CN115977103A - Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof - Google Patents
Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof Download PDFInfo
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- CN115977103A CN115977103A CN202211625403.6A CN202211625403A CN115977103A CN 115977103 A CN115977103 A CN 115977103A CN 202211625403 A CN202211625403 A CN 202211625403A CN 115977103 A CN115977103 A CN 115977103A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a supporting structure for an upper span track section to be built of an open-cut tunnel and a construction method thereof, wherein the bottom of the open-cut tunnel is provided with at least two rows of downwards extending bottom plate pile foundations; the track section to be built penetrates through the two adjacent rows of the bottom plate pile foundations in parallel; the foundation pit supporting piles are distributed on two opposite sides of the open-cut tunnel along the length direction of the open-cut tunnel; the foundation pit supporting piles on each side of the open-cut tunnel adopt double rows of supporting piles along the length direction of the open-cut tunnel, wherein the upper ends of the supporting piles of the foundation pit in the row close to the foundation pit are connected into a whole through crown beams; the upper ends of the foundation pit supporting piles which are positioned on the same side of the open cut tunnel and are adjacent to different rows are connected into a whole through pile top connecting beams; and base plate pile foundations are respectively arranged on two sides of the to-be-built track section so as to bear the open-cut tunnel, and the influence of track construction on the open-cut tunnel is reduced.
Description
Technical Field
The invention relates to a supporting structure for an upper span rail to be built interval of an open trench tunnel and a construction method thereof, and belongs to the technical field of building construction.
Background
Traffic facilities such as subways and urban expressways can effectively relieve urban traffic congestion and optimize urban spatial layout. Traffic facilities such as subways and urban expressways relate to the construction of a large number of underground tunnels and passages, and junction tunnels with high construction difficulty are common in the construction process.
Meanwhile, the construction of each tunnel project is difficult to be coordinated by project establishment time, construction progress and the like, so that the moving cost and the changing cost of the construction project at the later stage are reduced, the construction cost is protected, resource waste is avoided, the construction safety is ensured, and construction conditions for planning the construction project should be reserved for the construction of the project constructed at the current stage.
For example, CN217870505U is an excavation supporting structure for excavation of a foundation pit above a tunnel, and discloses a new supporting structure for construction of foundation engineering above a subway tunnel;
the supporting structure for excavation of the foundation pit below the tunnel is required, after construction of the open trench tunnel is completed, the lower soil body is loaded greatly, two tunnel holes are excavated at the lower side of the open trench tunnel during construction of later-stage track sections, and the structural stability of the upper tunnel is greatly influenced.
Disclosure of Invention
The invention aims to provide a supporting structure for an upper span rail to be built section of an open trench tunnel and a construction method thereof, and aims to solve the problem that construction conditions for planning construction projects should be reserved for construction projects in construction of project projects of current construction proposed in the background technology.
The technical scheme of the invention is as follows:
the utility model provides a stride on open cut tunnel and wait to build interval supporting construction of track, includes:
the tunnel comprises an open-cut tunnel, wherein the bottom of the open-cut tunnel is provided with at least two rows of downwards extending bottom plate pile foundations;
the track section to be built penetrates through the two adjacent rows of the bottom plate pile foundations in parallel;
the foundation pit supporting piles are distributed on two opposite sides of the open-cut tunnel along the length direction of the open-cut tunnel;
the foundation pit supporting piles on each side of the open-cut tunnel are double rows of supporting piles along the length direction of the open-cut tunnel, wherein the upper ends of the rows of foundation pit supporting piles adjacent to the foundation pits are connected into a whole through crown beams;
and the pile top connecting beam is positioned on the same side of the open cut tunnel and adjacent different rows, and the upper ends of the foundation pit supporting piles are connected into a whole through the pile top connecting beam.
Preferably, the foundation pit support piles on each side of the open-cut tunnel are double-row support piles.
Preferably, the foundation pit support piles extend downwards from the ground.
Preferably, part of reinforcement cages in the foundation pit support piles are made of glass fiber reinforcements.
Preferably, the floor pile foundation comprises a reinforcement cage and concrete;
the steel reinforcement cage includes main muscle, plus strength hoop, triangle hoop and the interior hoop of putting more energy into, interior hoop and the hoop of putting more energy into is arranged and is set up the inside and outside both sides at main muscle respectively along main muscle length direction with plus strength hoop.
Preferably, the external hoops are densely distributed in the area corresponding to the depth of the track section to be built.
Preferably, the inner side of the main rib is provided with a triangular stiffening hoop which is of a triangular structure and is arranged along the length direction of the main rib.
