CN215857832U

CN215857832U - Super high type buttress formula retaining wall supporting construction

Info

Publication number: CN215857832U
Application number: CN202121347662.8U
Authority: CN
Inventors: 王瑞
Original assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Current assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-02-18
Anticipated expiration: 2031-06-15

Abstract

The utility model discloses an ultrahigh buttress retaining wall supporting structure, which comprises a panel, toe boards, heel boards and buttress boards which are all of reinforced concrete structures, wherein backfill materials are filled behind the retaining wall structure; the back of the panel is vertically provided with unloading plates in a grading way, and each unloading plate forms an unloading pressure reducing platform; the unloading plate is lapped with the adjacent buttress plate; a plurality of PVC drain pipes are arranged on the panel from bottom to top, and a drain layer and a back filtering gravel layer which are formed by geotechnical mats are arranged next to the back of the panel to form a whole surface layer back filtering drain passage which can quickly drain accumulated water behind the wall; set up the bed course bottom retaining wall structure, the retaining wall top sets up the escape canal next to the panel. According to the scheme, the unloading plates are vertically arranged on the back of the panel of the conventional counterfort retaining wall in a grading manner according to a certain height, the unloading plates are in lap joint with the adjacent counterfort plates, graded unloading and pressure reduction are carried out on backfill on the back of the wall, and the backfill on the unloading plates increases the dead weight of the counterfort retaining wall and improves the soil pressure bearing capacity of the counterfort retaining wall.

Description

Super high type buttress formula retaining wall supporting construction

Technical Field

The utility model relates to an ultrahigh buttress retaining wall supporting structure, and belongs to the technical field of slope protection engineering.

Background

Retaining wall types commonly applied to geotechnical engineering are mainly divided into rigid retaining walls and flexible retaining walls, wherein the rigid retaining walls mainly refer to gravity type, semi-gravity type and balance weight type retaining walls, and the flexible retaining walls refer to sheet pile type, cantilever type, buttress type and reinforced earth type retaining walls. In general retaining wall design, what the wall height is less than or equal to 5m belongs to ordinary retaining wall, what the wall height is greater than or equal to 8m belongs to high retaining wall, and what the wall height exceeds 15m is super high retaining wall. Rigid retaining walls are the most commonly used form, mainly because of their ease of construction and the wide range of construction material sources. However, the design of the rigid retaining wall is not more than 6m, and if the higher retaining wall adopts a rigid retaining wall structure, the structural section of the retaining wall is inevitably required to be increased for ensuring the stability of the retaining wall, so that the requirement on the bearing capacity of the foundation of the retaining wall is not economic and can be improved. In order to meet the requirements of foundation bearing capacity, economy and the like, the structural form of the retaining wall is also continuously optimized, and the application of structures such as a buttress type light retaining wall and the like is gradually wide.

The counterfort retaining wall is a reinforced concrete thin-wall retaining wall, and is mainly characterized by simple structure, convenient construction, smaller wall body section, light weight, better performance of the strength of the material, adaptability to the foundation with lower bearing capacity, suitability for the areas lacking stone materials, and generally adoption of a higher filling road section to stabilize the backfilling slope so as to reduce the engineering quantity of the earth and stone and the floor area. The counterfort type retaining wall is small in section size, the gravity of the soil body on the counterfort plate can effectively resist overturning and sliding, the panel and the counterfort plate bear bending moment and shearing force generated by soil pressure together, the stress performance is good, the counterfort type retaining wall is suitable for filling side slopes with the height of 6-12 m, and the filling side slopes can be effectively prevented from sliding.

In the prior art, buttress retaining walls are common, for example, patent CN108487303A of the university of architecture in shandong discloses a combined retaining wall of a support pile and a buttress retaining wall and a construction method thereof, comprising: when a foundation pit is excavated, supporting piles and buttress retaining walls; the supporting piles comprise a plurality of supporting piles which are arranged in a row, the top of each supporting pile is provided with a crown beam which connects the supporting piles into a whole, the upper part of the buttress retaining wall is connected with the supporting piles through connecting beams, and the lower part of the buttress retaining wall is connected with the supporting piles through a bottom plate. However, when the structure is used in river levee supporting engineering, the upper load of the retaining wall is basically consistent with the upper load of the supporting pile, and the problem of uneven settlement is solved. In addition, utility model patent CN208088332U of medium-speed railway engineering consulting group limited company discloses a counterfort formula retaining wall, including shingle nail, wall heel board, wall toe board and counterfort, be equipped with the preformed hole on wall heel board or the wall toe board, the preformed hole is located the position of the wall heel board or the coincidence of wall toe board of other engineering pile foundations and counterfort formula retaining wall, other engineering pile foundations set up in the preformed hole. The scheme sets the reserved holes on the heel plate or the toe plate of the counterfort retaining wall, thereby avoiding additional drilling when other engineering pile foundations are positioned on the heel plate or the toe plate of the counterfort retaining wall.

