CN116025005B - Subway station main body structure construction method influenced by double rows of lattice columns - Google Patents
Subway station main body structure construction method influenced by double rows of lattice columns Download PDFInfo
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- CN116025005B CN116025005B CN202310011679.3A CN202310011679A CN116025005B CN 116025005 B CN116025005 B CN 116025005B CN 202310011679 A CN202310011679 A CN 202310011679A CN 116025005 B CN116025005 B CN 116025005B
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Abstract
The invention discloses a construction method of a subway station main body structure influenced by double rows of lattice columns, which comprises the following steps: step 1: dividing the construction section: simulating to obtain an optimal construction section value N of the foundation pit without deformation of the side wall when the first concrete support and the steel lattice column are removed simultaneously after the construction of the negative side wall is completed; step 2: constructing a bottom plate; step 3: and (3) middle plate construction: carrying out third steel support dismantling according to the optimal construction flow section, laying a side wall waterproof layer after each section of dismantling is completed, and constructing a side wall, a column and a middle plate of the structure; step 4: and (3) constructing a negative one-layer side wall and a column: dismantling a second steel support according to the construction step in the step 3, laying a side wall waterproof layer, and constructing a structural side wall and a column; step 5: and (3) roof construction: and removing the first concrete support and the steel lattice column, and pouring the structural top plate. The structural roof has guaranteed the wholeness, reduces the waterproof measure, eliminates later stage percolating water hidden danger.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a construction method of a main body structure of a subway station, which is influenced by double rows of lattice columns.
Background
Referring to fig. 1 and 2, a certain subway station is constructed, a station and a shield receiving and starting well are combined into a foundation pit construction in consideration of a construction method and a construction period, the foundation pit of the station is constructed by adopting an open cut method, a support system adopts a mode of drilling cast-in-place piles and internal supports, three internal supports are vertically arranged, a reinforced concrete support is adopted in a first internal support, steel supports are adopted in a second internal support and a third internal support, two concrete connecting beams 2 are arranged in the middle of the foundation pit and are connected with the first concrete support 1, two steel lattice columns 3 are vertically arranged at nodes of the connecting beams and the first concrete support, and the drilling cast-in-place piles are arranged below the steel lattice columns.
The existing main structure construction method is that after the construction of the structural middle plate 7 and the structural top plate 9 is completed, the steel lattice columns and the bottom plate 4 and the intersecting nodes of the middle plate and the top plate are cut and removed, however, when the station main structure is constructed, the number of the steel lattice columns is large, if the construction method is adopted, the following steps are adopted: cutting the steel lattice column after the top plate of the main structure is completed, forming dozens of holes in the top plate structure of the station, increasing the waterproof working procedure and construction difficulty of the top plate, and causing poor integrity of the top plate, and causing hidden danger of water leakage at the position where the steel lattice column passes through the top plate in the later stage; meanwhile, when the steel lattice columns of the second layer and the first layer are cut after the construction of the top plate is completed, multiple reinforcement stabilizing measures are needed to be made on the steel lattice columns before cutting, and the root and the top of the steel lattice columns are prevented from suddenly lodging after cutting and breaking with a main structure, so that potential safety hazards exist.
In addition, because the upper and lower cutting space of the steel lattice columns between the negative two layers and the negative one layer is limited, the large hoisting equipment cannot be matched with manual work to cut, the steel lattice columns between the two layers are required to be cut in a layered and segmented mode, the cutting procedure and the number of each steel lattice column are relatively large, labor and time are wasted, the efficiency is low, and the construction difficulty and the construction period are increased.
Disclosure of Invention
The invention provides a construction method of a main structure of a subway station, which is influenced by double rows of lattice columns, guarantees the integrity of a structural top plate, reduces waterproof measures, eliminates hidden danger of later-stage water leakage, can hoist out the whole steel lattice columns, reduces a plurality of reinforcing stabilizing measures and the number of single cutting before cutting the steel lattice columns, and improves the construction efficiency.
