CN220184025U

CN220184025U - Grouting structure

Info

Publication number: CN220184025U
Application number: CN202320110051.4U
Authority: CN
Inventors: 张晓丽; 罗章波; 杨旭; 贺业永; 江戈; 朴松
Original assignee: China Railway Fifth Survey and Design Institute Group Co Ltd
Current assignee: China Railway Fifth Survey and Design Institute Group Co Ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-12-15
Anticipated expiration: 2033-01-17

Abstract

The embodiment of the utility model provides a grouting structure, which comprises at least one grouting area of a sheet area, wherein each grouting area comprises a grouting pipe used for grouting into the grouting area of the grouting structure; the water stop strips are positioned on two radial horizontal sides of the grouting pipe and isolate grouting space for the grouting pipe. The construction of stable control of the tunnel crossing stratum reinforcement grout in the water soft soil area is aimed at in this scheme, and through the structure of regional grout, the construction method has the advantages of low cost, controllable construction running water, clear partition, high efficiency, and can rapidly realize the solidification control stable effect of the soft soil stratum.

Description

Grouting structure

Technical Field

The utility model relates to the technical field of underground engineering synthesis, in particular to a grouting structure.

Background

Grouting is a method of filling certain solidified materials such as cement, lime or other chemical materials into the ground and rock soil in a certain range under a foundation to fill cracks and pores in the rock soil, prevent the ground from leaking, improve the integrity, strength and rigidity of the rock soil, and how to control the stability of grouting can directly relate to the grouting construction completion effect.

At present, the stratum grouting stability is controlled basically by the design of a supporting structure of geotechnical water retaining and soil retaining and grouting reinforcement, so as to achieve the aims of consolidation, lifting, reinforcement and the like of the stratum. The problems of high cost, poor effect, incapability of unifying standard or standardized operation, loss of grouting amount, difficult effective grouting, difficult guarantee of strength and leveling effect and the like exist.

The existing stratum grouting solidification technology only comprises a vertical hole grouting method, and has the engineering problems of incapability of uniform grouting reinforcement effect in the same layer and the same elevation, poor grouting hole reinforcement effect, uncontrollable work efficiency, discrete grouting point arrangement, weak bearing capacity, uneven softness, no block flow method, low construction speed and the like.

Disclosure of Invention

To solve one of the above-mentioned technical drawbacks, an embodiment of the present utility model provides a grouting structure including at least one grouting area of a sheet area, each grouting area including,

the grouting pipe is used for grouting into a grouting area of the grouting structure;

the water stop strips are positioned on two radial horizontal sides of the grouting pipe and isolate grouting space for the grouting pipe.

The grouting structure provided by the embodiment of the utility model is used for the construction of grouting stability control of the tunnel crossing stratum in the soft water soil area, and has the advantages of low cost, controllable construction running water, clear partition, high efficiency and capability of rapidly realizing the solidification stability control of the soft water soil stratum through the structure of partition grouting.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a single-layer schematic diagram of a grouting structure according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a grouting structure according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a grouting pipe according to an embodiment of the present utility model.

Fig. 4 is a partial enlarged view of a main grouting pipe according to an embodiment of the present utility model.

Fig. 5 is a schematic structural diagram of a grouting hose according to an embodiment of the present utility model.

Fig. 6 is a schematic cross-sectional view of a grouting hose according to an embodiment of the present utility model.

In the figure:

1. a main grouting pipe; 11. a pulp discharging hole; 12. a grommet; 2. grouting hose; 21. a tube wall; 22. a die; 221. grouting channels; 222. a pulp outlet hole; 23. a reinforcing layer; 24. a sealing strip; 3. a water stop; 4. t-shaped plug.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present utility model more apparent, the following detailed description of exemplary embodiments of the present utility model is provided in conjunction with the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model and not exhaustive of all embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the process of realizing the utility model, the inventor finds that the existing stratum grouting solidification technology has only a vertical hole grouting mode, and has the engineering problems of poor grouting hole grouting reinforcement effect, uncontrollable work efficiency, discrete grouting point arrangement, weak bearing capacity, uneven softness, a block-free running water method, low construction speed and the like, and the grouting reinforcement effect of the same layer and the same elevation grouting reinforcement effect cannot be uniform.

