CN111894627A - Construction method for graded dismantling of shield negative ring pipe piece - Google Patents
Construction method for graded dismantling of shield negative ring pipe piece Download PDFInfo
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- CN111894627A CN111894627A CN202010797270.5A CN202010797270A CN111894627A CN 111894627 A CN111894627 A CN 111894627A CN 202010797270 A CN202010797270 A CN 202010797270A CN 111894627 A CN111894627 A CN 111894627A
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 230000005641 tunneling Effects 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 230000008439 repair process Effects 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 239000002689 soil Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a construction method for graded dismantling of a shield negative ring pipe piece, which belongs to the technical field of underground construction, and comprises the following steps of firstly connecting the bottom of the negative ring pipe piece with a guide table through a rope body; carrying out anchor rod grouting construction operation on the positive ring segment; after the shield machine finishes the shutdown preparation, mounting support steel at the bottom of the negative ring pipe piece for reinforcement, and preparing a lifting appliance for disassembling the negative ring pipe piece; then the upper half ring of the negative ring pipe piece is removed, the negative 1 ring of the whole negative ring pipe piece is reserved, and the other negative ring pipe pieces are reserved at the bottom of 2-3 pipe pieces; after the secondary assembly of the equipment bridge of the shield machine is finished, a support rod is arranged between a negative ring pipe piece of the negative 1 ring and the counter-force frame; and finally, after the shield tunneling machine tunnels forwards and passes through the negative ring pipe piece provided with the supporting rod, the reaction frame and the rest negative pipe pieces are removed. According to the construction method for the graded dismantling of the shield negative ring pipe piece, when the negative ring pipe piece is dismantled, the transverse extrusion force between the negative ring pipe piece ring and the ring is reduced, and the safety risk is reduced.
Description
Technical Field
The invention belongs to the technical field of underground construction, and particularly relates to a shield negative ring pipe piece graded dismantling construction method.
Background
With the acceleration of the national urbanization construction process, when underground engineering construction is carried out, large-diameter shield construction is more and more favored due to the large excavation area and the convenient operation in the operation process, however, the starting site in the urban environment is often limited, the requirement of the whole assembly starting construction of the large-diameter shield machine cannot be met, and the split shield starting operation is mostly adopted. When the shield machine completely enters a hole and then carries out negative ring pipe piece dismantling, the construction efficiency of pipe piece hoisting and transportation can be greatly restricted when the shield machine completes shield assembly construction, the secondary shield assembly construction difficulty is increased in the assembly process, the construction period is prolonged, the construction cost is improved, therefore, the upper half ring of the negative ring needs to be dismantled in advance after the shield machine tunnels to an assembly position in the starting process, the whole assembly of the shield machine is completed, but a rear matching trolley is positioned under the negative ring pipe piece when the half ring on the negative ring pipe piece is dismantled, the shield machine enters the stratum to be short, the transverse extrusion force between the negative ring pipe piece ring and the negative ring is large, the dismantling process is complex under the influence of the self weight of the negative ring pipe piece and other factors, and the safety risk.
Disclosure of Invention
The invention aims to provide a shield negative ring pipe piece graded dismantling construction method, and aims to solve the problems that a rear matching trolley is positioned under a negative ring pipe piece when the negative ring pipe piece is dismantled, a shield machine enters a stratum to be short, the transverse extrusion force between the negative ring pipe piece ring and the negative ring pipe piece ring is large, the dismantling process is complex under the influence of factors such as the self weight of the negative ring pipe piece ring, and the like, and the safety risk is high.
In order to achieve the purpose, the invention adopts the technical scheme that: the shield negative ring pipe piece graded dismantling construction method comprises the following steps:
step 1, connecting the bottom of a negative ring canal sheet with a guide table through a rope body, and tensioning the rope body; carrying out anchor rod grouting construction operation on the positive ring segment, and arranging a plurality of anchor rods along the circumferential direction of the positive ring segment;
step 3, removing the upper half ring of the negative ring pipe piece, reserving the negative 1 ring of the whole negative ring pipe piece, and reserving 2-3 pipe pieces at the bottom of other negative ring pipe pieces;
step 4, assembling the equipment bridge of the shield machine for the second time;
step 5, arranging a support rod between the negative ring pipe piece of the negative 1 ring and the counterforce frame for reinforcing and supporting the negative ring pipe piece;
and 6, after the shield tunneling machine tunnels forwards to pass through the negative ring pipe piece provided with the supporting rod, the reaction frame and the rest negative pipe pieces are removed.
As another embodiment of the present application, after the support steel installation and the hanger preparation are completed, whether the support steel installation and the hanger are qualified is checked, if so, step 3 is performed, and if not, the repair is performed.
