Large deep foundation pit horizontal support system coordination optimization raft and construction method

Abstract

The present application relates to large deep foundation pit horizontal bracing system coordination optimization raft and construction method, including the following steps: step one, the installation of large deep foundation pit horizontal bracing; Step two, whole body type steel pipe column connection construction; Step three, the construction of the hoop push-pull type connecting column support and adjustable slope connection end; Step four, the installation construction of large longitudinal slope inclined plane steel trestle; Step five, large deep foundation pit bracing demolition construction.The present application relates to large deep foundation pit horizontal bracing system coordination optimization raft construction method, aiming at large deep foundation pit adopts multi-channel horizontal bracing coordination optimization technology, combined with integral angle support, makes steel trestle form traffic closed loop, enhances the stability of support system, optimizes construction traffic organization, improves construction efficiency; Adopt large longitudinal slope reinforced steel trestle technology, significantly improves the stability and safety of steel trestle, whole body type steel pipe column enhances the overall rigidity of structure, effectively deals with the horizontal component force brought by large longitudinal slope.

Description

Technical Field

[0001] The present invention relates to a collaboratively optimized raft slab and construction method for a large-scale deep foundation pit horizontal support system, belonging to the field of foundation pit engineering technology. The invention is suitable for large-scale deep foundation pit projects such as high-rise buildings, subway stations, and underground complexes, for safe construction under complex geological conditions such as soft soil and high water levels, as well as for green building projects that require a balance between support safety and raft slab construction efficiency. Background Art

[0002] With the expansion of urban underground space development, deep foundation pit projects are facing challenges such as complex geological conditions and sensitive surrounding environments. Traditional deep foundation pit support often adopts a model of step-by-step design and construction of a horizontal support system (steel / concrete support) and a raft foundation: the support system is only a temporary structure and is removed layer by layer after the raft is poured. This model has significant defects: (1) poor structural coordination, the support system is separated from the raft load path, resulting in redundant support or excessive raft reinforcement; (2) long construction period, the support installation and removal are carried out alternately with the raft pouring, and the increase in cross-processing affects the construction period; (3) high safety risk, in soft soil or high water level strata, the support removal is likely to cause foundation pit rebound deformation, threatening the structural integrity of the raft. Therefore, in order to meet the needs of engineering construction, improve the construction quality and efficiency of large deep foundation pits, and reduce construction costs and risks, it is urgent to research and develop a construction method suitable for large deep foundation pits with horizontal support systems that can coordinate and optimize the raft. Summary of the Invention

[0003] The purpose of the present invention is to address the problems existing in the construction of large deep foundation pits and provide a collaborative optimization raft construction method for the horizontal support system of a large deep foundation pit. This method will achieve the smooth construction of suspended protection of deep-buried pipelines in deep foundation pit projects through multi-channel horizontal support collaborative optimization technology, through-body steel pipe column connection technology, clamp push-pull connection column support technology, adjustable slope connection end and large longitudinal slope inclined steel trestle installation technology.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] The construction method of the large deep foundation pit horizontal support system collaboratively optimizes the raft slab, including the following steps:

[0006] Step 1. Installation of horizontal supports for large deep foundation pits: When constructing horizontal supports, first simultaneously construct the first integral angle brace, the first integral angle brace reinforcement connection belt, the second integral angle brace, the second integral angle brace reinforcement connection belt, the third integral angle brace, the third integral angle brace reinforcement connection belt, the fourth integral angle brace, and the fourth integral angle brace reinforcement connection belt at the four corners of the large deep foundation pit. Then, simultaneously construct the first pair of braces, the second pair of braces, the third pair of braces, the fourth pair of braces, and then the fifth pair of braces.

