CN111852514A - Supporting structure and construction method for shield machinable underground obstacle breaking treatment construction pilot tunnel - Google Patents
Supporting structure and construction method for shield machinable underground obstacle breaking treatment construction pilot tunnel Download PDFInfo
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- CN111852514A CN111852514A CN202010786318.2A CN202010786318A CN111852514A CN 111852514 A CN111852514 A CN 111852514A CN 202010786318 A CN202010786318 A CN 202010786318A CN 111852514 A CN111852514 A CN 111852514A
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 230000004888 barrier function Effects 0.000 claims abstract description 42
- 239000003365 glass fiber Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims description 24
- 230000005641 tunneling Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000011152 fibreglass Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 description 4
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The supporting structure comprises grid ribs, wherein the grid ribs are combined grids A; the combined grating A comprises bottom grating ribs and arch top grating ribs, the bottom grating ribs are of an integrated structure consisting of bottom grating ribs and vertical supporting ribs on two sides, the arch top grating ribs are of an integrated structure consisting of arched top ribs and vertical ribs on two sides, the bottom grating ribs and the arch top grating ribs are connected with the vertical ribs on two sides in a binding mode through the vertical supporting ribs on two sides to form the combined grating A, and the combined grating A corresponds to a treatment construction pilot tunnel in shape; the bottom grid rib of the combined grid A is a glass fiber rib grid rib, and the arch crown grid rib is a steel bar grid rib. The combined primary support structure with the glass fiber reinforced bars as the grid material provides support for the pilot tunnel, simultaneously prepares early for subsequent shield barrier removal, and has double effects of safe support and convenient removal.
Description
Technical Field
The invention relates to the technical field of tunnel engineering construction, in particular to a supporting structure and a construction method for a shield machinable underground barrier breaking treatment construction pilot tunnel. Relates to a supporting structure and a using method thereof in construction pilot tunnel breaking treatment.
Technical Field
At present, the shield method is a mechanized construction method widely applied to tunnel engineering because of the advantages of high safety, high tunneling speed, small environmental influence and the like. However, in the actual shield construction process, the shield is often subjected to obstacles which are difficult to cut, such as large boulders, abandoned underground structures and the like. Although the current shield can usually rely on a high-strength cutter head to remove obstacles in a hard grinding mode along with the continuous progress of shield manufacturing technology, the reliability is poor due to more uncontrollable factors. Once the shield cutter head is blocked and cannot rotate and other faults occur, the fault handling cost is high, and the shield is stopped, so that the tunnel face is decompressed, and collapse accidents are caused. Therefore, when the risk of failure of the shield to grind the obstacle is not acceptable, it is necessary to perform a breaking process on the underground obstacle in the shield tunneling path in advance.
The main breaking methods at present are: the method comprises the steps of vertically excavating to the position of an obstacle from the ground to the position above the obstacle, and then breaking the obstacle. For tunnel engineering in cities, the ground position corresponding to the barrier cannot be dismantled due to early facilities, buildings and the like, so that the tunnel engineering often does not have vertical excavation conditions and lacks practicability.
For the stratum supporting structure in the barrier treatment process, a shield machinable concrete structure is required because the stratum supporting structure is also positioned in the shield tunneling range. The application form of the prior support structure with the cuttable concrete structure is that glass fiber reinforcements are used for replacing reinforcing steel bars in the areas of the shield tunneling through the plane in the structural planes of guard piles, underground continuous walls, blocking end walls and the like, so that the shield is easy to cut. In view of the above problems, there is a need for a supporting structure and a construction method for a shield-cuttable underground obstacle breaking treatment construction pilot tunnel.
Disclosure of Invention
The invention discloses a supporting structure and a construction method for a shield machinable underground obstacle breaking treatment construction pilot tunnel, aiming at solving the problem that under the condition that construction conditions are not available right above an obstacle, underground excavation breaking treatment can be carried out, and by providing a pilot tunnel supporting structure formed by shield machinable materials, after the construction pilot tunnel is moved to the position of the underground obstacle and broken, the remaining pilot tunnel supporting structure can be cut by a shield machine without obstructing shield tunneling.
