CN113529746A - Recyclable prestress supporting system and construction method - Google Patents
Recyclable prestress supporting system and construction method Download PDFInfo
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- CN113529746A CN113529746A CN202110986047.XA CN202110986047A CN113529746A CN 113529746 A CN113529746 A CN 113529746A CN 202110986047 A CN202110986047 A CN 202110986047A CN 113529746 A CN113529746 A CN 113529746A
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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
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Abstract
The invention discloses a recyclable prestress supporting system and a construction method, and relates to the technical field of foundation pit engineering. The recyclable prestressed supporting system comprises two rows of building envelopes, two crown beams and a bridge type prestressed supporting system. Two rows of building enclosures are arranged on two sides of the foundation pit at intervals, each row of building enclosures comprises a plurality of sequentially meshed recyclable support piles, and a first pre-stress structure is arranged in each recyclable support pile. A plurality of recyclable support piles of each row of the enclosure structures are connected with a crown beam, and a first prestressed structure is arranged in the crown beam. Two ends of the bridge type prestress supporting system are respectively arranged on a crown beam and connected with the crown beam, a bearing surface used for bearing a soil body is arranged on the bridge type prestress supporting system, and a second prestress structure is arranged in the bridge type prestress supporting system. The recyclable prestress supporting system can reduce the construction cost and improve the construction efficiency and the construction quality.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a recyclable prestress supporting system and a construction method.
Background
A supporting system of a supporting pile and an inner support is one of the most common and widely applied supporting types in foundation pit engineering. The support piles and the inner supports are made of concrete materials, the applicability is high, the deformation of the foundation pit is well controlled, the concrete needs maintenance time, the construction period is long, the supports are still dismantled after the foundation pit engineering is completed, building waste is generated, and resource waste is caused. In some municipal pipe gallery projects, a foundation pit with a certain width and a long longitudinal length needs to be excavated, and construction needs to be carried out in a longitudinal division manner.
In the work progress of piping lane engineering, need be in the both sides full-line construction concrete supporting construction of piping lane to play the effect of strutting, its supporting member can't retrieve after the construction is accomplished, and current supporting member often is passive strut, and its deformation is difficult to control, in order to guarantee that it has better supporting effect, often with the great size of supporting member's cross-sectional design, it has further improved the cost that is difficult to retrieve. Simultaneously, in the work progress of foundation ditch, need excavate the earthwork and transport out the place, need transport back backfill with partial earthwork again after the piping lane construction finishes, reduced the efficiency of construction simultaneously, increased construction cost and carbon emission volume.
Therefore, a recyclable prestressed supporting system and a construction method thereof are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a recyclable prestress supporting system and a construction method, which can reduce construction cost and improve construction efficiency and construction quality.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a recyclable prestressed support system comprising: the foundation pit supporting structure comprises two rows of enclosing structures, wherein the two rows of enclosing structures are arranged on two sides of a foundation pit at intervals, each row of enclosing structures comprises a plurality of sequentially meshed recyclable supporting piles, and a first pre-stress structure is arranged in each recyclable supporting pile; the recyclable support piles of each row of the enclosure structure are connected with one crown beam, and the first prestressed structure is arranged in each crown beam; the two ends of the bridge type prestress supporting system are respectively arranged on the crown beam and connected with the crown beam, a bearing surface used for bearing a soil body is arranged on the bridge type prestress supporting system, and a second prestress structure is arranged in the bridge type prestress supporting system.
Furthermore, the bridge type prestress supporting system comprises a plurality of bearing assemblies, the bearing assemblies are distributed along the length direction of the crown beam, two ends of each bearing assembly are connected with the crown beam through supporting assemblies respectively, and the second prestress structure is arranged on each bearing assembly.
Further, the bearing assembly comprises: the bridge deck girders are distributed along the length direction of the crown girders, two ends of each bridge deck girder are respectively connected with the crown girders through an inclined support, and the second prestressed structure is arranged on the bridge deck girders; the supporting plate is arranged on the bridge deck main beam in a plurality of modes, and the top wall of the supporting plate forms the bearing surface.
Further, the deck girder includes: the side surfaces of the two H-shaped steels are spliced through a connecting plate; and the stiffening ribs are arranged in the H-shaped steel.
Further, the bridge prestressed support system further comprises: the two ends of each high-strength steel bar are respectively connected with the crown beam, and the two ends of each high-strength steel bar are respectively arranged corresponding to one inclined support; the displacement adjuster is arranged on the high-strength steel bar and used for controlling the high-strength steel bar to bear part of thrust applied to the crown beam by the soil body.
Further, the first pre-stressed structure comprises: two first anchorage devices arranged at intervals, wherein the first anchorage devices are arranged in the recyclable support piles and the crown beams; and two ends of the first steel strand are fixedly connected with the two first anchors respectively.
