CN113463447A

CN113463447A - Large-span longitudinal and transverse beam structure for assisting tunnel to penetrate existing linear track

Info

Publication number: CN113463447A
Application number: CN202110852270.5A
Authority: CN
Inventors: 苏哿; 霍思逊; 朱双燕; 其他发明人请求不公开姓名
Original assignee: China Railway Design Corp
Current assignee: China Railway Design Corp
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-10-01

Abstract

The invention provides a large-span longitudinal and transverse beam structure assisting a tunnel to penetrate an existing line track downwards, which comprises reinforced concrete longitudinal beams erected below two sides of the existing line track, wherein the reinforced concrete longitudinal beams are erected on cast-in-situ bored piles, at least two cast-in-situ bored piles are respectively positioned near the outer contour of the tunnel at the junction of the underpass tunnel and the existing line track, cross beams are erected between the reinforced concrete longitudinal beams at intervals, and steel rails of the existing line track are erected on the cross beams. The invention has reasonable cost and convenient construction, is suitable for the vertical and horizontal beam structure which assists the tunnel with larger cross span to pass through the existing railway track downwards, and ensures the normal and safe operation of the existing railway track when the tunnel passes through the existing railway track downwards.

Description

Large-span longitudinal and transverse beam structure for assisting tunnel to penetrate existing linear track

Technical Field

The invention relates to the technical field of tunnel engineering, in particular to an auxiliary structure for an existing railway track passing through a tunnel, which is particularly suitable for existing railway track engineering with small clear distance between the tunnel passing through and the tunnel and large cross span.

Background

The railway tunnel construction is often influenced by geological conditions, stratum environments and ground environments, when the railway tunnel penetrates through an existing railway line, the existing railway line is busy in transportation, and the clear distance between the existing railway line and a tunnel structure below the existing railway line is small, so that the existing railway line is extremely prone to overlarge settlement during the tunnel penetration construction, and the train operation safety is influenced. Therefore, in order to reduce the settlement deformation of the existing line track and ensure the operation safety of the existing line, auxiliary measures have to be considered when the tunnel is constructed through downward penetration.

In the past engineering field, when a frame structure is penetrated through an existing line or a bridge and culvert below a railway and is expanded, D-shaped steel temporary beams or longitudinal and transverse I-shaped steel protection is often adopted. However, when the existing engineering passes through a railway line, the crossing span becomes larger and larger, and in the face of the situation, when the engineering construction is carried out, protective measures such as D-shaped steel temporary beam, longitudinal and transverse I-shaped steel and the like are generally suitable for a structure with the span not exceeding 24m in the engineering due to the larger flexibility of steel, and when the span is too large, the overlarge deflection is easily generated, so that the track is seriously settled and deformed when a train runs, the train derails and the life and property safety are influenced. In addition, the steel consumption of the two protection measures is large, the transportation is inconvenient, and the manufacturing cost is high. Therefore, a novel large-span structure capable of replacing D-shaped steel temporary beams and longitudinal and transverse I-shaped steel is needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the longitudinal and transverse beam structure which is reasonable in cost, convenient to construct and suitable for assisting the tunnel with larger cross span to pass through the existing railway line downwards, so that the problem that the existing railway line normally and safely operates when the tunnel passes through the existing railway line downwards and upwards is solved.

The invention provides the following technical scheme:

the large-span longitudinal and transverse beam structure for assisting the tunnel to penetrate the existing line track comprises reinforced concrete longitudinal beams erected below two sides of the existing line track, the reinforced concrete longitudinal beams are erected on cast-in-situ bored piles, at least two of the cast-in-situ bored piles are respectively positioned near the outer contour of the tunnel at the junction of the underground tunnel and the existing line track, cross beams are erected between the reinforced concrete longitudinal beams at intervals, and steel rails of the existing line track are erected on the cross beams.

The cast-in-situ bored pile is at least designed into six, wherein four of the six cast-in-situ bored piles are respectively positioned near the outer contours of four tunnels at the junction of a underpass tunnel and an existing line track, the other two of the four cast-in-situ bored piles which are far away from the underpass tunnel and the existing line track are respectively used as a group, and each group of connecting lines are positioned in the direction vertical to the extending direction of the existing line track; the reinforced concrete longitudinal beam is provided with at least two ends capable of crossing the junction of the underpass tunnel and the existing line track; the single-side reinforced concrete longitudinal beam is arranged at the position 3-10m away from the same side of the existing line track.

