CN110067581A - The arrangement and construction method of trouble or opening armored concrete branch sheath embedded hole are opened in tunnel or tunnel - Google Patents

Abstract

Trouble or opening armored concrete branch sheath embedded hole arrangement and construction method are opened in a kind of tunnel or tunnel, it is disclosed when the branch sheath construction of trouble or opening is opened in tunnel or tunnel, process by increasing the fixed several plastic tubes of steel ring, realizes that arrangement is used for the built-in pipe of demolition blasting blasthole.It is broken or the occasions such as cannot expose that the present invention is suitable for tunnel or roadway surrounding rock, avoids bore operation, shortens the duration, reduce construction cost, brings good economic and social benefit.

Description

Arrangement of pre-buried holes in reinforced concrete supporting layers at tunnel or roadway forks or openings formula and construction method

technical field

The invention relates to the field of blasting engineering, in particular to an arrangement and construction method of pre-buried holes in a reinforced concrete supporting layer at a tunnel or a roadway fork or opening.

Background technique

In the construction of underground engineering, some intersecting tunnels or roadways will be designed. In order to facilitate the connection with another tunnel or roadway during construction, it is possible to take no support at the tunnel or roadway that needs to be split or open, and wait for another tunnel or roadway. The roadway was built and supported together. However, sometimes the surrounding rock in tunnel or roadway excavation is too broken or cannot be exposed to the air for a long time, and support work must be carried out immediately, otherwise the tunnel or roadway may partially collapse. Therefore, in order to connect with another tunnel or roadway, it is necessary to carry out the fork or opening operation on the side wall of the well-supported tunnel or roadway. Usually blasting technology is an efficient method for tunnels or roadways to open forks or openings. The common practice in engineering is to drill holes at the forks or openings of the supported tunnels, and arrange more holes along the normal direction of the surface of the support layer. A gun hole, and explosives are installed in the gun hole to blast the fork or opening. There are many disadvantages to this approach:

1. Due to the existence of steel mesh, steel arches, connecting bars, and bolts in the supporting layer of the tunnel or roadway, drilling is very difficult, and more blast holes are required in through blasting, so the drilling cost is often very high.

2. Due to the large number of holes, the requirements of manual drilling on the position of the blasthole and the angle control of the blasthole are not accurate, thus affecting the blasting effect.

3. The number of holes is large, and manual drilling is very time-consuming, prolonging the construction period and possibly affecting the stability of the tunnel structure.

4. A large amount of dust generated by drilling has caused pollution to the environment.

In order to solve the above problems, at the beginning of the design, the arrangement and construction method of the pre-buried holes in the reinforced concrete supporting layer at the openings or openings of the tunnel or roadway should be considered, and the pipeline should be pre-buried along the normal direction of the surface of the supporting layer of the tunnel or roadway. , to achieve the purpose of providing blastholes for future tunnel or roadway switching or opening blasting.

SUMMARY OF THE INVENTION

The problem to be solved by the present invention is to provide an arrangement and construction method of the pre-buried holes in the reinforced concrete supporting layer at the opening or opening of the tunnel or roadway. , Design the layout of the fork and the pre-buried hole at the opening, fix the pre-buried pipeline during the support construction, and the pre-buried pipeline to form the fork or the blast hole for the opening blasting excavation, so as to achieve high efficiency, low cost, green blasting, Purpose of opening.

The purpose of the present invention is to realize in this way: a kind of tunnel or roadway fork or opening place reinforced concrete supporting layer pre-buried hole layout and construction method, when tunnel or roadway supporting construction, according to the design of each circle of blastholes The contour lines are used to make steel bars of the same shape. After the bolting process is driven into the tunnel wall, two rows of parallel steel bars are welded and fixed to the bolts, and the embedded pipes are tied and fixed with the steel bars at the corresponding positions. Tunnel support work to form pre-buried blastholes.

The pre-embedded pipe adopts PVC plastic pipe.

