Foundation underpinning structure of underground power pipe gallery and construction method of foundation underpinning structure

Abstract

The invention provides a foundation underpinning structure of an underground power pipe gallery and a construction method of the foundation underpinning structure. The foundation underpinning structure comprises fender posts, longitudinal beam components and an underpinning mechanism. The underpinning mechanism comprises a lower section steel beam component, a vertical force measuring point, an upper section steel beam component and a connecting assembly. The fender posts, the longitudinal beam components, the lower section steel beam components, the upper section steel beam components and the connecting assemblies are combined to form a pull-up and lift-down foundation underpinning structure for the underground electric power pipe gallery, the bearing capacity is high, the stress structure is clear in stress, and the self-weight requirement of the large underground electric power pipe gallery is met; according to monitoring data fed back by vertical force measuring points at different positions, the corresponding connecting assemblies can be adjusted in real time to stretch out and draw back so as to adjust stress of the lower section steel beam component and the upper section steel beam component, it is ensured that the underground power pipe gallery is evenly stressed, deformation control precision is high, deformation of the underground power pipe gallery is conveniently controlled within an allowable range, and the safety of the underground power pipe gallery is improved. And the operation safety of the pipe gallery during construction is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering construction, in particular to a foundation underpinning structure of an underground power pipe gallery and a construction method thereof. BACKGROUND

[0002] In order to improve the municipal road traffic service level of the old urban area, due to the dense buildings on the ground, when solving the traffic congestion condition of the old urban area, the underground road is often used. The underground road often needs to use the open excavation or cover excavation method to construct the underground road open tunnel section structure. When the open excavation or cover excavation method is used to construct the underground road structure, the influence on the underground pipeline is large. In order to reduce the influence on the existing underground pipeline, especially the underground power pipe gallery, the protection of the existing underground pipeline during the construction of the open excavation or cover excavation method needs to be done well. The underground power pipe gallery is generally a foundation with compacted soil or rock layer as the bearing layer. When the underground power pipe gallery is suspended, a special structure needs to be used for foundation underpinning or structural measures need to be taken for protection.

[0003] The common foundation underpinning method for the suspended underground power pipe gallery during construction is usually the method of suspending the steel beam to set the hanging point for hoisting. The weight of the pipeline is transmitted to the steel beam through the hanging point, and the steel beam transmits the weight to the stable foundation. This scheme can be used for the temporary suspension protection of the underground pipeline with small diameter. For the large underground power pipe gallery which cannot be moved or changed, the following defects exist: first, the underground power pipe gallery uses a reinforced concrete structure, and the self-weight is large. The bearing capacity of the existing suspension underpinning structure is difficult to meet the requirements; second, the underground power pipe gallery is very sensitive to deformation. The transmission path of the existing scheme is not clear, the deformation control effect is poor, and the pipe gallery structure is easily cracked; third, the plane layout data of the underground power pipe gallery in the old urban area is often incomplete. The existing underpinning structure is difficult to adapt to the complex layout, and the protection failure or damage to the pipe gallery structure is easily caused.

[0004] Therefore, a foundation underpinning structure of an underground power pipe gallery with strong bearing capacity, clear structure stress and high deformation control precision and a construction method thereof are needed to solve the problems in the prior art and ensure the safe operation of the existing underground power pipe gallery during the construction of the underground road. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a foundation underpinning structure of an underground power pipe gallery and a construction method thereof, which can achieve the technical effects of strong bearing capacity, clear structure stress and high deformation control precision.

[0006] A foundation underpinning structure of an underground power pipe gallery, comprising: a surrounding pile arranged around the existing underground power pipe gallery; a longitudinal beam member arranged on both sides of the underground power pipe gallery along the layout of the underground power pipe gallery and connected with the surrounding pile; and The underpinning mechanism is provided with multiple groups along the underground power pipeline gallery, and comprises a lower steel beam component, a vertical force measuring point, an upper steel beam component and a connecting assembly. The lower steel beam component is arranged at the bottom of the underground power pipeline gallery and connected with the longitudinal beam component. The vertical force measuring point is arranged at the position where the lower steel beam component contacts with the underground power pipeline gallery. The upper steel beam component is arranged above the underground power pipeline gallery corresponding to the lower steel beam component and connected with the longitudinal beam component. The connecting assembly connects the lower steel beam component and the upper steel beam component and can adjust the stress of the lower steel beam component and the upper steel beam component.

