction efficiency.

[0063] Meanwhile, the three-dimensional web steel bar module 3 has been prefabricated before construction. During construction, there is no need to consider the binding spacing of steel bars, which can effectively improve the construction quality and precision.

[0064] Combined with Figure 12 and Figure 13 , further, the three-dimensional bottom plate steel bar module 4 is composed of a bottom plate steel bar ring C8 and a bottom plate longitudinal erection steel bar C9. The bottom plate steel bar ring C8 and the bottom plate longitudinal erection steel bar C9 can cooperate to form a closed steel bar cage structure adapted to the bottom plate 40 of the precast box girder. When the three-dimensional bottom plate steel bar module 4 is hoisted at the bottom plate 40, the steel bar installation at the bottom plate can be directly realized, improving the construction efficiency.

[0065] Specifically, the bottom plate steel bar ring C8 is composed of several closed steel bars distributed around the inner side of the bottom plate 40 and arranged uniformly along the longitudinal direction, so that the bottom plate steel bar ring C8 can cover the bottom plate 40.

[0066] Combined with Figure 14 , as an example, in the specific application process, the bottom plate steel bar ring C8 can be formed by intercepting and fixing the bottom web transverse steel bars N6 and the bottom plate transverse steel bars N7 distributed inside the web 30 and the bottom plate 40 in the existing precast box girder.

[0067] Combined with Figure 12 and Figure 13 , further, both ends of the bottom plate steel bar ring C8 extend towards the web 30 respectively and are staggered with the three-dimensional web steel bar module 3 distributed in the web 30, which is convenient for the subsequent connection between the three-dimensional bottom plate steel bar module 4 and the three-dimensional web steel bar module 3 and ensures the construction quality.

[0068] Matched with it, the bottom plate longitudinal erection steel bars C9 are distributed at intervals longitudinally in the bottom plate steel bar ring C8 to fix the bottom plate steel bar ring C8. Specifically, the bottom plate longitudinal erection steel bars C9 are built in the bottom plate steel bar ring C8 and are evenly distributed at intervals around the inner circumferential surface of the bottom plate steel bar ring C8 to fix the distribution structure of the bottom plate steel bar ring C8 and cooperate with the bottom plate steel bar ring C8 to form a steel bar cage structure, which is convenient for the installation and placement of the three-dimensional bottom plate steel bar module 4.

[0069] The three-dimensional bottom plate steel bar module 4 thus formed can be directly hoisted and placed at the bottom plate 40 of the precast box girder during construction to realize the steel bar installation of the bottom plate part. There is no need to hoist and bind steel bars one by one, which can effectively improve the construction efficiency.

[0070] Meanwhile, the three-dimensional bottom plate steel bar module 4 has been prefabricated before construction. During construction, there is no need to consider the binding spacing of steel bars, which can effectively improve the construction quality and precision.

[0071] In this way, the steel reinforcement cage of the precast box girder is disassembled into a flange three-dimensional steel reinforcement module 1, a top plate three-dimensional steel reinforcement module 2, a web three-dimensional steel reinforcement module 3, and a bottom plate three-dimensional steel reinforcement module 4 corresponding to the flange 10, the top plate 20, the web 30, and the bottom plate 40 respectively. Each steel reinforcement module forms a corresponding closed steel reinforcement cage structure and covers the corresponding area, so that when each steel reinforcement module is hoisted to the corresponding area, the steel reinforcement installation in this area can be directly completed without the need for hoisting, tying, and spacing control of each individual steel reinforcement, effectively improving the construction efficiency and construction quality.

[0072] At the same time, compared with the overall steel reinforcement cage of the precast box girder, each steel reinforcement module formed after disassembly has a smaller size, which is convenient for transportation and hoisting, thus reducing the labor intensity.

[0073] In order to connect the flange three-dimensional steel reinforcement module 1, the top plate three-dimensional steel reinforcement module 2, the web three-dimensional steel reinforcement module 3, and the bottom plate three-dimensional steel reinforcement module 4 to form a precast box girder with a stable structure, the steel reinforcement cage also includes a local strengthening steel reinforcement module 5.

