Prefabricated segmental beam high-precision rapid splicing end mold integrated assembly and splicing method

Abstract

The invention discloses a prefabricated segmental beam high-precision rapid splicing end mold integrated assembly and a splicing method, and belongs to the technical field of prefabricated segmental beam splicing, the prefabricated segmental beam high-precision rapid splicing end mold integrated assembly comprises a first splicing end mold integrated assembly plate and a second splicing end mold integrated assembly plate which are correspondingly arranged and are respectively poured on two prefabricated segmental beams; a plurality of male steel tooth keys and a plurality of female steel tooth keys; a plurality of male steel tooth keys are arranged on the first splicing end mold integrated assembly plate, and a plurality of female steel tooth keys are arranged on the second splicing end mold integrated assembly plate; during pouring manufacturing, pairwise matching and relative position matching of the male steel tooth key and the female steel tooth key are completed in advance; when two pre-spliced prefabricated segmental beams are spliced, the male steel tooth keys are matched with the corresponding female steel tooth keys. According to the invention, when the bearing capacity of the beam body is in a limit state and the splicing seam tension area is in a large-seam state, the whole body is not collapsed through shearing and meshing of a plurality of steel tooth keys in the splicing seam compression area; pairwise matching is performed in advance during manufacturing, and high-precision rapid splicing is realized during assembling.

Description

Technical Field

[0001] The present invention belongs to the technical field of prefabricated segmental beam splicing, and in particular relates to a high-precision rapid splicing end mold integrated component and a splicing method for prefabricated segmental beams. Background Art

[0002] The overall prefabricated components of the upper part of concrete bridges produced in the factory will face over-limit transportation problems such as excessive length and weight when transported to the construction site. It is often necessary to segment the prefabricated components and then splice and install them after transporting them to the construction site.

[0003] The splicing surfaces of prefabricated segmental beams generally adopt a tooth-key splicing method. The traditional manufacturing process uses a long-line segment matching method (the splicing surface of the cast segment is used as the end mold of the next segment). The work efficiency is low and cannot meet the needs of independent and mass production of industrial standard prefabricated components. Summary of the Invention

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] A high-precision, rapid-joining end formwork integrated assembly for prefabricated segmental beams, comprising:

[0006] A first splicing end form integrated component plate and a second splicing end form integrated component plate are provided correspondingly, wherein the first splicing end form integrated component plate and the second splicing end form integrated component plate are cast on two prefabricated segment beams respectively;

[0007] A plurality of male steel tooth keys and a plurality of female steel tooth keys, wherein the plurality of male steel tooth keys and the plurality of female steel tooth keys are arranged in a one-to-one correspondence; the plurality of male steel tooth keys are arranged on the first splicing end mold integrated component plate, and the plurality of female steel tooth keys are arranged on the second splicing end mold integrated component plate;

[0008] Among them, when the first splicing end mold integrated component plate and the second splicing end mold integrated component plate are cast and manufactured, the paired matching of the male steel tooth keys and the female steel tooth keys and the matching of the relative positions between multiple male steel tooth keys and multiple female steel tooth keys are completed in advance; when two pre-spliced prefabricated segment beams are spliced, the male steel tooth keys cooperate with the corresponding female steel tooth keys to achieve a 0.2 mm level docking accuracy of the two prefabricated segment beams.

[0009] Furthermore, the shapes of the first spliced end form integrated component plate and the second spliced end form integrated component plate are consistent with the cross-sectional shape of the beam joint of the prefabricated segmental beam, so as to serve as end formwork plates during the casting and production of the prefabricated segmental beam.

[0010] Furthermore, the male steel tooth key and the female steel tooth key are both arranged in the cross-section compression zone under the ultimate state of the bending bearing capacity of the prefabricated segment beam.

