CN213773506U - Anti structure of floating of prestressed anchorage pole - Google Patents
Anti structure of floating of prestressed anchorage pole Download PDFInfo
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- CN213773506U CN213773506U CN202022611095.4U CN202022611095U CN213773506U CN 213773506 U CN213773506 U CN 213773506U CN 202022611095 U CN202022611095 U CN 202022611095U CN 213773506 U CN213773506 U CN 213773506U
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- bottom plate
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Abstract
The utility model discloses a prestressed anchor anti-floating structure, which comprises a prestressed anchor, a cushion layer and a basement bottom plate, wherein the prestressed anchor comprises an anchor body and a rib body positioned at the center of the anchor body, and the top end of the anchor body is provided with a tension structure; the lower end of the rib body is fixed on the lower part of the anchor rod body, and the upper part of the anchor rod body is provided with a hollow cavity extending along the axis of the anchor rod body; the upper part of the rib body penetrates out of the hollow cavity and is fixedly connected with a tensioning structure, and a gap is formed between the hollow cavity and the rib body; the top of the tensioning structure is also provided with an anchoring structure, the anchoring structure is positioned in the basement bottom plate, and the top of the rib body is fixedly connected with the anchoring structure. The utility model has the characteristics of the construction is simple and convenient, economic nature is good, need not set up the stretch-draw hole on the basement bottom plate, is favorable to improving the construction progress, prevents the emergence of basement bottom plate seepage.
Description
Technical Field
The utility model relates to an anti structure of floating of prestressed anchorage pole belongs to building underground structure anti technical field that floats.
Background
Most basements have anti-floating problems. The solution generally adopted at present is to adopt HRB400 grade threaded steel bars, and the design value of the tensile strength of the threaded steel bars is lower. According to the regulation of the technical Standard for anti-floating of constructional engineering JGJ 476-2019: the anti-floating design grade is the first grade engineering, the design is carried out according to no crack, and the anchoring slurry body does not generate tensile stress under the standard combination of load effect; the anti-floating engineering with the design grade of B is designed according to crack control, and the tensile stress in the anchoring slurry body under the standard combination of load effect is not greater than the axial tensile strength of the anchoring slurry body. The conventional design method adopts HRB 400-grade twisted steel, and the problems are difficult to solve.
In the engineering field, an anti-floating anchor rod and an anti-floating pile are two different anti-floating structures.
The anti-floating anchor rod refers to an anti-pulling component which is anchored in a foundation and shares the buoyancy of underground water with an underground structure bottom plate. It has the following characteristics:
1. the anti-floating anchor rod can only be pulled but not pressed, so that the anti-floating anchor rod is a pure anti-pulling component, has very strong pertinence and is suitable for a tensile component;
2. the anti-floating anchor rod comprises anchor rod slurry (an anchor rod body 2) and an anchor rod rib body 3, wherein the anchor rod rib body 3 is arranged at the center of the anchor rod slurry and is not provided with other reinforcing steel bars (as shown in figure 1);
3. the diameter of the anti-floating anchor rod is smaller, and the common diameter is 150mm-200 mm;
4. the anchor rod construction machine is a drilling machine, so that the equipment is light and handy, the construction is convenient and fast, and the cost is low;
the anti-floating anchor pile refers to an anti-pulling component which is arranged in a foundation and shares the buoyancy of underground water or the load of an upper structure with an underground structure bottom plate. It is characterized in that:
the anti-floating anchor pile can bear water buoyancy and pressure of an upper structure. I.e. in tension and in compression;
the longitudinal steel bars and the stirrups need to be configured along the periphery, and the minimum reinforcement ratio of the longitudinal steel bars is not less than 0.2% -0.65%. If the pile needs to be provided with prestressed reinforcement for pulling resistance, additionally arranging prestressed pulling-resistance reinforcement at the center of the pile (as shown in figure 2);
the diameter of the pile is larger. Influenced by equipment or construction, the diameter of the long spiral pressure grouting pile is not less than 400mm, the diameter of the rotary excavating pile is not less than 600mm, and the diameter of the manual hole digging pile is not less than 800 mm; the construction machinery of the anti-floating anchor pile generally adopts a long spiral drilling machine and a rotary drilling machine, and has larger equipment and high cost.
