CN214460568U

CN214460568U - Bridge steel pipe support foundation on bedding rock face

Info

Publication number: CN214460568U
Application number: CN202120398276.5U
Authority: CN
Inventors: 王冬恒; 危志豪; 严少发; 魏刚; 毛志刚; 翟海彬; 南维州; 姬东东
Original assignee: CCCC First Highway Engineering Co Ltd
Current assignee: CCCC First Highway Engineering Co Ltd
Priority date: 2020-04-03
Filing date: 2021-02-23
Publication date: 2021-10-22
Anticipated expiration: 2031-02-23

Abstract

The utility model discloses a bridge steel pipe support basis on bedding rock face relates to support basis technical field. This bridge steel pipe support basis includes the cushion cap on the bedding rock face, the top pin joint of cushion cap has miniature stake, the bottom fixed mounting of cushion cap has the steel pipe, the bottom fixed mounting of cushion cap has the cable, the concrete has been pour to the inside of miniature stake, there is branch inside of concrete through connector fixed mounting. The method is characterized in that the top of a main reinforcement is pre-bent in advance before binding of a bearing platform reinforcement so as to enhance the reinforcement anchoring capability and the bearing platform anti-cutting capability, tension force is applied to steel strands by using a jack according to the principle of an anchor cable frame beam, whether the stress condition of a micro-pile is consistent with the calculation or not is verified, and micro-pile drilling construction is performed by adopting seamless steel tube follow-up, so that the micro-pile is not inclined on the bedding rock face and is formed into a complete pile without hole collapse, a good effect is obtained on a complex marble stratum, the applicability of the micro-pile of the complex marble stratum is verified, and the method is simple, economical and convenient.

Description

Bridge steel pipe support foundation on bedding rock face

Technical Field

The utility model relates to a support foundation technical field, very much be a bridge steel pipe support basis on bedding rock face.

Background

And (3) generating a slide-resistant pile foundation: the load is transferred to a stable rock stratum through the bearing capacity of the pile, and the pile forming mode comprises two modes of manual hole digging and mechanical hole drilling.

1. The manual hole digging is high in safety risk and low in pile forming efficiency, and rock face loosening is easily caused by blasting excavation of initiating explosive devices.

2. The construction period of mechanical hole forming is long, large-scale equipment is required to be matched for construction, the requirement on the site is strict, the construction cost is high, and the construction is not economical.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bridge steel pipe support basis on consequent layer rock face should solve the problem among the above-mentioned background art.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a bridge steel pipe support basis on consequent layer rock face, includes the cushion cap, the top pin joint of cushion cap has miniature stake, the bottom fixed mounting of cushion cap has the steel pipe, the bottom fixed mounting of cushion cap has the cable, the inside of miniature stake is pour has the concrete, there is branch inside of concrete through connector fixed mounting.

The utility model provides a bridge steel pipe support basis on bedding rock face. The method has the following beneficial effects:

the bridge steel pipe support foundation on the bedding rock surface has the advantages that the bearing platform has good steel bar anchoring capability and anti-cutting capability; the steel pipe can follow up to carry out micro-pile drilling construction, so that the micro-pile is not inclined on the bedding rock surface and the pile is formed completely without hole collapse; the guy cable is used for stabilizing the whole bracket foundation; the mini-pile has the characteristics of less material consumption of a single pile, convenience in construction and the like, the concrete and the supporting rod are arranged inside the mini-pile, a good effect can be achieved on a complex compound marble stratum, the applicability on the compound marble stratum is strong, and the mini-pile is simple, economical and convenient. The utility model discloses simple and convenient, it is convenient to use, has economic value and social value well.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the operation steps of S2 of the present invention;

fig. 3 is a schematic diagram of the operation steps of S3 according to the present invention;

fig. 4 is a schematic diagram of the operation of S4 of the present invention;

fig. 5 is a schematic diagram of the operation steps of S5 according to the present invention.

In the figure: 1. a steel pipe; 2. a bearing platform; 3. micro-piles; 4. a cable; 5. concrete; 6. a strut; 7. a connecting head.

Detailed Description

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a bridge steel pipe support basis on consequent layer rock face, includes cushion cap 2, the top pin joint of cushion cap 2 has miniature stake 3, the bottom fixed mounting of cushion cap 2 has steel pipe 1, the bottom fixed mounting of cushion cap 2 has cable 4, the inside of miniature stake 3 is pour and has concrete 5, there is branch 6 inside of concrete 5 through connector 7 fixed mounting.

A bridge foundation treatment method on bedding rock surface comprises the steps that the load of stand columns on the upper portion of a support is distributed to micro piles through a bearing platform 2, then the micro piles are transmitted to a stable foundation rock through the micro piles 3, on the other hand, the micro piles 3 are in pin connection and series connection, the effect of soil retaining and skid resisting reinforcement on an unstable slope can be achieved, and the method comprises the following operation steps:

s1, operation before hole forming: and (4) measuring and lofting, building a platform according to the size of the bearing platform, and draining water around.

S2, anchor cable hole drilling: the down-the-hole drill is adopted to operate according to a designed position, the hole diameter of the drilled holes is 10cm-20cm, the distance is 1-2m, the holes are arranged in a quincuncial shape, specific parameters are determined according to calculation, in the implementation process, the holes are drilled in a batch and jump drilling method, the influence of the drilled holes on the overall stability of a rock stratum is avoided, the length of the steel pipe is +10cm, the diameter of the steel pipe is generally smaller than the hole diameter of 1-2cm, grout outlet holes with the diameter of 2cm are reserved at the bottom, and the holes are drilled in a seamless steel pipe follow-up mode to ensure the hole forming effect.