[0011] Furthermore, the male steel tooth key includes a male steel tooth key plate body, a raised portion arranged at one end of the male steel tooth key plate body, and a plurality of first anchoring steel bars arranged on the side of the male steel tooth key plate body away from the raised portion; the plurality of first anchoring steel bars are dispersedly arranged at an angle to the male steel tooth key plate body, wherein the male steel tooth key plate body and the plurality of first anchoring steel bars are cast in the prefabricated segment beam.

[0012] Furthermore, the female steel tooth key includes a female steel tooth key plate body, a recessed portion arranged at one end of the female steel tooth key plate body, and a plurality of second anchoring steel bars arranged on the side of the female steel tooth key plate body away from the recessed portion, and the plurality of second anchoring steel bars are dispersedly arranged at an angle to the female steel tooth key plate body; a thin steel plate is arranged on the outer side of the female steel tooth key plate body corresponding to the recessed portion, and the female steel tooth key plate body and the plurality of second anchoring steel bars are cast in the prefabricated segment beam; the recessed portion of the female steel tooth key is plugged into the raised portion of the male steel tooth key.

[0013] Furthermore, a plurality of distributed steel bars are connected to one side of the first spliced end form integrated component plate and the second spliced end form integrated component plate cast on the prefabricated segment beam.

[0014] A high-precision rapid splicing method for prefabricated segmental beams, using any of the above-mentioned methods for splicing prefabricated segmental beams with high-precision rapid splicing end mold integrated assemblies, the splicing method comprising the following steps:

[0015] S10, using the first spliced end form integrated component plate or the second spliced end form integrated component plate as an embedded part and end formwork of a prefabricated segmental beam, and casting a single spliced end form integrated component;

[0016] S20, using the cast integrated end mold assembly as a bottom mold, matching and installing a male steel tooth key or a female steel tooth key, and then casting another end mold integrated assembly to obtain a pair of matched end mold assemblies, wherein the ambient temperature during the molding of the two end mold assemblies is consistent, and the relative positions of the multiple male steel tooth keys and the multiple female steel tooth keys can be synchronously matched without being affected by external temperature changes;

[0017] S30, erecting formwork to cast the segmental beam with the end formwork splicing integrated assembly;

[0018] S40: Transport the segmental beams to the construction site and assemble them.

[0019] Beneficial effects:

[0020] 1. The present invention adopts male and female paired steel tooth keys for bite-joint connection, achieving a bite accuracy of 0.2mm. Among them, the main function of the steel tooth keys is to ensure that the beam body can still maintain its overall stability through the effective shear bite of the steel tooth keys in the compression zone of the joint section when the beam body reaches the ultimate bending bearing capacity limit state and the joint section has a large gap in the tension zone.

[0021] 2. The modularized spliced end formwork integrated component combines multiple steel tooth keys through UHPC casting, achieving a 0.2mm-level multi-steel tooth key component plate docking accuracy. The spliced end formwork integrated component plate is simple and efficient to manufacture and install, effectively resolving the matching contradiction between the millimeter-level docking accuracy requirements of multiple steel tooth keys and the millimeter-level manufacturing and docking accuracy of concrete precast beam sections.

[0022] 3. Through the modular production and splicing of the integrated end mold components, the standardized independent production and industrialized mass production of T-beam prefabricated segments are realized. Any independently produced prefabricated beam segments can be spliced quickly and accurately.

[0023] 4. The UHPC end formwork in the modular splicing end formwork integrated assembly plays a role in stress diffusion between the steel tooth key and the beam concrete, avoiding the problem of local cracking of the beam concrete caused by stress concentration in the area around the steel tooth key, and enhancing the local shear strength of the splicing joint.

[0024] 5. The modular splicing end formwork integrated assembly is installed on the splicing surface of the precast beam section to strengthen the local strength of the concrete in the compression zone and prevent the concrete in the compression zone of the splicing surface from collapsing prematurely.

