CN108560611B - Anchoring structure for basement after inclined floating, resetting and leveling and construction method - Google Patents
Anchoring structure for basement after inclined floating, resetting and leveling and construction method Download PDFInfo
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- CN108560611B CN108560611B CN201810053359.3A CN201810053359A CN108560611B CN 108560611 B CN108560611 B CN 108560611B CN 201810053359 A CN201810053359 A CN 201810053359A CN 108560611 B CN108560611 B CN 108560611B
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- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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Abstract
The invention relates to an anchoring structure of a basement after inclined floating, resetting and leveling and a construction method. The anchor structure is "do" type anchor structure, and the anchor structure includes the anchor stake, the concrete bottom plate, the bed course, grout is full of layer and upper seal, anchor stake upper end and concrete bottom plate fixed connection, the concrete bottom plate lower extreme is equipped with the bed course, be equipped with grout filling layer between bed course and the concrete bottom plate, the concrete bottom plate up end is equipped with upper seal, be equipped with three anchor stake reinforcing bars in the anchor stake, three anchor stake reinforcing bar upper ends run through the concrete bottom plate and stretch into upper seal, be equipped with the anchor slab in the upper seal, the anchor slab cover is on three anchor stake reinforcing bars. The anchoring structure and the construction method have the advantages of simple and firm structure, reliable quality and strong occlusion force, can effectively improve the anti-floating reinforcing effect of the basement, and have high overall strength, convenient and quick construction and low construction cost.
Description
Technical Field
The invention relates to an anchoring structure, in particular to an anchoring structure and a construction method for a basement after inclined floating, reset and leveling, and belongs to the technical field of constructional engineering.
Background
In the construction process of a building, due to the influence of design defects, rainstorm, construction measure invalidity and other comprehensive factors, quality accidents that the basement of the built building engineering floats upwards obliquely sometimes occur.
The general treatment methods are as follows: firstly, reconstruction is abandoned, and loss is great; secondly, the structure is reinforced, reset and leveled, the anchor rod is additionally planted, the structure load is increased, the defects are that the bottom plane of the bottom plate cannot realize ideal level and has a cavity with a cushion layer in the actual situation, in addition, the additionally planted anchor rod has large construction difficulty under the condition that the building space of the basement is limited, the reinforcing method has multiple quality defects and high cost.
Disclosure of Invention
Aiming at the defects, the invention aims to provide the anchoring structure and the construction method after the basement is obliquely floated, reset and leveled, wherein the anchoring structure has the advantages of simple and firm structure, reliable quality, good anti-floating effect, high overall strength, convenience and quickness in construction and low construction cost.
Therefore, the technical scheme adopted by the invention is as follows:
the anchor structure is "do" type anchor structure, and the anchor structure includes the anchor stake, the concrete bottom plate, the bed course, grout is full of layer and upper seal, anchor stake upper end and concrete bottom plate fixed connection, the concrete bottom plate lower extreme is equipped with the bed course, be equipped with grout filling layer between bed course and the concrete bottom plate, the concrete bottom plate up end is equipped with upper seal, be equipped with three anchor stake reinforcing bars in the anchor stake, three anchor stake reinforcing bar upper ends run through the concrete bottom plate and stretch into upper seal, be equipped with the anchor slab in the upper seal, the anchor slab cover is on three anchor stake reinforcing bars.
As a further improvement of the technical scheme, the upper ends of the three anchor pile reinforcing steel bars are provided with horizontal sections, and the tail ends of the horizontal sections are provided with downward hooks.
As a further improvement of the technical scheme, a plurality of upper seal layer steel bars which are horizontally arranged are arranged in the upper seal layer.
As a further improvement of the technical scheme, a half-inverted U-shaped hanging rib is connected between the upper sealing layer and the concrete bottom plate, the upper end of the hanging rib is positioned in the upper sealing layer, and the lower end of the hanging rib is positioned in the concrete bottom plate.
