Steel sheet pile support profile steel diagonal bracing reinforced revetment close to deep foundation pit of river channel and construction method

Abstract

The invention relates to a steel sheet pile supporting profile steel diagonal bracing reinforcing revetment close to a river channel deep foundation pit and a construction method. The construction method comprises the following specific steps that firstly, construction preparation is conducted; secondly, a new stand column foundation is poured; 3, construction of a stand column pier; fourthly, the profile steel stand columns are installed, specifically, the profile steel stand columns are installed on the embedded parts of the new stand column foundation, and stand column bottom plates are connected with the embedded parts through ground anchor bolts; fifthly, the profile steel enclosing purlins are installed; sixthly, profile steel supports are installed; seventhly, steel sheet piles are driven; eighthly, retaining walls are installed; ninthly, backfilling soil construction is conducted; and tenthly, the main body foundation pit is constructed. The structural steel diagonal bracings are arranged between the revetments on the two sides of the river channel, the retaining force of the revetment close to one side of the deep foundation pit and the retaining force of the soil body are transmitted to the revetment close to the other side of the deep foundation pit and the retaining force of the soil body through the structural steel diagonal bracings, the revetment close to the side of the deep foundation pit and the retaining force of the soil body are prevented from being integrally pushed to the river channel, and the stress unbalance loading problem is effectively solved.

Description

Technical Field

[0001] The present invention relates to a steel sheet pile supporting steel bracing reinforcement revetment and a construction method for a deep foundation pit adjacent to a river channel, and is mainly suitable for engineering constructions where a deep foundation pit needs to be excavated on the river channel side, the soil and revetment on the river channel side cannot provide sufficient retaining force for supporting the deep foundation pit, and the river channel revetment needs to be reinforced. Background Art

[0002] my country has many mountains and rivers, and some of the river channels were built in the 1980s and 1990s. River revetments are generally made of locally sourced stone filling, block backfill, and stone masonry. Revetment support and reinforcement is a systematic project, especially for inland river revetments. It is necessary to consider not only the stability after reinforcement, but also the safety of the construction process, as well as social impact issues such as nature protection and ecological environment, water conservancy and flood control, and transportation and life.

[0003] When a new building is built close to a river channel, a deep foundation pit is excavated close to the river channel. When the edge of the foundation pit is less than 2m away from the river channel, the following problems may arise during the construction process: (1) If no support reinforcement measures are taken, the river bank and soil cannot provide sufficient support for the foundation pit excavation, and the bank and soil will be pushed into the river channel as a whole; (2) When support reinforcement measures are taken, the concrete support at the top of the foundation pit is high, while the bank is low, so it cannot provide support at the top; (3) When a support reinforcement structure is set up in the river channel, the local pressure of the support is concentrated, which causes great damage to the bank on both sides of the river channel and destroys the original ecological environment; (4) The entire river channel reinforcement system has a slow construction speed, low efficiency, long construction period, and troublesome demolition at a later stage, which seriously affects the construction progress. Summary of the invention

[0004] The purpose of the present invention is to arrange steel supports between the revetments on both sides of the river channel, so as to transfer the supporting force of the revetment and soil on the other side of the deep foundation pit through the steel supports, so as to prevent the revetment and soil from being pushed into the river channel as a whole. At the same time, column piers and retaining walls are arranged on the top of the revetment on the side of the deep foundation pit, steel sheet piles are driven on the back of the revetment and backfilled to increase the soil, and the steel sheet piles and retaining walls are used to provide supporting force for the concrete support on the top of the deep foundation pit. The assembled steel support structure is used for rapid support, which reduces the damage to the revetment, improves the construction efficiency and saves the construction period. It is urgent to invent a simple and effective steel sheet pile support steel support reinforcement revetment and construction method for the deep foundation pit adjacent to the river channel.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical scheme: a construction method for reinforcing the revetment by steel sheet pile support for deep foundation pit close to the river, comprising the following specific steps:

[0006] Step 1: Construction preparation:

