CN111236952A - Full-recovery assembly type rectangular pipe-jacking working well steel structure supporting device and construction method of working well - Google Patents
Full-recovery assembly type rectangular pipe-jacking working well steel structure supporting device and construction method of working well Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 220
- 239000010959 steel Substances 0.000 title claims abstract description 220
- 238000010276 construction Methods 0.000 title claims abstract description 85
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000009412 basement excavation Methods 0.000 claims description 18
- 240000004282 Grewia occidentalis Species 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 238000011065 in-situ storage Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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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
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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
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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Abstract
The invention discloses a full-recovery assembled rectangular pipe-jacking working well steel structure supporting device and a working well construction method thereof, wherein the supporting device comprises: prefabricating a ring beam, prefabricating a supporting structure, prefabricating a hole, prefabricating a back wall and sealing a bottom; the prefabricated supporting structure is formed by connecting H-shaped steel, profiled steel plates, corner columns and inner supports. The prefabricated ring beam is provided with embedded parts connected with the H-shaped steel and the corner columns. The prefabricated supporting structure comprises a prefabricated component and a prefabricated supporting structure body. The prefabricated hole comprises an inner hole structure and an outer hole structure, and the inner hole structure and the outer hole structure can be disassembled, so that the construction of the jacking pipe in and out of the hole is met. A flange plate capable of fixing a water stop strip is arranged on the outer opening, so that slurry leakage is avoided when the pipe jacking machine jacks in; the design philosophy of prefabricated back wall, prefabricated entrance to a cave and prefabricated supporting construction integration construction can satisfy the supporting requirement of rectangle working well, realizes supporting construction's repeated reuse, practices thrift construction period and cost, avoids concrete structure to remain the problem such as influence to later stage construction.
Description
Technical Field
The invention relates to the field of construction of municipal infrastructure and other infrastructure, in particular to a steel structure supporting device of a full-recovery assembled rectangular pipe-jacking working well and a construction method of the working well.
Background
The pipe jacking construction is used as a typical trenchless tunnel construction technology, and the pipe jacking construction technology has the characteristics of being fast in construction speed, small in influence on ground traffic, high in construction quality, free of excavation of along-line strata, low in comprehensive construction cost and the like, and is widely applied to tunnel construction with medium and small calibers. A large number of pipe jacking wells need to be built in the construction process, and the types of the pipe jacking wells comprise a working well, a receiving well, an intermediate well and the like.
The traditional construction method of the pipe jacking well generally comprises a steel sheet pile, a cast-in-place open caisson, a cast-in-place pile, a ground connecting wall and the like, and also comprises a prefabricated open caisson support (CN 202559384U), a pile-first and then-hanging plate support (CN 110485472A) and a prefabricated steel structure support (CN 206159648U). Noise pollution can be generated in the piling construction, the deformation of a foundation can be caused by the vibration in the construction, the safety of surrounding buildings (structures) is influenced, and pores can be generated in the stratum in the pile pulling process; accidents such as inclination, deviation and the like easily occur in open caisson construction, and the requirement on the construction process is high; the concrete of the cast-in-situ bored pile and the underground diaphragm wall has long solidification time, heavy construction machinery, high construction cost and can not be recycled; the prefabricated steel structure supporting technology does not solve the problems of insufficient strength of the back rest and prefabrication of the opening.
At present, in municipal pipelines and tunnel construction, pipe jacking technology is mostly adopted for construction. In the pipe-jacking construction process, pipe-jacking working wells such as an originating well, a middle well and a receiving well need to be built. However, the existing pipe jacking working well is mostly constructed by adopting a reinforced concrete structure, and has the problems of serious pollution, non-reutilization, low resource utilization rate and the like. The construction is also carried out by adopting steel sheet piles, but the technology is suitable for shallow foundation pit construction and has poor control effect on the deformation of the peripheral stratum. There have been some previous studies on the fabricated construction of circular pipe-jacking working wells (CN 110485472 a, CN203755315U), but the stress conditions of rectangular working wells are more complicated than those of circular working wells.
Disclosure of Invention
The invention aims to provide a steel structure supporting device of a fully-recycled assembly type rectangular pipe-jacking working well and a construction method of the working well, and provides a design idea of integrated construction of a prefabricated back wall, a prefabricated hole opening and a prefabricated supporting structure, so that the supporting requirement of the rectangular working well can be met, the supporting structure can be recycled, the construction period and the construction cost can be saved, and the problems of influence of concrete structure residues on later-stage construction and the like can be avoided.
