Enclosed space shield counter-force frame and negative ring duct piece dismantling method

Abstract

The invention discloses a closed space shield counter-force frame and a negative ring duct piece dismounting method, and relates to the field of tunnel construction, and the method comprises the following steps: 1, before dismounting construction, a high-voltage cable is used as a sandbag for covering and a sleeve for protection, and is prevented from being crushed and damaged; 2, holes are formed in the positions of the 14 o'clock and the 2 o'clock from the-7 ring segment to the 0 ring segment one by one through a water drill to serve as mounting holes; 3, a chain block is installed on the top of the reaction frame, an auxiliary rope of the chain block is connected with an upper lifting lug of the cylinder inclined strut, and the upper end of the thin steel wire rope is connected with a tail hanging point of a battery car. According to the method, the construction scheme is flexibly adjusted according to the actual construction requirement, the problem can be effectively solved, the method adapts to the common complex environment in the in-hole construction, and it is guaranteed that tunnel construction is conducted in order.

Description

Technical Field

[0001] The invention belongs to the field of tunnel construction, and in particular relates to a method for removing a closed space shield reaction frame and a negative ring segment. Background Art

[0002] The shield tunnel of Jingguang section started from Hengfu Road Station and passed through Guangyuanxincun Station on the negative third level. This was because all the reserved lifting openings at the starting point had been blocked, and no lifting rings were reserved during the construction of the main structure of the middle plate on the negative second level of Guangyuanxincun Station.

[0003] Therefore, the overall dismantling of the reaction frame, the removal of the 7-ring negative ring segments and the 0-ring segments all need to be hoisted, dismantled and transported within the station. The station platform has already been implemented, and the dismantling space is small. It is impossible to implement large-scale dismantling equipment in the tunnel due to space conditions.

[0004] In order to solve this problem, we proposed a method for dismantling the reaction frame and negative ring segments of a closed space shield. Summary of the invention

[0005] Aiming at the problem that the station platform has been implemented, the demolition space is small, large-scale demolition equipment cannot be implemented in the tunnel, and the space conditions are limited, the present invention provides a closed space shield reaction frame and negative ring segment demolition method.

