CN207878200U - Face bank subgrade support retainer structure - Google Patents

Description

Coastal subgrade support structure

technical field

The utility model relates to the technical field of road construction engineering, in particular to a supporting and retaining structure of a roadbed near the shore.

Background technique

With the development of tourism and the increase of traffic volume, the planning and road conditions of the original roads cannot meet the demand; in order to improve the carrying capacity, there are more and more upgrading and reconstruction projects of roads around the river, around the river and around the lake. Widen the road on the water side. However, due to river scouring and deposition on the waterside, the stratum is mostly muddy soil, loose plain fill or fine sand with pebbles, and the bearing capacity of the foundation is relatively weak; in addition, the terrain on the waterside is relatively complex and the site is relatively narrow , the construction space is limited, and it is difficult to build an embankment on the water side.

When widening the subgrade in areas with weak foundations such as waterfronts, in order to minimize the occupation of the river width, retaining walls are often used to protect embankment works; retaining walls in the prior art include gravity type, buttress type and cantilever type. The retaining wall mainly relies on the self-weight of the wall or the filling of the bottom plate to maintain the stability of the retaining wall structure. However, the building retaining wall has high requirements on the bearing capacity of the foundation; for areas with weak foundation bearing capacity such as the water side, pile foundations need to be set under the retaining wall. On the one hand, the pile foundation can enhance the bearing capacity of the foundation and improve the stability of the retaining wall; on the other hand, it can also play a role in strengthening the side slope facing the water.

Pile foundations commonly used in the prior art include bored cast-in-situ piles, powder-sprayed piles and pine piles. However, due to the need for large-scale equipment in the construction process of pile foundation hole formation and steel cage hoisting, bored piles are difficult to construct in areas such as waterfront roads; in addition, the construction process of bored piles is likely to cause disturbance to the ground , leading to additional deformation and even instability and failure of the subgrade near the water. Powder-sprayed piles and pine piles are less stable in areas such as waterfronts, and are easily affected by factors such as river erosion and water level fluctuations, resulting in damage to pile foundations and loss of bearing capacity.

To sum up, in the prior art, there are technical problems of weak foundation bearing capacity and high construction difficulty in the waterside road widening project.

Utility model content

The purpose of the utility model is to provide a shore-side subgrade support structure to alleviate the technical problems of weak foundation bearing capacity and difficult construction existing in the water-side road widening project in the prior art.

The supporting and retaining structure of the subgrade near the shore provided by the utility model includes: vertical micro-pile, inclined micro-pile and retaining wall; The straight micropile is arranged on the side of the inclined micropile away from the shore, and extends downward from the ground along the vertical direction; the retaining wall is fixedly connected to the top of the vertical micropile and the inclined micropile.

Further, the angle between the axis of the inclined micro pile and the plumb line ranges from 15° to 20°.

Further, a first steel pipe is arranged in the vertical micro-pile, and the first steel pipe extends along the length direction of the vertical micro-pile, and a first grout hole is provided on the pipe wall of the first steel pipe; a second grout hole is arranged in the inclined micro-pile. A steel pipe, the second steel pipe extends along the length direction of the inclined micro-pile, and a second grout hole is arranged on the pipe wall of the second steel pipe.

Further, the retaining structure of the subgrade on the shore includes a plurality of inclined micro piles, which are arranged at intervals along the length direction of the bank; the retaining structure of the subgrade on the shore includes multiple rows of vertical micro pile groups, and each row of vertical The group includes a plurality of vertical micro-piles arranged at intervals along the length direction of the bank, and the multi-row vertical micro-pile groups are arranged at intervals along the direction from the near-shore side to the far-shore side.

Further, the distance between adjacent vertical micro piles is 0.8m-1m.

Further, a balance weight platform is provided on the side of the retaining wall away from the bank, and the balance weight platform is used for carrying backfill roadbed materials.

