CN111379576A - Method for connecting primary support and large-diameter pipe shed in shed cover construction - Google Patents
Method for connecting primary support and large-diameter pipe shed in shed cover construction Download PDFInfo
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- CN111379576A CN111379576A CN202010017467.2A CN202010017467A CN111379576A CN 111379576 A CN111379576 A CN 111379576A CN 202010017467 A CN202010017467 A CN 202010017467A CN 111379576 A CN111379576 A CN 111379576A
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- shed
- steel
- pipe shed
- pipe
- adjusting piece
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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
- E21D11/14—Lining predominantly with metal
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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
- E21D11/14—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
- 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Abstract
The invention discloses a method for connecting primary supports and a large-diameter pipe shed during shed-cover construction, which can effectively connect the primary supports of side walls and the pipe shed together without constructing the primary supports at the top of a pilot tunnel during shed-cover construction. The connecting method comprises the steps that connecting pieces are arranged at the bottoms of pipe sheds in the underground excavation pilot tunnels, each connecting piece comprises an arc-shaped supporting plate and a baffle, and the supporting plates are connected with the pipe sheds in a welding mode and the supporting plates are connected with the baffles in a welding mode; the lower part of the connecting piece is provided with a base plate, the base plate is a thick steel plate processed according to the design size, and the specific number is reasonably configured according to the distance between the pipe shed and the adjusting piece; the lower part of the base plate is provided with an adjusting piece, and the adjusting piece can be made of I-shaped steel or square steel according to different types of steel frames; the adjusting piece is connected with the primary support steel frame through a bolt. The method effectively exerts the bearing capacity of the large-diameter pipe shed, the top of the pilot tunnel does not need to be provided with the primary support, the pipe shed and the primary support are integrated, the stability in the pilot tunnel is ensured, the construction procedures are few, the method is rapid and simple, and the construction period and the materials are saved.
Description
Technical Field
The invention relates to the field of underground cavern construction, in particular to a method for connecting a primary support of a grid and a large-diameter pipe shed in shed-cover construction
Background
With the rapid development of economy and urbanization construction in recent years, the development and utilization of urban underground space become the key point of the development of big cities in China at present and in a period of time in the future. Subways now become a very important traffic mode for occupying space in urban rail transit, and meanwhile, due to the fact that the underground space environment is complex, especially in densely populated areas, the underground space development generally needs to face various problems such as old and dangerous houses, underground pipelines, environment protection and people disturbance avoidance. How to reduce disturbance to surrounding buildings (structures) as far as possible and ensure normal traffic running of the earth surface is a problem to be solved urgently in underground space development on the premise of ensuring safe construction.
When underground excavation construction of a subway is carried out, a pipe shed advanced supporting method is proposed in Japan, and specifically, a row of steel pipes are jacked in advance at the periphery of an underground structure body, and meanwhile, the side faces of the steel pipes are sequentially connected by using lock catches, so that the whole pipe shed forms an advanced support capable of resisting loads of soil bodies and the like on the upper part of the structure, and a curtain is generated between the underground structure body and surrounding water and soil bodies, thereby reducing the influence on ground roads, pipelines, buildings and the like in the construction process, ensuring normal traffic of the ground, ensuring normal use of the existing structure and safe construction of a newly-built structure.
When the shallow-buried underground excavation method is used for construction, an advanced pre-supporting method is generally adopted to pre-reinforce an upper body in front of excavation so as to support ground load and prevent a tunnel from collapsing to affect the ground surface when excavation is carried out due to a thin covering layer. The pipe-shed method is a common method for stabilizing the stratum in a large range, namely, controlling the surrounding rock to be loose and preventing the ground surface from sinking in a shallow tunnel. During construction of the tunnel with soft surrounding rocks, horizontal diffusion holes are arranged in an externally inserted manner at certain intervals along a tunnel axis and at certain externally inserted angles along the tunnel axis before the tunnel is excavated on a working face (in special cases, the horizontal diffusion holes can also be drilled along the side wall profile), a steel pipe is pushed in after the holes are formed, cement mortar is injected into the steel pipe by pressing or mortar injecting or a reinforcement cage is arranged, the shearing strength of the surrounding rocks is increased, the pipe shed and the surrounding rocks form a steel pipe shed frame system, a hole system pipe shed is formed to serve as an advance support, and primary support and permanent lining are carried out at the excavation edge under the advance support condition.
