CN216839414U - Reinforcing apparatus of siltstone layer bored pile - Google Patents
Reinforcing apparatus of siltstone layer bored pile Download PDFInfo
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- CN216839414U CN216839414U CN202220552410.7U CN202220552410U CN216839414U CN 216839414 U CN216839414 U CN 216839414U CN 202220552410 U CN202220552410 U CN 202220552410U CN 216839414 U CN216839414 U CN 216839414U
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Abstract
The utility model belongs to the technical field of the bridge construction, specifically a reinforcing apparatus of siltstone layer bored concrete pile. The orifice reinforcing structure comprises a plurality of groups of small orifice grouting pipes arranged along the annular direction of an orifice, the small grouting pipes are vertically inserted into a silty rock body, and an annular concrete retaining wall is arranged on the inner side of the orifice; the reinforced structure of the part below the orifice comprises a plurality of groups of small inclined grouting guide pipes arranged on the inner side of the lower part of the concrete retaining wall, the small inclined grouting guide pipes are arranged along the inner side of the concrete retaining wall in the annular direction, and the small inclined grouting guide pipes are obliquely inserted into the concrete retaining wall and the silty rock. The utility model discloses avoid adopting large-scale mechanical equipment under limited operation space and operating condition, it is more convenient than traditional hole stake periphery to carry out high pressure jet grouting water-stop curtain reinforcement, avoids large-scale mechanical equipment taking place the risk of side shifting, toppling near existing line scope.
Description
Technical Field
The utility model belongs to the technical field of the bridge construction, specifically a reinforcing apparatus of siltstone layer bored concrete pile.
Background
The development of infrastructure is continuously promoted by the urbanization process, with the change of urban construction day by day, more and more interchange projects are provided, and the stereo intersection construction situation often appears in the highway, railway and municipal traffic engineering. The basic structure of the overhead structure is easy to disturb and influence the existing engineering structure, and particularly the line settlement control is particularly important for the existing railway line with strict requirements on the foundation settlement control. The construction method is influenced by the requirement of safety protection close to the existing line, the space of large mechanical construction such as a percussion drill and a rotary excavating pile is limited, manual hole digging piles are selected for construction under most conditions, and if water-rich silty sands are encountered, unfavorable geological phenomena such as water gushing and hole collapse are easily generated in the excavation process, so that the safety of constructors and lines is endangered. The traditional method is that a plurality of high-pressure jet grouting piles are driven into the periphery of a pile foundation to form a water-stop curtain wall for pre-reinforcement, the curtain wall can control settlement and prevent water burst and hole collapse, but a high-pressure jet grouting drilling machine is required, the operation space is limited, the scheme examination and approval are difficult, the construction period is long, and the construction project with short construction period is not easy to realize. Therefore, it is necessary to develop a reinforcing apparatus suitable for a hole digging pile of a siltstone layer.
Disclosure of Invention
The utility model discloses a being close on existing line scope by the restriction of operation space condition, can simply be suitable for and the convenient hole digging pile reinforcing apparatus who operates, can the effective control circuit subside, prevent to gush water, the emergence of hole collapse phenomenon, guarantee constructor and property safety, provide a reinforcing apparatus of siltstone layer hole digging pile.
The utility model adopts the following technical proposal: a reinforcing device for a hole digging pile of a siltstone layer comprises an orifice reinforcing structure and a reinforcing structure at the part below an orifice, wherein the orifice reinforcing structure comprises a plurality of groups of small orifice grouting guide pipes which are arranged along the annular direction of the orifice, the small grouting guide pipes are vertically inserted into a siltstone body, and the inner side of the orifice is provided with an annular concrete retaining wall; the reinforced structure of the part below the orifice comprises a plurality of groups of small inclined grouting guide pipes arranged on the inner side of the lower part of the concrete retaining wall, the small inclined grouting guide pipes are arranged along the inner side of the concrete retaining wall in the annular direction, and the small inclined grouting guide pipes are obliquely inserted into the concrete retaining wall and the silty rock.
Furthermore, 6-8 small grouting guide pipes are arranged and vertically driven into the space of 1.5-2 m.
