CN112962584A

CN112962584A - Expandable anti-slide pile and construction method thereof

Info

Publication number: CN112962584A
Application number: CN202110179190.8A
Authority: CN
Inventors: 高玉峰; 舒爽; 刘凌霄; 张飞
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-06-15

Abstract

The invention provides a telescopic slide-resistant pile and a construction method thereof, wherein the slide-resistant pile is formed by pouring concrete on a steel bar base frame, wherein the steel bar base frame comprises a central shaft, a support frame and vertical outer wall steel bars, the support frame is sleeved on the central shaft and comprises a plurality of support rods, and the support frame is in an umbrella shape after being unfolded; the end of each supporting rod is connected with a vertical outer wall steel bar, and after the supporting frame is unfolded, all the vertical outer wall steel bars form a steel bar cage which is coaxial with the central shaft. Compared with the prior art, the steel bar base frame of the slide-resistant pile can be unfolded and contracted, so that the slide-resistant pile is convenient to prefabricate in advance, transport and install, the construction safety is guaranteed, the construction period is shortened, and the cost is saved.

Description

Expandable anti-slide pile and construction method thereof

Technical Field

The patent relates to the field of slope reinforcement, in particular to a manufacturing method of a slide-resistant pile and a construction method for preventing and treating landslide by using the slide-resistant pile.

Background

Different regions are distributed with soil environments with different engineering properties, so that thousands of slopes with potential landslide risks to be treated, which are formed by natural environment accumulation and human activities, inevitably exist, and the life and property safety of people is influenced. Most of the existing slope treatment means are complex and heavy, taking slide-resistant piles as an example, the slide-resistant piles penetrate through a landslide body and go deep into a slide bed to support and block the sliding force of the landslide body and play a role in stabilizing the slope, are suitable for the landslide of shallow layers and medium and thick layers, and are one of the main measures of the slide-resistant treatment. The hole digging antiskid piles are constructed by adopting a manual hole digging method, and the piles are alternately jumped and dug and cannot be subjected to groove construction. The hole digging pile has the advantages of more input labor force, simple construction machinery, higher labor intensity and important safety construction. The construction process comprises the steps of shaft line pile positioning, field leveling, fore shaft beam construction, pile retaining wall, pile hole excavation, reinforcement cage manufacturing and installation, pile body concrete pouring, inter-pile baffle pouring and the like. The anti-slide pile reinforcement cage can be installed in a hole or hoisted after being installed in advance, and for the anti-slide pile with a larger diameter, because the reinforcement configuration is more and the size is larger, the transportation and hoisting are difficult after being manufactured in advance, and the method of installing in the hole is mostly adopted at present. The unstable soil body of side slope can cause the disturbance of to a great extent at pile construction process, and downthehole system is installed construction speed slowly in addition, and long-time construction and the instability of side slope make constructor's safety difficult to guarantee, and this process can produce comparatively high construction cost. Aiming at a small-diameter cast-in-situ bored pile with the pile diameter of 70-500mm, the length-fineness ratio is larger, only light construction machines are needed during construction, the pile position arrangement is flexible, the construction speed is high, the adaptability to a construction site is strong, the influence on the environment is small, the application of the current micro slide-resistant pile in the engineering is more and more extensive, one of the current mainstream square reinforcement cages needs to be bound on site, and the most important factor is that the volume is not flexible, so that the whole slide-resistant pile has a constant cross section from head to tail no matter the length of a pile body, and if the slide-resistant pile needs to be reinforced, under the condition that the depth of a side slope is larger, the construction difficulty and the disturbance to the slope are caused.

Meanwhile, the conventional anti-slide piles mainly comprise rectangular piles and circular piles according to the cross section forms, and the anti-slide piles with the two cross section forms have the advantages and the disadvantages, such as better anti-bending effect of the rectangular piles, low construction speed of pile hole excavation and difficulty in guaranteeing the safety of constructors; although the circular pile can be formed by high-efficiency machinery, compared with the rectangular pile, the circular pile with the same cross section area has poorer bending resistance effect, and if the bending resistance effect is required to be achieved, the cross section area of the circular pile is much larger than that of the rectangular pile.

