CN109653763B - Prefabricated prestressed tunnel reserved hole door device and construction method - Google Patents
Prefabricated prestressed tunnel reserved hole door device and construction method Download PDFInfo
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- CN109653763B CN109653763B CN201811516210.0A CN201811516210A CN109653763B CN 109653763 B CN109653763 B CN 109653763B CN 201811516210 A CN201811516210 A CN 201811516210A CN 109653763 B CN109653763 B CN 109653763B
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- 238000010276 construction Methods 0.000 title abstract description 22
- 239000011435 rock Substances 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims description 21
- 238000009412 basement excavation Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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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
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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)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a door device for a reserved hole of an assembled prestressed tunnel and a construction method, wherein the device comprises a vertical support frame (5) and a plurality of layers of prestressed components connected to different height positions of the vertical support frame (5), wherein a vertical support penetrates into an inverted arch bedrock of the tunnel and is kept fixed in the vertical direction; each layer of pre-stressed assembly comprises: the device comprises a horizontal support beam anchor rod (51), a horizontal support beam (52), a horizontal support beam inclined strut (53) and a prestressed steel strand (54); at least 3 horizontal support beam anchor rods on each layer are arranged and inserted into reserved rocks (2) of the opening in parallel, and the horizontal support beams are placed on the horizontal support beam anchor rods and fixed; one end of the horizontal support beam inclined strut is connected with the horizontal support beam, and the other end of the horizontal support beam inclined strut is connected with the vertical support frame; and the prestressed steel strands are fixed at two ends of the horizontal support beam after being tensioned by the horizontal support beam diagonal braces. During construction, the invention has less disturbance reserved rocks and high safety; the device is of an assembled structure, so that the construction is simple and the disassembly is convenient; can be repeatedly used and has good economical efficiency.
Description
Technical Field
The invention belongs to the field of underground protection engineering, and relates to a tunnel reserved hole door device and a construction method.
Background
In the construction of an underground traffic junction, the situation that a newly repaired road is communicated with an old tunnel in a crossed manner often occurs, and because the traffic flow of the old tunnel is very large, the construction of a closed tunnel can cause great influence on traffic; if the tunnel is not closed, the old tunnel space is occupied for construction, and the space in the tunnel is narrow, so that traffic accidents are easily caused. If the communication section between the new tunnel and the old tunnel is planned in advance in the construction process of the old tunnel, the construction difficulty, the construction period and the construction cost of the communication between the new tunnel and the old tunnel are greatly reduced. In order to avoid vehicle mistake entering, artificial destruction tunnel UNICOM section, also in order to reduce the maintenance cost, tunnel UNICOM section can be left a segment and not excavated, treats that the road of newly repairing is built to the entrance to a cave, excavates again and link up.
However, the construction risk of the reserved hole door is very high, firstly, the hole door is constructed in the slope toe of the rock slope, the slope has a certain downward sliding tendency, the slope toe plays a role in preventing the slope from sliding, the hole door is constructed at the slope toe, a stress concentration area is formed, and the effect of preventing the slope from sliding is reduced; secondly, normally excavating the portal from outside to inside generally pre-reinforces the portal rock mass, disturbance to the rock mass caused by excavation is concentrated near the portal, and the stability of rocks at other parts is not affected, while excavating the portal from inside to outside, the rock mass at the portal part is already disturbed by stress at other parts of the excavation engineering, the stability is greatly reduced, and the portal rock mass cannot be pre-reinforced for concealment, so that the risk of instability is very high; thirdly, the thinner the reserved rock body of the tunnel portal, the faster the speed of opening the tunnel portal, but the poorer the stability of the rock body, and during the period that the tunnel portal is not opened, the difference between the temperature inside and outside the tunnel is extremely large, the internal and external deformation of the rock body is inconsistent, the cracking is caused by expansion with heat and contraction with cold, and the worse the stability of the rock body is caused by the influence of weathering; fourthly, when the tunnel door is opened, the speed is crucial, and when blasting excavation is adopted, splashed broken stones can splash into the tunnel, so that the safety of personnel and vehicles is endangered; if other methods are adopted for excavation, the speed is slower.