Furthermore, the oblique grouting small guide pipes are provided with a plurality of layers according to the cross section of the pile foundation, and 6 or more oblique grouting small guide pipes are annularly arranged on the cross section of each layer of the pile foundation.
Furthermore, a stiffening hoop is arranged at the cross section of the pile foundation, a positioning ring is arranged on the stiffening hoop, the inclined grouting small guide pipe penetrates into the positioning ring, the front part of the small guide pipe inclines towards the outer side of the pile hole, and the included angle between the axis and the horizontal direction is 110-120 degrees.
Furthermore, the upper part of the small grouting guide pipe is a grout stopping section without a grouting hole, the diameter of the grouting hole at the lower part of the small grouting guide pipe is 8mm, the grouting hole is arranged in a quincunx shape, the distance between the grouting holes is 10cm, and the lower end part of the small grouting guide pipe is provided with a sealing plate.
Furthermore, the lower end part of the small oblique grouting guide pipe is provided with a conical head, the lower part of the small oblique grouting guide pipe is provided with a plurality of grouting holes, the upper part of the small oblique grouting guide pipe is a grouting stopping section without the grouting holes, a clamping ring used for being connected with a positioning ring is arranged on the outer side of the grouting stopping section, and the upper end part of the small oblique grouting guide pipe is provided with a sealing plate.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) simple process and convenient operation. The combined structure of the small grouting guide pipe, the concrete retaining wall and the stiffening hoops is adopted to form a stable pre-reinforcing technology, and the pre-reinforcing structure is particularly suitable for special working conditions that the settlement of the periphery of an orifice is strictly controlled, and water gushing, hole collapse and the like easily occur in a water-rich siltstone layer.
(2) Centralized processing and low cost. The grouting small pipe and the stiffening hoops are suitable for centralized manufacturing and processing and field assembly, the quality and the working efficiency are improved, the construction period is shortened, and the cost is saved.
(3) The number of the small conduits of the grouting holes and the positions of the stiffening hoop positioning rings can be dynamically adjusted according to the actual geological rock stratum condition and the revelation grouting effect, and the hole pile excavation process is safer and more reliable.
(4) The practicability is strong. Avoid adopting large-scale mechanical equipment under limited operation space and operation condition, it is more convenient than traditional hole stake periphery to carry out high pressure jet grouting water-stop curtain reinforcement, avoids large-scale mechanical equipment to take place the risk of sidesway, toppling near existing line scope.
Drawings
FIG. 1 is a cross-sectional view of a hole pile reinforcing opening of the present invention;
fig. 2 is a top view of the hole pile reinforcing hole of the present invention;
FIG. 3 is a schematic sectional view of a hole pile structure according to the present invention;
fig. 4 is a top view of the hole pile structure of the present invention;
FIG. 5 is a schematic view of the oblique grouting small conduit of the present invention;
FIG. 6 is a schematic view of a stiffening hoop and a positioning ring according to the present invention;
description of reference numerals: 1. the grouting device comprises an orifice, 2 parts of a protective wall, 3 parts of a small conduit, 3-1 parts of an orifice grouting small conduit, 3-2 parts of a slant grouting small conduit, 301 parts of a conical head, 302 parts of a grouting hole, 303 parts of a grout stopping section, 305 parts of a sealing plate, 4 parts of a siltstone body, 5 parts of a stiffening hoop, 501 parts of a positioning ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the reinforcing device for the hole digging pile of the siltstone layer comprises an orifice reinforcing structure and a reinforcing structure at the part below the orifice, wherein the orifice reinforcing structure comprises a plurality of groups of small orifice grouting guide pipes 3-1 which are arranged along the annular direction of the orifice, the small grouting guide pipes 3-1 are vertically inserted into a siltstone body 4, and the inner side of the orifice is provided with an annular concrete retaining wall 2; the reinforcing structure for the part below the orifice comprises a plurality of groups of small inclined grouting guide pipes 3-2 arranged on the inner side of the lower part of the concrete retaining wall 2, the small inclined grouting guide pipes 3-2 are annularly arranged along the inner side of the concrete retaining wall 2, and the small inclined grouting guide pipes 3-2 are obliquely inserted into the concrete retaining wall 2 and the siltstone body 4.
