CN112593972A - Steel drum supporting structure for tunnel and mounting method thereof - Google Patents
Steel drum supporting structure for tunnel and mounting method thereof Download PDFInfo
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- CN112593972A CN112593972A CN202011381178.7A CN202011381178A CN112593972A CN 112593972 A CN112593972 A CN 112593972A CN 202011381178 A CN202011381178 A CN 202011381178A CN 112593972 A CN112593972 A CN 112593972A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 122
- 239000010959 steel Substances 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000011435 rock Substances 0.000 claims abstract description 93
- 239000004576 sand Substances 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 13
- 238000004080 punching Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a steel drum supporting structure for a tunnel and an installation method thereof, wherein the steel drum supporting structure comprises a steel drum supporting structure, the steel drum supporting structure is formed by combining two sections of symmetrical half-drum structures, a preformed hole is processed on an arc-shaped plate of each half-drum structure, a hole cover is arranged at the position of the preformed hole, and the bottom of each half-drum structure is fixedly connected with the bottom of the tunnel through a drum bottom fixing structure; and sand is filled between the steel drum supporting structure and the surrounding rock of the tunnel. The supporting structure overcomes the defects of the prior tunnel supporting technology, and the steel drum supporting structure reduces the consumable material as much as possible on the premise of meeting the stress requirement, thereby achieving the purpose of saving the cost.
Description
Technical Field
The invention relates to the field of tunnel lining support construction, in particular to a steel drum support structure for a tunnel and an installation method thereof.
Background
Nowadays, with the progress of construction technology, the traditional techniques for supporting surrounding rocks such as steel arch frames and net racks are gradually improved. However, the factors affecting the tunnel engineering are complex and various, and the more critical factors are two, the first critical factor is the existence of high ground stress, and the most typical disasters caused by the high ground stress to the tunnel engineering are as follows: rockburst for hard and brittle rock mass; for soft rock, the cavern is deformed greatly. In the conventional supporting technology, no matter steel arch support or net rack support, due to the existence of high ground stress, the stress unevenness of a tunnel supporting structure is very obvious, so that for the supporting structure, the steel arch or the net rack are in contact with surrounding rocks in a point form, and the maximum acting force of the supporting structure from the surrounding rocks must be taken as a design basis during design, so that when the supporting structure is locally damaged, the part with smaller stress far does not exert the self strength, and the waste of material cost is caused. The second key factor is the length of the surrounding rock near-air time, for the traditional supporting technology, no matter the net rack supporting or the steel arch frame supporting, the supporting structure is installed on site after the tunnel is excavated, in the installation process, the surrounding rock is always in the near-air state, and the part with larger stress of the surrounding rock is likely to deform too much without supporting due to the overlong near-air time, so that the local damage of the surrounding rock and even the block falling phenomenon occur.
Disclosure of Invention
The invention aims to provide a steel drum supporting structure for a tunnel and an installation method thereof, the supporting structure overcomes the defects of the existing tunnel supporting technology, and the steel drum supporting structure reduces consumable materials as much as possible on the premise of meeting the stress requirement, thereby achieving the purpose of saving cost.
In order to achieve the technical features, the invention is realized as follows: a steel drum supporting structure for a tunnel comprises a steel drum supporting structure, wherein the steel drum supporting structure is formed by combining two sections of symmetrical half-drum structures, a preformed hole is processed on an arc-shaped plate of each half-drum structure, a hole cover is arranged at the position of the preformed hole, and the bottom of each half-drum structure is fixedly connected with the bottom of the tunnel through a drum bottom fixing structure; and sand is filled between the steel drum supporting structure and the surrounding rock of the tunnel.
The half-barrel structure is formed by assembling and welding an arc-shaped plate, a pressure rod, an outer chord and a web member; the pressing rods are fixed on the inner side wall of the arc-shaped plate in a vertical welding mode, and four two-force rods are fixedly welded at the end parts of four adjacent pressing rods to form an outer chord together; and the diagonal positions of the outer chords are welded and fixed with the two-force rods to form the web members together.
The interior of the compression bar is filled with expansive concrete.
