Expansion method of existing subway station by adding storey downward with non-closed beam combined pipe roof

Abstract

The application discloses a method for expanding and reconstructing an existing subway station by adding a layer downward by using a non-closed bundled pipe roof, which comprises the following steps: setting a starting shaft and a receiving shaft on both sides of the existing subway station; digging and setting a non-closed bundled pipe roof under the existing subway station; constructing a pre-supporting reinforcement body in the pipe roof; freezing the soil between the pipe roof and the bottom of the existing subway station to form a frozen cushion; constructing a water-stopping reinforcement member on the outside of the top of the pipe roof; excavating the soil between the pre-supporting reinforcement body and the bottom of the existing subway station; pouring and forming an inverse construction top beam which is used as a top pipe roof force transmission bracket at the bottom of the existing subway station; excavating the soil between the pre-supporting reinforcement body and the bottom of the pipe roof and removing the pre-supporting reinforcement body; and constructing a transfer passage structure in the construction space. The method solves the problems that it is difficult to realize platform transfer, the reinforcement amount is large, the construction disturbance is large, and the construction speed is slow when the existing shield method or the mine method is used for the expansion and reconstruction of the old station by adding a layer downward.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a method for expanding and reconstructing an existing subway station by using a non-closed bundled pipe roof. BACKGROUND

[0002] With the construction of urban subway projects, there are currently a large number of problems of expanding and reconstructing an old station by adding a layer downward in newly built subway lines. The current subway intersection node project often uses a shield method or a mine method for crossing construction. The shield method for crossing often has problems of non-connection of the platform layer of the new station, difficulty in realizing platform transfer, and deep line burial. The mine method for crossing often has problems of large construction risk, large reinforcement volume, slow construction speed, and large disturbance to the upper station structure.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0004] In order to overcome the defects of the prior art, a method for expanding and reconstructing an existing subway station by adding a layer downward by using a non-closed bundled pipe roof is provided to solve the problems of difficulty in realizing platform transfer, large reinforcement volume, large construction disturbance, and slow construction speed in the existing shield method or mine method for crossing construction in expanding and reconstructing an old station by adding a layer downward.

[0005] In order to achieve the above-mentioned purpose, a method for expanding and reconstructing an existing subway station by adding a layer downward by using a non-closed bundled pipe roof is provided, which comprises the following steps:

[0006] A starting well and a receiving well are respectively arranged on opposite sides of the existing subway station;

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

[0008] A pre-support reinforcement body is constructed in the non-closed bundled pipe roof, so that the pre-support reinforcement body is supported between the opposite inner walls of the non-closed bundled pipe roof;

[0009] The soil between the non-closed bundled pipe roof and the bottom of the existing subway station is frozen to form a frozen cushion;

[0010] A water stop reinforcement member is constructed on the outside of the non-closed bundled pipe roof, so that the water stop reinforcement member is connected to the outer wall of the non-closed bundled pipe roof, the frozen cushion, and the bottom of the existing subway station;

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

[0012] pouring a reverse construction roof beam at the bottom of the existing subway station, the reverse construction roof beam being arranged in the through gap and connected to the inner wall of the non-closed bundled pipe roof to form a connecting structure;

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

[0014] constructing a transfer passage structure in the construction space.

[0015] Further, the inner wall of the non-closed bundled pipe roof is provided with a plurality of compartmented pipe roofs, the plurality of compartmented pipe roofs divide the inner cavity of the non-closed bundled pipe roof into a plurality of separated compartments along the width direction of the non-closed bundled pipe roof, and before the non-closed bundled pipe roof is constructed, the method further comprises:

[0016] installing an inclined throw support between the lower part of the inner lining wall of the starting well and the receiving well and the bottom of the starting well and the receiving well;

[0017] excavating a diaphragm wall of the transfer passage structure at the upper part of the inner lining wall corresponding to the positions of the non-closed bundled pipe roof and the compartmented pipe roof;

[0018] installing a horizontal support at the upper part of the inner lining wall of the starting well and the receiving well;

[0019] excavating a diaphragm wall of the transfer passage structure at the lower part of the inner lining wall corresponding to the positions of the non-closed bundled pipe roof and the compartmented pipe roof for jacking construction of the non-closed bundled pipe roof.

