Construction method of combined reinforcement system of underground continuous wall close to subway

Abstract

The present invention relates to a construction method of a combined reinforcement system of a preset underground continuous wall adjacent to a subway, comprising the following construction steps: S1, bored cast-in-place pile construction; S2, high-pressure rotary jet pile construction; S3, underground continuous wall construction; S4, crown beam construction. The present invention solves the problem of drilling positioning in soft strata by utilizing the existing underground continuous wall as a guide platform. By arranging a leveler on the guide device, the posture of the guide device can be dynamically adjusted to avoid damage to the existing continuous wall caused by drilling, thereby improving the construction quality. The present invention has the characteristics of high structural stability of the new and old underground continuous walls, little impact on subway operations during construction, simple construction operation, etc., and has good comprehensive benefits.

Description

Technical Field

[0001] The invention relates to a construction method for a combined reinforcement system of a preset underground continuous wall close to a subway, and is mainly applicable to the reinforcement construction of a newly added underground continuous wall close to a subway. Background Art

[0002] With the acceleration of my country's urbanization process, the number and scale of construction projects are gradually increasing due to the needs of urban construction and people's lives, which has directly led to the aggravation of the land shortage. In order to alleviate this situation, in addition to increasing the height and widening the ground use space, the construction of engineering projects also takes into account the application of underground parts, such as the construction of large underground parking lots, underground shopping malls and other underground construction projects. The most critical thing about the construction of underground parts is to consider the stability of underground space. At this time, it is necessary to use underground continuous wall technology for construction. Its main application principle is to combine with the construction of underground deep foundation pits, and build corresponding continuous walls through construction processes such as groove design, concrete pouring, and steel cage reinforcement, so as to support and protect the deep foundation pits.

[0003] The underground continuous wall near the subway that has been completed (built by the subway construction unit) has no T-joint reserved, and there are bulging quality problems in the joint area with the underground continuous wall to be constructed. It tilts toward the inside of the foundation pit 3m above the pit bottom and is misaligned with the adjacent underground continuous wall. In view of the above problems, the foundation pit excavation must ensure the safety of the adjacent subway operation, and the existing underground continuous wall needs to be reinforced.

[0004] In view of this, in view of a series of problems arising in the construction of preset underground continuous walls adjacent to subways, it is urgent to invent a simple and effective construction method of a combined reinforcement system for preset underground continuous walls adjacent to subways to improve the safety of construction, especially for the construction of underground continuous walls adjacent to subways, which has the advantages of significantly saving construction costs, speeding up construction progress and improving construction safety performance. Summary of the invention

[0005] The purpose of the present invention is to improve the safety of construction, especially for the construction of underground continuous walls close to subways, which has the advantages of significantly saving construction costs, accelerating construction progress and improving construction safety performance.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solution: a construction method for a combined reinforcement system of a preset underground continuous wall adjacent to a subway, comprising the following specific steps:

[0007] S1. Bored pile construction: Bored piles are drilled using a rotary drilling rig, and the drilling location is located at the junction of the newly built underground continuous wall and the existing underground continuous wall;

[0008] After the hole is formed, the steel cage is hoisted and placed in the hole, and concrete is poured. After the concrete is formed, bored piles are obtained.

[0009] S2. High-pressure rotary jet grouting pile construction: High-pressure rotary jet grouting pile construction is carried out at the connection between the newly built underground continuous wall and the existing underground continuous wall;

[0010] S3. Construction of new underground continuous wall; excavation of foundation pit, and construction of cushion layer and slab support casting formwork system after excavation; during cushion layer construction, cushion blocks are set at the bottom of the foundation pit;

[0011] The construction method of the plate support casting formwork system is as follows: the bottom of the telescopic rod is set on the pad, the support plate is set on the top of the telescopic rod, steel bars are implanted on the existing underground continuous wall, the steel bars are welded to one end of the I-beam, the I-beams are arranged in a vertical direction, the lowest I-beam is fixed to the support plate by bolts, the adjacent I-beams are fixed by support rods, U-shaped fixings are set on the support rods, connecting rods are set between the horizontally adjacent support rods, and the plate support bottom formwork is set on the connecting rods; purlins are set on the existing underground continuous wall, and the purlins are set on both sides of the plate support bottom formwork; tie holes are set on the purlins, and the purlins serve as the side formwork of the plate support, and plugging plates are set between the purlins on both sides of the plate support bottom formwork, and reserved embedded reinforcement is set on the outer side of the plugging plates;

