CN111827266B - Method for constructing underground continuous wall by using steel caisson technology - Google Patents
Method for constructing underground continuous wall by using steel caisson technology Download PDFInfo
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- CN111827266B CN111827266B CN202010707232.6A CN202010707232A CN111827266B CN 111827266 B CN111827266 B CN 111827266B CN 202010707232 A CN202010707232 A CN 202010707232A CN 111827266 B CN111827266 B CN 111827266B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
Abstract
The invention provides a method for constructing an underground continuous wall by utilizing a steel caisson technology, which comprises a single underground continuous wall and steel corner posts which are positioned at the joint part of the single underground continuous wall and are fixedly connected with the single underground continuous wall, wherein the single underground continuous wall is formed by arranging and connecting a plurality of caisson components, and guide mechanisms are arranged between the steel corner posts and the adjacent caisson components thereof and on the opposite surfaces of the adjacent caisson components in the single underground continuous wall; the construction method comprises the following steps: mechanical equipment is utilized to fetch soil, and caisson components between the steel corner columns and the adjacent steel corner columns are sunk into the soil body: removing the longitudinal steel plates of the caisson components to form a continuous wall groove; replacing and pouring concrete by slurry in the groove; and inserting a steel reinforcement cage in the wall slot according to needs. The invention cancels the process steps which are necessary to be carried out in the early stage and the later stage of the traditional underground diaphragm wall; continuous construction, complete forming and excellent quality; the construction can be carried out by adopting a small-sized construction machine; the construction period is greatly shortened, the adverse effect of construction is greatly reduced, and the economic and social benefits are remarkable.
Description
Technical Field
The invention relates to a method for constructing an underground diaphragm wall by using a steel caisson technology.
Background
The underground continuous wall is formed by adopting a trenching machine on the ground, excavating a long and narrow deep groove along the peripheral axis of a deep excavation project under the condition of slurry wall protection, hoisting a reinforcement cage in the groove after cleaning the groove, then pouring underwater concrete by using a conduit method to build a unit groove section, and thus, the construction is carried out section by section (actually A, B sections at intervals), and a continuous reinforced concrete wall is built underground. The underground continuous wall is generally suitable for building underground buildings and structures, the area of the wall finished in one year in China reaches more than one million square meters, and almost all subway stations adopt the underground continuous wall.
The main process flow of the underground continuous wall construction is as follows: the method comprises the following specific process functions of groove wall reinforcement, pouring of guide walls, slurry wall protection, grooving construction, underwater concrete pouring, wall section joint treatment and the like:
1) and (5) reinforcing the groove wall. In the soft soil area, soil bodies on the inner side and the outer side of the underground continuous wall are firstly reinforced in order to improve the grooving quality and prevent the groove walls from collapsing during grooving.
2) And (4) a guide wall. Guide walls are typically cast-in-place reinforced concrete structures. The main functions are as follows: ensuring the designed geometric size and shape of the underground continuous wall; partial slurry is stored, so that the stability of the liquid level during the tank forming construction is ensured; bear the load of the grooving machine, protect the notch earth wall from damaging, and as the benchmark of installation framework of steel reinforcement.
3) And (5) mud is used for protecting the wall. The slurry applies pressure to the wall of the groove to protect the shape of the dug deep groove from changing, and the slurry is replaced by pouring concrete.
4) And (5) grooving construction. The special machines used for grooving are: rotary cutting multi-bit drills, guide plate grab buckets, impact drills, and the like.
5) And (5) pouring concrete underwater. The method is carried out according to an underwater concrete pouring method by adopting a conduit method.
6) And (5) performing joint treatment on the wall sections. The underground continuous wall is formed by splicing a plurality of wall sections, in order to keep continuous construction between the wall sections, the joint adopts a fore shaft pipe process, and the rigid joint is also arranged according to the stress requirement of the wall structure, so that two successive wall sections are connected into a whole.
