Prefabricated concrete primary and secondary beam connecting node free of mold and installation support

Abstract

The utility model discloses a prefabricated concrete primary and secondary beam connecting node free of a mold, installation and support, which is characterized in that an installation boss is arranged at the bottom of a prefabricated primary beam, so that when the prefabricated secondary beam is erected on the prefabricated primary beam, the installation boss can support the prefabricated secondary beam, and the installation and the removal of a temporary installation support are avoided; meanwhile, cast-in-place connecting grooves are formed in the ends of the prefabricated secondary beams, cast-in-place space is provided for cast-in-place concrete, so that mounting and dismounting of formworks are omitted, construction efficiency is improved, construction cost is reduced, main beam reserved steel bars in the prefabricated main beams and secondary beam steel bars in the prefabricated secondary beams do not stretch out of the prefabricated main beams and the prefabricated secondary beams, and construction cost is reduced. The prefabricated main beams and the prefabricated secondary beams are convenient to transport and maintain; and meanwhile, the steel bar connectors are arranged at the ends of the main beam reserved steel bars, so that the secondary beam steel bars can be connected with the main beam reserved steel bars through the steel bar connectors, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building engineering, in particular to a prefabricated main and secondary beam connection node. Background Art

[0002] Prefabricated buildings refer to buildings that are partially or completely prefabricated in factories, such as beams and columns, and then transported to the construction site by appropriate means of transportation. Reliable installation methods and installation machinery are used to assemble the components to form a functional building. Prefabricated buildings have the advantages of high construction efficiency, short construction period, and reduced construction noise and dust pollution, and are widely used in the construction industry.

[0003] In existing prefabricated buildings, main beams and secondary beams are usually prefabricated separately, and the prefabricated main and secondary beams are cast in situ at the connection nodes. With this connection node, temporary installation supports are required to erect and fix the prefabricated secondary beams, and formwork is used to assist in the cast-in-situ connection nodes between the prefabricated main beams and the prefabricated secondary beams. After the prefabricated secondary beams are connected to the prefabricated main beams, the formwork and temporary installation supports are removed, resulting in increased construction costs and extended construction period.

[0004] A Chinese patent with announcement number CN 217299272 U discloses a prefabricated main-secondary beam connection node, which includes a prefabricated main beam and a prefabricated secondary beam, wherein the prefabricated main beam is provided with at least one notch with a top extending therethrough; a first steel bar assembly is pre-embedded in the prefabricated main beam, and the upper part of the first steel bar assembly extends out of the prefabricated main beam; a second steel bar assembly is pre-embedded in the prefabricated secondary beam, and the upper part of the second steel bar assembly extends out of the prefabricated secondary beam; the prefabricated secondary beam is arranged at the side end of the prefabricated main beam and corresponds one-to-one to the notch, and the second steel bar assembly extends into the notch and is connected to the first steel bar assembly, thereby connecting the prefabricated main beam and the prefabricated secondary beam.

[0005] However, in the prefabricated main and secondary beam connection nodes provided by the above scheme, the embedded steel bars in the prefabricated main beam and the prefabricated secondary beam need to extend out of the prefabricated main beam and the prefabricated secondary beam, which is inconvenient for transporting the prefabricated main beam and the prefabricated secondary beam. At the same time, during the transportation process and at the construction site, the protruding steel bars are likely to cause damage to people and objects.

[0006] Therefore, there is an urgent need in the art for a primary-secondary beam connection node that has a simple structure, low construction cost, and is easy to transport, construct, and maintain. Utility Model Content

[0007] In view of the defects of the prior art, the purpose of the utility model is to provide a precast concrete primary and secondary beam connection node which is simple in structure, low in construction cost, easy to construct, transport and maintain, and does not require formwork or installation support.

[0008] In order to achieve the above-mentioned purpose, the utility model provides a precast concrete primary and secondary beam connection node without formwork and installation support, including a precast primary beam and a precast secondary beam.

[0009] The end of the prefabricated secondary beam that cooperates with the prefabricated main beam is provided with a U-shaped cast-in-place connection groove for connecting and cooperating with the prefabricated main beam, and the cast-in-place connection groove is provided with secondary beam steel bars, and the secondary beam steel bars extend to the end of the cast-in-place connection groove and do not extend out of the cast-in-place connection groove.

