CN210529712U - Construction structure for foundation pit crossing underground pipeline area - Google Patents
Construction structure for foundation pit crossing underground pipeline area Download PDFInfo
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- CN210529712U CN210529712U CN201920885288.3U CN201920885288U CN210529712U CN 210529712 U CN210529712 U CN 210529712U CN 201920885288 U CN201920885288 U CN 201920885288U CN 210529712 U CN210529712 U CN 210529712U
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Abstract
The utility model provides a foundation ditch spanes regional construction structure of pipeline. The construction structure comprises a foundation pit support structure, a pipeline protection structure and an MJS construction method pile reinforcing body located outside the foundation pit in the underground pipeline crossing area, wherein the MJS construction method pile reinforcing body consists of a plurality of rows of inclined MJS construction method piles and grouting steel pipes inserted into drilled holes in each pile body, and the pile bodies are distributed on two sides of the pipeline and are inclined towards the lower part of the underground pipeline without overlapping; the pipeline protection structure comprises lattice column supports positioned on two sides of an underground pipeline in a foundation pit, a beam erected at the top of the lattice column supports and a plurality of pipeline suspension members, and the foundation pit support structure comprises a cast-in-place lining wall which is positioned outside a transverse cross region of the underground pipeline and adopts a cast-in-place pile support structure and is positioned in the transverse cross region of the underground pipeline. The utility model discloses not only guaranteed the normal excavation of foundation ditch, still reduced the risk of pipeline destruction effectively, prevent that the pipeline from taking place big displacement receiving horizontal load to the time limit for a project of foundation ditch excavation has been shortened.
Description
Technical Field
The utility model discloses to subway station open cut construction field, specifically be a foundation ditch spanes regional construction structures of underground pipeline.
Background
With the continuous development of national economy and urban traffic construction in China, the climax of underground rail traffic construction is raised in China, more pipeline interference is inevitably generated in the subway station construction process, particularly, the pipelines are difficult to move and change, the excavation of a subway station foundation pit is ensured, a filling pile enclosure structure forms a closed whole, but the construction of the enclosure structure at the lower part of the pipeline has greater risk.
In most southern cities, reverse continuous wall construction is often adopted to solve similar problems. However, in northern cities, most subway station building enclosures adopt a support system formed by cast-in-place piles and supports, reverse continuous wall construction is adopted to solve similar problems, the difficulty is high, the construction cost is high, and great risks exist in the excavation process, so that the research on a structure for completing sealing and excavation of a foundation pit spanned by an underground pipeline is very necessary for ensuring stable excavation of the foundation pit and reducing the construction risks.
SUMMERY OF THE UTILITY MODEL
A foundation ditch spanes regional construction structures of underground pipeline, this construction structures include bored concrete pile envelope and pipeline protection architecture, are applicable to the subway station that envelope adds the support system for the bored concrete pile, can guarantee the safety of pipeline and the stability of foundation ditch excavation.
In order to solve the technical problem, the utility model provides a technical scheme does: the utility model provides a foundation ditch strides regional construction structures of underground pipeline, including the foundation ditch, stride the underground pipeline of foundation ditch and the outer bored concrete pile envelope of underground pipeline span area, its characterized in that: the construction structure also comprises a pipeline protection structure, an outer foundation pit reinforcing structure and an enclosing structure enclosing wall of an underground pipeline crossing region, wherein the outer foundation pit reinforcing structure comprises MJS construction method pile reinforcing bodies which are positioned outside the foundation pit in the underground pipeline crossing region and are constructed in the range close to a cast-in-place pile enclosing structure, the MJS construction method pile reinforcing bodies constructed on the same side of the foundation pit comprise two MJS construction method pile reinforcing bodies which are respectively arranged on two sides of the underground pipeline, each MJS construction method pile reinforcing body on each side consists of multiple rows of inclined MJS construction method piles and a cast-in steel pipe inserted into a drilled hole in each pile body, the multiple rows of MJS construction method piles on two sides of the underground pipeline are inclined towards the lower part of the underground pipeline and intersect with the lower part of the underground pipeline, the cast-in steel pipes arranged in each pile body have the same inclination angle with the pile bodies, and the cast-in steel pipes are filled by; the pipeline protection structure comprises lattice column supports positioned at two sides of an underground pipeline in a foundation pit, a cross beam erected at the tops of the lattice column supports and a plurality of pipeline suspension members arranged on the cross beam, wherein each pipeline suspension member is connected with the underground pipeline and suspends the underground pipeline; the enclosure structure closed wall located in the cross area of the underground pipeline is a cast-in-place lining wall formed by binding reinforcement cage cast-in-place concrete.
