CN216515697U - Rock drilling anchor cable and bearing platform combined anti-seismic foundation - Google Patents
Rock drilling anchor cable and bearing platform combined anti-seismic foundation Download PDFInfo
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- CN216515697U CN216515697U CN202122496094.4U CN202122496094U CN216515697U CN 216515697 U CN216515697 U CN 216515697U CN 202122496094 U CN202122496094 U CN 202122496094U CN 216515697 U CN216515697 U CN 216515697U
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Abstract
The utility model discloses an anti-seismic foundation combining a rock drilling anchor cable and a bearing platform, which comprises the bearing platform for supporting a pier, the rock drilling anchor cable and a shear pile, wherein the rock drilling anchor cable is anchored in the bearing platform, the lower end of the rock drilling anchor cable is anchored on a rock stratum, the shear pile is arranged near the center of the bottom of the bearing platform, and the lower end of the shear pile is fixed in the rock stratum. The utility model meets the requirements of bending resistance, shearing resistance and overturning resistance of the foundation, and simultaneously can increase the shearing resistance bearing capacity of the foundation and reduce the excavation of the foundation pit and the masonry amount of concrete compared with the enlarged foundation and open caisson foundation; compared with a drilling pile foundation, the drilling construction difficulty can be reduced, the reaming phenomenon is not easy to occur, the construction time can be shortened, and the pile foundation is prevented from being pulled. The bearing platform bottom foundation has stronger bearing capacity, the foundation can provide enough compressive strength, the vertical component force of the rock drilling anchor cable can be used for offsetting the bending moment of the foundation generated by earthquake load, the horizontal component force can be used for offsetting partial horizontal shearing force generated by earthquake, and the rest horizontal shearing force is borne by the shear pile.
Description
Technical Field
The utility model belongs to the technical field of bridge structure buildings, and particularly relates to an anti-seismic foundation combining a rock drilling anchor cable and a bearing platform.
Background
At present, most of bridge foundations are drilled pile foundations, enlarged foundations, open caisson foundations, pipe column foundations and the like. In areas with higher foundation bearing capacity or exposed rocks, the enlarged foundation is often convenient to construct and has better economy, but when a bridge is positioned in a high-intensity seismic area, the bending moment of a foundation is larger, the enlarged foundation is often larger in size to meet the requirement of overturning resistance, cannot adapt to mountainous terrain, and meanwhile, the enlarged foundation is weaker in horizontal earthquake shearing force resistance, often depends on foundation lateral filling, and is insufficient in structural safety reserve.
In order to solve the problem of structural safety, open caisson foundations and pile foundations are often adopted to replace enlarged foundations in the design, and the open caisson scheme can cause a large amount of excavation of the mountain, is difficult to construct and high in construction cost and affects the stability of the existing mountain; the pile foundation scheme is adopted, drilling needs to be conducted on a hard rock stratum, the drilling difficulty is high, hole expansion is easy, and the situation that the part of the pile foundation is pulled under the action of an earthquake can occur.
Disclosure of Invention
The utility model is provided for solving the problems in the prior art, and aims to provide an anti-seismic foundation combining a rock drilling anchor cable and a bearing platform.
The technical scheme of the utility model is as follows: an anti-seismic foundation combining a rock drilling anchor cable and a bearing platform comprises the bearing platform for supporting a pier, the rock drilling anchor cable and a shear pile, wherein the rock drilling anchor cable is anchored in the bearing platform, the lower end of the rock drilling anchor cable is anchored in a rock stratum, the shear pile is further arranged near the center of the bottom of the bearing platform, and the lower end of the shear pile is fixed in the rock stratum.
The shear pile can be a single pile and is arranged at the center of the bottom of the bearing platform; the shear pile can also be arranged in a plurality of ways, and comprises a main shear pile positioned at the center of the bottom of the bearing platform and an auxiliary shear pile close to the center.
The bearing platform is a reinforced concrete member consisting of a spatial three-dimensional steel reinforcement framework and concrete, and the spatial three-dimensional steel reinforcement framework consists of bearing platform main reinforcements.
The spatial three-dimensional steel reinforcement framework is further used for positioning the anchor head of the rock drilling anchor cable.
The outer hoop steel sleeve of the shear pile is arranged outside the shear pile, and an associated structure associated with the bearing platform is further formed in the outer hoop steel sleeve of the shear pile.