In the prior art, settlement is controlled by mostly adopting a dynamic construction method that a small-diameter pipe shed (the pipe diameter is only 79-129 mm) and a grid arch are matched with a short footage in engineering; for urban ultra-shallow underground excavation stations, due to the complexity of the surrounding environment of the stations, the small-diameter pipe sheds are no longer suitable for the projects, and the connection between the large-diameter pipe sheds and the preliminary support of the pilot tunnel is not reported. Based on the method, the method for connecting the large-diameter pipe shed and the preliminary support of the pilot tunnel can give full play to the bearing capacity of the large-diameter pipe shed.
Disclosure of Invention
The invention aims to provide a method for connecting a primary support of a grid and a large-diameter pipe shed in the construction of the grid by a shed cover method, which can give full play to the bearing capacity of the large-diameter pipe shed, does not need to construct the primary support at the top of a pilot tunnel, greatly saves the construction period and materials, and is suitable for the connection of the large-diameter pipe shed and the primary support.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for connecting primary support of a grid and a large-diameter pipe shed in the construction of the grid by a shed cover method comprises the following steps: the large-diameter pipe shed, the arc layer board, the baffle, the backing plate, adjusting part, preliminary bracing steelframe, reinforcing bar net piece, lock foot anchor pipe, longitudinal tie bar.
The invention provides a method for connecting a primary support and a large-diameter pipe shed, which comprises the following steps:
step one, constructing a large pipe shed (1), and forming a shed cover system by the pipe shed after construction;
step two, excavating a pilot tunnel, constructing an arc-shaped supporting plate (2) on the soil facing side and a baffle (3) when excavating to the arrangement position of a primary support steel frame, laying a reinforcing mesh (7) along the side wall of the pilot tunnel, erecting steel arches (6) on two sides, driving a locking anchor pipe (8) and installing a longitudinal connecting rib (9);
step three, mounting an adjusting piece (5), and filling and jacking a gap between the adjusting piece (5) and the arc-shaped supporting plate (2) by using a cushion block (4);
and step four, installing the back soil side arc-shaped supporting plate (2) and the baffle (3).
When the pilot tunnel is excavated, the tunnel is excavated along the outline of the large pipe shed, and the residual soil on the bottom surface of the large pipe shed is cleaned.
The size of the arc-shaped supporting plate is manufactured in advance according to the size of the large pipe shed, and the arc-shaped supporting plate is welded with the large pipe shed in a through-length mode after being attached to the large pipe shed in a close mode, so that reliable connection is guaranteed.
The steel arch can be selected from a profile steel arch or a grating arch, and different steel arches correspond to different adjusting pieces; when the steel arch is selected as the grid arch, the adjusting piece is the section steel, and the adjusting piece and the grid arch are connected through the thick steel plate and the bolts; when the steel arch centering is selected to be the section steel arch centering, the adjusting piece is the square steel, the adjusting piece and the section steel arch centering are connected through the bolt and the thick steel plate, the I-shaped steel is inserted into the square steel, the rigidity of the connecting piece is increased, and the vertical force transmission is guaranteed.
When the horizontal axis of big pipe shed deviates for big pipe shed axis and the vertical out of plumb of station, for guaranteeing the effective connection of preliminary bracing and big pipe shed, through the step of adjustment both sides steelframe, ensure that both sides steelframe supports under the pipe curtain.
When the large pipe shed has an upward deviation phenomenon, the length of an adjusting piece between the steel grating on the two sides of the side opening and the pipe curtain and the number of cushion blocks are adjusted according to the actually measured deviation value, so that the steel frame and the large pipe shed are tightly propped and firmly wedged; when the pipe shed is inclined to the side, the steel frames are effectively connected with the upper pipe shed by adjusting the lengths of the steel frames at the two sides and the quantity of the cushion blocks.
