Extension method for adding storey downwards to existing subway station by using non-closed bunched pipe roofing

Abstract

The invention discloses an extension method for adding a layer downwards to an existing subway station by using a non-closed bundled pipe curtain. The extension method comprises the following steps: arranging a starting well and a receiving well on two sides of the existing subway station; arranging a non-closed bunching pipe curtain below the existing subway station; pre-supporting reinforcing bodies are constructed in the pipe roofing; a freezing cushion layer is formed by freezing a soil body between the pipe curtain and the bottom of the existing subway station; constructing a water stop reinforcing member on the outer side of the top of the pipe roof; a soil body between the pre-supporting reinforcing body and the bottom of the existing subway station is excavated; the bottom of the existing subway station is poured to form a reverse top beam which is also used as a top pipe roof force transfer bracket; a soil body between the pre-supporting reinforcing body and the bottom of the pipe curtain is excavated, and the pre-supporting reinforcing body is dismantled; and the transfer channel structure is constructed in the construction space. The problems that platform transfer is difficult to achieve or the reinforcement amount is large, the construction disturbance is large and the construction speed is low due to the fact that existing shield method or mining method crossing construction is adopted for downward storey adding extension and transformation of the old station are solved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a method for expanding an existing subway station by adding floors downwards by utilizing a non-closed bundled pipe curtain. Background Art

[0002] With the construction of urban subway projects, new subway lines currently face a large number of problems in the expansion and reconstruction of old stations. Currently, subway intersection node projects often use shield or mining methods for crossing construction. Shield crossing often has problems such as the platform level of the new station is not connected, it is difficult to achieve platform transfer, and the line is buried deep. Mining crossing often has problems such as high construction risk, large reinforcement volume, slow construction speed, and large disturbance to the upper station structure.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] In order to overcome the defects of the existing technology, a method for expanding the existing subway station by adding floors downwards using a non-closed bundled pipe curtain is provided to solve the problems of difficulty in realizing platform transfer or reinforcement, large construction disturbance and slow construction speed in the existing shield method or mining method for the expansion and reconstruction of the old station downwards.

[0005] In order to achieve the above-mentioned purpose, a method for expanding an existing subway station by adding floors downwards using a non-closed bundled pipe curtain is provided, comprising the following steps:

[0006] A departure shaft and a receiving shaft are set up on opposite sides of an existing subway station;

[0007] A non-closed bundled pipe curtain is installed in the soil below the existing subway station through the starting well and the receiving well;

[0008] Constructing a pre-support reinforcement body in the non-closed bundled pipe curtain, so that the pre-support reinforcement body is supported between two opposite inner walls of the non-closed bundled pipe curtain;

[0009] forming a freezing cushion layer by freezing the soil between the non-closed bundled pipe curtain and the bottom of the existing subway station;

[0010] Constructing a water-stop reinforcement member on the outer side of the non-closed bundled pipe curtain, so that the water-stop reinforcement member is connected to the outer wall of the non-closed bundled pipe curtain, the freezing pad layer and the bottom of the existing subway station;

[0011] Excavating the soil between the pre-support reinforcement body and the bottom of the existing subway station;

[0012] Casting a reverse top beam at the bottom of the existing subway station and serving as a top pipe curtain force transmission bracket, so that the reverse top beam is arranged in the through-notch and connected to the inner wall of the non-closed bundled pipe curtain to form a connection structure;

[0013] Excavating the soil between the pre-support reinforcement body and the bottom of the non-closed bundled pipe curtain and removing the pre-support reinforcement body, so that a construction space is formed in the non-closed bundled pipe curtain;

[0014] A transfer passage structure is constructed within the construction space.