The cast-in-situ bored pile top pouring bearing platform structure is a C40 reinforced concrete bearing platform structure, main reinforcement of a cast-in-situ bored pile base is anchored into the bearing platform structure, and a reinforced concrete longitudinal beam is erected on the bearing platform structure; and a rubber plate is further arranged between the beam bottom of the reinforced concrete longitudinal beam and the bearing platform structure in a cushioning mode.

The reinforced concrete longitudinal beam is cast with a reinforced concrete leveling layer, the beam is erected on the reinforced concrete longitudinal beam through the leveling layer, the leveling layer and the reinforced concrete longitudinal beam are connected through connecting reinforcing steel bars, and the section of the leveling layer is L-shaped; and the leveling course is configured to enable the cross beam to provide stable support for the steel rail.

Further, a support steel buckle plate is arranged on the beam, and the beam is fixed on the leveling layer through a plurality of support steel buckle plates and fastening connection pairs; the welding pad between the bottom of the beam and the leveling layer is provided with a steel base plate, the bottom of the beam and the lap joint part of the leveling layer are welded with channel steel, and the steel base plate and the channel steel are respectively used for providing a pad structure when the beam is connected with other structures on the lower part.

Furthermore, the cross beams are I45b I-shaped steel, the material of the cross beams is Q235, and the cross beams are dead against each other by short wood; reinforcing rib plates are respectively arranged below the steel rails and at the positions where the two ends of the beam are connected with the leveling course erection, the reinforcing rib plates can be welded in grooves on the two sides of the I-steel, one reinforcing rib plate is arranged every 100mm, and 3-6 reinforcing rib plates are arranged at each position; the reinforcing rib plates at two ends of the cross beam are positioned in the support steel buckle plate.

The end parts of the cross beams are welded by angle steel to form longitudinal and parallel connection.

And the cross beam is also provided with a fastening rail along the existing line track, and the fastening rail is configured to be connected with the cross beam and/or the sleeper through a connecting structure.

Furthermore, a guard rail buckle plate, second connecting bolts and nuts thereof which are respectively positioned on two sides of the guard rail buckle plate are adopted to connect the buckle rail and the cross beam, and the second connecting bolts are U-shaped bolts; the fastening rail and the sleeper are firmly connected by adopting a rail protection fastening plate, second connecting bolts and nuts thereof which are respectively positioned on two sides of the rail protection fastening plate; the buckling rails are divided into two side buckling rails and a center buckling rail, the two side buckling rails are composed of three old steel rails, and the center buckling rail is composed of five old steel rails.

The steel rail fixing device comprises a steel rail, fixing clamping pieces, an insulating base plate and a beam, wherein the fixing clamping pieces are arranged on two sides of the steel rail and welded and fixed on the beam to clamp and fix the steel rail, and the insulating base plate is arranged at the joint of the bottom of the center of the steel rail and the beam in a cushioning mode.

Compared with the prior art, the invention has the advantages and positive effects that: the deformation and stress of the steel rail in train operation during tunnel construction are reduced by forming a longitudinal and transverse beam structure. This kind of auxiliary structure is applicable to tunnel and the orbital large-span cross engineering of existing line down, and the existing railway line train normal safe operation in top when can guaranteeing to wear the construction under the tunnel, and this structural longitudinal adopts reinforced concrete structure, compares in D shaped steel just roof beam and move about freely and quickly I-steel structure, in the inconvenient area of transportation, can the construction of drawing materials on the spot, compares the girder steel structure simultaneously, and reinforced concrete structure warp less, and is more safe, and reinforced concrete structure cost is lower in addition, and application prospect is extensive.

Drawings

FIG. 1 is a top plan view of a structure according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a structure according to an embodiment of the present invention;

FIG. 3 is a schematic view of the overall structure of the connecting part of the cross beam and the leveling layer;

FIG. 4 is a rough drawing of a connection joint of a beam and one side of a screed according to the present invention;

FIG. 5 is a schematic view of a connection structure of a beam and a support steel buckle plate on a connection node at one side of a leveling layer;

FIG. 6 is a schematic cross-sectional structure view of a support steel pinch plate part on a connecting node at one side of a beam and a leveling layer;

FIG. 7 is a schematic view of the connection structure of the rail and the fixing clip thereof;

fig. 8 is a schematic structural view of the fixing clip in a top view;

FIG. 9 is a schematic view of the connection structure of the fastening rail on the cross beam of the present invention;

FIG. 10 is a schematic view of the construction of the guardrail clip;

FIG. 11 is a schematic top view of the guardrail clip;

FIG. 12 is a schematic structural view of a U-bolt;

FIG. 13 is a schematic structural view of the longitudinal and parallel connection formed by the connection of the ends of the cross beam and the angle steel.

