Slab-pile bridge suitable for underpass railway bridge

Abstract

The utility model discloses a sheet-pile bridge suitable for an underpass railway bridge, which relates to the technical field of railway building construction, and comprises a pile plate, a pile foundation and a support rib cage, the pile plate is provided with a connecting hole, and the upper end of the connecting hole is provided with a top rib net; the upper ends of the pile foundations are fixedly arranged in the connecting holes and located below the top rib net, and the lower ends of the pile foundations are used for being buried in a foundation. The supporting rib cage comprises a connecting rib, an inclined rib, a ring rib and a stirrup; the connecting rib comprises a first section, a second section and a third section which are connected in sequence; the second sections and the third sections are located above the pile foundation, the third sections extend in the direction close to the central axis of the pile foundation, the stirrups are connected to the second sections, and the two ends of the inclined ribs are connected to the second sections and the third sections correspondingly to form a triangular structure, so that the supporting rib cage forms a self-stabilizing structure; the annular ribs are connected to the third sections, the at least two third sections and the annular ribs form a supporting net, the supporting net abuts against the lower portion of the top rib net, the additional load of the foundation in the construction process is reduced, and the influence on the railway bridge structure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of railway construction technology, and in particular to a pile-slab bridge suitable for passing under railway bridges. Background Technology

[0002] With the continuous development of urbanization and railway transportation, new roads are increasingly being constructed by passing under railway bridges to achieve grade separation and reduce traffic conflicts. Pile-slab bridges are one such method for roads to pass under railway bridges. Currently, pile-slab bridges have two construction methods: fully cast-in-place and fully precast. Fully precast pile-slab bridges use a soil-displacement method for pile driving, which can lead to problems such as lateral soil extrusion and heave, threatening the safety of the railway bridge structure. Furthermore, when precast pile slabs and pile foundations are assembled on-site, the pile foundations are placed directly on the ground, increasing the additional load on the foundation and thus affecting the operational safety of the railway. Conversely, in the construction of fully cast-in-place pile-slab bridges, the construction loads from supports and formwork act directly on the foundation, increasing the additional load on the foundation and further affecting the safety of the railway bridge structure. Utility Model Content

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a pile-slab bridge suitable for passing under railway bridges, thereby reducing the additional load on the foundation during construction and reducing the impact on the railway bridge structure.

[0004] According to an embodiment of this utility model, a pile-slab bridge suitable for underpassing railway bridges is provided, comprising: a pile slab, a pile foundation, and a support cage; the pile slab has a first direction, a second direction, and a third direction that are mutually perpendicular, the third direction being vertical; the pile slab is provided with connecting holes, and a top reinforcement mesh is provided at the upper end of the connecting holes; the upper end of the pile foundation is fixedly disposed in the connecting holes and located below the top reinforcement mesh, and its lower end is used for embedding in the foundation; the support cage is disposed in the connecting holes, and the support cage includes connecting bars, diagonal bars, ring bars, and stirrups; the connecting bars include a first segment, a second segment, and a third segment connected in sequence; wherein, the first segment and the second segment extend along the third direction respectively, and the first segment extends into the pile foundation, the... The second and third segments are located above the pile foundation, with the third segment extending towards the central axis of the pile foundation. At least two connecting bars are provided, spaced apart around the central axis of the pile foundation. Stirrups are connected to each of the second segments. The number of diagonal bars is the same as the number of connecting bars, with each diagonal bar connected to each connecting bar. The two ends of each diagonal bar are respectively connected to the second and third segments, forming a triangular structure to enable the support cage to form a self-stabilizing structure. Ring bars are located above the third segment and connected to each of the third segments. At least two of the third segments and the ring bars form a support net, which abuts against the bottom of the top reinforcement net.

[0005] The pile-slab bridge applicable to railway underpasses described in this utility model has at least the following beneficial effects: Since the third segment of the connecting reinforcement extends from one end of the second segment towards the central axis near the pre-set hole, and the two ends of the diagonal reinforcement are respectively connected to the second and third segments, the second segment, the third segment, and the diagonal reinforcement form a triangular structure. Through the triangular structure formed between each diagonal reinforcement and each connecting reinforcement, and the stirrups connected to each connecting reinforcement, the supporting reinforcement cage forms a self-stabilizing structure. Since the first segment extends into the pile foundation, when pouring the pile foundation, the first segment is placed in the pouring hole of the pile foundation. Because the supporting reinforcement cage forms a self-stabilizing structure, there is no need to set up additional devices on the foundation to stabilize the supporting reinforcement cage, reducing the additional load on the foundation during construction and minimizing the impact on the existing railway bridge structure. With the ring reinforcement located above the third segment and connected to each third segment, at least two third segments and the ring reinforcement form a supporting net. The top reinforcement net of the connecting hole directly abuts against the supporting net. Due to the self-stabilizing structure of the supporting reinforcement cage, the reliability of the supporting net in bearing the top reinforcement net is improved. The load of the pile sheet is directly transferred to the support mesh of the support cage through the top reinforcement mesh, and then to the pile foundation through the support cage. That is, the load of the pile sheet is only transferred to the pile foundation, and then to the ground. There is no need to set up additional devices in the ground to support the pile sheet, which reduces the additional load on the ground during the construction process and reduces the impact on the railway bridge structure.

