Reinforcing structure for tunnel close to and underneath passing existing expressway
By adopting sheet pile structures, steel pipe piles and pipe curtain reinforcement structures in tunnel construction, the settlement and safety problems of tunnel construction on highways are solved, and the effect of reducing settlement risks and improving construction safety is achieved.
Patent Information
- Application Number
- CN202420738161.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-11
AI Technical Summary
In tunnel construction, when passing through an existing expressway close to the existing one, it is easy to cause settlement, displacement and structural damage to the expressway, and construction safety is difficult to ensure, especially in the case of small clear distances or ultra-small clear distances.
Adopt a sheet pile structure, steel pipe pile and pipe curtain reinforcement structure, including drilled piles, cover plates, longitudinal beams, steel pipe piles and steel top pipes, combined with herringbone drainage slopes and drainage blind ditches, through settlement joints and waterproof layer The design of the belt ensures the stability of the pile plate structure and the stability of the middle clamp rock, reduces the impact on the expressway, and improves construction safety.
It effectively reduces the impact of tunnel construction on highways, reduces settlement risks, improves construction safety, and ensures the stability and safety of tunnel construction.
Smart Images
Figure CN222161357U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of tunnel engineering reinforcement, and in particular relates to a tunnel reinforcement structure that is close to and underpasses an existing expressway. Background Art
[0002] With the development of my country's transportation industry, different traffic routes inevitably intersect with each other. In tunnel construction, it is common to cross existing highways closely, and this situation is often a small or ultra-small clearance. Tunnel construction will cause irreversible impacts on existing highways, such as settlement, displacement, structural damage, etc. These impacts may not only destroy the normal use of existing structures, but also cause serious safety accidents. At the same time, due to the shallow burial depth, the safety of tunnel construction cannot be guaranteed.
[0003] Therefore, it is hoped that a tunnel that passes under an existing highway can effectively reinforce the tunnel and the stratum, reduce the impact of tunnel construction on the existing highway, and ensure the safety of shallow tunnel construction. Utility Model Content
[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described below.
[0005] The utility model provides the following technical solutions: a tunnel underpass under an existing highway reinforcement structure, comprising a sheet pile structure, steel pipe piles and a pipe curtain; the sheet pile structure comprises bored cast-in-place piles arranged at intervals along the tunnel excavation direction on both sides of the tunnel profile, and a cover plate located at the top of the tunnel profile; longitudinal beams are connected between the tops of the bored cast-in-place piles on the same side of the tunnel profile, and the cover plate is connected to the longitudinal beams on both sides of the tunnel profile;
[0006] The steel pipe piles are located on both sides of the tunnel outline and outside the sheet pile structure. The steel pipe piles are arranged at intervals along the tunneling direction.
[0007] The pipe curtain is located in the arch part of the tunnel profile.
[0008] Furthermore, a herringbone drainage slope is arranged on the top surface of the cover plate along the tunnel excavation direction, and drainage blind ditches are arranged at the bottom of the slopes on both sides of the herringbone drainage slope perpendicular to the tunnel excavation direction.
[0009] Furthermore, in the tunnel excavation direction, the sheet pile structure is divided into two parts, a settlement joint is arranged between the left and right parts of the sheet pile structure, an embedded waterstop is arranged in the settlement joint, a waterproof layer is arranged on the outside of the settlement joint, and the settlement joint is filled with polyethylene foam plastic boards and polyvinyl chloride putty.
[0010] Furthermore, the pipe curtain includes a steel top pipe, and a locking angle steel male buckle and a locking angle steel female buckle are respectively provided at both ends of the diameter of the steel top pipe. The locking angle steel male buckle includes two back-to-back angle steels, and the locking angle steel female buckle includes two face-to-face angle steels. The steel top pipes are connected to each other through the locking angle steel male buckle and the locking angle steel female buckle to form a pipe curtain.
[0011] Furthermore, a grouting conduit is arranged on the outside of the steel top pipe.
[0012] Furthermore, a ring of the pipe curtain is arranged at 160° in a circumferential direction, the circumferential spacing between the steel top pipes is 0.35m, and the length of the steel top pipes is 36m to 50m.
[0013] Furthermore, the bored piles are φ1.25m reinforced concrete piles, with a pile spacing of 2.5m to 4m along the tunnel excavation direction; the longitudinal beams are 1.75m wide and 1.5m high; the cover plate is 1m thick; the bored piles, longitudinal beams and cover plates are concrete cast bodies of the same grade.
[0014] Furthermore, the steel flower pipe pile comprises a φ108 hot-rolled seamless steel pipe, the diameter of the grouting holes on the steel pipe wall is φ10-16mm, the grouting holes are distributed in a plum blossom shape, the hole spacing is 15cm to 20cm, and no holes are opened within 1m of the tail of the steel pipe.
