CN217681767U - Self-sealing segment structure and segment sealing ring - Google Patents

Abstract

The utility model relates to a self sealss section of jurisdiction structure, section of jurisdiction closed ring. Self sealss section of jurisdiction structure includes: the duct piece body is of an arc-shaped structure, is provided with an outer arc surface and an inner arc surface in the radial direction, and is provided with a first side and a second side in the axial direction; the pulp bag is arranged on the outer arc surface and is deviated to the first side or the second side, the length and the direction of the pulp bag are consistent with those of the outer arc surface, and the two sides are fixed on the outer arc surface in a sealing way; the grouting pipe is embedded in the duct piece body, one end of the grouting pipe extends out of the inner arc surface, and the other end of the grouting pipe extends out of the outer arc surface and is opposite to the grout bag; the first slurry bag protection part is arranged on the outer arc surface and completely covers the slurry bag from the outer side, and can be separated from the duct piece body due to extrusion of the slurry bag in the slurry bag grouting expansion process. The utility model provides a section of jurisdiction structure can form the section of jurisdiction closed loop by the end-to-end concatenation and play the effect of stabilizing section of jurisdiction on every side to and can form the unit area and seal up the interval, run when avoiding being in milk and thick liquid phenomenon of scurrying, improve and backfill the body quality.

Description

Self-sealing segment structure and segment sealing ring

Technical Field

The utility model relates to a tunnel construction technical field especially relates to section of jurisdiction in the construction, concretely relates to self sealss section of jurisdiction structure, section of jurisdiction closed ring.

Background

With the improvement of the mechanization level of tunnel construction in China, more and more tunnel boring machines are applied to the first line of tunnel boring. With the increase of the development scale of tunnels in China, the tunnel construction faces deepening, and with the increase of the length and the burial depth of the tunnels, the geological hydrological conditions are more complex and difficult to monitor. Under the background, compared with the traditional construction process, the TBM tunnel boring machine has a series of advantages of high boring efficiency, good economic benefit, good lining integrity, high working safety and the like, and is increasingly widely applied.

The working principle of the TBM is that the front shield cuts a rock body through the rotation of the cutter head at the most front end under the action of a propulsion oil cylinder to crack and fall the rock body, and the TBM mainly comprises an open TBM, a single shield TBM and a double shield TBM. The double-shield TBM is applied more, and the working process of the double-shield TBM mainly comprises three stages of tunneling, duct piece supporting and pea gravel backfilling grouting. The overall effect of the pea gravel grouting layer formed by the pea gravel backfilling grouting and the duct piece determines the overall safety and waterproofness of the supporting structure, and is a decisive factor influencing the final quality of the tunnel.

For TBM backfill grouting, the pea gravel backfill grouting in practical engineering application mainly has the following problems:

(1) The pea gravel has a large amount of stone powder, the hydraulic filling pressure is high, the mutual collision among the pea gravel and the collision between the pea gravel and the rock wall also cause the generation of the stone powder, and in addition, the driving of high-pressure and high-speed air can cause a large amount of stone powder and dust to enter a tunnel, thereby influencing the visual field, harming the health of workers and influencing the timely discovery and investigation of potential safety hazards. Although the above-mentioned problem can be improved to the back shift of pea gravel hydraulic fill section of jurisdiction position, but also brought new problem when the back shift, most importantly be exactly that the back shift of pea gravel hydraulic fill position leads to the section of jurisdiction deviate from behind the shield tail although there is the cushion (mainly wooden, some engineering uses prefabricated bottom to have bellied bottom ring section of jurisdiction) to arrange in the section of jurisdiction below and play the supporting role, but major diameter's reinforced concrete section of jurisdiction dead weight is great, wooden cushion compressive strength is less, the deformation volume is big, the section of jurisdiction lacks vertical braces, be in unsettled state almost, lead to the section of jurisdiction to produce vertical displacement easily, take place the wrong platform, the damage, the seepage scheduling problem.

(2) The gravel-bean refilling and grouting part is in an unsealed open area, no seal is arranged between a grouting area and a hydraulic filling area, the area is unsealed, so that slurry filled in the grouting area flows to the hydraulic filling area, the grouting area is difficult to keep reasonable slurry pressure according to construction design, the slurry is in a low-pressure or even non-pressure environment for a long time in the filling area, the slurry can only permeate in the gaps of the gravel-bean depending on the self-fluidity of the slurry, the filling and filling effect is poor, filling missing is easy to cause, and the finally formed gravel-bean refilling and grouting slurry has the serious defects of pure cement slurry, partial cavities, non-compact filling of the grout, pure gravel and the like.

