CN112065443A - Continuous beam second section construction method based on karst cave underground river environment tunnel construction - Google Patents
Continuous beam second section construction method based on karst cave underground river environment tunnel construction Download PDFInfo
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- CN112065443A CN112065443A CN202010838162.8A CN202010838162A CN112065443A CN 112065443 A CN112065443 A CN 112065443A CN 202010838162 A CN202010838162 A CN 202010838162A CN 112065443 A CN112065443 A CN 112065443A
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- 238000010276 construction Methods 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000035515 penetration Effects 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
Abstract
A second section construction method of a continuous beam based on karst cave underground river environment tunnel construction comprises the following steps of S1: excavating a tunnel section A to a penetration karst cave; s2: the underground river is redirected; s3: backfilling the karst cave to the foundation surface of the tunnel; s4: protecting the hole wall and applying a plurality of anchor cables; s5: filling the karst cave and connecting the anchor cable with the backfill body; s6: excavating the backfill body to form a tunnel section B; s7: constructing an abutment at the section A of the tunnel; s8: dividing a first section, a second section, a third section and a closure section; s9: constructing a supporting foundation of the tunnel section A; s10: and constructing continuous beams from the first section to the closure section according to the sequence of the sections. Has the advantages of stability, reliability, high safety and capability of preventing sedimentation.
Description
Technical Field
The invention mainly relates to a tunnel construction technology of a karst cave underground river environment, in particular to a second section construction method of a continuous beam based on tunnel construction of the karst cave underground river environment.
Background
The Yujing mountain tunnel is located in Wexin county of Yunnan province, has the total length of 6306m and is a double-line tunnel. In 2016, 7, 23 days, a cave is detected by drilling a hole in advance on the small-mileage end face of a cross-cave working area, and a huge cave hall and a river are discovered after the cave is revealed. The karst cave is about 230m in transverse length and about 93m in width and is approximately rectangular, the top of the karst cave is in a vault shape, the vertical heights of halls are different from 50 m to 130m, the right side of the karst cave in the line direction is high, and the left side of the karst cave is low; and a river develops at the slope toe at the left side of the karst cave, and the river surface is 5-15 m wide. The tunnel passes through the huge karst cave hall, the two sides of the huge karst cave hall are provided with a tunnel section A, and the tunnel passes through the karst cave hall and is provided with a tunnel section B.
Because the tunnel needs to pass through a huge karst cave hall and the bottom is provided with a river, high risks are brought to early construction and later operation, such as block falling at the top of the karst cave, sinking at the bottom due to the river and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a continuous beam second section construction method which is reliable in fixation, high in safety and capable of preventing settlement and is based on tunnel construction in a karst cave underground river environment.
In order to solve the technical problems, the invention adopts the following technical scheme:
a continuous beam second section construction method based on karst cave underground river environment tunnel construction is disclosed, wherein the environment comprises a karst cave and an underground river positioned at the bottom of the karst cave, the tunnel passes through the karst cave, the tunnels at two ends of the karst cave are tunnel A sections, and the tunnel passing through the karst cave is tunnel B section; the construction method comprises the following steps:
s1: excavating a tunnel section A to a penetration karst cave;
s2: the underground river is diverted so that the underground river does not flow through the karst cave;
s3: backfilling the karst cave until the karst cave is backfilled to the foundation surface of the tunnel;
s4: protecting the cave wall of the karst cave, and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: constructing abutment, main piers and temporary buttresses on the section A of the tunnel to form abutments arranged at intervals, and ensuring that all the abutments are positioned on the section A of the tunnel;
s8: dividing an area above a pier close to a section B of the tunnel into a first section, dividing two sides of the first section into second sections, dividing the side parts of the two second sections into third sections, dividing a joint section between the two middle third sections, and setting the total length of all the sections as the construction length of the continuous beam;
s9: constructing a supporting foundation of the tunnel section A;
s10: by first festival section to closure section, continuous roof beam of construction according to the section order, wherein the concrete order of construction of second festival section is: and (3) performing concrete frame beam, midspan full-hall support construction → top support, cross beam and distribution beam erection → bottom die laying → bottom die elevation adjustment → outer side die erection and reinforcement → bottom web steel bar binding → bottom web corrugated pipe installation → inner die erection reinforcement → inner die adjustment → end die erection reinforcement → top plate steel bar and corrugated pipe installation → preformed hole embedded part installation → bottom die sundries cleaning → concrete pouring → equal strength of maintenance → inner die loosening and outer die dismantling → tensioning → mud jacking at the bottom of the first segment on two sides.
As a further improvement of the above technical solution:
in step S1, the lining construction is performed while performing support while excavating.
In step S2, a drainage tunnel is formed in communication with the river upstream so that the river does not flow through the cavern.
And plugging and backfilling the underground river at the downstream of the junction of the drainage tunnel and the underground river.
In step S4, steel fibers are applied to the cave wall and concrete is sprayed.
In step S5, grouting is performed in the gap between the backfill body and the cavern wall to seal the gap.
