CN112523227A - Steel pipe column for underground space structure and construction method - Google Patents
Steel pipe column for underground space structure and construction method Download PDFInfo
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- CN112523227A CN112523227A CN202011467068.2A CN202011467068A CN112523227A CN 112523227 A CN112523227 A CN 112523227A CN 202011467068 A CN202011467068 A CN 202011467068A CN 112523227 A CN112523227 A CN 112523227A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 251
- 239000010959 steel Substances 0.000 title claims abstract description 251
- 238000010276 construction Methods 0.000 title claims abstract description 47
- 230000002787 reinforcement Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 239000000725 suspension Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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Abstract
The invention provides a steel pipe column for an underground space structure and a construction method, wherein the steel pipe column is formed by connecting a plurality of steel pipes through flanges, and a steel pipe column bearing platform is arranged at the middle position of the steel pipe column and is used for installing a plurality of perpendicularity adjusting devices horizontally arranged along the circumference; the bottom of the steel pipe column is sleeved with a reinforcement cage, and the reinforcement cage is positioned on the periphery of the steel pipe column; the bottom of the steel pipe column is connected with the reinforcement cage through an adjustable connecting structure; the steel pipe column is provided with a plurality of shear-resistant studs arranged along the circumference array near the bottom. By adopting the scheme of combining the steel pipe column and the reinforcement cage, the whole hoisting weight of the steel pipe column is reduced, and the construction cost is reduced. Through being connected steel-pipe column and steel reinforcement cage with adjustable connection structure, make the regulation centering that can be automatic between steel-pipe column and the steel reinforcement cage, also be convenient for adjust the straightness that hangs down of steel-pipe column, improved the efficiency of construction. The bottom of the steel pipe column is provided with the shear-resistant stud, so that the binding force between the steel pipe column and the post-cast concrete can be reinforced.
Description
Technical Field
The invention relates to the field of underground building construction, in particular to a steel pipe column for an underground space structure and a construction method.
Background
And (3) underground space reverse construction, namely constructing a foundation pit supporting wall along the boundary line of the basement of the building or around the foundation pit, constructing steel pipe columns inside the foundation pit, constructing each floor of the basement as a transverse support, excavating earthwork downwards layer by layer and pouring each layer of underground structure until the bottom plate is sealed. The reverse construction method has the advantages of small deformation of the enclosure structure, small influence on adjacent buildings, small occupied construction space, construction time shortening, safe and civilized construction and the like. However, in the construction of the reverse method, when the length of the steel pipe column exceeds 50m and the verticality precision requirement reaches within one thousandth, the underground water in the pile hole is abundant, and if other unfavorable geological conditions are met, the construction difficulty is extremely high.
Chinese patent document CN104878775A describes a reversible steel pipe column verticality adjustment guide device of reverse construction method and a construction method thereof, which uses multi-segment steel pipes to manufacture a steel pipe column, and has the problems that the construction cost is too high, the self weight of the steel pipe column is large along with the increase of the depth, and the hoisting difficulty is greatly increased. CN110016914A describes a steel pipe column verticality correction device and a steel pipe column construction method by a reverse construction method, and the verticality is adjusted by a scheme of arranging a guide cylinder and a radial adjusting device at an orifice. CN 209368826U describes a verticality adjuster for steel pipe column in underground space development reverse construction method, which adjusts verticality by arranging cylinders or hydraulic cylinders arranged along circumference at a position more than 10 meters below the ground near the top of the steel pipe column. For solving the problem of steel-pipe column weight, the prior art has adopted the scheme of bottom steel reinforcement cage, top steel reinforcement column to reduce the dead weight, and be connected with 1 wire rope between the annular structure of steel-pipe column and steel reinforcement cage, and the central angle of wire rope between each tie point on annular stiffening rib board and steel reinforcement cage reinforcing ring board is the same. However, the length of the steel wire rope needs to be adjusted manually, and construction is troublesome. Because the steel pipe column and the steel reinforcement cage composite structure are difficult to pour at one time, the concrete between the early pouring section and the later pouring section has the problem of insufficient bonding strength.
