CN110792455A - Tunnel waterproof board outer side cavity processing method and tunnel cavity grouting structure - Google Patents
Tunnel waterproof board outer side cavity processing method and tunnel cavity grouting structure Download PDFInfo
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- CN110792455A CN110792455A CN201911364869.3A CN201911364869A CN110792455A CN 110792455 A CN110792455 A CN 110792455A CN 201911364869 A CN201911364869 A CN 201911364869A CN 110792455 A CN110792455 A CN 110792455A
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- grouting
- tunnel
- pipe
- plugging
- grouting pipe
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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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
Abstract
The invention relates to a tunnel waterproof board outer side cavity treatment method and a tunnel cavity grouting structure, which comprise a tunnel hole extending along the front-back direction, wherein a tunnel primary support is sprayed on the inner wall of the tunnel hole, a waterproof board is arranged along the inner side of the tunnel primary support, two lining concretes are arranged on the inner side of the waterproof board, a grouting space is formed between the waterproof board and the tunnel primary support, front plugging grouting pipes and rear plugging grouting pipes which are arranged at intervals are arranged in the grouting space, the front plugging grouting pipes and the rear plugging grouting pipes are arranged along the circumferential direction of the top of the tunnel, filling grouting pipes which extend along the front-back direction and/or are arranged annularly along the circumferential direction of the tunnel are also arranged in the grouting space, grouting holes which are arranged at intervals along the axial direction of the corresponding grouting pipes are arranged on the side wall of each grouting pipe, and main grouting pipes led out from the plugging grouting pipes at the corresponding side are connected to the filling grouting pipes. The invention solves the technical problem that the secondary lining concrete cracks due to negative bending moment caused by the cavity between the waterproof board and the primary support of the tunnel.
Description
Technical Field
The invention relates to a tunnel waterproof board outer side cavity processing method and a tunnel cavity grouting structure in the field of tunnel support.
Background
The existing tunnel structure is shown in fig. 1, and the basic construction sequence is that a tunnel is excavated, then the inner wall of the tunnel is sprayed with slurry to form a primary tunnel support 1, then geotextile 2 and a waterproof board 3 are fixed on the primary tunnel support, and the inner side of the waterproof board 3 is provided with a secondary lining concrete 4. In use, the problem of cracking of the two-lining concrete often occurs, and the skilled person can not find the reason for the cracking of the two-lining concrete all the time.
The applicant finds that the inner wall of the tunnel is not flat, the primary tunnel support after guniting is not flat, the flatness of the primary tunnel support is poor, and the waterproof board is difficult to be tightly attached to the primary tunnel support, so that a cavity is formed between the primary tunnel support and the waterproof board, and in addition, the cavity 5 is easily formed by falling and folding of the waterproof board due to insufficient looseness and local tightness of the waterproof board during laying or excessive looseness and insufficient fixing number of the waterproof handle during pouring of the secondary lining concrete under the impact of the secondary lining concrete.
The existence of the cavity between the waterproof board and the primary support of the tunnel causes uneven stress of the concrete of the secondary lining, thereby generating negative bending moment to cause the cracking of the concrete of the secondary lining and influencing the use safety of the tunnel.
Disclosure of Invention
The invention aims to provide a method for processing holes at the outer side of a tunnel waterproof board, which can fill the holes between the waterproof board and a primary tunnel support, and aims to solve the technical problem that secondary lining concrete cracks due to negative bending moment caused by the holes between the waterproof board and the primary tunnel support; the invention also aims to provide a tunnel cavity grouting structure used on the outer side of the tunnel waterproof board.
In order to solve the technical problems, the technical scheme of the tunnel cavity grouting structure is as follows:
the utility model provides a tunnel hole slip casting structure, include the tunnel hole that extends along the fore-and-aft direction, the spraying has the tunnel to prop first on the inner wall in tunnel hole, the inboard of propping first along saying is equipped with the waterproof board, the inboard of waterproof board is equipped with two lining concrete, form the slip casting space between waterproof board and the tunnel, arrange preceding shutoff slip casting pipe and the back shutoff slip casting pipe of interval arrangement around arranging in the slip casting space, preceding shutoff slip casting pipe, back shutoff slip casting pipe extends along tunnel top circumference and arranges, still arrange in the slip casting space along the fore-and-aft direction extend and/or encircle along tunnel circumference establish the packing slip casting pipe of arranging, offer the slip casting hole along corresponding slip casting pipe axial interval arrangement on the lateral wall of each slip casting pipe, be connected with the main slip casting pipe of drawing forth by corresponding side shutoff slip casting pipe department on the packing slip casting pipe.