[0010] The prefabricated main beam is provided with reserved main beam steel bars, which extend to the side ends of the main beam and do not extend out of the main beam. A steel bar connector is provided at the end of the reserved main beam steel bars for connecting with the secondary beam steel bars. A mounting boss is provided at the bottom of the prefabricated main beam for erecting the prefabricated secondary beam.

[0011] Furthermore, the secondary beam reinforcement includes secondary beam bottom reinforcement and bent reinforcement arranged on the secondary beam bottom reinforcement for connecting the prefabricated main beam.

[0012] Furthermore, the bent steel bars include first bent steel bars and second bent steel bars that are relatively staggered, and the bent sections of the first bent steel bars and the second bent steel bars are respectively arranged at both ends of the cast-in-place connecting groove.

[0013] Furthermore, the straight section of the first bent steel bar can be inserted into the steel bar connector.

[0014] Furthermore, threads matching the reserved steel bars of the main beam and the first bent steel bars are respectively provided at both ends of the steel bar connector.

[0015] Furthermore, the cross-section of the cast-in-place connecting groove is U-shaped, one end that cooperates with the prefabricated main beam forms an open end, the other end forms a closed end, and the top surface is provided with a cast-in-place port.

[0016] Furthermore, a keyway is provided at the closed end of the cast-in-place connecting groove.

[0017] Furthermore, a height-adjusting pad is provided between the mounting boss and the prefabricated secondary beam.

[0018] Furthermore, a plurality of the reserved steel bars of the main beam are evenly arranged along the width direction of the prefabricated main beam in the area where the prefabricated main beam cooperates with the prefabricated secondary beam.

[0019] Furthermore, a plurality of the secondary beam steel bars are evenly arranged in the prefabricated secondary beam along the length direction of the prefabricated secondary beam.

[0020] The utility model provides a precast concrete main-secondary beam connection node which is free of formwork and installation support. A mounting boss is provided at the bottom of the precast main beam, so that when the precast secondary beam is erected on the precast main beam, the mounting boss can support the precast secondary beam, thereby eliminating the need for installation and removal of temporary installation supports. At the same time, a cast-in-place connecting groove is provided on the precast secondary beam to provide a cast-in-place space for cast-in-place concrete, and at the same time, the groove wall limits the scope of cast-in-place, thereby eliminating the need for installation and removal of formwork, thereby improving construction efficiency and reducing construction costs.

[0021] Furthermore, the utility model provides a precast concrete main-secondary beam connection node that is free of formwork and installation support. The main beam reserved steel bars in the precast main beam and the secondary beam steel bars in the precast secondary beam do not extend out of the precast main and secondary beams, so that the precast main beam and the precast secondary beam are easy to transport, and the main beam reserved steel bars and the secondary beam steel bars do not extend out and be exposed outside the precast main and secondary beams, thereby facilitating maintenance. At the same time, a steel bar connector is provided at the end of the main beam reserved steel bar, so that the secondary beam steel bar can be connected to the main beam reserved steel bar through the steel bar connector, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0023] Figure 1 A front cross-sectional view of the connection node of the precast concrete primary and secondary beams provided by the utility model without formwork or installation support;

[0024] Figure 2 A top view of the connection node of the precast concrete primary and secondary beams provided by the utility model without formwork or installation support

[0025] Figure 3 It is a structural schematic diagram of the cast-in-place connection groove in the utility model;

[0026] Figure 4 It is a schematic diagram of the arrangement of the first bent steel bar and the second bent steel bar in the utility model.

[0027] Reference numerals:

[0028] 1. Prefabricated main beam; 11. Mounting boss; 12. Reserved steel bars for the main beam; 13. Steel bar connector; 14. Height adjustment pad;

[0029] 2. Precast secondary beam; 21. Connection end; 22. Cast-in-place connection groove; 221. Open end; 222. Closed end; 223. Cast-in-place port; 224. Groove wall; 225. Keyway; 23. Secondary beam reinforcement; 231. Secondary beam bottom reinforcement; 232. First bent reinforcement; 2321. First bent section; 2322. First straight section; 233. Second bent reinforcement; 2331. Second bent section; 2332. Second straight section; 24. Precast section; DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0031] See also Figure 1 and Figure 2 , which shows an example of a precast concrete primary and secondary beam connection node provided by the utility model without formwork and installation support.

[0032] As can be seen from the figure, the precast concrete main and secondary beam connection node without formwork and installation support in this example mainly includes a precast main beam 1 and a precast secondary beam 2.

