CN118008324A - Foundation reinforcing device for tunnel penetrating through soft soil stratum - Google Patents

Abstract

The invention discloses a foundation reinforcement device for a tunnel penetrating through a soft soil stratum, which comprises a plurality of pile pipes, wherein a separation device is arranged in the middle of each pile pipe, and the separation devices of the pile pipes are arranged in a manner that the heights of the separation devices of the pile pipes are corresponding to the sections of the tunnel in an avoidance manner. According to the shield cutter head, all the arc-shaped plates move inwards, the clamping blocks are separated from the clamping grooves, and the arc-shaped plates with the reduced outer outline can be pulled out from the upper end pipe, so that obstacles on a path of the shield cutter head can be removed, and abrasion of the cutter head is reduced.

Description

A foundation reinforcement device for tunnels passing through soft soil layers

Technical Field

The invention relates to the technical field of soft soil foundation reinforcement, and in particular to a foundation reinforcement device for a tunnel passing through a soft soil layer.

Background technique

Silt-like soft soil layers are widely distributed in my country's coastal areas. Such layers usually have obvious "three highs and three lows" characteristics, namely: high water content, high compressibility, high sensitivity, low strength, low density, and low permeability. In such layers, since the layers themselves cannot provide sufficient resistance for the tunnels, and the surrounding development activities are frequent in the later period, the tunnels are prone to large deformation and settlement problems. Therefore, the foundation of the tunnel section built in the deep soft soil layer is usually reinforced.

Patent CN107524144A discloses a reinforcement system and method for soft soil foundation before tunnel excavation; by performing grid-type reinforcement on the tunnel crossing area and applying a large number of piles in the soft soil of the crossing area, when the shield machine passes through, the wear on the shield cutterhead is aggravated, making it difficult for the shield machine to excavate.

Summary of the invention

The purpose of the present invention is to solve the shortcomings of the prior art and to propose a foundation reinforcement device for a tunnel passing through a soft soil stratum.

In order to achieve the above object, the present invention adopts the following technical solutions:

A foundation reinforcement device for a tunnel passing through a soft soil layer comprises a plurality of pile pipes, each of which is provided with a separation device in the middle, and the heights of the separation devices of the plurality of pile pipes correspond to the avoidance settings of the tunnel section.

Preferably, the pile pipe comprises an upper end pipe and a lower end pipe, and a clamping groove is provided at the lower end of the inner cavity of the upper end pipe and the upper end of the inner cavity of the lower end pipe respectively;

The separation device comprises a suspension rod, a threaded section is arranged at the upper end of the suspension rod, a sleeve is arranged outside the suspension rod, the sleeve is threadedly connected to the upper end of the suspension rod, a circular ring is arranged at the lower end of the sleeve, a plurality of cross bars are fixedly connected to the lower end of the suspension rod in an array, each cross bar is slidably connected to a sliding sleeve, one end of the sliding sleeve is fixedly connected to an arc plate, all the arc plates can be spliced into a cylindrical structure of different sizes, the upper side of the sliding sleeve is hingedly connected to a support rod, and the upper end of the support rod is hingedly connected to the circular ring;

The upper end and the lower end of the inner arc surface of the arc-shaped plate are respectively fixedly connected to the vertical plate, and the vertical plate is fixedly connected to the clamping block, and the clamping block and the clamping slot are correspondingly arranged.

Preferably, notches and protrusions are alternately arranged on the side surfaces of two adjacent arc-shaped plates, and a slurry outlet hole is formed between the protrusion and the notch.

Preferably, a storage groove is provided on the outer arc surface of one of the arc-shaped plates, and an arc-shaped elastic steel bar is rotatably connected in the storage groove. A slide-out groove is provided at the lower end of the upper end tube. The upper end of the arc-shaped plate is step-shaped and elastically limited in the slide-out groove, and a clamping groove is provided at the lower end of the adjacent upper end tube.

Preferably, the bottom of the arc-shaped plate is fixedly connected to a cylinder, the end of the cylinder is fixedly connected to a steel ball, a rubber layer is arranged on the outside of the steel ball, and the steel ball is spherically hinged to the bottom of the storage tank.

Preferably, a blade is provided at the bottom of the lower end pipe, and a grouting hole is provided at the lower end pipe.