[0012] The slab support bottom formwork, purlin, plugging plate and the existing underground continuous wall together form a pouring area, and concrete is poured in the pouring area. After the concrete is formed, the slab support is obtained; the slab support is used as a reinforcement structure, and then the plain concrete section is poured; in the plain concrete section, the embedded steel bars are reserved and buried in the plain concrete section;

[0013] S4. Carry out the crown beam construction on the top of the newly built underground continuous wall and bored cast-in-place piles; firstly, carry out the construction of the special-shaped crown beam tension formwork system. The construction method of the special-shaped crown beam tension formwork system is as follows:

[0014] The side formwork is formed by assembling a straight formwork or a straight formwork and an irregular formwork. The side forms on both sides are connected by tensioning bars. Back ribs are arranged on the outside of the side formwork. The back ribs are close to the side formwork. The tie bars and the back ribs are fastened by the tie pieces at both ends of the tie bars. The side forms on both sides are supported by diagonal braces.

[0015] After the construction of the special-shaped crown beam tension formwork system is completed, it will be inspected. After the inspection is completed, concrete is poured between the side forms, and the crown beam is formed after the concrete is formed.

[0016] Preferably, in step S1, drilling positioning is performed by a bored pile guide device, and the construction method of the bored pile guide device is as follows:

[0017] A sleeve is set at the upper end of the existing underground continuous wall, one end of the L frame is connected to the special-shaped casing, and the other end of the L frame is connected to the steel plate. The steel plate is connected to the sleeve at the upper end of the existing underground continuous wall by bolts, so that the special-shaped casing is placed above the hole to be excavated; a leveler is set on the steel plate;

[0018] When drilling, the drill bit of the rotary drilling rig extends into the special-shaped casing, and the drilling direction of the drill bit of the rotary drilling rig is guided by the special-shaped casing. During the drilling process, the level of the steel plate is detected by the leveler, and the level of the steel plate is adjusted, and then the posture of the special-shaped casing is adjusted to avoid deviation in the drilling direction.

[0019] Preferably, in step S2, the high-pressure jet grouting pile construction includes the following steps: hole drawing, drilling rig positioning, slurry preparation, grouting and high-pressure jet grouting consolidation body quality inspection.

[0020] Preferably, in step S3, a groove is provided on the U-shaped fixing member, and both ends of the connecting rod are respectively inserted into the groove.

[0021] Preferably, in step S4, a hoop casing is provided at the upper end of the bored pile, a hoop platform is welded to the side of the hoop casing, and a wooden strip is provided on the hoop platform; the wooden strip is fixed to the hoop platform by bolts;

[0022] The diagonal brace on one side is set on the I-beam, and the upper end supports the side form; the diagonal brace on the other side is set on the clamping platform, the lower end of the diagonal brace supports the wooden strip, and the upper end of the diagonal brace supports the side form.

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

[0024] 1. A bored pile guide device was developed. By using the existing underground continuous wall as a guide platform, the problem of drilling positioning in soft strata was solved. By setting a leveler on the guide device, the posture of the guide device can be dynamically adjusted to avoid damage to the existing continuous wall caused by drilling, thereby improving the construction quality.

[0025] 2. A slab-supported casting formwork system was developed, which fully utilized the installed purlin structure. By pulling and tightening the support rods and telescopic rods, the difficulty of erecting the slab-supported formwork was solved, and the strength of the new and old underground continuous walls was improved.

[0026] 3. A special-shaped crown-beam tension formwork system was developed, which used the surrounding purlin structure and bored cast-in-place pile structure system as the diagonal bracing support platform to speed up the construction efficiency.

[0027] 4. The present invention has the characteristics of high stability of the new and old underground continuous wall structures, little impact on subway operations during construction, simple construction operations, etc., and has good comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of a preset underground continuous wall assembly adjacent to a subway according to the present invention;

[0029] Figure 2 It is a reinforcement plan of the underground continuous wall preset next to the subway of the present invention;

[0030] Figure 3 This is a schematic diagram of the bored pile guide device of the present invention.

[0031] Figure 4 It is a schematic diagram of a special-shaped casing of the present invention;

[0032] Figure 5 It is a three-dimensional diagram of the plate support casting formwork system of the present invention;

[0033] Figure 6 This is a schematic diagram of the plate support bottom mold support of the present invention;

[0034] Figure 7 It is a cross-sectional detail diagram of the plate support casting formwork system of the present invention;

[0035] Figure 8 It is a three-dimensional diagram of the special-shaped crown beam tension template system of the present invention;

[0036] Fig. 9 It is a schematic diagram of the special-shaped crown beam tensioning template system of the present invention.

