Control structure for super-small clear distance over-crossing existing tunnel of newly-built underground excavation tunnel

Abstract

The utility model provides a control structure for an ultra-small clear distance over-crossing existing tunnel of a newly-built subsurface tunnel, which belongs to the technical field of tunnel and underground engineering construction, and comprises a plurality of pile bodies and a special-shaped pipe-jacking beam, the plurality of pile bodies are respectively arranged on two sides of the existing tunnel, and the special-shaped pipe-jacking beam is fixedly connected to the pile tops of the plurality of pile bodies; an arc-shaped groove is formed in the upper end of the special-shaped pipe jacking beam, and the lower end of the newly-built subsurface tunnel supporting structure is arranged in the arc-shaped groove. The multiple pile bodies and the special-shaped pipe jacking beam are combined to form a special-shaped bench beam structure and stride over the existing tunnel, a coping structure for the existing tunnel is formed, and the special-shaped bench beam structure is located below the newly-built subsurface tunnel. According to the control structure for the ultra-small clear distance over-crossing existing tunnel of the newly-built underground excavation tunnel, the upper tunnel and the lower tunnel are separated through the special-shaped bench beam structure composed of the special-shaped pipe jacking beams and the pile bodies, the influence generated by excavation unloading of the newly-built tunnel is borne, and springback deformation of the existing tunnel caused by excavation of the newly-built tunnel is effectively resisted.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel and underground engineering construction technology, and more specifically, it relates to a control structure for a newly constructed mined tunnel with an ultra-small clearance spanning an existing tunnel. Background Technology

[0002] Rapid economic development has driven the development of transportation. With the continuous improvement of urban rail transit systems, subway networks are becoming increasingly complex, leading to more and more instances of multiple lines intersecting within the same underground space. When a newly constructed mined tunnel crosses an existing tunnel at close range, the unloading during excavation disrupts the original equilibrium of the soil, causing structural deformation of the existing tunnel below and affecting its normal operation.

[0003] When using existing grouting techniques to reinforce existing tunnels, grout leakage and runoff are common problems during construction due to factors such as groundwater and complex geological conditions, making it difficult to achieve the desired reinforcement effect. This is especially true when a new tunnel crosses an existing tunnel with a very small clearance, causing greater disturbance to the existing tunnel and increasing the construction difficulty. To prevent safety hazards caused by the uplift of the existing tunnel due to the excavation of a new tunnel, a deformation control measure is needed to ensure the safe construction of the new tunnel and the normal operation of the existing tunnel. Utility Model Content

[0004] The purpose of this utility model is to provide a control structure for a newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel, aiming to solve the technical problem of safety hazards caused by the upward deformation of the existing tunnel due to the excavation of the new tunnel.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel, comprising:

[0006] Multiple piles are placed on both sides of the existing tunnel, arranged vertically, with the pile ends embedded in the stratum.

[0007] An irregularly shaped pipe jacking beam is fixedly connected to the top of multiple piles. The irregularly shaped pipe jacking beam is horizontally arranged with its two ends located on both sides of the existing tunnel. The upper end of the irregularly shaped pipe jacking beam has an arc-shaped groove. The lower end of the newly constructed underground tunnel support structure is placed in the arc-shaped groove. The arc-shaped groove is arranged along the length direction of the irregularly shaped pipe jacking beam.

[0008] Among them, multiple piles and the irregularly shaped jacking beams are combined to form an irregularly shaped bench beam structure that straddles the existing tunnel, forming a capping structure for the existing tunnel. The irregularly shaped bench beam structure is located below the newly built mined tunnel.

[0009] In one possible implementation, at least one pile is provided on each side of the existing tunnel, and the irregularly shaped jacking beam and the piles connected to it are combined to form a set of irregularly shaped bench beam structures. Multiple sets of the irregularly shaped bench beam structures are provided across the existing tunnel.

[0010] In one possible implementation, the newly constructed tunnel is constructed using the CRD method. One of the aforementioned irregular-shaped pipe jacking beams is arranged directly below the left and right lower guide tunnels of the newly constructed tunnel. Multiple piles are respectively connected to the two irregular-shaped pipe jacking beams. The axial direction of the irregular-shaped pipe jacking beams is parallel to the length direction of the newly constructed tunnel. The initial support of the left and right lower guide tunnels of the newly constructed tunnel is placed in the arc-shaped grooves at the upper ends of the two irregular-shaped pipe jacking beams.