Preferably, the upper side of the pile pipe is threadedly connected to an end cap, and the end cap is fixedly connected to a grouting pipe and a grouting discharge pipe.

Preferably, the upper end of the pile pipe is fixedly connected to a bracket, and the upper side of the bracket is fixedly connected to a mounting handle.

The advantages of the present invention are as follows: a foundation reinforcement device for a tunnel passing through a soft soil layer provided by the present invention drills a pile pipe into the soft soil in the tunnel crossing area. On the one hand, the pile pipe squeezes the soil to make it dense, and on the other hand, the soil at the soft soil position is consolidated through conventional grouting technology. It takes time for the hardener to harden the soil, and after hardening, the wear of the shield cutter head by the pile column is aggravated. A separation device of a corresponding height is set for the tunnel section, which is detached from the middle part of the pile pipe, so that the wear of the tool is reduced when the shield cutter head is cutting forward, thereby reinforcing the foundation without seriously affecting the construction period.

The present invention causes the casing to rise relative to the suspension rod, and the circular ring at the lower end of the casing rises, and the support rod pulls the sliding sleeve to slide along the cross rod toward the suspension rod, so that all the arc plates move inward, and at the same time the clamping block is disengaged from the clamping groove, and the arc plate with a reduced outer contour can be pulled outward from the upper end tube, so that obstacles on the route of the shield cutter head can be removed, and the wear of the cutter head is reduced.

The present invention enables the arc-shaped plates to move inwards, and the elastic steel bars elastically press against the slide-out grooves and gradually become arc-shaped. When all the arc-shaped plates are contracted, they can be lifted upwards and leave the upper end tubes. The elastic steel bars are pushed upwards by the storage grooves, and inserted into the oblique clamping grooves along the slide-out grooves, so that adjacent upper end tubes are connected together in sequence to form a grid, thereby reducing the risk of soil settlement above the tunnel.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the basic structure of the present invention;

FIG2 is a schematic diagram of a partial structure of a separation device in the present invention;

FIG3 is a schematic diagram of a state in which the overall outer diameter of the arc-shaped plate of the separation device of the present invention is reduced;

FIG4 is a partial enlarged view of point E in FIG3 ;

FIG5 is a schematic diagram of the position distribution of multiple pile pipes relative to the tunnel section of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

As shown in Figures 1 to 5, a foundation reinforcement device for a tunnel passing through a soft soil layer provided by the present invention includes a plurality of pile pipes 1, each of which is provided with a separation device 2 in the middle, and the heights of the separation devices 2 of the plurality of pile pipes 1 correspond to the avoidance settings of the tunnel section.

The pile pipe 1 comprises an upper end pipe 11 and a lower end pipe 12. A slot 13 is respectively arranged at the lower end of the inner cavity of the upper end pipe 11 and the upper end of the inner cavity of the lower end pipe 12. A blade 14 is arranged at the bottom of the lower end pipe 12. A grouting hole 15 is arranged at the lower end pipe 12. An end cap 16 is threadedly connected to the upper side of the pile pipe 1. The end cap 16 is fixedly connected to a grouting pipe 17 and a grouting pipe 18. Drawing on the construction technology of bored piles, a hardener is sprayed into the soil around the pile pipe 1 during the drilling process of the pile pipe 1 to play a reinforcing role. The upper end of the pile pipe 1 is fixedly connected to a bracket 19 by bolts to facilitate subsequent disassembly. The upper side of the bracket 19 is fixedly connected to a mounting handle 191.

The present invention uses the drilling method of the prior art to drill the pile pipe 1 into the soft soil in the tunnel crossing area. On the one hand, the pile pipe 1 squeezes the soil to make it dense, and on the other hand, the soil at the soft soil position is consolidated by the conventional grouting technology. It takes time for the hardener to harden the soil, and after hardening, the wear of the shield cutter head by the pile column is aggravated.

After the initial hardening by the hardener of the present invention (the strength of the soil after hardening can be obtained through laboratory simulation), as shown in Figure 5, a separation device 2 of a corresponding height is set for the tunnel section 10, which is detached from the middle of the pile pipe 1, so that the tool wear is reduced during the forward cutting of the shield cutter head, thereby strengthening the foundation without seriously affecting the construction period.

