A U-shaped prestressed open underground passage structure for urban roads

Abstract

The present invention belongs to the technical field of urban municipal road engineering, and particularly relates to a U-shaped prestressed open underground passage structure for urban roads, comprising a bottom plate mechanism, two groups of reinforcement mechanisms and two groups of crossbeam mechanisms; the two groups of reinforcement mechanisms are fixedly connected to the two ends of the bottom plate mechanism, the two groups of crossbeam mechanisms are fixedly connected to the bottom of the bottom plate mechanism, and the two groups of crossbeam mechanisms are symmetrically arranged with the central axis of the bottom plate mechanism as the center; the two groups of reinforcement mechanisms are distributed at the ends of the bottom plate mechanism, compared with the traditional large plate structure composed purely of vertical plates and horizontal plates, the cross section of the plate is reduced, and the reinforcement mechanism is used to increase the anti-floating effect of the overall structure, the combined use of the bottom plate mechanism and the reinforcement mechanism meets the requirements of post-tensioning prestressed construction, and the construction method is more flexible.

Description

Technical Field

[0001] The invention belongs to the technical field of urban municipal road engineering, and in particular relates to a U-shaped prestressed open underground passage structure for an urban road. Background Art

[0002] Subways and surrounding buildings are often not built together. Most of the existing underground buildings are often not built with connection to the subway in mind. When building subway stations, in order to establish underground connections with surrounding buildings, they often need to be connected to the surrounding underground buildings through underground passages.

[0003] After searching, in the prior art, Chinese patent publication number CN209636858U, publication date: 2019-11-15, discloses a short underground passage structure connecting a new basement with an existing subway station. The structure includes a number of horizontal beams and two ring beams. The horizontal beams extend along the excavation direction of the underground passage and are evenly distributed on the upper side and left and right sides of the excavation section. The ring beams are located on the sections at both ends of the horizontal beams. This utility model solves the problem of connecting a new basement with an existing subway station. The construction method belongs to the dark excavation method, which avoids a series of problems such as traffic jams, huge earthwork volume and high noise that may be caused by open excavation construction, provides a more secure working surface for engineering construction, and effectively enhances the stability of the tunnel.

[0004] However, the equipment still has the following defects: although it can provide a more secure working surface for engineering construction and effectively enhance the stability of the tunnel, when the urban road extends from the ground to the underground tunnel, there is usually a U-shaped open road passage. The side panels of the open U-shaped passage cantilever resist the soil pressure on the side. When the U-shaped passage mouth is deeper, the soil pressure on the side wall is larger, resulting in a larger bending moment at the bottom of the side panel, larger structural dimensions and reinforcement, and even conventional reinforced concrete structures cannot meet the requirements. At the same time, the bottom plate has large buoyancy and additional anti-floating measures are required. Summary of the invention

[0005] In view of the above problems, the present invention provides a U-shaped prestressed open underground passage structure for an urban road, comprising a bottom plate mechanism, two sets of reinforcement mechanisms and two sets of cross beam mechanisms; the two sets of reinforcement mechanisms are fixedly connected to both ends of the bottom plate mechanism, the two sets of cross beam mechanisms are fixedly connected to the bottom of the bottom plate mechanism, and the two sets of cross beam mechanisms are symmetrically arranged with the central axis of the bottom plate mechanism as the center;

[0006] By distributing the reinforcement mechanism at the end of the bottom plate mechanism, the cross-section of the plate is reduced compared to the traditional large plate structure consisting purely of vertical and horizontal plates, and the reinforcement mechanism is used to increase the anti-floating effect of the overall structure. The combination of the bottom plate mechanism and the reinforcement mechanism meets the requirements of post-tensioned prestressed construction, and the construction method is more flexible.

[0007] Furthermore, the bottom plate mechanism includes a bottom plate; the bottom plate is a rectangular structure, and both ends of the bottom of the bottom plate are provided with embedded cavities, the top of the bottom plate and positions close to the ends are provided with embedded grooves, and the embedded grooves are connected to the embedded cavities.