A construction method for a supporting structure of a span rail section to be built on an open trench tunnel comprises the following steps:
constructing a foundation pit supporting pile, driving a protective cylinder into a ground setting position, drilling, placing a reinforcement cage in the hole, pouring concrete to form the foundation pit supporting pile, and pouring a crown beam and a pile top connecting beam at the upper end of the foundation pit supporting pile;
constructing a foundation pit, namely digging a foundation pit for accommodating the open-cut tunnel on the ground;
constructing a bottom plate pile foundation, namely driving a pile casing into a foundation pit, drilling holes, placing a reinforcement cage in the holes, and pouring concrete to form the bottom plate pile foundation;
and (4) constructing the bottom plate of the open cut tunnel, and pouring the structural bottom plate of the open cut tunnel at the upper end of the pile foundation of the bottom plate.
Preferably, in the process of foundation pit construction, loose rock soil at the edge of the foundation pit is cleaned in time, and a layer of support is excavated.
Preferably, after the drilling construction of foundation pit support pile construction and/or bottom plate pile foundation construction is completed, the hole bottom is immediately cleaned, and the phenomenon that slurry is precipitated due to overlong interval time is avoided.
The invention has the following beneficial effects:
and base plate pile foundations are respectively arranged on two sides of the to-be-built track section so as to bear the open-cut tunnel, and the influence of track construction on the open-cut tunnel is reduced.
And the foundation pit supporting piles and the later-stage spray anchor structure are used for maintaining the stability of the foundation pit slope soil body together. And the steel reinforcement cage in the part foundation ditch fender pile adopts the glass fiber muscle, under the prerequisite that does not influence foundation ditch fender pile intensity, when waiting to build the interval tunnel shield of track and construct the construction, can directly break away, need not additionally breaking away, improves the efficiency of construction.
Drawings
FIG. 1 is a top plan view and a side view of an open trench tunnel according to the present invention;
FIG. 2 is a top view and a side view of a section of track to be constructed according to the present invention;
fig. 3 is a plan view of the support structure system of the present invention;
FIG. 4 is a first direction position diagram of the space matching between the track section to be built and the open cut tunnel according to the present invention;
FIG. 5 is a second directional position diagram of the cooperation between the section of the track to be constructed and the open trench tunnel space according to the present invention;
FIG. 6 is a schematic structural view of the reinforcement cage of the present invention;
FIG. 7 is a top view of the reinforcement cage of the present invention;
FIG. 8 is a construction flow chart of the present invention.
The reference numbers in the figures denote:
1. open excavation of the tunnel; 2. a track interval to be built; 3. a structural floor; 4. a structural roof; 5. a middle wall; 6. a side wall; 7. constructing a joint; 8. a shield sideline of the track section; 9. a track section lining structure; 10. a track section centerline; 11. a floor pile foundation; 12. supporting piles of the foundation pit; 13. connecting the pile top with a beam; 14. a crown beam; 15. a main rib; 16. an outer stiffening hoop; 16-1, encrypting a stiffening hoop; 17. a triangular stiffening hoop; 18. an inner stiffening band.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Example (b):
as shown in fig. 1, the open-cut tunnel 1 is composed of a structural bottom plate 3, a structural top plate 4, a middle wall 5, side walls 6 and construction joints 7, wherein the side walls 6 are positioned between the structural bottom plate 3 and the left side and the right side of the structural top plate 4, and the middle wall 5 is positioned between the structural bottom plate 3 and the middle of the structural top plate 4; this is the existing structure.
The section 2 of the track to be built is shown in fig. 2.
The support structure floor plan is shown in figure 3. The foundation pit is characterized in that double rows of foundation pit supporting piles 12 are adopted on two sides of the foundation pit, the excavation section of the foundation pit is large, the transverse width of the foundation pit is large, and a cross beam cannot be adopted for supporting, so that the lateral rigidity is enhanced by adopting the double rows of foundation pit supporting piles 12, the double rows of foundation pit supporting piles 12 are connected into a whole by adopting 14 crown beams and pile top connecting beams 13, the foundation pit supporting piles 12 extend downwards from the ground and are inserted into the ground, one row of foundation pit supporting piles 12 close to the foundation pit in the double rows of foundation pit supporting piles 12 are connected by the crown beams 14, and the other row of foundation pit supporting piles 12 on the outer side and the one row of foundation pit supporting piles 12 on the inner side are connected by the pile top connecting beams 13 in a pairwise mode.
Foundation ditch fender pile 12 includes steel reinforcement cage and concrete, as shown in fig. 3, can pass partial foundation ditch fender pile 12 when waiting to build interval 2 construction of track in the later stage, and the steel reinforcement cage in this partial foundation ditch fender pile 12 adopts the glass fiber muscle, when waiting to build interval 2 tunnel shield of track and construct, can directly break away.