S3, lowering an anchor cable, and grouting: the steel reinforcement cage owner muscle, splice bar are that the back field is processed into wholly, adopt to lift by crane equipment and once only transfer to in the seamless steel pipe, during the slip casting, the slip casting pipe stretches into the hole bottom, and the thick liquid ratio should be slow with prestressing tendons pipeline thick liquid, and the slip casting is gone on in grades, guarantees downthehole and rock crack slurry is abundant.

S4, installing a tension reaction beam and an anchorage device: and (3) carrying out bearing platform construction, wherein the construction is carried out on a conventional reinforced concrete structure, the top of the main reinforcement is pre-bent in advance before reinforcing steel bars are bound, so that the anchoring capability of the reinforcing steel bars and the punching resistance of the bearing platform are enhanced, and related embedded parts are embedded according to the design position before concrete pouring.

S5, load application: and (3) applying a tensile force F to the steel strand by using a jack, transmitting the tensile force F to the bearing platform through the tension counter-force beam, and anchoring the anchor cable on the bearing layer under the micro-pile so as to simulate the stress.

S6, hold load, observe data: and observing foundation settlement, foundation deformation and slope slippage.

And S7, unloading.

The method of the examples was performed for detection analysis and compared to the prior art to yield the following data:

according to above-mentioned table data can derive, when the embodiment, through the utility model discloses bridge steel pipe support basis and processing method acquisition parameter are reinforcing bar anchoring ability and the anti die-cut ability of cushion cap on the bedding rock face: and (3) the state of the micro pile on the bedding rock face is strong: no inclination, no hole collapse, economy: is simple, economical and convenient.

The utility model provides a, bridge steel pipe support basis on bedding rock face, including cushion cap 2, cushion cap 2's top pin joint has miniature stake 3, cushion cap 2's bottom fixed mounting has steel pipe 1, a bridge foundation treatment method on bedding rock face, including support upper portion stand load, distribute to miniature stake 3 through cushion cap 2, then transmit to on stabilizing the basement rock by miniature stake, on the other hand, miniature stake pin joint series effect can play the anti-skidding reinforcing action of fender soil to unstable slope, and its operating procedure has following step: s1, operation before hole forming: and (4) measuring and lofting, building a platform according to the size of the bearing platform, and draining water around. S2, anchor cable hole drilling: the method is characterized in that a down-the-hole drill is adopted to operate according to a designed position, the hole diameter of the drilled holes is 10cm-20cm, the distance is 1-2m, the holes are arranged in a quincuncial shape, specific parameters are determined according to calculation, in the implementation process, the drilling method is carried out in batches and in a jump drilling mode, the influence of the drilling on the overall stability of a rock stratum is avoided, the length of a steel pipe is +10cm, the diameter is generally smaller than the hole diameter of 1-2cm, a grout outlet hole with the diameter of 2cm is reserved at the bottom, in order to guarantee the hole forming effect, the holes are drilled in a seamless steel pipe follow-up mode, micro-pile drilling construction is carried out in the seamless steel pipe follow-up mode, and the micro-piles are guaranteed not to incline along the rock surface and not to collapse completely. S3, lowering an anchor cable, and grouting: the steel reinforcement cage owner muscle, splice bar are that the back field is processed into wholly, adopt to lift by crane equipment and once only transfer to in the seamless steel pipe, during the slip casting, the slip casting pipe stretches into the hole bottom, and the thick liquid ratio should be slow with prestressing tendons pipeline thick liquid, and the slip casting is gone on in grades, guarantees downthehole and rock crack slurry is abundant. S4, installing a tension reaction beam and an anchorage device: the cushion cap construction is with conventional reinforced concrete structure thing construction, carries out the preflex to main muscle top before the reinforcement to reinforcing bar anchoring ability and cushion cap die-cut resistance ability, before the concreting, according to the pre-buried relevant built-in fitting of design position, carries out the preflex to main muscle top before the cushion cap reinforcement in advance before the cushion cap reinforcement, so that reinforcing bar anchoring ability and cushion cap die-cut resistance ability. S5, load application: the tensioning force F is applied to the steel strand by the jack and transmitted to the bearing platform through the tensioning reaction beam, the anchor cable is anchored on the bearing layer under the micro-pile, so that the effect of simulating stress is achieved, and according to the principle of the anchor cable frame beam, the tensioning force is applied to the steel strand by the jack, and whether the stress condition of the micro-pile is consistent with the calculation or not is verified. S6, hold load, observe data: and observing foundation settlement, foundation deformation and slope slippage. S7, unloading, adopting the micro-pile foundation treatment on the complex compound marble stratum for the first time, obtaining good effect on the complex compound marble stratum, verifying the applicability of the micro-pile of the compound marble stratum, and being simple, economical and convenient.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.

Claims

1. The utility model provides a bridge steel pipe support basis on bedding rock face, includes cushion cap (2), its characterized in that: the top pin joint of cushion cap (2) has miniature stake (3), the bottom fixed mounting of cushion cap (2) has steel pipe (1), the bottom fixed mounting of cushion cap (2) has cable (4), the internally cast of miniature stake (3) has concrete (5), the inside of concrete (5) has branch (6) through connector (7) fixed mounting.