CN111236972B - Multi-pipe parallel jacking system for small section of underground passage and construction method - Google Patents
Multi-pipe parallel jacking system for small section of underground passage and construction method Download PDFInfo
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- CN111236972B CN111236972B CN202010151450.6A CN202010151450A CN111236972B CN 111236972 B CN111236972 B CN 111236972B CN 202010151450 A CN202010151450 A CN 202010151450A CN 111236972 B CN111236972 B CN 111236972B
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- 238000010276 construction Methods 0.000 title claims abstract description 38
- 238000011065 in-situ storage Methods 0.000 claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 239000004567 concrete Substances 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 230000000007 visual effect Effects 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/005—Props; Chocks, e.g. made of flexible containers filled with backfilling material characterised by the material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a multi-pipe parallel jacking system with a small section of an underground passage. The cast-in-situ replacement beam column structure comprises a small-section pipe-jacking pipe section used for forming a basic space of an underground passage and bearing stratum pressure, a cast-in-situ replacement beam column structure used for replacing a side wall of the small-section pipe-jacking pipe section, an auxiliary tunnel pipe-jacking structure used for providing an operation space for cast-in-situ construction of the cast-in-situ replacement beam column structure, and a temporary support system used for temporarily bearing the top load of the small-section pipe-jacking pipe section when the side wall of the small-section pipe-jacking pipe section is removed and before the cast-in-situ replacement beam column structure is stressed. The invention also provides a construction method of the underground passage small-section multi-pipe parallel jacking system, which comprises the steps of jacking construction of small-section pipe joints by pipe according to the sequence of the middle and the two sides, constructing an auxiliary tunnel pipe jacking structure and building a temporary supporting system; removing the section steel member part section by section, and installing the steel bar planting, the binding reinforcement cage and the template of the cast-in-situ replacement beam column structure; and (3) concrete pouring construction, namely removing the temporary support system, and constructing in sequence until finishing.
Description
Technical Field
The invention relates to the technical field of tunnel construction by a pipe jacking method and underground engineering equipment, in particular to a small-section multi-pipe parallel jacking system for an underground passage and a construction method.
Background
The pipe jacking technology is a construction technology adopted in the construction of underground pipelines when various obstacles such as railways, roads, rivers or buildings are traversed, and is widely used for the construction of urban traffic sidewalks and underground common ditches in recent years. The traditional large-section rectangular pipe-jacking tunnel construction adopts a large pipe-jacking machine with the same size as the excavated section to carry out pushing construction, so that the construction technology of pipe jacking is complex, the ground subsidence is difficult to control, the pipe joint is difficult to manufacture and transport, large counter-force wall facilities are needed, and the construction method is difficult to implement especially in surrounding sensitive building dense areas. Therefore, in the actual design construction process, in order to solve the above problem, a large-span channel space is generally divided into a plurality of small-span spaces for jacking construction respectively, so as to form a multi-pipe parallel underground space type. Although the method can effectively avoid the related technical problems caused by the traditional large-section rectangular pipe jacking construction, improves the applicability of pipe jacking construction, and because each pipe jacking structure is an independent space system, the built underground passage has narrow space and poor visual effect, brings strong psychological depression to people and is inconvenient for large equipment and facilities to enter and exit during operation. Therefore, expanding a small space into a large space to solve the problem of visual space effect becomes another problem in the field.
Disclosure of Invention
The invention aims to provide a small-section multi-pipe parallel jacking system of an underground passage and a construction method, which solve the problem of poor visual space effect caused by adopting a plurality of small-section jacking pipe parallel schemes in the construction process of the large-section underground passage.
In order to achieve the above purpose, the invention provides a small-section multi-pipe parallel jacking system of an underground passage, which comprises a small-section pipe-jacking pipe joint, a cast-in-situ replacement beam column structure, an auxiliary tunnel pipe-jacking structure and a temporary supporting system; the small-section pipe-jacking pipe joint is used for forming a basic space of an underground passage and bearing external loads such as stratum pressure and the like; the cast-in-situ replacement beam column structure spans the side walls of two adjacent small-section jacking pipe joints; the device is used for replacing the side wall of the small-section pipe section of the pipe jacking pipe, and expanding visual space; the auxiliary tunnel pipe jacking structure is ridden over the side walls of two adjacent small-section pipe jacking pipe joints; the method is used for providing an operation space for cast-in-situ construction of the cast-in-situ replacement beam column structure; the temporary supporting system is arranged inside the small-section pipe-jacking pipe joint and is used for temporarily bearing the top load of the small-section pipe-jacking pipe joint when the side wall of the small-section pipe-jacking pipe joint is removed and before the cast-in-situ replacement beam column structure is stressed.