Example 1

Referring to fig. 1 and 2, in order to solve the above-mentioned problems, an embodiment of the present utility model provides a grouting structure, where a construction site is divided into a plurality of grouting blocks according to a construction requirement, and grouting is performed by the grouting blocks in a partition manner. Each grouting area is composed of a plurality of grouting areas which are arranged in a rectangular array. The grouting areas of the same grouting area form linear array distribution along the horizontal and vertical directions.

The area of the grouting area is 2 multiplied by 2m ² —3×3m ² And a lap joint width larger than or equal to 30cm is arranged between two adjacent grouting blocks, and the lap joint width is enough to ensure the grouting effect between the joints, namely the horizontal interval between the two grouting blocks.

Each grouting area comprises a grouting pipe used for grouting into the grouting area of the grouting structure and water stops 3 which are positioned on two radial horizontal sides of the grouting pipe and isolate grouting space for the grouting pipe. The water stop belt 3 is a back-attached water stop strip. The back-attached water stop strip adopts the prior art, and aims to prevent the free diffusion of slurry; the back-attached type water stop strip (belt) has one flat surface and one stiffening rib (belt) surface, and the flat surface is generally attached to one side needing to prevent slurry from diffusing.

The distance between the two water stops 3 of each grouting area is 10 cm to 30cm; the thickness of each water stop strip 3 is 2-3cm; the pipe diameter of the main grouting pipe 1 in the grouting pipe is 8-12mm;

the lateral and longitudinal spacing of adjacent grouting areas is less than 6m. The longitudinal protection length of each back-attached water stop is more than 5m.

The construction steps of the scheme are as follows:

(1) Performing preparation work before grouting, such as basal plane leveling, sundry cleaning, leveling site and the like;

(2) Determining a solidification area refinement partition by using a water stop belt 3, and reinforcing an elevation range; the water stop belt 3 can be a water stop belt or a water stop adhesive tape attached on the back of the upstream surface.

(3) The mixing proportion of grouting additives (water reducing agent, curing agent and the like) is defined in the subareas; grouting amount;

(4) Partition-sticking back-sticking type re-sticking water stop belt and back-sticking type water stopA grouting pipe is arranged in the middle of the water belt, and the grouting area is equal to (2 multiplied by 2) m ² To (3X 3) m ² Dividing parallel running water, and improving grouting range and circulation efficiency according to the comparison of compression strength and water outlet effect; in order to increase the flatness and reduce the construction joint leakage, the overlapping width of more than 30cm is arranged between grouting blocks;

(5) After the pre-compaction, leveling and maintenance of the solidification area are finished, grouting is finished, after the slurry is solidified, a water pressing test and a core drilling are carried out, the water permeability and the compressive strength of the soil body are checked, and the supplementary grouting is analyzed and judged or the shield pushing stage is carried out.

The integral effect of the solidification strength of the bearing stratum after grouting reinforcement is 0.5-5MPa, and the requirement of bleeding and compactness is met. The grouting and maintenance time is more than 7d under the condition of partially softening water; the layers are laminated, rolled, leveled and the like after auxiliary reinforcement, and grouting is applied to the tunnel crossing stratum in the soft water soil area to strengthen, control and stabilize, so that the strength, compactness, bearing capacity and the like of the soft soil layer meet the design construction requirements.

The layering partition water stop grouting mode of this scheme is convenient for follow actual stratum and fluctuate quick nimble layering subregion, realize slip casting quantization and full space district, quantization including area, volume, slip casting volume etc. low-priced, quick, the more accurate location of leakage point, convenient reinforcement realizes construction running water to can repeated slip casting, the reinforcement after the realization running thick liquid that can be fine improves the solidification effect, especially can the bearing capacity in a large range of water stratum, reduce the construction repetition process and the expense of layering ramming, effectively enlarge construction operation space, the pertinence is strong, the advantage of rapidly improving stratum solidification intensity.