[0008] Furthermore, the reinforcement mechanism includes two groups of buttress vertical beams; one side wall of the two groups of buttress vertical beams is fixedly connected with a side plate, and the bottom of the two groups of buttress vertical beams is fixedly connected with a heel plate, the connection between the side plate and the heel plate is set at a right angle, and the end of the heel plate and the side plate close to the right angle is fixedly connected with a reinforcement plate, the end of the reinforcement plate is set at a right angle, and the reinforcement plate is embedded and installed in the embedded cavity and the embedded groove.

[0009] Furthermore, the buttress vertical beam is a right-angled trapezoidal structure, and the top and bottom of the buttress vertical beam are provided with first stress holes that penetrate each other, and prestressed beam steel bars are arranged in the first stress hole, and a first through hole that penetrates each other with the first stress hole is opened on one side wall of the buttress vertical beam.

[0010] Furthermore, two groups of second through holes are formed on one side wall of the side plate, and the two groups of second through holes are symmetrically arranged with the central axis of the side plate as the center, and a plurality of groups of third through holes are formed on the bottom of the side plate.

[0011] Furthermore, a first perfusion cavity is opened on the inner wall of the side panel, and the first perfusion cavity, two groups of second through holes and the third through hole are interconnected, the outer wall of the side panel and one side close to the second through hole is fixedly connected to the buttress vertical beam, and the second through hole is interconnected with the first through hole.

[0012] Furthermore, two groups of fourth through holes are opened on the top of the heel plate, and the two groups of fourth through holes are symmetrically arranged with the central axis of the heel plate as the center, a plurality of groups of fifth through holes are opened on one side wall of the heel plate, and a second perfusion cavity is opened on the inner wall of the heel plate.

[0013] Furthermore, two groups of sixth through holes are provided at the bottom of the heel plate, and the two groups of sixth through holes are symmetrically arranged with the central axis of the heel plate as the center, the fourth through hole, the fifth through hole, the second perfusion cavity and the sixth through hole are interconnected, the outer wall of the heel plate and the side close to the fourth through hole are fixedly connected to the buttress vertical beam, and the fourth through hole is interconnected with the first stress hole.

[0014] Furthermore, the crossbeam mechanism includes a bottom plate crossbeam; second stress holes that are interconnected are opened at both ends of the bottom plate crossbeam, and prestressed beam steel bars are arranged in the second stress holes.

[0015] Furthermore, two groups of seventh through holes are provided at the top of the bottom plate cross beam, and one end of the two groups of the seventh through holes are interconnected with the second stress hole, the outer wall of the bottom plate cross beam and one side close to the seventh through hole are fixedly connected to the heel plate, and the seventh through hole is interconnected with the sixth through hole.

[0016] The beneficial effects of the present invention are:

[0017] 1. Two sets of reinforcement mechanisms are distributed at the ends of the bottom plate mechanism. Compared with the traditional large plate structure composed purely of vertical plates and horizontal plates, the cross-section of the plate is reduced, and the reinforcement mechanism is used to increase the anti-floating effect of the overall structure. The combination of the bottom plate mechanism and the reinforcement mechanism meets the requirements of post-tensioning prestressed construction, and the construction method is more flexible.

[0018] 2. A reinforcement mechanism is formed by combining buttress beams, side plates and heel plates. The buttress beams are used to strengthen the connection strength between the side plates and the heel plates. The soil is covered on the heel plates to increase the anti-floating effect of the overall structure. The reinforcement plates at the connection between the side plates and the heel plates are used. When the reinforcement plates are embedded and installed in the embedded cavities and embedded grooves, the stability of the connection between the reinforcement mechanism and the bottom plate mechanism can be improved.

[0019] 3. Prestressed beam steel bars are arranged in the first stress hole and prestressed beam steel bars are arranged in the second stress hole, which can increase the force-bearing performance of the buttress vertical beam and the bottom plate cross beam, meet the requirements of a higher depth of U-shaped structure, and solve the problem of bending and shearing resistance of the side wall with large soil pressure. At the same time, the structure also has the characteristics of a buttress retaining wall, and the soil covering the upper part of the heel plate can play an anti-floating role and solve the anti-floating problem.

