CN112281861A - Support system for transfer node of urban rail transit transfer station and construction method - Google Patents
Support system for transfer node of urban rail transit transfer station and construction method Download PDFInfo
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- 238000012546 transfer Methods 0.000 title claims abstract description 107
- 238000010276 construction Methods 0.000 title claims abstract description 65
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- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 abstract description 9
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract description 2
- 238000005192 partition Methods 0.000 description 14
- 238000013461 design Methods 0.000 description 11
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- 238000009412 basement excavation Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
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Abstract
The invention provides a support system for transfer nodes of an urban rail transit transfer station and a construction method of the support system for the transfer nodes of the urban rail transit transfer station. The supporting system for the transfer node of the urban rail transit transfer station comprises an outer ring support, an inner ring support and inner and outer ring connecting members, wherein the outer ring support is arranged at the junction of a plurality of rail transit lines, the inner ring support and the outer ring support are concentrically arranged, and the inner ring support is a large ring beam inner ring support and is used for replacing a support system to improve the overall rigidity of the supporting system. The multi-ring stress system is reasonable in structural layout, the supporting system is high in overall rigidity and good in deformation control effect, the compression resistance of concrete is fully utilized, the water and soil pressure outside the supporting structure is converted into the compression bearing capacity of the supporting member, meanwhile, the construction efficiency is high, the construction period is shortened, the counter-supporting structure is not arranged on the inner side of the inner ring support, and the earthwork unearthing space is increased to the maximum extent.
Description
Technical Field
The invention relates to the technical field of rail transit construction, in particular to a supporting system for transfer nodes of an urban rail transit transfer station and a construction method for the supporting system for the transfer nodes of the urban rail transit transfer station.
Background
The urban rail transit is developed rapidly nowadays, rail transit routes develop to reticulation, double-line and multi-line transfer stations are more and more common, the function forms of the transfer stations are various, the implementation sequence of each line station is divided into synchronization and staging, and the construction conditions are complex. The standard subway station is of a rectangular structure, is simple in stress and design, and the design of transfer nodes is a difficult point, so that no unified, standard and effective construction method exists at present.
At present, a conventional subway supporting method adopts a pit-by-pit opposite-supporting system, and in the synchronous or staged construction operation process, a partition wall needs to be arranged at a transfer node to avoid an unfavorable stress system with a large internal corner.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of an intersection structure of two rail transit lines at a transfer station in the prior art; fig. 2 is a schematic diagram of a supporting system when two track traffic lines adopt pit separation to construct the supporting system at a transfer station in the prior art.
In fig. 1, two rail transit lines a are intersected, stress internal corners exist at four intersected corners of the lines, partition walls are required to be arranged on two sides to divide a foundation pit into a plurality of regular foundation pits b, the foundation pits are implemented by stages, a later foundation pit can be excavated after the construction of a main structure of the earlier foundation pit is finished, the method has a large influence on the construction period of the foundation pit implemented at the same stage, and the arrangement and chiseling of the partition walls c increase engineering cost and engineering construction procedures. A pair supporting system d is adopted in the foundation pit, the supporting space in the pair supporting system is a soil-out space, the common concrete support is 6-8 meters, the space between the lower steel supports is 3-4 meters, and the soil-out efficiency is limited.
Therefore, the disadvantages of the pit-by-pit and support-by-support system are summarized as follows: 1. the multiple lines are intersected, and a reentrant corner exists due to the fact that transfer nodes are irregular, a partition wall needs to be arranged to be divided into a plurality of regular foundation pits, and construction cost is increased due to the addition of a temporary partition wall, so that the problems of complicated construction procedures, long construction period and the like are caused; 2. the support is adopted, the support distance is dense (about 3 meters), the unearthed space is limited, and the construction efficiency is low.
Disclosure of Invention
In summary, how to solve the problems of the traditional technology that the construction process is complicated due to the internal corner structure caused by the intersection of multiple lines of the rail transit lines becomes a problem to be solved urgently by the technical staff in the field.