The construction process of the underground continuous wall which is not negligible in engineering and is unchanged for decades has the following problems: 1) and (5) slurry wall protection and sectional construction. This inevitably leads to problems of wall segment quality and adjacent wall segments not being able to align and leak water; 2) under some special geological conditions (such as soft soil, filling and laminating layers containing boulders, super-hard rocks and the like), the construction difficulty is very high, and the work efficiency is low; 3) the process is multiple, the cost is high, and the construction period is long. Firstly, a guide wall is manufactured, then a wall section body is poured, and water stop is manufactured at the joint position of the wall section in the later period. Because of the problem of water leakage at the joint position, almost all the outer walls of the subway station are laminated walls (namely a layer of reinforced concrete wall is cast and tamped in the constructed underground continuous wall), other underground continuous walls are either laminated walls or composite walls (namely a layer of brick wall is built in the constructed underground continuous wall), and the outer sides (soil facing sides) of the joint positions of all the underground continuous walls need to be provided with high-pressure jet grouting piles for stopping water, while the quality of the high-pressure jet grouting piles is worried, and the long-term utility is almost zero.
Disclosure of Invention
The invention improves the problems, namely the technical problems to be solved by the invention are the problems of wall section quality, unalignable adjacent wall sections, water leakage, high manufacturing cost, long construction period and the like in the existing underground continuous wall construction process.
The specific embodiment of the invention is as follows: the method for constructing the underground continuous wall by using the steel caisson technology comprises a single underground continuous wall and steel corner posts which are positioned at the joint of the single underground continuous wall and fixedly connected with the single underground continuous wall, wherein the single underground continuous wall is formed by arranging and connecting a plurality of caisson members, and the caisson members comprise steel caissons and connecting steel caissons;
guide mechanisms consisting of convex rails and guide grooves are arranged between the steel corner posts and the adjacent caisson members and on the opposite surfaces of the adjacent caisson members in the single underground continuous wall;
one end of each steel caisson is fixed with a convex rail, the other end of each steel caisson is fixed with a guide groove, one side of the outer side of each steel corner column, which faces to the adjacent caisson component, is fixed with a guide groove, the two ends of each connecting steel box are fixed with convex rails, and a plurality of steel caissons and one connecting steel box are arranged in the underground continuous wall between the adjacent steel corner columns;
the steel caisson and the connecting steel box comprise an inner steel plate and an outer steel plate which are positioned on the inner side and the outer side of the underground continuous wall body and a pair of longitudinal steel plates which are vertical to the inner steel plate and the outer steel plate, and the inner steel plate and the outer steel plate are detachably connected with the longitudinal steel plates;
the steel corner columns and the caisson components are vertically divided into a plurality of sections, and the caisson components of all the sections are equal in height;
the construction method comprises the following working steps:
1) and (3) drilling steel corner columns at the joint parts of the single underground continuous walls: hoisting the steel angle post by a crane, taking soil in the steel angle post by mechanical equipment, sinking the steel angle post, and sequentially sinking the steel angle posts of all sections into soil to a designed elevation; each section of the steel corner post is welded and connected; the top end of the steel corner post is fixedly connected with a starting guide post, a guide groove at the side part of the steel corner post extends to the top end of the starting guide post, and the starting guide post is exposed out of the ground by a plurality of meters;
2) sinking caisson components between adjacent steel corner columns into a soil body:
the construction scheme of the caisson components one by one: hoisting the first section of the caisson component next to the steel corner post, leading in by using a guide mechanism of the opposite joint surface of the side part of the caisson component, the initial guide post and the steel corner post, taking soil in the caisson component by using mechanical equipment, sinking the first section of the caisson component into soil, then gradually sinking the rest caisson components in the same row into the soil from the steel corner posts at two ends to the middle part of the single underground continuous wall according to the arrangement sequence, leading the opposite surfaces of the caisson component pre-sunk into the soil in the adjacent caisson components by matching the guide mechanism, and synchronously taking soil from the section to be sunk into the soil above the ground of the caisson component pre-sunk into the soil and the adjacent section of the caisson component not sunk into the soil;
the same-row caisson component simultaneous construction scheme is as follows: arranging a plurality of caisson members among the steel angle columns on the ground, meshing the guide grooves among the caisson members with the convex rails, simultaneously taking soil in each caisson member by using mechanical equipment, and simultaneously sinking the caisson members of the same section;
3) the inner steel plates and the outer steel plates of the upper and lower adjacent sections of the caisson component are correspondingly welded and connected;
4) removing the steel caissons and the longitudinal steel plates connecting the steel caissons;
5) replacing slurry in a groove formed by sealing an inner steel plate and an outer steel plate;
6) inserting a steel reinforcement cage into a groove formed by sealing the inner steel plate and the outer steel plate and pouring concrete, and pouring concrete into the steel corner post;
7) and cutting off the initial guide pillar at the top of the steel corner pillar.
