CN111335350A - Oppositely clamped prestressed cable-stayed foundation - Google Patents
Oppositely clamped prestressed cable-stayed foundation Download PDFInfo
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- CN111335350A CN111335350A CN202010352664.XA CN202010352664A CN111335350A CN 111335350 A CN111335350 A CN 111335350A CN 202010352664 A CN202010352664 A CN 202010352664A CN 111335350 A CN111335350 A CN 111335350A
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- anchor plate
- foundation
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- stayed
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 abstract description 12
- 239000004568 cement Substances 0.000 abstract description 6
- 239000002002 slurry Substances 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 239000010426 asphalt Substances 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013142 basic testing Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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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
- E02D5/80—Ground anchors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/20—Side-supporting means therefor, e.g. using guy ropes or struts
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a clamp-type prestressed diagonal foundation which comprises a lower anchor plate in a deep foundation pit, an upper anchor plate in a shallow foundation pit and finish-rolled deformed steel bars connected with the upper anchor plate and the upper anchor plate, wherein the finish-rolled deformed steel bars penetrating through inclined holes of the upper anchor plate and the lower anchor plate are tensioned through a prestressed nut, then grouting is carried out through a reserved grouting pipe until cement slurry overflows from the top, and the grouting pipe is pulled out. The parts of the upper anchor plate and the lower anchor plate, such as the prestressed nuts, the finish-rolled deformed steel bars and the like which are not wrapped by cement paste, are subjected to anti-corrosion treatment by adopting asphalt. And (5) backfilling the foundation pits of the upper anchor plate and the lower anchor plate and compacting. The invention solves the technical problems of high construction cost, uneconomic performance, poor safety, incapability of ensuring construction quality and poor reliability in the prior art.
Description
Technical Field
The invention relates to a diagonal draw foundation, in particular to a clamp type prestress diagonal draw foundation. The photovoltaic flexible support diagonal tension foundation is mainly applicable to photovoltaic flexible supports.
Background
The flexible photovoltaic support system is a novel support system, the support system is simplified by fixing a photovoltaic assembly on a steel strand tensioned between two columns, the dead weight, snow load and wind load of the assembly are resisted by the axial tension of the tensioned steel strand, the flexible photovoltaic support system belongs to a geometric nonlinear stress system, the stress and deformation characteristics are complex, the axial force of the tensioned steel strand is finally shared by a diagonal draw bar and an end stand column of the end part (the diagonal draw bar is tensioned, the end stand column is stressed), and the diagonal draw force of the diagonal draw bar is large, so that the requirement cannot be met in a general basic form.
The foundation mode mainly adopted in the market at present is ① cast-in-place pile prefabricated foundation and ② anchor rod expanded head foundation (high-pressure jet expanded head anchor rod foundation). The disadvantages exist that ① cast-in-place pile prefabricated foundation has larger vertical bearing capacity, and the horizontal bearing capacity is generally less influenced by soil around the pile, if the horizontal bearing capacity is larger, the cast-in-place pile needs larger pile diameter and burial depth, the cost is higher, the cast-in-place pile construction machinery is huge, the construction in mountain land environment is more difficult, ② anchor rod expanded head foundation (high-pressure jet expanded head anchor rod foundation) has the large part of anchor rod bearing capacity provided by an end expanded head, but the expanded head is formed by cutting soil by high-pressure jet flow beams, and the size of the expanded head and the pouring quality of concrete cannot be ensured.
Disclosure of Invention
In view of the defects in the prior art, the invention provides a clamp-type prestressed cable-stayed foundation to solve the technical problems that the construction cost is high, the construction cost is not economical, the safety is poor, the construction quality cannot be guaranteed and the reliability is poor in the prior art.
In order to solve the technical problems and achieve the purpose of the invention, the invention adopts the following technical scheme: the utility model provides a butt clamp formula prestressing force draws basis to one side, includes anchor slab and last anchor slab down, be equipped with the anchor ear above going up the anchor slab, seted up the inclined hole on the upper and lower anchor slab respectively, upper and lower anchor slab is arranged in shallow, deep foundation ditch respectively to link into an integrated entity through fastening mechanism, and correspond and press from both sides tight shallow, deep foundation ditch lateral wall.