Further, the side of the retaining wall above the balance platform is inclined from bottom to top towards the shore, and the side of the retaining wall below the balance platform is inclined from top to bottom towards the shore.

Further, the retaining structure of the shore subgrade further includes a cap, the cap is fixedly connected to the tops of the vertical micro-pile and the inclined micro-piles, and the retaining wall is fixed on the top of the cap.

Further, the first stiffeners are arranged in the vertical micro piles, and the first stiffeners extend from the vertical micro piles to the cap; the second stiffeners are arranged in the inclined micro piles, and the second stiffeners extend from The micro-pile extends into the cap.

Further, each vertical micropile is provided with a plurality of first stiffeners, and the plurality of first stiffeners are distributed along the outer circumference of the vertical micropile at intervals, and the part of each first stiffener located in the cap is outward Bending; multiple second stiffeners are arranged in each inclined micro pile, and the plurality of second stiffeners are distributed along the outer circumference of the inclined micro pile at intervals, and the part of each second stiffener located in the cap is bent outward .

The utility model provides a supporting and retaining structure for a shore roadbed, which relates to the technical field of road construction engineering. The supporting and retaining structure of the subgrade near the shore provided by the utility model includes: vertical micro-pile, inclined micro-pile and retaining wall; The straight micropile is arranged on the side of the inclined micropile away from the shore, and extends downward from the ground along the vertical direction; the retaining wall is fixedly connected to the top of the vertical micropile and the inclined micropile. The retaining wall in the retaining structure of the roadbed near the shore provided by the utility model can move the overall center of gravity of the roadbed structure to the offshore side to resist the lateral pressure of the soil body and improve the stability of the embankment on a steep slope. On the one hand, the vertical micropile and inclined micropile can strengthen the ground and prevent river erosion, and on the other hand, it can increase the vertical bearing capacity of the foundation; Reduce the damage of the subgrade structure caused by the shear force and bending moment caused by the horizontal load. Vertical micropiles and inclined micropiles can be constructed using down-the-hole drilling rigs or bolter rigs, eliminating the need for large mechanical equipment, requiring less work space, less disturbance to the formation, and environmentally friendly.

The supporting structure of the subgrade near the shore provided by the utility model improves the overall stability of the subgrade structure by combining vertical micro-pile and inclined micro-pile, and the construction process does not require large-scale mechanical equipment, thereby alleviating the pressure on the side of the water in the prior art. The road widening project has technical problems such as weak foundation bearing capacity and difficult construction.

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the preferred embodiments of the present utility model are specifically cited below, together with the attached drawings, for a detailed description as follows.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is the structural schematic diagram of the first angle of view of the supporting structure of the shore roadbed provided by the embodiment of the present invention;

Fig. 2 is a partial perspective view of the retaining structure of the shore subgrade provided by the embodiment of the present invention;

Fig. 3 is the top view of vertical miniature piles, inclined miniature piles and caps in the shore retaining structure provided by the embodiment of the utility model;

Fig. 4 is a structural schematic diagram of the first steel pipe in the support structure of the shore subgrade provided by the embodiment of the present invention.

Icon: 01-vertical micropile; 011-first steel pipe; 0111-first grout hole; 012-first stiffener; 02-inclined micro pile; 021-second steel pipe; 022-second stiffener; 03 -retaining wall; 031-balance platform; 04-support platform.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Please refer to Fig. 1, the shore-side subgrade support structure provided by the embodiment of the utility model includes: vertical micropile 01, inclined micropile 02 and retaining wall 03; inclined micropile 02 is arranged on the near shore side of the subgrade, and Extending downwards towards the subgrade near the shore; the vertical micropile 01 is set on the side of the inclined micropile 02 away from the shore, and extends downward from the ground in the vertical direction; the retaining wall 03 is fixedly connected to the vertical micropile 01 And tilt the top of the Micropillar 02.