The related structure comprises a through hole formed in the outer wall of the steel sleeve of the outer hoop of the shear pile, and the through hole facilitates effective penetration of a main reinforcement of the bearing platform.
The associated structure further comprises a steel sleeve steel bar connecting piece arranged at the position of the shear pile outer hoop steel sleeve, and the steel sleeve steel bar connecting piece is effectively connected with concrete in the bearing platform.
The bearing platform is in a quadrangular frustum pyramid shape, and the rock drilling anchor cable is parallel to the sidewall of the quadrangular frustum pyramid closest to the rock drilling anchor cable.
The utility model meets the requirements of bending resistance, shearing resistance and overturning resistance of the foundation, and simultaneously can increase the shearing resistance bearing capacity of the foundation and reduce the excavation of the foundation pit and the masonry amount of concrete compared with the enlarged foundation and open caisson foundation; compared with a drilling pile foundation, the drilling construction difficulty can be reduced, the reaming phenomenon is not easy to occur, the construction time can be shortened, and the pile foundation is prevented from being pulled.
The bearing platform bottom foundation has strong bearing capacity, the foundation can provide enough compressive strength, the vertical component of the rock drilling anchor cable can be used for offsetting the bending moment of the foundation generated by earthquake load, the horizontal component can be used for offsetting partial horizontal shearing force generated by earthquake, and the rest horizontal shearing force is borne by the shear pile.
The rock drilling anchor cable does not need to apply prestress, only needs to apply smaller tension to tighten the anchor cable, and greatly reduces the construction process and the construction difficulty.
Drawings
FIG. 1 is an elevational view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a plan view of the present invention;
FIG. 4 is a schematic view of excavation of a foundation pit according to the present invention;
FIG. 5 is a schematic illustration of the construction of shear piles and rock anchor line tunnels according to the present invention;
FIG. 6 is a schematic illustration of the installation of a rock bolt in accordance with the utility model;
FIG. 7 is a schematic view of the construction of the present invention for the positioning of the bearing platform reinforcing bars, steel sleeve connectors and anchor heads;
FIG. 8 is a schematic illustration of the construction of the present invention for placing concrete;
FIG. 9 is a schematic illustration of the construction of the backfilling of the foundation pit according to the present invention;
wherein:
1 bearing platform 2 rock drilling anchor cable
3 shearing-resistant pile 4 bearing platform main reinforcement
5 the shear pile outer hoop steel sleeve 6 steel sleeve steel bar connector.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1-9, an anti-seismic foundation with a combination of rock drilling anchor cables and a bearing platform comprises a bearing platform 1 for supporting a pier, rock drilling anchor cables 2 and shear piles 3, wherein the rock drilling anchor cables 2 are anchored in the bearing platform 1, the lower ends of the rock drilling anchor cables 2 are anchored in a rock stratum, the shear piles 3 are further arranged near the center of the bottom of the bearing platform 1, and the lower ends of the shear piles 3 are fixed in the rock stratum.
The shear pile 3 can be a single pile and is arranged at the center of the bottom of the bearing platform; the shear pile 3 may also be a plurality of arrangements, including a main shear pile located at the center of the bottom of the bearing platform and an auxiliary shear pile located near the center.
The bearing platform 1 is a reinforced concrete member consisting of a spatial three-dimensional steel reinforcement framework and concrete, and the spatial three-dimensional steel reinforcement framework consists of bearing platform main reinforcements 4.
The spatial three-dimensional steel reinforcement cage is also used for positioning the anchor head of the rock drilling anchor cable 2.
The outer portion of the shear pile 3 is provided with a shear pile outer hoop steel sleeve 5, and an associated structure associated with the bearing platform 1 is further formed in the shear pile outer hoop steel sleeve 5.
The associated structure includes a through hole formed at the outer wall of the shear pile outer hoop steel sleeve 5, which facilitates effective penetration of the cap main reinforcement 4.
The associated structure further comprises a steel sleeve steel bar connecting piece 6 arranged at the position of the shear pile outer hoop steel sleeve 5, and the steel sleeve steel bar connecting piece 6 is effectively connected with concrete in the cushion cap 1.
The bearing platform 1 is in a quadrangular frustum pyramid shape, and the rock drilling anchor cable 2 is parallel to the side wall of the nearest quadrangular frustum pyramid.