Therefore, an anti-slide pile is urgently needed, which can further ensure the safety of constructors, shorten the construction time and reduce the construction cost on the premise of ensuring the anti-bending effect of the anti-slide pile.

Disclosure of Invention

The invention aims to provide a telescopic slide-resistant pile and a construction method of the slide-resistant pile. On the premise of ensuring the anti-bending effect, the construction time is shortened, the construction cost is reduced, and the construction safety is improved.

The invention provides a telescopic slide-resistant pile which is formed by pouring concrete or cement soil on a steel bar base frame, wherein the steel bar base frame comprises a central shaft, a support frame and vertical outer wall steel bars, the support frame comprises a plurality of support rods, the support frame is sleeved on the central shaft, and the support frame is in an umbrella shape after being unfolded; the end of each supporting rod is connected with a vertical outer wall steel bar, and all the vertical outer wall steel bars form a steel bar cage after the supporting frame is unfolded. At this moment, the quantity of bracing piece is the same with the quantity of vertical outer wall reinforcing bar, and the bracing piece rotates with vertical outer wall reinforcing bar to be connected, and the steel reinforcement cage that forms is coaxial with the center pin, and the center pin is similar to the umbrella stick, and the support frame is similar to the umbelliform after strutting, and the bracing piece is equivalent to the rib, and vertical outer wall reinforcing bar is around "umbrella" round.

The reinforcing bar bed frame is prefabricated by the mill, and its support frame is the structure that can strut and contract like the umbrella, is in the shrink state before transporting to the construction ground, according to the structure size, can select to strut the reinforcing bar bed frame before transferring to the stake hole or after transferring to appointed stake hole position, puts into the stake hole and struts chucking behind the support frame, keeps outer wall reinforcing bar and the laminating of stake hole wall, and the diameter of the steel reinforcement cage that forms promptly equals with the internal diameter in stake hole. The length of the steel reinforcement cage, the expansion range of the supporting rods and the cross-sectional shape, the model and the size of the vertical outer wall steel reinforcement can be flexibly adjusted according to different on-site engineering design requirements. Preferably, the method is more suitable for the small-diameter cast-in-place pile with the pile diameter of 70-500 mm.

Furthermore, each slide-resistant pile is provided with a plurality of groups of supporting frames, each group of supporting frames are arranged in parallel from top to bottom, the supporting rods of the upper group of supporting frames are parallel to the supporting rods of the lower group of supporting frames in a one-to-one correspondence mode, and the tail ends of the supporting rods corresponding to each vertical direction from top to bottom are connected with the same vertical outer wall reinforcing steel bar. Thus being beneficial to improving the overall stability after the support frame is unfolded.

Furthermore, each anti-slide pile is provided with two groups of support frames, the two groups of support frames are reversely connected with the central shaft, and two ends of each vertical outer wall reinforcing steel bar are simultaneously connected with the support rods on the two corresponding groups of support frames. After two sets of support frames are opened, two opposite umbrella-shaped structures are formed, the stability of the vertical outer wall reinforcing steel bars is further improved, and meanwhile, after concrete is poured, the bending resistance effect of the slide-resistant pile is enhanced.

Furthermore, the support frame also comprises a movable clamping polymerizer, the movable clamping polymerizer is connected with the central shaft, and the support rods are dispersedly arranged around by taking the movable clamping polymerizer as a fulcrum. The vertical outer wall reinforcing bar of terminal swing joint of bracing piece waits that the support frame to transfer to after the assigned position struts the reinforcing bar bed frame, and the bracing piece is terminal to support vertical outer wall reinforcing bar near the pore wall, strengthens the stability of support frame.

Furthermore, the movable clamping polymerizer is connected with the central shaft in a sliding mode, and a plurality of salient points are arranged on the central shaft and used for adjusting the opening and closing size of the support frame and improving the clamping stability of the support frame. When the anti-slide piles with different sizes are required to be adopted in different slopes or different sections of the same slope, the opening and closing sizes of the support frame can be adjusted, so that the sizes of the reinforcement cage can be adjusted by pushing the movable clamping polymerizers to different positions, and the anti-slide pile structures with different sizes are met.