[0006] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided, wherein one end of the inclined bar is located at the end of the third segment away from the second segment, and the other end of the inclined bar is located at the end of the second segment close to the first segment, and the second segment, the third segment, and the inclined bar together form the triangular structure.

[0007] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided, wherein the two ends of the inclined bar have a first bend and a second bend, the first bend extends along the third direction and is connected to the second segment, the second bend is located below the third segment and is connected to the third segment.

[0008] According to the present invention, a pile-slab bridge suitable for passing under a railway bridge is provided, wherein the stirrups surround the outer periphery of at least two second segments and are connected to each second segment, and at least two stirrups are provided, and the at least two stirrups are spaced apart along the third direction to form a columnar structure.

[0009] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges includes a top reinforcement mesh comprising at least two top transverse reinforcements and at least two top longitudinal reinforcements. The top longitudinal reinforcements extend along a first direction, and at least two top longitudinal reinforcements are spaced apart along a second direction. The top transverse reinforcements extend along the second direction, and at least two top transverse reinforcements are spaced apart along the first direction. The top transverse reinforcements are located above the top longitudinal reinforcements.

[0010] According to the present invention, a pile-slab bridge suitable for passing under a railway bridge is provided at least two sets of bottom transverse reinforcement groups and at least two sets of bottom longitudinal reinforcement groups at the end of the connecting hole away from the top reinforcement mesh. The bottom longitudinal reinforcement groups extend along the first direction, and at least two sets of bottom longitudinal reinforcement groups are spaced apart along the second direction. The bottom transverse reinforcement groups extend along the second direction, and at least two sets of bottom transverse reinforcement groups are spaced apart along the first direction.

[0011] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided, wherein the bottom horizontal reinforcement group includes spliced ​​horizontal reinforcement and two precast horizontal reinforcements. The two precast horizontal reinforcements are located at both ends of the connecting hole along the second direction, and the two ends of the spliced ​​horizontal reinforcement are respectively connected to the two precast horizontal reinforcements.

[0012] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided, wherein the bottom longitudinal reinforcement group includes spliced ​​longitudinal reinforcement and two precast longitudinal reinforcements. The two precast longitudinal reinforcements are located at both ends of the connecting hole along the first direction, and the two ends of the spliced ​​longitudinal reinforcement are respectively connected to the two precast longitudinal reinforcements.

[0013] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided, wherein at least two sets of pile slabs are provided, and at least two sets of pile slabs are spaced apart along the second direction, and a post-cast strip is formed between two adjacent sets of pile slabs, and the post-cast strip extends along the third direction.

[0014] According to the present invention, a pile-slab bridge suitable for underpassing railway bridges is provided in the post-cast strip, and post-cast reinforcement mesh is provided at both ends of the post-cast strip along the third direction. The post-cast reinforcement mesh includes at least two sets of post-cast reinforcement groups and at least two post-cast longitudinal reinforcements. The post-cast longitudinal reinforcements extend along the first direction, and at least two post-cast longitudinal reinforcements are spaced apart along the second direction. The post-cast reinforcement groups extend along the second direction, and at least two post-cast reinforcement groups are spaced apart along the first direction.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is an axonometric view of a pile-slab bridge suitable for underpassing railway bridges in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of a pile-slab bridge suitable for underpassing railway bridges in an embodiment of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0020] Figure 4 for Figure 2 A sectional view of the BB section;

[0021] Figure 5 for Figure 4 A sectional view of the CC section;

[0022] Figure 6 This is a schematic diagram of the bottom horizontal rib group and the bottom longitudinal rib group in an embodiment of this utility model;

[0023] Figure 7 This is a schematic diagram of the post-cast strip in an embodiment of the present invention.