[0015] Furthermore, the inner wall of the non-closed bundled tube curtain is provided with a plurality of compartment tube curtains, and the plurality of compartment tube curtains divide the inner cavity of the non-closed bundled tube curtain into a plurality of compartments along the width direction of the non-closed bundled tube curtain. Before the non-closed bundled tube curtain is installed, it also includes:

[0016] Installing an inclined brace between the lower part of the inner lining wall of the launching well and the receiving well and the bottom of the launching well and the receiving well;

[0017] Excavating the ground-connected wall of the transfer passage structure at the upper part of the inner lining wall corresponding to the position of the non-closed bundled pipe curtain and the compartment pipe curtain;

[0018] Installing horizontal supports on the upper parts of the inner lining walls of the launching well and the receiving well;

[0019] The ground-connected wall of the transfer passage structure is excavated at the lower part of the lining wall at the position corresponding to the non-closed bundled pipe curtain and the compartment pipe curtain for the jacking construction of the non-closed bundled pipe curtain.

[0020] Furthermore, there are multiple reverse-built top beams, some of which are respectively connected to the compartment pipe curtains, and a freezing pad is provided between the compartment pipe curtain and the bottom of the existing subway station.

[0021] Furthermore, when the step of excavating the soil between the pre-support reinforcement body and the bottom of the non-closed bundled pipe curtain is implemented, the soil of the multiple compartments is excavated in the order of first the middle and then the two sides.

[0022] Furthermore, a plurality of the reverse-built top beams are arranged along the width direction of the non-closed bundled tube curtain, and steel supports are connected between the plurality of the reverse-built top beams.

[0023] Furthermore, the cross section of the non-closed bundled tube curtain is rectangular, and the through-notch is arranged at the top of the non-closed bundled tube curtain.

[0024] Furthermore, the water-stop reinforcement member and the pre-support reinforcement member are prepared by MJS method.

[0025] Furthermore, two ends of the non-closed bundled pipe curtain are respectively connected to the originating well and the receiving well through well joints.

[0026] The beneficial effect of the present invention lies in that the method for expanding an existing subway station by adding floors downwards by using a non-closed bundled pipe curtain of the present invention adopts the method of setting end wells (a starting well and a receiving well) on opposite sides of the existing subway station, and adopts pipe curtain construction under the existing subway station, and finally forms a non-closed bundled pipe curtain support structure under the existing subway station, and then through layered and segmented excavation, the bottom plate of the existing subway station is broken, and a concrete lining is applied to finally build a construction process of a platform transfer passage.

[0027] Compared with the shield method of penetrating the existing subway station, the expansion method of the present invention for adding floors downward by using a non-closed bundled pipe curtain can ensure the connectivity of the platform layers of the newly built station and realize the function of platform transfer; on the other hand, the pipe curtain can be constructed close to the existing station floor, and there is no need to deepen the node line when designing it.

[0028] Compared with the traditional mining method, the expansion method of the present invention using the non-closed bundled pipe curtain to add layers to the existing subway station has better rigidity, less disturbance to the existing subway station, and better safety. At the same time, it is not dependent on the formation conditions and can be constructed in any formation, with good formation adaptability.

[0029] In addition, the expansion method of the present invention for adding floors downward to an existing subway station using a non-closed bundled pipe curtain does not require large-scale reinforcement, and only requires reinforcement of the pipe sections entering and exiting the hole, and the reinforcement volume is relatively small.

[0030] Compared with the traditional mining method, the expansion method of the present invention for adding floors downward to an existing subway station by using a non-closed bundled pipe curtain does not require multiple excavations of branch guide tunnels. The soil inside the pipe curtain can be excavated in a single chamber at one time, which greatly increases the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figures 1 to 12 The present invention is a schematic diagram of the construction steps of a method for expanding an existing subway station by adding floors downwards using a non-closed bundled pipe curtain according to an embodiment of the present invention.

[0033] Fig.13 Schematic diagram of the structure of a non-closed bundled tube curtain according to an embodiment of the present invention.

[0034] Fig.14 for Fig.13Cross-sectional view at EE in FIG.

[0035] Fig.15 It is a cross-sectional view of a non-closed bundled tube curtain according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] Reference Figures 1 to 5 As shown, Figure 3 for Figure 2 The cross-sectional view at AA in the figure is as follows: Figure 5 for Figure 4 The cross-sectional view at BB in the figure is as follows: Figure 7 for Figure 6 The cross-sectional view at CC in the figure, Figure 8 for Figure 6 The present invention provides a method for expanding an existing subway station by adding floors downwards by using a non-closed bundled tube curtain, comprising the following steps:

[0039] S1. A departure shaft 4 and a receiving shaft 5 are respectively set on opposite sides of an existing subway station 11.

