Post-cast end structure of prefabricated hollow slab beam

Abstract

The utility model provides a post-cast end structure of a prefabricated hollow slab beam. The hollow slab girder comprises a slab girder body and a hollow hole which is formed in the slab girder body and penetrates through the slab girder body in the longitudinal direction. The plate girder body surrounds the hollow hole and comprises a body top, a body left part, a body right part and a body bottom; a pouring hole is formed in the top of the body at the end part of the hollow slab beam; the pouring hole is used for pouring concrete into the end part of the hollow slab beam; more than two first-class U-shaped steel bars are longitudinally arranged in the end part of the hollow slab beam, the left part of the body, the right part of the body and the bottom of the body at intervals respectively; the two ends of the first type of U-shaped steel bars extend into the hollow holes; steel bar combinations are arranged in the hollow holes, and are respectively connected with the first-class U-shaped steel bars at the left part, the right part and the bottom part of the body; a reliable end structure can be provided for the hollow slab beam, and the stress requirement of a single support at the end of the hollow slab beam is met.

Description

Technical Field

[0001] This utility model relates to the field of single-support slab beams used in small-span slab beam bridges, and in particular to a post-cast end structure for a precast hollow slab beam. Background Technology

[0002] In recent years, many small-span slab girder bridges have adopted a double-end bearing system, which makes it difficult to ensure uniform load distribution. Especially under dynamic loads or uneven foundation settlement, some bearings may bear excessive pressure while others become detached. This can lead to localized stress concentration in the beam and even cracking. The elevation and horizontal position of the bearings must be strictly aligned; otherwise, initial stress will occur. Furthermore, construction errors (such as deviations in the height of the bearing pads) can directly cause abnormal distribution of bearing reaction forces. Using double bearings at the beam ends means more potential failure points, requiring regular inspections of whether the bearings are properly tightened and whether the rubber bearings are aging and cracking, significantly increasing maintenance workload and costs. While single bearings do not present these problems, for hollow slab girders, the general process requires reserving space at both ends to remove the inner formwork, typically using plain concrete end caps, which cannot create a reliable end structure.

[0003] Figure 1 In the middle, the two ends of the hollow slab beam 2 are respectively supported on two supports 1; this may cause some of the problems mentioned above. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a post-cast end structure for precast hollow slab beams, which can provide a reliable end structure for the hollow slab beams and meet the stress requirements of a single support at the end of the hollow slab beam. To achieve the above technical objectives, the technical solution adopted in this utility model embodiment is as follows:

[0005] This utility model embodiment provides a post-cast end structure for a precast hollow slab beam; the hollow slab beam includes a slab beam body and a hollow hole disposed in the slab beam body and extending longitudinally through the slab beam body; the slab beam body surrounds the hollow hole and includes a top part, a left part, a right part, and a bottom part of the body;

[0006] At the end of the hollow slab beam, a pouring hole is provided at the top of the body; the pouring hole is used to pour concrete into the middle of the end of the hollow slab beam.

[0007] At the ends of the hollow slab beam, one or more first-type U-shaped steel bars are longitudinally spaced in the left, right and bottom parts of the body; both ends of the first-type U-shaped steel bars extend into the hollow holes.

[0008] At the ends of the hollow slab beam, there are steel reinforcement assemblies in the hollow holes, which are respectively connected to the first type of U-shaped steel reinforcement on the left side, right side and bottom of the body;

[0009] At the end of the hollow slab beam, end caps are installed in the hollow holes on both sides of the pouring hole; the concrete poured into the space between the two end caps at the end of the hollow slab beam through the pouring hole combines with the first type of U-shaped steel bars and steel reinforcement in the hollow holes to form a solid reinforced concrete structure at the end of the hollow slab beam.

[0010] Specifically, the steel reinforcement assembly includes a second type of U-shaped steel bar, transverse steel bars, and longitudinal steel bars; the second type of U-shaped steel bar extends from the pouring hole to the first type of U-shaped steel bar at the bottom of the body; the two ends of the second type of U-shaped steel bar are respectively tied to the two ends of the first type of U-shaped steel bar at the bottom of the body; the two ends of the upper transverse steel bar are respectively tied to the upper ends of the first type of U-shaped steel bar on the left and the upper ends of the first type of U-shaped steel bar on the right of the body; the two ends of the lower transverse steel bar are respectively tied to the lower ends of the first type of U-shaped steel bar on the left and the lower ends of the first type of U-shaped steel bar on the right of the body; longitudinal steel bars are respectively provided at the intersections of the second type of U-shaped steel bar with the upper and lower transverse steel bars, and are respectively tied to each other.

[0011] Furthermore, the number of the second type of U-shaped steel bars is the same as the number of the first type of U-shaped steel bars at the bottom of the body; the number of the transverse steel bars is twice the number of the first type of U-shaped steel bars on the left or right side of the body; and the number of the longitudinal steel bars is 4.