As a further improvement of the technical scheme, the anchor pile reinforcing steel bar is formed by connecting a plurality of unit reinforcing steel bars in series, the length of each unit reinforcing steel bar is smaller than the height of the basement, and adjacent unit reinforcing steel bars are connected through a connecting sleeve.
A construction method of an anchoring structure of a basement after inclined floating, resetting and leveling comprises the following steps:
knocking a concrete bottom plate, forming a plurality of windows at the hollow parts of the concrete bottom plate, uniformly forming a plurality of holes in the concrete bottom plate after the primary grouting is finished, laying a high-pressure grouting system, pouring high-strength cement slurry to the whole position below the concrete bottom plate, observing the elevation of a basement in the grouting process, controlling the grouting pressure within 280KPa, knocking the concrete bottom plate again, confirming that no hollow part exists, checking whether the basement is lifted and controlled within 5mm, and ensuring that the hollow part between the concrete bottom plate and a cushion layer is filled with the cement slurry within 1cm of the height difference of the basement;
secondly, embedding anchor pile reinforcing steel bars into the anchor piles, wherein the model of the anchor pile reinforcing steel bars is HRB400, the diameter of the anchor pile reinforcing steel bars is 18mm, the length of each unit reinforcing steel bar is 3-4 m, the upper ends of the uppermost unit reinforcing steel bars are made into horizontal sections, downward hooks are arranged at the tail ends of the horizontal sections, a plurality of hanging ribs are made, the diameter of each hanging rib is 12mm, and each hanging rib is half-shaped;
thirdly, presetting a hole opening position according to a plan, measuring and positioning holes on site, and drilling holes on the hole opening position by using an anchor rod drilling machine, wherein the drilling depth is 15m, and the diameter of an anchor pile is 250 mm;
fourthly, horizontally placing the anchor plate, vertically penetrating the three anchor pile reinforcing steel bars into through holes in the anchor plate, connecting the unit reinforcing steel bars through a connecting sleeve, fixing the anchor plate and upper-layer reinforcing steel bars in the concrete bottom plate in a spot welding manner, and enabling the horizontal section of each anchor pile reinforcing steel bar to be 100mm higher than the anchor plate;
and fifthly, cleaning before pouring, placing a guide pipe at an orifice, slowly injecting fine stone concrete into the orifice, wherein the strength of the fine stone concrete is higher than the strength grade of the concrete bottom plate, and lightly vibrating the anchor pile reinforcing steel bars in the pouring process to compact the fine stone concrete.
Laying an upper sealing layer, arranging a plurality of upper sealing layer steel bars horizontally arranged in the upper sealing layer, erecting the upper sealing layer steel bars in a plastic stirrup plum blossom shape to ensure that no displacement occurs, arranging an anchor pile hole on a concrete bottom plate, installing a lifting rib in four directions of the anchor pile hole, wherein the lifting rib is in a half 'n' shape, the straight part at the lower end of the lifting rib is bound and connected with the steel bar binding wire at the lower layer of the concrete bottom plate, and the straight part at the upper end of the lifting rib is bound and connected with the steel bar binding wire at the upper sealing layer;
the concrete on the upper surface of the concrete bottom plate is chiseled, the surface of the concrete bottom plate is cleaned, the concrete is poured to form an upper sealing layer, the thickness of the upper sealing layer is 300mm, and the concrete strength grade of the upper sealing layer is consistent with that of the anchor pile.
The invention has the advantages that:
the anchoring structure and the construction method have the advantages of simple and firm structure, reliable quality and strong occlusion force, can effectively improve the anti-floating reinforcing effect of the basement, and have high overall strength, convenient and quick construction and low construction cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1 is an anchor pile, 2 is a concrete bottom plate, 3 is a cushion layer, 4 is a cement slurry filling layer, 5 is an upper sealing layer, 6 is an anchor pile reinforcing steel bar, 7 is an anchor plate, 8 is an upper sealing layer reinforcing steel bar, 9 is a hanging bar and 10 is a connecting sleeve.
