Shield tunnel and mining tunnel underground docking method

Abstract

The invention discloses an underground docking method for a shield tunnel and a mining tunnel. The underground docking method comprises the following steps that the shield tunnel and the mining tunnel are oppositely excavated in two directions; when the distance between the two is 30 m, a first advance support guide pipe is arranged above the two; when the two bodies continue to advance to the distance of 20 m, a second advance support guide pipe is arranged above the two bodies in a driving mode; when the first advance support guide pipe and the second advance support guide pipe are continuously propelled to the distance of 10m, a third advance support guide pipe is arranged above the first advance support guide pipe and the second advance support guide pipe; advancing is continued, the section of the mining method tunnel is changed 2 m before the mining method tunnel makes contact with the shield method tunnel, and tunneling is stopped till a shield tunneling machine cutterhead makes contact with the tunnel face of the mining method tunnel; grouting reinforcement is conducted on the soil body of the triangular area below the third advance support guide pipe; the shield tunneling machine is dismantled, and a shell of the shield tunneling machine is left in the soil layer; and the cast-in-place tunnel is poured to complete tunnel construction. According to the method, connection between the shield tunnel and the mining tunnel can be achieved under the condition that the mining section is not enlarged.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a method for connecting a shield tunnel with a mining tunnel underground. Background Art

[0002] With the rapid development of urban rail transit projects, shield tunnels and mining tunnels are increasingly being used in construction. Shield tunnels have a fast excavation speed and high efficiency in soil layers, but in rock layers, the excavation speed is limited due to the high rock strength, and the shield machine cutterhead is damaged and needs to be frequently replaced. Mining tunnels can be constructed in rock layers by blasting and other methods, with a fast excavation speed, good overall stability of the rock layer, and low construction risk. However, mining tunnels in soil layers have a high construction risk due to poor soil stability, so they will not be used unless absolutely necessary.

[0003] When a section involves the soil-rock interface, the shield method is used in the soil layer and the mining method is used in the rock layer, and the two need to be connected, so there is a problem of the connection method, and the connection between the two is called "underground docking". The traditional treatment method is to expand the mining method tunnel to the extent that it can cover the shield machine and receive it in the mining method tunnel. The disadvantages of this treatment method are: 1) The expansion of the section increases the construction risk; 2) The expansion of the section increases the project cost. Summary of the invention

[0004] The purpose of the present invention is to provide a method for connecting a shield tunnel and a mining tunnel underground, which can achieve the connection between the shield tunnel and the mining tunnel without expanding the mining tunnel section, with low construction risk and low engineering cost.

[0005] In order to achieve the above object, the present invention adopts the following scheme:

[0006] A method for connecting a shield tunnel and a mining tunnel underground, comprising the following steps:

[0007] Step 1: The shield tunnel and the mining tunnel are excavated from two opposite directions respectively;

[0008] Step 2: When the shield tunnel and the mining tunnel are 30m apart, the first advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively;

[0009] Step 3: The shield tunnel and the mining tunnel continue to advance. When the shield tunnel and the mining tunnel are 20m apart, a second advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively.

[0010] Step 4: The shield tunnel and the mining tunnel continue to advance. When the shield tunnel and the mining tunnel are 10m apart, the third advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively.

[0011] Step 5: The shield tunnel and the mining tunnel continue to advance separately. The mining tunnel changes its cross section 2m before it contacts the shield tunnel, and stops excavating after the shield machine cutterhead contacts the mining tunnel face.

[0012] Step 6: In the mining tunnel, a grouting conduit is set up to reinforce the soil in the triangular area below the third advance support conduit by grouting;

[0013] Step 7: Under the protection of the first advance support conduit, the second advance support conduit, and the third advance support conduit, the cutter head of the shield machine and the internal equipment of the shield machine are dismantled;

[0014] Step 8, leaving the shield machine shell in the soil layer to serve as a supporting structure;

[0015] Step nine: pour the cast-in-place tunnel inside the shield machine shell, thus completing the tunnel construction.

[0016] As a preferred embodiment of the present invention, in step 2, the first advance support conduits on both sides are arranged in a staggered manner above the preset joint between the mining method tunnel and the shield machine.

[0017] As a preferred embodiment of the present invention, in step three, the second advance support guide tubes on both sides are staggeredly arranged above the preset joint between the mining method tunnel and the shield machine.

[0018] As a preferred embodiment of the present invention, in step 4, the third advance support guide tubes on both sides are staggeredly arranged above the preset joint between the mining method tunnel and the shield machine.

[0019] As a preferred embodiment of the present invention, in step five, when the cross-section of the shield tunnel and the cross-section of the mining tunnel are different, the outer contour of the joint takes the larger value of the cross-section of the shield tunnel and the cross-section of the mining tunnel, and the inner diameter of the joint takes the smaller value of the cross-section of the shield tunnel and the cross-section of the mining tunnel while meeting the driving requirements.

