CN111810202B - Underground connecting channel interface construction method - Google Patents
Underground connecting channel interface construction method Download PDFInfo
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- CN111810202B CN111810202B CN202010698356.2A CN202010698356A CN111810202B CN 111810202 B CN111810202 B CN 111810202B CN 202010698356 A CN202010698356 A CN 202010698356A CN 111810202 B CN111810202 B CN 111810202B
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 238000009412 basement excavation Methods 0.000 claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 239000002689 soil Substances 0.000 claims abstract description 38
- 238000004891 communication Methods 0.000 claims abstract description 24
- 239000002344 surface layer Substances 0.000 claims abstract description 7
- 230000002787 reinforcement Effects 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 13
- 239000004567 concrete Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 1
- 239000011378 shotcrete Substances 0.000 description 3
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005056 compaction 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
- E21D13/00—Large underground chambers; Methods or apparatus for making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
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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
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a construction method of an underground connecting channel interface, which comprises the following steps: looking up a drawing, and measuring paying off; hardening the surface layer; arranging a guide pipe to drain and guide soil at the interface of the communication channel; the connection channel interface on the inner side of the basement supporting structure is constructed by open cut, a plurality of layers of I-shaped steel A are arranged between the outer wall of the basement and the basement supporting structure, and all the I-shaped steel A are connected through connecting ribs; and the connection channel interface on the outer side of the basement supporting structure is constructed by underground excavation. The invention has the beneficial effects that: the construction method of the invention fully utilizes the existing structures such as basement outer wall and basement supporting structure as the stressed body to support the supporting structure of the connection channel interface, compared with the prior art, the construction method of the invention saves time and labor, greatly reduces the construction cost and improves the construction progress.
Description
Technical Field
The invention relates to the technical field of underground space support, in particular to a construction method of an underground space connection interface.
Background
The construction of urban underground space is started, so that the underground structure shows diversified development. Under the action of the underground enclosing structure, the newly-built underground spaces are mutually independent and closed, and the communication between the underground spaces is blocked. To facilitate communication between subterranean spaces, communication channels and interfaces are typically provided between two subterranean spaces, while existing support structures between the two interfaces must be traversed. The arrangement of the connection interface can not be separated from the supporting structure, and the underground interface construction generally adopts a subsurface excavation method.
After the underground structure is built, the supporting structure is retired, and earth backfilling is carried out between the supporting structure and the built structure. The quality of the compaction degree of the backfill soil is difficult to ensure under the influence of construction space and human factors, so that the porosity among soil bodies is large. After the underground structure is put into use, the pore portions are filled with water. An underground connection interface is arranged in a backfill area, underground excavation is carried out by adopting an underground excavation method, the water content of a soil body is high, the stability is poor, the underground operable space is small, the excavation difficulty is large, the construction cost is high, the construction period is long, and the normal operation of the built area can be seriously influenced.
Disclosure of Invention
The invention aims to provide a construction method for an underground space communication channel interface by utilizing the existing structural support, which has good stability and is difficult to construct, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a construction method of an underground connecting channel interface comprises the following steps:
step one, looking up a drawing, measuring and paying off: looking up the built underground passage and basement drawings, service life and supporting structure forms, investigating the conditions of peripheral pipelines and underground water level, and measuring and releasing an excavation contour line of a to-be-constructed contact passage interface;
step two, hardening the surface layer: cleaning surface soil along the excavation contour line of the connection channel interface, excavating to the top elevation of the basement and the basement supporting structure, hardening the periphery of the excavated soil, and simultaneously arranging a 300mm multiplied by 300mm intercepting ditch;
step three, arranging a flow guide pipe, and draining and guiding soil at the interface of the connecting channel;
step four, open cut section construction: the connection channel interface on the inner side of the basement supporting structure adopts open cut construction, and is an open cut section; the connection channel interface at the outer side of the basement supporting structure is constructed by underground excavation and is an underground excavation section;
