CN113586079B - Tunnel cross intersection structure and construction method thereof - Google Patents
Tunnel cross intersection structure and construction method thereof Download PDFInfo
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- CN113586079B CN113586079B CN202110974691.5A CN202110974691A CN113586079B CN 113586079 B CN113586079 B CN 113586079B CN 202110974691 A CN202110974691 A CN 202110974691A CN 113586079 B CN113586079 B CN 113586079B
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- anchor rods
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- straight wall
- mortar
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 50
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 230000008093 supporting effect Effects 0.000 claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 25
- 238000009412 basement excavation Methods 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 20
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Abstract
The invention provides a tunnel cross intersection structure and a construction method thereof. The tunnel cross intersection structure comprises an intersection part, wherein the intersection part comprises a lower straight wall structure and an upper dome structure; every other straight wall is provided with a supporting hole; the intersection part is tightly attached to surrounding rock and provided with an initial support; the support hole is clung to the surrounding rock and is sequentially provided with a primary support and a secondary lining; a plurality of mortar anchor rods driven into surrounding rock are arranged at the primary support position of the support hole, and a reinforcing mesh is hung on the mortar anchor rods; a plurality of steel arches are arranged along the longitudinal direction of the supporting hole; the lower part of the intersection is provided with a plurality of mortar anchor rods and prestressed anchor rods which are driven into surrounding rock, and a reinforcing mesh is hung on the prestressed anchor rods; and a plurality of mortar anchor rods driven into surrounding rock, prestressed anchor rods and reinforcing steel bar meshes are arranged along the concentric anchor rod arrangement lines in a staggered manner. Compared with the related art, the method has the advantage that the large-span dome cross intersection can be excavated in the class II and class III surrounding rock section holes with good geological conditions.
Description
Technical Field
The invention relates to the technical field of tunnel engineering construction, in particular to a tunnel cross intersection structure and a construction method thereof.
Background
In road construction in a water conservancy and hydropower construction plant, the road construction is limited by topography, and the situation that a route crosses in a hole exists in underground cavity road design and construction. In view of the requirements of structural stability and safety, tunnel intersections are generally selected to be arranged in class II surrounding rock and class III surrounding rock with good geological conditions.
The cross intersection structure of the tunnel is characterized in that four cross branches are cross-shaped, and the included angles of adjacent branches are close to 90 degrees. When designing this intersection structure, at present there are two common practices in China: a direct cross structure with four branches without expanding excavation has the advantages of small excavation amount, low construction difficulty and low cost, but poor structure stress and traffic conditions; the other is a 'small-hole traffic big-hole' structure with two branches being dug in a expanding way and the other two branches not being dug in a expanding way, the structure is relatively good in stress and traffic conditions, but the construction difficulty is high, and the construction cost is high.
As in the prior art, patent publication No.: CN107975383a, patent name: the construction method for excavating and supporting the T-shaped intersection of the underground cavity comprises the following steps of: CN107387131a, patent name: an asymmetric fork supporting structure and a construction method thereof, patent publication number: CN205895242U, patent name: a tunnel structure of a small-angle intersection relates to a T-shaped intersection or a small-angle Y-shaped intersection formed by three cross branches in the prior art, and is not suitable for the situation of the cross intersection in a hole.
Therefore, when the routes in the holes are crisscrossed, the available structure types are few, and the design and construction complete technology is few.
Disclosure of Invention
The invention aims to provide a tunnel cross intersection structure with good stress and suitable for a level II surrounding rock section and a level III surrounding rock section with good geological conditions and a construction method thereof.