[0012] Furthermore, a support embedded steel plate is also provided in the middle part of the bottom of the main body.

[0013] Furthermore, the end cap is a reinforced concrete slab.

[0014] The beneficial effects of the technical solution provided by this utility model embodiment are: the post-cast end structure of the precast hollow slab beam proposed by this utility model can meet the force requirements of a single support at the end of the hollow slab beam, so that both ends of the hollow slab beam can be supported by a single support, avoiding the problems caused by double support. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an existing hollow slab beam and double-support structure.

[0016] Figure 2 This is a schematic diagram of the first type of U-shaped steel bar at the end of the hollow slab beam in an embodiment of this utility model, without bending.

[0017] Figure 3 This is a schematic diagram of the first type of U-shaped steel bar at the end of the hollow slab beam in an embodiment of this utility model after bending.

[0018] Figure 4 This is a schematic diagram of the steel cage structure at the end of the hollow slab beam in an embodiment of this utility model.

[0019] Figure 5 This is a schematic elevation view of the end of the hollow slab beam in an embodiment of this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] This utility model embodiment proposes a post-cast end structure for a precast hollow slab beam; the hollow slab beam 2 includes a slab beam body 201 and a hollow hole 202 disposed in the slab beam body 201 and extending longitudinally through the slab beam body 201; the slab beam body 201 surrounds the hollow hole 202 and includes a top part 2011, a left part 2012, a right part 2013, and a bottom part 2014;

[0022] At the end of the hollow slab beam 2, a casting hole 203 is provided at the top of the body 2011; the casting hole 203 is used to pour concrete into the hollow hole 202 at the end of the hollow slab beam 2.

[0023] At the ends of the hollow slab beam 2, two or more first-type U-shaped steel bars 204 are longitudinally spaced in the left part 2012, the right part 2013, and the bottom part 2014 of the body; both ends of the first-type U-shaped steel bars 204 extend into the hollow hole 202.

[0024] At the end of the hollow slab beam 2, a steel reinforcement assembly is provided in the hollow hole 202. The steel reinforcement assembly is connected to the first type of U-shaped steel reinforcement 204 of the left part 2012, the right part 2013, and the bottom part 2014 of the body respectively.

[0025] At the end of the hollow slab beam 2, end caps 205 are provided in the hollow holes 202 on both sides of the pouring hole 203; the concrete poured into the space between the two end caps 205 at the end of the hollow slab beam 2 through the pouring hole 203 combines with the first type of U-shaped steel bar 204 and steel bar combination in the hollow hole 202 to form the solid reinforced concrete structure 3 at the end of the hollow slab beam 2.

[0026] The solid reinforced concrete structure 3 formed above enables the hollow slab beam 2 to form a solid reinforced concrete structure at its end, and the solid reinforced concrete structure is firmly connected to the slab beam body 201. In this way, a single support 1 can be used to support the end of the hollow slab beam 2, which can meet the stress requirements of the single support at the end of the hollow slab beam. The single support 1 can be located at the lower middle position of the end of the hollow slab beam 2.

[0027] Specifically, the steel reinforcement assembly includes a second type of U-shaped steel bar 206, transverse steel bars 207, and longitudinal steel bars 208; the second type of U-shaped steel bar 206 extends from the pouring hole 203 to the first type of U-shaped steel bar 204 at the bottom of the body 2014; both ends of the second type of U-shaped steel bar 206 are respectively tied to both ends of the first type of U-shaped steel bar 204 at the bottom of the body 2014; both ends of the upper transverse steel bar 207 are respectively tied to the upper ends of the first type of U-shaped steel bar 204 at the left part 2012 and the right part 2013 of the body; both ends of the lower transverse steel bar 207 are respectively tied to the lower ends of the first type of U-shaped steel bar 204 at the left part 2012 and the right part 2013 of the body; longitudinal steel bars 208 are respectively provided at the intersections of the second type of U-shaped steel bar 206 with the upper and lower transverse steel bars 207, and are respectively tied to each other;

[0028] Specifically, the number of the second type of U-shaped steel bars 206 is the same as the number of the first type of U-shaped steel bars 204 at the bottom of the body 2014; the number of the transverse steel bars 207 is twice the number of the first type of U-shaped steel bars 204 at the left side of the body 2012 or the right side of the body 2013; and the number of the longitudinal steel bars 208 is 4.

[0029] In this embodiment, 2 to 3 first-type U-shaped steel bars 204 are longitudinally spaced in the left part 2012, the right part 2013, and the bottom part 2014 of the main body; the number of second-type U-shaped steel bars 206 is also 2 to 3.

