Device capable of actively controlling tunnel deformation

Abstract

The utility model provides a device capable of actively controlling tunnel deformation, which is characterized in that at least one reinforcement cage is placed in a drill hole between a tunnel structure and an underground diaphragm wall, concrete is poured to form a deformation control pile, and each reinforcement cage is a multi-section reinforcement cage which is sequentially connected from top to bottom; every two adjacent sections of reinforcement cages are connected through an active control device, each active control device is provided with a servo forcing device with an axial telescopic function, and each servo forcing device is connected with ground monitoring equipment through a signal line; downward pre-axial force is applied through the axial force application device, and the bottom reinforcement cage is driven to move downwards so as to overcome the upward buoyancy force. The deformation control pile is accurately controlled through the active control device, and the problem of tunnel vertical and lateral deformation caused during foundation pit engineering earth excavation is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction, concretely relates to a device with initiative control tunnel deformation. BACKGROUND

[0002] With the acceleration of urbanization and the decreasing of land resources, various buildings in cities begin to develop to underground space, and deep foundation pit projects in cities are more and more, and the foundation pit projects adjacent to existing tunnels and overpass existing tunnels are increasing. Under this working condition, the vertical and lateral displacement of the adjacent and underlying existing tunnels is easily caused during the excavation of the foundation pit project, which endangers the safety of the tunnel structure.

[0003] In the prior art, passive control measures such as increasing the stiffness of the enclosure system and reinforcing the soil at the pit bottom to reduce the lateral deformation of the enclosure structure and the rebound amount of the soil at the pit bottom are usually taken; the measures have relatively high cost, cannot realize active control, and have a great impact on the tunnel structure during construction. Therefore, in order to solve the above problems, it is urgent to provide a tunnel anti-floating device for solving the problem of vertical and lateral deformation of the tunnel caused during the earthwork excavation of the foundation pit project. SUMMARY

[0004] The utility model provides a device with initiative control tunnel deformation, at least one reinforcement cage is lowered in the drill hole between the tunnel structure and the underground continuous wall and the concrete is poured to form a deformation control pile, each reinforcement cage is a multi-section reinforcement cage connected in sequence from top to bottom, the adjacent two reinforcement cages are connected through an active control device, the active control device is provided with a servo force adding device with axial extension function, the servo force adding device is connected with the ground monitoring equipment through a signal line;

[0005] The axial force adding device is used to apply a pre-applied axial force to drive the pile body formed by the upper reinforcement cage or the lower reinforcement cage to move vertically to overcome the vertical displacement of the soil.

[0006] Further, the reinforcement cage is a two-section reinforcement cage, the active control device is connected between the upper reinforcement cage and the lower reinforcement cage.

[0007] The active control device is composed of an upper fixing part, a lower fixing part and a servo force adding device connected between the upper fixing part and the lower fixing part, the upper fixing part and the lower fixing part are fixedly connected with the upper reinforcement cage and the lower reinforcement cage respectively, the servo force adding device is composed of at least one self-balancing hydraulic jack, the self-balancing hydraulic jack is provided with a cylinder and a push rod in sealing sliding fit with the cylinder, the cylinder and the top part of the push rod are fixedly connected with the upper fixing part and the lower fixing part respectively.

[0008] Further, the upper fixing member and the lower fixing member are annular, and the servo force adding device is composed of a plurality of self-balancing hydraulic jacks annularly arranged between the upper fixing member and the lower fixing member.

[0009] Further, the upper fixing member and the lower fixing member are grating plates, and the servo force adding device is composed of one or more self-balancing hydraulic jacks uniformly arranged between the upper fixing member and the lower fixing member.

[0010] Further, the upper fixing member and the lower fixing member are steel plates, and the cylinder and the push rod top are respectively welded to the upper fixing member and the lower fixing member.

[0011] Further, the bottom of at least one segment of the steel reinforcement cage is fixedly connected with an anti-floating plate, and the anti-floating plate is provided with a plurality of through holes.