The technical scheme of the invention is as follows: the tunnel cross intersection structure comprises an intersection part, wherein the intersection part comprises a lower straight wall structure and an upper dome structure arranged at the upper end of the lower straight wall structure; the upper dome structure is a shell structure with a spherical surface; the lower straight wall structure is an eight-face straight wall structure which is symmetrically distributed by eight straight walls; every other straight wall is provided with a supporting hole which is communicated with the intersection part;
the intersection part is tightly attached to surrounding rock and provided with an initial support; the support hole is clung to the surrounding rock and is sequentially provided with a primary support and a secondary lining;
a plurality of mortar anchor rods driven into surrounding rock are arranged at the primary support position of the support hole, and a reinforcing mesh is hung between the mortar anchor rods; a plurality of steel arches are arranged along the longitudinal direction of the supporting hole, and the steel arches are connected in a staggered manner through connecting steel bars;
the primary support of the straight wall structure at the lower part of the intersection is provided with a plurality of mortar anchor rods and prestressed anchor rods which are driven into surrounding rock in a staggered manner, and a reinforcing mesh is hung between the mortar anchor rods and the prestressed anchor rods;
the central vertex of the dome structure at the upper part of the intersection part is provided with a prestress anchor rod, the prestress anchor rod is radially outwards from the vertex in sequence, a plurality of concentric circle anchor rod arrangement lines are annularly arranged, a plurality of mortar anchor rods and prestress anchor rods which are driven into surrounding rocks are alternately arranged along each concentric circle anchor rod arrangement line, and a reinforcing mesh is hung between the mortar anchor rods and the prestress anchor rods.
In the scheme, the intersection part adopts a structure of a spray anchor lining and a cast-in-place concrete side wall arranged at the side wall of the lower part of the straight wall; the intersection part adopts a structure which is provided with a mortar anchor rod and is combined with a prestress anchor rod for reinforcement; the construction partition of the intersection part comprises an upper step and a lower step; the intersection part adopts an anchor spraying lining structure which is constructed to be an upper step in the circumferential subsection firstly and then constructed to be a lower step in the circumferential subsection; and the reinforcing structure of the composite lining (primary support and secondary lining) of the support hole is combined, so that an effective lateral constraint and support effect is provided for the large-span dome structure, and the safety and stability of the large-span cross intersection structure in the hole are ensured. In addition, the octahedral straight wall structure basically and symmetrically distributed in the lower straight wall structure can symmetrically spread four traffic branch roads on one hand, so that road routes in the hole are crossed in a cross manner; on the other hand, the structure symmetry can realize that the stress is basically symmetrical, the stress is more uniform, and the stability is better, so that the excavation of a large-span dome cross intersection in a class II surrounding rock section and a class III surrounding rock section with better geological conditions becomes possible.
Preferably, in the concentric circle anchor rod arrangement lines, 6n mortar anchor rods and prestressed anchor rods are alternately arranged on the nth concentric circle, wherein n is a natural number greater than 0, 3n is the mortar anchor rods, 3n is the prestressed anchor rods, and the number of the mortar anchor rods is the same as that of the prestressed anchor rods.
Preferably, two steel arches are arranged at the joint of each branch hole and the intersection part.
Preferably, the steel arch comprises a plurality of connecting steel bars, and the steel arches are connected in a staggered manner through the connecting steel bars.
Preferably, the three-dimensional surrounding rock excavation area surrounded by the outer surface of the lower straight wall structure forms a lower step, and the three-dimensional surrounding rock excavation area surrounded by the outer surface of the upper dome structure forms an upper step.