[0007] In one of the embodiments, the lower steel beam component comprises a lower steel beam main component. The lower steel beam main component is arranged at the bottom of the underground power pipeline gallery and connected with the longitudinal beam component at both ends. The vertical force measuring point is arranged at the position where the lower steel beam main component contacts with the underground power pipeline gallery.

[0008] In one of the embodiments, the lower steel beam main component is provided with multiple groups of shear-resistant nails in the longitudinal beam component at both ends and the circumferential side.

[0009] In one of the embodiments, the lower steel beam main component is provided with anti-sliding end plates in the longitudinal beam component at both ends.

[0010] In one of the embodiments, the connecting assembly comprises a connecting piece, a fixed-end anchor and a movable-end anchor. The bottom end of the connecting piece is connected with the lower steel beam component through the fixed-end anchor, and the top end is slidably connected with the upper steel beam component through the movable-end anchor.

[0011] In one of the embodiments, the fixed-end anchor comprises a fixed-end U-shaped anchor steel plate and a locking steel plate. The fixed-end U-shaped anchor steel plate is sleeved at the bottom of the lower steel beam component, and the bottom end of the connecting piece penetrates through the fixed-end U-shaped anchor steel plate and is connected with the locking steel plate.

[0012] In one of the embodiments, the movable-end anchor comprises a movable-end U-shaped anchor steel plate and an adjusting nut. The movable-end U-shaped anchor steel plate is sleeved at the top of the upper steel beam component, and the top end of the connecting piece penetrates through the movable-end U-shaped anchor steel plate and is threadedly connected with the adjusting nut.

[0013] A foundation underpinning construction method of an underground power pipeline gallery, which adopts the above-mentioned foundation underpinning structure of the underground power pipeline gallery, and comprises the following steps: The enclosure pile of the underground road structure is constructed; The underground power pipeline gallery is segmented and excavated, the lower steel beam component is constructed, and the vertical force measuring point is installed; Pouring the longitudinal beam member connecting the lower profile steel beam member on both sides of the underground power pipe gallery; Pouring the upper profile steel beam member connected with the longitudinal beam member above the underground power pipe gallery; Connecting the lower profile steel beam member and the upper profile steel beam member through the connecting assembly.

[0014] In one of the embodiments, the surrounding piles of the underground road structure are constructed after the excavation along the periphery of the underground power pipe gallery is performed until the top plate and the side wall profile of the underground power pipe gallery are exposed to show the specific direction of the underground power pipe gallery.

[0015] In one of the embodiments, the longitudinal beam member is poured along the direction of the underground power pipe gallery and connected with the surrounding piles.

[0016] The underground power pipe gallery foundation underpinning structure and the construction method thereof have at least the following beneficial effects: 1. The underground power pipe gallery is formed into an upper-lifting and lower-lifting foundation underpinning structure by the combination of the surrounding piles, the longitudinal beam member, the lower profile steel beam member, the upper profile steel beam member and the connecting assembly, which has strong bearing capacity and clear stress structure, and meets the self-weight requirement of the large underground power pipe gallery.

[0017] 2. The corresponding connecting assembly can be adjusted in extension and contraction in real time according to the monitoring data fed back by the vertical force measuring points at different positions to adjust the stress of the lower profile steel beam member and the upper profile steel beam member, so as to ensure the uniform stress of the underground power pipe gallery and high deformation control precision, facilitate the control of the deformation of the underground power pipe gallery within the allowable range, and ensure the operation safety of the pipe gallery during construction. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application, the drawings required to be used in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 A front view of a foundation underpinning structure of an underground power pipe gallery according to an embodiment of the present application is shown in the figure; Figure 2 A top view of a foundation underpinning structure of an underground power pipe gallery according to an embodiment of the present application is shown in the figure; Figure 1 A sectional view of a foundation underpinning structure of an underground power pipe gallery according to an embodiment of the present application is shown in the figure; Figure 3 Figure 1 A structure schematic view of the fixed end anchoring member in a foundation underpinning structure of an underground power pipe gallery according to an embodiment of the present application is shown in the figure; Figure 4 A structure schematic view of the fixed end anchoring member in a foundation underpinning structure of an underground power pipe gallery according to an embodiment of the present application is shown in the figure; Figure 1 Figure 5 ​​For Figure 1 Fig. 2 is a structural schematic diagram of two directions of an active end anchor in a foundation underpinning structure of an underground power pipe gallery shown in Fig. 1.