The spatial relationship between the section 2 of the track to be built and the open trench tunnel 1 is shown in fig. 4-5, the section 2 of the track to be built is positioned below the open trench tunnel 1, and the open trench tunnel 1 relatively spans the sections 2 of the track to be built which are perpendicular to each other.
The bottom of the open-cut tunnel 1 is provided with three rows of bottom plate pile foundations 11, the bottom plate pile foundations 11 and the tunnel 1 jointly form a frame structure, so that the influence of construction of the track interval 2 to be built on the open-cut tunnel 1 in the later period is reduced, and the track interval 2 to be built is relatively located in the middle position between the two adjacent rows of bottom plate pile foundations 11.
The reinforcement cage reinforcement of the floor pile foundation 11 is shown in fig. 6-7. The reinforcement cage is composed of a main reinforcement 15, an external reinforcing hoop 16, a triangular reinforcing hoop 17 and an internal reinforcing hoop 18, wherein the external reinforcing hoop 16 is uniformly welded on the outer side of the main reinforcement 15 along the length direction of the main reinforcement 15, and the internal reinforcing hoop 18 is uniformly welded on the inner side of the main reinforcement 15 along the length direction of the main reinforcement 15; triangular stiffening hoops 17 are arranged in the reinforcement cage at intervals of 4m along the length direction of the main reinforcement 15 so as to strengthen the hooping of the hoisting rigidity of the reinforcement cage and ensure that the reinforcement cage is not extruded and deformed, and the triangular stiffening hoops 17 are welded on the inner stiffening hoops 18;
the outer stiffening hoops 16 are arranged at the shield section depth of the track section 2 to be built in an encrypted mode to form the encrypted stiffening hoops 16-1 shown in the figure 6, the track section 2 to be built is reinforced, and cost is low.
The construction process of the supporting structure system spanning the track section 2 to be built on the open-cut tunnel 1 is shown in fig. 8.
Construction preparation: and (4) performing site surveying work, and performing technical preparation and resource preparation work to ensure the smooth operation of site construction.
Measuring and lofting: the building is measured and positioned according to the requirement of the red line, and the building can be used after multi-party personnel recheck a measurement baseline, a level point, a control point and a pile site and sign and approve the measurement baseline, the level point, the control point and the pile site.
The main construction process of the foundation pit support pile 12 comprises the following steps: after positioning and paying off, embedding a pile casing at a preset position, and performing pile position retesting and elevation checking difference to ensure that the construction position of a pile foundation is accurate; then, a drilling machine enters a field and performs drilling operation; after the drilling construction is finished, immediately cleaning the bottom of the hole to avoid mud sedimentation caused by overlong interval time; and then hoisting the manufactured reinforcement cage into the hole, installing a concrete guide pipe and pouring concrete, wherein secondary hole cleaning is needed for drilling holes with longer pouring time intervals.
Constructing a crown beam 14 and a pile top connecting beam 13: after the foundation pit supporting pile 12 is maintained to be alive, cleaning up the miscellaneous soil of the pile head, breaking the pile head and straightening the main reinforcement of the pile head; leveling the ground and pouring a first cushion layer; and (3) constructing the crown beam 14 and the pile top connecting beam 13 after the first cushion layer is maintained, wherein the pile head main reinforcement 15 straightened by the foundation pit support pile 12 extends into the crown beam 14 and the pile top connecting beam 13.
Excavation of a foundation pit: after the foundation pit supporting piles 12, the crown beams 14 and the pile top connecting beams 13 are constructed, foundation pit excavation is started, the foundation pit supporting piles 12 are divided into four rows, wherein the two rows of foundation pit supporting piles 12 are located on the left side of the foundation pit, and the two rows of foundation pit supporting piles 12 are located on the right side of the foundation pit.
And (3) supporting a foundation pit: and in the excavation process, loose rock soil at the edge of the foundation pit is cleaned in time, a layer of support is excavated, and overexcavation is strictly prohibited.
Constructing a bottom plate pile foundation 11: constructing on the bottom wall of the foundation pit, and the construction process is the same as the construction process of the foundation pit support pile 12; after the construction of the bottom plate pile foundation 11 is completed, cleaning up the miscellaneous soil, breaking the pile head, straightening the main reinforcement 11, and pouring a second cushion layer.
