A method for underpinning construction of a subway station reserved crown beam

Abstract

The application discloses a kind of subway station reserved crown beam underpinning construction method, comprising the following steps: S1, the position of underpinning pile is determined between station main body and auxiliary pavilion structure at the enclosure pile or enclosure wall, by embedding lattice column in the enclosure pile or enclosure wall at the position, and pouring concrete, make enclosure pile or enclosure wall and lattice column jointly load bearing support crown beam, track beam and gantry crane;S2, when auxiliary pavilion structure construction, break part of enclosure pile or enclosure wall and lattice column outer concrete, so that the lattice column with lattice column top and bottom enclosure pile or enclosure wall of internal concrete forming power support is formed simultaneously, while the roof, floor construction between station main body and auxiliary pavilion structure;S3, after shield construction, cut the lattice column between roof and floor, complete the connection of roof and floor.The construction method of the application can reduce construction joint, reduce the risk of water leakage, while auxiliary pavilion and station main body shield construction is synchronized, improve the construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, more particularly to a metro station reserved crown beam underpinning construction method. BACKGROUND

[0002] At present, the population of most cities in China is increasing, and the urban traffic pressure is increasing, which promotes the rapid development of urban underground rail transit. As an important traffic tool for modern cities to alleviate the travel pressure of residents, the development potential of metro is huge, and the prospect is extremely broad. Convenient and fast metro has become the preferred traffic tool for residents.

[0003] The station and the interval are two important parts of the metro. The station is usually constructed by open excavation method, and the interval is constructed by shield method. The station main end well is usually used as the starting well of shield construction. After the main body of the station is constructed, shield construction and auxiliary structure construction are carried out, that is, the station auxiliary structure construction needs to be carried out at the same time as the shield construction. The station auxiliary wind pavilion structure has large span, and the bottom plate and the top plate of the wind pavilion structure need to be connected with the middle plate and the top plate of the station main body respectively. The connecting surrounding piles or walls need to be removed, and the crown beam at the top of the surrounding piles or walls needs to be reserved because the crown beam has a track beam and is needed for the operation of the shield construction gantry crane. Therefore, the surrounding piles or walls at the crown beam need to be underpinned. The underpinning is usually carried out by using Φ609x16 steel support. The underpinning method of the Φ609x16 steel support is as follows: the surrounding piles or walls at the underpinning position are removed first, and then the bottom plate and the top plate are connected and the steel support for underpinning is constructed. The top surface of the bottom plate and the bottom surface of the top plate need to be embedded with steel plates to be well connected with the underpinning steel support. The top surface of the top plate and the remaining piles below the crown beam need to be poured with concrete to form a force transmission. However, this method has the following problems: the structure plates at both ends of the steel support are poured first, forming many construction joints, which are easy to form water leakage channels; the shield construction needs to be interrupted during the installation of the underpinning structure, affecting the normal tunneling construction of the shield; and the steel support is difficult to remove in the later period, and the steel support at both ends often needs to be cut, which seriously damages the intact steel support.

[0004] Therefore, it is necessary to improve the underpinning structure and method in the prior art to solve the above problems. SUMMARY

[0005] The present application aims to disclose a metro station reserved crown beam underpinning construction method to solve the above technical problems, which can reduce construction joints and reduce the risk of water leakage; at the same time, the auxiliary wind pavilion structure is constructed synchronously with the main body of the station by shield construction, square lattice columns are used instead of circular steel supports, and the difficulty of removal, material damage and waste are reduced.

[0006] To achieve the above-mentioned purpose, the present application provides a metro station reserved crown beam underpinning construction method, comprising the following steps:

[0007] S1, determine the position of the underpinning pile between the station main body and the auxiliary wind pavilion structure at the enclosure pile or the enclosure wall, embed the lattice column in the enclosure pile or the enclosure wall at the position, and pour the concrete, so that the enclosure pile or the enclosure wall and the lattice column jointly bear the crown beam and the track beam arranged on the top of the crown beam and the gantry crane;

[0008] S2, when the auxiliary wind pavilion structure is constructed, break the concrete outside the enclosure pile or the enclosure wall and the lattice column outside the enclosure pile or the enclosure wall at the position of the underpinning pile, so that the lattice column with the concrete formed inside and the enclosure pile or the enclosure wall at the top and the bottom of the lattice column jointly form the force transmission support, and the top plate and the bottom plate between the station main body and the auxiliary wind pavilion structure are constructed;

[0009] S3, after the shield construction is completed, the lattice column between the top plate and the bottom plate is cut, and the connection between the top plate and the bottom plate of the station main body and the auxiliary wind pavilion structure is completed.

