Enclosure supporting system of underground structure reconstruction and extension foundation pit

Abstract

The utility model relates to an enclosure supporting system of an underground structure reconstruction and extension foundation pit, which is used for providing support for a reconstruction and extension tunnel foundation pit of an existing tunnel structure. The existing tunnel structure comprises an existing tunnel top plate close to one side of the earth surface, an existing tunnel bottom plate far away from one side of the earth surface and a tunnel side wall to be chiseled and removed corresponding to a reconstructed and expanded tunnel foundation pit; the enclosure supporting system comprises an underpass foundation pit enclosure, a first support and a second support. The tunnel foundation pit support is arranged on the outer side of the reconstructed and expanded tunnel foundation pit; one end of the first support is fixedly connected with an existing tunnel top plate, and the other end of the first support is fixedly connected to a tunnel foundation pit support. One end of the second support is fixedly connected to the tunnel foundation pit support, and the other end of the second support is connected with and transmits force to an existing tunnel bottom plate. Compared with the prior art, the utility model provides a newly-built tunnel foundation pit support structure and an inner support force transmission path, so that the stress problem of the support structure is solved, and the traffic operation of the existing tunnel during the construction period is not influenced.

Description

Technical Field

[0001] The utility model relates to the field of underground structure construction, in particular to a reconstruction and expansion structure of an existing operating tunnel. Background Art

[0002] With the development of society and the economy, people's demand for air travel is increasing, making airport expansion and capacity expansion particularly urgent. Existing airports generally have access tunnels running through them. Terminal expansion requires maintaining the normal operation of these tunnels to meet airport transportation needs. Therefore, during terminal construction, these access tunnels need to be rerouted for uninterrupted operation.

[0003] Traffic diversion in underground passages requires the removal of existing tunnel side wall structures. Normally, the maximum width of the underground structure opening is no more than 15m. In order to meet the connection and diversion of the existing three-lane road, the maximum width of the side wall opening to be removed is about 60m, which greatly exceeds the conventional practice of underground structure renovation and expansion. The document "Integrated Renovation Design of Existing Separated Tunnels" proposes an integrated renovation design scheme. However, this renovation design scheme requires the closure of underground traffic, and the entire tunnel operation will be interrupted during the implementation of the project, which will put considerable pressure on ground traffic. One side of the renovation and expansion foundation pit is close to the existing tunnel structure, and the shape and structure of the connecting part of the foundation pit enclosure are irregular. Conventional internal support structures of the enclosure are difficult to apply and cannot provide effective support without affecting the traffic operation in the existing tunnel.

[0004] Based on this situation, how to provide a retaining support system that can not only solve the retaining support problem of underground passage reconstruction and expansion, but also meet the demand for uninterrupted operation of underground traffic during construction is a technical problem that needs to be solved urgently. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide a support system for the foundation pit of the underground structure renovation and expansion.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A support system for a foundation pit for renovation and expansion of an underground structure, used to provide support for a foundation pit for renovation and expansion of an existing tunnel structure, wherein the existing tunnel structure includes an existing tunnel top plate on a side close to the ground surface, an existing tunnel bottom plate on a side away from the ground surface, and a tunnel side wall to be removed corresponding to the foundation pit for renovation and expansion of the tunnel;

[0008] The retaining support system includes a tunnel foundation pit retaining, a first support and a second support; the tunnel foundation pit retaining is arranged on the outside of the tunnel foundation pit; one end of the first support is connected and fixed to the existing tunnel top plate, and the other end is connected and fixed to the tunnel foundation pit retaining; one end of the second support is connected and fixed to the tunnel foundation pit retaining, and the other end is connected and fixed to the existing tunnel bottom plate.

[0009] As a preferred technical solution, the first support is arranged perpendicular to the existing tunnel structure.

[0010] As an optimal technical solution, a first force-transmitting corbel corresponding to the first support is provided on the existing tunnel roof, and the first support is fixedly connected to the existing tunnel roof via the first force-transmitting corbel.

[0011] As a preferred technical solution, the first support is a reinforced concrete support.

[0012] As a preferred technical solution, the second support is arranged perpendicular to the existing tunnel structure.

[0013] As a preferred technical solution, a second force-transmitting corbel corresponding to the second support is provided on the existing tunnel floor, and the second support is fixedly connected to the existing tunnel floor through the second force-transmitting corbel.

[0014] As a preferred technical solution, an opening corresponding to the second steel support is opened on the side wall of the tunnel to be excavated, and the second steel support is set through the side wall of the tunnel to be excavated.

[0015] As an optimal technical solution, the second support is a two-section support structure; wherein, the first section of the support connects the tunnel foundation pit enclosure and one side of the tunnel side wall to be removed, and the second section of the support connects the other side of the tunnel side wall to be removed corresponding to the first section of the support and the existing tunnel floor.

[0016] As a preferred technical solution, the second support is a steel support.

