CN218374011U - Easy-to-collapse roadbed construction wall structure - Google Patents

Abstract

The utility model provides an easy section road bed construction wall structure that collapses, include: the lower part of the retaining wall is provided with a plurality of precast tubular piles, and the precast tubular piles form a supporting component for supporting the retaining wall; a backfilling area is arranged on one side of the retaining wall, and a C20 concrete seal layer, a bagged gravel layer and a first backfill cohesive soil layer are arranged in the backfilling area from bottom to top; the bagged crushed stone layer is used for filling a backfill region; the C20 concrete seal layer is used for sealing the part, below the backfilling area, of the backfilling area, where the water enters; a drainage pipe group is arranged in the same height area of the retaining wall and the bagged gravel layer and is used for draining the water permeating in the bagged gravel layer; the concrete sealing layer is characterized by further comprising a second backfill cohesive soil layer located below the C20 concrete sealing layer. The utility model discloses optimize the improvement to the retaining wall, under the abominable meteorological condition such as heavy rainfall, still can guarantee its security.

Description

Easy-to-collapse roadbed construction wall structure

Technical Field

The utility model relates to a road bed construction technical field especially relates to an easy section road bed construction wall structure that collapses for complicated geological conditions.

Background

At present, the construction of basic industries such as water conservancy, energy, transportation and the like is vigorously developed in China, projects such as water conservancy, hydropower, railways, urban underground transportation and the like contain a large amount of roadbed construction, are influenced by factors in aspects of subjectivity, objectivity and the like, the condition of roadbed collapse occurs occasionally, light persons cause meaningless waste of a large amount of materials and labor, and heavy persons delay the project period and even endanger the life safety of operating personnel. Particularly, the soil environment is poor, the collapse problem is more prominent in the roadbed construction process, the collapse treatment is very difficult when the collapse is influenced by fault broken zones, weak surrounding rocks, abundant underground water or other adverse factors, and the repeated collapse treatment often occurs, so that a large amount of manpower, material resources and time are consumed, the engineering investment is increased, and the engineering construction period is delayed. Therefore, it is necessary to design a technical means for safely and quickly treating the landslide of the roadbed.

In order to consider collapse, the existing method simply considers that a retaining wall is directly added, but construction rainwater is too much in winter every year, so that the landslide area is increased; the retaining wall has unsmooth site drainage, low road bed treatment efficiency and large organization difficulty. In addition, the geological conditions are complex, the depths of soft soil layers are different, the roadbed treatment difficulty is high along with boulders, stone shoots and the like, the field dynamic compaction replacement and the anti-skid retaining wall construction are mutually interfered, and the construction period pressure is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a roadbed construction wall structure at a collapse-prone section, which is used for complex geological conditions, and because the section of the geological conditions are complex, the side slope soil body is unstable, and a large area landslide is influenced by rainwater for many times, which brings great difficulty to the subsequent construction; adopt good wall structure, through the structural design to the backfill soil layer in backfill region to and optimize the improvement to retaining wall, under environments such as running into strong rainstorm, the security is higher.

Realize the utility model discloses the technical scheme of purpose as follows:

a easy-collapse section roadbed construction wall structure comprises:

the retaining wall comprises a retaining wall body, wherein a plurality of precast tubular piles are arranged at the lower part of the retaining wall body, and form a supporting assembly for supporting the retaining wall body;

a backfilling area is arranged on one side of the retaining wall, and a C20 concrete seal layer, a bagged gravel layer and a first backfill cohesive soil layer are arranged in the backfilling area from bottom to top;

the bagged crushed stone layer is used for filling a backfill region; the C20 concrete seal layer is used for sealing water from the first backfill region penetrating through the bagged gravel layer; the C20 concrete seal is used for sealing the lower part of the backfill region, which is penetrated by water and enters the backfill region;

a water drainage pipe group is arranged in the same height area of the retaining wall and the bagged gravel layer and is used for draining the water in the bagged gravel layer;

the concrete sealing layer further comprises a second backfill viscous soil layer located below the C20 concrete sealing layer. The C20 concrete seal layer is used for sealing water from the backfill area penetrating through the bagged gravel layer, preventing the water from penetrating into the lower portion of the backfill area, and meanwhile, guiding and beating the penetrating water to the outside of the retaining wall through the drain pipe according to a set gradient.

In a preferred embodiment of the present invention, the drainage pipe set comprises at least two sets of drainage pipes which are horizontally parallel, the inclination of the drainage pipe is consistent with the inclination of the C20 concrete seal, and the vertical height of the drainage pipe is higher than the vertical height of the C20 concrete seal.

In a preferred embodiment of the present invention, the surface of the first backfill cohesive soil layer is further provided with a foreign soil spray-seeding net.