[0010] As a further improvement of the application, in the S1 step, the lattice column is installed inside the reinforcement cage in advance when the reinforcement cage of the enclosure pile is made, and the lattice column is lowered to the accurate position with the reinforcement cage.

[0011] As a further improvement of the application, in the S1 step, the two ends of the lattice column each exceed the top plate and the bottom plate of the auxiliary wind pavilion structure by 1m.

[0012] As a further improvement of the application, between the S2 and the S3 steps, further comprising:

[0013] The concrete outside the lattice column in the thickness range of the top plate and the bottom plate of the auxiliary wind pavilion structure is chiseled, the outer water stop steel plate arranged horizontally is welded on the outer wall of the lattice column in the thickness range of the top plate and the bottom plate, and then the concrete is poured between the top plate and the bottom plate of the station main body and the auxiliary wind pavilion structure.

[0014] As a further improvement of the application, in the S3 step, after the lattice column is cut, the concrete inside the lattice column in the thickness range of the top plate and the bottom plate is chiseled, the inner water stop steel plate is welded on the inner wall of the lattice column in the thickness range of the top plate and the bottom plate, and then the concrete is poured in the inside of the lattice column, and the connection between the top plate and the bottom plate of the auxiliary wind pavilion structure and the station main body is completed.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] (1) A metro station retaining crown beam underpinning construction method, square lattice columns are used instead of circular steel supports as underpinning structures at the positions of underpinning piles, on the one hand, the lattice columns are pre-buried in the retaining piles or retaining walls, when the auxiliary pavilion structure is constructed, only the retaining piles or retaining walls under the independent support of the crown beam need to be normally broken, so that the load on the crown beam is directly transferred to the lattice columns and the retaining piles or retaining walls under the lattice columns, without hoisting steel supports, thereby not affecting the shield construction, reducing the force transmission underpinning entity construction, reducing the construction risk, on the other hand, the cross section of the square lattice column is small, so that the length of the entire construction joint is reduced, by welding the inner and outer water stop steel plates of the lattice column, and using one-time pouring forming, the risk of water leakage is reduced; at the same time, only the outer steel shell at both ends of the lattice column needs to be cut off for the removal of the lattice column, compared with the circular steel support, it is easier to cut and remove.

[0017] (2) The underpinning construction method of the present application reduces the construction process, each operation is continuously carried out, improves the work efficiency, and after the lattice column is cut, the cut materials can be recycled, the amount of steel bars is reduced, and the like, thereby saving the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the arrangement of underpinning piles in the metro station retaining crown beam underpinning construction method of the present application;

[0019] Figure 2 It is a schematic diagram of the arrangement of underpinning piles in the metro station retaining crown beam underpinning construction method of the present application; Figure 1 It is a sectional view of A-A in the present application;

[0020] Figure 3 It is a schematic diagram of the front view of the lattice column in the metro station retaining crown beam underpinning construction method of the present application;

[0021] Figure 4 It is a schematic diagram of the front view of the lattice column in the metro station retaining crown beam underpinning construction method of the present application; Figure 3 It is a sectional view of B-B in the present application;

[0022] Figure 5 It is a schematic diagram of the connection between the lattice column and the inner and outer water stop steel plates in the metro station retaining crown beam underpinning construction method of the present application.

[0023] In the figure: 1, station main body; 2, auxiliary pavilion structure; 3, retaining pile; 4, lattice column; 5, crown beam; 6, track beam; 7, top plate; 8, bottom plate; 9, outer water stop steel plate; 10, inner water stop steel plate; 11, welding seam. DETAILED DESCRIPTION

[0024] The present application will be described in detail below with reference to the embodiments shown in the drawings, but it should be noted that these embodiments are not limiting to the present application, and equivalent transformations or substitutions of function, method or structure made by those skilled in the art according to these embodiments are within the scope of protection of the present application.

[0025] Please refer to Figures 1 to 5 A specific embodiment of a metro station retaining crown beam 5 underpinning construction method is shown.

[0026] A metro station retaining crown beam 5 underpinning construction method comprises the following steps: S1, determining the position of the underpinning pile between the station body 1 and the auxiliary pavilion structure 2, embedding the square lattice column 4 in the position of the retaining pile 3 or the retaining wall, and pouring concrete to make the retaining pile 3 or the retaining wall and the lattice column 4 jointly support the crown beam 5 and the track beam 6 and the gantry crane arranged on the top of the crown beam 5; in the S1 step, the lattice column 4 is installed in the steel reinforcement cage during the manufacture of the retaining pile 3, and the lattice column 4 is lowered to the accurate position with the steel reinforcement cage; the accurate position in the S1 step is that the two ends of the lattice column 4 each extend 1 m beyond the top plate 7 and the bottom plate of the auxiliary pavilion structure 2.