Furthermore, the fastening mechanism comprises finish-rolled deformed steel bars and pre-stressed nuts, wherein the upper ends and the lower ends of the finish-rolled deformed steel bars penetrate through inclined holes formed in the upper anchor plate and the lower anchor plate, and the finish-rolled deformed steel bars are tensioned and fixed by the pre-stressed nuts.
Furthermore, the anchor lug is connected with a diagonal draw bar connected to the end upright post through a U-shaped adjustable mechanism.
Furthermore, the inclined hole of the upper anchor plate is formed in the overlapping position of the upper anchor plate and the anchor lug seat, and the inclined hole of the lower anchor plate is formed in the convex edge on the inclined hole.
Furthermore, a grouting opening is formed in the upper anchor plate.
Further, the grouting opening can be inserted into a PVC grouting pipe.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides the uplift resistance by using the resistance of the soil body on the front end surface of the lower anchor plate, which is similar to the stress principle of the anchor rod enlarged footing foundation, but the invention overcomes the defects of complex construction process and difficult guarantee of construction quality of the anchor rod enlarged footing foundation. And the defect of high construction cost of the cast-in-place pile prefabricated foundation is overcome. In a word, the invention is safe and reliable, the adopted construction machinery is simple, the technical process is simple and convenient, the operation is easy, and the invention has obvious economic advantages.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a front view of the main structure of the present invention.
Fig. 3 is a right side view of the main structure of the present invention.
Fig. 4 is an enlarged view of a portion a in fig. 3.
In the figure: 1-upper anchor plate, 2-lower anchor plate, 3-anchor lug, 4-shallow foundation pit, 5-deep foundation pit, 6-finish-rolled deformed steel bar, 7-prestressed nut, 8-U-shaped adjustable mechanism, 9-end upright post, 10-diagonal draw bar, 11-grouting opening and 12-PVC grouting pipe.
Detailed Description
The invention is further illustrated with reference to the figures and examples.
As shown in fig. 1 to 4, the invention provides a clamp-type prestressed cable-stayed foundation, which comprises a lower anchor plate 1 and an upper anchor plate 2, wherein an anchor lug 3 is arranged on the upper anchor plate 1, the anchor lug 3 is connected with a cable-stayed rod 10 connected to an end upright post 9 through a U-shaped adjustable mechanism 8, inclined holes are respectively arranged on the upper anchor plate 1 and the lower anchor plate 2, preferably, the inclined hole of the upper anchor plate 1 is arranged at the superposition position of the upper anchor plate 1 and an anchor lug 3, and the inclined hole of the lower anchor plate 2 is arranged on a convex edge thereon. The upper anchor plate 1 and the lower anchor plate 2 are respectively arranged in the shallow foundation pit 4 and the deep foundation pit 5, are connected into a whole through a fastening mechanism, and correspondingly clamp the side walls of the shallow foundation pit 4 and the deep foundation pit 5. The fastening mechanism comprises finish-rolled deformed steel bar 6 and a prestressed nut 7, wherein the upper end and the lower end of the finish-rolled deformed steel bar 6 penetrate through inclined holes formed in the upper anchor plate 1 and the lower anchor plate 2, and the inclined holes are tensioned and fixed by the prestressed nut 7. The upper anchor plate 1 and the lower anchor plate 2 which are respectively arranged in the shallow foundation pit 4 and the deep foundation pit 5 are tightly attached to the foundation pit wall to clamp the soil body. In the process of tensioning and fixing the prestressed nut 7, a tensioning device applies prestress to the finish-rolled deformed steel bar 6, and then the prestressed nut 7 is screwed to fix the steel bar. The tensioning equipment can select a jack, and the jack is utilized to apply pretension force to the finish-rolled deformed steel 6 at the upper anchor plate 1 to enable the lower anchor plate 2 to be tightly attached to the side wall of the foundation pit, so that the influence of a gap between the lower anchor plate 2 and the foundation pit on the overall deformation is eliminated. The pretension is applied to produce a certain deformation of the finish-rolled deformed steel bar 6. When the tension value subsequently acting on the upper anchor plate 1 is not greater than the pre-tension force, the clamp type pre-stress cable-stayed foundation does not deform; when the subsequent tension value acting on the upper anchor plate 1 is larger than the pretension force, the clamp-type prestressed cable-stayed foundation generates certain deformation, but the deformation is far smaller than that of a common anchor rod under the same working condition, and the control of the displacement of the top point of the end upright post 9 is very important. The initial pretension force can be the tension value of the upright diagonal draw bar 10 at the lower end of the flexible bracket under the self-weight action condition.
