A construction method for a double-layer surrounding straight-curved mixed automobile ramp

Abstract

The invention discloses a construction method of a double-layer surrounding straight-curved mixed automobile ramp, comprising the following steps: S1, arc slope measurement information layout: using BIM technology to model the double-layer surrounding straight-curved mixed ramp, and using an RTK measuring instrument to complete the ramp coordinate positioning and elevation layout; S2, automobile ramp arc wall formwork construction: using BIM technology to model the double-layer ramp outer wall, according to the shape of the arc ramp structure, the double-layer ramp outer wall is decomposed into a plurality of unit blocks, and the formwork matching design is performed for each unit block; S3, double-layer surrounding straight-curved ramp structure concrete construction: the double-layer surrounding straight-curved ramp structure water flow section is divided, and the pouring sequence of the horizontal and vertical structures of each section is determined; S4, using the BIM model to simulate the arrangement of pipelines and sprinkler pipes, so that the clear height of the ramp driving route position meets the design requirements.

Description

Technical Field

[0001] The invention relates to the technical field of ramp concrete structure forming, and in particular to a construction method for a double-layer surrounding straight-curve mixed automobile ramp. Background Art

[0002] At present, most of the car ramps in China can be divided into straight ramps, curved ramps, spiral ramps, and straight-curved mixed ramps. For a large-scale comprehensive exhibition project, the structural form is a "double-layer surround straight-curved mixed" car ramp, with a total of 4 ramps, such as Figure 1 As shown, the first ramp 1# and the second ramp 2# are symmetrical to each other, and the third ramp 3# and the fourth ramp 4# are symmetrical to each other, all of which are symmetrical about the central axis of the exhibition hall on one side. The total length of the single-side car ramp is 138m, and the ramp structure is in the form of two layers, connecting the underground first floor and underground second floor car garages respectively. The width of the underground second floor ramp is 5269mm, and the width of the underground first floor ramp is 8400mm. Figure 2 As shown in the figure, the ramp entrance and exit are divided into two layers, the relative positions of the ramp structures of the underground first floor and the underground second floor are constantly changing during the process of rising to the ground. The underground second floor ramp "surrounds" the underground first floor ramp and rises. The relative elevation of the ramp is the same when it leaves the ground. Its structure is ingenious, realizing passenger and freight diversion, and perfectly solving the problem of congestion caused by excessive traffic, but this structure also brings great construction difficulty. Summary of the invention

[0003] The object of the present invention is to provide a construction method of a double-layer surrounding straight-curved hybrid automobile ramp to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides a construction method for a double-layer surrounding straight-curve hybrid automobile ramp, wherein the double-layer surrounding straight-curve hybrid automobile ramp comprises four ramps, wherein the first ramp and the second ramp are symmetrical to each other, the third ramp and the fourth ramp are symmetrical to each other, the first ramp and the third ramp are located on the same side, the second ramp and the fourth ramp are located on the same side, the ramp structure is in the form of two layers, the upper and lower layers are respectively connected to the underground first floor and the underground second floor car garage of a side hall, and the underground second floor ramp surrounds the underground first floor ramp to rise, and the relative elevation of the ramp when it is out of the ground is the same elevation, and the construction method for the double-layer surrounding straight-curve hybrid automobile ramp comprises the following steps:

[0005] S1. Arc slope measurement and information layout: Use BIM technology to model the double-layer surrounding straight and curved mixed ramp, and use RTK surveying instrument to complete the ramp coordinate positioning and elevation layout;

[0006] S2. Construction of the curved wall formwork for the car ramp: Use BIM technology to model the double-layer ramp exterior wall. According to the shape of the curved ramp structure, decompose the double-layer ramp exterior wall into several unit blocks, and design the formwork for each unit block;

[0007] S3. Concrete construction of double-layer surrounding straight-curved ramp structure: Divide the water flow section of the double-layer surrounding straight-curved ramp structure and determine the pouring sequence of the horizontal and vertical structures of each section;

[0008] S4. Use the BIM model to simulate the layout of pipelines and sprinkler pipes so that the clear height of the ramp route meets the design requirements.