The main shear pile is located in the vertical projection range of the bridge pier, and the auxiliary shear pile is intersected with the vertical projection of the bridge pier.
The rock drilling anchor cable 2 is a steel strand, is a tension type anchor cable in a stress type, and is arranged along the outer edge of the bearing platform 1.
Five rock drilling anchor cables 2 are arranged on one side of the quadrangular frustum pyramid, and the rock drilling anchor cables 2 are arranged at equal intervals.
Yet another embodiment
The utility model provides an antidetonation formula basis of rock drilling anchor rope and cushion cap combination, is including cushion cap 1, the rock drilling anchor rope 2 and the shear pile 3 that support the pier, the inherent rock drilling anchor rope 2 of anchor in the cushion cap 1, rock drilling anchor rope 2 lower extreme anchors in the stratum, 1 bottom center near cushion cap still is provided with shear pile 3, shear pile 3's lower extreme is fixed in the stratum.
The shear pile 3 can be a single pile and is arranged at the center of the bottom of the bearing platform; the shear pile 3 may also be a plurality of arrangements, including a main shear pile located at the center of the bottom of the bearing platform and an auxiliary shear pile located near the center.
The bearing platform 1 is a reinforced concrete member consisting of a spatial three-dimensional steel reinforcement framework and concrete, and the spatial three-dimensional steel reinforcement framework consists of bearing platform main reinforcements 4.
The spatial three-dimensional steel reinforcement cage is also used for positioning the anchor head of the rock drilling anchor cable 2.
The outer portion of the shear pile 3 is provided with a shear pile outer hoop steel sleeve 5, and an associated structure associated with the bearing platform 1 is further formed in the shear pile outer hoop steel sleeve 5.
The associated structure includes a through hole formed at the outer wall of the shear pile outer hoop steel sleeve 5, which facilitates effective penetration of the cap main reinforcement 4.
The associated structure further comprises a steel sleeve steel bar connecting piece 6 arranged at the position of the shear pile outer hoop steel sleeve 5, and the steel sleeve steel bar connecting piece 6 is effectively connected with concrete in the cushion cap 1.
The bearing platform 1 is in a quadrangular frustum pyramid shape, and the rock drilling anchor cable 2 is parallel to the side wall of the nearest quadrangular frustum pyramid.
The main shear pile is located in the vertical projection range of the bridge pier, and the auxiliary shear pile is intersected with the vertical projection of the bridge pier.
The rock drilling anchor cable 2 is a steel pull rod, and is a stress type tension and compression dispersion type anchor cable which is arranged along the outer edge of the bearing platform 1.
Five rock drilling anchor cables 2 are arranged on one side of the quadrangular frustum pyramid, and the rock drilling anchor cables 2 are arranged at equal intervals.
The foundation pit is located above a rock stratum boundary.
The cushion layer is positioned at the bottom of the foundation pit.
A construction method of an anti-seismic foundation combining a rock anchor line and a bearing platform comprises the following steps:
excavation of foundation pit
Carrying out small-depth and small-gradient foundation pit excavation at the designed construction position to complete foundation pit construction;
(ii) shear pile construction
Drilling a hole at the bottom of the foundation pit in a small depth, installing an outer hoop steel sleeve 5 of the shear pile, and completing the construction of the shear pile 3;
(iii) Anchor Cable duct positioning and drilling
Positioning the hole passages of the rock drilling anchor cable 2 at the bottom of the foundation pit and completing drilling;
(iv) installing rock anchor cable
Installing a rock drilling anchor cable 2 in a drill hole, tightening the anchor cable, and performing mud jacking to finish the installation of the rock drilling anchor cable 2;
(v) construction bed course and three-dimensional steel reinforcement framework
Constructing bearing platform bottom cushion layer concrete and bearing platform main ribs 4, tensioning rock drilling anchor cables 2, and fixing anchor heads on the three-dimensional steel reinforcement frameworks; welding a steel sleeve steel bar connector 6 on the shear pile outer hoop steel sleeve 5;
(vi) placing concrete
Pouring concrete of the bearing platform 1 and part of piers;
(vii) Foundation ditch backfill
And backfilling the foundation pit to finish construction.
The shown foundation pit backfill can fully cover the cushion cap 1.