As another embodiment of the present application, a bolt grouting operation includes the steps of:
(1) drilling holes in the positive ring pipe piece, wherein the drilled holes lead to surrounding rocks outside the positive ring pipe piece;
(2) before grouting, lubricating a grouting pipeline by using water or dilute cement slurry and blowing a drilled hole completely;
(3) grouting the drilled hole, and arranging cement paper at the hole opening, wherein the cement paper is used for blocking the hole opening;
(4) the anchor rod is in place at the orifice, the cement paper is lifted and the anchor rod is driven into place quickly.
As another embodiment of the application, the driving depth of the anchor rods on 2-3 segments at the bottom of the positive ring segment is greater than that of the anchor rods of the rest segments of the positive ring segment.
As another embodiment of the application, the guide platform is provided with a hanging ring, the negative ring pipe piece is provided with a connecting hole, and the rope body penetrates through the hanging ring on the guide platform to be connected.
As another embodiment of this application, the support steel includes first support steel and second support steel, and the slope of first support steel is located with negative ring section of jurisdiction bottom both sides, and is located the rope body outside, and the second support steel is located under the bottom of negative ring section of jurisdiction, and links to each other with the negative ring section of jurisdiction.
As another embodiment of the application, a through hole is formed in the segment of the negative ring segment, a screw rod penetrates through the through hole, a shackle is arranged on the screw rod, a hoisting hole is formed in the shackle, nuts are connected to two ends of the screw rod, and the screw rod and the shackle are limited through the nuts.
As another embodiment of this application, bracing piece one end links to each other with the first half burden ring section of jurisdiction of burden 1 ring, and the other end links to each other with the reaction frame, and the bracing piece is laid along the circumferencial direction looks interval of burden ring section of jurisdiction.
As another embodiment of this application, the bracing piece passes through the supporting seat and links to each other with the burden ring section of jurisdiction.
As another embodiment of the application, the supporting seat is provided with a bottom plate, two L-shaped angle plates are arranged on the bottom plate, the two angle plates are symmetrically arranged, and the supporting rod is erected between the two angle plates.
The shield negative ring pipe piece graded dismounting construction method provided by the invention has the beneficial effects that: compared with the prior art, the shield negative ring duct piece graded demolition construction method has the advantages that anchor rod grouting is carried out on positive ring duct pieces before the negative ring duct pieces are demolished, the tunnel lining duct pieces are tightly connected with surrounding soil bodies, so that the extrusion force between the negative ring duct pieces in the circumferential direction is effectively reduced, the lower half parts of the negative ring duct pieces are connected and fastened with the guide table through the rope body, and the mounting support steel of the lower half parts of the negative ring duct pieces is reinforced, so that the safety risks such as warping and the like caused by the action of the pushing force of the bottom of the negative ring duct pieces on the lower part of the shield machine after the upper parts; after the upper half part of the negative ring pipe piece is removed, the supporting rod is arranged between the reaction frame and the negative ring pipe piece without removing the upper half part, so that enough reaction force is provided for the secondary pushing of the shield tunneling machine, the risk is reduced and the construction safety is ensured while the disassembly and assembly are completed in a limited space.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a shield negative ring pipe piece graded demolition construction method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a negative ring segment according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a grouting installation of a rock bolt provided by an embodiment of the invention;
FIG. 4 is a schematic view of a bottom reinforcing structure of a negative loop plate according to an embodiment of the present invention;
fig. 5 is a schematic view of a connection structure for hoisting and dismounting a negative ring pipe piece according to an embodiment of the present invention;
FIG. 6 is a schematic view of a support bar mounting structure according to an embodiment of the present invention;
fig. 7 is a schematic view of a supporting seat structure according to an embodiment of the present invention.
In the figure: 1. sealing the top block; 2. an abutting block; 3. a standard block; 4. an anchor rod; 6. a first support steel; 7. a wire rope; 8. a guide table; 9. a second support steel; 10. a screw; 11. shackle dismounting; 12. a nut; 13. a gasket; 14. a negative ring segment; 15. a support bar; 16. a reaction frame; 17. a supporting seat; 1701. a base plate; 1702. a gusset is provided.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, the construction method for graded removal of the shield negative ring segment 14 according to the present invention will now be described. The construction method for graded removal of the shield negative ring segment 14 comprises the following steps:
step 1, connecting the bottom of a negative ring duct piece 14 with a guide table 8 through a rope body 7, and tensioning the rope body 7; grouting anchor rods 4 to the positive ring segment, and arranging a plurality of anchor rods 4 along the circumferential direction of the positive ring segment;
step 3, removing the upper half ring of the negative ring pipe piece 14, reserving the negative 1 ring of the whole negative ring pipe piece 14, and reserving 2-3 pipe pieces at the bottom of other negative ring pipe pieces 14;
step 4, assembling the equipment bridge of the shield machine for the second time;
step 5, arranging a support rod 15 between the negative ring pipe piece 14 of the negative 1 ring and the reaction frame 16 for reinforcing and supporting the negative ring pipe piece 14;
and 6, after the shield tunneling machine tunnels forwards and passes through the negative ring segment 14 provided with the support rod 15, the reaction frame 16 and other negative segments are removed.