Therefore, it is necessary to provide a new segment structure, and the sealing rings spliced by the new segment structure can perform a good sealing function for the unit area, so as to avoid the above problems.

Disclosure of Invention

In view of the deficiencies of the prior art, the main object of the present invention is to provide a self-sealing segment structure, segment seal ring to solve one or more problems in the prior art.

The technical scheme of the utility model as follows:

the utility model discloses the first aspect provides a self sealss section of jurisdiction structure, include: the duct piece body is of an arc-shaped structure, is provided with an outer arc surface and an inner arc surface in the radial direction, and is provided with a first side and a second side in the axial direction; the pulp bag is arranged on the outer arc surface of the duct piece body and deviates to the first side or the second side, the length and the direction of the pulp bag are consistent with those of the outer arc surface, and two sides of the pulp bag are fixed on the outer arc surface in a sealing manner; the grouting pipe is embedded in the duct piece body, one end of the grouting pipe extends out of the inner arc surface of the duct piece body, and the other end of the grouting pipe extends out of the outer arc surface and is opposite to the grout bag; the first pulp bag protection part is arranged on the outer arc surface of the duct piece body and completely covers the pulp bag from the outer side, and can be separated from the duct piece body due to the extrusion of the pulp bag in the grouting expansion process of the pulp bag. The utility model discloses a to current section of jurisdiction structure improve, form self sealss section of jurisdiction structure, through to thick liquid bag slip casting make section of jurisdiction closed loop can with establish section of jurisdiction country rock support system all around, can play the effect of stabilizing this ring section of jurisdiction, and can fill the space between adjacent section of jurisdiction and the rock mass after this self sealss section of jurisdiction structure's thick liquid bag slip casting, run when having avoided the gravel backfill grout and move thick liquid phenomenon and section of jurisdiction staggered platform after and, the section of jurisdiction is damaged, the emergence of section of jurisdiction percolating water problem. The arrangement of the slurry bags can be manufactured in advance in a segment prefabricating field, the slurry bags can be directly used on the site, and the slurry bags can also be temporarily installed on the construction site, so that the slurry bags are flexible in form, simple and convenient to construct and good in practicability.

In some embodiments, the pulp bag is a rubber pulp bag, and is made of three layers of nitrile rubber and two layers of nylon cloth, and the maximum pressure bearing capacity is 5bar.

In some embodiments, the pulp bag is symmetrically folded on the outer arc surface of the duct piece body, and two sides of the pulp bag are fixed through a sealing mechanism.

In some embodiments, the sealing mechanism comprises a bolt and a pressure plate, the pressure plate is pressed on the upper surface of the pulp bag, and the bolt penetrates through the pressure plate and is fixed on the segment body.

In some embodiments, the sealing mechanism further comprises two smooth round pressing ribs, the two smooth round pressing ribs are respectively arranged on two sides of the bolt and between the pressing plate and the pulp bag, and the pressing plate is in press-connection with the upper surface of the pulp bag.

In some embodiments, the bolts and the pressure plates are arranged at intervals along the length direction of the pulp bag, and the smooth round pressing ribs are arranged in the full length, and the length of the smooth round pressing ribs is consistent with the length of the pulp bag.

In some embodiments, the self-sealing segment structure further comprises second pulp bag protection parts, wherein the second pulp bag protection parts are arranged on two sides of the pulp bag along the length direction of the pulp bag in a full-length mode, and the sealing mechanism is arranged between the pulp bag and the pulp bag.

In some embodiments, the second pulp pocket protection part is made of protection rubber, the cross section of the protection rubber is in a circular arc shape, the arc surface is concave to one side of the pulp pocket, and the lower part of the protection rubber is pressed on the upper surface of the pulp pocket and fixed on the segment body.

In some embodiments, the first pulp pocket protection part is a PA plate, the cross section of which is semi-elliptical, and two sides of the PA plate are adhered to the segment body through glue.