The invention is realized by the following technical scheme:
the support structure for the shield machinable underground obstacle breaking treatment construction pilot tunnel comprises grid ribs, wherein the grid ribs are combined grids A; the combined grating A comprises bottom grating ribs and arch-top grating ribs, the bottom grating ribs are of an integrated structure consisting of bottom grating ribs and vertical supporting ribs on two sides, the arch-top grating ribs are of an integrated structure consisting of arched top ribs and vertical ribs on two sides, the bottom grating ribs and the arch-top grating ribs are bound and connected with the vertical ribs on two sides through the vertical supporting ribs on two sides to form the qualified grating ribs A, and the combined grating A corresponds to the shape of the treatment construction pilot tunnel; the bottom grid rib of the combined grid A is a glass fiber rib grid rib, and the arch crown grid rib is a steel bar grid rib.
The glass fiber rib grid rib is formed by bending and shaping a glass fiber rib section, the glass fiber rib section is four prisms of a cubic frame structure formed by four glass fiber main ribs, and a plurality of Z-shaped glass fiber structure ribs and a plurality of U-shaped glass fiber structure ribs are bound between the prisms and are supported and connected into an integral structure.
The cross section of the glass fiber reinforced plastic section is rectangular, in the length direction of the glass fiber reinforced plastic section, a pair of opposite surfaces of the cubic frame structure is bound with a plurality of Z-shaped structural rib supports which are arranged in sequence, and the other pair of opposite surfaces is bound with a plurality of U-shaped structural rib supports which are arranged in sequence.
The Z-shaped structural ribs are connected end to form a trapezoid, and the openings of the U-shaped structural ribs face to the same side; the binding is performed by using steel wires; the construction ribs of the opposite faces of the cubic frame structure are symmetrically arranged.
The combined grating A is characterized in that a vertically arranged grating vertical supporting rib is added in the middle of the combined grating A to form a combined grating B, the grating vertical supporting rib is formed by U-shaped bolts for steel bar gratings or glass fiber reinforced plastic bars at the lower parts of steel wires in a binding mode, the top of the grating vertical supporting rib is connected with a top rib in a binding mode through the steel wires, and the bottom of the grating vertical supporting rib is connected with a bottom grating rib in a binding mode through the steel wires.
And the upper parts of the bottom grating ribs are bound and connected with the arch top grating ribs by U-shaped bolts or steel wires.
The construction method of the supporting structure for the construction pilot tunnel by the breaking treatment of the underground obstacles which can be cut by the shield comprises the following steps:
step 4, processing the barrier between the shield right line areas, synchronously performing step 2, opening the other half of a horsehead side pilot tunnel II (H2) to one side of the existing barrier in the pile cutting channel, densely arranging 4B-shaped combined grids in the side pilot tunnel II, chiseling the existing barrier fender post in the range of the combined grids, performing net spraying and blocking processing on the tunnel face of the barrier fender post,
and 5, after the treatment in the step 4, removing the barrier partition wall in the side pilot tunnel II by drilling, and backfilling the left side pilot tunnel with C15 plain concrete.
And 6, erecting a B-shaped combined grating on one side of the pile cutting channel, which is far away from the existing barrier, at two sides of the shield path range in the left and right line sections of the shield, chiseling the original primary support in the range of the B-shaped combined grating, spraying and sealing the tunnel face, and pumping C15 plain concrete in the pile cutting channel for backfilling.
The invention has the beneficial effects that:
the combined type primary support structure is constructed in a construction pilot tunnel, and the combined type primary support structure is constructed by taking the glass fiber reinforced bars as grid materials, so that support is provided for the pilot tunnel, meanwhile, early preparation is made for subsequent shield barrier removal, and the combined type primary support structure has double effects of safe support and convenient removal.