The invention also provides a construction method of the tunnel cross intersection structure, which comprises the following steps:
1) Digging one of the support holes, firstly spraying concrete to seal surrounding rock after forming, then drilling a mortar anchor rod, hanging a reinforcing steel bar net, erecting a steel arch, and then spraying concrete again;
2) Digging a sector part of an upper step of an intersection part, which is close to the supporting hole, firstly spraying concrete after forming, then, spraying a mortar anchor rod and a prestressed anchor rod towards surrounding rock, hanging a reinforcing mesh, and then spraying concrete again to form an initial support;
3) Sequentially excavating other sector parts of the upper step of the intersection part in a circumferential direction part way, after each sector part is excavated and formed, primarily spraying concrete according to the method of the step 2), arranging a mortar anchor rod and a prestressed anchor rod, hanging a reinforcing steel bar net, and secondarily spraying concrete to form an initial support, and circulating until the whole upper step is excavated and supported and formed, so as to form a dome structure on the upper part of the intersection part;
4) Sequentially excavating lower steps of the intersection part in a circumferential subsection mode, and after each excavation forming step is carried out from the straight wall subsection close to the supporting hole in the step 1), primarily spraying concrete according to the method in the step 2), hanging a reinforcing steel bar net, secondarily spraying concrete to form an initial support, and circulating until the whole lower step is excavated and supported for forming, and setting cast-in-situ side walls at the positions of the four straight walls of the intersection part which are not communicated with the supporting hole and are clung to the inner sides of the initial support to form a straight wall structure at the lower part of the intersection part;
5) Excavating other branch holes according to the method of the step 1);
6) Step 4) the lower straight wall structure consists of an octahedral straight wall structure, wherein every other face of the straight wall is communicated with the support holes excavated in the step 1);
7) Step 2), 3) the upper step consists of eight sector parts; step 4) the lower step consists of eight straight wall sections;
8) Pouring all the excavated and formed branch holes to form the secondary lining.
The scheme adopts the new Ottoman method for construction, and in the section with good surrounding rock (the section with good geology of II-level surrounding rock and III-level surrounding rock), the self-bearing capacity of the surrounding rock is fully utilized, so that a good supporting effect is achieved.
Preferably, step 1.1 is further included between step 1) and step 2), two steel arches are erected at the joint of the support hole formed by excavation in step 1) and the intersection, each steel arch is from one side wall to the other side wall of the support hole, and the inner side and the outer side of the steel arch are connected by connecting steel bars in a staggered manner to form a complete arch wall supporting reinforcing ring.
Preferably, the direction of the annular subsection excavation in the step 3) and the step 4) is clockwise or anticlockwise.
Compared with the related art, the invention has the beneficial effects that: the tunnel cross intersection structure enables excavation of a large-span dome cross intersection in a class II and class III surrounding rock section with good geological conditions to be possible; the intersection adopts spouted anchor lining, the support hole adopts compound lining, and the mode that both combine makes construction convenient, make full use of country rock self-supporting ability, has reached fine supporting effect, has overcome atress and the economic defect of traditional common practice to have novel structure appearance, the reasonable technological advantage of atress.
Drawings
Fig. 1 is a schematic structural view of a tunnel cross intersection structure provided by the invention;
fig. 2 is a schematic diagram of the arrangement of steel arches and anchor rods in the tunnel cross structure provided by the invention;
FIG. 3 is a schematic plan view of the arrangement at A in FIG. 2;
fig. 4 is a schematic perspective sectional view of a hole and an intersection in fig. 2.
In the attached drawings, a 1-intersection part, a 101-lower straight wall structure, a 102-upper dome structure, a 2-support hole I, a 3-support hole II, a 4-support hole III, a 5-support hole IV, a 6-steel arch frame, a 7-mortar anchor rod, an 8-prestressed anchor rod, a 9-support hole, a 10-primary support, an 11-secondary lining, a 12-cast-in-situ side wall, 13-connecting steel bars and 14-concentric circle anchor rod arrangement lines are arranged.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.
As shown in fig. 1 to 4, the tunnel cross intersection structure provided in this embodiment includes an intersection portion 1, where the intersection portion 1 includes a lower straight wall structure 101 and an upper dome structure 102 disposed at an upper end of the lower straight wall structure 101, and the upper dome structure 102 is a shell structure with a spherical surface. The lower straight wall structure 101 is an eight-sided straight wall structure formed by eight straight walls and distributed substantially symmetrically. Every other straight wall is provided with a supporting hole 9, and the supporting holes 9 are communicated with the intersection part 1.