[0015] Compared with the prior art, the advantages of the present invention are:
[0016] The utility model provides a tunnel reinforcement structure close to and under an existing highway. By constructing a pile-plate structure, the impact of tunnel construction on the highway and nearby buildings is greatly reduced, the settlement of the highway and the buildings is reduced, and the safety of the tunnel close to and under the highway during construction is ensured. At the same time, steel flower pipe piles are constructed and grouting is performed on both sides of the pile-plate structure, which greatly improves the stability of the pile-plate structure. A pipe curtain is constructed and grouting is performed on the arch of the tunnel contour, which greatly improves the stability of the intermediate rock and ensures the safety of tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the utility model;
[0018] Figure 2 for Figure 1 A top view of
[0019] Figure 3 for Figure 1 A front view of
[0020] Figure 4 This is a schematic diagram of the structure of the pipe curtain.
[0021] In the figure: 1- bored pile; 2- longitudinal beam; 3- cover plate; 4- drainage blind ditch; 5- settlement joint; 6- steel flower pipe pile; 7- steel jacking pipe; 8- locking angle steel female buckle; 9- grouting conduit; 10- locking angle steel male buckle. DETAILED DESCRIPTION
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] like Figure 1 , Figure 2 , Figure 3 A tunnel reinforcement structure that passes under an existing highway close to the highway includes a sheet pile structure, steel pipe piles 6 and a pipe curtain; the sheet pile structure includes bored cast-in-place piles 1 arranged at intervals on both sides of the tunnel contour along the tunnel excavation direction, and a cover plate 3 located on the top of the tunnel contour; longitudinal beams 2 are connected between the tops of the bored cast-in-place piles 1 on the same side of the tunnel contour, and the cover plate 3 is connected to the longitudinal beams 2 on both sides of the tunnel contour; the steel pipe piles 6 are located on both sides of the tunnel contour and outside the sheet pile structure, and the steel pipe piles 6 are arranged at intervals along the tunnel excavation direction; the pipe curtain is located at the arch of the tunnel contour.
[0024] A herringbone drainage slope is arranged on the top surface of the cover plate 3 along the tunnel excavation direction, and the drainage slope is 2%. Drainage blind ditches 4 are arranged at the bottom of the slopes on both sides of the herringbone drainage slope perpendicular to the tunnel excavation direction.
[0025] In the tunnel excavation direction, the sheet pile structure is divided into two parts, a 5 cm wide settlement joint 5 is arranged between the left and right parts of the sheet pile structure, a buried waterstop is arranged in the settlement joint 5, a 50 cm wide waterproof layer belt is arranged outside the settlement joint 5, and the settlement joint 5 is filled with polyethylene foam plastic boards and polyvinyl chloride putty.
[0026] like Figure 4 As shown: the pipe curtain includes a steel top pipe 7, the diameter of the steel top pipe 7 is φ299*10mm, and the two ends of the diameter of the steel top pipe 7 are respectively provided with a locking angle steel male buckle 10 and a locking angle steel female buckle 8, the locking angle steel male buckle 10 includes two back-to-back angle steels, the locking angle steel female buckle 8 includes two face-to-face angle steels, and the angle steels constituting the locking angle steel male buckle 10 and the locking angle steel female buckle 8 are 63*40*6mmm unequal-leg angle steels, and the steel top pipes 7 are connected in pairs through the locking angle steel male buckle 10 and the locking angle steel female buckle 8 to form a pipe curtain.
[0027] A grouting conduit 9 with a specification of 32*3 mm is arranged outside the steel top pipe 7, and a curing agent is added through the grouting conduit 9 to control the settlement.
[0028] The pipe curtain is provided with a ring of 160° in the circumferential direction, the circumferential spacing between the steel top pipes 7 is 0.35m, and the length of the steel top pipes 7 is 36m to 50m.
[0029] The bored piles 1 are φ1.25m reinforced concrete piles, with a pile spacing of 2.5m to 4m along the tunnel excavation direction; the longitudinal beam 2 is 1.75m wide and 1.5m high; the cover plate 3 is 1m thick; the bored piles 1, longitudinal beam 2 and cover plate 3 are cast with C35 erosion-resistant concrete.
[0030] The reinforcement depth of the steel pipe pile 6 is 2m below the bottom of the invert of the tunnel profile, and the grouting adopts cement paste. The steel pipe pile 6 includes a φ108 hot-rolled seamless steel pipe, and the diameter of the grouting holes on the steel pipe wall is φ10-16mm. The grouting holes are distributed in a plum blossom shape, and the hole spacing is 15cm to 20cm. No holes are opened within 1m of the tail of the steel pipe.
[0031] The construction steps of a tunnel approaching and underpassing the existing highway reinforcement structure are as follows:
[0032] Step 1: When the tunnel is excavated near the existing highway, the face is sealed with shotcrete, tunnel construction is suspended, the surface site is leveled, the road facilities of the existing highway are dismantled and protected, and preparations are made for the construction of the sheet pile structure;
[0033] Step 2: Excavate the foundation pit. Excavate the foundation pit at the location where the tunnel passes under the existing highway. Steel sheet piles are used for protection during the foundation pit excavation. The verticality of the steel sheet piles must be controlled when they are driven in.