The utility model discloses another aspect provides a section of jurisdiction closed loop, this section of jurisdiction closed loop by the utility model discloses the self sealss section of jurisdiction structure that the first aspect provides forms with the mode head and the tail concatenation of the thick liquid bag dislocation of adjacent self sealss section of jurisdiction structure. The utility model discloses a section of jurisdiction closed loop plays fine unit area sealing, makes things convenient for the slip casting, improves the backfill quality. The construction of the closed ring structure without stopping is realized, the construction time is short, the cost is low, the safety is high, and the grout stopping effect is good.

The utility model discloses beneficial effect for prior art is: the self-sealing segment structure provided by the utility model can form segment closed rings by splicing the adjacent self-sealing segment structures end to end in a way that the slurry bags are staggered, and the segment closed rings and surrounding rocks can establish a segment slurry bag surrounding rock supporting system through grouting the slurry bags of the self-sealing segment structures, so that the effect of stabilizing the segment of the ring can be achieved, and large-scale attitude deviation of the segment can be prevented; the segment sealing ring can also play a good unit area sealing role, so that grouting is facilitated, and the backfilling quality is improved. The self-sealing segment structure perfectly solves the construction contradiction between the tunneling efficiency and the segment pea gravel backfilling grouting process, the closed ring structure construction without stopping is achieved, the construction time is short, the cost is low, the safety is high, and the grout stopping effect is good. Specifically, at least the following practical effects are obtained:

the slurry bag is a rubber slurry bag, is made of three layers of nitrile rubber and two layers of nylon cloth, is wear-resistant and heat-resistant, has the maximum pressure bearing of 5bar, and can respond to variable grouting pressure and various complex geological environments.

First thick liquid bag protection part uses glue to paste on the section of jurisdiction body, can the integrality of protective structure in the transportation, can prevent simultaneously that protruding on the country rock from causing the damage to the thick liquid bag behind the thick liquid bag slip casting inflation.

The second pulp bag protection part is arranged between the sealing mechanism and the pulp bag, and mainly plays a role in protecting the pulp bag and preventing the pulp bag from being damaged in the transportation process and the pulp bag from being damaged by the sealing mechanism in the grouting process.

It should be understood that the implementation of any embodiment of the present invention is not intended to provide all or a plurality of the above-described advantages at the same time.

It should be understood that what is described in this summary section is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like are only used for matching with the content disclosed in the specification, so as to be known and read by people skilled in the art, and are not used for limiting the practical limit condition of the present invention, so the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment still falls within the scope covered by the technical content disclosed in the present invention without affecting the function and the achievable purpose of the present invention.

Fig. 1 is a cross-sectional view of a self-sealing segment structure according to an embodiment of the present invention;

fig. 2 is a top view of a self-sealing segment structure according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a self-sealing segment according to an embodiment of the present invention;

fig. 4 is a schematic diagram of the splicing of a self-sealing tube structure and an adjacent self-sealing segment structure according to an embodiment of the present invention, wherein (a) is before grouting of a slurry bag, and (b) is after grouting of the slurry bag;

FIG. 5 is a schematic view of a segment seal ring structure after self-sealing segment structure assembly;

fig. 6 is a schematic sectional view showing a state where the segment sealing ring is completely constructed.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It is to be understood that the terms "comprises/comprising," "consists of/8230; \8230"; "consists of," or any other variation, are intended to cover a non-exclusive inclusion, such that a product, device, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, device, process, or method as may be desired. Without further limitation, an element defined by the phrases "comprising/including" \8230; "comprising 8230;" \8230; and \8230; "comprises;" does not exclude the presence of additional like elements in a product, device, process, or method comprising the element.

It is also to be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the appended drawings to indicate orientations or positional relationships, and are used merely for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device, component, or structure so referred to must have a particular orientation, be constructed or operated in a particular orientation, and are not to be construed as limiting the invention.

Two common closed rings (or named grout stopping peduncles) are provided, the first is to inject quick setting cement slurry between a pipe piece and a rock mass at intervals of 40-60m to form a closed space between areas, but in the actual construction process, a gap without support in the axial direction is difficult to form an effective closed ring capable of preventing grout from flowing between the areas in a liquid injection mode. And the second method is to adopt manual construction of a cement closed ring after the shield tail is separated, namely, the machine is stopped when the duct piece is separated from the TBM, and workers construct cement closure at the joint between the duct piece and the TBM. The closed ring constructed by the method has a complete structure and a good grout stopping effect, but the method is labor-consuming, high in cost, large in time cost and large in danger coefficient due to the fact that TBM (tunnel boring machine) stops tunneling during construction, and constructors are in a non-support area between the shield tail and the duct piece.