However, the existing retaining wall with buttress type in the prior art still has many problems, for example, under the action of high soil pressure behind the wall back, the bending moment born by the panel and the heel plate and the tensile force born by the buttress plate tend to be larger, the structural section of the corresponding part needs to be reinforced and enlarged, and the section bar needs to be increased. In addition, conventional buttress formula retaining wall generally sets up the wash port according to the determining deviation on the panel, and the wash port drill way sets up the anti-package of straining, only arranges in the wash port drill way because of the anti-package of straining, leads to the drainage ability of drainage hole limited under the torrential rain operating mode, and underground water level harms the height behind the wall, produces great water pressure to the retaining wall structure, and the safety of retaining wall structure is endangered to serious meeting. Therefore, the prior art of the counterfort retaining wall is still imperfect, and needs to be improved, how to ensure the economical efficiency of the counterfort retaining wall, and through the structure optimization and adjustment, the strength of the structural material is exerted to the greatest extent, the capability of bearing the soil pressure is improved, and the influence of underground water is reduced, which is the key of the ultrahigh counterfort retaining wall for being applicable to a higher engineering application range.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems that the conventional buttress retaining wall is easy to cause larger structural engineering quantity and investment due to the height increase of the wall, is easy to be influenced by underground water greatly, causes narrower application range and is not suitable for applying an ultrahigh filling side slope supporting structure, the utility model provides an ultrahigh buttress retaining wall supporting structure, the structure is provided with unloading plates which are vertically graded according to a certain height on the back of a panel of a conventional counterfort retaining wall, the unloading plates are lapped with adjacent counterfort plates, the backfill material on the back of the wall is unloaded and decompressed in a grading way, the capability of bearing the soil pressure is improved, a drain hole is arranged on the panel, the back of the panel is provided with the geotechnical mat drainage layer and the back filtering gravel layer, which can quickly drain accumulated water at the back of the wall, reduce the underground water level, avoid the adverse effect caused by overlarge water pressure, the economy of the ultrahigh counterfort retaining wall is guaranteed, the overall safety of the structure is guaranteed, and the engineering application range of the retaining wall can be widened.

The utility model is realized by the following steps:

a kind of ultra-high counterfort retaining wall supporting construction, including face plate, toe board, heel board and counterfort board that are the reinforced concrete structure, pack with the backfill behind the retaining wall structure; the back of the panel is vertically provided with unloading plates in a grading manner, and each unloading plate forms an unloading pressure reducing platform; the unloading plate is overlapped with the adjacent buttress plate; a plurality of PVC drain pipes are arranged on the panel from bottom to top, and a drain layer and a back filtering gravel layer which are formed by geotechnical mats are arranged next to the back of the panel to form a whole surface layer back filtering drain passage; set up the bed course bottom retaining wall structure, the retaining wall top sets up the escape canal next to the panel.

Furthermore, the vertical distance between each stage of unloading plates is 5-8 m.

Furthermore, the aperture of the drain pipe is between 80 and 110mm, the pitch is between 2 and 3m,

further, the thickness of the geotechnical mat is 10cm, and the geotechnical mat is constructed by melting and lapping the mess; the thickness of the anti-filtering gravel layer is 30-50 cm.

Furthermore, the cushion layer is made of C15 concrete and has the thickness of 15-20 cm.

Compared with the prior art, the utility model has the following effects:

(1) the unloading plates are vertically arranged on the back of the panel of the conventional counterfort retaining wall in a grading manner according to a certain height, the unloading plates are lapped with the adjacent counterfort plates, the backfill soil pressure on the unloading plates can not be transmitted to the lower parts of the unloading plates, each stage of unloading plates naturally forms an unloading pressure reducing platform to carry out grading unloading pressure reduction on the soil pressure on the back of the retaining wall, the self structural material strength of each part of the counterfort retaining wall can be fully exerted, and the increase of engineering quantity and investment caused by overlarge structural size due to stress concentration is avoided.

(2) The backfill on the unloading plate increases the dead weight of the counterfort retaining wall, greatly increases the resistance of the retaining wall to overturning and sliding and ensures the stability of the retaining wall structure under the high backfill side slope.

(3) The panel has set up the wash port to set up geotechnological mat drainage blanket and anti-gravel layer of straining at the panel back, form whole surface course and counter-strain drainage channel, avoided blockking up, ponding behind the wall back of the body can discharge fast effectively reduces ground water level, avoids the too big adverse effect that causes of water pressure, guarantees the holistic safety of retaining wall structure.

(4) The ultrahigh counterfort retaining wall has the advantages that the economical efficiency of the ultrahigh counterfort retaining wall is guaranteed, the capability of bearing soil pressure is improved, the influence of underground water is reduced, the integral safety of the structure is guaranteed, and the engineering application range of the retaining wall can be greatly improved.

Drawings

FIG. 1 is a cross-sectional view of an exemplary embodiment of the present invention;

fig. 2 is a three-dimensional structure view of the buttress retaining wall of the present invention.