[0020] 4. After the prestressed beam steel bars are arranged in the first stress hole and the second stress hole, during the grouting process in the hole, cement first enters from the first stress hole and is diverted through the first through hole through the second through hole and the first pouring cavity, and then the cement is distributed at different positions on the top surface of the bottom plate end through several groups of third through holes at the bottom of the first pouring cavity, thereby increasing the strength of the connection between the side plate and the bottom plate.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The structure diagram of the underground passage structure according to the embodiment of the present invention is shown. Figure 1 ;

[0024] Figure 2 The structure diagram of the underground passage structure according to the embodiment of the present invention is shown. Figure 2 ;

[0025] Figure 3 The structure of the bottom plate mechanism of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 4 The structure of the bottom plate mechanism of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 5 A schematic diagram of the structure of a reinforcement mechanism according to an embodiment of the present invention is shown;

[0028] Figure 6 A schematic diagram of the structure of a buttress vertical beam according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of the structure of a side plate according to an embodiment of the present invention is shown;

[0030] Figure 8 A schematic diagram of the structure of a heel plate according to an embodiment of the present invention is shown;

[0031] Fig. 9 A schematic structural diagram of a crossbeam mechanism according to an embodiment of the present invention is shown.

[0032] In the figure: 1. bottom plate mechanism; 11. bottom plate; 12. embedded cavity; 13. embedded groove; 2. reinforcement mechanism; 21. buttress vertical beam; 22. side plate; 23. heel plate; 24. reinforcement plate; 25. first stress hole; 26. first through hole; 27. second through hole; 28. third through hole; 29. ​​first perfusion cavity; 210. fourth through hole; 211. fifth through hole; 212. second perfusion cavity; 213. sixth through hole; 3. crossbeam mechanism; 31. bottom plate crossbeam; 32. second stress hole; 33. seventh through hole. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The embodiment of the present invention provides a U-shaped prestressed open underground passage structure for an urban road, comprising a bottom plate mechanism 1, two sets of reinforcement mechanisms 2 and two sets of crossbeam mechanisms 3; for example, Figure 1 and Figure 2 shown.

[0035] The two groups of reinforcement mechanisms 2 are both fixedly connected to the two ends of the base plate mechanism 1 , the two groups of crossbeam mechanisms 3 are both fixedly connected to the bottom of the base plate mechanism 1 , and the two groups of crossbeam mechanisms 3 are symmetrically arranged with the central axis of the base plate mechanism 1 as the center.

[0036] Specifically, the two groups of reinforcement mechanisms 2 are distributed at the ends of the base plate mechanism 1. Compared with the traditional large plate structure consisting purely of vertical and horizontal plates, the cross-section of the plate is reduced, and the reinforcement mechanism 2 is used to increase the anti-floating effect of the overall structure. The combined use of the base plate mechanism 1 and the reinforcement mechanism 2 meets the requirements of post-tensioning prestressed construction, and the construction method is more flexible.

[0037] The base plate mechanism 1 includes a base plate 11; illustratively, as Figure 3 and Figure 4 shown.

[0038] The bottom plate 11 is a rectangular structure, and both ends of the bottom of the bottom plate 11 are provided with embedded cavities 12 , and the top of the bottom plate 11 and positions close to the ends are provided with embedded grooves 13 , and the embedded grooves 13 are connected to the embedded cavities 12 .

[0039] The reinforcement mechanism 2 includes two sets of buttress vertical beams 21; for example, Figure 5 shown.

[0040] One side wall of the two groups of buttress vertical beams 21 is fixedly connected with a side plate 22, and the bottom of the two groups of buttress vertical beams 21 is fixedly connected with a heel plate 23, the connection between the side plate 22 and the heel plate 23 is set at a right angle, and the end of the heel plate 23 and the side plate 22 close to the right angle is fixedly connected with a reinforcing plate 24, the end of the reinforcing plate 24 is set at a right angle, and the reinforcing plate 24 is embedded and installed in the embedded cavity 12 and the embedded groove 13.