The preformed holes are arranged at equal intervals along the radian transition position of the arc-shaped plate.
The barrel bottom fixing structure comprises right-angle steel plates which are reversely and symmetrically arranged on two sides of the bottom of the half barrel structure, the right-angle steel plates are fixedly connected with the half barrel structure through screws and nuts, and the right-angle steel plates are fixedly connected with the bottom surface of the tunnel through ultra-long anchor rods; the bottom end of the half-barrel structure extends into the bottom surface of the tunnel for a section of length.
The installation method of the steel drum supporting structure for the tunnel comprises the following steps:
step1, preparation of material: preparing corresponding materials and equipment according to a steel barrel supporting structure, wherein the materials and the equipment comprise a half barrel structure, an arc-shaped plate, a pressure lever, an outer chord member, a web member, expanded concrete, a screw, a nut, a right-angle steel plate, sand, an ultra-long anchor rod, a hole cover, an electric welding machine, a sand washing machine, slurry, a high-pressure grouting machine, a pressure relief valve and a punching machine;
step2, machining a prepared hole in the arc plate: uniformly punching holes at equal intervals along the arc turning part of the arc plate by using a punching machine to form a reserved hole, and additionally arranging a hole cover at the reserved hole to prepare for subsequent sand washing, pressure relief valve installation and grouting;
step3, preparing a symmetrical two-section half-barrel structure: the half-barrel structure is formed by welding an arc plate and a plurality of unit bodies consisting of steel pipes and two force rods, and the connection mode of the single unit body and the arc plate is as follows: four steel pipes are uniformly distributed and welded on the inner side of the arc-shaped plate in a mode of being perpendicular to the inner side of the arc-shaped plate, expanded concrete is filled in the steel pipes, four two-force rods are welded at the end parts of the four steel pipes after the expanded concrete is solidified, the four two-force rods are used as outer chords, two-force rods are welded at the diagonal lines of two bodies of the unit body, and the two-force rods are used as web members;
step4, performing tunnel excavation according to actual construction requirements;
step5, observing whether the surrounding rock cracks once the tunnel is excavated, and immediately driving an overlong anchor rod at the position of the surrounding rock where the cracks appear if the surrounding rock cracks appear, so as to prevent the surrounding rock from being damaged or even falling into blocks due to overlarge deformation of the cracks;
step6, once the tunnel is excavated, rapidly transporting the two half-barrel structures to the appointed position in the excavated tunnel, and rapidly connecting the two half-barrel structures into an integral steel barrel supporting structure with stable stress in a welding mode;
step7, burying bucket feet of a steel bucket supporting structure in the bottom surface of a tunnel, additionally arranging two right-angle steel plates on two sides of the steel bucket feet, connecting the right-angle steel plates with the steel bucket supporting structure by using screws and nuts, and reinforcing and connecting the right-angle steel plates and the bottom surface of the tunnel by driving ultra-long anchor rods into the right-angle steel plates;
step8, rapidly injecting sand into the hollow layer between the arc-shaped plate and the surrounding rock through the reserved holes on the arc-shaped steel plate by using a sand flushing machine, so that sand bodies are filled and are in close uninterrupted contact with the surrounding rock surface and the outer side surface of the arc-shaped steel plate;
step9, installing a pressure relief valve at the hole after sand washing is finished, and setting a certain threshold value according to the actual engineering condition;
step10, observing the sand leakage amount of each part of the steel drum supporting structure, judging the stress and deformation condition of the surrounding rock according to the sand leakage amount, and if the sand leakage amount is large, indicating that the stress and deformation of the surrounding rock are large; if the sand leakage amount at the position is small, the stress and deformation of the surrounding rock at the position are small; for the position with large sand leakage amount, a two-force rod is additionally arranged on the steel drum supporting structure at the position in a welding mode, and for the position with small sand leakage amount or even no sand leakage amount, the two-force rod on the steel drum structure at the position is properly disassembled;
step11, after the surrounding rock is stable, namely when the sand leakage amount of each part of the surrounding rock is almost zero or less, the stress and deformation of each part of the surrounding rock are stable, and the pressure relief valve is removed;
and Step12, grouting the sand layer between the rock surrounding surface and the outer side surface of the arc-shaped plate through the reserved hole by using a high-pressure grouting machine to form a whole with stable stress between the sand and the slurry, and closing the hole cover after grouting is finished.
