CN113090066A - Construction method for newly added entrances and exits of existing buildings and elevator shaft - Google Patents
Construction method for newly added entrances and exits of existing buildings and elevator shaft Download PDFInfo
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- CN113090066A CN113090066A CN202110411007.2A CN202110411007A CN113090066A CN 113090066 A CN113090066 A CN 113090066A CN 202110411007 A CN202110411007 A CN 202110411007A CN 113090066 A CN113090066 A CN 113090066A
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- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 186
- 239000010959 steel Substances 0.000 claims abstract description 186
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000009434 installation Methods 0.000 claims abstract description 11
- 239000003337 fertilizer Substances 0.000 claims abstract description 4
- 238000009412 basement excavation Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E04G23/0266—Enlarging
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/005—Lift shafts
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Abstract
A construction method for an existing building newly-added entrance and an existing building elevator shaft is characterized by comprising the following steps: s1, inserting and driving steel sheet piles: measuring and paying off outside the original support piles at the newly added entrances and exits and the positions of the elevator shafts, releasing the installation positions of the steel sheet piles, driving the steel sheet piles by using a pile driver, inserting and driving the steel sheet piles by adopting an independent driving method, and continuously driving single steel sheet piles one by one; s2, erecting a steel pipe support: erecting a plurality of steel pipe supports on two sides of the newly-increased elevator shaft for supporting steel sheet piles, wherein one section of the steel pipe support is arranged on the steel sheet piles, and the other end of the steel pipe support is arranged on the original structure of the existing building; s3, chiseling the original supporting pile: chiseling original support piles on the inner sides of the steel sheet piles to the newly added entrances and exits and the bottom of an elevator shaft platform, and backfilling the original basement fertilizer groove at the position to the bottom of the platform; s4, constructing a main structure of the newly added entrance and exit and the elevator shaft; and S5, removing the steel pipe support and removing the steel sheet pile.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method of an existing building newly added entrance and an existing building elevator shaft.
Background
In the process of urbanization, the urban density is improved and high-rise buildings are rapidly increased, the available overground space in the city is less and less, the contradiction between urban development and land resource shortage is more and more prominent, and the development and utilization of the underground space become a necessary way for the sustainable development of the urbanization. In the urbanization process, the existing building needs to be modified to meet the travel demand of residents, and an important content of modification is that an entrance and an exit and an elevator are added on the basis of a basement of the existing building so as to facilitate the travel of the residents.
In the construction process of newly adding an access and an elevator shaft to the basement of the existing building, how to form effective support for the structure of the basement of the existing building is an urgent problem to be solved.
Disclosure of Invention
The invention mainly aims to provide a construction method of a newly added entrance and exit of an existing building and an elevator shaft, and aims to solve the technical problems.
A construction method for an existing building newly-added entrance and an existing building elevator shaft is characterized by comprising the following steps:
s1, inserting and driving steel sheet piles: measuring and paying off outside the original support piles at the newly added entrances and exits and the positions of the elevator shafts, releasing the installation positions of the steel sheet piles, driving the steel sheet piles by using a pile driver, inserting and driving the steel sheet piles by adopting an independent driving method, continuously driving single steel sheet piles one by one, and continuously driving the steel sheet piles, wherein the elevation difference of pile tops is less than 10 cm;
s2, erecting a steel pipe support: erecting a plurality of steel pipe supports on two sides of the newly-added elevator shaft for supporting the steel sheet piles to avoid the deformation or inclination of the steel sheet piles, wherein one section of the steel pipe support is arranged on the steel sheet piles, and the other end of the steel pipe support is arranged on the original structure of the existing building;
s3, chiseling the original supporting pile: chiseling original support piles on the inner sides of the steel sheet piles to the newly added entrances and exits and the bottom of an elevator shaft platform, and backfilling the original basement fertilizer groove at the position to the bottom of the platform;
s4, constructing a main structure of the newly added entrance and exit and the elevator shaft;
and S5, removing the steel pipe support and removing the steel sheet pile.
Preferably, in step S1, the slope of the inserted and driven steel sheet pile is monitored in real time during the process of inserting and driving the steel sheet pile, and if the monitored slope exceeds 1.5%, the inserted and driven steel sheet pile is pulled up and driven again.
Preferably, in step S1, the steel sheet piles are three, and the heights of the steel sheet piles are 9m, 6m and 3m, and when the steel sheet piles are driven, firstly, steel sheet piles of 9m are driven, then steel sheet piles of 6m are driven, and finally steel sheet piles of 3m are driven.
