Device for temporary prestress tensioning of segmental beam and construction method

Abstract

The invention relates to a device for temporary prestress tensioning of segmental beams and a construction method, and relates to the technical field of auxiliary tools for bridge construction, the device comprises a hoisting mechanism, the hoisting mechanism comprises two segmental beam lifting appliances arranged at intervals in the assembling direction of the segmental beams, and the segmental beam lifting appliances are in one-to-one correspondence with the segmental beams and are used for connecting the segmental beams; the anchoring mechanism is arranged on the segmental beam lifting appliance, an inserting assembly is arranged on the anchoring mechanism, and the inserting assembly is used for being inserted into the segmental beam with the matched notch; and the tensioning mechanism is connected with the corresponding anchoring mechanisms on the two segmental beams so as to provide temporary prestress. Due to the fact that the anchoring mechanism is directly connected with the segmental beam lifting appliance, only the segmental beam needs to be provided with the matched notch to be connected with the inserting assembly, other construction holes in the segmental beam are universal lifting holes in the lifting process, arrangement of embedded parts is reduced, materials needed for blocking the holes are reduced, and the problems that in the prior art, a lot of materials need to be consumed for blocking the holes, and the construction cost is reduced are solved. The installation is troublesome, and the construction efficiency is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary tooling for bridge construction, and in particular to a device and a construction method for temporary prestressing of segmental beams. Background Art

[0002] The segmental prefabrication and assembly method is a bridge construction technology that mainly prefabricates and assembles segments in the longitudinal direction. It divides the bridge into several segments in the longitudinal direction. After prefabrication in the factory, the segments are transported to the bridge site for assembly, and prestress is applied to make it an integral bridge structure. According to the different assembly methods between bridge segments in the segmental bridge assembly method, the segmental prefabrication bridge assembly method can be divided into three assembly methods: dry joint, wet joint and adhesive joint. When constructing prestressed concrete beams using the adhesive-bonded segmental prefabrication and assembly method, epoxy resin splicing glue is used instead of concrete connection for joint treatment. At the same time, temporary prestress needs to be loaded before the epoxy resin splicing glue is cured. When removing the temporary prestress, it should be ensured that no tensile stress appears in the joints during the entire construction stage.

[0003] In the prior art, there is a temporary prestressing device for prefabricated segmental beams with patent number CN108677729A, which includes adjacent prefabricated segments, and a temporary tensioning pedestal is provided on the prefabricated segments. The temporary tensioning pedestal includes an anchor plate for temporary prestressing to pass through, and the temporary prestressing is anchored to the anchor plate through a nut. A rib plate is provided on the back of the anchor plate, and a bottom plate is provided at the lower end of the anchor plate and the rib plate. In the present invention, the temporary tensioning pedestal can be dismantled and reused, which reduces the amount of materials and the weight of the segment. In the present invention, the sleeve is embedded in the prefabricated segment of the concrete beam, and there is no need to open a hole in the template, which ensures the integrity of the template and reduces the types of templates. The number of sleeves in the present invention is small, and the sleeve bolt hole is easy to seal, which reduces the risk of water seepage on the bridge deck during operation. The positioning steel plate of the present invention is buried in the concrete, and the surface of the structure is leveled with a rubber plate, so there is no need to set a leveling steel plate, which is convenient for laying the bridge deck waterproof layer.

[0004] However, the temporary prestressing device used for the segmental prefabricated assembled beam needs to be embedded in the prefabricated segment of the concrete beam, which consumes a lot of materials to seal the holes, is difficult to install, and reduces the construction efficiency. Summary of the invention

[0005] The present application provides a device and a construction method for temporary prestressing of segmental beams, which can solve the problem in the prior art that the temporary prestressing device for segmental prefabricated assembled beams needs to be embedded in the prefabricated segments of concrete beams, which requires a lot of materials to seal holes, is difficult to install, and reduces construction efficiency.