[0006] The solution adopted by the present invention to solve the technical problem is: a method for removing a closed space shield reaction frame and a negative ring segment, comprising the following steps: Step 1: Before dismantling the cables, cover them with sandbags and add casing to protect them from being damaged; Step 2: Use a water drill to drill holes at the 14 o'clock and 2 o'clock positions of the -7 ring segment to the 0 ring segment one by one to use as installation holes; Step 3: Install a hand chain hoist on the top of the reaction frame, connect the auxiliary rope of the hand chain hoist to the upper lifting lug of the cylindrical diagonal brace, connect the upper end of the thin steel wire rope to the tail hanging point of the battery car, and connect the lower end of the thin steel wire rope to the lower lifting lug of the cylindrical diagonal brace. Initially, the thin steel wire rope is in a tensioned state. Before the thin steel wire rope is tensioned, cut off the anchoring structure connecting the two ends of the cylindrical diagonal brace to the reaction frame and the ground; Step 4: After the cylindrical diagonal brace anchoring structure is cut, start to tension the thin steel wire rope, and at the same time operate the hand chain hoist to release the auxiliary rope. With the orderly cooperation of the hand chain hoist and the thin steel wire rope, the cylindrical diagonal brace is stably placed on the battery car, fixed firmly, pulled out of the platform, and vertically lifted to the well by the gantry crane at the station entrance; Step 5: Before removing the reaction frame, fix the two electric hoists to the installation holes of the -5 ring segment through the shackle A, one in front and one behind, respectively, connect the main ropes of the two electric hoists to the reserved hanging points on both sides of the upper part of the reaction frame, connect the upper end of the thick steel wire rope to the tail hanging point of the battery car, and pull the lower end of the thick steel wire rope to the bottom of the reaction frame. Initially, the thick steel wire rope is in a taut state; Step 6: First, cut off the anchoring structure at the bottom of the reaction frame, operate the battery car, use the thick steel wire rope to pull the reaction frame, move the reaction frame as a whole by 30cm, and separate the connection ring of the reaction frame from the -7 ring segment; Step 7: Switch the thick steel wire rope to the reserved hoisting hole on the top of the reaction frame, operate the electric hoist and the battery car respectively, place the reaction frame steadily on the ground, remove the connecting bolts, and hoist the reaction frame onto the battery car; Step 8: After the reaction frame is removed, the transition track in the negative ring is removed, and a stopper is set at the end of the track in the platform; Step 9: Before removing all the segments, remove the steel ropes, wooden wedges on both sides and anti-rotation tripods that reinforce the segments one by one; Step 10: Install shackle B in the installation hole of the -7 ring segment, and connect the main rope of the electric hoist to the shackle B. At this time, the main rope of the electric hoist is in a taut state; Step 11: Before removing the -7 ring segment, first remove the annular bolts between the -7 ring segment and the -6 ring segment in an orderly manner; Step 12: Connect the two ends of the thick steel wire rope to the tail hanging point of the battery car and the bolt hole at the bottom of the -7 ring segment respectively. Use the electric hoist to release the main rope first, and then use the battery car to pull it back to separate the -7 ring segment from the -6 ring segment as a whole, so that the -7 ring segment