[0007] Step 2: Construction of full-body steel pipe column connection: hoist the anti-pullout pile reinforcement and steel pipe column to the designed position along the large longitudinal slope direction, connect the vertical reinforcement on the anti-pullout pile reinforcement, set the lower part of the steel pipe column with a lower connecting fixed reinforcement, the lower connecting fixed reinforcement is connected to the vertical reinforcement, and the side of the steel pipe column is connected to the vertical reinforcement through the side connecting fixed reinforcement. Then, use the pile column construction work platform to pour the anti-pullout pile concrete to the position above the side connecting fixed reinforcement, so that the steel pipe column and the anti-pullout pile form a full-body connection;

[0008] Step 3: Construction of inter-column support with clamp push-pull connection and adjustable sloped connection end: Along the direction of the large longitudinal slope, the steel pipe column is reinforced and connected into a whole through the first clamp push-pull connection piece, the second clamp push-pull connection piece, and the inter-column connection cross brace; then the adjustable sloped connection end is installed on the top of the steel pipe column;

[0009] Step 4: Installation and construction of the large longitudinal slope steel trestle;

[0010] Step 5: Dismantling construction of large deep foundation pit supports.

[0011] Preferably, in step three, for a single row of steel pipe columns, the installation method of the adjustable sloped connection end is as follows: a limiting channel steel and a transverse load-bearing beam are installed on the top of the steel pipe column, a bottom support plane plate is installed on the transverse load-bearing beam, a clamping device is installed at the lower end of the bottom support plane plate, the clamping device clamps the steel pipe column, a supporting inclined beam is installed on the upper part of the bottom support plane plate, a lifting rod is connected to the left side of the upper part of the bottom support plane plate, the end of the supporting inclined beam close to the lifting rod is the telescopic part of the supporting inclined beam, and the telescopic part of the supporting inclined beam is arranged at the upper end of the lifting rod; the height of the lifting rod is adjusted to control the inclination angle of the supporting inclined beam; for a double row of steel pipe columns, first install the longitudinal load-bearing beam on the upper part of the double row of steel pipe columns, and then install the adjustable sloped connection end in the same way in the middle part of the longitudinal load-bearing beam.

[0012] Preferably, the ends of the inter-column connecting cross braces are provided with first clamp push-pull connectors or second clamp push-pull connectors;

[0013] The first clamp push-pull connector includes a first clamp body, a first corner hinge, a first opening and closing rotating rod, a first pair of tight flexible pads, and a first retractable bayonet. The first clamp body is U-shaped, and the first opening and closing rotating rods are respectively provided at both ends of the first clamp body. The first clamp body is connected to one end of the first opening and closing rotating rod through the first corner hinge, and the other end of the first opening and closing rotating rod is equipped with a first pair of tight flexible pads. The two first opening and closing rotating rods on the first clamp body are clamped and connected by the first retractable bayonet.

[0014] The second clamp push-pull connector includes a second clamp body, a second corner hinge, a second tight flexible pad, a second opening and closing rotating rod, and a second retractable bayonet. The second clamp body is annular, and second corner hinges are respectively provided on both sides of the second clamp body. The second clamp body is connected to one end of the second opening and closing rotating rod through the second corner hinge, and the other end of the second opening and closing rotating rod is equipped with a second tight flexible pad. The two second opening and closing rotating rods on the second clamp body are clamped and connected by a second retractable bayonet.

[0015] Preferably, the specific method of step four is as follows: after the adjustable slope connection end is installed, the Bailey beam, limiter, H-shaped channel steel, bridge deck anti-slip steel plate, and guardrail are installed in sequence from bottom to top above the adjustable slope connection end.

[0016] Preferably, the specific method of step five is as follows: when dismantling the support of a large deep foundation pit, the steel trestle is divided into two parts: dismantling the steel trestle first and dismantling the steel trestle later. The steel trestle is dismantled first, and then the first integral angle brace, the first integral angle brace reinforced connecting belt, the second integral angle brace, the second integral angle brace reinforced connecting belt, the third integral angle brace, the third integral angle brace reinforced connecting belt, the fourth integral angle brace, and the fourth integral angle brace reinforced connecting belt at the four corners are dismantled, and then the first pair of supports, the third pair of supports, the fourth pair of supports, the fifth pair of supports, and then the steel trestle is dismantled.

[0017] Preferably, in step 2, the connecting vertical reinforcement is welded to the pull-out pile reinforcement through spaced welding points.