Preferably, the two ends of the steel plate at the inner side and the steel plate at the outer side of the steel caisson are respectively welded with a convex rail and a guide groove, and the two ends of the steel plate at the inner side and the steel plate at the outer side of the connecting steel caisson are respectively welded with a convex rail.
Preferably, the longitudinal steel plate of the caisson component is bent into a groove shape, round holes are formed in the corresponding positions of the bent part of the longitudinal steel plate and the adjacent outer side steel plate and inner side steel plate at the upper end of each section of the caisson component, steel rods are inserted into the corresponding round holes of the longitudinal steel plate of each section of the caisson component, the outer side steel plate and the inner side steel plate when each section of the caisson component is immersed, the steel rods are pulled out after each section of the caisson component is immersed in the soil body, and the steps are repeated until all the sections of the caisson component are immersed in place and then the steel rods are pulled out.
Preferably, the steel corner post is formed by welding a steel plate or a steel plate and profile steel in a surrounding mode, the steel corner post is connected with the starting guide post in a welding mode, and the guide groove on the outer side of the steel corner post is connected with the steel plate or the profile steel forming the steel corner post in a welding mode.
Preferably, the outer edges of the inner steel plate and the outer steel plate of each section of the steel corner post, the connecting steel box and the steel caisson are kept flush.
Preferably, soil between the inner steel plate and the outer steel plate is mechanically crushed by one or more of a punching machine, a drilling machine, a rotary digging machine, a screw pile machine, a stirring pile machine and a double-wheel mill; or high-pressure water direct flushing and high-pressure rotary jet pile rotary water spraying crushing are adopted; or mechanical and hydraulic combined crushing is adopted.
Preferably, the insertion of the reinforcement cage is performed before the concrete is poured or before the initial setting after the concrete is poured.
Preferably, the depth of concrete pouring in the steel caisson is greater than or equal to the depth of a steel reinforcement cage, and the depth of the steel reinforcement cage is greater than or equal to the depth of the caisson member.
Preferably, the outer steel plate is pulled out and recovered after the underground structure is constructed.
Compared with the prior art, the invention has the following beneficial effects: 1. the wall reinforcement and the guide wall which are usually done in the prior art of the traditional underground continuous wall are cancelled, the water stop (comprising a superposed wall, a composite wall, a high-pressure jet grouting pile on the soil facing side and the like) which is necessary to be done in the later stage of the traditional underground continuous wall is cancelled, the construction period is greatly shortened (about half of the conventional construction period), the efficiency is greatly improved, and the adverse effect of the construction on the city is greatly reduced; 2. the underground continuous wall is continuously constructed and integrally formed, so that the quality problem between wall panels inevitably caused by one-panel construction and jumping construction of the traditional underground continuous wall is avoided; 3. the underground continuous wall cast between the inner steel plate and the outer steel plate has excellent quality, which is far superior to the cast quality of the traditional underground continuous wall; 4. the construction can be carried out by adopting small-sized construction machines, the requirements on construction operation sites and the requirements on leasing and using large-sized machinery are reduced, and the manufacturing cost and rent are saved; 4. the cost is reduced, the construction period is shortened, risks and adverse effects on the society are reduced, and the economic and social benefits are remarkable.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of a steel corner post according to the present invention.
Fig. 3 is a large cross-sectional view of the steel caisson of the present invention.
FIG. 4 is a cross-sectional view of a steel caisson for connection according to the present invention.
FIG. 5 is a large view of the joint of the steel caisson of the present invention.
Fig. 6 is a schematic view of an embodiment of the construction scheme of the invention for caisson-member by caisson member.
