CN219298221U - Station foundation pit construction structure - Google Patents

Abstract

The application discloses station foundation ditch construction structure, station foundation ditch construction structure includes: existing pipelines, fender piles, pile plate walls, crown beams and pipeline supports. And the fender post forms a vacant part corresponding to the area of the existing pipeline. The stake sheet wall connect in the fender post, just stake sheet wall shutoff vacancy portion. The crown beam is supported on the fender post and the pile plate wall, and the crown beam connects and fixes the fender post and the plate wall. The pipeline support body both ends are supported respectively in the position that the crown beam corresponds the vacancy portion, set up a plurality of rings on the pipeline support body, and each rings is along the length direction interval setting in proper order of pipeline support body, and each rings supports existing pipeline. The station foundation pit construction structure can well solve the problems that a pipeline is difficult to move and change in the process, the moving and changing risk is large and the like, the construction period and the cost are also controllable, and the moving and construction risk and difficulty of the pipeline in the early stage of subway construction are reduced.

Description

Station foundation pit construction structure

Technical Field

The utility model relates to the technical field of building construction, in particular to a station foundation pit construction structure.

Background

Along with the continuous acceleration of the urban process of the whole country, subway construction also enters a fast traffic lane, and a route is planned in an old urban area and a station is set up when the subway is built. The construction of the old urban area often faces the problems of complicated pipelines, narrow surrounding sites, poor underground soil quality and the like, and the construction of the subway station mostly adopts open excavation foundation pit construction, so that the problems often have serious influence on the subway construction.

In the prior art, the pipeline which influences the construction of the station foundation pit is changed to the foundation pit range, the pipeline is rearranged at the periphery of the foundation pit, the original pipeline is abandoned, then the building enclosure is constructed, and the foundation pit excavation construction is carried out after the building enclosure is closed. And after finishing the construction of the main structure in the later period, the migrated pipeline is migrated back to the original pipeline position. The technology makes the overall construction progress limited by the transition of the pipeline in the earlier stage, has great influence on the overall construction period, and relates to the transition of the pipeline for multiple times, so that the construction cost is high. Therefore, on the premise of ensuring the safety of the foundation pit, it is important to search for a new pipeline processing method.

In view of this, the present utility model has been made.

Disclosure of Invention

The utility model provides a station foundation pit construction structure.

The utility model adopts the following technical scheme:

a station foundation pit construction structure, comprising:

existing pipelines;

a fender post, wherein a vacant part is formed in the fender post corresponding to the area of the existing pipeline;

the pile plate wall is connected to the guard piles and seals the gap;

the crown beam is supported on the fender post and the pile plate wall and is used for fixedly connecting the fender post and the plate wall;

the pipeline supporting body, the pipeline supporting body both ends support respectively in the crown beam corresponds the position of vacancy portion, set up a plurality of rings on the pipeline supporting body, each rings is followed the length direction of pipeline supporting body sets gradually the interval, and each rings supports existing pipeline.

Optionally, a plurality of gaskets are arranged on the pipeline support body;

the two ends of the hanging ring are respectively connected to the corresponding gaskets;

the hanging ring and the gasket form a closed ring.

Optionally, the gasket extends in a direction perpendicular to the length of the pipeline support;

two connecting holes are formed in the gasket;

and two ends of the hanging ring are respectively connected with the two connecting holes.

Optionally, the hanging ring comprises two screws and bent flat steel;

the connecting hole is provided with an internal thread;

the screws are respectively connected with the corresponding connecting holes in a threaded mode, and two ends of the flat steel are respectively connected with the two screws.

Optionally, the screw rod and the flat steel are welded and fixed.

Optionally, the pipeline support body comprises three i-beams, the i-beams are parallel and are arranged at intervals, and two gaps are formed between the i-beams;

the gaskets are respectively welded and fixed with the I-steel;

the two threaded holes are opposite to the two gaps.

Optionally, the pile plate wall is provided with a steel grid, a net sheet and a concrete layer;

the steel grating is connected to the fender post;

the net piece set up in the both sides of steel grating, concrete layer connect in steel grating and net piece.

Optionally, the pile bodies of the guard piles on two sides of the vacancy are provided with connecting parts;

the steel grating is fixed on the connecting part.

Optionally, the connecting portion includes a plurality of steel plates, and each steel plate is sequentially arranged along the length direction of the corresponding pile body;

the steel grating comprises a plurality of connecting beams, the connecting beams are sequentially arranged at intervals along the length direction of the pile body, and two ends of each connecting beam are respectively welded on two steel plates which are opposite in position on two pile bodies on two sides of the vacant part.