Drawings
FIGS. 1(1) to 1(6) are schematic plan views of the construction steps of the present invention;
fig. 2(1) is an elevation schematic view of the pile drilling of the present invention, which is a cross-sectional view taken along the centerline 5-5 of the pile cutting channel in fig. 1 (3); FIG. 2(2) is a 6-6 sectional view along the centerline of the shield tunnel of FIG. 1 (3);
3(1) is a schematic view of the structure of the combined grid A of the present invention, 3(2) is a schematic view of the mark of the structure of the combined grid A,
4(1) is a schematic view of the structure of the combined grid B of the present invention, 4(2) is a schematic view of the mark of the structure of the combined grid B,
FIG. 5(1) is a schematic view showing the expanded glass fiber grid of the present invention, FIG. 5(2) is a schematic view showing Z-shaped ribs, and FIG. 5(3) is a schematic view showing U-shaped ribs;
FIG. 6(1) is a schematic view of the portion G of FIG. 4(2), FIG. 6(2) is a sectional view taken along line 1-1 of FIG. 6(1), and FIG. 6(3) is a sectional view taken along line 2-2 of FIG. 6 (1);
FIG. 7(1) is a schematic view of the portion H of FIG. 4(2), and FIG. 7(2) is a sectional view taken along the line 3-3 of FIG. 7 (1);
FIG. 8(1) is a schematic view of the section K in FIG. 3(2), and FIG. 8(2) is a sectional view taken from the position 4-4 in FIG. 8 (1);
description of the figure numbering: the device comprises a bottom grid rib 1, a vault grid rib 2, a grid vertical support rib 3, a bottom grid rib 11, a vertical support rib 12, a vertical rib 21, a glass fiber rib grid rib 100, a steel bar grid rib 200, a steel bar grid main rib 201, a glass fiber main rib 101, a Z-shaped glass fiber structural rib 102, a U-shaped glass fiber structural rib 103, a steel wire 104, a U-shaped bolt 105, a combined grid A, a combined grid B, a pile cutting channel H, a ingate side pilot hole I H1, an ingate side pilot hole II H2, a shield tunnel section L and an obstacle Q;
Detailed Description
Referring to fig. 3(1) and (2), the supporting structure for the shield machinable underground obstacle breaking treatment construction pilot tunnel comprises grid bars, wherein the grid bars are combined grids A; the combined grating A comprises a bottom grating rib (1) and a vault grating rib (2), the bottom grating rib is an integrated structure consisting of a bottom grating rib (11) and vertical support ribs (12) on two sides, the vault grating rib is an integrated structure consisting of an arched top rib and vertical ribs (21) on two sides, the bottom grating rib (1) and the vault grating rib (2) are connected with the vertical ribs (21) on two sides in a binding mode through the vertical support ribs (12) on two sides to form the qualified grating rib A, and the combined grating A corresponds to the shape of the treatment construction pilot tunnel; the combined grating A is characterized in that the bottom grating rib (1) is a glass fiber rib grating rib (100), and the arch crown grating rib (2) is a steel bar grating rib (200).
Referring to fig. 5(1) - (3), the glass fiber rib grating rib (100) is formed by bending and shaping a glass fiber rib profile, the glass fiber rib profile is four prisms of a cubic frame structure formed by four glass fiber main ribs (101), and a plurality of Z-shaped glass fiber structural ribs (102) and a plurality of U-shaped glass fiber structural ribs (103) are bound between the prisms and supported and connected into an integral structure.
Referring to fig. 6(1) -fig. 8(2), the cross section of the fiberglass reinforced plastic bar is rectangular, and in the length direction of the fiberglass reinforced plastic bar, one pair of opposite faces of the cubic frame structure is bound with a plurality of Z-shaped structural ribs (102) which are arranged in sequence for supporting, and the other pair of opposite faces is bound with a plurality of U-shaped structural rib supports (103) which are arranged in sequence for supporting.
The Z-shaped structural ribs are connected end to form a trapezoid, and the openings of the U-shaped structural ribs face to the same side; the binding steel wire (104) is used for binding; the construction ribs of the opposite faces of the cubic frame structure are symmetrically arranged.
Referring to the figures 4, (1) and (2), the middle part of the combined grid A is additionally provided with a vertically arranged grid vertical support rib (3) to form a combined grid B, the grid vertical support rib (3) is formed by U-shaped bolts (105) for reinforcing steel bar grids or glass fiber reinforced plastic bars at the lower part of steel wire binding, the top of the grid vertical support (3) is connected with a top rib by the steel wire binding, and the bottom end of the grid vertical support (3) is connected with a bottom grid rib (11) by the steel wire binding.
Referring to fig. 6(1) -fig. 8(2), the upper part of the bottom grid rib (1) is connected with the arch grid rib (2) by U-shaped bolts (105) or steel wire binding.
