CN112411287B

CN112411287B - Construction method for environment-friendly soil solidification and improvement of silty clay roadbed

Info

Publication number: CN112411287B
Application number: CN202011255230.4A
Authority: CN
Inventors: 聂志强; 廖汉武; 龚敏; 周喜民; 王峰
Original assignee: Hunan Cebo Traffic Engineering Co ltd
Current assignee: Hunan Cebo Traffic Engineering Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2022-04-19
Anticipated expiration: 2040-11-11
Also published as: CN112411287A

Abstract

The invention discloses a construction method for an environment-friendly soil solidification and improvement of a silty clay roadbed, belonging to the technical field of roadbeds and comprising the following steps: s1, measuring and lofting; s2, substrate treatment: cleaning up impurities and barriers on the original ground within the roadbed according to the sidelines, manually removing surface water, leveling the ground surface, and rolling and compacting to obtain a substrate; s3, mounting a buffer device: mounting a plurality of cushioning devices on a substrate; s4, layered filling: discharging piles and filling sidelines in the roadbed, and then paving a gravel layer, wherein the thickness of the gravel layer is larger than the height of the buffer device; laying powdery clay improved by a curing agent after the gravel layer is laid; s5, paving and leveling: paving and primarily leveling by a bulldozer according to a loose paving marking line, and finely leveling by a leveler to form a road arch; s6, sprinkling water and airing; and S7, rolling and tamping. The invention has good quality of the filled roadbed, improves the driving safety and prolongs the service life of the roadbed.

Description

Construction method for environment-friendly soil solidification and improvement of silty clay roadbed

Technical Field

The invention relates to the technical field of roadbed, in particular to an environment-friendly soil solidification construction method for improving silty clay roadbed.

Background

The roadbed is a foundation of a track or a road surface and is an earth structure formed by excavation or filling. The roadbed mainly has the functions of providing necessary conditions for track or road surface laying and train or traveling operation, bearing static load and dynamic load of track and locomotive vehicle or road surface and traffic load, and transmitting and diffusing the load to the deep part of the foundation. On the longitudinal section, the roadbed must ensure the required elevation of the line; on the plane, the roadbed, the bridge and the tunnel are connected to form a complete through line. In civil engineering, the subgrade occupies an important position in the aspects of construction quantity, floor area and investment.

The silty clay is cohesive soil with a plasticity index of 10-17 according to GB50007-2011 specifications; or clay with 30-50% clay content and more sand content according to the 1962 specification of the department of water and power.

Due to the timeliness of the soft soil deformation, when a structure is built on a soft soil foundation, the settlement amount may gradually increase along with the time, so that the structural stability of the structure and the like are caused to be problematic, the normal use of the structure is influenced, and even the structure is damaged and collapsed to cause serious accidents.

In view of the above, the present invention aims to provide a construction method for solidifying and improving silty clay road base by using environment-friendly soil.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an environment-friendly soil solidification construction method for improving silty clay roadbed.

In order to achieve the purpose, the invention provides the following technical scheme:

an environment-friendly soil solidification and improvement silty clay roadbed construction method comprises the following steps:

s1, measurement lofting: discharging boundary lines and drainage ditch lines on two sides of the roadbed, and marking;

s2, substrate treatment: cleaning up impurities and barriers on the original ground within the roadbed according to the sidelines, manually removing surface water, leveling the ground surface, and rolling and compacting to obtain a substrate;

s3, mounting a buffer device: a plurality of buffer devices are arranged on a substrate, and are uniformly distributed on the substrate and fixed through bolts;

s4, layered filling: discharging piles and filling sidelines in the roadbed, and then paving a gravel layer, wherein the thickness of the gravel layer is larger than the height of the buffer device, so that the buffer device is buried in the gravel layer; laying powdery clay improved by a curing agent after the gravel layer is laid;

s5, paving and leveling: paving and primarily leveling by a bulldozer according to a loose paving marking line, and finely leveling by a leveler to form a road arch;

s6, sprinkling water and airing: checking the drainage quantity of the filler, spraying water and airing according to the condition of the filler, and rolling at the optimal water content;

s7, rolling and tamping: and (3) compacting by the road roller, wherein the running speed of the road roller is lower than 4km/h, and the road roller is rolled in a mode of firstly approaching, secondly moving, firstly accelerating, secondly decelerating, longitudinally reaching the bottom, transversely reaching the edge and overlapping wheel tracks.