[0007] Step 2: Casting of new column foundation: along the measured line position, clean the silt on both sides of the river channel, tie the steel cage, support the formwork, and cast the new column foundation on both sides of the river channel. During the concrete pouring process, set embedded parts at the position where the steel column needs to be installed. The concrete pouring height of the new column foundation is flush with the height of the original sill foundation;

[0008] Step 3: Construction of column piers: Drill holes at the top of the sill according to the measured position, implant connecting bars into the holes at the top of the sill, tie the steel cage of the column pier, weld the steel cage of the column pier to the connecting bars, use an integral box-shaped formwork to cover the steel cage of the column pier, and cast the column pier. The longitudinal spacing between adjacent column piers is 3-6m;

[0009] Step 4: Installation of steel columns: Install the steel columns on the embedded parts of the new column foundation, and connect the column bottom plate to the embedded parts through anchor bolts;

[0010] Step 5: Installation of steel purlins: Hang the pre-made steel purlins in sections to the top plate of the steel columns, fill the purlin pads with uniform spacing between the steel purlins and the sills, align the conversion plate with jacks and the bolt holes on the steel purlins, and use bolts to fix the conversion plate and the steel purlins;

[0011] Step 6: Installation of steel support: Lift the steel support with bearing plates welded on both ends in advance, place the two ends of the steel support on the large-size angle steel on the top of the steel column, adjust the jack and make the top of the jack rest on the bearing plate, apply a top thrust to the steel support through the jack, so that the steel support can hold the embankment on both sides of the river tightly;

[0012] Step 7: Driving steel sheet piles: The steel sheet piles are driven into the soil layer behind the original embankment until they reach the bedrock. The steel sheet piles are arranged along the longitudinal length of the river channel, and multiple back ribs are arranged vertically on the steel sheet piles. The back ribs are arranged along the longitudinal length of the river channel.

[0013] Step 8. Install the retaining wall: Support the retaining wall on the back of the column pier, and support the bottom of the retaining wall on the original back soil layer of the embankment. The retaining wall is arranged along the longitudinal length of the river channel. Use cement nails to fix the strip steel plate on the retaining wall. There are multiple strip steel plates in the vertical direction. Set steel pipe supports between the back ribs of the steel sheet piles and the strip steel plates, and use the steel pipe supports to hold the steel sheet piles and the retaining wall tightly.

[0014] Step 9: Backfilling: backfilling in layers on top of the original back soil layer of the embankment;

[0015] Step 10: Construction of the main foundation pit.

[0016] Preferably, the specific method of step one is as follows: measure and lay out according to the designed position of the main foundation pit, mark out the position line of steel sheet pile driving and the edge line of new column foundation casting, and mark out the construction position line of steel columns and column piers and the installation line of purlin pads; process and manufacture steel pipe supports, steel columns, large-size angle steels, steel purlins, steel supports, purlin pads, and strip steel plates in advance in the steel structure factory; weld column bottom plates at the bottom of steel columns, weld column top plates at the top of steel columns, weld large-size angle steels to the top of steel columns, cut and manufacture steel supports according to the width of the river channel, and weld load-bearing plates at both ends of the steel supports; fix the jack base on the conversion plate in advance, and drill bolt holes at the positions where the conversion plates are to be installed on the steel purlins.

[0017] Preferably, in step 4, the spacing between adjacent steel columns is 3m.

[0018] Preferably, in step six, a pad is arranged between the jack head and the load-bearing plate, and the steel supports are arranged in sequence along the longitudinal direction of the river channel, and the spacing between adjacent steel supports is set to 3m.

[0019] Preferably, in step nine, the backfill height of the top of the backfill soil is higher than the top height of the steel sheet piles.

[0020] Preferably, the specific method of step ten is as follows: construct a guide wall on the top of the backfill soil, construct the interlocking piles through the guide wall, cast the crown beam on the top of the interlocking piles, set concrete supports between the crown beams, and use an excavator to excavate layer by layer along the main foundation pit excavation line to the designed depth.

[0021] Preferably, in step five, adjacent purlin pad strips are spaced 0.5 m apart longitudinally.