Therefore, at present, a tunnel reserved hole door device and a construction method which are thin in reserved rock mass, high in stability, low in technical difficulty, simple and safe in construction, high in opening speed and safe in dismantling are needed to be sought.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an assembly type pre-stressed tunnel reserved hole door device and a construction method. The purpose of the invention can be realized by the following technical scheme:
an assembled pre-stressed tunnel reserved hole door device comprises a vertical support frame and a plurality of layers of pre-stressed assemblies connected to different height positions of the vertical support frame, wherein the vertical support frame penetrates into inverted arch bedrock of a tunnel and is kept fixed in the vertical direction; each layer of pre-stressed assembly comprises: the horizontal support beam anchor rod, the horizontal support beam diagonal brace and the prestressed steel strand; at least 3 horizontal support beam anchor rods are arranged on each layer and are inserted into reserved rocks of the hole in parallel, and the horizontal support beams are placed on the horizontal support beam anchor rods and are fixed; one end of the horizontal support beam inclined strut is connected with the horizontal support beam, and the other end of the horizontal support beam inclined strut is connected with the vertical support frame; and the prestressed steel strands are fixed at two ends of the horizontal support beam after being tensioned by the horizontal support beam diagonal braces.
Furthermore, the vertical support frame is divided into a plurality of sections, each section corresponds to one layer of prestress assembly, and the sections are connected through bolts or welding.
Furthermore, the horizontal support beam inclined strut corresponding to each horizontal support beam anchor rod is supported on the left side and the right side of the horizontal support beam anchor rod.
Furthermore, the vertical support frame is connected with the horizontal support beam diagonal brace through welding or bolts; the horizontal support beam inclined strut is connected with the horizontal support beam through welding or bolts.
Further, the horizontal support beam is fixed to the horizontal support beam anchor rod by welding or bolts.
Further, the vertical support frames are at least two.
The construction method of the door device of the prefabricated prestressed tunnel reserved hole comprises the following steps:
1) when the tunnel is excavated from the inside to the outside to a position close to a tunnel portal, the tunnel is excavated by a step method, firstly, ear holes at the left part and the right part of an upper step of the tunnel are excavated, after the excavation is finished, holes are drilled in a bed rock below the ear holes, a plurality of sections of vertical support frames are inserted into the holes, and the sections are connected by bolts or welding;
2) after excavating the middle part of the upper step, drilling a hole on the reserved rock at the opening of the hole to fix a horizontal support beam anchor rod;
3) welding or fixing the horizontal support beam on the horizontal support beam anchor rod by using a bolt; after the horizontal support beam is erected, a horizontal support beam diagonal brace is arranged, the horizontal support beam diagonal brace is connected with the horizontal support beam and the vertical support frame through welding or bolts, the prestressed steel strand is tensioned to a designed value along the arrangement direction of the horizontal support beam diagonal brace, and the prestressed steel strand is fixed at two ends of the horizontal support beam;
4) and (5) sequentially downwards excavating a second step, and repeating the steps 2) to 3).
Compared with the prior art, the invention has the following characteristics:
1. during construction, the number of disturbed reserved rocks is small, and the safety is high;
2. the device is of an assembled structure, so that the construction is simple and the disassembly is convenient;
3. can be repeatedly used and has good economical efficiency.
Drawings
FIG. 1 is an overall sectional view of a door device for a pre-reserved hole of an assembled pre-stressed tunnel (FIG. 3, 7, B-B sectional view);
fig. 2 is an overall sectional view of the door device for the reserved hole of the fabricated prestressed tunnel (fig. 3, (7) a-a sectional view);
fig. 3 is a schematic horizontal projection diagram of the construction sequence of the whole side section of the door device of the prefabricated prestressed tunnel reserved hole (divided into steps (1) - (7)).