[0020] Reference signs: 1, fender pile; 2, lower profile steel beam component; 2-1, lower profile steel beam main component; 2-2, shear nail; 2-3, anti-skid end plate; 3, longitudinal beam component; 4, upper profile steel beam component; 5, fixed end anchor; 5-1, fixed end U-shaped anchor steel plate; 5-2, locking steel plate; 6, connecting piece; 7, active end anchor; 7-1, active end U-shaped anchor steel plate; 7-2, adjusting nut; 8, vertical force measuring point; 10, underground power pipe gallery. DETAILED DESCRIPTION

[0021] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0022] Please refer to Figures 1 to 3 , a foundation underpinning structure of an underground power pipe gallery in an embodiment, comprising fender piles 1, longitudinal beam components 3 and underpinning mechanisms. Among them, the fender piles 1 are arranged around the existing underground power pipe gallery 10. The longitudinal beam components 3 are arranged on both sides of the underground power pipe gallery 10 along the direction of the underground power pipe gallery 10, and are connected with the fender piles 1. The underpinning mechanisms are arranged in multiple groups along the direction of the underground power pipe gallery 10, and the underpinning mechanism comprises a lower profile steel beam component 2, a vertical force measuring point 8, an upper profile steel beam component 4 and a connecting assembly. The lower profile steel beam component 2 is arranged at the bottom of the underground power pipe gallery 10 and is connected with the longitudinal beam component 3; the vertical force measuring point 8 is arranged at the position where the lower profile steel beam component 2 contacts the underground power pipe gallery 10; the upper profile steel beam component 4 is arranged above the underground power pipe gallery 10 corresponding to the lower profile steel beam component 2 and is connected with the longitudinal beam component 3; the connecting assembly connects the lower profile steel beam component 2 and the upper profile steel beam component 4, and can adjust the stress of the lower profile steel beam component 2 and the upper profile steel beam component 4.

[0023] Further, the lower profile steel beam component 2 comprises a lower profile steel beam main component 2-1; the lower profile steel beam main component 2-1 is arranged at the bottom of the underground power pipe gallery 10 and is connected with the longitudinal beam components 3 at both ends and both sides, and the vertical force measuring point 8 is arranged at the position where the lower profile steel beam main component 2-1 contacts the underground power pipe gallery 10.

[0024] In the above embodiment, the surrounding pile 1, the longitudinal beam member 3, the lower profile steel beam member 2, the upper profile steel beam member 4 and the connecting assembly are combined to form an upper-lifting and lower-lifting foundation replacement structure for the underground electric power pipe gallery 10, which has strong bearing capacity, clear stress structure and meets the self-weight requirements of the large underground electric power pipe gallery 10. According to the monitoring data fed back by the vertical force measuring points 8 at different positions, the corresponding connecting assembly can be adjusted in real time to adjust the stress of the lower profile steel beam member 2 and the upper profile steel beam member 4, so as to ensure that the underground electric power pipe gallery 10 is uniformly stressed and has high deformation control precision, which facilitates the control of the deformation of the underground electric power pipe gallery 10 within the allowable range and ensures the operation safety of the pipe gallery during construction.

[0025] In the above embodiment, the connecting assembly is symmetrically provided with two groups relative to the underground electric power pipe gallery 10. The symmetric arrangement can uniformly transmit the upper-lifting and lower-lifting force to the underground electric power pipe gallery 10, improve the overall structure's anti-overturning performance and stiffness, and cooperate with the monitoring data of the vertical force measuring points 8 to synchronously or selectively adjust the extension and contraction of the connecting assemblies on both sides, so that the underground electric power pipe gallery 10 is more uniformly deformed up and down and left and right, and the deformation is further controlled within the allowable range.