[0011] In one possible implementation, the portion of the irregularly shaped jacking beam that intersects with the pile body is cut into a hole.

[0012] In one possible implementation, the pile body includes a reinforcing cage and a first concrete pour, the irregular jacking beam includes a hollow irregular jacking pipe and beam stirrups set inside the irregular jacking pipe, I-beams connected to the beam stirrups and threaded steel bars laid on the upper part of the I-beams, and a second concrete pour inside the irregular jacking pipe, the irregular jacking pipe being a steel pipe having the arc-shaped groove.

[0013] In one possible implementation, the reinforcing cage is a structure formed by combining multiple main bars, multiple spiral stirrups, and multiple reinforcing stirrups; the multiple main bars are arranged vertically and combined to form a circle; the spiral stirrups wrap around the outside of the multiple main bars to form a spiral shape and are connected to the multiple main bars; the reinforcing stirrups are arranged on the inside and are connected to the multiple main bars, and the upper ends of the main bars extend into the jacking pipe.

[0014] In one possible implementation, the upper main reinforcement bars of the steel cage are bent and welded to the I-beam to fix the irregularly shaped jacking beam and the pile body.

[0015] In one possible implementation, the length direction of the I-beam is parallel to the axial direction of the irregular-shaped jacking beam, and the I-beams are multiple and arranged in parallel with equal spacing, with the I-beams located in the lower middle part of the irregular-shaped jacking beam.

[0016] In one possible implementation, the outer wall of the pile body is provided with a protective wall structure.

[0017] In one possible implementation, the diameter of the pile is smaller than the diameter of the irregularly shaped jacking beam.

[0018] The beneficial effects of the control structure for a newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel provided by this utility model are as follows: Compared with the prior art, the control structure for a newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel includes multiple piles and an irregularly shaped jacking beam. Multiple piles are respectively placed on both sides of the existing tunnel, and the irregularly shaped jacking beam is fixedly connected to the top of the piles. The upper end of the irregularly shaped jacking beam has an arc-shaped groove, and the lower end of the support structure for the newly constructed underground tunnel is placed within the arc-shaped groove. The multiple piles and the irregularly shaped jacking beam combine to form an irregularly shaped bench beam structure that straddles the existing tunnel, forming a pressure structure for the existing tunnel. The irregularly shaped bench beam structure is located below the newly constructed underground tunnel. This solves the technical problem of safety hazards caused by the upward deformation of the existing tunnel due to the ultra-small clearance spanning of a newly constructed underground tunnel. The irregularly shaped bench beam structure, composed of the irregularly shaped jacking beam and piles, separates the upper and lower tunnels, bearing the impact of unloading during the excavation of the new tunnel and effectively resisting the rebound deformation of the existing tunnel caused by the excavation of the new tunnel. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional schematic diagram of the positional relationship between the irregularly shaped bench beam structure of the control structure for a newly constructed mined tunnel with an ultra-small clearance spanning an existing tunnel and the tunnel above and below, provided for an embodiment of this utility model.

[0021] Figure 2 A schematic diagram of the irregular bench beam structure for the control structure of a newly constructed mined tunnel with ultra-small clearance crossing an existing tunnel, provided as an embodiment of this utility model.

[0022] Figure 3 A side view of the relative position of the irregularly shaped bench beam and the tunnel in the control structure of the newly constructed mined tunnel with ultra-small clearance crossing the existing tunnel, provided in an embodiment of this utility model.

[0023] Figure 4 The irregularly shaped bench beam, which is the control structure for the newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel, and the cross-sectional view of the newly constructed underground tunnel (after the construction of the irregularly shaped bench beam is completed, before the lower pilot tunnel of the newly constructed underground tunnel has been excavated) are provided for the embodiments of this utility model.