[0009] In a preferred embodiment, in step S1, a double-layer surround straight-curve mixed ramp is modeled using BIM, and an RTK surveying instrument is used to complete the ramp coordinate positioning and elevation layout, including: S11, using BIM technology to perform 1:1 modeling of the double-layer surround straight-curve mixed ramp, and directly taking the coordinates and relative elevations of each part in the built BIM model; S12, exporting drawings with elevations and coordinates from the BIM model, transmitting them to the RTK surveying instrument for precise layout of the structure, and completing the ramp coordinate positioning and elevation layout.

[0010] In a preferred embodiment, in step S2, the construction of the curved wall formwork for the car ramp includes: using BIM technology on site to model the outer wall of the double-layer ramp, drawing the actual position of each formwork in the BIM model and numbering it, finding the three-dimensional coordinates of the four corners of the corresponding numbered template in the BIM model, and inputting the three-dimensional coordinates into the total station to accurately position each template.

[0011] In a preferred embodiment, the curved wall formwork adopts a 15mm thick multi-layer board, and the main keel reinforced by the formwork is pre-bent in advance according to the BIM model layout. The secondary keel and the main keel are fixed to the curved wall formwork with tension bolts. The main keel adopts two C22 steel bars with a spacing of 500mm, and the secondary keel adopts a 50×50 steel-wood keel with a spacing of 250mm. Multiple tension bolts are evenly spaced along the direction of the main keel with a spacing of 500mm. Steel bars are reserved on the bottom plate, and the side formwork support is directly diagonally braced to the reserved steel bars on the ramp bottom plate and is set at 45° to the ramp bottom plate.

[0012] In a preferred embodiment, in step S3, the water flow section of the double-layer surrounding straight-curve ramp structure is divided into three sections, including a first ramp, a second ramp and a third ramp, wherein the first ramp is a double-layer straight structure, and the upper and lower positional relationship between the third ramp and the first ramp, the fourth ramp and the second ramp remains unchanged, wherein the first ramp is completely below the third ramp, and the second ramp is completely below the fourth ramp; the second ramp is a double-layer curved structure, and on the basis of the first ramp, the first ramp and the second ramp are first horizontally displaced and then vertically displaced, so that the first ramp and the second ramp respectively surround the third ramp and the fourth ramp and rise; the third ramp is a single-layer straight structure, and the first ramp and the second ramp are parallel to the ramp entrances of the third ramp and the fourth ramp, respectively, and the ramp bottom elevations are the same elevation.

[0013] In a preferred embodiment, the pouring sequence of the first section of the ramp is: the first pouring is 300mm on both sides of the first ramp / second ramp ground, with a waterstop steel plate installed inside; the second pouring is at the connection between the walls on both sides of the first ramp / second ramp ground and the third ramp / fourth ramp ground, with a waterstop strip installed inside; after the waterproofing construction and backfill construction of the walls and ground on both sides of the first ramp / second ramp are completed, the third pouring begins, and the third pouring is 300mm on both sides of the third ramp / fourth ramp ground, with a waterstop steel plate installed inside; the fourth pouring is the walls and ramp top plate of the third ramp / fourth ramp.

[0014] In a preferred embodiment, the first pouring sequence of the second section of the ramp is: the pouring sequence when the first ramp is horizontally displaced relative to the third ramp and the second ramp is horizontally displaced relative to the fourth ramp, including: the first pouring of the first ramp / second ramp 300mm on both sides of the ground, with a waterstop steel plate installed inside; the second pouring of the connection between the walls on both sides of the ground of the first ramp / second ramp and the ground of the third ramp / fourth ramp, with a waterstop strip installed inside; the third pouring starts after the waterproofing construction of the walls and ground on both sides of the first ramp / second ramp and the backfill construction are completed; the third pouring of the third ramp / fourth ramp 300mm on both sides of the ground, with a waterstop steel plate installed inside; the fourth pouring of the walls and ramp top plate of the third ramp / fourth ramp.