[0006] In a first aspect, an embodiment of the present application provides a device for temporary prestressing of a segmental beam, comprising:

[0007] The lifting mechanism comprises two segment beam lifting devices spaced apart along the segment beam assembly direction, the segment beam lifting devices corresponding to the segment beams one by one and used for connecting the segment beams;

[0008] An anchoring mechanism, which is arranged on the segment beam hanger, and a plug-in assembly is provided on the anchoring mechanism, and the plug-in assembly is used to be plugged into the segment beam with a matching notch;

[0009] The tensioning mechanism is connected with the corresponding anchoring mechanisms on the two segment beams to provide temporary prestressing force.

[0010] In one embodiment, the anchoring mechanism includes two anchoring seats arranged at intervals along the length direction of the segmental beam hanger, and the tensioning mechanism includes two groups of tensioning units arranged corresponding to the anchoring seats. The plug-in assembly is provided on the lower side of the anchoring seat, and the tensioning unit is arranged along the assembly direction of the segmental beam and is connected to the anchoring seat located on the same side of the segmental beam hanger.

[0011] In one embodiment, the tensioning unit comprises:

[0012] Prestressed steel bars pass through two anchorage seats located on the same side of the segment beam hanger and are connected to the inner one of the two adjacent anchorage seats;

[0013] The driving unit is arranged on the prestressed steel bar and located outside another anchor seat, and is used for providing temporary prestressing force.

[0014] In one embodiment, the tensioning unit also includes another prestressed steel bar, and the two prestressed steel bars are arranged at intervals along the length direction of the segmental beam hanger. Both pass through two anchor seats located on the same side of the segmental beam hanger, and are connected to the inner one of the two adjacent anchor seats. The prestressed steel bar is detachably connected to the driving unit.

[0015] In one embodiment, a connection structure is provided on the prestressed steel bar, and the connection structure is provided at both ends of an inner anchor seat of two adjacent anchor seats, and the connection structure is provided at one end of the other anchor seat away from the driving unit.

[0016] In one embodiment, the plug-in assembly includes three shear cones spaced apart along the length direction of the segmental beam hanger, the shear cones are plugged into the matching grooves prefabricated on the segmental beam, and the two prestressed steel bars respectively pass through the two middle intervals of the three shear cones.

[0017] In a second aspect, the present application also provides a construction method for temporary prestressing of segmental beams, which is implemented using the above-mentioned device for temporary prestressing of segmental beams, and includes the following steps:

[0018] Connect the segment beam hanger to the segment beam, and connect the plug-in assembly to the segment beam with the matching notch;

[0019] Use the segmental beam hoist to hoist the segmental beam to the designed position, then hoist the next segmental beam and glue it together;

[0020] The tensioning mechanism is connected with the corresponding anchoring mechanisms on the two segment beams for tensioning.

[0021] In one embodiment, the method of connecting the segmental beam hanger and the segmental beam and connecting the plug-in assembly to the segmental beam with the mating notch opened comprises:

[0022] Connect the segmental beam hanger and the segmental beam through an anchoring hanger;

[0023] Adjust the length of the anchor hanger extending out of the segment beam hanger so that the plug-in assembly extends into the matching slot.

[0024] In one embodiment, the tensioning mechanism is connected to the corresponding anchoring mechanisms on the two segment beams to perform tensioning, including:

[0025] The prestressed steel bars are passed through the anchor seats on both sides respectively, and the connection structures are respectively arranged at the two ends of an inner anchor seat of two adjacent anchor seats and at one end of the other anchor seat close to the adjacent anchor seat;

[0026] The driving unit is arranged outside another anchoring seat, and the connection structure of the anchoring seat close to one end of the adjacent anchoring seat is loosened;

[0027] Start the drive unit to perform tensioning.

[0028] In one embodiment, after the tensioning mechanism is connected to the corresponding anchoring mechanisms on the two segment beams and tensioning is performed, the matching grooves are repaired by concrete and mortar.