The utility model provides a self sealss section of jurisdiction structure and adjacent self sealss section of jurisdiction structure's the mode head and the tail concatenation of thick liquid bag dislocation can form the section of jurisdiction closed ring. The slurry bag grouting method has the advantages that the slurry bag grouting method for the self-sealing segment structure enables segment sealing rings to be capable of establishing a segment surrounding rock supporting system all around, the effect of stabilizing the segment of the ring can be achieved, gaps between adjacent segments and rock bodies can be filled after the slurry bag grouting of the self-sealing segment structure, and the slurry leakage phenomenon and the segment dislocation, segment damage and segment water leakage problems after the slurry bag grouting of the self-sealing segment structure are avoided when the bean gravel is backfilled and grouted.

The following describes the implementation of the present invention in detail with reference to preferred embodiments.

The utility model provides a self sealss section of jurisdiction structure, as shown in fig. 1 to fig. 3, including section of jurisdiction body 1, thick liquid bag 2, slip casting pipe 3 and first thick liquid bag protection part 4.

Referring to fig. 2 and 3, the segment body 1 is of an arc-shaped structure, the segment body 1 has an outer arc surface and an inner arc surface in the radial direction, and the segment body 1 has a first side and a second side in the axial direction.

The utility model discloses the first side of saying and second side are only a position indication, are the axial left and right sides or the left and right sides of section of jurisdiction body 1.

With continued reference to fig. 2 and 3, the pulp bag 2 is arranged on the outer arc surface of the segment body 1 and is deviated to the first side or the second side, the length and the trend of the pulp bag are consistent with the outer arc surface of the segment body 1, and the two sides of the pulp bag are sealed and fixed on the outer arc surface of the segment body 1.

It should be understood that the length and the trend of the pulp bag 2 are consistent with the outer arc surface of the duct piece body 1, the pulp bag 2 is arranged on one side of the duct piece body 1 along the length direction of the arc surface of the outer arc surface of the duct piece body 1, namely the length of the pulp bag 2 is at least consistent with the length of the duct piece body 1, so that the pulp bag 2 can be completely filled in the gap between the duct piece and the rock body after grouting, and the whole duct piece length range is completely covered.

The grout bag 2 is partial to first side or second side setting on the extrados of section of jurisdiction body 1 rather than the full width is laid or is laid between two parties on the extrados of section of jurisdiction body 1, be in order to ensure self sealss section of jurisdiction structure and adjacent self sealss section of jurisdiction structure when splicing head and the tail, the structural grout bag 2 of self sealss section of jurisdiction can the alternate joint overlap joint after the slip casting, completely fills the gap between adjacent self sealss section of jurisdiction structure, guarantees the leakproofness of seam crossing.

Grouting pipe 3 is pre-buried in section of jurisdiction body 1, and 3 one end of grouting pipe stretches out the intrados of section of jurisdiction body 1, and the other end stretches out the extrados of section of jurisdiction body 1 and just to thick liquid bag 2.

First thick liquid bag protection part 4 sets up on the extrados of section of jurisdiction body 1 and the cladding is in the outside of thick liquid bag 2 completely, and first thick liquid bag protection part 4 both sides are connected on the extrados of section of jurisdiction body 1 to can receive the extrusion of thick liquid bag 2 and break away from with section of jurisdiction body 1 at thick liquid bag 2 slip casting in-process.

It is easy to understand, first thick liquid bag protection part 4 receives the extrusion of thick liquid bag 2 can break away from with section of jurisdiction body 1 in order to ensure that can stretch to adjacent self sealss section of jurisdiction structure after thick liquid bag 2 slip casting, fills the space between adjacent self sealss section of jurisdiction structure, prevents to run the thick liquid emergence of scurrying thick liquid phenomenon of starching 2 slip casting.

In some embodiments, the segment body 1 may be a precast concrete segment structure or a steel segment structure, preferably a precast concrete segment structure.

It should be understood that the size of the precast concrete segment structure should correspond to the size of a tunnel in actual construction, and is not specifically limited herein.