[0015] In a preferred embodiment, the second pouring sequence of the second section of the ramp is: the pouring sequence when starting the vertical displacement after the first ramp / second ramp completes the horizontal displacement, including: the first pouring of the first ramp / second ramp 300mm on both sides of the ground, with a waterstop steel plate inside; the second pouring of the outdoor wall on the inner side of the first ramp / second ramp, where the wall height decreases as the ramp height increases, and when the wall height is less than 300mm, the waterstop steel plate is replaced by a waterstop strip; after the waterproofing construction of the walls and the ground on both sides of the first ramp / second ramp and the backfill construction are completed, the third pouring is started. The first pouring is the first pouring, and the third pouring is 300mm up on the outside of the third ramp / fourth ramp, with a waterstop steel plate on the outside; the fourth pouring is the inner indoor wall of the first ramp / second ramp, where the wall height increases with the increase of the ramp elevation; the fifth pouring is the outer wall of the first ramp / second ramp and the top of the ramp, where the inner side of the top is 300mm up, and a waterstop steel plate is installed, where the upper wall height decreases with the increase of the ramp elevation, and when the height is less than 300mm, the waterstop steel plate is changed to a waterstop strip; the sixth pouring is the side wall and top plate of the third ramp / fourth ramp.

[0016] In a preferred embodiment, the pouring sequence of the third section of the ramp is: the pouring sequence when the bottom elevations of the first ramp and the third ramp, the second ramp and the fourth ramp are at the same elevation, including: the first pouring of the first ramp and the third ramp, the second ramp and the bottom of the fourth ramp, and setting a waterstop steel plate 300mm outside the side wall; the second pouring of the walls of the first ramp and the third ramp, the second ramp and the fourth ramp; after the structural columns on the upper side walls of the first ramp and the second ramp are completed, the top of the first ramp and the second ramp is poured for the third time.

[0017] In a preferred embodiment, in step S4, the arrangement of pipelines and sprinkler pipes is simulated using a BIM model so that the clear height of the ramp driving route meets the design requirements, including: using a BIM model to simulate the arrangement of pipelines and sprinkler pipes so that the clear height in the middle of the ramp meets the design requirements, and at the same time, the original upward spraying form of the sprinkler pipe is optimized to a side-outlet upward spraying form, and the height of the sprinkler pipe is increased by 180mm-200mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention solves the problem of difficult ramp slope positioning: Since the ramp structure is a "double-layer surrounding straight-curved mixed ramp", the upper and lower ramp structures are not always in a relatively static state. As the slope increases, the relative positions of the upper and lower ramps also change accordingly; the slopes of different slope sections in the same ramp are inconsistent, which increases the difficulty of ramp coordinate positioning and elevation layout. The present invention uses BIM technology to model the double-layer surrounding straight-curved mixed ramp. After the model is built, the coordinates and relative elevations of each part can be directly selected in the model, and drawings with elevations and coordinates can be exported from the BIM model and transmitted to the RTK surveying instrument, ultimately achieving accurate positioning of the on-site structure.

[0020] 2. The present invention solves the problem of complicated concrete pouring sequence and difficult forming: Due to the complex structure of the ramp, it is impossible to adopt the common pouring idea of ​​"first pouring vertical components and then pouring horizontal components" for construction. The present invention divides the flow section of the double-layer surrounding straight and curved ramp structure and determines the pouring sequence of the horizontal and vertical structures of each section, thereby solving the problem of concrete pouring construction of the double-layer surrounding straight and curved ramp structure.

[0021] 3. The present invention solves the problem of difficult reinforcement of the ramp curved side wall template: the ramp structure is a double-layer surrounding straight and curved mixed structure, a part of the side wall is a curved structure, the height of the outer walls on both sides is three meters, and the spatial relative position of the two-layer ramp is constantly changing, which makes it difficult to accurately locate and measure the shape of the curved wall, and the curvature and flatness of the curved wall are difficult to control during construction. The present invention decomposes the curved structure into several unit blocks according to the shape of the curved structure, and designs the template for each unit block. The BIM technology is used on-site to model the double-layer ramp outer wall, and the actual position of each template is drawn and numbered in the model. The three-dimensional coordinates of the four corners of the corresponding numbered template are found in the model, and the three-dimensional coordinates are input into the total station, so that each template can be accurately positioned to ensure the quality of concrete molding, and a specific template and its support system are used to ensure the curvature of the curved wall and the quality of concrete molding during construction.

