Synchronous construction method for tunnel transverse channel construction through TBM method

Abstract

The invention discloses a synchronous construction method for tunnel transverse channel construction through a TBM method, and the method comprises the following steps: 1) arranging a TBM construction ventilation pipeline, a water supply and drainage pipeline, a power supply communication cable and a continuous deslagging belt conveyor at the opposite side of a tunnel transverse channel, and arranging floating turnouts at the front part and the rear part of a construction area of the tunnel transverse channel; 2) processing a protective trolley; (3) excavating a special-shaped section at the connecting section of the transverse channel and the main tunnel on the protective trolley in a mode of combining drilling of a water milling drill and splitting; (4) a guide hole is formed in the middle section of the transverse channel through a raise boring machine; 5) reversely expanding the guide hole in the middle section of the transverse channel by using a reamer bit to form a blasting free face; by the adoption of the method, the transverse channel can be excavated and protected safely and effectively, influences on TBM ventilation, water supply and drainage, power supply communication, deslagging and normal operation of material transportation are avoided, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to a tunnel construction method, in particular to a method for synchronously constructing a tunnel transverse passage using a TBM method. Background Art

[0002] As the pace of national infrastructure construction continues to accelerate, infrastructure construction such as railways, highways and water conservancy has entered a stage of rapid development. Some long and large tunnels are designed as multiple tunnels arranged in parallel, and cross passages are set up between adjacent tunnels for connection. Traditional cross passage construction adopts drilling and blasting method, and the main tunnel section is suspended during the construction of the cross passage. When the TBM method is used to construct the tunnel, since the ventilation pipelines, water supply and drainage pipelines, power supply and communication cables, continuous slag conveyors and material transportation cannot be interrupted during TBM construction, the blasting and slag discharge operations of the cross passage will affect the normal operation of the TBM construction wind, water and electricity pipelines and slag discharge system, so the cross passage cannot be constructed on time. Most of the cross passage construction is concentrated after the tunnel is connected. For the construction of long and large tunnels, this also causes the extension of the project construction period. The cross passage cannot be constructed on time, which has a certain impact on the safety of tunnel construction during the construction period, and the tunnels cannot serve as each other's rescue emergency passages. Summary of the invention

[0003] The purpose of the present invention is to provide a method for synchronously constructing a cross-channel in a tunnel using the TBM method, which can effectively reduce the impact of cross-channel excavation on TBM wind, water, electricity pipelines and slag discharge systems.

[0004] The object of the present invention is achieved through such a technical solution, a method for synchronously constructing a tunnel cross passage by TBM method, the method comprising the following steps: 1) The TBM construction ventilation pipeline, water supply and drainage pipeline, power supply and communication cable and continuous slag conveyor are arranged on the opposite side of the tunnel cross passage, and floating turnouts are arranged in front and behind the construction area of ​​the tunnel cross passage; 2) Process the protective trolley and set the bracket and protective steel plate on the protective trolley; 3) Use a water-grinding drill on the protective trolley to drill holes and split the holes to excavate the special-shaped section at the junction of the cross passage and the main tunnel; 4) Use a raise borer to drill a guide hole in the middle section of the cross channel; 5) In the middle section of the transverse channel, use the reaming drill to reversely expand the guide hole to form a blasting free surface; 6) The remaining cross channel middle section is excavated and slag is removed by controlled blasting; 7) Construction of the cross passage is completed.

[0005] Among them, in the step 2), a transport passageway is set in the middle of the protection trolley, a bracket and a protection steel plate are set on the protection trolley, and the longitudinal length of the protection trolley is extended by at least 5m on both sides of the width of the transverse passage.

[0006] Further description, in the step 2), it also includes setting a transport passageway in the middle of the protection trolley; laying floating turnouts at the front and rear ends of the tunnel cross passage construction area; at the same time, the legs on both sides of the protection trolley are located on the backfill slag on both sides of the arch block, and the bottom longitudinal beam of the protection trolley is ship-shaped.

[0007] Among them, in the steps 3), 4) and 5), the excavation of the transverse channel includes the following steps: (1) excavating the irregular section at the joint by combining water-grinding drilling and splitting; (2) reverse drilling to make a guide hole; (3) reversely expanding the guide hole to form an open surface; (4) controlled blasting excavation of the middle section of the transverse channel.

[0008] For protection, a blasting protection net is required when blasting excavation is carried out between steps 5) and 6).

[0009] Among them, the blasting protection net is made as follows: anchor rods are installed around the opening of the cross passage, the entire length of the anchor rods is anchored with mortar, connecting rings are set at the ends of the anchor rods, and a flexible steel wire rope protection net is hung at the opening of the cross passage through the connecting rings at the ends of the anchor rods. The protection net has two layers, one layer is a 15×15cm main protection rope; the other layer is a 5×5cm secondary protection rope.