[0037] Among them: 1-subway tunnel, 2-existing underground continuous wall, 3-crown beam, 4-purlin, 5-new underground continuous wall, 6-foundation pit, 7-sleeve, 8-bolt, 9-L frame, 10-special-shaped casing, 11-leveler, 12-steel plate, 13-hole to be excavated, 14-ear plate, 15-positioning hole, 16-tie hole, 17-plug plate, 18-reserved embedded steel bar, 19-U-shaped fixing parts, 20-groove, 21-connecting rod, 22 - Plate support bottom formwork, 23-I-beam, 24-support rod, 25-telescopic rod, 26-pad, 27-rebar, 28-support plate, 29-hoop platform, 30-wooden strips, 32-diagonal support rods, 33-tie bars, 34-side formwork, 35-back rib, 36-straight formwork, 37-irregular formwork, 38-hoop casing, 39-anchor, 40-bored cast-in-place piles, 41-reinforcement structure, 42-plain concrete section, 43-high-pressure rotary jet piles. DETAILED DESCRIPTION

[0038] Embodiment 1

[0039] The invention relates to a combined reinforcement system for underground continuous walls close to a subway, including a bored cast-in-place pile guide device, a plate support casting template system, and a special-shaped crown beam tension template system. The construction method of the combined reinforcement system for underground continuous walls close to a subway includes the following steps: bored cast-in-place pile construction, high-pressure rotary jet pile construction, underground continuous wall construction, and crown beam construction.

[0040] like Figure 1 , Figure 2 As shown, an existing underground continuous wall 2 is arranged around the subway tunnel 1, a foundation pit 6 is excavated outside the existing underground continuous wall 2, surrounding purlins 4 are arranged around the foundation pit 6, a newly built underground continuous wall 5 is arranged close to the inner wall of the foundation pit, and a crown beam 3 is cast on the top of the newly built underground continuous wall 5 and the existing underground continuous wall 2. The newly built underground continuous wall 5 includes a reinforcement structure 41 and a plain concrete section 42, and the soil is reinforced by bored cast-in-place piles 40 and high-pressure rotary jet piles 43. The bored cast-in-place piles 40 and the high-pressure rotary jet piles 43 are arranged at the junction of the newly built underground continuous wall 5 and the existing underground continuous wall 2.

[0041] like Figure 3 , Figure 4 As shown, the bored pile guide device includes a special-shaped casing 10, a sleeve 7, an L frame 9, and a steel plate 12. The sleeve 7 is arranged at the upper end of the existing underground continuous wall 2, and the sleeve 7 is pre-buried in the existing underground continuous wall 2. The special-shaped casing 10 is arranged above the hole 13 to be excavated, and the ear plate 14 is arranged on the special-shaped casing 10. The ear plate 14 is arranged on the outside of the special-shaped casing 10, and the positioning hole 15 is arranged on the ear plate 14. The special-shaped casing 10 is connected to one end of the L frame 9, and the steel plate 12 is arranged at the other end of the L frame 9. The leveler 11 is arranged on the steel plate 12, and the steel plate 12 is connected to the sleeve 7 at the upper end of the existing underground continuous wall 2 through bolts 8, so that the steel plate 12 is fixed on the existing underground continuous wall 2.