A construction method for arranging pre-buried holes in a reinforced concrete supporting layer at the fork or opening of a tunnel or roadway, comprising the following steps:

1) After the tunnel or roadway section is excavated to the fork or opening, remove the floating dust and cuttings at the fork or opening, and then drill the hole, insert the hollow bolt into the hole, and make the extension of the bolt less than the supporting layer. Thickness, add a gasket at the tail, screw on the nut and then grouting, erect the steel mesh and bind it with the anchor rod, and then spray the anchor to form the spray anchor layer;

2) On the surface of the shotcrete layer, erect the steel ring of the pre-embedded undercutting pipe, the steel ring of the pre-embedded auxiliary pipe, and the steel ring of the pre-embedded peripheral pipe, which are fixedly connected with the bolt. The outlines of the pre-embedded peripheral holes, pre-embedded auxiliary holes, and pre-embedded cut holes are the same, and steel arches are erected at certain distances in the direction of the vertical tunnel centerline, and then a layer of the same reinforcement is arranged at a certain distance from the previous layer of reinforcement circles. The steel ring includes the steel ring of the pre-embedded undercut pipe, the steel ring of the pre-embedded auxiliary pipe, and the steel ring of the embedded peripheral pipe, and is welded with the anchor rod so that the planes of the two layers of the steel ring are parallel;

3) Arrange the pre-embedded peripheral pipes, the pre-embedded auxiliary pipes in the outer ring and the pre-embedded undercut pipes perpendicular to the surface of the reinforced concrete supporting layer, with one end extending to the inside of the supporting layer and the other end extending to the surface of the supporting layer. The pre-embedded depth of the pipe and the pre-embedded auxiliary pipe is less than the thickness of the supporting layer. The two ends of the grooved pipe are respectively bound on two layers of steel bars with a certain distance in turn; the two ends of the empty pre-embedded pipe are respectively bundled and tightened with a wire, and the other end of the wire is tied vertically to the steel ring of the pre-embedded cut pipe. On the side, the two ends of the single inner ring pre-embedded auxiliary pipe are respectively tied with tie wires, and the other end of the tie wire is bound with the three fixed outer ring pre-embedded auxiliary pipes, and all the pre-embedded pipes are sealed with plastic films. ;

4) Spray concrete again to completely cover the steel arch to form a respray layer;

5) Construct a waterproof layer on the surface of the compound spray layer, arrange steel bars along the side walls and arches, use a lining trolley to form a vertical form, pour concrete and tamp it.

The above step 1) has another construction method. After the tunnel or roadway section is excavated at the fork or opening, high-pressure wind is used to clean the floating dust and cuttings on the rock surface at the fork or opening, and the initial spray is carried out on the clean rock surface. After the concrete is solidified, use a drilling machine to drill holes, insert the hollow anchor rod, and make the extension length of the anchor rod less than the thickness of the supporting layer, add a gasket at the tail, screw the nut and then grouting, erect the steel mesh and weld the anchor rod Or tied with wire.

Another construction method of step 5) is to construct a waterproof layer on the surface of the compound spray layer, and use a lining trolley to form a vertical form along the side wall and the arch, pour concrete and compact it.

Step 5) Another construction method is to excavate the inverted arch, and arrange steel bars at the place and pour concrete with vertical formwork. Lining the vertical form of the trolley, pouring concrete and tamping.

A construction method for arranging a reinforced concrete supporting tunnel or roadway fork or opening pre-buried hole, comprising the following steps:

2) A layer of reinforcement rings is arranged parallel to the surface of the shotcrete layer, which includes reinforcement rings for pre-embedded undercut pipes, reinforcement rings for pre-embedded auxiliary pipes, and reinforcement rings for pre-embedded peripheral pipes, which are welded to the anchor rod, and their shapes are respectively the same as those of the fork. Or the pre-embedded peripheral holes, pre-embedded auxiliary holes, and pre-embedded undercut holes at the opening have the same outline, and then arrange a layer of the same reinforcement ring at a certain distance from the previous layer of reinforcement circles, including the pre-embedded undercut pipe reinforcement. ring, fixed pre-embedded auxiliary pipe reinforcement ring, pre-embedded peripheral pipe reinforcement ring, and welded with the anchor rod, so that the planes of the two layers of reinforcement rings are parallel;

3) Arrange the pre-embedded peripheral pipes, the pre-embedded auxiliary pipes in the outer ring and the pre-embedded undercut pipes perpendicular to the surface of the reinforced concrete supporting layer, with one end extending to the inside of the supporting layer and the other end extending to the surface of the supporting layer. The pre-embedded depth of the pipe and the pre-embedded auxiliary pipe is less than the thickness of the supporting layer. The two ends of the grooved pipe are respectively bound on the two layers of steel bars in turn; the two ends of the empty pre-embedded pipe are respectively tied and tightened with a wire, and the other end of the wire is tied vertically on the edge of the steel ring of the pre-embedded cut pipe. The two ends of the inner ring pre-embedded auxiliary pipes are respectively tied with ties, the other end of the ties is bound with the three fixed outer ring pre-embedded auxiliary pipes, and all the pre-embedded pipes are sealed with plastic films at their upper and lower openings;

4) Construct a waterproof layer on the surface of the shotcrete layer, then arrange steel bars along the side walls and arches, use a lining trolley to form a vertical form, pour concrete and tamp it.