[0026] Please refer to Figure 3 and Figure 4 In an embodiment, the lower profile steel beam main member 2-1 is provided with a plurality of shear nails 2-2 in the longitudinal beam member 3 at both ends of the circumferential side. The connection between the lower profile steel beam main member 2-1 and the longitudinal beam member 3 is enhanced, the relative sliding between the two is prevented, and the shear capacity of the structure is improved.

[0027] Please refer to Figure 3 and Figure 4 In an embodiment, the lower profile steel beam main member 2-1 is provided with an anti-slip end plate 2-3 in the longitudinal beam member 3 at both ends. The anti-slip end plate 2-3 further strengthens the fixing effect, avoids displacement of the end of the lower profile steel beam main member 2-1 under stress, and ensures the stability of the overall structure.

[0028] Please refer to the figure. In an embodiment, the connecting assembly includes a connecting piece 6, a fixed end anchor 5 and a movable end anchor 7; the bottom end of the connecting piece 6 is connected to the lower profile steel beam member 2 through the fixed end anchor 5, and the top end is slidably connected to the upper profile steel beam member 4 through the movable end anchor 7.

[0029] Specifically, the fixed end anchor 5 includes a fixed end U-shaped anchor steel plate 5-1 and a locking steel plate 5-2; the fixed end U-shaped anchor steel plate 5-1 is sleeved on the bottom of the lower profile steel beam member 2, and the bottom end of the connecting piece 6 penetrates the fixed end U-shaped anchor steel plate 5-1 and is connected to the locking steel plate 5-2. The movable end anchor 7 includes a movable end U-shaped anchor steel plate 7-1 and an adjusting nut 7-2; the movable end U-shaped anchor steel plate 7-1 is sleeved on the top of the upper profile steel beam member 4, and the top end of the connecting piece 6 penetrates the movable end U-shaped anchor steel plate 7-1 and is threadedly connected to the adjusting nut 7-2.

[0030] In the above embodiment, the contact area of the bottom connection can be increased by the cooperation of the fixed-end U-shaped anchoring steel plate 5-1 and the locking steel plate 5-2, so as to ensure that the connecting piece 6 is firmly attached to the lower steel beam member 2. The contact area of the top connection can be increased by the cooperation of the movable-end U-shaped anchoring steel plate 7-1 and the adjusting nut 7-2, so as to ensure that the connecting piece 6 is firmly attached to the upper steel beam member 4. The stress of the lower steel beam member 2 and the upper steel beam member 4 can be adjusted by rotating the adjusting nut 7-2, which is convenient and labor-saving.

[0031] In the above embodiment, the connecting piece 6 is provided with two groups in opposite positions. The stress balance and structural stability are further improved, and the adjustment flexibility is optimized.

[0032] On the other hand, the application also provides a foundation underpinning construction method for an underground electric power pipe gallery, which adopts the above-mentioned foundation underpinning structure for the underground electric power pipe gallery. The construction scheme comprises the following steps: The enclosure pile 1 for the underground road structure is constructed; The underground electric power pipe gallery 10 is segmented and excavated, the lower steel beam member 2 is constructed, and the vertical force measuring point 8 is installed; The longitudinal beam member 3 connected with the lower steel beam member 2 is poured on both sides of the underground electric power pipe gallery 10; The upper steel beam member 4 connected with the longitudinal beam member 3 is installed above the underground electric power pipe gallery 10; The lower steel beam member 2 and the upper steel beam member 4 are connected by the connecting assembly.

[0033] The above construction method uses the longitudinal beam member 3 as a vertical force transmission fulcrum, and uses the lower steel beam member 2, the upper steel beam member 4 and the connecting assembly as direct force transmission members. The force transmission of the entire foundation underpinning structure is clear, the construction step sequence is simple, the disturbance during construction is small, and the method can be used as a foundation underpinning structure method for the underground electric power pipe gallery 10 which is sensitive to deformation.

[0034] Further, the enclosure pile 1 for the underground road structure is constructed after the underground electric power pipe gallery 10 is symmetrically excavated along the periphery until the top plate and the side wall profile of the underground electric power pipe gallery 10 are exposed, and the specific direction of the underground electric power pipe gallery 10 is displayed. The longitudinal beam member 3 is poured along the direction of the underground electric power pipe gallery 10 and connected with the enclosure pile 1.