In some embodiments, the grout bag 2 is a rubber grout bag, preferably a high-pressure thick grout bag made of three layers of nitrile rubber and two layers of nylon cloth, is wear-resistant and heat-resistant, can bear a maximum pressure of 5bar, and can cope with variable grouting pressure and various complex geological environments.

In some embodiments, the grouting pipe 3 is a grouting pipe with a diameter of 100mm, and the grouting pipe 3 should be designed and embedded in the segment body 1 according to the size and position of the segment body 1, so as to ensure the stability of grouting in the later stage grouting bag 2. The grouting pipe 3 can be pre-buried in the production and manufacturing process of the duct piece, and can also be installed by punching on the existing duct piece structure on site.

In some embodiments, the grout bag 2 is symmetrically folded on the outer arc surface of the segment body 1, so that the space can be saved, and the gap between the segment of the adjacent ring and the rock body can be filled after grouting of the grout bag 2.

Preferably, the two sides of the pulp bag 2 are fixed through the sealing mechanism, and the sealing mechanism completely fixes the two sides of the pulp bag 2 on the outer arc surface of the duct piece body 1, so that the pulp cannot run after the pulp bag 2 is grouted.

In some embodiments, the sealing mechanism on each side of the pulp bag 2 comprises a bolt 5 and a pressing plate 6, the pressing plate 6 is directly pressed on the upper surface of the pulp bag 2, the bolt 5 passes through the pressing plate 6 to be fixed on the segment body 1, and the edges of the two sides of the pulp bag 2 are sealed through the pressing plate 6.

Preferably, a plurality of bolts 5 are arranged on each side of the pulp bag 2, the bolts are uniformly arranged along the length direction of the pulp bag 2 at a certain distance, and the bolts 5 on two sides of the pulp bag 2 correspond to each other one by one.

Preferably, the pressing plates 6 can be arranged on both sides of the pulp pocket 2 at regular intervals along the length direction of the pulp pocket 2, and can also be arranged along the whole length direction of the pulp pocket 2.

It should be understood that the plurality may be three, four, or more, and the specific number is not limited herein as long as it can ensure that both sides of the pulp pocket 2 are completely sealed and fixed.

The preferred, bolt 5 adopts the hex bolts that the size is phi 22, and through laboratory test verification, phi 22's hex bolts is minimum to section of jurisdiction body 1's atress influence, and pre-buried bolt 5 can not influence life-span and security and waterproof nature of self sealss section of jurisdiction structure, and phi 22's hex bolts can satisfy the required pressure of fixing device simultaneously, adopts hex bolts to guarantee the commonality of device mounting tool, and the installation effectiveness is high.

Preferably, the pressing plate 6 is a steel pressing plate with the thickness of 20mm, and laboratory tests prove that the thickness of 20mm is the most appropriate thickness of the steel pressing plate under the condition of ensuring the pressure transmission effect, so that the weight can be reduced, and the cost is saved.

The pressing plate 6 uniformly applies the punctiform pressure of the bolts 5 on the upper surface of the pulp bag 2, thereby ensuring the sealing effect of the pulp bag 2.

In some embodiments, the sealing mechanism of each side further comprises a bead 7. Preferably, two pressing ribs 7 are arranged, the two pressing ribs 7 are respectively arranged on two sides of the bolt 5, the pressing ribs 7 are positioned between the pressing plate 6 and the pulp bag 2, and the pressing plate 6 is pressed on the upper surface of the pulp bag 2.

In some embodiments, the beads 7 are preferably smooth round beads which are arranged on both sides of the pulp pocket 2 in a full length manner, and the length of the smooth round beads is consistent with that of the pulp pocket 2.

It should be understood that the two beads 7 are arranged on two sides of the bolt 5 arranged along the length direction of the pulp bag 2, and the pulp bag 2 is pressed on the duct piece body 1 under the action of the pressing plate 6 to reduce the gap between the pulp bag and the duct piece body, so that sealing between different materials is realized.

Preferably, the ribbing 7 is a smooth round ribbing with the size of phi 20.

In some embodiments, the self-sealing segment structure further comprises a second pulp bag protecting part 8, the second pulp bag protecting part 8 is arranged along the length direction of the pulp bag 2, the second pulp bag protecting part 8 is arranged on two sides of the pulp bag 2, and the sealing mechanism is arranged between the pulp bag 2 and the pulp bag.

