Construction method of subway station combined structure

Abstract

The present application relates to a kind of construction methods of subway station combined structure, applied to subway station;Including: the road of closed second structure area, and support structure is made below road;First structural area is constructed using open cut method, after first structural area is open cut to preset elevation, to the construction small pilot hole of dark excavation area;Second structural area is constructed using PBA construction method, small pilot hole is penetrated, and the middle pile and steel pipe column of subway station are made in small pilot hole;Synchronous excavation lower layer earthwork of second structural area and third structural area, and the main structure bottom plate, longitudinal beam, cross beam and side wall of corresponding earthwork are made;Remove the common ground connecting wall and construction platform plate of second structural area and third structural area, and structure is sequentially made upwards in the open cut first structural area.The present application alleviates the technical problems in the prior art that the construction of the subway station matched with the high-speed rail station is interfered by the construction of other supporting facilities.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground construction engineering, and in particular to a construction method of a combined structure of a subway station. BACKGROUND

[0002] The construction of a subway station matched with a high-speed rail station is usually interfered by the construction of other matched facilities, so it is impossible to adopt a single structure form, and it is necessary to divide the subway station into different structural sections along the longitudinal direction according to the construction planning of the whole hub, and different structure forms are adopted for each structural section, and corresponding construction methods are adopted for different structure forms. SUMMARY

[0003] Therefore, the present application provides a construction method of a combined structure of a subway station to alleviate the technical problem that the construction of a subway station matched with a high-speed rail station is interfered by the construction of other matched facilities in the prior art.

[0004] In a first aspect, an embodiment of the present application provides a construction method of a combined structure of a subway station, applied to a subway station; the combined structure of the subway station is divided into four structural sections, i.e., a first structural section, a second structural section, a third structural section and a fourth structural section, along the longitudinal direction; wherein the second structural section is a structural section directly below a road passing through the subway station; the combined structure of the subway station includes four layers of structures; the method comprises: closing the road of the second structural section and constructing a supporting structure below the road; the supporting structure below the road comprises: a top plate of the second structural section, a top plate of the third structural section and a diaphragm wall supporting structure below the road; the first structural section is constructed by using an open excavation method, a small pilot tunnel is constructed in the dark excavation area after the first structural section is excavated to a preset elevation; the second structural section is constructed by using a PBA construction method, the middle pile and the steel pipe column of the subway station are constructed in the small pilot tunnel after the small pilot tunnel is penetrated; the lower layer of earthwork of the second structural section and the third structural section is excavated synchronously, and the main structure bottom plate, the longitudinal beam, the cross beam and the side wall corresponding to the earthwork are constructed; the common diaphragm wall and the construction platform plate of the second structural section and the third structural section are removed, and the structure of the first structural section is constructed upward in sequence.

[0005] Further, the construction of the supporting structure below the road comprises: closing the road of the second structural section, constructing the diaphragm wall supporting structure below the road, and closing the top plate to form a frame structure; wherein the underground continuous wall is made as part of the station side wall structure, and forms a composite wall with the side wall; the earthwork is backfilled to complete the road construction of the second structural section; the pile foundation and the steel pipe column structure of the third structural section are constructed, and then the top-down excavation top plate structure in the third structural section is constructed; after the strength of the top-down excavation top plate structure and the pile foundation base of the third structural section reaches a first preset strength, the attached structure above the top plate is constructed.

[0006] Further, the lower earthwork of the second structure area and the third structure area is excavated synchronously, and the main structure bottom plate, the longitudinal beam, the cross beam and the side wall corresponding to the earthwork are constructed, including: excavating the first layer of remaining earthwork in the second structure area and constructing the first layer of main structure bottom plate, cross beam, longitudinal beam and side wall; after the first layer of concrete reaches the second preset strength, excavating the second layer of earthwork in the second structure area and constructing the second layer of main structure bottom plate, longitudinal beam, cross beam and side wall; after the second layer of concrete reaches the third preset strength, excavating the third layer of earthwork in the second structure area and the third structure area synchronously and constructing the third layer of main structure bottom plate, longitudinal beam, cross beam and side wall; after the third layer of concrete reaches the fourth preset strength, excavating the fourth layer of earthwork in the second structure area and the third structure area synchronously and constructing the fourth layer of main structure bottom plate, longitudinal beam, cross beam and side wall.

