CN216515626U - Supporting construction for underpass railway section utility tunnel foundation pit - Google Patents
Supporting construction for underpass railway section utility tunnel foundation pit Download PDFInfo
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- CN216515626U CN216515626U CN202123014861.XU CN202123014861U CN216515626U CN 216515626 U CN216515626 U CN 216515626U CN 202123014861 U CN202123014861 U CN 202123014861U CN 216515626 U CN216515626 U CN 216515626U
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Abstract
The utility model discloses a supporting structure for a comprehensive pipe gallery foundation pit of an underpass railway section, belongs to the technical field of supporting structures, and solves the problem that when an existing supporting structure is not provided with a dewatering well, the underground water level drops suddenly when a pipe gallery passes through the position of a railway bridge section, so that the distribution of a foundation bearing stratum of a railway pier is greatly influenced. The utility model comprises cast-in-place supporting cantilever piles arranged at equal intervals, a high-pressure jet grouting water-stop curtain arranged between every two cast-in-place supporting cantilever piles, a crown beam arranged at the top of each cast-in-place supporting cantilever pile and a concrete cross brace arranged on the crown beam and used for supporting the cast-in-place supporting cantilever piles. The utility model is used for supporting the foundation pit of the comprehensive pipe gallery in the underpass railway section.
Description
Technical Field
The utility model provides a wear railway section utility tunnel supporting construction for foundation ditch for under wear railway section utility tunnel supporting of foundation ditch, belongs to supporting construction technical field.
Background
The design of the underpass railway section adopts a bridge scheme with high safety factor, the lower part of the bridge adopts a pile foundation and pier studs, the two sides of the bridge adopt light bridge abutments, the upper part of the bridge adopts an equal-height prestress continuous cast-in-place box girder, and the adverse effect on the current railway pier and the pile foundation is avoided.
The utility tunnel is an underground city pipeline utility tunnel, namely, a tunnel space is built underground the city, various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage and the like are integrated, a special overhaul port, a lifting port and a monitoring system are arranged, unified planning, unified design, unified construction and management are implemented, and the utility tunnel is an important infrastructure and a 'lifeline' for guaranteeing city operation.
To wearing iron road section utility tunnel's ten minutes is important under, then just to wearing the support of iron road section utility tunnel foundation ditch under with very important, but the current support of wearing iron road section utility tunnel foundation ditch down has following technical problem:
1. the existing supporting structure has the problem that the underground water level drops suddenly when a pipe gallery passes through the position of a railway bridge section under the condition that a dewatering well is not arranged, so that the distribution of a foundation bearing stratum of a railway pier is greatly influenced;
2. the existing supporting structure has poor soil retaining effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a supporting structure for a comprehensive pipe gallery foundation pit of an underpass railway section, which solves the problem that the distribution of a foundation bearing stratum of a railway pier is greatly influenced by the steep drop of underground water level when a pipe gallery passes through a railway bridge section under the condition that a dewatering well is not arranged in the conventional supporting structure.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides a wear railway section utility tunnel supporting construction for foundation ditch, includes the perfusion support cantilever pile that equidistant setting, sets up the high-pressure jet grouting water-stop curtain between two liang of perfusion support cantilever piles, sets up the crown beam at perfusion support cantilever pile top and sets up the concrete stull that struts the perfusion support cantilever pile on the crown beam.
And further, a concrete panel is arranged between the cast-in-place support cantilever piles on one side of the foundation pit, and the concrete panel comprises a hanging net arranged between the cast-in-place support cantilever piles and a concrete layer sprayed on the hanging net.
Further, the hanging net is a bidirectional steel bar net piece, the bidirectional steel bar net piece comprises an upper steel bar net piece, a lower steel bar net piece and connecting steel bars for connecting the upper steel bar net piece and the lower steel bar net piece;
and reinforcing ribs are arranged on the upper reinforcing mesh and the lower reinforcing mesh at equal intervals.
Further, the high-pressure jet grouting waterproof curtain is composed of two rows of high-pressure jet grouting piles arranged on every two poured and supported cantilever piles, pile cores of the first row of high-pressure jet grouting piles and pile cores of adjacent poured and supported cantilever piles are located on the same straight line, and the second row of high-pressure jet grouting piles are connected with the first row of high-pressure jet grouting piles located on the opposite side of the foundation pit.