Further, the second pre-stressed structure comprises: two second anchorage devices which are arranged at intervals are arranged in the bridge type prestress supporting system; the two ends of the second steel strand are respectively fixedly connected with the second anchorage device; and one ends of the supporting rods are connected with the bridge type prestress supporting system, and the other ends of the supporting rods are connected with the steel strands.
Furthermore, a plurality of first prestress structures are arranged in the crown beam, and a plurality of second prestress structures are arranged in the bridge type prestress supporting system.
Further, the recoverable support pile comprises a recoverable steel pipe and plastic concrete arranged on the outer side of the recoverable steel pipe, the plastic concrete of two adjacent recoverable support piles are meshed with each other, and the first prestress structure is arranged in the recoverable steel pipe.
A construction method of a recyclable prestressed supporting system, based on the recyclable prestressed supporting system, comprising: s1, respectively arranging a building enclosure on two sides of the foundation pit of the construction section; s2, fixedly connecting two crown beams on the inner sides of the tops of the two rows of enclosure structures; s3, mounting a bridge type prestress supporting system on the crown beam; s4, carrying out earth excavation in a foundation pit of a construction section, piling partial soil on a bearing surface of the bridge type prestress support system, and applying prestress of the first prestress structure in the enclosure structure and the second prestress structure in the bridge type prestress support system according to requirements in the excavation process; s5, backfilling the soil body into the construction section foundation pit after the construction of the underground structure in the construction section foundation pit is finished; s6, releasing the prestress of the first prestress structure and the second prestress structure, and dismantling the prestress system, the crown beam and part of the enclosure structure; s7, repeating the steps S1-S6 in the next construction section until the construction of the whole construction section is finished.
The invention has the beneficial effects that: because the recoverable fender pile can be retrieved for it can be in proper order in each construction section construction of piping lane engineering and retrieve the circulation, can play the cyclic utilization effect in the work progress, and can finally retrieve after whole piping lane engineering construction finishes, thereby play reduce cost and reduce the effect of time limit for a project, be favorable to improving efficiency of construction and convenience, and effectively improved resource utilization, avoided the wasting of resources problem. Meanwhile, the bridge type prestress supporting system can be recycled in each construction section due to the connection with the crown beam, and when the bridge type prestress supporting system bears load, the force of the load can be transmitted to the crown beam and the recyclable support piles, so that the reliability of the load bearing of the bridge type prestress supporting system is well guaranteed. In the construction process of the construction section, the soil body excavated in the foundation pit can be accumulated on the bearing surface of the bridge type prestress supporting system, so that the soil body can be processed nearby without being transported out of the foundation pit, and the soil body on the bearing surface can be directly used in the later construction stage of the construction section and used for backfilling, thereby avoiding the repeated ineffective transportation of the soil body, and reducing the construction cost and the carbon emission. And a second prestress structure is arranged in the bridge type prestress supporting system, so that the bending rigidity of the bridge type prestress supporting system in the vertical direction can be better ensured, and the reliability of the bridge type prestress supporting system in load bearing can be further ensured. Because the first prestress structure can actively improve the bending resistance of the recyclable support piles and the crown beams, the section size design of the recyclable support piles and the crown beams can be further optimized, so that the recyclable support piles and the crown beams are not required to be designed to be large according to the bending resistance requirement, the design flexibility is improved, and the production cost is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a recyclable prestressed supporting system according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a bridge prestressed support system and a second prestressed structure according to an embodiment of the present invention;
FIG. 3 is an elevation view of a bridge prestressed support system, a second prestressed structure and a crown beam provided by an embodiment of the present invention;
FIG. 4 is one of the schematic internal partial structures of a recyclable fender pile and a crown beam according to embodiments of the invention;
fig. 5 is a second schematic view of the internal partial structure of the recoverable support pile and the crown beam according to the embodiment of the invention;
fig. 6 is a flowchart of a construction method of a recyclable prestressed supporting system according to an embodiment of the present invention.
Reference numerals
1. A recyclable support pile; 11. the steel pipe can be recycled; 12. plastic concrete;
2. a first pre-stressed structure; 21. a first anchor; 22. a first steel strand;
3. a crown beam;
4. a bridge prestressed support system; 41. a load bearing assembly; 411. a bridge deck girder; 4111. h-shaped steel; 4112. a connecting plate; 4113. a stiffening rib; 412. an inclined support; 413. a support plate; 414. a connecting beam; 42. a high-strength steel bar; 43. a displacement adjuster;
5. a second pre-stressed structure; 51. a second anchor; 52. a second steel strand; 53. a support bar;
101. a base plate; 102. a pipe gallery; 103. and (4) soil body.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The recyclable prestressed supporting system and construction method according to the embodiment of the present invention will be described with reference to fig. 1 to 6.
