CN116607809A - Automatic underpinning and resetting device for pier assembly and construction method thereof - Google Patents
Automatic underpinning and resetting device for pier assembly and construction method thereof Download PDFInfo
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- CN116607809A CN116607809A CN202310655358.7A CN202310655358A CN116607809A CN 116607809 A CN116607809 A CN 116607809A CN 202310655358 A CN202310655358 A CN 202310655358A CN 116607809 A CN116607809 A CN 116607809A
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- 238000009424 underpinning Methods 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 133
- 239000010959 steel Substances 0.000 claims abstract description 133
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000008400 supply water Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000002787 reinforcement Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 238000010008 shearing Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of civil engineering reinforcement underpinning and transformation, in particular to an automatic underpinning and resetting device for a pier assembly and a construction method thereof, wherein the automatic underpinning and resetting device comprises a plurality of groups of upper steel corbels and lower steel corbels which are respectively connected to an underpinned pier, and a lifting support column is fixed between each group of upper steel corbels and each group of lower steel corbels by using cantilever bolts; the hydraulic pressure gauge is connected with the automatic pressure maintaining water supply device. Compared with the prior art, the invention has the advantages that: the underpinning sedimentation regulation displacement monitoring is converted into pressure monitoring, so that the influence of the environment is smaller; the joint surface of the underpinning bracket and the underpinned pier column introduces the latest second-order tooth contact interface, so that the shearing and sliding resistance is greatly improved; the liquid bags are adopted for automatically maintaining pressure and supplying water, so that the risk of oil leakage and pollution is low, and the long-term use cost is low; each pillar pier realizes double insurance of liquid sac bearing and peripheral lifting temporary support bearing; the device simple structure, it is convenient to assemble, and the efficiency of construction is high, and the security is high.
Description
Technical Field
The invention relates to the technical field of civil engineering reinforcement underpinning and transformation, in particular to an automatic underpinning and resetting device for a column pier assembly type and a construction method thereof.
Background
The structural support and exchange is a technology for changing the load transmission route of the engineering structure. With the development of the building industry in China, the construction process gradually enters a new construction stage, a reinforcement and reconstruction stage and a repeated stage from a large-scale new construction stage, and the vigorous development of urban updating and construction activities, the projects such as reinforcement, displacement, large-space reconstruction, underground space development, tunnel crossing of the existing pile foundation building and the like of the existing engineering structure are increasingly increased. In the above engineering, column pier underpinning is a key engineering technology commonly used.
The column pier support and exchange technology generally converts the vertical load originally transferred from the column pier to the foundation to be transferred through a system composed of support nodes, supporting jacks and the like matched with the support nodes. In the underpinning process, after the underpinning nodes and the supports below the nodes are completed, the column piers are often required to be cut and separated from the foundation, so that the transformation of unloading and load transmission paths is realized.
The column pier support is researched by scholars and engineering technicians at home and abroad, and various support and exchange node forms are designed, wherein the most common mode is a column holding beam and beam column contact interface bar planting mode. The underpinning node form needs wet operations such as concrete pouring and the like, then maintenance is carried out, and the construction period is long. Therefore, the institutions such as the university of river and sea design prestressed concrete assembly type and steel structure assembly type pier underpinning nodes, and test researches and engineering test point application are carried out. These studies did not take into account the differential sedimentation factor at the same time.
In order to ensure the safety of the upper structure when the underpinning structure generates uneven settlement, based on the active underpinning concept, the Shanghai heaven building shift engineering company proposes the idea of superposing a vertical jack in a movable support. However, the assembly units of the assembly type underpinning nodes are huge, the construction difficulty is high, the dimension needs to be customized, the adaptability to the sectional shape of the column is poor, and the engineering cost is greatly improved. Thus, new forms of prefabricated underpinning nodes that are simple to construct and operate should be further developed.
When a plurality of column piers are synchronously integrated for underpinning, a PLC (logic programming controller) system is often adopted for automatic adjustment of sedimentation difference in the active underpinning engineering, and the system has higher standby energy consumption and cost, and particularly when the number of the underpinning column piers is smaller, the underpinning structure has longer stress time period, and the cost performance difference is more obvious. Therefore, a novel sedimentation difference automatic regulation and control system with low cost and simple structure should be developed.
