CN114319380A - Construction method for deformation of inner support column of deep foundation pit - Google Patents
Construction method for deformation of inner support column of deep foundation pit Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
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- 238000000034 method Methods 0.000 claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims description 30
- 239000002689 soil Substances 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
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- 239000000463 material Substances 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
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- 230000008520 organization Effects 0.000 claims description 2
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- 230000007547 defect Effects 0.000 description 1
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Abstract
The invention discloses a construction method for deformation of an inner support column of a deep foundation pit; belongs to the technical field of building construction; the method is characterized by comprising three major steps, wherein the second step comprises five minor steps, and the method accelerates the pouring of the cushion layer and the reinforcement of the steel upright column through early-stage trend analysis, can effectively enhance the overall stability of the foundation pit, and prevents the foundation pit from continuously deforming. The method can effectively avoid foundation pit collapse through a series of measures, protects the driving and the navigation for the overall safety, progress and cost target of the project, plays a role of reference guidance for the construction of the subsequent project through the method for reinforcing the steel upright column, takes corresponding reinforcing measures for deformation of the inner support steel upright column, and simultaneously takes different measures according to the situation, thereby realizing the fine control of the project and effectively saving the overall cost and the construction period of the project.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a construction method for deformation of an inner support column of a deep foundation pit.
Background
Along with the overall demand of the public on buildings in recent years, various high-rise buildings are pulled out, and a deep foundation pit with a multi-layer basement is accompanied. As is well known, a foundation pit is a stage with the highest safety risk and the longest occupied time in the whole construction stage, and once the deep foundation pit gives an alarm and deforms, the deep foundation pit can cause huge influences on project construction period and cost, the project construction period and the cost are often difficult to process through a simple mode, and multiple measures are generally required to be taken to prevent the foundation pit from continuously deforming, so that the safety of the foundation pit is guaranteed.
The existing technical scheme is always aimed at the overall deformation of a foundation pit, the deformation of the foundation pit is relieved through modes such as earth piling back pressure and construction sequence adjustment, a processing method for the deformation of the stand column during the support of the inner support is lacked, the deep foundation pit is supported in an inner support mode, the steel stand column of the foundation pit also generates a deformation effect during the deformation of the foundation pit, if the deformation stand column is processed improperly, the local stress of the inner support is unbalanced, the deformation risk of the foundation pit is further aggravated, and in addition, the potential safety hazard also exists in the peripheral range of the deformation stand column during the follow-up inner support dismantling process. Therefore, it is necessary to provide a construction method for supporting column deformation in a deep foundation pit to solve the above problems.
Disclosure of Invention
The invention aims to provide a construction method for deformation of an inner support column in a deep foundation pit, aiming at the defects of the prior art.
The technical scheme of the invention is realized as follows: a construction method for deformation of an inner support column in a deep foundation pit comprises the following steps:
the method comprises the following steps: and (3) analyzing deformation trends of the foundation pit and the steel upright column:
according to the conditions of inspection and monitoring of a foundation pit, the slope protection on the north side of the foundation pit is seriously cracked, the end parts of a support beam, a connecting beam and a crown beam in the areas from CX6 to CX8 on the north side are provided with through cracks, the development trend of the cracks is developed from top to bottom, the primary analysis is caused by the pulling cracks, the main reasons of deformation of the foundation pit are that the site except the north side of the foundation pit is not subjected to foundation treatment and the influence of a flood discharge channel on the east side of the foundation pit, so that the water and soil pressure on the north side and the east side is higher, the foundation pit is biased from the northeast to the southwest, the whole foundation pit deviates to the south side and the west side, pile bodies on the north side and the east side form larger lateral displacement at the position of 10m to 15m, construction excavation is performed from east to west, the synergistic effect is formed by the lateral pressure on the north side of the foundation pit, and the factors of over-surface earthwork excavation is too fast, so that the support beam is unevenly stressed and deformed, sunk and cracked;