[0035] The construction method can be laid according to the actual direction of the underground power pipe gallery 10, and will not cause damage or failure of the protection of the underground power pipe gallery 10 structure due to unknown plane direction data of the underground power pipe gallery 10. The profile of the underground power pipe gallery 10 is exposed by symmetrical excavation before the fender pile 1 is constructed, ensuring accurate positioning of the fender pile 1 and avoiding conflicts with the existing underground power pipe gallery 10, improving construction safety. The segmented jump excavation process reduces disturbance to the surrounding soil of the underground power pipe gallery 10 and reduces the risk of collapse. At the same time, it is suitable for narrow construction space scenarios. The longitudinal beam member 3 is poured along the direction of the underground power pipe gallery 10 and connected to the fender pile 1, forming a continuous force system that transmits dispersed load to the fender pile 1, further improving the overall load-carrying capacity of the structure.

[0036] Further, the lower steel beam member 2 and the upper steel beam member 4 are manufactured to standard length in the factory. This facilitates transportation to the site for assembly and construction, improving construction efficiency.

[0037] The specific embodiments of the underground power pipe gallery foundation replacement structure and the construction method thereof are as follows: First, symmetrical excavation is performed along the periphery of the underground power pipe gallery 10 until the top plate and side wall profile of the underground power pipe gallery 10 are exposed. After the specific direction of the underground power pipe gallery 10 is displayed, the fender pile 1 of the underground road structure is constructed.

[0038] When the fender pile 1 structure is formed, the underground power pipe gallery 10 is segmented and jump excavated, the lower steel beam member 2 of the underground power pipe gallery 10 is constructed, and the vertical force measuring point 8 is installed at the contact position of the lower steel beam member 2 and the underground power pipe gallery 10, facilitating later monitoring of the stress of a single lower steel beam member 2.

[0039] When the lower steel beam member 2 is constructed, the longitudinal beam member 3 connecting the lower steel beam member 2 and the fender pile 1 is poured along the direction of the underground power pipe gallery 10 on both sides of the underground power pipe gallery 10. The upper steel beam member 4 is constructed above the underground power pipe gallery 10 and the ends of the upper steel beam member 4 are connected to the longitudinal beam member 3.

[0040] When the upper steel beam member 4 is constructed, the fixed end anchor 5 and the movable end anchor 7 are installed. Specifically, the fixed end U-shaped anchor steel plate 5-1 is installed on the lower steel beam member 2, the movable end U-shaped anchor steel plate 7-1 is installed on the upper steel beam member 4, then the bottom end of the connecting piece 6 is fixed through the fixed end U-shaped anchor steel plate 5-1 with a locking steel plate, and the top end of the connecting piece 6 is connected to the adjusting nut 7-2 through the movable end U-shaped anchor steel plate 7-1.

[0041] The underground electric power pipe gallery 10 is formed into an upper-lifting and lower-lifting foundation replacement structure by the combination of the enclosure pile 1, the longitudinal beam member 3, the lower profile steel beam member 2, the upper profile steel beam member 4 and the connecting piece 6, the bearing capacity of which is strong, the stress structure of which is clear, and the self-weight requirement of the large underground electric power pipe gallery 10 is met; according to the monitoring data fed back by the vertical force measuring point 8, the adjusting nut 7-2 is adjusted in real time to adjust the stress of the lower profile steel beam member 2 and the upper profile steel beam member 4, so that the stress of the underground electric power pipe gallery 10 is uniform, the deformation control precision is high, the deformation of the underground electric power pipe gallery 10 is controlled within the allowable range, and the operation safety of the pipe gallery during construction is ensured.