The invention has the following beneficial effects:
1. the invention realizes the surface type supporting of the steel drum supporting structure to the surrounding rock, and ensures that the supporting structure bears the pressure from the surrounding rock more uniformly.
2. According to the method, once the tunnel is excavated, whether the surrounding rock cracks or not is observed, if the surrounding rock cracks, the overlong anchor rod is driven into the position of the cracked surrounding rock, and the surrounding rock is prevented from being damaged or even falling into blocks due to overlarge crack deformation.
3. According to the invention, a layer of sand is paved on the outer side of the steel drum, so that the surrounding rock is allowed to deform to a certain degree, the stress of the surrounding rock is reduced, the surrounding rock pressure borne by the steel drum is reduced, and the damage of a supporting structure caused by excessive local deformation of the surrounding rock is effectively avoided.
4. According to the invention, the steel pipe is used as the compression bar, and the expansion concrete is filled in the compression bar, so that the compression resistance of the expansion concrete is fully utilized, steel is greatly saved, and the cost is reduced.
5. The two half-barrel structures are manufactured before the tunnel is excavated, and once the tunnel is excavated, the two half-barrel structures are transported to the designated position in the tunnel to be welded and assembled, so that the surrounding rock can be quickly supported, the temporary time of the surrounding rock surface is greatly shortened, and the risk that the surrounding rock is damaged or even falls due to the fact that the surrounding rock deforms too much because the temporary time is too long is reduced.
6. According to the invention, the sand is used for filling the separation layer between the steel drum and the surrounding rock, the sand is low in price, and the cost of filling materials is saved.
7. According to the invention, the stress and deformation conditions of all parts of the surrounding rock can be rapidly judged according to the sand leakage amount.
8. The invention adds the rod piece on the local steel drum supporting structure at the position with large surrounding rock pressure, namely the position with large sand discharge amount, and has simple reinforcing treatment.
9. According to the invention, part of the rod pieces are disassembled on the local steel drum supporting structure at the position with small surrounding rock pressure, namely the position with small sand leakage amount, so that materials are recycled, the material waste is reduced, and the material cost is reduced.
10. The steel drum supporting structure provided by the invention has the advantages of high supporting performance, low material cost and simple construction, can conveniently and quickly support surrounding rocks under various conditions, is widely applied to the field of tunnel supporting with complex rock-soil factors, and has wide engineering practice significance and application prospect.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a schematic longitudinal section of the present invention.
Fig. 3 is a schematic view of the connection mode of the bucket bottom fixing device and the tunnel bottom surface.
Fig. 4 is a schematic view of the invention for driving a super-long anchor rod at a crack.
FIG. 5 is a perspective view of the strut of the present invention.
Fig. 6 is a view of the structure of the half-barrel of the present invention.
In the figure: the device comprises a half-barrel structure 1, an arc-shaped plate 2, a pressure lever 3, an outer chord 4, a web member 5, expanded concrete 6, a screw 7, a nut 8, a right-angle steel plate 9, sand 10, an ultra-long anchor rod 11, a hole cover 12, an electric welding machine (13), a sand washing machine 14, slurry 15, a high-pressure grouting machine 16, a pressure relief valve 17, a punching machine 18, a reserved hole 19 and a crack 20.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-6, a steel drum supporting structure for a tunnel includes a steel drum supporting structure, the steel drum supporting structure is formed by combining two symmetrical half-drum structures 1, a preformed hole 19 is processed on an arc plate 2 of the half-drum structure 1, a hole cover 12 is arranged at the position of the preformed hole 19, and the bottom of the half-drum structure 1 is fixedly connected with the bottom of the tunnel through a drum bottom fixing structure; and sand 10 is filled between the steel drum supporting structure and the surrounding rock of the tunnel. Through the steel drum supporting structure with the structure, the steel drum supporting structure can be used for supporting the surrounding rock in a surface mode, and the supporting structure can bear the pressure from the surrounding rock more uniformly.