More preferably: in step S2, the substrate depth is not less than 15cm, and the degree of compaction is not less than 90%.

More preferably: the buffer device comprises a shell, a buffer plate, a lifting plate, a cooperation mechanism and a lifting mechanism;

the surface of the shell is fixedly provided with an installation plate, the installation plate is provided with an installation hole, and the shell is installed on a substrate through the installation plate;

the lifting plate is located on one side of the buffer plate, the buffer plate and the lifting plate are located above the shell, the height of the buffer plate is higher than that of the lifting plate, the cooperation mechanism is installed in the shell and connected with the buffer plate, and the lifting mechanism is installed in the shell and connected with the lifting plate.

More preferably: the cooperation mechanism comprises a wedge block, a moving platform, a screw rod and a spring;

the screw rod is positioned in the shell, two ends of the screw rod are respectively inserted into the inner walls of two opposite sides of the shell, the moving platform is sleeved on the screw rod and is in threaded fit with the screw rod, and the spring is sleeved on the screw rod and tightly propped between the moving platform and the inner wall of the shell;

inclined planes are arranged at the bottom of the wedge block and the top of the mobile platform, the upper part of the wedge block penetrates through the shell and is fixed at the bottom of the buffer plate, and the lower part of the wedge block is in contact with the inclined plane at the top of the mobile platform through the inclined plane at the bottom of the wedge block, so that the wedge block is supported on the mobile platform.

More preferably: the bottom of the moving platform is provided with a sliding block, the bottom in the shell is provided with a sliding groove, the length direction of the sliding groove is the same as the axial direction of the screw rod, and the sliding block is inserted in the sliding groove and is in sliding fit with the sliding groove.

More preferably: the bottom of the wedge block is provided with a groove, and the groove is positioned in the center of the bottom of the wedge block.

More preferably: the lifting mechanism comprises a rack and a gear, the gear is sleeved on the screw rod and fixedly connected with the screw rod, and the spring and the gear are respectively positioned on two opposite sides of the mobile platform;

the rack is located on one side of the gear and meshed with the gear, and the upper end of the rack penetrates through the shell and is fixed to the bottom of the lifting plate.

More preferably: the lifting mechanisms and the cooperation mechanisms are respectively provided with two, the positions of the two lifting mechanisms and the positions of the two cooperation mechanisms are in one-to-one correspondence, the two lifting mechanisms are respectively fixed on the lifting plate, and the two cooperation mechanisms are respectively fixed on the buffer plate.

More preferably: the buffer plate and the lifting plate are both embedded in the gravel layer.

In conclusion, the invention has the following beneficial effects: the invention mainly has the following two characteristics:

the filler is paved above the crushed stone layer by adopting the environment-friendly powdered clay which is solidified and improved by soil, so that the powdered clay can be effectively utilized, the use value of the powdered clay is improved, the basic balance of earthwork in a field is achieved, the economy and the high efficiency are realized, and the quality of the filled roadbed is excellent.

Secondly, at the interior buffer gear of installation of rubble layer, the road surface load is too big, or when the downward emergence of road surface subsides, buffer board and lifting board will play the effect of better support, buffering, prevent that diseases such as the subgrade from appearing collapsing, subsiding, reduce the subgrade deformation, improve driving safety and subgrade life.

Drawings

FIG. 1 is a flow chart of an embodiment, which is mainly used for embodying a construction method of a roadbed;

FIG. 2 is a schematic structural diagram of an embodiment, which is mainly used for embodying an external structure of a buffer device;

FIG. 3 is a schematic structural diagram of an embodiment, which is mainly used for embodying the internal structure of the buffer device;

FIG. 4 is a schematic structural diagram of an embodiment, which is mainly used for embodying the structure of a cooperative mechanism;

fig. 5 is a schematic structural diagram of the embodiment, which is mainly used for embodying the structure of the wedge block.