[0024] Figure 5 The irregularly shaped bench beam of the control structure for the newly constructed underground tunnel with ultra-small clearance crossing the existing tunnel, and the cross-sectional view of the newly constructed underground tunnel (after the excavation and support of the lower pilot tunnel of the newly constructed underground tunnel are completed) provided for the embodiments of this utility model;

[0025] Figure 6 Internal structure diagram of the irregularly shaped bench beam, a control structure for a newly constructed mined tunnel with an ultra-small clearance spanning an existing tunnel, provided in this embodiment of the utility model;

[0026] Figure 7 A cross-sectional view of the control structure jacking beam for a newly constructed mined tunnel with an ultra-small clearance spanning an existing tunnel, provided for an embodiment of this utility model (without cast-in-place concrete and without considering cutting);

[0027] Figure 8 A top view of the control structure steel cage structure for a newly constructed mined tunnel with an ultra-small clearance spanning an existing tunnel, provided in an embodiment of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Pile body; 11. Reinforcing cage; 111. Main reinforcement; 112. Spiral stirrups; 113. Reinforcing stirrups; 12. First concrete; 13. Retaining wall structure; 2. I-beam jacking beam; 21. I-beam; 22. Second concrete; 221. Plain concrete cushion layer; 222. Cast-in-place concrete; 23. Jacking pipe; 24. Beam stirrups; 25. Threaded steel bars; 3. Existing tunnel; 4. Newly constructed mined tunnel; 41. Left upper pilot tunnel; 42. Left lower pilot tunnel; 43. Right upper pilot tunnel; 44. Right lower pilot tunnel; 5. Arc-shaped groove; 6. Cutting section; 7. Arc-shaped formwork. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] Please refer to the following: Figures 1 to 8 The present invention describes the control structure for a newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel. The control structure includes multiple piles 1 and a shaped jacking beam 2. The piles 1 are vertically positioned on both sides of the existing tunnel 3, with their ends embedded in the ground. The shaped jacking beam 2 is fixedly connected to the tops of the piles 1, and is horizontally positioned with both ends located on either side of the existing tunnel 3. The upper end of the shaped jacking beam 2 has an arc-shaped groove 5, and the lower end of the support structure for the newly constructed underground tunnel 4 is placed within this arc-shaped groove 5. The arc-shaped groove 5 is positioned along the length of the shaped jacking beam 2. The multiple piles 1 and the shaped jacking beam 2 combine to form a shaped bench beam structure that straddles the existing tunnel 3, creating a pressure structure on the existing tunnel 3. The shaped bench beam structure is located below the newly constructed underground tunnel 4.

[0032] The irregularly shaped jacking beam 2 is formed by placing an arc-shaped template 7 on the arc-shaped groove 5 of the jacking pipe 23, pouring the second concrete 22, etc., and cutting the part overlapping with the initial support during the construction of the pilot tunnel of the newly built mined tunnel 4. The jacking pipe 23 is made of multiple hollow steel pipes welded end to end.

[0033] The control structure provided by this utility model for a newly constructed underground tunnel with an ultra-small clearance spanning an existing tunnel, compared with the prior art, uses multiple piles 1 combined with irregularly shaped pipe jacking beams 2 to form an irregularly shaped bench beam that straddles the existing tunnel 3. The upper end of the irregularly shaped pipe jacking beam 2 has an arc-shaped groove 5, and the lower end of the support structure of the newly constructed underground tunnel 4 is placed in the arc-shaped groove 5, which can realize load transfer and ensure the structural safety of the existing tunnel 3. It solves the technical problem of the safety hazards caused by the excavation of the newly constructed underground tunnel 4 spanning the existing tunnel 3 with an ultra-small clearance and the upward deformation of the existing tunnel 3. The irregularly shaped bench beam structure formed by the irregularly shaped pipe jacking beam 2 and the piles 1 separates the upper and lower tunnels (referring to the existing tunnel 3 and the newly constructed underground tunnel 4), bears the impact of the unloading caused by the excavation of the newly constructed tunnel 4, and effectively resists the rebound deformation of the existing tunnel 3 caused by the excavation of the newly constructed tunnel 4.

[0034] The ultra-small clearance tunnel in this utility model refers to a tunnel arrangement where the thickness of the soil between adjacent tunnels is less than a certain value. With the development of highway, railway, and urban rail transit construction, due to constraints during route selection, the minimum clearance between adjacent tunnels at intersections is often less than a certain value, significantly impacting the structural safety of existing tunnels. Therefore, measures such as the control structure of this utility model are necessary.

