CN113047305A - Can bear tensile foundation ditch steel shotcrete supporting construction - Google Patents
Can bear tensile foundation ditch steel shotcrete supporting construction Download PDFInfo
- Publication number
- CN113047305A CN113047305A CN202110347047.5A CN202110347047A CN113047305A CN 113047305 A CN113047305 A CN 113047305A CN 202110347047 A CN202110347047 A CN 202110347047A CN 113047305 A CN113047305 A CN 113047305A
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- Prior art keywords
- steel pipe
- steel
- foundation pit
- supporting
- support
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
Abstract
The invention discloses a foundation pit steel support supporting structure capable of bearing tensile force, which comprises connecting nodes and supporting units, wherein the two connecting nodes are respectively used for being embedded in concrete at two sides of a foundation pit, two ends of each supporting unit are respectively and fixedly connected with the two connecting nodes through fasteners, each supporting unit comprises at least one movable unit and a plurality of fixed units, the movable units are distributed in a straight line and are sequentially connected through the fasteners, each movable unit comprises a first steel pipe, a hydraulic jack, a spring lock and a second steel pipe, the hydraulic jacks are fixed in the first steel pipes, each hydraulic jack is provided with a telescopic shaft, one end of each second steel pipe is inserted into the first steel pipe, the telescopic shafts are fixedly connected with the second steel pipes, and the spring lock is positioned between the hydraulic jacks and the second steel pipes. Compared with a concrete support, the steel support supporting structure provided by the invention has the advantages that the steel support is more convenient to install and dismantle, the construction speed is higher, the construction period of the whole foundation pit is shortened, and the engineering cost is saved.
Description
Technical Field
The invention relates to the technical field of underground structural engineering, in particular to a foundation pit steel support supporting structure capable of bearing tensile force.
Background
For the construction of deep foundation pits, especially in the construction of open excavation foundation pits of subway stations, the first horizontal support is usually a reinforced concrete support. The reinforced concrete support has the advantages of large rigidity, small deformation, firm joint, capability of bearing pressure and tensile force, good overall stability and the like, but the construction process of the reinforced concrete support is more complicated, the time for waiting for strength maintenance is longer, and the later-period dismantling time is also longer. The installation of steel shotcrete, demolish more conveniently, construction speed is faster, but the relative reinforced concrete of steel shotcrete props, and rigidity is less, and the increase of warping, node junction is weaker, can only bear pressure, and overall stability is poor, and construction safety risk will increase.
Disclosure of Invention
The invention aims to provide a foundation pit steel support supporting structure capable of bearing tensile force, which is used for replacing a concrete support to become a first horizontal support, saves construction cost and shortens construction period.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a foundation pit steel support supporting structure capable of bearing tensile force, which comprises connecting nodes and supporting units, wherein the two connecting nodes are respectively used for being pre-embedded in concrete at two sides of a foundation pit, two ends of each supporting unit are respectively and fixedly connected with the two connecting nodes through fasteners, each supporting unit comprises at least one movable unit and a plurality of fixed units, the movable units are distributed linearly and are sequentially connected through the fasteners, each movable unit comprises a first steel pipe, a hydraulic jack, a spring lock and a second steel pipe, the hydraulic jack is fixed in the first steel pipe, the hydraulic jack is provided with a telescopic shaft, one end of the second steel pipe is inserted into the first steel pipe, the telescopic shaft is fixedly connected with the second steel pipe, and the spring lock is positioned between the hydraulic jack and the second steel pipe.