The above step 1) has another construction method. After the tunnel or roadway section is excavated at the fork or opening, high-pressure wind is used to clean the floating dust and cuttings on the rock surface at the fork or opening, and the initial spray is carried out on the clean rock surface. After the concrete is solidified, use a drilling machine to drill holes, insert the hollow anchor rod, and make the extension length of the anchor rod less than the thickness of the supporting layer, add a gasket at the tail, screw the nut and then grouting, erect the steel mesh and weld the anchor rod Or tied with wire.

Another construction method in step 4) is to construct a waterproof layer on the surface of the shotcrete layer, use a lining trolley to form a vertical form along the side wall and the arch, pour concrete and tamp it.

The present invention has the following beneficial effects: the present invention provides an arrangement and a construction method of pre-buried holes in a reinforced concrete supporting layer at a tunnel or a roadway fork or opening, where PVC plastic pipes are pre-buried during the tunnel or roadway supporting construction, and when it needs to be opened For fork or opening operation, you only need to find the PVC plastic pipe, and then the blasting operation can be carried out, which avoids the drilling operation in the tunnel or roadway support layer, saves a lot of manpower, material and financial resources, and also avoids the noise pollution generated in the drilling construction. .

The invention arranges pre-embedded holes in a reinforced concrete supporting layer at the fork or opening of a tunnel or a roadway and a construction method, which can easily arrange blast holes in the supporting layer, and the pre-buried holes are arranged in an accurate position, and manual drilling is avoided. Many errors brought about, thereby providing the effect of subsequent blasting, and speeding up the speed of opening forks or openings.

The invention provides an arrangement and a construction method for pre-buried holes in a reinforced concrete supporting layer at a fork or opening of a tunnel or a roadway, which is beneficial to the recycling of reinforced mesh, steel arch and concrete.

The invention avoids the drilling operation and the dust generated by the drilling, and reduces the impact on the environment at the same time.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of a tunnel or roadway with a fork or an open pre-buried hole.

Figure 2 is a schematic cross-sectional view of a tunnel or roadway embedded hole with a lining layer of reinforced concrete. (B-B in Figure 4)

Figure 3 is a schematic cross-sectional view of a tunnel or roadway pre-buried hole where the lining layer is plain concrete. (B-B in Figure 4)

FIG. 4 is a schematic cross-sectional view of a pre-buried hole in a tunnel or a roadway, that is, a view from the direction A-A in FIGS. 2 and 3 .

Fig. 5 is a schematic cross-sectional view of a tunnel or roadway pre-buried hole without a steel arch and the lining layer is reinforced concrete.

Figure 6 is a schematic cross-sectional view of a tunnel or roadway pre-buried hole without a steel arch and the lining layer is plain concrete.

Figure 7 is a schematic diagram of the fixing of the embedded undercut pipe.

Fig. 8 is a schematic diagram of fixing the empty pre-embedded pipe.

Fig. 9 is a schematic diagram showing the fixing of the pre-embedded auxiliary pipe in the outer ring.

Fig. 10 is a schematic diagram of fixing a single pre-embedded auxiliary pipe in the inner ring.

Figure 11 is an auxiliary schematic diagram of the pre-embedded peripheral pipe.

In the figure, pre-embedded hole 1, bolt 2, steel arch 3, steel mesh 4, empty pre-embedded hole 5, pre-embedded undercut hole 6, pre-embedded auxiliary hole 7 in the outer ring, and single pre-embedded auxiliary hole in the inner ring 8 , pre-embedded peripheral hole 9, empty pre-embedded pipe 10, pre-embedded undercut pipe 11, tie wire 12, pre-embedded undercut pipe reinforcement ring 13, outer ring pre-embedded auxiliary pipe 14, inner ring pre-embedded auxiliary pipe 15, pre-buried Buried auxiliary pipe reinforcement ring 16, pre-embedded peripheral pipe 17, pre-embedded peripheral pipe reinforcement ring 18, surface 19 of spray anchor layer, steel reinforcement 20, boundary line 21 of compound spray layer and secondary lining layer.