Further, the half-barrel structure 1 is formed by assembling and welding an arc-shaped plate 2, a pressure rod 3, an outer chord 4 and a web member 5; the compression bars 3 are fixed on the inner side wall of the arc-shaped plate 2 in a vertical welding mode, and four two-force rods are welded and fixed at the end parts of four adjacent compression bars 3 to form an outer chord 4 together; and the diagonal positions of the outer chords 4 are welded and fixed with two-force rods to form web members 5 together.
The semi-barrel structure 1 is formed by welding a plurality of sections of two-force rods and steel pipes, and aims to simplify the welding operation of the two-force rods and the steel pipes.
Further, the interior of the compression bar 3 is filled with expansive concrete 6. The filling expansion concrete 6 aims to fully utilize the compression resistance of the expansion concrete, save steel and reduce cost.
Further, settle the relief valve at the sand washing hole after the sand washing, its aim at directly utilizes the hole installation relief valve after the sand washing is accomplished, installation easy operation, the accessible comes stress size and the deformation condition of this department's country rock from the sand volume of relief valve relief behind the installation relief valve roughly fast judgement.
Further, design preparation steel drum supporting construction before tunnel excavation, its aim at, once the tunnel has been excavated, just can be executed immediately and do the steel drum supporting construction that has made, the time of being in the air of surrounding rock face that has significantly reduced has reduced the risk that the surrounding rock is destroyed even the piece falls because of the too big surrounding rock deformation that leads to of the time of being in the air of surrounding rock.
Further, the preformed holes 19 are arranged equidistantly along the arc transition of the arc plate 2. Its aim at punch at this department and make subsequent sand washing operation more convenient, and make the sand of filling through this hole and arc lateral surface and surrounding rock surface contact inseparabler and do not have and be interrupted.
Further, use sand washing machine to annotate sand, its aim at to the cavity course between arc and the country rock through the reservation hole on the arc 2: 1. a buffer layer is formed between the surrounding rock and the steel drum structure, and the surrounding rock can evenly apply pressure to the steel drum through the sand ring. 2. The sand has fluidity, and the sand layer allows the surrounding rock to deform to a certain degree, so that the stress of the surrounding rock is reduced, and the function of yielding is achieved.
Treat that the country rock is warp to stabilize and then to the interior slip casting of sand circle, its aim at: 1. the strength of the sand ring is increased by 2, and the sand ring is adhered to the surrounding rock and the steel barrel in a grouting mode, so that the three parts form a whole, and the overall stability of the support is improved.
Connect into steel drum supporting construction with two sections half-barrel structures through the welding, its aim at welding easy operation, can install the staving fast, strut the country rock, reduce the country rock time of being free.
The tunnel has the crack department to squeeze into overlength stock immediately after the excavation at the surrounding rock, and its aim at reduces the influence that high ground stress warp to the surrounding rock, struts the surrounding rock from the surrounding rock is inside, acts as the first hand to the surrounding rock and struts, and is quick and effective, prevents to fall the piece phenomenon even because of the large deformation of the surrounding rock that struts untimely and lead to.
Further, the barrel bottom fixing structure comprises right-angle steel plates 9 which are reversely and symmetrically arranged on two sides of the bottom of the half barrel structure 1, the right-angle steel plates 9 are fixedly connected with the half barrel structure 1 through screws 7 and nuts 8, and the right-angle steel plates 9 are fixedly connected with the bottom surface of the tunnel through ultra-long anchor rods 11; the bottom end of the half-barrel structure 1 extends into the bottom surface of the tunnel for a certain length. Its aim at improves steel drum supporting construction's force stability, prevents that steel drum supporting construction from strutting the effect because of being connected stability not enough and greatly reduced between bucket foot and the tunnel bottom surface.
Further, make two sections half barrel structures, its aim at be convenient for carry two sections half barrel structures into assigned position in the tunnel fast and weld the equipment after follow-up tunnel excavation, reduce the face of enclosing rock and face the time of being free.