In order to solve the problems of the prior art, the invention provides the following technical scheme:
the invention provides a construction method of a support system at transfer nodes of an urban rail transit transfer station, which comprises the following steps:
step one, arranging a circular or polygonal outer ring support, and connecting a rail transit line for transfer at a transfer node of an urban rail transit transfer station through the outer ring support to eliminate an internal corner structure;
step two, arranging an inner ring support of a ring beam structure, and improving the overall rigidity of a support system;
and step three, arranging an inner ring connecting member and an outer ring connecting member for realizing the connection of the outer ring support and the inner ring support.
Preferably, in the construction method of the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the present invention further comprises: the method comprises the steps of firstly, prepositioning operation, obtaining a centroid of a virtual shape formed by rail transit line intersection, and taking the centroid as a stressed circle center of the outer ring support and the inner ring support.
Preferably, in the construction method of the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the present invention further comprises: and secondly, performing pre-operation, determining the type of the outer ring support according to stratum characteristics, and determining the construction range of the outer ring support according to the distance of buildings around the foundation pit and the pipeline moving and modifying space.
Preferably, in the construction method of the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the present invention further comprises: and step four, arranging a waist beam and a crown beam for improving the protection of the foundation pit and improving the rigidity of the supporting system.
The invention also provides a support system for the transfer nodes of the urban rail transit transfer station, which comprises the following components:
the outer ring support is a circular or polygonal annular support and is used for being arranged at the connection position of a plurality of rail transit lines;
the inner ring support and the outer ring support are arranged concentrically, and the inner ring support is a large ring beam inner ring support and is used for replacing a support system to improve the overall rigidity of the support system;
and the inner ring connecting member and the outer ring connecting member are arranged between the outer ring support and the inner ring support, connected with the outer ring support and the inner ring support and used for realizing the connection of the outer ring support and the inner ring support.
Preferably, in the support system at the transfer node of the urban rail transit transfer station provided by the invention, the stressed circle center of the outer ring support is concentric with the centroid of a virtual shape formed by the intersection of rail transit lines.
Preferably, in the support system at the transfer node of the urban rail transit transfer station provided by the invention, the inner and outer ring connecting members are side truss systems.
Preferably, in the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the present invention further comprises: and the plate support is arranged at the position required for force transmission outside the outer ring support.
Preferably, in the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the present invention further comprises: the inner ring is strutted and is provided with the multichannel on the direction of height, adjacent twice be provided with the lattice column between the inner ring is strutted.
Preferably, in the support system at the transfer node of the urban rail transit transfer station provided by the present invention, the inner ring support and the outer ring support are provided with the inner ring connecting member and the outer ring connecting member therebetween.
The invention has the following beneficial effects:
the invention provides a support system for transfer nodes of an urban rail transit transfer station and a construction method of the support system for the transfer nodes of the urban rail transit transfer station. The supporting system for the transfer node of the urban rail transit transfer station comprises an outer ring support, an inner ring support and inner and outer ring connecting members, wherein the outer ring support is arranged at the junction of a plurality of rail transit lines, the inner ring support and the outer ring support are concentrically arranged, and the inner ring support is a large ring beam inner ring support and is used for replacing a support system to improve the overall rigidity of the supporting system.
The advantages of the invention are summarized as follows: 1. the multi-ring stress system has reasonable structural layout, the supporting system has large integral rigidity and good deformation control effect, and the compressive property of concrete is fully utilized to convert the soil-water pressure outside the supporting structure into the compressive bearing capacity of the supporting member; 2. the construction efficiency is high, the construction period is saved, the inner side of the inner ring support is not provided with a support structure, the earthwork unearthing space (earthwork is usually an important control procedure of the foundation pit progress) is increased to the maximum extent, and the construction efficiency is effectively improved; 3. the method is economical and reasonable, the partition wall can be eliminated when the transfer station is implemented at the same time, the staged implementation of the foundation pit is avoided, the chiseling process of the partition wall is optimized, the construction period can be greatly shortened, the engineering quantity of the partition wall can be optimized, and the construction cost is optimized; 4. the method has strong applicability, can be suitable for transfer nodes of transfer stations with various angles such as T-type, L-type and X-type, determines the outer ring support (polygon) R according to field conditions, determines the diameter R of the inner ring support according to rigidity requirements and main structure column net distribution, determines the ring beam number X of the inner ring support according to vertical stress requirements, and forms the standardized design of double-line or multi-line transfer large node support through the parameters.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic diagram of an intersection structure of two rail transit lines at a transfer station in the prior art;
fig. 2 is a schematic diagram of a supporting system when two track traffic lines adopt pit separation to construct the supporting system at a transfer station in the prior art.