Specifically, the retaining wall 03 in the shore retaining structure provided by the embodiment of the utility model can move the overall center of gravity of the roadbed structure to the offshore side to resist the lateral pressure of the soil and improve the stability of the steep slope embankment. The vertical micropile 01 and the inclined micropile 02 can strengthen the ground on the one hand, prevent river water from scouring and eroding, and on the other hand, can improve the vertical bearing capacity of the foundation. In addition, the inclined micropile 02 arranged on the shore side of the subgrade can also increase the horizontal bearing capacity and reduce the damage to the subgrade structure caused by the shear force and bending moment caused by the horizontal load. Vertical micropiles 01 and inclined micropiles 02 can be constructed using down-the-hole drilling rigs or bolter rigs, eliminating the need for large machinery and equipment, requiring less work space, less disturbance to the ground, and friendly to the ecological environment.

In some embodiments, for the vertical micropiles 01, a down-the-hole drilling machine is used to drill holes; the hole diameter is 20cm, and the hole depth is 4m-12m. Drill to the design depth, use the air compressor to blow the hole with strong wind, and remove the sediment in the hole.

For inclined micropiles 02, the holes are drilled with a rod bolter. During construction, after positioning the pile position, adjust the position and angle of the bolter, and check the inclination of the pile in time during the drilling process.

In some embodiments, after the holes of the vertical micro-piles 01 and the inclined micro-piles 02 are drilled, pressure grouting is performed by using the grouting method at the bottom of the holes. The grouting material is M30 mortar, which is prepared by P.O42.5 grade cement and machine-made sand. The design mix ratio is water: cement: sand: water glass = 0.42:1:1:0.008. Stir. The mixed concrete mortar is put into the ash tank made by welding the steel plate, and then grouted by the grouting machine, the grouting pressure is 0.5-1MPa; after the grout overflows, the orifice is closed to stabilize the pressure for a few minutes, and then stop after overflowing again. Note.

In some embodiments, the retaining wall 03 is poured with C30 concrete. Erection of retaining wall formwork, using steel formwork support, steel pipes as ribs, matching pull screws, and fixed on double steel pipes through "3" type butterfly clips for reinforcement, locks are fixed with steel pipes to improve the stability of the formwork support system . Retaining wall 03 is provided with a settlement joint every 10m~15m, the width of the seam is 2cm~3cm, and the settlement seam is filled with asphalt hemp along the wall. The retaining wall 03 is located above the ground, and weep holes are arranged staggeredly every 2m to 3m. The diameter of the weep holes is 100mm-110mm; Wrap to prevent weep holes from clogging.

Further, the angle between the axis of the inclined micropile 02 and the plumb line ranges from 15° to 20°.

Specifically, according to the overall structural characteristics of the subgrade and road and the size of the horizontal load required to be carried, the angle between the axis of the inclined micropile 02 and the plumb line can be set to 15°, 18° or 20°; Larger, the larger the included angle. According to engineering construction experience, setting the angle between the axis of the inclined micropile 02 and the plumb line within the range of 15°-20° can make the inclined micropile 02 have a large vertical load-bearing capacity and meet the requirements of the subgrade. Structural requirements for horizontal load carrying capacity.

Further, please refer to Fig. 2 and Fig. 4, the first steel pipe 011 is arranged inside the vertical micro-pile 01, the first steel pipe 011 extends along the length direction of the vertical micro-pile 01, and the pipe wall of the first steel pipe 011 is provided with a second A slurry hole 0111; a second steel pipe 021 is arranged in the inclined micro-pile 02, and the second steel pipe 021 extends along the length direction of the inclined micro-pile 02, and a second slurry hole is arranged on the wall of the second steel pipe 021.

Specifically, during construction, after the holes of the vertical micropile 01 are drilled, the first steel pipe 011 is put into the hole, and then grouting is performed; overall. The first steel pipe 011 can enhance the strength and vertical load bearing capacity of the vertical micro pile 01 .