[0029] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0030] When using the device for temporary prestressing of segmental beams, two segmental beam hangers arranged at intervals along the segmental beam assembly direction are matched with the segmental beams one by one, the anchoring mechanism is set on the segmental beam hanger, the segmental beam hanger is connected to the segmental beam, and the plug-in assembly is connected to the segmental beam with the matching notch opened, the segmental beam is hoisted to the designed position by the segmental beam hanger, and then the next segmental beam is hoisted and glued, and the tensioning mechanism is connected to the corresponding anchoring mechanisms on the two segmental beams to provide temporary prestressing. Since the anchoring mechanism is directly connected to the segmental beam hanger, only matching notches need to be opened on the segmental beam to connect with the plug-in assembly, and the remaining construction holes on the segmental beam are common hoisting holes during the hoisting process, which reduces the setting of embedded parts and the materials required for plugging holes, and solves the problem that the temporary prestressing device for segmental prefabricated assembly beams in the prior art needs to be embedded in the prefabricated segment of the concrete beam, which requires a lot of materials to plug holes, and there are installation troubles and reduced construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 The diagram is a top view of the structure of an embodiment of a device for temporary prestressing of segmental beams according to the present invention.

[0033] Figure 2 The present invention is a schematic side structural view of an embodiment of a device for temporary prestressing of segmental beams according to the present invention.

[0034] Figure 3 It is a front view structural schematic diagram of an embodiment of a device for temporary prestressing of segmental beams according to the present invention.

[0035] Figure 4 The figure is a schematic diagram of the top view of the structure of a segmental beam hanger in an embodiment of a device for temporary prestressing of a segmental beam of the present invention.

[0036] Figure 5 The figure is a side structural schematic diagram of a segmental beam hanger in an embodiment of a device for temporary prestressing of segmental beams of the present invention.

[0037] Figure 6 The schematic diagram of the top view of the structure of a segmental beam in an embodiment of a device for temporary prestressing of a segmental beam of the present invention.

[0038] Figure 7The figure is a schematic diagram of the side structure of a segmental beam in an embodiment of a device for temporary prestressing of a segmental beam according to the present invention.

[0039] Figure 8 It is a schematic structural diagram of the matching notches of segment beams in an embodiment of a device for temporary prestressing of segment beams of the present invention.

[0040] Fig. 9 The present invention is a schematic structural diagram of a segment beam hoisting hole in an embodiment of a device for temporary prestressing of a segment beam.

[0041] In the figure: 1. segmental beam hanger; 11. anchoring hanger; 12. hanging hanger; 2. segmental beam; 21. matching notch; 22. lifting hole; 3. anchoring mechanism; 31. plug-in assembly; 311. shear cone; 32. anchor seat; 4. tensioning mechanism; 41. prestressed steel bar; 411. connection structure; 412. connector; 42. drive unit. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The embodiments of the present application provide a device and a construction method for temporary prestressing of segmental beams, which can solve the problem in the prior art that the temporary prestressing device for segmental prefabricated assembled beams needs to be embedded in the prefabricated segments of concrete beams, which requires a lot of materials to seal the holes, causes installation difficulties, and reduces construction efficiency.

[0044] like Figure 1-Figure 9 As shown, on the one hand, the present application provides a device for temporary prestressing of segment beams, which includes:

[0045] The lifting mechanism comprises two segment beam lifting devices 1 arranged at intervals along the assembling direction of the segment beam 2, the segment beam lifting devices 1 correspond to the segment beam 2 one by one, and are used to connect the segment beam 2;

[0046] An anchor mechanism 3, which is arranged on the segment beam hanger 1, and a plug-in assembly 31 is provided on the anchor mechanism 3, and the plug-in assembly 31 is used to be plugged into the segment beam 2 with the matching slot 21;

[0047] The tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segment beams 2 to provide temporary prestressing force.