In the figure: 1. a steel caisson; 11. an outer steel plate; 12. an inner steel plate; 13. a longitudinal steel plate; 21. a guide groove; 22. a raised rail; 3. connecting the steel boxes; 31. an outer steel plate; 32. an inner steel plate; 33. a longitudinal steel plate; 4. a reinforcement cage; 5. concrete; 6. a steel corner post; 7. the steel bar, 8, initial guide pillar, 911, 1# steel caisson section, 92, 2# steel caisson section, 912, 1# steel caisson section.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 5, the method for constructing the underground continuous wall by using the steel caisson technology comprises a single underground continuous wall and steel corner posts 6 which are positioned at the joint of the single underground continuous wall and fixedly connected with the single underground continuous wall, wherein the single underground continuous wall is formed by arranging and connecting a plurality of caisson components, and the caisson components comprise a steel caisson 1 and a connecting steel caisson 3;
guide mechanisms consisting of convex rails and guide grooves are arranged between the steel corner post 6 and the adjacent caisson components and on the opposite surfaces of the adjacent caisson components in the single underground continuous wall;
in the embodiment, one end of each steel caisson 1 is fixed with a convex rail 22, the other end of each steel caisson is fixed with a guide groove 21, one side of the outer side of each steel corner post 6, which faces to an adjacent caisson component, is fixed with the guide groove 21, two ends of each connecting steel caisson are fixed with the convex rails 22, and a plurality of steel caissons 1 and one connecting steel caisson 3 are arranged in an underground continuous wall between the adjacent steel corner posts;
in this embodiment, the caisson component adjacent to the steel corner post 6 is the steel caisson 1.
The steel caisson and the connecting steel box comprise an inner steel plate 12/32, an outer steel plate 11/31 and a pair of longitudinal steel plates 13/33, wherein the inner steel plate 12/32 and the outer steel plate are positioned on the inner side and the outer side of the underground continuous wall body, the longitudinal steel plates 13/33 are perpendicular to the inner steel plate and the outer steel plate, and the inner steel plate 12/32 and the outer steel plate 11/31 are detachably connected with the longitudinal steel plate 13/33;
the steel corner columns and the caisson components are vertically divided into a plurality of sections, and the caisson components of all the sections are equal in height;
the construction method comprises the following working steps:
1) and (3) drilling steel corner posts 6 at the joint parts of the single underground continuous walls: hoisting the steel angle post 6 by a crane, taking soil in the steel angle post 6 by mechanical equipment, sinking the steel angle post 6, and sequentially sinking the steel angle posts 6 of all sections into soil to a designed elevation; each section of the steel corner post 6 is welded and connected; the top end of the steel corner post 6 is fixedly connected with a starting guide post 8, a guide groove 21 at the side part of the steel corner post 6 extends to the top end of the starting guide post 8, and the starting guide post is exposed out of the ground by several meters;
2) sinking caisson components between the adjacent steel corner columns 6 into the soil body:
the construction scheme of caisson components one by one: hoisting the first segment of the caisson component next to the steel corner post, guiding the first segment of the caisson component into the soil body by using a guide mechanism of the opposite joint surface of the side part of the caisson component, the initial guide post and the steel corner post, taking soil in the caisson component by using mechanical equipment, sinking the first segment of the caisson component into the soil body, then gradually sinking the rest caisson components in the same row into the soil body from the steel corner posts at two ends to the middle part of the single-piece underground continuous wall according to the arrangement sequence, guiding the opposite surfaces of the caisson component pre-sunk into the soil in the adjacent caisson components by matching the guide mechanism, and synchronously taking soil and sinking the segment of the caisson component to be sunk into the soil and the segment of the caisson component not pre-sunk into the soil in the caisson component pre-sunk into the soil above the ground;
as shown in fig. 6, taking the adjacent caisson members as steel caissons as an example, among the adjacent 1# steel caisson and 2# steel caisson, the 1# steel caisson and 2# steel caisson are arranged in order, and if the first section 911 of the 1# caisson is already sunk in the soil, the soil taking and sinking operation can be performed simultaneously with the first section 92 of the 2# steel caisson when the second section 912 of the 1# caisson is sunk.
The same-row caisson component simultaneous construction scheme is as follows: arranging a plurality of caisson members among the steel angle columns 6 on the ground, meshing the guide grooves among the caisson members with the convex rails, simultaneously taking soil in each caisson member, and simultaneously sinking the caisson members of the same section;
3) the inner steel plate 12/32 and the outer steel plate 11/31 of the upper and lower adjacent sections of the caisson component are correspondingly welded and connected;
4) removing the steel caissons and the longitudinal steel plates connecting the steel caissons;
5) replacing the slurry in the groove formed by sealing the inner steel plate 12/32 and the outer steel plate 11/31;
6) inserting a reinforcement cage 4 into a groove formed by sealing an inner steel plate 12/32 and an outer steel plate 11/31, pouring concrete 5 into the groove, and pouring concrete into a steel corner post 6;
7) the starting guide post 8 at the top of the steel corner post 6 is cut off.