[0022] The invention discloses a steel sheet pile supporting steel bracing reinforcement revetment for a deep foundation pit close to a river channel, which is obtained by a construction method of a steel sheet pile supporting steel bracing reinforcement revetment for a deep foundation pit close to a river channel.

[0023] The present invention has the following characteristics and beneficial effects:

[0024] (1) The present invention arranges steel supports between the revetments on both sides of the river channel, so that the supporting force of the revetments and soil on one side close to the deep foundation pit is transmitted to the revetments and soil on the other side through the steel supports, thereby preventing the revetments and soil on the side close to the deep foundation pit from being pushed to the river channel as a whole, and effectively solving the problem of unbalanced load.

[0025] (2) The present invention constructs column piers and retaining walls on the top of the revetment adjacent to the deep foundation pit, drives steel sheet piles on the back of the revetment and backfills to raise the soil, and provides support for the concrete support on the top of the deep foundation pit through the steel sheet piles and the raised retaining wall, thereby solving the problem that the original revetment is relatively short and the concrete support on the top of the foundation pit is relatively high and cannot provide top support.

[0026] (3) The present invention fills the purlin pads with uniform spacing between the steel purlin and the embankment, reduces stress concentration through the purlin pads, and effectively avoids damage to the embankments on both sides of the river channel.

[0027] (4) The steel purlins, steel supports and steel columns of the present invention are all manufactured and processed in the factory in advance and quickly assembled on site. The tightness of the steel supports is adjusted by jacks, which speeds up the construction efficiency, allows for quick dismantling at a later stage and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the overall structural diagram of the steel sheet pile support steel reinforced revetment for the deep foundation pit close to the river channel of the present invention;

[0029] Figure 2 It is a longitudinal side view of the steel sheet pile supporting steel reinforced revetment in the deep foundation pit close to the river channel of the present invention;

[0030] Figure 3 It is an enlarged detailed view of the local structure of the steel bracing reinforcement revetment of the present invention;

[0031] Figure 4 It is a detailed plan view of the installation of the steel column of the present invention;

[0032] Figure 5 It is an enlarged detailed view of the steel column installation structure of the present invention;

[0033] Figure 6 It is an enlarged detailed view of the local structure of the steel sheet pile supporting steel bracing reinforcement revetment of the present invention;

[0034] Figure 7 It is a detailed support diagram of the steel sheet pile and column pier retaining wall structure of the present invention;

[0035] Figure 8 This is a connection diagram of the strip steel plate and the retaining wall of the present invention.

[0036] Among them: 1-concrete support; 2-cap beam; 3-main foundation pit; 4-interlocking piles; 5-steel sheet piles; 6-original back soil layer of the sill; 7-backfill soil; 8-back ribs; 9-steel pipe support; 10-original sill foundation; 11-new column foundation; 12-embedded parts; 13-river channel; 14-steel columns; 15-large-size angle steel; 16-steel purlin; 17-conversion plate; 18-jack; 19-load-bearing plate; 20-steel support; 21-purlin pad strips; 22-sill; 23-connecting reinforcement; 24-column pier; 25-retaining wall; 26-strip steel plate; 27-anchor bolts; 28-column bottom plate; 29-column top plate; 30-bolts; 31-cement nails. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0038] The manufacturing standards of steel purlins, steel supports, and steel columns, the working principle of jacks, the reinforcement technology for sills, the pouring technology for column foundations, the reinforcement binding and welding technology for column piers, the retaining wall prefabrication technology, the steel sheet pile driving technology, the connection methods of various steel components, the layered backfilling method of backfill soil, the construction methods of interlocking piles, concrete supports, crown beams, and foundation pit excavation, the welding of various steel plates, the connection methods of bolt models, the concrete pouring technology, etc., will not be repeated in the present invention, and the focus will be on elaborating on the implementation methods of the structure involved in the present invention.