A construction method of a full-recovery assembled rectangular pipe-jacking working well,
1) construction prefabricated ring beam
Measuring and paying off in a construction site, and excavating a foundation trench to meet the requirement of prefabricated ring beam installation;
laying a cushion layer, placing the prefabricated ring beam to the position of the foundation trench, leveling, connecting and fixing;
2) excavation supporting first section
Excavating a first layer of earthwork;
the earth excavation depth is matched with the height of the assembled first ring structure;
four corner posts and first ring H-shaped steel are respectively spliced and connected with the prefabricated ring beam, the corner posts are positioned at four corner positions of the rectangular working well, and the first ring H-shaped steel is tightly attached to the bottom surface of the prefabricated ring beam;
fixedly connecting the H-shaped steel with the corner post node through a bolt;
fixing a first ring-shaped profiled steel plate and first ring-shaped H-shaped steel through bolts, wherein the first ring-shaped profiled steel plate is positioned below the first ring-shaped H-shaped steel;
installing a first-layer inner support, which comprises an angle support, a butt support and a splayed support, and fixing the first-layer inner support and the first ring H-shaped steel through bolts;
grouting and filling construction is carried out behind the first ring supporting structure;
sequentially and alternately excavating earthwork, assembling corner columns, H-shaped steel, profiled steel sheets and inner supports, and completing assembling connection and grouting construction until an excavation support reaches the top surface of a back wall (or a cave entrance);
3) second section of excavation support
Excavating earthwork;
mounting corner posts at four corners, assembling a prefabricated opening structure at the opening side, assembling a prefabricated back wall structure at the back wall side, assembling H-shaped steel and profiled steel plates at the other two sides, fixedly connecting all structures with the intersected nodes of the corner posts through bolts, and fixedly connecting all structures with the previous ring structure through bolts;
mounting an inner support, wherein the inner support comprises an angle support and a butt support, and the inner support and the H-shaped steel of the corresponding ring are fixed through bolts;
grouting and filling construction is carried out behind the supporting structure;
sequentially and alternately excavating an earth assembling hole structure, a back wall structure, H-shaped steel, profiled steel sheets, corner columns and inner supports, and completing assembling connection and grouting construction until an excavation support reaches the elevation of the bottom surface of a vertical shaft;
installing a longitudinal through long upright post, and tightly connecting the longitudinal through long upright post with each ring of H-shaped steel by using a high-strength bolt, wherein the bottom end of the through long upright post needs to be deeper than the bottom surface of the vertical shaft;
4) back cover
Pouring bottom sealing concrete in situ, and ensuring that the four-corner upright columns and the through long upright columns are embedded in the bottom sealing concrete;
5) construction of support change
Dismantling the butt brace and the splayed brace and providing a pipe jacking construction working surface;
6) pipe jacking construction
Jacking or receiving construction of the jacking pipe is carried out;
7) backfill recovery
And (4) dismantling the supporting structure layer by layer from the bottom of the well upwards, backfilling, and tamping until the structure is completely recovered and backfilled.