Example 2:
the installation method of the steel drum supporting structure for the tunnel comprises the following steps:
step1, preparation of material: preparing corresponding materials and equipment according to a steel drum supporting structure, wherein the materials and the equipment comprise a half-drum structure 1, an arc-shaped plate 2, a pressure lever 3, an outer chord 4, a web member 5, expanded concrete 6, a screw 7, a nut 8, a right-angle steel plate 9, sand 10, an ultra-long anchor rod 11, a hole cover 12, an electric welding machine, a sand flushing machine, slurry, a high-pressure grouting machine, a pressure relief valve and a punching machine;
step2, machining a prepared hole 19 in the arc plate 2: uniformly punching holes at equal intervals along the radian turning part of the arc-shaped plate 2 by using a punching machine to form a reserved hole 19, and additionally arranging a hole cover 12 at the reserved hole 19 to prepare for subsequent sand washing 10, pressure relief valve installation and grouting 18;
step3, preparing a symmetrical two-section half-barrel structure 1: half barrel construction 1 is formed by arc 2 and a plurality of cell cube welding that constitute by steel pipe, two power poles, and single cell cube is with arc 2's connected mode: four steel pipes are uniformly distributed and welded on the inner side of the arc-shaped plate 2 in a mode of being perpendicular to the inner side of the arc-shaped plate 2, expanded concrete 6 is filled in the steel pipes, four two-force rods are welded on the end parts of the four steel pipes after the expanded concrete 6 is completely solidified, the four two-force rods are used as outer chords 4, two-force rods are welded on two diagonal lines of the unit body, and the two-force rods are used as web members 5;
step4, performing tunnel excavation according to actual construction requirements;
step5, observing whether the surrounding rock has a crack 20 once the tunnel is excavated, and immediately driving an overlong anchor rod 11 at the position of the surrounding rock with the crack 20 if the crack 20 occurs, so as to prevent the surrounding rock from being damaged or even falling into blocks due to overlarge crack deformation;
step6, once the tunnel is excavated, rapidly transporting the two half-barrel structures 1 to the appointed positions in the excavated tunnel, and rapidly connecting the two half-barrel structures into an integral steel barrel supporting structure with stable stress in a welding mode;
step7, burying the bucket foot of the steel bucket supporting structure 1 in the bottom surface of the tunnel, additionally arranging two right-angle steel plates 9 on two sides of the steel bucket foot, connecting the right-angle steel plates 9 with the steel bucket supporting structure by using a screw 7 and a nut 8, and reinforcing and connecting the right-angle steel plates 9 with the bottom surface of the tunnel by driving an ultralong anchor rod 11 into the right-angle steel plates 9;
step8, rapidly injecting sand 10 into the hollow layer between the arc-shaped plate 2 and the surrounding rock through the reserved hole on the arc-shaped steel plate 2 by using a sand flushing machine, so that sand bodies are filled and are in close and uninterrupted contact with the surrounding rock surface and the outer side surface of the arc-shaped steel plate 2;
step9, installing a pressure relief valve at the hole after sand washing is finished, and setting a certain threshold value according to the actual engineering condition;
step10, observing the sand leakage amount of each part of the steel drum supporting structure, judging the stress and deformation condition of the surrounding rock according to the sand leakage amount, and if the sand leakage amount is large, indicating that the stress and deformation of the surrounding rock are large; if the sand leakage amount at the position is small, the stress and deformation of the surrounding rock at the position are small; for the position with large sand leakage amount, a two-force rod is additionally arranged on the steel drum supporting structure at the position in a welding mode, and for the position with small sand leakage amount or even no sand leakage amount, the two-force rod on the steel drum structure at the position is properly disassembled;
step11, after the surrounding rock is stable, namely when the sand leakage amount of each part of the surrounding rock is almost zero or less, the stress and deformation of each part of the surrounding rock are stable, and the pressure relief valve is removed;
step12, grouting the sand layer between the surrounding rock surface and the outer side surface of the arc-shaped plate 2 through the reserved hole 19 by using a high-pressure grouting machine to form a whole body with stable stress between the sand and the slurry, and closing the hole cover after grouting.