[0018] The large-scale deep foundation pit horizontal support system collaboratively optimizes the raft slab, which is constructed by the large-scale deep foundation pit horizontal support system collaboratively optimizes the raft slab construction method.

[0019] The present invention has the following characteristics and beneficial effects:

[0020] (1) The present invention adopts multi-level support collaborative optimization technology for large deep foundation pits, combined with integral angle bracing, so that the steel trestle forms a traffic closed loop, enhances the stability of the support system, optimizes construction traffic organization, and improves construction efficiency.

[0021] (2) The present invention adopts the technology of reinforced steel trestle with large longitudinal slope. Through the structure of full-body steel pipe column + anti-skid steel trestle with large longitudinal slope, the stability and safety of the steel trestle are significantly improved. The full-body steel pipe column enhances the overall rigidity of the structure and effectively copes with the horizontal force caused by the large longitudinal slope. The anti-skid steel trestle structure further enhances the anti-skid performance of the steel trestle under complex working conditions by optimizing the connection method and increasing the friction force.

[0022] (3) The present invention adopts the technology of push-pull connection between columns, and realizes the closing of the opening and closing rotating rod through the elastic bayonet, thereby effectively strengthening the integrity between the steel pipe column and the cross brace between the columns.

[0023] (4) The present invention adopts an adjustable slope-type connecting end, and strengthens the connection between the adjustable slope-type connecting end and the steel pipe column through a clamping device. By adjusting the rotary lifter, the lifting rod is raised and lowered, thereby controlling the slope angle of the supporting slope beam, which facilitates the subsequent installation and construction of the Bailey beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the collaborative optimization structure of multiple horizontal supports;

[0025] Figure 2 It is the overall elevation drawing of the through-type steel pipe column;

[0026] Figure 3 This is the connection detail drawing at A;

[0027] Figure 4 This is a schematic diagram of the structure of a reinforced steel trestle with a large longitudinal slope;

[0028] Figure 5 1 is a schematic diagram of the structure of the first clamp push-pull connector;

[0029] Figure 6 1 is a schematic diagram of the structure of the second clamp push-pull connector;

[0030] Figure 7 It is an adjustable slope type connection end;

[0031] Figure 8 This is a detailed drawing of the installation structure of the large longitudinal slope steel trestle.

[0032] In the figure: 1-steel trestle, 2-first integral angle brace, 3-first integral angle brace reinforced connecting strip, 4-second integral angle brace, 5-second integral angle brace reinforced connecting strip, 6-third integral angle brace, 7-third integral angle brace reinforced connecting strip, 8-fourth integral angle brace, 9-fourth integral angle brace reinforced connecting strip, 10-first pair of braces, 11-second pair of braces, 12-third pair of braces, 13-fourth pair of braces, 14-fifth pair of braces, 15-rear dismantling steel trestle, 16-rear dismantling steel trestle reinforced connecting rib, 17-steel pipe column, 18-pull-out pile, 19-pile column construction platform, 20-pull-out pile steel bar, 21-pull-out pile concrete, 22-connecting vertical bars, 23-side connecting fixed steel bars, 24-lower connecting fixed steel bars, 25-welding point, 26-large longitudinal slope direction, 27-first hoop push-pull Type connector, 28-first hoop body, 29-first corner hinge, 30-first opening and closing rotating rod, 31-first tight flexible pad, 32-first retractable bayonet, 33-second hoop push-pull connector, 34-second hoop body, 35-second corner hinge, 36-second tight flexible pad, 37-second opening and closing rotating rod, 38-second retractable bayonet, 39-limiting channel steel, 40-transverse load-bearing beam, 41-clamping device, 42-bottom supporting plane plate, 43-supporting inclined beam, 44-supporting inclined beam telescopic part, 45-lifting rod, 46-rotary lifter, 47-inter-column connecting cross brace, 48-adjustable slope-type connecting end, 49-longitudinal load-bearing beam, 50-Bailey beam, 51-limiter, 52-H-type channel steel, 53-bridge deck anti-slip steel plate, 54-guardrail. DETAILED DESCRIPTION