In fig. 1 and 2, reference numerals are explained as follows:
the track traffic line a, a foundation pit b, a partition wall c and a bracing system d.
Fig. 3 is a schematic diagram of a support system at a transfer node of an urban rail transit transfer station according to an embodiment of the invention.
In fig. 3, the reference numerals are explained as follows:
the structure comprises an outer ring support 1, an outer ring support structural member 11, an outer ring support auxiliary member 12, an inner ring support 2, an inner ring and outer ring connecting member 3, a circumferential support main beam 31, a truss secondary beam 32, a plate support 4 and a main structural column 5.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The scale of urban underground engineering is rapidly expanded and connected into a net, so that in order to avoid influences on ground environment and traffic, underground excavation tunnel engineering is increasingly used as a main construction method of urban underground engineering, the key problems to be solved by the underground excavation engineering are that the safety of the underground excavation construction is ensured, and the influence of the underground excavation engineering on surrounding building structures is reduced.
Referring to fig. 3, fig. 3 is a schematic diagram of a supporting system at a transfer node of an urban rail transit transfer station according to an embodiment of the present invention.
The invention provides a construction method of a support system at transfer nodes of an urban rail transit transfer station, which comprises the following steps:
the method comprises the following steps of firstly, performing preposition operation, obtaining a centroid of a virtual shape formed by crossing of rail transit lines, and taking the centroid as a stress circle center of an outer ring support 1;
the method comprises the following steps of pre-operation II, determining the type of the outer ring support 1 according to stratum characteristics, determining the construction range of the outer ring support 1 according to the distance of a building around a foundation pit and a pipeline moving and modifying space, wherein the determination of the construction range is required to meet the condition that the peripheral building and the pipeline moving and modifying space cannot be affected in the actual construction operation process;
step one, arranging a circular or polygonal outer ring support 1, and connecting the outer ring support 1 with a rail transit line for eliminating an internal corner structure;
step two, arranging an inner ring support 2 of a ring beam structure to replace a support system so as to improve the overall rigidity of the support system;
and step three, arranging an inner ring connecting member 3 and an outer ring connecting member 3 for realizing the connection of the outer ring support 1 and the inner ring support 2.
And step four, arranging a waist beam and a crown beam for improving the rigidity of the protection and support system for the foundation pit.
In the second preposed operation, the type of the outer ring support 1 is determined according to the stratum characteristics and the depth of the foundation pit, the type of the outer ring support 1 generally comprises various support types such as a continuous wall support, a drilled pile support, an occluded pile support and the like, and the continuous wall support type is adopted for the conditions of abundant underground water and deep foundation pit. In addition, according to the field construction environment and the use requirement, when a continuous wall support type is adopted, the continuous wall can be a complete annular wall structure, and also can be a multi-section arc wall arranged between rail transit lines, and when the multi-section arc wall is adopted, all the arc walls are positioned in the same virtual circular ring.
In the invention: when the outer ring support 1 adopts a cast-in-place pile, the outer ring support 1 can adopt a circular ring structure; when the outer ring support 1 adopts a continuous wall, the outer ring support 1 preferably adopts a polygonal structure, and the reason is that the continuous wall adopts a linear type construction, so that the construction is convenient and feasible; when the outer ring supports 1 and adopts the steel reinforcement cage, the steel reinforcement cage is of a linear structure, and therefore the outer ring supports 1 and also preferentially adopts a polygonal structure.
The invention mainly aims at a supporting system implemented at the nodes of a transfer station of a plurality of rail transit lines.
In the first preposition operation, the track traffic lines can be virtualized into two parallel lines (generally, straight lines are arranged at a transfer station), then, a plurality of track traffic lines can be intersected at the nodes of the transfer station, two adjacent virtual lines are intersected to form an intersection point, all the intersection points are sequentially connected to form a closed graph, and after the centroid of the closed graph is determined, the centroid is used as the stress circle center of the outer ring support 1 and the inner ring support 2 in the later period.
The stressed circle center in the invention specifically refers to: when the outer ring support 1 is subjected to the pressure of the foundation pit rock soil, the pressure is focused.