[0042] like Figure 5 , Figure 6 , Figure 7As shown, the plate support casting formwork system is used for casting plate supports, and the plate support casting formwork system includes a telescopic rod 25, a support plate 28, a cushion block 2, and an I-beam 23. The bottom of the telescopic rod 25 is arranged on the cushion block 2, and the cushion block 2 is arranged at the bottom of the foundation pit 6. The support plate 28 is arranged on the top of the telescopic rod 25. Rebars 27 are implanted on the existing underground continuous wall 2, and the rebars 27 are welded to one end of the I-beam 23. The I-beams 23 are arranged in a vertical direction. The I-beam 23 located at the lower end is fixed to the support plate 28 at the top of the telescopic rod 25 by bolts 8. Adjacent I-beams 23 are fixedly connected by support rods 24. U-shaped fixings 19 are arranged on the support rods 24, and grooves 20 are arranged on the U-shaped fixings 19. Horizontally adjacent support rods 24 are connected by connecting rods 21, and the two ends of the connecting rods 21 are respectively inserted into the grooves 20. A plate support bottom mold 22 is arranged on the connecting rods 21, and the plate support bottom mold 22 is laid on the connecting rods 21. The existing underground continuous wall 2 is provided with a purlin 4, which is located on both sides of the plate support bottom formwork 22. Anchor holes 16 are provided on the purlin 4. The purlins 4 on both sides of the plate support bottom formwork 22 are tied and fixed by tie screws, and both ends of the tie screws are respectively connected to the tie holes on the purlin 4. The purlin 4 is used as the plate support side formwork, and a plug plate 17 is provided between the ends of the purlins 4 on both sides of the plate support bottom formwork 22. Pre-reserved embedded steel bars 18 are provided on the outside of the plug plate 17. The plate support bottom formwork 22, the purlin 4, the plug plate 17 and the existing underground continuous wall 2 together enclose a casting area, and concrete is cast in the casting area to form a plate support.

[0043] like Figure 8 , Fig. 9 As shown, a crown beam 3 is set on the top of the newly built underground continuous wall 5 and bored pile 40, and the crown beam 3 is cast through a special-shaped crown beam tensioning formwork system. The special-shaped crown beam tensioning formwork system includes a side form 34 and a back rib 35. The side form 34 is divided into a straight form 36 and an irregular form 37. The side form 34 is assembled from the straight form 36, or assembled from the straight form 36 and the irregular form 37. The side forms 34 on both sides are pulled by the tension bars 33. The two ends of the tension bars 33 are respectively provided with tension pieces 39. The back rib 35 is close to the side form 34, and the tension pieces 39 fasten the tension bars 33 and the back rib 35. The side forms 34 on both sides are supported by diagonal braces 32. The diagonal braces 32 on one side are arranged on the I-beam 23, and the upper end of the diagonal braces 32 supports the side form 34. The diagonal braces 32 on the other side are arranged on the hoop platform 29. The hoop platform 29 is provided with a wooden strip 30, and the wooden strip 30 is fixed to the hoop platform 29 by bolts 8. The lower end of the diagonal braces 32 supports the wooden strip 30, and the upper end of the diagonal braces 32 supports the side form 34. The hoop platform 29 is welded and fixed to the hoop casing 38, and the hoop casing 29 is arranged on the upper end of the bored pile 40.

[0044] Embodiment 2

[0045] The construction method of the combined reinforcement system of the underground continuous wall close to the subway includes the following steps:

[0046] (1) Bored pile construction: The bored pile is drilled by a rotary drilling rig, and the bored pile is positioned by a bored pile guide device. The drilling position is located at the connection between the newly built underground continuous wall 5 and the existing underground continuous wall 2. The construction method of the bored pile guide device is as follows:

[0047] A sleeve 7 is arranged at the upper end of the existing underground continuous wall 2, one end of the L frame 9 is connected to the special-shaped casing 10, and the other end of the L frame 9 is connected to the steel plate 12, and the steel plate 12 is connected to the sleeve 7 at the upper end of the existing underground continuous wall 2 through bolts 8, so that the special-shaped casing 10 is placed above the hole 13 to be excavated; a leveler 11 is arranged on the steel plate 12;

[0048] When drilling, the drill bit of the rotary drilling rig extends into the special-shaped casing 10, and the drilling direction of the drill bit of the rotary drilling rig is guided by the special-shaped casing 10. During the drilling process, the level of the steel plate 12 is detected by the leveler 11, and the level of the steel plate 12 is adjusted, thereby adjusting the posture of the special-shaped casing 10 to avoid deviation in the drilling direction;

[0049] After the hole is formed, the steel cage is hoisted and placed in the hole, and concrete is poured. After the concrete is formed, bored piles are obtained.

[0050] (2) High-pressure rotary jet grouting pile construction: High-pressure rotary jet grouting pile construction is carried out at the connection between the newly built underground continuous wall 5 and the existing underground continuous wall 2. The rotary jet grouting pile construction is completed through the above construction procedures of hole drawing, drilling rig positioning, slurry preparation, grouting, and high-pressure jet consolidation body quality inspection.