[0007] The application provides a construction method of a combined structure of a subway station, and is applied to the subway station. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0009] Figure 1 A flow chart of the construction method of the combined structure of the subway station provided by the embodiment of the present application is shown in the figure.

[0010] Figure 2 A top view of the combined structure of the subway station provided by the embodiment of the present application is shown in the figure.

[0011] Figure 3 A construction section view of the second structure area provided by the embodiment of the present application is shown in the figure.

[0012] Figure 4 A road section view of the second structure area provided by the embodiment of the present application is shown in the figure.

[0013] Figure 5 A schematic view of the top plate accessory structure of the third structure area provided by the embodiment of the present application is shown in the figure.

[0014] Figure 6 A small guide hole profile view provided for the embodiment of the present application;

[0015] Figure 7 A PBA construction method pile and column structure construction profile view provided for the embodiment of the present application;

[0016] Figure 8 A second structure area underground excavation two-layer construction completion profile view provided for the embodiment of the present application;

[0017] Figure 9 A second structure area and first structure area construction completion profile view provided for the embodiment of the present application;

[0018] Figure 10 A open excavation area to the first structure area three-layer profile view provided for the embodiment of the present application;

[0019] Figure 11 An open excavation area construction completion profile view provided for the embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined purposes, the specific embodiments, structures, features and effects of the present application will be described in detail below in combination with the drawings and preferred embodiments.

[0021] Figure 1 is a flow chart of a construction method of a subway station combined structure according to the embodiment of the present application, and the method is applied to a subway station. Figure 2 is a plan view of a subway station combined structure according to the embodiment of the present application, as shown in Figure 2 , the subway station combined structure is sequentially divided into four structure areas along the longitudinal direction, i.e. a first structure area (i.e. area I in Figure 2 ), a second structure area (i.e. area II in Figure 2 ), a third structure area (i.e. area III in Figure 2 ) and a fourth structure area (i.e. area IV in Figure 2 ); wherein the second structure area is a structure area directly below the road in the subway station; and the subway station combined structure comprises four layers of structures.

[0022] As shown in Figure 1 , the method provided by the embodiment of the present application specifically comprises the following steps:

[0023] Step S102, close the road of the second structure area, and construct the support structure below the road; the support structure below the road comprises: a second structure area top plate, a third structure area top plate and a ground wall support structure below the road.

[0024] Step S104: The first structural area is constructed by the open cut method. After the first structural area is excavated by open cut to the preset elevation, small pilot tunnels are constructed towards the mined - out area.

[0025] Step S106: The second structural area is constructed by the PBA construction method. After the small pilot tunnels are贯通 (the Chinese character here seems to be a misspelling, assuming it should be '贯通' which means 'connected through'), the middle piles and steel pipe columns of the subway station are constructed in the small pilot tunnels.

[0026] Step S108: The lower - layer earthwork of the second and third structural areas is excavated synchronously, and the main structure floor slabs, longitudinal beams, cross - beams and side walls of the corresponding earthwork are constructed.

[0027] Step S110: The shared diaphragm wall of the second and third structural areas and the construction platform slab are demolished, and the first structural area is excavated by open cut and the structure is constructed upwards in sequence.

[0028] The present invention provides a construction method for a combined structure of a subway station. The subway station is divided into multiple structural areas. First, the cut - and - cover method is used to form a frame structure under the road to ensure the road is quickly贯通 (again, assuming the correct word), and then the construction method is flexibly selected for each structural area, enabling the synchronous construction of the above - ground and underground structures, alleviating the technical problem in the prior art that the construction of the subway station配套 (the Chinese character here seems incorrect, assuming it should be '配套' which means'supporting') with the high - speed railway station is interfered with by the construction of other supporting facilities.

[0029] Specifically, step S102 further includes the following steps:

[0030] Step S1021: The road in the second structural area is closed, the diaphragm wall support structure under the road is constructed, and the top plate is closed to form a frame structure; among them, the diaphragm wall between subway stations serves as part of the side wall structure of the station and forms a composite wall with the side wall.