Preferably, the small-section pipe-jacking pipe joint is of a round-angle frame type steel-concrete assembly structure, each section is 1.5m long and comprises a reinforced concrete prefabricated part with a C-shaped section and a section steel member part for closing a C-shaped opening of the reinforced concrete prefabricated part; the reinforced concrete prefabricated part and the section steel member part are detachably connected through a connecting assembly.
Preferably, the section steel member part comprises 3 vertical poles and a back plate, the 3 vertical poles are arranged at intervals, the side faces of the vertical poles are detachably connected with the plate face of the back plate through bolts, and the side wall of the small-section pipe jacking pipe joint is formed.
Preferably, the vertical upright rods are processed by I-steel, and are longitudinally distributed along the small-section pipe-jacking pipe joints at intervals of 0.5 m/root; the backboard is a rectangular board made of a 1cm thick steel plate;
Preferably, the connection assembly comprises a sleeve and a connector; the sleeve is a 30cm long customized steel pipe with internal threads, is longitudinally arranged at intervals of 20cm in a double-layer manner, and is uniformly embedded in the small-section pipe jacking pipe section adjacent to the part of the profile steel member; the connecting piece comprises a 1cm thick square steel backing plate and bolts, wherein the backing plate and the bolts are arranged at the end part of the vertical rod, the bolts penetrate through the backing plate to be screwed with the sleeves, and the number of the bolts corresponds to the number of the sleeves one by one. The bolts are foundation bolts, and the number of the bolts is four; the number of the backing plates is two, and the backing plates are respectively arranged at the joint of the reinforced concrete prefabricated part and the section steel member part and detachably connected through the foundation bolts.
Preferably, the cast-in-situ replacement beam column structure consists of a cast-in-situ replacement top beam, a cast-in-situ replacement column and a cast-in-situ replacement ground beam, and is a reinforced concrete structure; the cast-in-situ replacement top beam is positioned at the upper part of the side wall, is connected with the adjacent two small-section top pipe joint top plates in a combined manner in a bar planting mode, and is arranged along the longitudinal direction of the underground passage in a through length mode; the cast-in-situ replacement columns are positioned in the middle of the side wall, are uniformly arranged at intervals along the longitudinal direction of the underground passage, have a distance of 4.5m, and are respectively combined with the cast-in-situ replacement top beam and the cast-in-situ replacement ground beam at the upper end and the lower end to be cast-in-situ; the cast-in-situ replacement ground beam is positioned at the lower part of the side wall, is connected with the adjacent two small-section pipe-jacking pipe joint bottom plates in a combined manner in a bar planting mode, and is arranged along the longitudinal direction of the underground passage in a through length mode.
Preferably, the auxiliary tunnel jacking pipe structure is a reinforced concrete pipe section structure with a rectangular section; the bottom plate of the auxiliary tunnel jacking pipe structure is uniformly provided with a plurality of holes, and an operation surface is provided for cast-in-situ construction of the cast-in-situ replacement beam column structure.
Preferably, the side length of the section of the auxiliary tunnel jacking pipe structure is 1-2 m, and the length of a pipe section is 3-4.5 m; the open pore is a rectangular structure with the side length of 0.5-1 m.
Preferably, the temporary support system comprises a profile steel combined longitudinal beam and a steel pipe column; the profile steel combined longitudinal beam is arranged at the upper end of the steel pipe upright post and is detachably connected through bolts, and is longitudinally installed along the underground passage in a full length mode; the steel pipe stand columns stand on the bottom plate of the small-section pipe-jacking pipe joint and are uniformly arranged at intervals along the longitudinal direction of the underground passage, and the distance is 3m.