The common temporary supports in the structure underpinning system are steel upright posts, hydraulic jacks and the like, a displacement sensor is adopted for assisting in monitoring sedimentation, and a command is sent after feedback to adjust the temporary support height. The displacement sensor is easy to be influenced by the environment on the construction site, so that the sedimentation difference regulating effect is achieved.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the automatic underpinning and resetting device for the assembled pier, which has the advantages of simple structure, convenient construction, high efficiency and low pollution, and the construction method thereof.
In order to achieve the aim, the automatic underpinning and resetting device for the pier assembly is designed and comprises a plurality of groups of upper steel corbels and lower steel corbels, wherein the upper steel corbels and the lower steel corbels are connected to the underpinned pier, and a lifting support column is fixed between each group of upper steel corbels and each group of lower steel corbels by using overhanging bolts; the hydraulic pressure gauge is characterized by further comprising a hydraulic bag, wherein the hydraulic bag is arranged in the middle of the cut-off supported column pier, the hydraulic bag is connected with the pressure gauge and the automatic pressure-maintaining water supply device, and the sleeve is assembled at the periphery of the hydraulic bag in a restricted manner by the sleeve hoop to form a whole.
Preferably, the sets of upper and lower steel brackets are secured to the underpinned pier by bracket shear bolts and steel plates with second order teeth, and then tightened by sets of walan screws hooked to the steel bracket anchor ring.
Preferably, the upper steel bracket or the lower steel bracket consists of an H-shaped steel with different lengths of flanges, a steel plate with second-order teeth and an assembled stiffening rib, wherein one side of the steel plate with the second-order teeth, which is connected with the H-shaped steel, is a vertical plane, and the contact surface with the column surface is provided with a tooth surface, and is provided with a first-order big tooth and a plurality of groups of second-order small teeth; the upper and lower flange plates on two sides of the web are provided with reserved grooves for installing stiffening ribs, and a plurality of groups of anchor rings are welded on two sides of the outer side of the web, which is close to the edge from top to bottom.
Preferably, the lifting support column consists of a steel spiral core barrel and a steel spiral sleeve, the steel spiral core barrel and the steel spiral sleeve are nested together through a turnbuckle, an end plate at the upper end of the steel spiral core barrel is hung on the lower flange of the upper steel bracket through a support suspension bolt, and a loading rod hole is formed in the lower portion of the steel spiral sleeve and penetrates into the loading rod.
Preferably, the assembled pile casing is composed of a group of L-shaped steel guard plate units, an upper semicircular notch and a lower semicircular notch are arranged on two side faces, a plurality of rubber protrusions are arranged on the outer sides of the vertical plates from top to bottom, the whole group of L-shaped steel guard plate units are in contact with each other to form a closed pile casing, the periphery inside the pile casing is not in contact with the surface of a supported column pier, and the upper parts of the rubber protrusions are hoops.