In general, the outer ring support 1 of the present invention preferably has a polygonal or circular structure, so that the center of the force-bearing circle can be understood as the centroid of the outer ring support 1. The stress circle center of the outer ring support 1 is determined, and the stress of each point of the outer ring support is basically consistent, so that the stability of the structure of the outer ring support 1 is ensured, and the problem of structural damage caused by overlarge local stress of the outer ring support 1 is solved.
In a specific embodiment of the invention, two track traffic lines are provided, and a certain included angle is formed between the two track traffic lines, and the included angle is 72 °, then according to the above method, a virtual figure formed by the intersection of the two track traffic lines is a rhombus, and then the centroid of the rhombus is determined as the stress circle center of the outer ring support 1.
In the second pre-operation, before the second pre-operation, technicians can explore the geology of the construction site and determine the type of the outer ring support 1 according to specific stratum characteristics, so that targeted construction is realized, and the smooth construction of the outer ring support 1 and the reliability of the outer ring support after construction can be ensured to the greatest extent.
The method comprises the following steps of excavating a foundation pit according to the actual design size of a transfer station, wherein existing building structures and buried pipelines exist around the foundation pit, and then determining the construction range of the outer ring support 1 according to the distance of the building structures around the foundation pit and the pipeline moving and modifying space so as to meet the space requirement of pipeline moving and modifying and not to cause construction influence on the surrounding building structures.
In the first step, the shape of the outer ring support 1 is determined according to the excavation condition of the foundation pit and the condition of surrounding building structures, and the outer ring support is generally circular or polygonal. The outer ring support 1 has a function of being connected with the rail transit lines, the outer ring support 1 is connected with each rail transit line at the transfer node of the urban rail transit transfer station, the internal corner of the structure can be eliminated, and at the moment, the distance between the outer ring support and the centroid is larger than the distance between the intersection point and the centroid of each rail transit line.
Because the shape of the outer ring support can be designed before construction, when the outer ring support is designed in a polygonal structure, the side edge of the outer ring support 1 can be designed to be perpendicular to the center line of the rail traffic line, so that the included angle between the outer ring support 1 and the rail traffic line is 90 degrees, and no internal corner structure exists.
The outer ring support 1 is further optimized, so that the vertex angle of the outer ring support 1 is located between two virtual lines of the track traffic line, the included angle between the side wall of the outer ring support 1 and the track traffic line is always larger than 90 degrees, and a reentrant corner structure does not exist.
When the outer ring support 1 is designed to be of a circular structure, the center line of the track traffic line penetrates through the circle center of the outer ring support 1, so that the minimum included angle between the outer ring support 1 and the track traffic line is 90 degrees, and no internal corner structure exists.
In the second step, the inner ring support 2 is arranged in the outer ring support 1, the inner ring support 2 adopts a ring beam structure design, the circle center of the inner ring support 2 is concentric with the centroid of the outer ring support 1, and the inner ring support 2 is arranged to have the following functions: and the inner ring support 2 is rigidly connected with the outer ring support 1, so that the structural rigidity of the whole support system is increased.
In the present invention, the outer ring support 1 and the inner ring support 2 are both ring supports of a concrete structure (reinforced concrete structure).
In the third step, the inner and outer ring connecting members 3 are arranged for realizing the connection between the outer ring support 1 and the inner ring support 2, and preferably, the inner ring support 2 and the outer ring support 1 are connected by adopting a truss structure.
In the fourth step, the invention is also provided with a waist beam and a crown beam which are used for improving the rigidity of the protection and support system for the foundation pit.
In other embodiments, the outer ring support 1 may be divided into two parts, one being an outer ring support structural member 11 such as a retaining wall and a foundation pile, and the other being an outer ring support auxiliary member 12 such as a wale and a crown beam.
The wale is a transverse beam used on the retaining wall (outer ring support 1), is arranged at the middle height of the retaining wall, and can fix one end of an inclined strut for supporting the retaining wall on the wale, so that the support of the inclined strut on the retaining wall is changed from one point to one line, and the stability of the retaining wall is improved. Crown beam is for setting up the reinforced concrete continuous beam at foundation ditch peripheral support (outer loop is strutted 1) structure (mostly be stake and wall) top, and one of its effect is linked together all supporting construction (if the bored concrete pile, dig bored concrete pile soon etc.), prevents that foundation ditch (shaft) top edge from producing and collapsing, and increases supporting construction's wholeness.