[0074] Combined Figure 15 and Figure 16 , the local strengthening steel reinforcement module 5 is respectively distributed at the intersections of the web 30 with the flange 10, the top plate 20, and the bottom plate 30 of the precast box girder to respectively connect the flange three-dimensional steel reinforcement module 1, the top plate three-dimensional steel reinforcement module 2, the web three-dimensional steel reinforcement module 3, and the bottom plate three-dimensional steel reinforcement module 4, and strengthen the connection strength of each module, improving the construction quality.

[0075] Specifically, the local strengthening steel reinforcement module 5 includes a first strengthening steel reinforcement mesh sheet 51, and the first strengthening steel reinforcement mesh sheet 51 is composed of first strengthening steel bars C10 and first longitudinal strengthening erection steel bars C11.

[0076] Combined Figure 15 and Figure 16 , among them, the first strengthening steel bars C10 are distributed at the intersection of the web 30 and the flange 10 of the precast box girder, and both ends extend towards the web 30 and the flange 10 respectively and are arranged evenly along the longitudinal direction, so that the first strengthening steel bars C10 can be respectively staggered with the web three-dimensional steel reinforcement module 3 and the flange three-dimensional steel reinforcement module 1 to fixedly connect the web three-dimensional steel reinforcement module 3 and the flange three-dimensional steel reinforcement module 1, ensuring the construction quality.

[0077] Cooperating with it, the first longitudinal strengthening erection steel bars C11 are longitudinally distributed on the first strengthening steel bars C10. Preferably, two first longitudinal strengthening erection steel bars C11 are longitudinally arranged at intervals on the first strengthening steel bars C10 to fix the distribution structure of the first strengthening steel bars C10 and at the same time ensure the connection strength between the first strengthening steel bars C10 and the web three-dimensional steel reinforcement module 3 and the flange three-dimensional steel reinforcement module 1.

[0078] In this way, the first reinforcing steel mesh sheet 51 can stably connect the web three-dimensional steel bar module 3 and the flange three-dimensional steel bar module 1.

[0079] Furthermore, the local reinforcing steel bar module 5 further includes a second reinforcing steel mesh sheet 52, which is composed of second reinforcing steel bars C12 and second longitudinal reinforcing erection steel bars C13.

[0080] Combined Figure 15 and Figure 16 , wherein the second reinforcing steel bars C12 are distributed at the intersection of the web 30 and the top plate 20 of the precast box girder, and extend towards the web 30 and the top plate 20 at both ends respectively, and are uniformly arranged longitudinally, so that the second reinforcing steel bars C12 can be respectively staggered with the web three-dimensional steel bar module 3, the top plate three-dimensional steel bar module 2 and the flange three-dimensional steel bar module 1 to fixedly connect the web three-dimensional steel bar module 3, the top plate three-dimensional steel bar module 2 and the flange three-dimensional steel bar module 1 and ensure the construction quality.

[0081] Correspondingly, the second longitudinal reinforcing erection steel bars C13 are longitudinally distributed on the second reinforcing steel bars C12. Preferably, two second longitudinal reinforcing erection steel bars C13 are longitudinally arranged at intervals on the second reinforcing steel bars C12 to fix the distribution structure of the second reinforcing steel bars C12 and at the same time ensure the connection strength between the second reinforcing steel bars C12 and the web three-dimensional steel bar module 3, the top plate three-dimensional steel bar module 2 and the flange three-dimensional steel bar module 1.

[0082] In this way, the second reinforcing steel mesh sheet 52 can stably connect the web three-dimensional steel bar module 3, the top plate three-dimensional steel bar module 2 and the flange three-dimensional steel bar module 1.

[0083] Correspondingly, the local reinforcing steel bar module 5 further includes a third reinforcing steel mesh sheet 53, which is composed of third reinforcing steel bars C14 and third longitudinal reinforcing erection steel bars C15.