[0017] As a preferred technical solution, the enclosure support structure further includes temporary steel columns; the temporary steel columns are arranged along the side walls of the tunnel to be excavated.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a new tunnel foundation pit retaining structure and an internal support force transmission path by arranging force transmission brackets above the existing tunnel structure top plate and above the existing tunnel bottom plate, and then connecting and supporting the tunnel foundation pit enclosure through two supports respectively, thereby solving the force problem of the enclosure structure and not affecting the existing tunnel traffic operation during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a support system for a foundation pit for renovation and expansion of an underground structure according to the present invention;

[0021] Figure 2 This is the first support plan layout of the tunnel foundation pit for renovation and expansion of this utility model;

[0022] Figure 3 This is the second support plan layout of the tunnel foundation pit for renovation and expansion of this utility model;

[0023] Figure 4 This is a schematic diagram of the construction process of the tunnel foundation pit for renovation and expansion of the present utility model;

[0024] Figure 5 This is a schematic diagram of the second construction process of the tunnel foundation pit renovation and expansion of the present utility model;

[0025] Figure 6 This is a schematic diagram of the third construction process of the tunnel foundation pit renovation and expansion of the present utility model;

[0026] Figure 7 This is a schematic diagram of the fourth construction process of the tunnel foundation pit renovation and expansion of the present utility model;

[0027] Figure 8 This is a schematic diagram of the fifth construction process of the tunnel foundation pit renovation and expansion of the present utility model;

[0028] Figure 9 This is a schematic diagram of the sixth construction process of the tunnel foundation pit renovation and expansion of the present utility model.

[0029] The numbers in the figure are as follows: 1. Existing tunnel structure, 2. Renovation and expansion of tunnel foundation pit, 3. Renovation and expansion of tunnel enclosure, 4. Temporary steel columns, 5. Tunnel side walls to be removed, 6. First support, 7. Second support, 8. Existing tunnel top plate, 9. Existing tunnel bottom plate, 10. Permanent steel columns. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0031] Example 1

[0032] like Figure 1As shown, a retaining support system for a foundation pit for renovation and expansion of an underground structure comprises an existing tunnel structure 1, a renovation and expansion tunnel structure 2, a retaining wall for the renovation and expansion tunnel foundation pit 3, temporary steel columns 4, a side wall of the tunnel to be removed 5, a first support 6, and a second support 7. The existing tunnel structure 1 has an existing tunnel roof 8 at the top and an existing tunnel floor 9 at the bottom; the renovation and expansion tunnel foundation pit 2 has a first support 6 at the top and a support 7 in the middle; the side wall of the tunnel to be removed 5 is located to the side of the existing tunnel structure 1; the temporary steel columns 4 and the permanent steel columns 10 are both cylindrical steel columns with a diameter of 609 mm, wherein the temporary steel columns 3 are arranged along the side wall of the tunnel to be removed. The curve formed by the arrangement of the permanent steel columns 10 forms a set angle with the traffic direction of the existing tunnel structure and extends to connect with the outer side of the new renovation and expansion tunnel structure, wherein the angle is 20 to 40 degrees.

[0033] In order to provide support for the expanded tunnel foundation pit enclosure 3 during the excavation of the new tunnel foundation pit without affecting the traffic operation of the existing tunnel, the expanded tunnel foundation pit enclosure 3 transmits force to the existing tunnel top plate 8 through the expanded tunnel foundation pit first support 6, and transmits force to the existing tunnel bottom plate 9 through the expanded tunnel foundation pit second support 7.

[0034] The first support 6 of the tunnel foundation pit for the renovation and expansion is an 800×800 reinforced concrete support, while the second support 7 is a 609×16 steel support. The existing tunnel roof 8 and floor 9 are equipped with force-transmitting brackets that cooperate with the first support 6 and the second support 7, respectively.

[0035] like Figure 2 As shown, during excavation of the newly constructed tunnel foundation pit, the tunnel foundation pit enclosure 3 is fixed to the existing tunnel roof 8 of the existing tunnel structure 1 via the first support 6 and the first load-transmitting bracket. The first support 6 is arranged perpendicular to the existing tunnel structure 1. The tunnel foundation pit enclosure 3 transmits force to the first load-transmitting bracket above the existing tunnel roof 8 via the first support 6 to obtain support.

[0036] like Figure 3 As shown, the excavation enclosure 3 of the tunnel renovation and expansion is fixed to the existing tunnel roof 9 of the existing tunnel structure 1 via a second support 7 and a second force-transmitting corbel. The second support 7 is arranged perpendicular to the existing tunnel structure 1. The excavation enclosure 3 of the tunnel renovation and expansion is supported by transmitting force to the existing tunnel floor 9 via the second steel support 7.

[0037] In one embodiment of the present invention, an opening corresponding to the second steel support 7 is opened on the side wall 5 of the tunnel to be excavated, and the second steel support 7 is set through the side wall 5 of the tunnel to be excavated.