[0012] Further, a counterforce frame is further constructed on the top of the deformation control pile.

[0013] The deformation control pile has the advantages that:

[0014] The deformation control pile is accurately controlled by the active control device, and the problems of vertical and lateral deformation of the tunnel caused by the earthwork excavation of the foundation pit project are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description.

[0016] Figure 1 is a planar arrangement schematic view of the deformation control pile device in the first embodiment of the present application.

[0017] Figure 2 is Figure 1 A-A sectional view of.

[0018] Figure 3 is a detailed structural view of the deformation control pile device.

[0019] Figure 4is the plane arrangement schematic view of the deformation control pile device in the embodiment two of the utility model.

[0020] Figure 5 is the plane arrangement schematic view of the counterforce frame in the embodiment two of the utility model.

[0021] Figure 6 is Figure 5 B-B section view of. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious for those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, some technical features known in the art are not described to avoid confusion with the utility model.

[0023] In order to thoroughly understand the utility model, detailed steps and detailed structures will be proposed in the following description to explain the technical scheme of the utility model. The preferred embodiment of the utility model is described in detail as follows, however, in addition to these detailed descriptions, the utility model can have other implementation manners.

[0024] The utility model provides a kind of device with active control tunnel deformation, at least one reinforcement cage 6 is lowered in the borehole between tunnel structure and underground continuous wall 2 and is formed into deformation control pile 4 by pouring concrete.

[0025] Each reinforcement cage 6 is sequentially connected multiple section type reinforcement cage 6 up and down, and the adjacent two reinforcement cages 6 are connected by a active control device 5, and the active control device 5 is provided with servo force adding device 53 with axial telescopic function, and servo force adding device 53 is connected with ground monitoring equipment 10 by signal line.

[0026] Ground monitoring equipment 10 sends control signal to servo force adding device 53, and pre-axial force is applied to bottom reinforcement cage 6 by servo force adding device 53, and the pile body formed by upper reinforcement cage 61 or lower reinforcement cage 62 is vertically moved to overcome the vertical displacement of soil

[0027] In an optional embodiment, the steel reinforcement cage 6 is a two-section steel reinforcement cage 6, and an active control device 5 is connected between the upper steel reinforcement cage 61 and the lower steel reinforcement cage 62; the active control device 5 is composed of an upper fixing member 51, a lower fixing member 52, and a servo force adding device 53 connected between the upper fixing member 51 and the lower fixing member 52, the upper fixing member 51 and the lower fixing member 52 are fixedly connected with the upper steel reinforcement cage 61 and the lower steel reinforcement cage 62 respectively, and the servo force adding device 53 is composed of at least one self-balancing hydraulic jack, the self-balancing hydraulic jack is provided with a cylinder and a push rod in sealing sliding fit with the cylinder, and the cylinder and the top of the push rod are fixedly connected with the upper fixing member 51 and the lower fixing member 52 respectively.

[0028] In an optional embodiment, the upper fixing member 51 and the lower fixing member 52 are both annular steel plates, the bottom of the cylinder and the top of the push rod are welded to the upper fixing member 51 and the lower fixing member 52, and the servo force adding device 53 is composed of a plurality of self-balancing hydraulic jacks annularly mounted between the upper fixing member 51 and the lower fixing member 52, and the pre-axial force can be more stably and uniformly applied to the deformed control pile body through the cooperative work of the plurality of self-balancing hydraulic jacks, so as to ensure that the pile body is uniformly stressed when overcoming the vertical displacement and effectively prevent structural deformation or damage caused by uneven stress. In addition, the design of the annular steel plate not only enhances the stability of the structure, but also facilitates the firm welding connection with the steel reinforcement cage, thereby improving the safety and reliability of the entire device.

[0029] In an optional embodiment, the upper fixing member 51 and the lower fixing member 52 are both grid plates, and the servo force adding device 53 is composed of one or more self-balancing hydraulic jacks uniformly distributed between the upper fixing member 51 and the lower fixing member 52, and the grid plate can reduce the buoyancy.