Detailed Description
The utility model provides an anchor structure after basement slope come-up resets leveling, anchor structure is "do" type anchor structure, anchor structure includes anchor pile 1, concrete bottom plate 2, bed course 3, grout is full of layer 4 and last sealing 5, 1 upper end of anchor pile and 2 fixed connection of concrete bottom plate, 2 lower extremes of concrete bottom plate are equipped with bed course 3, be equipped with grout is full of layer 4 between bed course 3 and the concrete bottom plate 2, 2 up end of concrete bottom plate are equipped with sealing 5, be equipped with three anchor pile reinforcing bars 6 in the anchor pile 1, 6 upper ends of three anchor pile reinforcing bars run through concrete bottom plate 2 and stretch into in the last sealing 5, be equipped with anchor plate 7 in the last sealing 5, anchor plate 7 covers on three anchor pile reinforcing bars 6.
As a further improvement of the technical scheme, the upper ends of the three anchor pile reinforcing steel bars 6 are provided with horizontal sections, and the tail ends of the horizontal sections are provided with downward hooks.
As a further improvement of the above technical solution, a plurality of upper seal reinforcing steel bars 8 arranged horizontally are arranged in the upper seal 5.
As a further improvement of the above technical solution, a half-u-shaped hanging rib 9 is connected between the upper seal layer 5 and the concrete bottom plate 2, the upper end of the hanging rib 9 is located in the upper seal layer 5, and the lower end of the hanging rib 9 is located in the concrete bottom plate 2.
As a further improvement of the technical scheme, the anchor pile reinforcing steel bars 6 are formed by connecting a plurality of unit reinforcing steel bars in series, the length of each unit reinforcing steel bar is smaller than the height of the basement, and adjacent unit reinforcing steel bars are connected through a connecting sleeve 10.
A construction method of an anchoring structure of a basement after inclined floating, resetting and leveling comprises the following steps:
knocking a concrete bottom plate, forming a plurality of windows at the hollow parts of the concrete bottom plate, uniformly forming a plurality of holes in the concrete bottom plate after the primary grouting is finished, laying a high-pressure grouting system, pouring high-strength cement slurry to the whole position below the concrete bottom plate, observing the elevation of a basement in the grouting process, controlling the grouting pressure within 280KPa, knocking the concrete bottom plate again, confirming that no hollow part exists, checking whether the basement is lifted and controlled within 5mm, and ensuring that the hollow part between the concrete bottom plate and a cushion layer is filled with the cement slurry within 1cm of the height difference of the basement;
secondly, embedding anchor pile reinforcing steel bars into the anchor piles, wherein the model of the anchor pile reinforcing steel bars is HRB400, the diameter of the anchor pile reinforcing steel bars is 18mm, the length of each unit reinforcing steel bar is 3-4 m, the upper ends of the uppermost unit reinforcing steel bars are made into horizontal sections, downward hooks are arranged at the tail ends of the horizontal sections, a plurality of hanging ribs are made, the diameter of each hanging rib is 12mm, and each hanging rib is half-shaped;
thirdly, presetting a hole opening position according to a plan, measuring and positioning holes on site, and drilling holes on the hole opening position by using an anchor rod drilling machine, wherein the drilling depth is 15m, and the diameter of an anchor pile is 250 mm;
fourthly, horizontally placing the anchor plate, vertically penetrating the three anchor pile reinforcing steel bars into through holes in the anchor plate, connecting the unit reinforcing steel bars through a connecting sleeve, fixing the anchor plate and upper-layer reinforcing steel bars in the concrete bottom plate in a spot welding manner, and enabling the horizontal section of each anchor pile reinforcing steel bar to be 100mm higher than the anchor plate;
and fifthly, cleaning before pouring, placing a guide pipe at an orifice, slowly injecting fine stone concrete into the orifice, wherein the strength of the fine stone concrete is higher than the strength grade of the concrete bottom plate, and lightly vibrating the anchor pile reinforcing steel bars in the pouring process to compact the fine stone concrete.