Optionally, the steel plates are fixed on the corresponding pile bodies through expansion bolts, or the steel plates are welded on a plurality of steel bars, and each steel bar is anchored in the pile bodies.

By adopting the technical scheme, the utility model has the following beneficial effects:

the station foundation pit construction structure can well solve the problems that a pipeline is difficult to move and change in the process, the moving and changing risk is large and the like, the construction period and the cost are also controllable, and the moving and construction risk and difficulty of the pipeline in the early stage of subway construction are reduced.

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model, without limitation to the utility model. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

fig. 1 is a top view of a station foundation pit construction structure provided in an embodiment of the present application;

fig. 2 is a schematic cross-sectional view of a station foundation pit construction structure provided in an embodiment of the present application;

fig. 3 is a partial structure elevation view of a station foundation pit construction structure provided in an embodiment of the present application;

fig. 4 is a cross-sectional view of a station foundation pit construction structure provided in an embodiment of the present application at a pile plate wall portion;

fig. 5 is a schematic structural diagram of a grouting pipe in a station foundation pit construction structure according to an embodiment of the present application;

fig. 6 is a schematic top view of a pipeline support in a station foundation pit construction structure according to an embodiment of the present application;

fig. 7 is a cross-sectional view of a pipeline support body of a station pit construction structure provided in an embodiment of the present application.

In the figure, 1, a fender post; 2. a pipeline; 3. pile plate wall; 31. a steel grating; 32. a mesh sheet; 33. grouting guide pipe; 331. sharp corner; 332. a pulp outlet hole; 4. a crown beam; 5. a pipeline support; 51. i-steel; 52. a gasket; 521. a connection hole; 6. a retaining wall; 7. a hollow portion; 8. a hanging ring; 81. flat steel; 82. and (3) a screw.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or component 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 utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1 to 7, a first embodiment of the present application provides a station foundation pit construction structure, including: existing pipelines 2, fender piles 1, pile plate walls 3, crown beams 4 and pipeline supporting bodies 5. The fender post 1 corresponds the region of existing pipeline 2 forms vacancy 7, stake sheet wall 3 connect in fender post 1, just stake sheet wall 3 shutoff vacancy 7, the roof beam 4 support in on fender post 1 and the stake sheet wall 3, the roof beam will the fender post is connected fixedly with the plate wall, pipeline supporter 5 both ends support respectively in the roof beam 4 corresponds the position of vacancy 7, pipeline supporter 5 suspends in midair existing pipeline 2. The pipeline support body is provided with a plurality of hanging rings 8, each hanging ring 8 is sequentially arranged at intervals along the length direction of the pipeline support body, and each hanging ring 8 supports the existing pipeline.

The lifting ring 8 is U-shaped, a plurality of gaskets 52 are arranged on the pipeline support body, two ends of the lifting ring 8 are respectively connected to the corresponding gaskets 52, and the lifting ring 8 and the gaskets 52 form a closed loop to prevent the existing pipeline from falling off.

The gasket 52 extends along a length direction perpendicular to the pipeline support body, two connecting holes 521 are formed in the gasket 52, and two ends of the hanging ring 8 are respectively connected to the two connecting holes 521.

The hanging ring 8 comprises two screw rods 82 and a bent flat steel 81, and the connecting hole 521 is provided with internal threads;

the screws 82 are respectively screwed to the corresponding connecting holes 521, and both ends of the flat steel 81 are respectively connected to the two screws 82.

Wherein the screw 82 and the flat steel 81 are welded and fixed. Two screws 82 are first screwed into the corresponding connection holes 521, and then both ends of the flat steel 81 are welded to the two screws 82, respectively.

The pipeline support body comprises three I-steel 51, the I-steel 51 are arranged in parallel and at intervals, two gaps are formed between the I-steel 51, the gasket 52 is welded and fixed with the I-steel 51 respectively, and the two threaded holes are opposite to the two gaps. The gasket 52 is welded with the three I-beams 51, and the three I-beams 51 are welded into a whole. The gaskets 52 are positioned at the top of each I-steel 51, the screw 82 can smoothly extend to the connecting hole 521 on the gaskets 52 through the gap, the screw 82 can be screwed on the connecting hole 521 by rotating the screw 82, and then the flat steel 81 supports the pipeline and is welded and fixed with the two screws 82 respectively.