Compared with the prior art, the construction method for graded removal of the shield negative ring segment 14 provided by the invention has the advantages that the anchor rods 4 are grouted on the positive ring segment before the negative ring segment 14 is removed, the tunnel lining segment is tightly connected with the surrounding soil body, so that the extrusion force between the circumferential directions of the negative ring segment 14 is effectively reduced, the lower half part of the negative ring segment 14 is connected and fastened with the guide table 8 through the rope body 7, and the mounting support steel at the lower half part of the negative ring segment 14 is reinforced, so that the safety risks such as warping and the like caused by the action of the pushing force at the lower part of the shield machine at the bottom of the negative ring segment 14 after the upper part of the; after the upper half part of the negative ring pipe piece 14 is removed, the supporting rod 15 is arranged between the reaction frame 16 and the negative ring pipe piece 14 without the upper half part removed, so that enough reaction force is provided for secondary pushing of the shield tunneling machine, the dismounting and mounting are completed in a limited space, the risk is reduced, and the construction safety is ensured.
The negative ring segment 14, also called a temporary segment, is installed between the reaction frame 16 and the shield jack when the shield is started, and the ring segment can provide forward propelling force for the shield machine to tunnel. When the shield starts, in a starting working shaft, a reaction frame 16 is arranged at the rear end of the shield machine, a negative annular duct piece is arranged between the reaction frame 16 and a shield jack, so that the forward propelling acting force is applied to the shield machine until a shield tail of the shield mechanism enters a hole on the other side of a well wall, and a distance is tunneled forwards, so that the friction force between a stratum and a positive annular duct piece can offset the reaction force generated by the propelling of the shield machine, and at the moment, a temporary duct piece between the reaction frame 16 and the shield tail completes the mission and can be removed.
The negative ring pipe piece 14 is 10 rings, and the 10 negative ring pipe pieces 14 are sequentially arranged in an attaching mode. The positive ring segment is identical in structure to the negative ring segment 14. The structure of the negative ring pipe piece 14 is taken as an example for description, and the full ring of the negative ring pipe piece 14 is composed of 9 pipe pieces including 1 top sealing block 1, 2 adjacent blocks 2 and 6 standard blocks 3. In this embodiment, anchor rod 4 grouting is carried out on the positive ring duct piece before negative ring duct piece 14 is dismantled, the strength of the positive ring duct piece is improved, thereby closely connecting the tunnel lining duct piece with the surrounding soil body and effectively reducing the extrusion force between the negative ring duct piece 14 rings.
In this embodiment, the guide station 8 is a shield originating guide station.
As a specific embodiment of the construction method for graded removal of the shield negative ring segment 14 provided by the invention, please refer to fig. 1, after the support steel installation and the hanger preparation are completed, whether the support steel installation and the hanger are qualified is checked, if so, step 3 is performed, and if not, the repair is performed.
In this embodiment, the construction method for graded removal of the shield negative ring segment 14 includes the following steps:
step 1, connecting the bottom of a negative ring duct piece 14 with a guide table 8 through a rope body 7, and tensioning the rope body 7; grouting anchor rods 4 to the positive ring segment, and arranging a plurality of anchor rods 4 along the circumferential direction of the positive ring segment;
Step 3, removing the upper half ring of the negative ring pipe piece 14, reserving the negative 1 ring of the whole negative ring pipe piece 14, and reserving 2-3 pipe pieces at the bottom of other negative ring pipe pieces 14;
step 4, assembling the equipment bridge of the shield machine for the second time;
step 5, arranging a support rod 15 between the negative ring pipe piece 14 of the negative 1 ring and the reaction frame 16 for reinforcing and supporting the negative ring pipe piece 14;
and 6, after the shield tunneling machine tunnels forwards and passes through the negative ring segment 14 provided with the support rod 15, the reaction frame 16 and other negative segments are removed.