In step S6, the lining construction is performed while performing support while excavating.
Compared with the prior art, the invention has the advantages that:
the second section construction method of the continuous beam based on the tunnel construction of the karst cave underground river environment comprises the following steps of changing the way of the underground river so that the underground river does not flow through the karst cave and the influence of a water area on the bottom of the karst cave is eliminated; the karst cave is backfilled until the karst cave is filled, which is equivalent to the reconstruction treatment of the karst cave, so that the top of the karst cave is prevented from dropping blocks, and the safety is improved; the backfill body is connected with the cave wall of the karst cave by using the anchor cable, and then the diversion of the underground river is matched, so that the backfill body can be prevented from settling, and the stability and the reliability of the section B of the tunnel are improved; the tunnel section B and the tunnel section A at two ends are connected in a bridge-spanning mode through continuous beams, segmental construction is implemented, convenience of subsequent segmental construction is guaranteed through setting of a second segmental template, tension testing and grouting operation, loads of the bridge are located on the tunnel section A at two ends, and the backfill body, stability and reliability of the tunnel section B are further improved.
Drawings
Fig. 1 is a plan view of the cave-underground river environment of the present invention.
Fig. 2 is a plan view of the cave river environment of the present invention (with a spillway tunnel).
Fig. 3 is a sectional view of a continuous beam according to the present invention.
The reference numerals in the figures denote:
1. karst cave; 2. a river under the river; 3. a first segment; 4. a second segment; 5. a third segment; 6. a closure section; 7. a water drainage hole.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1 to 3, in an embodiment of the continuous beam second segment construction method based on tunnel construction in a karst cave river environment of the present invention, an environment includes a karst cave 1 and a river 2 located at the bottom of the karst cave 1, the tunnel passes through the karst cave 1, the tunnels at both ends of the karst cave 1 are tunnel a segments, and the tunnel passing through the karst cave 1 is tunnel B segments; the construction method comprises the following steps:
s1: excavating a tunnel section A to penetrate through the karst cave 1;
s2: the underground river 2 is diverted, so that the underground river 2 does not flow through the karst cave 1;
s3: backfilling the karst cave 1 until the karst cave is backfilled to the foundation surface of the tunnel;
s4: protecting the cave wall of the karst cave 1, and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave 1, and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: constructing abutment, main piers and temporary buttresses on the section A of the tunnel to form abutments arranged at intervals, and ensuring that all the abutments are positioned on the section A of the tunnel;
s8: dividing an area above a pier close to a section B of the tunnel into a first section 3, dividing two sides of the first section 3 into second sections 4, dividing the side parts of the two second sections 4 into third sections 5, dividing a space between the two middle third sections 5 into closure sections 6, and setting the total length of all the sections as the construction length of the continuous beam;
s9: constructing a supporting foundation of the tunnel section A;
s10: the continuous beam is continuously constructed from a first section 3 to a closure section 6 according to the sequence of the sections, wherein the specific construction sequence of a second section 4 is as follows: performing concrete frame beam, midspan full-hall support construction → top support, cross beam and distribution beam erection → bottom die laying → bottom die elevation adjustment → outer side die erection and reinforcement → bottom web steel bar binding → bottom web corrugated pipe installation → inner die erection reinforcement → inner die adjustment → end die erection reinforcement → top plate steel bar and corrugated pipe installation → preformed hole embedded part installation → bottom die sundries cleaning → concrete pouring → equal strength of maintenance → inner die loosening and outer die dismantling → tensioning → mud jacking at the bottom of the first segment 3.
In the method, the underground river 2 is diverted so that the underground river 2 does not flow through the karst cave 1, and the influence of a water area on the bottom of the karst cave 1 is eliminated; the karst cave 1 is backfilled until the karst cave is filled, namely the karst cave 1 is subjected to reconstruction treatment, so that the top of the karst cave 1 is prevented from dropping blocks, and the safety is improved; the backfill body is connected with the cave wall of the karst cave 1 by using the anchor cable, and then the diversion of the underground river 2 is matched, so that the backfill body can be prevented from settling, and the stability and reliability of the section B of the tunnel are improved; the tunnel section B and the tunnel section A at two ends are connected in a bridge-spanning mode through continuous beams, segmental construction is implemented, convenience of subsequent segmental construction is guaranteed through setting of the template of the second segmental 4, tension testing and grouting operation, loads of the bridge are located on the tunnel section A at two ends, and the backfill body, stability and reliability of the tunnel section B are further improved.
In this embodiment, in step S1, lining construction is performed while performing support while excavating. By adopting the mode, the stability and the reliability of the excavated cavern can be ensured.
In this embodiment, in step S2, a drainage tunnel 7 communicating with the upstream of the underground river 2 is implemented so that the underground river 2 does not flow through the cavern 1. The water at the upstream of the underground river 2 is diverted by the drainage tunnel 7 and flows out from the area outside the karst cave 1, so that the subsequent backfill body can be prevented from generating settlement.