Laying an upper sealing layer, arranging a plurality of upper sealing layer steel bars horizontally arranged in the upper sealing layer, erecting the upper sealing layer steel bars in a plastic stirrup plum blossom shape to ensure that no displacement occurs, arranging an anchor pile hole on a concrete bottom plate, installing a lifting rib in four directions of the anchor pile hole, wherein the lifting rib is in a half 'n' shape, the straight part at the lower end of the lifting rib is bound and connected with the steel bar binding wire at the lower layer of the concrete bottom plate, and the straight part at the upper end of the lifting rib is bound and connected with the steel bar binding wire at the upper sealing layer;
the concrete on the upper surface of the concrete bottom plate is chiseled, the surface of the concrete bottom plate is cleaned, the concrete is poured to form an upper sealing layer, the thickness of the upper sealing layer is 300mm, and the concrete strength grade of the upper sealing layer is consistent with that of the anchor pile.
Example 1
One layer of underground of a certain project, two layers of above ground, a frame structure, a single-layer building area of about 2100 square meters, a layer height of 4.5m, a concrete beam under a column and a concrete bottom plate with the thickness of 400mm, and when the project is constructed to a main structure of one layer, the slope and the floating of a basement occur due to continuous rainstorm.
The implementation steps are as follows:
and lowering the water level, namely lowering the underground water level at light well points around the building under construction.
And (4) resetting and leveling, namely resetting and leveling the original construction project.
Knocking the bottom plate, opening a plurality of windows on the empty part position, not cutting off the reinforcing steel bars of the bottom plate, performing primary grouting on the obvious empty part position, wherein the slurry is prepared by fly ash, after primary grouting, uniformly distributing 80 holes 500mm in the bottom plate, laying a high-pressure grouting system, filling high-strength cement slurry below the bottom plate in an all-dimensional manner, observing the elevation of the basement in the grouting process, stopping grouting when sudden rising occurs, checking reasons, controlling the grouting pressure to be within 280kPa, and meanwhile, preparing loads such as uniformly laying sand bags indoors and the like in the grouting process.
And (4) checking the knocking bottom plate again, confirming that no empty and deficient part exists, checking that the basement slightly rises, controlling the height difference of the basement to be within 5mm and within 1cm, and ensuring that the empty and deficient parts of the bottom plate and the cushion layer are filled with cement paste.
Manufacturing anchor pile steel bars: the anchor pile is implanted with reinforcing steel bars, the diameter of each reinforcing steel bar is 18mm, each section of the reinforcing steel bar is not less than 3m and not more than 4m (considering the limitation of the height of a vertical layer), the last section of the reinforcing steel bar is made into a straight part and then hooked, the straight part is not less than 12d, a plurality of hanging bars are made into 12mm, the shape of the hanging bars is half 'n' shape, and a plurality of 10-direction reinforcing steel bars with the number and the diameter are made.
Forming holes: the drilling position is preset according to a plan view, the drilling is positioned by field measurement, the error is within 10mm, the drilling position is drilled by an anchor rod drilling machine, the effective drilling depth is 15m, and the diameter of an anchor pile is 250 mm.
When the jumbolter drills holes, the sleeves are synchronous, hole forming is conducted by drilling with the pipes, the air compressor high-pressure air is used for deslagging, after the designed depth is reached, drilling is continued for 1-2 minutes, field quality personnel measure the hole depth, the effective depth and grouting are ensured to be sufficient, and meanwhile, the inclination of the anchor hole is required to be smaller than 1% of the effective length.
D, tendon releasing: the triangular anchor plate is horizontally placed in advance, 3 HRB400 steel bars vertically penetrate into a triangular anchor plate hole, each section of connection is connected through a sleeve, a support and a clamp are required to stabilize the steel bars which are tightly placed during connection, the triangular anchor plate and the upper-layer steel bars of the bottom plate are fixed in a spot welding mode, and the last straight section of each vertical steel bar is 100mm higher than the triangular anchor plate.