[0020] The method for connecting a shield tunnel and a mining tunnel underground provided by the present invention has the following beneficial effects compared with the prior art:

[0021] (1) The underground docking method of the present invention forms an effective cover by respectively setting up multiple advance support conduits above the mining tunnel and the shield machine in an inclined manner in the respective excavation directions, such as: the first advance support conduit, the second advance support conduit, and the third advance support conduit, to prevent the top soil from collapsing when the shield machine cutterhead is removed;

[0022] (2) The underground docking method of the present invention further ensures the stability of the top soil when the shield machine cutter head is removed by grouting the soil in the triangular area at the top of the tunnel face (i.e., the soil below the third advance support guide tube);

[0023] (3) The underground docking method of the present invention uses the shield machine casing as a supporting structure after the shield tunnel section and the mining tunnel are connected. The shield machine casing cannot be transported out and is protected by the shield machine casing to prevent the top soil from collapsing, making it convenient to cast the tunnel structure inside the shield machine casing.

[0024] In summary, the underground docking method of the present invention can achieve the connection between the shield tunnel and the mining tunnel without expanding the mining tunnel section, with low construction risk and low project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a longitudinal section diagram of the underground connection method of a shield tunnel and a mining tunnel provided by an embodiment of the present invention when the two are 30m apart;

[0026] Figure 2 It is Figure 1 A cross-sectional view of the AA position in the structure shown;

[0027] Figure 3 It is Figure 1 A cross-sectional view of the BB position in the structure shown;

[0028] Figure 4 It is a longitudinal section diagram of the underground connection method of a shield tunnel and a mining tunnel provided by an embodiment of the present invention when the two are 20m apart;

[0029] Figure 5 It is Figure 4 Cross-sectional view of the CC position in the structure shown;

[0030] Figure 6 It is a longitudinal section diagram of the underground connection method of a shield tunnel and a mining tunnel provided by an embodiment of the present invention when the two are 10m apart;

[0031] Figure 7 It is Figure 6 Cross-sectional view of the DD location in the structure shown;

[0032] Figure 8It is a longitudinal section diagram of the underground docking method of a shield tunnel and a mining tunnel provided by an embodiment of the present invention during docking;

[0033] Fig. 9 It is Figure 8 A cross-sectional view of the EE position in the structure shown;

[0034] Fig.10 It is a longitudinal section diagram of the underground connection method between a shield tunnel and a mining tunnel provided by an embodiment of the present invention after grouting reinforcement;

[0035] Fig.11 It is a longitudinal section diagram of the underground connection method between a shield tunnel and a mining tunnel provided by an embodiment of the present invention after the cast-in-place tunnel is cast;

[0036] Fig.12 It is Fig.11 Cross-sectional view of the FF position in the structure shown.

[0037] Reference numerals:

[0038] 1. Primary support of mine tunnel; 2. Secondary lining of mine tunnel; 3. Heading face of mine tunnel; 5. Shield machine casing; 6. Shield tunnel segments; 7. First advance support guide tube; 8. Second advance support guide tube; 9. Third advance support guide tube; 10. Cast-in-place tunnel; 11. Shield machine cutterhead; 12. Grouting guide tube; 13. Grouting reinforcement area. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] like Figures 1 to 12 As shown, an embodiment of the present invention provides a method for connecting a shield tunnel and a mining tunnel underground, which includes the following steps:

[0044] Step 1: The shield tunnel and the mining tunnel are excavated from two directions respectively; wherein, the shield tunnel is provided with a shield tunnel segment 6 and a shield machine, the shield machine is arranged on one side of the excavation direction and is used for tunnel excavation, and the shield machine includes a shield machine housing 5 and a shield machine cutter head 11; the mining tunnel is provided with a primary support 1 of the mining tunnel and a secondary lining 2 of the mining tunnel, and the section of the mining tunnel on one side of the excavation direction is a mining tunnel face 3;

[0045] Step 2: When the shield tunnel and the mining tunnel are 30 m apart, the first advance support guide tube 7 is respectively installed above the mining tunnel and the shield machine, tilted upward in their respective excavation directions;

[0046] Step 3: The shield tunnel and the mining tunnel continue to advance respectively. When the shield tunnel and the mining tunnel are 20m apart, a second advance support guide tube 8 is respectively driven upwards above the mining tunnel and the shield machine in an inclined manner in their respective excavation directions.

[0047] Step 4: The shield tunnel and the mining tunnel continue to advance respectively. When the shield tunnel and the mining tunnel are 10m apart, a third advance support guide pipe 9 is respectively driven upwards above the mining tunnel and the shield machine in an inclined manner in their respective excavation directions.

[0048] Step 5: The shield tunnel and the mining tunnel continue to advance respectively. The mining tunnel changes its cross section 2 m before it contacts the shield tunnel, and stops excavating after the shield machine cutter head 11 contacts the mining tunnel face.