[0024] Figure label:

[0025] 100 for pile slab; 110 for connecting hole; 120 for top reinforcement mesh; 121 for top transverse reinforcement; 122 for top longitudinal reinforcement; 130 for bottom transverse reinforcement group; 131 for precast transverse reinforcement; 140 for bottom longitudinal reinforcement group; 141 for spliced ​​longitudinal reinforcement; 142 for precast longitudinal reinforcement; 150 for beam slab;

[0026] Support cage 200; connecting bar 210; first section 211; second section 212; third section 213; diagonal bar 220; first bend 221; second bend 222; ring bar 230; stirrup 240;

[0027] 300mm pile foundation;

[0028] Post-pouring strip 400;

[0029] Post-cast reinforcement mesh 500; Post-cast reinforcement group 510; Precast reinforcement 511; Spliced ​​reinforcement 512; Post-cast longitudinal reinforcement 520. Detailed Implementation

[0030] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] Reference Figure 1 , Figure 2 and Figure 3This utility model provides a pile-slab bridge suitable for underpassing railway bridges, including a pile slab 100, pile foundations 300, and a support cage 200. The pile slab 100 has a first direction, a second direction, and a third direction that are mutually perpendicular, wherein the third direction is the vertical direction of the pile slab 100, the first direction is the length direction of the pile slab 100, and the pile slab 100 is provided with a connecting hole 110, with a top reinforcement mesh 120 at the upper end of the connecting hole 110. The lower end of the pile foundation 300 is embedded in the foundation, and the upper end of the pile foundation 300 is located in the connecting hole 110 and below the top reinforcement mesh 120. The support cage 200 is disposed in the connecting hole 110 and includes connecting bars 210, diagonal bars 220, ring bars 230, and stirrups 240.

[0035] Reference Figure 2 and Figure 3 In some embodiments of this utility model, the connecting bar 210 includes a first segment 211, a second segment 212, and a third segment 213 connected in sequence. The first segment 211 and the second segment 212 extend in a third direction, respectively. The first segment 211 extends into the pile foundation 300, and the second segment 212 and the third segment 213 are located above the pile foundation 300 and within the connecting hole 110. The third segment 213 extends from the end of the second segment 212 away from the first segment 211 towards the central axis of the pile foundation 300. At least two connecting bars 210 are provided, and at least two connecting bars 210 are spaced apart around the central axis of the device. Stirrups 240 are connected to each second segment 212 to connect each second segment 212 into a whole. The number of diagonal bars 220 is the same as the number of connecting bars 210. Each diagonal bar 220 is connected to each connecting bar 210. Since the third segment 213 extends towards the central axis of the pile foundation 300, and the two ends of the diagonal bars 220 are respectively connected to the second segment 212 and the third segment 213, the diagonal bars 220, the second segment 212, and the third segment 213 form a triangular structure. Because the stirrups 240 connect at least two second segments 212 into one unit, and each connecting bar 210 is connected to the diagonal bars 220 to form a triangular structure, the supporting cage 200 forms a self-stabilizing structure, improving the structural strength and stability of the supporting cage 200 itself.

[0036] Understandably, referring to Figure 2 and Figure 3The ring reinforcement 230 is located above the third segment 213 and is connected to each third segment 213. The ring reinforcement 230 and at least two third segments 213 form a support net. The support net of the connecting hole 110 abuts against the bottom of the top reinforcement net 120 so that the support cage 200 supports the pile slab 100. The self-stabilizing structure of the support cage 200 improves the reliability of the support cage 200, thereby improving the reliability of the support cage 200 in supporting the pile slab 100. The load of the pile slab 100 is directly transferred to the support net of the support cage 200 through the top reinforcement net 120, and then to the pile foundation 300 through the support cage 200. That is, the load of the pile slab 100 is only transferred to the pile foundation 300, and then to the foundation through the pile foundation 300. During the construction of the pile slab bridge, there is no need to set up additional devices on the foundation to support the pile slab 100, reducing the additional load on the foundation during the construction process, reducing the impact on the railway bridge structure, and thus reducing the risk of accidents caused by the railway bridge.

[0037] Reference Figure 5 In some embodiments of this utility model, it is understood that at least two ring bars 230 are provided, each ring bar 230 has a different diameter, each ring bar 230 is a concentric ring with each other, and each ring bar 230 is connected to each third segment 213, which improves the structural strength of the support net and thus improves the load-bearing capacity of the support cage 200.