The invention also provides a construction method of the underground passage small-section multi-pipe parallel jacking system, which comprises the following steps:
step one: jacking and constructing the small-section pipe-jacking pipe joints in a pipe-jacking mode according to the sequence of the middle part and the two sides, so as to form a channel space with multiple parallel pipes but independent from each other;
step two: constructing the auxiliary tunnel pipe-jacking structure above the side walls of the adjacent two small-section pipe-jacking joints to be replaced, wherein the bottom surface of the auxiliary tunnel pipe-jacking structure is clung to the upper top surface of the constructed small-section pipe-jacking joint, and spans the thickness range of the side walls of the adjacent pipe-jacking joints;
Step three: setting up the temporary support system in the constructed small-section top pipe section;
Step four: removing the section steel member parts of the assembled side wall of the small-section pipe-jacking pipe joint section by section, wherein the removing range of each time is one space between cast-in-situ replacement columns, and removing a middle clamp soil body;
Step five: finishing the procedures of planting the steel bars, binding the steel reinforcement cages and installing the templates of the cast-in-situ replacement beam column structure in the range of dismantling the section steel member part of the assembled side wall;
Step six: concrete pouring construction is carried out on the cast-in-situ replacement beam column structure of the current paragraph from the auxiliary tunnel jacking pipe structure, and the temporary support system is removed for a specified time of curing;
step seven: and repeating the third step to the sixth step until all replacement work is completed.
The technical scheme of the invention has the following beneficial effects:
(1) In the invention, the large-span underground passage is divided into multiple parallel small-span jacking pipes for jacking construction, the single excavation section is small, a large pushing counter-force wall is not needed, the disturbance to the surrounding environment is small, and the settlement deformation of the stratum can be well controlled;
(2) In the invention, the small-section pipe-jacking joints are arranged in parallel, the weight of a single small-section pipe-jacking joint is relatively light, and the hoisting and the transportation are convenient;
(3) According to the invention, the assembled steel structure side wall is adopted, so that the assembly and disassembly are convenient, the dead weight of the pipe joint is reduced, meanwhile, the steel structure can be reused, and the material cost is saved;
(4) According to the invention, the replacement beam column is constructed in a cast-in-situ mode, the integrity is good, an effective working surface is provided by arranging the auxiliary tunnel pipe-jacking structure at the top, the casting quality of the cast-in-situ concrete structure can be ensured, water and soil loss at the top of the small-section pipe-jacking pipe joint after the side wall is removed can be avoided, and further, excessive deformation or collapse of an overlying stratum is avoided, and the construction safety is improved.
(5) In the invention, the small-section pipe-jacking pipe joints are combined to form the large-section pipe-jacking pipe, so that the split is flexible and the applicability is strong.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the overall system of the present invention.
FIG. 2 is a construction view of a small section top pipe joint according to the present invention.
FIG. 3 is a block diagram of a cast-in-place replacement beam column of the present invention.
Fig. 4 is a structural diagram of the auxiliary tunnel jacking pipe according to the present invention.
Fig. 5 is a temporary support architecture diagram of the present invention.
Fig. 6a to 6f are main construction process drawings of the present invention.
Wherein, 1, a small-section top pipe joint, 11, a reinforced concrete prefabricated part, 12, a section steel component part, 121, a vertical upright rod, 122, a back plate, 13, a sleeve, 14, a connecting piece, 141, a backing plate, 142, a bolt, 2, a cast-in-situ replacement beam column structure, 21, cast-in-situ replacement top beams, 22, cast-in-situ replacement columns, 23, cast-in-situ replacement ground beams, 3, auxiliary tunnel top pipe structures, 31, rectangular open holes, 4, a temporary support system, 41, profile steel combined longitudinal beams, 42 and steel pipe columns.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1-6 f, an underground passage small-section multi-pipe parallel jacking system comprises a small-section jacking pipe section 1, a cast-in-situ replacement beam column structure 2, an auxiliary tunnel jacking pipe structure 3 and a temporary supporting system 4;
The small-section jacking pipe joint 1 is used for forming a basic space of an underground passage and bearing external loads such as stratum pressure and the like;
The cast-in-situ replacement beam column structure 2 spans the side walls of the adjacent two small-section jacking pipe joints 1; the device is used for replacing the side wall of the small-section pipe section of the pipe jacking pipe, and expanding visual space;
The auxiliary tunnel pipe jacking structure 3 rides over the side walls of two adjacent small-section pipe jacking pipe joints 1; the method is used for providing an operation space for cast-in-situ construction of the cast-in-situ replacement beam column structure;
The temporary support system 4 is arranged in the small-section pipe-jacking pipe joint 1 and is used for temporarily bearing the top load of the small-section pipe-jacking pipe joint when the side wall of the small-section pipe-jacking pipe joint is removed and before the cast-in-situ replacement beam column structure is stressed.