a. installing a first section of I-shaped steel A: a first section of I-shaped steel A is arranged between the basement outer wall and the basement supporting structure, and connecting ribs are arranged on the inner side and the outer side of the I-shaped steel A, extend downwards and are used for being connected with the I-shaped steel A on the lower portion;
b. advanced small catheter support: arranging a small advanced guide pipe below the first section of I-shaped steel A to support the first section of I-shaped steel A; the leading small guide pipe is provided with a grouting hole;
c. earth excavation and supporting: excavating a soil body to the elevation of a second section of I-shaped steel A, installing the second section of I-shaped steel A, and welding the first section of I-shaped steel A and the second section of I-shaped steel A through connecting ribs on the inner side and the outer side; concrete spraying is carried out after reinforcing mesh sheets are arranged on the surface layers of the connecting ribs; injecting cement water glass double-liquid slurry into the small leading conduit after the strength of the concrete reaches 80%; vertically excavating roof trusses to the top of the connection channel interface according to the method;
d. reinforcing two sides: reinforcing soil bodies on two sides from the inner side of the connection channel interface, drilling double-row-hole outer guide pipes along two sides of the open excavation section of the connection channel interface, and respectively embedding two ends of the double-row-hole outer guide pipes into the outer wall of the basement and the interior of the basement supporting structure; injecting double-slurry into the double-row hole outer guide pipe to reinforce soil bodies on two sides of the open cut section of the connection channel interface;
e. grouting and reinforcing the whole section: through the basement outer wall, small pipes on the opening surface are uniformly arranged on the whole opening surface in the transverse direction and the longitudinal direction at intervals for integral grouting reinforcement, so that the soil body on the excavation surface is solidified, and collapse in the excavation process is avoided; after full-face grouting is finished, vertically excavating pin by pin, and supporting pin by pin to the bottom elevation of an open excavation section of a connection channel interface;
step five, synchronously constructing an underground excavation section;
a. constructing a pipe shed and grouting: arranging single-row lateral pipe sheds on two sides of the underground excavation section of the connection channel interface along the contour line of the opening, arranging double-row top pipe sheds on the top of the underground excavation section of the connection channel interface along the contour line of the opening, and embedding two ends of each pipe shed into a basement supporting structure and an underground channel outer wall respectively for grouting reinforcement; after grouting, performing full-section grouting reinforcement on the excavation surface of the opening;
b. earth excavation: the underground excavation section is divided into regions from top to bottom for earth excavation, the soil excavation section is horizontally pushed forward to expose the large pipe shed on the excavation surface, small lateral guide pipes are driven into the large pipe shed through gaps of the large pipe shed in the lateral direction, and the large pipe shed and the small lateral guide pipes are welded firmly; the large pipe sheds are welded annularly through I-shaped steel B, and reinforcing steel meshes are laid among the I-shaped steel B and concrete is sprayed.
c. Breaking a supporting structure: when the underground excavation section is constructed to a supporting structure, two circles of annular I-shaped steel and two vertical supports are arranged in parallel for reinforcement; and breaking the supporting structure section by section, and adjusting the breaking progress according to the deformation monitoring condition.
According to the scheme, in the second step, the periphery of the excavated soil body is hardened, and meanwhile, the top of the connection channel interface is provided with the intercepting ditch.
According to the scheme, in the third step, holes are formed from the bottoms of the underground passage and the two sides of the basement to the direction of the connection passage connector, and pipelines are installed to serve as flow guide pipes.
According to the scheme, in the step four (b), the top area of the communication channel interface expands outwards towards two sides.
According to the scheme, in the step four (d), double-row-hole outer guide pipes are injected with double-liquid slurry to reinforce soil bodies on two sides of the open cut section of the connecting channel connector, and the slurry injection amount is increased close to two sides of the bottom of the connector to form a slurry injection strengthening area.
According to the scheme, in the step five (a), a middle guide pipe is added between adjacent steel pipes in the lateral pipe shed; an intermediate conduit is added between adjacent steel pipes in the top pipe shed; the two ends of the guide pipe are respectively embedded into the basement supporting structure and the outer wall of the underground passage.
The invention has the beneficial effects that: the construction method of the invention fully utilizes the existing structures such as basement outer wall and basement supporting structure as the stressed body to support the supporting structure of the connection channel interface, compared with the prior art, the construction method of the invention saves time and labor, greatly reduces the construction cost and improves the construction progress; in the construction method, the communication channel on the inner side of the basement supporting structure adopts an open excavation mode, the communication channel on the outer side of the basement supporting structure adopts a subsurface excavation mode, and the open excavation mode and the subsurface excavation mode are combined.