[0039] like Figure 1 , Figure 4 , Figure 5 As shown, the overall structure of the steel sheet pile support steel reinforced revetment in the deep foundation pit close to the river channel includes concrete support 1, main foundation pit 3, original revetment back soil layer 6, original revetment foundation 10, new column foundation 11, embedded parts 12, river channel 13, steel column 14, revetment 22, anchor bolts 27, column bottom plate 28, column top plate 29, and revetment 22 is respectively arranged on both sides of the river channel 13. The distance between the main foundation pit 3 and the revetment 22 on the closer side is less than 2m, and the revetment 22 and the original revetment back soil layer 6 are not enough to provide sufficient retaining force for the concrete support 1 to support. A new column foundation 11 is cast on the side of the original barge foundation 10, and the height of the new column foundation 11 is flush with that of the original barge foundation 10. The new column foundation 11 is arranged along both sides of the river channel 13. Embedded parts 12 are arranged in the new column foundation 11. A column bottom plate 28 is welded to the top of the steel column 14, and a column top plate 29 is welded to the top of the steel column 14. Bolt holes are reserved on the column bottom plate 28. The bottom of the steel column 14 is fixed to the embedded part 12 by an anchor bolt 27. The steel columns 14 are evenly arranged along the longitudinal direction of the river channel, and the spacing between adjacent steel columns 14 is 3m.

[0040] like Figure 1 , Figure 2 , Figure 3 As shown, Figure 3It is an enlarged detailed drawing of the local structure of the steel bracing reinforcement revetment. The structure includes steel columns 14, large-sized angle steels 15, steel purlins 16, conversion plates 17, jacks 18, load-bearing plates 19, steel supports 20, purlin pads 21, revetments 22, column top plates 29, and bolts 30. Large-sized angle steels 15 are welded to the tops of steel columns 14. Steel purlins 16 are placed on column top plates 29 along the longitudinal direction of the river channel 13. Steel purlins 16 are fixedly connected to conversion plates 17 by bolts 30. Jacks 18 are fixed to steel purlins 16 through conversion plates 17. The base of jacks 18 is welded and fixed to conversion plates 17 in advance. Load-bearing plates 19 are welded on both sides of the steel support 20, and the jack 18 is supported on the load-bearing plate 19. Pads are arranged between the load-bearing plate 19 and the top of the jack 18. The load-bearing plate 19 is placed on the top of the large-size angle steel 15. The jack 18 can adjust the tightness of the steel support 20. The steel supports 20 are arranged in sequence along the longitudinal direction of the river channel, and one steel support 20 is arranged every 3m; a number of purlin pad strips 21 are filled between the steel purlin 16 and the sill 22, and the interval between adjacent purlin pad strips 21 is 0.5m.

[0041] like Figure 1 , Figure 6 , Figure 7 as well as Figure 8 As shown, Figure 6 The enlarged detailed diagram of the local structure of the sheet pile support steel bracing reinforcement revetment includes concrete support 1, crown beam 2, main foundation pit 3, interlocking pile 4, steel sheet pile 5, original revetment back soil layer 6, backfill soil 7, back rib 8, steel pipe support 9, revetment 22, connecting rib 23, column pier 24, retaining wall 25, strip steel plate 26, cement nail 31. The connecting rib 23 is drilled and implanted in the top of the revetment 22. The steel cage of the column pier 24 is welded with the connecting rib 23. The column pier 24 is evenly arranged along the longitudinal direction of the river channel, and the longitudinal spacing between adjacent column piers 24 is 3-6m. The retaining wall 25 is installed on the back of the column pier 24. In this embodiment, the back of the column pier 24 is the side of the column pier 24 away from the river channel 13. The retaining wall 25 is a prefabricated concrete structure, which is arranged along the longitudinal direction of the river channel; the strip steel plate 26 is fixed on the retaining wall 25 by cement nails 31. Steel sheet piles 5 are driven into the soil layer 6 behind the original revetment. The steel sheet piles 5 need to be driven into the bedrock to a certain depth. Multiple back ribs 8 are set on the steel sheet piles 5. The back ribs 8 are set along the longitudinal length of the river channel 13. Steel pipe supports 9 are set between the back ribs 8 and the strip steel plates 26. Backfill soil 7 is set on the back of the retaining wall 25. The backfill soil 7 is backfilled in layers until the steel sheet piles 5 are completely buried. After the backfill soil 7 is constructed, the interlocking piles 4 are constructed. A crown beam 2 is set on the top of the interlocking piles 4. Concrete supports 1 are set between the crown beams 2. The main foundation pit 3 is excavated in layers to the designed depth on the side of the interlocking piles 4 away from the river channel 13. In this embodiment, the back of the retaining wall 25 is the side of the retaining wall 25 away from the river channel 13.