Claims (6)
1. The utility model provides a steel drum supporting construction for tunnel which characterized in that: the steel drum supporting structure is formed by combining two sections of symmetrical half-drum structures (1), a preformed hole (19) is processed on an arc-shaped plate (2) of each half-drum structure (1), a hole cover (12) is arranged at the position of the preformed hole (19), and the bottom of each half-drum structure (1) is fixedly connected with the bottom of a tunnel through a drum bottom fixing structure; and sand (10) is filled between the steel drum supporting structure and the surrounding rock of the tunnel.
2. The steel drum supporting structure for a tunnel according to claim 1, wherein: the half-barrel structure (1) is formed by assembling and welding an arc-shaped plate (2), a pressure rod (3), an outer chord (4) and a web member (5); the pressing rods (3) are fixed on the inner side wall of the arc-shaped plate (2) in a vertical welding mode, and four two-force rods are welded and fixed at the end parts of four adjacent pressing rods (3) to form an outer chord (4) together; and the diagonal positions of the outer chord members (4) are welded and fixed with two-force rods to form a web member (5) together.
3. The steel drum supporting structure for a tunnel according to claim 2, wherein: the interior of the compression bar (3) is filled with expansion concrete (6).
4. The steel drum supporting structure for a tunnel according to claim 1, wherein: the preformed holes (19) are arranged at equal intervals along the radian transition position of the arc-shaped plate (2).
5. The steel drum supporting structure for a tunnel according to claim 1, wherein: the bucket bottom fixing structure comprises right-angle steel plates (9) which are reversely and symmetrically arranged on two sides of the bottom of the half-bucket structure (1), the right-angle steel plates (9) are fixedly connected with the half-bucket structure (1) through screws (7) and nuts (8), and the right-angle steel plates (9) are fixedly connected with the bottom surface of the tunnel through ultralong anchor rods (11); the bottom end of the half-barrel structure (1) extends into the bottom surface of the tunnel for a section of length.
6. The method of installing the steel tub supporting structure for the tunnel according to any one of claims 1 to 5, comprising the steps of:
step1, preparation of material: preparing corresponding materials and equipment according to a steel barrel supporting structure, wherein the corresponding materials and equipment comprise a half barrel structure (1), an arc-shaped plate (2), a pressure lever (3), an outer chord (4), a web member (5), expanded concrete (6), a screw (7), a nut (8), a right-angle steel plate (9), sand (10), an ultra-long anchor rod (11), a hole cover (12), an electric welding machine, a sand washing machine, mud, a high-pressure grouting machine, a pressure relief valve and a punching machine;
step2, machining a prepared hole (19) in the arc-shaped plate (2): uniformly punching holes at equal intervals along the radian turning part of the arc-shaped plate (2) by using a punching machine to form a reserved hole (19), and additionally arranging a hole cover (12) at the reserved hole (19) to prepare for subsequent sand washing (10), pressure relief valve installation and grouting (18);
step3, preparing a symmetrical two-section half-barrel structure (1): half bucket structure (1) is formed by arc (2) and a plurality of cell cube welding that constitute by steel pipe, two power poles, and the connected mode of single cell cube and arc (2) is: four steel pipes are uniformly distributed and welded on the inner side of the arc-shaped plate (2) in a mode of being perpendicular to the inner side of the arc-shaped plate (2), expanded concrete (6) is filled in the steel pipes, four two-force rods are welded on the end parts of the four steel pipes after the expanded concrete (6) is completely condensed, the four two-force rods are used as outer chords (4), two-force rods are welded on diagonal lines of two bodies of the unit body, and the two-force rods are used as web members (5);
step4, performing tunnel excavation according to actual construction requirements;
step5, observing whether the surrounding rock has cracks (20) once the tunnel is excavated, and immediately driving an overlong anchor rod (11) at the surrounding rock where the cracks (20) appear if the cracks (20) appear, so as to prevent the surrounding rock from being damaged or even falling into blocks due to overlarge deformation of the cracks;
