CN204457791U - A kind ofly meet the interim air channel structure that large-diameter shield first passes through subway station - Google Patents

Abstract

The utility model relates to a temporary air duct structure that meets the requirement that a large-diameter shield tunnel first passes through a subway station, which includes a vertical shaft, a pilot hole, a bored pile, a crown beam at the top of a pile, an air duct, a shield well and an air duct surrounding protection pile ; Wherein, the pilot hole is arranged horizontally and communicated with the shaft; the bottom of the pilot hole is provided with the bored pile; the pile top crown beam is poured on the top of the bored pile; the shield The well is arranged in the air duct and is located under the crown beam of the pile top; the air duct surrounding protection piles are located on both sides of the air duct. The utility model meets the requirement that the large-diameter shield first passes through the temporary air duct structure of the subway station, which can better solve the construction planning conflict between the tunnel in the subway section and the station. Independent of each other, the entire project planning is based on the interval tunnel as the main line, which can realize the goal of "hole opening" as soon as possible.

Description

A temporary air duct structure that satisfies the need for large-diameter shield tunnels to pass through subway stations first

【Technical field】

The utility model relates to a composition structure of a subway station, in particular to a temporary air duct structure for a large-diameter shield to pass through the subway station first, and belongs to the technical field of rail transit engineering.

【Background technique】

Large-diameter shield tunneling is used for tunnels and stations in the subway section, forming a single-hole and double-track tunnel at one time, and the stations are expanded and excavated on the basis of shield tunnels. This construction method and engineering planning can better solve the difficulties encountered in the current conventional subway engineering planning. However, this kind of project planning method generally requires the completion of the construction of the air duct structure at both ends of the station, the strengthening of the ring beam construction, and the reinforcement of the soil on the side wall of the air duct before the shield machine arrives at the station. conditions of.

However, the air duct is an underground excavation large-section high-side wall structure, the construction process is complicated, and the construction period is long. Due to the fast excavation speed of the shield machine, the construction of the air duct of the station is restricted by factors such as ground demolition and pipeline relocation. It is difficult to meet the shield receiving and starting conditions required by the design, and the shield tunneling speed can only be slowed down or waited after arriving at the station, which affects the shield construction efficiency and the realization of the "hole opening goal".

Therefore, in order to solve the above technical problems, it is indeed necessary to provide an innovative temporary air duct structure that allows the large-diameter shield to pass through the subway station first, so as to overcome the defects in the prior art.

【Content of utility model】

In order to solve the above problems, the purpose of this utility model is to provide a temporary air duct structure that meets the needs of large-diameter shields passing through subway stations first, which can be constructed after the large shields pass through the station first.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a temporary air duct structure that meets the needs of large-diameter shield tunnels passing through the subway station first, which includes shafts, pilot holes, bored piles, pile top crown beams, and air ducts. , shield wells and air duct surrounding protection piles; wherein, the pilot tunnel is set horizontally and communicates with the shaft; the bottom of the pilot tunnel is provided with the bored cast-in-place pile; The top of the cast-in-situ pile; the shield well is arranged in the air duct and is located below the crown beam of the pile top; the air duct surrounding protection piles are located on both sides of the air duct.

The temporary air channel structure of the utility model that satisfies the need for the large-diameter shield to pass through the subway station first is as follows: the diameter of the bored pile is 800 mm.

In the present invention, the temporary air duct structure satisfying that the large-diameter shield first passes through the subway station can also be: the air duct enclosing piles are vertically arranged at equal intervals.

Compared with the prior art, the utility model has the following beneficial effects: the utility model meets the requirement that the large-diameter shield first passes through the temporary air duct structure of the subway station, which can better solve the construction planning conflict between the tunnel in the subway section and the station, and the shield can directly Passing through the station air duct can ensure that the subway section tunnel and station construction planning are completely independent of each other. The entire project planning takes the section tunnel as the main line, and can realize the goal of "opening" as soon as possible.

【Description of drawings】

Fig. 1 is the construction drawing of step 1) of constructing the utility model.

Fig. 2 is the construction drawing of step 2) of constructing the utility model.

Fig. 3 is a structural schematic diagram of the temporary air duct structure of the utility model that satisfies the requirement that the large-diameter shield first passes through the subway station.

【Detailed ways】

Please refer to the accompanying drawing 1 of the specification. The utility model is a temporary air duct structure that meets the needs of large-diameter shield tunnels passing through subway stations first. , air duct 6, shield shaft 5 and air duct enclosure pile 7 and other parts.

Wherein, the pilot tunnel 2 is arranged horizontally and communicates with the vertical shaft 1 . The bored pile 3 is arranged at the bottom of the pilot hole 2 . The diameter of the bored pile 3 is 800mm.

The pile crown beam 4 is poured on the top of the bored pile 3 .

The shield well 5 is arranged in the air duct 6 and is located below the pile top crown beam 4 .

The air duct surrounding protection piles 7 are located on both sides of the air duct 6 and arranged vertically at equal intervals.

The construction method of the utility model that satisfies the large-diameter shield first passing through the temporary air duct structure of the subway station is as follows:

1), as shown in Figure 1, take the shaft 1 as the construction channel, open the horse head gate on the side wall of the shaft, and carry out grouting reinforcement to the soil at the horse head gate, and the three grids at the horse head gate are closely arranged . The small pilot tunnel 2 is excavated by the short step method, and the core soil is left. The step distance of each excavation is not greater than 0.75m. The soil in the arch part is reinforced by grouting with advanced small conduits, and the grouting grout is cement slurry. If the stratum contains water, it should be filled with cement-water glass double-fluid slurry;

2), as shown in Figure 2, the bored cast-in-place pile 3 is constructed in the pilot tunnel, and the diameter of the pile is 800mm, but the bored cast-in-place pile is not constructed in the pilot tunnel where the large-diameter shield crosses the air duct, and the bored pile is not constructed in the large-diameter shield tunnel. One drilled pile is added in each guide hole where the shield machine passes through the air duct, and the pile crown beam 4 is constructed in the small guide hole. Consider the load of the shield tunneling condition, and calculate the bending moment and shear force of the crown beam;

3), as shown in Figure 3, after the strength of the crown beam reaches the design strength, the large shield directly passes through the air duct 6 to form the shield well 5; after the large shield passes through, the earthwork excavation of the air duct 6 and the air duct Construction of enclosure pile 7.

The specific implementation above is only a preferred embodiment of this creation, and is not intended to limit this creation. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this creation should be included in this creation. within the scope of protection.

Claims (3)

1. meet the interim air channel structure that large-diameter shield first passes through subway station, it is characterized in that: comprise vertical shaft, pilot tunnel, bored pile, stake apical cap beam, air channel, shield structure well and air channel fender post; Wherein, described pilot tunnel is horizontally disposed with, and is communicated with vertical shaft; Described bored pile is provided with in the bottom of described pilot tunnel; Described stake apical cap beam builds the top in bored pile; Described shield structure well is arranged in air channel, and is positioned at a below for apical cap beam; Described air channel fender post is positioned at the both sides in air channel.

2. meet the interim air channel structure that large-diameter shield first passes through subway station as claimed in claim 1, it is characterized in that: the diameter of described bored pile is 800mm.

3. meet the interim air channel structure that large-diameter shield first passes through subway station as claimed in claim 1, it is characterized in that: the vertical arrangement equally of described air channel fender post.