Super-close-distance side-penetrating single-pile reinforcing structure for tunnel in local narrow space
By adopting a "Γ"-type reinforcement structure in the tunnel ultra-close-distance single-pile reinforcement construction, combined with vertical and horizontal reinforcement piles, the structural safety and construction disturbance control problems of tunnel reinforcement construction in narrow spaces are solved, and efficient and low disturbance reinforcement effect is achieved.
Patent Information
- Application Number
- CN202421432636.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-06-21
AI Technical Summary
Under the narrow space conditions, the tunnel’s ultra-close side-through single pile reinforcement construction faces the problems of structural safety and construction disturbance control, especially in urban buildings-intensive areas, where traditional reinforcement methods are difficult to adapt to the low disturbance construction needs.
A "Γ" type reinforcement structure is adopted, including vertical reinforcement piles set around the engineering piles and horizontal reinforcement piles set on the top of the tunnel. The strength of the soil around the pile and the pile earth friction are enhanced by vertical reinforcement piles, and the piles are horizontally reinforced to isolate the tunnel construction area and the above soil to reduce construction disturbances.
It realizes efficient reinforcement of ultra-close-distance cross-bridge piles in the narrow space of the tunnel, reduces the settlement of existing pile foundations and surface structures, reduces construction disturbances, and is suitable for complex environments in densely packed areas.
Smart Images
Figure CN222878688U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of tunnel engineering, in particular to an ultra-close side-penetrating single pile reinforcement structure in a tunnel under the condition of local narrow space. Background Art
[0002] With the development of tunnel engineering in recent years, tunnels with close side-penetration of pile foundations are common, but it is rare to see tunnels with ultra-close side-penetration of pile foundations at a distance of less than 2m. Under such conditions, if no reinforcement measures are taken, it is very easy to cause instability and damage of bridge piles and superstructures. In the context of large-scale construction of urban tunnels, similar problems will inevitably be faced in the future. In the densely built urban environment, construction also needs to face the problems of limited construction sites and small construction clearance. Therefore, under the condition of narrow space, how to design a high-strength, low-disturbance stratum reinforcement structure to protect the existing single piles and superstructures at the same time to ensure the safety of existing buildings and surfaces is one of the technical difficulties faced in the current and future ultra-close side-penetration of single pile construction in tunnels.
[0003] On the other hand, urban construction and traffic-intensive areas have put forward extremely high requirements for construction disturbance control. The existing pile foundation reinforcement control methods for traditional shield side-penetration include pile foundation underpinning and isolation piles. The pile foundation underpinning method completes the force conversion when the subway passes through by replacing the pile structure, but considering that it requires foundation pit excavation and has a great impact on the stability of the subsequent single pile foundation, and the underpinning construction in traffic and construction-intensive areas has a great impact on the surrounding traffic, this method is difficult to meet the needs of low-disturbance construction of ultra-close side-penetration pile foundations in tunnels in construction and traffic-intensive sections; at the same time, since the net distance between the tunnel and the pile body is less than 2m, it is difficult to use isolation piles for construction. In summary, it is necessary to propose a new reinforcement structure to meet the needs of ultra-close side-penetration pile foundation reinforcement construction in tunnels in narrow construction spaces. Summary of the invention
[0004] The utility model aims to provide a reinforcement structure for a single pile passing through a tunnel at an ultra-close distance in a narrow construction environment, so as to ensure the structural safety of the bridge pile and the tunnel.
[0005] The ultra-close side-penetrating single-pile reinforcement structure for tunnels in narrow spaces described in the utility model comprises a plurality of vertical reinforcement piles arranged around engineering piles to be protected, and horizontal reinforcement piles arranged on the top of the tunnel and connected to the tops of the vertical reinforcement piles; the vertical reinforcement piles comprise a first vertical pile and a second vertical pile whose diameter is smaller than that of the first vertical pile; the pile centers of the four first vertical piles are respectively arranged at the centers of the four sides of the pedestal; the four second vertical piles are respectively arranged between adjacent first vertical piles, and the second vertical piles and adjacent first vertical piles are interlocked with each other; the horizontal reinforcement piles comprise horizontal transition piles connecting the vertical reinforcement piles, and equal-thickness reinforcement piles connecting the horizontal transition piles, and the pile bodies of the horizontal reinforcement piles are interlocked with each other.