[0031] Step S1022: The earthwork is backfilled to complete the road construction in the second structural area.

[0032] Figure 3 This is a construction section view of the second structural area provided according to an embodiment of the present invention. Figure 4 This is a road section view of the second structural area provided according to an embodiment of the present invention. As Figure 3 shown, the top plate of the second structural area and the diaphragm wall form a frame structure and are constructed directly under the road to provide support for the road to ensure normal traffic on the road during subsequent construction.

[0033] Step S1023: The pile foundation and steel pipe column structure of the third structural area are constructed, and then the top - down inverse - construction top plate structure in the third structural area is constructed.

[0034] Figure 4 This is a schematic diagram of the top plate structure of the third structural area provided according to an embodiment of the present invention. As Figure 4 shown, the top plate of the third structural area is erected on the pile foundation and steel pipe columns. It should be noted that for some Chinese terms where there may be errors or unclear expressions in the original text, the translations are made based on possible correct interpretations.

[0035] Step S1024, after the concrete strength of the top plate structure and pile foundation of the third structure area reaches the first preset strength, the auxiliary structure on the top plate is constructed.

[0036] Figure 5 Fig. 3 is a schematic view of a third structure area top plate auxiliary structure according to an embodiment of the present application. As shown in Fig. 3, the third structure area top plate auxiliary structure is a two-story structure on the ground. Figure 5

[0037] Then the first structure area is excavated by the open excavation method, and after the open excavation reaches the design elevation, a small pilot tunnel is constructed in the area of the underground excavation, as shown in Fig. 4. Figure 6 Figure 6 Fig. 5 is a sectional view of a small pilot tunnel according to an embodiment of the present application.

[0038] Then the second structure area is constructed by the PBA construction method, and after the small pilot tunnel is penetrated, a station middle pile and a steel pipe column are constructed in the small pilot tunnel. Specifically, as shown in Fig. 6, Figure 7 Figure 7 Fig. 7 is a construction sectional view of a PBA construction method pile and column structure according to an embodiment of the present application. The physical meaning of the PBA construction method is: P-pile, B-beam, and A-arc, that is, the initial stress system is composed of side piles, middle piles (columns), top and bottom beams, and top arches, which bear the load during the construction process.

[0039] Specifically, step S108 further includes the following steps:

[0040] Step S1081, excavate the first layer of remaining soil in the second structure area, and construct the first layer of main structure bottom plate, cross beam, longitudinal beam, and side wall.

[0041] Step S1082, after the first layer of concrete reaches the second preset strength, excavate the second layer of soil in the second structure area, and construct the second layer of main structure bottom plate, longitudinal beam, cross beam, and side wall. As shown in Fig. 8, Figure 8 Figure 8 Fig. 9 is a completed sectional view of the second structure area underground excavation two-story construction according to an embodiment of the present application.

[0042] Step S1083, after the second layer of concrete reaches the third preset strength, excavate the third layer of soil in the second structure area and the third structure area synchronously, and construct the third layer of main structure bottom plate, longitudinal beam, cross beam, and side wall.

[0043] Step S1084, after the third layer of concrete reaches the fourth preset strength, excavate the fourth layer of soil in the second structure area and the third structure area synchronously, and construct the fourth layer of main structure bottom plate, longitudinal beam, cross beam, and side wall.

[0044] ​​​​Figure 9 is a second structure area and a first structure area construction completion cross-sectional view provided by an embodiment of the present application. As shown in Figure 9 , the second structure area adopts cover excavation + PBA construction method for construction, and the third structure area adopts cover excavation for construction.

[0045] Finally, after the main structure is completed, the second structure area and the third structure area public land connecting wall are removed, and the platform plate is constructed, and the open excavation first structure area is sequentially constructed upwards, as shown in Figure 10 and Figure 11 , wherein, Figure 10 is a three-layer cross-sectional view of the open excavation area to the first structure area provided by an embodiment of the present application, Figure 11 is an open excavation area construction completion cross-sectional view provided by an embodiment of the present application.

