Construction method for combining forward and reverse construction of subway station and serving as inner support

Abstract

The invention relates to the technical field of metro station construction, in particular to a metro station clockwise and anticlockwise combined construction floor and inner support construction method which comprises the following steps: S1, sloping and layer-by-layer excavation is carried out in a foundation pit range until a first depth is reached; s2, a supporting layer plate is constructed at the first depth, and a reverse construction area is reserved; s3, after the supporting laminates are formed, multiple layers of common laminates are sequentially constructed above the supporting laminates from bottom to top till all the common laminates above the supporting laminates are constructed; and S4, excavation continues to be conducted through the reverse construction area, the reverse construction laminates are poured layer by layer from top to bottom till pouring of all the reverse construction laminates is completed. According to the scheme, after excavation, the supporting layer plates are constructed firstly, the foundation pit is supported through the supporting layer plates, then excavation is conducted in the reverse construction area, deviation of the side wall of the foundation pit is reduced, and meanwhile the possibility that the side wall of the foundation pit collapses is reduced. And after the supporting laminates are constructed, construction can be carried out above and below the supporting laminates at the same time, and the construction efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of subway station construction, and in particular to a construction method for a subway station in which a floor slab is constructed in a forward and reverse manner and serves as an internal support. Background Art

[0002] When constructing a subway station parking lot, the forward excavation method is generally adopted, that is, the foundation pit is first excavated, and then pile foundation construction is carried out at the bottom of the foundation pit, and then each floor slab is constructed from bottom to top until the roof is completed.

[0003] However, when the forward excavation method is adopted, since the foundation pit needs to be excavated at one time, although the foundation pit support structure is used during excavation, it is still easy to cause a large deviation of the side wall of the foundation pit. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a construction method for a subway station in which a floor slab is constructed in a forward and reverse manner and serves as an internal support.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a construction method for a subway station floor slab that also serves as an internal support by combining forward and reverse construction, comprising the following steps: S1, excavating layer by layer by sloping within the foundation pit until a first depth is reached, and setting up a supporting structure after each layer of excavation is completed; S2, constructing a supporting layer at the first depth, and reserving a reverse construction area; S3, after the supporting layer is formed, constructing multiple layers of ordinary layer slabs from bottom to top above the supporting layer slab in sequence until all ordinary layer slabs above the supporting layer slab are constructed; S4, continuing to excavate through the reverse construction area, and pouring the reverse construction layer slab layer by layer from top to bottom until all the reverse construction layer slabs are poured.

[0006] The construction method of the subway station of the present invention, which combines the forward and reverse construction of the floor slab and serves as the internal support, first constructs the support layer plate after excavation, supports the foundation pit through the support layer plate, and then excavates in the reverse construction area, thereby reducing the deviation of the side wall of the foundation pit and reducing the possibility of the side wall of the foundation pit collapsing. After the support layer plate is constructed, construction can be carried out above and below the support layer plate at the same time, thereby improving the construction efficiency.

[0007] Furthermore, in step S1, the site within the foundation pit is first excavated to a second depth at a slope of 1:1.5, and a cover plate is constructed at the second depth. After the cover plate construction is completed, excavation is continued to the first depth.

[0008] Furthermore, in step S1, the pull-out piles and cast-in-place piles are first driven into the second depth, and then the supporting slab is constructed.

[0009] Furthermore, the thickness of the supporting layer is more than 1.3 times the thickness of an ordinary layer.

[0010] Furthermore, in step S3, the common layer slab is constructed by using the floor slab quick-install formwork.

[0011] Furthermore, the floor slab quick-install formwork includes a formwork; an upper formwork, which is fixedly connected to the bottom surface of the formwork; a lower formwork, which is arranged below the upper formwork; a lifting assembly, which is arranged between the upper formwork and the lower formwork and is used to control the distance between the upper formwork and the lower formwork, and the lifting assembly includes: a first slider, two of which are provided and both slide on the bottom surface of the upper formwork; a second slider, two of which are provided and both slide on the top surface of the lower formwork; a connecting rod, two of which are provided and the middle parts of the two connecting rods are hinged, each of which is hinged to the first slider at one end and to the second slider at the other end, and the two connecting rods are cross-arranged; a locking piece, which is used to lock the first slider and the upper formwork and the second slider and the lower formwork.