[0025] 6. The modularized splicing end formwork integrated components are installed on the splicing surface of the prefabricated beam section, and the splicing surface is bonded with high-strength structural adhesive. For the prestressed tensioning in the construction phase and the tensile conditions of the splicing section that may occur in the use phase, since the splicing end formwork integrated component plate is connected to the beam end concrete with steel bars, it can effectively avoid the phenomenon of concrete cracking in the unreinforced area around the splicing glue that is prone to occur in traditional bonded joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a high-precision, rapid-joining end formwork integrated assembly for prefabricated segmental beams provided by the present invention;

[0027] Figure 2 It is a structural diagram of the male steel tooth key and the female steel tooth key arranged opposite to each other;

[0028] Figure 3 A schematic structural diagram of a male steel tooth key and a female steel tooth key arranged opposite to each other from another perspective;

[0029] Figure 4 It is a structural diagram of a male steel tooth key;

[0030] Figure 5 It is a structural diagram of the female steel tooth key;

[0031] Figure 6 A schematic structural diagram of the high-precision rapid splicing assembly of a prefabricated segmental beam provided by the present invention installed on a prefabricated segmental beam;

[0032] Among them: 1. Male steel tooth key; 11. Male steel tooth key plate body; 12. Protrusion; 13. First anchor steel bar; 2. Female steel tooth key; 21. Female steel tooth key plate body; 22. Second anchor steel bar; 23. Thin steel plate; 3. First splicing end mold integrated component plate; 4. Second splicing end mold integrated component plate; 5. Steel bar; 6. Prefabricated segmental beam; 7. Prestressed pipe hole. DETAILED DESCRIPTION

[0033] Example 1

[0034] refer to Figure 1 - Figure 6 , a prefabricated segmental beam high-precision rapid splicing end form integrated assembly, comprising:

[0035] The first splicing end mold integrated component plate 3 and the second splicing end mold integrated component plate 4 are correspondingly provided, and the first splicing end mold integrated component plate 3 and the second splicing end mold integrated component plate 4 are respectively cast on the two prefabricated segment beams 6;

[0036] A plurality of male steel tooth keys 1 and a plurality of female steel tooth keys 2 are arranged in a one-to-one correspondence, wherein the plurality of male steel tooth keys 1 are arranged on a first splicing end mold integrated component plate 3, and the plurality of female steel tooth keys 2 are arranged on a second splicing end mold integrated component plate 4;

[0037] Among them, when the first splicing end mold integrated component plate 3 and the second splicing end mold integrated component plate 4 are cast and manufactured, the paired matching of male steel tooth keys and female steel tooth keys and the matching of relative positions between multiple male steel tooth keys and multiple female steel tooth keys are completed in advance; when two pre-spliced prefabricated segment beams are spliced, the male steel tooth key 1 cooperates with the corresponding female steel tooth key 2 to achieve 0.2 mm level docking accuracy of the two prefabricated segment beams 6.

[0038] In this embodiment, both the male steel tooth key 1 and the female steel tooth key 2 are arranged in the cross-section compression zone of the prefabricated segment beam 6 under the ultimate bending bearing capacity state.

[0039] In this embodiment, the shapes of the first spliced end form integrated component plate 3 and the second spliced end form integrated component plate 4 are consistent with the cross-sectional shape of the beam body joint of the prefabricated segmental beam, so as to serve as the end formwork when casting the prefabricated segmental beam.

[0040] For example, the prefabricated segment beam 6 is a prefabricated segment T-beam, and the first spliced end mold integrated component plate 3 and the second spliced end mold integrated component plate 4 are in the shape of a T-shaped structure.

[0041] Among them, the first splicing end form integrated component plate 3 and the second splicing end form integrated component plate 4 play a role in stress diffusion between the steel tooth key and the beam concrete, avoiding the problem of local cracking of the beam concrete caused by stress concentration in the area around the steel tooth key, and enhancing the local shear strength of the splicing joint;

[0042] Preferably, a plurality of male steel tooth keys 1 are arranged on the first splicing end mold integrated component plate 3 , and a plurality of female steel tooth keys 2 are arranged on the second splicing end mold integrated component plate 4 .