The technical problems to be solved are as follows: the construction of the existing structural top plate can form dozens of holes in the top plate, the waterproof working procedure and construction difficulty of the top plate are increased, and because the upper and lower cutting spaces of the steel lattice columns between the negative two layers and the negative one layer are limited, the large hoisting equipment cannot be matched with manual work for cutting, the steel lattice columns between the two layers are required to be cut in a layered and segmented mode, the cutting working procedure and the number of each steel lattice column are relatively large, the labor and time consumption are low, and the construction difficulty and the construction period are increased.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a construction method of a subway station main body structure influenced by double rows of lattice columns, which comprises the following steps:
step 1: dividing the construction section: after the construction of the negative one-layer side wall is completed, simulating a value N1 of the safest construction section of the foundation pit with no deformation of the side wall when the first concrete support and the steel lattice column are removed simultaneously, namely, ground dynamic load and soil pressure are less than or equal to the horizontal compressive strength of the cantilever member, wherein the horizontal compressive strength = negative one-layer height H is multiplied by the length N1 of the construction section, and obtaining a value of N1; dividing the construction section number N2 by combining the waterproof requirement, deformation joint setting and column net factors, and obtaining the optimal construction running water section Min (N1, N2) according to N1 and N2;
step 2: and (3) constructing a bottom plate: excavating to a substrate, applying a concrete cushion layer, a bottom plate waterproof layer and a protective layer, and pouring a structural bottom plate and a guide wall;
step 3: and (3) middle plate construction: when the structural strength of the construction in the step 2 reaches 75% of the design strength, carrying out third steel support dismantling according to the optimal construction running water section, laying a side wall waterproof layer after each section of dismantling is completed, and constructing a structural side wall, a column and a middle plate;
step 4: and (3) constructing a negative one-layer side wall and a column: when the structural strength of the construction in the step 3 reaches 75% of the design strength, dismantling a second steel support according to the construction step in the step 3, laying a side wall waterproof layer, and constructing a structural side wall and a column;
step 5: and (3) roof construction: and (3) when the structural strength applied in the step (4) reaches the design strength, removing the first concrete support and the steel lattice column, pouring the structural top plate, laying a top plate waterproof layer, and backfilling the earthwork above the top plate to the design elevation.
The invention relates to a construction method of a main structure of a subway station influenced by double rows of lattice columns, and further, the simulated working condition in the step 1 needs to consider that no concentrated pile load exists in a range of 5m on two sides of the ground of a foundation pit, and the part of vehicle dynamic load needs to be considered when the ground temporary road is outside a range of 3 m.
The invention relates to a construction method of a subway station main body structure influenced by double rows of lattice columns, which further comprises the following steps of waterproof requirements, deformation joint arrangement and column net factors in step 1:
(1) dividing the construction section to avoid the waterproof weak position;
(2) dividing and utilizing the construction section to design deformation joints;
(3) and avoiding the positions of the frame columns according to the designed column spacing size.
The invention relates to a construction method of a main body structure of a subway station, which is influenced by double rows of lattice columns.
The invention relates to a construction method of a main body structure of a subway station, which is influenced by double rows of lattice columns, and the hollow of a side wall below a negative layer is filled compactly before a first concrete support and the lattice columns are removed.
The invention relates to a construction method of a subway station main structure influenced by double rows of lattice columns, and further comprises construction monitoring during construction of the main structure, wherein the construction monitoring comprises pre-buried strain gauge on a negative side wall, foundation pit surface subsidence monitoring in a construction section, and pile top and pile body displacement monitoring of a fender pile.
The invention relates to a construction method of a main structure of a subway station influenced by double rows of lattice columns, which is characterized in that before a first concrete support is dismantled, a full-red plate buckling frame and a frame column hoop are arranged on a negative layer and are tightly pressed with a side wall horizontal plane.
The invention relates to a construction method of a main body structure of a subway station influenced by double rows of lattice columns, which is characterized in that a water stop steel plate is arranged at the middle part of the intersection of a steel lattice column and a bottom plate, and water stop glue is arranged between the top surface of the water stop steel plate and the steel lattice column.
The invention relates to a construction method of a subway station main body structure influenced by double rows of lattice columns, which is characterized in that a layer of cement-based permeable crystallization type waterproof coating is arranged on the top surface of a cast-in-place pile, and sealant is arranged at the joint of a waterproof layer of a bottom plate and steel lattice columns.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the method, after the construction of the negative side wall of the station main body structure is completed, the first concrete support and the steel lattice column are removed in time, the station top plate is integrally poured, holes are not reserved, waterproof measures are reduced, and the hidden danger of later water leakage is eliminated; meanwhile, before the construction of the top plate of the main body structure of the station, the first concrete support and the steel lattice column are dismantled, the space is not affected, the large hoisting equipment can be matched with manual cutting, and only the root part of the steel lattice column intersected with the bottom plate and the top part intersected with the first concrete support are required to be disconnected, so that the whole steel lattice column is hoisted out, a plurality of reinforcing and stabilizing measures and the number of single cutting before the steel lattice column is cut are reduced, and the construction efficiency is improved;
2. the optimal running water construction section is calculated and simulated, so that the space-time effect on the foundation pit caused by dismantling the first concrete support and the steel lattice column before the top plate is not constructed is avoided, the collapse of the foundation pit is prevented, and the stability of the foundation pit is ensured.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic plan view of the background art of the invention;
FIG. 2 is a schematic diagram of a background art elevation of the present invention;
FIG. 3 is a schematic illustration of the stress at the construction site of the present invention;
FIG. 4 is a schematic view of the construction structure of the base plate of the present invention;
FIG. 5 is a schematic view of a third steel support removal according to the present invention;
FIG. 6 is a schematic view of a second steel support removal of the present invention;
FIG. 7 is a schematic view of a first concrete support removal of the present invention;
FIG. 8 is a schematic view of a roof construction structure according to the present invention;
fig. 9 is a graph of the waterproof nodes of the steel lattice column and the bottom plate of the present invention.