[0022] 4. The present invention solves the problem of difficult control of ramp clear height: after the garage structure is completed, with the start of the construction of electromechanical pipelines, the clear height of the garage is also a very important control point. Due to the limitations of the structure, ground decoration methods and electromechanical pipelines, the clearance of the car ramp is quite tight. The present invention uses the BIM model to simulate the layout of pipelines and spray pipes to ensure that the clear height of the ramp driving route position (middle of the ramp) meets the design requirements. At the same time, the original spray pipe upper spray form is optimized to a side-out spray form. This form can reduce the space of the nozzle on the upper part of the pipeline and increase the height of the spray pipe by 180mm-200mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A plan view of the ramp location of a preferred embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a BIM model of a double-layer surrounding straight-curve hybrid vehicle ramp of the present invention;

[0025] Figure 3 is a flow chart of the method of the present invention;

[0026] Figure 4 This is a schematic diagram of the arc slope measurement information setting-out of the present invention;

[0027] Figure 5 The schematic diagram of the water flow section of the present invention is divided into three sections;

[0028] Figure 6 It is a schematic diagram of the first section ramp structure and casting sequence of the present invention;

[0029] Figure 7 It is a schematic diagram of the second ramp structure and the first pouring sequence of the present invention;

[0030] Figure 8 It is a schematic diagram of the second ramp structure and the second pouring sequence of the present invention;

[0031] Fig. 9 It is a schematic diagram of the third section ramp structure and casting sequence of the present invention;

[0032] Fig.10 It is a schematic diagram of template positioning of the present invention;

[0033] Fig.11 It is a schematic diagram of the template reinforcement of the present invention;

[0034] Fig.12 for Fig.11 Side view of

[0035] Fig.13 This is a schematic diagram for comparing the optimization of the spray pipe of the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0037] The present invention takes a certain construction project as an example, and the double-layer surrounding straight and curved mixed car ramp includes four ramps, such as Figure 1As shown, the first ramp 1# and the second ramp 2# are symmetrical to each other, the third ramp 3# and the fourth ramp 4# are symmetrical to each other, and they are all symmetrical in the north-south direction with respect to the central axis of the east login hall 101. The total length of the single-side car ramp is 138m. The first ramp and the third ramp are located on the same side, and the second ramp and the fourth ramp are located on the same side. The ramp structure is in the form of upper and lower floors, which are respectively connected to the underground first floor and underground second floor car garages of one side hall, and the underground second floor ramp rises around the underground first floor ramp. The relative elevation of the ramp is the same when it leaves the ground. The width of the underground second floor ramp is 5269mm, and the width of the underground first floor ramp is 8400mm. The relative elevation of the bottom plate of the underground first floor car ramp rises from -6.300 to -1.600, and the relative elevation of the bottom plate of the underground second floor car ramp rises from -10.050 to -1.600.

[0038] like Figure 1-12 As shown, the construction method of the double-layer surrounding straight-curve mixed automobile ramp includes the following steps:

[0039] Step S1, arc slope measurement and information layout: use BIM technology to model the double-layer surrounding straight and curved mixed ramp, and use RTK surveying instrument to complete the ramp coordinate positioning and elevation layout;

[0040] Step S2, construction of the curved wall formwork for the car ramp: using BIM technology to model the outer wall of the double-layer ramp, decomposing the outer wall of the double-layer ramp into several unit blocks according to the shape of the curved ramp structure, and designing the formwork for each unit block;

[0041] Step S3, double-layer surrounding straight-curved ramp structure concrete construction: dividing the double-layer surrounding straight-curved ramp structure flow section, and determining the pouring order of each section of the horizontal and vertical structure;

[0042] Step S4: Use the BIM model to simulate the layout of pipelines and sprinkler pipes so that the clear height of the ramp driving route meets the design requirements.