[0043] Specifically, the number of the male steel tooth keys 1 and the female steel tooth keys 2 needs to be determined based on structural calculations.

[0044] For example, on a prefabricated segmental T-beam, according to calculation results, four male steel tooth keys 1 and four female steel tooth keys 2 can be provided, wherein three male steel tooth keys 1 are respectively provided on the wing plates of the T-shaped structure of the first spliced end mold integrated component plate 3, and are spaced apart in sequence near the middle position, wherein the middle male steel tooth key 1 is provided at the intersection center position of the web plate and the wing plate of the T-shaped structure of the first spliced end mold integrated component plate 3, and another male steel tooth key 1 is provided on the web plate of the T-shaped structure of the first spliced end mold integrated component plate 3, at the lower edge position of the cross-section compression zone, and is provided correspondingly to the male steel tooth key 1 located at the center position of the wing plate;

[0045] The four female steel tooth keys 2 are arranged on the second splicing end mold integrated component plate 4, corresponding to the four male steel tooth keys 1.

[0046] In this embodiment, a plurality of prestressed pipe holes can be provided as needed on one end of the vertical beam of the T-shaped structure of the first spliced end mold integrated component plate 3 and the second spliced end mold integrated component plate 4 away from the wing plate of the T-shaped structure.

[0047] The precast segment beam high-precision rapid splicing end mold integrated component provided in this embodiment achieves a 0.2mm-level component plate docking accuracy by combining multiple male steel tooth keys 1 and multiple female steel tooth keys 2 through UHPC casting. The spliced component plate is simple and efficient to manufacture and install, effectively resolving the matching contradiction between the millimeter-level docking accuracy requirements of the steel tooth keys and the millimeter-level manufacturing and docking accuracy of the concrete precast beam segment.

[0048] Specifically, when the prefabricated segmental beams to be assembled are cast and manufactured, a first splicing end mold integrated component plate 3 for installing a male steel tooth key 1 can be set at one end of the prefabricated segmental beam in the length direction according to actual conditions, and a second splicing end mold integrated component plate 4 for installing a female steel tooth key 2 can be set at the other end; the prefabricated segmental beams arranged at the starting end and the end end can be installed with the first splicing end mold integrated component plate 3 or the second splicing end mold integrated component plate 4 according to the usage conditions.

[0049] In this embodiment, the male steel tooth key 1 includes a male steel tooth key plate body 11, a raised portion 12 arranged at one end of the male steel tooth key plate body 11, and a plurality of first anchoring steel bars 13 arranged on the side of the male steel tooth key plate body 11 away from the raised portion 12; the plurality of first anchoring steel bars 13 are dispersedly arranged at an angle to the male steel tooth key plate body 11, wherein the male steel tooth key plate body 11 and the plurality of first anchoring steel bars 13 are cast in the prefabricated segment beam 6.

[0050] The female steel tooth key 2 includes a female steel tooth key plate body 21, a recessed portion arranged at one end of the female steel tooth key plate body 21, and a plurality of second anchoring steel bars 22 arranged on the side of the female steel tooth key plate body 21 away from the recessed portion. The plurality of second anchoring steel bars 22 are dispersedly arranged at an angle to the female steel tooth key plate body 21; a thin steel plate 23 is arranged on the outer side of the female steel tooth key plate body 21 corresponding to the recessed portion, and the female steel tooth key plate body 21 and the plurality of second anchoring steel bars 22 are cast in the prefabricated segment beam; the recessed portion of the female steel tooth key 2 is plugged into the raised portion of the male steel tooth key 1.

[0051] The thin steel plates 23 are attached to both sides of the recessed portion to prevent the UHPC from filling the groove area of the recessed portion when the UHPC is poured.