The notation in the figure is:
the method comprises the following steps of 1-tunnel portal mountain body, 2-portal reserved rock, 3-excavation section, 4-non-excavation section, 5-vertical support frame, 51-horizontal support beam anchor rod, 52-horizontal support beam, 53-horizontal support beam inclined strut and 54-prestress steel strand. a 1-ear hole; a. b and c respectively represent a first step, a second step and a third step.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
As shown in fig. 1 and 2, the door device for the reserved hole of the fabricated prestressed tunnel comprises a vertical support frame 5 and a plurality of layers of prestressed components connected to different height positions of the vertical support frame 5, wherein the vertical support frame 5 penetrates into an inverted arch bedrock of the tunnel and is kept fixed in the vertical direction for supporting the whole device; each layer of pre-stressed assembly comprises: a horizontal support beam anchor rod 51, a horizontal support beam 52, a horizontal support beam diagonal brace 53 and a prestressed steel strand 54; at least 3 horizontal support beam anchor rods 51 on each layer are arranged and inserted into the reserved rock 2 of the opening in parallel, and the horizontal support beams 52 are placed on the horizontal support beam anchor rods 51 and fixed; one end of the horizontal support beam inclined strut 53 is connected with the horizontal support beam 52, and the other end is connected with the vertical support frame 5; the prestressed steel strands 54 are fixed to both ends of the horizontal support beam 52 after being tensioned by the horizontal support beam diagonal braces 53. The tension of the prestressed steel strand acts on the horizontal supporting beam through the inclined strut of the horizontal supporting beam, and finally acts on reserved rocks at the opening through the horizontal supporting beam, so that the stability of the reserved rocks is guaranteed.
The vertical support frame 5 is divided into a plurality of sections, each section corresponds to one layer of prestress assembly, and the sections are connected through bolts or welding. Each horizontal support beam anchor rod 51 is correspondingly provided with a horizontal support beam inclined strut 53 supported at two sides thereof. The vertical support frame 5 is connected with the horizontal support beam inclined strut 53 through welding or bolts; the horizontal support beam diagonal brace 53 and the horizontal support beam 52 are connected by welding or bolts. The horizontal support beam 52 is fixed to the horizontal support beam anchor 51 by welding or bolts. The vertical support frames 5 are at least two.
Example 2
The construction method of the prefabricated prestressed tunnel reserved hole door device according to embodiment 1 includes the following steps, as shown in fig. 3:
1) when the tunnel is excavated from the inside to the outside to a position close to a tunnel portal, the tunnel is excavated by a step method, firstly, ear holes at the left part and the right part of an upper step of the tunnel are excavated, after the excavation is finished, holes are drilled in a bedrock below the ear holes, the vertical support frames 5 divided into a plurality of sections are inserted into the holes, and the sections are connected by bolts or welding;
2) after excavating the middle part of the upper step, drilling a hole on the reserved rock 2 of the opening to fix a horizontal support beam anchor rod 51;
3) welding or bolting the horizontal support beam 52 to the horizontal support beam anchor 51; after the horizontal support beams 52 are erected, horizontal support beam inclined struts 53 are arranged, the horizontal support beam inclined struts 53 are connected with the horizontal support beams 52 and the vertical support frames 5 through welding or bolts, prestressed steel strands 54 are tensioned to a designed value along the arrangement direction of the horizontal support beam inclined struts 53 and are fixed at the two ends of the horizontal support beams 52;
4) sequentially downwards excavating a second step, and repeating the steps 2) to 3); and (3) downwards excavating a second step, a third step and the like in sequence, protecting the pre-embedded vertical supporting frame in the excavating process, and sequentially installing a horizontal supporting beam anchor rod, a horizontal supporting beam, tensioning and fixing a prestressed steel strand according to the upper section step after the excavating is finished.
When the tunnel door needs to be opened emergently, prestress is removed, the bolt is loosened to dismantle the device, reserved rocks are crushed by directly using a rock drill provided with a crushing head, or the rocks are exploded by using explosive, and after crushed rocks are removed, personnel and equipment can quickly exit the tunnel.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. The utility model provides an assembled prestressing force tunnel reserves hole door gear which characterized in that: the device comprises a vertical support frame (5) and a plurality of layers of prestress assemblies connected to different height positions of the vertical support frame (5), wherein the vertical support frame (5) penetrates into tunnel inverted arch bedrock and is kept fixed in the vertical direction; each layer of pre-stressed assembly comprises: the device comprises a horizontal support beam anchor rod (51), a horizontal support beam (52), a horizontal support beam inclined strut (53) and a prestressed steel strand (54); at least 3 horizontal support beam anchor rods (51) on each layer are arranged and inserted into reserved rock (2) of the opening in parallel, and the horizontal support beams (52) are placed on the horizontal support beam anchor rods (51) and fixed; one end of the horizontal supporting beam inclined strut (53) is connected with the horizontal supporting beam (52), and the other end of the horizontal supporting beam inclined strut is connected with the vertical supporting frame (5); the prestressed steel strands (54) are fixed at two ends of the horizontal support beam (52) after being tensioned through the horizontal support beam inclined strut (53).
