CN110872843B - Construction method for controlling verticality of foundation pit section steel lattice column - Google Patents
Construction method for controlling verticality of foundation pit section steel lattice column Download PDFInfo
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- CN110872843B CN110872843B CN201911206066.5A CN201911206066A CN110872843B CN 110872843 B CN110872843 B CN 110872843B CN 201911206066 A CN201911206066 A CN 201911206066A CN 110872843 B CN110872843 B CN 110872843B
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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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Abstract
The invention relates to the technical field of verticality control of a profile steel lattice column, and discloses a construction method for verticality control of a foundation pit profile steel lattice column, which comprises the following construction steps: reserving hoisting holes in the manufacturing process of the section steel lattice column; lifting the section steel lattice column to the position above the pile hole, erecting two theodolites for measuring the section steel lattice column, wherein the two theodolites are positioned in different directions, and the three foot sides can be observed at a visual angle as the standard; welding a reinforcement cage; after the section steel lattice column is welded, slowly lowering the section steel lattice column to remeasure the position of the section steel lattice column to be in the verticality in the process of section steel elevation, then inserting a cross bar into a reserved hoisting hole, leveling and fixing, and welding a hoisting rib; carrying out plane position positioning on the section steel lattice column; the section steel lattice column is positioned from different positions through the two theodolites, and is vertically arranged under the support of the hanging ribs under the action of gravity, so that the perpendicularity of the section steel lattice column in the filling process is guaranteed, and the section steel lattice column reaches higher perpendicularity.
Description
Technical Field
The invention relates to the technical field of section steel lattice columns, in particular to a construction method for controlling the verticality of a foundation pit section steel lattice column.
Background
The section steel lattice column is a lattice column for short, the section is generally designed into a biaxial symmetry or uniaxial symmetry section by section steel or a steel plate, and the section steel lattice column has wide application in the construction process.
In the prior art, in the construction process, lattice columns are used as bending members and are mostly used for factory building frame columns and independent columns, the sections are generally formed by section steel or steel plates and are designed into biaxial symmetrical or uniaxial symmetrical sections, the lattice system members are composed of limb parts and lacing materials, the limb parts mainly bear axial force, the lacing materials mainly resist lateral force (relative to the axial direction of the limb), the lattice column lacing materials mainly comprise lacing bars and lacing plates, and the lattice columns are structurally characterized in that the material areas are arranged far away from the inertia axis, so that the bending resistance of the members can be enhanced under the condition of the same axial resistance, and materials are saved.
However, the requirement for the verticality deviation of the lattice column is high during construction, detection is needed at any time during the construction process, and however, in the construction process of the lattice column in the prior art, the problem that the verticality deviation of the lattice column cannot be controlled to meet the construction requirement exists, and the construction quality is further affected.
Disclosure of Invention
The invention aims to provide a construction method for controlling the verticality of a foundation pit section steel lattice column, and aims to solve the problem that the verticality deviation of the lattice column cannot be controlled to meet the construction requirement in the prior art.
The invention discloses a construction method for controlling the verticality of a foundation pit type steel lattice column, which comprises the following construction steps:
1) prefabricating the section steel lattice column, and reserving a hoisting hole in the manufacturing process of the section steel lattice column;
2) hoisting the section steel lattice column to the position above the pile hole, erecting two theodolites for measuring the section steel lattice column at the moment, wherein the two theodolites are located in different directions, and the three leg edges can be observed at the visual angle;
3) welding a reinforcement cage;
4) after the section steel lattice column is welded, slowly lowering the section steel lattice column to the section steel elevation process, remeasuring the section steel lattice column position in the verticality, then inserting the cross bar into the reserved hoisting hole, flatly placing and fixing, and welding the hanging rib;
5) carrying out plane position positioning on the section steel lattice column;
6) and pouring concrete.
Further, in step 2), two said theodolites are arranged at 90 ° to each other with respect to the section steel lattice column.
Further, in step 4), a first coordinate point and a second coordinate point are arranged on two sides of the section steel lattice column, and the first coordinate point and the second coordinate point are directly pulled, and the axis position of the section steel lattice column is adjusted through the pulling wire.
Further, in step 6), after the downward placement of the section steel lattice column is completed, a cross bar penetrates through the hanging ribs for fixation, the cross bar is placed on the bolster to prevent sinking, and the section steel lattice column is prevented from shifting when concrete is poured at last.