Further, the diameter of the cast-in-place cantilever pile is 1.2m-1.5m, the length of the cast-in-place cantilever pile is 15m-18m, and the distance between the pile cores of every two cast-in-place cantilever piles is 2.5m-2.8 m.
Furthermore, the pile center distance of the high-pressure jet grouting pile is 500-600 mm, the pile length is 12-15 m, and the pile top of the high-pressure jet grouting pile and the pile top of the cast-in-place support cantilever pile are located on the same horizontal plane.
Further, the thickness of the concrete panel is 100mm, and the distance between every two reinforcing ribs is 15 m.
Furthermore, the distance between every two concrete cross braces is 6m-7 m.
Further, the concrete panel and the cast-in-place supporting cantilever pile are connected in an embedded mode through steel bar drilling.
Compared with the prior art, the utility model has the advantages that:
the supporting structure of the underpass railway section comprehensive pipe gallery foundation pit is composed of a pouring supporting cantilever pile, a high-pressure rotary spraying water-stopping curtain, a crown beam and a concrete cross brace, the high-pressure rotary spraying water-stopping curtain is formed among the pouring supporting cantilever piles by adopting the high-pressure rotary spraying piles under the condition that a dewatering well is not arranged, the layer-by-layer excavation of the underpass railway section comprehensive pipe gallery foundation pit is realized under the condition that the underground water level is reduced layer by layer in the high-pressure rotary spraying water-stopping curtain, and the abrupt drop of the underground water level is avoided when a pipe gallery passes through the position of a railway bridge section, so that the problem that the distribution of a foundation bearing layer of a railway pier foundation is greatly influenced is avoided, the crown beam can strengthen the connection among the supporting cantilever piles, and the railway pier foundation can be protected;
secondly, arranging concrete panels among the poured and supported cantilever piles on one side of the foundation pit to strengthen the soil retaining effect;
the hanging net is a bidirectional reinforcing steel bar net piece, and reinforcing ribs are arranged on the bidirectional reinforcing steel bar net piece, so that the hanging net is high in strength and good in soil retaining effect;
fourthly, the high-pressure jet grouting waterproof curtain has good effect as a waterproof measure, and has good supporting effect when being combined with a pouring supporting cantilever pile;
the utility model defines the size and the interval of the cast-in-place support cantilever pile and the high-pressure jet grouting pile, the thickness and the interval of the concrete panel and the interval of the concrete cross braces, and aims to ensure that the support structure achieves the optimal support effect;
the concrete panel and the cast-in-place supporting cantilever pile are connected in an embedded mode through the steel bar drilling, so that the connection effect of the concrete panel and the cast-in-place supporting cantilever pile is enhanced, and the soil retaining effect is enhanced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the matching of the cast-in-place support cantilever pile, the high-pressure jet grouting waterproof curtain and the concrete panel, wherein the concrete panel is completely contacted with the near side adjacent to the high-pressure jet grouting waterproof curtain, and only the setting position is shown in the diagram;
FIG. 3 is a schematic view of a netting of the present invention;
in the figure: 1-pouring a supporting cantilever pile, 2-high-pressure jet grouting waterproof curtains, 3-crown beams, 4-concrete crossbars, 5-concrete panels, 6-hanging nets, 7-upper reinforcing mesh sheets, 8-lower reinforcing mesh sheets, 9-connecting reinforcing steel bars, 10-reinforcing ribs, 11-high-pressure jet grouting piles and 12-reinforcing steel bars.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or element which is referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," "third," and the like, if any, are only used to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
In order to solve current supporting construction under the condition that does not set up precipitation well, when the pipe gallery passes through railway bridge position, ground water level descends suddenly to the problem that produces great influence to railway pier foundation bearing stratum distribution. As shown in fig. 1, a supporting structure for a comprehensive pipe gallery foundation pit in a underpass railway section is provided, which comprises cast-in-place supporting cantilever piles 1 arranged at equal intervals, a high-pressure jet grouting waterproof curtain 2 arranged between every two cast-in-place supporting cantilever piles 1, a top beam 3 arranged at the top of each cast-in-place supporting cantilever pile 1, and a concrete cross brace 4 arranged on the top beam 3 and used for supporting the cast-in-place supporting cantilever piles 1.