In this embodiment, the underground river 2 downstream of the junction of the drainage tunnel 7 and the underground river 2 is plugged and backfilled. Therefore, the phenomenon of water immersion can be prevented, and the subsequent backfilling construction is facilitated.
In this embodiment, in step S4, steel fibers are applied to the cavity wall of the cavern 1, and concrete is sprayed. The arrangement is convenient for the implementation of the anchor cable, and simultaneously, the block falling at the top of the karst cave 1 can be prevented.
In this embodiment, in step S5, grouting is performed in the gap between the backfill body and the cave wall of the cavern 1 to seal the gap. The stability and the reliability of the backfill body are further improved.
In this embodiment, in step S6, lining construction is performed while performing support while excavating. By adopting the mode, the stability and the reliability of the excavated cavern can be ensured.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. A continuous beam second section construction method based on karst cave underground river environment tunnel construction is characterized in that the environment comprises a karst cave (1) and an underground river (2) located at the bottom of the karst cave (1), the tunnel penetrates through the karst cave (1), tunnels at two ends of the karst cave (1) are a tunnel section A, and a tunnel penetrating through the karst cave (1) is a tunnel section B; the construction method comprises the following steps:
s1: excavating a tunnel section A to a through karst cave (1);
s2: the underground river (2) is diverted, so that the underground river (2) does not flow through the karst cave (1);
s3: backfilling the karst cave (1) until the karst cave is backfilled to the tunnel foundation surface;
s4: protecting the cave wall of the karst cave (1), and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave (1) and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: constructing abutment, main piers and temporary buttresses on the section A of the tunnel to form abutments arranged at intervals, and ensuring that all the abutments are positioned on the section A of the tunnel;
s8: dividing an area above a pier close to a section B of the tunnel into a first section (3), dividing two sides of the first section (3) into second sections (4), dividing the side parts of the two second sections (4) into third sections (5), dividing a space between the two middle third sections (5) into closure sections (6), wherein the total length of all the sections is the construction length of the continuous beam;
s9: constructing a supporting foundation of the tunnel section A;
s10: the continuous beam is continuously constructed from the first section (3) to the closure section (6) according to the sequence of the sections, wherein the specific construction sequence of the second section (4) is as follows: and (2) performing concrete frame beam, midspan full-hall support construction → top support, cross beam and distribution beam erection → bottom die laying → bottom die elevation adjustment → outer side die erection and reinforcement → bottom web steel bar binding → bottom web corrugated pipe installation → inner die erection reinforcement → inner die adjustment → end die erection reinforcement → top plate steel bar and corrugated pipe installation → preformed hole embedded part installation → bottom die sundries cleaning → concrete pouring → equal strength maintenance → inner die loosening → outer die tensioning → mud pressure grouting on the bottoms of the two sides of the first segment (3).
2. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction according to claim 1, characterized in that: in step S1, the lining construction is performed while performing support while excavating.
3. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction according to claim 2, characterized in that: in step S2, a drainage tunnel (7) communicating with the upstream of the underground river (2) is constructed so that the underground river (2) does not flow through the cavern (1).
4. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction according to claim 3, characterized in that: and plugging and backfilling the underground river (2) at the downstream of the junction of the drainage tunnel (7) and the underground river (2).
5. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction is characterized in that: in step S4, steel fibers are applied to the cavity wall of the cave (1), and concrete is sprayed.
6. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction according to claim 5, characterized in that: in step S5, grouting is performed in the gap between the backfill body and the cavity wall of the cavern (1) to seal the gap.
7. The construction method of the second section of the continuous beam based on the karst cave underground river environment tunnel construction according to claim 6, characterized in that: in step S6, the lining construction is performed while performing support while excavating.
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| CN202010838162.8A CN112065443A (en) | 2020-08-19 | 2020-08-19 | Continuous beam second section construction method based on karst cave underground river environment tunnel construction |
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| CN202010838162.8A CN112065443A (en) | 2020-08-19 | 2020-08-19 | Continuous beam second section construction method based on karst cave underground river environment tunnel construction |
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| CN111485901A (en) * | 2020-04-15 | 2020-08-04 | 中国电建集团成都勘测设计研究院有限公司 | Method for building side-span non-filling type long and narrow shallow bottom karst cave section tunnel |
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- 2020-08-19 CN CN202010838162.8A patent/CN112065443A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201771516U (en) * | 2010-08-30 | 2011-03-23 | 中铁第四勘察设计院集团有限公司 | Supporting structure of district passing through cavern and underground river for tunnel |
| WO2016095630A1 (en) * | 2014-12-15 | 2016-06-23 | 中铁第四勘察设计院集团有限公司 | Method for constructing extra-large variable cross section tunnel |
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| CN111485901A (en) * | 2020-04-15 | 2020-08-04 | 中国电建集团成都勘测设计研究院有限公司 | Method for building side-span non-filling type long and narrow shallow bottom karst cave section tunnel |
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| 吴君;孙永亮;: "京沪高铁天津特大桥连续梁施工技术研究", 交通世界(建养.机械), no. 04, pages 1 * |
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