It should be understood that the second pulp pocket protecting portion 8 mainly functions to protect the pulp pocket 2 from both sides, preventing the pulp pocket 2 from being damaged during transportation and the pulp pocket 2 from being damaged by the sealing mechanism during grouting.

Preferably, the second slurry bag protecting part 8 is made of protecting rubber, the cross section of the protecting rubber is arc-shaped, the arc surface is concave to one side of the slurry bag 2, and the lower part of the protecting rubber is in compression joint with the upper surface of the slurry bag 2 and is fixed on the duct piece body 1 through a bolt 5.

Preferably, the protective rubber is made of wear-resistant thick rubber, the rubber has certain elasticity, and the surface of the rubber is coated with a lubricant, such as butter, so that the protective rubber not only plays a role of protecting the pulp bag 2, but also can be unfolded outwards together with the pulp bag 2 after grouting.

It should be understood that the protection rubber is set to be arc-shaped and the cambered surface is concave to one side of the pulp bag 2, the pulp bag 2 is wrapped from two sides like two hands in a natural state, after the two sides of the pulp bag are prevented from damaging the pulp bag 2 and grouting and expanding, two sides of the pulp bag 2 can be completely attached to the protection rubber, the pulp bag 2 stretches outwards along with the expansion and extrusion of the pulp bag 2, the pulp bag 2 extends outwards in the length direction and the width direction, the protection rubber can isolate the pipe piece from the pulp bag 2, and meanwhile, the lubricant on the surface of the protection rubber can reduce the resistance borne by the pulp bag 2 during grouting and expanding in the symmetrical folding process.

In some embodiments, the first slurry bag protection part 4 is a PA plate, the cross section of which is semi-elliptical, and two sides of which are adhered to the segment body 1 by glue. The semi-elliptical design can completely cover the pulp bag 2 from the periphery and reduce the friction force between the pulp bag 2 and the first pulp bag protection part 4 in the grouting expansion process.

The PA board wear resistance is good, still prevents scraping and prevents the puncture, uses glue to paste the outside of section of jurisdiction body 1 with the PA board both ends of wrapping up whole thick liquid bag 2, can the integrality of protection device in the transportation, can realize droing under predetermined pressure after the thick liquid bag 2 slip casting inflation simultaneously, presses the PA board on the country rock, can prevent that the protruding on the country rock from causing the damage to thick liquid bag 2.

Preferably, the glue has the characteristics of no pollution, moderate fluidity and short consolidation time, and can naturally fall off in the grouting expansion process of the slurry bag 2 to remove the connection between the PA plate and the segment body 1.

It should be understood that the glue is used for adhering the PA plate to the outer arc surface of the segment body 1 in the transportation process of the self-sealing segment structure instead of permanently adhering the two ends of the PA plate to the segment body 1, so that the integrity of the self-sealing segment structure in the transportation process is ensured; glue water still needs to drop in the grouting expansion process of the slurry bag 2, and the connection between the PA plate and the duct piece body 1 is removed. The slurry bag 2 can be extended to the adjacent pipe pieces to fill gaps between the adjacent pipe pieces after grouting and expansion, and the sealing performance of the joint is guaranteed.

In some embodiments, the end of the grouting pipe 3 extending out of the intrados of the segment body 1 is provided with a grouting port 9. It should be understood that the grouting port 9 is provided on the intrados side of the segment body 1 for the convenience of mounting and dismounting.

Preferably, the grouting opening 9 is an integrated intelligent grouting opening, and the grouting opening 9 is integrated with a pressure sensor, a safety valve and a plugging device. The intelligent slip casting mouth integrates can guarantee the security and the reliability of slip casting process, can real-time supervision thick liquid pressure in the thick liquid bag 2 simultaneously, and the slip casting volume of in time adjusting solves the inaccurate problem of slip casting pipeline thick liquid pressure monitoring.