[0020] Further, the number of the reverse construction roof beams is a plurality, and part of the reverse construction roof beams are respectively connected to the compartmented pipe roofs, and a freezing cushion is arranged between the compartmented pipe roofs and the bottom of the existing subway station.

[0021] Further, when the step of excavating the soil between the pre-supporting reinforcement body and the bottom of the non-closed bundled pipe roof is implemented, the soil of the plurality of separated compartments is excavated in the order of middle first and both sides later.

[0022] Further, the plurality of reverse construction roof beams are arranged along the width direction of the non-closed bundled pipe roof, and steel supports are connected between the plurality of reverse construction roof beams.

[0023] Further, the cross section of the non-closed bundled pipe roof is rectangular, and the through gap is arranged at the top of the non-closed bundled pipe roof.

[0024] Further, the water stop reinforcement and the pre-supporting reinforcement body are prepared by the MJS method.

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

[0026] The beneficial effect of the present application is that the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof sets end wells (originating well and receiving well) on the opposite sides of the existing subway station, uses pipe roof construction under the existing subway station, finally forms a non-closed bundled pipe roof support structure under the existing subway station, and then excavates by layers and sections, breaks the bottom plate of the existing subway station, and finally builds a platform interchange passage by constructing a concrete lining.

[0027] Compared with the shield method through the existing subway station, the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof can ensure the connectivity of the newly built station platform layer and realize the function of platform interchange. On the other hand, the pipe roof can be constructed close to the bottom plate of the existing station, and the node line does not need to be deepened during design.

[0028] Compared with the traditional mine method construction, the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof uses the non-closed bundled pipe roof structure as the enclosure support structure for adding layers downward of the existing subway station, has good rigidity, has less disturbance to the existing subway station, and has better safety. At the same time, it does not depend on the stratum condition and can be constructed in any stratum, having good stratum adaptability.

[0029] In addition, the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof does not need large-scale reinforcement, only needs reinforcement for the pipe joint in and out of the hole, and has less reinforcement volume.

[0030] Compared with the traditional mine method construction, the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof does not need to excavate multiple times through the diversion hole, and the soil in the pipe roof can be excavated in a single bin at one time, greatly increasing the construction speed. BRIEF DESCRIPTION OF DRAWINGS

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

[0032] Figures 1 to 12 The figure is a construction step schematic diagram of the method for expanding the existing subway station by adding layers downward using the non-closed bundled pipe roof of the embodiment of the present application.

[0033] Figure 13 The figure is a structure schematic diagram of the non-closed bundled pipe roof of the embodiment of the present application.

[0034] Figure 14 The figure is a structure schematic diagram of the non-closed bundled pipe roof of the embodiment of the present application. Figure 13a sectional view at E-E in FIG. 1.

[0035] Figure 15 a sectional view of a non-closed bundled pipe curtain of an embodiment of the present application. DETAILED DESCRIPTION

[0036] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and are not a limitation on the application. In addition, it should be noted that only parts related to the application are shown in the drawings for ease of description.

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0038] Referring to Figures 1 to 5 shown, wherein, Figure 3 is a sectional view at A-A in FIG. 1, Figure 2 is a sectional view at B-B in FIG. 1, Figure 5 is a sectional view at C-C in FIG. 1, Figure 4 is a sectional view at D-D in FIG. 1, the present application provides a method for expanding an existing subway station by adding a layer downward by using a non-closed bundled pipe curtain, comprising the following steps: Figure 7 Figure 6 S1, a starting well 4 and a receiving well 5 are respectively arranged on opposite sides of an existing subway station 11. Figure 8 Figure 6 Referring to shown, first, the starting well and the receiving well are constructed on opposite sides of the existing subway station 11. The construction temporary column plays a supporting role on the top of the second floor slab beam of the existing subway station.