As shown in fig. 1-5, fig. 1 discloses a recyclable prestressed support system, which includes two rows of building envelopes, two crown beams 3 and a bridge prestressed support system 4. Two rows of building enclosures are arranged on two sides of the foundation pit at intervals, each row of building enclosures comprises a plurality of sequentially meshed recyclable support piles 1, and a first pre-stress structure 2 is arranged in each recyclable support pile 1. A plurality of recyclable support piles 1 of each row of building enclosure are connected with a crown beam 3, and a first prestressed structure 2 is arranged in the crown beam 3. Two ends of the bridge type prestress supporting system 4 are respectively arranged on one crown beam 3 and connected with the crown beam 3, a bearing surface for bearing the soil body 103 is arranged on the bridge type prestress supporting system 4, and a second prestress structure 5 is arranged in the bridge type prestress supporting system 4.
It can be understood that because recoverable fender pile 1 can be retrieved for it can be in each construction section construction of piping lane engineering in proper order and retrieve the circulation, can play cyclic utilization effect in the work progress, and can finally retrieve after whole piping lane engineering construction finishes, thereby play reduce cost and reduce time limit for a project's effect, be favorable to improving efficiency of construction and convenience, and effectively improved resource utilization, avoided the wasting of resources problem.
Meanwhile, the bridge type prestress supporting system 4 can be recycled in each construction section due to the connection with the crown beam 3, and when the bridge type prestress supporting system bears load, the force of the load can be transmitted to the crown beam 3 and the recyclable support pile 1, so that the reliability of the bearing load is well ensured. In the construction process of the construction section, the soil body 103 excavated in the foundation pit can be accumulated on the bearing surface of the bridge type prestress supporting system 4, so that the soil body 103 can be processed nearby without being transported out of the foundation pit, and the soil body 103 on the bearing surface can be directly used in the later construction stage of the construction section and used for backfilling, thereby avoiding repeated invalid transportation of the soil body 103, reducing the construction cost and carbon emission and improving the construction efficiency. And a second prestress structure 5 is arranged in the bridge type prestress supporting system 4, so that the bending rigidity of the bridge type prestress supporting system in the vertical direction can be better ensured, and the reliability of the bridge type prestress supporting system in load bearing can be further ensured.
Because the first prestressed structure 2 can actively improve the bending resistance of the recyclable fender pile 1 and the recyclable crown beam 3, the sectional dimension design of the recyclable fender pile 1 and the recyclable crown beam 3 can be further optimized, so that the recyclable fender pile does not need to be designed to be large according to the bending resistance requirement, the design flexibility is improved, and the production cost is reduced.
In some embodiments, as shown in fig. 1 to 3, the bridge prestressed supporting system 4 includes a plurality of load bearing assemblies 41, the plurality of load bearing assemblies 41 are distributed along the length direction of the crown beam 3, two ends of the load bearing assemblies 41 are respectively connected with the crown beam 3 through the supporting assemblies, and the second prestressed structure 5 is provided on the load bearing assemblies 41.
It can be understood that the bearing component 41 can provide a bearing surface for bearing the soil 103, so as to better improve the bearing performance, and the supporting component can play a role in stably supporting the bearing component 41, so that the bearing component can bear the pressure of the soil 103 and can also transmit the pressure to the recyclable fender pile 1, and the bearing performance is better compared with that of a conventional supporting structure.
In some embodiments, as shown in fig. 1-3, load bearing assembly 41 includes a plurality of deck girders 411 and support plates 413. A plurality of deck girders 411 are distributed along the length direction of the crown beam 3, both ends of each deck girder 411 are respectively connected with the crown beam 3 through an inclined support 412, and a second prestressed structure 5 is arranged on the deck girders 411. The supporting plate 413 is disposed on the plurality of bridge deck girders 411, and a top wall of the supporting plate 413 forms a bearing surface.
It can be understood that the deck girder 411 has better strength and rigidity, thereby being convenient for providing stable support, the deck girder 411 is connected with the crown beam 3 through the inclined support 412, thereby being capable of transmitting the pressure of the soil body 103 borne by the support plate 413 to the inclined support 412, and the inclined support 412 can differentiate the pressure of the soil body 103 into horizontal thrust and vertical pressure, thereby not only forming support force for the recoverable support piles 1 on both sides, but also regulating and controlling the horizontal displacement of the recoverable support piles 1, thereby better ensuring the reliable bearing of the soil body 103 and the reliable supporting effect of the recoverable support piles 1.
In some embodiments, as shown in fig. 2, the bearing assembly 41 further includes a plurality of connecting beams 414, the plurality of connecting beams 414 are spaced apart from each other on the deck main beam 411, and a supporting plate 413 is disposed between two adjacent connecting beams 414. It will be appreciated that the connecting beams 414 further strengthen the load bearing assembly 41 so that the support plates 413 more securely support the excavated earth mass 103.
In some embodiments, as shown in FIG. 2, deck girder 411 includes two H-beams 4111 and stiffeners 4113. The side surfaces of the two H-shaped steels 4111 are spliced through connecting plates 4112. The stiffening ribs 4113 are disposed inside the H-shaped steel 4111.