Reference numerals:
1. a first concrete support; 2. a contact beam; 3. steel lattice columns; 4. a bottom plate; 5. a third steel support; 6. a side wall; 7. a middle plate; 8. a second steel support; 9. a top plate; 10. a water-stopping steel plate; 11. water stop glue; 12. waterproof paint; 13. and (5) sealing glue.
Detailed Description
Referring to fig. 1 to 9, the method for constructing the main structure of the subway station, which is affected by double rows of lattice columns, comprises the following steps:
step 1: dividing the construction section: in order to solve the space-time effect on the foundation pit caused by dismantling the first concrete support 1 and the steel lattice column 3 before the construction of the top plate 9 of the main body structure of the station, prevent the collapse of the foundation pit, calculate and simulate the optimal running water construction section, determine the number of dismantling the first concrete support 1 and the steel lattice column 3 at most once, and the specific method is as follows:
(1) The simulated working condition needs to consider that no concentrated pile load exists in the range of 5m on the two sides of the foundation pit ground, and partial vehicle dynamic load needs to be considered when the range of 3m is a temporary road of the ground.
(2) After the construction of the negative one-layer side wall 6 is completed, the stability of the foundation pit when the first concrete support 1 and the steel lattice column 3 are removed simultaneously and the value N1 of the safest construction section without deformation of the side wall 6 are obtained through simulation.
(3) The construction section number N2 is reasonably divided by combining the factors of waterproof requirement, deformation joint arrangement, column net and the like, wherein the factors are specifically that (1) the division of the construction section preferably avoids the waterproof weak position, such as a dry well, a wall penetrating pipe and the like; (2) the division of the construction section utilizes design deformation joints as much as possible; (3) and avoiding the positions of the frame columns according to the designed column spacing size.
(4) And taking the best construction running water sections Min (N1 and N2) according to the obtained construction section number.
Step 2: and (3) constructing a bottom plate: and excavating to a substrate, applying a concrete cushion layer, a waterproof layer and a protective layer of the bottom plate 4, and pouring the bottom plate 4 and the guide wall of the structure.
Step 3: and (3) middle plate construction: and when the structural strength of the second lining applied in the last step reaches 75% of the design strength, dismantling the third steel support 5 according to the optimal construction flow section, laying a waterproof layer of the side wall 6 after each section is dismantled, and applying the waterproof layer to the side wall 6, the column, the middle plate 7 and the rail top air duct of the structure.
Step 4: and (3) constructing a negative one-layer side wall and a column: and (3) when the structural strength of the second lining applied in the previous step reaches 75% of the design strength, dismantling the second steel support 8 according to the construction step of the step (3), laying a waterproof layer of the side wall 6, and applying the side wall 6 and the column of the structure.
Step 5: and (3) roof construction: and when the strength of the two-lining structure applied in the previous step reaches 100% of the design strength, dismantling the first concrete support 1 and the steel lattice column 3 according to the construction step of the step 3, pouring the structural top plate 9, laying a top plate 9 waterproof layer, and backfilling earthwork above the top plate 9 to the design elevation. Wherein, the top plate 9 of the corresponding flowing water section can be constructed after the corresponding construction flowing water section of each section of middle plate 7 reaches the design strength.
The construction monitoring comprises the following steps of pre-buried strain gauge on the negative side wall, monitoring the subsidence of the foundation pit surface in the construction section, and monitoring the displacement of the pile top and the pile body of the guard pile.
Before the first concrete support 1 is dismantled, a full-framing plate buckling frame and a frame column hoop are arranged on the negative layer and are tightly pressed against the side wall 6, so that the side wall of the foundation pit is stable when the top plate 9 is applied after the first concrete support 1 is dismantled.
The middle part of the steel lattice column 3 intersecting with the bottom plate 4 is welded with a water stop steel plate 10, a water stop glue 11 is arranged between the top surface of the water stop steel plate 10 and the steel lattice column 3, a layer of cement-based permeable crystallization type waterproof coating 12 is arranged on the top surface of the cast-in-place pile, and a sealant 13 is arranged at the intersection of the waterproof layer of the bottom plate 4 and the steel lattice column 3, so that the waterproof effect of the intersection of the bottom plate 4 and the lattice column is ensured.