Furthermore, the section steel lattice column comprises a plurality of angle steels, a plurality of supporting beams and a hoisting piece; the hoisting piece and the section steel lattice column are fixedly arranged, and the hoisting piece is used for hoisting the section steel lattice column by a hoisting machine; the hoist and mount piece include the strengthening rib and hang the muscle, the strengthening rib with shaped steel lattice column is fixed to be arranged, the strengthening rib orientation the upper end of shaped steel lattice column extends, and crosses shaped steel lattice column is vacant and arranges and form the extension section, it passes through welded fastening to hang the muscle on the extension section of strengthening rib.
Furthermore, the reinforcing ribs are fixedly arranged on the angle steels, and one reinforcing rib is fixedly arranged on the inner side wall of each angle steel.
Furthermore, a plurality of the hanging ribs are vertically arranged in an annular shape at the same height.
Further, the plurality of suspension ribs are arranged toward the same direction.
Furthermore, the upper end of the section steel lattice column is provided with two hoisting holes, and the two hoisting holes are positioned at the same horizontal height.
Further, the shaped steel lattice column is arranged in a cuboid shape, and the two hoisting holes are formed in the tops of the two angle steels arranged in a diagonal line respectively.
Compared with the prior art, the construction method for controlling the verticality of the foundation pit steel lattice column comprises the steps of presetting the steel lattice column with the hoisting hole, respectively measuring the verticality of the steel lattice column from two different directions by using two theodolites when the steel lattice column is lowered, remeasuring the position of the steel lattice column in the verticality in the subsequent lowering process, then inserting the cross bar into the reserved hoisting hole to be horizontally placed and fixed, welding the hanging rib, inserting the cross bar into the hanging rib at the moment to perform plane position positioning, then performing pouring, performing verticality control on the steel lattice column through multiple paths and multiple directions to ensure the verticality of the steel lattice column in the lowering process, and in the final pouring process, the steel lattice column is vertically arranged under the support of the hanging rib under the action of gravity, and further ensuring the verticality of the steel lattice column in the pouring process, thereby make shaped steel lattice column reach higher straightness that hangs down.
Drawings
FIG. 1 is a flow chart of construction steps of a construction method for controlling the verticality of a foundation pit type steel lattice column provided by the invention;
FIG. 2 is a schematic perspective view of the verticality measurement control of the construction method for controlling the verticality of the lattice column of the foundation pit steel provided by the present invention;
FIG. 3 is a schematic perspective view of the plane orientation in the construction method for controlling the verticality of the lattice column of foundation pit steel according to the present invention;
FIG. 4 is a perspective view of the welding of the hanging bars at the top of the profile steel lattice column for the construction method for controlling the verticality of the profile steel lattice column of the foundation pit according to the present invention;
FIG. 5 is a schematic plan view of the section steel lattice column of the construction method for controlling the verticality of the section steel lattice column of the foundation pit according to the present invention;
fig. 6 is an enlarged schematic top view of the section steel lattice column in the construction method for controlling the verticality of the foundation pit section steel lattice column according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1 to 6, preferred embodiments of the present invention are shown.
The construction method for controlling the verticality of the foundation pit section steel lattice column comprises the following construction steps:
1) prefabricating the section steel lattice column 10, and reserving a hoisting hole 201 in the manufacturing process of the section steel lattice column 10;
2) the lifting type steel lattice column 10 is arranged above the pile hole 180, two theodolites 90 for measuring the type steel lattice column 10 are erected on the ground 70 at the moment, the two theodolites 90 are located in different directions, and the visual angle is based on the fact that three foot sides can be observed;
3) welding a reinforcement cage;
4) after the section steel lattice column 10 is welded, slowly lowering the section steel lattice column 10 until the section steel lattice column 10 is remeasured in the elevation process of the section steel, and then inserting the cross bar 60 into the reserved hoisting hole 201 to be horizontally placed and fixed, and welding the hoisting rib 100;
5) positioning the plane position of the section steel lattice column 10;
6) and pouring concrete.
The construction method for controlling the verticality of the foundation pit steel lattice column 10 comprises the steps of presetting the steel lattice column 10 with the hoisting holes 201, respectively measuring the verticality of the steel lattice column 10 from two different directions by using two theodolites 90 when the steel lattice column 10 is placed downwards, remeasuring the position of the steel lattice column 10 in the verticality in the subsequent placing process, then inserting the cross bar 60 into the reserved hoisting holes 201 to be horizontally fixed, welding the hanging ribs 100, then inserting the cross bar 60 into the hanging ribs 100 to perform plane position positioning, then performing pouring, performing verticality control on the steel lattice column 10 through multiple channels and multiple directions to ensure the verticality of the steel lattice column 10 in the placing process, and in the final pouring process, the steel lattice column 10 is vertically arranged under the support of the hanging ribs 100 under the action of gravity, and further ensuring the verticality of the steel lattice column 10 in the pouring process, thereby make shaped steel lattice column 10 reach higher straightness that hangs down, and then improve construction quality.