Disclosure of Invention
The invention aims to provide a steel pipe column for an underground space structure and a construction method, which are convenient for adjusting the verticality of the steel pipe column, ensure the bonding strength between a first casting section and a second casting section of the steel pipe column and ensure the construction quality of the steel pipe column.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a steel pipe column for an underground space structure is formed by connecting a plurality of steel pipes through flanges, wherein a steel pipe column bearing platform is arranged in the middle of the steel pipe column and used for installing a plurality of verticality adjusting devices horizontally arranged along the circumference;
the bottom of the steel pipe column is sleeved with a reinforcement cage, and the reinforcement cage is positioned on the periphery of the steel pipe column;
the bottom of the steel pipe column is connected with the reinforcement cage through an adjustable connecting structure;
the steel pipe column is provided with a plurality of shear-resistant studs arranged along the circumference array near the bottom.
In the preferred scheme, the top of the steel pipe column is connected with the connecting column through a flange, the top of the connecting column is provided with a cross beam, buttresses are arranged around the orifice and are positioned below four ends of the cross beam, and a supporting jack is arranged between the buttresses and the cross beam.
In the preferred scheme, the steel pipe column bearing platform is a horizontally arranged annular plate, and the annular plate is connected with the outer wall of the steel pipe column in a welding manner;
and a plurality of steel pipe column limiting blocks are arranged on the steel pipe column bearing platform and used for limiting the verticality adjusting device, and the verticality adjusting device is an air cylinder, a hydraulic cylinder or a spiral telescopic mechanism.
In a preferred scheme, the structure of the spiral telescopic mechanism is as follows: the flexible motor sets up between each stopper, the output shaft and the pivot fixed connection of flexible motor, and the end of pivot has set firmly the external screw thread piece, and the outer sleeve cup joints with the pivot, and the inner wall of outer sleeve is equipped with the internal thread, and outer sleeve and external screw thread piece threaded connection still are equipped with the spout outside the inner wall of sleeve, and limiting slide sliding mounting is in the spout, limiting slide and flexible motor's casing fixed connection.
The tail of the telescopic motor is also connected with a recovery steel wire rope, and the periphery of the telescopic motor is provided with a pull automatic bouncing buckle for recovering the whole verticality adjusting device.
In a preferable scheme, a verticality detection device is further arranged on the steel pipe column, and the verticality detection device comprises one or more of a tilt angle sensor, a laser alidade and a plumb.
In the preferred scheme, the bottom of steel-pipe column is connected with the steel reinforcement cage through adjustable connection structure, and adjustable connection structure's structure is: the outer wall of the steel pipe column is provided with a steel pipe column connecting ring plate, the steel pipe column connecting ring plate is fixedly connected with the outer wall of the steel pipe column through a plurality of rib plates, and a steel bar connecting ring is arranged on the steel bar cage;
and the suspension steel wire ropes sequentially and alternately bypass the steel pipe column connecting ring plate and the steel bar connecting ring to flexibly connect the steel pipe column and the steel bar cage together.
In the preferred scheme, the outer wall of the shear-resistant stud is coated with a sponge coating layer, and the outer wall of the sponge coating layer is coated with a waterproof coating layer.