According to the method, after the construction of the negative side wall 6 of the station main body structure is completed, the first concrete support 1 and the steel lattice column 3 are removed in time, the station top plate 9 is integrally poured, holes are not reserved, waterproof measures are reduced, and the hidden danger of later-stage water leakage is eliminated; meanwhile, before the construction of the top plate 9 of the main body structure of the station, the first concrete support 1 and the steel lattice column 3 are removed, the space is not affected, the large hoisting equipment can be matched with manual cutting, and only the root part of the steel lattice column 3 intersected with the bottom plate 4 and the top part intersected with the first concrete support 1 are required to be disconnected, so that the whole steel lattice column 3 is hoisted out, a plurality of reinforcing and stabilizing measures and the number of single cutting before the steel lattice column 3 is cut are reduced, and the construction efficiency is improved.
In addition, the optimal running water construction section is calculated and simulated, so that the space-time effect on the foundation pit caused by dismantling the first concrete support 1 and the steel lattice column 3 before the top plate 9 is not constructed is avoided, the collapse of the foundation pit is prevented, and the stability of the foundation pit is ensured.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The construction method of the subway station main body structure influenced by the double rows of lattice columns is characterized by comprising the following steps of:
step 1: dividing the construction section: after the construction of the negative one-layer side wall (6) is completed, simulating the value N1 of the safest construction section of the foundation pit when the first concrete support (1) and the steel lattice column (3) are removed at the same time, wherein the deformation of the side wall (6) is avoided, namely, the ground dynamic load and the soil pressure are less than or equal to the horizontal compressive strength of the negative one-layer side wall (6) serving as cantilever members, the horizontal compressive strength=the negative one-layer height H is multiplied by the construction section length N1, and the value of N1 is obtained; dividing the construction section number N2 by combining the waterproof requirement, deformation joint setting and column net factors, and obtaining the optimal construction running water section Min (N1, N2) according to N1 and N2;
step 2: and (3) constructing a bottom plate: digging to a substrate, applying a concrete cushion layer, a waterproof layer and a protective layer of a bottom plate (4), and pouring the bottom plate (4) and a guide wall of the structure;
step 3: and (3) middle plate construction: when the structural strength of the construction performed in the step 2 reaches 75% of the design strength, dismantling the third steel support (5) according to the optimal construction running water section, laying a waterproof layer of the side wall (6) after each section of dismantling is completed, and performing construction of the side wall (6), the column and the middle plate (7);
step 4: and (3) constructing a negative one-layer side wall and a column: when the structural strength of the construction in the step 3 reaches 75% of the design strength, dismantling the second steel support (8) according to the construction step in the step 3, laying a waterproof layer of the side wall (6), and constructing the side wall (6) and the column of the structure;
step 5: and (3) roof construction: and (3) when the structural strength applied in the step (4) reaches the design strength, removing the first concrete support (1) and the steel lattice column (3), pouring the structural top plate (9), laying a top plate (9) waterproof layer, and backfilling the earthwork above the top plate (9) to the design elevation.
2. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: the simulated working condition in the step 1 needs to consider that no concentrated pile load exists in the range of 5m on the two sides of the foundation pit ground, and partial vehicle dynamic load needs to be considered when the ground temporary road is outside the range of 3 m.
3. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: in the step 1, waterproof requirements, deformation joint setting and column net factors are as follows:
(1) dividing the construction section to avoid the waterproof weak position;
(2) dividing and utilizing the construction section to design deformation joints;
(3) and avoiding the positions of the frame columns according to the designed column spacing size.
4. A method for constructing a main structure of a subway station affected by double rows of lattice columns according to claim 3, wherein: the waterproof weak position is a drainage well or a wall penetrating pipe.
5. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: before the first concrete support (1) and the steel lattice column (3) are removed, the hollow of the lower side wall of the negative layer is filled compactly.
6. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: the main structure further comprises construction monitoring during construction, wherein the construction monitoring comprises monitoring of the surface subsidence of the foundation pit at the construction section by embedding strain gauges on the side wall of the negative layer, and monitoring of the pile top and the displacement of the pile body of the guard pile.
7. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: before the first concrete support (1) is dismantled, a full-framing plate buckling frame and a frame column hoop are arranged on the negative layer and are tightly pressed with the side wall (6) in a horizontal mode.
8. The subway station main body structure construction method influenced by double rows of lattice columns according to claim 1, wherein the construction method comprises the following steps: a water stop steel plate (10) is arranged at the middle part of the steel lattice column (3) intersecting with the bottom plate (4), and water stop glue (11) is arranged between the top surface of the water stop steel plate (10) and the steel lattice column (3).
9. The construction method of the subway station main structure influenced by the double-row lattice columns, which is disclosed by claim 8, is characterized in that: a layer of cement-based permeable crystallization waterproof paint (12) is arranged on the top surface of the filling pile, and a sealant (13) is arranged at the joint of the waterproof layer of the bottom plate (4) and the steel lattice column (3).
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