[0038] It is understood that in some embodiments of this utility model, when pouring the pile foundation 300, a pre-set hole for pouring the pile foundation 300 is first excavated in the foundation. The support cage 200 is placed in the pre-set hole, and the lower end of the first section 211 of the connecting bar 210 abuts against the bottom surface of the pre-set hole. Concrete is poured into the pre-set hole to form the pile foundation 300. The first section 211 of the connecting bar 210 extends into the pile foundation 300, and the second section 212 and the third section 213 of the connecting bar 210 are exposed above the pile foundation 300. When the support cage 200 is placed in the pre-set hole, since the stirrup 240 connects at least two second sections 212 into one piece, and each connecting bar 210 is connected to the diagonal bar 220 to form a triangular structure, the support cage 200 forms a self-stabilizing structure. There is no need to set up additional devices on the foundation to stabilize the support cage 200, which reduces the additional load on the foundation during the construction of the pile foundation 300 and reduces the impact on the existing railway bridge structure.

[0039] It is understandable that the support cage 200 is located inside the connecting hole 110, and after the support mesh abuts against the top reinforcement mesh 120, concrete is poured into the connecting hole 110 to connect the pile slab 100 and the pile foundation 300 to form a pile slab bridge.

[0040] It is understood that in some embodiments of this utility model, the pile foundation 300 is constructed on the foundation using rotary drilling and grouting piles, avoiding the use of soil displacement for precast pipe piles, thereby avoiding problems such as lateral extrusion and bulging of the foundation soil and reducing the threat to the railway bridge structure.

[0041] Reference Figure 1 In some embodiments of this utility model, it is understood that the pile slab 100 is provided with at least two connecting holes 110, the at least two connecting holes 110 are spaced apart along the first direction, the pile foundation 300 is provided with at least two piles, and the pile foundation 300 corresponds one-to-one with the connecting hole 110. The specific number of pile foundations 300 and connecting holes 110 is selected according to the actual construction of the pile slab bridge, and this application does not limit it here.

[0042] Reference Figure 3 In some embodiments of this utility model, it can be understood that one end of the inclined rib 220 is located at the end of the third segment 213 away from the second segment 212, and the other end of the inclined rib 220 is located at the end of the second segment 212 close to the first segment 211, so that the second segment 212, the third segment 213 and the inclined rib 220 are connected in sequence to form a triangular structure, which optimizes the stress distribution between the second segment 212, the third segment 213 and the inclined rib 220, and improves the stability and structural stiffness of the triangular structure.

[0043] Reference Figure 3 In some embodiments of this utility model, it is understood that the two ends of the inclined rib 220 respectively have a first bend 221 and a second bend 222. The first bend 221 extends along a third direction and connects to the second segment 212, increasing the area of ​​the connection between the inclined rib 220 and the second segment 212, thereby improving the connection strength between the inclined rib 220 and the second segment 212, and thus improving the structural strength of the triangular structure. The second bend 222 is located below the third segment 213. The second bend 222 extends from the end of the inclined rib 220 in a direction away from the central axis of the pile foundation 300, and the second bend 222 connects to the third segment 213, increasing the area of ​​the connection between the inclined rib 220 and the third segment 213, thereby improving the connection strength between the inclined rib 220 and the third segment 213, and thus improving the structural strength of the triangular structure.

[0044] It is understood that in some embodiments of this utility model, the two ends of the inclined rib 220 can be welded to the second segment 212 and the third segment 213 respectively. Since the inclined rib 220 has a first bend 221 connecting to the second segment 212, the welding area between the inclined rib 220 and the second segment 212 is increased, thus improving the connection strength between the inclined rib 220 and the second segment 212. Similarly, since the inclined rib 220 has a second bend 222 connecting to the third segment 213, the welding area between the inclined rib 220 and the third segment 213 is increased, further improving the connection strength between the inclined rib 220 and the third segment 213.

[0045] Reference Figure 3 and Figure 4 In some embodiments of this utility model, stirrups 240 surround the outer periphery of at least two second segments 212, and stirrups 240 are connected to each second segment 212 to connect at least two second segments 212 into a whole. At least two stirrups 240 are provided, and the at least two stirrups 240 are spaced apart along a third direction to form a columnar structure, which improves the structural strength of the supporting cage 200, improves the load-bearing capacity of the supporting cage 200, and thus enhances the self-stability of the supporting cage 200.