The construction method for the steel pipe column for the underground space structure comprises the following steps:
s1, forming holes;
s2, manufacturing an orifice positioning frame;
s3, hoisting and lowering the reinforcement cage;
s4, temporarily fixing the reinforcement cage on the orifice positioning frame by using the carrying pole beam;
s5, hoisting the steel pipe column;
s6, hoisting the steel pipe column into a reinforcement cage for sleeving, and connecting the steel pipe column and the reinforcement cage together through a hanging steel wire rope by using an adjustable connection structure;
s7, taking out the shoulder pole beam, integrally lowering the steel pipe column and the steel reinforcement cage, mounting the verticality adjusting device on a steel pipe column bearing platform of the steel pipe column in the lowering process, and then continuing to lower;
s8, fixing the steel pipe column on the orifice positioning frame through the pipe holding device, installing a verticality detection device, and adjusting the verticality of the steel pipe column through detection data of the verticality detection device by using a verticality adjusting device;
s9, fixing the steel pipe column on the orifice positioning frame through the connecting column and the cross beam, and arranging a buttress and a supporting jack below the end head of the cross beam;
s10, integrally lowering the steel pipe column and the reinforcement cage in place;
s11, installing a pouring platform and a guide pipe;
s12, pouring from the bottom, and continuously lifting the bottom of the guide pipe in the pouring process to ensure that the bottom of the guide pipe is positioned in the concrete;
s13, over-pouring concrete to the upper part of the outer wall of the steel pipe column, which is provided with the shear-resistant stud section, continuously pouring the inner cavity of the steel pipe column, and filling crushed stone and grouting outside the steel pipe column;
s14, after the pouring is finished, downward excavation is carried out, the super-poured concrete of the shear resistant stud section on the outer wall of the steel pipe column is chiseled, and the structural concrete is poured again;
through the steps, the construction of the steel pipe column for the underground space structure is realized.
In the preferred scheme, for terrains with poor geological conditions, a two-stage pore-forming method is adopted;
the upper section adopts a full-rotation drilling machine and a steel casing protecting wall, and the lower section adopts a rotary drilling machine and a slurry protecting wall.
In the preferred scheme, before construction, a sponge coating layer and a waterproof coating layer are used for coating the shear-resistant stud from inside to outside;
when the super-poured concrete is chiseled off, the sponge coating layer and the waterproof coating layer are removed.
According to the steel pipe column for the underground space structure and the construction method, the scheme that the steel pipe column is combined with the reinforcement cage is adopted, so that the overall hoisting weight of the steel pipe column is reduced, and the construction cost is reduced. Through being connected steel-pipe column and steel reinforcement cage with adjustable connection structure, make the regulation centering that can be automatic between steel-pipe column and the steel reinforcement cage, also be convenient for adjust the straightness that hangs down of steel-pipe column, improved the efficiency of construction. The bottom of the steel pipe column is provided with the shear-resistant stud, so that the binding force between the steel pipe column and the post-cast concrete can be reinforced. The perpendicularity adjusting device can conveniently adjust the perpendicularity of the steel pipe column in the hoisting process. In the construction method, the upper section adopts a full-rotation drilling machine and a steel casing retaining wall, and the lower section adopts a rotary drilling machine and a slurry retaining wall, so that the construction quality is ensured, the construction efficiency is improved, the construction safety is ensured, and the construction quality is ensured. Cover sponge coating and waterproof coating at the surface of shear bolt, can be convenient for chisel out super-filled concrete, effectively ensure to be chiseled out before the secondary is pour, ensure once and the quality of secondary pouring.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a top view of the adjustable connection of the present invention.
Fig. 3 is a partially enlarged schematic view of the verticality adjusting device of the present invention.
Fig. 4 is a schematic structural view of the inventive shear pin.
FIG. 5 is a flow chart of the construction method of the present invention.
In the figure: the steel pipe column comprises a steel pipe column 1, a steel pipe column connection ring plate 101, a connecting rib 102, a steel pipe column bearing platform 103, a steel pipe column limiting block 104, a shear-resistant stud 105, a sponge coating layer 106, a waterproof coating layer 107, a steel reinforcement cage 2, a steel reinforcement connecting ring 21, an adjustable connecting structure 3, a suspension steel wire rope 31, a connecting column 4, a cross beam 5, a supporting jack 6, a verticality adjusting device 7, a recovery steel wire rope 71, a telescopic motor 72, a rotating shaft 73, a sliding groove 74, a limiting slide block 75, an external thread block 76, an outer sleeve 77, a steel casing 8, a buttress 9 and an orifice positioning frame 10.