[0049] Step 6: In the mining tunnel, a grouting conduit 12 is set up to grout the triangular area below the third advance support conduit 9 (see Fig.10 and Fig.11 The soil in the grouting reinforcement area 13) is reinforced by grouting;

[0050] Step 7: Under the protection of the first advance support conduit 7, the second advance support conduit 8, and the third advance support conduit 9, the shield machine cutter head 11 and the internal equipment of the shield machine are removed;

[0051] Step eight, leaving the shield machine casing 5 in the soil layer as a supporting structure;

[0052] Step nine: pouring the cast-in-place tunnel 10 inside the shield machine casing 5, thus completing the construction of the tunnel.

[0053] According to the underground connection method of the shield tunnel and the mining tunnel of the embodiment of the present invention, a plurality of advance support conduits are respectively set up above the mining tunnel and the shield machine, obliquely upward in their respective excavation directions, such as: the first advance support conduit 7, the second advance support conduit 8, and the third advance support conduit 9, to form an effective cover effect, which plays a role in preventing the top soil from collapsing when the shield machine cutter head 11 is removed; secondly, by grouting and reinforcing the soil in the top triangular area of ​​the mining tunnel face 3 (i.e., the soil below the third advance support conduit 9), the stability of the top soil when the shield machine cutter head 11 is removed is further ensured; furthermore, after the shield tunnel section and the mining tunnel are connected, the shield machine casing 5 cannot be transported out, and is used as a support structure. Under the protection of the shield machine casing 5, the top soil will not collapse, which facilitates the casting of the tunnel structure inside the shield machine casing 5. It can be seen that the underground docking method of the present invention can achieve the connection between the shield tunnel and the mining tunnel without expanding the mining tunnel section, with low construction risk and low project cost.

[0054] Furthermore, in order to make the support structure formed by the first advance support conduit 7, the second advance support conduit 8 and the third advance support conduit 9 more stable and reliable, in the step two, the first advance support conduits 7 on both sides are staggered above the preset joint between the mining method tunnel and the shield machine; in the step three, the second advance support conduits 8 on both sides are staggered above the preset joint between the mining method tunnel and the shield machine; in the step four, the third advance support conduits 9 on both sides are staggered above the preset joint between the mining method tunnel and the shield machine.

[0055] Furthermore, in step five, when the cross-section of the shield tunnel and the cross-section of the mining tunnel are different, the outer contour of the joint takes the larger value (i.e., the union) of the cross-section of the shield tunnel and the cross-section of the mining tunnel, and the inner diameter of the joint takes the smaller value (i.e., the intersection) of the cross-section of the shield tunnel and the cross-section of the mining tunnel while meeting the driving requirements.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for connecting a shield tunnel and a mining tunnel underground, characterized in that: The following steps are involved: Step 1: The shield tunnel and the mining tunnel are excavated from two opposite directions respectively; Step 2: When the shield tunnel and the mining tunnel are 30m apart, the first advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively; Step 3: The shield tunnel and the mining tunnel continue to advance. When the shield tunnel and the mining tunnel are 20m apart, a second advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively. Step 4: The shield tunnel and the mining tunnel continue to advance. When the shield tunnel and the mining tunnel are 10m apart, the third advance support guide tube is driven upwards in the direction of excavation above the mining tunnel and the shield machine respectively. Step 5: The shield tunnel and the mining tunnel continue to advance separately. The mining tunnel changes its cross section 2m before it contacts the shield tunnel, and stops excavating after the shield machine cutterhead contacts the mining tunnel face. Step 6: In the mining tunnel, a grouting conduit is set up to reinforce the soil in the triangular area below the third advance support conduit by grouting; Step 7: Under the protection of the first advance support conduit, the second advance support conduit, and the third advance support conduit, the cutter head of the shield machine and the internal equipment of the shield machine are dismantled; Step 8, leaving the shield machine shell in the soil layer to serve as a supporting structure; Step nine: pour the cast-in-place tunnel inside the shield machine shell, thus completing the tunnel construction.

2. The method for connecting a shield tunnel and a mining tunnel underground according to claim 1, characterized in that: In the step 2, the first advance support conduits on both sides are arranged in a staggered manner above the preset joint between the mining method tunnel and the shield machine.

3. The method for connecting a shield tunnel and a mining tunnel underground according to claim 1, characterized in that: In the step three, the second advance support guide tubes on both sides are arranged alternately above the preset joint between the mining method tunnel and the shield machine.

4. The method for connecting a shield tunnel and a mining tunnel underground according to claim 1, characterized in that: In the step 4, the third advance support guide tubes on both sides are arranged in a staggered manner above the preset joint between the mining method tunnel and the shield machine.

5. The method for connecting a shield tunnel and a mining tunnel underground according to claim 1, characterized in that: In step five, when the cross-section of the shield tunnel and the cross-section of the mining tunnel are different, the outer contour of the joint takes the larger value of the shield tunnel cross-section and the mining tunnel cross-section, and the inner diameter of the joint takes the smaller value of the shield tunnel cross-section and the mining tunnel cross-section while meeting the driving requirements.

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