The intersection part 1 is provided with an initial support 10 closely attached to surrounding rock. The support hole 9 is clung to surrounding rock and is sequentially provided with an initial support 10 and a secondary lining 11.
The primary support of the support hole 9 is provided with a plurality of mortar anchor rods 7 which are driven into surrounding rock, and a reinforcing mesh is hung between the mortar anchor rods 7. And a plurality of steel arches 6 are arranged along the longitudinal direction of the supporting hole 9, and the steel arches 6 are connected with each other in a staggered way through connecting steel bars 13 at the inner side and the outer side of the steel arches 6. The support hole 9 is clung to surrounding rock and is sequentially provided with an initial support 10 and a secondary lining 11. The support hole 9 forms a composite lining structure through the combination of the primary support 10 and the secondary lining 11, plays a good role in strengthening, provides effective lateral constraint and support for the large-span dome structure, and ensures the safety and stability of the large-span cross structure.
Two steel arches 6 are arranged at the joint of each branch hole 9 and the intersection part 1, and the two steel arches 6 are connected through connecting steel bars 13.
The primary support of the lower straight wall structure 101 of the intersection part 1 is alternately provided with a plurality of mortar anchor rods 7 and prestressed anchor rods 8 which are driven into surrounding rock, and a reinforcing mesh is hung between the mortar anchor rods 7 and the prestressed anchor rods 8.
The central vertex of the dome structure 102 at the upper part of the intersection part 1 is provided with a prestress anchor rod 8, a plurality of concentric circle anchor rod arrangement lines 14 are radially arranged radially outwards from the vertex in sequence, and a plurality of mortar anchor rods 7 and prestress anchor rods 8 driven into surrounding rocks are alternately arranged along each concentric circle anchor rod arrangement line 14. In the concentric circle anchor rod arrangement lines 14, 6n mortar anchor rods 7 and prestressed anchor rods 8 are alternately arranged on the n concentric circles, wherein n is a natural number greater than 0, 3n is the mortar anchor rods 7,3n is the prestressed anchor rods 8, and the number of the mortar anchor rods 7 is the same as that of the prestressed anchor rods 8. A reinforcing mesh is also hung between the prestressed anchor rod 8 and the mortar anchor rod 7.
The flexible primary support 10 consisting of the mortar anchor rods 7, the prestressed anchor rods 8, the reinforcing mesh and the sprayed concrete is arranged at the intersection part 1 and is closely attached to surrounding rock, so that the deformation of the surrounding rock can be well adapted.
For convenience in description of the construction method, the branch hole 9 is divided into a branch hole I2, a branch hole II 3, a branch hole III 4 and a branch hole IV 5 for description.
The invention also provides a construction method of the tunnel cross intersection structure, which comprises the following steps:
1) One of the branch holes 9 (branch hole one 2) is excavated, after forming, the concrete is sprayed to seal surrounding rock, then the mortar anchor rod 7 is arranged towards the surrounding rock, the reinforcing steel bar net is hung, the steel arch 6 is erected, the connecting reinforcing steel bars 13 are erected on the steel arch 6, and then the concrete is sprayed again.
2) Two steel arches 6 are arranged at the joint of the first supporting hole 2 and the intersection part 1, each steel arch 6 extends from one side wall to the other side wall of the supporting hole 9, and the inner side and the outer side of the steel arch 6 are connected by connecting steel bars 13 in a staggered manner to form a complete arch wall supporting reinforcing ring.
3) The step on the excavation intersection part 1 is close to the sector part of the first supporting hole 2, concrete is sprayed firstly after forming, then a mortar anchor rod 7 and a prestressed anchor rod 8 are arranged towards surrounding rock, a reinforcing mesh is hung, and the concrete is sprayed again to form an initial support 10.