[0084] Combined Figure 15 and Figure 16 , wherein the third reinforcing steel bars C14 are distributed at the intersection of the web 30 and the bottom plate 40 of the precast box girder, and extend towards the web 30 and the bottom plate 40 at both ends respectively, and are uniformly arranged longitudinally, so that the third reinforcing steel bars C14 can be respectively staggered with the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4 to fixedly connect the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4 and ensure the construction quality.

[0085] Correspondingly, the third longitudinal stiffening erection bars C15 are longitudinally distributed on the third reinforcing bars C14. Preferably, two third longitudinal stiffening erection bars C15 are longitudinally arranged at intervals on the third reinforcing bars C14 to fix the distribution structure of the third reinforcing bars C14 and ensure the connection strength between the third reinforcing bars C14 and the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4.

[0086] In this way, the third reinforcing bar mesh 53 can stably connect the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4.

[0087] The locally reinforced steel bar module 5 thus formed is respectively distributed at the intersections of the web 30 and the flange 10, the top plate 20 and the bottom plate 40 of the precast box girder through the first reinforcing bar mesh 51, the second reinforcing bar mesh 52 and the third reinforcing bar mesh 53, and cooperates with each other to stably connect the flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2, the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4, so as to ensure the stable connection of each steel bar module to form a solid steel bar skeleton of the precast box girder.

[0088] Furthermore, since the longitudinal length of the whole beam steel bars of the precast box girder is relatively long, for the convenience of construction, preferably, the longitudinal lengths of the flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2, the web three-dimensional steel bar module 3, the bottom plate three-dimensional steel bar module 4 and the locally reinforced steel bar module 5 can be 4-8 m, so as to facilitate the transportation and hoisting of each steel bar module and connect them to form the steel bar skeleton of a section of the precast box girder. Through the installation of multiple section steel bar skeletons, the whole beam steel bars of the precast box girder can be cooperatively formed.

[0089] Thus, the precast box girder with steel bar modularization provided by the present invention is formed.

[0090] The present invention also provides a construction method for the precast box girder with steel bar modularization. Based on the precast box girder with steel bar modularization formed by the above scheme, combined with Figure 17 and Figure 18 , this construction method includes:

[0091] S1: Install the bottom plate three-dimensional steel bar module 4.

[0092] First, hoist the bottom plate three-dimensional steel bar module 4 to the designed position of the precast box girder and install it at the position corresponding to the bottom plate 40 in the precast box girder formwork, so that the bottom plate three-dimensional steel bar module 4 directly forms the steel bars in the bottom plate area without the need for piece-by-piece hoisting and tying of the steel bars.

[0093] S2: Install the first reinforcing bar mesh 51 at the intersection of the web 30 and the flange 10 of the precast box girder.

[0094] Lift the first reinforcing steel mesh sheet 51 to the designed position of the precast box girder and install it at the intersection of the corresponding web 30 and flange 10 in the precast box girder formwork, which is convenient for subsequent connection of the web three-dimensional steel bar module 3 and the flange three-dimensional steel bar module 1.

[0095] S3: Install the web three-dimensional steel bar module 3.

[0096] Lift the web three-dimensional steel bar module 3 to the designed position of the precast box girder and install it at the corresponding position of the web 30 in the precast box girder formwork, so that the web three-dimensional steel bar module 3 directly forms the steel bars in the web area, eliminating the need for individual lifting and tying of steel bars.

[0097] Meanwhile, the web three-dimensional steel bar module 3 and the first reinforcing steel mesh sheet 51 and the bottom plate three-dimensional steel bar module 4 are staggered to facilitate subsequent connection and ensure construction quality.

[0098] S4: Install the second reinforcing steel mesh sheet 52 at the intersection of the web 30 and the top plate 10 of the precast box girder, and synchronously install the third reinforcing steel mesh sheet 53 at the intersection of the web 30 and the bottom plate 40 of the precast box girder.