Detailed ways

DETAILED DESCRIPTION As shown in Figures 1-11, the layout and construction method of the pre-buried holes in the reinforced concrete supporting layer at the switch or opening of the tunnel or roadway include a schematic diagram of the pre-buried hole at the switch or opening of the tunnel or roadway, and the lining layer is reinforced concrete. Schematic diagram of the pre-buried hole in the tunnel or roadway, schematic diagram of the pre-buried hole in the tunnel or roadway with the lining layer of plain concrete, schematic diagram of the pre-buried hole in the tunnel or roadway, without steel arch frame and the lining layer of the tunnel or roadway pre-buried with reinforced concrete Schematic diagram of hole section, schematic diagram of tunnel or roadway pre-buried hole without steel arch frame and lining layer of plain concrete, schematic diagram of pre-buried undercut pipe fixing, schematic diagram of empty pre-buried pipe fixing, outer ring pre-embedded auxiliary pipe fixing schematic diagram, inner ring A schematic diagram of fixing a single pre-embedded auxiliary pipe, and a schematic diagram of the auxiliary pre-embedded peripheral pipe.

Example 1:

A tunnel is designed with a length of 2km, a span of 6m, a wall height of 2m, an arch height of 1.5m, and the thickness of the support layer is 55cm. In the tunnel, a fork or opening is required.

According to above-mentioned tunnel or roadway fork or opening place reinforced concrete supporting layer pre-buried hole arrangement and construction method, the construction process of the present invention is:

1) After excavating the fork or opening of the tunnel or roadway section, use high-pressure wind to blow off the floating dust and cuttings on the rock surface at the fork or opening, drill holes with a drilling machine, insert the hollow bolt 2, and make the anchor The extension length of the rod is less than 5cm of the thickness of the supporting layer, add a gasket at the tail, screw on the nut and then grouting, erect the steel mesh and weld it with the anchor rod or bind it with iron wire, and then spray the anchor with the concrete spray unit, and the thickness of the spray anchor layer is 40mm;

2) At 10cm away from the surface of the shotcrete layer, set up three reinforcement rings welded with the anchor rod, namely, the reinforcement ring 13 of the pre-embedded cutting pipe, the reinforcement ring 16 of the pre-embedded auxiliary pipe, and the reinforcement ring 18 of the pre-embedded peripheral pipe, three steel bars. The shape of the ring is the same as the contour lines of the pre-embedded peripheral holes, pre-embedded auxiliary holes and pre-embedded cut holes designed at the fork or opening, respectively. The diameter of the reinforcement ring is 8mm. The side of the steel arch frame is welded with the anchor rod, and longitudinal connecting ribs are welded on the two adjacent steel arch frames; then a layer of the same steel ring is arranged at a certain distance from the previous layer of steel ring, and the steel ring includes pre-buried undercut pipes. The reinforcement ring 13, the pre-embedded auxiliary pipe reinforcement ring 16, and the pre-embedded peripheral pipe reinforcement ring 18 are welded with the anchor rod 2 so that the planes of the two layers of reinforcement rings are parallel;

3) The pre-embedded pipes are made of PVC plastic pipes. The pre-embedded peripheral pipes, pre-embedded auxiliary pipes and pre-embedded undercut pipes are arranged along the normal direction of the surface of the reinforced concrete supporting layer, with one end extending into the supporting layer and the other end extending to the surface of the support layer. The pre-embedded peripheral pipe and pre-embedded auxiliary pipe shall have a pre-embedded depth of 45cm, a diameter of 50mm and a length of 55cm. The diameter is 50mm, the diameter of the empty pre-embedded pipe is 63mm, and the two ends of the pre-embedded peripheral pipe, the pre-embedded auxiliary pipe, and the pre-embedded undercut pipe are respectively bound on two layers of steel bars with a certain distance with a wire tie. The two ends of the empty pre-embedded pipe are respectively tied with wires and tightened, and the other ends of the wires are tied to the edge of the triangular steel bar respectively. Bundle with three fixed pre-embedded auxiliary pipes, and seal the upper and lower openings of the pre-embedded pipes with plastic bags;

4) The re-sprayed concrete covers the steel arch, and the re-spray thickness is 26cm;

5) Arrange reinforced vertical formwork at the inverted arch to cast concrete. After the final setting, construct a waterproof layer on the surface of the respray layer, then arrange reinforced steel along the side wall and the vault, use a lining trolley to form a vertical form, pour concrete and tamp it. Thickness is 25cm.