[0043] Specifically, in step S1, the double-layer surrounding straight-curved mixed ramp is modeled using BIM, and the ramp coordinate positioning and elevation layout are completed using the RTK surveying instrument, including: S11, using BIM technology to perform 1:1 modeling of the double-layer surrounding straight-curved mixed ramp, and directly taking the coordinates and relative elevations of each part in the built BIM model; S12, exporting drawings with elevations and coordinates from the BIM model, transmitting them to the RTK surveying instrument to accurately layout the structure, and completing the ramp coordinate positioning and elevation layout.

[0044] Specifically, in step S2, the construction of the curved wall formwork for the car ramp includes: in the construction of the curved wall formwork, since the ramp is a curved structure, it is decomposed into several unit blocks according to the shape of the curved structure, and the formwork matching design is performed for each unit block. The deviation between the template installation completion surface of the present invention and the designed curved surface will be very small, and the fitting effect is good. The double-layer ramp exterior wall is modeled on site using BIM technology, and the actual position of each template is drawn and numbered in the BIM model (the size of the on-site template is 1200mm×2440mm, and the template is placed horizontally for easy construction). The three-dimensional coordinates X / Y / Z axes of the four corners of the corresponding numbered template are found in the BIM model, and the three-dimensional coordinates are input into the total station, so that each template can be accurately positioned to ensure the quality of concrete molding.

[0045] Since the construction of curved walls is difficult, in order to ensure the curvature of the curved walls and the quality of concrete forming during the construction process, the construction needs to be controlled from the following points:

[0046] 1) The calculation and design of the formwork and its supporting system must be safe and reliable, with reasonable cost and common materials that can be used in a revolving manner. The outer ribs can be processed on site according to the curvature of the curved wall, and the outer ribs of the formwork on both sides are connected by tension bolts. The outer ribs of the formwork are connected to the formwork system, and the rigid connection is reinforced by inner top and outer pull.

[0047] 2) The pouring method of concrete must meet the construction safety requirements. The pouring height of each layer is determined by calculation and strictly controlled to prevent excessive lateral pressure from causing excessive deformation of the formwork and its supporting system, leading to collapse.

[0048] 3) The elevation of the curved wall must be accurately controlled, the joints must be at the same elevation, and the concrete must be dense to avoid serious defects.

[0049] 4) The time for removing the formwork must be controlled to avoid adverse effects on the structure due to premature removal.

[0050] Based on the above four aspects, the curved wall formwork 111 of the present invention adopts a 15mm thick multi-layer board, and the main keel 112 reinforced by the formwork is pre-bent in advance according to the BIM model layout. The secondary keel 113 and the main keel 112 are fixed to the curved wall formwork 111 with tension bolts 114. The main keel 112 adopts two C22 steel bars with a spacing of 500mm. The secondary keel 113 adopts a 50×50 steel-wood keel with a spacing of 250mm. Multiple tension bolts 114 are evenly spaced along the direction of the main keel 112 with a spacing of 500mm. Steel bars 115 are reserved on the bottom plate, and the side formwork support 116 is directly diagonally braced to the reserved steel bars 115 of the ramp bottom plate and is set at 45° to the ramp bottom plate.

[0051] In a preferred embodiment, in step S3, the water flow section of the double-layer surrounding straight-curved ramp structure is divided into three sections, including a first ramp 501, a second ramp 502 and a third ramp 503, wherein the first ramp 501 is a double-layer straight structure, and the upper and lower positional relationship between the third ramp and the first ramp, the fourth ramp and the second ramp remains unchanged, wherein the first ramp is completely located below the third ramp, and the second ramp is completely located below the fourth ramp; the second ramp is a double-layer curved structure, and on the basis of the first ramp, the first ramp and the second ramp are first horizontally displaced and then vertically displaced, so that the first ramp and the second ramp respectively surround the third ramp and the fourth ramp and rise; the third ramp is a single-layer straight structure, and the first ramp and the second ramp are parallel to the ramp entrances of the third ramp and the fourth ramp, respectively, and the ramp bottom elevations are the same elevation.