The steel structure supporting device for the fully-recycled assembled rectangular pipe-jacking working well is formed by splicing a prefabricated ring beam, a prefabricated supporting structure, a prefabricated hole opening, a prefabricated back wall and a back cover;
the prefabricated supporting structure is formed by connecting H-shaped steel, profiled steel plates, corner columns and inner supports through bolts;
the prefabricated ring beam is of a reinforced concrete structure, and the top surface of the prefabricated ring beam is flush with the ground or slightly higher than the ground;
the prefabricated ring beam is provided with an embedded part a used for being connected with H-shaped steel of a prefabricated supporting structure;
the prefabricated ring beam is provided with an embedded part b used for being connected with a corner post of the prefabricated supporting structure;
the wing plates of the H-shaped steel are vertically arranged and used for fully utilizing the bending resistance of the H-shaped steel and improving the bearing capacity of the structure;
connecting pieces a are welded on the upper part and the lower part of the H-shaped steel at intervals, and the H-shaped steel is spliced and connected with the profiled steel sheet through the connecting pieces a;
welding a connecting piece b at one end of the H-shaped steel to realize transverse connection between the H-shaped steel;
reserving a circular connecting hole at the other end of the H-shaped steel to realize the connection between the H-shaped steel and the corner column;
reserving a circular connecting hole on the H-shaped steel wing plate to realize the connection between the H-shaped steel and the corner brace;
the left and right sides of the profiled steel sheet are welded with plane steel bars as connecting flanges, and transverse connection between profiled steel sheets is realized through bolts;
angle steel serving as a connecting flange is welded on the upper part and the lower part of the profiled steel sheet, and the profiled steel sheet is connected with the H-shaped steel through bolts;
the corner columns are square steel pipes and are arranged at four corners of the rectangular working well; the connecting piece c is welded on the outer wall of the square steel pipe, so that the connection between the square steel pipe and the H-shaped steel is realized; an inner sleeve is welded at one end of the square steel pipe, a pin bolt hole is reserved at the other end of the square steel pipe, a pin bolt hole matched with the pin bolt hole on the square steel pipe is reserved on the inner sleeve, and the connection between the upper square steel pipe and the lower square steel pipe is realized through a pin bolt;
the angle brace adopts I-shaped steel, and connecting plates are welded at two ends of the I-shaped steel and are used for being connected with the H-shaped steel through bolts;
the prefabricated hole comprises an inner hole structure and an outer hole structure; the left end and the right end of the outer opening structure are connected with the corner posts, the upper end of the outer opening structure is connected with a profiled steel sheet of the prefabricated supporting structure, and the lower end of the outer opening structure is connected with the bottom seal of the working well;
the outer opening structure is formed by welding H-shaped steel, an earth facing side baffle plate a, a rib plate a and an outer opening flange plate;
the inner hole structure is formed by welding H-shaped steel, an earth facing side baffle b and a rib plate b;
the inner opening structure is connected with the outer opening structure through bolts, so that a prefabricated opening is formed;
the outer hole flange is connected with a fixed water stop strip, so that slurry leakage is avoided when the push bench is pushed in;
filling light compression-resistant concrete between the ribbed slabs a and the ribbed slabs b in the prefabricated opening structure, and using the prefabricated rear back wall;
and the back cover adopts a mode of casting concrete in situ to carry out back cover construction of the working well.
The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well has the preferable scheme that the profiled steel plate is a corrugated steel plate formed by mechanically pressing a plane steel plate.
The steel structure supporting device for the fully-recycled assembled rectangular pipe-jacking working well has the preferred scheme that the flange plates of the inner and outer holes are formed by rolling steel plates, and the soil facing side baffle plate a, the soil facing side baffle plate b, the rib plates a and the rib plates b are all made of planar steel plates.
A steel construction supporting device for retrieving assembled rectangle push pipe working well entirely, its preferred scheme is when the entrance to a cave is great, and the interior entrance to a cave structure of integral type and outer entrance to a cave structure are when being difficult for the installation than heavy, can be in vertical to the inner and outer entrance to a cave structure merogenesis, and it is fixed through bolted connection between festival and the festival.
The steel structure supporting device for the fully-recycled assembled rectangular pipe-jacking working well has the advantages that the H-shaped steel can be replaced by other types of steel, and the profiled steel plate can also be replaced by other types of steel structures.
The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well has the preferred scheme that a rubber pad is filled between the inner hole and the outer hole.
Compared with the prior art, the invention has the beneficial effects that:
1) by adopting the construction method of layered excavation and follow-up supporting, the mechanical piling construction is not needed in advance, and the safety and stability of the working well can be effectively ensured.
2) The supporting structure is prefabricated in all factories and is fixedly connected through the high-strength bolts, the reliability of the supporting structure is high compared with that of a traditional cast-in-place concrete structure, maintenance is not needed, the construction time can be greatly saved, and the construction safety is effectively guaranteed.
3) Reasonable internal support form and support replacement operation can effectively ensure the engineering safety during the construction of the working well and the construction of the jacking pipe.
4) Prefabricated back wall, prefabricated entrance to a cave and prefabricated supporting construction integration construction avoid the later stage to open the portal and install the back wall construction, have practiced thrift the economic cost and the time cost of construction when guaranteeing safety.
5) The supporting structure is synchronously constructed by following filling and grouting, so that the disturbance to rock and soil mass is reduced, and the surface subsidence is reduced.