[0041] The buttress beam 21 is a right-angled trapezoidal structure, and the top and bottom of the buttress beam 21 are provided with first stress holes 25 that interpenetrate each other, and prestressed beam steel bars are arranged in the first stress holes 25, and one side wall of the buttress beam 21 is provided with a first through hole 26 that interpenetrates with the first stress hole 25; for example, Figure 6 shown.

[0042] Two groups of second through holes 27 are opened on one side wall of the side plate 22, and the two groups of second through holes 27 are symmetrically arranged with the central axis of the side plate 22 as the center, and a plurality of groups of third through holes 28 are opened on the bottom of the side plate 22, and a first perfusion cavity 29 is opened on the inner wall of the side plate 22, and the first perfusion cavity 29, the two groups of second through holes 27 and the third through holes 28 are interconnected, and the outer wall of the side plate 22 and the side close to the second through holes 27 are fixedly connected to the buttress vertical beam 21, and the second through holes 27 are interconnected with the first through holes 26; for example, Figure 7 shown.

[0043] Two groups of fourth through holes 210 are provided on the top of the heel plate 23, and the two groups of the fourth through holes 210 are symmetrically arranged with the central axis of the heel plate 23 as the center, a plurality of groups of fifth through holes 211 are provided on one side wall of the heel plate 23, a second perfusion cavity 212 is provided on the inner wall of the heel plate 23, two groups of sixth through holes 213 are provided on the bottom of the heel plate 23, and the two groups of the sixth through holes 213 are symmetrically arranged with the central axis of the heel plate 23 as the center, the fourth through hole 210, the fifth through hole 211, the second perfusion cavity 212 and the sixth through hole 213 are all interconnected, the outer wall of the heel plate 23 and the side close to the fourth through hole 210 are fixedly connected to the buttress vertical beam 21, and the fourth through hole 210 is interconnected with the first stress hole 25; for example, Figure 8 shown.

[0044] The crossbeam mechanism 3 includes a bottom crossbeam 31; illustratively, as Fig. 9 shown.

[0045] The two ends of the bottom plate cross beam 31 are provided with second stress holes 32 that are interconnected, and prestressed beam steel bars are arranged in the second stress holes 32. The top of the bottom plate cross beam 31 is provided with two groups of seventh through holes 33, and one ends of the two groups of the seventh through holes 33 are interconnected with the second stress holes 32. The outer wall of the bottom plate cross beam 31 and the side close to the seventh through hole 33 are fixedly connected to the heel plate 23, and the seventh through hole 33 is interconnected with the sixth through hole 213.

[0046] Specifically, the buttress beam 21, the side plate 22 and the heel plate 23 are combined to form the reinforcement mechanism 2. The buttress beam 21 is used to strengthen the connection strength between the side plate 22 and the heel plate 23. The heel plate 23 is covered with soil, which can increase the anti-floating effect of the overall structure. The reinforcement plate 24 at the connection between the side plate 22 and the heel plate 23 is used. When the reinforcement plate 24 is embedded and installed in the embedded cavity 12 and the embedded groove 13, the stability of the connection between the reinforcement mechanism 2 and the bottom plate mechanism 1 can be improved.

[0047] Prestressed beam steel bars are arranged in the first stress hole 25, and prestressed beam steel bars are arranged in the second stress hole 32, which can increase the force-bearing performance of the buttress vertical beam 21 and the bottom plate cross beam 31, meet the requirements of U-shaped structures with higher depths, and solve the problem of bending and shear resistance due to large soil pressure on the side walls. At the same time, the structure also has the characteristics of a buttress retaining wall, and the soil covering the upper part of the heel plate 23 can play an anti-floating role, solving the anti-floating problem.

