Subway station roof staged pouring construction method

Abstract

The invention relates to the technical field of underground engineering, in particular to a subway station roof staged pouring construction method which comprises the following steps: constructing a pre-poured roof and a post-poured roof; the connection position of the pre-cast top plate and the post-cast top plate is processed to be in a special tongue-and-groove form, namely a mutual meshing form, so that the connectivity and integrity of the integral structure cast by stages are improved, and leakage through seams and leakage points are prevented from being formed in the connection position.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and in particular to a staged pouring construction method for a subway station roof. Background Art

[0002] In subway structure design, when the road red line of the station is narrow, full open-cut construction will have a serious impact on traffic and cannot meet the requirements of traffic relief. Therefore, it is necessary to adopt the semi-covered excavation method. The semi-covered excavation method is to divide the foundation pit under the main road into two parts, first excavate the earth on one side, and then cover it with reinforced concrete cover for vehicles to pass, and then excavate the other side to form a "half open and half covered" working surface. The top plate constructed first can meet the needs of traffic relief. After the main body is constructed from the open-cut side to the top plate elevation, the top plate is completely closed, that is, the phased casting method is adopted.

[0003] At present, the staged pouring usually reserves a steel bar connector in the top plate of the first pouring part, sets a water stop steel plate at the junction of the two top plates, and treats the junction edge as a flat tongue and groove. Through the mutual engagement of the tongue and groove, the connectivity and integrity of the staged pouring structure are increased, and the two parts of the top plate are made closer at the connection part, thereby enhancing the anti-seepage performance of the joint. However, since the junction part is treated as a unified boundary, a structural through seam is formed, which aggravates the split of the two top plates of the staged pouring, and then often leads to the formation of leakage through seams here, forming a seepage point. Summary of the invention

[0004] The purpose of the present application is to provide a method for staged pouring construction of a subway station roof slab, by processing the junction edges of two roof slabs into a special tongue-and-groove form, thereby increasing the connectivity and integrity of the staged pouring structure and avoiding the formation of leakage seams at the junction to produce leakage points.

[0005] To achieve the above purpose, the present application adopts a subway station roof pouring construction method in stages, comprising:

[0006] Constructing a cast-in-place top plate; building a formwork assembly in a foundation pit, the formwork assembly comprising a side plate, a bottom plate and a raised portion, the bottom plate being built at the bottom of the foundation pit, and one side of the bottom plate along the width direction is connected to a first side wall of the foundation pit, a gap is left between the other side of the bottom plate along the width direction and the second side wall of the foundation pit, the first side wall and the second side wall are arranged opposite to each other, the side plate is located above the bottom plate, and the bottom side of the side plate is connected to the other side of the bottom plate along the width direction, the raised portion is arranged on a side of the side plate facing the first side wall, a first pouring space is defined between one side of the formwork assembly and the first side wall of the foundation pit, pouring is performed in the first pouring space to obtain the cast-in-place top plate;

[0007] Construct the post-cast top slab; remove the formwork assembly, and build a second bottom slab suspended in the gap between the other side of the bottom slab along the width direction and the second side wall of the foundation pit, and one side of the second bottom slab along the width direction is connected to the second side wall of the foundation pit, and the other side is connected to the bottom edge of the first-cast top slab, the second side wall of the foundation pit, the top of the second bottom slab and one side of the first-cast top slab define a second casting space, and secondary casting is performed in the second casting space to obtain the post-cast top slab.

[0008] As a preferred technical solution, it also includes arranging a first steel bar and a second steel bar;

[0009] The arranging of the first steel bar specifically includes: after the formwork assembly is built in the foundation pit, arranging the first steel bar at the upper part and the lower part of one side of the foundation pit, wherein one end of the first steel bar is connected to the first side wall of the foundation pit, and the other end is connected to one side of the formwork assembly;

[0010] The arranging of the second steel bar specifically includes: after the second base plate is built in the foundation pit, the second steel bar is arranged on the upper and lower parts of the other side of the foundation pit, one end of the second steel bar is connected to the second side wall of the foundation pit, and the other end is connected to the first steel bar.