Preferably, the step S2 further comprises the steps of installing a bracket and a steel purlin when the elevator shaft foundation pit is excavated to be 1-2 m below the top of the steel sheet pile; the steel pipe support erection adopts the principles of layered excavation, layered support and support following excavation; the interval between the steel pipe supports is 1.5 m; the steel pipe supports adopt DN220 x 5 steel pipe.
Furthermore, the bracket is made of L70 x 5 angle steel, the installation distance is 1.5m, the bracket is welded to the inner side of the steel sheet pile after the foundation pit is excavated to the height mark of the bracket bottom, and the bracket of the ramp side wall is fixed by bolts.
Furthermore, the steel enclosing purlin is made of I45b double-spliced I-shaped steel, the steel enclosing purlin is installed by a crane after the bracket is installed and fixed, the steel enclosing purlin is arranged along the length of the foundation pit, the joint position cannot be disconnected, and the steel plate with the diameter of 8mm is used for effective welding.
Preferably, when chiseling the original support pile in step S3, if the distance between the head and the tail of the steel sheet pile section and the original support pile system is more than or equal to 300mm, a reinforced concrete retaining wall is arranged between the original support pile and the steel sheet pile; and if the distance is less than 300mm, spraying a concrete surface layer with the thickness of 80mm between the support piles and the steel sheet piles.
Preferably, the step S3 further includes chiseling the top crown beam, the top crown beam is chiseled after the construction of the steel sheet pile and the steel pipe support is completed, and the chiseled waste broken stone is cleaned in time; when an original supporting pile is chiseled, a drill hole with the diameter of 100mm is arranged on the original supporting pile at intervals of 2 meters in the longitudinal direction and the transverse direction, and the supporting pile is chiseled from top to bottom by using an air pick.
Preferably, step S4 further includes waterproof construction and foundation pit backfilling, and the waterproof construction of the outer wall is performed on the wall structure at the newly added entrance and exit and the elevator shaft position; and backfilling is timely carried out after the concealed acceptance of the newly added entrances and exits and the main structure of the elevator shaft is qualified.
Preferably, in step S5, the steel pipe support is removed when the newly added entrance and the main structure of the elevator shaft are constructed or the strength of concrete meets the design requirement, and the foundation pit is backfilled to a position below the support; the steel sheet pile is pulled out by adopting an excavator vibration hammer to vibrate and pull out the pile, firstly pulling out 3m steel sheet piles, then pulling out 6m steel sheet piles, and finally pulling out 9m steel sheet piles; and (3) timely backfilling the pile hole left after pile pulling, wherein the backfilling method adopts a filling method, and the filling method adopts sand as a material.
The invention achieves the following beneficial effects: adopt the steel sheet pile to strut at newly-increased access & exit foundation ditch, strut at the regional foundation ditch of newly-increased elevartor shaft and adopt steel sheet pile + steel pipe to support and form dual supporting construction, can enough form good support to the steel sheet pile and avoid the steel sheet pile to warp or incline, can form good the strutting to existing building again, avoid causing the harm to the building, supporting construction is simple, is convenient for improve the efficiency of construction of newly-increased access & exit and elevartor shaft.
Drawings
FIG. 1 is a layout diagram of a newly added entrance and exit and a supporting plane of a foundation pit of an elevator shaft in the invention;
FIG. 2 is an elevation view of the newly added doorway and the elevator shaft support of the present invention;
FIG. 3 is a cross-sectional view of the newly added entrance and exit and the elevator shaft of the present invention (only steel sheet piles and steel pipe supports are constructed);
FIG. 4 is a diagram showing the position relationship between the newly added entrance and exit and the elevator shaft support and the original support structure and basement structure;
FIG. 5 is a layout diagram of steel pipe supports on two sides of the newly added elevator shaft in the invention;
FIG. 6 is a reinforced concrete retaining wall according to the present invention;
FIG. 7 shows the relative position relationship between the steel sheet pile, the steel pipe support and the basement structure;
FIG. 8 is a plan view of the staircase with the newly added doorway of the present invention;
FIG. 9 is a cross-sectional view taken along line A-A of FIG. 8;
fig. 10 is a schematic view of the installation of the steel purlin of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
A construction method for an existing building newly-added entrance and an existing building elevator shaft is characterized by comprising the following steps:
s1, inserting and driving steel sheet piles: measuring and setting out outside the original support piles at the newly added entrances and exits and the positions of the elevator shafts, releasing the installation positions of the steel sheet piles, and marking by using gray lines; the method comprises the following steps of (1) utilizing a pile driver to drive steel sheet piles, wherein the pile driver is a vibration pile driver, the steel sheet piles are driven in an independent driving method, single steel sheet piles are driven continuously one by one, and the difference of pile top elevations is less than 10cm when the steel sheet piles are driven continuously; the three steel sheet piles are 9m, 6m and 3m in height, and when the steel sheet piles are inserted and driven, firstly, 9m steel sheet piles are driven, then 6m steel sheet piles are driven, and finally 3m steel sheet piles are driven;
s2, erecting a steel pipe support: erecting a plurality of steel pipe supports on two sides of the newly-added elevator shaft for supporting the steel sheet piles to avoid the deformation or inclination of the steel sheet piles, wherein one section of the steel pipe support is arranged on the steel sheet piles, and the other end of the steel pipe support is arranged on the original structure of the existing building;
s3, chiseling the original supporting pile: chiseling an original support pile on the inner side of the steel sheet pile to the newly added entrance and exit and the bottom of an elevator shaft platform by using an air pick, and backfilling an original basement fertilizer groove at the position to the bottom of the platform;
s4, constructing a main structure of the newly added entrance and exit and the elevator shaft;
and S5, removing the steel pipe support and removing the steel sheet pile.