Example 2:

A tunnel is designed with a length of 3km, a span of 6.5m, a wall height of 1.9m, an arch height of 1.6m, and a supporting layer thickness of 50cm. Forks or openings are required in the tunnel.

According to above-mentioned tunnel or roadway fork or opening place reinforced concrete supporting layer pre-buried hole arrangement and construction method, the construction process of the present invention is:

1) After excavating the fork or opening of the tunnel or roadway section, use high-pressure air to clean the floating dust and cuttings on the rock surface at the fork or opening. The thickness of the initial shotcrete is 50mm. Insert the hollow anchor rod, and make the extension length of the anchor rod less than 10cm of the thickness of the supporting layer, add a gasket at the tail, screw the nut and then grouting, erect the steel mesh and weld the anchor rod or bind it with iron wire;

2) Set up three reinforcement rings welded to the anchor rod at a distance of 8cm from the surface of the reinforcement mesh to be erected. The shapes of the three reinforcement rings are respectively the same as the pre-embedded peripheral holes, pre-embedded auxiliary holes and pre-embedded holes designed at the fork or opening. The contour lines of the cut holes are the same, and the diameter of the steel ring is 6mm. Steel arches are erected at intervals of 1m in the direction of the vertical tunnel centerline. A layer of the same reinforcement ring is arranged at a certain distance from the first row of reinforcement rings. The reinforcement ring includes the reinforcement ring 13 of the pre-embedded cutting pipe, the reinforcement ring 16 of the pre-embedded auxiliary pipe, and the reinforcement ring 18 of the pre-embedded peripheral pipe. 2 Weld so that the planes of the two layers of steel bars are parallel;

3) The pre-embedded pipes are made of PVC plastic pipes. The pre-embedded peripheral pipes, pre-embedded auxiliary pipes and pre-embedded undercut pipes are arranged along the normal direction of the surface of the reinforced concrete supporting layer, with one end extending into the supporting layer and the other end extending to the surface of the support layer. The pre-embedded peripheral pipes and pre-embedded auxiliary pipes shall have a pre-embedded depth of 40 cm, a diameter of 50 mm and a length of 45 cm. The diameter is 50mm, the diameter of the empty pre-embedded pipe is 63mm, and the two ends of the pre-embedded peripheral pipe, the pre-embedded auxiliary pipe, and the pre-embedded undercut pipe are respectively tied to the steel ring with a certain spacing with wire ties. The two ends of the empty pre-embedded pipe are respectively tied with wires and tightened, and the other ends of the wires are tied to the edge of the triangular steel bar respectively. Bundle with three fixed pre-embedded auxiliary pipes, and seal the upper and lower openings of the pre-embedded pipes with plastic bags;

4) The re-sprayed concrete covers the steel arch, and the re-spray thickness is 25cm;

5) A waterproof layer is constructed on the surface of the compound spray layer, and then the steel bars are arranged along the side wall and the vault, and the lining trolley is used to form the vertical form, and the concrete is poured and tamped, with a thickness of 20cm.

Example 3

A tunnel is designed with a length of 2.5km, a span of 5.5m, a wall height of 2.1m, an arch height of 1.5m, and a supporting layer thickness of 60cm. A fork or opening is required in the tunnel.

1) After excavating the fork or opening of the tunnel or roadway section, use high-pressure wind to blow off the floating dust and cuttings on the rock surface at the fork or opening, drill holes with a drilling machine, insert the hollow bolt 2, and make the anchor The extension length of the rod is less than the thickness of the supporting layer 12cm, add a gasket at the tail, screw on the nut and then grouting, erect the steel mesh 4 and the anchor rod 2 to be fixedly connected, either welding or binding with iron wire can be used, and then the concrete spraying unit sprays Anchor, the thickness of the shotcrete layer is 40mm;

2) Set up three reinforcement rings welded with the anchor rod at a distance of 15cm from the surface of the reinforcement mesh to be erected, namely the reinforcement ring 13 of the pre-embedded cutting pipe, the reinforcement ring of the pre-embedded auxiliary pipe 16, and the reinforcement ring of the pre-embedded peripheral pipe 18. The shapes of each steel ring are the same as the contour lines of the pre-embedded peripheral holes, pre-embedded auxiliary holes and pre-embedded cut holes designed at the fork or opening, and the diameter of the steel ring is 6mm, and then it is separated from the first row of steel rings by a certain distance. And three identical reinforcement rings are arranged 10cm away from the surface of the support layer and welded with the anchor rod;