[0046] Reference Figure 5 In some embodiments of this utility model, the top reinforcement mesh 120 includes at least two top horizontal reinforcement bars 121 and at least two top vertical reinforcement bars 122. The top vertical reinforcement bars 122 extend along a first direction, and the at least two top vertical reinforcement bars 122 are spaced apart along a second direction. The top horizontal reinforcement bars 121 extend along the second direction, and the at least two top horizontal reinforcement bars 121 are spaced apart along the first direction. That is, the top vertical reinforcement bars 122 and the top horizontal reinforcement bars 121 are staggered, and each top horizontal reinforcement bar 121 and top vertical reinforcement bar 122 is provided with at least two bars, ensuring the structural strength of the top reinforcement mesh 120, thereby improving the stability of the top reinforcement mesh 120 against the supporting surface.

[0047] It is understandable that the pile slab 100 is a precast slab. When the pile slab 100 is cast, the connection hole 110 is reserved and the top reinforcement mesh 120 is exposed. The ends of the top horizontal reinforcement 121 and the top longitudinal reinforcement 122 extend into the side wall of the connection hole 110.

[0048] Reference Figure 4 and Figure 6 In some embodiments of this utility model, at least two sets of bottom horizontal reinforcement groups 130 and bottom longitudinal reinforcement groups 140 are provided at the end of the connecting hole 110 away from the top reinforcement mesh 120. The bottom longitudinal reinforcement groups 140 extend along a first direction, and at least two sets of bottom longitudinal reinforcement groups 140 are spaced apart along a second direction. The bottom horizontal reinforcement groups 130 extend along the second direction, and at least two sets of bottom horizontal reinforcement groups 130 are spaced apart along the first direction. That is, the bottom horizontal reinforcement groups 130 and bottom longitudinal reinforcement groups 140 are staggered, and each of the bottom horizontal reinforcement groups 130 and bottom longitudinal reinforcement groups 140 is provided with at least two sets, which improves the constraint on the concrete in the connecting hole 110, thereby improving the connection strength between the pile foundation 300 and the pile plate 100.

[0049] Reference Figure 4 and Figure 6In some embodiments of this utility model, the bottom horizontal reinforcement group 130 includes spliced ​​horizontal reinforcement and two prefabricated horizontal reinforcements 131. The two prefabricated horizontal reinforcements 131 are located at both ends of the connecting hole 110 along the second direction. One end of the prefabricated horizontal reinforcement 131 extends into the side wall of the connecting hole 110, that is, the two prefabricated horizontal reinforcements 131 extend towards each other from the side wall of the connecting hole 110 along the second direction. The two ends of the spliced ​​horizontal reinforcement are respectively connected to the two prefabricated horizontal reinforcements 131 to form the bottom horizontal reinforcement group 130. It can be understood that when casting and manufacturing the pile slab 100, one end of the prefabricated horizontal reinforcement 131 is inserted into the side wall of the connecting hole 110, and the other end is exposed in the connecting hole 110. After the supporting surface of the support cage 200 abuts against the top reinforcement mesh 120, the spliced ​​horizontal reinforcement is placed into the connecting hole 110, and the two ends of the spliced ​​horizontal reinforcement are respectively connected to the two prefabricated horizontal reinforcements 131 to complete the installation of the bottom horizontal reinforcement group 130.

[0050] Understandably, there can be two or more splicing horizontal bars. To avoid the difficulty of inserting the splicing horizontal bars into the connecting holes 110 due to the support cage 200, the splicing horizontal bars are split into two or more bars, inserted into the connecting holes 110, and then connected into one piece by welding or other means. The two ends of the splicing horizontal bars are then connected to the precast horizontal bars 131, reducing the installation difficulty of the bottom horizontal bar group 130.

[0051] Reference Figure 4 and Figure 6 In some embodiments of this utility model, the bottom longitudinal reinforcement group 140 includes splicing longitudinal reinforcement 141 and two prefabricated longitudinal reinforcements 142. The two prefabricated longitudinal reinforcements 142 are located at both ends of the connecting hole 110 along the first direction. One end of the prefabricated longitudinal reinforcement 142 extends into the side wall of the connecting hole 110, that is, the two prefabricated longitudinal reinforcements 142 extend towards each other from the side wall of the connecting hole 110 along the first direction. The two ends of the splicing longitudinal reinforcement 141 are respectively connected to the two prefabricated longitudinal reinforcements 142 to form the bottom longitudinal reinforcement group 140. Understandably, when casting the pile slab 100, one end of the precast longitudinal reinforcement 142 is inserted into the side wall of the connecting hole 110, and the other end is exposed in the connecting hole 110. After the supporting surface of the support cage 200 abuts against the top reinforcement mesh 120, the spliced ​​longitudinal reinforcement 141 is placed into the connecting hole 110, and the two ends of the spliced ​​longitudinal reinforcement 141 are respectively connected to the two precast longitudinal reinforcement 142 to complete the installation of the bottom longitudinal reinforcement group 140.