The utility model discloses better technical scheme: the MJS construction method pile reinforcing bodies arranged on two sides of the underground pipeline on the same side of the foundation pit respectively comprise 5-8 rows of parallel MJS construction method piles, the innermost row of MJS construction method piles is adjacent to a surrounding structure of the foundation pit, and the inclination angle of each MJS construction method pile is 12-20 degrees; and the MJS construction method piles on the two sides of the underground pipeline are not overlapped and intersected below the underground pipeline.
The utility model discloses better technical scheme: the lattice column supports are distributed on two sides of the underground pipeline in a staggered mode, an I-shaped steel beam is erected at the tops of two adjacent lattice column supports on different sides, and a pipeline suspension member is arranged at the position, corresponding to the underground pipeline, of each beam.
The utility model discloses better technical scheme: the thickness of the enclosure structure enclosure wall is the same as that of a cast-in-place pile enclosure structure, the depth is the same as that of a foundation pit, a double-layer reinforcing steel bar net with the diameter of 10-12mm is arranged in the enclosure structure enclosure wall, two ends of reinforcing steel bars are connected with a cast-in-place pile of the cast-in-place pile enclosure structure, a formwork is erected, C30 concrete is cast in sections, and the casting height is 5-8m each time.
The utility model discloses better technical scheme: the pipeline suspension component comprises a turn buckle, a steel wire suspension ring and a rubber cushion layer, wherein the upper end of the turn buckle is fixed on the cross beam, the lower end of the turn buckle is connected with the steel wire suspension ring, the steel wire suspension ring surrounds the underground pipeline, and the rubber cushion layer is arranged in the contact area of the steel wire suspension ring and the underground pipeline.
The utility model discloses better technical scheme: the MJS construction method piles are constructed by cement with the model number of P.O 42.5.5, the vertical distance from the bottom of a pile body to a base is 1.5-2 m, the pile diameter is 800mm, and the distance between the pile bodies is 450 mm.
The utility model discloses better technical scheme: and grouting holes which are spirally distributed are arranged on the side wall of the grouting steel pipe, cement paste is injected into the grouting steel pipe for filling, and the grouting pressure is 0.5-1 MPa.
The utility model discloses better technical scheme: the jet flow initial pressure of the MJS construction method pile is 40MPa, the flow is controlled to be 90-130 l/min, single-nozzle jetting is adopted, the jetting time per meter is 30-40 min, and the average lifting speed is controlled to be 2.5-3.3 cm/min.
The technical effects of the utility model:
(1) the utility model discloses after all the other position envelope bored concrete piles of foundation ditch are accomplished, at first at the underground pipeline through the outer regional multirow MJS worker method stake of constructing of foundation ditch of scope both sides, the pile body distributes in the pipeline both sides, and the skew is under the underground pipeline, as the not regional supporting construction of bored concrete pile envelope, can guarantee the stability of foundation ditch excavation, has avoided the bored concrete pile of being under construction in the pipeline lower part again, damages the risk of pipeline. Meanwhile, the soil body below the pipeline is reinforced, and the problem that the safety of the pipeline is influenced because the ground surface outside the foundation pit is settled due to excavation of the foundation pit is prevented.
(2) The utility model discloses drill in the MJS worker method stake, then bury the steel floral tube, the slip casting hole that is spiral distribution is arranged to the steel floral tube lateral wall, only one slip casting hole on the same cross-section of assurance perpendicular to steel floral tube axis, then to the inside grout that pours into of steel floral tube, fill steel floral tube and space. The steel floral tube plays the effect that adds the muscle to reinforced soil body, increases the bending resistance of the soil body, further consolidates the soil body, guarantees the stability of foundation ditch excavation.
(3) The utility model discloses at pipeline both sides cross arrangement lattice column support system, then carry out the flexible coupling with the pipeline with turnbuckle, wire rope and suspend the protection in midair, can prevent to appear great deformation in the foundation ditch excavation in-process, this kind of safeguard measure is with low costs simultaneously, and the construction is simple, and is less to follow-up subway station construction influence, has shortened construction period effectively, has guaranteed the normal excavation of foundation ditch.