[0006] Furthermore, the pile center of the first vertical pile is located no less than 0.2m outside the foundation.
[0007] Furthermore, assuming that the radius of the engineering pile is rp, the distance between the center of the first vertical pile and the edge of the adjacent cap is d1, the engagement depth between the first vertical pile and the engineering pile is d2, the cross-sectional shape of the cap is a square with a side length of a, the diameter R1 of the first vertical pile is: R1≥d1+d2+(a / 2-rp).
[0008] Furthermore, the engagement depth between the second vertical pile and the first vertical pile is 0.4 m.
[0009] Furthermore, the top of the vertical reinforcement pile is located above the centroid of the tunnel, and the distance between the two is the sum of the tunnel radius and the thickness of the horizontal reinforcement pile.
[0010] Furthermore, a line connecting the bottom of the vertical reinforcement pile and the center of the tunnel bottom forms an angle of 45° with the plumb line.
[0011] Furthermore, the bottom of the vertical reinforcement pile is located below the centroid of the tunnel, and the distance between the bottom of the vertical reinforcement pile and the centroid of the tunnel is equal to twice the radius of the tunnel.
[0012] Furthermore, the diameter of the horizontal reinforcement pile is consistent with the diameter of the second vertical pile, and the reinforcement thickness of the horizontal reinforcement pile is greater than 3m.
[0013] Furthermore, the engagement depth between the pile bodies of the horizontal reinforcement piles is 0.4 m.
[0014] Furthermore, a line connecting one end of the equal-thickness reinforcement pile away from the vertical reinforcement pile and the center of the outer edge of the tunnel forms an angle of 45° with the horizontal plane.
[0015] The ultra-close side-through single pile reinforcement structure of the tunnel in a narrow space described in the utility model mainly includes a vertical reinforcement area set around the engineering piles to be protected and a horizontal reinforcement area set at the top of the tunnel, and different MJS method piles are set between each area. Among them, the first vertical pile and the second vertical pile in the vertical reinforcement area have different diameters. They are symmetrically constructed and set around the engineering piles to reinforce the soil around the engineering piles. After the vertical reinforcement area is constructed, the horizontal reinforcement area is constructed. The thickness of the horizontal reinforcement area should be greater than 3 meters. From the cross-section of the tunnel, the horizontal reinforcement area is connected to the vertical reinforcement area in the direction of the bridge pile, and the top and the vertical reinforcement area are kept on the same horizontal plane. The combination of the two constitutes a "Γ" type reinforcement structure. A row of horizontal transition piles is set at the connection between the horizontal reinforcement area of the tunnel and the vertical reinforcement area around the piles, which can ensure the bite and connection of the two reinforcement areas and increase the integrity of the structure; the horizontal reinforcement piles are constructed by skipping piles, and the MJS construction is carried out in the order from close to the engineering piles to far away from the engineering piles. The bureau uses a single pile reinforcement structure with ultra-close side penetration in the narrow space tunnel. The vertical reinforcement piles are used to wrap the engineering piles, which can enhance the strength of the soil around the piles and the pile-soil friction, forming a composite reinforced structure with strong integrity and good reinforcement quality. At the same time, the MJS pile body isolates the tunnel from the pile foundation. The strengthening and isolation effect of the MJS pile on the soil around the pile can effectively reduce the disturbance of the tunnel to the pile foundation; the horizontal reinforcement piles isolate the tunnel construction area from the upper soil, reduce the disturbance of the upper soil during the tunnel construction, and achieve the control of the surface and piles. The purpose of controlling the settlement of the superstructure of the foundation; at the same time, the "Γ"-shaped reinforcement structure composed of vertical reinforcement piles and horizontal reinforcement piles can simultaneously achieve the purpose of controlling the settlement of the pile body and the ground surface, and can be easily promoted and applied to soil reinforcement under similar working conditions; in addition, this type of reinforcement structure does not require open space, has low requirements for clearance, and causes little disturbance to the surrounding area environment during construction. It can be used for reinforcement construction in complex environments such as traffic and building-intensive areas, and realizes the protection of existing pile foundations by ultra-close side-through bridge pile construction in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of a single pile reinforcement structure for ultra-close side penetration of a tunnel in a narrow space.