In a preferred embodiment of the present invention, the precast tubular pile is used for ground stabilization and for anti-overturning of a retaining wall, and is adjacent to the precast tubular pile with the same transverse distance.

In a preferred embodiment of the utility model, set up three rows of PHC400 precast tubular piles according to interval 1.5 m.

In a preferred embodiment of the utility model, the retaining wall includes first retaining wall body and second retaining wall body, first retaining wall body with the precast tubular pile is connected, second retaining wall body is the slope form, second retaining wall body with backfill regional one side and set up first landslide side slope, second retaining wall body with one side that first retaining wall body is connected sets up second landslide side slope, the upper end of second retaining wall body sets up the escape canal, the escape canal with first backfill cohesive soil layer intercommunication for accept the surface water that first backfill cohesive soil kept apart.

In a preferred embodiment of the present invention, the drainage ditch is composed of a first slope, a vertical slope and a vertical ditch, the first backfill cohesive soil layer is connected to the first slope, and the vertical slope is formed vertically downward by the second soil retaining wall body.

In the utility model discloses a preferred embodiment, the slope is put to first landslide side slope adoption 1:3 slope rate, slope is put to second landslide side slope adoption 1:2 slope rate, the basement of retaining wall adopts PHC400 precast tubular pile to handle.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses an adopt good wall structure, through the structural design to the backfill soil layer of backfilling region to and optimize the improvement to retaining wall, under meetting environment such as heavy rainstorm, the security is higher.

Drawings

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

FIG. 2 is a schematic view of the concrete structure of the bagged soil layer of the present invention;

fig. 3 is a schematic view of the concrete structure of the precast tubular pile of the present invention;

FIG. 4 is a construction drawing of the present invention in a specific construction scenario;

fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise specified, "a plurality" means two or more.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Referring to fig. 1, 2 and 3, a wall structure for roadbed construction at a collapse prone section includes: the retaining wall comprises a retaining wall 100, wherein a plurality of precast tubular piles 200 are arranged at the lower part of the retaining wall 100, and the precast tubular piles 200 form a supporting component for supporting the retaining wall; a backfill region 300 is arranged at one side of the retaining wall 100, and a C20 concrete seal layer 320, a bagged gravel layer 330 and a first backfill cohesive soil layer 340 are arranged in the backfill region 300 from bottom to top; the bagged crushed stone layer is used for filling a backfill region; the C20 concrete seal layer is used for sealing water from the first backfill region penetrating through the bagged gravel layer; a drainage pipe group 350 is arranged in the same height area of the retaining wall 100 and the bagged gravel layer 330, and is used for draining the water in the bagged gravel layer; and a second backfill cohesive soil layer 310 positioned below the C20 concrete seal layer. And the C20 concrete seal layer is used for sealing the lower part of the backfill region, which is penetrated by water and enters the backfill region.

Further, the drainage pipe set 350 includes at least two sets of horizontally parallel drainage pipes 3501, the inclination of the drainage pipe 351 is consistent with the inclination of the C20 concrete envelope 320, and the vertical height of the drainage pipe is higher than that of the C20 concrete envelope.

Referring to fig. 4, further, the surface of the first backfill cohesive soil layer is further provided with an alien soil spray-seeding net 400. The precast tubular piles are used for foundation reinforcement and anti-overturning of a retaining wall, and the transverse distances between adjacent precast tubular piles are the same; in the specific implementation process, three rows of PHC400 precast tubular piles are arranged at an interval of 1.5 m.

The retaining wall 100 comprises a first retaining wall body 101 and a second retaining wall body 102, the first retaining wall body 101 is connected with the precast tubular pile, the second retaining wall body 102 is inclined, the second retaining wall body is provided with a first landslide slope 103 on one side of the backfilling area, the second retaining wall body is provided with a second landslide slope 104 on one side of the first retaining wall body, a drainage ditch 105 is arranged at the upper end of the second retaining wall body, and the drainage ditch is communicated with the first backfill viscous soil layer and is used for bearing the water permeation of the first backfill viscous soil layer.

The drainage ditch 104 is composed of a first slope, a vertical slope and a straight ditch, the first backfilled cohesive soil layer is connected with the first slope, and the vertical slope is formed by the second retaining wall body vertically downwards; correspondingly, the slope of the first landslide side 103 is released at a slope rate of 1:3, the slope of the second landslide side 104 is released at a slope rate of 1:2, the base of the retaining wall is treated by a PHC400 precast tubular pile, and concrete 201 is poured into the precast tubular pile.