During construction, after the hole position of the inclined micro pile 02 is drilled, the second steel pipe 021 is put into the hole, and then grouting is performed; the mortar inside and outside the second steel pipe 021 is connected as a whole through the second grout hole. The second steel pipe 021 can enhance the strength, vertical load bearing capacity and horizontal load bearing capacity of the inclined micro pile 02 .

In some embodiments, both the first steel pipe 011 and the second steel pipe 021 are made of hot-dip galvanized seamless steel pipes. The seamless steel pipe has an inner diameter of 146mm and a thickness of 6.5mm. When the length of a single seamless steel pipe is not enough, a sleeve can be used to connect multiple seamless steel pipes according to the designed length. The length of the sleeve is 400mm, and the wall thickness is 6.5mm; the connection between the sleeve and the seamless steel pipe is welded, and the welding should be full.

In some embodiments, the first slurry outlet hole 0111 is set in the interval from the top surface of the first steel pipe 011 to the bottom by 140 cm, and the diameter of the first slurry outlet hole 0111 is 10 mm.

Please refer to FIG. 4 , in some embodiments, a first steel pipe 011 is provided with a plurality of first slurry outlet holes 0111, and the plurality of first slurry outlet holes 0111 are arranged at intervals, and between adjacent first slurry outlet holes 0111 The spacing is 15cm.

In some embodiments, a second steel pipe 021 is provided with a plurality of second slurry outlet holes, and the plurality of second slurry outlet holes are arranged in the interval from the top surface of the second steel pipe 021 to the bottom by 140 cm, and are arranged at intervals, The distance between adjacent second pulp outlet holes is 15cm. The diameter of the second slurry hole is 10mm.

Further, the shore-side roadbed support structure provided by the embodiment of the utility model includes a plurality of inclined micro-pile 02, and the plurality of inclined micro-pile 02 is arranged at intervals along the length direction of the bank; the shore-side roadbed support structure provided by the embodiment of the utility model The structure includes multiple rows of vertical micro-pile groups, each row of vertical micro-pile groups includes a plurality of vertical micro-piles 01 arranged at intervals along the length direction of the shore, and the multiple rows of vertical micro-pile groups are along the direction from the near shore to the far shore. The direction interval setting of .

Specifically, referring to Fig. 1 and Fig. 3, a plurality of inclined micro piles 02 are located on the same straight line, and the distances between adjacent inclined micro piles 02 are equal, so that the load borne by each inclined micro pile 02 is relatively Balanced, conducive to the overall stability of the road structure. The number of vertical micro pile groups is 3 groups, and multiple vertical micro piles 01 in a single row of vertical micro pile groups are located on the same straight line.

In some embodiments, the number and arrangement density of the vertical micropile groups can be adjusted according to the size of the road structure from the shore side to the far shore side, and the requirements for the road bearing capacity.

In some embodiments, according to the extension direction of the bank, the connection line of multiple inclined micropile 02 is a matching curve, and the distance between adjacent inclined micropile 02 is set according to the structure of each section of the road.

In some embodiments, a plurality of inclined micropiles 02 may be arranged in multiple rows arranged at intervals along the direction from the near-shore side to the far-shore side.

Further, the distance between adjacent vertical micro piles 01 is 0.8m-1m.

Specifically, for the convenience of construction and the balance of stress on the overall subgrade structure, the distances between adjacent vertical micropiles 01 are equal, which can be 0.8m, 0.9m, or 1m. According to different requirements on the vertical load-bearing capacity of the road, the arrangement density of the vertical micro-piles 01 is adjusted; the larger the vertical load, the smaller the distance between adjacent vertical micro-piles 01 .

Further, a counterweight platform 031 is provided on the side of the retaining wall 03 away from the shore, and the counterweight platform 031 is used to carry backfill roadbed materials.