In the figure, 1, a housing; 2. mounting a plate; 3. mounting holes; 4. a buffer plate; 5. lifting the plate; 6. a cooperation mechanism; 61. a wedge block; 62. a mobile station; 63. a screw rod; 64. a spring; 65. a slider; 66. a groove; 71. a rack; 72. a gear.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example (b): an environment-friendly soil solidification and improvement silty clay roadbed construction method is shown in figure 1, and comprises the following steps:

s1, measuring and lofting

And (4) performing on-site burst measurement lofting by the measurement group, and releasing boundary lines and drainage ditch lines on two sides of the roadbed and marking.

S2, substrate processing

According to the boundary line, the manual matching excavator is used for cleaning sundries and obstacles on the original ground in the roadbed range, such as weeds, tree roots, surface layer soft soil and the like, and transporting the waste soil to a waste soil field by using a dump truck. Manually removing surface water, airing the foundation soil, leveling the ground surface by using a bulldozer when the water content reaches the optimum water content determined by the test, and compacting to obtain the foundation with the depth of not less than 15cm and the compaction of not less than 90%.

S3 installation buffer device

A plurality of buffer devices are arranged on the substrate, and are uniformly distributed on the substrate and fixed through bolts. The plurality of buffer devices are distributed in a rectangular array, and the distance between every two adjacent buffer devices is not more than 2 m.

As shown in fig. 2 to 5, the damping device includes a housing 1, a damping plate 4, a lifting plate 5, a cooperating mechanism 6, and a lifting mechanism. Casing 1 is the rectangle form, and 1 external surface of casing is fixed with mounting panel 2, and mounting panel 2 is provided with four, and four mounting panels 2 are located the relative both sides of casing 1 respectively and are close to four contained angles of casing 1 respectively. The mounting plate 2 is provided with a mounting hole 3, the axis direction of the mounting hole 3 is vertical, and the bolt is mounted in the mounting hole 3, so that the shell 1 is firmly arranged on the substrate through the mounting plate 2.

As shown in fig. 2 to 5, the lifting plate 5 is located on one side of the buffer plate 4, the buffer plate 4 and the lifting plate 5 are both located above the housing 1, and the height of the buffer plate 4 is greater than that of the lifting plate 5, so that the buffer plate 4 is located above the lifting plate 5. The cooperating mechanism 6 is mounted in the housing 1 and connected to the buffer plate 4, and the lifting mechanism is mounted in the housing 1 and connected to the lifting plate 5. The cooperating mechanism 6 includes a wedge 61, a moving table 62, a lead screw 63, and a spring 64. The screw 63 is located in the casing 1, and two ends of the screw are respectively inserted into the inner walls of two opposite sides of the casing 1, preferably, the length direction of the screw 63 is parallel or nearly parallel to the width direction of the roadbed. The movable table 62 is sleeved on the screw rod 63 and is in threaded fit with the screw rod 63, and the spring 64 is sleeved on the screw rod 63 and tightly abuts between the movable table 62 and the inner wall of the shell 1. Preferably, one end of the spring 64 is fixed to the side of the movable stage 62, and the other end is fixed to the inner wall of the housing 1, and the spring 64 is located on the higher side of the bottom surface of the wedge 61.

As shown in fig. 2-5, the bottom of the wedge 61 and the top of the movable stage 62 are provided with inclined surfaces, and the inclined surfaces on the wedge 61 are matched with the inclined surfaces on the movable stage 62, so that the wedge 61 is in surface-to-surface contact with the movable stage 62. The wedge 61 is inserted through the housing 1 at the upper portion and fixed to the bottom of the buffer plate 4, and the lower portion is in surface contact with the inclined surface of the top of the moving stage 62 through the inclined surface of the bottom of the wedge 61, so that the wedge 61 is supported on the moving stage 62.

In the above technical solution, when the road surface load is too large or the road surface sinks downward, the buffer plate 4 will receive a downward force, and at this time, the buffer plate 4 will drive the wedge 61 to move downward, and since the wedge 61 contacts with the moving stage 62 through the inclined surface and the spring 64 abuts against between the moving stage 62 and the inner wall of the housing 1, when the wedge 61 moves downward, the moving stage 62 will move toward the spring 64. And because the movable table 62 is in threaded fit with the screw rod 63, when the movable table 62 moves, the screw rod 63 rotates around the central axis of the shell 1, so that a good buffering effect can be achieved, the deformation of the roadbed is reduced, the driving safety is improved, and the service life of the roadbed is prolonged.