Performing slope cutting treatment on the easy-collapse section; mounting the precast tubular pile in the lower area of the easily collapsed section; excavating a foundation pit in the area above the precast tubular pile, and installing a retaining wall support at the corresponding foundation pit; backfilling bagged broken stones at the foundation pit at the upstream of the retaining wall; and backfilling cohesive soil at the bottom of the retaining wall, and rolling and compacting. Excavating a ditch penetrating groove according to the design size strictly, arranging one ditch penetrating groove every 15m, sealing a C20 concrete seal layer at the bottom of the groove, and backfilling bagged broken stones; the back of the retaining wall is backfilled by bagged broken stones, and the top surface of the back of the wall is sealed by clay.

And constructing the retaining wall from two sides to the middle every 5m section, excavating one section of construction, strictly forbidding large-scale excavation, and performing back pressure treatment on slope feet of other construction sections to avoid severe landslide slippage.

Referring to fig. 5, based on the above structure, a process flow is specifically implemented:

construction preparation → measurement lofting → excavation of foundation → foundation construction → wall construction → other auxiliary works (back filling, etc.).

Measuring and lofting: before construction, cross sections in the retaining wall sections are measured and lofted, if the ground line of the wall toe and the designed cross sections come in and go out, field technicians and supervision engineers are informed in time, and the design units are returned for processing.

Secondly, excavation of the foundation pit: and (4) making a temporary drainage facility before excavation, and draining accumulated water in the pit at any time in rainy days. The size, shape and embedding depth of each part of the foundation are constructed according to the design requirements. The foundation pit is excavated by jumping grooves every 5m, large-scale excavation is strictly forbidden after two ends and the middle of the construction sequence, and the slope toe of other non-constructed road sections needs to be subjected to back pressure treatment so as to avoid severe sliding of the landslide.

Treating the pile top: and (3) cleaning pile heads after excavation and leveling of the foundation pit, paving a 5cm back broken stone cushion layer on the foundation, pouring tubular pile core filling concrete, and installing pile top reinforcing steel bars.

Foundation and wall construction: the anti-slip retaining wall body is cast by C20 concrete, and the wall body is constructed in sections. The concrete is horizontally poured in layers. In the wall body construction, 2cm settlement joints are arranged between every two sections of retaining walls along the line direction, asphalt flock is filled in the joints along the wall top, the inner side and the outer side, and the depth of the joints is 20cm. Two rows of retaining wall drain holes are arranged, the distance between the bottom row and the side ditch platform is 50cm, the height between the two rows is 1m, and the distance between two holes in each row is 3m.

Fifthly, supporting the seepage trench and backfilling the wall back: and backfilling cohesive soil at the bottom of the retaining wall according to the design file requirement, and rolling and compacting. Excavating a seepage ditch groove strictly according to the design size, arranging one seepage ditch groove every 15m, sealing a C20 concrete seal layer at the bottom of the ditch groove, and backfilling bagged broken stones; the functions of supporting and water permeating are realized through bagged gravels.

The back of the retaining wall is backfilled by bagged broken stones, and the top surface of the back of the wall is sealed by clay, so that surface water is prevented from infiltrating.

1. The construction sequence is as follows: manually removing slope dangerous stones → constructing slope anchor rods → installing longitudinal and transverse support ropes → laying and sewing steel rope nets.

2. The construction method comprises the following steps:

(1) Cleaning slope

In most cases, hill clearing is not necessary, but the following two cases are considered:

(1) when the floating soil or pumice exists on the slope surface, particularly in the moving range of constructors, the construction safety is threatened by collapse and rolling caused by construction activities, and the construction safety is preferably cleared or temporarily treated on site.

(2) For individual monumental dangerous stones present on the slope surface with a high possibility of future collapse, if their collapse may bring a large maintenance requirement of the system or even exceed the protection capability of the system, they should be suitably supported and reinforced or removed beforehand.

(2) Survey lofting

Determining the hole position of the anchor rod by paying-off measurement, and selecting the hole position of the anchor rod at the valley as far as possible within the adjustment range allowed by the hole spacing; and local anchor rods with the length not less than 0.5m are preferably additionally arranged in anchor rod holes which are not in low recesses or cannot meet the requirement that the system is attached to the slope surface as closely as possible after being installed.

(3) Construction of foundations

The work is mainly to ensure the anchoring capability of the anchor rod, so that the drilling of the anchor rod hole is embodied for the position of bedrock or hard rock, and the excavation of a foundation pit and the pouring of a concrete base can be included for the position of loose rock which can not be directly formed by the hole. Drilling an anchor rod hole according to the designed depth and cleaning the hole, wherein the hole depth is 5-10 cm greater than the designed anchor rod length, and the hole diameter is not less than A42; when limited by rock drilling equipment, two steel ropes forming each anchor rod can be respectively anchored into two anchor holes with the aperture not smaller than A35 to form a herringbone anchor rod, and the included angle between the two steel ropes is 15-30 degrees so as to achieve the same anchoring effect; when the hole can not be formed due to loose or broken bottom layer, the rock-soil section which can not be formed can be replaced by C15 concrete foundation with section size not less than 0.4 multiplied by 0.4.