Preferably, the spring lock comprises a rear steel plate, a spring, a front steel plate, a sleeve, a rotating bearing, an umbrella-shaped supporting rod and a retreating pressure rod which are sequentially arranged in the first steel pipe along the axial direction, the spring, the sleeve and the rotating bearing are all sleeved outside the telescopic shaft, the rear steel plate and the front steel plate are respectively fixed with two ends of the spring, the rear steel plate is adjacent to the hydraulic jack, one end of the sleeve is fixedly connected with the front steel plate, the other end of the sleeve is fixedly connected with an inner ring of the rotating bearing, hinged supports are respectively arranged at two ends of the umbrella-shaped supporting rod and the retreating pressure rod, the hinged support at one end of the umbrella-shaped supporting rod is fixed on an outer ring of the rotating bearing, the hinged support at the other end of the umbrella-shaped supporting rod is fixed on the retreating pressure rod, and the hinged support at one end of the retreating pressure rod is fixed on, the hinged support at the other end of the retreating pressure rod is in contact limit with the inner wall of the first steel pipe, an annular groove is formed in the inner wall of the first steel pipe and comprises a conical inclined plane and a limit flange, the conical top of the conical inclined plane faces the hydraulic jack, and the hinged support at the other end of the retreating pressure rod is located in the annular groove.
Preferably, the edge of the flange close to the axis of the first steel pipe is provided with an oblique chamfer.
Preferably, the steel pipe further comprises a bolt, an insertion groove for the bolt to insert is formed in the outer wall of the second steel pipe, and a jack for the bolt to penetrate is formed in the first steel pipe.
Preferably, the edge of back steel sheet is equipped with the regulation arch, be equipped with the adjustment tank on the first steel pipe, the regulation arch outwards passes the adjustment tank and can slide in the adjustment tank, the adjustment tank including be on a parallel with the longitudinal groove of the axis of first steel pipe and with the horizontal groove of longitudinal groove perpendicular intercommunication, it is a plurality of the horizontal groove is equidistant setting.
Preferably, the connection node comprises a joint flange and embedded bolts, the embedded bolts penetrate through the joint flange and are in threaded connection with the joint flange, and the end parts of the embedded bolts are embedded in concrete on two sides of the foundation pit.
Preferably, the fixing unit comprises a plurality of standard length steel pipes and an adaptive length steel pipe.
Preferably, the length of the standard length steel pipe is 3m, the outer diameter of the first steel pipe is 800mm, and the outer diameter of the second steel pipe is 609 mm.
Compared with the prior art, the invention has the following technical effects:
compared with a concrete support, the steel support supporting structure provided by the invention has the advantages that the steel support is more convenient to install and dismantle, the construction speed is higher, the construction period of the whole foundation pit is shortened, and the engineering cost is saved. According to the invention, by designing the special movable units, the characteristic that the steel support is not compressed or pulled is solved, the steel support replaces a concrete support to become a first horizontal support, and the construction cost is saved; the invention can be suitable for foundation pits with different widths by adopting different fixing unit combination modes; according to the invention, by designing the special connecting node of the steel support and the crown beam, the reliable connection of the steel support and the crown beam is ensured, and the falling risk is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of an arrangement mode of a foundation pit steel support structure capable of bearing tensile force in the embodiment;
FIG. 2 is a schematic view of the connection relationship between the movable unit and the connection node after the insertion of the plug pin;
FIG. 3 is a schematic view showing a connection relationship between a connection node and a crown beam;
FIG. 4 is a schematic view of the movable unit in a top view;
FIG. 5 is a schematic diagram of a connection node;
FIG. 6 is a schematic view showing the connection relationship between the plug and the second steel pipe;
description of reference numerals: 100-a foundation pit steel support supporting structure capable of bearing tension; 1-a connection node; 2-a support unit; 11-a joint flange; 12-embedding bolts; 21-an active unit; 22-a stationary unit; 2101-a first steel pipe; 2102-hydraulic jacks; 2103-a second steel tube; 2104-rear steel plate; 2105-a spring; 2106-front steel plate; 2107-a sleeve; 2108-a rotational bearing; 2109-umbrella-shaped struts; 2110-retreating the pressure lever; 2111-tapered ramp; 2112-limit stop; 2113-adjusting the protrusion; 2114-adjustment tank; 2115-bolt; 2116-telescoping shaft.
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.