[0011] As a preferred technical solution, a steel bar connector is installed at the other end of the first steel bar, and the first steel bar and the second steel bar are connected through the steel bar connector.

[0012] As a preferred technical solution, it also includes arranging a first additional steel bar and a second additional steel bar;

[0013] The arranging of the first additional reinforcement specifically includes: after the first reinforcement is arranged, arranging the first additional reinforcement along one side of the foundation pit, wherein one end of the first additional reinforcement is connected to the middle of the first side wall of the foundation pit, and the other end is connected to the middle of one side of the formwork assembly;

[0014] The arranging of the second additional steel bar specifically includes: after the second steel bar is arranged, arranging the second additional steel bar on the other side of the foundation pit, one end of the second additional steel bar is connected to the middle of the second side wall of the foundation pit, and the other end is connected to the first additional steel bar.

[0015] As a preferred technical solution, a steel bar connector is installed at the other end of the first additional steel bar, and the first additional steel bar is connected to the second additional steel bar through the steel bar connector.

[0016] As a preferred technical solution, a plurality of the protrusions are provided, and the plurality of the protrusions are arranged at intervals and staggered on a surface of the side plate facing the first side wall.

[0017] As a preferred technical solution, the height of the side panels is ≥750 mm.

[0018] As a preferred technical solution, it also includes setting a post-casting hole;

[0019] The provision of the post-casting hole specifically includes: after the first-casting top plate is cast, a post-casting hole is opened on the raised portion of the first-casting top plate, and the post-casting hole is provided through the raised portion.

[0020] As a preferred technical solution, it also includes pouring three times;

[0021] The three pouring steps specifically include: after obtaining the post-cast top plate, three pouring steps are performed along the post-cast holes.

[0022] The present application also provides a subway station roof, which is constructed by the above-mentioned subway station roof stage pouring construction method.

[0023] A method for pouring a subway station roof in stages in the present application comprises the following steps: a formwork assembly is arranged in a foundation pit; the formwork assembly and a first side wall of the foundation pit define a first pouring space; pouring is performed in the first pouring space to obtain a first-poured roof slab; and then the formwork assembly is removed; a second bottom plate is suspended between the second side wall of the foundation pit and the first-poured roof slab; the second bottom plate is flush with the bottom edge of the first-poured roof slab; the second side wall of the foundation pit, the top of the second bottom plate and one side of the first-poured roof slab define a second pouring space; a second pouring is performed in the second pouring space to obtain a later-poured roof slab; the first-poured roof slab and the later-poured roof slab obtained by the method are in a mutually interlocking structural form, which can effectively improve the stress-bearing performance, pouring quality and impermeability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application is further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present application. In addition, unless otherwise specified, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0025] Figure 1 It is a schematic diagram of the template assembly of the present invention;

[0026] Figure 2 This is a schematic diagram of the cast-first top plate of the present invention;

[0027] Figure 3 It is a schematic diagram of the post-cast roof slab of the present invention;

[0028] Figure 4It is a schematic diagram of the steel bar arrangement of the present invention;

[0029] Figure 5 It is a schematic diagram of the post-casting hole of the present invention;

[0030] Among them: 1. foundation pit; 11. first side wall; 12. second side wall; 2. formwork assembly; 21. bottom plate; 22. side plate; 23. raised portion; 3. first steel bar; 31. steel bar connector; 4. second steel bar; 5. first cast top plate; 51. post-cast hole; 6. post-cast top plate. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present application, it should be understood that the terms "front", "rear", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] See also Figure 1-3 , a subway station roof stage pouring construction method provided in an embodiment of the present application, comprising:

[0034] Constructing a cast-in-place top plate 5; constructing a formwork assembly 2 in a foundation pit 1, wherein the formwork assembly 2 comprises a side plate 22, a bottom plate 21 and a raised portion 23, wherein the bottom plate 21 is constructed at the bottom of the foundation pit 1, and one side of the bottom plate 21 along the width direction is connected to the first side wall 11 of the foundation pit 1, and a gap is left between the other side of the bottom plate 21 along the width direction and the second side wall 12 of the foundation pit 1, the first side wall 11 and the second side wall 12 are arranged opposite to each other, the side plate 22 is located above the bottom plate 21, and the bottom side of the side plate 22 is connected to the other side of the bottom plate 21 along the width direction, the raised portion 23 is arranged on a side of the side plate 22 facing the first side wall 11, a first pouring space is defined between one side of the formwork assembly 2 and the first side wall 11 of the foundation pit 1, and pouring is performed in the first pouring space to obtain the cast-in-place top plate 5;

[0035] Construct the post-cast top slab 6; remove the formwork assembly 2, and build a second bottom plate 21 in the air at the interval between the other side of the bottom plate 21 along the width direction and the second side wall 12 of the foundation pit 1, and one side of the second bottom plate 21 along the width direction is connected to the second side wall 12 of the foundation pit 1, and the other side is connected to the bottom edge of the first-cast top slab 5, the second side wall 12 of the foundation pit 1, the top of the second bottom plate 21 and one side of the first-cast top slab 5 define a second pouring space, and secondary pouring is performed in the second pouring space to obtain the post-cast top slab 6.

[0036] In this embodiment, a first pouring space is defined by the formwork assembly 2 and the first side wall 11 of the foundation pit 1, and concrete is poured into the second pouring space to obtain a first cast top plate 5, and then the formwork assembly 2 is removed, and one side of the first cast top plate 5 and the second bottom plate 21 together form a post-cast formwork. The second side wall 12 of the foundation pit 1, the top of the second bottom plate 21 and one side of the first cast top plate 5 define a second pouring space, and concrete is poured into the second pouring space to obtain a post-cast top plate 6 that is interlocked with the first cast top plate 5. The interlocking structure can increase the effective intersection of the two parts cast in stages, increase the length of the intersection surface in both the thickness and length directions, and avoid the formation of leakage seams at the intersection to produce leakage points.

[0037] For further information, see Figure 4 , further comprising arranging a first steel bar 3 and a second steel bar 4;

[0038] The arranging of the first steel bar 3 specifically includes: after the formwork assembly 2 is built in the foundation pit 1, the first steel bar 3 is arranged at the upper and lower parts of one side of the foundation pit 1, one end of the first steel bar 3 is connected to the first side wall 11 of the foundation pit 1, and the other end is connected to one side of the formwork assembly 2;

[0039] The arrangement of the second steel bar 4 specifically includes: after the second bottom plate 21 is built in the foundation pit 1, the second steel bar 4 is arranged at the upper and lower parts of the other side of the foundation pit 1, one end of the second steel bar 4 is connected to the second side wall 12 of the foundation pit 1, and the other end is connected to the first steel bar 3. A steel bar connector 31 is installed at the other end of the first steel bar 3, and the first steel bar 3 and the second steel bar 4 are connected through the steel bar connector 31.

[0040] In this embodiment, the first steel bar 3 and the second steel bar 4 are arranged before the two pourings, and the two parts of the steel bars are connected by a steel bar connector 31. Unlike the conventional steel bars connected at the same section, the staggered connection of the steel bars can reduce the risk of the joint becoming a weak point, improve the connectivity of the overall structure, and enable the two parts poured in stages to form an effective overall structure; at the same time, the construction interface is increased to facilitate on-site construction.