As shown in fig. 2-5, the bottom of the moving table 62 is provided with a sliding block 65, the bottom of the casing 1 is provided with a sliding groove, the length direction of the sliding groove is the same as the axial direction of the screw 63, and the sliding block 65 is inserted into the sliding groove and is in sliding fit with the sliding groove.

In the above technical solution, when the wedge 61 pushes the moving table 62 toward the normal direction of the inclined plane, the moving table 62 can move along the sliding groove, so that the sliding stability of the moving table 62 is improved, and the connection strength between the moving table 62 and the housing 1 is improved.

As shown in fig. 2-5, when the wedge 61 continuously moves downward, it may collide with the screw 63, so that the wedge 61 cannot continuously move downward, and in order to prevent the screw 63 from interfering with downward movement of the wedge 61, the present invention provides a groove 66 at the bottom of the wedge 61, wherein the groove 66 is located at the bottom center of the wedge 61 and corresponds to the screw 63 up and down. In this way, when the wedge 61 continues to move downward, the screw 63 can be accommodated in the groove 66, and the screw 63 is prevented from interfering with the movement of the wedge 61.

As shown in fig. 2-5, the lifting mechanism includes a rack 71 and a pinion 72. The gear 72 is sleeved on the screw 63 and fixedly connected with the screw 63, and the spring 64 and the gear 72 are respectively positioned at two opposite sides of the moving platform 62. The rack 71 is located on one side of the gear 72 and meshed with the gear 72, and the upper end of the rack 71 penetrates through the shell 1 and is fixed with the bottom of the lifting plate 5. The lifting mechanisms and the cooperation mechanisms 6 are respectively provided with two, the positions of the two lifting mechanisms and the positions of the two cooperation mechanisms 6 are in one-to-one correspondence, the two lifting mechanisms are respectively fixed on the lifting plate 5, and the two cooperation mechanisms 6 are respectively fixed on the buffer plate 4.

In the above technical scheme, when the buffer plate 4 moves downwards under external force, the screw 63 rotates to drive the gear 72 to rotate, and because the gear 72 is matched with the rack 71, when the gear 72 rotates, the rack 71 drives the lifting plate 5 to move upwards, so that better supporting and supporting effects can be achieved. And the defects of collapse, settlement and the like of the roadbed are prevented.

S4, layered filling

After the buffering device is installed, piles and filling sidelines in the roadbed are placed out, then a gravel layer is laid, the thickness of the gravel layer is larger than the height of the buffering device, so that the buffering device is buried in the gravel layer, and the buffering plate and the lifting plate are buried in the gravel layer. And laying the powdery clay improved by the curing agent after the gravel layer is laid.

S5, spreading and leveling

The bulldozer paves and primarily levels the road according to the loose paving marking line, and the grader finely levels the road to form a road arch.

S6, sprinkling water and airing

Checking the water discharge amount of the filler, spraying water and airing according to the condition of the filler, and rolling at the optimal water content.

S7 rolling and tamping

And (3) compacting by the road roller, wherein the running speed of the road roller is lower than 4km/h, and the road roller is rolled in a mode of firstly approaching, secondly moving, firstly accelerating, secondly decelerating, longitudinally reaching the bottom, transversely reaching the edge and overlapping wheel tracks.

Specifically, rolling is started when the loose paving thickness and the flatness meet the requirements. And the rolling adopts a vibratory roller with exciting force of 35 t. Rolling from two sides to the center in a longitudinal advancing and retreating mode according to the principle of 'firstly stabilizing and then vibrating ← firstly accelerating and then decelerating, longitudinally reaching the bottom, transversely reaching the side and overlapping wheel tracks': and carrying out static pressing once, then carrying out weak vibration rolling twice, and then carrying out strong vibration rolling once to finish primary rolling. When rolling, the row track and the row track are overlapped by 0.4-0.5 m, the joint of the horizontal same layer is overlapped by 0.4-0.5 m, and the adjacent two sections are longitudinally overlapped by 1-1.5 m, so that no pressure leakage and dead angle are ensured, and the rolling uniformity is ensured.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.