The construction method of the pier-assembled automatic underpinning and resetting device comprises the following steps:
1) Placing cutting lines in the designed height of the column pier support, wherein the distance between the cutting lines is matched with the height of the liquid sac;
2) Polishing the surface of the column pier at the upper and lower adjacent parts outside the column pier cutting area, wherein the shape of the column pier is basically consistent with the shape of the steel plate with the second-order teeth in the steel corbel;
3) Coating cement mortar, wherein the strength of the mortar is not lower than that of the pier concrete;
4) Installing upper and lower steel corbels, fixing the upper and lower steel corbels by using expansion bolts or anchor bolts, and keeping the lower surface horizontal;
5) Installing a Hualan screw, screwing, and assembling the upper and lower steel corbels into two underpinning platforms; 6) Lifting support columns are arranged between each group of upper steel corbels and lower steel corbels, an upper end plate is suspended at the lower parts of the upper steel corbels by using suspension bolts, and loading rods are inserted into loading rod holes of the steel spiral sleeve one by one to adjust the height until the steel spiral sleeve is tightly propped against the steel corbels;
7) Penetrating a static cutting rope saw from a support column gap to cut a column pier; cutting, putting the sleeve into sleeve rings with matched sizes, and temporarily fixing the sleeve rings in reserved sections at the upper end and the lower end of the column pier;
8) Selecting a liquid sac matched with the pier in size, placing the liquid sac in a pier cutting area, and then connecting a pressure gauge, a water supply and drainage valve and a pressure maintaining water supply device;
9) And (3) water filling pressure test: a displacement meter is arranged between the upper column end and the lower column end, then water is filled into the high-pressure liquid bag for pressurization until the upper column end has an upward movement sign, and then pressure is relieved;
10 Weighing and pressure measuring: the lifting support columns around are unscrewed, the upper column has signs of sinking, the liquid bag is pressurized to supply water, the upper column end is jacked back to the original elevation, the pressure is the water pressure to keep the target value,
11 Mounting a casing: firstly, arranging pre-arranged hoops for one circle along a supported column pier, sleeving the arranged hoops under the column pier, and increasing the strength of downward hoops when the hoops reach a rubber bulge, wherein the lower hoops can pass through the rubber bulge of the layer after the rubber bulge is deformed, so that one hoop is arranged on each layer corresponding to the upper part of the rubber bulge; continuously extruding the cuff to the rubber, and stopping extruding the cuff when the cuff has a tightening feel;
12 All supports are screwed again, and the device is in an automatic standby state.
Preferably, the method further comprises the step of lifting the support column for adjusting the state:
1) In the condition of settlement or shutdown of the supported column, the standby state of the lifting support column is that the upper steel bracket and the lower steel bracket are propped up, when the column is settled, the water pressure measured by the pressure gauge is reduced, the pressure maintaining water supply device automatically adjusts water supply to ensure that the upper column is restored to the elevation state, and then the lifting support column is adjusted one by one to be stretched to the propped up state;
2) In the working condition of settlement and uplift of the supported column, the stand-by state of the lifting support column is an unstressed state.
Compared with the prior art, the invention has the advantages that:
1. converting the underpinning sedimentation regulation displacement monitoring into pressure monitoring less affected by the environment;
2. the latest second-order tooth contact interface is introduced into the connecting surface of the underpinning bracket and the underpinned pier column, so that the shearing and sliding resistance is greatly improved;
3. the automatic pressure-maintaining water supply by adopting the liquid bag effectively solves the problems of high oil leakage pollution risk, high long-term use cost and the like of a PLC system;
4. each column pier realizes double insurance of liquid sac bearing and peripheral lifting temporary support bearing;
5. the device simple structure, it is convenient to assemble, and the efficiency of construction is high, and the security is high.
Drawings
FIG. 1 is a system-installed elevation view of a reset apparatus provided by the present invention;
FIG. 2 is a bracket mounting cross-sectional view of the reduction device provided by the invention;
FIG. 3 is an elevation view of the bracket construction of the resetting device provided by the invention;
FIG. 4 is an enlarged view of the lifting support of the resetting device provided by the invention;
FIG. 5 is a sectional view of a casing fluid bladder installation of the reset device provided by the present invention;
fig. 6 is an elevation view of a cartridge wall element of the reset device provided by the present invention.
In the figure:
1. the pillar pier is replaced; 2. feeding steel corbels; 3. lower steel corbels; 4. lifting the support column; 5. a protective barrel; 6. a high pressure fluid bladder; 7. a pressure gauge; 8. a pressure maintaining water supply device; 9. a Hualan screw; 10. bracket shear bolts; 11. supporting a suspension bolt; 12. a ferrule;
2-1, H-shaped steel with unequal flanges; 2-2, a steel plate with second-order teeth; 2-3, first-order large teeth; 2-4, second order small teeth; 2-5, a first bolt hole; 2-6, anchor ring; 2-7, reserving a groove; 2-8, assembled stiffening ribs; 2-9, a second bolt hole;
4-1, a steel spiral core barrel; 4-2, a steel spiral sleeve; 4-3, bolt holes 3;4-4, loading rod holes; 4-5, loading rod;
5-1, an L-shaped steel guard plate unit; 5-2, semicircular notch; 5-3, rubber convexity.