[0010] Due to the adoption of the above technical scheme, the present invention has the advantages of convenient construction and reliable use. It can be used to safely and effectively excavate and protect the transverse channel, avoid affecting the normal operation of TBM ventilation, water supply and drainage, power supply and communication, slag discharge and material transportation, improve construction efficiency and reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings of the present invention are as follows: Figure 1 This is a schematic diagram of synchronous construction of the transverse channel of the present invention; Figure 2 It is a schematic diagram of the step sequence of excavating a transverse channel of the present invention; Figure 3 This is a schematic diagram of the horizontal end surface of the synchronous construction of the horizontal channel of the present invention; Figure 4 This is a schematic diagram of the anchor point arrangement of the protection net of the present invention; Figure 5 It is a schematic diagram of the layout of the protection net of the present invention. DETAILED DESCRIPTION

[0012] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and any improvement or substitution based on the basic spirit of the present embodiment still falls within the scope of protection required by the claims of the present invention.

[0013] Example 1: Figure 1 , 2 As shown in Figure 3, a method for synchronously constructing a tunnel cross passage using a TBM method, the method comprising the following steps: 1) The TBM construction ventilation pipeline 3, water supply and drainage pipeline 5, power supply and communication cable 6 and continuous slag conveyor 4 are arranged on the opposite side of the tunnel cross passage, and floating turnouts are arranged in front and behind the construction area of ​​the tunnel cross passage; 2) Processing the protective trolley 10, and setting a bracket and a protective steel plate on the protective trolley; 3) Using a water-grinding drill to drill holes and split on the protection trolley 10, excavate the special-shaped section at the junction of the cross passage and the main tunnel; 4) Use a raise borer to drill a guide hole in the middle section of the cross channel; 5) In the middle section of the transverse channel, use the reaming drill to reversely expand the guide hole to form a blasting free surface; 6) The remaining cross channel middle section is excavated and slag is removed by controlled blasting; 7) Construction of the cross passage is completed.

[0014] Wherein, in the step 2), a transport passageway is provided in the middle of the protection trolley 10, a bracket 12 and a protection steel plate 13 are provided on the protection trolley 10, and the longitudinal length of the protection trolley 10 is extended by at least 5m on both sides of the width of the transverse passage.

[0015] Wherein, in the step 2), it also includes setting a transport passage door in the middle of the protection trolley 10, and setting rails 7 in the door, so that the rail locomotive 8 can pass in both directions through the door; Floating turnouts are installed at the front and rear ends of the tunnel cross passage construction area. During the cross passage slag discharge operation, another line can be used normally. With the floating turnouts installed at the front and rear, the transportation system in the tunnel can operate normally. At the same time, the legs on both sides of the protection trolley 10 are located on the backfill slag 9 on both sides of the inverted arch block 2. The bottom longitudinal beam of the protection trolley 10 is ship-shaped, and a rail locomotive can be used to move it forward and backward to facilitate on-site slag removal operations.

[0016] like Figure 2 As shown, in steps 3), 4) and 5), excavating the transverse channel includes the following steps: (1) excavating the irregular cross-section at the joint by combining water-grinding drilling and splitting; (2) making a guide hole by reverse drilling; (3) expanding the guide hole in the reverse direction to form an open surface; (4) excavating the middle section of the transverse channel by controlled blasting.

[0017] Since the main tunnel 1 of the TBM construction tunnel is a circular section, and the cross channel 21 and the main tunnel are connected with a special-shaped section, it is difficult to use the drilling and blasting method to construct this area. In addition, there is no safe space for blasting construction close to the main tunnel section, which will cause impact on the TBM wind, water, electricity pipelines and slag discharge system. The generated tunnel slag will be directly piled in the main tunnel 1, causing the TBM to be unable to operate normally. When excavating the middle section of the cross channel 21, since there is no open surface, it is necessary to make slot holes. During slot blasting, the rock blocks fly a long distance, posing a safety threat to the TBM wind, water, electricity pipelines and slag discharge system. For this reason, a cross channel excavation method combining water grinding drilling + reverse drilling + controlled blasting is selected. The 5m range from the main tunnel to the cross channel 21 is excavated 22 by water-grinding drilling + splitting method. The middle section of the cross channel 21 is firstly made with a raise drilling rig to make a guide hole 23, and then the reaming drill is used to reversely expand the guide hole 23 to about 1.5m as the blasting free surface 24, and then the controlled blasting method is used to excavate the middle section 25 of the cross channel. Since the free surface has been formed in the middle part of the section to be excavated, there is no need to make slot holes, which can effectively control the blasting rock blocks from flying out, avoiding affecting the TBM wind, water, electricity pipelines and slag discharge system.