Drawings
FIG. 1 is a plan view of the structure of the present invention;
FIG. 2 is a schematic view of the structure A-A of FIG. 1;
FIG. 3 is a schematic view of the structure B-B of FIG. 1;
FIG. 4 is a schematic view of the structure C-C of FIG. 1;
FIG. 5 is a schematic view of the connection structure of the H-shaped steel with the connecting piece a and the connecting piece b;
FIG. 6 is a schematic view of the transverse connection between H-shaped steels;
FIG. 7 is a schematic view of the structure of a profiled steel sheet;
FIG. 8 is a schematic view showing the connection of a profiled steel sheet and an H-shaped steel sheet;
FIG. 9 is a schematic view of the transverse connections between profiled steel sheets;
FIG. 10 is a schematic view of a corner post and a connector c;
FIG. 11 is a schematic view of the upper and lower connection of corner posts;
FIG. 12 is a schematic view of the connection between the corner post and the H-shaped steel;
FIG. 13 is a plan view showing the connection of the H-beam and the gusset;
FIG. 14 is a schematic view of a prefabricated opening support structure;
FIG. 15 is a schematic view of D1-D1, D2-D2 in FIG. 14;
FIG. 16 is a construction flow chart;
FIG. 17 is a plane view of the head lifting of the pipe pushing jack after the support is removed.
In the figure: 1. prefabricated ring beam, 2, prefabricated supporting structure, 3, prefabricated hole opening, 4, prefabricated back wall, 5 back cover, 6, H-shaped steel, 7, profiled steel sheet, 8, corner post, 9, corner brace, 10, embedded part a, 11, embedded part b, 12, connecting piece a, 13, connecting piece b, 14, plane steel bar, 15, angle steel, 16, connecting piece c, 17, connecting plate, 18, inner hole opening structure, 19, outer hole opening structure, 20, soil facing side baffle a, 21, rib plate a, 22, outer hole opening flange plate, 23, soil facing side baffle b, 24, rib plate b, 25, splayed brace, 26, through long upright post, 27, diagonal brace, 28, first section, 29, second section, 30, first section first ring, 31, first section second ring, 32 and grouting.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
1. A construction method of a full-recovery assembled rectangular pipe-jacking working well,
1) construction prefabricated ring beam
Measuring and paying off in a construction site, and excavating a foundation trench to meet the requirement of prefabricated ring beam installation;
laying a cushion layer, placing the prefabricated ring beam 1 to the position of the foundation trench, and leveling, connecting and fixing;
2) excavation supporting first section 28
Excavating a first layer of earthwork;
the earth excavation depth is matched with the structural height of the assembled first ring 30;
four corner posts 8 and first ring H-shaped steel 6 are respectively spliced and connected with the prefabricated ring beam 1, the corner posts 8 are positioned at four corner positions of the rectangular working well, and the first ring H-shaped steel 6 is tightly attached to the bottom surface of the prefabricated ring beam 1;
fixedly connecting the joints of the H-shaped steel 6 and the corner columns 8 through bolts;
fixing a first ring-shaped profiled steel plate 6 and a second ring 31H-shaped steel 6 through bolts, wherein the first ring-shaped profiled steel plate is positioned below the first ring H-shaped steel;
installing a first-layer inner support, which comprises an angle support, a butt support and a splayed support, and fixing the first-layer inner support and the first ring H-shaped steel through bolts;
the earth excavation depth is matched with the structural height of the assembled first ring 30;
sequentially and alternately excavating earthwork, assembling corner posts 8, H-shaped steel 6, profiled steel plates 7, corner supports 9, butt supports 27 and splayed supports 25, and completing assembling connection and grouting construction until an excavation support reaches the top surface of a back wall (or a cave entrance);
3) excavation supporting second section 29
Excavating earthwork;
mounting corner posts 8 at four corners, assembling a prefabricated opening 3 structure at the opening side, assembling a prefabricated rear back wall 4 structure at the rear back wall side, assembling H-shaped steel 6 and profiled steel sheet 7 at the other two sides, fixedly connecting all structures with the intersection nodes of the corner posts 8 through bolts, and fixedly connecting all structures with the previous ring structure through bolts;
mounting an inner support, wherein the inner support comprises a corner support 9 and a counter support 27, and the inner support and the H-shaped steel 6 of the corresponding ring are fixed through bolts;
grouting 32 at the back of the supporting structure for filling construction;
sequentially and alternately excavating an earth assembling hole structure, a back wall structure, H-shaped steel 6, a profiled steel sheet 7, corner columns 8 and an inner support, and completing assembling connection and grouting 32 construction until an excavation support reaches the elevation of the bottom surface of a vertical shaft;
installing a longitudinal through long upright column, and fastening and connecting the longitudinal through long upright column with each ring of H-shaped steel 6 by using a high-strength bolt, wherein the bottom end of the through long upright column 26 needs to be deeper than the bottom surface of the vertical shaft;
4) back cover
Pouring the bottom sealing concrete in situ, and ensuring that the four-corner upright columns and the through long upright columns 26 are embedded in the bottom sealing concrete;
5) construction of support change
Dismantling the butt brace 27 and the splayed brace 25 to provide a pipe-jacking construction working surface;
6) pipe jacking construction
Jacking or receiving construction of the jacking pipe is carried out;
7) backfill recovery
And (4) dismantling the supporting structure layer by layer from the bottom of the well upwards, backfilling, and tamping until the structure is completely recovered and backfilled.