[0012] Furthermore, the locking member includes a locking rod, and fixing holes are opened on the upper mold frame and the lower mold frame in the vertical direction. There are multiple fixing holes arrayed along the sliding direction of the first slider, and one end of the locking rod is inserted into the fixing hole of the upper mold frame, and the other end is inserted into the fixing hole of the lower mold frame.

[0013] Furthermore, one end of the locking rod is threadedly connected to the first slider, and the other end is inserted into the second slider and fixed by a latch.

[0014] Furthermore, the fixing hole is a through hole.

[0015] Furthermore, a reinforcing rod is provided between the upper mold frame and the lower mold frame.

[0016] Furthermore, the reinforcing rod includes a sleeve, which is hinged to the lower mold frame, and the sleeve has a plurality of first locking holes arrayed along its length direction; a movable plate, which is inserted into the sleeve, and the movable plate is fixedly connected to the upper mold frame by bolts, and the movable plate has a plurality of second locking holes arrayed along its length direction; and a locking pin, which is inserted into the first locking hole and the second locking hole at the same time.

[0017] Furthermore, a support plate is fixedly connected to the movable plate, the support plate abuts against the bottom surface of the upper mold frame, and the support plate is connected to the upper mold frame by bolts.

[0018] Furthermore, a connecting rod is hinged on the lower mold frame, and a connecting plate is provided at one end of the connecting rod away from the lower mold frame, and the connecting plate is used to be connected to an adjacent fixed object.

[0019] Furthermore, the connecting plate is hinged to the connecting rod.

[0020] Furthermore, the connecting rod is a telescopic rod.

[0021] The beneficial effects of the present invention are:

[0022] 1. After excavation, the support layer is constructed first to support the foundation pit, and then excavation is carried out in the reverse working area, which reduces the deviation of the side wall of the foundation pit and reduces the possibility of collapse of the side wall of the foundation pit. After the support layer is constructed, construction can be carried out above and below the support layer at the same time, which can improve construction efficiency;

[0023] 2. First, excavate to the second depth to construct the cover plate, so as to facilitate other construction projects on the cover plate and improve the construction efficiency. Then continue to dig to the first depth. Compared with the reverse method of digging down and pouring layer by layer, the efficiency of digging is higher;

[0024] 3. The two connecting rods are cross-arranged. When the template needs to be supported, the upper mold frame and the lower mold frame are moved back to back, so that the two connecting rods can rotate relative to each other. When the distance between the upper mold frame and the lower mold frame reaches a predetermined length, the first slider and the upper mold frame, and the second slider and the lower mold frame are respectively fixed by the locking member, so that the upper mold frame and the lower mold frame can be relatively fixed, thereby facilitating the support of the template. Through the setting of the connecting rod and the locking member, the template can be quickly installed, thereby improving the overall installation efficiency;

[0025] 4. By setting the locking rod, it is convenient to support the upper mold frame, thereby distributing the pressure of the connecting rod and improving the stability of the template. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 It is a structural schematic diagram of a construction method for combining forward and reverse construction of a subway station floor slab and serving as an internal support in the present invention.

[0028] Figure 2 It is a structural schematic diagram of the overall floor slab quick-install template in the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the locking rod and the insertion section in the invention.

[0030] Figure 4 It is a structural schematic diagram of the fixing hole in the present invention.

[0031] Figure 5 It is a structural schematic diagram of the connecting plate in the present invention.

[0032] In the figure: 1, template; 2, upper mold frame; 3, lower mold frame; 4, first slide block; 41, second slide block;

[0033] 43. connecting rod; 44. locking rod; 441. insertion section; 45. fixing hole; 5. reinforcing rod; 51. sleeve;

[0034] 511. first locking hole; 52. movable plate; 521. second locking hole; 53. locking pin; 54. support plate; 6. connecting rod; 61. connecting plate; 7. first depth; 72. second depth; 73. pull-out pile; 74. cast-in-place pile; 75. supporting layer plate; 76. ordinary layer plate; 77. reverse-worked layer plate; 78. reverse-worked area; 79. support rod; 8. cover plate. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] Reference Figure 1 A construction method for a subway station with a floor slab that is constructed in a forward and reverse manner and also serves as an internal support, comprising the following steps:

[0037] S1. The site is first excavated to the second depth 72 with a slope of 1:1.5 within the scope of the foundation pit. Anti-pullout piles 73 and cast-in-place piles 74 are first driven into the second depth 72. Support rods 79 are fixed on some of the anti-pullout piles 73. Then, a cover plate 8 is constructed at the second depth 72. The cast-in-place piles 74 and support rods 79 are used to support the cover plate 8. After the construction of the cover plate 8 is completed, excavation is continued layer by layer until the first depth 7. After each layer of excavation is completed, a support structure is set.

[0038] S2. Construct a support layer slab 75 at the first depth 7, and reserve a reverse working area 78 on the support layer slab 75 to facilitate continued excavation.

[0039] S3. After the support layer 75 is formed, multiple layers of ordinary layer 76 are sequentially constructed from bottom to top above the support layer 75 until all ordinary layer 76 above the support layer 75 are constructed. During construction, the ordinary layer 76 can be constructed through the floor slab quick-install template to further improve the construction efficiency. The thickness of the support layer 75 is more than 1.3 times the thickness of the ordinary layer 76, and more than 1.4 times in this embodiment. If the reverse construction area 78 is no longer excavated downward in the future, the support layer 75 can be used as a base plate, reducing the cost of increasing the support layer 75 through construction in the later stage.

[0040] S4, continue excavating through the reverse working area 78, and pour the reverse working layer plate 77 layer by layer from top to bottom until all the reverse working layer plates 77 are poured. In this embodiment, only one layer of reverse working layer plate 77 is poured, and the thickness of the bottom layer of reverse working layer plate 77 is the same as that of the supporting layer plate 75, and is used as the bottom plate. After the reverse working layer plate 77 is formed, the anti-pulling pile 73 located on the bottom layer of reverse working layer plate 77 is removed.

[0041] Working principle: After excavation, the support layer 75 is constructed first, and the foundation pit is supported by the support layer 75, and then excavation is carried out in the reverse working area 78, which reduces the displacement of the side wall of the foundation pit and reduces the possibility of collapse of the side wall of the foundation pit. After the support layer 75 is constructed, construction can be carried out above and below the support layer 75 at the same time, which can improve construction efficiency. First, excavate to the second depth 72 to construct the cover plate 8, which is convenient for other construction projects on the cover plate 8. After improving the construction efficiency, continue to dig forward to the first depth 7. Compared with the reverse working method of digging down layer by layer and pouring layer by layer, the forward excavation efficiency is higher.

[0042] Reference Figures 2 to 5 The floor slab quick-install formwork includes a formwork 1, an upper formwork frame 2 is fixedly connected to the bottom surface of the formwork 1, a lower formwork frame 3 is arranged below the upper formwork frame 2, and a lifting component is arranged between the upper formwork frame 2 and the lower formwork frame 3, and the lifting component is used to control the distance between the upper formwork frame 2 and the lower formwork frame 3.

[0043] The lifting assembly includes a first slider 4, a second slider 41 and a connecting rod 43. There are two first sliders 4 and two second sliders 41. The two first sliders 4 slide on the bottom surface of the upper mold frame 2; the two second sliders 41 slide on the top surface of the lower mold frame 3. There are also two connecting rods 43. The two connecting rods 43 are cross-arranged and hinged in the middle of the two connecting rods 43. One end of each connecting rod 43 is hinged to the first slider 4, and the other end is hinged to the second slider 41. A locking piece is also provided on the connecting rod 43, which is used to lock the first slider 4 and the upper mold frame 2 and the second slider 41 and the lower mold frame 3. The first slider 4 and the upper mold frame 2 can be slidably connected by a dovetail block and a dovetail groove. The structure between the second slider 41 and the lower mold frame 3 can be the same as the structure between the first slider 4 and the upper mold frame 2.