4) The rest sector parts of the upper step of the intersection part 1 are sequentially excavated in a circumferential direction subsection mode, after each sector part is excavated and formed, concrete is sprayed firstly according to the method of the step 2), a mortar anchor rod 7 and a prestressed anchor rod 8 are arranged, a reinforcing mesh is hung, concrete is sprayed again to form an initial support 10, and the cycle is carried out until the whole upper step is excavated and supported and formed, so that the dome structure 102 at the upper part of the intersection part 1 is formed.
5) Sequentially excavating steps of the intersection part 1 in a circumferential subsection mode, and after each excavation forming step is carried out from the straight wall subsection close to the first support hole 2 in the step 1), primarily spraying concrete according to the method in the step 2), arranging a mortar anchor rod 7 and a prestressed anchor rod 8, hanging a reinforcing steel bar net, and secondarily spraying concrete to form an initial support (10), so that the circulation is carried out until the whole steps are excavated and supported for forming, and the cast-in-situ side wall 12 is arranged at the positions of the straight walls of the intersection part 1, which are not communicated with the first support hole 2, the second support hole 3 and the third support hole 4 and the fourth support hole 5, and the lower straight wall structure 101 of the intersection part 1 is formed by tightly attaching the inner side of the initial support.
6) Excavating and supporting the second supporting hole 3, the third supporting hole 4 and the fourth supporting hole 5 according to the method of the step 1), and arranging the steel arch 6 and the connecting steel bars 13 according to the method of the step 2).
7) Pouring a first branch hole 2, a second branch hole 3, a third branch hole 4 and a fourth branch hole 5 to form a secondary lining 11.
The excavation is carried out from the first branch hole 2, and can be actually carried out from any one of the second branch hole 3, the third branch hole 4 or the fourth branch hole 5. The circumferential subsection excavation direction can be clockwise or anticlockwise.
The lower step is a three-dimensional surrounding rock excavation area surrounded by the outer surface of the lower straight wall structure 101, and is composed of eight straight wall parts, wherein four straight wall parts are respectively communicated with a first branch hole 2, a second branch hole 3, a third branch hole 4 and a fourth branch hole 5. The upper step is a three-dimensional surrounding rock excavation area surrounded by the outer surface of the upper dome structure 102, and consists of eight sector-shaped subsections.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. The tunnel cross intersection structure is characterized by comprising an intersection part (1), wherein the intersection part (1) comprises a lower straight wall structure (101) and an upper dome structure (102) arranged at the upper end of the lower straight wall structure (101); the upper dome structure (102) is a shell structure with a spherical surface; the lower straight wall structure (101) is an eight-sided straight wall structure with eight straight walls symmetrically distributed; every other straight wall is provided with a supporting hole (9), and the supporting holes (9) are communicated with the intersection part (1);
the intersection part (1) is tightly attached to surrounding rock and is provided with an initial support (10); the support hole (9) is clung to surrounding rock and is sequentially provided with an initial support (10) and a secondary lining (11);
a plurality of mortar anchor rods (7) for driving surrounding rock are arranged at the primary support position of the support hole (9), and a reinforcing mesh is hung between the mortar anchor rods (7); a plurality of steel arches (6) are arranged along the longitudinal direction of the supporting hole (9), and the steel arches (6) are connected with each other in a staggered way through connecting steel bars (13) at the inner side and the outer side of the steel arches (6);
the primary support of the straight wall structure (101) at the lower part of the intersection part (1) is provided with a plurality of mortar anchor rods (7) and prestressed anchor rods (8) which are driven into surrounding rock in a staggered manner, and a reinforcing mesh is hung between the mortar anchor rods (7) and the prestressed anchor rods (8);
the central vertex of the dome structure (102) at the upper part of the intersection part (1) is provided with a prestress anchor rod (8), a plurality of concentric circle anchor rod arrangement lines (14) are radially arranged radially outwards from the vertex in sequence, a plurality of mortar anchor rods (7) and prestress anchor rods (8) which are driven into surrounding rocks are arranged on each concentric circle anchor rod arrangement line (14) in a staggered mode, and a reinforcing mesh is hung between the mortar anchor rods (7) and the prestress anchor rods (8).