[0052] Specifically, the male steel tooth key plate body 11 is installed together with the casting template of the first splicing end mold integrated component plate 3, and is cast together with the first splicing end mold integrated component plate 3 as an integral component. The female steel tooth key plate body 21 is installed on the male tooth key plate body 11 of the above-mentioned cast integral component, and is cast as a whole with the second splicing end mold integrated component plate 4, realizing the matching prefabrication of the first splicing end mold integrated component and the second splicing end mold integrated component.

[0053] The high-precision rapid splicing end formwork integrated assembly for prefabricated segmental beams provided in this embodiment can improve the local strength of the concrete on the splicing surface and prevent the concrete in the compression zone of the splicing surface from prematurely collapsing.

[0054] In this embodiment, a plurality of distributed steel bars 5 are connected to one side of the first spliced end form integrated component plate 3 and the second spliced end form integrated component plate 4 cast on the prefabricated segment beam.

[0055] The high-precision rapid splicing end mold integrated assembly of the prefabricated segmental beam provided in this embodiment adopts multiple male and female paired steel tooth keys for bite-jointing, achieving 0.2mm-level relative positioning and bite accuracy of the steel tooth keys.

[0056] Among them, the main function of the steel tooth key is to ensure that when the joint of the tensile zone of the beam section is open at the ultimate state of the beam's bending bearing capacity, the beam can still maintain its overall stability through the effective shearing and biting of the steel tooth key in the compressive zone of the joint section.

[0057] Through the modular production and splicing of the integrated end mold components, the standardized independent production and industrialized mass production of prefabricated segmental beams are realized. Any independently produced prefabricated beam segments can be spliced quickly and accurately.

[0058] The male steel tooth key 1 and the female steel tooth key 2 are easy to process, can be spliced accurately and quickly, and have high strength; at the same time, the first splicing end mold integrated component plate 3 and the second splicing end mold integrated component plate 4 take into account the casting end template function, matching the installation accuracy and male-female matching of multiple steel tooth keys; the first splicing end mold integrated component plate 3 and the second splicing end mold integrated component plate 4 can also improve the local strength and crack resistance of the splicing surface.

[0059] Example 2

[0060] A high-precision and rapid splicing method for prefabricated segmental beams is provided, which uses the splicing method of the high-precision and rapid splicing end mold integrated assembly of prefabricated segmental beams provided in Example 1. The splicing method includes the following steps:

[0061] S10, using the first spliced end form integrated component plate or the second spliced end form integrated component plate as an embedded part and end formwork of a prefabricated segmental beam, and casting a single spliced end form integrated component;

[0062] S20, using the cast integrated end mold assembly as the bottom mold, matching and installing the male steel tooth key or the female steel tooth key, and then casting another end mold integrated assembly to obtain a pair of matched end mold assemblies, wherein the ambient temperature during the molding of the two end mold assemblies is consistent, and the relative positions of the multiple steel tooth keys can be synchronously matched without being affected by external temperature changes;

[0063] S30, erecting the formwork to cast the segmental T-beam with the end formwork splicing integrated assembly;

[0064] S40: Transport the segmental T-beams to the construction site and assemble them.

[0065] Application effect of the high-precision rapid splicing end mold integrated component and splicing method of prefabricated segmental beams provided by the present invention

[0066] In local beam segment assembly tests, the test beam segments were successfully spliced together, demonstrating that the splicing assembly fully achieved the desired effect. High-efficiency, high-precision, and high-quality splicing was also achieved in solid beam testing and applications. Destructive loading tests on 1:1 solid beams also demonstrated the safety and reliability of the splicing seams produced using this splicing assembly.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-precision, rapid-joining end-mold integrated assembly for prefabricated segmental beams, characterized in that: include: A first splicing end form integrated component plate and a second splicing end form integrated component plate are provided correspondingly, wherein the first splicing end form integrated component plate and the second splicing end form integrated component plate are cast on two prefabricated segment beams respectively; A plurality of male steel tooth keys and a plurality of female steel tooth keys, wherein the plurality of male steel tooth keys and the plurality of female steel tooth keys are arranged in a one-to-one correspondence; the plurality of male steel tooth keys are arranged on the first splicing end mold integrated component plate, and the plurality of female steel tooth keys are arranged on the second splicing end mold integrated component plate; Among them, when the first splicing end mold integrated component plate and the second splicing end mold integrated component plate are cast and manufactured, the paired matching of the male steel tooth keys and the female steel tooth keys and the matching of the relative positions between multiple male steel tooth keys and multiple female steel tooth keys are completed in advance; when two pre-spliced prefabricated segment beams are spliced, the male steel tooth keys cooperate with the corresponding female steel tooth keys to achieve a 0.2 mm level docking accuracy of the two prefabricated segment beams.