In fig. 6(1), 7(1) and 8(1), the steel bar grid main bar 201 and the glass fiber main bar 101 are bound by the U-shaped bolt (105). In fig. 6(2), fig. 6(3), fig. 7(2), and fig. 8(2), U-shaped bolts (105) are used for binding between the steel bar grid main bar 201 and the glass fiber main bar 101 and between the glass fiber main bar 101 and the glass fiber main bar 101. In fig. 6(1), 7(1) and 8(1), the main glass fiber ribs 101 are connected with the bottom grid ribs (11) by steel wire binding for bending and shaping at the corners of the bottom grid ribs. Steel bar grating structures are known in the art.
By applying the method of example 1 to the present example,
in the shield tunneling path in fig. 1(1) - (6), a barrier Q which is difficult to cut appears in the shield region of the left line and the right line, and the barrier Q is an existing fender post of a part of building structure, and is not suitable for a method for breaking the barrier Q by vertical excavation from the ground. The method is used for underground excavation of a channel, the building structure at the bottom part including the fender post is broken, and a construction shield can cut a supporting structure for processing a construction pilot tunnel; the construction method is that the position with ground condition is excavated vertically to the depth of the obstacle, and then the construction pilot tunnel is excavated transversely to the obstacle.
The construction method of the supporting structure for the construction pilot tunnel by using the shield machinable underground obstacle breaking treatment comprises the following steps:
step 4, barrier treatment is carried out on the shield right line area, step 2 is synchronous, the other half of a horsehead door side pilot hole II H2 is opened to one side of the existing barrier in the pile cutting channel, 4 densely arranged and combined B-type grids are constructed in the side pilot hole II H2, the existing barrier fender post in the range of the combined grids is chiseled, and net spraying blocking treatment is carried out on the face of the barrier fender post, and the figure 1(4) is shown;
and 5, after the treatment in the step 4, removing the barrier partition wall in the side pilot tunnel II by drilling, and backfilling the left side pilot tunnel with C15 plain concrete. See fig. 1 (5);
and 6, erecting a B-shaped combined grating on one side of the pile cutting channel, which is far away from the existing barrier, and on two sides of the shield path range in the left and right line sections of the shield, chiseling an original combined grating A primary support in the range of the B-shaped combined grating, spraying, mixing and plugging the tunnel face, and pumping C15 plain concrete in the pile cutting channel for backfilling. See fig. 1 (6).
After the supporting construction method is completed, as shown in fig. 2(1) and 2(2), only the combined grating B is reserved in the shield interval tunnel L, the reinforcing steel bar grating ribs at the top of the combined grating B are higher than those in the shield area, and only the glass fiber reinforced grating ribs at the bottom are in the shield area, so that the double effects of supporting and cutting are realized.
Claims (7)
1. A supporting structure for a shield machinable underground barrier breaking treatment construction pilot tunnel comprises grid ribs, and is characterized in that the grid ribs are combined grids A; the combined grating A comprises a bottom grating rib (1) and a vault grating rib (2), the bottom grating rib is an integrated structure consisting of a bottom grating rib (11) and vertical support ribs (12) on two sides, the vault grating rib is an integrated structure consisting of an arched top rib and vertical ribs (21) on two sides, the bottom grating rib (1) and the vault grating rib (2) are connected with the vertical ribs (21) on two sides in a binding mode through the vertical support ribs (12) on two sides to form the qualified grating rib A, and the combined grating A corresponds to the shape of the treatment construction pilot tunnel; the combined grating A is characterized in that the bottom grating rib (1) is a glass fiber rib grating rib (100), and the arch crown grating rib (2) is a steel bar grating rib (200).
2. The supporting structure for the shield-machinable underground obstacle breaking treatment construction pilot tunnel according to claim 1, wherein the glass fiber reinforced grid rib (100) is formed by bending and shaping glass fiber reinforced section bars, the glass fiber reinforced section bars are four prisms of a cubic frame structure formed by four glass fiber main ribs (101), and a plurality of Z-shaped glass fiber structural ribs (102) and a plurality of U-shaped glass fiber structural ribs (103) are bound between the prisms and are supported and connected into an integral structure.
3. The supporting structure for shield-cuttable underground obstacle breaking and treating construction pilot tunnel according to claim 2, wherein said fiberglass reinforced section bar has a rectangular cross section, and in the length direction of said fiberglass reinforced section bar, one pair of opposite faces of said cubic frame structure is bound with a plurality of Z-shaped structural rib supports (102) arranged in sequence, and the other pair of opposite faces is bound with a plurality of U-shaped structural rib supports (103) arranged in sequence.