moves forward 30cm; Step 13: Transfer the thick steel wire rope at the bottom of the -7 ring segment to the top, operate the electric hoist and battery car in order to put the -7 ring segment on the ground steadily, remove the longitudinal connecting bolts, and put the -7 ring segment on the battery car; Step 14: Repeat the above steps to remove the -7 ring segment, and remove the -6 ring segment to the -2 ring segment one by one: Step 15: The -1 ring segment and the 0 ring segment are removed by combining the reserved battery car in the tunnel and the battery car outside the platform. The head of the battery car in the tunnel is connected to the rear fastener of the No. 6 trolley behind the shield machine. Two electric hoists are fixed to the installation holes of the -1 ring segment one after the other through the shackle A. The main ropes of the two electric hoists are connected to the rear pins of the dump truck in the tunnel respectively. The two ends of the thick steel wire rope are connected to the rear hanging point of the dump truck outside the platform and the bolt hole at the bottom of the -1 ring segment respectively. Step 16: Finally, use the method of dismantling the previous pipe segment to remove the remaining two rings of pipe segments one by one.

[0007] Preferably, the diameter of the mounting hole in step 2 is 100 mm.

[0008] Preferably, in the process of removing the reaction frame in step 7, waste tires or other materials are placed as a buffer pad where the platform falls.

[0009] Preferably, before removing the pipe segment in step 10, a connector is used to fix the inside of the pipe segment, and two horizontal supports are provided at the 12 o'clock and 4 o'clock positions of the pipe segment, and one support is provided at the front and rear of the pipe segment to prevent the pipe segment from losing its roundness during removal.

[0010] Preferably, the connecting piece is made of φ10 channel steel.

[0011] Preferably, the diameter of the thick steel wire rope is 28 mm, and the diameter of the thin steel wire rope is 16 mm.

[0012] Preferably, the maximum lifting capacity of the electric hoist is 25 tons, and the maximum lifting capacity of the hand hoist is 3 tons.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses an electric hoist and a hand hoist, and utilizes a battery vehicle equipped with a thin steel wire rope and a thick steel wire rope for traction, so as to dismantle the shield reaction frame and the negative ring segments in an orderly manner in the tunnel. This method flexibly adjusts the construction plan according to actual construction needs, can effectively solve the problem, adapts to the common complex environment in tunnel construction, and ensures the orderly progress of tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of dismantling the cylindrical diagonal brace of the present invention Figure 1 ; Figure 2 Schematic diagram of dismantling the cylindrical diagonal brace of the present invention Figure 2 ; Figure 3 Schematic diagram of dismantling the cylindrical diagonal brace of the present invention Figure 3 ; Figure 4 Schematic diagram of the removal of the reaction frame of the present invention Figure 1 ; Figure 5 Schematic diagram of the removal of the reaction frame of the present invention Figure 2 ; Figure 6 Schematic diagram of the removal of the reaction frame of the present invention Figure 3 ; Figure 7 Schematic diagram of the pipe segment removal of the present invention Figure 1 ; Figure 8 Schematic diagram of the pipe segment removal of the present invention Figure 2 ; Fig. 9 Schematic diagram of the pipe segment removal of the present invention Figure 3 ; Fig.10 Schematic diagram of the pipe segment removal of the present invention Figure 4 .