Detailed Description
The construction and principles of the present invention will be readily apparent to those skilled in the art from the following description taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the invention discloses an automatic underpinning and resetting device for a pier assembly, which comprises a plurality of groups of upper steel brackets, lower steel brackets, lifting support columns, an assembled pile casing, a high-pressure liquid bag, a pressure gauge and an automatic pressure-maintaining water supply device.
The upper steel corbels and the lower steel corbels are fixed on the underpinned pier through corbel shear bolts and steel plates with second-order teeth, and then are tensioned through a plurality of groups of Hualan screws hooked on the anchor rings of the steel corbels. The lifting support column is fixed between each group of upper steel corbel and lower steel corbel by using overhanging bolts, the lifting support column consists of a steel spiral core barrel and a steel spiral sleeve, the steel spiral core barrel and the steel spiral sleeve are nested together through a turnbuckle, an end plate at the upper end of the steel spiral core barrel is hung on the lower flange of the upper steel corbel through supporting hanging bolts, a loading rod hole is formed in the lower part of the steel spiral sleeve, the loading rod penetrates into the loading rod, and the loading rod is rotated until the loading rod is tightly propped up, so that the height adjustment is easy to realize.
The upper steel bracket or the lower steel bracket consists of an H-shaped steel with different lengths of flanges, a steel plate with second-order teeth and an assembled stiffening rib, one side of the steel plate with the second-order teeth, which is connected with the H-shaped steel, is a vertical plane, and the contact surface of the steel plate with the second-order teeth and the column surface is provided with a tooth surface, and is provided with a first-order big tooth and a plurality of groups of second-order small teeth; the upper and lower flange plates on two sides of the web are provided with reserved grooves for installing stiffening ribs, and a plurality of groups of anchor rings are welded on two sides of the outer side of the web, which is close to the edge from top to bottom.
The main function of the anchor ring is that when a group of steel corbels are assembled, the steel corbels can be connected in pairs through the Walland screws, the Walland screws are screwed down, and prestress can be applied to the group of underpinned corbels, so that the stability and the reliability of the steel corbels under stress are improved. The contact surface of the steel corbel and the supported column pier introduces the latest scientific research results, and the second-order tooth contact interface has better force transmission performance.
The spiral nested device is used for adjusting the supporting height, belongs to a mature technology, and is rarely used for engineering sites due to the existence of hydraulic jacks. However, when the hydraulic jack is used as a temporary support, the equipment is affected by leakage and is easy to fall. Moreover, multiple jacks are synchronously started, and a PLC synchronous displacement control system is often required.
In order to ensure that the steel corbels and the column surface have enough contact area, firstly, the column surface is polished at the upper and lower adjacent parts outside the column pier cutting area, and the shape is basically consistent with the shape of the steel plate 2-2 with the second-order teeth in the steel corbels; and (3) coating cement mortar with the thickness of 2-3mm to ensure the compactness of the contact surface, wherein the strength of the mortar is not lower than that of the pier concrete.
Cutting a column pier after the temporary support is propped up; and selecting a matched high-pressure liquid bag according to the size of the cutting section, and installing the high-pressure liquid bag in a space after the column pier is partially cut, wherein the periphery of the high-pressure liquid bag is basically leveled with the outer edge line of the column pier.
The liquid bag is arranged in the middle of the cut-off underpinned column pier, is connected with the pressure gauge and the automatic pressure-maintaining water supply device, and is assembled with the sleeve hoop in a restraining mode to form a whole.
The assembled pile casing consists of a group of L-shaped steel guard plate units, an upper semicircular notch and a lower semicircular notch are arranged on two side surfaces of the assembled pile casing, a plurality of rubber protrusions are arranged on the outer sides of the vertical plates from top to bottom, the whole group of L-shaped steel guard plate units are contacted with each other to form a closed pile casing, the inner diameter of the closed pile casing is 10-20 mm larger than the diameter of a supported pier, and the height of the closed pile casing extends upwards and downwards to be not less than 50mm in a pier cutting area; the periphery of the inner part of the pile casing is not contacted with the surface of the supported and replaced column pier, the minimum gap is not less than 2mm, the upper part of the rubber bulge is a hoop, and the outer diameter of a pattern enclosed by the rubber bulge points with the same elevation is more than 2mm larger than the inner diameter of the hoop.