[0044] The locking member includes a locking rod. The upper mold frame 2 and the lower mold frame 3 are both provided with fixing holes 45 in the vertical direction. The fixing holes 45 are through holes. There are multiple fixing holes 45 arrayed along the sliding direction of the first slider 4. One end of the locking rod is inserted into the fixing hole 45 of the upper mold frame 2, and the other end is inserted into the fixing hole 45 of the lower mold frame 3. One end of the locking rod is threadedly connected to the first slider 4, and the other end is inserted into the second slider 41 and fixed by a pin. An insertion section 441 is fixed to the threaded end of the locking rod. The diameter of the insertion section 441 is smaller than the diameter of the locking rod, so as to facilitate insertion into the fixing hole 45 of the upper mold frame 2. During installation, the locking rod 44 is inserted into the fixing hole 45 on the lower mold frame 3, and then passes through the lower mold frame 3 and the second slider 41 in sequence, and then the locking rod 44 is rotated so that the locking rod 44 is threadedly connected with the first slider 4. During the rotation of the locking rod 44, the insertion section 441 is gradually inserted into the fixing hole 45 of the upper mold frame 2. When the locking rod 44 is installed to the preset position, the second slider 41 is fixed to the locking rod by a pin, thereby realizing the fixation between the first slider 4, the second slider 41 and the connecting rod 43.

[0045] A reinforcing rod 5 is provided between the upper mold frame 2 and the lower mold frame 3. The reinforcing rod 5 includes a sleeve 51, which is hinged to the lower mold frame 3. The sleeve 51 has a plurality of first locking holes 511 arrayed along its length direction. A movable plate 52 is inserted into the sleeve 51, and the movable plate 52 is fixedly connected to the upper mold frame 2 by bolts. A plurality of second locking holes 521 are arrayed along its length direction on the movable plate 52. A locking pin 53 is inserted into the first locking hole 511. When the relative position of the movable plate 52 and the sleeve 51 is determined, the locking pin 53 is simultaneously inserted into the corresponding first locking hole 511 and the second locking hole 521, so that the relative fixation of the movable plate 52 and the sleeve 51 can be achieved. The spacing between the first locking hole 511 and the second locking hole 521 is set according to the spacing between the fixing holes 45, so that each fixing hole 45 has a corresponding first locking hole 511 and a second locking hole 521, that is, each height of the upper mold frame 2 has a corresponding reinforcing plate adapted thereto.

[0046] The movable plate 52 is fixedly connected with a support plate 54, which abuts against the bottom surface of the upper mold frame 2. The support plate 54 is connected to the upper mold frame 2 by bolts, so as to facilitate supporting the upper mold frame 2 and improve the supporting force of the template 1. Multiple groups of reinforcing rods 5 can be provided to increase the overall strength and stability of the upper mold frame 2 and the lower mold frame 3.

[0047] A connecting rod 6 is hinged on the lower mold frame 3. A connecting plate 61 is provided at one end of the connecting rod 6 away from the lower mold frame 3. The connecting plate 61 is used to connect to an adjacent fixed object and can be connected by bolts. The connecting plate 61 is hinged to the connecting rod 6 to facilitate connections at different angles and improve the convenience of connection. The connecting rod 6 is a telescopic rod, and the structure can be the same as that of the reinforcing rod 5, which will not be repeated here.

[0048] Working principle: Two connecting rods 43 are cross-arranged. When the template 1 needs to be supported, the upper mold frame 2 and the lower mold frame 3 are moved back to back, so that the two connecting rods 43 can rotate relative to each other. When the distance between the upper mold frame 2 and the lower mold frame 3 reaches a predetermined length, the first slider 4 is fixed to the upper mold frame 2, and the second slider 41 is fixed to the lower mold frame 3 respectively through the locking member, so that the upper mold frame 2 and the lower mold frame 3 can be relatively fixed, thereby facilitating the support of the template 1. Through the setting of the connecting rod 43 and the locking member, the template 1 can be quickly installed, thereby improving the overall installation efficiency. Then, the reinforcing rod 5 is unfolded, so that the support plate 54 is connected to the upper mold frame 2, the stability between the upper mold frame 2 and the lower mold frame 3 is improved, and the stability of the support for the template 1 is improved. Then the connecting rod 6 is connected to the adjacent upper mold frame 2, or connected to other fixed objects, to further improve the stability of the support for the template 1.