The total thickness of the cushion block does not exceed 100mm, and the baffle is closely attached to the adjusting piece.
The invention has the advantages and positive effects that:
(1) the invention effectively exerts the bearing capacity of the large-diameter pipe shed, does not need to construct primary support at the top of the pilot tunnel, and the large-diameter pipe shed, the side wall and the inverted arch primary support form a closed system, thereby ensuring the safety in the construction period;
(2) the baffle can restrain the lateral displacement of pilot tunnel to a certain extent, improves the stability of pilot tunnel, and the effectual surrounding rock of restraining warp. (3) The method has the advantages of less construction procedures, rapidness, simplicity, construction period and material saving and higher economy.
Drawings
FIG. 1 is a front view of the joint connection of the arc pallet and the baffle of the present invention.
FIG. 2 is a side view of the nodal connection of the arcuate pallet and baffle of the present invention.
Fig. 3a is a front view of a detailed node diagram of the present invention.
Fig. 3b is a side view of a detailed view of the node of the present invention.
Fig. 4a is a front view of a detail view of the node of the present invention.
Fig. 4b is a side view of a detail of the node of the present invention.
The component, material numbering in the drawings is as follows:
1. a large-diameter pipe shed; 2. an arc-shaped supporting plate; 3. a baffle plate; 4. a base plate; 5. a profile steel adjusting part; 6. a square steel regulating member; 7. inserting I-shaped steel; 8. a bolt; 9. a steel plate; 10. a section steel stiffener; 11. a section steel frame;
12. a grid steel frame; 13. sprayed concrete
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A method for connecting a primary support and a large-diameter pipe shed in shed cover construction is characterized in that a connecting component comprises a large pipe shed (1), an arc-shaped supporting plate (2), a baffle plate (3), a base plate (4), a regulating part (5), a primary support steel frame (6), a reinforcing mesh (7), a locking pin anchor pipe (8) and a longitudinal connecting rib (9); constructing the large-diameter pipe shed (1), and forming a shed cover system by the pipe shed after construction; excavating a pilot tunnel, constructing an arc-shaped supporting plate (2) on the soil facing side and a baffle (3) when excavating to the arrangement position of a primary support steel frame, laying a reinforcing mesh (7) along the side wall of the pilot tunnel, erecting steel arches (6) on two sides, driving a locking anchor pipe (8) and installing a longitudinal connecting rib (9); installing an adjusting piece (5), and filling and jacking a gap between the adjusting piece (5) and the arc-shaped supporting plate (2) by using a cushion block (4); and installing a back soil side arc-shaped supporting plate (2) and a baffle (3).
Referring to fig. 1 and 2, after the excavation on the upper part of the pilot tunnel is completed, the surface residual soil at the bottom of the pipe shed is cleaned, the pipe shed is closely attached to the arc-shaped supporting plate on the soil facing side for through-length welding, and the trapezoidal baffle plate is welded on the arc-shaped supporting plate.
When the primary support is a profile steel arch, referring to fig. 3a-3b, after the installation of the arc-shaped supporting plate on the soil facing side and the baffle is finished, laying a steel bar net sheet, erecting profile steel frames on two sides (the length of the profile steel frame can be adjusted according to the actual elevation of the pipe curtain, so that the distance between a square pipe and the bottom of the supporting plate is controlled between 3cm and 10 cm), setting a lock pin anchor pipe, and installing a longitudinal connecting rib; when the square steel adjusting piece is installed, the square steel adjusting piece is connected with the section steel frame through a bolt, and the side wall of the square steel is closely attached to the baffle; according to the field condition, cushion blocks are arranged between the supporting plate and the square steel, spot welding is adopted between the cushion blocks, the cushion blocks are closely attached and level with the baffle, and the close attachment and tight jacking of the profile steel primary support and the canopy steel pipe are ensured; and (3) mounting the back soil side supporting plate and the baffle plate, wherein the mounting method is as described above, and finally inserting I-shaped steel into the square steel to increase the rigidity of the connecting piece and ensure the transmission of the vertical force of the pipe curtain.