As shown in fig. 1 and 2, the small-section pipe-jacking pipe section 1 is a round-angle frame type steel-concrete assembly structure, three sections of small-section pipe-jacking pipe sections are arranged in parallel in the embodiment, and are respectively named as a left pipe, a middle pipe and a right pipe, and each section is 1.5m long; the small-section jacking pipe joint 1 comprises a reinforced concrete prefabricated part 11 with a C-shaped section and a section steel member part 12 for closing a C-shaped opening of the reinforced concrete prefabricated part;
the reinforced concrete prefabricated part 11 and the profile steel member part 12 are detachably connected through a connecting assembly;
The section steel member part 12 comprises 3 vertical rods 121 and a back plate 122,3 vertical rods 121 which are arranged at intervals, the side surfaces of the vertical rods 121 are detachably connected with the plate surface of the back plate 122 through bolts, and the side walls of the small-section pipe jacking pipe sections 1 are formed.
The vertical upright rods 121 are formed by processing I-steel, and are longitudinally distributed along the small-section jacking pipe joints 1 at intervals of 0.5 m/root; the back plate 122 is a rectangular plate made of a 1cm thick steel plate;
The connection assembly comprises a sleeve 13 and a connection piece 14; the sleeve 13 is a 30cm long customized steel pipe with internal threads, is longitudinally arranged at intervals of 20cm in a double-layer manner, and is uniformly embedded in the small-section jacking pipe section 1 adjacent to the section steel member part 12;
The connecting piece 14 comprises a 1cm thick square steel backing plate 141 and bolts 142 which are arranged at the end parts of the vertical rods, wherein the bolts 142 penetrate through the backing plate 141 and are screwed with the sleeves 13, and the number of the bolts 142 is in one-to-one correspondence with the sleeves 13. The bolts are foundation bolts, and the number of the bolts is four; the number of the backing plates is two, and the backing plates are respectively arranged at the joint of the reinforced concrete prefabricated part 11 and the profile steel member part 12 and are detachably connected through the foundation bolts 142.
As shown in fig. 1 and 3, the cast-in-situ replacement beam column structure 2 consists of a cast-in-situ replacement top beam 21, a cast-in-situ replacement column 22 and a cast-in-situ replacement ground beam 23, and is a reinforced concrete structure;
the cast-in-situ replacement top beam 21 is positioned at the upper part of the side wall, is connected with the top plates of the adjacent two small-section top pipe joints 1 in a combined manner in a bar planting manner, and is arranged along the longitudinal direction of the underground passage in a through length manner;
The cast-in-situ replacement columns 22 are positioned in the middle of the side wall, are uniformly arranged at intervals along the longitudinal direction of the underground passage, have a distance of 4.5m, and are respectively formed by combining and cast-in-situ with the cast-in-situ replacement top beam 21 and the cast-in-situ replacement ground beam 23 at the upper and lower ends;
the cast-in-situ replacement ground beam 23 is positioned at the lower part of the side wall, is connected with the bottom plates of the adjacent two small-section jacking pipe joints 1 in a combined manner in a bar planting mode, and is arranged along the longitudinal direction of the underground passage in a through length mode.
As shown in fig. 1 and 4, the auxiliary tunnel jacking pipe structure 3 is a reinforced concrete pipe section structure with a rectangular section; the bottom plate of the auxiliary tunnel jacking pipe structure 3 is uniformly provided with a plurality of holes 31, and an operation surface is provided for cast-in-situ construction of the cast-in-situ replacement beam column structure 2.
The side length of the section of the auxiliary tunnel jacking pipe structure 3 is 1-2 m, and the pipe section length is 3-4.5 m; the opening 31 has a rectangular structure with a side length of 0.5-1 m.