step6, once the tunnel is excavated, rapidly transporting the two half-barrel structures (1) to the appointed positions in the excavated tunnel, and rapidly connecting the two half-barrel structures into an integral steel barrel supporting structure with stable stress in a welding mode;
step7, burying barrel feet of a steel barrel supporting structure (1) in the bottom surface of a tunnel, additionally arranging two right-angle steel plates (9) on two sides of the steel barrel feet, connecting the right-angle steel plates (9) with the steel barrel supporting structure by using a screw (7) and a nut (8), and reinforcing and connecting the right-angle steel plates (9) with the bottom surface of the tunnel by driving an overlong anchor rod (11) into the right-angle steel plates (9);
step8, using a sand blasting machine to rapidly inject sand (10) into a hollow layer between the arc-shaped plate (2) and the surrounding rock through a reserved hole on the arc-shaped steel plate (2), so that sand bodies are filled and are in close uninterrupted contact with the surrounding rock surface and the outer side surface of the arc-shaped steel plate (2);
step9, installing a pressure relief valve at the hole after sand washing is finished, and setting a certain threshold value according to the actual engineering condition;
step10, observing the sand leakage amount of each part of the steel drum supporting structure, judging the stress and deformation condition of the surrounding rock according to the sand leakage amount, and if the sand leakage amount is large, indicating that the stress and deformation of the surrounding rock are large; if the sand leakage amount at the position is small, the stress and deformation of the surrounding rock at the position are small; for the position with large sand leakage amount, a two-force rod is additionally arranged on the steel drum supporting structure at the position in a welding mode, and for the position with small sand leakage amount or even no sand leakage amount, the two-force rod on the steel drum structure at the position is properly disassembled;
step11, after the surrounding rock is stable, namely when the sand leakage amount of each part of the surrounding rock is almost zero or less, the stress and deformation of each part of the surrounding rock are stable, and the pressure relief valve is removed;
and Step12, grouting the sand layer between the surrounding rock surface and the outer side surface of the arc-shaped plate (2) through the reserved hole (19) by using a high-pressure grouting machine to form a whole body with stable stress between sand and slurry, and closing the hole cover after grouting is finished.
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| CN202011381178.7A CN112593972B (en) | 2020-12-01 | 2020-12-01 | Steel drum supporting structure for tunnel and mounting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280860A (en) * | 1997-04-01 | 1998-10-20 | Shimizu Corp | Method for connecting existing tunnel to new tunnel |
| CN105041332A (en) * | 2015-07-13 | 2015-11-11 | 三峡大学 | Grid lining structure for tunnels and mounting method thereof |
| CN108019222A (en) * | 2017-11-20 | 2018-05-11 | 三峡大学 | A kind of tunnel lining structure filled using haydite and construction method |
| CN109859607A (en) * | 2019-03-22 | 2019-06-07 | 三峡大学 | Simulate the device and method of arch tunnel different zones stress |
| CN110318773A (en) * | 2019-06-21 | 2019-10-11 | 三峡大学 | The gate-type liquid lining cutting country rock pressure relief device and construction method of regulatable magnetic force |
-
2020
- 2020-12-01 CN CN202011381178.7A patent/CN112593972B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280860A (en) * | 1997-04-01 | 1998-10-20 | Shimizu Corp | Method for connecting existing tunnel to new tunnel |
| CN105041332A (en) * | 2015-07-13 | 2015-11-11 | 三峡大学 | Grid lining structure for tunnels and mounting method thereof |
| CN108019222A (en) * | 2017-11-20 | 2018-05-11 | 三峡大学 | A kind of tunnel lining structure filled using haydite and construction method |
| CN109859607A (en) * | 2019-03-22 | 2019-06-07 | 三峡大学 | Simulate the device and method of arch tunnel different zones stress |
| CN110318773A (en) * | 2019-06-21 | 2019-10-11 | 三峡大学 | The gate-type liquid lining cutting country rock pressure relief device and construction method of regulatable magnetic force |
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| CN112593972B (en) | 2022-12-20 |
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