And a plurality of filling grouting pipes extending in the front-back direction are further arranged in the grouting space, and the filling grouting pipes are circumferentially arranged at intervals along the tunnel hole.
And a plurality of filling grouting pipes which are arranged along the circumferential direction of the tunnel in an annular mode are further arranged in the grouting space, and the filling grouting pipes are arranged at intervals along the front-back direction.
The tunnel cavity grouting structure further comprises a leading-out exhaust pipe, one end of the leading-out exhaust pipe is led out from the corresponding plugging grouting pipe, the other end of the leading-out exhaust pipe is communicated with the filling grouting pipe, or the other end of the exhaust pipe is connected with an inner side exhaust pipe located in the grouting space.
The grouting holes in the grouting pipes are arranged in the axial direction corresponding to the grouting pipes to form a plurality of grouting hole groups, each grouting hole group comprises two grouting holes which are circumferentially arranged at intervals along the grouting pipes, the two grouting holes in the same grouting hole group are coaxially arranged, and the axes of the grouting holes in the two adjacent grouting hole groups are vertically arranged.
The technical scheme of the method for treating the outer cavity of the tunnel waterproof plate comprises the following steps:
a method for processing holes on the outer side of a tunnel waterproof plate comprises the following steps of; after spraying the tunnel primary support on the inner wall of the tunnel, fixing a front plugging grouting pipe, a rear plugging grouting pipe, a filling grouting pipe, a main grouting pipe and a leading-out exhaust pipe on the tunnel primary support, wherein the front plugging grouting pipe and the rear plugging grouting pipe are arranged along the circumferential direction of the top of the tunnel in an extending way, the filling grouting pipe is arranged along the front-back direction and/or in a circumferential ring arrangement way along the tunnel, grouting holes are formed in the side wall of each grouting pipe and are axially arranged at intervals along the corresponding grouting pipe, the filling grouting pipe is positioned between the front plugging grouting pipe and the rear plugging grouting pipe, one end of the main grouting pipe is connected with the filling grouting pipe, the other end is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, one end of the leading-out exhaust pipe is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, the other end of the leading-out exhaust pipe is communicated with the filling grouting pipe, or the other end of the leading-out exhaust pipe is connected with an inner side exhaust pipe positioned in the grouting space; fixing geotextile and a waterproof board on the primary tunnel support, pouring second lining concrete on the inner side of the waterproof board, and forming a grouting space between the waterproof board and the primary tunnel support; and thirdly, firstly, grouting between the waterproof plate and the primary support of the tunnel by the front plugging grouting pipe and the rear plugging grouting pipe to form a closed structure at the front end and the rear end of the grouting space, then discharging air in the grouting space through the leading-out exhaust pipe, and grouting the grouting space through the main grouting pipe and each filling grouting pipe.
The invention has the beneficial effects that: according to the invention, firstly, the front plugging grouting pipe and the rear plugging grouting pipe are used for grouting between the waterproof board and the primary support of the tunnel to form a closed structure at the front end and the rear end of the grouting space, then, air in the grouting space is exhausted through the exhaust pipe, grouting is carried out on the grouting space through the main grouting pipe and the filling grouting pipes, and the grouting material can effectively fill a cavity between the waterproof board and the primary support under the action of certain pressure, so that the cavity between the waterproof board and the primary support is prevented from being generated, and the cracking problem caused by uneven stress of secondary concrete is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a prior art tunnel structure of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 1 of the tunnel void grouting structure according to the present invention;
FIG. 3 is a schematic layout view of the grouting pipes and the exhaust pipes in FIG. 2 in a top view;
FIG. 4 is a schematic view of the construction of the grout pipe of FIG. 2;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is a sectional view taken along line B-B of FIG. 4;
FIG. 7 is a schematic layout view of each grouting pipe and exhaust pipe in a plan view direction in example 2 of a tunnel cavity grouting structure according to the present invention;
fig. 8 is a schematic structural view of a grouting pipe in example 3 of the tunnel cavity grouting structure of the present invention.