[0042] The construction method of steel sheet pile support steel bracing reinforcement revetment in deep foundation pit close to the river channel includes the following steps:

[0043] (1) Construction preparation:

[0044] According to the designed position of the main foundation pit 3, the measurement and layout are carried out, the position line of the steel sheet pile 5 and the casting edge line of the new column foundation 11 are laid out, and the construction position lines of the steel column 14 and the column pier 24 and the installation line of the purlin pad strip 21 are laid out. The steel pipe support 9, steel column 14, large-size angle steel 15, steel purlin 16, steel support 20, purlin pad strip 21, and strip steel plate 26 are processed and manufactured in advance in the steel structure factory. The column bottom plate 28 is welded at the bottom of the steel column 14, and the column top plate 29 is welded at the top of the steel column 14. The large-size angle steel 15 is welded to the top of the steel column 14. The steel support 20 is cut and manufactured according to the width of the river channel 13, and the bearing plates 19 are welded at both ends of the steel support 20; the base of the jack 18 is fixed on the conversion plate 17 in advance, and bolt holes are drilled at the position where the conversion plate 17 is to be installed on the steel purlin 16.

[0045] (2) Pouring of new column foundation:

[0046] Along the measured position, the silt on both sides of the river channel 13 is cleared, the steel cage is tied, the formwork is set up, and the new column foundation 11 is poured on both sides of the river channel 13. During the concrete pouring process, embedded parts 12 are set at the position where the steel column 14 needs to be installed. The concrete pouring height of the new column foundation 11 is flush with the height of the original embankment foundation 10.

[0047] (3) Construction of column piers:

[0048] According to the measured layout position, drill holes on the top of the sill 22, implant connecting bars 23 into the holes on the top of the sill 22, tie the steel cage of the column pier 24, weld the steel cage of the column pier 24 and the connecting bars 23, use an integral box-shaped formwork to cover the steel cage of the column pier 24, and cast the column pier 24. The longitudinal spacing between adjacent column piers 24 is 3-6m, which can be adjusted according to the site conditions.

[0049] (4) Installation of steel columns:

[0050] The steel columns 14 are installed on the embedded parts 12 of the new column foundation 11. The column bottom plate 28 is connected to the embedded parts 12 through the anchor bolts 27. Check whether the steel columns 14 are in a vertical position. The distance between adjacent steel columns 14 is 3m.

[0051] (5) Installation of steel purlin:

[0052] The pre-made steel purlin 16 is hoisted in sections to the column top plate 29 on the top of the steel column 14, and the purlin pad strips 21 are filled evenly between the steel purlin 16 and the sill 22. The adjacent purlin pad strips 21 are spaced 0.5m apart longitudinally. The conversion plate 17 equipped with the jack 18 is aligned with the bolt holes on the steel purlin 16, and the conversion plate 17 and the steel purlin 16 are fixedly connected with the bolts 30.

[0053] (6) Steel support installation:

[0054] The steel support 20 with bearing plates 19 welded on both ends in advance is lifted, and both ends of the steel support 20 are placed on the large-sized angle steel 15 on the top of the steel column 14. The jack 18 is adjusted and the top of the jack 18 is placed on the bearing plate 19. A cushion block is set between the top of the jack 18 and the bearing plate 19. The jack 18 applies a top thrust to the steel support 20, so that the steel support 20 supports the embankments 22 on both sides of the river channel 13. The steel supports 20 are arranged in sequence along the longitudinal direction of the river channel 13, and the spacing between adjacent steel supports 20 is set to 3m.