(4) The utility model discloses at the foundation ditch excavation in-process, in closed fender pile department not, the cast-in-place interior wall of segmentation construction connects into a confined whole with bored concrete pile retaining structure, has strengthened bored concrete pile retaining structure's atress transmission, has reduced the risk of foundation ditch excavation in-process effectively. Meanwhile, the lining wall provides a rigid pivot for the pipeline, so that the pipeline is prevented from generating large displacement when receiving transverse load, and the pipeline is further protected.
Drawings
Fig. 1 is a schematic plan view of the present invention;
fig. 2 is a schematic view of a pipeline suspension joint of the present invention;
FIG. 3 is a cross-sectional view AA in FIG. 1;
fig. 4 is a cross-sectional view BB of fig. 1.
In the figure: the construction method comprises the following steps of 1-foundation pit, 2-underground pipeline, 3-cast-in-place pile enclosure, 4-MJS construction pile reinforcement, 5-cast-in-place steel pipe, 6-lattice column support, 7-cross beam, 8-pipeline suspension member, 8-1-turn-flower bolt, 8-2-steel wire hanging ring, 8-3-rubber cushion layer, 9-MJS construction pile and 10-enclosure enclosing wall.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments, wherein fig. 1 to 4 are drawings of the embodiments, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the embodiments of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
An embodiment provides a foundation ditch strides construction structures in underground pipeline region, as shown in fig. 1 and fig. 3, including foundation ditch 1, the underground pipeline 2 that strides across the foundation ditch and the bored concrete pile envelope 3 outside underground pipeline 2 strides the region, its characterized in that: the construction structure further comprises a pipeline protection structure, an outer foundation pit reinforcing structure and an enclosing structure enclosing wall 10 of the area spanned by the underground pipeline 2, wherein the outer foundation pit reinforcing structure comprises MJS construction method pile reinforcing bodies 4 which are constructed in the area spanned by the underground pipeline 2, are positioned outside the foundation pit 1 and close to the cast-in-place pile enclosing structure 3, and the two MJS construction method pile reinforcing bodies 4 which are constructed on the same side of the foundation pit 1 comprise two MJS construction method pile reinforcing bodies and are respectively arranged on two sides of the underground pipeline 2. The MJS construction method pile reinforcing bodies 4 on each side are all six rows of inclined MJS construction method piles 9, the innermost row of MJS construction method piles is adjacent to a building protection structure of the foundation pit 1, and the multiple rows of MJS construction method piles 9 on two sides of the underground pipeline 2 are inclined by 12-20 degrees towards the lower portion of the underground pipeline 2. Each MJS-method pile 9 is constructed by cement with the model number of P.O 42.5.5, the vertical distance from the bottom of a pile body to a substrate is 1.5-2 m, the pile diameter is 800mm, and the distance between pile bodies is 450 mm. The initial pressure of a jet flow of each MJS construction method pile 9 is 40MPa, the flow is controlled to be 90-130 l/min, a single nozzle is used for jetting, the jetting time per meter is 30-40 min, and the average lifting speed is controlled to be 2.5-3.3 cm/min. As shown in fig. 3, the plurality of MJS-construction-method piles 9 on each side have the same inclination angle, and the MJS-construction-method piles 9 on both sides of the underground pipeline 2 do not overlap and intersect below the underground pipeline 2. As shown in fig. 3 and 4, a grouting steel pipe 5 is drilled and inserted into each pile body, grouting holes are spirally distributed in the pipe side wall of the grouting steel pipe 5, only one grouting hole is formed in the same section perpendicular to the axis of the steel perforated pipe, then cement slurry is injected into the grouting steel pipe 5 for filling, and the grouting pressure is 0.5-1 MPa.
In the embodiment of the construction structure of the foundation pit crossing the underground pipeline region, as shown in fig. 1 and 3, the pipeline protection structure comprises lattice column supports 6 arranged at two sides of the underground pipeline 2 in the foundation pit, i-steel beams 7 erected at the tops of the lattice column supports 6, and a plurality of pipeline suspension members 8 arranged on the beams 7, wherein the lattice column supports 6 are distributed at two sides of the underground pipeline 2 in a staggered manner, one i-steel beam is erected at the tops of two adjacent lattice column supports 6 at different sides, and a pipeline suspension member 8 is arranged at a position of each beam 7 corresponding to the underground pipeline 2. As shown in fig. 2, the pipeline suspension member 8 comprises a turn buckle 8-1 and a wire eye 8-2, the turn buckle 8-1 is fixed on the cross beam 7 at the upper end and connected with the wire eye 8-2 at the lower end, the wire eye 8-2 surrounds and suspends the underground pipeline 2, and a rubber cushion layer 8-3 is arranged at the contact area of the wire eye 8-2 and the underground pipeline 2.