In the prior art, the problems of insufficient space position, difficult transition and modification process, large transition and modification risk and the like possibly exist in the transition and modification of the pipeline 2 in the early stage, so that the foundation pit support structure cannot be closed, and safety risk is brought to the foundation pit excavation process. And the construction period and cost of the movable modification are also uncontrollable, and great construction period and cost risk are easily caused to subway construction. The utility model provides a fender post 1 has dodged pipeline 2 and has been set up to non-enclosed structure, forms two and dodges pipeline 2's vacancy portion 7, and these vacancy portion 7 later stage has sealed through construction stake siding wall, and the station foundation ditch construction structure of this application can be fine and has solved pipeline 2 and move and change the process difficulty, moves the great scheduling problem of changing the risk, and construction period and cost are also controllable, reduces subway construction earlier stage pipe and moves construction risk and degree of difficulty.

The pipeline support body 5 can also adopt army Liang Duiguan line 2 to carry out in-situ suspension protection. After the pipeline 2 is suspended for protection, an excavation process can be performed.

In one possible embodiment, as shown in fig. 2 to 4, the pile sheet wall 3 has a steel grid 31, a mesh sheet 32, and concrete layers, the steel grid 31 being attached to the fender pile 1, the mesh sheet 32 being disposed on both sides of the steel grid 31 in the thickness direction, and the concrete layers being attached to the steel grid 31 and the mesh sheet 32. The steel grid 31 and mesh 32 provide concrete layer attachment points. The concrete layer can be formed by spraying concrete. The C25 early strength concrete can be sprayed on the outer layer net sheet 32 of the steel grating 31, the thickness is approximately 0.3-0.5 m, and the thickness is larger, so that the structural strength of the pile plate wall 3 is improved.

In a possible embodiment, the pile bodies of the fender post 1 on both sides of the hollow portion 7 are provided with connection portions (not shown) to which the steel grating 31 is fixed.

In this embodiment, both sides of the steel grating 31 are respectively fixed to the connection parts on the pile bodies on both sides, and after the C25 early-strength concrete is sprayed to form a concrete layer, the formed pile plate wall 3 and pile bodies are connected to form an integral structure, so that the structural strength is good.

In one possible embodiment, the connection portion includes a plurality of steel plates, each of which is sequentially disposed along a length direction of a corresponding pile body, the steel grid 31 includes a plurality of connection beams, each of which is sequentially disposed at intervals along the length direction of the pile body, and two ends of each of which are respectively welded to two opposite steel plates on two pile bodies at two sides of the hollow portion 7.

In this embodiment, the longitudinal spacing of the connection beams may be 0.3-0.65m. The steel plates can be fixed on the corresponding pile bodies through expansion bolts; or, a hole can be drilled on the pile body to expose the reinforcing steel bars inside, then a steel plate is welded on the reinforcing steel bars in the pile body, and a connecting beam is welded on the steel plate, so that the pile plate wall 3 and the pile body form an integrated structure; or the steel plates are welded on the steel bars, each steel bar is anchored in the pile body, and each steel bar can be conveniently installed in the hole groove by punching holes in the pile body.

In one possible embodiment, the station pit construction structure further includes a plurality of grouting ducts 33, and one end of each grouting duct 33 extends into the soil body at the rear of the steel grating 31. The grouting conduit 33 can be used for injecting slurry into soil, the slurry can be cement mortar, and the grouting pressure can be set according to specific working conditions. The steel grating 31 is enabled to deviate from a side cement thickening layer of the concrete layer through grouting, the effect of further improving the structural strength of the pile plate wall 3 is achieved, and the structural strength of the blank part 7 of the fender pile 1 reaches the standard. The grouting guide pipes 33 can be constructed before the concrete spraying process, the pipe orifices of the grouting guide pipes 33 are covered by a cover body, then concrete is sprayed, when the strength of a concrete layer formed by the sprayed concrete reaches the standard, the cover body is disassembled again, grouting is performed to the inner side of the steel grating 31 through the grouting guide pipes 33, after grouting is completed, the grouting guide pipes 33 are not disassembled, the grouting guide pipes 33 can be of a metal structure, cement is filled in the grouting guide pipes 33, plugging is not needed any more, the grouting guide pipes 33 are not required to be disassembled, the construction process is simplified, and the grouting guide pipes 33 form a keel structure in the pile plate wall 3, so that the effect of reinforcing the structural strength of the plate loading cavity is achieved.