[0033] The bottom of the prefabricated main beam 1 is provided with a mounting boss 11 for erecting a prefabricated secondary beam 2, so that the connecting end 21 of the prefabricated secondary beam 2 is erected on the prefabricated main beam 1 and cooperates with the mounting boss 11. The mounting boss 11 can support the prefabricated secondary beam 2, eliminating the need for installation and removal of temporary installation supports; the end of the prefabricated secondary beam 2 that cooperates with the prefabricated main beam 1 is provided with a cast-in-place connecting groove 22 for connecting and cooperating with the prefabricated main beam 1, and a secondary beam steel bar 23 is arranged in the cast-in-place connecting groove 22. At the same time, the prefabricated main beam 1 is provided with a main beam reserved steel bar 12, and the end of the main beam reserved steel bar 12 is provided with a steel bar connector 13 for connecting and cooperating with the secondary beam steel bar 23, so that the secondary beam steel bar 23 and the main beam reserved steel bar 12 are connected through the steel bar connector 13, thereby improving construction efficiency, and the cast-in-place connecting groove 22 limits the pouring range and pouring shape of the cast-in-place concrete, thereby eliminating the need for installation and removal of the formwork and reducing construction costs.

[0034] Specifically, the width of the mounting boss 11 at the bottom of the prefabricated main beam 1 is adapted to or slightly larger than the width of the prefabricated secondary beam 2, so that when the prefabricated secondary beam 2 and the prefabricated main beam 1 are perpendicular to each other in a horizontal plane, the connecting end 21 of the prefabricated secondary beam 2 can be erected on the mounting boss 11 on the prefabricated main beam 1, and the mounting boss 11 can support the prefabricated secondary beam 2. At the same time, when the prefabricated secondary beam 2 is respectively erected on two adjacent prefabricated main beams 1, the mounting bosses 11 on the two adjacent prefabricated main beams 1 can cooperate to support the prefabricated secondary beam 2 and ensure that the prefabricated secondary beam 2 is horizontal, so that the connection between the prefabricated secondary beam 2 and the prefabricated main beam 1 is stable, eliminating the installation and removal of temporary installation supports.

[0035] Furthermore, the setting height of the mounting boss 11 on the prefabricated main beam 1 is adapted to the height of the prefabricated secondary beam 2, so that the prefabricated secondary beam 2 is erected on the prefabricated main beam 1. When the mounting boss 11 abuts against the connecting end 21 of the prefabricated secondary beam 2, the top of the prefabricated main beam 1 can be flush with the top of the prefabricated secondary beam 2, thereby making the connecting node structure of the prefabricated main beam 1 and the prefabricated secondary beam 2 smooth and stable.

[0036] In order to prevent the prefabricated secondary beam 2 from not being able to maintain horizontality when erected on the prefabricated main beam 1, causing inclination, or there being an error between the setting height of the mounting boss 11 on the prefabricated main beam 1 and the height of the connecting end 21, resulting in the top of the prefabricated main beam 1 not being flush with the top of the prefabricated secondary beam 2, a height adjustment pad 14 is provided between the mounting boss 11 and the prefabricated secondary beam 2.

[0037] Furthermore, a height adjustment pad 14 is arranged on the mounting boss 11, and is preferably composed of a cement mortar pad to facilitate adjustment of the height of the height adjustment pad 14 itself, so that the height adjustment pad 14 can cooperate with the prefabricated secondary beam 2 and the mounting boss 11 to adjust the height of the prefabricated secondary beam 2 erected on the prefabricated main beam 1, so that the top of the prefabricated secondary beam 2 and the prefabricated main beam 1 are flush, thereby improving the stability and flatness of the connection node.

[0038] Here, the height adjustment pads 14 arranged at both ends of the mounting boss 11 can be set to different thicknesses according to specific circumstances, so that the height adjustment pads 14 at both ends are respectively abutted against the connecting ends 21 to adjust the heights of the two ends of the prefabricated secondary beam 2 so that the prefabricated secondary beam 2 remains horizontal.

[0039] Furthermore, a cast-in-place connecting groove 22 is provided at the end of the prefabricated secondary beam 2 that cooperates with the prefabricated main beam 1, so that when the prefabricated secondary beam 2 is erected on the prefabricated main beam 1 through the connecting end 21, the cast-in-place connecting groove 22 abuts against the side end of the prefabricated main beam 1, facilitating the connection and cooperation with the prefabricated main beam 1 through the cast-in-place connecting groove 22.