[0030] In an optional embodiment, the bottom of at least one section of the steel reinforcement cage 6 is fixedly connected with an anti-floating plate, and the anti-floating plate is provided with a plurality of through holes, and the buoyancy of the steel reinforcement cage 6 can be reduced through the anti-floating plate.

[0031] Embodiment 1:

[0032] As shown in Figures 1-3 , this embodiment has one or more tunnels located on the upper part of the bottom of the foundation pit outside, and in specific implementation, the following steps are included:

[0033] 1) Position and construct the underground continuous wall 2.

[0034] 2) Construct the deformed control pile 4 at the predetermined position interval between the tunnel structure and the underground continuous wall 2, the deformed control pile 4 is formed by drilling equipment to form a hole, then lowering the steel reinforcement cage 6 and pouring concrete, one or more self-balancing jacks are arranged in the middle part of the steel reinforcement cage 6 to form the active control device 5, and the upper and lower ends of the self-balancing jack are fixed on the annular steel plate at the end of the steel reinforcement cage 6 through welding.

[0035] 3) Excavate earthwork, construct horizontal supports 3 and basement structure;

[0036] 4) During the excavation of the foundation pit, the unloading of soil causes vertical and lateral displacement of the soil around the tunnel. At this time, the active control device 5 is activated to apply pre-loaded axial force to the deformation control pile 4 to prevent the soil around the tunnel from sinking and causing vertical displacement of the tunnel structure. At the same time, the deformation control can be used as an isolation pile to reduce the horizontal displacement of the soil around the tunnel.

[0037] In addition, one or more rows of deformation control piles 4 are set according to calculations, and the spacing between each row of deformation control piles 4 is determined according to calculations; the pre-applied axial force value of the active control device 5 is dynamically adjusted according to the excavation depth of the foundation pit and the monitoring data of the monitoring equipment 10.

[0038] Example 2:

[0039] like Figures 1-3 As shown, this embodiment involves one or more tunnels located at the bottom of the foundation pit. The specific implementation includes the following steps:

[0040] 1) Locate and construct the diaphragm wall 2.

[0041] 2) Deformation control piles 4 are constructed at predetermined intervals on both sides of the tunnel structure or between two tunnels in the pit. The deformation control piles 4 are formed by drilling equipment, lowering a steel cage 6 and pouring concrete. One or more self-balancing jacks are set in the middle of the steel cage 6 to form an active control device 5. The upper and lower ends of the self-balancing jacks are fixed to the annular steel plates at the ends of the steel cage 6 by welding.

[0042] 3) A reaction frame 7 is set above the deformation control pile 4. The reaction frame 7 is composed of several longitudinal 9 and several transverse 8 reaction beams. The two ends of the reaction frame 7 can be fixedly connected to the retaining structure 2, and counterweight components can also be placed on the reaction frame 7. The reaction frame 7 can be assembled from steel or be a cast-in-place concrete structure.

[0043] 4) Excavate earthwork, construct horizontal supports 3 and basement structure.

[0044] 5) During the excavation of the foundation pit, the soil around the tunnel floats and shifts laterally due to the unloading of the soil. At this time, the self-balancing jacks 5 are activated to pre-apply axial force to the lower part of the deformation control piles 4 to prevent the soil around the tunnel from floating and causing vertical displacement of the tunnel structure. At the same time, the deformation control piles can be used as isolation piles to reduce the horizontal displacement of the soil around the tunnel.

[0045] In addition, deformation control piles 4 can be selected to be set on one or both sides of the tunnel or in the middle of the two tunnels according to calculations. One or several rows can be set on each side, and the pile spacing of each row of deformation control piles 4 is determined according to calculations. The pre-loaded axial force value of the self-balancing jack 5 is dynamically adjusted according to the excavation depth of the foundation pit and the monitoring data of the monitoring equipment 10.