[0048] When using the device for temporary prestressing of segmental beams, two segmental beam hangers 1 spaced apart along the assembling direction of the segmental beams 2 are matched one to one with the segmental beams 2, the anchoring mechanism 3 is arranged on the segmental beam hangers 1, the segmental beam hangers 1 and the segmental beams 2 are connected, and the plug-in assembly 31 is connected to the segmental beam 2 with the mating groove 21 opened, the segmental beam 2 is hoisted to the designed position by the segmental beam hanger 1, and then the next segmental beam 2 is hoisted and glued, and the tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segmental beams 2 to provide temporary prestress. Since the anchoring mechanism 3 is directly connected to the segmental beam hanger 1, it is only necessary to open a matching slot 21 on the segmental beam 2 to connect it to the plug-in assembly 31, and the remaining construction holes on the segmental beam 2 are common lifting holes 22 during the lifting process, which reduces the setting of embedded parts and the materials required for blocking the holes. This solves the problem in the prior art that the temporary prestressed device used for segmental prefabricated assembled beams needs to be embedded in the prefabricated segment of the concrete beam, which requires a lot of materials to block the holes, causes installation troubles, and reduces construction efficiency.

[0049] In this example, the segment beam hanger 1 is connected to the bridge erecting machine via a suspension rod 12 .

[0050] like Figure 1 , Figure 2 and Figure 3 As shown, in some optional embodiments, the anchoring mechanism 3 includes two anchoring seats 32 spaced apart along the length direction of the segmental beam hanger 1, the tensioning mechanism 4 includes two groups of tensioning units arranged corresponding to the anchoring seats 32, a plug-in assembly 31 is provided on the lower side of the anchoring seat 32, the tensioning unit is arranged along the assembly direction of the segmental beam 2, and is connected to the anchoring seat 32 located on the same side of the segmental beam hanger 1.

[0051] In this embodiment, the anchoring mechanism 3 includes two anchoring seats 32 spaced apart along the length direction of the segmental beam hanger 1, and the tensioning mechanism 4 includes two groups of tensioning units arranged corresponding to the anchoring seats 32. A plug-in assembly 31 is provided on the lower side of the anchoring seat 32. The tensioning unit is arranged along the assembly direction of the segmental beam 2 and connects the two anchoring seats 32 located on the same side of the segmental beam hanger 1. The force stability of the segmental beam 2 connected with the two anchoring seats 32 is better, the structure is simple, and the safety is higher.

[0052] like Figure 1 and Figure 2 As shown, in some optional embodiments, the tensioning unit includes:

[0053] Prestressed steel bar 41, which passes through two anchor seats 32 located on the same side of the segment beam hanger 1, and is connected to the inner one of the two adjacent anchor seats 32;

[0054] The driving unit 42 is arranged on the prestressed steel bar 41 and located outside another anchor seat 32, and is used to provide temporary prestressing force.

[0055] In this embodiment, the structure of the tensioning unit is specifically described. The tensioning unit includes a prestressed steel bar 41 and a driving unit 42, wherein the prestressed steel bar 41 passes through two anchor seats 32 located on the same side of the segment beam hanger 1, and is connected to the inner one of the two adjacent anchor seats 32. The driving unit 42 is arranged on the prestressed steel bar 41 and is located on the outer side of the other anchor seat 32, and is used to provide temporary prestress. The structure is simple and easy to manufacture.

[0056] In this example, the driving unit 42 is a through-type jack. The prestressed steel bar 41 is formed by splicing a plurality of segments, and each segment is connected by a connector 412 .

[0057] like Figure 1 and Figure 2 As shown, in some optional embodiments, the tensioning unit also includes another prestressed steel bar 41. The two prestressed steel bars 41 are arranged at intervals along the length direction of the segmental beam hanger 1. They both pass through two anchor seats 32 located on the same side of the segmental beam hanger 1, and are connected to the inner one of the two adjacent anchor seats 32. The prestressed steel bar 41 is detachably connected to the driving unit 42.