The orifice position is a reinforcement measure for 2m range of the surface shallow layer after each hole pile is drilled, 6-8 small grouting guide pipes 3 are arranged on the periphery of the surface orifice, 1.5-2 m long small grouting guide pipes are vertically driven in for shallow grouting, the grouting pressure is 0.5-1 MPa, the slurry ratio is determined through tests according to the slurry diffusion and permeation effect, and the grouting pressure and time are dynamically adjusted according to the implementation effect.
As shown in fig. 3, the small oblique grouting pipes 3-2 are arranged in multiple layers according to the cross section of the pile foundation, and 6 or more small oblique grouting pipes 3-2 are annularly arranged on the cross section of each layer of the pile foundation. As shown in fig. 4 and 6, a stiffening hoop 5 is arranged at the cross section of the foundation, a positioning ring 501 is arranged on the stiffening hoop 5, the inclined grouting small conduit 3-2 penetrates into the positioning ring 501, the front part of the small conduit inclines towards the outer side of the pile hole, and the included angle between the axis and the horizontal direction is 110-120 degrees.
As shown in figure 5, the upper part of the small grouting guide pipe 3-1 is a grout stopping section without a grouting hole, the diameter of the grouting hole at the lower part of the small grouting guide pipe 3-1 is 8mm, the grouting holes are arranged in a quincunx shape, the distance is 10cm, and the lower end part of the small grouting guide pipe 3-1 is provided with a sealing plate.
The lower end part of the small inclined grouting conduit 3-2 is provided with a conical head 301, the lower part of the small inclined grouting conduit 3-2 is provided with a plurality of grouting holes 302, the upper part of the small inclined grouting conduit 3-2 is a grouting stopping section 303 without grouting holes, the outer side of the grouting stopping section 303 is provided with a snap ring 304 used for being connected with a positioning ring 501, and the upper end part of the small inclined grouting conduit 3-2 is provided with a sealing plate 305.
The concrete construction steps are as follows:
(1) leveling a pile position field, paying off to determine a pile position center, opening a hole to pour a first section of locking protection wall, wherein the opening depth is 0.7m, pouring a concrete protection wall 2 by adopting a shaped steel template, driving 6-8 vertical grouting small guide pipes 3-1 at the periphery of an orifice 1 of a bored pile, performing shallow grouting reinforcement on a silt rock stratum soil body at the periphery of the hole pile, supporting along with excavation, ensuring construction safety and avoiding hole collapse.
(2) The small grouting guide pipe 3 is made of a seamless hot-rolled steel pipe with the diameter of 50mm, the wall thickness is 3.5mm, the length of the small vertical grouting guide pipe is 3-1 m to 1.5-2 m, and the length of the small inclined grouting guide pipe is 3-2 m to 1.0 m. During small guide pipe processing, a 35cm grout stop section 302 is reserved at the tail part, no hole is drilled, the length of a conical head 301 is 10cm, the diameter of each grouting hole 302 is 8mm, the grouting holes are arranged in a quincunx mode, the distance is about 10cm, a sealing plate 305 is arranged at the end part, and two-way grouting pipes 304 which are 25mm in diameter and 15cm in length are welded at the two sides of each steel pipe.
(3) The oblique grouting small pipes 3-2 are arranged 6 in the circumferential direction of each layer of the protecting wall of the cross section of the pile foundation, and can also be arranged in an encrypted manner according to the pile diameter and the revealed geological condition. And (2) embedding a stiffening hoop 5 at the position of the wall protection with the hole bottom of 30cm, drilling a hole at the position of the positioning ring 501 or directly driving the oblique grouting small guide pipe 3-2, wherein the front part of the oblique grouting small guide pipe 3-2 inclines towards the outer side of the pile hole, the included angle between the axis and the horizontal direction is 110-120 degrees, and the lap joint length of each ring is not less than 30cm until a pile is formed.
(4) The inclined grouting small guide pipe 3-2 adopts a drilling or direct impact driving method, and the diameter of a drilled hole is 3-5 mm larger than that of the steel pipe. Then the small oblique grouting guide pipe 3-2 penetrates through the positioning ring 502 to be driven into the pile soil body, and the hammering or jacking length is 0.7m, namely the length is overlapped with the last circulation by about 30 cm. After the small guide pipe is installed, the periphery of the orifice is plugged by mortar or a cement mortar material, and cement paste is sprayed to the periphery of the oblique grouting small guide pipe 3-2 for consolidation if necessary, so that hole collapse or grout spraying during grouting is prevented.