[0055] (7) Driving steel sheet piles:

[0056] After the steel supports 20 hold up the embankments 22 on both sides, steel sheet piles 5 are driven along the measured and laid-out positions. The steel sheet piles 5 are driven into the original embankment back soil layer 6. The steel sheet piles 5 are driven until the bedrock. The steel sheet piles 5 are arranged along the longitudinal length of the river channel 13. A plurality of back ribs 8 are arranged vertically on the steel sheet piles 5. The back ribs 8 are arranged along the longitudinal length of the river channel 13.

[0057] (8) Install retaining wall:

[0058] The retaining wall 25 is supported on the back of the column pier 24, and the bottom of the retaining wall 25 is supported on the original back soil layer 6 of the revetment. The retaining wall 25 is arranged along the longitudinal length of the river channel 13. Concrete nails 31 are used to fix the strip steel plate 26 on the retaining wall 25. The strip steel plate 26 is arranged in multiple rows in the vertical direction. A steel pipe support 9 is arranged between the back rib 8 of the steel sheet pile 5 and the strip steel plate 26, and the steel sheet pile 5 and the retaining wall 25 are tightened by the steel pipe support 9.

[0059] (9) Backfill construction:

[0060] Backfill soil 7 is constructed in layers on the top of the original back soil layer 6 of the revetment. The backfill soil 7 must be filled tightly.

[0061] Top Back

[0062] The backfill height must cover the top of the steel sheet pile 5 , that is, the backfill height of the top of the backfill soil 7 is higher than the top height of the steel sheet pile 5 .

[0063] (10) Main foundation pit construction:

[0064] A guide wall is constructed on the top of the backfill soil 7, and the interlocking piles 4 are constructed through the guide wall. The crown beams 2 are cast on the top of the interlocking piles 4, and concrete supports 1 are set between the crown beams 2. An excavator is used to excavate layer by layer along the excavation line of the main foundation pit 3 to the designed depth, and then the main structure of the main foundation pit 3 is constructed in sequence. After the main structure construction is completed, the steel sheet pile support steel bracing reinforcement system is dismantled to restore the river bank.

[0065] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

Claims

1. A construction method for reinforcing the revetment by steel sheet pile support for deep foundation pit close to the river, characterized in that: The specific steps include: Step 1: Construction preparation: Step 2: Casting of new column foundation: along the measured and laid-out position, clean the silt on both sides of the river channel (13), tie the steel cage, set up the formwork, and cast the new column foundation (11) on both sides of the river channel (13). During the concrete pouring process, set the embedded parts (12) at the position where the steel column (14) needs to be installed. The concrete pouring height of the new column foundation (11) is flush with the height of the original sill foundation (10); Step 3, construction of column piers: according to the measured and laid-out position, a hole is drilled at the top of the sill (22), a connecting bar (23) is implanted into the hole at the top of the sill (22), a steel cage of the column pier (24) is tied, the steel cage of the column pier (24) and the connecting bar (23) are welded, an integral box-shaped template is used to cover the steel cage of the column pier (24), and the column pier (24) is cast, and the longitudinal spacing between adjacent column piers (24) is 3-6m; Step 4: Installing the steel column: Install the steel column (14) on the embedded part (12) of the new column foundation (11), and connect the column bottom plate (28) to the embedded part (12) through the anchor bolt (27); Step 5: Installation of steel purlins: The prefabricated steel purlins (16) are hoisted in sections onto the column top plate (29) at the top of the steel column (14), and the purlin pad strips (21) are filled evenly between the steel purlins (16) and the sill (22), and the conversion plate (17) equipped with the jack (18) is aligned with the bolt holes on the steel purlin (16), and the conversion plate (17) and the steel purlin (16) are fixedly connected by bolts (30); Step 6, installation of the steel support: lift the steel support (20) with bearing plates (19) welded to both ends in advance, place both ends of the steel support (20) on the large-size angle steel (15) on the top of the steel column (14), adjust the jack (18) and make the top of the jack (18) rest on the bearing plate (19), apply a top thrust to the steel support (20) through the jack (18), so that the steel support (20) can hold the sills (22) on both sides of the river channel (13); Step 7, driving the steel sheet piles: The steel sheet piles (5) are driven into the original back soil layer (6) of the revetment bank, and the steel sheet piles (5) are driven until they reach the bedrock. The steel sheet piles (5) are arranged along the longitudinal length of the river channel (13), and a plurality of back ribs (8) are arranged vertically on the steel sheet piles (5), and the back ribs (8) are arranged along the longitudinal length of the river channel (13); Step 8, installing the retaining wall: the retaining wall (25) is supported on the back of the column pier (24), the bottom of the retaining wall (25) is supported on the original back soil layer (6) of the embankment, the retaining wall (25) is arranged along the longitudinal length of the river channel (13), the strip steel plate (26) is fixed on the retaining wall (25) by cement nails (31), the strip steel plate (26) is provided with multiple strips in the vertical direction, a steel pipe support (9) is provided between the back rib (8) of the steel sheet pile (5) and the strip steel plate (26), and the steel sheet pile (5) and the retaining wall (25) are tightly supported by the steel pipe support (9); Step 9: Backfilling: constructing backfilling (7) in layers on top of the original back soil layer (6); Step 10: Construction of the main foundation pit.