[0052] Understandably, there can be two or more spliced ​​longitudinal bars 141. To avoid the difficulty of inserting the spliced ​​longitudinal bars 141 into the connecting holes 110 due to the support cage 200, the spliced ​​longitudinal bars 141 are split into two or more, inserted into the connecting holes 110, and then the two or more spliced ​​longitudinal bars 141 are connected into one piece by welding or other means. Then, the two ends of the spliced ​​longitudinal bars 141 are connected to the precast longitudinal bars 142, which reduces the installation difficulty of the bottom longitudinal bar group 140.

[0053] Reference Figure 1and Figure 7 In some embodiments of this utility model, at least two sets of pile plates 100 are provided, and at least two sets of pile plates 100 are spaced apart along a second direction. A post-cast strip 400 is formed between adjacent sets of pile plates 100, and the post-cast strip 400 extends along a first direction. Since at least two sets of pile plates 100 are provided, and a post-cast strip 400 is provided between adjacent sets of pile plates 100, the risk of concrete shrinkage deformation and cracking caused by excessive length of the pile plate bridge along the second direction is reduced, and the influence of concrete shrinkage and temperature deformation is reduced. It is understood that the length of the post-cast strip 400 along the second direction can be adjusted according to the actual length of the pile plate bridge to improve the flexibility during construction.

[0054] Reference Figure 7 In some embodiments of this utility model, the post-cast strip 400 is provided with a post-cast reinforcement mesh 500. The post-cast strip 400 has post-cast reinforcement meshes 500 at both ends along a third direction, which improves the constraint on the concrete within the post-cast strip 400, thereby increasing the connection strength between adjacent sets of pile plates 100. The post-cast reinforcement mesh 500 includes at least two sets of post-cast reinforcement groups 510 and at least two sets of post-cast longitudinal reinforcement 520. The post-cast longitudinal reinforcement 520 extends along a first direction and connects to each post-cast reinforcement group 510. At least two post-cast longitudinal reinforcement 520s are spaced apart along a second direction. The post-cast reinforcement group 510 includes splicing reinforcement 512 and two precast reinforcement 511. The two precast reinforcement 511 are located at both ends of the post-cast strip 400 along the second direction, and one end of the precast reinforcement 511 extends into the pile plate 100. Understandably, when the pile slab 100 is poured, one end of the precast reinforcement 511 extends into the side wall of the pile slab 100 along the second direction, and the other end protrudes outside the pile slab 100. The precast reinforcement 511 of two adjacent pile slabs 100 correspond one-to-one. When the support reinforcement cages 200 of each pile foundation 300 abut against the top reinforcement mesh 120 one-to-one, the splice reinforcement 512 is placed in the post-pouring strip 400, and the two ends of the splice reinforcement 512 are respectively connected to the two precast reinforcement 511s corresponding to the two adjacent pile slabs 100 to complete the installation of the post-pouring reinforcement group 510. Then, the post-pouring longitudinal reinforcement 520 is placed in the post-pouring strip 400 and connected to the post-pouring reinforcement group 510.

[0055] Reference Figure 6 and Figure 7 In some embodiments of this utility model, at least two sets of beams 150 are provided in the connecting hole 110. The beams 150 extend in a third direction. One end of the beams 150 is connected to the top reinforcement mesh 120, and the other end is connected to the bottom horizontal reinforcement group 130 or the bottom longitudinal reinforcement group 140. This improves the constraint on the concrete in the connecting hole 110, thereby improving the connection strength between the pile foundation 300 and the pile plate 100.

[0056] Reference Figure 6 and Figure 7In some embodiments of this utility model, at least two sets of beams and plates 150 are provided in the post-cast strip 400. The beams and plates 150 extend along a third direction, and the two ends of the beams and plates 150 are respectively connected to two sets of post-cast reinforcement meshes 500, which improves the constraint on the concrete in the post-cast strip 400 and thus improves the connection strength between adjacent pile plates 100.

[0057] It is understood that the construction process of a pile-slab bridge applicable to railway underpasses in this application is as follows:

[0058] Step 1: Precast pile slab 100 is poured in advance, and connection holes 110 are reserved on the pile slab 100. The top reinforcement mesh 120, precast horizontal reinforcement 131 and precast longitudinal reinforcement 142 are reserved in the connection holes 110, as well as the precast reinforcement 511 for the post-pouring strip 400, and the support reinforcement cage 200 is made in advance.