Watering: cleaning is well carried out before pouring, reinforcing steel bar sludge is removed, a guide pipe is placed at an orifice, fine aggregate concrete is slowly injected into the orifice, the strength of the concrete is higher than that of the original bottom plate concrete by one strength grade, anchor pile reinforcing steel bars are lightly vibrated in the pouring process to compact the fine aggregate concrete, and the pouring amount of the concrete is not less than the theoretical calculation volume.
Each anchor pile is poured to the horizontal position of the lower bottom surface of the original bottom plate.
And (3) upper seal layer construction: the upper sealing layer is designed to be reinforced concrete with the thickness of 300 mm.
Laying upper sealing layer internal reinforcing steel bars, double-layer and bidirectional laying, mounting and binding, erecting the reinforcing steel bars in a plum blossom shape by using plastic stirrups, and ensuring no displacement. A hanging rib is arranged in four directions of an anchor pile hole, the straight part of the lower end of the hanging rib is bound and connected with the lower-layer steel bar binding wire of the original bottom plate, and the straight part of the upper end of the hanging rib is bound and connected with the upper-layer steel bar binding wire arranged in the upper sealing layer.
Chiseling the concrete on the upper surface of the original bottom plate, pouring seal concrete on the surface of the original bottom plate, cleaning the surface of the bottom plate, pouring the thickness of 300mm, wherein the concrete strength grade is the same as the anchor pile strength grade, the original pulp is mechanically screeded to form an integral plane, the original design basement is provided with a plain concrete leveling layer and a plain surface layer which are omitted and replaced by an upper seal layer, and the original design elevation and the use space height are basically not changed.
So far, anchor pile, filling layer, upper seal form an anchor structure system, and the system communicates each other, and is strong to basement floor structure occlusal force, and anchor pile and original soil form the friction simultaneously, avoid the come-up once more effectively.
Example 2
The construction method comprises the following steps of factory building engineering of a certain company, a frame structure, a first underground layer, six overground layers and 4.60m high layers, wherein rock and soil around a foundation pit of the basement are medium-weathered argillaceous siltstones, the water permeability is poor, when the construction is carried out to a second layer of the structure, a large amount of surface water flows into the foundation pit due to rainwater in the construction season and the force of construction measures, and the buoyancy is larger than the self weight of the basement structure and the force of an original designed uplift anchor rod and inclines.
The engineering implementation scheme is as follows: the anchor structure combining the double dry-type pile-connected anchor structure and the single dry-type pile-connected anchor structure are arranged alternately, and the difference and the same point with the case implementation 1 are introduced as follows:
the size of the open hole of the bottom plate of the pile-connected anchoring structure is 750 mm plus 500mm, the diameter of the drill hole of the anchor rod drilling machine is 250mm, the effective depth is 16m, the two holes are connected in parallel, four HRBs 400 of reinforcing steel bars are placed in the middle of each hole respectively, the diameter is 16mm, and the flat part of the reinforcing steel bar at the end part is welded with the reinforcing steel bar on the upper layer of the bottom plate in a single-sided mode or in.
The invention has the advantages of reasonable design, firm structure, reliable quality, good anti-floating reinforcing effect, strong integrity, convenient and quick construction and lower cost.