[0040] Specifically, see Figure 2 and Figure 3 The cross-section of the cast-in-place connecting groove 22 is U-shaped, and an open end 221 is formed at one end abutting against the precast main beam 1, and the other end is closed by the precast section 24 of the precast secondary beam 2 to form a closed end 222. A cast-in-place port 223 is provided on the top surface of the precast secondary beam 2, so that when concrete is cast in-place from the cast-in-place port 223, the groove walls 224 on both sides of the cast-in-place connecting groove 22, the closed end 222 and the precast main beam 1 can limit the cast-in-place range of the concrete and control the cast-in-place shape of the concrete at the same time. In addition, the concrete is connected to the precast section 24 through the closed end 222 in the cast-in-place connecting groove 22, and is connected to the precast main beam 1 through the open end 221, thereby eliminating the need to install and remove the formwork.

[0041] Furthermore, a plurality of secondary beam steel bars 23 evenly arranged along the length direction of the prefabricated secondary beam 2 are provided in the cast-in-place connecting groove 22. The secondary beam steel bars 23 include a secondary beam bottom bar 231 arranged at the bottom of the bent steel bars for reinforcing the prefabricated secondary beam 2 and a bent steel bar arranged on the secondary beam bottom bar 231 for connecting and cooperating with the prefabricated main beam 1. The bent steel bars include a first bent steel bar 232 and a second bent steel bar 233.

[0042] Specifically, see Figure 4The first bent steel bar 232 and the second bent steel bar 233 are arranged in a staggered manner relative to each other. The first bent section 2321 of the first bent steel bar 232 is arranged at the closed end 222 of the cast-in-place connecting groove 22, and the first straight section 2322 extends to the open end 221 of the cast-in-place connecting groove 22, and does not extend out of the open end 221, so that the first straight section 2322 of the first bent steel bar 232 can be connected and cooperated with the precast main beam 1; correspondingly, the second bent section 2331 of the second bent steel bar 233 is arranged to the open end 221 of the cast-in-place connecting groove 22, and the second straight section 2332 extends from the precast section 24 of the precast secondary beam 2.

[0043] Here, the specific structure and bending method of the first bent steel bar 232 and the second bent steel bar 233 are not limited. For example, the bending sections of the first bent steel bar 232 and the second bent steel bar 233 can be semicircular hooks, straight hooks or oblique hooks, or can also be transformed into anchor end plate forms.

[0044] Therefore, the secondary beam reinforcement 23 in the prefabricated secondary beam 2 does not extend out of the cast-in-place connection groove 22 and is not exposed outside the prefabricated secondary beam 2, thereby making the prefabricated secondary beam 2 easy to transport and maintain.

[0045] Furthermore, the secondary beam reinforcement 23 in the prefabricated secondary beam 2 is connected and cooperated with the main beam reserved reinforcement 12 in the prefabricated main beam 1 to strengthen the connection node strength between the prefabricated secondary beam 2 and the prefabricated main beam 1.

[0046] In coordination therewith, the prefabricated main beam 1 is provided with a plurality of main beam reserved steel bars 12 which are evenly arranged along the width direction of the prefabricated main beam 1. The main beam reserved steel bars 12 extend to the side ends of the prefabricated main beam 1 and do not extend out and are exposed outside the prefabricated main beam 1, so that the prefabricated main beam 1 is easy to transport and maintain.

[0047] Furthermore, a steel bar connector 13 is provided at the end of the main beam reserved steel bar 12, and threads matching the main beam reserved steel bar 12 and the first bent steel bar 232 are provided at both ends of the steel bar connector 13, so that the first straight section 2322 of the first bent steel bar 232 is connected to the main beam reserved steel bar 12 through the steel bar connector 13, thereby connecting the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0048] The first bent steel bar 232 is not embedded in the prefabricated secondary beam 2, but transported to the construction site separately. On site, the first straight section 2322 of the first bent steel bar 232 is twisted and inserted into the steel bar connector 13, and the first bent section 2321 is arranged on the closed end 222 side of the cast-in-place connecting groove 22.

[0049] Therefore, after the reserved main beam steel bars 12 in the prefabricated main beam 1 and the first bent steel bars 232 in the prefabricated secondary beam 2 are connected through the steel bar connector 13, concrete is cast in the cast-in-place connecting groove 22 to connect the prefabricated main beam 1 and the prefabricated secondary beam 2, and the strength of the connection node between the prefabricated main beam 1 and the prefabricated secondary beam 2 is ensured.