[0034] Step 3: In the excavated foundation pit, measure and lay out according to the design drawings to determine the position of each bored pile 1, use a rotary drilling rig to drill holes at the pile positions, put in the pre-made steel cages after the holes are formed, and then pour concrete in batches to form piles;
[0035] Step 4: Cast the longitudinal beam 2 and cover plate 3 of the sheet pile structure. The beam and plate reinforcement is uniformly prefabricated by the reinforcement processing plant. The template adopts a combined steel template. When pouring the cover plate 3 and the longitudinal beam 2 concrete, the embedded parts of the relevant components should be pre-buried;
[0036] Step 5: construct steel pipe piles 6 and Φ108 steel pipe grouting reinforcement. After the construction is completed, the foundation pit within the original expressway range is backfilled with C35 concrete to restore the existing expressway to use;
[0037] Step 6: When the tunnel passes under the existing highway, the arch is reinforced with pipe curtain in advance. Therefore, a pipe curtain studio needs to be built in advance in the tunnel. The net height of the studio is 1.8m and the longitudinal length is 11m. The lining of the expanded section is used as the reaction wall for the pipe curtain construction. The pipe curtain construction is carried out from both sides of the inside.
[0038] Step 7: After the sheet pile structure and pipe curtain construction are completed, tunnel excavation will begin, and the settlement and deformation of nearby buildings will be monitored, and data will be returned in a timely manner to guide the construction of the tunnel support structure.
[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A tunnel underpasses an existing highway reinforcement structure, characterized in that: The invention comprises a sheet pile structure, steel pipe piles (6) and a pipe curtain; the sheet pile structure comprises bored cast-in-place piles (1) arranged at intervals along the tunnel excavation direction on both sides of the tunnel profile, and a cover plate (3) located at the top of the tunnel profile; longitudinal beams (2) are connected between the tops of the bored cast-in-place piles (1) on the same side of the tunnel profile, and the cover plate (3) is connected to the longitudinal beams (2) on both sides of the tunnel profile; The steel pipe piles (6) are located on both sides of the tunnel outline and outside the sheet pile structure, and the steel pipe piles (6) are arranged at intervals along the tunnel excavation direction; The pipe curtain is located in the arch part of the tunnel profile.
2. A tunnel underpass under an existing highway reinforcement structure according to claim 1, characterized in that: The top surface of the cover plate (3) is provided with a herringbone drainage slope along the tunnel excavation direction, and drainage blind ditches (4) are provided at the bottom of the slopes on both sides of the herringbone drainage slope perpendicular to the tunnel excavation direction.
3. A tunnel underpass under an existing highway reinforcement structure according to claim 2, characterized in that: In the tunnel excavation direction, the sheet pile structure is divided into two parts, a settlement joint (5) is arranged between the left and right parts of the sheet pile structure, a buried water stop strip is arranged in the settlement joint (5), a waterproof layer strip is arranged outside the settlement joint (5), and the settlement joint (5) is filled with polyethylene foam plastic board and polyvinyl chloride cement.
4. A tunnel underpass under an existing highway reinforcement structure according to claim 1 or 3, characterized in that: The pipe curtain comprises a steel top pipe (7), and the two ends of the diameter of the steel top pipe (7) are respectively provided with a locking angle steel male buckle (10) and a locking angle steel female buckle (8), the locking angle steel male buckle (10) comprises two angle steels back to back, and the locking angle steel female buckle (8) comprises two angle steels facing each other. The steel top pipes (7) are connected to each other by locking angle steel male buckles (10) and locking angle steel female buckles (8) to form a pipe curtain.
5. The tunnel underpass reinforcement structure of an existing highway according to claim 4, characterized in that: A grouting conduit (9) is arranged on the outside of the steel top pipe (7).
6. A tunnel underpass under an existing highway reinforcement structure according to claim 5, characterized in that: The pipe curtain is provided with a ring at a circumferential angle of 160 degrees, the circumferential spacing between the steel top pipes (7) is 0.35m, and the length of the steel top pipes (7) is 36m to 50m.
7. The tunnel underpass reinforcement structure of an existing highway according to claim 1, characterized in that: The bored piles (1) are φ1.25m reinforced concrete piles, with a pile spacing of 2.5m to 4m along the tunnel excavation direction; the longitudinal beam (2) is 1.75m wide and 1.5m high; the cover plate (3) is 1m thick; the bored piles (1), longitudinal beam (2) and cover plate (3) are concrete castings of the same grade.
8. The tunnel underpass reinforcement structure of an existing highway according to claim 7, characterized in that: The steel flower pipe pile (6) comprises a φ108 hot-rolled seamless steel pipe, the diameter of the grouting holes on the steel pipe wall is φ10-16mm, the grouting holes are distributed in a plum blossom shape, the hole spacing is 15cm to 20cm, and no holes are opened within 1m of the tail of the steel pipe.