[0040] See also Figure 1 As shown, first, the departure shaft and the receiving shaft are constructed on opposite sides of the existing subway station 11. The temporary columns are constructed to support the cross beams of the lower two-layer slabs on the top of the existing subway station.

[0041] After the internal structure construction of the starting well and the receiving well is completed, the MJS reinforcement of the pipe curtain top pipe in and out of the hole is carried out.

[0042] As a preferred implementation method, after the internal structure of the working well of the starting well and the receiving well is completed, the following steps are also included:

[0043] S11. Install the inclined brace 8 between the lower part of the inner lining wall of the launching well 4 and the receiving well 5 and the bottom of the launching well 4 and the receiving well 5.

[0044] S12, excavating the ground-connected wall of the transfer passage structure 10 at the position of the non-closed bundled pipe curtain 1 and the compartment pipe curtain 6 on the upper part of the inner lining wall.

[0045] S13. Install horizontal supports 9 on the upper parts of the inner lining walls of the launching well 4 and the receiving well 5.

[0046] S14, excavating the ground-connected wall of the transfer passage structure 10 at the lower part of the lining wall corresponding to the position of the non-closed bundled pipe curtain 1 and the compartment pipe curtain 6 for the jacking construction of the non-closed bundled pipe curtain 1.

[0047] For details, see Figure 2 As shown in FIG. 1 , in the launching well and the receiving well, an inclined support 8 is set up. The inclined support 8 is inclined at the bottom plate of the working well. Figure 3 As shown, the ground-connected walls and sandwich soil of the new station are excavated at intervals, and the lining walls of the starting shaft and the receiving shaft are poured.

[0048] See also Figure 4 and Figure 5 As shown, after the upper part of the structure construction of the lining wall of the starting well and the lining wall of the receiving well is completed, the upper part of the lining wall is supported by horizontal supports 9, and the lower part of the lining wall of the starting well and the lining wall of the receiving well are excavated at intervals.

[0049] S2. A non-closed bundled pipe curtain 1 is driven into the soil below the existing subway station 11 through the starting shaft 4 and the receiving shaft 5.

[0050] See also Figures 6 to 8 As shown, after the construction of the inner lining wall of the starting well and the inner lining wall of the receiving well is completed, the construction of the non-closed bundled pipe curtain structure is carried out.

[0051] The cross section of the non-closed bundled tube curtain 1 is rectangular. The through-notch is arranged at the top of the non-closed bundled tube curtain 1.

[0052] The non-closed bundled tube curtain is in a U-shape as a whole. In this embodiment, the inner wall of the non-closed bundled tube curtain 1 is provided with a plurality of compartment tube curtains 6, which divide the inner cavity of the non-closed bundled tube curtain 1 into a plurality of compartments along the width direction of the non-closed bundled tube curtain 1.

[0053] The construction of the non-closed bundled pipe curtain includes the jacking of the steel pipe curtain, the filling of concrete in the pipe curtain, and the prestressing. During the jacking process of the steel pipe curtain, the temporary column position is temporarily stopped. After the jacking of the pipe curtain at other positions is completed, the temporary column is replaced with a permanent structural column, and then the jacking construction of the pipe curtain at the temporary column position is carried out.

[0054] S3, constructing a pre-support reinforcement body 3 in the non-closed bundled pipe roof 1, so that the pre-support reinforcement body 3 is supported between two opposite inner walls of the non-closed bundled pipe roof 1.

[0055] See also Figure 8 As shown, the pre-support reinforcement body in the non-closed bundled pipe curtain 1 mainly plays a pre-support role when the soil inside the pipe curtain is excavated.

[0056] S4, forming a freezing cushion layer 21 by freezing the soil between the non-closed bundled pipe curtain 1 and the bottom of the existing subway station 11.

[0057] S5 , constructing a water-stop reinforcement member 23 on the outer side of the non-closed bundled pipe curtain 1 , so that the water-stop reinforcement member 23 is connected to the outer wall of the non-closed bundled pipe curtain 1 , the freezing pad layer 21 and the bottom of the existing subway station 11 .