Detailed Description
Example 1:
as shown in fig. 1, a steel pipe column for an underground space structure, the steel pipe column 1 is formed by connecting a plurality of steel pipes through flanges, and a steel pipe column bearing platform 103 is arranged at the middle position of the steel pipe column 1 and used for installing a plurality of perpendicularity adjusting devices 7 horizontally arranged along the circumference; preferably, the perpendicularity adjusting means 7 are arranged in 4 along the circumference.
The bottom of the steel pipe column 1 is sleeved with a reinforcement cage 2, and the reinforcement cage 2 is positioned on the periphery of the steel pipe column 1; the structure can reduce the overall hoisting weight, and the depth of the hole reaches 87 meters. The aperture is 2.5 meters, if adopt the structure of all-steel tubular column 1, construction cost is high, and the dead weight is heavier, and the construction degree of difficulty promotes by a wide margin. In the invention, the part below the bottom surface of the underground space structure adopts the structure of a reinforcement cage 2, and the part above the bottom surface adopts the structure of a steel pipe column 1. By the structure, the construction efficiency is improved, and the construction cost is reduced.
The bottom of the steel pipe column 1 is connected with a reinforcement cage 2 through an adjustable connecting structure 3; from this structure, be convenient for adjust the centering of bottom and steel reinforcement cage 2 of steel-pipe column 1 in the transfer process.
The steel pipe column 1 is provided with a plurality of shear studs 105 arranged in a circumferential array near the bottom. Therefore, the structure is convenient for improving the binding force with concrete. In subsequent construction, a steel reinforcement cage needs to be sleeved on the outer wall of the steel pipe column 1, and the stand column needs to be poured, so that the arranged shear studs 105 can ensure that the post-poured concrete is tightly combined with the steel pipe column 1.
In a preferred scheme, as shown in fig. 1, the top of a steel pipe column 1 is connected with a connecting column 4 through a flange, a cross beam 5 is arranged at the top of the connecting column 4, buttresses 9 are arranged around an orifice, the buttresses 9 are positioned below four ends of the cross beam 5, and a supporting jack 6 is arranged between the buttresses 9 and the cross beam 5. The middle part of the cross beam 5 is provided with a hole for the convenient insertion of a pouring conduit. Preferably, the support jack 6 is a screw jack. In the subsequent construction process of adjusting the verticality, the deformation of the steel pipe column 1 is compensated by adjusting the telescopic height of the supporting jack 6.
Preferably, as shown in fig. 1 and 3, the steel pipe column bearing platform 103 is a horizontally arranged annular plate, the annular plate is connected with the outer wall of the steel pipe column 1 in a welding manner, and the bottom of the annular plate is connected with the outer wall of the steel pipe column 1 in a welding manner through a plurality of reinforcing ribs;
the steel pipe column bearing platform 103 is provided with a plurality of steel pipe column limiting blocks 104, the steel pipe column limiting blocks 104 are used for limiting the front, back, left and right movement of the telescopic motor 72, but do not limit the space at the top of the telescopic motor 72 so as to be taken out after the verticality adjusting operation is finished, and the verticality adjusting device 7 is an air cylinder, a hydraulic cylinder or a spiral telescopic mechanism.
The preferable scheme is as shown in fig. 3, the structure of the spiral telescopic mechanism is as follows: the telescopic motor 72 is arranged among the limit blocks 104, an output shaft of the telescopic motor 72 is fixedly connected with the rotating shaft 73, an external thread block 76 is fixedly arranged at the end of the rotating shaft 73, the outer sleeve 77 is sleeved with the rotating shaft 73, an internal thread is arranged on the inner wall of the outer sleeve 77, the outer sleeve 77 is in threaded connection with the external thread block 76, a sliding groove 74 is further arranged on the inner wall of the outer sleeve 77, the limit sliding block 75 is slidably arranged in the sliding groove 74, and the limit sliding block 75 is fixedly connected with a shell of the telescopic motor 72. Adopt cylinder or pneumatic cylinder difference among the prior art, adopt flexible motor 72 as the driving source in this application, from this structure, can the accurate control outer sleeve 77 stretch out distance to do benefit to the straightness that hangs down of accurate regulation steel-pipe column 1. Further preferably, the structure of the outer sleeve 77 and the rotating shaft 73 further reduces the space structure occupation of the verticality adjusting device 7, and facilitates the arrangement of the verticality adjusting device 7 in the narrow space between the steel casing 8 and the steel pipe column 1. And the simplified structure is more compact.