[0052] Specifically, Figure 6 As shown in the figure, the pouring sequence of the first ramp is as follows: The first pouring of the first ramp (second ramp) is 300mm above the ground on both sides, and a water stop steel plate (such as Figure 6 601 area); the second pouring of the first ramp (second ramp) ground wall on both sides and the third ramp (fourth ramp) ground connection, with water stop strips inside (such as Figure 6 602 area); after the waterproofing construction and backfilling of the walls and ground on both sides of the first ramp (second ramp) are completed, the third pouring will begin. The third pouring of the third ramp (fourth ramp) will be 300mm above the ground on both sides, and a water-stop steel plate (such as Figure 6 603 area); the fourth pouring of the third ramp (fourth ramp) wall and ramp top plate (such as Figure 6 Central 604 area).

[0053] like Figure 7 As shown in the figure, there are two pouring sequences for the second ramp. The first pouring sequence is: the pouring sequence when the first ramp (second ramp) is horizontally displaced relative to the third ramp (fourth ramp), including: the first pouring of the first ramp (second ramp) 300mm above the ground on both sides, with water-stop steel plates (such as Figure 7 701 area in the middle); the second pouring is the connection between the walls on both sides of the first ramp (second ramp) and the ground of the third ramp (fourth ramp), with water stop strips installed inside; after the waterproofing construction of the walls and ground on both sides of the first ramp (second ramp) and the backfill construction are completed, the third pouring will begin (such as Figure 7 702 area in the middle); the third pouring of the third ramp (fourth ramp) on both sides of the ground 300mm up, with water stop steel plates (such as Figure 7 703 area in the middle); the fourth pouring of the third ramp (fourth ramp) wall and ramp top plate (such as Figure 7 Central 704 area).

[0054] like Figure 8 As shown in the figure, the second pouring sequence of the second ramp is: the pouring sequence when the first ramp (second ramp) completes the horizontal displacement and starts the vertical displacement, including: the first pouring of the first ramp (second ramp) 300mm above the ground on both sides, with water-stop steel plates (such as Figure 8 Middle 801 area); The second pouring of the outdoor wall inside the first ramp (second ramp), where the wall height decreases as the ramp height increases, when the wall height is less than 300mm, the water stop steel plate is replaced by a water stop strip (such as Figure 8 After the waterproofing construction and backfilling of the walls and ground on both sides of the first ramp (second ramp) are completed, the third pouring will begin. During the third pouring, a water-stop steel plate (such as Figure 8 803 area); the fourth pouring of the interior wall inside the first ramp (second ramp), where the wall height increases as the ramp elevation increases (such as Figure 8 804 area); The fifth pouring of the outer wall of the first ramp (second ramp) and the top of the ramp, the inner side of the top is 300mm up, and a water stop steel plate is set. Here, the upper wall height decreases with the increase of the ramp elevation. When the height is less than 300mm, the water stop steel plate is replaced by a water stop strip (such as Figure 8 805 area); the sixth pouring of the side walls and top plate of the third ramp (fourth ramp) (such as Figure 8 Central 806 area).

[0055] like Fig. 9 As shown in the figure, the pouring sequence of the third ramp is: the pouring sequence when the bottom elevations of the first ramp (second ramp) and the third ramp (fourth ramp) are the same, including: the first pouring of the bottom of the first ramp (second ramp) and the third ramp (fourth ramp), the side wall is reversed 300mm, and a water stop steel plate is set on the outside (such as Fig. 9 901 area); the second pouring of the walls of the first ramp (second ramp) and the third ramp (fourth ramp) (such as Fig. 9 902 area); after the structural columns on the side walls of the upper first ramp (second ramp) are completed, the top of the first ramp (second ramp) is poured for the third time (such as Fig. 9 Central 903 area).

