CN211340802U - Combined supporting structure for viaduct bridge piles in subway foundation pit excavation adjacent area - Google Patents
Combined supporting structure for viaduct bridge piles in subway foundation pit excavation adjacent area Download PDFInfo
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- CN211340802U CN211340802U CN201921732247.7U CN201921732247U CN211340802U CN 211340802 U CN211340802 U CN 211340802U CN 201921732247 U CN201921732247 U CN 201921732247U CN 211340802 U CN211340802 U CN 211340802U
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Abstract
The utility model discloses a combined supporting structure of subway foundation pit excavation adjacent area overpass bridge piles, which comprises a bridge pier bearing platform and bridge piles supported below the bridge pier bearing platform, wherein vertical jet grouting piles are arranged outside the bridge piles, and the jet grouting piles surround the outside of the bridge pier bearing platform to form inner ring supporting; vertical sleeve valve pipes are pre-embedded outside the bridge piles, and surround the jet grouting piles to form outer ring support; the pier cushion cap is close to the lateral upper side of the subway station foundation pit, a foundation pit continuous wall is arranged on the outer side of the subway station foundation pit, and the pier cushion cap and the foundation pit continuous wall are fixedly connected through reinforced concrete slabs. The utility model discloses a structure has improved jet grouting pile's shear resistance and bearing capacity, has still provided interior inside and outside dual support, realizes effectively consolidating the stratum, and then guarantees the long-term steadiness of bridge pile and pier.
Description
Technical Field
The utility model relates to a construction field of subway station foundation ditch, concretely relates to subway station pit excavates joint supporting construction of adjacent region overpass bridge pile.
Background
With the rapid development of economy and science and technology and the continuous promotion of urbanization in China, the demand of cities in China for subways and viaducts is increasing day by day. In the subway construction process, the excavation of the subway station foundation pit can generate stress disturbance on the bridge piles of the adjacent viaducts, so that the bridge piles and the bridge piers are easy to damage, and the long-term stability of the viaducts is influenced. The foundation pit excavation changes the stress environment of the adjacent bridge piles, reduces the lateral soil pressure of the soil body to the bridge piles, and leads the soil body around the bridge piles to be settled, thereby reducing the vertical bearing capacity of the bridge piles. In addition, the lateral displacement of the soil body can generate horizontal additional force on the bridge pile, and the stability of the bridge pile is weakened. Therefore, the support of the viaduct bridge piles becomes a difficult problem in excavation of the foundation pit of the subway station in partial areas of China.
For the influence condition of excavation of a subway station foundation pit on a viaduct bridge pile, the current engineering industry adopts some measures to support the bridge pile. For example, the elevated bridge piles are reinforced by grouting around the bridge piles by using separate jet grouting piles or sleeve valve pipes, and the bridge piles are reinforced by using methods such as steel plate reinforcement. The independent jet grouting pile grouting is inconvenient to supplement grouting when the bridge degeneration is abnormal in subway construction, and the effect of permanently supporting the bridge pile cannot be achieved due to the fact that the carrying capacity of the independent sleeve valve pipe is too small. Therefore, these reinforcing and supporting measures have certain limitations.
SUMMERY OF THE UTILITY MODEL
Problem to above-mentioned prior art exists, the utility model provides a subway foundation pit excavates joint supporting structure of adjacent region overpass bridge pile can show the ability of shearing that improves the soil body around the bridge pile, effectively reduces the stress disturbance that foundation ditch excavation produced the overpass bridge pile to improve the bearing capacity of bridge pile, guarantee the long-term steadiness of overpass.
In order to achieve the above object, the utility model adopts the following technical scheme: a combined supporting structure for viaduct bridge piles in an adjacent area of a subway foundation pit excavation comprises a bridge pier bearing platform and bridge piles supported below the bridge pier bearing platform, wherein vertical jet grouting piles are arranged on the outer sides of the bridge piles, and the jet grouting piles surround the outer sides of the bridge pier bearing platform to form inner ring supporting; vertical sleeve valve pipes are pre-embedded outside the pier bearing platform, and surround the jet grouting piles to form outer ring support; the pier cushion cap is close to the lateral upper side of the subway station foundation pit, a foundation pit continuous wall is arranged on the outer side of the subway station foundation pit, and the pier cushion cap and the foundation pit continuous wall are fixedly connected through reinforced concrete slabs.
Further, spout stake inside steel reinforcement cage soon, steel reinforcement cage sinks to spouting soon through leading positive mechanism in, lead positive mechanism including leading positive pole, the hammer that shakes and lead positive pole nozzle, lead positive pole nozzle and install in the head of leading positive pole, and lead positive pole nozzle and be located and spout stake bottom soon, lead the afterbody and the thick liquid pumping installations of positive pole, lead positive pole and spray grout to spouting soon in the stake, shake hammer fixed mounting at steel reinforcement cage's top. The slurry and the air flow are sprayed by the guide rod and guide rod nozzles, so that a local cavity is formed at the end of the reinforcement cage by the slurry center of the rotary jet pile which is not condensed, the resistance of the end of the reinforcement cage is reduced, and the reinforcement cage continuously descends along the slurry center under the pressure action of the vibration hammer until reaching a specified position.