[0041] Furthermore, it also includes arranging a first additional reinforcement and a second additional reinforcement;

[0042] The arranging of the first additional steel bar specifically includes: after the first steel bar 3 is arranged, the first additional steel bar is arranged along one side of the foundation pit 1, one end of the first additional steel bar is connected to the middle of the first side wall 11 of the foundation pit 1, and the other end is connected to the middle of one side of the formwork assembly 2;

[0043] The arranging of the second additional reinforcement specifically includes: after the second reinforcement 4 is arranged, the second additional reinforcement is arranged on the other side of the foundation pit 1, one end of the second additional reinforcement is connected to the middle of the second side wall 12 of the foundation pit 1, and the other end is connected to the first additional reinforcement. A reinforcement connector 31 is installed at the other end of the first additional reinforcement, and the first additional reinforcement and the second additional reinforcement are connected through the reinforcement connector 31.

[0044] In this embodiment, a first additional steel bar and a second additional steel bar are added, and the two parts of steel bars are connected by a steel bar connector 31, so as to increase the integrity of the phased casting node and improve the stress performance and crack resistance of the node area.

[0045] Furthermore, there are a plurality of protrusions 23, and the plurality of protrusions 23 are staggered and arranged at intervals on the side of the side plate 22 facing the first side wall 11. By providing a plurality of protrusions 23, and the protrusions 23 are staggered from top to bottom on the side plate 22, a plurality of grooves are formed on one side of the first cast top plate 5 after one pouring, and then a plurality of protrusions engaging with the grooves are formed on one side of the post-cast top plate 6 obtained by the second pouring, thereby increasing the number of engaging structures and making the two parts more tightly connected at the connection part, thereby enhancing the anti-seepage performance at the joint.

[0046] Furthermore, the height of the side plate 22 is ≥750 mm. If the height of the side plate 22 is less than this size, the thickness of the first cast top plate 5 and the second cast top plate 6 formed by pouring is too small to form an effective bite, and the connectivity of the overall structure cannot be guaranteed.

[0047] For further information, see Figure 5 , further comprising setting a post-casting hole 51 and performing three pourings;

[0048] The provision of the post-casting hole 51 specifically includes: after the cast-in-place top plate 5 is cast, a post-casting hole 51 is opened on the raised portion 23 of the cast-in-place top plate 5 , and the post-casting hole 51 is provided through the raised portion 23 .

[0049] The three pouring steps specifically include: after obtaining the post-cast top plate 6 , three pouring steps are performed along the post-cast holes 51 .

[0050] In this embodiment, by setting the post-casting holes 51 on the raised portion 23 of the first-cast top plate 5, and then performing three pouring through the post-casting holes 51, it can be ensured that the post-cast top plate 6 is effectively cast, reducing the situation where voids are often generated at the joints during phased casting, thereby ensuring the casting quality; and the post-casting holes 51 are set in the thickness direction and are staggered, thereby avoiding the concentrated weakening of the overall structure by the post-casting holes 51 and reducing the risk of cracking and leakage.

[0051] The present application also provides a subway station roof, which is constructed by the above-mentioned subway station roof stage pouring construction method, and the subway station roof has good strength, crack resistance and impermeability.

[0052] In summary, the present embodiment provides a method for staged pouring construction of a subway station roof, which increases the connectivity and integrity of the staged cast overall structure by processing the junction of the first poured roof slab 5 and the later poured top into a special tongue-and-groove form, that is, a mutually interlocking form, thereby avoiding the formation of leakage seams at the junction and the generation of leakage points.

[0053] This specification discloses the present application with reference to the accompanying drawings, and also enables those skilled in the art to implement the present application, including making and using any device or system, using suitable materials, and using any combined method. The scope of the present application is defined by the technical solution for protection, and includes other examples that occur to those skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the technical solution for protection, or such other examples contain equivalent structural elements that are not substantially different from the literal language of the technical solution for protection, such other examples should be considered to be within the scope of protection determined by the technical solution for protection of the present application.