The tail part of the telescopic motor 72 is also connected with a recovery steel wire rope 71 and used for recovering the whole verticality adjusting device 7. With this structure, it is convenient to retrieve the wire rope 71 by pulling, and take out the entire verticality adjusting device 7.
In the preferable scheme, a verticality detection device is further arranged on the steel pipe column 1, and the verticality detection device comprises one or more of a tilt angle sensor, a laser alidade and a plumb. In this example, a combination of three ways is used, in which the tilt sensor is used for coarse adjustment, and the laser alidade and plumb are used to accurately verify the perpendicularity of the steel pipe column 1. Preferably, the weight is vertically arranged on the cross beam 5 and used for adjusting the verticality of the steel pipe column 1; the laser head of the laser alidade is arranged in the middle of the cross beam 5, and the target is arranged at the position close to the middle of the steel pipe column 1 or the position without accumulated water at the bottom. The flexural deformation of the steel pipe column 1 was detected by a laser collimator. And then compensated for by the telescopic height of the supporting jack 6.
The preferred scheme is as in fig. 1, 2, the bottom of steel-pipe column 1 is connected with steel reinforcement cage 2 through adjustable connection structure 3, and adjustable connection structure 3's structure is: the outer wall of the steel pipe column 1 is provided with a steel pipe column connecting ring plate 101, the steel pipe column connecting ring plate 101 is fixedly connected with the outer wall of the steel pipe column 1 through a plurality of connecting ribs 102, and a steel bar connecting ring 21 is arranged on the steel bar cage 2;
the suspension steel wire rope 31 sequentially bypasses the steel pipe column connecting ring plate 101 and the steel bar connecting ring 21 in a staggered manner, and flexibly connects the steel pipe column 1 and the steel bar cage 2 together. With the structure, the suspension steel wire rope 31 is connected with the steel pipe column connecting ring plate 101 and the steel bar connecting ring 21 in a sliding suspension mode, so that the centering position between the steel pipe column 1 and the steel bar cage 2 can be conveniently adjusted. Preferably, round pipes are welded at the positions where the steel pipe column connecting ring plate 101 and the steel bar connecting ring 21 contact with the suspension steel wire rope 31 and coated with lubricating oil, and the suspension steel wire rope 31 bypasses the round pipes so as to reduce the deformation of the suspension steel wire rope 31 and avoid the fracture.
In a preferred scheme, the outer wall of the shear pin 105 is coated with a sponge coating layer 106, and the outer wall of the sponge coating layer 106 is coated with a waterproof coating layer 107. With the structure, the concrete and the shear pin 105 can be conveniently separated when the concrete is chiseled off in the later period.
Example 2:
as shown in fig. 5, a construction method of a steel pipe column for an underground space structure using the method of claim, comprising the steps of:
s1, forming holes;
in the preferred scheme, for terrains with poor geological conditions, a two-stage pore-forming method is adopted;
the upper section of the hole adopts a full-slewing drilling machine and a steel protective cylinder 8 protective wall, and the lower section adopts a rotary drilling machine and a mud protective wall. This scheme can furthest improve the pore-forming success rate, avoids appearing the hole collapse accident. In a further preferred scheme, the lower section corresponds to the length of the reinforcement cage 2, and the rest part is positioned at the upper section.