In contrast, anti-floating anchors have a great advantage in terms of cost reduction. However, if a general post-tensioned pre-stressed anti-floating anchor rod process is adopted, after the construction of the basement bottom plate is completed, the basement bottom plate is taken as a tensioning end, and the following problems are caused:
1. tensioning can be carried out only after the construction of the basement bottom plate is finished and the corresponding strength is reached, so that the construction progress is greatly delayed;
2. and a tensioning channel needs to be reserved on the bottom plate for the post-tensioned prestressed steel bar, so that each anti-floating anchor rod can generate a tensioning hole at the corresponding position of the structural bottom plate. After tensioning is finished, high-pressure grouting is needed to be carried out on the tensioning holes, and a construction process and manufacturing cost are increased;
3. under the pressure action of underground water, the tensioning holes are easy to cause leakage, and the normal use of the basement is influenced;
4. stretching and anchoring end nodes are complex; the height of the node has an influence on the surface layer thickness of the basement, and the surface layer thickness of the basement bottom plate is increased.
Due to the problems, the post-tensioned pre-stressed anti-floating anchor rod is less applied in practical engineering.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem that exists in the application of current anti-floating anchor rod, the utility model provides an anti-floating structure of prestressed anchorage rod, concrete technical scheme as follows.
The utility model provides an anti structure that floats of prestressed anchorage pole, includes prestressed anchorage pole, bed course and basement bottom plate, the bed course is located basement bottom plate below, its characterized in that:
the prestressed anchor rod comprises an anchor rod body and a rib body positioned in the center of the anchor rod body, and a tensioning structure is arranged at the top end of the anchor rod body; the lower end of the rib body is fixed on the lower part of the anchor rod body, and the upper part of the anchor rod body is provided with a hollow cavity extending along the axis of the anchor rod body; the upper part of the rib body penetrates out of the hollow cavity and is fixedly connected with the tensioning structure, and a gap is formed between the hollow cavity and the rib body;
the top of the tensioning structure is also provided with an anchoring structure, the anchoring structure is positioned in the basement bottom plate, and the top of the rib body is fixedly connected with the anchoring structure.
Further, the tensioning structure comprises a first base plate and a first nut positioned on the first base plate; the anchoring structure comprises a second base plate and a second nut positioned on the second base plate.
By adopting the technical scheme, the first base plate and the first nut are used as a tensioning structure of the rib body, and a preset prestress is applied to the rib body, so that the anchor rod is ensured to be in a pressed state, and the anchor rod is prevented from cracking when the anti-floating effect is exerted; the second base plate and the second nut are used as an anchoring structure of the rib body in the basement bottom plate, so that the rib body, the anchor rod body and the basement bottom plate are fixedly connected together to play a role in resisting floating.
Further, the diameter of the anchor rod body is within the range of 100-300 mm. The diameter of the anti-floating anchor rod is small, construction can be carried out by adopting a drilling machine, equipment is light and handy, construction is convenient and fast, and cost is low.
Further, the hollow cavity is formed by placing a sleeve in the anchor rod body. Through setting up the sleeve, form the cavity in the upper portion of the stock body, the muscle body that is located the cavity is the free section of muscle body, provides the flexible space for the prestressing force stretch-draw of muscle body.
Furthermore, the bar body is made of PSB finish-rolled deformed steel bar. The PSB finish-rolled deformed steel bar has higher strength and better tensile property, and is beneficial to saving materials and manufacturing cost.