[0018] like Figure 4 , 5 As shown, between the steps 5) and 6), a blasting protection net is required when blasting excavation is carried out. The blasting protection net is made as follows: anchor rods 15 are made around the opening of the horizontal passage 21, the anchor rods 15 are anchored with mortar throughout the entire length, a connecting ring 16 is set at the end of the anchor rod 15, and a flexible steel wire rope protection net is hung at the opening of the horizontal passage 21 through the connecting ring at the end of the anchor rod 15. The protection net has two layers, one layer is a 15×15cm main protection net 17; used to intercept rock blocks larger than 15cm in size; the other layer is a 5×5cm secondary protection net 18. Used to intercept rock blocks smaller than 15cm and larger than 5cm in size. Two left and right winches 20 are installed on the upper wall of the opening of the horizontal passage 21, and one end of the main rope 19 on the two layers of protection nets is rolled on the winch 20. By starting the winch 20, the protection nets 17 and 18 can be pulled up to facilitate subsequent slag removal operations. A bracket 12 and a 3mm thick protective steel plate 13 are set on the side of the protective trolley 10 facing the blasting impact of the transverse channel 21. The longitudinal length of the protective trolley 10 is extended by about 5m than the width of the transverse channel to ensure that all blasting rocks are intercepted. The sporadic rocks less than 5cm flying out from the secondary protective net 18 are intercepted by the protective steel plate 13 set on the protective trolley. Through the three-layer protection measures, classified interception can ensure that all the rocks flying out of the blasting are intercepted to avoid affecting the wind, water and electricity pipelines, transportation system and slag discharge system.

Claims

1. A method for synchronous construction of a tunnel cross passage by TBM method, characterized in that: The method comprises the following steps: 1) The TBM construction ventilation pipeline, water supply and drainage pipeline, power supply and communication cable and continuous slag conveyor are arranged on the opposite side of the tunnel cross passage, and floating turnouts are arranged in front and behind the tunnel cross passage construction area; 2) Process the protective trolley and set the bracket and protective steel plate on the protective trolley; 3) Use a water-grinding drill to drill holes and split on the protective trolley to excavate the special-shaped section at the junction of the cross passage and the main tunnel; 4) Use a raise borer to drill a guide hole in the middle section of the cross channel; 5) In the middle section of the transverse channel, use the reaming drill to reversely expand the guide hole to form a blasting free surface; 6) The remaining cross channel middle section is excavated and slag is removed by controlled blasting; 7) Construction of the cross passage is completed.

2. The method for synchronously constructing a tunnel transverse passage by TBM construction as claimed in claim 1, characterized in that: In the step 2), a transport passageway is provided in the middle of the protective trolley, a bracket and a protective steel plate are provided on the protective trolley, and the longitudinal length of the protective trolley is extended by at least 5m on both sides of the width of the transverse passage.

3. The method for synchronously constructing a tunnel transverse passage by TBM construction as claimed in claim 2, characterized in that: The step 2) also includes setting a transport passageway in the middle of the protection trolley; laying floating turnouts at the front and rear ends of the tunnel cross passage construction area; at the same time, the legs on both sides of the protection trolley are located on the backfill slag on both sides of the invert block, and the bottom longitudinal beam of the protection trolley is in a ship shape.

4. The method for synchronously constructing a tunnel transverse passage by TBM construction as claimed in claim 3, characterized in that In the steps 3), 4) and 5), the excavation of the transverse channel includes the following steps: (1) excavating the irregular cross-section at the joint by combining water-grinding drilling and splitting; (2) making a guide hole by reverse drilling; (3) expanding the guide hole in the reverse direction to form an open surface; (4) excavating the middle section of the transverse channel by controlled blasting.

5. The method for synchronous construction of a tunnel transverse passage by TBM construction as claimed in claim 4, characterized in that: Between steps 5) and 6), a blasting protection net is required when blasting excavation is carried out.

6. The method for synchronous construction of a tunnel transverse passage by TBM construction as claimed in claim 5, characterized in that: The blasting protection net is made as follows: anchor rods are installed around the opening of the cross passage, the entire length of the anchor rods is anchored with mortar, connecting rings are set at the ends of the anchor rods, and a flexible steel wire rope protection net is hung at the opening of the cross passage through the connecting rings at the ends of the anchor rods. The protection net has two layers, one layer is a 15×15cm main protection rope; the other layer is a 5×5cm secondary protection rope.

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