2. The high-precision rapid splicing end mold integrated assembly of prefabricated segmental beams according to claim 1 is characterized in that: The shapes of the first spliced end form integrated component plate and the second spliced end form integrated component plate are consistent with the cross-sectional shape of the beam joint of the prefabricated segmental beam, so as to serve as end formwork plates when casting and manufacturing the prefabricated segmental beam.

3. The high-precision rapid splicing end mold integrated assembly of prefabricated segmental beams according to claim 2 is characterized in that: The male steel tooth key and the female steel tooth key are both arranged in the cross-section compression zone under the ultimate state of the bending bearing capacity of the prefabricated segment beam.

4. The high-precision rapid splicing end mold integrated assembly of prefabricated segmental beams according to claim 3 is characterized in that: The male steel tooth key includes a male steel tooth key plate body, a raised portion arranged at one end of the male steel tooth key plate body, and a plurality of first anchoring steel bars arranged on the side of the male steel tooth key plate body away from the raised portion; the plurality of first anchoring steel bars are dispersedly arranged at an angle to the male steel tooth key plate body, wherein the male steel tooth key plate body and the plurality of first anchoring steel bars are cast in a prefabricated segment beam.

5. The high-precision rapid splicing end form integrated assembly of prefabricated segmental beams according to claim 4 is characterized in that: The female steel tooth key includes a female steel tooth key plate body, a recessed portion arranged at one end of the female steel tooth key plate body, and a plurality of second anchoring steel bars arranged on the side of the female steel tooth key plate body away from the recessed portion, and the plurality of second anchoring steel bars are dispersedly arranged at an angle to the female steel tooth key plate body; a thin steel plate is arranged on the outer side of the female steel tooth key plate body corresponding to the recessed portion, and the female steel tooth key plate body and the plurality of second anchoring steel bars are cast in the prefabricated segment beam; the recessed portion of the female steel tooth key is plugged into and fitted with the raised portion of the male steel tooth key.

6. The high-precision rapid splicing end form integrated assembly of prefabricated segmental beams according to claim 1 is characterized in that: The first spliced end form integrated component plate and the second spliced end form integrated component plate are both connected to a plurality of distributed steel bars on one side where they are cast on the prefabricated segment beam.

7. A high-precision and rapid splicing method for prefabricated segmental beams, characterized in that: A method for splicing a prefabricated segmental beam high-precision rapid splicing end form integrated assembly according to any one of claims 1 to 6 is used, the method comprising the following steps: S10, using the first spliced end form integrated component plate or the second spliced end form integrated component plate as an embedded part and end formwork of a prefabricated segmental beam, and casting a single spliced end form integrated component; S20, using the cast integrated end mold assembly as a bottom mold, matching and installing a male steel tooth key or a female steel tooth key, and then casting another end mold integrated assembly to obtain a pair of matched end mold assemblies, wherein the ambient temperature during the molding of the two end mold assemblies is consistent, and the relative positions of the multiple male steel tooth keys and the multiple female steel tooth keys can be synchronously matched without being affected by external temperature changes; S30, erecting formwork to cast the segmental beam with the end formwork splicing integrated assembly; S40: Transport the segmental beams to the construction site and assemble them.

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