[0058] S6. Excavate the soil between the pre-support reinforcement body 3 and the bottom of the existing subway station 11.

[0059] S7. Cast a reverse top beam 22 at the bottom of the existing subway station 11 and serve as a force transmission bracket for the top pipe curtain, so that the reverse top beam 22 is arranged in the through-notch and connected to the inner wall of the non-closed bundled pipe curtain 1 to form a connection structure 2.

[0060] Continue to combine Figures 6 to 8 As shown, from the starting well or the receiving well, the water-stop reinforcement parts, the pipe curtain pre-support reinforcement parts and the freezing pad layer of the connecting structure are constructed, among which the pipe curtain water-stop reinforcement parts and the freezing pad layer mainly play the role of water-stopping and vertical force transmission.

[0061] As a preferred embodiment, the water-stop reinforcement member 23 and the pre-support reinforcement member 3 are prepared by MJS method (omnidirectional high-pressure spraying method).

[0062] As a preferred implementation, both ends of the non-closed bundled pipe curtain 1 are connected to the starting well 4 and the receiving well 5 respectively through well joints 12 .

[0063] For details, see Fig. 9 and Fig.10 As shown, the well joint is constructed to connect the non-closed bundled pipe curtain with the inner lining wall of the starting well and the inner lining wall of the receiving well into a whole. After that, the upper soil of the pre-support reinforcement body is excavated first, and the top beam is constructed in reverse.

[0064] In this embodiment, there are a plurality of reverse top beams 22. Some of the reverse top beams 22 are respectively connected to the compartment pipe curtain 6. A freezing pad 21 is provided between the compartment pipe curtain 6 and the bottom of the existing subway station 11.

[0065] As a preferred embodiment, a plurality of reverse top beams 22 are arranged along the width direction of the non-closed bundled tube curtain 1. Steel supports 7 are connected between the plurality of reverse top beams 22.

[0066] Steel supports are used between two adjacent top beams. The top beams can isolate the water and soil inside and outside the pipe curtain and transmit force.

[0067] S8, excavating the soil between the pre-support reinforcement body 3 and the bottom of the non-closed bundled pipe curtain 1 and removing the pre-support reinforcement body 3, so that a construction space is formed in the non-closed bundled pipe curtain 1.

[0068] When the step of excavating the soil between the pre-support reinforcement body 3 and the bottom of the non-closed bundled pipe curtain 1 is implemented, the soil of the multiple compartments is excavated in the order of the middle first and then the two sides.

[0069] S9. Constructing a transfer passage structure 10 in the construction space.

[0070] In this embodiment, when the soil in a compartment is continuously excavated to the bottom of the compartment, the transfer passage structure in the compartment is then constructed.

[0071] The internal soil of the two compartments on the left and right is excavated toward the opposite sides of the non-closed bundled pipe curtain to the bottom of the pipe curtain. Then the middle compartment pipe curtain is cut off and the remaining part of the transfer channel structure is constructed.

[0072] The invention discloses a method for expanding an existing subway station by adding a floor downwards by using a non-closed bundled pipe curtain. The invention discloses a method for expanding an existing subway station by adding a floor downwards by using a non-closed bundled pipe curtain.

[0073] The method for expanding an existing subway station by adding floors downwards by utilizing a non-closed bundled pipe curtain of the present invention adopts the following steps: setting end wells (a starting well and a receiving well) on opposite sides of the existing subway station, and adopting pipe curtain construction under the existing subway station, and finally forming a non-closed bundled pipe curtain support structure under the existing subway station; then, through layered and segmented excavation, the bottom plate of the existing subway station is broken, and a concrete lining is applied to finally build a construction process of a platform transfer passage.

[0074] Compared with the shield method of penetrating the existing subway station, the expansion method of the present invention for adding floors downward by using a non-closed bundled pipe curtain can ensure the connectivity of the platform layers of the newly built station and realize the function of platform transfer; on the other hand, the pipe curtain can be constructed close to the existing station floor, and there is no need to deepen the node line when designing it.