[0056] Specifically, Fig.13 As shown, in step S4, the arrangement of pipelines and sprinkler pipes is simulated by using the BIM model so that the clear height of the ramp driving route meets the design requirements, including: using the BIM model to simulate the arrangement of pipelines and sprinkler pipes so that the clear height in the middle of the ramp meets the design requirements, and at the same time, the original sprinkler pipe upward spraying form is optimized to a side-outlet upward spraying form, and the height H of the sprinkler pipe 131 is increased by 180mm-200mm.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a double-layer surrounding straight-curved mixed automobile ramp, characterized in that: The double-layer surrounding straight-curve mixed car ramp includes four ramps, wherein the first ramp and the second ramp are symmetrical to each other, the third ramp and the fourth ramp are symmetrical to each other, the first ramp and the third ramp are located on the same side, the second ramp and the fourth ramp are located on the same side, the ramp structure is in the form of upper and lower layers, the upper and lower layers are respectively connected to the underground first floor and the underground second floor car garage of a side hall, and the underground second floor ramp surrounds the underground first floor ramp to rise, and the relative elevation of the ramp when it is out of the ground is the same elevation, and the construction method of the double-layer surrounding straight-curve mixed car ramp includes the following steps: S1. Arc slope measurement and information layout: Use BIM technology to model the double-layer surrounding straight and curved mixed ramp, and use RTK surveying instrument to complete the ramp coordinate positioning and elevation layout; S2. Construction of the curved wall formwork for the car ramp: Use BIM technology to model the double-layer ramp exterior wall. According to the shape of the curved ramp structure, decompose the double-layer ramp exterior wall into several unit blocks, and design the formwork for each unit block; S3. Concrete construction of double-layer surrounding straight-curved ramp structure: Divide the water flow section of the double-layer surrounding straight-curved ramp structure and determine the pouring sequence of the horizontal and vertical structures of each section; S4. Use the BIM model to simulate the layout of pipelines and sprinkler pipes so that the clear height of the ramp route meets the design requirements.

2. The method for constructing a double-layer surrounding straight-curved mixed automobile ramp according to claim 1, characterized in that: In step S1, the double-layer surrounding straight-curved mixed ramp is modeled using BIM, and the ramp coordinate positioning and elevation layout are completed using the RTK surveying instrument, including: S11, using BIM technology to perform 1:1 modeling of the double-layer surrounding straight-curved mixed ramp, and directly picking the coordinates and relative elevations of each part in the built BIM model; S12, exporting drawings with elevations and coordinates from the BIM model, transmitting them to the RTK surveying instrument for precise layout of the structure, and completing the ramp coordinate positioning and elevation layout.

3. The method for constructing a double-layer surrounding straight-curved mixed automobile ramp according to claim 1, characterized in that: In step S2, the construction of the curved wall formwork for the car ramp includes: using BIM technology on site to model the outer wall of the double-layer ramp, drawing the actual position of each formwork in the BIM model and numbering it, finding the three-dimensional coordinates of the four corners of the corresponding numbered template in the BIM model, and inputting the three-dimensional coordinates into the total station to accurately position each template.

4. The method for constructing a double-layer surrounding straight-curved mixed automobile ramp according to claim 3 is characterized in that: The curved wall formwork adopts 15mm thick multi-layer board, and the main keel reinforced by the formwork is pre-bent in advance according to the BIM model layout. The secondary keel and the main keel are fixed to the curved wall formwork with tension bolts. The main keel adopts two C22 steel bars with a spacing of 500mm, and the secondary keel adopts 50×50 steel-wood keel with a spacing of 250mm. Multiple tension bolts are evenly spaced along the direction of the main keel with a spacing of 500mm. Steel bars are reserved on the bottom plate, and the side formwork support is directly diagonally braced to the reserved steel bars of the ramp bottom plate, and is set at 45° to the ramp bottom plate.

5. The construction method of a double-layer surrounding straight-curved hybrid automobile ramp according to claim 1 is characterized in that: In step S3, the water flow section of the double-layer surrounding straight-curve ramp structure is divided into three sections, including a first ramp section, a second ramp section and a third ramp section, wherein the first ramp section is a double-layer straight structure, and the upper and lower positional relationship between the third ramp and the first ramp, the fourth ramp and the second ramp remains unchanged, wherein the first ramp is completely located below the third ramp, and the second ramp is completely located below the fourth ramp; the second ramp section is a double-layer curved structure, and on the basis of the first ramp section, the first ramp and the second ramp are first horizontally displaced and then vertically displaced, so that the first ramp and the second ramp respectively surround the third ramp and the fourth ramp and rise; the third ramp section is a single-layer straight structure, and the first ramp and the second ramp are parallel to the ramp entrances of the third ramp and the fourth ramp, respectively, and the ramp bottom elevations are the same elevation.