[0050] Furthermore, a keyway 225 is provided on the closed end 222 of the cast-in-place connecting groove 22, and the keyway 225 is composed of a protrusion or a groove on the closed end 222, so that after pouring concrete in the cast-in-place connecting groove 22, the poured concrete is tightly connected to the prefabricated section 24, thereby improving the shear resistance of the connecting part, thereby improving the overall stiffness and bearing capacity of the connection node of the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0051] The following examples illustrate the working process of the present invention in a specific application. It should be noted that the following content is only a specific application example of the present solution and does not constitute a limitation to the present solution.

[0052] The prefabricated secondary beam 2 and the prefabricated main beam 1 are transported to the construction site.

[0053] The prefabricated secondary beam 2 is mounted on the prefabricated main beam 1 through the connecting end 21 , and the mounting boss 11 cooperates with the connecting end 21 to support the prefabricated secondary beam 2 , eliminating the need for temporary mounting support.

[0054] At the same time, a height adjustment pad 14 is arranged between the prefabricated secondary beam 2 and the mounting boss 11 to adjust the height of the prefabricated secondary beam 2 on the prefabricated main beam 1 so that the top of the prefabricated secondary beam 2 and the prefabricated main beam 1 are flush, thereby improving the stability and flatness of the connection node.

[0055] Next, the first straight section 2322 of the first bent steel bar 232 is twisted and inserted into the steel bar connector 13 to connect the prefabricated main beam 1 and the prefabricated secondary beam 2.

[0056] Furthermore, concrete is cast in place in the cast-in-place opening 223 on the top surface of the precast secondary beam 2 into the cast-in-place connecting groove 22, and the groove walls 224 on both sides of the cast-in-place connecting groove 22, the closed end 22 and the precast main beam 1 limit the cast-in-place range of the concrete, and at the same time control the cast-in-place shape of the concrete, and the concrete is connected to the precast section 24 through the closed end 222 and the key groove 225 in the cast-in-place connecting groove 22, and is connected to the precast main beam 1 through the open end 221, eliminating the need for a formwork.

[0057] Thus, the precast main beam 1 and the precast secondary beam 2 are connected.

[0058] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A precast concrete primary and secondary beam connection node without formwork or installation support, comprising a precast primary beam and a precast secondary beam, characterized in that: The end of the prefabricated secondary beam that cooperates with the prefabricated main beam is provided with a U-shaped cast-in-place connection groove for connecting and cooperating with the prefabricated main beam, and the cast-in-place connection groove is provided with secondary beam steel bars, and the secondary beam steel bars extend to the end of the cast-in-place connection groove and do not extend out of the cast-in-place connection groove. The prefabricated main beam is provided with reserved main beam steel bars, which extend to the side ends of the main beam and do not extend out of the main beam. A steel bar connector is provided at the end of the reserved main beam steel bars for connecting with the secondary beam steel bars. A mounting boss is provided at the bottom of the prefabricated main beam for erecting the prefabricated secondary beam.

2. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 1 is characterized in that: The secondary beam reinforcement includes secondary beam bottom reinforcement and bent reinforcement arranged on the secondary beam bottom reinforcement for connecting the prefabricated main beam.

3. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 2 is characterized in that: The bent steel bars include first bent steel bars and second bent steel bars that are relatively staggered, and the bent sections of the first bent steel bars and the second bent steel bars are respectively arranged at two ends of the cast-in-place connecting groove.

4. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 3 is characterized in that: The straight section of the first bent steel bar can be inserted into the steel bar connector.

5. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 4 is characterized in that: The two ends of the steel bar connector are respectively provided with threads matching the reserved steel bars of the main beam and the first bent steel bars.

6. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 1 is characterized in that: The cross section of the cast-in-place connection groove is U-shaped, one end of which cooperates with the prefabricated main beam forms an open end, the other end forms a closed end, and the top surface is provided with a cast-in-place port.

7. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 6 is characterized in that: The closed end of the cast-in-place connecting groove is provided with a key groove.

8. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 1 is characterized in that: A height adjustment pad is provided between the mounting boss and the prefabricated secondary beam.

9. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 1, characterized in that: A plurality of the reserved steel bars of the main beam are evenly arranged along the width direction of the prefabricated main beam in the area where the prefabricated main beam cooperates with the prefabricated secondary beam.

10. The precast concrete primary and secondary beam connection node without formwork or installation support according to claim 1, characterized in that: A plurality of secondary beam steel bars are evenly arranged in the prefabricated secondary beam along the length direction of the prefabricated secondary beam.

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