[0099] Lift the second reinforcing steel mesh sheet 52 to the designed position of the precast box girder and install it at the intersection of the corresponding web 30 and the top plate 10 in the precast box girder formwork, so that the second reinforcing steel mesh sheet 52 and the web three-dimensional steel bar module 3 are staggered, which can connect the web three-dimensional steel bar module 3 and is convenient for subsequent installation of connecting the web three-dimensional steel bar module 3, the flange three-dimensional steel bar module 1 and the top plate three-dimensional steel bar module 2.

[0100] Meanwhile, lift the third reinforcing steel mesh sheet 53 to the designed position of the precast box girder and install it at the intersection of the corresponding web 30 and the bottom plate 40 in the precast box girder formwork, so that the third reinforcing steel mesh sheet 53 and the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4 are staggered, which can stably connect the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module 4 and ensure construction quality.

[0101] S5: Install the flange three-dimensional steel bar module 1.

[0102] Lift the flange three-dimensional steel bar module 1 to the designed position of the precast box girder and install it at the corresponding position of the flange 10 in the precast box girder formwork, so that the flange three-dimensional steel bar module 1 directly forms the steel bars in the flange area, eliminating the need for individual lifting and tying of steel bars.

[0103] Meanwhile, the flange three-dimensional steel bar module 1 and the first reinforcing steel mesh sheet 51 and the web three-dimensional steel bar module 3 are staggered, so that the first reinforcing steel mesh sheet 51 firmly connects the flange three-dimensional steel bar module 1 and the web three-dimensional steel bar module 3.

[0104] Correspondingly, the flange three-dimensional steel bar module 1 is also staggered with the second reinforcing steel bar mesh sheet 52, so that the second reinforcing steel bar mesh sheet 52 stably connects the flange three-dimensional steel bar module 1 and the web three-dimensional steel bar module 3, and is convenient for subsequent connection of the top plate three-dimensional steel bar module 2.

[0105] S6: Install the top plate three-dimensional steel bar module 2.

[0106] Lift and install the top plate three-dimensional steel bar module 2 to the designed position of the precast box girder, and install it at the position corresponding to the top plate 20 in the precast box girder formwork, so that the top plate three-dimensional steel bar module 2 directly forms the steel bars in the top plate area, without the need for individual lifting and binding of the steel bars.

[0107] Meanwhile, the top plate three-dimensional steel bar module 2 is staggered with the flange three-dimensional steel bar module 1, the web three-dimensional steel bar module 3 and the second reinforcing steel bar mesh sheet 52 respectively, so that the second reinforcing steel bar mesh sheet 52 stably connects the flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2 and the web three-dimensional steel bar module 3, ensuring the construction quality.

[0108] Combine Figure 18 , thereby forming the steel bar framework of a segment of the precast box girder. Repeat S1 to S6 to form multiple segment steel bar frameworks, so that the multiple segment steel bar frameworks cooperate with each other to form the integral beam steel bars of the precast box girder.

[0109] The steel bar modular precast box girder and construction method provided by the present invention disassemble the steel bar framework of the precast box girder into the flange three-dimensional steel bar module 1, the top plate three-dimensional steel bar module 2, the web three-dimensional steel bar module 3 and the bottom plate three-dimensional steel bar module corresponding to the flange, the top plate, the web and the bottom plate, so as to reduce the size of each steel bar module, facilitate transportation and installation, and each steel bar module respectively forms the steel bars in the corresponding area, without the need for individual lifting and binding of the steel bars, ensuring the construction accuracy and improving the construction efficiency. Meanwhile, by connecting each steel bar module through the local strengthening steel bar module 5, the construction quality can be effectively improved.

[0110] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A modular precast box girder made of steel bars, including a steel bar skeleton, characterized in that, The steel reinforcement cage is composed of flange three-dimensional steel reinforcement modules, top plate three-dimensional steel reinforcement modules, web three-dimensional steel reinforcement modules, bottom plate three-dimensional steel reinforcement modules and local strengthening steel reinforcement modules. The flange three-dimensional steel reinforcement modules, top plate three-dimensional steel reinforcement modules, web three-dimensional steel reinforcement modules and bottom plate three-dimensional steel reinforcement modules are respectively configured to be adapted to the flange, top plate, web and bottom plate of the precast box girder, and respectively form closed steel reinforcement cage structures. The local strengthening steel reinforcement modules are respectively distributed at the intersections of the web of the precast box girder with the flange, top plate and bottom plate to connect the flange three-dimensional steel reinforcement modules, top plate three-dimensional steel reinforcement modules, web three-dimensional steel reinforcement modules and bottom plate three-dimensional steel reinforcement modules.