S2, manufacturing an orifice positioning frame 10; when the orifice positioning frame 10 is constructed, firstly, the orifice is excavated downwards, then a concrete foundation is poured, the diameter of the orifice is increased by 2m, the thickness of the concrete foundation is 0.3-0.4 m, the concrete is marked as C30, double-layer bidirectional steel bars with the diameter of 14mm are internally matched, and the orifice positioning frame 10 is constructed on the concrete foundation.
S3, after the steel reinforcement cage 2 is qualified, hoisting the steel reinforcement cage 2 in a double-machine hoisting mode, and putting the steel reinforcement cage into the hole along the steel casing 8;
s4, temporarily fixing the reinforcement cage 2 on the orifice positioning frame 10 by a carrying pole beam;
s5, hoisting the steel pipe column 1;
s6, hoisting the steel pipe column 1 into the reinforcement cage 2 for sleeving, and connecting the steel pipe column 1 and the reinforcement cage 2 together through the hanging steel wire rope 31 by the adjustable connecting structure 3; the hanging steel wire ropes 31 sequentially and alternately bypass the steel pipe column connecting ring plate 101 and the steel bar connecting ring 21, the steel pipe column 1 and the steel bar cage 2 are flexibly connected together, and the relative front, back, left and right positions can be conveniently adjusted. In a preferred scheme, the adjustable connecting structures 3 are arranged in a plurality of groups from top to bottom. Preferably two groups.
S7, taking out the shoulder pole beam, integrally lowering the steel pipe column 1 and the steel reinforcement cage 2, mounting the verticality adjusting device 7 on the steel pipe column bearing platform 103 of the steel pipe column 1 in the lowering process, and then continuing to lower;
s8, fixing the steel pipe column 1 on the orifice positioning frame 10 through a pipe holding device, installing a verticality detection device, and adjusting the verticality of the steel pipe column 1 through detection data of the verticality detection device and a verticality adjusting device 7; according to the detection of the inclination angle sensor, the rotation angle of the telescopic motor 72 in the corresponding direction is adjusted, so that the outer sleeve 77 is stretched by a preset distance, and the perpendicularity of the steel pipe column 1 is approximately adjusted.
S9, fixing the steel pipe column 1 on the orifice positioning frame 10 through the connecting column 4 and the cross beam 5, and arranging a buttress 9 and a supporting jack 6 below the end of the cross beam 5; and (3) installing a heavy plumb on the cross beam 5, and further accurately adjusting the verticality of the steel pipe column 1 according to the dip angle of the heavy plumb. And after the adjustment is finished, observing the laser collimator, detecting the deformation of the steel pipe column 1, calculating, adjusting the supporting jack 6, and compensating the deformation of the steel pipe column 1.
S10, integrally lowering the steel pipe column 1 and the reinforcement cage 2 in place;
s11, installing a pouring platform and a guide pipe;
s12, pouring from the bottom of the hole, and continuously lifting the bottom of the guide pipe in the pouring process to ensure that the bottom of the guide pipe is positioned in the concrete;
s13, over-pouring concrete above one section of the shear-resistant stud 105 on the outer wall of the steel pipe column 1, continuously pouring in the inner cavity of the steel pipe column 1, and filling crushed stone and grouting outside the steel pipe column 1;
s14, after the pouring is finished, downward excavation is carried out, structures of all layers of the underground building are constructed, bottom plates of all layers are used as transverse connection structures among all the steel pipe columns 1, and in order to ensure the bonding strength of new and old concrete, when steel reinforcement cages and concrete columns on the periphery of the steel pipe columns 1 are continuously poured, peripheral concrete on one section of the shear resistant studs 105 on the outer walls of the steel pipe columns 1 is chiseled;
in the process of backfilling the concrete pouring broken stones of the steel pipe column test pile, because the distance between the 2.2m outer diameter ring plate at the bottom plate and the hole wall is only 150mm, the broken stones cannot completely penetrate through the ring plate and press the concrete, a cavity with the height of about 2.38m is formed between the bottom of the ring plate and the concrete pouring pile face, and therefore the concrete pouring height of the pile face is lifted to the bottom of the 2.2m outer diameter ring plate. After later construction excavation, the concrete on the pile surface which is excessively irrigated needs to be chiseled. In order to prevent the studs outside the steel pipe columns connected with the concrete from being solidified in advance during the process of chiseling the concrete, the shear studs 105 at the position of the super-grouting height are treated by the following measures: firstly, using a foamed sponge plate to completely wrap the shear-resistant studs on the outer side of the steel pipe column, filling the pores of the upper part and the lower part of the shear-resistant studs and the connecting part of the steel pipe column with a polyurethane foaming agent, then using plastic envelopes to tightly wind the sponge plate on the outer side of the sponge plate, and using iron wires to bind and seal the sponge plate. In the concrete pouring process, concrete pouring can not influence the completely-coated and sealed shear-resistant stud. Meanwhile, the shear-resistant stud on the outer side of the steel pipe column can be well protected in the later-stage concrete-over-pouring-removing process.