[0015] In the figure: 1 battery car, 2 temporary track, 3 thin steel wire rope, 4 cylindrical diagonal brace, 5 reaction frame, 7 hand chain hoist, 8 electric hoist, 9 pipe segment, 10 shackle B, 11 stopper, 12 thick steel wire rope, 13 dump truck in tunnel, 14 dump truck outside platform. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] See also Figure 1-10 The present invention provides a technical solution for a closed space shield reaction frame and a negative ring segment removal method: Embodiment 1: according to Figure 1-10 As shown, the following steps are included: Step 1: Before dismantling the cables, cover them with sandbags and add casing to protect them from being damaged; Step 2: Use a water drill to drill holes at the 14th and 2nd points of the -7 ring segment 9 to the 0 ring segment 9 one by one as mounting holes. The diameter of the mounting holes is 100 mm. Step 3: Install the hand chain hoist 7 on the top of the reaction frame 5, connect the auxiliary rope of the hand chain hoist 7 to the upper lifting lug of the cylindrical diagonal brace 4, connect the upper end of the thin steel wire rope 3 to the tail hanging point of the battery car 1, and connect the lower end of the thin steel wire rope 3 to the lower lifting lug of the cylindrical diagonal brace 4. Initially, the thin steel wire rope 3 is in a tensioned state. Before the thin steel wire rope 3 is tensioned, cut off the anchoring structure connecting the two ends of the cylindrical diagonal brace 4 with the reaction frame 5 and the ground; Step 4: After the anchoring structure of the cylindrical diagonal brace 4 is cut, the thin steel wire rope 3 is tensioned, and the hand chain hoist 7 is operated to release the auxiliary rope. Under the orderly cooperation of the hand chain hoist 7 and the thin steel wire rope 3, the cylindrical diagonal brace 4 is stably placed on the battery car 1, fixed firmly, pulled out of the platform, and vertically lifted to the well by the gantry crane at the station entrance; Step 5: Before removing the reaction frame 5, fix the two electric hoists 8 to the mounting holes of the -5 ring segment 9 through the shackles A, one in front and one behind, respectively, connect the main ropes of the two electric hoists 8 to the reserved hanging points on both sides of the upper part of the reaction frame 5, connect the upper end of the thick steel wire rope 12 to the tail hanging point of the battery car 1, and the lower end of the thick steel wire rope 12 pulls the bottom of the reaction frame 5. Initially, the thick steel wire rope 12 is in a tensioned state; Step 6: First, cut off the bottom anchoring structure of the reaction frame 5, operate the battery car 1, use the thick steel wire rope 12 to pull the reaction frame 5, move the reaction frame 5 as a whole by 30 cm, and separate the connection ring of the reaction frame 5 from the -7 ring segment 9; Step 7: Switch the thick steel wire rope 12 to the reserved hoisting hole on the top of the reaction frame 5, operate the electric hoist 8 and the battery car 1 respectively, place the reaction frame 5 stably on the ground, remove the connecting bolts, and lift the reaction frame 5 onto the battery car 1. During the removal of the reaction frame 5, waste tires and other materials are placed on the platform as a buffer pad; Step 8: After the reaction frame 5 is removed, the transition track in the negative ring is removed, and a stopper 11 is set at the end of the track in the platform; Step 9: Before removing all the segments 9, first remove the steel ropes, wooden wedges on both sides and anti-rotation tripods that reinforce the segments 9 one by one; Step 10: Use the connector to fix the inside of the segment 9, set two horizontal supports at the 12 and 4 o'clock positions of the segment 9, and set one at the front and back of the segment 9 to prevent the segment 9 from losing its roundness during removal. Install the shackle B10 in the installation hole of the -7 ring segment 9, and connect the main rope of the electric hoist 8 to the shackle B10. At this time, the main rope of the electric hoist 8 is in a tensioned state; Step 11: Before removing the -7 ring segment 9, first remove the annular bolts between the -7 ring segment 9 and the -6 ring segment 9 in order; Step 12: Connect the two ends of the thick steel wire rope 12 to the tail hanging point of the battery car 1 and the bolt hole at the bottom of the -7 ring segment 9 respectively, use the electric hoist 8 to release the main rope first, and then pull the battery car 1 backward to separate the -7 ring segment 9 from the -6 ring segment 9 as a whole, so that the -7 ring segment 9 moves forward 30cm; Step 13: Transfer the thick steel wire rope 12 at the bottom of the -7 ring segment 9 to the top, operate the electric hoist 8 and the battery car 1 in order to put the -7 ring segment 9 on the ground steadily, remove the longitudinal connecting bolts, and put the -7 ring segment 9 on the battery car 1; Step 14: Repeat the above steps of removing the -7 ring segment 9, and remove the -6 ring segment 9 to the -2 ring segment 9 one by one: Step 15: The -1 ring segment 9 and the 0 ring segment 9 are removed by combining the reserved battery car 1 in the tunnel and the battery car 1 outside the platform. The head of the battery car 1 in the tunnel is connected to the rear fastener of the No. 6 trolley behind the shield machine. Two electric hoists 8 are fixed to the installation holes of the -1 ring segment 9 one after the other through the shackle A. The main ropes of the two electric hoists 8 are respectively connected to the rear pins of the slag truck 13 in the tunnel, and the two ends of the thick steel wire rope 12 are respectively connected to the rear hanging point of the slag truck 14 outside the platform and the bottom bolt hole of the -1 ring segment 9; Step 16: Finally, the remaining two rings of segments 9 are removed one by one by using the method of dismantling the front segment 9.