The setting of a protective cylinder mainly prevents the liquid sac from generating larger deformation at the periphery, thereby causing failure in controlling vertical displacement. The semicircular notch is a reserved pipeline port, and after two adjacent L-shaped guard plate units are spliced, a round hole is formed; the connecting pipe of the pressure maintaining water supply equipment is connected with the liquid bag through the pipeline port.
The cartridge guard unit size and shape should take into account the pier cross-sectional shape. After the column is cut off, a plurality of hoops are sleeved in the liquid sac before the liquid sac is installed. And (5) after the air bag is restarted, pile casing assembly can be performed. When the combined type pile head is assembled, firstly, the pre-placed hoops are used for placing the pile head protecting units along the supported column piers for one circle, every two adjacent hoops are sleeved with the placed hoops, the downward hoops are blocked when reaching the rubber bulge, the downward hoops are increased in strength, and after the rubber bulge is deformed, the lower hoops can pass through the rubber bulge of the layer. So that each layer is provided with a cuff corresponding to the upper part of the rubber bulge. The cuff is continuously pressed convexly toward the rubber, and when the cuff has a tightening feel, the pressing of the cuff is stopped.
And (3) water filling pressure test: installing a displacement meter with the precision not less than 0.1mm between the upper column end and the lower column end, filling water into the high-pressure liquid bag for pressurization until the upper column end has upward movement signs, and checking whether the working states of water leakage, a pressure gauge, a valve and the like are normal or not; and then releasing the pressure, wherein the pressure release amplitude is not less than 20% of the pressure test.
Weighing and measuring pressure: loosening the lifting support columns 4 around, wherein the upper column has signs of sinking, and the maximum sinking is not more than 1mm; the liquid bag is pressurized to supply water, the upper column end is propped back to the original elevation, and the pressure is the water pressure maintaining target value.
The construction method of the pier-assembled automatic underpinning and resetting device is characterized by comprising the following steps of:
1) Placing cutting lines in the designed height of the column pier support, wherein the distance between the cutting lines is matched with the height of the liquid sac;
2) Polishing the surface of the column pier at the upper and lower adjacent parts outside the column pier cutting area, wherein the shape of the column pier is basically consistent with the shape of the steel plate with the second-order teeth in the steel corbel;
3) Coating cement mortar, wherein the strength of the mortar is not lower than that of the pier concrete;
4) Installing upper and lower steel corbels, fixing the upper and lower steel corbels by using expansion bolts or anchor bolts, and keeping the lower surface horizontal;
5) Installing a Hualan screw, screwing, and assembling the upper and lower steel corbels into two underpinning platforms;
6) Lifting support columns are arranged between each group of upper steel corbels and lower steel corbels, an upper end plate is suspended at the lower parts of the upper steel corbels by using suspension bolts, and loading rods are inserted into loading rod holes of the steel spiral sleeve one by one to adjust the height until the steel spiral sleeve is tightly propped against the steel corbels;
7) Penetrating a static cutting rope saw from a support column gap to cut a column pier; cutting, putting the sleeve into sleeve rings with matched sizes, and temporarily fixing the sleeve rings in reserved sections at the upper end and the lower end of the column pier;
8) Selecting a liquid sac matched with the pier in size, placing the liquid sac in a pier cutting area, and then connecting a pressure gauge, a water supply and drainage valve and a pressure maintaining water supply device;
9) And (3) water filling pressure test: installing a displacement meter with the precision not less than 0.1mm between the upper column end and the lower column end, filling water into the high-pressure liquid bag for pressurization until the upper column end has upward movement signs, checking whether the working states of water leakage, a pressure gauge, a valve and the like are normal, and then releasing the pressure, wherein the pressure release amplitude is not less than 20% of the pressure test;
10 Weighing and pressure measuring: loosening the lifting support columns around, enabling the upper column to have sinking signs, enabling the maximum sinking to be not more than 1mm, pressurizing the liquid bag to supply water, pushing the upper column end back to the original elevation, enabling the pressure to be the water pressure maintaining target value,
11 Mounting a casing: firstly, arranging pre-arranged hoops for one circle along a supported column pier, sleeving the arranged hoops under the column pier, and increasing the strength of downward hoops when the hoops reach a rubber bulge, wherein the lower hoops can pass through the rubber bulge of the layer after the rubber bulge is deformed, so that one hoop is arranged on each layer corresponding to the upper part of the rubber bulge; continuously extruding the cuff to the rubber, and stopping extruding the cuff when the cuff has a tightening feel;
12 All supports are screwed again, and the device is in an automatic standby state.
The lifting support column is also suitable for the setting of two different working conditions, namely a supported column sedimentation or shutdown working condition and a supported column sedimentation and uplift working condition.