Wherein: 1-cast-in-situ bored pile, 2-reinforced concrete longitudinal beam and 3-underpass tunnel; 4-existing line rail, 5-beam, 6-steel rail, 7-bearing platform structure, 8-leveling layer, 9-first connecting bolt, 10-support steel buckle plate, 11-connecting nut, 12-channel steel, 13-steel base plate, 14-buckle rail, 15-rail protection buckle plate, 16-second connecting bolt, 17-reinforcing rib plate, 18-angle steel, 19-fixing fastener and 20-insulating base plate.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

As shown in fig. 1-2, the large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing line track downwards comprises reinforced concrete longitudinal beams 2 erected below two sides of the existing line track 4, the reinforced concrete longitudinal beams 2 are erected on cast-in-situ bored piles 1, at least two of the cast-in-situ bored piles 1 are respectively positioned near the tunnel outer contour at the junction of the underpass tunnel 3 and the existing line track 4, cross beams 5 are erected between the reinforced concrete longitudinal beams 2 at intervals, and steel rails 6 of the existing line track 4 are erected on the cross beams 5. The cast-in-place bored pile 1 is arranged below the existing line track 4 and at the junction of the lower tunnel 3, and the reinforced concrete longitudinal beam 2 and the transverse beam 5 are erected, so that a stable supporting longitudinal and transverse beam frame structure for the existing line track 4 is formed above the lower tunnel 3, on one hand, a main body support bearing settlement deformation during tunnel construction can be formed, on the other hand, construction for further reinforcing the structure can be performed on the main body support, and the supporting and reinforcing capacity for the existing line track is further improved.

In some embodiments, the bored pile 1 is a Φ 1500mmC35 bored pile, and the number of the bored piles 1 may be generally six, as shown in fig. 1, four of them are respectively located near the outer contour of four tunnels where the underpass tunnel 3 and the existing line track 4 are intersected, and the other two of them are respectively located farther away from the underpass tunnel 3 and the existing line track 4 as a group, and each group of the connecting lines is located in a direction perpendicular to the extending direction of the existing line track 4. The optimized design of the six cast-in-situ bored piles 1 can provide safer and more reliable foundation bearing capacity for the longitudinal and transverse beam structure.

In some embodiments, the single-sided reinforced concrete stringers 2 are arranged 6m, or 3-10m outside the same side from the existing line track 4. This distance can be changed by adjusting the position of the cast-in-situ bored pile 1.

In some embodiments, the cast-in-situ bored pile 1 pile top casting bearing platform structure 7 (fig. 2) may be a C40 reinforced concrete bearing platform structure, the pile foundation main reinforcement of the cast-in-situ bored pile 1 is anchored into the bearing platform structure 7, and the reinforced concrete longitudinal beams 2 are erected on the bearing platform structure 7, so as to provide a platform for the longitudinal and transverse beams formed by the upper reinforced concrete longitudinal beams 2 and the transverse beams 5 to overlap with the cast-in-situ bored pile 1. 3cm rubber plates can be further arranged between the beam bottoms of the reinforced concrete longitudinal beams 2 and the bearing platform structure 7 in a cushioning mode. The six cast-in-situ bored piles 1 can form four reinforced concrete longitudinal beams 2 on two sides of a line (an existing line track 4 line), and are distributed on two sides of the line in a length-alternating manner (figure 1). The C40 reinforced concrete section size may be 2m × 1.2m (height × width).

In some embodiments, a reinforced concrete leveling layer 8 (fig. 3) is poured on the reinforced concrete longitudinal beam 2, the beam 5 is erected on the reinforced concrete longitudinal beam 2 through the leveling layer 8, the leveling layer 8 is connected with the reinforced concrete longitudinal beam 2 through stubbled steel bars, and the cross section of the leveling layer 8 is L-shaped, so that on one hand, the beam 5 can be leveled to a proper height to form effective support for the existing line track 4, and on the other hand, the beam structure (beam 5) can be stably connected with the longitudinal beam structure (reinforced concrete longitudinal beam 2).

In some embodiments, as shown in fig. 4-6, the first connecting bolt 9, which may be an M16 bolt, is embedded in the top of the leveling layer 8, the beam 5 is fixed on the leveling layer 8 through a plurality of support steel fastening plates 10, and the support steel fastening plates 10 are provided with mounting holes for the first connecting bolts 9 to pass through, and are mounted and fixed by the cooperation of the connecting nuts 11 and the first connecting bolts 9. The welding pad is equipped with 16mm steel backing plate 13 between 5 bottoms of crossbeam, and the screed-

coat

8, and 5 bottoms of crossbeam, can also weld channel-section steel 12 with 8 overlap joint parts of screed-coat, and steel backing plate 13 and channel-section steel 12 homoenergetic provide the lining structure when connecting for crossbeam 5 and other structures in lower part, and the lining structure uses the steel sheet as main material even, can guarantee that bolted connection structure is stable at the atress of contact surface. Wherein, the bolt and the nut (the first connecting bolt 9 and the connecting nut 11, and the second connecting bolt 16 and the nut thereof below) are enough to be a fastening connection pair, which is a common connecting assembly in engineering.