2. The construction method of steel sheet pile support steel reinforced revetment in deep foundation pit close to the river channel according to claim 1 is characterized in that: The specific method of step 1 is as follows: according to the designed position of the main foundation pit (3), the measurement and layout are carried out, the position line of the steel sheet pile (5) and the casting edge line of the new column foundation (11) are laid out, and the construction position line of the steel column (14) and the column pier (24) and the installation line of the purlin pad strip (21) are laid out, and the steel pipe support (9), steel column (14), large-size angle steel (15), steel purlin (16), steel support (20), purlin pad strip (21), strip steel plate are processed and manufactured in advance in the steel structure factory. (26), a column bottom plate (28) is welded at the bottom of the steel column (14), a column top plate (29) is welded at the top of the steel column (14), a large-size angle steel (15) is welded to the top of the steel column (14), a steel support (20) is cut and manufactured according to the width of the river channel (13), and a load-bearing plate (19) is welded at both ends of the steel support (20); the base of the jack (18) is fixed on the conversion plate (17) in advance, and bolt holes are drilled at the position where the conversion plate (17) is to be installed on the steel purlin (16).

3. The construction method of steel sheet pile support steel reinforced revetment in deep foundation pit close to river channel according to claim 1 is characterized in that: In step 4, the distance between adjacent steel columns (14) is 3m.

4. The construction method of reinforcing the revetment with steel sheet pile support for deep foundation pit close to the river channel according to claim 1 is characterized in that: In step six, a cushion block is arranged between the top of the jack (18) and the load-bearing plate (19), and the steel supports (20) are arranged in sequence along the longitudinal direction of the river channel (13), and the spacing between adjacent steel supports (20) is set to 3m.

5. The construction method of reinforcing the revetment with steel sheet pile support for deep foundation pit close to the river channel according to claim 1 is characterized in that: In step nine, the top backfill height of the backfill soil (7) is higher than the top height of the steel sheet pile (5).

6. The construction method of steel sheet pile support steel reinforced revetment in deep foundation pit close to river channel according to claim 1 is characterized in that: The specific method of step ten is as follows: construct a guide wall on the top of the backfill soil (7), construct the interlocking piles (4) through the guide wall, cast the cap beams (2) on the top of the interlocking piles (4), set concrete supports (1) between the cap beams (2), and use an excavator to excavate layer by layer along the excavation line of the main foundation pit (3) to the designed depth.

7. The construction method of steel sheet pile support steel reinforced revetment in deep foundation pit close to river channel according to claim 1 is characterized in that: In step 5, the adjacent purlin pad strips (21) are spaced 0.5 m apart longitudinally.

8. A steel sheet pile supporting steel reinforced revetment for a deep foundation pit close to a river, characterized in that: The invention is obtained by the construction method of steel sheet pile support steel bracing and reinforcing the revetment in a deep foundation pit close to a river channel as described in any one of claims 1 to 7.

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