Specifically, please refer to FIG. 1 , the lower part of the retaining wall 03 is provided with a protrusion extending to the offshore side, and the upper part of the protrusion forms a counterweight platform 031 . The top surface of the protrusion is flat, and the upper part of the protrusion can be filled with backfill roadbed materials such as soil or gravel, and the pavement structure is also arranged above the protrusion. The downward force of the backfill roadbed material acting on the protrusion can make the resultant force point of the resultant force of the vertical direction force on the shore roadbed supporting structure provided by the embodiment of the present invention move to the offshore side, reducing the The magnitude of the bending moment on the small vertical micropile 01 and the inclined micropile 02.

Further, the side of the retaining wall 03 located above the counterweight platform 031 is inclined from bottom to top towards the shore, and the side below the counterweight platform 031 is inclined from top to bottom towards the shore.

Specifically, please refer to FIG. 1 . The side of the retaining wall 03 is inclined according to the above-mentioned shape, which can increase the area of the top surface of the counterweight platform 031 in a limited space, thereby increasing the carrying capacity of the backfill roadbed material. In addition, the retaining wall 03 of this shape can make the center of gravity close to the offshore side, which is beneficial to improve the stability of the structure.

Further, the bank-side subgrade support structure provided by the embodiment of the present utility model also includes a cap 04, and the cap 04 is fixedly connected to the tops of the vertical micropile 01 and the inclined micropile 02, and the retaining wall 03 is fixed on the top of the cap 04. top.

Specifically, please refer to FIG. 1 , the platform 04 is arranged between the vertical micro-piles 01 and the inclined micro-piles 02 and the retaining wall 03 . The bearing platform 04 can spread the vertical pressure, so that the stress of the vertical micro-piles 01 and the inclined micro-piles 02 is more balanced. The cap 04 connects the bottom foundation of the retaining wall 03 into a whole, which can prevent local settlement from causing cracks.

After the mortar of the vertical micro-piles 01 and the inclined micro-piles 02 is solidified, the bearing platform 04 is cast-in-situ through formwork. During construction, concrete is poured by automobile pump, and C30 commercial concrete is used in the pouring process. The concrete is poured in layers, and an expansion joint is set every 10m.

In some embodiments, structural steel bars are arranged inside the platform 04, and the structural steel bars are formed by lapping multiple horizontally and vertically arranged steel bars, and the joints of the steel bars are connected by lap welding.

Further, the vertical micro-pile 01 is provided with a first stiffener 012, and the first stiffener 012 extends from the vertical micro-pile 01 to the cap 04; the inclined micro-pile 02 is provided with a second stiffener 022 , the second stiffener 022 extends from the inclined micro pile 02 to the cap 04 .

Specifically, the two ends of the first stiffener 012 are respectively embedded in the vertical micro pile 01 and the cap 04, which can enhance the connection firmness between the vertical micro pile 01 and the cap 04. The two ends of the second stiffener 022 are respectively embedded in the inclined micro-pile 02 and the cap 04, which can enhance the firmness of the connection between the inclined micro-pile 02 and the cap 04.

Further, each vertical micropile 01 is provided with a plurality of first stiffeners 012, and the plurality of first stiffeners 012 are distributed along the outer circumference of the vertical micropile 01 at intervals, and each first stiffener 012 is located on the cap The part inside 04 is bent outward; each inclined micro pile 02 is provided with a plurality of second stiffeners 022, and the plurality of second stiffeners 022 are distributed along the outer circumference of the inclined micro pile 02 at intervals, and each second stiffener The part 022 located in the platform 04 is bent outwards.