2. The fabricated prestressed tunnel reserved hole door apparatus of claim 1, wherein: the vertical support frame (5) is divided into a plurality of sections, each section corresponds to one layer of prestress assembly, and the sections are connected through bolts or welding.
3. The fabricated prestressed tunnel reserved hole door apparatus of claim 1, wherein: the horizontal support beam diagonal brace (53) corresponding to each horizontal support beam anchor rod (51) is supported on the left and right sides thereof.
4. The fabricated prestressed tunnel reserved hole door apparatus of claim 1, wherein: the vertical support frame (5) is connected with the horizontal support beam inclined strut (53) through welding or bolts; the horizontal supporting beam inclined strut (53) is connected with the horizontal supporting beam (52) through welding or bolts.
5. The fabricated prestressed tunnel reserved hole door apparatus of claim 1, wherein: the horizontal support beam (52) is fixed to the horizontal support beam anchor (51) by welding or bolts.
6. The fabricated prestressed tunnel reserved hole door apparatus of claim 1, wherein: the number of the vertical supporting frames (5) is at least two.
7. The method for constructing a door device of a reserved hole of an assembled prestressed tunnel according to claim 1, wherein: the method comprises the following steps:
1) when the tunnel is excavated from the inside to the outside to a position close to a tunnel portal, the tunnel is excavated by a step method, firstly, ear holes at the left part and the right part of an upper step of the tunnel are excavated, after the excavation is finished, holes are drilled in a bedrock below the ear holes, vertical support frames (5) divided into a plurality of sections are inserted into the holes, and the sections are connected by bolts or welding;
2) after excavating the middle part of the upper step, drilling a hole on the reserved rock (2) of the opening to fix a horizontal support beam anchor rod (51);
3) welding or bolting the horizontal support beam (52) to the horizontal support beam anchor rod (51); after the horizontal support beam (52) is erected, a horizontal support beam inclined strut (53) is arranged, the horizontal support beam inclined strut (53), the horizontal support beam (52) and the vertical support frame (5) are connected through welding or bolts, a prestressed steel strand (54) is tensioned to a design value along the arrangement direction of the horizontal support beam inclined strut (53), and the prestressed steel strand is fixed at two ends of the horizontal support beam (52);
4) and (5) sequentially downwards excavating a second step, and repeating the steps 2) to 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516210.0A CN109653763B (en) | 2018-12-12 | 2018-12-12 | Prefabricated prestressed tunnel reserved hole door device and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516210.0A CN109653763B (en) | 2018-12-12 | 2018-12-12 | Prefabricated prestressed tunnel reserved hole door device and construction method |
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| Publication Number | Publication Date |
|---|---|
| CN109653763A CN109653763A (en) | 2019-04-19 |
| CN109653763B true CN109653763B (en) | 2020-05-08 |
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| CN201811516210.0A Expired - Fee Related CN109653763B (en) | 2018-12-12 | 2018-12-12 | Prefabricated prestressed tunnel reserved hole door device and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11280387A (en) * | 1998-03-30 | 1999-10-12 | Shin Kasado Dock:Kk | Device for preventing hanging of vine |
| CN103195432A (en) * | 2013-03-08 | 2013-07-10 | 中铁二十二局集团第一工程有限公司 | Weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method |
| CN106567723B (en) * | 2015-10-13 | 2018-08-28 | 叶大伟 | A kind of gliding mass section tunnel reinforcement system and its reinforcement means |
| CN107514266A (en) * | 2017-09-06 | 2017-12-26 | 海南大学 | Shield export ＆ import bolt anchorage soil body construction method |
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Granted publication date: 20200508 |