As shown in fig. 1 and 5, the temporary support system 4 comprises a profile steel composite longitudinal beam 41 and a steel pipe column 42;
the section steel combined longitudinal beam 41 is arranged at the upper end of the steel pipe upright post 42, is detachably connected through bolts, and is longitudinally installed along the underground passage in a full length mode;
The steel pipe stand columns 42 stand on the bottom plate of the small-section jacking pipe joint 1 and are uniformly arranged at intervals along the longitudinal direction of the underground passage, and the interval is 3m.
The construction method of the underground passage small-section multi-pipe parallel jacking system is characterized by comprising the following steps of:
Step one: the small-section jacking pipe joint 1 is constructed by jacking pipe by pipe according to the sequence of the middle and the two sides, so that a channel space with multiple parallel pipes but independent from each other is formed, as shown in fig. 6 a;
Step two: the auxiliary tunnel jacking pipe structure 3 is constructed above the side walls of the adjacent two small-section jacking pipe joints 1 to be replaced, the bottom surface of the auxiliary tunnel jacking pipe structure 3 is tightly attached to the upper top surface of the constructed small-section jacking pipe joint 1, and the adjacent jacking pipe joints are ridden over the thickness range of the side walls of the adjacent jacking pipe, as shown in fig. 6 b;
step three: the temporary supporting system 4 is erected in the constructed small-section top pipe section 1, as shown in fig. 6 c;
Step four: removing the assembly type side wall section 12 of the small-section pipe section 1 section by section, wherein the removing range of each time is the column spacing of one cast-in-situ displacement column 22, and removing the middle clamp soil body, as shown in fig. 6 d;
step five: finishing the procedures of planting the steel bars, binding the steel reinforcement cages and installing the templates of the cast-in-situ replacement beam column structure 2 within the range of dismantling the section steel member part 12 of the assembled side wall, as shown in fig. 6 e;
Step six: concrete pouring construction is carried out on the cast-in-situ replacement beam column structure 2 of the current section from the auxiliary tunnel jacking pipe structure 3, and the temporary support system 4 is removed for a specified time of curing, as shown in fig. 6 f;
step seven: and repeating the third step to the sixth step until all replacement work is completed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The multi-pipe parallel jacking system for the small section of the underground passage is characterized by comprising a small section jacking pipe joint (1), a cast-in-situ replacement beam column structure (2), an auxiliary tunnel jacking pipe structure (3) and a temporary supporting system (4);
The small-section jacking pipe joint (1) is used for forming a basic space of an underground passage and bearing stratum pressure;
the cast-in-situ replacement beam column structure (2) spans the side walls of two adjacent small-section jacking pipe joints (1); the device is used for replacing the side wall of the small-section pipe section of the pipe jacking pipe, and expanding visual space;
The auxiliary tunnel pipe jacking structure (3) is ridden over the side walls of two adjacent small-section pipe jacking pipe joints (1); the method is used for providing an operation space for cast-in-situ construction of the cast-in-situ replacement beam column structure;
The temporary support system (4) is arranged in the small-section pipe-jacking joint (1) and is used for temporarily bearing the top load of the small-section pipe-jacking joint when the side wall of the small-section pipe-jacking joint is removed and before the cast-in-situ replacement beam column structure is stressed;
The small-section jacking pipe joint (1) comprises a reinforced concrete prefabricated part (11) with a C-shaped section and a section steel component part (12) for closing a C-shaped opening of the reinforced concrete prefabricated part;
The reinforced concrete prefabricated part (11) and the profile steel member part (12) are detachably connected through a connecting assembly;
The connecting assembly comprises a sleeve (13) and a connecting piece (14); the sleeve (13) is a steel pipe with internal threads and is embedded in the small-section top pipe joint (1) adjacent to the section steel member part (12);
The connecting piece (14) comprises a base plate (141) and bolts (142) which are arranged at the end part of the vertical rod, the bolts (142) penetrate through the base plate (141) to be screwed with the sleeves (13), and the number of the bolts (142) corresponds to the number of the sleeves (13) one by one;
the cast-in-situ replacement beam column structure (2) consists of a cast-in-situ replacement top beam (21), a cast-in-situ replacement column (22) and a cast-in-situ replacement ground beam (23), and is a reinforced concrete structure;
The cast-in-situ replacement top beam (21) is positioned at the upper part of the side wall, is connected with the top plates of the adjacent two small-section top pipe joints (1) in a combined way through a bar planting way, and is arranged in a through length way along the longitudinal direction of the underground passage;
The cast-in-situ replacement columns (22) are positioned in the middle of the side wall and are uniformly arranged at intervals along the longitudinal direction of the underground passage, and the upper end and the lower end of the cast-in-situ replacement columns are respectively combined with the cast-in-situ replacement top beam (21) and the cast-in-situ replacement ground beam (23) in a cast-in-situ manner;
the cast-in-situ replacement ground beam (23) is positioned at the lower part of the side wall and is connected with the bottom plates of the adjacent two small-section jacking pipe joints (1) in a combined way by a bar planting way, and the cast-in-situ replacement ground beam is arranged along the longitudinal direction of the underground passage.