[0048] The post-tensioning prestressed structure construction steps are:

[0049] 1. The first step is to excavate the U-shaped foundation pit;

[0050] 2. The second step is to tie the bottom plate, heel plate steel bars, bottom plate cross beams, and reserve the prestressed steel bar pipelines for the bottom plate cross beams;

[0051] 3. The third step is pouring concrete for the bottom plate and bottom plate beam;

[0052] 4. The fourth step is to install the prestressed tendons of the bottom plate beam and perform prestressing. After the prestressing is completed, grouting is performed in the hole;

[0053] 5. The fifth step is to tie the side panels and buttress beams, and install the prestressed steel pipes of the buttress beams;

[0054] 6. The sixth step is to pour the concrete of the side panels and buttress beams;

[0055] 7. The seventh step is to install the prestressed tendons of the buttress vertical beams and perform prestressing tensioning; after tensioning is completed, grouting is performed in the holes;

[0056] After the prestressed beam steel bars are arranged in the first stress hole 25 and the second stress hole 32, during the grouting process in the hole, cement first enters from the first stress hole 25 and is diverted through the first through hole 26 to pass through the second through hole 27 and the first grouting cavity 29, and then is distributed to different positions on the top surface of the end of the bottom plate 11 through a plurality of groups of third through holes 28 at the bottom of the first grouting cavity 29, thereby increasing the strength of the connection between the side plate 22 and the bottom plate 11;

[0057] During the grouting process in the hole, the cement in the first stress hole 25 also enters the second grouting cavity 212 through the fourth through hole 210, and then the cement is distributed at different positions on the side of the end of the bottom plate 11 through several groups of sixth through holes 213 on one side of the second grouting cavity 212, thereby further increasing the strength of the connection between the side plate 22 and the bottom plate 11.

[0058] The working principle of the U-shaped prestressed open underground passage structure for urban roads proposed in the embodiment of the present invention is as follows:

[0059] The reinforcement mechanism 2 is formed by combining the buttress beam 21, the side plate 22 and the heel plate 23. The buttress beam 21 is used to strengthen the connection strength between the side plate 22 and the heel plate 23. The heel plate 23 is covered with soil to increase the anti-floating effect of the overall structure. The reinforcement plate 24 at the connection between the side plate 22 and the heel plate 23 is used. When the reinforcement plate 24 is embedded and installed in the embedded cavity 12 and the embedded groove 13, the stability of the connection between the reinforcement mechanism 2 and the bottom plate mechanism 1 can be improved.

[0060] By arranging the prestressed beam steel bar in the first stress hole 25 and the prestressed beam steel bar in the second stress hole 32, the force bearing performance of the buttress vertical beam 21 and the bottom plate cross beam 31 can be increased, and the requirements of a U-shaped structure with a higher depth can be met, and the bending and shearing resistance problems of the side wall with large soil pressure can be solved. At the same time, the structure also has the characteristics of a buttress retaining wall, and the soil covering the upper part of the heel plate 23 can play an anti-floating role, solving the anti-floating problem;

[0061] After the prestressed beam steel bars are arranged in the first stress hole 25 and the second stress hole 32, during the grouting process in the hole, cement first enters from the first stress hole 25 and is diverted through the first through hole 26 to pass through the second through hole 27 and the first grouting cavity 29, and then is distributed to different positions on the top surface of the end of the bottom plate 11 through a plurality of groups of third through holes 28 at the bottom of the first grouting cavity 29, thereby increasing the strength of the connection between the side plate 22 and the bottom plate 11;

[0062] During the grouting process in the hole, the cement in the first stress hole 25 also enters the second grouting cavity 212 through the fourth through hole 210, and then the cement is distributed at different positions on the side of the end of the bottom plate 11 through several groups of sixth through holes 213 on one side of the second grouting cavity 212, thereby further increasing the strength of the connection between the side plate 22 and the bottom plate 11.