(5) The slurry mixing ratio, the grouting pressure and the grouting time need to be determined by combining the properties of the water-rich silty rock stratum and the grouting of the field excavation inspection effect, a water pressing test is carried out before grouting, whether mechanical equipment is normal or not and whether pipeline connection is correct or not are checked, and in order to accelerate the grouting speed and exert the grouting efficiency of the equipment, a plurality of grouting pipes 304 are adopted for grouting in series.
(6) The grouting reference values are as follows: slurry water-cement ratio (weight ratio) =0.8: 1; and grouting pressure is 0.5MPa, grouting time is 8min, and next circular excavation of the hole digging pile can be carried out 12h after grouting is completed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a reinforcing apparatus of siltstone layer bored pile which characterized in that: the orifice reinforcing structure comprises a plurality of groups of orifice grouting small guide pipes (3-1) which are annularly arranged along an orifice (1), the grouting small guide pipes (3-1) are vertically inserted in a powder sand rock body (4), and an annular concrete retaining wall (2) is arranged on the inner side of the orifice; the reinforcing structure for the part below the orifice comprises a plurality of groups of small inclined grouting guide pipes (3-2) arranged on the inner side of the lower part of the concrete retaining wall (2), the small inclined grouting guide pipes (3-2) are annularly arranged along the inner side of the concrete retaining wall (2), and the small inclined grouting guide pipes (3-2) are obliquely inserted into the concrete retaining wall (2) and the silty rock body (4).
2. The device for reinforcing a siltstone layer bored pile according to claim 1, wherein: the small grouting guide pipes (3-1) are provided with 6-8 guide pipes which are vertically driven into the space of 1.5-2 m.
3. The device for reinforcing a siltstone layer bored pile according to claim 1, wherein: the small inclined grouting pipes (3-2) are provided with a plurality of layers according to the cross section of the pile foundation, and 6 or more small inclined grouting pipes (3-2) are annularly arranged on the cross section of each layer of the pile foundation.
4. The device for reinforcing a siltstone layer bored pile according to claim 3, wherein: the cross section of the pile foundation is provided with a stiffening hoop (5), the stiffening hoop (5) is provided with a positioning ring (501), the inclined grouting small conduit (3-2) penetrates into the positioning ring (501), the front part of the small conduit inclines towards the outer side of the pile hole, and the included angle between the axis and the horizontal direction is 110-120 degrees.
5. The device for reinforcing a siltstone layer bored pile according to claim 1, wherein: the upper part of the small grouting guide pipe (3-1) is a grout stopping section without a grouting hole, the diameter of the grouting hole at the lower part of the small grouting guide pipe (3-1) is 8mm, the grouting hole is arranged in a quincunx shape, the distance is 10cm, and a sealing plate is arranged at the lower end part of the small grouting guide pipe (3-1).
6. The device for reinforcing a siltstone layer bored pile according to claim 1, wherein: the lower end of the small inclined grouting guide pipe (3-2) is provided with a conical head (301), the lower part of the small inclined grouting guide pipe (3-2) is provided with a plurality of grouting holes (302), the upper part of the small inclined grouting guide pipe (3-2) is provided with a grouting stopping section (303) without the grouting holes, two sides of the grouting stopping section (303) are provided with two-way grouting pipes (304), and the upper end part of the small inclined grouting guide pipe (3-2) is provided with a sealing plate (305).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220552410.7U CN216839414U (en) | 2022-03-15 | 2022-03-15 | Reinforcing apparatus of siltstone layer bored pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220552410.7U CN216839414U (en) | 2022-03-15 | 2022-03-15 | Reinforcing apparatus of siltstone layer bored pile |
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| Publication Number | Publication Date |
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| CN216839414U true CN216839414U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220552410.7U Active CN216839414U (en) | 2022-03-15 | 2022-03-15 | Reinforcing apparatus of siltstone layer bored pile |
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| CN (1) | CN216839414U (en) |
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- 2022-03-15 CN CN202220552410.7U patent/CN216839414U/en active Active
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