In some embodiments, a clip rail 14 (fig. 9) is also mounted on the cross beam 5 along the existing wire track 4. The fastening rail 14 and the beam 5 can be connected by a guard rail fastening plate 15 (shown in fig. 10-11), a second connecting bolt 16 and nuts thereof respectively positioned at two sides of the guard rail fastening plate 15, the second connecting bolt 16 can be a U-shaped bolt (shown in fig. 12), the second connecting bolt 16 penetrates through the channel steel 12 to form stable stress, and the gap can be filled with cork. The fastening rail 14 and the sleeper (on the existing line rail 4, the spacing part between the cross beams 5) can also adopt a guard rail fastening plate 15, a second connecting bolt 16 and a nut thereof which are respectively positioned at two sides of the guard rail fastening plate 15 to be firmly connected, and the gap is filled with cork. The connecting structure of the buckling rails 14 and the cross beams 5 and/or sleepers can connect the existing line rails 4 and the cross beams 5 into a whole, and the cross beam structure can directly and effectively bear the influence generated by the existing line rails above, so that the safe operation of the existing line rails is ensured. The fastening rail 14 is divided into two side fastening rails and a central fastening rail, the two side fastening rails can be composed of three old steel rails, the central fastening rail can be composed of five old steel rails, and a temporary shuttle head can be additionally arranged.

In some embodiments, the cross beams 5 are I45b I-steel, which may be Q235, and the cross beams 5 may be fastened together with short wood. Reinforcing rib plates 17 (figure 4) are respectively arranged at the positions of the lower part and two ends of the steel rail 5, which are connected with the leveling layer 8 in an erecting mode, on the cross beam 5, the reinforcing rib plates 17 can be welded in grooves on two sides of the I-shaped steel, one reinforcing rib plate is arranged every 100mm, 3-6 reinforcing rib plates are arranged every position, and the stability and the bearing capacity of the I-shaped steel can be improved through the reinforcing rib plates 17. The reinforcing ribs 17 at both ends of the beam 5 can also be located in the support steel gusset 10 (fig. 6).

In some embodiments, the ends of the cross beam 5 are welded by angle steels 18 to form a longitudinal and parallel connection (fig. 13), so that the cross beam 5 can be structurally connected into a whole to bear the influence of the existing line track structure, and the position is stable and not easy to misplace.

In some embodiments, fixing clips 19 (fig. 7-8) are disposed on two sides of the rail 6, the fixing clips 19 are welded and fixed on the cross beam 5, so as to clamp and fix the rail 6, thereby forming an effective support for the rail 6 by the cross beam 5, and meanwhile, an insulating pad 20 is padded at the joint of the bottom of the center of the rail 6 and the cross beam 5 to avoid interference on electrical signals. The thickness of the leveling layer 8 can be adjusted according to the requirement, and the beam 5, the insulating base plate 20 and the steel rail 6 are tightly combined (figure 3).

When the structure is adopted, firstly, cast-in-situ bored piles 1 are constructed on two sides in the line direction, a bearing platform structure 7 is cast on the pile top, then reinforced concrete longitudinal beams 2 are erected on the bearing platform structure 7, cross beams 5 are installed at certain intervals, then a leveling layer 8 is cast and adjusted to a proper height, and finally other reinforcing structures such as buckling rails 14 are constructed, so that a stable long-span longitudinal and transverse beam structure is finally formed, the excavation of a tunnel below can be carried out, and the span of the structure can reach 24-36 m.

The scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or substitutions within the technical scope of the present invention, and the present invention is covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The large-span longitudinal and transverse beam structure for assisting the tunnel to penetrate through the existing linear track comprises reinforced concrete longitudinal beams (2) erected below two sides of the existing linear track (4), the reinforced concrete longitudinal beams (2) are erected on cast-in-place bored piles (1), at least two of the cast-in-place bored piles (1) are respectively located near the tunnel outer contour at the junction of the tunnel (3) and the existing linear track (4), cross beams (5) are erected between the reinforced concrete longitudinal beams (2) at intervals, and steel rails (6) of the existing linear track (4) are erected on the cross beams (5).