In step 2), the two theodolites 90 are arranged at 90 degrees relative to the section steel lattice column 10, and the verticality measurement deviation is controlled at 1/250 of the excavation depth of the foundation pit, so that the two theodolites 90 respectively test the horizontal angle and the vertical angle of the section steel lattice column 10 from different angles, a more comprehensive three-dimensional observation of the section steel lattice column 10 can be realized, the theodolite 90 can timely discover the inclination of the section steel lattice column 10 towards which region, and the subsequent adjustment is convenient, and of course, the angle formed by the two theodolites 90 relative to the section steel lattice column 10 is preferably 90 degrees.
When two theodolites 90 each other become 90 for shaped steel lattice column 10, if shaped steel lattice column 10 takes place the slope this moment, the angle that two theodolites 90 surveyed will be more obvious, the constructor of being convenient for is to the judgement of shaped steel lattice column 10's state, and then reduces the error that leads to because of theodolite 90 self problem, promotes fault-tolerant rate and the precision in the testing process.
The two theodolites 90 may be at angles other than 180 degrees with respect to the section steel lattice column 10, preferably, the angle between the two theodolites cannot be too large or too small, and the too large or too small angle may cause the angles observed by the two theodolites 90 with respect to the section steel lattice column 10 to be relatively close, and the fault tolerance rate is relatively low, so the angle between the two theodolites is generally controlled within the range of 90 degrees ± 45 degrees.
The section of the section steel lattice column 10 is generally a section steel or a steel plate designed into a biaxial symmetric section or a uniaxial symmetric section, the lattice system member is composed of a limb and a lacing material, the limb mainly bears axial force, the lacing material mainly resists lateral force (relative to the axial direction of the limb), the lacing material of the section steel lattice column 10 mainly has lacing bars and lacing plates, and the structural characteristic of the section steel lattice column 10 is that the material area is arranged at a position far away from an inertia axis, so that the bending resistance of the member can be enhanced under the condition of the same axial resistance, the material is saved, and the weight of the section steel lattice column 10 is reduced.
In step 4), set up first coordinate point 150 and second coordinate point 151 in the both sides of shaped steel lattice column 10, directly act as go-between 270 at first coordinate point 150 and second coordinate point 151 to through the axis position of acting as go-between adjustment shaped steel lattice column 10, can further fix a position the position of shaped steel lattice column 10, realize fixing a position more accurately on the horizontal direction.
In step 6), it is fixed to pass hanging muscle 100 with whippletree 60 after descending shaped steel lattice column 10 accomplishes, and whippletree 60 is transferred and is filled the sleeper and prevent to sink, prevents shaped steel lattice column 10 aversion during the concrete pouring at last, and like this, shaped steel lattice column 10 supports through whippletree 60 that hanging muscle 100 hangs down in stake hole 180, and shaped steel lattice column 10 does not need additionally to exert external force under the effect of gravity, just can keep shaped steel lattice column 10 to be in the state of a high straightness that hangs down under the natural state.
The horizontal bar 60 is the steel material of a high strength, has the jack at its both ends, when inserting hoisting hole 201 or hanging in the muscle 100 again with it, because the circumstances that frictional force and surface are irregular, shaped steel lattice column 10 probably is not vertical arranging, at this moment, can pass through motor or crow bar, insert in the jack, it slowly rotates to drive horizontal bar 60, along with the rotation of horizontal bar 60, shaped steel lattice column 10 can be just to vertical position, thereby reach the mesh of the straightness that hangs down of control type steel lattice column 10.