The steel structure supporting device is used for a fully-recycled assembled rectangular pipe-jacking working well and is formed by splicing a prefabricated ring beam 1, a prefabricated supporting structure 2, a prefabricated hole opening 3, a prefabricated back wall 4 and a back cover 5;
the prefabricated supporting structure 2 is formed by connecting H-shaped steel 6, profiled steel plates 7, angle braces 9, diagonal braces 27, splayed braces 25 and full-length upright posts 26 through bolts;
the prefabricated ring beam 1 is of a reinforced concrete structure, and the top surface of the prefabricated ring beam 1 is flush with the ground or slightly higher than the ground;
the prefabricated ring beam 1 is provided with an embedded part a10 used for being connected with the H-shaped steel 6 of the prefabricated supporting structure 2;
the prefabricated ring beam 1 is provided with an embedded part b11 used for being connected with a corner post 8 of the prefabricated supporting structure 2;
the wing plates of the H-shaped steel 6 are vertically arranged and used for fully utilizing the bending resistance of the H-shaped steel 6 and improving the bearing capacity of the structure;
connecting pieces a12 are welded on the upper part and the lower part of the H-shaped steel 6 at intervals, and the H-shaped steel 6 is spliced and connected with the profiled steel sheet 7 through the connecting pieces a 12;
welding a connecting piece b13 at one end of the H-shaped steel 6 to realize transverse connection between the H-shaped steel 6;
a circular connecting hole is reserved at the other end of the H-shaped steel 6 to realize the connection between the H-shaped steel 6 and the corner post 8;
reserving a circular connecting hole on the wing plate of the H-shaped steel 6 to realize the connection between the H-shaped steel 6 and the angle brace 9;
the left and right sides of the profiled steel sheet 7 are welded with plane steel bars 14 as connecting flanges, and transverse connection between the profiled steel sheets 7 is realized through bolts;
the upper part and the lower part of the profiled steel sheet 7 are welded with angle steels 15 as connecting flanges, and the profiled steel sheet 7 is connected with the H-shaped steel 6 through bolts;
the corner posts 8 are square steel pipes and are arranged at four corners of the rectangular working well; the connecting piece c16 is welded on the outer wall of the square steel pipe to realize the connection between the square steel pipe and the H-shaped steel 6; an inner sleeve is welded at one end of the square steel pipe, a pin bolt hole is reserved at the other end of the square steel pipe, a bolt eliminating hole matched with the bolt eliminating hole on the square steel pipe is reserved on the inner sleeve, and the connection between the upper square steel pipe and the lower square steel pipe is realized through a pin bolt;
the angle brace 9 is made of I-shaped steel, and connecting plates 17 are welded at two ends of the I-shaped steel and are used for being connected with the H-shaped steel 6 through bolts;
the prefabricated hole 3 consists of an inner hole structure 18 and an outer hole structure 19; the left end and the right end of the outer opening structure 19 are connected with the corner posts 8, the upper end of the outer opening structure is connected with the profiled steel sheet 7 of the prefabricated supporting structure 2, and the lower end of the outer opening structure is connected with the working well sealing bottom 5;
the outer cave mouth structure 19 is formed by welding H-shaped steel, an earth facing side baffle a20, a rib plate a21 and an outer cave mouth flange plate 22;
the inner hole structure 18 is formed by welding H-shaped steel, an earth facing side baffle b23 and a rib plate b 24;
the inner hole structure 18 is connected with the outer hole structure 19 through bolts, so that a prefabricated hole 3 is formed;
the flange plate 22 at the outer opening is connected with a fixed water stop strip, so that slurry leakage is avoided when the push bench is pushed in;
light compression-resistant concrete is filled between the ribbed slabs a21 and the ribbed slabs b24 in the prefabricated opening structure, and the prefabricated opening structure can be used as a prefabricated back wall 4;
and the back cover 5 is used for performing back cover construction of the working well in a mode of cast-in-place concrete.