As a specific embodiment of the present invention, the separation device 2 includes a suspension rod 21, a threaded section is arranged at the upper end of the suspension rod 21, a sleeve 22 is arranged outside the suspension rod 21, the sleeve 22 is threadedly connected to the upper end of the suspension rod 21, a ring 23 is arranged at the lower end of the sleeve 22, a plurality of cross bars 24 are fixedly connected in an array at the lower end of the suspension rod 21, each cross bar 24 is slidably connected to a sliding sleeve 25, one end of the sliding sleeve 25 is fixedly connected to an arc plate 26, all the arc plates 26 can be spliced into a cylindrical structure of different sizes, the upper side of the sliding sleeve 25 is hingedly connected to a support rod 27, and the upper end of the support rod 27 is hingedly connected to the ring 23;

The upper end and the lower end of the inner arc surface of the arc-shaped plate 26 are fixedly connected to the vertical plate 28 respectively, and the vertical plate 28 is fixedly connected to the clamping block 29 . The clamping block 29 is arranged corresponding to the clamping slot 13 .

When the present embodiment is working, the pile pipe 1 is sunk into the soil as a whole. After the initial reinforcement strength of the soil meets the test requirements, the hydraulic device clamps the fixed suspension rod 21, and the hydraulic wrench clamps the rotating sleeve 22, so that the sleeve 22 rotates relative to the suspension rod 21. Under the action of the threaded structure, the sleeve 22 rises relative to the suspension rod 21, and the ring 23 at the lower end of the sleeve 22 rises. The sliding sleeve 25 is pulled by the support rod 27 to slide along the cross bar 24 toward the suspension rod 21, so that all the arc plates 26 move inwardly, and at the same time, the block 29 is disengaged from the slot 13, and the arc plate 26 with a reduced outer contour can be pulled out from the upper end pipe 11, so that obstacles on the route of the shield cutter head can be removed, so that the wear of the cutter head is reduced.

As a further embodiment of the present invention, notches 261 and protrusions 262 are alternately arranged on the sides of two adjacent arc-shaped plates 26, and a slurry outlet hole 263 is formed between the protrusion 262 and the notch 261; the intersection of the protrusion 262 and the notch 261 can provide good support for the axial direction of the pile pipe 1, so that the pile pipe 1 has strong integrity, which is convenient for drilling into the soil in the same construction method as conventional piles. After the pile pipe 1 enters the predetermined depth, all the arc-shaped plates 26 move toward the hanger 21, shrinking the outermost contour, so that all of them can be finally pulled out from the upper end pipe 11, thereby facilitating reuse, and leaving the upper end pipe 11 and the lower end pipe 12 separately in the soil to achieve permanent reinforcement.

As a further embodiment of the present invention, a storage groove 3 is set on the outer arc surface of one of the arc plates 26, and an arc-shaped elastic steel bar 4 is rotatably connected in the storage groove 3. A slide-out groove 41 is set at the lower end of the upper end tube 11. The upper end of the arc plate 26 is stepped and elastically limited in the slide-out groove 41, and a clamping groove 42 is set at the lower end of the adjacent upper end tube 11.

Specifically, the bottom of the arc plate 26 is fixedly connected to the cylinder 43, the end of the cylinder 43 is fixedly connected to the steel ball, a rubber layer 44 is arranged on the outside of the steel ball, the steel ball is spherically hinged to the bottom of the storage groove 3, and is elastically clamped into the spherical groove of the storage groove 3 through the rubber layer 44 and can be finally detached by pulling. During the pulling process, when the front end of the elastic steel bar 4 encounters gravel or hard blocks in the soft soil, it is convenient to change the forward direction of the elastic steel bar 4. When it cannot be aligned with the clamping groove 42 of the adjacent upper end tube 11, it can also prevent the upper end tube 11 from sinking and strengthen the connection strength between the upper end tube 11 and the soil by forming branches at the lower end of its own upper end tube 11.