Claims

1. A method for pouring the roof of a subway station in stages, characterized in that: include: Constructing a cast-in-place top plate; building a formwork assembly in a foundation pit, the formwork assembly comprising a side plate, a bottom plate and a raised portion, the bottom plate being built at the bottom of the foundation pit, and one side of the bottom plate along the width direction is connected to a first side wall of the foundation pit, a gap is left between the other side of the bottom plate along the width direction and the second side wall of the foundation pit, the first side wall and the second side wall are arranged opposite to each other, the side plate is located above the bottom plate, and the bottom side of the side plate is connected to the other side of the bottom plate along the width direction, the raised portion is arranged on a side of the side plate facing the first side wall, a first pouring space is defined between one side of the formwork assembly and the first side wall of the foundation pit, pouring is performed in the first pouring space to obtain the cast-in-place top plate; The top slab is poured after construction; The formwork assembly is removed, and a second bottom plate is suspended in the gap between the other side of the bottom plate along the width direction and the second side wall of the foundation pit, and one side of the second bottom plate along the width direction is connected to the second side wall of the foundation pit, and the other side is connected to the bottom edge of the first cast top plate. The second side wall of the foundation pit, the top of the second bottom plate and one side of the first cast top plate define a second casting space, and secondary casting is performed in the second casting space to obtain the post-cast top plate.

2. The method for pouring the subway station roof in stages as claimed in claim 1, characterized in that: Also included is arranging a first reinforcement and a second reinforcement; The arranging of the first steel bar specifically includes: after the formwork assembly is built in the foundation pit, arranging the first steel bar at the upper part and the lower part of one side of the foundation pit, wherein one end of the first steel bar is connected to the first side wall of the foundation pit, and the other end is connected to one side of the formwork assembly; The arranging of the second steel bar specifically includes: after the second base plate is built in the foundation pit, the second steel bar is arranged on the upper and lower parts of the other side of the foundation pit, one end of the second steel bar is connected to the second side wall of the foundation pit, and the other end is connected to the first steel bar.

3. The method for pouring the subway station roof in stages as claimed in claim 2, characterized in that: A steel bar connector is installed at the other end of the first steel bar, and the first steel bar and the second steel bar are connected through the steel bar connector.

4. The method for pouring the subway station roof in stages as claimed in claim 3, characterized in that: Also included is arranging a first additional reinforcement and a second additional reinforcement; The arranging of the first additional reinforcement specifically includes: after the first reinforcement is arranged, arranging the first additional reinforcement along one side of the foundation pit, wherein one end of the first additional reinforcement is connected to the middle of the first side wall of the foundation pit, and the other end is connected to the middle of one side of the formwork assembly; The arranging of the second additional steel bar specifically includes: after the second steel bar is arranged, arranging the second additional steel bar on the other side of the foundation pit, one end of the second additional steel bar is connected to the middle of the second side wall of the foundation pit, and the other end is connected to the first additional steel bar.

5. The method for pouring the subway station roof in stages as claimed in claim 4, characterized in that: A steel bar connector is installed at the other end of the first additional steel bar, and the first additional steel bar is connected to the second additional steel bar through the steel bar connector.

6. The method for pouring the subway station roof in stages as claimed in claim 1, characterized in that: There are a plurality of protrusions, and the plurality of protrusions are arranged at intervals and staggered on a surface of the side plate facing the first side wall.

7. The method for pouring the subway station roof in stages as claimed in claim 6, characterized in that: The height of the side panel is ≥750mm.

8. The method for pouring the subway station roof in stages as claimed in claim 7, characterized in that: It also includes setting a post-pouring hole; The provision of the post-casting hole specifically includes: after the first-casting top plate is cast, a post-casting hole is opened on the raised portion of the first-casting top plate, and the post-casting hole is provided through the raised portion.

9. The method for pouring the subway station roof in stages as claimed in claim 8, characterized in that: It also involves performing three pours; The three pouring steps specifically include: after obtaining the post-cast top plate, three pouring steps are performed along the post-cast holes.

10. A subway station roof, characterized in that: The subway station roof is constructed by the staged pouring construction method as described in claims 1-9.

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