Detailed Description
An embodiment 1 of a tunnel void grouting structure is shown in fig. 2 to 6: the tunnel comprises a tunnel hole which is formed in a base body 6 and extends in the front-back direction, a tunnel primary support 1 is sprayed on the inner wall of the tunnel hole, geotextile 2 and a waterproof plate 3 are arranged on the inner side of the tunnel primary support 1, and two linings of concrete 4 are arranged on the inner side of the waterproof plate 3. A grouting space 5 is formed between the waterproof plate and the primary support of the tunnel, a front plugging grouting pipe 8 and a rear plugging grouting pipe 10 which are arranged at a front interval and a rear interval are arranged in the grouting space, and the front plugging grouting pipe 8 and the rear plugging grouting pipe 10 are arranged in a circumferential extending mode along the top of the tunnel. And filling grouting pipes 7 extending in the front-rear direction are further arranged in the grouting space, the filling grouting pipes 7 are multiple, and the filling grouting pipes are circumferentially arranged at intervals. The filling grouting pipe 7 is connected with a main grouting pipe 12 led out from the front side of the front plugging grouting pipe 8.
The tunnel cavity grouting structure further comprises a leading-out exhaust pipe 9, the front end of the leading-out exhaust pipe is led out from the front side of the front plugging grouting pipe, the other end of the exhaust pipe is connected with an inner exhaust pipe 11 located in the grouting space, the inner exhaust pipe 11 extends along the circumferential direction of the top of the tunnel, and an exhaust port 20 is formed in the side wall of the inner exhaust pipe 11. In this embodiment, since the tunnel top is not a complete ring, the front plugging grouting pipe 8, the rear plugging grouting pipe 10, and the inner exhaust pipe 11 are not a complete ring as a whole.
The side wall of each grouting pipe is provided with grouting holes 17 which are arranged at intervals along the axial direction of the corresponding grouting pipe, the grouting holes on each grouting pipe are arranged into a plurality of grouting hole groups along the axial direction of the corresponding grouting pipe, each grouting hole group comprises two grouting holes which are uniformly arranged at intervals along the circumferential direction of the grouting pipe, two grouting holes in the same grouting hole group are arranged coaxially, and the axes of the grouting holes in two adjacent grouting hole groups are arranged vertically.
In this embodiment, since the height of the grouting space itself is not too high, the pipe diameter of each grouting pipe is not too large, in this embodiment, the inner diameter of the front plugging grouting pipe, the rear plugging grouting pipe and the filling grouting pipe is 13mm, the outer diameter is 20mm, and the aperture of the grouting hole is 4 mm. To achieve grouting through such a thin grouting pipe, a high grouting pressure is required. The structure of preceding shutoff slip casting pipe, back shutoff slip casting pipe is the same with the structure of filling the slip casting pipe, and in order to improve the compressive capacity of slip casting pipe, the structure of slip casting pipe is as shown in figure 4, and it includes annular rubber body 15, and the middle part vulcanization of rubber body is fixed with round wire 16, and the setting of wire has improved the compressive capacity of slip casting pipe, can realize high-pressure slip casting. In addition, every slip casting punch combination only includes two slip casting holes 17 along the even interval arrangement of slip casting pipe circumference, and the slip casting hole number of setting is not many, also is favorable to guaranteeing the bulk strength of slip casting pipe, and the axis of two adjacent slip casting punch combinations is arranged perpendicularly, then is favorable to improving the range of slip casting, can realize the slip casting on all directions around the slip casting pipe.