1) And in the working condition of sedimentation or shutdown of the supported column, the stand-by state of the lifting support column is that the upper steel bracket and the lower steel bracket are tightly propped. When the column subsides, the pressure gauge detects that the water pressure is reduced, then the pressure maintaining water supply device automatically adjusts water supply, the upper column is guaranteed to restore to the original elevation state, and then the lifting support columns are adjusted one by one, so that the lifting support columns are stretched to a jacking state. 2) In the working condition of settlement and uplift of the supported column, the standby state of the lifting support column 4 is an unstressed state, and the distance between the lower end plate of the steel spiral sleeve and the top flange plate of the lower bracket is 1-2 mm.
The pressure gauge test data are archived and checked in real time, and monitoring staff set up to periodically check pressure change records, and the interval is not more than 24 hours.
The above description is only specific to the embodiments of the invention, but the scope of the invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the invention pertains shall apply to the technical solution and the novel concept according to the invention, and shall all be covered by the scope of the invention.
Claims (7)
1. The automatic underpinning and resetting device for the column pier assembly comprises a plurality of groups of upper steel corbels and lower steel corbels, wherein the upper steel corbels and the lower steel corbels are connected to an underpinned column pier, and the automatic underpinning and resetting device is characterized in that a lifting support column is fixed between each group of upper steel corbels and each group of lower steel corbels by using overhanging bolts; and also comprises
The liquid bag is arranged in the middle of the cut-off underpinned column pier, the liquid bag is connected with the pressure gauge and the automatic pressure-maintaining water supply device, and the sleeve is assembled on the periphery of the liquid bag in a restricted mode to form a whole.
2. An automatic underpinning and resetting device for assembling piers according to claim 1, wherein the upper steel corbels and the lower steel corbels of the groups are fixed to the underpinned piers through corbel shear bolts and steel plates with second-order teeth, and then are tensioned through the groups of Hualan screws hooked on anchor rings of the steel corbels.
3. The automatic underpinning and resetting device for the pier assembly according to claim 1, wherein the upper steel bracket or the lower steel bracket consists of an H-shaped steel with unequal flange lengths, a steel plate with second-order teeth and an assembled stiffening rib, one side of the steel plate with the second-order teeth, which is connected with the H-shaped steel, is a vertical plane, the contact surface with the surface of the column is a toothed surface, and a first-order big tooth and a plurality of groups of second-order small teeth are arranged; the upper and lower flange plates on two sides of the web are provided with reserved grooves for installing stiffening ribs, and a plurality of groups of anchor rings are welded on two sides of the outer side of the web, which is close to the edge from top to bottom.
4. The automatic underpinning and resetting device for the pier assembly type is characterized in that the lifting support column consists of a steel spiral core barrel and a steel spiral sleeve, the steel spiral core barrel and the steel spiral sleeve are nested together through a turnbuckle, an upper end plate of the steel spiral core barrel is suspended on a lower flange of an upper steel bracket through a support suspension bolt, and a loading rod hole is formed in the lower portion of the steel spiral sleeve and penetrates through the loading rod.
5. The automatic underpinning and resetting device for the assembled column pier is characterized in that the assembled column protection is composed of a group of L-shaped steel protection plate units, an upper semicircular notch and a lower semicircular notch are formed in two side faces of the assembled column protection, a plurality of rubber protrusions are arranged on the outer sides of vertical plates from top to bottom, the whole group of L-shaped steel protection plate units are contacted in pairs to form a closed column protection, the periphery inside the column protection is not contacted with the surface of the underpinned column pier, and the upper parts of the rubber protrusions are hoops.