It can be understood that the H-shaped steel 4111 is convenient to connect with the crown beam 3, and has better strength and rigidity, thereby facilitating the realization of reliable support of the soil body 103. Connecting plate 4112 can be convenient for two adjacent H shaped steel 4111 fixed connection to improve two adjacent H shaped steel 4111's the connection steadiness, and then improve the reliability of bridge floor girder 411. Because H shaped steel 4111 is inside to have great space, set up a plurality of stiffening ribs 4113 and can further improve H shaped steel 4111's intensity and rigidity to further improve bridge deck girder 411's reliability.
In some embodiments, as shown in fig. 1-3, the bridge prestressed support system 4 further includes a plurality of high tensile steel rods 42 and a displacement adjuster 43. Two ends of the high-strength steel bar 42 are respectively connected with the crown beam 3, and two ends of each high-strength steel bar 42 are respectively arranged corresponding to one inclined support 412. The displacement regulator 43 is arranged on the high-strength steel bar 42, and the displacement regulator 43 is used for controlling the high-strength steel bar 42 to bear part of thrust applied to the crown beam 3 by the soil body 103.
It can be understood that when the bearing assembly 41 bears no soil 103 or bears a small amount of soil 103, the pile tops of the recoverable support piles 1 at the two sides of the foundation pit have a tendency to horizontally displace towards the interior of the foundation pit under the action of the lateral pressure at the outer side of the foundation pit, and the displacement controller can control the high-strength steel bars 42 not to bear force. When the soil mass 103 borne by the bearing component 41 is gradually increased, the soil mass 103 exerts an acting force on the bearing component 41, and the bearing component 41 is connected with the recyclable fender pile 1, so that the pile body of the recyclable fender pile 1 has a tendency of large horizontal displacement towards the outer side of the foundation pit under the acting force. In this embodiment, because still be equipped with the rod iron 42 that excels in between two crown beam 3 for the rod iron 42 that excels in is connected through crown beam 3 with two recoverable fender pile 1 that set up relatively, and under the effect of displacement regulator 43 this moment, the rod iron 42 that excels in can bear the partial thrust of soil body 103 effort, thereby the displacement of effective control recoverable fender pile 1 pile bolck towards the foundation ditch outside, avoid bearing component 41 to push out recoverable fender pile 1 pile bolck, further guaranteed recoverable fender pile 1 and bridge type prestressing force braced system 4's reliability.
In some embodiments, as shown in fig. 4 and 5, the first pre-stressing structure 2 comprises two first anchors 21 and a first steel strand 22 arranged at a distance. The first anchorage 21 is provided in the recoverable support pile 1 and in the crown beam 3. Two ends of the first steel strand 22 are respectively fixedly connected with the two first anchors 21.
It can be understood that, two first ground tackle 21 fixed connection are in recoverable fender pile 1 or hat roof beam 3, make the steel strand wires with two first ground tackle 21 fixed connection can carry out the prestressing force stretch-draw in one or two first ground tackle 21 departments, thereby realize the tensioning effect, and then improve the bending resistance of recoverable fender pile 1, be favorable to improving the effect of strutting of recoverable fender pile 1, improve hat roof beam 3's bending resistance, thereby be convenient for resist the side pressure that soil body 103 caused recoverable fender pile 1, be favorable to improving the effect of strutting of recoverable fender pile 1.
Specifically, but recovery type fender pile 1 extends the setting along vertical direction, and crown beam 3 extends the setting along the horizontal direction, and in actual work progress, can carry out the prestressing force of first steel strand wires 22 through carrying out the prestressing force tensioning of first steel strand wires 22 at the first ground tackle 21 that is located recovery type fender pile 1 upside, and the prestressing force tensioning of first steel strand wires 22 is carried out at two first ground tackle 21 departments that are located the both ends of crown beam 3, of course, in other construction occasions, also can adjust according to actual construction conditions, need not carry out concrete limit.
In some embodiments, as shown in fig. 2 and 3, the second pre-stressing structure 5 comprises two spaced apart second anchors 51, a second steel strand 52 and a plurality of spaced apart support bars 53. A second anchorage 51 is provided within the bridge prestressed support system 4. Two ends of the second steel strand 52 are fixedly connected with a second anchorage device 51 respectively. One end of the support rod 53 is connected with the bridge type prestress support system 4, and the other end is connected with the steel strand.
It can be understood that the two second anchors 51 are fixedly connected in the bridge type prestressed supporting system 4, so that the steel strand fixedly connected with the two second anchors 51 can be subjected to prestress tensioning at one or two second anchors 51, thereby realizing tensioning, thereby improving the bending resistance of the bridge type prestressed supporting system 4, and in addition, the steel strand can also apply pressure to the supporting rod 53 in the prestress tensioning process, so as to further improve the bending rigidity of the bridge type prestressed supporting system 4 in the vertical direction, thereby ensuring the capability of the bridge type prestressed supporting system 4 for bearing the soil mass 103.