[0035] In this embodiment, if there is only one existing tunnel 3, then one pile 1 is installed on each side of the existing tunnel 3, and the irregularly shaped jacking beam 2 spans across the existing tunnel 3 and is connected to the pile 1. If there are two existing tunnels 3 arranged side by side (bidirectional tunnels), then at least three piles 1 are installed, i.e., as shown below. Figure 2 As shown, the central pile 1 is located between two existing tunnels 3, while the irregularly shaped pipe jacking beam 2 is fixedly connected to the upper ends of the three piles 1, forming a structure similar to a "bench," hence the name "irregularly shaped bench beam." The diameter of the irregularly shaped pipe jacking beam 2 is larger than the outer diameter of the pile 1.

[0036] In some embodiments, please refer to Figures 1 to 8At least one pile 1 is installed on each side of the existing tunnel 3. The irregularly shaped pipe jacking beam 2 is combined with the pile 1 connected to it to form a set of irregularly shaped bench beam structures. The pile 1 is stably embedded in the stratum. In order to minimize the upward deformation of the existing tunnel 3, multiple sets of irregularly shaped bench beam structures can be set across the existing tunnel 3. They can be set at equal intervals or close to each other. The arrangement should be reasonable according to the actual situation of the stratum. This can ensure the safe construction of the new mined tunnel 4 and the normal operation of the existing tunnel 3.

[0037] In some embodiments, please refer to Figures 1 to 5 The newly constructed underground tunnel 4 was constructed using the CRD method. Internally, the tunnel is divided into a left upper pilot tunnel 41, a left lower pilot tunnel 42, a right upper pilot tunnel 43, and a right lower pilot tunnel 44. Figure 4 The four areas divided by the newly constructed cut-and-cover tunnel 4 are correspondingly arranged, and this construction method can refer to existing technologies. A special-shaped pipe jacking beam 2 is arranged directly below the left lower guide tunnel 42 and the right lower guide tunnel 44 of the newly constructed cut-and-cover tunnel 4. Multiple piles 1 are respectively connected to the two special-shaped pipe jacking beams 2. The axial direction of the special-shaped pipe jacking beams 2 is parallel to the length direction of the newly constructed cut-and-cover tunnel 4. The left lower guide tunnel 42 and the right lower guide tunnel 44 are respectively placed in the arc-shaped grooves 5 at the upper ends of the two special-shaped pipe jacking beams 2. In this embodiment, this arrangement of the special-shaped pipe jacking beams 2 can maximize the structural safety of the existing tunnel 3, and the effect is good.

[0038] In some embodiments, please refer to Figures 1 to 8 The part of the jacking pipe 23 that intersects with the pile body 1 needs to be cut into a hole so that the pile body 1 can pass through the jacking pipe 23 during construction and the pile body 1 can be fixedly connected to the irregular jacking pipe beam 2.

[0039] In some embodiments, please refer to Figures 1 to 8 The pile body 1 includes a reinforcing cage 11 and a first concrete 12. The irregularly shaped jacking beam 2 includes a hollow irregularly shaped jacking pipe 23, beam stirrups 24 set inside the irregularly shaped jacking pipe 23, I-beams 21 connected to the beam stirrups 24, threaded steel bars 25 laid on top of the I-beams 21, and a second concrete 22. The use of I-beams 21 and threaded steel bars 25 enhances the structural rigidity of the irregularly shaped jacking beam 2. After the first concrete 12 solidifies, it bonds with the reinforcing cage 11 to form a whole, namely the pile body 1. After the second concrete 22 solidifies, it combines with the beam stirrups 24, I-beams 21, and threaded steel bars 25 to form a whole, namely the irregularly shaped jacking beam 2.

[0040] Specifically, the second concrete 22 includes a plain concrete cushion layer 221 and a cast-in-place concrete 222. The plain concrete cushion layer 221 is located below the I-beam 21, forming a support for the I-beam 21, and is constructed first. The cast-in-place concrete 222 is located above the plain concrete cushion layer 221, and is cast after the I-beam 21, threaded steel bars 25, etc. are laid, so that the inside of the jacking pipe 23 is filled, and is constructed later.