[0049] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A construction method for a subway station with a floor slab that is constructed in a forward and reverse manner and also serves as an internal support, characterized in that: The steps include: S1. Excavate the foundation pit layer by layer until the first depth (7) is reached. After each layer is excavated, a support structure is set up; S2, constructing a support layer plate (75) at a first depth (7) and reserving a reverse construction area (78); S3, after the supporting layer plate (75) is formed, multiple layers of common layer plates (76) are sequentially constructed from bottom to top above the supporting layer plate (75) until all the common layer plates (76) above the supporting layer plate (75) are constructed; S4. Continue excavating through the reverse working area (78), and pour the reverse working layer plates (77) layer by layer from top to bottom until the pouring of all reverse working layer plates (77) is completed.

2. The construction method of the subway station with the floor slab constructed in a forward and reverse direction and also serving as the internal support as claimed in claim 1, characterized in that: In step S1, the site within the foundation pit is first excavated to a second depth (72) at a slope of 1:1.5, and a cover plate (8) is constructed at the second depth (72). After the construction of the cover plate (8) is completed, excavation is continued to the first depth (7).

3. The construction method of the subway station with the floor slab constructed in a forward and reverse direction and also serving as the internal support as claimed in claim 2, characterized in that: In step S1, first, anti-pullout piles (73) and cast-in-place piles (74) are driven into the second depth (72), and then the supporting layer (75) is constructed.

4. The construction method of the subway station with the floor slab constructed in a forward and reverse direction and also serving as the internal support as claimed in claim 1, characterized in that: The thickness of the supporting layer plate (75) is more than 1.3 times the thickness of the common layer plate (76).

5. The construction method of the subway station with the floor slab constructed in a forward and reverse direction and also serving as the internal support as claimed in claim 1, characterized in that: In step S3, the common layer board (76) is constructed by using the floor slab quick assembly formwork.

6. The construction method of combining forward and reverse construction of subway station floor slabs and serving as internal supports as claimed in claim 5, characterized in that: The floor slab quick assembly formwork comprises Template (1); An upper mold frame (2), wherein the upper mold frame (2) is fixedly connected to the bottom surface of the template (1); A lower mold frame (3), wherein the lower mold frame (3) is arranged below the upper mold frame (2); A lifting assembly is arranged between the upper mold frame (2) and the lower mold frame (3) and is used to control the distance between the upper mold frame (2) and the lower mold frame (3). The lifting assembly comprises: A first sliding block (4), wherein two first sliding blocks (4) are provided and both slide on the bottom surface of the upper mold frame (2); A second sliding block (41), wherein two second sliding blocks (41) are provided and both slide on the top surface of the lower mold frame (3); Connecting rods (43), two connecting rods (43) are provided, and the middle parts of the two connecting rods (43) are hingedly arranged, one end of each connecting rod (43) is hingedly connected to the first slider (4), and the other end is hingedly connected to the second slider (41), and the two connecting rods (43) are cross-arranged; A locking piece, wherein the locking piece is used to lock the first slider (4) and the upper mold frame (2) and the second slider (41) and the lower mold frame (3).

7. The construction method of combining forward and reverse construction of subway station floor slabs and serving as internal supports as claimed in claim 6, characterized in that: The locking member comprises a locking rod. The upper mold frame (2) and the lower mold frame (3) are both provided with fixing holes (45) in the vertical direction. A plurality of the fixing holes (45) are arranged in an array along the sliding direction of the first slider (4). One end of the locking rod is inserted into the fixing hole (45) of the upper mold frame (2), and the other end is inserted into the fixing hole (45) of the lower mold frame (3).

8. The construction method of combining forward and reverse construction of subway station floor slabs and serving as internal supports as claimed in claim 7, characterized in that: One end of the locking rod is threadedly connected to the first slider (4), and the other end is inserted into the second slider (41) and fixed by a latch.

9. The construction method for combining forward and reverse construction of subway station floor slabs and serving as internal supports as claimed in claim 6, characterized in that: The fixing hole (45) is a through hole.

10. The construction method of the subway station with the floor slab constructed in a forward and reverse direction and also serving as the inner support as claimed in claim 6, characterized in that: A reinforcing rod (5) is provided between the upper mold frame (2) and the lower mold frame (3).

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