[0075] Compared with the traditional mining method, the method for expanding the existing subway station downward by using the non-closed bundled pipe curtain of the present invention has better rigidity, less disturbance to the existing subway station, and better safety. At the same time, it is not dependent on the formation conditions and can be constructed in any formation, with good formation adaptability.

[0076] In addition, the expansion method of the present invention for adding floors downward to an existing subway station using a non-closed bundled pipe curtain does not require large-scale reinforcement, and only requires reinforcement of the pipe sections entering and exiting the hole, and the reinforcement volume is relatively small.

[0077] Compared with the traditional mining method, the expansion method of the present invention for adding floors downward to an existing subway station by using a non-closed bundled pipe curtain does not require multiple excavations of branch guide tunnels. The soil inside the pipe curtain can be excavated in a single chamber at one time, which greatly increases the construction speed.

[0078] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain, characterized in that: The following steps are involved: A departure shaft and a receiving shaft are set up on opposite sides of an existing subway station; A non-closed bundled pipe curtain is installed in the soil below the existing subway station through the starting well and the receiving well; Constructing a pre-support reinforcement body in the non-closed bundled pipe curtain, so that the pre-support reinforcement body is supported between two opposite inner walls of the non-closed bundled pipe curtain; forming a freezing cushion layer by freezing the soil between the non-closed bundled pipe curtain and the bottom of the existing subway station; Constructing a water-stop reinforcement member on the outer side of the non-closed bundled pipe curtain, so that the water-stop reinforcement member is connected to the outer wall of the non-closed bundled pipe curtain, the freezing pad layer and the bottom of the existing subway station; Excavating the soil between the pre-support reinforcement body and the bottom of the existing subway station; Casting a reverse top beam at the bottom of the existing subway station and serving as a top pipe curtain force transmission bracket, so that the reverse top beam is arranged in the through-notch and connected to the inner wall of the non-closed bundled pipe curtain to form a connection structure; Excavating the soil between the pre-support reinforcement body and the bottom of the non-closed bundled pipe curtain and removing the pre-support reinforcement body, so that a construction space is formed in the non-closed bundled pipe curtain; A transfer passage structure is constructed within the construction space.

2. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 1, characterized in that: The inner wall of the non-closed bundled tube curtain is provided with a plurality of compartment tube curtains, and the plurality of compartment tube curtains divide the inner cavity of the non-closed bundled tube curtain into a plurality of compartments along the width direction of the non-closed bundled tube curtain. Before the non-closed bundled tube curtain is installed, it also includes: Installing an inclined brace between the lower part of the inner lining wall of the launching well and the receiving well and the bottom of the launching well and the receiving well; Excavating the ground-connected wall of the transfer passage structure at the upper part of the inner lining wall corresponding to the position of the non-closed bundled pipe curtain and the compartment pipe curtain; Installing horizontal supports on the upper parts of the inner lining walls of the launching well and the receiving well; The ground-connected wall of the transfer passage structure is excavated at the lower part of the lining wall at the position corresponding to the non-closed bundled pipe curtain and the compartment pipe curtain for the jacking construction of the non-closed bundled pipe curtain.

3. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 2 is characterized in that: There are multiple reverse-built top beams, some of which are respectively connected to the compartment pipe curtains, and a freezing pad is provided between the compartment pipe curtain and the bottom of the existing subway station.

4. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 2, characterized in that: When the step of excavating the soil between the pre-support reinforcement body and the bottom of the non-closed bundled pipe curtain is implemented, the soil of the multiple compartments is excavated in the order of first the middle and then the two sides.

5. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 2, characterized in that: A plurality of the reverse top beams are arranged along the width direction of the non-closed bundled tube curtain, and steel supports are connected between the plurality of the reverse top beams.

6. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 1, characterized in that: The cross section of the non-closed bundled tube curtain is rectangular, and the through-notch is arranged at the top of the non-closed bundled tube curtain.

7. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 1, characterized in that: The water-stop reinforcement member and the pre-support reinforcement member are prepared by the MJS method.

8. The method for expanding an existing subway station by adding floors downwards using a non-closed bundled tube curtain according to claim 1, characterized in that: The two ends of the non-closed bundled pipe curtain are respectively connected to the starting well and the receiving well through well joints.

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