The invention aims to provide a foundation pit steel support supporting structure capable of bearing tensile force, which is used for replacing a concrete support to become a first horizontal support, saves construction cost and shortens construction period.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 6, the present embodiment provides a steel supporting and protecting structure 100 for an excavation pit, which can bear tensile force, and includes a connection node 1 and a support unit 2. The two connecting nodes 1 are respectively used for being embedded in concrete on two sides of the foundation pit in advance, and two ends of the supporting unit 2 are respectively fixedly connected with the two connecting nodes 1 through fasteners. The supporting unit 2 comprises at least one movable unit 21 and a plurality of fixed units 22 which are linearly distributed and sequentially connected through fasteners, and flange plates for mounting the fasteners are arranged at the end parts of the movable unit 21 and the fixed units 22. The movable unit 21 comprises a first steel pipe 2101, a hydraulic jack 2102, a spring lock and a second steel pipe 2103, wherein the hydraulic jack 2102 is fixed in the first steel pipe 2101, the hydraulic jack 2102 is provided with a telescopic shaft 2116, one end of the second steel pipe 2103 is inserted into the first steel pipe 2101, the telescopic shaft 2116 is fixedly connected with the second steel pipe 2103, and the spring lock is located between the hydraulic jack 2102 and the second steel pipe 2103.
Under the conditions that the foundation pit enclosure deviates outwards from the foundation pit, the steel support shrinks and the like, the spring lock can ensure that the movable unit 21 automatically extends, the support unit 2 and the crown beam are always ensured to be tightly connected, the support unit 2 is always in a pressed state, and the flexible adjustment of the pre-applied axial force of the support unit 2 is realized through the hydraulic jack 2102.
In this embodiment, the latch comprises a rear steel plate 2104, a spring 2105, a front steel plate 2106, a sleeve 2107, a pivot bearing 2108, an umbrella-shaped strut 2109 and a backward pressure lever 2110 which are sequentially arranged in the first steel pipe 2101 along the axial direction, and the rear steel plate 2104 is arranged adjacent to the hydraulic jack 2102. The inner ring of the rotating bearing 2108 is tightly sleeved on the telescopic shaft 2116, and the spring 2105 and the sleeve 2107 are slidably sleeved on the telescopic shaft 2116. The rear steel plate 2104 and the front steel plate 2106 are respectively fixed with two ends of the spring 2105, one end of the casing 2107 is fixedly connected with the front steel plate 2106, and the other end of the casing 2107 is fixedly connected with the inner ring of the rotating bearing 2108. Hinge supports are respectively arranged at the two ends of the umbrella-shaped supporting rod 2109 and the two ends of the backward pressing rod 2110, the hinge support at one end of the umbrella-shaped supporting rod 2109 is fixed on the outer ring of the rotating bearing 2108, the hinge support at the other end of the umbrella-shaped supporting rod 2109 is fixed on the backward pressing rod 2110, and particularly is fixed at a position between the two ends of the backward pressing rod 2110. The hinge support at one end of the backward pressure rod 2110 is fixed on the telescopic shaft 2116, and the hinge support at the other end of the backward pressure rod 2110 is in contact with the inner wall of the first steel pipe 2101 for limiting. An annular groove is formed in the inner wall of the first steel pipe 2101, and a hinge support at the other end of the backward pressing rod 2110 is located in the annular groove. The annular groove includes a tapered ramp 2111 and a retaining lip 2112, the apex of the tapered ramp 2111 facing the hydraulic jack 2102.
When the first steel pipe 2101 and the second steel pipe 2103 are close to each other, the telescopic shaft 2116 is retracted inwards until the hinged support at the other end of the backward pressure rod 2110 is in contact with the conical inclined surface 2111 for limiting; when the first steel pipe 2101 and the second steel pipe 2103 are far away from each other, the telescopic shaft 2116 extends outwards, the spring lock is pulled until the hinge support at the other end of the backward pressure rod 2110 is contacted with the limit stop edge 2112 for limiting. The safety of the supporting structure is ensured by the contact limit of the hinged support at the other end of the retreating pressure rod 2110 and the annular groove. Because the inner ring and the outer ring of the rotary bearing 2108 can rotate relatively, the second steel pipe 2103 can rotate along the axis of the second steel pipe in the embodiment, and the installation operation is convenient.