[0030] The above-mentioned steel reinforcement combination can form a relatively stable steel cage structure with the first type of U-shaped steel reinforcement 204 pre-set in the end plate of the hollow slab beam 2, thereby improving the structural strength of the solid reinforced concrete structure 3 at the end of the hollow slab beam 2 and the firmness of the connection with the slab beam body 201.

[0031] More preferably, a support embedded steel plate 4 is provided in the middle part of the bottom 2014 of the main body; the support embedded steel plate 4 can make the end plate of the hollow slab beam 2 stably supported on the single support 1.

[0032] The following is a brief introduction to the construction process of the post-cast end structure of the precast hollow slab beam; after the hollow slab beam 2 is cast, the resulting structure is as follows: Figure 2 As shown; firstly, the section of the first type of U-shaped steel bar 204 extending into the hollow hole 202 is bent (as shown). Figure 3As shown), an inner end plate 205 is placed in the hollow hole 202; the end plate 205 is a reinforced concrete slab; then the steel bar segment of the first type U-shaped steel bar 204 extending into the hollow hole 202 is straightened, and then a steel bar combination including the second type U-shaped steel bar 206, transverse steel bar 207 and longitudinal steel bar 208 is placed in the hollow hole 202 at the end of the hollow slab beam 2, and after binding, a steel cage structure is formed (as shown). Figure 4 (As shown); then insert the outer end cap 205 into the hollow hole 202; finally, pour concrete through the pouring hole 203 at the top of the body 2011 (as shown). Figure 5 (As shown).

[0033] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A post-cast end structure for a precast hollow slab beam; the hollow slab beam (2) includes a slab beam body (201) and a hollow hole (202) disposed in the slab beam body (201) and extending longitudinally through the slab beam body (201); the slab beam body (201) surrounds the hollow hole (202) and includes a top part (2011), a left part (2012), a right part (2013), and a bottom part (2014); characterized in that, At the end of the hollow slab beam (2), a casting hole (203) is provided at the top of the body (2011); the casting hole (203) is used to pour concrete into the hollow hole (202) at the end of the hollow slab beam (2); At the ends of the hollow slab beam (2), two or more first-type U-shaped steel bars (204) are longitudinally spaced in the left part (2012), right part (2013) and bottom part (2014) of the body; both ends of the first-type U-shaped steel bars (204) extend into the hollow hole (202); At the end of the hollow slab beam (2), a steel reinforcement assembly is provided in the hollow hole (202), and the steel reinforcement assembly is connected to the first type of U-shaped steel reinforcement (204) of the left part (2012), the right part (2013) and the bottom part (2014) of the body respectively; At the end of the hollow slab beam (2), end caps (205) are provided in the hollow holes (202) on both sides of the pouring hole (203); the concrete poured into the two end caps (205) at the end of the hollow slab beam (2) through the pouring hole (203) is combined with the first type of U-shaped steel bar (204) and steel bar combination in the hollow hole (202) to form a solid reinforced concrete structure (3) at the end of the hollow slab beam (2).

2. The post-cast end structure of the precast hollow slab beam as described in claim 1, characterized in that, The steel reinforcement assembly includes a second type of U-shaped steel bar (206), transverse steel bars (207), and longitudinal steel bars (208); the second type of U-shaped steel bar (206) extends from the casting hole (203) towards the first type of U-shaped steel bar (204) at the bottom of the body (2014); the two ends of the second type of U-shaped steel bar (206) are respectively tied to the two ends of the first type of U-shaped steel bar (204) at the bottom of the body (2014); the two ends of the upper transverse steel bar (207) are respectively tied to the first type of U-shaped steel bar (204) on the left side of the body (2012). The upper end of the first type U-shaped steel bar (204) and the upper end of the right side of the body (2013) are tied together; the two ends of the lower transverse steel bar (207) are tied together with the lower ends of the first type U-shaped steel bar (204) on the left side of the body (2012) and the lower ends of the first type U-shaped steel bar (204) on the right side of the body (2013); longitudinal steel bars (208) are set at the intersection of the second type U-shaped steel bar (206) with the upper transverse steel bar (207) and the lower transverse steel bar (207), and are tied together.

3. The post-cast end structure of the precast hollow slab beam as described in claim 2, characterized in that, The number of the second type of U-shaped steel bars (206) is the same as the number of the first type of U-shaped steel bars (204) at the bottom of the body (2014); the number of the transverse steel bars (207) is twice the number of the first type of U-shaped steel bars (204) at the left side (2012) or right side (2013) of the body; the number of the longitudinal steel bars (208) is 4.

4. The post-cast end structure of the precast hollow slab beam as described in any one of claims 1 to 3, characterized in that, The bottom (2014) of the main body is also provided with a support embedded steel plate (4).

5. The post-cast end structure of the precast hollow slab beam as described in any one of claims 1 to 3, characterized in that, The end cap (205) is a reinforced concrete slab.

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