Claims

1. An environment-friendly soil solidification and improvement silty clay roadbed construction method is characterized in that: the method comprises the following steps:

s7, rolling and tamping: compacting by a road roller, wherein the running speed of the road roller is lower than 4km/h, and rolling is carried out in a mode of firstly approaching, then distancing, firstly accelerating and then decelerating, longitudinally reaching the bottom, transversely reaching the edge and overlapping wheel tracks; the buffer device comprises a shell (1), a buffer plate (4), a lifting plate (5), a cooperation mechanism (6) and a lifting mechanism;

the surface of the shell (1) is fixedly provided with an installation plate (2), the installation plate (2) is provided with an installation hole (3), and the shell (1) is installed on a substrate through the installation plate (2);

the lifting plate (5) is positioned on one side of the buffer plate (4), the buffer plate (4) and the lifting plate (5) are both positioned above the shell (1), the buffer plate (4) is higher than the lifting plate (5), the cooperation mechanism (6) is installed in the shell (1) and connected with the buffer plate (4), and the lifting mechanism is installed in the shell (1) and connected with the lifting plate (5);

the cooperation mechanism (6) comprises a wedge block (61), a moving platform (62), a screw rod (63) and a spring (64);

the screw rod (63) is positioned in the shell (1), two ends of the screw rod are respectively inserted into the inner walls of two opposite sides of the shell (1), the moving platform (62) is sleeved on the screw rod (63) and is in threaded fit with the screw rod (63), and the spring (64) is sleeved on the screw rod (63) and is tightly abutted between the moving platform (62) and the inner wall of the shell (1);

the bottom of the wedge block (61) and the top of the moving platform (62) are provided with inclined surfaces, the upper part of the wedge block (61) penetrates through the shell (1) and is fixed at the bottom of the buffer plate (4), and the lower part of the wedge block (61) is contacted with the inclined surface at the top of the moving platform (62) through the inclined surface at the bottom of the wedge block (61), so that the wedge block (61) is supported on the moving platform (62);

a sliding block (65) is arranged at the bottom of the moving platform (62), a sliding groove is arranged at the bottom in the shell (1), the length direction of the sliding groove is the same as the axial direction of the screw rod (63), and the sliding block (65) is inserted into the sliding groove and is in sliding fit with the sliding groove;

the lifting mechanism comprises a rack (71) and a gear (72), the gear (72) is sleeved on the screw rod (63) and is fixedly connected with the screw rod (63), and the spring (64) and the gear (72) are respectively positioned at two opposite sides of the mobile platform (62);

the rack (71) is positioned on one side of the gear (72) and meshed with the gear (72), and the upper end of the rack (71) penetrates through the shell (1) and is fixed with the bottom of the lifting plate (5).

2. The method for constructing the environment-friendly soil-solidified powdery clay roadbed as claimed in claim 1, wherein the method comprises the following steps: in step S2, the substrate depth is not less than 15cm, and the degree of compaction is not less than 90%.

3. The method for constructing the environment-friendly soil-solidified powdery clay roadbed as claimed in claim 1, wherein the method comprises the following steps: a groove (66) is formed in the bottom of the wedge block (61), and the groove (66) is located in the center of the bottom of the wedge block (61).

4. The method for constructing the environment-friendly soil-solidified powdery clay roadbed as claimed in claim 1, wherein the method comprises the following steps: the lifting mechanisms and the cooperation mechanisms (6) are respectively provided with two, the two lifting mechanisms and the two cooperation mechanisms (6) are in one-to-one correspondence, the two lifting mechanisms are respectively fixed on the lifting plate (5), and the two cooperation mechanisms (6) are respectively fixed on the buffer plate (4).

5. The method for constructing the environment-friendly soil-solidified powdery clay roadbed as claimed in claim 1, wherein the method comprises the following steps: the buffer plate (4) and the lifting plate (5) are buried in the gravel layer.