In this embodiment, the protruding rails 22 and the guide grooves 21 are respectively welded to two ends of the inner steel plate 12 and the outer steel plate 11 of the steel caisson, and the protruding rails 22 are respectively welded to two ends of the inner steel plate 32 and the outer steel plate 31 of the connecting steel caisson.
In this embodiment, the longitudinal steel plates of the caisson members are bent into a groove shape, round holes are formed at the corresponding positions of the bent part of the longitudinal steel plate and the adjacent outer steel plate 11/31 and inner steel plate 12/32 at the upper end of each section of the caisson member, when the caisson member is sunk into each section of the caisson member, the steel rods 7 are inserted into the corresponding round holes of the longitudinal steel plate of each section of the caisson member, the outer steel plate 11/31 and the inner steel plate 12/32, the steel rods 7 are pulled out after each section of the caisson member is sunk into the soil body, and the process is repeated until all the sections of the caisson member are sunk into position, and the steel rods 7 are pulled out. After the steel bar 7 is pulled out, the longitudinal steel plate can be separated from the outer side steel plate 11/31 and the inner side steel plate 12/32, so that the longitudinal steel plate can be recycled and the diaphragm wall can be continuous.
In this embodiment, the steel corner post 6 is formed by welding a steel plate or a steel plate and a section steel in a surrounding manner, the steel corner post 6 is welded to the start guide post 8, and the guide groove 21 on the outer side of the steel corner post 6 is welded to the steel plate or the section steel forming the steel corner post 6.
In this embodiment, the outer edges of the steel corner post 6, the inner steel plate 32/12 and the outer steel plate 31/11 of each section of the connecting steel box and the steel caisson are kept flush, so that the assembly and the surface leveling of the diaphragm wall are facilitated.
In the embodiment, soil between the inner steel plate 12/32 and the outer steel plate 11/31 is mechanically crushed by one or more of a punching machine, a drilling machine, a rotary excavating machine, a screw pile machine, a stirring pile machine and a double-wheel milling machine; or high-pressure water direct flushing and high-pressure rotary jet pile rotary water spraying crushing are adopted; or mechanical and hydraulic combined crushing is adopted.
In this embodiment, the insertion of the reinforcement cage 4 may be performed before the concrete 5 is poured, or may be performed before the initial setting after the concrete 5 is poured.
In this embodiment, the depth of concrete 5 pouring in the steel caisson is greater than or equal to the depth of the reinforcement cage 4, and the depth of the reinforcement cage 4 is greater than or equal to the depth of the caisson member.
In the embodiment, the outer steel plate can be pulled out and recovered as required after the underground structure is constructed, so that the cost is reduced.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (7)
1. The method for constructing the underground continuous wall by using the steel caisson technology is characterized by comprising a single underground continuous wall and steel corner columns which are positioned at the joint of the single underground continuous wall and are fixedly connected with the single underground continuous wall, wherein the single underground continuous wall is formed by arranging and connecting a plurality of caisson components, and the caisson components comprise steel caissons and connecting steel boxes;
guide mechanisms consisting of convex rails and guide grooves are arranged between the steel corner posts and the adjacent caisson components and on the opposite surfaces of the adjacent caisson components in the single underground continuous wall;
one end of each steel caisson is fixed with a convex rail, the other end of each steel caisson is fixed with a guide groove, one side of the outer side of each steel corner column, which faces to the adjacent caisson component, is fixed with a guide groove, the two ends of each connecting steel box are fixed with convex rails, and a plurality of steel caissons and one connecting steel box are arranged in the underground continuous wall between the adjacent steel corner columns;
the steel caisson and the connecting steel box comprise an inner steel plate and an outer steel plate which are positioned on the inner side and the outer side of the underground continuous wall body and a pair of longitudinal steel plates which are vertical to the inner steel plate and the outer steel plate, and the inner steel plate and the outer steel plate are detachably connected with the longitudinal steel plates;
the steel corner columns and the caisson components are vertically divided into a plurality of sections, and the caisson components of all the sections are equal in height;
the construction method comprises the following working steps:
1) and (3) drilling steel corner columns at the joint parts of the single underground continuous walls: hoisting the steel angle column by a crane, taking soil in the steel angle column by mechanical equipment, sinking the steel angle column, and sequentially sinking the steel angle columns of all sections into soil to reach a designed elevation; each section of the steel corner post is welded and connected; the top end of the steel corner post is fixedly connected with a starting guide post, a guide groove at the side part of the steel corner post extends to the top end of the starting guide post, and the starting guide post is exposed out of the ground by a plurality of meters;