[0038] In another embodiment of the present invention, the second support 7 adopts a two-section support structure; wherein, the first section of the support connects the tunnel foundation pit enclosure 3 and one side of the tunnel side wall 5 to be removed, and the second section of the support connects the other side of the tunnel side wall 5 to be removed corresponding to the first section of the support and the existing tunnel floor 9.

[0039] At the same time, temporary steel columns 4 are set along the side walls 5 of the tunnel to be removed to facilitate the removal of the existing side walls 5 of the tunnel at a later time.

[0040] During the actual construction, while ensuring the operation of two lanes of underground traffic, one lane is closed and a row of temporary steel columns 4 are set up next to the side wall 5 to be removed of the existing tunnel structure 1. After the construction of the new tunnel floor of the expanded tunnel structure 2 is completed, the side wall 5 to be removed is demolished.

[0041] The following is the specific layout and construction process of the enclosure support system of this utility model:

[0042] Step 1: If Figure 4 As shown, the foundation pit retaining structure of the tunnel to be renovated and expanded is constructed, a lane close to the tunnel to be renovated and expanded is closed, and temporary steel columns 4 are set up;

[0043] Step 2: If Figure 5 As shown, the first load-transmitting bracket above the existing tunnel roof 8 is constructed, earthwork is excavated, and the first concrete support is erected;

[0044] Step 3: If Figure 6 As shown, the second force transmission bracket above the existing tunnel bottom plate 9 is constructed, earthwork is excavated, and the second steel support is erected;

[0045] Step 4: If Figure 7 As shown, the tunnel floor is being renovated and expanded, and the second steel support 7 and the second force transmission bracket on the existing tunnel floor 9 are being removed;

[0046] Step 5: If Figure 8 As shown, the existing tunnel side walls on the four sides of the temporary steel columns were removed, and the tunnel structure roof was renovated and expanded;

[0047] Step 6: If Figure 9 As shown, after the newly constructed, renovated and expanded tunnel structure is completed, the existing temporary steel columns 4 are removed in sequence.

[0048] As can be seen from the above, this enclosure support system can provide stable support for the tunnel foundation pit enclosure 3 during construction, and ensure the passage of lanes in the existing tunnel, thereby completing the tunnel renovation and expansion under uninterrupted operation. The above construction process is intended to better illustrate the structural features of this application. Those skilled in the art can obtain the same or similar solution steps based on the enclosure support system provided in this embodiment. This application does not involve improvements to specific construction method steps.

[0049] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A support system for an underground structure renovation and expansion foundation pit, used for providing support for a renovation and expansion tunnel foundation pit (2) of an existing tunnel structure (1), wherein the existing tunnel structure (1) comprises an existing tunnel top plate (8) close to the ground surface, an existing tunnel bottom plate (9) away from the ground surface, and a tunnel side wall (5) to be removed corresponding to the renovation and expansion tunnel foundation pit (2); characterized in that: The retaining support system includes a tunnel foundation pit retaining wall (3), a first support (6) and a second support (7); the tunnel foundation pit retaining wall (3) is arranged outside the tunnel foundation pit (2); one end of the first support (6) is connected and fixed to the existing tunnel top plate (8), and the other end is connected and fixed to the tunnel foundation pit retaining wall (3); one end of the second support (7) is connected and fixed to the tunnel foundation pit retaining wall (3), and the other end is connected and fixed to the existing tunnel bottom plate (9).

2. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The first support (6) is arranged perpendicular to the existing tunnel structure (1).

3. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The existing tunnel top plate (8) is provided with a first force transmission bracket corresponding to the first support (6), and the first support (6) is fixedly connected to the existing tunnel top plate (8) through the first force transmission bracket.

4. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The first support (6) is a reinforced concrete support.

5. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The second support (7) is arranged perpendicular to the existing tunnel structure (1).

6. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The existing tunnel floor (9) is provided with a second force transmission bracket corresponding to the second support (7), and the second support (7) is fixedly connected to the existing tunnel floor (9) through the second force transmission bracket.

7. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The side wall (5) of the tunnel to be excavated is provided with an opening corresponding to the second support (7), and the second support (7) is arranged to penetrate the side wall (5) of the tunnel to be excavated.

8. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1 is characterized in that: The second support (7) is a two-section support structure; wherein the first section of the support connects the tunnel foundation pit enclosure (3) and one side of the tunnel side wall (5) to be excavated, and the second section of the support connects the other side of the tunnel side wall (5) to be excavated corresponding to the first section of the support and the existing tunnel floor (9).

9. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1, characterized in that: The second support (7) is a steel support.

10. The enclosure support system for the foundation pit for renovation and expansion of an underground structure according to claim 1, characterized in that: The enclosure support system further comprises temporary steel columns (4); the temporary steel columns (4) are arranged along the side walls (5) of the tunnel to be excavated.

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