When the primary support is a grid arch, referring to fig. 4a-4b, after the installation of the arc-shaped supporting plate at the soil facing side and the baffle is finished, laying a steel bar net sheet, erecting grid steel frames at two sides, driving a locking anchor pipe and installing longitudinal connecting ribs; the length of the I-steel adjusting piece is adjusted according to the distance between the bottom of the arc-shaped supporting plate and the grid steel frame, the upper end steel plate and the lower end steel plate are welded on the ground, the upper end steel plate is required to be 3-10 cm away from the bottom of the arc-shaped supporting plate, and the I-steel is closely attached to the baffle; filling and tightly jacking the gap between the bottom of the supporting plate and the I-shaped steel adjusting piece by using cushion blocks, and performing spot welding between the cushion blocks; and installing a back soil side supporting plate and a baffle.
Parts of the invention not described in detail are well known in the art. While the foregoing is directed to illustrative embodiments of the present invention, the present invention is not limited in scope by the specific embodiments.
Claims (7)
1. A method for connecting primary support and large-diameter pipe shed construction by a shed cover method is characterized by comprising the following steps: the connecting parts of the method comprise a large pipe shed (1), an arc-shaped supporting plate (2), a baffle (3), a backing plate (4), an adjusting part (5), a primary support steel frame (6), a reinforcing mesh (7), a lock pin anchor pipe (8) and a longitudinal connecting rib (9);
step one, constructing a large-diameter pipe shed (1), and forming a shed cover system by the pipe shed after construction;
step two, excavating a pilot tunnel, constructing an arc-shaped supporting plate (2) on the soil facing side and a baffle (3) when excavating to the arrangement position of a primary support steel frame, laying a reinforcing mesh (7) along the side wall of the pilot tunnel, erecting steel arches (6) on two sides, driving a locking anchor pipe (8) and installing a longitudinal connecting rib (9);
step three, mounting an adjusting piece (5), and filling and jacking a gap between the adjusting piece (5) and the arc-shaped supporting plate (2) by using a cushion block (4);
and step four, installing the back soil side arc-shaped supporting plate (2) and the baffle (3).
2. The method for connecting primary support and large-diameter pipe shed in shed-cover construction according to claim 1, characterized in that: when the pilot tunnel is excavated, the tunnel is excavated along the outline of the large pipe shed, and the residual soil on the bottom surface of the large pipe shed is cleaned.
3. A method for connecting primary supports and large-diameter pipe sheds in canopy construction according to claim 1 or 2, wherein the method comprises the following steps: the size of the arc-shaped supporting plate is manufactured in advance according to the size of the large pipe shed, and the arc-shaped supporting plate is welded with the large pipe shed in a through-length mode after being attached to the large pipe shed in a close mode, so that reliable connection is guaranteed.
4. The method for connecting the primary support and the large-diameter pipe shed in the shed cover construction according to the claim 1, which is characterized in that: the steel arch can be selected from a profile steel arch or a grating arch, and different steel arches correspond to different adjusting pieces; when the steel arch is selected as the grid arch, the adjusting piece is the section steel, and the adjusting piece and the grid arch are connected through the thick steel plate and the bolts; when the steel arch centering is selected to be the section steel arch centering, the adjusting piece is the square steel, the adjusting piece and the section steel arch centering are connected through the bolt and the thick steel plate, the I-shaped steel is inserted into the square steel, the rigidity of the connecting piece is increased, and the vertical force transmission is guaranteed.
5. The method for connecting the primary support and the large-diameter pipe shed in the shed cover construction according to the claim 1, which is characterized in that: when the horizontal axis of big pipe shed deviates for big pipe shed axis and the vertical out of plumb of station, for guaranteeing the effective connection of preliminary bracing and big pipe shed, through the step of adjustment both sides steelframe, ensure that both sides steelframe supports under the pipe curtain.