The self-sealing segment structure does not need die sinking to rework, only a pair of phi 22 hexagon bolts with a certain transverse distance are buried at a certain interval vertically on an original normal segment, namely, a segment body 1, a grouting pipe 3 and a grouting opening 9 are reserved on the segment body 1, high-pressure rubber slurry bags are respectively inserted into two rows of bolts 5, the slurry bags 2 are folded between the two rows of bolts 5 in a folding mode, wear-resistant thick rubber protection slurry bags with approximate strip-shaped cross sections are placed on the outer sides of the slurry bags 2, a phi 20 smooth circular pressing rib with the same length as the segment body 1 is respectively placed outside the wear-resistant thick rubber on two sides of each row of bolts 5, a 20mm thick steel pressing plate is used for pressing the phi 20mm thick steel pressing plate on the phi 20 smooth circular pressing rib, the smooth circular pressing rib is prevented from moving, the bolts 5 are screwed up through round-head nuts 51 above the 20mm thick steel pressing plate, and finally, two ends of a PA plate covered on the whole slurry bags 2 are adhered on the segment body 1 by glue to protect the whole slurry bags 2 from damage incidents.

In some embodiments, referring to fig. 4 and 5, the self-sealing segment structures and the adjacent self-sealing segment structures are spliced end to end in a staggered mode through the pulp bags 2 on the segment body 1, and the pulp bags are overlapped with the end parts of the pulp bags to form a segment sealing ring.

It should be noted that the shapes of the duct piece and the grout bag in fig. 3 and fig. 5 are only schematic, and are intended to show the arrangement of the grout bag on the duct piece and the staggered overlapping effect in the splicing state, and are not intended to limit the shape of the grout bag and the grouting expansion thereof, and the grouting expansion shape of the grout bag is also related to the size of the grout bag, the grouting pressure, and the size of the space between the duct piece and the surrounding rock.

It should be understood that, here thick liquid bag 2 dislocation concatenation is that thick liquid bag 2 on two adjacent section of jurisdiction bodies 1 is not arranging with one side, arranges respectively in the left and right sides of section of jurisdiction body 1, guarantees that the thick liquid bag 2 of the self sealss section of jurisdiction structure that the head and the tail concatenation is in the same place can be in the same place in the dislocation overlap joint after thick liquid bag 2 slip casting, and the gap between the adjacent self sealss section of jurisdiction structure can be completely filled in the mutual extrusion between two adjacent thick liquid bags 2 after thick liquid bag 2 slip casting, guarantees the leakproofness of seam crossing.

The head-to-tail splicing is that the head of the self-sealing segment structure and the tail of the self-sealing segment structure after being integrally turned are spliced together; the tail of the self-sealing segment structure is spliced with the head of the self-sealing segment structure after being integrally turned.

It should be understood that the beginning and end references herein are an orientation indication, referring to one end and the other end of each self-sealing segment structure.

After the self-sealing segment structure is assembled into a complete segment closed ring, a grouting pump is connected to a grouting valve nozzle of a grouting pipe 3 reserved in a segment body 1 through a grouting controller for grouting, so that a high-pressure rubber slurry bag is in contact with surrounding rock to establish sealing, grouting is stopped and a grouting device is removed after a set grouting pressure (3 bar or higher) is reached, and a grouting pressure value in the slurry bag 2 is monitored at any time.

It should be understood that the grouting pump is a grouting pump in a common TBM matching trolley, and the grouting pump does not need to be additionally installed, so that the universality is good.

The construction method for forming the segment closed ring by the self-sealing segment structure comprises the following steps:

s1: filling the common duct pieces with the soybean gravel in a 3-ring blowing mode after the common duct pieces are separated from the shield tail;

s2: assembling the self-sealing segment structures every 20 rings to form segment sealing rings integrally;

s3: grouting slurry bags on self-sealing segments on segment sealing rings, wherein the slurry bags expand and are tightly pressed between a segment body and surrounding rocks, and the slurry bags on adjacent self-sealing segments are lapped end to end so that an annular sealing area is formed between the periphery of the segment sealing rings and the surrounding rocks;

s4: and grouting and filling the annular closed area, and establishing a permanent support.

Like fig. 6, the whole ring of the sealed ring of the pre-buried pulp bag segment for completing grouting can play a role in stabilizing the segment of the ring by building a segment pulp bag surrounding rock supporting system with surrounding rocks through the pulp bag 2, and can play a role in stabilizing the segment group in the 20 rings through the fixed structure between the ring and the ring, so that the large-scale posture deviation of the segment is prevented.