In practice, firstly, laying out and positioning the cast-in-place supporting cantilever pile, then, sequentially drilling a drill in place, embedding a pile casing, punching, cleaning holes, descending a guide pipe and pouring concrete to form the cast-in-place supporting cantilever pile, then, carrying out high-pressure rotary spraying to form a high-pressure rotary spraying water-stopping curtain, forming the high-pressure rotary spraying water-stopping curtain, and installing a crown beam and a concrete cross brace. The supporting structure of the underpass railway section comprehensive pipe gallery foundation pit is formed by adopting cast-in-place supporting cantilever piles, high-pressure jet grouting water-stop curtains, crown beams and concrete cross braces, the high-pressure jet grouting water-stop curtains are formed by adopting the high-pressure jet grouting piles among the cast-in-place supporting cantilever piles under the condition that a precipitation well is not arranged, the layer-by-layer excavation of the underpass railway section comprehensive pipe gallery foundation pit is realized under the condition that the underground water level is reduced layer by layer in the high-pressure jet grouting water-stop curtains (namely, the pipe gallery construction is carried out by adopting a precipitation mode in the foundation pit), and when the pipe gallery passes through the railway bridge section, the abrupt drop of the underground water level is avoided, so that the problem that the distribution of the bearing layer of the railway bridge pier foundation is greatly influenced is avoided, the connection among the cast-in-place supporting cantilever piles can be strengthened by the crown beams, and the railway pier foundation can be protected.
Example 2
On the basis of the embodiment 1, a concrete panel 5 is arranged between the cast-in-place support cantilever piles 1 at one side of the foundation pit, and the concrete panel comprises a hanging net 6 arranged between the cast-in-place support cantilever piles 1 and a concrete layer sprayed on the hanging net 6. The hanging net 6 is a bidirectional steel bar net, the bidirectional steel bar net comprises an upper steel bar net 7, a lower steel bar net 8 and connecting steel bars 9 for connecting the upper steel bar net 7 and the lower steel bar net; and reinforcing ribs 10 are arranged on the upper reinforcing mesh 7 and the lower reinforcing mesh 8 at equal intervals.
In practice, concrete panels are formed by the construction of spraying concrete through the hanging nets, the concrete panels are arranged among the cast-in-place supporting cantilever piles to enhance the soil retaining effect, the hanging nets are bidirectional reinforcing steel bar net sheets, and reinforcing ribs are arranged on the bidirectional reinforcing steel bar net sheets, so that the hanging nets are high in strength and good in soil retaining effect.
The concrete panel 5 and the cast-in-place supporting cantilever pile 1 are connected in a drilling and embedding mode through the steel bars 12, and the purpose is to enhance the connection effect of the concrete panel and the cast-in-place supporting cantilever pile and further enhance the soil retaining effect.
Example 3
On the basis of the embodiment 2, the high-pressure jet grouting waterproof curtain 2 is composed of two rows of high-pressure jet grouting piles 11 arranged on two pairs of cast-in-place supporting cantilever piles 1, pile cores of the first row of high-pressure jet grouting piles and pile cores of adjacent cast-in-place supporting cantilever piles are located on the same straight line, and the second row of high-pressure jet grouting piles are connected with the first row of high-pressure jet grouting piles located on the opposite side of the foundation pit. The high-pressure jet grouting waterproof curtain has good effect as a waterproof measure and good supporting effect combined with a pouring supporting cantilever pile. Of course, other configurations are not excluded.
Example 4
On the basis of the embodiment 3, the pile diameter of the cast-in-place supporting cantilever pile 1 is 1.2m-1.5m, such as 1.3m or 1.4 m; the pile length is 15m-18m, such as 16m or 17 m; the pile center spacing of the supporting cantilever piles 1 is 2.5m-2.8m, such as 2.5m, 2.6m or 2.7 m.
The pile center spacing of the high-pressure jet grouting pile 11 is 500mm-600mm, such as 510mm, 520mm, 530mm, 540mm, 550mm, 560mm, 570mm, 580mm or 590mm, the pile length is 12m-15m, such as 13m or 14m, and the pile top of the high-pressure jet grouting pile 11 and the pile top of the cast-in-place support cantilever pile 1 are located on the same horizontal plane.
