CN204754945U - Mine method tunnel preliminary bracing lining cutting grid steel support make - Google Patents

Abstract

Under the premise of meeting the structural safety and structural requirements, the initial support lining grid steel frame structure of the mining method tunnel can effectively reduce the proportion of structural steel bars, reduce the weight per linear meter of the grid steel frame, and reduce project investment. Including the first main reinforcement chord, the second main reinforcement chord and the third main reinforcement chord arranged in a triangle on the cross section, the first main reinforcement chord and the second main reinforcement chord, the first main reinforcement chord and the third main reinforcement chord , The second main reinforcement chord and the third main reinforcement chord are overlapped to form a vertically extending grid steel frame.

Description

Primary support lining grid steel frame structure of mining method tunnel

technical field

The utility model relates to tunnel engineering, in particular to a grid steel frame suitable for the initial support lining of mine tunnels.

Background technique

At present, the mining method construction method is widely used in expressways, railways, and subway tunnels. It generally adopts a composite lining structure, which is composed of primary support immediately after excavation and secondary lining in the later stage.

As the main load-bearing structure in the construction stage, the primary support of mining method plays an important role in preventing the collapse of surrounding rock, restraining the deformation of surrounding rock, bearing the load of surrounding rock during construction and enhancing the durability of the structure. At present, the initial support is generally composed of section steel frame or steel grid steel frame and shotcrete; in areas with good geological conditions, steel grid steel frame is usually used. Rods, welded in combination into a grid form. Due to the relatively high proportion of steel bars in the structure of the four-chord grid steel frame, the traditional four-chord grid steel frame can be studied and optimized under the premise of meeting the structural safety and construction requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a mine tunnel initial support lining grid steel frame structure, which can effectively reduce the proportion of structural steel bars and reduce the single extension of the grid steel frame on the premise of meeting the structural safety and structural requirements. meter weight, reducing engineering investment.

The technical solution adopted by the utility model to solve its technical problems is as follows:

The utility model mine tunnel primary support lining grid steel frame structure is characterized in that it includes the first main reinforcement chord, the second main reinforcement chord and the third main reinforcement chord arranged in a triangle on the cross section, the first main reinforcement The vertically extending grid steel frame is formed by overlapping welded oblique bar steel bars between the chord bar and the second main bar chord bar, the first main bar chord bar and the third main bar chord bar, and the second main bar chord bar and the third main bar chord bar.

The beneficial effect of the utility model is that the main reinforcement chords are adjusted from four traditional ones to three, which can effectively reduce the proportion of structural steel bars, reduce the weight per linear meter of the grid steel frame, and reduce engineering investment.

Description of drawings

This manual includes the following six drawings:

Figure 1 is a cross-sectional view of the initial support lining grid steel frame structure of the utility model mine tunnel

Fig. 2 is the left view of the initial support lining grid steel frame structure of the utility model mine tunnel;

Fig. 3 is the right view of the initial support lining grid steel frame structure of the utility model mine tunnel;

Fig. 4 is a large sample diagram of the oblique bar reinforcement in the initial support lining grid steel frame structure of the utility model mine tunnel;

Fig. 5 is a large sample diagram of the stirrup in the initial support lining grid steel frame structure of the utility model mine tunnel;

Fig. 6 is a schematic diagram of the joints in the initial support lining grid steel frame structure of the mine tunnel of the utility model.

The figure shows component names and corresponding marks: the first main reinforcement chord 11a, the second main reinforcement chord 11b, the third main reinforcement chord 12, the inclined bar reinforcement 13, the stirrup 14, and the joint steel plate 15.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, Fig. 2 and Fig. 3, the primary support lining grid steel frame structure of the mining method tunnel of the present invention includes the first main reinforcement chord 11a, the second main reinforcement chord 11b and the first main reinforcement chord 11b arranged in a triangle on the cross section. Three main reinforcement chords 12, the first main reinforcement chord 11a and the second main reinforcement chord 11b, the first main reinforcement chord 11a and the third main reinforcement chord 12, the second main reinforcement chord 11b and the third main reinforcement chord 12 The grid steel frame extending vertically is formed by welding the oblique bar reinforcing bar 13. That is to say, the main reinforcement chord and the oblique rods connecting the main reinforcement chord are adjusted from the traditional 4 to 3, which can effectively reduce the proportion of structural reinforcement, reduce the weight per linear meter of the grid steel frame, and reduce the project investment.

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, stirrups 14 are vertically spaced on the grid steel frame, and each stirrup 14 is located at the first main reinforcement chord 11a, the second main reinforcement chord 11b and The outer side of the third main rib chord 12 is fixedly connected with it. Referring to Fig. 6, the vertical end of the grid steel frame is provided with a joint steel plate 15, and the joint steel plate 15 is connected with the longitudinal end of the first main reinforcement chord 11a, the second main reinforcement chord 11b and the third main reinforcement chord 12. Welding connection, bolt connection holes are arranged at intervals on the joint steel plate 15, and the grid steel frame sections are connected by bolts.

The above description is just to illustrate some principles of the initial support lining grid steel frame structure of the utility model mine method tunnel, not to limit the utility model to the specific structure and scope of application shown and described, so all Corresponding modifications and equivalents that may be utilized all belong to the patent scope of the utility model application.

Claims (3)

1. The primary support lining grid steel frame structure of the mine method tunnel, which is characterized by: including the first main reinforcement chord (11a), the second main reinforcement chord (11b) and the third main reinforcement chord arranged in a triangle on the cross section Rod (12), the first main reinforcement chord (11a) and the second main reinforcement chord (11b), the first main reinforcement chord (11a) and the third main reinforcement chord (12), the second main reinforcement chord (11b) and The third main reinforcement chords (12) are overlapped with welded inclined bar steel bars (13) to form a vertically extending grid steel frame. 2. The initial support lining grid steel frame structure of mine tunnel as claimed in claim 1, characterized in that: vertically spaced stirrups (14) are arranged on the grid steel frame, and each stirrup (14) is located at The outer sides of the first main reinforcement chord (11a), the second main reinforcement chord (11b) and the third main reinforcement chord (12) are fixedly connected thereto. 3. The mine method tunnel primary support lining grid steel frame structure as claimed in claim 1, characterized in that: the vertical end of the grid steel frame is provided with a joint steel plate (15), and the joint steel plate (15) It is connected with the longitudinal ends of the first main reinforcement chord (11a), the second main reinforcement chord (11b) and the third main reinforcement chord (12) through hole plug welding, and bolt connection holes are arranged at intervals on the joint steel plate (15).