In this embodiment, prior preparation works such as leveling the field and connecting the hydropower are performed before the existing building newly-added entrance and elevator shaft construction is performed. In the construction stage of the basement of the existing building, construction joints are reserved at the positions of the newly added entrances and exits and the elevator shaft, namely the positions of the negative deck and the top plate of the basement.
In this embodiment, when the original support piles are measured and set out at the newly added entrance and the position of the elevator shaft in step S1, in order to avoid the collision between the original support piles and the steel sheet piles, the position of the steel sheet piles is spaced from the position of the original support piles by at least 1 meter.
In this embodiment, the inclination of the inserted and driven steel sheet pile is monitored in real time during the process of inserting and driving the steel sheet pile, and if the monitored inclination exceeds 1.5%, the inserted and driven steel sheet pile is pulled up and driven. In step S1, when inserting the steel sheet pile, the pile driver is used to clamp the steel sheet pile and lift the steel sheet pile to the position above the gray line marked during line defense and to align the steel sheet pile to the right direction, and then the front end of the previous steel sheet pile is aligned to the gray line and inserted into the soil body, the second steel sheet pile driven into the soil will follow up naturally, and the first steel sheet pile should be about 1 meter higher than the ground.
In this embodiment, the step S2 further includes installing a bracket and a steel purlin when the elevator shaft foundation pit is excavated to 1m to 2m below the top of the steel sheet pile; the steel pipe support erection adopts the principles of layered excavation, layered support and support following excavation; the interval between the steel pipe supports is 1.5 m; the steel pipe supports adopt DN220 x 5 steel pipe. The bracket adopts L70 x 5 angle steel preparation, and the erection space is 1.5m, and it is inboard with bracket welding to the steel sheet pile after the elevation at the bottom of the foundation ditch excavation to the bracket, the bracket of ramp side wall adopts the bolt fastening. The steel encloses the purlin and adopts I45b double-pin I-steel preparation, adopts crane installation steel to enclose the purlin after the bracket installation is fixed, and the steel encloses the purlin and arranges along foundation ditch logical length, and the joint position must not break off, effectively welds with 8mm steel sheet. In this embodiment, in step S2, one end of the steel pipe support is fixed against the steel purlin, and the other end is driven into the locking piece to force the two ends of the steel pipe support.
In this embodiment, when chiseling out the original support pile in step S3, if the distance between the head and the tail of the steel sheet pile section and the original support pile system is greater than or equal to 300mm, a reinforced concrete retaining wall is arranged between the original support pile and the steel sheet pile; and if the distance is less than 300mm, spraying a concrete surface layer with the thickness of 80mm between the support piles and the steel sheet piles.
In this embodiment, the step S3 further includes chiseling the top crown beam, the top crown beam is chiseled after the construction of the steel sheet pile and the steel pipe support is completed, and the chiseled waste broken stone is cleaned in time; when an original supporting pile is chiseled, a drill hole with the diameter of 100mm is arranged on the original supporting pile at intervals of 2 meters in the longitudinal direction and the transverse direction, and the supporting pile is chiseled from top to bottom by using an air pick. In step S3, the earthwork to be transported is the waste concrete fragments after the original supporting piles and the crown beams are broken, and the waste concrete fragments can be excavated by adopting a vertical earth-taking method of a side long-arm excavator, so as to ensure the stability of the longitudinal slope during excavation.