[0033] The present invention focuses on the embodiments of the present invention, and the present invention is further described in detail below with reference to the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of the collaborative optimization structure of multiple horizontal supports. Figure 2 This is the overall elevation drawing of the full-body steel pipe column. Figure 3 This is the connection detail diagram at A. Figure 4 This is a schematic diagram of the structure of a reinforced steel trestle with a large longitudinal slope. Figure 5 This is a schematic diagram of the first clamp push-pull connector structure. Figure 6 This is a schematic diagram of the second clamp push-pull connector structure. Figure 7 It is an adjustable slope connection end. Figure 8 This is a detailed drawing of the steel trestle installation structure, refer to Figures 1-8 shown.

[0035] The large-scale deep foundation pit horizontal support system coordinates and optimizes the raft construction method. During construction, a horizontal support coordination system, a one-piece steel pipe column connection system, a clamp push-pull connection column support system, an adjustable slope connection end 48 and a large longitudinal slope inclined steel trestle installation system are adopted.

[0036] The horizontal support coordination system includes steel trestle 1, first integral corner brace 2, first integral corner brace reinforcing connection belt 3, second integral corner brace 4, second integral corner brace reinforcing connection belt 5, third integral corner brace 6, third integral corner brace reinforcing connection belt 7, fourth integral corner brace 8, fourth integral corner brace reinforcing connection belt 9, first pair of braces 10, second pair of braces 11, third pair of braces 12, fourth pair of braces 13, fifth pair of braces 14, rear dismantling steel trestle 15, rear dismantling steel trestle reinforcing connection rib 16. When the multi-channel horizontal support coordination optimization system is constructed, the first integral corner brace 2, the first integral corner brace reinforcing connection belt 3, the second integral corner brace 4, the second integral corner brace reinforcing connection belt 5, the third integral corner brace 6, the third integral corner brace reinforcing connection belt 7, the fourth integral corner brace 8, and the fourth integral corner brace reinforcing connection belt 9 at the four corners of the large deep foundation pit are constructed synchronously first, then the first pair of braces 10, the second pair of braces 11, the third pair of braces 12, and the fourth pair of braces 13 at the outermost two sides in the short side direction of the large deep foundation pit are constructed synchronously, then the fifth pair of braces 14 in the middle of the short side direction of the large deep foundation pit is constructed, and finally the steel trestle 1, the rear dismantling steel trestle 15, and the rear dismantling steel trestle reinforcing connection rib 16 are constructed. When the large deep foundation pit support is dismantled, the steel trestle 1 is divided into a first dismantling steel trestle and a rear dismantling steel trestle 15, the first dismantling steel trestle is removed first, then the first integral corner brace 2, the first integral corner brace reinforcing connection belt 3, the second integral corner brace 4, the second integral corner brace reinforcing connection belt 5, the third integral corner brace 6, the third integral corner brace reinforcing connection belt 7, the fourth integral corner brace 8, and the fourth integral corner brace reinforcing connection belt 9 at the four corners are removed, and then the support is removed from both ends to the middle, that is, the first pair of braces 10, the third pair of braces 12, the fourth pair of braces 13, the fifth pair of braces 14, the rear dismantling steel trestle 15, and the rear dismantling steel trestle reinforcing connection rib 16 are sequentially removed, and the first pair of braces 10, the third pair of braces 12, the fourth pair of braces 13, the fifth pair of braces 14, the rear dismantling steel trestle 15, and the rear dismantling steel trestle reinforcing connection rib 16 are used as a reserved area for partial dismantling and are used as a supporting construction site at the same time. After the basement roof of other areas is constructed and the supporting construction site is transferred, the reserved area is removed.