The constructed segment sealing ring can also play a good role in sealing a unit area, bean gravel backfilling grouting is carried out in a sealed area, the pressure uniformity of the regional bean gravel backfilling grouting is guaranteed, the phenomenon of slurry running and slurry channeling is prevented, the bean gravel backfilling grouting effect at the top of the segment sealing ring is guaranteed, and the quality of a backfilling body is improved. Meanwhile, the formed segment closed ring perfectly solves the construction contradiction between the tunneling efficiency and the segment pea gravel backfilling grouting process, the segment closed ring structure construction without shutdown is achieved, the construction time is short, the cost is low, the safety is high, and the slurry stopping effect is good. The utility model discloses be particularly useful for TBM tunnel construction, the section of jurisdiction closed loop is the same with TBM tunnel size, and every ring canal piece closed loop includes multi-disc concrete segment, for example four, and four concrete segments can be the same or different, for example two about the section of jurisdiction size the same and on the large side, about two section of jurisdiction sizes the same and on the small side, specifically according to the designing requirement of tunnel construction and the preparation technology of section of jurisdiction.

It should be understood that to the filling thick liquid in the thick liquid bag 2 on the section of jurisdiction body 1, the utility model discloses there is not extra requirement, only need consider can annotate nature, appropriate setting time, and satisfy the intensity of ordinary grout can.

It will be readily appreciated by those skilled in the art that the various preferences described above may be freely combined, superimposed without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A self-sealing segment structure, comprising:

the duct piece body is of an arc-shaped structure, is provided with an outer arc surface and an inner arc surface in the radial direction, and is provided with a first side and a second side in the axial direction;

the pulp bag is arranged on the outer arc surface of the duct piece body and is deviated to the first side or the second side, the length and the direction of the pulp bag are consistent with those of the outer arc surface, and two sides of the pulp bag are fixed on the outer arc surface in a sealing mode;

the grouting pipe is embedded in the duct piece body, one end of the grouting pipe extends out of the inner arc surface of the duct piece body, and the other end of the grouting pipe extends out of the outer arc surface and is opposite to the grout bag;

the first pulp bag protection part is arranged on the outer arc surface of the duct piece body and completely covers the pulp bag from the outer side, and can be separated from the duct piece body due to the extrusion of the pulp bag in the grouting expansion process of the pulp bag.

2. The self-sealing segment structure of claim 1, wherein the grout bag is a rubber grout bag made of three layers of nitrile rubber sandwiched by two layers of nylon cloth, and the maximum pressure bearing is 5bar.

3. The self-sealing segment structure of claim 1, wherein the pulp bag is symmetrically folded on the outer arc surface of the segment body, and two sides of the pulp bag are fixed by a sealing mechanism respectively.

4. The self-sealing segment structure of claim 3, wherein the sealing mechanism comprises a bolt and a pressure plate, the pressure plate is pressed on the upper surface of the pulp bag, and the bolt penetrates through the pressure plate and is fixed on the segment body.

5. The self-sealing segment structure of claim 4, wherein the sealing mechanism further comprises two smooth circular beads, the two smooth circular beads are respectively arranged on two sides of the bolt and between the pressing plate and the pulp bag, and the pressing plate is pressed on the upper surface of the pulp bag.

6. The self-sealing segment structure of claim 5, wherein the bolts and the pressing plates are uniformly spaced along the length direction of the pulp pocket, and the smooth circular ribs are arranged in a full length, and the length of the smooth circular ribs is consistent with the length of the pulp pocket.

7. The self-sealing segment structure of claim 3, further comprising a second pulp pocket protection part, wherein the second pulp pocket protection part is arranged on both sides of the pulp pocket along the length direction of the pulp pocket, and between the sealing mechanism and the pulp pocket.

8. The self-sealing segment structure of claim 7, wherein the second bladder protection member is made of a protective rubber having a circular arc-shaped cross section, the arc surface is recessed toward the bladder, and the lower portion of the protective rubber is pressed against the upper surface of the bladder and fixed to the segment body.

9. The self-sealing segment structure of claim 1, wherein the first serous sac protecting part is a PA plate, the cross section of the first serous sac protecting part is semi-elliptical, and two sides of the first serous sac protecting part are stuck on the segment body through glue.

10. A segment closure ring, characterized in that it is formed by end-to-end splicing of self-sealing segment structures according to any of claims 1 to 9 in such a way that the pulp pockets of adjacent self-sealing segment structures are staggered.

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