The invention also provides an installation method of the expandable slide-resistant pile, which mainly comprises the following steps: s1, calculating the coordinate of each anti-slide pile according to the designed pile position coordinate elements so as to ensure the accuracy of construction control of each pile position; s2, carrying out static pressure treatment on the wellhead surface by adopting a road roller before hole opening, reinforcing the wellhead retaining wall and preventing ground collapse; s3, adjusting the operation position to drill holes and take soil; s4, trimming and napping the hole wall, and removing slag from the hole bottom; s5, opening the steel bar base frame, putting the steel bar base frame into the hole, adjusting the diameter of the steel bar base frame to be proper, and then installing and fixing the steel bar base frame; and S6, pouring concrete.

When concrete is poured, the mixing quality of the concrete or cement is strictly controlled, a conventional pouring method can be adopted, a series of cylinders are adopted for flow guiding, the phenomenon of concrete or cement segregation caused by direct falling from high altitude is avoided, and the slump of the concrete or cement is preferably controlled to be about 4-7 cm. The concrete or cement soil with certain flow state property before solidification can seamlessly fill any irregular gap between the reinforcement cage and the construction hole, and the solidified self-compacting concrete or cement soil can generate good interface fitting contact with the reinforcement cage and the side slope soil and generate ideal shear strength matching with the reinforcement cage. Meanwhile, the actual installation process is not limited to the above steps, for example, in the step S5, in order to enhance the implementability, for a bore diameter larger than 800mm, it is preferable that the reinforcing steel bar base frame is firstly dropped into the bore by using a crane, then the reinforcing steel bar base frame is opened, and then the installation and the fixation are performed.

Furthermore, in the step S6, self-compacting cement soil is preferably used for casting, wherein the ratio of cement to soil is 1-10: 10. The soil in the cemented soil preferably comes from soil extracted from the drilled hole at or near the pile location. Especially under the condition that the pile position is deep and the pile diameter is small, the concrete is not favorable for matching with the expandable reinforcement cage and influencing the stability of the reinforcement cage during pouring because part of broken stone aggregate is difficult to vibrate and stir uniformly. The self-compacting cement soil has better flow state characteristic before solidification, can well fill construction reserved holes and construction gaps with more complex shapes, and has good interface contact characteristic with a reinforcement cage and a side slope soil body. Meanwhile, the in-situ soil generated by punching operation is fully and reasonably utilized, the resource waste is reduced, and the cost is reduced by making the best use of the resources. The pumped in-situ soil is directly poured into a mixing pumping station to prepare self-compaction cement soil, and pumping is carried out to pour the anti-slide pile body, the cement soil prepared from the in-situ soil is close to the inner surface of the pile hole due to soil quality, the cement soil and the pile hole have stronger bonding performance, the construction gap is better filled, and the stability is better after the cement soil is dried.

Compared with the prior art, the invention has the beneficial effects that:

1. the reinforcing steel bar base frame provided by the invention can be prefabricated in advance by a factory and then transported to a site for installation, so that the manufacturing and installation of a large-diameter reinforcing steel bar cage in a hole in the prior art are replaced, the conventional reinforcing steel bar cage is long in manufacturing time in the hole, and the landslide phenomenon is easily caused under the condition that a side slope section is unstable.

2. The support frame supports the vertical outer wall steel bars to form the steel bar cage, namely on the basis of the steel bar cage in the prior art, the support frame has the supporting and fixing functions of the central shaft and the support frame, and the stability and the bending resistance of the slide-resistant pile structure are ensured.

3. In the prior art, rectangular anti-slide piles are mostly adopted, because the anti-bending effect is good, the construction speed of excavating pile holes is slow, and the safety of constructors is difficult to guarantee; the anti-slide pile provided by the invention is a round pile, and can be formed by high-efficiency machinery on the premise of ensuring the anti-bending effect, so that the construction efficiency is further improved, and the safety of constructors is ensured.