[0058] In this embodiment, the tensioning unit also includes another prestressed steel bar 41. The two prestressed steel bars 41 are arranged at intervals along the length direction of the segmental beam hanger 1. They both pass through the two anchor seats 32 located on the same side of the segmental beam hanger 1, and are connected to the inner one of the two adjacent anchor seats 32. The prestressed steel bar 41 is detachably connected to the driving unit 42. After the tensioning of one of the prestressed steel bars 41 is completed, the driving unit 42 is removed and installed on the other prestressed steel bar 41 for tensioning. The stress condition of using two prestressed steel bars 41 is better.

[0059] like Figure 1 and Figure 2 As shown, in some optional embodiments, a connection structure 411 is provided on the prestressed steel bar 41, and connection structures 411 are provided at both ends of one of the two adjacent anchor seats 32 located on the inner side, and a connection structure 411 is provided at one end of the other anchor seat 32 away from the driving unit 42.

[0060] In this embodiment, a connecting structure 411 is provided on the prestressed steel bar 41, and connecting structures 411 are provided at both ends of one of the two adjacent anchor seats 32 located on the inner side, and a connecting structure 411 is provided at the end of the other anchor seat 32 away from the driving unit 42, which illustrates a specific connection method. It is convenient to loosen part of the connecting structure 411 for tensioning during the tensioning process, and the use effect is better.

[0061] In this example, a connection structure 411 is also provided on the side where the driving unit 42 is installed.

[0062] like Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, in some optional embodiments, the plug-in assembly 31 includes three shear cones 311 spaced apart along the length direction of the segmental beam hanger 1, the shear cones 311 are plugged into prefabricated matching grooves 21 on the segmental beam 2, and two prestressed steel bars 41 pass through two middle intervals of the three shear cones 311 respectively.

[0063] In this embodiment, the structure of the plug-in assembly 31 is specifically described. The plug-in assembly 31 includes three shear cones 311 spaced apart along the length direction of the segmental beam hanger 1. The shear cones 311 are plugged into the prefabricated matching grooves 21 on the segmental beam 2. Two prestressed steel bars 41 pass through two middle intervals of the three shear cones 311 respectively. The connection and force transmission effect between the plug-in assembly 31 and the segmental beam 2 is better, preventing the structure from being damaged during the force-bearing process.

[0064] like Figure 1-Figure 9 As shown, on the other hand, the present application also provides a construction method for temporary prestressing of segmental beams, which is implemented using the above-mentioned device for temporary prestressing of segmental beams, and includes the following steps:

[0065] Connect the segment beam hanger 1 and the segment beam 2, and connect the plug-in assembly 31 to the segment beam 2 with the matching notch 21;

[0066] The segment beam 2 is hoisted to the designed position by the segment beam hoist 1, and then the next segment beam 2 is hoisted and glued;

[0067] The tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segment beams 2 for tensioning.

[0068] When using the device for temporary prestressing of segmental beams, two segmental beam hangers 1 spaced apart along the assembling direction of the segmental beams 2 are matched one to one with the segmental beams 2, the anchoring mechanism 3 is arranged on the segmental beam hangers 1, the segmental beam hangers 1 and the segmental beams 2 are connected, and the plug-in assembly 31 is connected to the segmental beam 2 with the mating groove 21 opened, the segmental beam 2 is hoisted to the designed position by the segmental beam hanger 1, and then the next segmental beam 2 is hoisted and glued, and the tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segmental beams 2 to provide temporary prestress. Since the anchoring mechanism 3 is directly connected to the segmental beam hanger 1, it is only necessary to open a matching slot 21 on the segmental beam 2 to connect it to the plug-in assembly 31, and the remaining construction holes on the segmental beam 2 are common lifting holes 22 during the lifting process, which reduces the setting of embedded parts and the materials required for blocking the holes. This solves the problem in the prior art that the temporary prestressed device used for segmental prefabricated assembled beams needs to be embedded in the prefabricated segment of the concrete beam, which requires a lot of materials to block the holes, causes installation troubles, and reduces construction efficiency.