Specifically, in this embodiment, the two second anchors 51 are connected through the recyclable steel pipe 11 with a curved section, and the second steel strand 52 is inserted into the recyclable steel pipe 11, so that the support rod 53 is connected with the recyclable steel pipe 11, and the steel strand can apply pressure to the support rod 53 when the steel strand is prestressed and tensioned, thereby improving the vertical bending rigidity of the bridge-type prestressed support system 4.
It should be noted that, in the embodiment of the present invention, the structures of the first pre-stressed structure 2 and the second pre-stressed structure are not limited to the above description, for example, the first pre-stressed structure 2 may also be additionally provided with a plurality of support rods 53, the second pre-stressed structure 5 may also be provided with only the second anchors 51 and the second steel strands 52, and the specific structures of the first pre-stressed structure 2 and the second pre-stressed structure 5 in the retractable fender pile 1, the crown beam 3 and the bridge type pre-stressed support system 4 may be adjusted according to the actual construction requirements, the construction difficulty and other field reasons, without being particularly limited.
In some embodiments, a plurality of first pre-stressing structures 2 are provided in the crown beam 3, and a plurality of second pre-stressing structures 5 are provided in the bridge pre-stressing support system 4.
It will be appreciated that the crown beam 3 and the bridge pre-stressed support system 4 will typically have a longer length during part of the construction period. Therefore, the plurality of first prestressed structures 2 are arranged in the crown beam 3, so that the prestressed tensioning effect can be further improved, the bending resistance of the crown beam 3 is further improved, the lateral pressure resistance of the crown beam is improved, and the reliability of a supporting system is further ensured. The plurality of second prestressed structures 5 are arranged in the bridge type prestressed supporting system 4, so that the bending rigidity of the bridge type prestressed supporting system 4 can be further improved, the capability of the bridge type prestressed supporting system 4 for bearing the soil body 103 is better ensured, the soil body 103 is prevented from falling in the construction process, and the construction safety is ensured.
In some embodiments, as shown in fig. 4 and 5, the recyclable pile 1 includes a recyclable steel pipe 11 and a plastic concrete 12 provided outside the recyclable steel pipe 11, the plastic concrete 12 of adjacent two recyclable piles 1 are engaged with each other, and a pre-stressed structure is provided inside the recyclable steel pipe 11.
It can be understood that the recyclable steel pipe 11 can be conveniently removed after construction of one section of construction is completed, so that the recyclable steel pipe is applied to construction of the next section of the recyclable support pile 1, the turnover rate of construction materials is increased, and the construction cost is reduced. Simultaneously, because the plastic concrete 12 interlock of two adjacent recoverable fender piles 1 each other, can make a plurality of recoverable fender piles 1 overlap joint each other, play better stagnant water effect, recoverable steel pipe 11 can provide resistance for recoverable fender pile 1 to bear the pressure of foundation ditch both sides, ensure the safe construction of pipe gallery 102 in the foundation ditch.
In addition, the support system formed by the recyclable steel pipe 11 and the plastic concrete 12 has the characteristics of modular assembly, recycling and high construction speed, so that the support system is adapted to the segmented construction of each construction section in the pipe gallery engineering, and is convenient to dismantle to the next construction section for construction after the construction of the previous construction section is finished. And the depth of the foundation pit of the pipe gallery engineering is usually 6-7m, and the depth is also favorable for the construction of a supporting system formed by the recyclable steel pipe 11 and the plastic concrete 12, so that the supporting quality is better ensured.
In some specific embodiments, as shown in fig. 4 and 5, the recyclable steel pipe 11 has a rectangular cross section, the crown beam 3 is made of steel, and the crown beam 3 has a rectangular cross section.
It can be understood that, because the cross-section of crown beam 3 and recoverable steel pipe 11 is the rectangle, thereby be convenient for chisel out the inside local plastic concrete 12 in recoverable fender pile 1 top in the work progress, so that recoverable steel pipe 11 of recoverable fender pile 1 exposes, can be convenient for crown beam 3 and recoverable steel pipe 11 laminate and pass through bolt fixed connection, also can be convenient for form the step on recoverable fender pile 1, thereby provide partial supporting effect to crown beam 3, guaranteed crown beam 3 and recoverable fender pile 1's reliable connection.
As shown in fig. 6, the present invention also discloses a construction method of a recoverable prestressed supporting system, which is based on the above recoverable prestressed supporting system, and comprises: s1, respectively arranging a building enclosure on two sides of the foundation pit of the construction section; s2, fixedly connecting two crown beams on the inner sides of the tops of the two rows of enclosure structures; s3, mounting a bridge type prestress supporting system 4 on the crown beam; s4, carrying out earth excavation in a foundation pit of the construction section, stacking part of soil body 103 on a bearing surface of a bridge type prestress support system 4, and applying prestress of a first prestress structure 2 in the enclosure structure and a second prestress structure 5 in the bridge type prestress support system 4 according to requirements in the excavation process; s5, after the underground structure in the construction section foundation pit is constructed, backfilling the soil body 103 into the construction section foundation pit; s6, releasing the prestress of the first prestress structure 2 and the second prestress structure 5, and dismantling the bridge type prestress supporting system 4, the crown beam 3 and part of the enclosure structure; s7, repeating the steps S1-S6 in the next construction section until the construction of the whole construction section is finished.
