Supporting device for receiving shield in upper section of subway stack

Abstract

The utility model discloses a supporting device for shield receiving of a stacked upper section of a subway, which comprises the following steps: after normal receiving of a lower section is finished, receiving of the upper section is started, firstly, a plurality of steel supports are mounted at the bottom of a foundation pit, the steel supports are vertical supports, and the steel supports are used for bottom supporting from the bottom of a negative third layer to a top plate of the negative third layer; i-shaped steel is installed between the multiple steel supports, and a plugging plate is poured on the tops of the multiple steel supports; and the steel sleeve is installed on the plugging plate, bearing is carried out in a top supporting mode, and shield receiving is achieved. According to the supporting device for receiving the shield of the stacked upper section of the subway, the upper section and the lower section are supported in the mode that the blocking plate and the steel support are adopted for bearing, the problem that the bearing capacity of a middle plate of a main body structure is insufficient is solved, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield receiving for subway overlapping sections, and particularly relates to a supporting device for shield receiving in the upper overlapping section of a subway. Background Technique

[0002] During the construction of the upper and lower overlapping sections of the subway, in actual construction, some special terrains will be encountered. The distance between the tunnel edge and the bridge pile of the viaduct is relatively close, the distance between the tunnel portal and the bridge pile is relatively close, the terrain is relatively flat, the receiving vertical curves of the upper and lower sections are on the +2‰ vertical curve, and the horizontal curve is R-1500. The outside soil-facing surface of the diaphragm wall maintenance structure at the receiving end uses glass fiber bars, and the back soil-facing surface uses straight thread steel bars. When the shield is received, the straight thread steel bars on the back soil-facing surface of the portal need to be broken.

[0003] According to the comprehensive analysis of the geology, buried depth and surrounding environmental conditions, the receiving end site is restricted, the maximum load for shield receiving in the upper section is insufficient, and the bearing capacity of the middle slab of the main structure cannot meet the load requirements. Therefore, a supporting device for shield receiving in the upper overlapping section of the subway is designed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a supporting device for shield receiving in the upper overlapping section of the subway to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A supporting device for shield receiving in the upper overlapping section of the subway includes steel supports, connecting beams, plugging plates and steel sleeves. The connecting beams are used to connect several of the steel supports. I-beams are installed between several of the steel supports. The plugging plate is located on top of the steel supports, and the plugging plate is used to carry the steel sleeves;

[0007] Several steel supports are installed at the bottom of the foundation pit. The steel supports are vertical supports, and the steel supports perform bottom support from the bottom of the third basement floor to the top slab of the third basement floor;

[0008] I-beams are installed between several steel supports, and a plugging plate is cast on top of several steel supports. The plugging plate is located between the upper and lower overlapping sections of the subway;

[0009] The steel sleeves are installed on the plugging plates.

[0010] In the above-mentioned supporting device for shield receiving in the upper overlapping section of the subway, wherein: the steel sleeve is provided with four bases, including a first sleeve, a second sleeve, a third sleeve and a fourth sleeve. An end cover is installed at one end of the first sleeve of the steel sleeve, and a transition ring is installed at one end of the fourth sleeve of the steel sleeve.

[0011] The above-mentioned support device for shield receiving in the overlapping upper section of the subway, wherein: a patching plate is installed on the transition ring.

[0012] The above-mentioned support device for shield receiving in the overlapping upper section of the subway, wherein: in the upper section, temporary columns are provided on the sealing plate, and a reaction frame for providing reaction force during shield receiving is provided on the side of the temporary column away from the steel sleeve, and the I-beam is a double I-beam.

[0013] The technical effects and advantages of the present invention:

[0014] The present support device for shield receiving in the overlapping upper section of the subway can improve the construction efficiency: by adopting the method of using a sealing plate and steel supports between the upper section and the lower section for bearing, the problem of insufficient bearing capacity of the slab in the main structure is solved, allowing the shield machine to carry out receiving operations under large loads, and improving the construction efficiency. Brief Description of the Drawings

[0015] Figure 1 It is a schematic side sectional view of the support device for shield receiving in the overlapping upper section of the subway of the present invention;

[0016] Figure 2 It is a schematic top view of the support device for shield receiving in the overlapping upper section of the subway of the present invention;

[0017] Figure 3 It is a schematic side view of the steel sleeve in the support device for shield receiving in the overlapping upper section of the subway of the present invention.

[0018] In the figure: 1, steel support; 2, connecting beam; 3, I-beam; 4, sealing plate; 5, steel sleeve; 501, first sleeve; 502, second sleeve; 503, third sleeve; 504, fourth sleeve; 505, end cover; 506, transition ring; 507, patching plate; 6, reaction frame. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached Figures 1 - 3 , and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] Embodiment:

[0021] As Figures 1 - 3As shown in the figure, the utility model provides a support device for the shield receiving of the overlapping upper section of the subway, which includes steel supports 1, connecting beams 2, sealing plates 4 and steel sleeves 5. The connecting beam 2 is used to connect several of the steel supports 1. An I-beam 3 is installed between several of the steel supports 1. The sealing plate 4 is located at the top of the steel support 1, and the sealing plate 4 is used to bear the steel sleeve 5;

[0022] The specific support method is as follows:

[0023] S1: After the normal reception of the lower section is completed, the reception of the upper section starts. The maximum load for the shield reception of the upper section is about 970t, and the bearing capacity of the middle slab of the main structure cannot meet the load requirements. First, several steel supports 1 are installed at the bottom of the foundation pit. The steel supports 1 are vertical supports, and the steel supports 1 perform bottom support from the bottom of the third basement floor to the top slab of the third basement floor;

[0024] S2: An I-beam 3 is installed between several of the steel supports 1, and a sealing plate 4 is poured on the top of several of the steel supports 1. The sealing plate 4 is located between the upper section and the lower section of the subway overlap;

[0025] S3: The steel sleeve 5 is installed on the sealing plate 4, and the bearing is carried out by the jacking support method to realize the shield reception.