The utility model discloses compare and have following beneficial effect in prior art:
1. the tensile property of PSB finish rolling deformed steel bar is fully utilized, and the material and the manufacturing cost are saved;
2. the construction of the prestressed anchor rod is completed before the construction of the basement bottom plate, and a tensioning hole is not required to be formed in the basement bottom plate, so that the process intersection is reduced, and the construction progress is improved;
3. the construction process of reserving the tensioning holes on the basement bottom plate is avoided, and the high-pressure grouting of the tensioning holes is reduced;
4. the basement bottom plate can be poured as a whole, so that leakage caused by the stretching holes is avoided, and the later maintenance cost is reduced;
5. the top of the rib body of the prestressed anchor rod is arranged in the basement bottom plate, and the thickness of the surface layer of the basement bottom plate is not affected.
Drawings
FIG. 1 is a schematic cross-sectional view of an anti-floating anchor;
FIG. 2 is a schematic cross-sectional view of an anti-floating anchor pile;
FIG. 3 is a schematic view of the anti-floating structure of the prestressed anchor of the present invention;
fig. 4 is a schematic drawing of the prestressed anchor anti-floating structure of the present invention.
In the figure: basement bottom plate 1, the stock body 2, the muscle body 3, first backing plate 4, first nut 5, cavity 6, second backing plate 7, second nut 8, sleeve pipe 9, cavity hydraulic jack 10, cushion 11, bed course 12.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 3-4, the prestressed anchor anti-floating structure comprises a prestressed anchor, a cushion layer 12 and a basement bottom plate 1, wherein the cushion layer 12 is positioned below the basement bottom plate 1, the prestressed anchor comprises an anchor body 2 and a rib body 3 positioned in the center of the anchor body 2, and the rib body 3 adopts PSB finish-rolled deformed steel; the top end of the anchor rod body 2 is provided with a tensioning structure, the tensioning structure comprises a first base plate 4 and a first nut 5 positioned on the first base plate 4, and the first base plate 4 abuts against the top end of the anchor rod body 2; the lower end of the rib body 3 is fixed on the lower part of the anchor rod body 2, and the upper part of the anchor rod body 2 is provided with a hollow cavity 6 extending along the axis of the anchor rod body 2; the upper part of the rib body 3 penetrates out of the hollow cavity 6 and is fixedly connected with a first nut 5 of a tensioning structure, and a gap is formed between the hollow cavity 6 and the rib body 3;
the top of the tensioning structure is also provided with an anchoring structure, the anchoring structure comprises a second base plate 7 and a second nut 8 positioned on the second base plate 7, the second base plate 7 and the second nut 8 are positioned in the basement bottom plate 1, and the top of the rib body 3 is fixedly connected with the second nut 8 of the anchoring structure.
It should be noted that: the rib body 3 can also be made of other materials, such as steel strands, fiber reinforced materials and the like; the tensioning structure may also be another type of structure as long as it is possible to ensure sufficient prestressing of the prestressed anchor.
Preferably, the diameter of the bolt body 2 is in the range of 100 and 300 mm. The diameter of the anti-floating anchor rod is small, construction can be carried out by adopting a drilling machine, equipment is light and handy, construction is convenient and fast, and cost is low.
Preferably, the hollow cavity 6 is formed by placing a sleeve 9 in the bolt body 2. Through setting up sleeve 9, form the cavity in the upper portion of the stock body, the muscle body that is located the cavity is the free section of muscle body, provides the deformable space for the prestressing force stretch-draw of muscle body.
The utility model discloses a construction method of anti structure that floats of prestressed anchorage pole mainly includes following step:
1) constructing an anchor rod body 2 and a rib body 3 of the prestressed anchor rod, arranging a sleeve 9 at the upper part of the anchor rod body 2, and enabling the rib body 3 to penetrate out of the center of the sleeve;
2) the rib body 3 is prestressed and tensioned through a hollow hydraulic jack 10, the hollow hydraulic jack 10 is located between a first base plate 4 and a second base plate 7, the rib body 3 sequentially penetrates through the first base plate 4, a first nut 5, the hollow hydraulic jack 10, the second base plate 7 and a second nut 8, the top of the hollow hydraulic jack 10 abuts against the lower surface of the second base plate 7 (the second base plate 7 and the second nut 8 serve as tensioning counterforce structures), after the rib body 3 is prestressed and tensioned to the position through the hollow hydraulic jack 10, the first nut 5 is screwed and locked to prestress, the lower surface of the first base plate 4 abuts against the top end of the anchor rod body 2, and then the second nut 8, the second base plate 7 and the hollow hydraulic jack 10 are disassembled;
3) a second base plate 7 and a second nut 8 are arranged above the first nut 5, and the top end of the rib body 3 is fixedly connected with the second nut 8;
4) and constructing the basement bottom plate 1, and pouring the top end of the rib body 3, the second base plate 7 and the second nut 8 in the basement bottom plate 1.