It should be noted that, in the construction method of this embodiment, the first pre-stressed structure 2 is preset in both the enclosure structure and the crown beam 3, the second pre-stressed structure 5 is preset in the bridge-type pre-stressed support system 4, the first pre-stressed structure 2 is installed on the enclosure structure and the crown beam 3 when the members leave the factory, the second pre-stressed structure 5 in the bridge-type pre-stressed support system 4 is assembled on site, the first pre-stressed structure 2 in the crown beam 3 applies pre-stress when leaving the factory, and the first pre-stressed structure 2 in the enclosure structure and the second pre-stressed structure 5 in the bridge-type pre-stressed support system 4 apply pre-stress on site as required along with the construction process. Of course, in other embodiments of the present invention, the specific processing, application manner and sequence of the pre-stressed structure in each component can be determined according to actual requirements.
In addition, in the construction method of the embodiment, the crown beam 3 includes a plurality of standard knots, and one second prestressed structure 2 is arranged in each standard knot, so that the plurality of standard knots which are prestressed are sequentially connected to form the crown beam 3 on site. Of course, in other embodiments of the present invention, the crown beam 3 may also be formed by connecting a plurality of standard joints in advance, and the specific processing and connection sequence thereof may be determined according to actual requirements.
Example (b):
a recoverable prestressed supporting system and a construction method according to an embodiment of the present invention will be described with reference to fig. 1 to 6.
The recoverable prestressed supporting system of the embodiment comprises two rows of building enclosures, two crown beams 3, a bridge type prestressed supporting system 4, a first prestressed structure 2 and a second prestressed structure 5.
Two rows of building enclosures are arranged on two sides of the foundation pit at intervals, each row of building enclosures comprises a plurality of sequentially meshed recyclable support piles 1, and a first pre-stress structure 2 is arranged in each recyclable support pile 1. A plurality of recyclable support piles 1 of each row of building enclosure are connected with a crown beam 3, and a first prestressed structure 2 is arranged in the crown beam 3. The recoverable support pile 1 comprises a recoverable steel pipe 11 and plastic concrete 12 arranged on the outer side of the recoverable steel pipe 11, the plastic concrete 12 of two adjacent recoverable support piles 1 are mutually meshed, and a prestress structure is arranged in the recoverable steel pipe 11.
The first pre-stressed structure 2 comprises two first anchors 21 and a first steel strand 22 arranged at intervals. The first anchorage 21 is provided in the recoverable support pile 1 and in the crown beam 3. Two ends of the first steel strand 22 are respectively fixedly connected with the two first anchors 21.
Two ends of the bridge type prestress supporting system 4 are respectively arranged on one crown beam 3 and connected with the crown beam 3, a bearing surface for bearing the soil body 103 is arranged on the bridge type prestress supporting system 4, and a second prestress structure 5 is arranged in the bridge type prestress supporting system 4. The bridge type prestress supporting system 4 comprises a plurality of bearing assemblies 41, the plurality of bearing assemblies 41 are distributed along the length direction of the crown beam 3, two ends of each bearing assembly 41 are respectively connected with the crown beam 3 through the supporting assemblies, and the second prestress structure 5 is arranged on each bearing assembly 41. The load bearing assembly 41 includes a plurality of deck girders 411 and support plates 413. A plurality of deck girders 411 are distributed along the length direction of the crown beam 3, both ends of each deck girder 411 are respectively connected with the crown beam 3 through an inclined support 412, and a second prestressed structure 5 is arranged on the deck girders 411. The supporting plate 413 is disposed on the plurality of bridge deck girders 411, and a top wall of the supporting plate 413 forms a bearing surface. The deck girder 411 includes two H-shaped steels 4111 and a stiffener 4113. The side surfaces of the two H-shaped steels 4111 are spliced through connecting plates 4112. The stiffening ribs 4113 are disposed inside the H-shaped steel 4111. The bridge prestressed support system 4 further includes a plurality of high-strength steel rods 42 and a displacement adjuster 43. Two ends of the high-strength steel bar 42 are respectively connected with the crown beam 3, and two ends of each high-strength steel bar 42 are respectively arranged corresponding to one inclined support 412. The displacement regulator 43 is arranged on the high-strength steel bar 42, and the displacement regulator 43 is used for controlling the high-strength steel bar 42 to bear part of thrust applied to the crown beam 3 by the soil body 103.
The second prestressed structure 5 includes two second anchors 51 arranged at intervals, a second steel strand 52 and a plurality of support rods 53 distributed at intervals. A second anchorage 51 is provided within the bridge prestressed support system 4. Two ends of the second steel strand 52 are fixedly connected with a second anchorage device 51 respectively. One end of the support rod 53 is connected with the bridge type prestress support system 4, and the other end is connected with the steel strand.