[0063] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A U-shaped prestressed open underground passage structure for an urban road, characterized in that: It comprises a base plate mechanism (1), two groups of reinforcement mechanisms (2) and two groups of cross beam mechanisms (3); the two groups of reinforcement mechanisms (2) are fixedly connected to the two ends of the base plate mechanism (1), the two groups of cross beam mechanisms (3) are fixedly connected to the bottom of the base plate mechanism (1), and the two groups of cross beam mechanisms (3) are symmetrically arranged with the central axis of the base plate mechanism (1) as the center; The reinforcement mechanism is distributed at the end of the bottom plate mechanism, which reduces the cross section of the plate compared to the traditional large plate structure consisting of vertical plates and horizontal plates, and uses the reinforcement mechanism to increase the anti-floating effect of the overall structure. The combination of the bottom plate mechanism and the reinforcement mechanism meets the requirements of post-tensioning prestressed construction, and the construction method is more flexible. The bottom plate mechanism (1) comprises a bottom plate (11); the bottom plate (11) is a rectangular structure, and both ends of the bottom of the bottom plate (11) are provided with embedded cavities (12), and the top of the bottom plate (11) and a position close to the end are provided with embedded grooves (13), and the embedded grooves (13) are communicated with the embedded cavities (12); The reinforcement mechanism (2) comprises two groups of buttress vertical beams (21); one side wall of the two groups of buttress vertical beams (21) is fixedly connected with a side plate (22), and the bottom of the two groups of buttress vertical beams (21) is fixedly connected with a heel plate (23), the connection between the side plate (22) and the heel plate (23) is arranged at a right angle, and the end of the heel plate (23) and the side plate (22) close to the right angle is fixedly connected with a reinforcement plate (24), the end of the reinforcement plate (24) is arranged at a right angle, and the reinforcement plate (24) is embedded and installed in the embedded cavity (12) and the embedded groove (13); The buttress vertical beam (21) is a right-angled trapezoidal structure, the top and bottom of the buttress vertical beam (21) are provided with first stress holes (25) that are mutually interpenetrating, and prestressed beam steel bars are arranged in the first stress holes (25), and a first through hole (26) that is mutually interpenetrating with the first stress hole (25) is provided on one side wall of the buttress vertical beam (21).

2. The urban road U-shaped prestressed open underground passage structure according to claim 1 is characterized by: Two groups of second through holes (27) are provided on one side wall of the side plate (22), and the two groups of second through holes (27) are symmetrically arranged with the central axis of the side plate (22) as the center, and a plurality of groups of third through holes (28) are provided on the bottom of the side plate (22).

3. The urban road U-shaped prestressed open underground passage structure according to claim 2 is characterized by: The inner wall of the side plate (22) is provided with a first perfusion cavity (29), and the first perfusion cavity (29), two groups of second through holes (27) and the third through hole (28) are interconnected; the outer wall of the side plate (22) and one side close to the second through hole (27) are fixedly connected to the buttress vertical beam (21), and the second through hole (27) is interconnected with the first through hole (26).

4. The urban road U-shaped prestressed open underground passage structure according to claim 1 is characterized by: Two groups of fourth through holes (210) are provided on the top of the heel plate (23), and the two groups of fourth through holes (210) are symmetrically arranged with the central axis of the heel plate (23) as the center, a plurality of groups of fifth through holes (211) are provided on one side wall of the heel plate (23), and a second perfusion cavity (212) is provided on the inner wall of the heel plate (23).

5. The urban road U-shaped prestressed open underground passage structure according to claim 4 is characterized by: Two groups of sixth through holes (213) are provided at the bottom of the heel plate (23), and the two groups of the sixth through holes (213) are symmetrically arranged with the central axis of the heel plate (23) as the center, the fourth through hole (210), the fifth through hole (211), the second perfusion cavity (212) and the sixth through hole (213) are all interconnected, the outer wall of the heel plate (23) and the side close to the fourth through hole (210) are fixedly connected to the buttress vertical beam (21), and the fourth through hole (210) is interconnected with the first stress hole (25).

6. The urban road U-shaped prestressed open underground passage structure according to claim 1, characterized in that: The crossbeam mechanism (3) comprises a bottom plate crossbeam (31); two ends of the bottom plate crossbeam (31) are provided with second stress holes (32) that are interconnected, and prestressed beam steel bars are arranged in the second stress holes (32).

7. The urban road U-shaped prestressed open underground passage structure according to claim 6, characterized in that: Two groups of seventh through holes (33) are provided on the top of the bottom plate cross beam (31), and one end of the two groups of the seventh through holes (33) are mutually communicated with the second stress hole (32); the outer wall of the bottom plate cross beam (31) and one side close to the seventh through holes (33) are fixedly connected to the heel plate (23), and the seventh through hole (33) is mutually communicated with the sixth through hole (213).

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