When the present embodiment is working, since after the separation device 2 is removed, the upper end pipe 11 alone has the risk of sinking in the soil, the separation device 2 is assembled on the pile pipe 1 as a modular unit, the elastic steel bar 4 is pressed into the storage groove 3, and the upper end of the elastic steel bar 4 is located in the slide-out groove 41, and then inserted into the upper end pipe 11, and after the lower end pipe 12 is placed in the predetermined position, it is lowered relative to the suspension rod 21 through the sleeve 22, so that all the arc plates 26 move outward, and the upper end pipe 11 and the lower end pipe 12 are clamped at both ends of the separation device 2;

When separation is required, the arc plate 26 moves inward, the elastic steel bar 4 elastically presses against the slide-out groove 41 and gradually becomes an arc. When all the arc plates 26 are contracted, they can be lifted upward and leave the upper end tube 11. The elastic steel bar 4 is pushed upward by the storage groove 3 and inserted into the oblique clamping groove 42 along the slide-out groove 41, so that adjacent upper end tubes 11 are connected together in sequence to form a grid, reducing the risk of soil settlement above the tunnel, and the elastic steel bar 4 forms a channel between adjacent upper end tubes 11, which facilitates the secondary grouting slurry to flow along the periphery of the elastic steel bar 4, so that the two adjacent upper end tubes 11 are integrated after solidification.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a tunnel passes through foundation stabilization device in weak soil stratum, includes a plurality of stake pipes (1), its characterized in that: the middle part of each pile pipe (1) is provided with a separating device (2), and the heights of the separating devices (2) of the pile pipes (1) correspond to the tunnel section to avoid.

2. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 1, wherein: the pile pipe (1) comprises an upper end pipe (11) and a lower end pipe (12), and clamping grooves (13) are respectively formed in the lower end of an inner cavity of the upper end pipe (11) and the upper end of an inner cavity of the lower end pipe (12);

The separating device (2) comprises a hanging rod (21), a threaded section is arranged at the upper end of the hanging rod (21), a sleeve (22) is arranged outside the hanging rod (21), the sleeve (22) is in threaded connection with the upper end of the hanging rod (21), a circular ring (23) is arranged at the lower end of the sleeve (22), a plurality of cross rods (24) are fixedly connected at the lower end of the hanging rod (21) in an array mode, each cross rod (24) is slidably connected with a sliding sleeve (25), one end of each sliding sleeve (25) is fixedly connected with an arc-shaped plate (26), all the arc-shaped plates (26) can be spliced to form cylindrical structures with different sizes, a connecting strut (27) is hinged to the upper side of each sliding sleeve (25), and the upper ends of the struts (27) are hinged to the circular ring (23);

The upper end and the lower end of the inner cambered surface of the arc-shaped plate (26) are respectively and fixedly connected with a vertical plate (28), the vertical plate (28) is fixedly connected with a clamping block (29), and the clamping block (29) is correspondingly arranged with the clamping groove (13).

3. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 2, wherein: the side surfaces of two adjacent arc plates (26) are alternately provided with notches (261) and lugs (262), and slurry outlets (263) are formed between the lugs (262) and the notches (261).

4. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 2, wherein: one of the arc plates (26) is provided with a storage groove (3), the storage groove (3) is rotationally connected with an arc-shaped elastic steel bar (4), the lower end of an upper end pipe (11) is provided with a sliding-out groove (41), the upper end of the arc plate (26) is in a step shape and is elastically limited in the sliding-out groove (41), and the lower ends of adjacent upper end pipes (11) are provided with clamping grooves (42).

5. A device for reinforcing a foundation of a tunnel through a soft soil layer as set forth in claim 4, wherein: the bottom of the arc plate (26) is fixedly connected with a cylinder (43), the end of the cylinder (43) is fixedly connected with a steel ball, a rubber layer (44) is arranged on the outer side of the steel ball, and the steel ball is in spherical hinge joint with the bottom of the storage groove (3).

6. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 2, wherein: the bottom of the lower end pipe (12) is provided with a blade part (14), and the lower end pipe (12) is provided with a grouting hole (15).

7. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 1, wherein: the upper side of the pile pipe (1) is in threaded connection with an end cover (16), and the end cover (16) is fixedly connected with a grouting pipe (17) and a slurry discharging pipe (18).

8. A device for reinforcing a foundation of a tunnel through a soft soil layer as claimed in claim 1, wherein: the upper end of the pile pipe (1) is fixedly connected with a support (19), and the upper side of the support (19) is fixedly connected with a mounting handle (191).