[0059] Step 2: A pre-drilled hole for the pile foundation 300 is excavated in the foundation using rotary drilling. The support cage 200 is placed inside the pre-drilled hole, with the bottom end of the first section 211 extending into the hole and resting on its bottom surface. Since the support cage 200 has a self-stabilizing structure, no additional devices are needed on the foundation to stabilize it. Concrete is poured into the pre-drilled hole to form the pile foundation 300. The first section 211 extends into the pile foundation 300, while the second section 212 and the third section 213 are located above the pile foundation 300.

[0060] Step 3: The pile plate 100 is installed above the pile foundation 300 by hoisting or jacking, with the connecting hole 110 located above the pile foundation 300 and the support cage 200 located inside the connecting hole 110. The lower pile plate 100 is positioned so that the top reinforcement mesh 120 of the connecting hole 110 abuts against the support surface of the support cage 200, allowing the support cage 200 above the pile foundation 300 to support the pile plate 100 without the need for additional devices on the foundation to support the pile plate 100.

[0061] Step 4: Insert the spliced ​​horizontal reinforcement bars into the connection hole 110, and connect both ends of the spliced ​​horizontal reinforcement bars to the two precast horizontal reinforcement bars 131 to complete the installation of the bottom horizontal reinforcement bar group 130. Insert the spliced ​​longitudinal reinforcement bars 141 into the connection hole 110, and connect both ends of the spliced ​​longitudinal reinforcement bars 141 to the two precast longitudinal reinforcement bars 142 to complete the installation of the bottom longitudinal reinforcement bar group 140. Insert the beam slab 150 into the connection hole 110, and connect one end of the beam slab 150 to the top reinforcement mesh 120, and the other end to the bottom horizontal reinforcement bar group 130 or the bottom longitudinal reinforcement bar group 140 to complete the installation of the beam slab 150 in the connection hole 110.

[0062] Step 5: Pour concrete into the connecting hole 110 to complete the connection between the pile foundation 300 and the pile plate 100.

[0063] Step 6: Place the splice bar 512 into the post-cast strip 400, and connect both ends of the splice bar 512 to the two precast bars 511 respectively, to complete the installation of the post-cast reinforcement group 510. Place the post-cast longitudinal reinforcement 520 into the post-cast strip 400, and connect the post-cast longitudinal reinforcement 520 to the post-cast reinforcement group 510, to complete the installation of the post-cast reinforcement mesh 500. Place the beam and slab 150 into the post-cast strip 400, and connect both ends of the beam and slab 150 to the two sets of post-cast reinforcement meshes 500 respectively, to complete the installation of the beam and slab 150 within the post-cast strip 400.

[0064] Step 7: Pour concrete into the post-cast strip 400 to complete the connection of adjacent pile slabs 100, thereby completing the construction of a pile slab bridge suitable for underpass railway bridges as described in this application.

[0065] In summary, this application proposes a pile-slab bridge suitable for underpassing railway bridges. Because each diagonal bar 220 connects with each connecting bar 210 to form a triangular structure, and the stirrups 240 connect the second segment 212 of each connecting bar 210 into a single unit, the supporting cage 200 forms a self-stabilizing structure. This improves the structural strength and stability of the supporting cage 200 itself. Consequently, during the pouring of the pile foundation 300 in step 2, no additional devices are needed on the foundation to stabilize the supporting cage 200, reducing the additional load on the foundation during construction and minimizing the impact on the existing railway bridge structure. Since the supporting surface of the supporting cage 200 abuts against the top reinforcement mesh 120 of the pile slab 100, i.e., the supporting cage 200 supports the pile slab 100, the self-stabilizing structure of the supporting cage 200 improves its reliability, thereby enhancing the reliability of the supporting cage 200 in supporting the pile slab 100. The load of the pile sheet 100 is transferred to the pile foundation 300 through the support cage 200, and then to the foundation through the pile foundation 300. During the construction of the pile sheet bridge, there is no need to set up additional devices on the foundation to support the pile sheet 100, which reduces the additional load on the foundation during the construction process and reduces the impact on the railway bridge structure.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pile-slab bridge suitable for use under railway bridges, characterized in that, include: The pile plate has a first direction, a second direction and a third direction that are perpendicular to each other, the third direction being the vertical direction, and the pile plate is provided with connecting holes, and the upper end of the connecting holes is provided with a top reinforcement mesh; The pile foundation has its upper end fixed in the connecting hole and located below the top reinforcement mesh, and its lower end is used to be buried in the foundation. A support cage is disposed in the connecting hole. The support cage includes connecting bars, diagonal bars, ring bars and stirrups. The connecting bars include a first section, a second section and a third section connected in sequence. The first segment and the second segment extend along the third direction, with the first segment extending into the pile foundation. The second segment and the third segment are located above the pile foundation, and the third segment extends towards the central axis of the pile foundation. At least two connecting bars are provided, and the at least two connecting bars are spaced apart around the central axis of the pile foundation. The stirrups are connected to each of the second segments. The number of diagonal bars is the same as the number of connecting bars. Each diagonal bar is connected to each connecting bar one by one. The two ends of each diagonal bar are respectively connected to the second segment and the third segment, forming a triangular structure so that the support cage forms a self-stabilizing structure. The ring reinforcement is located above the third segment and is connected to each of the third segments. At least two of the third segments and the ring reinforcement form a support net, which abuts against the bottom of the top reinforcement net.