[0069] In some optional embodiments, the connecting segment beam hanger 1 and the segment beam 2, and connecting the plug assembly 31 to the segment beam 2 with the matching notch 21, include:

[0070] Connect the segment beam hanger 1 and the segment beam 2 via the anchoring hanger 11;

[0071] The length of the anchoring suspension rod 11 extending out of the segmental beam suspension device 1 is adjusted so that the plug-in assembly 31 extends into the matching slot 21 .

[0072] In this embodiment, in the process of connecting the segmental beam hanger 1 and the segmental beam 2 and connecting the plug-in assembly 31 to the segmental beam 2 with the mating slot 21 opened, the segmental beam hanger 1 and the segmental beam 2 are first connected through the anchoring hanger 11, and then the length of the anchoring hanger 11 extending out of the segmental beam hanger 1 is adjusted so that the plug-in assembly 31 extends into the mating slot 21, thereby simplifying the adjustment process.

[0073] In this example, the segment beam hanger 1 is connected to the segment beam 2 through the hanging hole 22 via the anchoring hanger 11 .

[0074] In some optional embodiments, the tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segment beams 2 to perform tensioning, including:

[0075] The prestressed steel bars 41 are passed through the anchor seats 32 on both sides respectively, and the connection structures 411 are respectively arranged at both ends of one of the two adjacent anchor seats 32 located on the inner side, and at one end of the other anchor seat 32 close to the adjacent anchor seat 32;

[0076] The driving unit 42 is arranged outside another anchoring seat 32, and the connecting structure 411 of the anchoring seat 32 close to one end of the adjacent anchoring seat 32 is loosened;

[0077] The driving unit 42 is started to perform tensioning.

[0078] In this embodiment, the tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segment beams 2. During the tensioning process, the prestressed steel bars 41 are first passed through the anchor seats 32 on both sides, and the connecting structures 411 are respectively arranged at the two ends of an inner anchor seat 32 of the two adjacent anchor seats 32, and at one end of the other anchor seat 32 close to the adjacent anchor seat 32, and then the driving unit 42 is arranged on the outer side of the other anchor seat 32, and the connecting structure 411 of the anchor seat 32 close to the adjacent anchor seat 32 is loosened, and finally the driving unit 42 is started for tensioning, which is easy to operate and the process is stable.

[0079] In this example, during the tensioning process, two prestressed steel bars 41 that are symmetrical along the length direction of the segment beam hanger 1 are tensioned simultaneously first, and then the remaining two prestressed steel bars 41 are tensioned synchronously.

[0080] In some optional embodiments, after the tensioning mechanism 4 is connected to the corresponding anchoring mechanisms 3 on the two segment beams 2 and tensioning is performed, the matching notches 21 are repaired by concrete and mortar.

[0081] In this embodiment, after the tensioning is completed, the matching notch 21 needs to be repaired with concrete and mortar to prevent the beam body from being affected.

[0082] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a 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 a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0083] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0084] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A device for temporary prestressing of segmental beams, characterized in that: include: A lifting mechanism, comprising two segment beam lifting devices (1) arranged at intervals along the segment beam (2) assembly direction, the segment beam lifting devices (1) corresponding to the segment beam (2) one by one, and used for connecting the segment beam (2); An anchoring mechanism (3) is arranged on the segment beam hanger (1), and a plug-in assembly (31) is provided on the anchoring mechanism (3), and the plug-in assembly (31) is used for plugging into the segment beam (2) with a matching notch (21); A tensioning mechanism (4) is connected to the corresponding anchoring mechanisms (3) on the two segment beams (2) to provide temporary prestressing force.