The profiled steel sheet 7 is a steel sheet formed into a corrugated shape by mechanical pressing using a flat steel sheet.
The inner and outer hole flanges are formed by rolling steel plates, and the soil facing side baffle a20, the soil facing side baffle b23, the ribbed plate a21 and the ribbed plate b24 are all made of planar steel plates.
When the entrance to a cave is great, the interior entrance to a cave structure of integral type and outer entrance to a cave structure when heavier difficult installation, can divide the festival to the interior entrance to a cave structure of outer longitudinal direction, and it is fixed through bolted connection between festival and the festival.
The H-shaped steel 6 can be replaced by other types of steel, and the profiled steel sheet 7 can also be replaced by other types of steel structures.
A rubber pad is filled between the inner hole and the outer hole.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A construction method of a full-recovery assembled rectangular pipe-jacking working well is characterized by comprising the following steps:
1) construction prefabricated ring beam
Measuring and paying off in a construction site, and excavating a foundation trench to meet the requirement of prefabricated ring beam installation;
laying a cushion layer, placing the prefabricated ring beam to the position of the foundation trench, leveling, connecting and fixing;
2) excavation supporting first section
Excavating a first layer of earthwork;
the earth excavation depth is matched with the height of the assembled first ring structure;
four corner posts and first ring H-shaped steel are respectively spliced and connected with the prefabricated ring beam, the corner posts are positioned at four corner positions of the rectangular working well, and the first ring H-shaped steel is tightly attached to the bottom surface of the prefabricated ring beam;
fixedly connecting the H-shaped steel with the corner post node through a bolt;
fixing a first ring-shaped profiled steel plate and first ring-shaped H-shaped steel through bolts, wherein the first ring-shaped profiled steel plate is positioned below the first ring-shaped H-shaped steel;
installing a first-layer inner support, which comprises an angle support, a butt support and a splayed support, and fixing the first-layer inner support and the first ring H-shaped steel through bolts;
grouting and filling construction is carried out behind the first ring supporting structure;
sequentially and alternately excavating earthwork, assembling corner columns, H-shaped steel, profiled steel sheets and inner supports, and completing assembling connection and grouting construction until an excavation support reaches the top surface of a back wall (or a cave entrance);
3) second section of excavation support
Excavating earthwork;
mounting corner posts at four corners, assembling a prefabricated opening structure at the opening side, assembling a prefabricated back wall structure at the back wall side, assembling H-shaped steel and profiled steel plates at the other two sides, fixedly connecting all structures with the intersected nodes of the corner posts through bolts, and fixedly connecting all structures with the previous ring structure through bolts;
mounting an inner support, wherein the inner support comprises an angle support and a butt support, and the inner support and the H-shaped steel of the corresponding ring are fixed through bolts;
grouting and filling construction is carried out behind the supporting structure;
sequentially and alternately excavating an earth assembling hole structure, a back wall structure, H-shaped steel, profiled steel sheets, corner columns and inner supports, and completing assembling connection and grouting construction until an excavation support reaches the elevation of the bottom surface of a vertical shaft;
installing a longitudinal through long upright post, and tightly connecting the longitudinal through long upright post with each ring of H-shaped steel by using a high-strength bolt, wherein the bottom end of the through long upright post needs to be deeper than the bottom surface of the vertical shaft;
4) back cover
Pouring bottom sealing concrete in situ, and ensuring that the four-corner upright columns and the through long upright columns are embedded in the bottom sealing concrete;
5) construction of support change
Dismantling the butt brace and the splayed brace and providing a pipe jacking construction working surface;
6) pipe jacking construction
Jacking or receiving construction of the jacking pipe is carried out;
7) backfill recovery
And (4) dismantling the supporting structure layer by layer from the bottom of the well upwards, backfilling, and tamping until the structure is completely recovered and backfilled.