[0046] In summary, excavation and construction level support and basement structure are the key links in the whole deformation control pile construction process. Through fine soil excavation operation, the stability and safety of the foundation pit are ensured, and at the same time, the effective setting of the horizontal support can further reinforce the foundation pit structure and prevent the deformation of the foundation pit. The construction of the basement structure is carried out according to the design requirements, to ensure its coordination and functionality with the whole deformation control pile system. After the subsection steel reinforcement cage is lowered, the pre-axial force is applied to the deformation control pile through the active control device, driving the pile body formed by the upper steel reinforcement cage 61 or the lower steel reinforcement cage 62 to move vertically to overcome the vertical displacement of the soil body, so as to prevent the vertical displacement of the soil body around the tunnel from causing the vertical deformation of the tunnel structure. Through the smooth implementation of the above steps, a solid foundation is laid for the subsequent pre-axial force of the deformation control pile and the protection of the tunnel.

[0047] The preferred embodiments of the utility model are described above. It should be understood that the utility model is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the utility model or modify them into equivalent embodiments with equivalent changes without departing from the scope of the technical solutions of the utility model, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, as long as it does not depart from the content of the technical solutions of the utility model, still belongs to the scope of protection of the technical solutions of the utility model.

Claims

1. A device for actively controlling tunnel deformation, comprising placing at least one reinforcing cage (6) in a borehole between the tunnel structure and the underground continuous wall (2) and pouring concrete to form a deformation control pile (4), characterized in that, Each of the steel cages (6) is a multi-segment steel cage (6) connected vertically. Adjacent steel cages (6) are connected by an active control device (5). The active control device (5) is equipped with a servo force-adding device (53) with axial extension function. The servo force-adding device (53) is connected to the ground monitoring equipment (10) through a signal line. The servo-assisted force application device applies a pre-applied axial force, which drives the pile body formed by the upper steel cage (61) or the lower steel cage (62) to move vertically to overcome the vertical displacement of the soil.

2. The device for actively controlling tunnel deformation as described in claim 1, characterized in that, The steel cage (6) is a two-section steel cage (6) with the upper steel cage (61) and the lower steel cage (62) connected by the active control device (5). The active control device (5) consists of an upper fixing member (51), a lower fixing member (52), and a servo force-applying device (53) connected between the upper fixing member (51) and the lower fixing member (52). The upper fixing member (51) and the lower fixing member (52) are fixedly connected to the upper steel cage (61) and the lower steel cage (62), respectively. The servo force-applying device (53) consists of at least one self-balancing hydraulic jack. The self-balancing hydraulic jack is provided with a cylinder and a push rod that is sealed and slidably engaged with the cylinder. The top of the cylinder and the push rod are fixedly connected to the upper fixing member (51) and the lower fixing member (52), respectively.

3. The device for actively controlling tunnel deformation as described in claim 2, characterized in that, Both the upper fixing member (51) and the lower fixing member (52) are ring-shaped, and the servo force-applying device (53) is composed of several self-balancing hydraulic jacks that are installed in a ring between the upper fixing member (51) and the lower fixing member (52).

4. The device for actively controlling tunnel deformation as described in claim 2, characterized in that, Both the upper fixing member (51) and the lower fixing member (52) are grating plates, and the servo force application device (53) consists of one or more self-balancing hydraulic jacks evenly distributed between the upper fixing member (51) and the lower fixing member (52).

5. A device for actively controlling tunnel deformation as described in claim 2 or 3, characterized in that, Both the upper fixing member (51) and the lower fixing member (52) are steel plates, and the cylinder and the top of the push rod are welded to the upper fixing member (51) and the lower fixing member (52) respectively.

6. The device for actively controlling tunnel deformation as described in claim 1, characterized in that, At least one section of the steel cage (6) is fixedly connected to an anti-buoyancy plate at its bottom, and the anti-buoyancy plate is provided with several through holes.

7. The device for actively controlling tunnel deformation as described in claim 1, characterized in that, A reaction frame (7) is also constructed on top of the deformation control pile (4).

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