In the invention, the waist beam and the crown beam are both structural components of the outer ring support 1, and the function of the waist beam and the crown beam is to improve the structural strength of the outer ring support 1.
The support system for the transfer nodes of the urban rail transit transfer station is used for transfer stations with various angles such as T-shaped, L-shaped and X-shaped. According to the invention, the supporting system adopts a multi-ring supporting structure system, the inner ring supporting adopts a ring beam structure design, the inner ring connecting member and the outer ring connecting member adopt a side truss supporting stress system, the inner ring supporting and the inner ring connecting member can replace the traditional opposite supporting system (the number of ring beams is vertically set according to calculation, and the inner ring supporting and the outer ring connecting member are vertically supported through lattice columns), the outer ring supporting and the peripheral control boundary condition and the large space effect of the transfer node are combined to properly expand the outer contour, so that the outer side supporting wall forms a circular or polygonal system, the internal corner can be cancelled, and the space of a transfer hall can be increased.
The above-mentioned peripheral control boundary conditions generally refer to: the distance requirements of peripheral buildings and pipeline moving and reforming spaces on construction and the like.
The construction method of the supporting system is optimized, so that the supporting system is stressed reasonably, and the invention makes full use of the compression resistance of concrete and converts the outside soil-water pressure of the supporting system into the compression bearing capacity of the supporting member. The supporting system has large integral rigidity and good deformation control effect, and can greatly improve the construction efficiency. The inner ring support is a large ring beam support, and no support member is arranged on the inner side of the inner ring support, so that the unearthing space is increased to the maximum extent. The implementation of the invention is more reasonable economically, and the implementation of the invention can cancel the division wall, simplify the construction process and reduce the construction cost.
The implementation of the invention only needs to determine the maximum radius (R) of the outer ring support according to the surrounding environment, determine the maximum radius (R) of the inner ring support according to the rigidity requirement, arrange the connecting member between the double rings, determine the vertical ring number (x) of the inner ring support according to the vertical calculation, and complete a whole set of design scheme through the parameters to form the standardized design of the transfer hall of the double-line or multi-line transfer station. According to the invention, a two-line or multi-line transfer large-node support standardized design is formed through R, R and x parameters, the design efficiency is improved, the foundation pit deformation control effect is good through field example monitoring, and the transfer node deformation can meet the first-level environment protection level of the foundation pit.
The advantages of the construction method of the support system provided by the invention are summarized as follows: 1. the multi-ring stress system has reasonable structural layout, the supporting system has large integral rigidity and good deformation control effect, and the compressive property of concrete is fully utilized to convert the soil-water pressure outside the supporting structure into the compressive bearing capacity of the supporting member; 2. the construction efficiency is high, the construction period is saved, the inner side of the inner ring support is not provided with a support structure, the earthwork unearthing space (earthwork is usually an important control procedure of the foundation pit progress) is increased to the maximum extent, and the construction efficiency is effectively improved; 3. the method is economical and reasonable, the partition wall can be eliminated when the transfer station is implemented at the same time, the staged implementation of the foundation pit is avoided, the chiseling process of the partition wall is optimized, the construction period can be greatly shortened, the engineering quantity of the partition wall can be optimized, and the construction cost is optimized; 4. the method has the advantages that the applicability is high, the method is applicable to transfer nodes of transfer stations with various angles such as T-type, L-type and X-type, the outer ring support (polygon) R is determined according to field conditions, the radius R of the inner ring support is determined according to the rigidity requirement of the outer ring support and the distribution of structural columns in a main structure column net, the number X of ring beams of the inner ring support is determined according to the vertical stress requirement of the outer ring support, and the standardized design of the double-line or multi-line transfer large-node support is formed through the parameters.
The invention also provides a supporting system for the transfer nodes of the urban rail transit transfer station, which comprises the following components:
first part, outer ring support 1
The outer ring support 1 is a peripheral support component of the support system of the present invention, and is disposed within the foundation pit and adjacent to the inner wall of the foundation pit. The outer ring support 1 is of a polygonal structure or a circular structure and is arranged at the junction of the rail transit lines.
In the invention, the stressed circle center of the outer ring support 1 is concentric with the centroid of a virtual shape formed by the intersection of the rail traffic lines.