In order to prevent the finish rolling deformed steel bar penetrating into the soil body from being rusted and enhance the structural integrity, a grouting opening 11 is formed in the upper anchor plate 1, a PVC grouting pipe 12 is inserted into the grouting opening 11 to drill a hole in the soil body and pour cement slurry until the cement slurry overflows from the top, so that the finish rolling deformed steel bar 6 penetrating into the drilled hole is wrapped by the cement slurry, and then the PVC grouting pipe 12 is pulled out. The parts of the upper anchor plate 1 and the lower anchor plate 2, such as the prestressed nuts 7, the finish-rolled deformed steel bars 6 and the like which are not wrapped by cement paste, are subjected to anti-corrosion treatment by adopting asphalt. And (3) backfilling the foundation pits of the upper anchor plate 1 and the lower anchor plate 2 and compacting, wherein only the upper anchor plate 1 is leaked to connect the U-shaped adjustable mechanism 8 and the diagonal draw bar 10.
According to the required tension and the soil conditions (cohesive force and internal friction angle) of the field, the section size, the embedding depth and the hole drilling inclination angle of the soil body are determined according to the formula (4.6.3-1) of the technical specification of the high-pressure jet enlarged head anchor rod (JGJ/T282-2012).
The limit value of the uplift resistance of the oppositely clamped prestressed cable-stayed foundation is related to the soil quality, the burial depth of the lower anchor plate (enlarged head) and the inclination angle of a soil body drilling hole, and is determined by a field in-situ basic test; when no test data exists, the resistance of the soil body on the end face of the lower anchor plate (the enlarged head) to the lower anchor plate (the enlarged head) can be estimated (only the contribution of the resistance of the soil body on the end face of the lower anchor plate (the enlarged head) is considered) according to a formula (4.6.3-1) of high-pressure jet enlarged head anchor rod technical specification, but the resistance needs to be verified and determined through a field basic test during actual construction.
In the following, taking a flexible support case as an example, the economic efficiency is compared, obviously, the high-pressure injection expanded footing anchor rod foundation has lower cost than a bored pile foundation (a bored pile prefabricated foundation), and only the economic efficiency of the high-pressure injection expanded footing anchor rod foundation is needed to be compared with the high-pressure injection expanded footing anchor rod foundation.
Two foundation pits with the length of about 50m, the width of 1.2m and the depth of 4.5m are dug for arranging the oppositely clamped prestressed cable-stayed foundation, and the total length is about 100 m; 56 deep inclined holes with the inclination angle of 45 degrees and the depth of 6 meters are drilled. Phi 26 finish-rolled deformed steel bar 6.5x56=364 m; a prestressed nut: 56x2=112 pockets; upper and lower anchor plates: 28x2=56 sets; the average cost of each opposite clamping type prestress diagonal tension foundation is 635 yuan, and the cost of 56 foundations per megawatt is 35560 yuan
The high-pressure injection enlarged head anchor rod foundation is about 4000 yuan per 450 yuan per meter of cable-stayed foundation, and the cost of 56 foundations per megawatt is 224000 yuan
In conclusion, the invention has obvious economic advantages.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. The utility model provides a butt clamp formula prestressing force draws basis to one side, includes anchor slab (1) and anchor slab (2) down, its characterized in that: the anchor plate is characterized in that anchor lugs (3) are arranged on the upper anchor plate (1), inclined holes are respectively formed in the upper anchor plate (1) and the lower anchor plate (2), the upper anchor plate (1) and the lower anchor plate (2) are respectively arranged in the shallow foundation pit (4) and the deep foundation pit (5) and are connected into a whole through a fastening mechanism, and the side walls of the shallow foundation pit (4) and the deep foundation pit (5) are correspondingly clamped.