Specifically, multiple first stiffeners 012 further enhance the connection strength between the vertical micropile 01 and the cap 04, and the first stiffeners 012 are bent outward, which can improve the connection between the vertical micropile 01 and the cap 04. The bearing capacity of the horizontal load, thereby improving the horizontal load bearing capacity of the supporting structure of the shore subgrade provided by the embodiment of the utility model. A plurality of second stiffeners 022 further enhance the connection strength between the inclined micro-pile 02 and the cap 04, and the second stiffeners 022 are bent outwards, which can increase the bearing capacity of the horizontal load at the connection between the inclined micro-pile 02 and the cap 04 capacity, thereby improving the horizontal load-carrying capacity of the bank-side subgrade retaining structure provided by the embodiment of the present invention.

Finally, it should be noted that each embodiment in this specification is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of each embodiment refer to each other That is to say; the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it still The technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. one kind facing bank subgrade support retainer structure, which is characterized in that including：Vertical mini pile tilts mini pile and barricade；It is described to incline Oblique mini pile is set to the offshore side of roadbed, and tilts and extend to roadbed offshore edge down from ground；The vertical mini pile It is set to the inclination side of the mini pile far from bank, and is vertically extended downwardly from ground；

The barricade is fixedly connected at the top of the vertical mini pile and the inclination mini pile.

2. according to claim 1 face bank subgrade support retainer structure, which is characterized in that the axis and lead for tilting mini pile Ranging from 15 ° -20 ° of angle between vertical line.

3. according to claim 1 face bank subgrade support retainer structure, which is characterized in that be provided in the vertical mini pile One steel pipe, first steel pipe extend along the length direction of the vertical mini pile, and the tube wall of first steel pipe is equipped with the One slurry outlet；

The second steel pipe is provided in the inclination mini pile, second steel pipe prolongs along the length direction for tilting mini pile It stretches, the tube wall of second steel pipe is equipped with the second slurry outlet.

4. according to claim 3 face bank subgrade support retainer structure, which is characterized in that the bank subgrade support retainer structure of facing includes The more inclination mini piles, the more mini piles that tilt are arranged along the length direction interval on bank；

The bank subgrade support retainer structure of facing includes multiple rows of vertical mini pile group, and it includes more banks often to arrange the vertical mini pile group The spaced vertical mini pile of length direction on side, multiple rows of vertical mini pile group is along from facing direction of the bank side to remote bank side Interval setting.

5. according to claim 4 face bank subgrade support retainer structure, which is characterized in that between the adjacent vertical mini pile Distance is 0.8m-1m.

6. facing bank subgrade support retainer structure according to claim 1-5 any one of them, which is characterized in that the separate bank of the barricade The side on side is provided with weight platform, and the weight platform is for carrying backfilled roadbed supported material.

7. according to claim 6 face bank subgrade support retainer structure, which is characterized in that the barricade is located on the weight platform Bank inclination is directed toward in the side of side from bottom to top, and bank inclination is directed toward in the side below weight platform from top to down.

8. facing bank subgrade support retainer structure according to claim 1-5 any one, which is characterized in that described to face bank subgrade support It further includes cushion cap to keep off structure, and the cushion cap is fixedly connected on the vertical mini pile and tilts the top of mini pile, the barricade It is fixed on the top of the cushion cap.

9. according to claim 8 face bank subgrade support retainer structure, which is characterized in that be both provided in the vertical mini pile First puts more energy into muscle, and the described first muscle of putting more energy into is extended to from the vertical mini pile in the cushion cap；

It is both provided with second in the inclination mini pile to put more energy into muscle, the described second muscle of putting more energy into is extended to from the inclination mini pile In the cushion cap.

10. according to claim 9 face bank subgrade support retainer structure, which is characterized in that in the every vertical mini pile Equipped with more described first muscle of putting more energy into, more described first muscle of putting more energy into are spaced apart along the periphery of the vertical mini pile, and The part bending outward that every described first muscle of putting more energy into is located in the cushion cap；

More described second muscle of putting more energy into are provided in the every inclination mini pile, more described second are put more energy into muscle along the inclination The periphery of mini pile is spaced apart, and the part bending outward that every described second muscle of putting more energy into is located in the cushion cap.