The utility model meets the requirements of bending resistance, shearing resistance and overturning resistance of the foundation, and simultaneously can increase the shearing resistance bearing capacity of the foundation and reduce the excavation of the foundation pit and the masonry amount of concrete compared with the enlarged foundation and open caisson foundation; compared with a drilling pile foundation, the drilling construction difficulty can be reduced, the reaming phenomenon is not easy to occur, the construction time can be shortened, and the pile foundation is prevented from being pulled.
The bearing platform bottom foundation has stronger bearing capacity, the foundation can provide enough compressive strength, the vertical component of the rock drilling anchor cable can be used for offsetting the bending moment of the foundation generated by earthquake load, the horizontal component can be used for offsetting partial horizontal shearing force generated by earthquake, and the rest horizontal shearing force is borne by the shear pile, so that the horizontal thrust resistance and the overturning resistance stability of the foundation can be greatly improved.
The rock drilling anchor cable does not need to apply prestress, only needs to apply smaller tension to tighten the anchor cable, and greatly reduces the construction process and the construction difficulty.
Claims (8)
1. The utility model provides an antidetonation formula basis of rock drilling anchor rope and cushion cap combination, includes cushion cap (1), rock drilling anchor rope (2) and shear pile (3) that support the pier, its characterized in that: the bearing platform is characterized in that a rock drilling anchor cable (2) is anchored in the bearing platform (1), the lower end of the rock drilling anchor cable (2) is anchored in a rock stratum, a shear pile (3) is further arranged near the center of the bottom of the bearing platform (1), and the lower end of the shear pile (3) is fixed in the rock stratum.
2. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 1, wherein: the shear pile (3) can be a single pile and is arranged at the center of the bottom of the bearing platform; the shear pile (3) can also be arranged in a plurality of ways, and comprises a main shear pile positioned at the center of the bottom of the bearing platform and an auxiliary shear pile close to the center.
3. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 1, wherein: the bearing platform (1) is a reinforced concrete member consisting of a spatial three-dimensional steel reinforcement framework and concrete, and the spatial three-dimensional steel reinforcement framework consists of bearing platform main reinforcements (4).
4. An earthquake-resistant foundation of a rock drill anchor line and cap combination as claimed in claim 3, wherein: the spatial three-dimensional steel reinforcement cage is also used for positioning the anchor head of the rock drilling anchor cable (2).
5. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 2, wherein: the shear pile is characterized in that a shear pile outer hoop steel sleeve (5) is arranged outside the shear pile (3), and an associated structure associated with the bearing platform (1) is further formed in the shear pile outer hoop steel sleeve (5).
6. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 5, wherein: the associated structure comprises a through hole formed in the outer wall of the shear pile outer hoop steel sleeve (5), and the through hole facilitates effective penetration of the main reinforcement (4) of the bearing platform.
7. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 5, wherein: the associated structure further comprises a steel sleeve steel bar connector (6) arranged at the position of the shear pile outer hoop steel sleeve (5), and the steel sleeve steel bar connector (6) is effectively connected with concrete in the bearing platform (1).
8. An earthquake-resistant foundation of a rock drill bolt and cap combination as claimed in claim 5, wherein: the bearing platform (1) is in a quadrangular frustum pyramid shape, and the rock drilling anchor cable (2) is parallel to the side wall of the nearest quadrangular frustum pyramid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122496094.4U CN216515697U (en) | 2021-10-18 | 2021-10-18 | Rock drilling anchor cable and bearing platform combined anti-seismic foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122496094.4U CN216515697U (en) | 2021-10-18 | 2021-10-18 | Rock drilling anchor cable and bearing platform combined anti-seismic foundation |
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| CN216515697U true CN216515697U (en) | 2022-05-13 |
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| CN202122496094.4U Active CN216515697U (en) | 2021-10-18 | 2021-10-18 | Rock drilling anchor cable and bearing platform combined anti-seismic foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114016534A (en) * | 2021-10-18 | 2022-02-08 | 中国铁路设计集团有限公司 | Rock drilling anchor cable and bearing platform combined anti-seismic foundation and construction method thereof |
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2021
- 2021-10-18 CN CN202122496094.4U patent/CN216515697U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114016534A (en) * | 2021-10-18 | 2022-02-08 | 中国铁路设计集团有限公司 | Rock drilling anchor cable and bearing platform combined anti-seismic foundation and construction method thereof |
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