In the preferred scheme, before construction, a sponge coating layer 106 and a waterproof coating layer 107 coat the shear-resistant studs 105 from inside to outside;
when the super-filled concrete is chiseled off, both the sponge coating 106 and the waterproof coating 107 are removed.
Through the steps, the construction of the steel pipe column for the underground space structure is realized.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. A steel-pipe column for underground space structure, characterized by: the steel pipe column (1) is formed by connecting a plurality of steel pipes through flanges, a steel pipe column bearing platform (103) is arranged in the middle of the steel pipe column (1) and used for installing a plurality of verticality adjusting devices (7) horizontally arranged along the circumference;
the bottom of the steel pipe column (1) is sleeved with a reinforcement cage (2), and the reinforcement cage (2) is positioned on the periphery of the steel pipe column (1);
the bottom of the steel pipe column (1) is connected with the reinforcement cage (2) through an adjustable connecting structure (3);
the steel pipe column (1) is provided with a plurality of shear resistant studs (105) arranged along the circumference array near the bottom.
2. The steel pipe column for an underground space structure according to claim 1, wherein: the top of the steel pipe column (1) is connected with the connecting column (4) through a flange, the top of the connecting column (4) is provided with a cross beam (5), buttresses (9) are arranged around the orifices, the buttresses (9) are positioned below four ends of the cross beam (5), and a supporting jack (6) is arranged between the buttresses (9) and the cross beam (5).
3. The steel pipe column for an underground space structure according to claim 1, wherein: the steel pipe column bearing platform (103) is a horizontally arranged annular plate, and the annular plate is welded and connected with the outer wall of the steel pipe column (1);
the steel pipe column bearing platform (103) is provided with a plurality of steel pipe column limiting blocks (104) for limiting a verticality adjusting device (7), and the verticality adjusting device (7) is a cylinder, a hydraulic cylinder or a spiral telescopic mechanism.
4. A steel pipe column for an underground space structure according to claim 3, wherein: the structure of the spiral telescopic mechanism is as follows: the telescopic motor (72) is arranged among the limit blocks (104), the output shaft of the telescopic motor (72) is fixedly connected with the rotating shaft (73), the end of the rotating shaft (73) is fixedly provided with an external thread block (76), the outer sleeve (77) is sleeved with the rotating shaft (73), the inner wall of the outer sleeve (77) is provided with internal threads, the outer sleeve (77) is in threaded connection with the external thread block (76), the inner wall of the outer sleeve (77) is also provided with a sliding groove (74), the limit slider (75) is slidably arranged in the sliding groove (74), the limit slider (75) is fixedly connected with the shell of the telescopic motor (72),
the tail part of the telescopic motor (72) is also connected with a recovery steel wire rope (71), and the periphery of the telescopic motor (72) is provided with a pull-off automatic spring buckle for recovering the whole verticality adjusting device (7).
5. A steel pipe column for an underground space structure according to claim 3, wherein: the steel pipe column (1) is also provided with a verticality detection device, and the verticality detection device comprises one or more of a tilt angle sensor, a laser alidade and a heavy plumb.