2. The steel structure supporting device for the full-recovery assembled rectangular pipe-jacking working well according to claim 1, wherein: the supporting device is formed by assembling a prefabricated ring beam, a prefabricated supporting structure, a prefabricated hole, a prefabricated back wall and a back cover;
the prefabricated supporting structure is formed by connecting H-shaped steel, profiled steel plates, corner columns and inner supports through bolts;
the prefabricated ring beam is of a reinforced concrete structure, and the top surface of the prefabricated ring beam is flush with the ground or slightly higher than the ground;
the prefabricated ring beam is provided with an embedded part a used for being connected with H-shaped steel of a prefabricated supporting structure;
the prefabricated ring beam is provided with an embedded part b used for being connected with a corner post of the prefabricated supporting structure;
the wing plates of the H-shaped steel are vertically arranged and used for fully utilizing the bending resistance of the H-shaped steel and improving the bearing capacity of the structure;
connecting pieces a are welded on the upper part and the lower part of the H-shaped steel at intervals, and the H-shaped steel is spliced and connected with the profiled steel sheet through the connecting pieces a;
welding a connecting piece b at one end of the H-shaped steel to realize transverse connection between the H-shaped steel;
reserving a circular connecting hole at the other end of the H-shaped steel to realize the connection between the H-shaped steel and the corner column;
reserving a circular connecting hole on the H-shaped steel wing plate to realize the connection between the H-shaped steel and the corner brace;
the left and right sides of the profiled steel sheet are welded with plane steel bars as connecting flanges, and transverse connection between profiled steel sheets is realized through bolts;
angle steel serving as a connecting flange is welded on the upper part and the lower part of the profiled steel sheet, and the profiled steel sheet is connected with the H-shaped steel through bolts;
the corner columns are square steel pipes and are arranged at four corners of the rectangular working well; the connecting piece c is welded on the outer wall of the square steel pipe, so that the connection between the square steel pipe and the H-shaped steel is realized; an inner sleeve is welded at one end of the square steel pipe, a pin bolt hole is reserved at the other end of the square steel pipe, a pin bolt hole matched with the pin bolt hole on the square steel pipe is reserved on the inner sleeve, and the connection between the upper square steel pipe and the lower square steel pipe is realized through a pin bolt;
the angle brace adopts I-shaped steel, and connecting plates are welded at two ends of the I-shaped steel and are used for being connected with the H-shaped steel through bolts;
the prefabricated hole comprises an inner hole structure and an outer hole structure; the left end and the right end of the outer opening structure are connected with the corner posts, the upper end of the outer opening structure is connected with a profiled steel sheet of the prefabricated supporting structure, and the lower end of the outer opening structure is connected with the bottom seal of the working well;
the outer opening structure is formed by welding H-shaped steel, an earth facing side baffle plate a, a rib plate a and an outer opening flange plate;
the inner hole structure is formed by welding H-shaped steel, an earth facing side baffle b and a rib plate b;
the inner opening structure is connected with the outer opening structure through bolts, so that a prefabricated opening is formed;
the outer hole flange is connected with a fixed water stop strip, so that slurry leakage is avoided when the push bench is pushed in;
filling light compression-resistant concrete between the ribbed slabs a and the ribbed slabs b in the prefabricated opening structure, and using the prefabricated rear back wall;
and the back cover adopts a mode of casting concrete in situ to carry out back cover construction of the working well.
3. The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well according to claim 2, characterized in that: the profiled steel sheet is a steel sheet with corrugations formed by mechanical pressing by adopting a plane steel sheet.
4. The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well according to claim 2, characterized in that: the inner and outer hole flange plates are formed by rolling steel plates, and the soil facing side baffle plate a, the soil facing side baffle plate b, the rib plate a and the rib plate b are all made of planar steel plates.
5. The steel structure supporting device for the full-recovery assembled rectangular pipe-jacking working well according to claim 2, wherein: a steel construction supporting device for retrieving assembled rectangle push pipe working well entirely, its preferred scheme is when the entrance to a cave is great, and the interior entrance to a cave structure of integral type and outer entrance to a cave structure are when being difficult for the installation than heavy, can be in vertical to the inner and outer entrance to a cave structure merogenesis, and it is fixed through bolted connection between festival and the festival.
6. The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well according to claim 2, characterized in that: the H-shaped steel can be replaced by other types of steel sections, and the profiled steel plate can also be replaced by other types of steel structures.
7. The steel structure supporting device for the fully-recovered assembled rectangular pipe-jacking working well according to claim 2, characterized in that: a rubber pad is filled between the inner hole and the outer hole.
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