4. The support structure for shield-cuttable underground obstacle breaking treatment construction pilot tunnel according to claim 3, wherein said Z-shaped structural ribs are connected end to form a trapezoid, and said U-shaped structural ribs are opened toward the same side; the binding steel wire (104) is used for binding; the construction ribs of the opposite faces of the cubic frame structure are symmetrically arranged.
5. The supporting structure of shield machinable underground obstacle breaking treatment construction pilot tunnel according to claim 1, characterized in that the middle of the combined grid A is added with vertically arranged grid vertical supporting bars (3) to form a combined grid B, the grid vertical supporting bars (3) are formed by U-shaped bolts (105) for reinforcing steel bar grids or glass fiber reinforced plastic bars under steel wire binding, the top of the grid vertical supporting (3) is connected with top bars by steel wire binding, and the bottom is connected with bottom grid bars (11) by steel wire binding.
6. The supporting structure of shield-machinable underground obstacle breaking treatment construction pilot tunnel according to claim 1, wherein the upper portion of the bottom grid rib (1) is bound with the arch-top grid rib (2) by U-bolts (105) or steel wires.
7. The method of constructing a supporting structure for a shield-cuttable underground obstacle breaking treatment construction pilot tunnel according to claim 1, comprising the steps of:
step 1, if an obstacle (Q) which is difficult to cut appears on a shield tunneling path, in an area adjacent to the obstacle, a transversely excavated underground pile cutting channel (H) exceeds the width range of a shield interval by 3 grids, the tail end of the transversely excavated underground pile cutting channel is subjected to end sealing treatment, and a combined grid A is supported in the transversely excavated underground pile cutting channel (H) within the range of the shield tunneling path and on two sides of the shield tunneling path;
step 2, in the pile cutting channel (H) processed in the step 1, firstly processing the barrier between the left lines of the shield, opening a ingate side pilot hole I (H1) to one side of the existing barrier, densely arranging 4B-shaped combined gratings in the side pilot hole I, chiseling the existing barrier guard post (Q) in the range of the combined gratings, and carrying out net spraying blocking processing on the face of the barrier guard post,
step 3, after the treatment in the step 2, chiseling barrier walls in the side pilot tunnel I, backfilling the side pilot tunnel I with C15 plain concrete,
step 4, processing the barrier between the shield right line areas, synchronously performing step 2, opening the other half of a horsehead side pilot tunnel II (H2) to one side of the existing barrier in the pile cutting channel, densely arranging 4B-shaped combined grids in the side pilot tunnel II, chiseling the existing barrier fender post in the range of the combined grids, performing net spraying and blocking processing on the tunnel face of the barrier fender post,
and 5, after the treatment in the step 4, removing the barrier partition wall in the side pilot tunnel II by drilling, and backfilling the left side pilot tunnel with C15 plain concrete.
And 6, erecting a B-shaped combined grating on one side of the pile cutting channel, which is far away from the existing barrier, at two sides of the shield path range in the left and right line sections of the shield, chiseling the original primary support in the range of the B-shaped combined grating, spraying and sealing the tunnel face, and pumping C15 plain concrete in the pile cutting channel for backfilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010786318.2A CN111852514A (en) | 2020-08-07 | 2020-08-07 | Supporting structure and construction method for shield machinable underground obstacle breaking treatment construction pilot tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010786318.2A CN111852514A (en) | 2020-08-07 | 2020-08-07 | Supporting structure and construction method for shield machinable underground obstacle breaking treatment construction pilot tunnel |
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| Publication Number | Publication Date |
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| CN111852514A true CN111852514A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010786318.2A Pending CN111852514A (en) | 2020-08-07 | 2020-08-07 | Supporting structure and construction method for shield machinable underground obstacle breaking treatment construction pilot tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338997A (en) * | 2021-06-10 | 2021-09-03 | 北京市政建设集团有限责任公司 | Supporting structure for shield machinable barrier breaking and treatment construction pilot tunnel |
-
2020
- 2020-08-07 CN CN202010786318.2A patent/CN111852514A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113338997A (en) * | 2021-06-10 | 2021-09-03 | 北京市政建设集团有限责任公司 | Supporting structure for shield machinable barrier breaking and treatment construction pilot tunnel |
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