In the construction structure of the foundation pit crossing the underground pipeline region in the embodiment, as shown in fig. 1 and 3, the enclosure structure enclosure wall 10 located in the crossing region of the underground pipeline 2 is a cast-in-place lining wall formed by binding reinforcement cage cast-in-place concrete. The thickness of the enclosure structure enclosure wall 10 is the same as that of the cast-in-place pile enclosure structure 3, the depth is consistent with the excavation depth of the foundation pit, a double-layer reinforcing mesh with the diameter of 10-12mm is arranged in the enclosure structure enclosure wall 10, two ends of reinforcing steel bars are connected with the cast-in-place pile of the cast-in-place pile enclosure structure 3, a template is erected, C30 concrete is cast in sections, and the casting height is 5-8m each time.
It is right to combine specific example below the utility model discloses a construction process further explains, and this construction example is to the construction of certain project foundation ditch, and this foundation ditch is because the pipeline spanes the foundation ditch, and the pipeline passes through the unable construction of enclosure structure bored concrete pile in the within range, for guaranteeing the normal excavation of foundation ditch, adopts the utility model discloses a construction structure passes the region to the pipeline and is under construction, and its work progress is as follows:
(1) after the filling piles of the enclosure structures at the rest parts of the foundation pit are finished, accurately finding the position of the underground pipeline, then constructing the reinforcement body of the MJS construction method piles, respectively constructing 6 rows of MJS construction method piles 9 in the areas outside the foundation pit at two sides of the passing range of the underground pipeline 2, distributing the piles at two sides of the pipeline, obliquely crossing the lower part of the underground pipeline 2, and ensuring the inclination angle to be 12-20 ℃; the MJS construction method pile 9 is made of P.O 42.5.5 type cement, the vertical distance from the bottom of a pile body to a substrate is not 1.5-2 m, the pile diameter is 800mm, the distance between the pile bodies is 450mm, when the MJS construction method pile is constructed, the initial pressure of a jet flow is required to be 40MPa, the flow is controlled to be 90-130 l/min, single-nozzle injection is used, the injection time per meter is 30-40 min, and the average lifting speed is required to be 2.5-3.3 cm/min. The foundation pit outer side soil body of the unclosed position of the fender pile is reinforced, the stability of the foundation pit in the excavation process is guaranteed, meanwhile, the soil body below the pipeline is reinforced, and the problem that the safety of the pipeline is affected due to the fact that the outer surface of the foundation pit is settled due to excavation of the foundation pit is avoided.
(2) After the MJS construction method pile is constructed, a hole is drilled along the MJS construction method pile, the angle of the hole is consistent with the angle of a pile body, a grouting steel pipe 5 with grouting holes in the side wall is buried, the outer diameter of the grouting steel pipe 5 is 89mm, the grouting holes which are spirally distributed are arranged in the side wall of the pipe, only one grouting hole is ensured on the same section vertical to the axis of the steel perforated pipe, then grouting is carried out in the grouting steel pipe 5, the drilled hole and the grouting steel pipe 5 are filled, and grout is formed by using P.O 42.5.5 cement according to the proportion of 1: 1, and the grouting pressure is 0.5-1 MPa. The grouting steel pipe 5 has a reinforcement effect on the reinforced soil body, the bending resistance of the reinforced soil body is increased, the soil body is further reinforced, and the risk caused by the fact that the soil pressure is too large for excavation of the foundation pit is prevented.
(3) Lattice column supports 6 are alternately constructed on two sides of the pipeline, cast-in-place piles with the diameter of 1.2m are used as lattice column foundations, the lattice columns are welded by adopting L180 multiplied by 18mm angle steel and 14mm thick steel plates, I-shaped steel with the model number of I45a is erected at the tops of the lattice columns to be used as a cross beam 7, and then the underground pipeline 2 is subjected to soft connection suspension protection by using a turnbuckle 8-1 and a steel wire suspension ring 8-2; in order to prevent the steel wire rope from damaging the pipeline, a rubber cushion layer 8-3 is required to be added at the lower part of the pipeline, and then the pipeline is suspended by the steel wire rope, so that the contact area of the steel wire rope is increased, and the pipeline is prevented from being damaged in the suspension process.