Drawings
Fig. 1 is a plan view of a communication channel interface according to an embodiment of the present invention.
Fig. 2 is an elevation view of the communication channel interface in the present embodiment.
Fig. 3 is a schematic diagram of the support of the open-cut section of the communication channel interface in this embodiment.
Fig. 4 is a schematic diagram of the support of the underground excavation section of the connection channel interface in the embodiment.
Wherein: 1. a basement exterior wall; 2. an underground passage outer wall; 3. a contact channel interface; 4. a basement support structure; 5. a basement floor; 6. a flow guide pipe; 7. a top plate of the underground passage; 8. i-shaped steel; 9. a wall connecting piece; 10. a leading small catheter A; 11. a leading small catheter B; 12. intercepting a ditch; 13. an extracavernous conduit; 14. a grouting reinforcement area; 15. a small conduit on the opening surface; 16. a steel pipe; 17. an intermediate conduit; 18. a connecting section; 19. a basement roof; 20. underpan of underground passage.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A communication channel interface 3 is established between the two established underground spaces. In this embodiment, as shown in fig. 1, the two underground spaces are specifically a basement and an underground passage (a basement top plate 19, a basement bottom plate 5, an underground passage bottom plate 20, and an underground passage top plate 7 are shown in fig. 2), the connection passage interface 3 is constructed between the two underground spaces, and the construction method of the underground connection passage interface 3 includes the following steps:
step one, looking up a drawing, measuring and paying off: and (3) consulting drawings, service lives and supporting structure forms of the built underground passages and basements, investigating the conditions of peripheral pipelines and underground water levels, and measuring and releasing the excavation contour lines of the to-be-constructed contact passage joints 3. In this embodiment, as shown in fig. 1, the connection channel interface 3 inside the basement supporting structure 4 is constructed by open cut, which is an open cut section, and 1m is placed outside the upper part of the open cut section to expand the construction space; the connection channel interface 3 at the outer side of the basement supporting structure 4 adopts underground excavation construction, and is an underground excavation section; the basement support structure 4 is specifically a support pile.
Step two, hardening the surface layer: cleaning surface soil along the excavation contour line of the connection channel connector 3, excavating to the top elevation of the basement and the basement supporting structure 4, hardening the periphery of the excavation soil, and simultaneously arranging a water interception ditch 12 with the section size of 300mm multiplied by 300 mm;
step three, arranging a flow guide pipe 6, draining and guiding the soil body at the connecting passage interface 3: under the long-term influence of an external water source, soil between the underground passage outer wall 2 and the basement outer wall 1 is in a saturated state, and drainage treatment is needed before excavation; holes (the hole diameter is 300mm, and the proper hole diameter is selected according to the water flow) are formed from the bottoms of the two sides of the underground passage bottom plate 20 and the basement bottom plate 5 to the direction of the contact passage connector 3, and pipelines are installed to be used as a guide pipe 6, so that the drainage and flow guide are carried out on the soil body in the middle area of the structure, namely the soil body at the contact passage connector 3.
Step four, open cut section construction:
a. installing a first section of I-steel A8 between the basement outer wall 1 and the basement supporting structure 4, as shown in figures 2 and 3: 22a I-shaped steel is adopted and connected with the basement outer wall 1 and the basement supporting structure 4 through the wall connecting pieces 9 at the two ends; the wall connecting piece 9 is a 20mm thick steel plate with holes distributed at four corners, and expansion bolts driven into the holes are connected with the existing structure to ensure firm connection; the inner side and the outer side of the I-shaped steel A8 are both provided with phi 22 connecting ribs and extend downwards (for connecting with the I-shaped steel A8 at the lower part).