[0051] (3) Construction of underground continuous wall; excavating foundation pit 6, and after the excavation of earthwork is completed, performing cushion layer construction and plate support casting formwork system construction; during cushion layer construction, setting cushion blocks 2 at the bottom of foundation pit 6;

[0052] The construction method of the plate support casting formwork system is as follows: the bottom of the telescopic rod 25 is set on the cushion block 2, the support plate 28 is set on the top of the telescopic rod 25, the steel bar 27 is implanted on the existing underground continuous wall 2, the steel bar 27 is welded to one end of the I-beam 23, the I-beam 23 is arranged in a vertical direction, the lowest I-beam 23 is fixed to the support plate 28 by bolts 8, and the adjacent I-beams 23 are fixed by support rods 24, and U-shaped fixing parts 19 are set on the support rods 24. A groove 20 is provided on the shaped fixing member 19, a connecting rod 21 is provided between the horizontally adjacent supporting rods 24, and the two ends of the connecting rod 21 are respectively inserted into the groove 20; a board support bottom mold 22 is provided on the connecting rod 21, and a purlin 4 is provided on the active underground continuous wall 2, and the purlin 4 is provided on both sides of the board support bottom mold 22; a tie hole 16 is provided on the purlin 4, and the purlin 4 serves as a board support side mold, and a plug plate 17 is provided between the purlins 4 on both sides of the board support bottom mold 22, and a reserved embedded reinforcement 18 is provided on the outer side of the plug plate 17;

[0053] The plate support bottom formwork 22, the surrounding purlin 4, the plugging plate 17 and the existing underground continuous wall 2 together form a casting area, and concrete is poured in the casting area. After the concrete is formed, the plate support is obtained and the plate support is used as a reinforcement structure 41; then the plain concrete section 42 is poured; when pouring the plain concrete section 42, the reserved embedded steel bars 18 are buried in the plain concrete section 42.

[0054] (4) The crown beam is constructed on the top of the newly built underground continuous wall 5 and the bored cast-in-place pile 40; first, the special-shaped crown beam tension formwork system is constructed. The construction method of the special-shaped crown beam tension formwork system is as follows:

[0055] The side formwork 34 is formed by assembling a straight formwork 36 or a straight formwork 36 and an irregular formwork 37. The side forms 34 on both sides are connected by tensioning with a pair of tie bars 33. A back rib 35 is arranged on the outer side of the side formwork 34. The back rib 35 is close to the side formwork 34. The tie pieces 39 at both ends of the tie bars 33 fasten the tie bars 33 and the back rib 35. A clamping sleeve 29 is arranged on the upper end of the bored pile 40. A clamping platform 29 is welded to the side of the clamping sleeve 29. A wooden strip 30 is arranged on the clamping platform 29. The wooden strip 30 is fixed to the clamping platform 29 by bolts 8. The side forms 34 on both sides are supported by diagonal braces 32 respectively. The diagonal braces 32 on one side are arranged on the I-beam 23, and the upper end of the diagonal braces 32 supports the side formwork 34. The diagonal braces 32 on the other side are arranged on the clamping platform 29. The lower end of the diagonal braces 32 supports the wooden strip 30, and the upper end of the diagonal braces 32 supports the side formwork 34.

[0056] After the construction of the special-shaped crown beam tension formwork system is completed, it is inspected. After the inspection is completed, concrete is poured between the side forms 34, and the crown beam is formed after the concrete is formed.