6. The steel pipe column for an underground space structure according to claim 1, wherein: the bottom of steel-pipe column (1) is connected with steel reinforcement cage (2) through adjustable connection structure (3), and the structure of adjustable connection structure (3) is: the outer wall of the steel pipe column (1) is provided with a steel pipe column connecting ring plate (101), the steel pipe column connecting ring plate (101) is fixedly connected with the outer wall of the steel pipe column (1) through a plurality of rib plates (102), and a steel bar connecting ring (21) is arranged on the steel bar cage (2);
the suspension steel wire ropes (31) sequentially and alternately bypass the steel pipe column connecting ring plate (101) and the steel bar connecting ring (21), and the steel pipe column (1) and the steel bar cage (2) are flexibly connected together.
7. The steel pipe column for an underground space structure according to claim 1, wherein: the outer wall of the shear-resistant stud (105) is coated with a sponge coating layer (106), and the outer wall of the sponge coating layer (106) is coated with a waterproof coating layer (107).
8. A construction method of a steel pipe column for an underground space structure using any one of claims 1 to 7, comprising the steps of:
s1, forming holes;
s2, manufacturing an orifice positioning frame (10);
s3, hoisting and lowering the reinforcement cage (2);
s4, temporarily fixing the reinforcement cage (2) on the orifice positioning frame (10) by a carrying pole beam;
s5, hoisting the steel pipe column (1);
s6, hoisting the steel pipe column (1) into the reinforcement cage (2) for sleeving, and connecting the steel pipe column (1) and the reinforcement cage (2) together through a suspension steel wire rope (31) by using an adjustable connecting structure (3);
s7, taking out the shoulder pole beam, integrally lowering the steel pipe column (1) and the reinforcement cage (2), installing the verticality adjusting device (7) on the steel pipe column bearing platform (103) of the steel pipe column (1) in the lowering process, and then continuing to lower;
s8, fixing the steel pipe column (1) on the orifice positioning frame (10) through the pipe holding device, installing a verticality detection device, and adjusting the verticality of the steel pipe column (1) through detection data of the verticality detection device by using a verticality adjusting device (7);
s9, fixing the steel pipe column (1) on the orifice positioning frame (10) through the connecting column (4) and the cross beam (5), and arranging a buttress (9) and a supporting jack (6) below the end of the cross beam (5);
s10, integrally lowering the steel pipe column (1) and the reinforcement cage (2) to a proper position;
s11, installing a pouring platform and a guide pipe;
s12, pouring from the bottom, and continuously lifting the bottom of the guide pipe in the pouring process to ensure that the bottom of the guide pipe is positioned in the concrete;
s13, over-pouring concrete to the upper part of the section, provided with the shear-resistant studs (105), of the outer wall of the steel pipe column (1), continuously pouring the inner cavity of the steel pipe column (1), and filling crushed stone grouting outside the steel pipe column (1);
s14, after the pouring is finished, downward excavation is carried out, a section of super-poured concrete of the shear resistant stud (105) on the outer wall of the steel pipe column (1) is chiseled off, and structural concrete is poured again;
through the steps, the construction of the steel pipe column for the underground space structure is realized.
9. The method of constructing a steel pipe column for an underground spatial structure according to claim 8, wherein: for terrains with poor geological conditions, a two-stage pore-forming method is adopted;
the upper section adopts a full-rotation drilling machine and a steel protective cylinder (8) to protect the wall, and the lower section adopts a rotary drilling machine and a mud protective wall.
10. The method of constructing a steel pipe column for an underground spatial structure according to claim 8, wherein: before construction, a sponge coating layer (106) and a waterproof coating layer (107) coat the shear-resistant stud (105) from inside to outside;
when the super-poured concrete is chiseled off, the sponge coating (106) and the waterproof coating (107) are removed.
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| CN202011467068.2A CN112523227A (en) | 2020-12-14 | 2020-12-14 | Steel pipe column for underground space structure and construction method |
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