(4) Anchor rod installation

For the position of the anchor rod with the direct hole, the anchor rod is embedded together with the grouting pipe before grouting, and for the position adopting the concrete foundation, the anchor rod is generally embedded directly while the foundation is poured.

Inserting anchor rod and grouting, adopting mortar with M30 as reference, using 42.5 common Portland cement as cement, preferably selecting medium-fine sand with grain size larger than 3mm, ensuring full slurry, and maintaining slurry for at least three days before next procedure

(5) Lantern ring processing and anchor head sealing

And manufacturing a steel wire rope lantern ring, bending a 50cm long A16 steel wire rope into a ring, and firmly fastening the joint by using 2U-shaped buckles. A pit with a certain depth is drilled at each hole site, and the hole diameter is generally 20cm and the depth is generally 15cm. And hanging the lantern ring on the hook at the tail part of the anchor rod. The top end of the anchor rod exposed lantern ring can not be higher than the ground surface. The pits are closed with C25 fine stone concrete (most of the lantern ring is exposed out of the concrete, and the joint of the lantern ring and the anchor rod hook must be closed in the concrete).

(6) Installation and debugging of support rope

In order to ensure that the support ropes are tightly attached to the ground surface as much as possible after being tensioned, tensioning devices or chain blocks are adopted for tensioning after the longitudinal and transverse support ropes are installed, and two ends of each tensioned support rope are fixedly connected with the anchor rod exposed lantern rings through 2-4U-shaped buckles respectively.

(7) Grid laying

And (3) laying a steel rope net from top to bottom and sewing, and using a phi 8 steel rope as a sewing rope to be matched with the U-shaped clamp and the lantern ring for fixed connection.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. The utility model provides a section road bed construction wall structure that easily collapses which characterized in that includes:

the retaining wall comprises a retaining wall body, wherein a plurality of precast tubular piles are arranged at the lower part of the retaining wall body, and form a supporting assembly for supporting the retaining wall body;

a backfilling area is arranged on one side of the retaining wall, and a C20 concrete seal layer, a bagged gravel layer and a first backfill cohesive soil layer are arranged in the backfilling area from bottom to top;

the bagged crushed stone layer is used for filling a backfill region; the C20 concrete seal layer is used for sealing water from the first backfill region penetrating through the bagged gravel layer;

a drainage pipe group is arranged in the same height area of the retaining wall and the bagged gravel layer and is used for draining the water permeating in the bagged gravel layer;

the concrete sealing layer is characterized by further comprising a second backfill cohesive soil layer located below the C20 concrete sealing layer.

2. The foundation construction wall structure of a collapsible section according to claim 1, wherein the drainage pipe group comprises at least two groups of horizontal parallel drainage pipes, the inclination of the drainage pipes is consistent with that of the C20 concrete seal layer, and the vertical height of the drainage pipes is higher than that of the C20 concrete seal layer.

3. The easy-collapse roadbed construction wall structure according to claim 1, wherein a foreign soil spray-seeding net is further arranged on the surface of the first backfill viscous soil layer.

4. The foundation construction wall structure of a collapse-prone section according to any one of claims 1 to 3, wherein the precast tubular piles are used for foundation reinforcement and for anti-overturning of a retaining wall, and the transverse distances between adjacent precast tubular piles are the same.

5. The foundation construction wall structure of the collapse-prone section is characterized in that three rows of PHC400 precast tubular piles are arranged at a spacing of 1.5 m.

6. The easy-collapse roadbed construction wall structure according to claim 3, wherein the retaining wall comprises a first retaining wall body and a second retaining wall body, the first retaining wall body is connected with the precast tubular pile, the second retaining wall body is inclined, a first landslide slope is arranged on one side of the second retaining wall body and the backfilling area, a second landslide slope is arranged on one side of the second retaining wall body connected with the first retaining wall body, a drainage ditch is arranged at the upper end of the second retaining wall body, and the drainage ditch is communicated with the first backfilling cohesive soil layer and is used for receiving surface water isolated by the first backfilling cohesive soil.

7. The foundation construction wall structure of a section easy to collapse of claim 6, wherein the drainage ditch is composed of a first slope, a vertical slope and a straight ditch, the first backfilled cohesive soil layer is connected with the first slope, and the vertical slope is formed by the second retaining wall body vertically downwards.

8. The foundation construction wall structure of the easy-collapse section is characterized in that the first landslide slope adopts a 1:3 slope rate, the second landslide slope adopts a 1:2 slope rate, and the foundation of the retaining wall is treated by PHC400 precast tubular piles.

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