4. Different slopes or different sections of the same slope need to adopt anti-slide piles with different sizes, the support frame can adjust the opening and closing size, the size of the reinforcement cage is adjusted by pushing the movable clamping polymerizer to different positions, and the anti-slide pile structures with different sizes are met.

Drawings

Fig. 1 is a schematic structural view of a closed state of the reinforcing steel bar base frame of the present invention;

fig. 2 is a structural view illustrating an opened state of the reinforcing cage of the present invention.

The labels in the figure are:

1. the steel wire rope comprises a central shaft, 2 support frames, 21 movable clamping polymerizers, 22 support rods and 3 vertical outer wall steel bars.

Detailed Description

1. For a better understanding of the present invention, reference is made to the following examples which illustrate the invention. The invention is mainly suitable for the construction of the anti-slide pile with smaller volume, and the pile diameter of the anti-slide pile is preferably 70-500 mm.

Example 1

The slide-resistant pile is formed by pouring concrete through a steel bar base frame, the steel bar base frame comprises a center shaft 1, a support frame 3 and vertical outer wall steel bars 3, the center shaft is a steel pipe, the support frame comprises a movable clamping polymerizer 21 and a plurality of support rods 22, the movable clamping polymerizer 21 is connected with the center shaft 1, and the support rods 22 are dispersedly installed around by taking the movable clamping polymerizer 21 as a fulcrum. The support rod 22 can be opened or closed around the movable clamping polymerizer 22, and the support frame 2 is in an umbrella shape after being opened; the quantity of bracing piece 22 equals with 3 quantity of vertical outer wall reinforcing bars, and a vertical outer wall reinforcing bar 3 of end-to-end connection of every bracing piece 22, bracing piece 22 rotate with vertical outer wall reinforcing bar 3 to be connected, and all vertical outer wall reinforcing bars 3 form the steel reinforcement cage after support frame 2 struts, and the steel reinforcement cage is coaxial with center pin 1. The central shaft is similar to an umbrella handle, the supporting frame is similar to an umbrella shape after being unfolded, and the reinforcing steel bars on the vertical outer wall are wound for one circle around the umbrella. The reinforcing bar bed frame can be prefabricated by the mill, and the shrink is got up and is conveniently transported, and its support frame is like the structure that the umbrella can strut and contract, and the reinforcing bar bed frame is opened earlier tentatively before transferring to reserving friction pile construction hole, transfers again to suitable opening degree with reinforcing bar bed frame adjustment after the assigned position to with the pore wall chucking, after the hole bottom is fixed, form stable steel reinforcement cage structure.

Example 2

The slide-resistant pile is formed by pouring concrete through a steel bar base frame, the steel bar base frame comprises a central shaft 1, a support frame 2 and vertical outer wall steel bars 3, the central shaft 1 is a steel pipe, the support frame 2 comprises a movable clamping polymerizer 21 and a support rod 22, the movable clamping polymerizer 21 is connected with the central shaft 1, and the support rod 22 is dispersedly installed around by taking the movable clamping polymerizer 21 as a fulcrum. The support frame 2 has two sets ofly, parallel arrangement about every group support frame 2, and the bracing piece 2 of the support frame of last group is parallel rather than the bracing piece 22 one-to-one of a set of support frame down, and same root vertical outer wall reinforcing bar 3 is all connected to the end that corresponds bracing piece 22 from top to bottom in each vertical direction. The two groups of support frames 2 are reversely connected with the central shaft 1, namely, are in a transverse axisymmetric structure, and are in two opposite umbrella-shaped structures after being opened, so that the stability of the vertical outer wall reinforcing steel bar 3 is further improved. Furthermore, the movable clamping polymerizer is connected with the central shaft in a sliding manner, and a plurality of salient points are arranged on the central shaft and used for adjusting the opening and closing size of the support frame 2 and improving the clamping stability of the support frame 2.