The thickness of the concrete panel 5 is 100mm, and the distance between every two reinforcing ribs 10 is 15 m.
The distance between every two concrete cross braces 4 is 6m-7 m.
The embodiment limits the size and the distance between the cast-in-place support cantilever pile and the high-pressure jet grouting pile, the thickness and the distance between the concrete panels and the distance between the concrete cross braces, and aims to enable the support structure to achieve the optimal support effect.
And a row of cast-in-place supporting cantilever piles can be arranged on the opposite side of the concrete panel, and the front row and the rear row of cast-in-place supporting cantilever piles are connected through connecting concrete so as to reinforce the supporting structure.
Claims (9)
1. The utility model provides a wear railway section utility tunnel supporting construction for foundation ditch which characterized in that: the concrete grouting support structure comprises grouting support cantilever piles (1) arranged at equal intervals, a high-pressure jet grouting water-stop curtain (2) arranged between every two grouting support cantilever piles (1), a top beam (3) arranged at the top of each grouting support cantilever pile (1), and a concrete cross brace (4) arranged on the top beam (3) and used for supporting each grouting support cantilever pile (1).
2. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 1, characterized in that: and a concrete panel (5) is arranged between the cast-in-place support cantilever piles (1) and comprises a hanging net (6) arranged between the cast-in-place support cantilever piles (1) and a concrete layer sprayed on the hanging net (6).
3. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 2, characterized in that: the hanging net (6) is a bidirectional steel bar net, the bidirectional steel bar net comprises an upper steel bar net (7), a lower steel bar net (8) and connecting steel bars (9) connecting the upper steel bar net (7) and the lower steel bar net (8);
and reinforcing ribs (10) are arranged on the upper reinforcing mesh (7) and the lower reinforcing mesh (8) at equal intervals.
4. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 3, characterized in that: the high-pressure jet grouting waterproof curtain (2) is composed of two rows of high-pressure jet grouting piles (11) arranged on every two poured and supported cantilever piles (1), pile cores of the first row of high-pressure jet grouting piles and pile cores of the adjacent poured and supported cantilever piles (1) are located on the same straight line, and the second row of high-pressure jet grouting piles are connected with the first row of high-pressure jet grouting piles located on the opposite side of the foundation pit.
5. The supporting structure for the underpass railway section utility tunnel foundation pit according to claim 4, characterized in that: the diameter of the cast-in-place supporting cantilever pile (1) is 1.2m-1.5m, the length of the pile is 15m-18m, and the distance between the centers of every two cast-in-place supporting cantilever piles (1) is 2.5m-2.8 m.
6. The supporting structure for the underpass railway section utility tunnel foundation pit according to claim 5, characterized in that: the distance between the pile centers of the high-pressure jet grouting piles (11) is 500-600 mm, the pile length is 12-15 m, and the pile tops of the high-pressure jet grouting piles (11) and the pile top of the cast-in-place support cantilever pile (1) are located on the same horizontal plane.
7. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 6, characterized in that: the thickness of the concrete panel (5) is 100mm, and the distance between every two reinforcing ribs (10) is 15 m.
8. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 7, characterized in that: the distance between every two concrete cross braces (4) is 6m-7 m.
9. The supporting structure for the underpass railway section comprehensive pipe gallery foundation pit according to claim 2, characterized in that: the concrete panel (5) is connected with the cast-in-place supporting cantilever pile (1) in a drilling and embedding way by adopting a steel bar (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123014861.XU CN216515626U (en) | 2021-12-03 | 2021-12-03 | Supporting construction for underpass railway section utility tunnel foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123014861.XU CN216515626U (en) | 2021-12-03 | 2021-12-03 | Supporting construction for underpass railway section utility tunnel foundation pit |
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| Publication Number | Publication Date |
|---|---|
| CN216515626U true CN216515626U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123014861.XU Active CN216515626U (en) | 2021-12-03 | 2021-12-03 | Supporting construction for underpass railway section utility tunnel foundation pit |
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| CN (1) | CN216515626U (en) |
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- 2021-12-03 CN CN202123014861.XU patent/CN216515626U/en active Active
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