[0018] Embodiment 2: Based on the first embodiment, the difference is as follows: the connecting piece is made of φ10 channel steel.

[0019] The diameter of the thick steel wire rope 12 is 28 mm, and the diameter of the thin steel wire rope 3 is 16 mm.

[0020] The maximum lifting capacity of the electric hoist 8 is 25 tons, and the maximum lifting capacity of the hand chain hoist 7 is 3 tons.

Claims

1. A method for removing a closed space shield reaction frame and negative ring segments, characterized in that: The following steps are involved: Step 1: Before dismantling the cables, cover them with sandbags and add casing to protect them from being damaged; Step 2: Use a water drill to drill holes at the 14 o'clock and 2 o'clock positions of the -7 ring segment to the 0 ring segment one by one to use as installation holes; Step 3: Install a hand chain hoist on the top of the reaction frame, connect the auxiliary rope of the hand chain hoist to the upper lifting lug of the cylindrical diagonal brace, connect the upper end of the thin steel wire rope to the tail hanging point of the battery car, and connect the lower end of the thin steel wire rope to the lower lifting lug of the cylindrical diagonal brace. Initially, the thin steel wire rope is in a tensioned state. Before the thin steel wire rope is tensioned, cut off the anchoring structure connecting the two ends of the cylindrical diagonal brace to the reaction frame and the ground; Step 4: After the cylindrical diagonal brace anchoring structure is cut, start to tension the thin steel wire rope, and at the same time operate the hand chain hoist to release the auxiliary rope. With the orderly cooperation of the hand chain hoist and the thin steel wire rope, the cylindrical diagonal brace is stably placed on the battery car, fixed firmly, pulled out of the platform, and vertically lifted to the well by the gantry crane at the station entrance; Step 5: Before removing the reaction frame, fix the two electric hoists to the installation holes of the -5 ring segment through the shackle A, one in front and one behind, respectively, connect the main ropes of the two electric hoists to the reserved hanging points on both sides of the upper part of the reaction frame, connect the upper end of the thick steel wire rope to the tail hanging point of the battery car, and pull the lower end of the thick steel wire rope to the bottom of the reaction frame. Initially, the thick steel wire rope is in a taut state; Step 6: First, cut off the anchoring structure at the bottom of the reaction frame, operate the battery car, use the thick steel wire rope to pull the reaction frame, move the reaction frame as a whole by 30cm, and separate the connection ring of the reaction frame from the -7 ring segment; Step 7: Switch the thick steel wire rope to the reserved hoisting hole on the top of the reaction frame, operate the electric hoist and the battery car respectively, place the reaction frame steadily on the ground, remove the connecting bolts, and hoist the reaction frame onto the battery car; Step 8: After the reaction frame is removed, the transition track in the negative ring is removed, and a stopper is set at the end of the track in the platform; Step 9: Before removing all the segments, remove the steel ropes, wooden wedges on both sides and anti-rotation tripods that reinforce the segments one by one; Step 10: Install shackle B in the installation hole of the -7 ring segment, and connect the main rope of the electric hoist to the shackle B. At this time, the main rope of the electric hoist is in a taut state; Step 11: Before removing the -7 ring segment, first remove the annular bolts between the -7 ring segment and the -6 ring segment in an orderly manner; Step 12: Connect the two ends of the thick steel wire rope to the tail hanging point of the battery car and the bolt hole at the bottom of the -7 ring segment respectively. Use the electric hoist to release the main rope first, and then use the battery car to pull it back to separate the -7 ring segment from the -6 ring segment as a whole, so that the -7 ring segment moves forward 30cm; Step 13: Transfer the thick steel wire rope at the bottom of the -7 ring segment to the top, operate the electric hoist and battery car in order to put the -7 ring segment on the ground steadily, remove the longitudinal connecting bolts, and put the -7 ring segment on the battery car; Step 14: Repeat the above steps to remove the -7 ring segment, and remove the -6 ring segment to the -2 ring segment one by one: Step 15: The -1 ring segment and the 0 ring segment are removed by combining the reserved battery car in the tunnel and the battery car outside the platform. The head of the battery car in the tunnel is connected to the rear fastener of the No. 6 trolley behind the shield machine. Two electric hoists are fixed to the installation holes of the -1 ring segment one after the other through the shackle A. The main ropes of the two electric hoists are connected to the rear pins of the dump truck in the tunnel respectively. The two ends of the thick steel wire rope are connected to the rear hanging point of the dump truck outside the platform and the bolt hole at the bottom of the -1 ring segment respectively. Step 16: Finally, use the method of dismantling the previous pipe segment to remove the remaining two rings of pipe segments one by one.

2. The closed space shield reaction frame and negative ring segment removal method according to claim 1 is characterized in that: The diameter of the mounting hole in step 2 is 100 mm.

3. The closed space shield reaction frame and negative ring segment removal method according to claim 1 is characterized by: In the process of removing the reaction frame in step 7, waste tires and other materials are placed at the platform landing point as a buffer pad.

4. The closed space shield reaction frame and negative ring segment removal method according to claim 1 is characterized in that: Before the segment is removed in step 10, the inside of the segment is fixed with connectors, and two horizontal supports are provided at the 12 o'clock and 4 o'clock positions of the segment, one at the front and one at the back of the segment, to prevent the segment from losing its roundness during removal.

5. The closed space shield reaction frame and negative ring segment removal method according to claim 4 is characterized in that: The connecting piece is made of φ10 channel steel.

6. The closed space shield reaction frame and negative ring segment removal method according to claim 1 is characterized in that: The diameter of the thick steel wire rope is 28 mm, and the diameter of the thin steel wire rope is 16 mm.

7. The closed space shield reaction frame and negative ring segment removal method according to claim 1 is characterized by: The maximum lifting capacity of the electric hoist is 25 tons, and the maximum lifting capacity of the hand hoist is 3 tons.

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