b. Advanced small catheter support: arranging a small advanced guide pipe below the first H-shaped steel A8 to support the first H-shaped steel A8; the small advanced guide pipes are arranged at intervals along the length direction of the first section of I-shaped steel A8 and are integrally arranged in a quincunx shape; multiple rings of integrally quincunx grouting holes are arranged on the outer peripheral surface of the advanced small guide pipe at intervals along the axial direction of the advanced small guide pipe. In the embodiment, considering that the plane size of the connection channel interface 3 is generally small, the top area of the connection channel interface 3 expands outwards towards two sides, and the site construction is convenient, and the I-steel A8 at the expanded position adopts a phi 42 multiplied by 3.25 advanced small conduit A10 with the length of 1.5m to support the I-steel A8. When the soil body of the joint part is excavated, the excavation surface is retracted, and the I-steel A8 at the retracted position adopts a small advanced guide pipe B11 with the diameter of 42 multiplied by 3.25 and the length of 2.0m to support the I-steel A8); two leading small catheters are arranged at a distance of 0.75 m; the external expansion part is connected with the internal contraction part through a connecting section 18; the annular distance of the grouting holes is 0.2m, and the aperture of the grouting holes is 5 mm.
c. Earth excavation and supporting: excavating a soil body to a second H-shaped steel A8 elevation, connecting the second H-shaped steel A8 between the basement outer wall 1 and the basement supporting structure 4 through a wall connecting piece 9, and welding a first H-shaped steel A8 and a second H-shaped steel A8 through connecting ribs of phi 22@300 on the inner side and the outer side; the surface layer of the connecting rib is provided with a phi 8@150 multiplied by 150 reinforcing mesh, and concrete spraying is carried out after the installation is finished, wherein the concrete is marked with a C20 and the thickness is 350 mm; injecting cement water glass double-liquid slurry into the small leading conduit after the strength of the concrete reaches 80%; and vertically excavating to the top of the connecting channel connector 3 by roof trusses according to the method. In this embodiment, the pieces of i-steel A8 are arranged at equal intervals of 0.75m in the height direction.
d. Reinforcing two sides: while supporting the soil body at the upper part of the open cut section of the communication channel interface 3, reinforcing the soil bodies at two sides from the inner side of the communication channel interface 3, respectively drilling double-row hole outer guide pipes 13 along two sides of the open cut section of the communication channel interface 3, and respectively embedding two ends of the double-row hole outer guide pipes 13 into the basement outer wall 1 and the basement supporting structure 4; the double-row hole outer guide pipe 13 is filled with double-liquid slurry to reinforce soil bodies on two sides of the open cut section of the connection channel connector 3, the two sides close to the bottom of the connector are increased in grouting amount, and a grouting reinforcement area 14 is formed. In this embodiment, the specification of the double-row-hole outer conduit 13 is phi 42 × 3.25, the length is 2.5m, and the distance is 0.3m × 1 m.
e. Grouting and reinforcing the whole section: through the basement outer wall 1, the small ducts 15 on the opening surface are uniformly arranged in the transverse direction and the longitudinal direction of the whole opening surface at intervals for integral grouting reinforcement, so that the soil body on the excavation surface is solidified, and collapse in the excavation process is avoided; after the full-face grouting is finished, vertically excavating roof truss by roof truss, and supporting roof truss by roof truss to the bottom elevation of the open excavation section of the connection channel connector 3. In this embodiment, the small ducts 15 with a hole surface of phi 42 × 3.25, L of 2.0m and 500mm × 1000mm (transverse interval × longitudinal interval) are arranged on the hole surface of the open cut section.
Step five, synchronously constructing underground excavation sections in the open excavation process;
a. constructing a pipe shed and grouting: as shown in fig. 4, a single row of lateral pipe sheds are arranged on two sides of the underground excavation section of the connection channel interface 3 along the contour line of the opening, and a middle guide pipe 17 is added between adjacent steel pipes 16 in the lateral pipe sheds; arranging double rows of top pipe sheds at the top of the underground excavation section of the connection channel connector 3 along the contour of the opening, and supplementing an intermediate conduit 17 between adjacent steel pipes 16 in the top pipe sheds; the two pipe sheds are annularly provided with grouting holes in a quincunx shape. The two ends of the lateral pipe shed, the top pipe shed and the middle conduit 17 are respectively embedded into the basement supporting structure 4 and the underground passage outer wall 2, and double-liquid slurry is injected into the pipes; and after the grouting of the pipe shed is finished, performing full-section grouting reinforcement on the excavation surface of the opening.