Preferably, in the step 2), the hollow hydraulic jack 10 is supported on a cushion block 11, the lower surface of the cushion block 11 abuts against the upper surface of the first cushion plate 4, and the cushion block 11 is of a non-circular structure, for example, the cushion block 11 is a three-quarter circular ring (C-shaped cushion block), or three cushion blocks 11 arranged at intervals; through setting up cushion 11, when hollow hydraulic jack 10 stretch-draw put in place, the convenient operation of screwing up of first nut 5.
The embodiments of the present invention have been described above with reference to the accompanying drawings, and features of the embodiments and examples of the present invention may be combined with each other without conflict. The present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and the scope of the present invention, which is encompassed by the present invention.
Claims (5)
1. The utility model provides an anti structure that floats of prestressed anchorage pole, its includes prestressed anchorage pole, bed course and basement bottom plate, the bed course is located basement bottom plate below, its characterized in that:
the prestressed anchor rod comprises an anchor rod body and a rib body positioned in the center of the anchor rod body, and a tensioning structure is arranged at the top end of the anchor rod body; the lower end of the rib body is fixed on the lower part of the anchor rod body, and the upper part of the anchor rod body is provided with a hollow cavity extending along the axis of the anchor rod body; the upper part of the rib body penetrates out of the hollow cavity and is fixedly connected with the tensioning structure, and a gap is formed between the hollow cavity and the rib body;
the top of the tensioning structure is also provided with an anchoring structure, the anchoring structure is positioned in the basement bottom plate, and the top of the rib body is fixedly connected with the anchoring structure.
2. The prestressed anchor anti-floating structure of claim 1, wherein said tension structure comprises a first pad plate and a first nut disposed on the first pad plate; the anchoring structure comprises a second base plate and a second nut positioned on the second base plate.
3. The prestressed anchor anti-floating structure as claimed in claim 1, wherein said anchor rod body has a diameter in the range of 100-300 mm.
4. The prestressed anchor anti-floating structure as claimed in claim 1, wherein said hollow cavity is formed by placing a sleeve in said anchor body.
5. The prestressed anchor anti-floating structure as claimed in claim 1, wherein said tendon is made of PSB finish rolled deformed steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022611095.4U CN213773506U (en) | 2020-11-12 | 2020-11-12 | Anti structure of floating of prestressed anchorage pole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022611095.4U CN213773506U (en) | 2020-11-12 | 2020-11-12 | Anti structure of floating of prestressed anchorage pole |
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| CN213773506U true CN213773506U (en) | 2021-07-23 |
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| CN202022611095.4U Active CN213773506U (en) | 2020-11-12 | 2020-11-12 | Anti structure of floating of prestressed anchorage pole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112376627A (en) * | 2020-11-12 | 2021-02-19 | 中机国际工程设计研究院有限责任公司 | Prestressed anchor rod anti-floating structure and construction method thereof |
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2020
- 2020-11-12 CN CN202022611095.4U patent/CN213773506U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112376627A (en) * | 2020-11-12 | 2021-02-19 | 中机国际工程设计研究院有限责任公司 | Prestressed anchor rod anti-floating structure and construction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hunan Hongxing anti floating Engineering Technology Co.,Ltd. Assignor: CHINA MACHINERY INTERNATIONAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2021430000002 Denomination of utility model: A prestressed anchor rod anti floating structure Granted publication date: 20210723 License type: Exclusive License Record date: 20210128 |
|
| EE01 | Entry into force of recordation of patent licensing contract |