6. A construction method adopting the automatic underpinning and resetting device of the pier assembly type according to any one of claims 1 to 5, which is characterized in that the method comprises the following steps:
1) Placing cutting lines in the designed height of the column pier support, wherein the distance between the cutting lines is matched with the height of the liquid sac;
2) Polishing the surface of the column pier at the upper and lower adjacent parts outside the column pier cutting area, wherein the shape of the column pier is basically consistent with the shape of the steel plate with the second-order teeth in the steel corbel;
3) Coating cement mortar, wherein the strength of the mortar is not lower than that of the pier concrete;
4) Installing upper and lower steel corbels, fixing the upper and lower steel corbels by using expansion bolts or anchor bolts, and keeping the lower surface horizontal;
5) Installing a Hualan screw, screwing, and assembling the upper and lower steel corbels into two underpinning platforms;
6) Lifting support columns are arranged between each group of upper steel corbels and lower steel corbels, an upper end plate is suspended at the lower parts of the upper steel corbels by using suspension bolts, and loading rods are inserted into loading rod holes of the steel spiral sleeve one by one to adjust the height until the steel spiral sleeve is tightly propped against the steel corbels;
7) Penetrating a static cutting rope saw from a support column gap to cut a column pier; cutting, putting the sleeve into sleeve rings with matched sizes, and temporarily fixing the sleeve rings in reserved sections at the upper end and the lower end of the column pier;
8) Selecting a liquid sac matched with the pier in size, placing the liquid sac in a pier cutting area, and then connecting a pressure gauge, a water supply and drainage valve and a pressure maintaining water supply device;
9) And (3) water filling pressure test: a displacement meter is arranged between the upper column end and the lower column end, then water is filled into the high-pressure liquid bag for pressurization until the upper column end has an upward movement sign, and then pressure is relieved;
10 Weighing and pressure measuring: the lifting support columns around are unscrewed, the upper column has signs of sinking, the liquid bag is pressurized to supply water, the upper column end is jacked back to the original elevation, the pressure is the water pressure to keep the target value,
11 Mounting a casing: firstly, arranging pre-arranged hoops for one circle along a supported column pier, sleeving the arranged hoops under the column pier, and increasing the strength of downward hoops when the hoops reach a rubber bulge, wherein the lower hoops can pass through the rubber bulge of the layer after the rubber bulge is deformed, so that one hoop is arranged on each layer corresponding to the upper part of the rubber bulge; continuously extruding the cuff to the rubber, and stopping extruding the cuff when the cuff has a tightening feel;
12 All supports are screwed again, and the device is in an automatic standby state.
7. A method of construction according to claim 6, further comprising adjusting the condition of the lifting support column:
1) In the condition of settlement or shutdown of the supported column, the standby state of the lifting support column is that the upper steel bracket and the lower steel bracket are propped up, when the column is settled, the water pressure measured by the pressure gauge is reduced, the pressure maintaining water supply device automatically adjusts water supply to ensure that the upper column is restored to the elevation state, and then the lifting support column is adjusted one by one to be stretched to the propped up state;
2) In the working condition of settlement and uplift of the supported column, the stand-by state of the lifting support column is an unstressed state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310655358.7A CN116607809A (en) | 2023-06-05 | 2023-06-05 | Automatic underpinning and resetting device for pier assembly and construction method thereof |
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| CN202310655358.7A CN116607809A (en) | 2023-06-05 | 2023-06-05 | Automatic underpinning and resetting device for pier assembly and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117188818A (en) * | 2023-10-23 | 2023-12-08 | 山东省建筑工程质量检验检测中心有限公司 | double-T-shaped assembled friction type steel corbel system and method |
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2023
- 2023-06-05 CN CN202310655358.7A patent/CN116607809A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117188818A (en) * | 2023-10-23 | 2023-12-08 | 山东省建筑工程质量检验检测中心有限公司 | double-T-shaped assembled friction type steel corbel system and method |
| CN117188818B (en) * | 2023-10-23 | 2024-07-02 | 山东省建筑工程质量检验检测中心有限公司 | Double-T-shaped assembled friction type steel corbel system and method |
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