In the embodiment, the size of the steel pipes 16 in the large pipe shed is 108 multiplied by 8mm, and the horizontal distance between the adjacent steel pipes 16 is 500 mm; the row spacing of the steel pipes 16 in the double-row large pipe shed is 350 mm; the aperture of big pipe-shed slip casting hole is 10mm, and the hoop symmetry sets up 4 holes, encircles along length direction 0.3 m.
b. Earth excavation: the underground excavation section is divided into regions from top to bottom for earth excavation, the soil excavation section is horizontally pushed forward to expose the large pipe shed on the excavation surface, small lateral guide pipes are driven into the large pipe shed through gaps of the large pipe shed in the lateral direction, and the large pipe shed and the small lateral guide pipes are welded firmly; the large pipe sheds are welded circumferentially at a horizontal interval of 1.5m by 22a I-steel B, and reinforcing steel meshes are laid among the I-steel B and concrete is sprayed. According to the interval size between underground passage and basement supporting construction 4, set up vertical steel shotcrete, the level sets up horizontal steel shotcrete to equidistant. And injecting double-fluid slurry into the small lateral guide pipe according to the stable condition of the excavation surface. In the embodiment, the specification of the lateral small conduit is phi 42 multiplied by 3.25, and the length is 2.0 m; the transverse spacing of the small ducts is 500mm and the longitudinal spacing is 1000 mm.
c. Breaking a supporting structure: when the underground excavation section is constructed to a supporting structure, two circles of annular I-shaped steel and two vertical supports are arranged in parallel for reinforcement; and breaking the supporting structure section by section, and adjusting the breaking progress according to the deformation monitoring condition.
In the invention, the open cut section uses the existing supporting structure and the outer wall as a stress body, the upper part of the open cut section forms a plane stress body by I-steel A8, a reinforcing mesh and concrete, the bottom of the communication channel interface 3 is grouted and reinforced by adopting a full-section closed grouting mode, and the two sides are provided with double-row-hole outer guide pipes 13 for blocking and strengthening; the underground excavation section adopts the mode of circumferential reinforcement of a large pipe shed and closed grouting of the whole section of the excavation surface, so that the one-time reinforcement of the underground excavation section is completed, and a stable stress body is formed. According to the invention, the diversion holes are formed in the bottom of the constructed structure to conduct diversion on the backfill area, so that the construction process is simple, and the engineering risk can be reduced; small guide pipes are horizontally arranged on two sides of the connector in a driving mode, a blocking effect is formed on soil bodies in the driving area, and meanwhile grouting reinforcement areas are arranged on foot points on two sides, so that deformation of a supporting structure is reduced. The underground excavation area is provided with an annular large pipe shed which is connected through I-shaped steel B and sprayed concrete to form a stable stress body; the primary underground support is supported by an annular large pipe shed, existing structures at two ends are used as stress bodies, the large pipe shed is reinforced annularly by I-shaped steel and sprayed with concrete, roof truss-by-roof truss excavation and roof truss-by-roof truss support are avoided, the primary support is completed at one time, and meanwhile structural stability is improved.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (6)
1. A construction method for an underground communication channel interface is characterized by comprising the following steps:
step one, looking up a drawing, measuring and paying off: looking up the built underground passage and basement drawings, service life and supporting structure forms, investigating the conditions of peripheral pipelines and underground water level, and measuring and releasing an excavation contour line of a to-be-constructed contact passage interface;
step two, hardening the surface layer: cleaning surface soil along the excavation contour line of the connection channel interface, excavating to the top elevation of the basement and the basement supporting structure, hardening the periphery of the excavated soil, and simultaneously arranging a 300mm multiplied by 300mm intercepting ditch;
step three, arranging a flow guide pipe, and draining and guiding soil at the interface of the connecting channel;
step four, open cut section construction: the connection channel interface on the inner side of the basement supporting structure adopts open cut construction, and is an open cut section; the connection channel interface at the outer side of the basement supporting structure is constructed by underground excavation and is an underground excavation section;
a. installing a first section of I-shaped steel A: a first section of I-shaped steel A is arranged between the basement outer wall and the basement supporting structure, and connecting ribs are arranged on the inner side and the outer side of the I-shaped steel A, extend downwards and are used for being connected with the I-shaped steel A on the lower portion;
