CN208845184U - Bored tunnel preliminary bracing orients slip casting structure behind - Google Patents

Abstract

The utility model provides a kind of bored tunnel preliminary bracing behind orientation slip casting structure, it include: tunneling surface layer, grouting device, several preliminary bracing barriers and gunite concrete, the tunneling surface layer is located at below existing barrier, is reserved with undisturbed soil between the bottom of the existing barrier and the top of the tunneling surface layer；The grouting device includes multiple slip casting components, and the multiple slip casting component excavates direction along the tunneling surface layer and is fixed on the undisturbed soil bottom surface；Several preliminary bracing barriers excavate direction along the tunneling surface layer and are arranged in the tunneling surface layer；The gunite concrete injection is in the inner space of the tunneling surface layer and the support barrier, the injection point end of the Grouting Pipe is pierced by with the gap for injecting slurries, described in slip casting bag intumescent filler between preliminary bracing barrier and the undisturbed soil from the gunite concrete.Orientation slip casting may be implemented in the utility model, fills the gap generated by tunnel deformation.

Description

Bored tunnel preliminary bracing orients slip casting structure behind

Technical field

The utility model relates to shield tunnel construction technology fields, relate in particular to a kind of bored tunnel preliminary bracing back Slip casting structure is oriented afterwards.

Background technique

According to Tunnel Passing underground obstacle settlement monitoring situation, when sedimentation value and the rate of settling are close to early warning value, need Slip casting is compensated to Obstacle Position in time, existing slip casting process will lead to slurries and trickle everywhere, cannot concentrate well The position between tunnel and barrier, or even penetrate into the reserved deformation joint of Subway Tunnel, influence barrier structure and construction The stability of portion structure.

Utility model content

In view of the foregoing, the utility model provides a kind of bored tunnel preliminary bracing behind orientation slip casting structure, solves Existing Tunnel Passing underground obstacle, slurries trickle everywhere when compensating slip casting to Obstacle Position, cannot concentrate on tunnel Position between road and barrier, while slurry infiltration stitches the interior technology for influencing existing structure performance to Subway Tunnel prearrangement of deformation amount and asks Topic.

To achieve the above object, the technical scheme adopted by the utility model is that: a kind of bored tunnel preliminary bracing back is provided Slip casting structure, including tunneling surface layer are oriented afterwards, are located at below existing barrier, the bottom of the existing barrier and the tunneling Undisturbed soil is reserved between the top of surface layer, the bottom surface of the undisturbed soil and its following part form the tunneling surface layer；It is described Slip casting structure further include:

Grouting device, including multiple slip casting components, the multiple slip casting component excavate direction along the tunneling surface layer and fix In the undisturbed soil bottom surface, the slip casting component includes slip casting bag and Grouting Pipe, and the slip casting bag includes bag body and forms in institute The aperture being connected in bag body with the Grouting Pipe is stated, the Grouting Pipe forms injection point end far from one end of the aperture；

Several preliminary bracing barriers excavate direction along the tunneling surface layer and are arranged in the tunneling surface layer, the initial stage The top surface of supporting barrier supports the slip casting bag, and the Grouting Pipe is fixed with the preliminary bracing barrier；

Gunite concrete sprays the slurries in the inner space of the tunneling surface layer and the preliminary bracing barrier Arrival end is pierced by exposed from the gunite concrete, and slurries, the note are injected into the slip casting bag by the Grouting Pipe Starch the gap described in bag intumescent filler between preliminary bracing barrier and the undisturbed soil bottom surface.

In the utility model embodiment, the slip casting bag is that the double-deck splash guard sweat soldering is formed.

In the utility model embodiment, the welding position of the bilayer splash guard forms weld seam, the width of weld seam described in single Degree is not less than 15mm, and the width of the outer rim of splash guard described in the welding seam distance is not less than 50mm.

In the utility model embodiment, the surplus capacity that 2cm high is reserved between the middle part of the bilayer splash guard forms slurry Liquid Injection Space.

In the utility model embodiment, the Grouting Pipe is plastic screwed pipe.

In the utility model embodiment, the angle between the Grouting Pipe screwed pipe and the slip casting bag is 0~180 °.

In the utility model embodiment, the lower surface of the slip casting bag is equipped with geotextiles protective layer.

The utility model due to use above technical scheme, make it have it is following the utility model has the advantages that

(1) the utility model slip casting bag uses bilayer EVA splash guard sweat soldering, Grouting Pipe is drawn in the middle part of bag body, by institute Slip casting bag is stated set on there may be the position of deformation joint, i.e. subregion slip casting injects slurries into Grouting Pipe and realizes orientation dynamic benefit Slip casting is repaid, the gap that filling in time is generated by tunnel deformation (sedimentation or convergence).

(2) subregion slip casting can be used in combination with preliminary bracing backfill slip casting behind, because slurries will not be seeped from front of tunnel heading Out, therefore face and behind backfill slip casting distance can be shortened, realizes the timeliness for backfilling slip casting behind.