Further, the reinforcement cage is arranged vertically.
Further, the distances between the adjacent jet grouting piles are equal; the distance between the adjacent sleeve valve tubes is equal.
Further, the sleeve valve pipe is hollow, and is not grouted when being pre-buried, and is used as a supplementary grouting structure.
Furthermore, the reinforced concrete block is provided with a reinforcement cage and is formed by pouring C25 concrete.
The invention has the beneficial effects that:
1. the utility model discloses a built-in steel reinforcement cage's jet grouting pile supporting construction compares with ordinary jet grouting pile, has improved jet grouting pile's shear resistance and bearing capacity, realizes effectively consolidating the stratum, and then guarantees the long-term steadiness of bridge pile and pier.
2. The utility model discloses a shake the hammer and lead in the positive pole leads-in spouting the stake soon with the steel reinforcement cage, guarantee that the steel reinforcement cage can follow and spout a decline soon to last decline and reach and spout stake end assigned position soon.
3. The utility model discloses a sleeve valve pipe reserves and supplements the slip casting structure, and the bridge warp when unusual during the subway station foundation ditch excavation of being convenient for complements the slip casting and consolidates the bridge pile to guarantee the stability of bridge.
4. The utility model discloses pour reinforced concrete slab between pier cushion cap and station foundation ditch diaphragm wall, carry out the side direction restraint to the bridge pile, therefore improved the steadiness of bridge pile, can prevent the water between bridge pile and the foundation ditch diaphragm wall to ooze down simultaneously, avoid the soil body to soften and lead to the fact the influence to the bridge pile.
5. The utility model discloses a supporting construction is united with sleeve valve pipe to neighbouring foundation ditch pier to jet grouting pile, forms the dual supporting construction of inner circle and outer lane, can effectively consolidate the soil body around the bridge pile to can reduce the stress disturbance that excavation of foundation ditch produced the bridge pile of viaduct, guarantee the long-term steadiness of viaduct. The supporting structure has strong applicability in the aspect of protecting the viaduct in the area adjacent to the excavation of the subway station foundation pit.
Drawings
Fig. 1 is a schematic cross-sectional view of a combined supporting structure of a jet grouting pile and a sleeve valve pipe of the utility model for a bridge pile;
fig. 2 is a schematic top view of the combined supporting structure of the jet grouting pile and the sleeve valve pipe of the utility model for the bridge pile;
fig. 3 is a schematic perspective view of the rotary jet pipe supporting structure with a built-in steel reinforcement cage of the present invention;
fig. 4 is the utility model discloses a section schematic diagram of the jet grouting pipe supporting construction of built-in steel reinforcement cage.
In the figure: 1. pier cushion cap, 2, bridge piles, 3, jet grouting piles, 4, sleeve valve pipes, 5, reinforced concrete slabs, 6, foundation pit continuous walls, 7, subway station foundation pits, 8, reinforcement cages, 9, guide rods, 10, vibration hammers, 11, guide rod nozzles, 12 and a slurry pumping device.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a combined supporting structure for a subway station foundation pit excavation adjacent area viaduct bridge pile comprises a pier bearing platform 1 and two bridge piles 2 supported at the bottom of the pier bearing platform 1, wherein the pier bearing platform 1 is located above the side of a subway station foundation pit 7, a foundation pit continuous wall 6 for protecting the subway station foundation pit 7 is built on the outer side of the subway station foundation pit 7, the pier bearing platform 1 and the subway station foundation pit 7 are connected through a reinforced concrete plate 5, and the bridge piles 2 are laterally restrained and water permeation between the bridge piles 2 and the foundation pit continuous wall 6 is prevented; as shown in fig. 2, vertical jet grouting piles 3 are respectively arranged on the outer sides of the pier bearing platform 1 in a surrounding manner, the jet grouting pipes 3 surround the pier bearing platform 1 and the bridge piles 2, the distance between every two adjacent jet grouting piles 3 is equal, and the jet grouting piles 3 form an inner ring supporting structure; the utility model discloses a subway station foundation ditch 7 excavation process, including pier cushion cap 1, sleeve valve pipe 4, the operation of filling slurry is carried out to hollow sleeve valve pipe 4 in the outside of pier cushion cap 1 still pre-buried, does not carry out the slip casting operation to sleeve valve pipe 4 in the pre-buried period, treats that the bridge deformation is unusual during later stage subway station foundation ditch 7 is opened out, carries out the operation of filling slurry again, sleeve valve pipe 4 encircles pier cushion cap 1 and surrounds all jet grouting piles 3 and forms outer lane supporting construction, and inner circle supporting construction and outer lane supporting construction form dual supporting construction, can prevent effectively that the soil body from becoming flexible, guarantee subway station foundation ditch 7.