The scheme effectively improves the layered partition of the partition water stop grouting under the condition of lower cost, has flexible arrangement characteristics, rapidly improves the overall grouting work efficiency, and meets the field requirements of the layered partition water stop grouting.

Example 2

Referring to fig. 3 and 4, on the basis of embodiment 1, each grouting area includes a plurality of grouting pipes, and the ends of two adjacent grouting pipes are staggered.

The grouting pipe specifically comprises a main grouting pipe 1, a grouting hose 2 is arranged on the main grouting pipe 1, and the grouting hose 2 is communicated with the inside of the main grouting pipe 1; a plurality of slurry discharging holes 11 are formed in the pipe body of the main grouting pipe 1, and hole protecting pieces 12 for protecting the slurry discharging holes 11 are arranged outside the slurry discharging holes 11.

The hole protecting piece 12 is obliquely arranged outside the pulp discharging hole 11; the projection area of the hole protection piece 12 facing the axial section of the main grouting pipe 1 is a, and the projection area of the slurry discharging hole 11 facing the axial section of the main grouting pipe 1 is b, so that a is larger than or equal to b. The included angle between the extension line of the axis of the hole protection piece 12 and the axis of the main grouting pipe 1 is larger than or equal to 30 degrees, if the included angle is smaller than 30 degrees, the grouting speed is reduced, and the grouting reinforcement effect is obviously reduced; less than 25 deg. affects normal use. The purpose of the inclined arrangement of the hole protection member 12 is to protect the penetration of the grouting holes, and the installation influence on the grouting pipe is small. The hole guard 12 may cut the reinforcing bars and then weld the reinforcing bars outside the grout discharging holes 11 of the main grouting pipe 1.

The slurry discharging hole 11 penetrates through the pipe body of the main grouting pipe 1 along the radial direction of the main grouting pipe 1; the slurry discharge holes 11 are sequentially arranged along the axial direction of the main grouting pipe 1, and the slurry discharge holes are uniformly formed at intervals.

The two groups of slurry discharging holes are arranged, and the axes of the slurry discharging holes 11 in the two groups of slurry discharging holes are respectively intersected with and perpendicular to the axis of the main grouting pipe 1; each of the pulp discharge holes 11 in the group of pulp discharge holes is arranged at intervals along the axial direction of the main grouting pipe 1; the pulp discharge holes 11 in the other set of pulp discharge holes are arranged at intervals in the circumferential direction of the main grouting pipe 1.

Further, the center lines of the grout discharging holes 11 in the two grout discharging hole groups are vertical and are alternately arranged along the center line direction of the main grouting pipe 1

Two ends of each main grouting pipe 1 are respectively provided with a grouting hose 2, and the end parts of the main grouting pipes 1 are plugged by T-shaped plugs 4. The adjacent main grouting pipes 1 can be in flexible or rigid lap joint, and the method is matched with a layered and partitioned grouting method, so that the method has the technical advantages of flexibility, safety, good effect and the like.

Example 3

Referring to fig. 5 and 6, the portion of the outer wall of the tube is omitted in fig. 6, and the grouting hose 2 includes a tube wall 21 and a tube core 22 on the basis of the above-described embodiment; the tube core 22 is arranged inside the tube wall 21, and the tube core 22 forms a supporting force on the tube wall 21 in the radial direction inside the tube wall 21; the inner part of the tube core 22 is provided with a grouting channel 221, and the grouting channel 221 forms a grouting space inside the tube core 22; a reinforcing layer 23 is provided between the die 22 and the tube wall 21. The reinforcing layer 23 is a mesh layer that is wrapped around the die 22.

The tube core 22 is a skeleton structure arranged in the tube wall 21, a plurality of slurry outlet holes 222 are formed in the periphery of the tube core 22, and the slurry outlet holes 222 are communicated with the slurry injection channel 221 in the outer space and the inner space of the tube core 22.

The outer wall of the tube core 22 is provided with a plurality of grooves which are long grooves arranged along the axial direction of the tube core 22; the slurry outlet 222 is arranged on the wall of the groove; between two adjacent grooves, a convex structure of the tube core 22 is formed, which convex structure forms a supporting force of the tube core 22 with respect to the tube wall 21.