Claims (1)
1. The construction method of the anchoring structure after the basement is obliquely floated, reset and leveled is characterized in that the anchoring structure is a dry anchoring structure and comprises anchor piles, a concrete bottom plate, a cushion layer, a cement paste filling layer and an upper sealing layer, the upper ends of the anchor piles are fixedly connected with the concrete bottom plate, the lower end of the concrete bottom plate is provided with the cushion layer, the cement paste filling layer is arranged between the cushion layer and the concrete bottom plate, the upper end surface of the concrete bottom plate is provided with the upper sealing layer, three anchor pile reinforcing steel bars are arranged in the anchor piles, the upper ends of the three anchor pile reinforcing steel bars penetrate through the concrete bottom plate and extend into the upper sealing layer, anchor plates are arranged in the upper sealing layer, and the anchor plates are sleeved on the three anchor pile reinforcing steel bars;
the upper ends of the three anchor pile reinforcing steel bars are provided with horizontal sections, and the tail ends of the horizontal sections are provided with downward hooks;
a plurality of upper seal layer steel bars which are horizontally arranged are arranged in the upper seal layer;
a half-U-shaped hanging rib is connected between the upper seal layer and the concrete bottom plate, the upper end of the hanging rib is positioned in the upper seal layer, and the lower end of the hanging rib is positioned in the concrete bottom plate;
the anchor pile reinforcing steel bar is formed by connecting a plurality of unit reinforcing steel bars in series, the length of each unit reinforcing steel bar is smaller than the height of the basement, and adjacent unit reinforcing steel bars are connected through a connecting sleeve;
a construction method of an anchoring structure of a basement after inclined floating, resetting and leveling comprises the following steps:
knocking a concrete bottom plate, forming a plurality of windows at the hollow parts of the concrete bottom plate, uniformly forming a plurality of holes in the concrete bottom plate after the primary grouting is finished, laying a high-pressure grouting system, pouring high-strength cement slurry to the whole position below the concrete bottom plate, observing the elevation of a basement in the grouting process, controlling the grouting pressure within 280KPa, knocking the concrete bottom plate again, confirming that no hollow part exists, checking whether the basement is lifted and controlled within 5mm, and ensuring that the hollow part between the concrete bottom plate and a cushion layer is filled with the cement slurry within 1cm of the height difference of the basement;
secondly, embedding anchor pile reinforcing steel bars into the anchor piles, wherein the model of the anchor pile reinforcing steel bars is HRB400, the diameter of the anchor pile reinforcing steel bars is 18mm, the length of each unit reinforcing steel bar is 3-4 m, the upper ends of the uppermost unit reinforcing steel bars are made into horizontal sections, downward hooks are arranged at the tail ends of the horizontal sections, a plurality of hanging ribs are made, the diameter of each hanging rib is 12mm, and each hanging rib is half-shaped;
thirdly, presetting a hole opening position according to a plan, measuring and positioning holes on site, and drilling holes on the hole opening position by using an anchor rod drilling machine, wherein the drilling depth is 15m, and the diameter of an anchor pile is 250 mm;
fourthly, horizontally placing the anchor plate, vertically penetrating the three anchor pile reinforcing steel bars into through holes in the anchor plate, connecting the unit reinforcing steel bars through a connecting sleeve, fixing the anchor plate and upper-layer reinforcing steel bars in the concrete bottom plate in a spot welding manner, and enabling the horizontal section of each anchor pile reinforcing steel bar to be 100mm higher than the anchor plate;
fifthly, cleaning before pouring, placing a guide pipe at an orifice, slowly injecting fine stone concrete into the orifice, wherein the strength of the fine stone concrete is higher than the strength grade of a concrete bottom plate, and slightly vibrating anchor pile reinforcing steel bars in the pouring process to compact the fine stone concrete;
laying an upper sealing layer, arranging a plurality of upper sealing layer steel bars horizontally arranged in the upper sealing layer, erecting the upper sealing layer steel bars in a plastic stirrup plum blossom shape to ensure that no displacement occurs, arranging an anchor pile hole on a concrete bottom plate, mounting a hanging bar in each of four directions of the anchor pile hole, wherein the hanging bar is in a half 'n' shape, the straight part at the lower end of the hanging bar is bound and connected with a steel bar binding wire at the lower layer of the concrete bottom plate, and the straight part at the upper end of the hanging bar is bound and connected with the steel bar binding wire at the upper sealing layer;
the concrete on the upper surface of the concrete bottom plate is chiseled, the surface of the concrete bottom plate is cleaned, the concrete is poured to form an upper sealing layer, the thickness of the upper sealing layer is 300mm, and the concrete strength grade of the upper sealing layer is consistent with that of the anchor pile.
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| CN111501855A (en) * | 2020-04-27 | 2020-08-07 | 中国一冶集团有限公司 | Ground anchor anti-floating structure and construction method thereof |
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