[0037] As Figure 3As shown, the full-body steel pipe column connection system includes a steel pipe column 17, an anti-pull pile 18, a pile column construction work platform 19, an anti-pull pile steel bar 20, an anti-pull pile concrete 21, a side connecting fixing steel bar 23, and a lower connecting fixing steel bar 24. The anti-pull pile steel bar 20 and the steel pipe column 17 are hoisted to the designed position along the large longitudinal slope direction 26. The anti-pull pile steel bar 20 is connected with a connecting vertical bar 22. The lower part of the steel pipe column 17 is provided with a lower connecting fixing steel bar 24. The lower connecting fixing steel bar 24 is connected to the connecting vertical bar 22. The side of the steel pipe column 17 is connected to the connecting vertical bar 22 through the side connecting fixing steel bar 23. The connecting vertical bar 22 is welded to the anti-pull pile steel bar 20 through spaced welding points 25. Then, the pile column construction work platform 19 is used to pour the anti-pull pile concrete 21 of the anti-pull pile 18 to the position above the side connecting fixing steel bar 23, so that the steel pipe column 17 and the anti-pull pile 18 form a full-body connection.

[0038] The inter-column support system with a clamp push-pull connection includes steel pipe columns 17, first clamp push-pull connectors 27, second clamp push-pull connectors 33, and inter-column connecting cross braces 47. The ends of the inter-column connecting cross braces 47 are provided with first clamp push-pull connectors 27 or second clamp push-pull connectors 33. Along the direction of the large longitudinal slope 26, the first clamp push-pull connectors 27, second clamp push-pull connectors 33, and inter-column connecting cross braces 47 reinforce and connect the steel pipe columns 17 into a single unit.

[0039] The first clamp push-pull connector 27 includes a first clamp body 28, a first corner hinge 29, a first opening and closing rotating rod 30, a first tightening flexible pad 31, and a first retractable bayonet 32. The first clamp body 28 is "U"-shaped, and the first opening and closing rotating rods 30 are respectively provided at both ends of the first clamp body 28. The first clamp body 28 is connected to one end of the first opening and closing rotating rod 30 through the first corner hinge 29, and the other end of the first opening and closing rotating rod 30 is equipped with a first tightening flexible pad 31. The two first opening and closing rotating rods 30 on the first clamp body 28 are clamped and connected by the first retractable bayonet 32.

[0040] The second clamp push-pull connector 33 includes a second clamp body 34, a second corner hinge 35, a second tightening flexible pad 36, a second opening and closing rotating rod 37, and a second retractable bayonet 38. The second clamp body 34 is annular, and a second corner hinge 35 is provided on both sides of the second clamp body 34. The second clamp body 34 is connected to one end of the second opening and closing rotating rod 37 through the second corner hinge 35. The other end of the second opening and closing rotating rod 37 is equipped with a second tightening flexible pad 36. The two second opening and closing rotating rods 37 on the second clamp body 34 are clamped and connected by a second retractable bayonet 38.

[0041] The adjustable sloped connection end 48 includes a steel pipe column 17, a limiting channel steel 39, a transverse load-bearing beam 40, a clamping device 41, a bottom support plane plate 42, a supporting inclined beam 43, a supporting inclined beam telescopic portion 44, a lifting rod 45, a rotary lifter 46, and a longitudinal load-bearing beam 49. For a single row of steel pipe columns 17, the installation method of the adjustable sloped connection end 48 is as follows: the limiting channel steel 39 and the transverse load-bearing beam 40 are installed on the top of the steel pipe column 17, and the bottom support plane plate 42 is installed on the transverse load-bearing beam 40. The bottom support plane plate 42 is provided with a clamping device 41 at its lower end, which clamps the steel pipe column 17. A support inclined beam 43 is installed on the top of the bottom support plane plate 42. A lifting rod 45 is connected to the left side of the top of the bottom support plane plate 42. The end of the support inclined beam 43 near the lifting rod 45 is a telescopic portion 44 of the support inclined beam. This portion 44 is adjustable and is located at the top end of the lifting rod 45. The height of the lifting rod 45 can be adjusted by adjusting the rotary lifter 46 on the right side of the lifting rod 45, thereby controlling the inclination angle of the support inclined beam 43. For the double-row steel pipe columns 17, a longitudinal load-bearing beam 49 is first installed on the top of the double-row steel pipe columns 17. Then, an adjustable sloped connection end 48 is installed in the same manner in the middle of the longitudinal load-bearing beam 49.