[0046] As can be known from the above description, the embodiment of the present application provides a construction method of a combined structure of a subway station, comprising: the first area is constructed by using an open excavation method, and simultaneously providing a working space for the second area; the second area road needs to be quickly connected, and a traffic network is formed with the surrounding roads, and a PBA method + cover excavation method is used for construction; the third area provides a construction access for the construction of the subway station and the auxiliary structure, and a cover excavation method is used for construction; and the fourth is an open excavation method + counter support, and is constructed synchronously with other supporting facilities. Compared with the prior art, the construction method of the combined structure of the subway station constructed by using the present application has the following advantages:

[0047] (1) The construction method can be flexibly selected according to the construction planning and the need of the road above the station to be opened to traffic. The cover excavation method is used to form a frame structure under the road, so as to ensure that the road is quickly connected; and the top plate is used as a supporting structure, thereby reducing the influence of excavation disturbance on road traffic.

[0048] (2) The construction access in the construction area caused by pit-in-pit excavation cannot be arranged. The cover excavation top-down method is used to form the top plate, piles, columns and other structures, which are used for the construction access of the auxiliary structure.

[0049] (3) The construction progress is accelerated, and the ground and underground structures can be constructed synchronously. The top plate above the top plate is constructed while the soil under the cover excavation area is excavated, thereby accelerating the construction progress.

[0050] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes are equivalent. Any modification, change, modification and modification of the above embodiment according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A construction method of a combined structure of a subway station, applied to a subway station; characterized in that, The subway station combined structure is longitudinally sequentially divided into a first structure area, a second structure area, a third structure area and a fourth structure area; wherein, the second structure area is a structure area directly below a road in the subway station; the subway station combined structure comprises four layers of structures; the method comprises: closing the road of the second structure area and constructing a road-under support structure; the road-under support structure comprises a second structure area top plate, a third structure area top plate and a road-under diaphragm wall support structure; adopting the open excavation method to construct the first structure area, after excavating the first structure area to a preset elevation, a small pilot tunnel is constructed in the underground excavation area; adopting the PBA construction method to construct the second structure area, after the small pilot tunnel is passed through, a middle pile and a steel pipe column of the subway station are constructed in the small pilot tunnel; synchronously excavating the lower strata of the second structure area and the third structure area, and constructing the main structure bottom plate, the longitudinal beam, the cross beam and the side wall corresponding to the earthwork; removing the shared diaphragm wall and the construction platform plate of the second structure area and the third structure area, and sequentially constructing the structures upwardly in the first structure area.

2. The method of claim 1, wherein, constructing the road-under support structure, comprising: closing the road of the second structure area, constructing the road-under diaphragm wall support structure and closing the top plate to form a frame structure; wherein, the underground continuous wall is made as part of the station side wall structure and forms a composite wall with the side wall; backfilling the earthwork to complete the road construction of the second structure area; constructing the pile foundation and the steel pipe column structure of the third structure area, and then constructing the top-down top plate structure in the third structure area; after the strength of the top-down top plate structure and the pile foundation base in the third structure area reaches a first preset strength, constructing the attached structure on the top plate.

3. The method of claim 1, wherein, synchronously excavating the lower strata of the second structure area and the third structure area, and constructing the main structure bottom plate, the longitudinal beam, the cross beam and the side wall corresponding to the earthwork, comprising: excavating the first layer of remaining earthwork in the second structure area, and constructing the first layer of main structure bottom plate, cross beam, longitudinal beam and side wall; after the strength of the first layer of concrete reaches a second preset strength, excavating the second layer of earthwork in the second structure area, and constructing the second layer of main structure bottom plate, longitudinal beam, cross beam and side wall; after the strength of the second layer of concrete reaches a third preset strength, synchronously excavating the third layer of earthwork in the second structure area and the third structure area, and constructing the third layer of main structure bottom plate, longitudinal beam, cross beam and side wall; after the strength of the third layer of concrete reaches a fourth preset strength, synchronously excavating the fourth layer of earthwork in the second structure area and the third structure area, and constructing the fourth layer of main structure bottom plate, longitudinal beam, cross beam and side wall.

Images