A sealing strip 24 is arranged between the tube core 22 and the reinforcing layer 23, the sealing strip 24 is arranged corresponding to the groove of the tube core 22, and the sealing strip 24 is buried in the groove.

The sealing strip 24 is a strip made of water-swellable material; the circumferential array of grooves of die 22 is open to at least four. The water-swellable sealing strip 24 is used for protecting the grout outlet, fine particles in concrete can be prevented from entering the pipe body when the grouting pipe is pre-buried in the construction joint, and the sealing strip 24 can be opened under the action of certain internal pressure when the grouting pipe is used for grouting, so that liquid uniformly grouting flows out to solidify the stratum.

The grouting hose 2 is of a hollow design, so that better rigidity and shear strength can be obtained, and the holes in the tube core 22 are used as drilling high-pressure air water channels and grouting channels. The outer surface of the grouting hose is provided with a standard large-pitch thread structure or a socket, so that cutting and lengthening are facilitated, namely, the outer layer of the position of the reinforcing layer 23 is used for reinforcing the woven mesh, and compared with a smooth rod body, the bonding area is increased, and therefore the anchoring force is improved.

Grouting preliminary analysis is carried out, and grouting parameters such as L, n, h and the like are preliminarily planned according to engineering geology and hydrogeology conditions of the controlled and stabilized stratum and in combination with field grading, so that the grouting quantity and the stratum bearing capacity after grouting are checked and calculated to meet the requirements.

And (3) obtaining n, L and h matched with the safety requirement through a circulation test, and determining the basic design parameters of the grouting completion.

L, the longitudinal protection length of each back-attached water stop belt is more than 5m;

n-the number of main grouting pipes (single side);

h, grouting to control the thickness of the stabilizing layer;

d (t) -D grouting pipe diameter, t representing grouting pipe wall thickness;

and (5) repeating grouting to strengthen according to the curing effect.

When the number of the main grouting pipes (single side) refers to the number of the pipes on each side of the grouting area, the main grouting pipes are arranged on two sides of the grouting area, the single side refers to one side, and the single side of n is the number of the pipes on each side of the grouting area. The grouting stability control layer thickness refers to the soil layer thickness which can reach the design strength and stability requirement after grouting.

When the scheme is implemented, the following process is referred to:

(1) Partition parameter determination and grouting design

According to the weak and unsaturated conditions of the field stratum, the rapid zonal and layered combination of the water stop bars is convenient, and grouting design is carried out.

According to the geological and hydrogeological conditions of stratum stability control engineering, the length L of a longitudinal water bar designed by water stop grouting of each partition, the number n (single side) of main grouting pipes matched with the water stop grouting section of each linear meter partition, the grouting stability control layer thickness h and other grouting parameters are given out by combining the existing stratum conditions; and the diameter D of the main grouting pipe 1 and the wall thickness t parameter of the steel flowtube are equivalent to the sum of cube units through rigidity equivalence, and the comparison calculation of finite element models is carried out to obtain the comparison of strength parameters of the reinforced stratum before and after grouting and the grouting design.

(2) Calculating grouting amount

And (5) according to the grouting grade at the selected calculation section, controlling the stable burial depth of the stratum, and calculating the grouting quantity.

(3) Bearing capacity calculation after curing grouting

1) Grouting stage

Further optimizing and determining the diameter d and the spacing c of the grouting pipes.

2) Post-grouting reinforcement stage

And calculating and determining parameters such as bearing capacity, conversion strength and the like of the stratum after solidification.

So far, all parameters required by the regional water stop grouting construction synthesis are clear, and the design flow is finished.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A grouting structure is characterized by comprising grouting areas of at least one sheet area, each grouting area comprising,

the water stop strips (3) are positioned on two radial horizontal sides of the grouting pipe and isolate grouting space for the grouting pipe.

2. The grouting structure of claim 1, comprising a plurality of grouting blocks, each grouting block being formed by a plurality of grouting areas arranged in a rectangular array;

when a plurality of grouting areas of the same grouting block are distributed, linear array distribution in horizontal and vertical directions is included;

the area of the grouting block is (2 multiplied by 2) m ² To (3X 3) m ² And a lap joint width larger than or equal to 30cm is arranged between two adjacent grouting blocks.