b. advanced small catheter support: arranging a small advanced guide pipe below the first section of I-shaped steel A to support the first section of I-shaped steel A; a grouting hole is arranged on the leading small guide pipe;
c. earth excavation and supporting: excavating a soil body to the elevation of a second section of I-shaped steel A, installing the second section of I-shaped steel A, and welding the first section of I-shaped steel A and the second section of I-shaped steel A through connecting ribs on the inner side and the outer side; concrete spraying is carried out after reinforcing mesh sheets are arranged on the surface layers of the connecting ribs; injecting cement water glass double-liquid slurry into the small leading conduit after the strength of the concrete reaches 80%; vertically excavating roof trusses to the top of the connection channel interface according to the method;
d. reinforcing two sides: reinforcing soil bodies on two sides from the inner side of the connection channel interface, drilling double-row-hole outer guide pipes along two sides of the open excavation section of the connection channel interface, and respectively embedding two ends of the double-row-hole outer guide pipes into the outer wall of the basement and the interior of the basement supporting structure; injecting double-slurry into the double-row hole outer guide pipe to reinforce soil bodies on two sides of the open cut section of the connection channel interface;
e. grouting and reinforcing the whole section: through the basement outer wall, small pipes on the opening surface are uniformly arranged on the whole opening surface in the transverse direction and the longitudinal direction at intervals for integral grouting reinforcement, so that the soil body on the excavation surface is solidified, and collapse in the excavation process is avoided; after full-face grouting is finished, vertically excavating pin by pin, and supporting pin by pin to the bottom elevation of an open excavation section of a connection channel interface;
step five, synchronously constructing an underground excavation section;
a. constructing a pipe shed and grouting: arranging single-row lateral pipe sheds on two sides of the underground excavation section of the connection channel interface along the contour line of the opening, arranging double-row top pipe sheds on the top of the underground excavation section of the connection channel interface along the contour line of the opening, and embedding two ends of each pipe shed into a basement supporting structure and an underground channel outer wall respectively for grouting reinforcement; after grouting, performing full-section grouting reinforcement on the excavation surface of the opening;
b. earth excavation: the underground excavation section is divided into regions from top to bottom for earth excavation, the soil excavation section is horizontally pushed forward to expose the large pipe shed on the excavation surface, small lateral guide pipes are driven into the large pipe shed through gaps of the large pipe shed in the lateral direction, and the large pipe shed and the small lateral guide pipes are welded firmly; the large pipe sheds are welded annularly through I-shaped steel B, and reinforcing steel meshes are laid among the I-shaped steel B and concrete is sprayed;
c. breaking a supporting structure: when the underground excavation section is constructed to a supporting structure, two circles of annular I-shaped steel and two vertical supports are arranged in parallel for reinforcement; and breaking the supporting structure section by section, and adjusting the breaking progress according to the deformation monitoring condition.
2. The underground communication channel joint construction method as claimed in claim 1, wherein in the second step, the periphery of the excavated soil is hardened, and a catch basin is provided at the top of the communication channel joint.
3. The underground connecting passage joint construction method of claim 1, wherein in step three, holes are respectively formed from the bottom of the underground passage to the connecting passage joint direction and from the bottom of the basement to the connecting passage joint direction, and pipelines are installed to serve as guide pipes.
4. The underground communication channel joint construction method as claimed in claim 1, wherein in the fourth step (b), the top area of the communication channel joint is expanded outward to both sides.
5. The underground communication channel joint construction method as claimed in claim 1, wherein in the fourth step (d), the double-row-hole outer guide pipe is filled with double-slurry to reinforce soil bodies on two sides of the open cut section of the communication channel joint, and the slurry filling amount is increased near two sides of the bottom of the joint to form a slurry filling reinforced area.
6. The underground communication channel joint construction method as claimed in claim 1, wherein in the fifth step (a), an intermediate conduit is added between adjacent steel pipes in the lateral pipe sheds; an intermediate conduit is added between adjacent steel pipes in the top pipe shed; the two ends of the guide pipe are respectively embedded into the basement supporting structure and the outer wall of the underground passage.
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| CN114000445B (en) * | 2021-11-16 | 2022-09-13 | 北京泽通水务建设有限公司 | Construction method for multi-hole side-by-side crossing hidden culvert |
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