[0027] S2, during the construction of the auxiliary pavilion structure 2, breaking the concrete outside the retaining pile 3 or the retaining wall and the lattice column 4 outside the retaining pile 3 or the retaining wall except the position of the underpinning pile, so that the lattice column 4 with the concrete inside and the retaining pile 3 or the retaining wall at the top and bottom of the lattice column 4 jointly form a force transmission support, and the top plate 7 and the bottom plate between the station body 1 and the auxiliary pavilion structure 2 are constructed; after the S2 step, further comprising: chiseling the concrete outside the lattice column 4 within the thickness range of the top plate 7 and the bottom plate of the auxiliary pavilion structure 2, welding the outer water stop steel plate 9 arranged horizontally on the outer wall of the lattice column 4 within the thickness range of the top plate 7 and the bottom plate, and then pouring concrete between the top plate 7 and the bottom plate of the station body 1 and the auxiliary pavilion structure 2, wherein the outer water stop steel plate 9 is a rectangular frame structure, the inner edge of the rectangular frame is welded with the outer wall steel plate of the square lattice column 4, and then one-time pouring is adopted to reduce the risk of water leakage.

[0028] S3, after the shield construction is completed, the lattice column 4 between the top plate 7 and the bottom plate is cut to complete the connection between the top plate 7 and the bottom plate between the station body 1 and the auxiliary pavilion structure 2; wherein, the removal of the lattice column 4 only needs to cut off the outer steel shell at both ends of the lattice column 4, which is easier to cut than the circular steel support, and is convenient to remove, thereby avoiding the construction joint generated in the cutting process and affecting the sealing performance of the top plate 7 and the bottom plate.

[0029] In the S3 step, after the lattice column 4 is cut, the concrete inside the lattice column 4 in the thickness range of the top plate 7 and the bottom plate is chiseled out, the inner water-stop steel plate 10 is welded on the inner wall of the lattice column 4 in the thickness range of the top plate 7 and the bottom plate, the inside of the lattice column 4 is poured with concrete, and the connection between the auxiliary pavilion structure 2 and the top plate 7 and the bottom plate of the station main body 1 is completed. The inner water-stop steel plate 10 is of a special-shaped structure, has a circular hole in the center, as shown in FIG. 7, and the outer edge of the inner water-stop steel plate 10 and the steel plate of the lattice column 4 form a welding seam 11. Figure 5

[0030] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.​

Claims

1. A method for underpinning construction of a subway station reserved crown beam, characterized in that, The method comprises the following steps: S1, determining the position of the underpinning pile at the enclosure pile or enclosure wall between the station main body and the auxiliary pavilion structure, embedding the lattice column in the enclosure pile or enclosure wall at the position, and pouring concrete so that the enclosure pile or enclosure wall and the lattice column jointly bear the crown beam and the track beam arranged on the top of the crown beam and the gantry crane; S2, when the auxiliary pavilion structure is constructed, the concrete outside the lattice column is removed, the lattice column with the concrete inside is jointly formed with the enclosure pile or enclosure wall at the top and bottom of the lattice column to form a force transmission support, and the top plate and the bottom plate between the station main body and the auxiliary pavilion structure are constructed; the concrete outside the lattice column in the thickness range of the top plate and the bottom plate of the auxiliary pavilion structure is removed, the outer water stop steel plate is welded on the outer wall of the lattice column in the thickness range of the top plate and the bottom plate, and then the concrete is poured between the top plate and the bottom plate of the station main body and the auxiliary pavilion structure; S3, after the shield construction is completed, the lattice column between the top plate and the bottom plate is cut, the concrete inside the lattice column in the thickness range of the top plate and the bottom plate is removed after the cutting of the lattice column is completed, the inner water stop steel plate is welded on the inner wall of the lattice column in the thickness range of the top plate and the bottom plate, and then the concrete is poured in the inside of the lattice column to complete the connection between the top plate and the bottom plate of the station main body and the auxiliary pavilion structure.

2. The underpinning construction method of a reserved crown beam of a subway station according to claim 1, characterized in that, In the step S1, the lattice column is installed in the steel reinforcement cage in advance when the steel reinforcement cage of the enclosure pile is manufactured, and the lattice column is lowered to the accurate position with the steel reinforcement cage.

3. The underpinning construction method of a reserved crown beam of a subway station according to claim 2, characterized in that, In the step S1, the two ends of the lattice column each extend 1m beyond the top plate and the bottom plate of the auxiliary pavilion structure.

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