[0041] The reinforcing cage 11 is a structure formed by combining multiple main reinforcing bars 111, multiple spiral stirrups 112, and multiple reinforcing stirrups 113. The main reinforcing bars 111 are vertically arranged and combined to form a circle. The spiral stirrups 112 wrap around the outside of the circular main reinforcing bars 111, forming a spiral shape, and are welded or tied to the main reinforcing bars 111. The reinforcing stirrups 113 are arranged on the inside and are welded or tied to the main reinforcing bars 111. The upper ends of the main reinforcing bars 111 extend into the holes of the jacking beam 2 and are placed inside the jacking pipe 23. The pile body 1 serves as an anti-tension pile. During welding, the concrete at the pile head of the pile body 1 is broken to expose the main reinforcing bars 111 extending from the upper end of the reinforcing cage 11. The main reinforcing bars 111 are then bent, anchored into the jacking pipe 23, and then welded to the I-beam 21. This welding connection permanently fixes the irregularly shaped jacking beam 2 and the pile body 1 into a whole, improving the overall structural stability. After welding, at the corresponding position of the invert arch of the newly constructed underground tunnel 4, an arc-shaped template 7 with the same shape as the initial support is fixed in the jacking pipe 23. Then, a second concrete 22 is poured inside the jacking pipe 23 below the arc-shaped template 7. During the excavation of the newly constructed underground tunnel 4, the steel pipes on the jacking pipe beam 2 that overlap with the newly constructed underground tunnel 4 are cut to form an arc-shaped groove 5. This arc-shaped groove 5 is used to support the support structure of the newly constructed underground tunnel 4. Figure 5 The black part in the middle represents the arc-shaped template 7, which is placed on the upper part of the arc-shaped groove 5 of the top pipe 23. Figure 4 The dashed line on the irregular pipe jacking beam 2 represents the cut portion 6 of the pipe jacking 23, and the solid line represents the remaining portion of the pipe jacking 23.

[0042] In some embodiments, please refer to Figures 1 to 8 The length direction of the I-beam 21 is parallel to the axis of the irregular jacking beam 2. There are multiple I-beams 21 arranged in parallel and at equal intervals. The I-beams 21 are located in the lower middle part of the inner side of the irregular jacking beam 2.

[0043] In some embodiments, please refer to Figures 1 to 8 The outer wall of the pile body 1 is provided with a protective wall structure 13.

[0044] The retaining wall structure 13 is used when the soil below the surface of a bored pile is subjected to earth pressure during excavation, which often leads to soil collapse. To ensure the safety and quality of bored pile construction, retaining wall measures are usually required, especially in complex geological conditions. Different types of retaining wall structures 13 should be used for different soil conditions, taking into account structural strength and economic costs. Commonly used retaining wall structures 13 include: brick retaining wall, cast-in-place concrete retaining wall, steel sleeve retaining wall, shotcrete quick-setting concrete retaining wall, and corrugated steel formwork tool-type retaining wall. In special cases, retaining walls are also used for the enlarged head portion of the pile end, such as combined steel plate concrete retaining walls. Each type of retaining wall has its advantages, disadvantages, and applicable scope. The appropriate retaining wall structure should be selected based on the specific engineering geological and hydrogeological conditions of the site, ensuring the safety of construction personnel, and comprehensively considering factors such as construction period and economy.

[0045] In some embodiments, please refer to Figures 1 to 5 Pile 1 is a bored pile. Bored piles are reinforced concrete piles that are manually excavated and cast on-site. Their installation method or construction method can be found in existing technology. For example... Figure 6 As shown, the portion of the manually excavated bored pile above the irregularly shaped jacking beam 2 is an empty pile, and the first concrete 11 is not poured. During the excavation of the newly constructed mined tunnel 4, the excess artificial retaining wall above the irregularly shaped jacking beam is removed. The first concrete 11 is poured from bottom to top up to the height of the plain concrete cushion layer 221, and then pouring is stopped, exposing the main reinforcement 111. If the main reinforcement 111 is not exposed, it can be exposed by manual chiseling. Only after it is exposed can it be welded to the I-beam 21.

[0046] The diameter, length, and quantity of the irregular pipe jacking beam 2 and pile 1 under the newly built tunnel 4 are set according to the actual engineering needs; the net distance between the pile 1 and the existing tunnel 3 should not be too small, so as to prevent the construction of the pile 1 from having an adverse effect on the existing tunnel 3.