The section steel lattice column 10 comprises a plurality of angle steels 20, a plurality of supporting beams 30 and a hoisting piece 110; the hoisting piece 110 is fixedly arranged with the section steel lattice column 10, and the hoisting piece 110 is used for hoisting the section steel lattice column 10 by a hoisting machine; hoist and mount piece 110 includes strengthening rib 111 and hangs muscle 100, strengthening rib 111 and shaped steel lattice column 10 fixed arrangement, strengthening rib 111 extends towards shaped steel lattice column 10's upper end, and cross shaped steel lattice column 10 and be vacant and arrange and form epitaxial section 112, hang muscle 100 through welded fastening on strengthening rib 111's epitaxial section 112, on the one hand, strengthening rib 111 can play the effect of strengthening to the intensity of shaped steel lattice column 10 body, on the other hand, strengthening rib 111 is together fixed with shaped steel lattice column 10, be convenient for to lifting by crane and supporting of shaped steel lattice column 10.
Furthermore, in the process of hoisting the section steel lattice column 10 by transportation, the section steel lattice column 10 does not need to be in direct contact with the section steel lattice column 10, so that the section steel lattice column 10 cannot be dragged, the section steel lattice column 10 body cannot be damaged, and the section steel lattice column hoisting device has strong practicability.
In addition, the reinforcing ribs 111 are fixedly arranged on the angle steels 20, one reinforcing rib 111 is fixedly arranged on the inner side wall of each angle steel 20, and each angle steel 20 is a long steel bar with two sides perpendicular to each other to form an angle, so that the reinforcing ribs 111 and the angle steels 20 are fixed to obtain a larger contact area, and the reinforcing ribs 111 and the angle steels 20 are connected more firmly.
A plurality of muscle 100 of hanging are vertical equal altitude of ring form and arrange, hang the orientation that muscle 100 lifted by crane along shaped steel lattice column 10 and arrange, can accept the power that comes from the hoist more efficiently, on the other hand, a plurality of muscle 100 of hanging are equal altitude to be arranged, at the in-process of lifting by crane, it is even to the atress between a muscle 100 of hanging, the common weight of evenly sharing shaped steel lattice column 10, play rings process shaped steel lattice column 10 at shaped steel lattice column 10 and can not take place the slope, the inhomogeneous condition of atress, stability in the improvement work progress.
The plurality of lifting ribs 100 are arranged towards the same direction, so that the lifting head can conveniently operate the lifting ribs 100 in the lifting process.
The upper end of shaped steel lattice column 10 has two hole for hoist 201, and two hole for hoist 201 are located same level, can alternate horizontal bar 60 in the hole for hoist, also can be used for lifting by crane and fixing shaped steel lattice column 10.
The shaped steel lattice column 10 is the cuboid form and arranges, and two hole for hoist 201 form respectively at the top that is two angle steel 20 that the diagonal arranged, and it is more even to enable violently the sentry atress when supporting shaped steel lattice column 10, and the difficult condition such as slope that takes place overturns.
The lateral wall of the angle steel 20 of the periphery of hoist and mount hole 201 is buckled towards inside, forms the conflict wall, and the circumferencial direction of conflict wall has the reinforcing bar for strengthen the intensity of conflict wall, like this, when the whippletree 60 inserts in hoist and mount hole 201, can have bigger area of contact with the inside wall of angle steel 20, on the one hand with the fixed more stable of shaped steel lattice column 10, on the other hand, can also reduce the pressure of shaped steel lattice column 10 to whippletree 60.
However, in the actual operation process, the weight of each part of the lifted section steel lattice column 10 is not uniform, and therefore, even if the lifting ribs 100 are installed around the section steel lattice column 10, in the lifting process, the section steel lattice column 10 cannot be ensured to be arranged in a vertical state, and therefore, the reinforcing ribs connected with the lifting ribs 100 can be replaced by retractable chain structures or retractable columns, the retractable columns and the retractable chain structures can be controlled by a motor, and the length of the four retractable columns or chains can be adjusted by the motor.