Second part, inner ring support 2
The inner ring support 2 is arranged inside the outer ring support part, the inner ring support 2 and the outer ring support 1 are arranged concentrically, and the inner ring support 2 is a large ring beam inner ring support and is used for replacing a support system to improve the overall rigidity of the support system.
For a deeper foundation pit, for example, a station is changed into an underground multi-layer structure, a plurality of inner ring supports 2 (the inner ring supports 2 adopt large ring beams, and the height of the beams is smaller) are required to be arranged in the height direction, so that the overall rigidity of the support system is improved.
Third part, inner and outer ring connecting member 3
The inner and outer ring connecting members 3 are arranged between the outer ring support 1 and the inner ring support 2 and connected with the outer ring support 1 and the inner ring support 2, and are used for realizing the connection of the outer ring support 1 and the inner ring support 2.
Specifically, the inner and outer ring connecting members 3 are a side truss system.
When the inner ring supports 2 are provided with a plurality of channels, an inner ring connecting member 3 and an outer ring connecting member 3 are arranged between each inner ring support 2 and each outer ring support 1. Preferably, the number of the inner ring supports 2 is the same as the number of the wale and the crown beam, in other words, the number of the inner ring supports 2 is the same as the number of the outer ring support auxiliary member, which is advantageous for further enhancing the rigidity.
The inner and outer ring connecting members 3 can be divided into two parts, namely, a main ring supporting beam 31 and a secondary truss beam 32, wherein the center line of the main ring supporting beam 31 penetrates through the circle center of the inner ring support 2 and is arranged around the circle center of the inner ring support 2 at equal intervals, and the secondary truss beam 32 is arranged between the two adjacent main ring supporting beams 31 as an inclined support.
Fourth part, plate support 4
In the invention, the plate support 4 is arranged at the position required by force transmission at the outer side of the outer ring support 1 and is used for improving the structural strength of the connection part of the support system and the rail transit line.
When the outer ring support 1 adopts a complete annular continuous wall support structure, the track traffic line and the outer side surface of the outer ring support 1 have a joint structure, and the force transmission required part specifically refers to: the rail transit line and the outer ring support 1 are separated from each other before connection and do not contact until the rail transit line is connected with the outer ring support 1, the actual contact area between the rail transit line and the outer ring support 1 is small, the strength of the connection structure is low, a force transmission structure needs to be arranged in a part of space before the rail transit line is connected with the outer ring support 1, and the part of structure is a part needing force transmission.
Referring to fig. 1, it is shown in fig. 1 that two rail transit lines intersect to form a rhombus, the centroid of the rhombus is taken as the center of the outer ring stressed circle, the outer contour shape (which may be circular or polygonal) of the outer ring support is determined according to the surrounding environment and the controlled boundary conditions, and the outer ring support structural member 11 is retracted inwards by a certain distance (generally 4-8 m, the required rigidity is determined by combining with plane calculation and column net determination) to avoid the main structural column 5. After the inner ring support 2 is arranged, the inner ring connecting member 3 and the outer ring connecting member 3 are unfolded according to a certain angle according to the stress circle center of the outer ring support 1 (the angle and the rigidity required by the calculation of the main beam distance combination plane are determined), and the integrity between the inner ring and the outer ring is ensured by arranging the inner ring connecting member 3 and the outer ring connecting member 3. The local force transmission part can be provided with a plate support 4. The vertical height of the outer ring supporting structure member 11 and the number of vertical tracks supported are determined by checking calculation according to the safety level of the foundation pit and the stability and the ultimate strength of the supporting structure, the vertical member supports and transmits force through the lattice column, and a pavement paving plate can be arranged on the ground as required.