In order to avoid the collision between the limit rib 2112 and the backward pressure rod 2110, an oblique chamfer is provided at the edge of the rib close to the axis of the first steel pipe 2101 in the embodiment.
In order to enable the foundation pit steel support and support structure of this embodiment to also bear a tensile force, this embodiment further includes a latch 2115, an insertion slot for inserting the latch 2115 is provided on the outer wall of the second steel pipe 2103, and an insertion hole for passing the latch 2115 is provided on the first steel pipe 2101. After the slot is aligned with the jack, the pin 2115 is inserted into the slot, the first steel pipe 2101 and the second steel pipe 2103 are locked with each other, the support structure and the enclosure structure are in rigid connection, and the support structure can provide tension for the enclosure structure.
In order to adjust the length of the telescopic shaft 2116 and lock the telescopic shaft, in this embodiment, an adjusting protrusion 2113 is provided at the edge of the rear steel plate 2104, an adjusting slot 2114 is provided on the first steel pipe 2101, and the adjusting protrusion 2113 passes through the adjusting slot 2114 outwards and can slide in the adjusting slot 2114. The adjustment grooves 2114 include longitudinal grooves parallel to the axis of the first steel pipe 2101 and lateral grooves vertically communicating with the longitudinal grooves, and the plurality of lateral grooves are disposed at equal intervals. By changing the position of the adjustment protrusion 2113, the adjustment protrusion 2113 is positioned in different lateral grooves, and the extension length of the telescopic shaft 2116 can be adjusted correspondingly.
In this embodiment, the connection node 1 specifically includes the joint flange 11 and the embedded bolt 12, and the embedded bolt 12 passes the joint flange 11 and with joint flange 11 threaded connection, and the tip of embedded bolt 12 is pre-buried in the concrete of foundation ditch both sides. The top beams on two sides of the foundation pit are provided with anti-shearing grooves, and the joint flanges 11 and the embedded bolts 12 are placed on the anti-shearing grooves. After the steel bars of the crown beam are bound, concrete is poured together between the connecting node 1 and the steel bars of the crown beam to form a whole, and then the supporting unit 2 is installed.
In order to facilitate standardized construction, the fixing unit 22 of the present embodiment includes a plurality of standard-length steel pipes and an adaptive-length steel pipe, and the entire length of the supporting unit 2 is the width of the foundation pit. The length of the standard length steel pipe is 3m, the outer diameter of the first steel pipe 2101 is 800mm, the outer diameter of the second steel pipe 2103 is 609mm, and the specific length of the adaptive length steel pipe is flexibly selected according to a calculation result.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a can bear tensile foundation ditch steel shotcrete supporting construction, its characterized in that, includes connected node and support element, two connected node is arranged in pre-buried in the concrete of foundation ditch both sides respectively, support element's both ends respectively with two connected node passes through fastener fixed connection, support element is including being sharp distribution and through fastener consecutive at least one movable unit and a plurality of fixed unit, movable unit includes first steel pipe, hydraulic jack, latch and second steel pipe, hydraulic jack is fixed in the first steel pipe, hydraulic jack has a telescopic shaft, the one end of second steel pipe is inserted in the first steel pipe, the telescopic shaft with second steel pipe fixed connection, the latch is located hydraulic jack with between the second steel pipe.