2) sinking caisson components between adjacent steel corner columns into a soil body:
the construction scheme of the caisson components one by one: hoisting the first section of the caisson component next to the steel corner post, leading in by using a guide mechanism of the opposite joint surface of the side part of the caisson component, the initial guide post and the steel corner post, taking soil in the caisson component by using mechanical equipment, sinking the first section of the caisson component into soil, then gradually sinking the rest caisson components in the same row into the soil from the steel corner posts at two ends to the middle part of the single underground continuous wall according to the arrangement sequence, leading the opposite surfaces of the caisson component pre-sunk into the soil in the adjacent caisson components by matching the guide mechanism, and synchronously taking soil from the section to be sunk into the soil above the ground of the caisson component pre-sunk into the soil and the adjacent section of the caisson component not sunk into the soil;
the same-row caisson component simultaneous construction scheme is as follows: arranging a plurality of caisson members among the steel angle columns on the ground, meshing the guide grooves among the caisson members with the convex rails, simultaneously taking soil in each caisson member by using mechanical equipment, and simultaneously sinking the caisson members of the same section;
3) the inner steel plates and the outer steel plates of the upper and lower adjacent sections of the caisson component are correspondingly welded and connected;
4) removing the steel caissons and the longitudinal steel plates connecting the steel caissons;
5) replacing slurry in a groove formed by sealing an inner steel plate and an outer steel plate;
6) inserting a steel reinforcement cage into a groove formed by sealing the inner steel plate and the outer steel plate and pouring concrete, and pouring concrete into the steel corner post;
7) cutting off a starting guide pillar at the top of the steel corner post;
the two ends of the steel plate at the inner side and the steel plate at the outer side of the steel caisson are respectively welded with a convex rail and a guide groove, and the two ends of the steel plate at the inner side and the steel plate at the outer side of the connecting steel caisson are respectively welded with a convex rail;
the longitudinal steel plate of the caisson component is bent into a groove shape, round holes are formed in the bent part of the longitudinal steel plate and the corresponding positions of the adjacent outer side steel plate and the inner side steel plate at the upper end of each section of the caisson component, steel rods are inserted into the corresponding round holes of the longitudinal steel plate of each section of the caisson component, the outer side steel plate and the inner side steel plate when each section of the caisson component is immersed, the steel rods are pulled out after each section of the caisson component is immersed in a soil body, and the process is repeated until all the sections of the caisson component are immersed in place and then the steel rods are pulled out.
2. The method for constructing an underground diaphragm wall using the steel caisson technology as claimed in claim 1, wherein the steel corner posts are formed by welding steel plates or steel plates and section steel, the steel corner posts are welded to the starting guide pillars, and the guide grooves formed at the outer sides of the steel corner posts are welded to the steel plates or section steel forming the steel corner posts.
3. A method of constructing an underground diaphragm wall using the steel caisson technique according to claim 1, wherein the steel corner posts, the connecting steel caisson, and the outer edges of the inner and outer steel plates of each segment of the steel caisson are kept flush.
4. The method for constructing an underground diaphragm wall by using the steel caisson technology as claimed in claim 1, wherein the soil between the inner steel plate and the outer steel plate is mechanically crushed by one or more of a rotary excavator, a screw pile driver, a mixing pile driver and a double-wheel mill; or high-pressure water direct flushing and high-pressure rotary jet pile rotary jet water crushing are adopted; or mechanical and hydraulic combined crushing is adopted.
5. A method of constructing an underground diaphragm wall using the steel caisson technique according to claim 1, wherein the insertion of the reinforcement cage is performed before the concrete is poured or before the initial setting after the concrete is poured.
6. A method of constructing an underground diaphragm wall using the steel caisson technique of claim 5, wherein the depth of the concrete pour in the steel caisson is greater than or equal to the depth of the steel reinforcement cage, which is greater than or equal to the depth of the caisson member into the ground.
7. The method for constructing an underground diaphragm wall using the steel caisson technology as claimed in claim 6, wherein the external steel inserting plate is pulled out and recovered after the construction of the underground structure is completed.
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