As shown in fig. 3 and 4, pile 3 is inside to be provided with vertical steel reinforcement cage 8 soon, steel reinforcement cage 8 sinks into and spouts stake 3 soon through being located the inside mechanism of leading of spouting soon stake 3, lead just the mechanism including leading positive pole 9, shake hammer 10 and leading positive pole nozzle 11, lead positive pole nozzle 11 and install in leading the head of positive pole 9, and lead positive pole nozzle 11 and be located spout soon 3 bottoms, lead the afterbody and the thick liquid pumping device 12 of positive pole 9 and be connected, lead positive pole 9 and spout grout to spouting soon in stake 3, shake hammer 10 fixed mounting at the top of steel reinforcement cage 8.
The utility model discloses the concrete implementation process as follows:
(1) and drilling grouting holes at equal intervals around the pier bearing platform 1, and then performing grouting operation in the drilled holes by adopting triple jet grouting equipment.
(2) Before the slurry is finally set, a vibration hammer 10 with a guide rod 9 is connected with a reinforcement cage 8 and arranged at the pile top of the jet grouting pile 3. And then starting a slurry pumping device 12, enabling a guide rod nozzle 11 to spray high-pressure cement slurry and air flow, enabling the center of the liquid level of the jet grouting pile 3 to form a cavity, and enabling the periphery of the slurry level to suspend, so that the reinforcement cage 8 continuously descends along the axis of the jet grouting pile 3 under the pressure action of a vibration hammer 10, and finally reaches a specified position.
(3) The sleeve valve pipes 4 are vertically arranged around the jet grouting piles 3 in an evenly-spaced mode, the sleeve valve pipes 4 are not grouted in the initial stage, and the jet grouting device is used as a supplementary grouting device for bridge piles 2 in the excavation process of a subway station foundation pit 7 in the later stage.
(4) And pouring a reinforced concrete slab 5 between the foundation pit continuous wall 6 and the pier bearing platform 1 to tightly connect the foundation pit continuous wall 6 and the pier bearing platform 1 of the viaduct.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.
Claims (5)
1. A combined supporting structure of a viaduct bridge pile in an adjacent area excavated by a subway foundation pit comprises a pier bearing platform (1) and a bridge pile (2) supported below the pier bearing platform (1), and is characterized in that a vertical jet grouting pile (3) is arranged on the outer side of the bridge pile (2), and the jet grouting pile (3) surrounds the outer side of the pier bearing platform (1) to form an inner ring support; vertical sleeve valve pipes (4) are embedded in the outer side of the bridge piles (2), and the sleeve valve pipes (4) surround the jet grouting piles (3) to form outer ring support; pier cushion cap (1) is close to the side top of subway station foundation ditch (7), subway station foundation ditch (7) outside is provided with foundation ditch diaphragm wall (6), through reinforced concrete slab (5) fixed connection between pier cushion cap (1) and foundation ditch diaphragm wall (6).
2. The combined supporting structure of the viaduct bridge piles in the vicinity of the subway foundation pit excavation of claim 1, wherein: spout stake (3) inside steel reinforcement cage (8) soon, steel reinforcement cage (8) sink into spout stake (3) soon through leading positive mechanism in, lead positive mechanism including leading positive pole (9), shake hammer (10) and lead positive pole nozzle (11), lead positive pole nozzle (11) and install in leading positive pole (9) head, and lead positive pole nozzle (11) and be located spout stake (3) bottom soon, lead the afterbody and the thick liquid pumping installations (12) of positive pole (9) and be connected, lead positive pole (9) and spray grout to spouting stake (3) soon in, shake hammer (10) fixed mounting in the top of steel reinforcement cage (8).
3. The combined supporting structure of the viaduct bridge piles in the vicinity of the subway foundation pit excavation of claim 2, wherein: the reinforcement cage (8) is vertically arranged.
4. The combined supporting structure of the viaduct bridge piles in the vicinity of the subway foundation pit excavation of claim 1, wherein: the distances between the adjacent jet grouting piles (3) are equal; the distance between the adjacent sleeve valve tubes (4) is equal.
5. The combined supporting structure of the viaduct bridge piles in the vicinity of the subway foundation pit excavation of claim 1, wherein: the sleeve valve pipe (4) is hollow and is not grouted when being pre-buried, and is used as a supplementary grouting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921732247.7U CN211340802U (en) | 2019-10-16 | 2019-10-16 | Combined supporting structure for viaduct bridge piles in subway foundation pit excavation adjacent area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921732247.7U CN211340802U (en) | 2019-10-16 | 2019-10-16 | Combined supporting structure for viaduct bridge piles in subway foundation pit excavation adjacent area |
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| CN211340802U true CN211340802U (en) | 2020-08-25 |
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| CN201921732247.7U Active CN211340802U (en) | 2019-10-16 | 2019-10-16 | Combined supporting structure for viaduct bridge piles in subway foundation pit excavation adjacent area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235612A (en) * | 2021-05-17 | 2021-08-10 | 中铁二十四局集团有限公司 | Deep foundation pit supporting construction method for soft soil foundation high-pressure-bearing water environment adjacent to high-speed rail |
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2019
- 2019-10-16 CN CN201921732247.7U patent/CN211340802U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235612A (en) * | 2021-05-17 | 2021-08-10 | 中铁二十四局集团有限公司 | Deep foundation pit supporting construction method for soft soil foundation high-pressure-bearing water environment adjacent to high-speed rail |
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