The construction method of the recyclable prestressed supporting system comprises the following steps:
s1, in a construction section of the pipe gallery engineering, a hole forming process is carried out along the edge of the foundation pit, the recyclable steel pipe 11 is hoisted in the hole forming process, and the plastic concrete 12 is poured to form the mutually meshed enclosure structure.
And S2, chiseling part of the plastic concrete 12 at the top of the recyclable pile 1 close to the inner side of the foundation pit to expose the recyclable steel pipe 11, and fixedly connecting and installing the crown beam 3 on the exposed recyclable steel pipe 11 to form the recyclable pile 1 and the crown beam 3 into a whole.
And S3, assembling the bridge type prestressed supporting system 4 on site, and connecting two ends of the bridge type prestressed supporting system 4 with the two crown beams 3.
And S4, following the excavation of the foundation pit, covering the excavated partial soil body 103 on the bridge type prestress supporting system 4, applying the prestress of the bridge type prestress supporting system 4 according to the requirement, and recovering the prestress of the support pile 1.
S5, excavating to the bottom in the foundation pit, constructing the bottom plate 101 and the pipe gallery 102 in the foundation pit, and backfilling the soil body 103 on the bridge type prestress supporting system 4 into the foundation pit after construction.
S6, releasing the prestress of the first prestress structure 2 in the enclosing structure and the second prestress structure 5 in the bridge type prestress supporting system 4, dismantling the bridge type prestress supporting system 4 and the crown beam 3, pulling out the recyclable steel pipe 11 in the recyclable supporting pile 1, and backfilling the inside of the plastic concrete 12 to be dense.
And S7, repeating the steps S1-S6 until the construction of the whole construction section is finished, and recovering the recyclable prestress supporting system after the construction is finished.
In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A recyclable pre-stressed support system, comprising:
the foundation pit supporting structure comprises two rows of enclosing structures, wherein the two rows of enclosing structures are arranged on two sides of a foundation pit at intervals, each row of enclosing structures comprises a plurality of sequentially meshed recyclable support piles (1), and a first pre-stress structure (2) is arranged in each recyclable support pile (1);
the recyclable support piles (1) of each row of the enclosure structure are connected with one of the two crown beams (3), and the first prestressed structure (2) is arranged in each crown beam (3);
the supporting device comprises a bridge type prestress supporting system (4), wherein two ends of the bridge type prestress supporting system (4) are respectively arranged on a crown beam (3) and connected with the crown beam (3), a bearing surface used for bearing a soil body (103) is arranged on the bridge type prestress supporting system (4), and a second prestress structure (5) is arranged in the bridge type prestress supporting system (4).
2. The recyclable prestressed support system according to claim 1, wherein the bridge-type prestressed support system (4) comprises a plurality of load-bearing assemblies (41), a plurality of load-bearing assemblies (41) are distributed along the length direction of the crown beam (3), both ends of the load-bearing assemblies (41) are respectively connected with the crown beam (3) through support assemblies, and the second prestressed structure (5) is provided on the load-bearing assemblies (41).
3. The recoverable pre-stressed support system of claim 2, wherein the load bearing assembly (41) comprises:
the bridge deck girders (411) are distributed along the length direction of the crown beams (3), two ends of each bridge deck girder (411) are respectively connected with the crown beams (3) through an inclined support (412), and the second prestress structures (5) are arranged on the bridge deck girders (411);
the supporting plate (413), the supporting plate (413) is established a plurality ofly on the bridge floor girder (411), the roof of supporting plate (413) forms the loading face.
4. The recoverable prestressed support system according to claim 3, wherein said deck girder (411) comprises:
the side surfaces of the two H-shaped steels (4111) are spliced through connecting plates (4112);
a stiffening rib (4113), wherein the stiffening rib (4113) is arranged in the H-shaped steel (4111).
5. The recoverable pre-stressed support system according to claim 3, wherein the bridge pre-stressed support system (4) further comprises:
the two ends of each high-strength steel bar (42) are respectively connected with the crown beam (3), and the two ends of each high-strength steel bar (42) are respectively arranged corresponding to one inclined support (412);
the displacement regulator (43) is arranged on the high-strength steel bar (42), and the displacement regulator (43) is used for controlling the high-strength steel bar (42) to bear part of thrust applied to the crown beam (3) by the soil body (103).
6. The recoverable pre-stressed support system according to claim 1, wherein the first pre-stressed structure (2) comprises:
two first anchorage devices (21) arranged at intervals, wherein the first anchorage devices (21) are arranged in the recoverable support pile (1) and the crown beam (3);
the two ends of the first steel strand (22) are fixedly connected with the two first anchors (21) respectively.