[0042] The installation system of the large longitudinal slope inclined steel trestle includes a supporting inclined beam 43, an adjustable slope-type connecting end 48, a longitudinal load-bearing beam 49, a Bailey beam 50, a limiter 51, an H-shaped channel steel 52, a bridge deck anti-skid steel plate 53, and a guardrail 54. After the installation of the adjustable slope-type connecting end 48 is completed, it is installed in sections on the supporting inclined beam 43 as the excavation progresses, and the Bailey beam 50, the limiter 51, the H-shaped channel steel 52, the bridge deck anti-skid steel plate 53, and the guardrail 54 are installed in sequence from bottom to top.

[0043] The construction method of the large deep foundation pit horizontal support system collaboratively optimizes the raft slab, including the following steps:

[0044] Step 1. Installation of horizontal supports for large deep foundation pits: During the horizontal support construction, first synchronously construct the first integral angle support 2, the first integral angle support reinforcement connecting belt 3, the second integral angle support 4, the second integral angle support reinforcement connecting belt 5, the third integral angle support 6, the third integral angle support reinforcement connecting belt 7, the fourth integral angle support 8, and the fourth integral angle support reinforcement connecting belt 9 at the four corners of the large deep foundation pit, and then synchronously construct the outermost pair of supports in the short side direction of the large deep foundation pit, which include the first pair of supports 10, the second pair of supports 11, the third pair of supports 12, and the fourth pair of supports 13, and then construct the fifth pair of supports 14 in the middle of the short side direction.

[0045] Step two, the whole body steel pipe column 17 connection construction: along the large longitudinal slope direction 26, the uplift pile steel bar 20, the steel pipe column 17 are hoisted to the design position, the uplift pile steel bar 20 is connected with the connecting vertical reinforcement 22, the lower part of the steel pipe column 17 is provided with the lower connecting fixed reinforcement 24, the lower connecting fixed reinforcement 24 is connected with the connecting vertical reinforcement 22, the side of the steel pipe column 17 is connected with the connecting vertical reinforcement 22 through the side connecting fixed reinforcement 23, the connecting vertical reinforcement 22 is welded and connected with the uplift pile steel bar 20 through the interval welding point 25, then the uplift pile concrete 21 of the uplift pile 18 is poured to the position above the side connecting fixed reinforcement 23 by using the pile column construction platform 19, so that the steel pipe column 17 and the uplift pile 18 form the whole body connection.

[0046] Step three, the hoop push-pull type connection column support and adjustable slope type connection end 48 construction: along the large longitudinal slope direction 26, the steel pipe column 17 is strengthened and connected into a whole body through the first hoop push-pull type connecting piece 27, the second hoop push-pull type connecting piece 33 and the inter-column connecting cross brace 47; then the adjustable slope type connection end 48 is installed at the top of the steel pipe column 17; wherein, for the single row steel pipe column 17, the installation method of the adjustable slope type connection end 48 is as follows: the limiting channel steel 39 and the transverse bearing beam 40 are installed at the top of the steel pipe column 17, the bottom support flat plate 42 is installed on the transverse bearing beam 40, the lower end of the bottom support flat plate 42 is installed with the clamping device 41, the clamping device 41 clamps the steel pipe column 17, the support inclined beam 43 is installed on the upper part of the bottom support flat plate 42, the left side of the upper part of the bottom support flat plate 42 is connected with the lifting rod 45, the end of the support inclined beam 43 close to the lifting rod 45 is the support inclined beam telescopic part 44, the support inclined beam telescopic part 44 can be adjusted in extension and contraction, and the support inclined beam telescopic part 44 is arranged at the upper end of the lifting rod 45; the height of the lifting rod 45 can be adjusted through the rotary lifter 46 on the right side of the lifting rod 45, so as to control the inclination angle of the support inclined beam 43; for the double row steel pipe column 17, the longitudinal bearing beam 49 is first installed on the upper part of the double row steel pipe column 17, and then the adjustable slope type connection end 48 is installed on the middle part of the longitudinal bearing beam 49 in the same way.