step two: the treatment measures are as follows:
A. and (3) strengthening foundation pit monitoring:
increasing monitoring point positions and monitoring frequency, simultaneously requiring a construction unit to carry out self-monitoring, and continuously managing the deformation condition of the foundation pit by an organization worker for 24 hours;
B. forbidding stacking on the top of the slope:
the road in the foundation pit deformation area prohibits earthwork vehicles and heavy-duty truck vehicles from passing through, the heavy objects are heavily piled around the foundation pit, and all dynamic load operation around the foundation pit is stopped;
C. drainage and reinforcement measures at the bottom of the foundation pit:
for foundation pit water leakage, a construction scheme combining blocking removal is adopted: rapidly reducing the range of the foundation pit by using a special water-stopping material when the water leakage phenomenon occurs, then burying the pipe for drainage, then performing grouting plugging, simultaneously adding a proper amount of water glass into cement paste, locally cracking the foundation pit slope protection, repairing the cracks by using cement mortar, and repairing the collapsed part after filling with stone powder;
D. and (3) adding upright post measures to the ring beam:
when the upright column is inclined, measures for increasing the supporting columns are taken;
E. soil piling and back pressure:
if the foundation pit monitoring data show that the foundation pit deformation rate is further increased, the foundation pit deformation condition is not effectively improved by adopting the measures, the foundation pit has instability danger, and the foundation pit is subjected to pile-loading back pressure immediately: firstly stopping excavating earthwork, then backfilling soil reserved on the north side of the field into the pit through a reserved foundation pit channel, carrying out foundation pit safety assessment again through experts, issuing further treatment measures and determining a primary pile soil back pressure scheme;
step three: and (3) adjusting the construction sequence:
and (3) finishing the construction of the adjacent bottom plates in the deformation area as soon as possible, pouring the bottom plate concrete to the edge of the support pile to form a support top, and finally constructing the bottom plate in the area with larger deformation.
In the construction method for deformation of the inner support column in the deep foundation pit, in the step of monitoring the reinforced foundation pit, three points are respectively added on the north side ring beam and the support beam to monitor horizontal and vertical displacement of the support structure, monitoring data are formed every day, and the deformation trend of the foundation pit is analyzed in real time by combining with third-party monitoring data.
In the construction method for deformation of the support column in the deep foundation pit, in the step of drainage and reinforcement measures at the bottom of the foundation pit, the drainage ditch at the bottom of the foundation pit is too close to the support pile, so that the construction method is unfavorable for the foundation pit, the construction progress needs to be accelerated, and the concrete cushion is quickly poured.
In the construction method for deformation of the support column in the deep foundation pit, in the step of drainage and reinforcement measures at the bottom of the foundation pit, the drainage ditch at the root of the support column pile is soft in soil quality, 300mm thick C30 concrete is adopted for replacement and filling of a soft soil foundation, and a phi 16@250X250 steel mesh is internally matched.
In the construction method for deformation of the support column in the deep foundation pit, in the step of drainage and reinforcement measures at the bottom of the foundation pit, a beam is added at the positions of the support piles and the engineering piles to temporarily balance the lateral pressure at the bottom of the foundation pit.
In the construction method for deformation of the support column in the deep foundation pit, in the step of adding the column measure to the ring beam, the foundation pit monitors and displays the horizontal displacement accumulated value and the change over-early warning value of the ring beam part, the foundation pit is patrolled every hour by considering that the part is a weak link of the foundation pit, the crack conditions of the ring beam and the support beam are observed, and whether new cracks are added or not is monitored.
In the above construction method for deformation of the support column in the deep foundation pit, in the step of adding the column measure to the ring beam, the specific implementation steps of the measure are as follows: and the engineering pile at the bottom of the ring beam is used as a fulcrum, and the simple support is made of the section steel with the width of 600mm and the thickness of 10mm and props against the ring beam.
In the construction method for deformation of the inner support column in the deep foundation pit, in the step of adjusting the construction sequence, the foundation pit in the area with larger deformation needs to be constructed after a foundation pit supporting engineering design unit issues a pit-in-pit supporting drawing, and meanwhile, the construction needs to be carried out quickly after the foundation pit is deformed stably.