The installation method of the expandable slide-resistant pile mainly comprises the following steps: s1, calculating the coordinate of each anti-slide pile according to the designed pile position coordinate elements so as to ensure the accuracy of construction control of each pile position; s2, carrying out static pressure treatment on the wellhead surface by adopting a road roller before hole opening, reinforcing the wellhead retaining wall and preventing ground collapse; s3, adjusting the operation position to drill holes and take soil; s4, trimming and napping the hole wall, and removing slag from the hole bottom; s5, opening the steel bar base frame, putting the steel bar base frame into the hole, adjusting the steel bar base frame to a proper diameter, positioning the central shaft at the center of the pile hole, and then installing and fixing; and S6, pouring concrete. When concrete is poured, the mixing quality of the concrete is strictly controlled, when the concrete is dry and has no water or a small amount of water seepage, a conventional pouring method can be adopted, the flow guide of the tandem cylinder is adopted, the concrete segregation phenomenon caused by direct falling at high altitude is avoided, and the slump of the concrete is preferably controlled to be about 4 cm. Specifically, during construction, the preferred 110mm ~ 350mm of stake hole diameter, and the length more than or equal to stake hole radius of bracing piece, but be less than stake hole diameter, the preferred 90 degrees of angle of bracing piece and center pin is the optimum when the length of bracing piece is stake hole radius promptly.

The foregoing is merely a preferred embodiment and is not intended to limit the scope of the invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. All equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present patent.

Claims

1. A kind of extendible antiskid pile, pour and form through concrete or cement by the steel bar bed frame, characterized by that, the said steel bar bed frame includes central axis, support frame and vertical outer wall steel bar, the support frame is fitted on central axis, the said support frame includes several brace rods, the support frame is umbelliform after spreading; the end of each supporting rod is connected with a vertical outer wall steel bar, and after the supporting frame is unfolded, all the vertical outer wall steel bars form a steel bar cage which is coaxially arranged with the central shaft.

2. A collapsible slide resistant pile according to claim 1, characterised in that the diameter of the reinforcement cage is preferably 70-500 mm.

3. The expansible slide-resistant pile according to claim 1, wherein each slide-resistant pile has a plurality of sets of supporting frames, and each set of supporting frames is arranged in parallel up and down, the supporting rods of the upper set of supporting frames are parallel to the supporting rods of the lower set of supporting frames in a one-to-one correspondence, and the end of each vertically corresponding supporting rod is connected with the same vertical outer wall steel bar.

4. A collapsible slide resistant pile as claimed in claim 3, characterised in that: the support frame has two sets, and is reverse connection center pin.

5. The expansible anti-slide pile of claim 1, wherein the support frame further comprises a movable snap-in aggregator connected to the central shaft, the support rods being dispersedly mounted around the movable snap-in aggregator as a fulcrum.

6. A collapsible anti-slide pile according to claim 5, characterised in that the movable snap-in aggregator is slidably connected to a central shaft, said central shaft being provided with a number of protrusions.

7. A method of installing a collapsible slide resistant pile according to claim 1, characterised by the main steps of: s1, calculating the coordinate of each anti-slide pile according to the designed pile position coordinate elements so as to ensure the accuracy of construction control of each pile position; s2, carrying out static pressure treatment on the wellhead surface before drilling, reinforcing the wellhead retaining wall and preventing ground collapse; s3, adjusting the operation position to drill holes and take soil; s4, trimming and napping the hole wall, and removing slag from the hole bottom; s5, opening the steel bar base frame, putting the steel bar base frame into the hole, adjusting the diameter of the steel bar base frame to be proper, and then installing and fixing the steel bar base frame; and S6, pouring concrete or cement soil.

8. The method of installing a collapsible slide pile according to claim 7, wherein in step S6, soil cement is preferable for casting.

9. The method for installing a collapsible slide-resistant pile according to claim 8, wherein the cement soil is self-compacting cement soil, and the ratio of cement to soil is 1-10: 10.

10. A method of installing a collapsible slide resistant pile according to claims 7-9, characterised in that the soil in the cemented soil is soil extracted by drilling at or near the pile location.