[0017] Figure 2 It is a structural schematic diagram of a single pile reinforcement structure for ultra-close side penetration of a tunnel in a narrow space.
[0018] Figure 3 It is a structural diagram of vertical reinforcement piles. DETAILED DESCRIPTION
[0019] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0021] If there are descriptions involving "first" or "second" in the embodiments of the utility model, the descriptions of "first" or "second" are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0022] The utility model provides a single pile reinforcement structure for side-penetrating a tunnel in a narrow space at an ultra-close distance.
[0023] The ultra-close side-penetrating single-pile reinforcement structure of a tunnel in a narrow space of this embodiment comprises a plurality of vertical reinforcement piles 1 arranged around the engineering piles to be protected, and horizontal reinforcement piles 2 arranged on the top of the tunnel and connected to the tops of the vertical reinforcement piles; the vertical reinforcement piles comprise a first vertical pile 11 and a second vertical pile 12 having a diameter smaller than that of the first vertical pile; the pile centers of the four first vertical piles are respectively arranged at the centers of the four sides of the pedestal; the four second vertical piles are respectively arranged between adjacent first vertical piles, and the second vertical piles and the adjacent first vertical piles are interlocked with each other; the horizontal reinforcement piles comprise a horizontal transition pile 21 connecting the vertical reinforcement piles, and an equal-thickness reinforcement pile 22 connecting the horizontal transition piles, and the pile bodies of the horizontal reinforcement piles are interlocked with each other.
[0024] In the ultra-close side-through single pile reinforcement structure of the tunnel in the narrow space, the distance between the center of the first vertical pile 11 and the edge of the adjacent cap is not less than 0.2m, and this distance is set to d1, and the bite depth between the first vertical pile and the engineering pile is d2, the cross-sectional shape of the cap is a square with a side length of a, and the radius of the engineering pile is rp, then the diameter R1 of the first vertical pile is: R1≥d1+d2+(a / 2-rp). In addition, the bite depth between the second vertical pile 12 and the first vertical pile 11 is 0.4m to ensure the integrity of the reinforcement area.
[0025] In the ultra-close side-through single-pile reinforcement structure of the tunnel in the narrow space, the diameter of the horizontal reinforcement pile 2 is consistent with the diameter of the second vertical pile 12; the bite depth between the pile bodies of the horizontal reinforcement piles is 0.4m; and the reinforcement thickness of the horizontal reinforcement piles is greater than 3m, and the thickness is set as S2. Among them, the top of the horizontal transition pile is located above the top of the tunnel, and the bottom depth is related to the position of the tunnel section to ensure that the bottom of the MJS pile body is located at least 2m below the outer edge contour line of the tunnel. The role of this transition zone is to ensure that the soil in the tunnel section and the middle of the horizontal and vertical reinforcement zones can also be reinforced, further increasing the integrity of the reinforced structure. The equal-thickness reinforcement pile 22 is away from the end of the vertical reinforcement pile 1 and the line connecting the center of the outer edge of the tunnel, forming an angle of 45° with the horizontal plane, and the reinforcement range along the tunnel line direction is about 6m before and after the center of the bridge pile foundation.
[0026] In the ultra-close side-penetrating single-pile reinforcement structure of the tunnel in the narrow space, the top surface of the vertical reinforcement pile 1 and the top surface of the horizontal reinforcement pile 2 are located in the same plane, and the top of the vertical reinforcement pile is located above the centroid of the tunnel, and the distance between the two is the sum of the tunnel radius and the thickness of the horizontal reinforcement pile, that is, R+s2 above the centroid of the tunnel (R is the tunnel radius); and the line connecting the bottom of the vertical reinforcement pile 1 and the center of the tunnel bottom forms an angle of 45° with the plumb line, and is located below the centroid of the tunnel, and the distance between the bottom of the vertical reinforcement pile and the centroid of the tunnel is equal to twice the radius of the tunnel, that is, 2R below the centroid of the tunnel.