The invention has the technical effects and advantages that:
1. the method can effectively avoid foundation pit collapse through a series of measures, and protects the driving for the overall safety, progress and cost target of the project;
2. according to the method, the cushion layer pouring and the steel upright post are accelerated through the early-stage trend analysis, so that the overall stability of the foundation pit can be effectively enhanced, and the foundation pit is prevented from continuously deforming;
3. the invention provides a method for reinforcing the steel upright post, which plays a role of reference and guidance for the construction of subsequent projects;
4. according to the invention, corresponding reinforcement measures are taken for deformation of the inner support steel upright column, and different measures are taken according to conditions, so that the project is finely controlled, and the overall cost and the construction period of the project are effectively saved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a construction method for deformation of an inner support column of a deep foundation pit, which comprises the following steps:
the method comprises the following steps: and (3) analyzing deformation trends of the foundation pit and the steel upright column:
according to the conditions of inspection and monitoring of a foundation pit, the slope protection on the north side of the foundation pit is seriously cracked, the end parts of a support beam, a connecting beam and a crown beam in the areas from CX6 to CX8 on the north side are provided with through cracks, the development trend of the cracks is developed from top to bottom, the primary analysis is caused by the pulling cracks, the main reasons of deformation of the foundation pit are that the site except the north side of the foundation pit is not subjected to foundation treatment and the influence of a flood discharge channel on the east side of the foundation pit, so that the water and soil pressure on the north side and the east side is higher, the foundation pit is biased from the northeast to the southwest, the whole foundation pit deviates to the south side and the west side, pile bodies on the north side and the east side form larger lateral displacement at the position of 10m to 15m, construction excavation is performed from east to west, the synergistic effect is formed by the lateral pressure on the north side of the foundation pit, and the factors of over-surface earthwork excavation is too fast, so that the support beam is unevenly stressed and deformed, sunk and cracked;
step two: the treatment measures are as follows:
A. and (3) strengthening foundation pit monitoring:
increasing monitoring point positions and monitoring frequency, simultaneously requiring a construction unit to carry out self-monitoring, and continuously carrying out patrol on the deformation condition of the foundation pit by an organizer for 24 hours, wherein three points are respectively added on the north side ring beam and the support beam to carry out horizontal and vertical displacement monitoring on the support structure, monitoring data are formed every day, and the deformation trend of the foundation pit is analyzed in real time by combining with third party monitoring data;
B. forbidding stacking on the top of the slope:
the road in the foundation pit deformation area prohibits earthwork vehicles and heavy-duty truck vehicles from passing through, the heavy objects are heavily piled around the foundation pit, and all dynamic load operation around the foundation pit is stopped;
C. drainage and reinforcement measures at the bottom of the foundation pit:
for foundation pit water leakage, a construction scheme combining blocking removal is adopted: the method comprises the following steps of rapidly narrowing the range of a foundation pit by using a special water-stopping material when the water leakage phenomenon occurs, then burying a pipe for drainage, then performing grouting plugging, simultaneously adding a proper amount of water glass into cement paste, locally cracking the foundation pit slope, repairing cracks by using cement mortar, and repairing a collapsed part after filling stone powder, wherein a drainage ditch at the bottom of the foundation pit is too close to a support pile, the construction progress is required to be accelerated when the foundation pit is unfavorable, a concrete cushion is rapidly poured, the drainage ditch at the root part of a strut pile is soft in soil quality, a soft foundation is replaced and filled by C30 concrete with the thickness of 300mm, a phi 16@250X250 reinforcing mesh is internally matched, and a beam is additionally arranged at the positions of the support pile and an engineering pile to temporarily balance the lateral pressure at the bottom of the foundation pit;
D. and (3) adding upright post measures to the ring beam:
when the stand takes place to incline, takes the measure that increases the support column, and the foundation ditch monitoring shows ring beam position horizontal displacement aggregate value and change and surpasss the early warning value, considers that this position is the weak link of foundation ditch, and the foundation ditch is tourd once every hour, observes ring beam and a supporting beam's crack condition, and the monitoring has newly increased the crack, and the concrete implementation step of measure is: taking an engineering pile at the bottom of the ring beam as a fulcrum, and manufacturing a simple support by using section steel with the width of 600mm and the thickness of 10mm to prop against the ring beam;
E. soil piling and back pressure:
if the foundation pit monitoring data show that the foundation pit deformation rate is further increased, the foundation pit deformation condition is not effectively improved by adopting the measures, the foundation pit has instability danger, and the foundation pit is subjected to pile-loading back pressure immediately: firstly stopping excavating earthwork, then backfilling soil reserved on the north side of the field into the pit through a reserved foundation pit channel, carrying out foundation pit safety assessment again through experts, issuing further treatment measures and determining a primary pile soil back pressure scheme;
step three: and (3) adjusting the construction sequence:
and (3) finishing the construction of adjacent bottom plates in a deformation area as soon as possible, pouring bottom plate concrete to the side of the support pile to form a support top, constructing the bottom plate in the area with larger deformation finally, constructing the foundation pit in the area with larger deformation after a foundation pit support engineering design unit provides a pit-in-pit support drawing, and constructing quickly after the foundation pit is required to be deformed stably.