2. The large-span longitudinal and transverse beam structure for assisting tunnel underpass of the existing line track is characterized in that the cast-in-situ bored piles (1) are at least six in design, four of the cast-in-situ bored piles are respectively positioned near the outer contour of four tunnels at the junction of the underpass tunnel (3) and the existing line track (4), the other two far away from the four tunnels are respectively used as a group, and each group of connecting lines are positioned in the direction perpendicular to the extending direction of the existing line track (4); the reinforced concrete longitudinal beam (2) is provided with at least two ends capable of crossing the junction of the underpass tunnel (3) and the existing line track (4); the single-side reinforced concrete longitudinal beam (2) is arranged 3-10m away from the same side of the existing linear track (4).

3. The large-span longitudinal and transverse beam structure for assisting tunnel underpass of an existing linear track is characterized in that the pile top pouring bearing platform structure (7) of the cast-in-situ bored pile (1) is a C40 reinforced concrete bearing platform structure, pile foundation main reinforcements of the cast-in-situ bored pile (1) are anchored into the bearing platform structure (7), and reinforced concrete longitudinal beams (2) are erected on the bearing platform structure (7); a rubber plate is further arranged between the beam bottom of the reinforced concrete longitudinal beam (2) and the bearing platform structure (7).

4. The large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing linear track is characterized in that a reinforced concrete leveling layer (8) is poured on the reinforced concrete longitudinal beam (2), the transverse beam (5) is erected on the reinforced concrete longitudinal beam (2) through the leveling layer (8), the leveling layer (8) is connected with the reinforced concrete longitudinal beam (2) through stubbled connecting steel bars, and the cross section of the leveling layer (8) is L-shaped; and the leveling layer (8) is configured to enable the cross beam (5) to provide stable support for the steel rail (6).

5. The large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing linear track is characterized in that support steel buckling plates (10) are arranged on the cross beam (5), and the cross beam (5) is fixed on the leveling layer (8) through a plurality of support steel buckling plates (10) and fastening connection pairs; the welding pad is equipped with steel backing plate (13) between crossbeam (5) bottom and screed-coat (8), and crossbeam (5) bottom, the welding of part has channel-section steel (12) with screed-coat (8) overlap joint, and steel backing plate (13) and channel-section steel (12) are used for providing the pad lining structure when connecting for crossbeam (5) and other structures of lower part respectively.

6. The large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing linear track is characterized in that the cross beams (5) are I45b I-shaped steel made of Q235, and the cross beams (5) are dead-headed by short wood; reinforcing rib plates (17) are respectively arranged on the cross beam (5) at the positions below the steel rail (6) and at the erection joint of the two ends and the leveling layer (8), the reinforcing rib plates (17) can be welded in grooves on the two sides of the I-steel, one reinforcing rib plate is arranged every 100mm, and 3-6 reinforcing rib plates are arranged every position; the reinforcing rib plates (17) at the two ends of the beam (5) are positioned in the support steel buckle plate (10).

7. The large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing linear track is characterized in that the ends of the transverse beams (5) are welded by angle steel (18) to form longitudinal and parallel connection.

8. The large-span longitudinal and transverse beam structure for assisting tunnel underpass of an existing line rail according to claim 1, characterized in that a fastening rail (14) is further erected on the cross beam (5) along the existing line rail (4), and the fastening rail (14) is configured to be connected with the cross beam (5) and/or a sleeper through a connecting structure.

9. The large-span longitudinal and transverse beam structure for assisting tunnel underpass of the existing line rail is characterized in that a rail guard buckle plate (15) and second connecting bolts (16) and nuts thereof respectively positioned at two sides of the rail guard buckle plate (15) are adopted between the buckle rail (14) and the transverse beam (5), and the second connecting bolts (16) are U-shaped bolts; the fastening rail (14) and the sleeper are firmly connected by a rail protection fastening plate (15), second connecting bolts (16) respectively positioned on two sides of the rail protection fastening plate (15) and nuts thereof; the buckling rails (14) are divided into two side buckling rails and a center buckling rail, the two side buckling rails are composed of three old steel rails, and the center buckling rail is composed of five old steel rails.

10. The large-span longitudinal and transverse beam structure for assisting the tunnel to pass through the existing linear track is characterized in that fixing clamping pieces (19) are arranged on two sides of a steel rail (6), the fixing clamping pieces (19) are welded and fixed on a cross beam (5) to clamp and fix the steel rail (6), and an insulating base plate (20) is padded at the joint of the central bottom of the steel rail (6) and the cross beam (5).