[0047] Step four, the large longitudinal slope inclined plane steel trestle installation construction: after the adjustable slope type connection end 48 is installed, the support inclined beam 43 is installed in sections along with the earth excavation progress, the Bailey beam 50, the limiter 51, the H-shaped channel steel 52, the bridge deck anti-skid steel plate 53 and the guardrail 54 are sequentially installed from bottom to top above the adjustable slope type connection end 48.

[0048] Step 5. Dismantling construction of large deep foundation pit supports: When dismantling large deep foundation pit supports, divide the steel trestle 1 into two parts: first dismantling the steel trestle and then dismantling the steel trestle 15. Dismantle the steel trestle first, then dismantle the first integral angle brace 2, the first integral angle brace reinforced connecting belt 3, the second integral angle brace 4, the second integral angle brace reinforced connecting belt 5, the third integral angle brace 6, the third integral angle brace reinforced connecting belt 7, the fourth integral angle brace 8, and the fourth integral angle brace reinforced connecting belt 9 at the four corners, and then dismantle the supports from both ends to the middle, that is, dismantle the first pair of supports 10, the third pair of supports 12, the fourth pair of supports 13, the fifth pair of supports 14, and then dismantle the steel trestle 15.

Claims

1. A method for collaboratively optimizing the construction of raft slabs using a horizontal support system for a large deep foundation pit, characterized in that: The following steps are involved: Step 1. Installation of horizontal supports for large deep foundation pits: When constructing horizontal supports, first, simultaneously construct the first integral angle support (2), the first integral angle support reinforcement connection belt (3), the second integral angle support (4), the second integral angle support reinforcement connection belt (5), the third integral angle support (6), the third integral angle support reinforcement connection belt (7), the fourth integral angle support (8), and the fourth integral angle support reinforcement connection belt (9) at the four corners of the large deep foundation pit, and then simultaneously construct the first pair of supports (10), the second pair of supports (11), the third pair of supports (12), and the fourth pair of supports (13), and then construct the fifth pair of supports (14); Step 2, connection construction of the full-body steel pipe column (17): hoist the anti-pull pile reinforcement (20) and the steel pipe column (17) to the designed position along the large longitudinal slope direction (26), connect the vertical reinforcement (22) on the anti-pull pile reinforcement (20), and set the lower part of the steel pipe column (17) with a lower connecting fixed reinforcement (24), which is connected to the vertical reinforcement (22). The side of the steel pipe column (17) is connected to the vertical reinforcement (22) through the side connecting fixed reinforcement (23), and then use the pile construction work platform (19) to pour the anti-pull pile concrete (21) of the anti-pull pile (18) to the position above the side connecting fixed reinforcement (23), so that the steel pipe column (17) and the anti-pull pile (18) form a full-body connection; Step 3: Construction of the inter-column support with a hoop push-pull connection and the adjustable sloped connection end (48): Along the direction of the large longitudinal slope (26), the steel pipe column (17) is reinforced and connected into a whole through the first hoop push-pull connection piece (27), the second hoop push-pull connection piece (33), and the inter-column connection cross brace (47); then, the adjustable sloped connection end (48) is installed on the top of the steel pipe column (17); Step 4: Installation and construction of the large longitudinal slope steel trestle (1); Step 5: Large deep foundation pit support dismantling construction.