The process is as follows: a first step; after spraying a primary tunnel support on the inner wall of a tunnel, fixing a front plugging grouting pipe, a rear plugging grouting pipe, a filling grouting pipe, a main grouting pipe and an exhaust pipe on the primary tunnel support, fixing geotextile and a waterproof plate on the primary tunnel support, pouring secondary lining concrete on the inner side of the waterproof plate, and forming a grouting space between the waterproof plate and the primary tunnel support; and thirdly, firstly, grouting between the waterproof board and the primary tunnel support by the front plugging grouting pipe and the rear plugging grouting pipe to form a closed structure at the front end and the rear end of the grouting space, then exhausting air in the grouting space through the exhaust pipe, grouting the grouting space through the main grouting pipe and each filling grouting pipe, and effectively filling the cavity between the waterproof board and the primary tunnel support by grouting material under certain pressure. In other embodiments of the present invention, the inner exhaust pipe may not be provided, and the exhaust pipe is directly connected to the filling and grouting pipe.
Example 2 of a tunnel void grouting structure is shown in fig. 7: example 2 differs from example 1 in that: the plurality of filling grouting pipes 7 are arranged at intervals in the front-rear direction, and each filling grouting pipe extends in the circumferential direction of the tunnel hole.
Example 3 of a tunnel void grouting structure is shown in fig. 8: embodiment 3 is different from embodiment 1 in that the inside of slip casting pipe does not have the vulcanization round of wire, and in order to guarantee the compressive capacity of slip casting pipe, the slip casting pipe includes annular rubber body 15, and the rubber body 15 outside is equipped with stainless steel woven mesh or basalt fiber woven mesh 15 to guarantee the compressive capacity of slip casting pipe, realize high-pressure slip casting. Adopt network structure to improve the compressive capacity of slip casting pipe, can also guarantee that the slip casting pipe can be normal complete, be suitable for on the tunnel primary support of hole unevenness fixed.
An embodiment of a method for processing holes at the outer side of a secondary tunnel lining comprises the following steps: the method comprises the following steps of, a first step; after spraying the tunnel primary support on the inner wall of the tunnel, fixing a front plugging grouting pipe, a rear plugging grouting pipe, a filling grouting pipe, a main grouting pipe and a leading-out exhaust pipe on the tunnel primary support, wherein the front plugging grouting pipe and the rear plugging grouting pipe are arranged along the circumferential direction of the top of the tunnel in an extending way, the filling grouting pipe is arranged along the front-back direction and/or in a circumferential ring arrangement way along the tunnel, grouting holes are formed in the side wall of each grouting pipe and are axially arranged at intervals along the corresponding grouting pipe, the filling grouting pipe is positioned between the front plugging grouting pipe and the rear plugging grouting pipe, one end of the main grouting pipe is connected with the filling grouting pipe, the other end is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, one end of the leading-out exhaust pipe is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, the other end of the leading-out exhaust pipe is communicated with the filling grouting pipe, or the other end of the leading-out exhaust pipe is connected with an inner side exhaust pipe positioned in the grouting space; fixing geotextile and a waterproof board on the primary tunnel support, pouring second lining concrete on the inner side of the waterproof board, and forming a grouting space between the waterproof board and the primary tunnel support; and thirdly, firstly, grouting between the waterproof plate and the primary support of the tunnel by the front plugging grouting pipe and the rear plugging grouting pipe to form a closed structure at the front end and the rear end of the grouting space, then discharging air in the grouting space through the leading-out exhaust pipe, and grouting the grouting space through the main grouting pipe and each filling grouting pipe.
Claims (6)
1. The utility model provides a tunnel cavity slip casting structure, includes the tunnel hole that extends along the fore-and-aft direction, and the spraying has the tunnel to prop up just on the inner wall in tunnel hole, and the inboard of propping up just along the way is equipped with the waterproof board, and the inboard of waterproof board is equipped with two lining concrete, its characterized in that: the grouting space is formed between the waterproof plate and the primary support of the tunnel, a front plugging grouting pipe and a rear plugging grouting pipe which are arranged at a front interval and a rear interval are arranged in the grouting space, the front plugging grouting pipe and the rear plugging grouting pipe are arranged along the circumferential extension of the top of the tunnel, filling grouting pipes which are arranged along the front direction and the rear direction and/or along the circumferential ring of the tunnel are also arranged in the grouting space, grouting holes which are arranged along the axial intervals of the corresponding grouting pipes are formed in the side wall of each grouting pipe, and a main grouting pipe which is led out from the corresponding side plugging grouting pipe is connected to each filling grouting pipe.