2. The foundation pit steel supporting and protecting structure capable of bearing tensile force according to claim 1, wherein the spring lock comprises a rear steel plate, a spring, a front steel plate, a sleeve, a rolling bearing, an umbrella-shaped supporting rod and a backward pressing rod which are sequentially arranged in the first steel pipe along the axial direction, the spring, the sleeve and the rolling bearing are all sleeved outside the telescopic shaft, the rear steel plate and the front steel plate are respectively fixed with two ends of the spring, the rear steel plate is arranged adjacent to the hydraulic jack, one end of the sleeve is fixedly connected with the front steel plate, the other end of the sleeve is fixedly connected with an inner ring of the rolling bearing, hinged supports are respectively arranged at two ends of the umbrella-shaped supporting rod and the backward pressing rod, the hinged support at one end of the umbrella-shaped supporting rod is fixed on an outer ring of the rolling bearing, the hinged support at the other end of the umbrella-shaped supporting rod is fixed on the backward pressing rod, the hinge support at one end of the retreating pressure rod is fixed on the telescopic shaft, the hinge support at the other end of the retreating pressure rod is in contact with the inner wall of the first steel pipe for limiting, an annular groove is formed in the inner wall of the first steel pipe and comprises a conical inclined plane and a limiting flange, the conical top of the conical inclined plane faces the hydraulic jack, and the hinge support at the other end of the retreating pressure rod is located in the annular groove.
3. The foundation pit steel supporting and protecting structure capable of bearing tensile force of claim 2, wherein the edge of the rib close to the axis of the first steel pipe is provided with an oblique chamfer.
4. The foundation pit steel supporting and protecting structure capable of bearing tensile force of claim 2, further comprising a bolt, wherein the outer wall of the second steel pipe is provided with an insertion slot for the bolt to insert, and the first steel pipe is provided with an insertion hole for the bolt to pass through.
5. The foundation pit steel supporting and protecting structure capable of bearing tensile force of claim 2, wherein the edge of the rear steel plate is provided with an adjusting protrusion, the first steel pipe is provided with an adjusting groove, the adjusting protrusion outwards passes through the adjusting groove and can slide in the adjusting groove, the adjusting groove comprises a longitudinal groove parallel to the axis of the first steel pipe and a transverse groove vertically communicated with the longitudinal groove, and the plurality of transverse grooves are arranged at equal intervals.
6. The foundation pit steel supporting and protecting structure capable of bearing tensile force of claim 1, wherein the connection node comprises a joint flange and embedded bolts, the embedded bolts penetrate through the joint flange and are in threaded connection with the joint flange, and the end parts of the embedded bolts are embedded in concrete on two sides of a foundation pit.
7. The foundation pit steel supporting and supporting structure capable of withstanding tensile force of claim 1, wherein the fixing unit comprises a plurality of standard length steel pipes and one adaptive length steel pipe.
8. The foundation pit steel supporting and protecting structure capable of bearing tensile force of claim 7, wherein the standard length steel pipe has a length of 3m, the first steel pipe has an outer diameter of 800mm, and the second steel pipe has an outer diameter of 609 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110347047.5A CN113047305B (en) | 2021-03-31 | 2021-03-31 | Can bear tensile foundation ditch steel shotcrete supporting construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110347047.5A CN113047305B (en) | 2021-03-31 | 2021-03-31 | Can bear tensile foundation ditch steel shotcrete supporting construction |
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| CN113047305A true CN113047305A (en) | 2021-06-29 |
| CN113047305B CN113047305B (en) | 2022-05-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320329A (en) * | 2021-11-18 | 2022-04-12 | 中铁二十四局集团安徽工程有限公司 | Down-through railway frame box culvert jacking construction device and construction method thereof |
| CN114411755A (en) * | 2022-01-14 | 2022-04-29 | 中国建筑第八工程局有限公司 | Steel support axial force compensation device and construction method thereof |
| CN116122304A (en) * | 2023-03-16 | 2023-05-16 | 中国铁路广州局集团有限公司站房建设指挥部 | Deep foundation pit support changing device with adjustable supporting force |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320329A (en) * | 2021-11-18 | 2022-04-12 | 中铁二十四局集团安徽工程有限公司 | Down-through railway frame box culvert jacking construction device and construction method thereof |
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| CN116122304A (en) * | 2023-03-16 | 2023-05-16 | 中国铁路广州局集团有限公司站房建设指挥部 | Deep foundation pit support changing device with adjustable supporting force |
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| CN113047305B (en) | 2022-05-06 |
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