Description of reference numerals: 1-a panel; 2-toe board; 3-a heel plate; 4-a buttress plate; 5-unloading plate; 6-geotechnical mat; 7-anti-filtering the crushed stone layer; 8-a drain pipe; 9-backfill; 10-a cushion layer; 11-drainage ditch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, the present invention is implemented as follows:

the ultrahigh buttress retaining wall is the same as the conventional buttress retaining wall and is provided with a panel 1, a toe board 2, a heel board 3 and a buttress board 4, wherein each board is of a reinforced concrete structure, the concrete strength grade is not lower than C35, and the structure thickness and reinforcing bars can be determined according to stress calculation. The face plate 1 serves as a soil guard, the toe plates 2 can significantly increase the anti-overturning stability of the retaining wall and reduce the contact stress of the substrate, and the retaining wall ensures the stability of the supporting structure by means of the gravity and the self-weight of the backfill 9 on the heel plate 3.

The back of the panel 1 is provided with the unloading plates 5 in a vertical grading mode according to a certain height, when the height of the retaining wall is high, the grading number of the unloading plates 5 is increased properly, and the vertical distance between every two unloading plates is preferably 5-8 m. The unloading plate 5 is lapped with the adjacent wall supporting plate 4, the soil pressure of backfill 9 on the unloading plate 5 cannot be transmitted to the lower part of the unloading plate 5, and each stage of unloading plate 5 forms an unloading pressure reducing platform which can carry out graded unloading pressure reduction on the soil backing pressure of the retaining wall.

Panel 1 sets up

PVC drain pipe

8, and 8 apertures of drain pipe are between 80 ~ 110mm, and the interval is apart from between 2 ~ 3m, and 1 back of being close to panel sets up geotechnological mat 6 drainage blanket and anti-rubble layer 7 of straining, forms whole surface course anti-drainage channel of straining, can discharge the ponding behind the wall back fast, effectively reduces ground water level. The geotechnical mat 6 is 10cm thick, is a drainage structure formed by novel geosynthetic materials formed by melting and lapping of the disordered yarns, has high pressure resistance and large pore density, has the function of omnibearing water collection and drainage, and prevents fine particles from being brought into the geotechnical mat 6 to cause blockage because the reverse filtering gravel layer 7 is 30-50 cm thick.

Retaining wall structure concrete reaches above 70% intensity and can carry out the construction of wall back backfill 9, and backfill 9 should be layered and rolled closely knit, and the synchronous construction of anti-rubble layer 7 and backfill 9, for preventing the retaining wall structure from damaging, the transport equipment and the rolling equipment should be far away from structure 1.5m, and the peripheral backfill 9 of structure adopts artifical the paving, adopts small-size compactor to roll closely knit.

Retaining wall structure bottom sets up bed course 10, and bed course 10 adopts C15 concrete, and thickness 15 ~ 20cm makes the basal plane level be convenient for ligature reinforcing bar on it, also plays the effect of protective structure basis.

Retaining wall top is close to panel 1 and sets up escape canal 11, and the setting of escape canal 11 can in time be effectively with the domatic rainwater of side slope outside leading to the field, avoids domatic rainwater to excrete not smooth to infiltration and produces adverse effect to the structure.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an ultrahigh counterfort retaining wall supporting construction which characterized in that: comprises a face plate (1), toe plates (2), heel plates (3) and a buttress plate (4) which are all of reinforced concrete structures, and backfill (9) is filled behind a retaining wall structure; the back of the panel (1) is vertically provided with unloading plates (5) in a grading manner, and each unloading plate (5) forms an unloading pressure-reducing platform; the unloading plate (5) is overlapped with the adjacent supporting wall plate (4); a plurality of PVC drain pipes (8) are arranged on the panel (1) from bottom to top, and a drainage layer and a back filtering gravel layer (7) which are formed by geotechnical mat pads (6) are arranged on the back of the panel (1) next to the panel to form a whole surface layer back filtering drainage channel; set up bed course (10) bottom retaining wall structure, retaining wall top is close to panel (1) and sets up escape canal (11).

2. The ultra-high buttress-type retaining wall supporting structure according to claim 1, wherein: the vertical distance between every two unloading plates (5) is 5-8 m.

3. The ultra-high buttress-type retaining wall supporting structure according to claim 1, wherein: the aperture of the drain pipe (8) is between 80 and 110mm, the interval is between 2 and 3m,

4. the ultra-high buttress-type retaining wall supporting structure according to claim 1, wherein: the thickness of the geotechnical mat (6) is 10cm, and the geotechnical mat is constructed by melting and lapping the disordered wires; the thickness of the anti-filtering gravel layer (7) is 30-50 cm.

5. The ultra-high buttress-type retaining wall supporting structure according to claim 1, wherein: the cushion layer (10) is made of C15 concrete and is 15-20 cm thick.