[0039] After the internal structure construction of the working well of the starting well and the receiving well is completed, the pipe curtain pipe jacking access hole MJS is reinforced.

[0040] Figure 1 As a preferred embodiment, after the internal structure construction of the working well of the starting well and the receiving well is completed, the following steps are further included:

[0041] S11, an inclined throw support 8 is installed between the lower part of the inner lining wall of the starting well 4 and the receiving well 5 and the bottom of the starting well 4 and the receiving well 5.

[0042] S12, the diaphragm wall of the interchange channel structure 10 is excavated at the position corresponding to the non-closed bundled pipe curtain 1 and the compartment pipe curtain 6 on the upper part of the inner lining wall.

[0043] S12, the diaphragm wall of the interchange channel structure 10 is excavated at the position corresponding to the non-closed bundled pipe curtain 1 and the compartment pipe curtain 6 on the upper part of the inner lining wall.

[0044] S12, the diaphragm wall of the interchange channel structure 10 is excavated at the position corresponding to the non-closed bundled pipe curtain 1 and the compartment pipe curtain 6 on the upper part of the inner lining wall.

[0045] ​​S13, installing horizontal support 9 at the upper part of the lining wall of the launching shaft 4 and the receiving shaft 5.

[0046] S14, excavating the diaphragm 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 roof 1 and the compartment pipe roof 6 for the jacking construction of the non-closed bundled pipe roof 1.

[0047] Specifically, referring to Figure 2 shown in the drawings, the inclined throw support 8 is erected in the launching shaft and the receiving shaft. The inclined throw support 8 is thrown at the bottom plate of the working shaft. Referring to Figure 3 shown, the lining wall of the launching shaft and the lining wall of the receiving shaft are poured by spacing the diaphragm wall of the new station and the sandwich soil.

[0048] Referring to Figure 4 and Figure 5 shown, after the upper half of the lining wall of the launching shaft and the lining wall of the receiving shaft is constructed, the horizontal support 9 is used to support the upper half of the lining wall, and the lower half of the lining wall of the launching shaft and the lining wall of the receiving shaft is excavated by spacing.

[0049] S2, the non-closed bundled pipe roof 1 is punched through the soil under the existing subway station 11 by the launching shaft 4 and the receiving shaft 5.

[0050] Referring to Figures 6 to 8 shown, after the construction of the lining wall of the launching shaft and the lining wall of the receiving shaft is completed, the non-closed bundled pipe roof structure construction is carried out.

[0051] The cross section of the non-closed bundled pipe roof 1 is rectangular. A through gap is provided at the top of the non-closed bundled pipe roof 1.

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

[0053] The construction of the non-closed bundled pipe roof includes pipe roof jacking, pipe roof internal concrete filling, and prestressed tensioning. During the pipe roof jacking, the position of the temporary column is not constructed temporarily, and after the pipe roof jacking is completed at the remaining positions, the temporary column is underpinned by a permanent structure column, and the pipe roof jacking at the position of the temporary column is then carried out.

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

[0055] Referring to Figure 8 shown, the pre-supporting reinforcement body in the non-closed bundled pipe roof 1 mainly plays a pre-supporting role when the soil inside the pipe roof is excavated.

[0056] S4, freezing the soil between the non-closed bundled pipe roof 1 and the bottom of the existing subway station 11 to form a frozen cushion 21.

[0057] S5, constructing a water-stop reinforcement 23 outside the non-closed bundled pipe roof 1, so that the water-stop reinforcement 23 is connected to the outer wall of the non-closed bundled pipe roof 1, the frozen cushion 21 and the bottom of the existing subway station 11.