One embodiment of the present invention is as follows: the two rail transit lines are intersected, the intersection angle is 72 degrees, and a rhombic center formed by the intersection of the two lines is taken as the stress circle center of the outer ring; and selecting the underground continuous wall as a supporting structure according to stratum characteristics, determining the distance from the outer ring supporting structure member 11 to the stress circle center of the outer ring to be 26.5m according to the distance of buildings around the foundation pit and the pipeline migration and reconstruction space, and adopting a polygonal outline for the outer ring support 1. Avoiding the main structural column 5, determining the radius of the inner ring support 2 to be 19.5m according to the plane rigidity calculation, and the distance from the inner ring support 2 to the outer ring support structural member 11 to be about 7 m. According to the stress circle center of the outer ring support, the annular support main beam 31 is uniformly unfolded at 15 degrees, and the truss secondary beam 32 is arranged to enable the inner ring support and the outer ring support to form a stress whole. The plate support 4 is partially arranged. The vertical length of the three-layer foundation pit is 48 meters after the enclosure wall is calculated according to the stability and the strength of the member, three ring beam supports (inner ring supports 2) are vertically arranged on the negative one layer and the negative two layer, and lattice columns are vertically arranged between the inner ring supports 2. The pavement is provided with a paving plate as required, the size of the component is determined according to the safety level and the environment level of the foundation pit, and the reinforcement is determined according to the bearing capacity.
In practical application of the invention, two temporary partition walls can be eliminated, the construction and chiseling of the partition walls can be considered, the manufacturing cost can be saved by about 180 ten thousand yuan, the concrete support is increased by about 925 thousand according to the estimation of an example, the steel support is reduced by 1036 thousand, the support is reduced by about 111 thousand, and the total is reduced by 291 thousand yuan. By integrating the foundation pit (the integration of the external expansion section and the main body section of the transfer node), the stage disadvantage is omitted, the unearthing efficiency factor is considered, and compared with a common foundation pit supporting mode, the civil engineering construction period can be saved by about 10-12 months.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A construction method of a supporting system at a transfer node of an urban rail transit transfer station is characterized by comprising the following steps:
step one, arranging a circular or polygonal outer ring support, and connecting a rail transit line for transfer at a transfer node of an urban rail transit transfer station through the outer ring support to eliminate an internal corner structure;
step two, arranging an inner ring support of a ring beam structure, and improving the overall rigidity of a support system;
and step three, arranging an inner ring connecting member and an outer ring connecting member for realizing the connection of the outer ring support and the inner ring support.
2. The construction method of the supporting system at the transfer node of the urban rail transit transfer station according to claim 1, further comprising:
the method comprises the steps of firstly, prepositioning operation, obtaining a centroid of a virtual shape formed by rail transit line intersection, and taking the centroid as a stressed circle center of the outer ring support and the inner ring support.
3. The construction method of the supporting system at the transfer node of the urban rail transit transfer station according to claim 2, further comprising:
and secondly, performing pre-operation, determining the type of the outer ring support according to stratum characteristics, and determining the construction range of the outer ring support according to the distance of buildings around the foundation pit and the pipeline moving and modifying space.
4. The construction method of the supporting system at the transfer node of the urban rail transit transfer station according to any one of claims 1 to 3, further comprising:
and step four, arranging a waist beam and a crown beam for improving the protection of the foundation pit and improving the rigidity of the supporting system.
5. The utility model provides a supporting system at urban rail transit transfer station transfer node which characterized in that includes:
the outer ring support (1) is a circular or polygonal annular support and is used for being arranged at the junction of a plurality of rail transit lines;
the inner ring support (2) and the outer ring support are arranged concentrically, and the inner ring support is a large ring beam inner ring support and is used for replacing a support system to improve the overall rigidity of the support system;
and the inner ring and outer ring connecting members (3) are arranged between the outer ring support and the inner ring support, are connected with the outer ring support and the inner ring support, and are used for realizing the connection of the outer ring support and the inner ring support.
6. The urban rail transit transfer station transfer node support system according to claim 5,
the stressed circle center of the outer ring support is concentric with the centroid of a virtual shape formed by the intersection of the track traffic lines.
7. The urban rail transit transfer station transfer node support system according to claim 5,
the inner and outer ring connecting members are side truss systems.
8. The support system at a transfer node of an urban rail transit transfer station according to claim 5, further comprising:
and the plate support (4) is arranged at the position required for force transmission outside the outer ring support.
9. The support system at a transfer node of an urban rail transit transfer station according to any one of claims 5 to 8, further comprising:
the inner ring is strutted and is provided with the multichannel on the direction of height, adjacent twice be provided with the lattice column between the inner ring is strutted.
10. The urban rail transit transfer station transfer node support system according to claim 9,
and the inner ring and the outer ring connecting members are arranged between the inner ring support and the outer ring support.
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