2. The modular precast box girder made of steel bars according to claim 1, wherein The flange three-dimensional steel reinforcement module includes a flange steel reinforcement ring adapted to the flange of the precast box girder, width adjustment steel reinforcements distributed on the outer end face of the flange steel reinforcement ring, and flange longitudinal erection steel reinforcements longitudinally and spacedly distributed in the flange steel reinforcement ring.

3. The modular precast box girder made of steel bars according to claim 2, characterized in that, The top plate three-dimensional steel reinforcement module includes a top plate steel reinforcement ring adapted to the top plate of the precast box girder and top plate longitudinal erection steel reinforcements longitudinally and spacedly distributed in the top plate steel reinforcement ring.

4. The modular precast box girder made of steel bars according to claim 3, characterized in that, The web three-dimensional steel reinforcement module includes a web steel reinforcement ring adapted to the web of the precast box girder and web longitudinal erection steel reinforcements longitudinally and spacedly distributed in the web steel reinforcement ring.

5. The modular precast box girder made of steel bars according to claim 4, characterized in that, The bottom plate three-dimensional steel reinforcement includes a bottom plate steel reinforcement ring adapted to the bottom plate of the precast box girder and bottom plate longitudinal erection steel reinforcements longitudinally and spacedly distributed in the bottom plate steel reinforcement ring.

6. The modular precast box girder made of steel bars according to claim 5, wherein, The flange steel reinforcement ring, top plate steel reinforcement ring, web steel reinforcement ring and bottom plate steel reinforcement ring are respectively composed of a number of closed steel reinforcements distributed along the inner sides of the flange, top plate, web and bottom plate and arranged uniformly in the longitudinal direction.

7. The modular precast box girder made of steel bars according to claim 1, characterized in that, The local strengthening steel reinforcement module includes a first strengthening steel reinforcement mesh. The first strengthening steel reinforcement mesh includes first strengthening steel reinforcements distributed at the intersection of the web of the precast box girder with the flange and first longitudinal strengthening erection steel reinforcements longitudinally distributed on the first strengthening steel reinforcements.

8. The modular precast box girder made of steel bars according to claim 7, characterized in that, The local strengthening steel reinforcement module further includes a second strengthening steel reinforcement mesh. The second strengthening steel reinforcement mesh includes second strengthening steel reinforcements distributed at the intersection of the web of the precast box girder with the top plate and second longitudinal strengthening erection steel reinforcements longitudinally distributed on the second strengthening steel reinforcements.

9. The modular precast box girder made of steel bars according to claim 8, characterized in that, The local strengthening steel reinforcement module further includes a third strengthening steel reinforcement mesh. The third strengthening steel reinforcement mesh includes third strengthening steel reinforcements distributed at the intersection of the web of the precast box girder with the bottom plate and third longitudinal strengthening erection steel reinforcements longitudinally distributed on the third strengthening steel reinforcements.

10. A construction method for a modular precast box girder made of steel bars, characterized in that, Based on the steel reinforcement modular precast box girder according to any one of claims 1 to 9, the construction method includes: Installing the bottom plate three-dimensional steel reinforcement module, Installing the first strengthening steel reinforcement mesh at the intersection of the web of the precast box girder with the flange, Installing the web three-dimensional steel reinforcement module, Installing the second strengthening steel reinforcement mesh at the intersection of the web of the precast box girder with the top plate, and synchronously installing the third strengthening steel reinforcement mesh at the intersection of the web of the precast box girder with the bottom plate, Installing the flange three-dimensional steel reinforcement module, Installing the top plate three-dimensional steel reinforcement module.

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