Referring to fig. 1 to 3, as a specific embodiment of the present invention, a grouting operation of the anchor 4 includes the following steps:
(1) drilling holes in the positive ring pipe piece, wherein the drilled holes lead to surrounding rocks outside the positive ring pipe piece;
(2) before grouting, lubricating a grouting pipeline by using water or dilute cement slurry and blowing a drilled hole completely;
(3) grouting the drilled hole, and arranging cement paper at the hole opening, wherein the cement paper is used for blocking the hole opening;
(4) the anchor 4 is in position at the aperture and the cement paper is lifted and the anchor 4 is quickly driven into position.
As a specific implementation manner of the embodiment of the invention, please refer to fig. 1 to 3, the driving depth of the anchor rods 4 on 2-3 segments at the bottom of the positive ring segment is greater than that of the anchor rods 4 on the rest segments of the positive ring segment.
In the embodiment, after the shield machine starts to enter the tunnel door, grouting operation of the anchor rod 4 is performed while tunneling, and the construction process of the anchor rod 4 is determined according to the construction process, surrounding rock conditions, adopted equipment and other factors. Every ring positive ring section of jurisdiction processes 25 drilling, 1 drilling of block of capping, 3 drilling of all processing of adjacent block 2 and piece standard block 3. The anchor rod 4 is squeezed into from the orifice of the drilling hole of the positive ring segment, the depth of the segment anchor rod 4 above the positive ring segment is 4m, the depth of the segment anchor rod 4 below is 6m, and then the movable trolley is used for drilling the next positive ring segment.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 4, the guide platform 8 is provided with a hanging ring, the negative ring segment 14 is provided with a connecting hole, and the rope body 7 passes through and is connected with the hanging ring on the guide platform 8.
In this embodiment, the rope body 7 is a steel wire rope, the steel wire rope passes through the connecting hole, and both ends of the steel wire rope are connected with the hanging rings on the guide table 8, so that the steel wire rope is adjusted to be in a tight state and the negative ring duct piece 14 is tensioned.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 4, the support steels include first support steels 6 and second support steels 9, the first support steels 6 are obliquely disposed on two sides of the bottom of the negative ring segment 14 and are disposed outside the rope body 7, and the second support steels 9 are disposed right below the bottom of the negative ring segment 14 and are connected to the negative ring segment 14.
In this embodiment, first support steel 6 is the I-steel, and a plurality of second support steel 9 erect and establish the H type and support and locate negative ring section of jurisdiction 14 bottom, consolidate the support to negative ring section of jurisdiction 14.
In this embodiment, after the shield machine starts entering the tunnel door, the grouting operation of the anchor rod 4 is performed while tunneling, after the grouting of the anchor rod 4 is completed, the shield machine stops, the first support steel 6 and the second support steel 9 are installed for reinforcement, and after the installation of the first support steel 6 and the second support steel 9 is completed, the steel wire rope is detached.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 5, a through hole is formed on a negative ring segment 14, a screw rod 10 is inserted into the through hole, a shackle 11 is arranged on the screw rod 10, a hoisting hole is arranged on the shackle 11, nuts 12 are connected to both ends of the screw rod 10, and the screw rod 10 and the shackle 11 are limited by the nuts 12.
In this embodiment, be equipped with gasket 13 between break-out 11 and section of jurisdiction, demolish the section of jurisdiction that needs to dismantle when the section of jurisdiction is dismantled and the connection structure between adjacent section of jurisdiction, then hoist and the hole for hoist on the break-out 11 link to each other, dismantle the section of jurisdiction.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 6 to 7, one end of the support rod 15 is connected to the upper half negative ring segment 14 of the negative 1 ring, the other end is connected to the reaction frame 16, and the support rods 15 are arranged at intervals along the circumferential direction of the negative ring segment 14.
In this embodiment, treat that equipment bridge secondary assembly is accomplished, the shield constructs the machine and continues to advance forward, for preventing that the shield constructs quick-witted jack upper portion hydro-cylinder from pushing the in-process, the first half section of jurisdiction of the negative ring section of jurisdiction 14 that does not demolish takes place to remove backward because of the atress, arouses the potential safety hazard, sets up bracing piece 15 at the piece of the negative ring section of jurisdiction 14 of burden 1 ring and reaction frame 16, makes the support firm.
In this embodiment, the support rod 15 is also called steel support in practical application, and the support rod 15 sets up 5, and the support rod 15 is evenly distributed along the circumferencial direction on the first half negative ring segment 14 of burden 1 ring for the atress is more even.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 6 to 7, the support rod 15 is connected to the negative ring segment 14 through the support seat 17.