6. The method for constructing a double-layer surrounding straight-curved hybrid automobile ramp according to claim 5, characterized in that: The pouring sequence of the first section of the ramp is: The first pouring is at 300mm on both sides of the first ramp / second ramp, with waterstop steel plates installed inside; the second pouring is at the connection between the walls on both sides of the first ramp / second ramp and the ground of the third ramp / fourth ramp, with waterstop strips installed inside; after the waterproofing construction and backfill construction of the walls and ground on both sides of the first ramp / second ramp are completed, the third pouring will start, and the third pouring is at 300mm on both sides of the third ramp / fourth ramp, with waterstop steel plates installed inside; the fourth pouring is the walls and top plate of the third ramp / fourth ramp.

7. The method for constructing a double-layer surrounding straight-curved hybrid automobile ramp according to claim 6, characterized in that: The first pouring sequence of the second section of the ramp is: the pouring sequence when the first ramp is horizontally displaced relative to the third ramp, and the second ramp is horizontally displaced relative to the fourth ramp, including: the first pouring of the first ramp / second ramp at 300mm on both sides of the ground, with waterstop steel plates installed inside; the second pouring of the connection between the walls on both sides of the ground of the first ramp / second ramp and the ground of the third ramp / fourth ramp, with waterstop strips installed inside; the third pouring begins after the waterproofing construction of the walls and ground on both sides of the first ramp / second ramp and the backfill construction are completed; the third pouring of the third ramp / fourth ramp at 300mm on both sides of the ground, with waterstop steel plates installed inside; the fourth pouring of the walls and top plate of the third ramp / fourth ramp.

8. The method for constructing a double-layer surrounding straight-curved hybrid automobile ramp according to claim 7, characterized in that: The second pouring sequence of the second section of the ramp is: the pouring sequence when the vertical displacement starts after the horizontal displacement of the first ramp / second ramp is completed, including: the first pouring of the first ramp / second ramp on both sides of the ground 300mm up, with a waterstop steel plate inside; the second pouring of the outdoor wall on the inner side of the first ramp / second ramp, where the wall height decreases as the ramp height increases, and when the wall height is less than 300mm, the waterstop steel plate is replaced by a waterstop strip; after the waterproofing construction of the walls and ground on both sides of the first ramp / second ramp and the backfill construction are completed, the third pouring begins, and the The third ramp / fourth ramp is poured three times, 300mm up on the outside of the ground, and a waterstop steel plate is installed on the outside; the first ramp / second ramp is poured for the fourth time, the indoor wall on the inside, where the wall height increases with the increase of the ramp elevation; the first ramp / second ramp is poured for the fifth time, the outer wall and the top of the ramp are poured, 300mm up on the inside of the top, and a waterstop steel plate is installed. Here, the height of the upper wall decreases with the increase of the ramp elevation, and when the height is less than 300mm, the waterstop steel plate is changed to a waterstop strip; the third ramp / fourth ramp side wall and top plate are poured for the sixth time.

9. The method for constructing a double-layer surrounding straight-curved hybrid automobile ramp according to claim 8, characterized in that: The pouring sequence of the third section of the ramp is: the pouring sequence when the bottom elevations of the first ramp, the third ramp, the second ramp and the fourth ramp are at the same elevation, including: the first pouring of the first ramp, the third ramp, the second ramp and the fourth ramp bottom, and setting a waterstop steel plate 300mm outside the side wall; the second pouring of the first ramp, the third ramp, the second ramp and the fourth ramp walls; after the structural columns on the upper first ramp and second ramp side walls are completed, the third pouring of the first ramp and the second ramp top.

10. The construction method of a double-layer surrounding straight-curved hybrid automobile ramp according to claim 1, characterized in that: In step S4, the BIM model is used to simulate the arrangement of pipelines and sprinkler pipes so that the net height of the ramp driving route meets the design requirements, including: using the BIM model to simulate the arrangement of pipelines and sprinkler pipes so that the net height in the middle of the ramp meets the design requirements, and at the same time, the original sprinkler pipe upward spraying form is optimized to a side-outlet upward spraying form, and the height of the sprinkler pipe is increased by 180mm-200mm.

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