(4) After excavating a certain depth, binding small-size steel bars at unclosed fender piles, erecting a template, casting concrete in situ to construct a fender structure closed wall 10 of a cross region of an underground pipeline 2, casting in sections in the excavating process, wherein the casting height is 5-8m each time, arranging a double-layer steel bar net with the diameter of 10-12mm in the lining, connecting two ends of the steel bars with cast-in-place piles together, and casting C30 concrete. When the first section of concrete lining is poured, the outer side of the pipeline is coated with a preservative, and is wrapped with a rubber cushion layer, and then pouring is carried out. And reserving a hole with the diameter of 100mm at the upper part of each pouring construction joint as a feed opening for the next concrete pouring. And in the pouring process, the concrete is guaranteed to be vibrated compactly, the treatment of the construction joint is strictly carried out according to the standard, and the integrity of the lining is guaranteed. The inner lining wall provides a rigid pivot for the pipeline, so that the pipeline is prevented from large displacement when being subjected to transverse load, and the pipeline is further protected.
The utility model discloses an interior MJS worker method stake of establishing slip casting steel pipe is accomplished and is consolidated the outside soil body of the not closed area of bored concrete pile envelope, can guarantee the stability of foundation ditch excavation, has avoided the bored concrete pile of being under construction in pipeline lower part again, damages the risk of pipeline, simultaneously, consolidates the pipeline below soil body, prevents because foundation ditch excavation makes the foundation ditch outer surface take place to subside, influences the safety of pipeline. Carry out the flexible coupling through pipeline protection structure to the underground line and suspend the protection in midair, can prevent to appear great deformation in the foundation ditch excavation process, it is less to follow-up subway station construction influence, shortened construction period effectively, guaranteed the normal excavation of foundation ditch. In the excavation process, in order to ensure that the filling pile enclosure structures are connected into a whole on the longitudinal axis, after a certain depth is excavated, a cast-in-place lining wall is constructed, so that the stress transmission of the filling pile enclosure structures is enhanced, and the risk in the excavation process of the foundation pit is effectively reduced. Meanwhile, the lining wall provides a rigid pivot for the pipeline, so that the pipeline is prevented from generating large displacement when receiving transverse load, and the pipeline is further protected.
It will be apparent to those skilled in the art that various changes may be made in the above embodiments without departing from the scope of the invention, and all changes, equivalents and modifications that may be made in the embodiments of the invention are intended to be included within the scope of the appended claims.
Claims (8)
1. The utility model provides a foundation ditch strides regional construction structures of underground pipeline, includes foundation ditch (1), strides underground pipeline (2) and underground pipeline (2) of foundation ditch and strides outside bored concrete pile envelope (3) of region, its characterized in that: the construction structure further comprises a pipeline protection structure, a foundation pit external reinforcing structure and a retaining structure closed wall (10) of the crossing region of the underground pipeline (2), the foundation pit external reinforcing structure comprises MJS construction method pile reinforcing bodies (4) which are constructed in the range that the crossing region of the underground pipeline (2) is positioned outside the foundation pit (1) and close to a cast-in-place pile retaining structure (3), the MJS construction method pile reinforcing bodies (4) which are constructed at the same side of the foundation pit (1) comprise two MJS construction method pile reinforcing bodies (4) which are respectively arranged at two sides of the underground pipeline (2), each MJS construction method pile reinforcing body (4) consists of a plurality of rows of inclined MJS construction method piles (9) and a cast-in steel pipe (5) which is drilled and inserted into each pile body, the plurality of rows of MJS construction method piles (9) which are positioned at two sides of the underground pipeline (2) are inclined towards the lower part of the underground pipeline (2) and are intersected at the lower part of the underground pipeline (2), the steel pipes (5), after the grouting steel pipe (5) is inserted, the grouting steel pipe is filled by grouting into the pipe; the pipeline protection structure comprises lattice column supports (6) positioned at two sides of an underground pipeline (2) in a foundation pit, a cross beam (7) erected at the tops of the lattice column supports (6) and a plurality of pipeline suspension members (8) arranged on the cross beam (7), wherein each pipeline suspension member (8) is connected with and suspends the underground pipeline (2); the enclosure structure closed wall (10) located in the cross area of the underground pipeline (2) is a cast-in-place lining wall formed by binding reinforcement cage cast-in-place concrete.