[0047] This utility model proposes a deformation control structure based on the ultra-small clearance between a newly constructed underground tunnel 4 and an existing tunnel 3, which has at least the following advantages and effects:

[0048] (1) During the construction process, the pile body 1 can be constructed in the underground tunnel and is not affected by external conditions; the construction of the irregular pipe beam 2 is carried out in the working well, which has little impact on ground traffic.

[0049] (2) This utility model separates the upper and lower tunnels by forming an irregular bench beam structure consisting of an irregular jacking beam 2 and a pile 1, which bears the impact of unloading during the excavation of the new underground tunnel 4 and effectively resists the rebound deformation of the existing tunnel 3 caused by the excavation of the new underground tunnel 4.

[0050] (3) The irregular bench beam straddles the existing tunnel 3 as its permanent protective structure, which can reduce the adverse effects of the dynamic load of the subway operation on the existing tunnel 3 structure.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A control structure for a newly constructed mined tunnel with an extremely small clearance crossing an existing tunnel, characterized in that, include: Multiple piles are placed on both sides of the existing tunnel, arranged vertically, with the pile ends embedded in the stratum. An irregularly shaped pipe jacking beam is fixedly connected to the top of multiple piles. The irregularly shaped pipe jacking beam is horizontally arranged with both ends located on both sides of the existing tunnel. The upper end of the irregularly shaped pipe jacking beam has an arc-shaped groove. The lower end of the newly constructed underground tunnel support structure is placed in the arc-shaped groove. The arc-shaped groove is arranged along the length direction of the irregularly shaped pipe jacking beam. Among them, multiple piles and the irregularly shaped jacking beams are combined to form an irregularly shaped bench beam structure that straddles the existing tunnel, forming a capping structure for the existing tunnel. The irregularly shaped bench beam structure is located below the newly built mined tunnel.

2. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, At least one pile is installed on each side of the existing tunnel. The irregular-shaped jacking beam and the piles connected to it are combined to form a set of irregular-shaped bench beam structures. Multiple sets of the irregular-shaped bench beam structures are installed across the existing tunnel.

3. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, The newly constructed tunnel is constructed using the CRD method. One of the aforementioned irregular-shaped pipe jacking beams is arranged directly below the left and right lower guide tunnels of the newly constructed tunnel. Multiple piles are respectively connected to the two irregular-shaped pipe jacking beams. The axial direction of the irregular-shaped pipe jacking beams is parallel to the length direction of the newly constructed tunnel. The initial support of the left and right lower guide tunnels of the newly constructed tunnel is placed in the arc-shaped grooves at the upper ends of the two irregular-shaped pipe jacking beams.

4. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, Holes are cut into the portion of the irregularly shaped jacking beam that intersects with the pile.

5. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, The pile body includes a reinforcing cage and a first concrete pour. The irregular jacking beam includes a hollow irregular jacking pipe, beam stirrups set inside the irregular jacking pipe, I-beams connected to the beam stirrups, threaded steel bars laid on the upper part of the I-beams, and a second concrete pour inside the irregular jacking pipe. The irregular jacking pipe is a steel pipe with the arc-shaped groove.

6. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 5, characterized in that, The steel cage is a structure formed by combining multiple main bars, multiple spiral stirrups, and multiple reinforcing stirrups. The multiple main bars are arranged vertically and combined to form a circle. The spiral stirrups wrap around the outside of the multiple main bars to form a spiral shape and are connected to the multiple main bars. The reinforcing stirrups are arranged on the inside and are connected to the multiple main bars. The upper ends of the main bars extend into the jacking pipe.

7. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 6, characterized in that, The I-beam is connected to the upper main reinforcement of the steel cage to fix the irregular jacking beam and the pile.

8. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 5, characterized in that, The length direction of the I-beam is parallel to the axial direction of the irregular-shaped jacking beam. There are multiple I-beams arranged in parallel and at equal intervals. The I-beams are located in the lower middle part of the irregular-shaped jacking beam.

9. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, The outer wall of the pile is provided with a protective wall structure.

10. The control structure for a newly constructed mined tunnel with an ultra-small clearance crossing an existing tunnel as described in claim 1, characterized in that, The diameter of the pile is smaller than the diameter of the irregularly shaped jacking beam.

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