2. The opposite-clamping type prestressed cable-stayed foundation according to claim 1, characterized in that: the fastening mechanism comprises finish-rolled deformed steel bar (6) and a pre-stressed nut (7), wherein the upper end and the lower end of the finish-rolled deformed steel bar (6) penetrate through inclined holes formed in the upper anchor plate (1) and the lower anchor plate (2), and the pre-stressed nut (7) is tensioned and fixed.
3. The opposite-clamping type prestressed cable-stayed foundation according to claim 1, characterized in that: the anchor ear (3) is connected with a diagonal draw bar (10) connected on the end upright post (9) through a U-shaped adjustable mechanism (8).
4. The opposite-clamping type prestressed cable-stayed foundation according to claim 1, characterized in that: the inclined hole of the upper anchor plate (1) is arranged at the superposition position of the upper anchor plate (1) and the anchor lug (3) seat, and the inclined hole of the lower anchor plate (2) is arranged on the convex edge.
5. The oppositely clamped prestressed cable-stayed foundation as claimed in any one of claims 1 to 4, wherein: and a grouting opening (11) is formed in the upper anchor plate (1).
6. The opposite-clamping type prestressed cable-stayed foundation according to claim 1, characterized in that: the grouting opening (11) can be inserted into a PVC grouting pipe (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352664.XA CN111335350A (en) | 2020-04-29 | 2020-04-29 | Oppositely clamped prestressed cable-stayed foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352664.XA CN111335350A (en) | 2020-04-29 | 2020-04-29 | Oppositely clamped prestressed cable-stayed foundation |
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| Publication Number | Publication Date |
|---|---|
| CN111335350A true CN111335350A (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010352664.XA Pending CN111335350A (en) | 2020-04-29 | 2020-04-29 | Oppositely clamped prestressed cable-stayed foundation |
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| Country | Link |
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| CN (1) | CN111335350A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023178905A1 (en) * | 2022-03-22 | 2023-09-28 | 中交路桥建设有限公司 | Non-bottom sealed double-wall steel cofferdam structure and construction method therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201746840U (en) * | 2010-07-29 | 2011-02-16 | 林华国 | Foundation pit support system equipped with a plurality of inclined rear anchors capable of recycling |
| CN206310779U (en) * | 2016-12-27 | 2017-07-07 | 北京科诺伟业科技股份有限公司 | A kind of suspended-cable structure large span photovoltaic bracket |
| CN108400750A (en) * | 2018-03-27 | 2018-08-14 | 东南大学 | A kind of cable-stayed type flexible photovoltaic carrier unit and photovoltaic bracket |
| CN109510568A (en) * | 2018-12-27 | 2019-03-22 | 浙江立思能源科技股份有限公司 | A kind of tubular pile type flexible photovoltaic support system |
| CN212452735U (en) * | 2020-04-29 | 2021-02-02 | 南京市光翔新能源科技有限公司 | Oppositely clamped prestressed cable-stayed foundation |
-
2020
- 2020-04-29 CN CN202010352664.XA patent/CN111335350A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201746840U (en) * | 2010-07-29 | 2011-02-16 | 林华国 | Foundation pit support system equipped with a plurality of inclined rear anchors capable of recycling |
| CN206310779U (en) * | 2016-12-27 | 2017-07-07 | 北京科诺伟业科技股份有限公司 | A kind of suspended-cable structure large span photovoltaic bracket |
| CN108400750A (en) * | 2018-03-27 | 2018-08-14 | 东南大学 | A kind of cable-stayed type flexible photovoltaic carrier unit and photovoltaic bracket |
| CN109510568A (en) * | 2018-12-27 | 2019-03-22 | 浙江立思能源科技股份有限公司 | A kind of tubular pile type flexible photovoltaic support system |
| CN212452735U (en) * | 2020-04-29 | 2021-02-02 | 南京市光翔新能源科技有限公司 | Oppositely clamped prestressed cable-stayed foundation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023178905A1 (en) * | 2022-03-22 | 2023-09-28 | 中交路桥建设有限公司 | Non-bottom sealed double-wall steel cofferdam structure and construction method therefor |
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