(3) setting of the utility model slip casting component can stitch simultaneously to avoid existing barrier prearrangement of deformation amount and other are weak The infiltration of slurries in node.

Detailed description of the invention

Fig. 1 is the positional diagram of the utility model slip casting component and concealed tunneling structure.

Fig. 2 is the schematic cross-sectional view of 2-2 hatching line in the utility model Fig. 1.

Fig. 3 is the partial enlargement diagram in the utility model Fig. 1 at S1.

Fig. 4 is the partial enlargement diagram in the utility model Fig. 2 at S2.

Fig. 5 is the structural schematic diagram of the utility model slip casting component.

Fig. 6 is the schematic cross-sectional view of 1-1 hatching line in the utility model Fig. 5.

The corresponding relationship of appended drawing reference and component is as follows:

Tunneling surface layer 1；Slip casting component 2；Slip casting bag 21；Grouting Pipe 22；Injection point end 221；Preliminary bracing barrier 3；Both There is barrier 4；Undisturbed soil 5；Subway Tunnel 6；Deformation joint 7；Top bar 8.

Specific embodiment

For the benefit of to the understanding of the utility model, it is illustrated with reference to the accompanying drawings and embodiments.

It please referring to shown in Fig. 1, Fig. 2, the utility model provides a kind of bored tunnel preliminary bracing behind orientation slip casting structure, Including tunneling surface layer 1, grouting device, several preliminary bracing barriers 3 and gunite concrete (not shown).Wherein:

The tunneling surface layer 1 is located at existing 4 lower section of barrier, the bottom of the existing barrier 4 and the tunneling surface layer 1 Top between be reserved with undisturbed soil 5, the bottom surface and its following part of the undisturbed soil 5 form the tunneling surface layer 1；This is practical In new embodiment, the existing barrier 4 can for structure of the subway or other include the construction in tunnel, the tunneling surface layer 1 In 6 lower section of Subway Tunnel of the structure of the subway, when existing barrier 4 is other constructions, the tunneling surface layer 1 is located at tunnel The lower section of position.

As shown in figure 4, the grouting device includes multiple slip casting components 2, the multiple slip casting component 2 is along the tunneling Surface layer 1 excavate direction be fixed on 5 bottom surface of undisturbed soil, as shown in Figure 5, Figure 6, the slip casting component 2 include slip casting bag 21 and Grouting Pipe 22, the slip casting bag 21 includes bag body and forms in the aperture being connected in the bag body with the Grouting Pipe 22, described Grouting Pipe 22 forms injection point end 221 far from one end of the aperture, and slurries are from the injection point end 221 along Grouting Pipe 22 extending direction enters the slip casting bag 21.

In the utility model embodiment, the slip casting bag 21 uses bilayer EVA (ethylene-vinyl acetate copolymer) splash guard Welding, according to the spacing and width of preliminary bracing grid 3, by splash guard double-layer overlapping, in the middle part of the bilayer splash guard between The surplus capacity of reserved 2cm high forms slurries Injection Space, and the surrounding outer rim of the double-deck splash guard is welded, prevents slurries from four All outer rim outflows will weld Grouting Pipe 22 towards the bag body of Tunnel barrier side, for the later period into slip casting bag 21 Carry out slip casting filling；The utility model weld seam is climbed using pair weld seams, welding using with temperature adjustment, the automatic of speed regulation thermal wedge formula function Line heat-sealing machine sweat soldering, effective weld width of single weld seam are not less than 15mm, splash guard described in the welding seam distance The width of outer rim is not less than 50mm, and more preferably, the Grouting Pipe 22 is set to the medium position of the slip casting bag 21；The slip casting bag 21 lower surface surface is equipped with geotextiles protective layer (not shown), prevents mechanical damage and electric spark from burning splash guard.

The Grouting Pipe 22 uses plastic screwed pipe, can carry out repeating slip casting, the plastic screwed pipe is hose and has Enough compression strength is to resist ambient pressure without being crushed；The Grouting Pipe 22 passes through grouting nozzle and the slip casting bag 21 Sweat soldering, the slip casting component 2 needs to be inflated detection, the blowing pressure 0.15MPa after welding, and maintains the pressure not Less than 15min, otherwise welding equipment should be detected, and adjust welding procedure, can carry out adding in batches after reaching requirement Work.

The gunite concrete injection is in the inner space of the tunneling surface layer 1 and the preliminary bracing barrier 3.Pass through The Grouting Pipe 22 injects slurries into the slip casting bag 21, preliminary bracing barrier 3 described in 21 intumescent filler of slip casting bag with Gap between 5 bottom surface of undisturbed soil；More preferably, in Xiang Suoshu slip casting bag 21 grouting pressure of injection slurries be 0.3~ 0.5MPa；Angle between the Grouting Pipe 22 and the slip casting bag 21 is 0~180 °, and the Grouting Pipe 22 can be arbitrarily bent Its angle with slip casting bag 21 is adjusted in order to enable injection point end 221 wear from the gunite concrete according to its position It is exposed out；As shown in Figure 1, the setting of the slip casting bag 21 can prevent slurries from flowing into the deformation joint 7 between Subway Tunnel 6.