In one possible embodiment, one end of the grouting conduit 33 is provided with a sharp corner 331, and the grouting conduit 33 is provided with a plurality of grout outlets 332. The setting of closed angle portion 331 makes things convenient for slip casting pipe 33 to insert in the soil body, and sets up a plurality of play thick liquid holes 332 on the slip casting pipe 33, and each play thick liquid hole 332 distributes along the length and the circumference of slip casting pipe 33 and sets up, can make things convenient for the even slip casting to different positions, does benefit to the even closely knit packing of thick liquid.

The steel grating 31 can be constructed and simultaneously the grouting guide pipe 33 with phi 42 is arranged to strengthen deep surrounding rock, the length of the grouting guide pipe is approximately 2.5-m-3.5 m, the external insertion angle is 30 degrees, the circumferential spacing is 1m, the longitudinal spacing is equal to the grating spacing, the quincuncial type grouting material is cement mortar, and the grouting pressure can be set according to specific working conditions.

Example two

An embodiment II of the present application provides a construction method of the station foundation pit construction structure in the above embodiment I, including:

s1, constructing a fender post 1 in an area without the influence of a pipeline 2, wherein the fender post 1 is positioned at the bottom of the existing pipeline 2 to form a vacant part 7;

before the foundation pit is excavated, the pipeline 2 conflicts with the excavation range of the foundation pit, the pipeline 2 cannot be changed or is difficult to change due to other reasons, the enclosure structure without the influence range of the pipeline 2 can be firstly manufactured, the enclosure pile 1 avoids the pipeline 2 to be arranged into a non-closed structure, two vacant parts 7 positions avoiding the pipeline 2 are formed, the existing pipeline 2 cannot interfere with the whole construction process of the enclosure pile 1, and the construction of the enclosure pile 1 can be smoothly unfolded.

And S2, constructing the crown beam 4 on the fender post 1.

After the construction fender pile 1 is finished, the crown beam 4 can be constructed.

And S3, constructing a pipeline support body 5 on the crown beam 4, and suspending the existing pipeline 2 through the pipeline support body 5.

The pipeline support body 5 can adopt materials such as army beams or I-steel to carry out in-situ suspension protection on the pipeline 2. After the pipeline 2 is suspended for protection, an excavation process can be performed.

And S4, excavating a foundation pit, and constructing a pile plate wall 3 at the 7 position of the vacant part.

After the strength of the crown beam 4 meets the requirement, foundation pit excavation is started, a pile plate wall 3 is constructed by adopting a reverse hanging well wall method below the pipeline 2, the fender post 1 of the application avoids the pipeline 2 to be arranged into a non-closed structure, two sides are formed to avoid the 7-position of the vacant part of the pipeline 2, the 7-position later stage of the vacant part is closed through the construction pile plate wall, the station foundation pit construction structure of the application can well solve the problems that the pipeline 2 is difficult in migration and change process, the risk is high and the like, the construction period and the cost are also controllable, and the risk and difficulty of the pipe migration construction in the earlier stage of subway construction are reduced.

Optionally, step S4 includes:

dividing the excavated foundation pit into a plurality of excavation processes, controlling each excavation depth according to the spacing of each steel grating 31 until the excavation is finished, completing the construction of the station foundation pit construction structure below the pipeline 2, wherein each excavation process comprises the following steps, and each excavation process comprises the following steps:

s41, hanging an inner net sheet on the soil body of the vacant part, additionally arranging connecting parts on the pile bodies at two sides of the vacant part 7, connecting a plurality of connecting beams on the connecting parts on the pile bodies at two sides, wherein each connecting beam is positioned at the outer side of the inner net sheet;

wherein, before step S41, a layer of concrete is pre-sprayed on the surface of the soil body at the 7 position of the vacancy, and then the connecting part and the connecting beam are installed.

The connecting portion may be steel plates, each steel plate is sequentially arranged along the length direction (longitudinal direction) of the corresponding pile body, the steel grid 31 includes a plurality of connecting beams, each connecting beam is sequentially arranged at intervals along the length direction (longitudinal direction) of the pile body, and two ends of each connecting beam are respectively welded on two steel plates with opposite positions on two pile bodies on two sides of the hollow portion 7. The steel plates may be fixed to the corresponding pile bodies by expansion bolts, or holes may be bored in the pile bodies to expose the reinforcing bars therein, and then the steel plates are welded to the reinforcing bars in the pile bodies, and the connection beams are welded to the steel plates, thereby making the pile plate wall 3 and the pile body into an integrated structure.

S42, hanging an outer net piece on the outer side of each connecting beam, wherein the net piece can provide adhesion points for the subsequent sprayed concrete.

S43, spraying concrete on each connecting beam and the net sheet, wherein the concrete can be adhered to the net sheet and each connecting beam.