In this embodiment, step S4 further includes waterproof construction and foundation pit backfilling, and the waterproof construction of the outer wall is performed on the wall structure at the newly added entrance and exit and the elevator shaft position; the newly-added access & exit and elevator shaft major structure are concealed and qualified and then are backfilled in time so as to avoid collapse caused by too long-time drying of the groove or difficulty in backfilling operation caused by easy generation of a soaking groove in rainy seasons. Meanwhile, in order to ensure the quality of the backfill soil, a soil test is carried out on site so as to conveniently master the water content and the compaction degree of the backfill soil at any time.
In this embodiment, in step S5, after the newly added entrance and the main structure of the elevator shaft are constructed or the strength of the concrete reaches the design requirement, the foundation pit is backfilled under the support, the locking piece is removed, and then the steel pipe support is removed. During dismantling, the steel pipe support to be dismantled is suspended by the lifting hook, bolts are loosened manually or welding line connection is cut off by oxygen acetylene, and then the steel pipe supported by the section of steel pipe is directly dispatched out of the foundation pit. The steel sheet pile is pulled out by adopting an excavator vibration hammer to vibrate and pull the pile, and the vibration pile pulling is realized by applying vibration force to the steel sheet pile by using the vibration hammer to disturb soil, destroy the frictional resistance and the adsorption force between the soil and the steel sheet pile and apply lifting force to pull out the steel sheet pile. In this embodiment, the 3m steel sheet pile is pulled out, then the 6m steel sheet pile is pulled out, and finally the 9m steel sheet pile is pulled out; when the pile is pulled out, the load condition of the pile pulling machine is noticed, the steel sheet pile which is difficult to pull out is firstly vibrated by the vibration hammer for 100-300 mm, and then is alternately vibrated and pulled out with the vibration hammer, so that the steel sheet pile can be pulled out repeatedly. And (3) timely backfilling the pile hole left after pile pulling, wherein the backfilling method adopts a filling method, and the filling method adopts sand as a material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A construction method for an existing building newly-added entrance and an existing building elevator shaft is characterized by comprising the following steps:
s1, inserting and driving steel sheet piles: measuring and paying off outside the original support piles at the newly added entrances and exits and the positions of the elevator shafts, releasing the installation positions of the steel sheet piles, driving the steel sheet piles by using a pile driver, inserting and driving the steel sheet piles by adopting an independent driving method, continuously driving single steel sheet piles one by one, and continuously driving the steel sheet piles, wherein the elevation difference of pile tops is less than 10 cm;
s2, erecting a steel pipe support: erecting a plurality of steel pipe supports on two sides of the newly-increased elevator shaft for supporting steel sheet piles, wherein one section of the steel pipe support is arranged on the steel sheet piles, and the other end of the steel pipe support is arranged on the original structure of the existing building;
s3, chiseling the original supporting pile: chiseling original support piles on the inner sides of the steel sheet piles to the newly added entrances and exits and the bottom of an elevator shaft platform, and backfilling the original basement fertilizer groove at the position to the bottom of the platform;
s4, constructing a main structure of the newly added entrance and exit and the elevator shaft;
and S5, removing the steel pipe support and removing the steel sheet pile.
2. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: in step S1, the slope of the inserted and driven steel sheet pile is monitored in real time during the process of inserting and driving the steel sheet pile, and if the monitored slope exceeds 1.5%, the inserted and driven steel sheet pile is pulled up and driven again.
3. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: in step S1, the three steel sheet piles are 9m, 6m and 3m in height, and when the steel sheet piles are inserted and driven, the steel sheet piles of 9m are driven first, then the steel sheet piles of 6m are driven, and finally the steel sheet piles of 3m are driven.
4. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: step S2, installing a bracket and a steel purlin when the elevator shaft foundation pit is excavated to be 1-2 m below the top of the steel sheet pile; the steel pipe support erection adopts the principles of layered excavation, layered support and support following excavation; the interval between the steel pipe supports is 1.5 m; the steel pipe supports adopt DN220 x 5 steel pipe.
5. The method as claimed in claim 4, wherein the bracket is made of L70 x 5 angle steel with an installation space of 1.5m, the bracket is welded to the inner side of the steel sheet pile after the foundation pit is excavated to the height of the bracket bottom, and the bracket of the side wall of the ramp is fixed by bolts.
6. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 4, wherein: the steel encloses the purlin and adopts I45b double-pin I-steel preparation, adopts crane installation steel to enclose the purlin after the bracket installation is fixed, and the steel encloses the purlin and arranges along foundation ditch logical length, and the joint position must not break off, effectively welds with 8mm steel sheet.
7. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: when chiseling the original support pile in the step S3, if the distance between the head and the tail of the steel sheet pile section and the original support pile system is more than or equal to 300mm, arranging a reinforced concrete retaining wall between the original support pile and the steel sheet pile; and if the distance is less than 300mm, spraying a concrete surface layer with the thickness of 80mm between the support piles and the steel sheet piles.
8. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: the step S3 also comprises chiseling the top crown beam, wherein the top crown beam is chiseled after the construction of the steel sheet pile and the steel pipe support is finished, and the chiseled waste broken stones are cleaned in time; when an original supporting pile is chiseled, a drill hole with the diameter of 100mm is arranged on the original supporting pile at intervals of 2 meters in the longitudinal direction and the transverse direction, and the supporting pile is chiseled from top to bottom by using an air pick.
9. The method for constructing an existing building with a newly added entrance and an elevator shaft as claimed in claim 1, wherein: step S4, waterproof construction and foundation pit backfilling are further included, and outer wall waterproof construction is conducted on the wall structures at the newly added entrances and exits and the elevator shaft positions; and backfilling is timely carried out after the concealed acceptance of the newly added entrances and exits and the main structure of the elevator shaft is qualified.
10. A method of constructing an existing building with added entrances and exits and elevator shafts as claimed in claim 3, wherein: in step S5, the steel pipe support is removed when the construction of the newly added entrance and the main structure of the elevator shaft is completed or the strength of concrete reaches the design requirement, and the foundation pit is backfilled to be below the support; the steel sheet pile is pulled out by adopting an excavator vibration hammer to vibrate and pull out the pile, firstly pulling out 3m steel sheet piles, then pulling out 6m steel sheet piles, and finally pulling out 9m steel sheet piles; and (3) timely backfilling the pile hole left after pile pulling, wherein the backfilling method adopts a filling method, and the filling method adopts sand as a material.
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| CN202110411007.2A CN113090066A (en) | 2021-04-16 | 2021-04-16 | Construction method for newly added entrances and exits of existing buildings and elevator shaft |
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| CN202110411007.2A CN113090066A (en) | 2021-04-16 | 2021-04-16 | Construction method for newly added entrances and exits of existing buildings and elevator shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404871A (en) * | 2022-10-11 | 2022-11-29 | 中建八局第一建设有限公司 | Construction method for connecting existing underground structure in close proximity of deep foundation pit |
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| CN102720201A (en) * | 2012-07-02 | 2012-10-10 | 中建三局第二建设工程有限责任公司 | Support change construction building method implemented by using main structure of building |
| CN203080536U (en) * | 2013-02-01 | 2013-07-24 | 上海勘测设计研究院 | Foundation pit guard structure |
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| CN204982912U (en) * | 2015-10-10 | 2016-01-20 | 中铁隧道勘测设计院有限公司 | Horizontal envelope of rock texture layer subway access & exit segmentation shaped steel |
| CN109024610A (en) * | 2018-08-01 | 2018-12-18 | 中铁十局集团第五工程有限公司 | A kind of steel sheet pile purlin support system and the foundation ditch construction method using the support system |
| CN108978680A (en) * | 2018-08-22 | 2018-12-11 | 中天建设集团有限公司 | A kind of muck soil elevator foundation pit supporting construction device and method |
| CN110528531A (en) * | 2019-07-31 | 2019-12-03 | 浙江杭海城际铁路有限公司 | A method of it utilizes and does close to foundation pit enclosure stake to excavation pit fender post |
| CN110616719A (en) * | 2019-08-22 | 2019-12-27 | 中铁三局集团有限公司 | Quick construction method for U-shaped groove of upper-span existing culvert |
| CN111608186A (en) * | 2020-04-14 | 2020-09-01 | 中国建筑第二工程局有限公司 | Construction method for inner support of pit-in-pit section steel of super high-rise pit |
| CN112096109A (en) * | 2020-08-27 | 2020-12-18 | 中国二十冶集团有限公司 | Construction method for newly built building reserved beside building |
| CN112576056A (en) * | 2020-12-07 | 2021-03-30 | 北京中岩大地科技股份有限公司 | Underpinning support system for storey-adding reconstruction of existing building basement and construction method thereof |
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| CN115404871A (en) * | 2022-10-11 | 2022-11-29 | 中建八局第一建设有限公司 | Construction method for connecting existing underground structure in close proximity of deep foundation pit |
| CN115404871B (en) * | 2022-10-11 | 2023-07-25 | 中建八局第一建设有限公司 | Construction method for connecting existing underground structure of deep foundation pit |
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