7. The recoverable pre-stressed support system according to claim 1, wherein the second pre-stressed structure (5) comprises:
two second anchors (51) arranged at intervals, wherein the second anchors (51) are arranged in the bridge type prestress supporting system (4);
the two ends of the second steel strand (52) are respectively fixedly connected with the second anchorage device (51);
the steel strand supporting device comprises a plurality of supporting rods (53) distributed at intervals, wherein one ends of the supporting rods (53) are connected with the bridge type prestress supporting system (4), and the other ends of the supporting rods are connected with the steel strands.
8. The recyclable prestressed support system according to claim 1, characterized in that a plurality of said first prestressed structures (2) are provided in said crown beam (3) and a plurality of said second prestressed structures (5) are provided in said bridge-type prestressed supporting system (4).
9. The recoverable pre-stressed support system according to claim 1, wherein the recoverable support pile (1) comprises a recoverable steel pipe (11) and a plastic concrete (12) provided outside the recoverable steel pipe (11), the plastic concrete (12) of two adjacent recoverable support piles (1) engaging each other, the first pre-stressed structure (2) being provided within the recoverable steel pipe (11).
10. A construction method of a recyclable prestressed support system based on the recyclable prestressed support system according to any one of claims 1 to 9, comprising:
s1, respectively arranging a building enclosure on two sides of the foundation pit of the construction section;
s2, fixedly connecting a crown beam (3) on the inner side of the top of the enclosure structure;
s3, mounting a bridge type prestress supporting system (4) on the crown beam (3);
s4, carrying out earth excavation in a foundation pit of a construction section, stacking an earth body (103) in the pit on a bearing surface of the bridge type prestress supporting system (4) in the excavation process, and applying prestress of the first prestress structure (2) in the enclosure structure and the second prestress structure (5) in the bridge type prestress supporting system (4) according to requirements;
s5, after the underground structure in the construction section is constructed, backfilling the soil body (103) into the construction section;
s6, releasing the prestress of the first prestress structure (2) in the building envelope and the second prestress structure (5) in the bridge type prestress supporting system (4), and dismantling the bridge type prestress supporting system (4), the crown beam (3) and part of the building envelope;
s7, repeating the steps S1-S6 in the next construction section until the construction of the whole construction section is finished.
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| CN202110986047.XA CN113529746A (en) | 2021-08-26 | 2021-08-26 | Recyclable prestress supporting system and construction method |
| PCT/CN2021/139584 WO2023024348A1 (en) | 2021-08-26 | 2021-12-20 | Recyclable prestressed support system and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110986047.XA CN113529746A (en) | 2021-08-26 | 2021-08-26 | Recyclable prestress supporting system and construction method |
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| WO (1) | WO2023024348A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737594A (en) * | 2022-05-06 | 2022-07-12 | 江苏海洋大学 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
| WO2023024348A1 (en) * | 2021-08-26 | 2023-03-02 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestressed support system and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116770856A (en) * | 2023-06-12 | 2023-09-19 | 湖北省工业建筑集团有限公司 | Building construction foundation soil slope supporting construction |
| CN117592172B (en) * | 2024-01-18 | 2024-04-16 | 华东交通大学 | Reverse design method and system for deformation control of foundation pit support structure |
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| JPH11293681A (en) * | 1998-04-13 | 1999-10-26 | Hara Sogyo Kk | Slope greening construction method by concrete spraying slope frame by use of simple spraying plate frame |
| EP2010717B1 (en) * | 2006-04-26 | 2012-12-26 | Wilhelm Hess | Method for lining ditches |
| CN105256809B (en) * | 2015-09-25 | 2017-03-29 | 江苏东合南岩土科技股份有限公司 | A kind of utilization prestressing force H profile steel supporting construction carries out the construction method of supporting |
| CN105804093B (en) * | 2016-05-05 | 2017-10-03 | 宁波建工工程集团有限公司 | Prefabricated double-row pile foundation pit supporting construction integrated with water-stop curtain and its construction method |
| CN108914970A (en) * | 2018-08-06 | 2018-11-30 | 中铁第四勘察设计院集团有限公司 | A kind of prestressed pavement flap support structure |
| CN211312530U (en) * | 2019-05-20 | 2020-08-21 | 辽宁巨维建设工程有限公司 | Arched inner support of deep foundation pit |
| CN212104108U (en) * | 2020-01-21 | 2020-12-08 | 青岛瑞源工程集团有限公司 | Recoverable assembled prestressing force suspension cable foundation ditch support piece |
| CN113529746A (en) * | 2021-08-26 | 2021-10-22 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestress supporting system and construction method |
-
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023024348A1 (en) * | 2021-08-26 | 2023-03-02 | 中冶建筑研究总院（深圳）有限公司 | Recyclable prestressed support system and construction method |
| CN114737594A (en) * | 2022-05-06 | 2022-07-12 | 江苏海洋大学 | Large-span unbonded prestressed tendon's fish belly formula foundation beam |
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| WO2023024348A1 (en) | 2023-03-02 |
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