2. The structure of claim 1, wherein: the MJS construction method pile reinforcing bodies (4) arranged on two sides of the underground pipeline (2) on the same side of the foundation pit respectively comprise 5-8 rows of parallel MJS construction method piles (9), the innermost row of MJS construction method piles is adjacent to a surrounding structure of the foundation pit (1), and the inclination angle of each MJS construction method pile (9) is 12-20 degrees; and the MJS construction method piles (9) on the two sides of the underground pipeline (2) are not overlapped and intersected below the underground pipeline (2).
3. The structure of claim 1, wherein: the lattice column supports (6) are distributed on two sides of the underground pipeline (2) in a staggered mode, an I-shaped steel beam is erected at the tops of two adjacent lattice column supports (6) on different sides, and a pipeline suspension member (8) is arranged at the position, corresponding to the underground pipeline (2), of each beam (7).
4. The structure of claim 1, wherein: the thickness of the enclosure structure enclosure wall (10) is the same as that of the cast-in-place pile enclosure structure (3), the depth is the same as that of the foundation pit excavation, a double-layer reinforcing mesh with the diameter of 10-12mm is arranged in the enclosure structure enclosure wall (10), two ends of the reinforcing mesh are connected with the cast-in-place pile of the cast-in-place pile enclosure structure (3), a formwork is erected for pouring C30 concrete in a segmented mode, and the pouring height is 5-8m each time.
5. A construction structure of a foundation pit crossing over an underground utility area according to claim 1 or 3, wherein: the pipeline suspension component (8) comprises a basket bolt (8-1) and a steel wire hanging ring (8-2), the upper end of the basket bolt (8-1) is fixed on the cross beam (7), the lower end of the basket bolt is connected with the steel wire hanging ring (8-2), the steel wire hanging ring (8-2) surrounds the underground pipeline (2), and a rubber buffer cushion layer (8-3) is arranged in a contact area of the steel wire hanging ring (8-2) and the underground pipeline (2).
6. The underground pipeline crossing foundation pit closing and excavating structure according to claim 1 or 2, wherein: the MJS construction method piles (9) are constructed by cement with the model number of P.O 42.5.5, the vertical distance from the bottom of a pile body to a base is 1.5-2 m, the pile diameter is 800mm, and the distance between the pile bodies is 450 mm.
7. The underground pipeline crossing foundation pit closing and excavating structure according to claim 1 or 2, wherein: and grouting holes which are spirally distributed are arranged on the side wall of the grouting steel pipe (5), cement paste is injected into the grouting steel pipe (5) for filling, and the grouting pressure is 0.5-1 MPa.
8. The underground pipeline crossing foundation pit closing and excavating structure according to claim 1 or 2, wherein: the jet flow initial pressure of the MJS construction method pile (9) is 40MPa, the flow is controlled to be 90-130 l/min, single-nozzle jetting is adopted, the jetting time per meter is 30-40 min, and the average lifting speed is controlled to be 2.5-3.3 cm/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648373A (en) * | 2020-05-15 | 2020-09-11 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
| CN111851578A (en) * | 2020-07-15 | 2020-10-30 | 中铁第一勘察设计院集团有限公司 | Local top plate reverse building structure of subway station for moving and changing gravity flow pipe culvert and construction method |
| CN112359838A (en) * | 2020-11-13 | 2021-02-12 | 威海市市政工程有限公司 | Safe and environment-friendly construction method for protecting large-span suspended pipeline in foundation pit |
-
2019
- 2019-06-12 CN CN201920885288.3U patent/CN210529712U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648373A (en) * | 2020-05-15 | 2020-09-11 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
| CN111648373B (en) * | 2020-05-15 | 2021-11-09 | 中铁六局集团有限公司 | Excavation supporting construction process for water-rich deep foundation pit fender pile gap |
| CN111851578A (en) * | 2020-07-15 | 2020-10-30 | 中铁第一勘察设计院集团有限公司 | Local top plate reverse building structure of subway station for moving and changing gravity flow pipe culvert and construction method |
| CN111851578B (en) * | 2020-07-15 | 2021-12-07 | 中铁第一勘察设计院集团有限公司 | Construction method for local roof inverse building structure of subway station for moving and changing gravity flow pipe culvert |
| CN112359838A (en) * | 2020-11-13 | 2021-02-12 | 威海市市政工程有限公司 | Safe and environment-friendly construction method for protecting large-span suspended pipeline in foundation pit |
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| GR01 | Patent grant |