Referring to fig. 6 to 7, as an embodiment of the present invention, the supporting base 17 is provided with a bottom plate 1701, the bottom plate 1701 is provided with two L-shaped angle plates 1702, the two angle plates 1702 are symmetrically arranged, and the supporting rod 15 is erected between the two angle plates 1702. The supporting seat 17 is simple and convenient to manufacture, low in cost and more convenient for installation of the supporting rod 15.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The shield negative ring pipe piece graded dismantling construction method is characterized by comprising the following steps:
step 1, connecting the bottom of a negative ring canal sheet with a guide table through a rope body, and tensioning the rope body; carrying out anchor rod grouting construction operation on the positive ring segment, and arranging a plurality of anchor rods along the circumferential direction of the positive ring segment;
step 2, completing shutdown preparation of the shield machine, installing support steel at the bottom of the negative ring duct piece for reinforcement, and preparing a lifting appliance for disassembling the negative ring duct piece;
step 3, removing the upper half ring of the negative ring pipe piece, reserving the negative 1 ring of the whole negative ring pipe piece, and reserving 2-3 pipe pieces at the bottom of other negative ring pipe pieces;
step 4, assembling the equipment bridge of the shield machine for the second time;
step 5, arranging a support rod between the negative ring pipe piece of the negative 1 ring and the counterforce frame for reinforcing and supporting the negative ring pipe piece;
and 6, after the shield tunneling machine tunnels forwards to pass through the negative ring pipe piece provided with the supporting rod, the reaction frame and the rest negative pipe pieces are removed.
2. The shield negative ring pipe piece graded demolition construction method according to claim 1, wherein after the support steel installation and the hanger preparation are completed, whether the support steel installation and the hanger are qualified is checked, if so, the step 3 is performed, and if not, the repair is performed.
3. The shield-driven negative-loop pipe sheet graded demolition construction method according to claim 1, wherein the anchor rod grouting operation comprises the steps of:
(1) drilling holes in the right-ring segment, wherein the drilled holes lead to surrounding rocks outside the right-ring segment;
(2) before grouting, lubricating a grouting pipeline by using water or dilute cement slurry and blowing a drilled hole completely;
(3) grouting the drilled hole, and arranging cement paper at the hole opening, wherein the cement paper is used for blocking the hole opening;
(4) the anchor rod is in place at the orifice, the cement paper is lifted and the anchor rod is driven into place quickly.
4. The shield-driven negative ring segment graded demolition construction method according to claim 3, wherein the driving depth of the anchor rods on 2-3 segments at the bottom of the positive ring segment is greater than that of the anchor rods of the rest segments of the positive ring segment.
5. The shield negative ring pipe piece graded demolition construction method according to claim 1, wherein the guide table is provided with a hanging ring, the negative ring pipe piece is provided with a connecting hole, and the rope body passes through and is connected with the hanging ring on the guide table.
6. The graded demolition construction method of a shield negative ring pipe piece according to claim 1, wherein the support steels include first support steels and second support steels, the first support steels are obliquely disposed at both sides of the bottom of the negative ring pipe piece and located outside the rope body, and the second support steels are located right below the bottom of the negative ring pipe piece and connected to the negative ring pipe piece.
7. The shield-driven negative-ring segment graded demolition construction method according to claim 1, wherein a through hole is formed in the segment of the negative-ring segment, a screw rod is arranged in the through hole in a penetrating manner, a shackle is arranged on the screw rod, a hoisting hole is formed in the shackle, nuts are connected to two ends of the screw rod, and the screw rod and the shackle are limited by the nuts.
8. The shield negative ring duct piece graded demolition construction method according to claim 1, wherein one end of the support rod is connected with the negative ring duct piece at the upper half of the negative 1 ring, the other end is connected with the reaction frame, and the support rods are arranged at intervals along the circumferential direction of the negative ring duct piece.
9. The shield-driven negative-ring segment graded demolition construction method according to claim 8, wherein the support rod is connected with the negative-ring segment through a support seat.
10. The shield-driven cathode-ray tube sheet graded demolition construction method according to claim 9, wherein the supporting base is provided with a bottom plate, the bottom plate is provided with two L-shaped angle plates, the two angle plates are symmetrically arranged, and the supporting rod is erected between the two angle plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010797270.5A CN111894627A (en) | 2020-08-10 | 2020-08-10 | Construction method for graded dismantling of shield negative ring pipe piece |
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| CN202010797270.5A CN111894627A (en) | 2020-08-10 | 2020-08-10 | Construction method for graded dismantling of shield negative ring pipe piece |
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2020
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| JP2003035087A (en) * | 2001-07-26 | 2003-02-07 | Geo-Research Institute | Starting method for shield machine |
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