The C25 early strength concrete can be sprayed on the outer net sheet, the thickness can be 0.4m, and the pile plate wall 3 can be thicker, so that the structural strength of the pile plate wall 3 is obviously enhanced.

Optionally, step S42 is followed by a step of inserting a plurality of grouting conduits 33, wherein one end of each grouting conduit 33 extends into the soil body at the rear part of the steel grating 31 formed by the connecting beams. It should be noted that although the soil surface is pre-sprayed with a layer of concrete, the pre-sprayed concrete has a small thickness and is not completely hardened when the grouting duct 33 is inserted, and the grouting duct 33 can smoothly pass through and be inserted into the soil.

Step S44 is further included after step S43, to fill the grouting pipe 33 with slurry.

Optionally, a step of covering the nozzle of each grouting duct 33 with a cover is further included before step S43, to prevent the grouting duct 33 from being plugged in step S43.

Between step S43 and step S44, a step of removing the cover is further included;

in step S44, after the end of the grouting, the grouting pipe 33 is left in the pile sheet wall 3.

The grouting guide pipe 33 can be a metal pipe, the diameter of the grouting guide pipe 33 can be phi 42, the grouting guide pipe 33 can be used for reinforcing deep surrounding rock, the length of the grouting guide pipe 33 can be 3m, the external insertion angle is 30 degrees, the circumferential spacing is 1m, the longitudinal spacing is equal to the grid spacing, the quincuncial type grouting material can be cement mortar, and the grouting pressure can be set according to specific working conditions.

The foregoing description is only illustrative of the preferred embodiment of the present utility model, and is not to be construed as limiting the utility model, but is to be construed as limiting the utility model to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present utility model without departing from the scope of the utility model.

Claims (10)

1. The utility model provides a station foundation ditch construction structure which characterized in that includes:

existing pipelines;

a fender post, wherein a vacant part is formed in the fender post corresponding to the area of the existing pipeline;

the pile plate wall is connected to the guard piles and seals the gap;

the crown beam is supported on the fender post and the pile plate wall and is used for fixedly connecting the fender post and the plate wall;

the pipeline supporting body, the pipeline supporting body both ends support respectively in the crown beam corresponds the position of vacancy portion, set up a plurality of rings on the pipeline supporting body, each rings is followed the length direction of pipeline supporting body sets gradually the interval, and each rings supports existing pipeline.

2. The station pit construction structure of claim 1, wherein a plurality of shims are provided on the pipeline support body;

the two ends of the hanging ring are respectively connected to the corresponding gaskets;

the hanging ring and the gasket form a closed ring.

3. The station pit construction structure of claim 2, wherein the spacer extends in a direction perpendicular to a length of the pipeline support body;

two connecting holes are formed in the gasket;

and two ends of the hanging ring are respectively connected with the two connecting holes.

4. A station pit construction structure according to claim 3 wherein the lifting ring comprises two screws and a curved flat steel;

the connecting hole is provided with an internal thread;

the screws are respectively connected with the corresponding connecting holes in a threaded mode, and two ends of the flat steel are respectively connected with the two screws.

5. The station pit construction structure of claim 4, wherein the screw and the flat steel are welded and fixed.

6. The station pit construction structure of claim 5, wherein the pipeline support body comprises three i-beams, each of the i-beams being arranged in parallel and at intervals, two gaps being formed between each of the i-beams;

the gaskets are respectively welded and fixed with the I-steel;

the two connecting holes are opposite to the two gaps.

7. The station pit construction structure of claim 1, wherein the pile plate wall has a steel grid, a mesh sheet and a concrete layer;

the steel grating is connected to the fender post;

the net piece set up in the both sides of steel grating, concrete layer connect in steel grating and net piece.

8. The station pit construction structure according to claim 7, wherein the guard piles are provided with connecting portions on pile bodies located on both sides of the vacant portions;

the steel grating is fixed on the connecting part.

9. The station pit construction structure according to claim 8, wherein the connection portion includes a plurality of steel plates, each of which is provided in order along a length direction of the corresponding pile body;

the steel grating comprises a plurality of connecting beams, the connecting beams are sequentially arranged at intervals along the length direction of the pile body, and two ends of each connecting beam are respectively welded on two steel plates which are opposite in position on two pile bodies on two sides of the vacant part.

10. The station pit construction structure of claim 9, wherein the steel plates are fixed to the corresponding pile bodies by expansion bolts, or the steel plates are welded to a plurality of reinforcing bars, each of which is anchored in a pile body.

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