2. The underground passage small-section multi-pipe parallel jacking system according to claim 1, wherein the section steel component part (12) comprises a plurality of vertical uprights (121) and a back plate (122), the plurality of vertical uprights (121) are arranged at intervals, and the side surfaces of the vertical uprights (121) are detachably connected with the plate surface of the back plate (122) to form the side wall of the small-section pipe jacking pipe joint (1).
3. The underground passage small-section multi-pipe parallel jacking system according to claim 2, wherein the vertical uprights (121) are formed by machining I-steel, and are distributed longitudinally along the small-section jacking pipe sections (1) at equal intervals; the back plate (122) is a rectangular plate made of steel plates.
4. The underground passage small-section multi-pipe parallel jacking system according to claim 1, wherein the auxiliary tunnel jacking pipe structure (3) is a reinforced concrete pipe section structure with a rectangular section;
The bottom plate of the auxiliary tunnel jacking pipe structure (3) is uniformly provided with a plurality of openings (31) to provide an operation surface for cast-in-situ construction of the cast-in-situ replacement beam column structure (2).
5. The underground passage small-section multi-pipe parallel jacking system according to claim 4, wherein the side length of the section of the auxiliary tunnel jacking pipe structure (3) is 1-2 m, and the pipe section length is 3-4.5 m; the open hole (31) is of a rectangular structure with the side length of 0.5-1 m.
6. The underground passage small-section multi-pipe parallel jacking system according to claim 1, wherein the temporary supporting system (4) comprises a profile steel combined longitudinal beam (41) and a steel pipe upright post (42);
The profile steel combined longitudinal beam (41) is arranged at the upper end of the steel pipe upright post (42), is detachably connected through bolts, and is longitudinally installed along the underground passage in a full length mode;
the steel pipe stand columns (42) stand on the bottom plate of the small-section pipe-jacking pipe joint (1) and are uniformly arranged at intervals along the longitudinal direction of the underground passage.
7. A construction method of the underground passage small-section multi-pipe parallel jacking system according to any one of claims 1 to 6, characterized by comprising the following steps:
Step one: the small-section jacking pipe joint (1) is constructed by jacking pipe by pipe according to the sequence of the middle and the two sides, so that a channel space with multiple parallel pipes but independent from each other is formed;
Step two: constructing an auxiliary tunnel jacking pipe structure (3) above the side walls of two adjacent small-section jacking pipe joints (1) to be replaced, wherein the bottom surface of the auxiliary tunnel jacking pipe structure (3) is tightly attached to the upper top surface of the constructed small-section jacking pipe joint (1) and spans the thickness range of the side walls of the adjacent jacking pipe;
Step three: the temporary supporting system (4) is erected in the constructed small-section jacking pipe joint (1);
Step four: removing the assembly type side wall section steel member parts (12) of the small-section pipe-jacking section (1) section by section, wherein the removal range is the column spacing of one cast-in-situ replacement column (22) each time, and removing a middle clamp soil body;
Step five: finishing the procedures of planting the steel bars, binding the steel reinforcement cages and installing the templates of the cast-in-situ replacement beam column structure (2) within the range of dismantling the section steel member part (12) of the assembled side wall;
Step six: concrete pouring construction is carried out on the cast-in-situ replacement beam column structure (2) of the current section from the auxiliary tunnel jacking pipe structure (3), and the temporary supporting system (4) is removed after the concrete pouring construction is carried out for a specified time of curing;
step seven: and repeating the third step to the sixth step until all replacement work is completed.
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| CN116446926B (en) * | 2023-03-20 | 2024-05-14 | 深圳大学 | A structural conversion method for forming an integral subway station by double-hole close-fitting jacking pipe |
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