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

[0059] S7, pouring the inverse roof beam 22 at the bottom of the existing subway station 11 to form a top pipe roof transfer leg, so that the inverse roof beam 22 is arranged in the through gap and connected to the inner wall of the non-closed bundled pipe roof 1 to form a connection structure 2.

[0060] Continue to combine Figures 6 to 8 As shown, the water-stop reinforcement, the pipe roof pre-support reinforcement and the frozen cushion of the connection structure are constructed from the starting well or the receiving well, wherein the pipe roof water-stop reinforcement and the frozen cushion mainly play the role of water stopping and vertical force transmission.

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

[0062] As a preferred embodiment, the two ends of the non-closed bundled pipe roof 1 are connected to the starting well 4 and the receiving well 5 through the well joint 12 respectively.

[0063] Specifically, referring to Figure 9 and Figure 10 As shown, the non-closed bundled pipe roof is connected to the inner lining wall of the starting well and the inner lining wall of the receiving well to form a whole through the construction of the well joint. Then, the excavation of the upper soil of the pre-support reinforcement is performed first, and the inverse roof beam is constructed.

[0064] In this embodiment, the number of inverse roof beams 22 is multiple. Part of the inverse roof beams 22 are connected to the compartment pipe roof 6 respectively. The compartment pipe roof 6 is provided with a frozen cushion 21 between the bottom of the existing subway station 11.

[0065] As a preferred embodiment, the multiple inverse roof beams 22 are arranged along the width direction of the non-closed bundled pipe roof 1. Steel supports 7 are connected between the multiple inverse roof beams 22.

[0066] Steel supports are used as supports between the two adjacent inverse roof beams. The inverse roof beam plays the role of water and soil isolation and force transmission inside and outside the pipe roof.

[0067] S8, excavate the soil between the pre-supporting reinforcement body 3 and the bottom of the non-closed bundled pipe roof 1 and remove the pre-supporting reinforcement body 3, so that a construction space is formed in the non-closed bundled pipe roof 1.

[0068] In the step of excavating the soil between the pre-supporting reinforcement body 3 and the bottom of the non-closed bundled pipe roof 1, the soil of the multiple partitioned compartments is excavated in the order of middle first and both sides later.

[0069] S9, construct the transfer passage structure 10 in the construction space.

[0070] In the embodiment, when the soil in one partitioned compartment is continuously excavated to the bottom of the partitioned compartment, the transfer passage structure in the partitioned compartment is constructed later.

[0071] The internal soil of the left and right two partitioned compartments is excavated to the bottom of the pipe roof in turn towards the opposite two sides of the non-closed bundled pipe roof. The pipe roof of the middle partitioned compartment is cut off, and the remaining part of the transfer passage structure is constructed.

[0072] The method for expanding the existing subway station downward by using the non-closed bundled pipe roof is a method for expanding the existing subway station downward by using the non-closed bundled pipe roof.

[0073] The method for expanding the existing subway station downward by using the non-closed bundled pipe roof adopts the method of setting end shafts (starting shaft and receiving shaft) on the opposite two sides of the existing subway station, constructing the pipe roof under the existing subway station, finally forming the non-closed bundled pipe roof supporting structure under the existing subway station, and then constructing the concrete lining by layering and segmenting, so as to finally build the platform transfer passage.

[0074] Compared with the shield method for passing through the existing subway station, the method for expanding the existing subway station downward by using the non-closed bundled pipe roof can ensure the communication of the newly-built station platform layer and realize the function of platform transfer. On the other hand, the pipe roof can be constructed close to the bottom plate of the existing station, and the node line does not need to be deepened during design.

[0075] Compared with the traditional mine method construction, the method for expanding the existing subway station downward by using the non-closed bundled pipe roof uses the non-closed bundled pipe roof structure as the enclosure supporting structure for expanding the existing subway station downward, has good rigidity, has less disturbance to the existing subway station, and has better safety. At the same time, the method does not depend on the stratum condition and can be constructed in any stratum, and has good stratum adaptability.