6. The method for connecting the primary support and the large-diameter pipe shed in the shed cover construction according to the claim 1, which is characterized in that: when the large pipe shed has an upward deviation phenomenon, the length of an adjusting piece between the steel grating on the two sides of the side opening and the pipe curtain and the number of cushion blocks are adjusted according to the actually measured deviation value, so that the steel frame and the large pipe shed are tightly propped and firmly wedged; when the pipe shed is inclined to the side, the steel frames are effectively connected with the upper pipe shed by adjusting the lengths of the steel frames at the two sides and the quantity of the cushion blocks.
7. A method for connecting primary supports and large-diameter pipe sheds in shed-cover construction according to claim 1 or 6, which is characterized in that: the total thickness of the cushion block does not exceed 100mm, and the baffle is closely attached to the adjusting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017467.2A CN111379576B (en) | 2020-01-08 | 2020-01-08 | Method for connecting primary support and large-diameter pipe shed in shed cover construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010017467.2A CN111379576B (en) | 2020-01-08 | 2020-01-08 | Method for connecting primary support and large-diameter pipe shed in shed cover construction |
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| Publication Number | Publication Date |
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| CN111379576A true CN111379576A (en) | 2020-07-07 |
| CN111379576B CN111379576B (en) | 2022-05-03 |
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| CN202010017467.2A Active CN111379576B (en) | 2020-01-08 | 2020-01-08 | Method for connecting primary support and large-diameter pipe shed in shed cover construction |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967504A (en) * | 2014-05-21 | 2014-08-06 | 中国能源建设集团广东省电力设计研究院 | Supporting structure of tunnel opening of power plant circulating water system and construction method |
| CN205778944U (en) * | 2016-05-26 | 2016-12-07 | 中铁十二局集团第三工程有限公司 | A kind of constructing tunnel structure being applicable to expose complex environment arch |
| CN206513372U (en) * | 2017-02-18 | 2017-09-22 | 中铁华铁工程设计集团有限公司 | A kind of drilling and blasting method point pilot drive structure |
| CN109779653A (en) * | 2019-01-22 | 2019-05-21 | 中铁隧道集团二处有限公司 | Soft rock large cross-section tunnel hands over fork construction method |
| CN109958445A (en) * | 2019-04-16 | 2019-07-02 | 北京城建设计发展集团股份有限公司 | The frame construction method in Large Underground space is buried for an ultra shallow |
| CN110005442A (en) * | 2019-04-26 | 2019-07-12 | 中铁二十三局集团第六工程有限公司 | Under wear existing building Urban Underground mining sectbn surrounding rock consolidation technique |
-
2020
- 2020-01-08 CN CN202010017467.2A patent/CN111379576B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967504A (en) * | 2014-05-21 | 2014-08-06 | 中国能源建设集团广东省电力设计研究院 | Supporting structure of tunnel opening of power plant circulating water system and construction method |
| CN205778944U (en) * | 2016-05-26 | 2016-12-07 | 中铁十二局集团第三工程有限公司 | A kind of constructing tunnel structure being applicable to expose complex environment arch |
| CN206513372U (en) * | 2017-02-18 | 2017-09-22 | 中铁华铁工程设计集团有限公司 | A kind of drilling and blasting method point pilot drive structure |
| CN109779653A (en) * | 2019-01-22 | 2019-05-21 | 中铁隧道集团二处有限公司 | Soft rock large cross-section tunnel hands over fork construction method |
| CN109958445A (en) * | 2019-04-16 | 2019-07-02 | 北京城建设计发展集团股份有限公司 | The frame construction method in Large Underground space is buried for an ultra shallow |
| CN110005442A (en) * | 2019-04-26 | 2019-07-12 | 中铁二十三局集团第六工程有限公司 | Under wear existing building Urban Underground mining sectbn surrounding rock consolidation technique |
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| CN111379576B (en) | 2022-05-03 |
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