2. A pile-slab bridge suitable for underpassing railway bridges according to claim 1, characterized in that: One end of the diagonal rib is located at the end of the third segment away from the second segment, and the other end of the diagonal rib is located at the end of the second segment close to the first segment. The second segment, the third segment, and the diagonal rib together form the triangular structure.

3. A pile-slab bridge suitable for underpassing railway bridges according to claim 2, characterized in that: The inclined rib has a first bend and a second bend at both ends. The first bend extends along the third direction and is connected to the second segment. The second bend is located below the third segment and is connected to the third segment.

4. A pile-slab bridge suitable for underpassing railway bridges according to claim 1, characterized in that: The stirrups enclose the outer periphery of at least two of the second segments and are connected to each of the second segments. There are at least two stirrups, which are spaced apart along the third direction to form a columnar structure.

5. A pile-slab bridge suitable for underpassing railway bridges according to claim 1, characterized in that: The top reinforcement mesh includes at least two top horizontal reinforcements and at least two top vertical reinforcements. The top vertical reinforcements extend along the first direction, and at least two top vertical reinforcements are spaced apart along the second direction. The top horizontal reinforcements extend along the second direction, and at least two top horizontal reinforcements are spaced apart along the first direction. The top horizontal reinforcements are located above the top vertical reinforcements.

6. A pile-slab bridge suitable for underpassing railway bridges according to claim 1, characterized in that: At least two sets of bottom horizontal ribs and at least two sets of bottom longitudinal ribs are provided at the end of the connecting hole away from the top rib mesh. The bottom longitudinal ribs extend along the first direction, and at least two sets of bottom longitudinal ribs are spaced apart along the second direction. The bottom horizontal ribs extend along the second direction, and at least two sets of bottom horizontal ribs are spaced apart along the first direction.

7. A pile-slab bridge suitable for underpassing railway bridges according to claim 6, characterized in that: The bottom horizontal reinforcement group includes a spliced ​​horizontal reinforcement and two prefabricated horizontal reinforcements. The two prefabricated horizontal reinforcements are located at both ends of the connecting hole along the second direction, and the two ends of the spliced ​​horizontal reinforcement are respectively connected to the two prefabricated horizontal reinforcements.

8. A pile-slab bridge suitable for underpassing railway bridges according to claim 6, characterized in that: The bottom longitudinal reinforcement group includes spliced ​​longitudinal reinforcement and two precast longitudinal reinforcements. The two precast longitudinal reinforcements are located at both ends of the connecting hole along the first direction, and the two ends of the spliced ​​longitudinal reinforcement are respectively connected to the two precast longitudinal reinforcements.

9. A pile-slab bridge suitable for underpassing railway bridges according to claim 1, characterized in that: The pile plate is provided in at least two sets, and the at least two sets of pile plates are spaced apart along the second direction. A post-cast strip is formed between two adjacent sets of pile plates, and the post-cast strip extends along the third direction.

10. A pile-slab bridge suitable for underpassing railway bridges according to claim 9, characterized in that: The post-cast strip is provided with a post-cast reinforcement mesh, and both ends of the post-cast strip along the third direction are provided with post-cast reinforcement mesh. The post-cast reinforcement mesh includes at least two sets of post-cast reinforcement groups and at least two post-cast longitudinal reinforcements. The post-cast longitudinal reinforcements extend along the first direction, and at least two post-cast longitudinal reinforcements are spaced apart along the second direction. The post-cast reinforcement groups extend along the second direction, and at least two post-cast reinforcement groups are spaced apart along the first direction.

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