2. The tunnel cross intersection structure according to claim 1, wherein in the concentric circle anchor rod arrangement lines (14), 6n mortar anchor rods (7) and prestressed anchor rods (8) are alternately arranged on an nth concentric circle, wherein n is a natural number greater than 0, 3n is the mortar anchor rods (7), 3n is the prestressed anchor rods (8), and the number of the mortar anchor rods (7) is the same as the number of the prestressed anchor rods (8).
3. Tunnel crossroad structure according to claim 1 or 2, characterized in that each of said branch holes (9) is provided with two steel arches (6) at the junction with said intersection (1).
4. The tunnel crossroad structure according to claim 1 or 2, wherein the stereoscopic surrounding rock excavation area surrounded by the outer surface of the lower straight wall structure (101) forms a lower step, and the stereoscopic surrounding rock excavation area surrounded by the outer surface of the upper dome structure (102) forms an upper step.
5. A method of constructing a tunnel junction structure as claimed in any one of claims 1 to 3, comprising the steps of:
1) Digging one of the branch holes (9), firstly spraying concrete to seal surrounding rock after forming, then, drilling a mortar anchor rod (7), hanging a reinforcing steel bar net, erecting a steel arch (6) towards the surrounding rock, and then spraying concrete again;
2) Excavating a sector part of an upper step of an intersection part (1) close to the supporting hole (9), firstly spraying concrete after forming, then, arranging a mortar anchor rod (7) and a prestressed anchor rod (8) towards surrounding rock, hanging a reinforcing mesh, and then spraying concrete again to form an initial support (10);
3) Sequentially excavating the rest sector parts of the upper step of the intersection part (1) in a circumferential direction part way, after each sector part is excavated and formed, primarily spraying concrete according to the method of the step 2), arranging a mortar anchor rod (7) and a prestressed anchor rod (8), hanging a reinforcing steel bar net, and secondarily spraying concrete to form an initial support (10), so as to circulate until the whole upper step is excavated and supported and formed, and forming an upper dome structure (102) of the intersection part (1);
4) Sequentially excavating steps of the intersection part (1) in a circumferential subsection mode, and after each excavation forming step is carried out on the straight wall subsection close to the supporting hole (9) in the step 1), primarily spraying concrete according to the method in the step 2), arranging a mortar anchor rod (7) and a prestressed anchor rod (8), hanging a reinforcing steel bar net, secondarily spraying concrete to form an initial support (10), circulating until the whole step is excavated and supported to form, and arranging cast-in-situ side walls (12) close to the inner side of the initial support at the four straight walls of the intersection part (1) which are not communicated with the supporting hole (9), so as to form a straight wall structure (101) of the lower part of the intersection part (1);
5) Excavating other branch holes (9) according to the method of the step 1);
6) Step 4) the lower straight wall structure (101) consists of an octahedral straight wall structure, wherein every other face of the straight wall is communicated with the support holes excavated in the step 1);
7) Step 2), 3) the upper step consists of eight sector parts; step 4) the lower step consists of eight straight wall sections;
8) Pouring all the excavated and molded branch holes (9) to form a secondary lining (11).
6. The construction method of the tunnel cross intersection structure according to claim 5, wherein the construction method further comprises a step 1.1 between the step 1) and the step 2), wherein two steel arches (6) are erected at the joint of the support hole (9) formed by excavation in the step 1) and the intersection part (1), each steel arch (6) is connected from one side wall to the other side wall of the support hole (9) by connecting steel bars (13) at the inner side and the outer side of the steel arch (6), and a complete arch wall supporting reinforcing ring is formed.
7. The method for constructing a tunnel intersection structure according to claim 5, wherein the direction of the circumferential sub-excavation in the step 3) and the step 4) is clockwise or counterclockwise.
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