[0042] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A foundation underpinning structure for an underground power tunnel, characterized by, Comprise: Fender pile (1), laid in the existing underground power pipe gallery (10) periphery; Longitudinal beam member (3), along the underground power pipe gallery (10) trend is laid in both sides, and with the fender pile (1) connection; And Underpinning mechanism, along the underground power pipe gallery (10) trend is provided with multiple groups, the underpinning mechanism includes lower profile steel beam member (2), vertical force measuring point (8), upper profile steel beam member (4) and connecting assembly, the lower profile steel beam member (2) is set in the underground power pipe gallery (10) bottom, and with the longitudinal beam member (3) connection;The vertical force measuring point (8) is set in the lower profile steel beam member (2) and the underground power pipe gallery (10) contact position;The upper profile steel beam member (4) is correspondingly set in the underground power pipe gallery (10) above the lower profile steel beam member (2), and is connected with the longitudinal beam member (3);The connecting assembly connects the lower profile steel beam member (2) and the upper profile steel beam member (4), and the stress of the lower profile steel beam member (2) and the upper profile steel beam member (4) can be adjusted.

2. The foundation underpinning structure for an underground power conduit tunnel according to claim 1, wherein, The lower profile steel beam member (2) includes lower profile steel beam main member (2-1);The lower profile steel beam main member (2-1) is set in the underground power pipe gallery (10) bottom, and both ends are connected with the longitudinal beam member (3) on both sides, and the vertical force measuring point (8) is set in the lower profile steel beam main member (2-1) and the underground power pipe gallery (10) contact position.

3. The foundation underpinning structure for an underground power conduit tunnel of claim 2, wherein, The lower profile steel beam main member (2-1) both ends are provided with multiple groups of shear nails (2-2) in the longitudinal beam member (3).

4. The foundation underpinning structure for an underground power conduit tunnel of claim 2, wherein, The lower profile steel beam main member (2-1) both ends are provided with anti-skid end plate (2-3) in the longitudinal beam member (3).

5. The foundation underpinning structure for an underground power conduit tunnel of claim 1, wherein, The connecting assembly includes connecting piece (6), fixed end anchor (5) and movable end anchor (7);The bottom end of the connecting piece (6) is connected with the lower profile steel beam member (2) through the fixed end anchor (5), and the top end is slidably connected with the upper profile steel beam member (4) through the movable end anchor (7).

6. The foundation underpinning structure for an underground power tunnel of claim 5, wherein, The fixed end anchor (5) includes fixed end U-shaped anchor steel plate (5-1) and locking steel plate (5-2);The fixed end U-shaped anchor steel plate (5-1) is sleeved on the bottom of the lower profile steel beam member (2), and the bottom end of the connecting piece (6) penetrates the fixed end U-shaped anchor steel plate (5-1) and is connected with the locking steel plate (5-2).

7. The foundation underpinning structure for an underground power tunnel of claim 5, wherein, The movable end anchor (7) includes movable end U-shaped anchor steel plate (7-1) and adjusting nut (7-2), the movable end U-shaped anchor steel plate (7-1) is sleeved on the top of the upper profile steel beam member (4), and the top end of the connecting piece (6) penetrates the movable end U-shaped anchor steel plate (7-1) and is threadedly connected with the adjusting nut (7-2).

8. A method for ground replacement construction of an underground electric power conduit gallery, using the ground replacement structure of the underground electric power conduit gallery according to any one of claims 1 to 7, characterized by, Comprise the following steps: The fender pile (1) of the underground road structure is applied; Along the underground power pipe gallery (10) section jump groove, the lower profile steel beam member (2) is applied, and the vertical force measuring point (8) is installed; Pouring the longitudinal beam member (3) connecting the lower profile steel beam member (2) on both sides of the underground power pipe gallery (10); Mounting the upper profile steel beam member (4) connected with the longitudinal beam member (3) above the underground power pipe gallery (10); Connecting the lower profile steel beam member (2) and the upper profile steel beam member (4) through the connecting assembly.

9. The method of foundation underpinning of an underground power tunnel according to claim 8, characterized in that, Excavating symmetrically along the periphery of the underground power pipe gallery (10) until the top plate and side wall contour of the underground power pipe gallery (10) are exposed to show the specific direction of the underground power pipe gallery (10) and then pouring the enclosure pile (1) of the underground road structure.

10. The method of foundation underpinning for an underground power tunnel of claim 8, wherein, Pouring the longitudinal beam member (3) along the direction of the underground power pipe gallery (10) and connecting it with the enclosure pile (1).

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