3. The grouting structure of claim 1, wherein each grouting area comprises a plurality of grouting pipes, and the ends of two adjacent grouting pipes are staggered.

4. Grouting structure according to claim 1, characterized in that the water stop (3) of the grouting area is a back-mounted water stop.

5. Grouting structure according to any one of claims 1-4, characterized in that the grouting pipe comprises a main grouting pipe (1), a grouting hose (2) is arranged on the main grouting pipe (1), and the grouting hose (2) is communicated with the inside of the main grouting pipe (1);

a plurality of slurry discharging holes (11) are formed in the pipe body of the main grouting pipe (1), and hole protection pieces (12) are arranged outside the slurry discharging holes (11).

6. Grouting structure according to claim 1, characterised in that the distance between the two water stops (3) of each grouting area is 10-30cm;

the thickness of each water stop belt (3) is 2-3cm;

the pipe diameter of the main grouting pipe (1) in the grouting pipe is 8-12mm;

the spacing between adjacent grouting areas is less than 6m.

7. The grouting structure as claimed in claim 5, wherein the hole protecting member (12) is provided obliquely outside the grout discharging hole (11);

the projection area of the hole protection piece (12) facing the axial section of the main grouting pipe (1) is a, and the projection area of the slurry discharging hole (11) facing the axial section of the main grouting pipe (1) is b, so that a is more than or equal to b.

8. Grouting structure according to claim 7, characterised in that the angle between the extension of the axis of the hole protection element (12) and the axis of the main grouting pipe (1) is greater than or equal to 30 °.

9. Grouting structure according to claim 5, characterized in that the grout outlet (11) penetrates the pipe body of the main grouting pipe (1) in the radial direction of the main grouting pipe (1);

the slurry discharging holes (11) are sequentially arranged along the axial direction of the main grouting pipe (1) and uniformly spaced to form slurry discharging hole groups.

10. Grouting structure according to claim 9, characterized in that the set of grout holes is provided with two sets, the axis of grout holes (11) being perpendicular to the axis of main grouting pipe (1);

each slurry discharging hole (11) in the slurry discharging hole group is arranged at intervals along the axial direction of the main grouting pipe (1);

the pulp discharge holes (11) in the other group of pulp discharge holes are arranged at intervals along the circumferential direction of the main grouting pipe (1).

11. Grouting structure according to claim 5, characterized in that the grouting hose (2) comprises a pipe wall (21) and a pipe core (22);

the tube core (22) is arranged inside the tube wall (21), and the tube core (22) forms radial supporting force on the tube wall (21) inside the tube wall (21);

a grouting channel (221) is formed in the die (22), and the grouting channel (221) forms a grouting space in the die (22);

a reinforcing layer (23) is arranged between the tube core (22) and the tube wall (21).

12. Grouting structure according to claim 11, characterised in that the reinforcing layer (23) is a mesh layer surrounding the core (22).

13. The grouting structure according to claim 11, wherein the core (22) is a skeleton structure arranged in the pipe wall (21), a plurality of grout outlet holes (222) are formed in the periphery of the core (22), and the grout outlet holes (222) are communicated with the grouting channels (221) in the outer space and the inner space of the core (22).

14. The grouting structure of claim 13, wherein the outer wall of the core (22) is provided with a plurality of grooves, the grooves being elongated grooves provided along the axial direction of the core (22);

the slurry outlet hole (222) is arranged on the wall of the groove;

a convex structure of the tube core (22) is formed between two adjacent grooves, and the convex structure forms supporting force of the tube core (22) relative to the tube wall (21).

15. Grouting structure according to claim 14, characterized in that a sealing strip (24) is arranged between the tube core (22) and the reinforcing layer (23), the sealing strip (24) is arranged corresponding to the groove of the tube core (22), and the sealing strip (24) is buried in the groove.

16. Grouting structure according to claim 15, characterized in that the sealing strip (24) is a strip of water-swellable material;

at least four grooves are formed in the circumferential array of the tube core (22).