[0026] As a further improvement of the above technical solution:

[0027] In this embodiment, in step S3, the steel sleeve 5 is provided with four bases, including a first sleeve 501, a second sleeve 502, a third sleeve 503 and a fourth sleeve 504. Each base is 5m long and the effective width is 0.32m. Since a 360mm thick plain concrete cushion is provided under the base, the effective load-bearing area of the structure after stress diffusion is 56㎡. The steel sleeve 5 is installed with an end cover 505 at one end of the first sleeve 501, and the steel sleeve 5 is installed with a transition ring 506 at one end of the fourth sleeve 504, and a patch plate 507 is installed on the transition ring 506 to improve the sealing performance and stability of the steel sleeve.

[0028] In this embodiment, in step S3, before the steel sleeve 5 is reinforced, it is necessary to further verify the underground pipelines in the reinforcement area, protect the underground pipelines, and monitor the whole process during the construction to reduce the impact of the construction on the surrounding environment and protect the safety of underground facilities.

[0029] In this embodiment, in step S2, there are temporary columns on the sealing plate 4 in the upper section. There is a reaction frame 6 on the side of the temporary column far from the steel sleeve 5. A high-rigidity reaction frame 6 is adopted to ensure that all the horizontal thrust of the shield is borne by the reaction frame 6, prevent the steel sleeve from moving forward due to the influence of friction during the shield reception, and enhance the support strength.

[0030] In this embodiment, in step S2, the I-beam 3 is a double I-beam to enhance the stability of the structure.

[0031] The seal water-stop device uses a steel sleeve. MJS reinforcement is adopted at the end of the steel sleeve in the upper interval. The depth range of the MJS reinforcement is 8 - 28.1 m, the width range is 12 m, and the length outside the retaining structure is 3.4 m.

[0032] The support device for shield receiving in the overlapping upper interval of the subway can improve safety: By using the MJS reinforcement technology at the shield receiving end, the self-stability of the formation is enhanced, and the safety of shield receiving is improved. The depth range of the MJS reinforcement is 8 - 28.1 m, and the width range is 12 m, which helps to ensure the safe passage of the shield machine through the formation with greater risks.

[0033] The MJS reinforcement also helps to stabilize the soil around the receiving portal.

[0034] Strengthen the structure protection: When receiving the shield, the straight thread steel bars on the back soil surface of the portal need to be removed. The steel sleeve and MJS reinforcement measures adopted can avoid water and sand gushing during shield receiving.

[0035] Improve the construction efficiency: By using the method of plugging plate plus steel support between the upper interval and the lower interval for bearing, the problem of insufficient bearing capacity of the middle slab in the main structure is solved, allowing the shield machine to carry out receiving operations under large loads, and improving the construction efficiency.

[0036] Strengthen the monitoring and protection: The whole process is monitored during the construction, and the underground pipelines are protected when necessary, which helps to reduce the impact of the construction on the surrounding environment and protect the safety of underground facilities.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A support device for receiving a shield machine in a subway stacking section, characterized in that: include: A steel support (1), a connecting beam (2), a blocking plate (4) and a steel sleeve (5), wherein the connecting beam (2) is used to connect a plurality of the steel supports (1), an I-beam (3) is installed between the plurality of the steel supports (1), the blocking plate (4) is located on the top of the steel support (1), and the blocking plate (4) is used to bear the steel sleeve (5); A plurality of steel supports (1) are installed at the bottom of the foundation pit, wherein the steel supports (1) are vertical supports, and the steel supports (1) provide bottom support from the bottom of the negative third floor to the top plate of the negative third floor; I-beams (3) are installed between a plurality of steel supports (1), and a blocking plate (4) is cast on the top of the plurality of steel supports (1), wherein the blocking plate (4) is located between the upper section and the lower section of the subway stack; The steel sleeve (5) is mounted on the blocking plate (4).

2. A supporting device for receiving shield machines in the upper section of a subway according to claim 1, characterized in that: The steel sleeve (5) is provided with four bases, including a first sleeve (501), a second sleeve (502), a third sleeve (503) and a fourth sleeve (504); an end cover (505) is installed at one end of the first sleeve (501) of the steel sleeve (5); and a transition ring (506) is installed at one end of the fourth sleeve (504) of the steel sleeve (5).

3. The supporting device for receiving shield machines in the upper section of a subway according to claim 2, characterized in that: A patching plate (507) is installed on the transition ring (506).

4. The supporting device for receiving shield machines in the upper section of a subway according to claim 1 is characterized in that: A temporary column is provided on the blocking plate (4) in the upper section, and a reaction frame (6) for providing reaction force when receiving the shield is provided on the side of the temporary column away from the steel sleeve (5), and the I-beam (3) is a double-jointed I-beam.

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