[0027] like Figure 1-3As shown in the figure, tunnel 3 passes through the side of engineering pile 4. The area around engineering pile 4 and cap 5 is the vertical reinforcement area, and the area above the tunnel is the horizontal reinforcement area. Different MJS piles are set between each area. Among them, the first vertical pile and the second vertical pile in the vertical reinforcement area have different diameters. They are symmetrically constructed and set around the engineering piles to reinforce the soil around the engineering piles. After the vertical reinforcement area is constructed, the horizontal reinforcement area is constructed. The thickness of the horizontal reinforcement area should be greater than 3 meters. From the cross-section of the tunnel, the horizontal reinforcement area is connected to the vertical reinforcement area in the direction of the bridge pile, and the top is kept on the same horizontal plane with the vertical reinforcement area. The combination of the two constitutes a "Γ" type reinforcement structure. A row of horizontal transition piles is set at the connection between the horizontal reinforcement area of the tunnel and the vertical reinforcement area around the piles to ensure the bite and connection of the two reinforcement areas and increase the integrity of the structure; the horizontal reinforcement piles are constructed by skipping piles, and MJS construction is carried out in the order from close to the engineering piles to far away from the engineering piles.
[0028] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. A single pile reinforcement structure for ultra-close side penetration of a tunnel in a narrow space, characterized by: The invention comprises a plurality of vertical reinforcement piles (1) arranged around engineering piles to be protected, and horizontal reinforcement piles (2) arranged on the top of the tunnel and connected to the tops of the vertical reinforcement piles; the vertical reinforcement piles comprise a first vertical pile (11) and a second vertical pile (12) having a diameter smaller than that of the first vertical pile; the pile centers of the four first vertical piles are respectively arranged at the centers of the four sides of the cap; the four second vertical piles are respectively arranged between adjacent first vertical piles, and the second vertical piles and adjacent first vertical piles are interlocked with each other; the horizontal reinforcement piles comprise a horizontal transition pile (21) connecting the vertical reinforcement piles, and a reinforcement pile (22) of equal thickness connecting the horizontal transition piles, and the pile bodies of the horizontal reinforcement piles are interlocked with each other.
2. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 1 is characterized by: The center of the first vertical pile (11) is located not less than 0.2 m outside the cap.
3. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 2 is characterized by: Assume that the radius of the engineering pile is rp, the distance between the pile center of the first vertical pile and the cap is d1, the engagement depth between the first vertical pile and the engineering pile is d2, the cross-sectional shape of the load is a square with a side length of a, and the diameter R1 of the first vertical pile is: R1≥d1+d2+(a / 2-rp).
4. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 1 is characterized by: The engagement depth between the second vertical pile (12) and the first vertical pile (11) is 0.4 m.
5. The ultra-close side-through single pile reinforcement structure for a tunnel in a narrow space according to any one of claims 1 to 4, characterized in that: The top of the vertical reinforcement pile (1) is located above the centroid of the tunnel, and the distance between the top and the centroid is the sum of the radius of the tunnel and the thickness of the horizontal reinforcement pile (2).
6. The ultra-close side-through single pile reinforcement structure for a tunnel in a narrow space according to any one of claims 1 to 4, characterized in that: The line connecting the bottom of the vertical reinforcement pile (1) and the center of the tunnel bottom forms an angle of 45° with the plumb line.
7. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 6 is characterized by: The bottom of the vertical reinforcement pile (1) is located below the centroid of the tunnel, and the distance between the bottom of the vertical reinforcement pile and the centroid of the tunnel is equal to twice the radius of the tunnel.
8. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 1 is characterized by: The diameter of the horizontal reinforcement pile (2) is consistent with the diameter of the second vertical pile (12), and the reinforcement thickness of the horizontal reinforcement pile is greater than 3m.
9. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 1 or 8, characterized in that: The engagement depth between the pile bodies of the horizontal reinforcement piles (2) is 0.4 m.
10. The ultra-close side-through single pile reinforcement structure for tunnels in narrow spaces according to claim 1 or 8, characterized in that: A line connecting one end of the uniform thickness reinforcement pile (22) away from the vertical reinforcement pile (1) and the center of the outer edge of the tunnel forms an angle of 45° with the horizontal plane.