2. The method for collaboratively optimizing the construction of raft slabs using a horizontal support system for a large deep foundation pit according to claim 1, characterized in that: In step 3, for a single row of steel pipe columns (17), the installation method of the adjustable sloped connection end (48) is as follows: a limit channel steel (39) and a transverse load-bearing beam (40) are installed on the top of the steel pipe column (17), a bottom support plane plate (42) is installed on the transverse load-bearing beam (40), a clamping device (41) is installed at the lower end of the bottom support plane plate (42), the clamping device (41) clamps the steel pipe column (17), a support inclined beam (43) is installed on the upper part of the bottom support plane plate (42), and the upper left side of the bottom support plane plate (42) is connected The lifting rod (45) has an end of the supporting inclined beam (43) close to the lifting rod (45) as a supporting inclined beam telescopic portion (44), and the supporting inclined beam telescopic portion (44) is arranged at the upper end of the lifting rod (45); the inclined angle of the supporting inclined beam (43) is controlled by adjusting the height of the lifting rod (45); for the double-row steel pipe column (17), the longitudinal load-bearing beam (49) is first installed on the upper part of the double-row steel pipe column (17), and then the adjustable slope-type connecting end (48) is installed in the middle part of the longitudinal load-bearing beam (49) in the same way.

3. The method for collaboratively optimizing the construction of a raft slab using a horizontal support system for a large deep foundation pit according to claim 1, characterized in that: The end of the inter-column connecting cross brace (47) is provided with a first clamp push-pull connector (27) or a second clamp push-pull connector (33); The first clamp push-pull connector (27) includes a first clamp body (28), a first corner hinge (29), a first opening and closing rotating rod (30), a first pair of tight flexible pads (31), and a first retractable bayonet (32). The first clamp body (28) is U-shaped. The first opening and closing rotating rods (30) are respectively provided at both ends of the first clamp body (28). The first clamp body (28) is connected to one end of the first opening and closing rotating rod (30) through the first corner hinge (29). The other end of the first opening and closing rotating rod (30) is provided with a first pair of tight flexible pads (31). The two first opening and closing rotating rods (30) on the first clamp body (28) are clamped and connected via the first retractable bayonet (32). The second hoop push-pull connector (33) comprises a second hoop body (34), a second corner hinge (35), a second tight flexible pad (36), a second opening and closing rotating rod (37), and a second retractable bayonet (38). The second hoop body (34) is annular, and second corner hinges (35) are respectively provided on both sides of the second hoop body (34). The second hoop body (34) is connected to one end of the second opening and closing rotating rod (37) through the second corner hinge (35). The other end of the second opening and closing rotating rod (37) is provided with a second tight flexible pad (36). The two second opening and closing rotating rods (37) on the second hoop body (34) are clamped and connected through the second retractable bayonet (38).

4. The method for collaboratively optimizing the construction of a raft slab using a horizontal support system for a large deep foundation pit according to claim 1, characterized in that: The specific method of step 4 is as follows: after the adjustable slope type connection end (48) is installed, the Bailey beam (50), the limiter (51), the H-shaped channel steel (52), the bridge deck anti-skid steel plate (53), and the guardrail (54) are installed in order from bottom to top above the adjustable slope type connection end (48).

5. The method for collaboratively optimizing the construction of raft slabs using a horizontal support system for a large deep foundation pit according to claim 1, characterized in that: The specific method of step five is as follows: when dismantling the support of a large deep foundation pit, the steel trestle (1) is divided into two parts: first dismantling the steel trestle and then dismantling the steel trestle (15). The first steel trestle is dismantled first, and then the first integral angle brace (2), the first integral angle brace reinforcement connection belt (3), the second integral angle brace (4), the second integral angle brace reinforcement connection belt (5), the third integral angle brace (6), the third integral angle brace reinforcement connection belt (7), the fourth integral angle brace (8), and the fourth integral angle brace reinforcement connection belt (9) at the four corners are dismantled. Then, the first pair of braces (10), the third pair of braces (12), the fourth pair of braces (13), and the fifth pair of braces (14) are dismantled, and finally the steel trestle (15) is dismantled.

6. The method for collaboratively optimizing the construction of a raft slab using a horizontal support system for a large deep foundation pit according to claim 1, characterized in that: In step 2, the connecting vertical reinforcement (22) is welded to the anti-pull pile reinforcement (20) through the spaced welding points (25).

7. The horizontal support system of large deep foundation pit is collaboratively optimized for raft slabs, characterized by: The large-scale deep foundation pit horizontal support system according to any one of claims 1 to 6 is constructed by collaboratively optimizing the raft construction method.

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