Furthermore, the foundation pit collapse can be effectively avoided through a series of measures, the whole safety, progress and cost target of the project is protected, the cushion layer pouring is accelerated and the steel upright columns are reinforced through early-stage trend analysis, the integral stability of the foundation pit can be effectively enhanced, the foundation pit is prevented from being continuously deformed, the steel upright column reinforcing method is provided, the follow-up project construction is guided by reference, corresponding reinforcing measures are taken for the deformation of the inner support steel upright columns, different measures are taken according to conditions, the project is finely controlled, and the integral cost and the construction period of the project are effectively saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A construction method for deformation of an inner support column in a deep foundation pit is characterized by comprising the following steps:
the method comprises the following steps: and (3) analyzing deformation trends of the foundation pit and the steel upright column:
according to the conditions of inspection and monitoring of a foundation pit, the slope protection on the north side of the foundation pit is seriously cracked, the end parts of a support beam, a connecting beam and a crown beam in the areas from CX6 to CX8 on the north side are provided with through cracks, the development trend of the cracks is developed from top to bottom, the primary analysis is caused by the pulling cracks, the main reasons of deformation of the foundation pit are that the site except the north side of the foundation pit is not subjected to foundation treatment and the influence of a flood discharge channel on the east side of the foundation pit, so that the water and soil pressure on the north side and the east side is higher, the foundation pit is biased from the northeast to the southwest, the whole foundation pit deviates to the south side and the west side, pile bodies on the north side and the east side form larger lateral displacement at the position of 10m to 15m, construction excavation is performed from east to west, the synergistic effect is formed by the lateral pressure on the north side of the foundation pit, and the factors of over-surface earthwork excavation is too fast, so that the support beam is unevenly stressed and deformed, sunk and cracked;
step two: the treatment measures are as follows:
A. and (3) strengthening foundation pit monitoring:
increasing monitoring point positions and monitoring frequency, simultaneously requiring a construction unit to carry out self-monitoring, and continuously managing the deformation condition of the foundation pit by an organization worker for 24 hours;
B. forbidding stacking on the top of the slope:
the road in the foundation pit deformation area prohibits earthwork vehicles and heavy-duty truck vehicles from passing through, the heavy objects are heavily piled around the foundation pit, and all dynamic load operation around the foundation pit is stopped;
C. drainage and reinforcement measures at the bottom of the foundation pit:
for foundation pit water leakage, a construction scheme combining blocking removal is adopted: rapidly reducing the range of the foundation pit by using a special water-stopping material when the water leakage phenomenon occurs, then burying the pipe for drainage, then performing grouting plugging, simultaneously adding a proper amount of water glass into cement paste, locally cracking the foundation pit slope protection, repairing the cracks by using cement mortar, and repairing the collapsed part after filling with stone powder;
D. and (3) adding upright post measures to the ring beam:
when the upright column is inclined, measures for increasing the supporting columns are taken;
E. soil piling and back pressure:
if the foundation pit monitoring data show that the foundation pit deformation rate is further increased, the foundation pit deformation condition is not effectively improved by adopting the measures, the foundation pit has instability danger, and the foundation pit is subjected to pile-loading back pressure immediately: firstly stopping excavating earthwork, then backfilling soil reserved on the north side of the field into the pit through a reserved foundation pit channel, carrying out foundation pit safety assessment again through experts, issuing further treatment measures and determining a primary pile soil back pressure scheme;
step three: and (3) adjusting the construction sequence:
and (3) finishing the construction of the adjacent bottom plates in the deformation area as soon as possible, pouring the bottom plate concrete to the edge of the support pile to form a support top, and finally constructing the bottom plate in the area with larger deformation.