[0076] In addition, the method for expanding the existing subway station downward by using the non-closed bundled pipe roof does not need large-scale reinforcement, only needs reinforcement for the pipe joint in and out of the hole, and has less reinforcement amount.

[0077] Compared with the traditional mine method construction, the expansion method of the application does not need to carry out multiple excavations of the split diversion hole, and the soil in the pipe roof can be excavated in a single bin, which greatly increases the construction speed.

[0078] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles. It should be understood by those skilled in the art that the scope of the application involved in the application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form a technical solution.

Claims

1. A method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain, characterized in that, Includes the following steps: The starting shaft and the receiving shaft are respectively set on opposite sides of the existing subway station; A non-closed bundled pipe curtain is installed in the soil beneath the existing subway station through the launching shaft and the receiving shaft. A pre-supported reinforcement body is constructed inside the non-closed bundled tube curtain, such that the pre-supported reinforcement body is supported between two opposing inner walls of the non-closed bundled tube curtain; A frozen cushion layer is formed by freezing the soil between the non-closed bundled tube curtain and the bottom of the existing subway station. Water-stopping reinforcements are constructed on the outside of the non-closed bundled tube curtain, such that the water-stopping reinforcements are connected to the outer wall of the non-closed bundled tube curtain, the freezing pad layer, and the bottom of the existing subway station. Excavate the soil between the pre-supported reinforced body and the bottom of the existing subway station; A reverse-construction top beam is cast at the bottom of the existing subway station, which also serves as a force transmission bracket for the top tube curtain. The reverse-construction top beam is set in the through gap and connected to the inner wall of the non-closed bundled tube curtain to form a connection structure. The through gap is set at the top of the non-closed bundled tube curtain. Excavate the soil between the pre-supported solid body and the bottom of the non-closed bundled tube curtain and remove the pre-supported solid body to create a construction space inside the non-closed bundled tube curtain; The transfer passage structure will be constructed within the construction space.

2. The method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain as described in claim 1, characterized in that, The inner wall of the non-closed bundled tube curtain is provided with multiple compartmentalized tube curtains, which divide the inner cavity of the non-closed bundled tube curtain into multiple compartments along the width direction of the non-closed bundled tube curtain. Before installing the non-closed bundled tube curtain, the following is also included: An inclined brace is installed 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; The diaphragm wall of the transfer passage structure is excavated at the position corresponding to the non-closed bundled tube curtain and the compartment tube curtain on the upper part of the inner lining wall; Horizontal supports are installed on the upper part of the inner lining walls of the launching well and the receiving well; At the lower part of the inner lining wall, corresponding to the positions of the non-closed bundled tube curtain and the compartment tube curtain, the diaphragm wall of the transfer passage structure is excavated to facilitate the jacking construction of the non-closed bundled tube curtain.

3. The method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain as described in claim 2, characterized in that, The number of the reverse-operation top beams is multiple, and some of the reverse-operation top beams are respectively connected to the compartment pipe curtain. A freezing pad layer 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 a lower level using a non-closed bundled tube curtain as described in claim 2, characterized in that, When carrying out the step of excavating the soil between the pre-supported solid body and the bottom of the non-closed bundled tube curtain, the soil of 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 a lower level using a non-closed bundled tube curtain as described in claim 2, characterized in that, Multiple reverse-operation top beams are arranged along the width direction of the non-closed bundled tube curtain, and steel supports connect the multiple reverse-operation top beams.

6. The method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain as described in claim 1, characterized in that, The cross-section of the non-closed bundled tube curtain is rectangular.

7. The method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain as described in claim 1, characterized in that, The water-stopping reinforcement and the pre-supported reinforcement are prepared using the MJS method.

8. The method for expanding an existing subway station by adding a lower level using a non-closed bundled tube curtain as described in claim 1, characterized in that, The two ends of the non-closed bundled tube curtain are respectively connected to the launching well and the receiving well via well joints.

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