As shown in Figure 3, Figure 4, several preliminary bracing barriers 3 are arranged in described along the tunneling surface layer 1 excavation direction In tunneling surface layer 1, the top surface of the preliminary bracing barrier 3 supports the slip casting bag 21, the Grouting Pipe 22 and the initial stage branch It is fixed to protect barrier 3；As shown in Figure 1, the preliminary bracing barrier 3 is in matrix pattern in the utility model embodiment.

The details described above structure of the utility model, illustrates its construction method below.

(1) the prominent sharp parts in 5 bottom surface of undisturbed soil are cut, keeps 5 bottom surface of undisturbed soil smooth smoother.

(2) after the completion of Tunnel top bar 8 is excavated, direction is excavated along tunneling surface layer 1 and is laid with slip casting component 2, It is laid with using a side to the other side, is gradually expanded, it is elastic to answer appropriateness, guarantee that the entire area of slip casting component 2 can arrive to 5 bottom surface of undisturbed soil keeps nature, smooth, submissive, prevents hollowing phenomenon, cover after the completion of laying in slip casting component lower surface Lid geotextiles protective layer；In the utility model embodiment, both wired bottoms are fixed on using the nailing with circular washer or expansion bolt Portion, fixed point spacing are 0.5~0.8m, are welded with hot air welding gun, melt 21 splash guard of slip casting bag and cohere jail with plastic washer Gu.

(3) direction is excavated along the tunneling surface layer 1 and be laid with preliminary bracing barrier 3, by Grouting Pipe 22 and the preliminary bracing Barrier 3 is fixed and keeps the injection point end 221 of Grouting Pipe 22 to expose in order to inject slurries by injection point end 221.

(4) gunite concrete in the inner space of Xiang Suoshu tunneling surface layer 1 and the support barrier, to preliminary bracing coagulation After soil reaches design strength, slip casting is carried out by the injection point end 221 of Grouting Pipe 22, grouting pressure is 0.3~0.5MPa, when When pressure steeply rises, stop slip casting, the later period can carry out corresponding site according to sedimentation and deformation situation repeating slip casting.

Combine accompanying drawings and embodiments that the utility model is described in detail above, those skilled in the art can Many variations example is made to the utility model according to the above description.Thus, certain details in embodiment should not be constituted to this reality With novel restriction, the utility model will be using the range that the appended claims define as the protection scope of the utility model.

Claims (7)

1. a kind of bored tunnel preliminary bracing orients slip casting structure behind, including tunneling surface layer is located at below existing barrier, institute State and be reserved with undisturbed soil between the bottom of existing barrier and the top of the tunneling surface layer, the bottom surface of the undisturbed soil and its with Lower part forms the tunneling surface layer；It is characterized in that, the slip casting structure further include:

Grouting device, including multiple slip casting components, the multiple slip casting component excavate direction along the tunneling surface layer and are fixed on institute State undisturbed soil bottom surface, the slip casting component includes slip casting bag and Grouting Pipe, and the slip casting bag includes bag body and forms in the bag The aperture being connected on body with the Grouting Pipe, the Grouting Pipe form injection point end far from one end of the aperture；

Several preliminary bracing barriers excavate direction along the tunneling surface layer and are arranged in the tunneling surface layer, the preliminary bracing The top surface of barrier supports the slip casting bag, and the Grouting Pipe is fixed with the preliminary bracing barrier；

Gunite concrete sprays the injection point in the inner space of the tunneling surface layer and the preliminary bracing barrier End is pierced by exposed from the gunite concrete, and slurries, the slip casting bag are injected into the slip casting bag by the Grouting Pipe Gap between preliminary bracing barrier described in intumescent filler and the undisturbed soil bottom surface.

2. bored tunnel preliminary bracing according to claim 1 orients slip casting structure behind, which is characterized in that the slip casting Bag is formed for the double-deck splash guard sweat soldering.

3. bored tunnel preliminary bracing according to claim 2 orients slip casting structure behind, which is characterized in that the bilayer The welding position of splash guard forms weld seam, and the width of weld seam described in single is not less than 15mm, splash guard described in the welding seam distance Outer rim width be not less than 50mm.

4. bored tunnel preliminary bracing according to claim 2 orients slip casting structure behind, which is characterized in that the bilayer The surplus capacity that 2cm high is reserved between the middle part of splash guard forms slurries Injection Space.

5. bored tunnel preliminary bracing according to claim 1 orients slip casting structure behind, which is characterized in that the slip casting Pipe is plastic screwed pipe.

6. bored tunnel preliminary bracing orients slip casting structure behind according to claim 1 or 5, which is characterized in that described Angle between Grouting Pipe and the slip casting bag is 0~180 °.

7. bored tunnel preliminary bracing according to claim 1 orients slip casting structure behind, which is characterized in that the slip casting The lower surface of bag is equipped with geotextiles protective layer.