And (5) constructing the bottom plate structure 3 of the open cut tunnel 1 after the second cushion layer is maintained, wherein the upper ends of the main ribs 15 in the bottom plate pile foundation 11 are straightened and then extend into the bottom plate structure 3 of the open cut tunnel 1. And then, the construction is continued to build the open-cut tunnel 1.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a stride on open cut tunnel and wait to build interval supporting construction of track which characterized in that: the method comprises the following steps:
the tunnel comprises an open-cut tunnel (1), wherein the bottom of the open-cut tunnel (1) is provided with at least two rows of downwards extending bottom plate pile foundations (11);
the track section (2) to be built penetrates through the two adjacent rows of the bottom plate pile foundations (11) in parallel;
the foundation pit supporting piles (12) are distributed on two opposite sides of the open-cut tunnel (1) along the length direction of the open-cut tunnel;
the foundation pit supporting piles (12) on each side of the open-cut tunnel (1) are double rows of supporting piles, wherein the upper ends of the foundation pit supporting piles (12) close to the foundation pit are connected into a whole through crown beams (14);
and the pile top connecting beam (13) is positioned on the same side of the open-cut tunnel (1) and adjacent different rows, and the upper ends of the foundation pit supporting piles (12) are connected into a whole through the pile top connecting beam (13).
2. The structure for supporting the section of the track to be built spanning the open trench tunnel according to claim 1, wherein: and the reinforcement cage in the foundation pit support pile (12) is made of glass fiber reinforcement at the part overlapped with the track section (2) to be built.
3. The structure for supporting the section of the track to be built spanning the open trench tunnel according to claim 1, wherein: the bottom plate pile foundation (11) comprises a reinforcement cage and concrete;
the steel reinforcement cage includes main muscle (15), extra strength hoop (16), triangle hoop (17) and the interior hoop (18) of putting more energy into, interior hoop (18) of putting more energy into and extra strength hoop (16) are arranged and are set up the inside and outside both sides at main muscle (15) respectively along main muscle (15) length direction.
4. The interval supporting structure of the track to be built striding on the open-cut tunnel according to claim 3, characterized in that: the outer stiffening hoops (16) are densely distributed in the area corresponding to the depth of the track section (2) to be built.
5. The interval supporting structure of the track to be built striding on the open-cut tunnel according to claim 3, characterized in that: the triangle stiffening hoop (17) is arranged on the inner side of the main rib (15), and the triangle stiffening hoop (17) is of a triangular structure and is arranged along the length direction of the main rib (15).
6. The construction method for the supporting structure across the track section to be built on the open-cut tunnel according to any one of claims 1 to 5 is applied, and is characterized in that: the method comprises the following steps:
constructing a foundation pit supporting pile, driving a pile casing into the ground, setting a position, drilling a hole, placing a reinforcement cage in the hole, pouring concrete to form a foundation pit supporting pile (12), and pouring a crown beam (14) and a pile top connecting beam (13) at the upper end of the foundation pit supporting pile (12);
constructing a foundation pit, namely digging a foundation pit for accommodating the open cut tunnel (1) from the ground;
constructing a bottom plate pile foundation, namely driving a pile casing into a foundation pit, drilling holes, placing a reinforcement cage in the holes, and pouring concrete to form the bottom plate pile foundation (11);
and (3) carrying out open-cut tunnel bottom plate construction, namely pouring a structural bottom plate (3) of the open-cut tunnel (1) at the upper end of a bottom plate pile foundation (11).
7. The construction method of the supporting structure across the track section to be built on the open-cut tunnel according to claim 6, characterized in that: in the process of foundation pit construction, loose rock soil at the edge of the foundation pit is cleaned in time, and a layer of support is excavated.
8. The construction method of the supporting structure across the track section to be built on the open-cut tunnel according to claim 6, characterized in that: after the drilling construction of foundation pit support pile construction and/or bottom plate pile foundation construction is completed, hole bottom cleaning is immediately carried out, and mud sedimentation caused by overlong interval time is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625403.6A CN115977103A (en) | 2022-12-16 | 2022-12-16 | Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211625403.6A CN115977103A (en) | 2022-12-16 | 2022-12-16 | Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof |
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| Publication Number | Publication Date |
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| CN115977103A true CN115977103A (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211625403.6A Pending CN115977103A (en) | 2022-12-16 | 2022-12-16 | Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117634987A (en) * | 2024-01-25 | 2024-03-01 | 中建安装集团有限公司 | Building high slope construction evaluation management system and method based on Internet of things |
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2022
- 2022-12-16 CN CN202211625403.6A patent/CN115977103A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117634987A (en) * | 2024-01-25 | 2024-03-01 | 中建安装集团有限公司 | Building high slope construction evaluation management system and method based on Internet of things |
| CN117634987B (en) * | 2024-01-25 | 2024-04-02 | 中建安装集团有限公司 | Building high slope construction evaluation management system and method based on Internet of things |
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