2. A device for temporary prestressing of segmental beams according to claim 1, characterized in that: The anchor mechanism (3) comprises two anchor seats (32) arranged at intervals along the length direction of the segment beam hanger (1); the tensioning mechanism (4) comprises two groups of tensioning units arranged corresponding to the anchor seats (32); the lower side of the anchor seat (32) is provided with the plug-in assembly (31); the tensioning unit is arranged along the assembly direction of the segment beam (2) and is connected to the anchor seat (32) located on the same side of the segment beam hanger (1).

3. A device for temporary prestressing of segmental beams according to claim 2, characterized in that: The tensioning unit comprises: A prestressed steel bar (41) passes through two anchoring seats (32) located on the same side of the segment beam hanger (1) and is connected to an inner one of the two adjacent anchoring seats (32); A driving unit (42) is arranged on the prestressed steel bar (41) and is located outside another anchor seat (32) for providing temporary prestressing force.

4. A device for temporary prestressing of segmental beams according to claim 3, characterized in that: The tensioning unit further comprises another prestressed steel bar (41), wherein the two prestressed steel bars (41) are arranged at intervals along the length direction of the segmental beam hanger (1), both pass through two anchor seats (32) located on the same side of the segmental beam hanger (1), and are connected to one of the two adjacent anchor seats (32) located on the inner side, and the prestressed steel bar (41) is detachably connected to the driving unit (42).

5. A device for temporary prestressing of segmental beams according to claim 4, characterized in that: The prestressed steel bar (41) is provided with a connection structure (411), and the connection structure (411) is provided at both ends of an inner anchor seat (32) of two adjacent anchor seats (32), and the connection structure (411) is provided at one end of the other anchor seat (32) away from the drive unit (42).

6. A device for temporary prestressing of segmental beams according to claim 4, characterized in that: The plug-in assembly (31) comprises three shear cones (311) arranged at intervals along the length direction of the segment beam hanger (1); the shear cones (311) are plugged into the matching grooves (21) prefabricated on the segment beam (2); and the two prestressed steel bars (41) respectively pass through two middle intervals of the three shear cones (311).

7. A construction method for temporary prestressing of segmental beams, characterized in that: The method is implemented by using a device for temporary prestressing of segment beams as claimed in any one of claims 1 to 6, comprising the following steps: Connecting the segment beam hanger (1) and the segment beam (2), and connecting the plug-in assembly (31) to the segment beam (2) with the matching notch (21); The segmental beam (2) is hoisted to the designed position by using the segmental beam hoist (1), and then the next segmental beam (2) is hoisted and glued together; The tensioning mechanism (4) is connected to the corresponding anchoring mechanisms (3) on the two segment beams (2) to perform tensioning.

8. A construction method for temporary prestressing of segmental beams according to claim 7, characterized in that: The connecting segment beam hanger (1) and the segment beam (2), and connecting the plug-in assembly (31) to the segment beam (2) with the matching notch (21) opened, comprises: Connecting the segment beam hanger (1) and the segment beam (2) via an anchoring hanger (11); The length of the anchoring suspension rod (11) extending out of the segment beam suspension device (1) is adjusted so that the plug-in assembly (31) extends into the matching notch (21).

9. A construction method for temporary prestressing of segmental beams according to claim 7, characterized in that: The tensioning mechanism (4) is connected to the corresponding anchoring mechanisms (3) on the two segment beams (2) to perform tensioning, comprising: The prestressed steel bars (41) are passed through the anchor seats (32) on both sides respectively, and the connection structures (411) are respectively arranged at both ends of an inner anchor seat (32) of two adjacent anchor seats (32) and at one end of the other anchor seat (32) close to the adjacent anchor seat (32); The driving unit (42) is arranged outside another anchoring seat (32), and the connection structure (411) of the anchoring seat (32) close to one end of the adjacent anchoring seat (32) is loosened; The driving unit (42) is started to perform tensioning.

10. A construction method for temporary prestressing of segmental beams according to claim 7, characterized in that: The tensioning mechanism (4) is connected to the corresponding anchoring mechanisms (3) on the two segment beams (2), and after tensioning, the matching notches (21) are repaired by concrete and mortar.

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