Specifically, taking a telescopic column as an example, the connection points of the telescopic column and four corners of the section steel lattice column 10 are A, B, C, D four fixed points respectively, in the process of measuring the inclination of the section steel lattice column 10 by the theodolite 90, when the part a of the section steel lattice column 10 is too high or too low, the length of the telescopic column connected with the part a is adjusted by the starting motor, and similarly, the length of the telescopic column connected with the part a is adjusted by the corresponding B, C, D respectively until the data measured by the theodolite 90 show that the section steel lattice column 10 is vertically arranged.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The construction method for controlling the verticality of the foundation pit section steel lattice column is characterized by comprising the following construction steps of:
1) prefabricating the section steel lattice column, and reserving a hoisting hole in the manufacturing process of the section steel lattice column;
2) hoisting the section steel lattice column to the position above the pile hole, erecting two theodolites for measuring the section steel lattice column at the moment, wherein the two theodolites are positioned in different directions, and the visual angle is based on the observation of three leg edges;
3) welding a reinforcement cage;
4) after the section steel lattice column is welded, slowly lowering the section steel lattice column to the elevation of the section steel lattice column, remeasuring the position and the verticality of the section steel lattice column, then inserting a cross bar into the hoisting hole, flatly fixing, and welding a hoisting rib;
5) carrying out plane position positioning on the section steel lattice column;
6) pouring concrete;
in the step 4), a first coordinate point and a second coordinate point are arranged on two sides of the section steel lattice column, a pull wire is directly pulled between the first coordinate point and the second coordinate point, and the axis position of the section steel lattice column is adjusted through the pull wire;
in step 6), after the downward placement of the section steel lattice column is finished, a cross bar penetrates through the hanging bars for fixing, a sleeper below the cross bar is prevented from sinking, and finally, the section steel lattice column is prevented from shifting when concrete is poured; the two ends of the cross bar are provided with insertion holes, and when the section steel lattice column is not vertically arranged, the section steel lattice column is inserted into the insertion holes through a motor or a crow bar to drive the cross bar to rotate, so that the section steel lattice column is rightly arranged to a vertical position;
the section steel lattice column comprises a plurality of angle steels and a plurality of supporting beams; the hoisting piece is fixedly arranged with the section steel lattice column, and the hoisting piece is used for hoisting the section steel lattice column by a hoisting machine; the lifting piece comprises a reinforcing rib and the lifting rib, the reinforcing rib and the section steel lattice column are fixedly arranged, the reinforcing rib extends towards the upper end of the section steel lattice column and passes through the section steel lattice column to be arranged in a vacant mode to form an extension section, and the lifting rib is fixed on the extension section of the reinforcing rib in a welded mode;
replacing the reinforcing ribs connected with the hanging ribs with retractable chain structures or retractable columns, wherein the retractable columns or the retractable chain structures are controlled by a motor, and the lengths of the four retractable columns or the retractable chain structures are adjusted;
the upper end of the section steel lattice column is provided with two hoisting holes, and the two hoisting holes are positioned at the same horizontal height; the section steel lattice column is arranged in a cuboid shape, and the two hoisting holes are formed in the tops of the two angle steels which are arranged diagonally respectively; the lateral wall of the angle steel of the periphery of hoist and mount hole is buckled towards inside, forms and conflicts the wall, and the circumferencial direction that conflicts the wall has the reinforcing bar.
2. The construction method for controlling the verticality of a foundation pit type steel lattice column according to claim 1, wherein in step 2), two theodolites are arranged at 90 ° to each other with respect to the type steel lattice column.
3. The construction method for controlling the verticality of the foundation pit type steel lattice column according to any one of claims 1 to 2, wherein the reinforcing ribs are fixedly arranged on the angle steels, and one reinforcing rib is fixedly arranged on the inner side wall of each angle steel.
4. The construction method for controlling the perpendicularity of the foundation pit type steel lattice column according to any one of claims 1 to 2, wherein the plurality of the suspension bars are vertically arranged in a circular ring shape at the same height.
5. The method of constructing a foundation pit steel lattice column according to any one of claims 1 to 2, wherein a plurality of the suspension bars are arranged in the same direction.
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| CN201911206066.5A CN110872843B (en) | 2019-11-29 | 2019-11-29 | Construction method for controlling verticality of foundation pit section steel lattice column |
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| CN201911206066.5A CN110872843B (en) | 2019-11-29 | 2019-11-29 | Construction method for controlling verticality of foundation pit section steel lattice column |
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| CN101586964B (en) * | 2008-05-23 | 2012-02-01 | 上海船厂船舶有限公司 | Method for calibrating theodolite in aquatic measurement |
| CN109385997B (en) * | 2017-08-04 | 2021-01-15 | 上海宝冶集团有限公司 | Construction method of PHC tubular pile under narrow field condition |
| CN207891889U (en) * | 2017-12-18 | 2018-09-21 | 时琳珺 | A kind of recyclable lattice column guider |
| CN108867663A (en) * | 2018-08-24 | 2018-11-23 | 浙江大东吴集团建设有限公司 | A kind of control device and localization method of steel pile verticality |
| CN209129002U (en) * | 2018-11-01 | 2019-07-19 | 深圳市工勘岩土集团有限公司 | The constructing structure of combined type deep foundation pit supporting structure |
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