2. The construction method for supporting column deformation in a deep foundation pit according to claim 1, wherein in the step of monitoring the reinforced foundation pit, three points are added on the north side ring beam and the support beam respectively for monitoring the horizontal displacement and the vertical displacement of the support structure, monitoring data are formed every day, and the deformation trend of the foundation pit is analyzed in real time by combining with third party monitoring data.
3. The construction method for deforming the support columns in the deep foundation pit according to claim 1, wherein in the step of draining and reinforcing the foundation pit bottom, the drainage ditch at the bottom of the foundation pit is too close to the support piles, so that the foundation pit is unfavorable, the construction progress needs to be accelerated, and a concrete cushion needs to be poured quickly.
4. The construction method for the deformation of the support column in the deep foundation pit according to claim 1, wherein in the step of drainage and reinforcement measures at the bottom of the foundation pit, the drainage ditch at the root of the support column pile is soft in soil quality, 300mm thick C30 concrete is adopted for filling the soft foundation, and a phi 16@250X250 steel mesh is internally matched.
5. The method as claimed in claim 1, wherein the step of draining water from the bottom of the foundation pit and reinforcing is performed by adding a beam at the position of the support piles and the engineering piles to temporarily balance the lateral pressure at the bottom of the foundation pit.
6. The construction method for supporting column deformation in a deep foundation pit according to claim 1, wherein in the step of adding column measures to the ring beam, the foundation pit is monitored and displayed to show the horizontal displacement accumulated value and the change exceeding the early warning value of the ring beam part, and considering that the part is a weak link of the foundation pit, the foundation pit is patrolled once every hour, the crack conditions of the ring beam and the supporting beam are observed, and whether new cracks are added or not is monitored.
7. The construction method for the deformation of the support column in the deep foundation pit according to claim 1, wherein in the step of adding the column measure to the ring beam, the measure is implemented by the following steps: and the engineering pile at the bottom of the ring beam is used as a fulcrum, and the simple support is made of the section steel with the width of 600mm and the thickness of 10mm and props against the ring beam.
8. The construction method for supporting column deformation in a deep foundation pit according to claim 1, wherein in the step of adjusting the construction sequence, the foundation pit in the area with larger deformation needs to be constructed after a foundation pit supporting engineering design unit provides a pit-in-pit supporting drawing, and meanwhile, the construction needs to be carried out quickly after the foundation pit is stably deformed.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4778310A (en) * | 1986-11-14 | 1988-10-18 | Mpc Containment Systems, Ltd. | Means for installing membranes in containment pits for tanks storing liquids |
| RU2254417C1 (en) * | 2003-12-15 | 2005-06-20 | Басиев Асхар Николаевич | Method and anchor system for securing pit bordering |
| CN109024612A (en) * | 2017-09-15 | 2018-12-18 | 叶长青 | Large span foundation pit support construction technology |
| CN110735434A (en) * | 2019-10-16 | 2020-01-31 | 中国建筑一局(集团)有限公司 | Construction method for replacing traditional inner support by underground force transmission belt in long and narrow deep foundation pits |
| CN113502828A (en) * | 2021-07-23 | 2021-10-15 | 上海宝冶集团有限公司 | Processing method for early warning of deep foundation pit |
-
2021
- 2021-12-30 CN CN202111680615.XA patent/CN114319380A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4778310A (en) * | 1986-11-14 | 1988-10-18 | Mpc Containment Systems, Ltd. | Means for installing membranes in containment pits for tanks storing liquids |
| RU2254417C1 (en) * | 2003-12-15 | 2005-06-20 | Басиев Асхар Николаевич | Method and anchor system for securing pit bordering |
| CN109024612A (en) * | 2017-09-15 | 2018-12-18 | 叶长青 | Large span foundation pit support construction technology |
| CN110735434A (en) * | 2019-10-16 | 2020-01-31 | 中国建筑一局(集团)有限公司 | Construction method for replacing traditional inner support by underground force transmission belt in long and narrow deep foundation pits |
| CN113502828A (en) * | 2021-07-23 | 2021-10-15 | 上海宝冶集团有限公司 | Processing method for early warning of deep foundation pit |
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Application publication date: 20220412 |