Claims

1. A construction method for a combined reinforcement system of underground continuous walls close to a subway, characterized in that: The specific steps include: S1, construction of bored piles (40); the bored piles (40) are drilled using a rotary drilling rig, and the drilling position is located at the connection between the newly built underground continuous wall (5) and the existing underground continuous wall (2); After the hole is formed, the steel cage is hoisted and placed in the hole, and concrete is poured. The steel cage is hoisted into the hole, and concrete is poured. After the concrete is formed, bored piles are obtained. S2, high-pressure rotary grouting pile (43) construction: high-pressure rotary grouting pile (43) construction is performed at the connection between the newly built underground continuous wall (5) and the existing underground continuous wall (2); S3, construction of a new underground continuous wall (5); excavation of a foundation pit (6), and after the excavation of the earthwork is completed, construction of a cushion layer and construction of a slab support casting formwork system are carried out; during the cushion layer construction, a cushion block (26) is set at the bottom of the foundation pit (6); The construction method of the plate support casting formwork system is as follows: the bottom of the telescopic rod (25) is set on the cushion block (26), the support plate (28) is set on the top of the telescopic rod (25), the steel bar (27) is implanted on the existing underground continuous wall (2), the steel bar (27) is welded to one end of the I-beam (23), the I-beam (23) is arranged in a vertical direction, the lowest I-beam (23) is fixed to the support plate (28) by bolts (8), and adjacent I-beams (23) are connected by support rods (24). ) are fixed, connecting rods (21) are arranged between horizontally adjacent supporting rods (24), and a board support bottom formwork (22) is arranged on the connecting rods (21); a purlin (4) is arranged on the existing underground continuous wall (2), and the purlin (4) is arranged on both sides of the board support bottom formwork (22); tie holes (16) are arranged on the purlin (4), and the purlin (4) serves as a board support side formwork, and a plugging plate (17) is arranged between the purlins (4) on both sides of the board support bottom formwork (22), and a reserved embedded reinforcement (18) is arranged on the outer side of the plugging plate (17); The plate support bottom formwork (22), the surrounding purlin (4), the plugging plate (17) and the existing underground continuous wall (2) together form a casting area, concrete is cast in the casting area, and after the concrete is formed, a plate support is obtained, and the plate support is used as a reinforcement structure (41); then, a plain concrete section (42) is cast; when casting the plain concrete section (42), a reserved embedded steel bar (18) is embedded in the plain concrete section (42); S4. Construction of the crown beam is carried out on the top of the newly built underground continuous wall (5) and the bored cast-in-place pile (40); firstly, construction of the special-shaped crown beam tension formwork system is carried out. The construction method of the special-shaped crown beam tension formwork system is as follows: A side mold (34) is formed by assembling a straight mold (36) or a straight mold (36) and an irregular mold (37); the side molds (34) on both sides are connected by tensioning with a pair of tie bars (33); a back rib (35) is arranged on the outer side of the side mold (34); the back rib (35) is closely attached to the side mold (34); and tie pieces (39) at both ends of the tie bars (33) fasten the tie bars (33) and the back rib (35); the side molds (34) on both sides are supported by diagonal braces (32); After the construction of the special-shaped crown beam tension formwork system is completed, it is inspected. After the inspection is completed, concrete is poured between the side forms (34) to form a crown beam (3) after the concrete is formed.

2. The construction method of the combined reinforcement system of underground continuous wall close to the subway according to claim 1 is characterized in that: In step S1, drilling positioning is performed by using a bored pile guide device, and the construction method of the bored pile guide device is as follows: A sleeve (7) is arranged at the upper end of the existing underground continuous wall (2), one end of the L frame (9) is connected to the special-shaped casing (10), the other end of the L frame (9) is connected to the steel plate (12), the steel plate (12) is connected to the sleeve (7) at the upper end of the existing underground continuous wall (2) by bolts (8), so that the special-shaped casing (10) is placed above the hole to be excavated (13); a leveler (11) is arranged on the steel plate (12); When drilling, the drill bit of the rotary drilling rig extends into the special-shaped casing (10), and the drilling direction of the drill bit of the rotary drilling rig is guided by the special-shaped casing (10). During the drilling process, the level of the steel plate (12) is detected by the leveler (11), and the level of the steel plate (12) is adjusted, thereby adjusting the posture of the special-shaped casing (10) to avoid deviation in the drilling direction.

3. The construction method of the combined reinforcement system of underground continuous wall close to the subway according to claim 1 is characterized in that: In step S2, the high-pressure jet grouting pile construction includes the following steps: hole drawing, drilling rig positioning, slurry preparation, grouting and high-pressure jet grouting consolidation body quality inspection.

4. The construction method of the combined reinforcement system of underground continuous wall close to the subway according to claim 1 is characterized in that: In step S3, a groove (20) is provided on the U-shaped fixing member (19), and both ends of the connecting rod (21) are respectively inserted into the groove (20).

5. The construction method of the combined reinforcement system of underground continuous wall close to the subway according to claim 1 is characterized in that: In step S4, a hoop casing (38) is arranged at the upper end of the bored pile (40), a hoop platform (29) is welded to the side of the hoop casing (38), and a wooden strip (30) is arranged on the hoop platform (29); the wooden strip (30) is fixed to the hoop platform (29) by bolts (8); The diagonal brace (32) on one side is arranged on the I-beam (23), and the upper end thereof abuts against the side form (34); the diagonal brace (32) on the other side is arranged on the hoop platform (29), the lower end of the diagonal brace (32) abuts against the wooden strip (30), and the upper end of the diagonal brace (32) abuts against the side form (34).

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