2. The tunnel void grouting structure according to claim 1, wherein: and a plurality of filling grouting pipes extending in the front-back direction are further arranged in the grouting space, and the filling grouting pipes are circumferentially arranged at intervals along the tunnel hole.
3. The tunnel void grouting structure according to claim 1, wherein: and a plurality of filling grouting pipes which are arranged along the circumferential direction of the tunnel in an annular mode are further arranged in the grouting space, and the filling grouting pipes are arranged at intervals along the front-back direction.
4. The tunnel void grouting structure according to claim 1, wherein: the tunnel cavity grouting structure further comprises a leading-out exhaust pipe, one end of the leading-out exhaust pipe is led out from the corresponding plugging grouting pipe, the other end of the leading-out exhaust pipe is communicated with the filling grouting pipe, or the other end of the exhaust pipe is connected with an inner side exhaust pipe located in the grouting space.
5. The tunnel void grouting structure according to claim 1, wherein: the grouting holes in the grouting pipes are arranged in the axial direction corresponding to the grouting pipes to form a plurality of grouting hole groups, each grouting hole group comprises two grouting holes which are circumferentially arranged at intervals along the grouting pipes, the two grouting holes in the same grouting hole group are coaxially arranged, and the axes of the grouting holes in the two adjacent grouting hole groups are vertically arranged.
6. A method for processing holes on the outer side of a tunnel waterproof plate is characterized by comprising the following steps: the method comprises the following steps of, a first step; after spraying the tunnel primary support on the inner wall of the tunnel, fixing a front plugging grouting pipe, a rear plugging grouting pipe, a filling grouting pipe, a main grouting pipe and a leading-out exhaust pipe on the tunnel primary support, wherein the front plugging grouting pipe and the rear plugging grouting pipe are arranged along the circumferential direction of the top of the tunnel in an extending way, the filling grouting pipe is arranged along the front-back direction and/or in a circumferential ring arrangement way along the tunnel, grouting holes are formed in the side wall of each grouting pipe and are axially arranged at intervals along the corresponding grouting pipe, the filling grouting pipe is positioned between the front plugging grouting pipe and the rear plugging grouting pipe, one end of the main grouting pipe is connected with the filling grouting pipe, the other end is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, one end of the leading-out exhaust pipe is led out from the front side of the front plugging grouting pipe or the rear side of the rear plugging grouting pipe, the other end of the leading-out exhaust pipe is communicated with the filling grouting pipe, or the other end of the leading-out exhaust pipe is connected with an inner side exhaust pipe positioned in the grouting space; fixing geotextile and a waterproof board on the primary tunnel support, pouring second lining concrete on the inner side of the waterproof board, and forming a grouting space between the waterproof board and the primary tunnel support; and thirdly, firstly, grouting between the waterproof plate and the primary support of the tunnel by the front plugging grouting pipe and the rear plugging grouting pipe to form a closed structure at the front end and the rear end of the grouting space, then discharging air in the grouting space through the leading-out exhaust pipe, and grouting the grouting space through the main grouting pipe and each filling grouting pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911364869.3A CN110792455B (en) | 2019-12-26 | 2019-12-26 | Tunnel waterproof board outer side cavity processing method and tunnel cavity grouting structure |
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| CN201911364869.3A CN110792455B (en) | 2019-12-26 | 2019-12-26 | Tunnel waterproof board outer side cavity processing method and tunnel cavity grouting structure |
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| CN110792455B CN110792455B (en) | 2020-12-15 |
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Cited By (1)
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|---|---|---|---|---|
| CN113279785A (en) * | 2021-07-08 | 2021-08-20 | 中交一公局第一工程有限公司 | Method and device for processing vault hollow hole and local loose part of secondary lining of tunnel |
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| CN110792455B (en) | 2020-12-15 |
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