3) The pre-embedded pipes are made of PVC plastic pipes. The pre-embedded peripheral pipes, pre-embedded auxiliary pipes and pre-embedded undercut pipes are arranged along the normal direction of the surface of the reinforced concrete supporting layer, with one end extending into the supporting layer and the other end extending to the surface of the support layer. The pre-embedded peripheral pipes and pre-embedded auxiliary pipes shall have a pre-embedded depth of 52cm, a diameter of 50mm and a length of 57cm. The diameter is 50mm, the diameter of the empty pre-embedded pipe is 63mm, and the two ends of the pre-embedded peripheral pipe, the pre-embedded auxiliary pipe, and the pre-embedded undercut pipe are respectively tied to the steel ring with a certain spacing with wire ties. The two ends of the empty pre-embedded pipe are respectively tied with wires and tensioned, the other ends of the tied wires are respectively tied to the edge of the steel ring 13 of the embedded undercut pipe, and the two ends of the single pre-embedded auxiliary pipe in the inner ring are tied with the tied wires respectively. , the other end of the tie wire is bound with three fixed pre-embedded auxiliary pipes, and the upper and lower openings of the pre-embedded pipes are sealed with plastic bags;

4) Construct a waterproof layer on the surface of the shotcrete layer, use a lining trolley along the side walls and arches to form the vertical form, pour concrete and tamp it. The thick bottom is 56cm.

In the present invention, the pre-embedded undercut pipe reinforcement ring 13 is triangular, the pre-embedded auxiliary pipe reinforcement ring 16, and the pre-embedded peripheral pipe reinforcement ring 18 have the same cross-sectional shape as the tunnel, the upper part is arc-shaped, and the lower part is rectangular.

Claims (4)

1. An arrangement of pre-embedded holes in reinforced concrete supporting layers at tunnel or roadway forks or openings, characterized in that: the pre-embedded holes (1) are included, and the pre-embedded holes (1) include pre-embedded peripheral holes ( 9), a single pre-embedded auxiliary hole (8) in the inner ring, a pre-embedded auxiliary hole (7) in the outer ring, a pre-embedded undercut hole (6) and an empty pre-buried hole (5); the empty pre-buried hole (5) is located in the pre-buried hole (5). In the area enclosed by the buried undercut hole (6); the length direction of the embedded hole (1) is perpendicular to the surface of the reinforced concrete supporting layer, one end extends to the inside of the supporting layer, and the other end extends to the surface of the supporting layer; The buried peripheral holes (9) are distributed on the contour line of the forks or openings of the tunnel or roadway, and the pre-embedded peripheral holes (9) and the inner ring single pre-embedded auxiliary hole (8) have a depth smaller than the thickness of the supporting layer; (6) The depth of the empty pre-buried hole (5) is the same as the thickness of the supporting layer, and the diameter of the empty pre-buried hole (5) is greater than or equal to other apertures. 2. the construction method of the arrangement mode of a kind of tunnel or roadway switch or the pre-buried hole of reinforced concrete supporting layer at the opening according to claim 1, is characterized in that, comprises the following steps: 1) After the tunnel or roadway section is excavated to the fork or opening, remove the floating dust and cuttings at the fork or opening, and then drill the hole, insert the hollow bolt (2) into the hole, and make the extension length of the bolt less than For the thickness of the support layer, add a gasket at the tail, screw on the nut and then grouting, erect the steel mesh (4) and bind it with the anchor rod (2), and then spray the anchor to form the spray anchor layer; 2) On the surface of the shotcrete layer, erect the reinforcement ring (13) for the pre-embedded undercut pipe, the reinforcement ring (16) for the pre-embedded auxiliary pipe, and the reinforcement ring (18) for the pre-embedded peripheral pipe, which are fixedly connected to the anchor rod (2). The shapes of each steel ring are the same as the contour lines of the pre-embedded peripheral holes (9), pre-embedded auxiliary holes (7) and pre-embedded undercut holes (6) at the fork or opening respectively, and are erected at certain distances in the direction perpendicular to the center line of the tunnel. Steel arch frame (3), and then arrange a layer of the same reinforcing steel ring at a certain distance from the previous layer of reinforcing steel ring. The reinforcement ring (18) of the peripheral pipe is embedded in advance and welded with the anchor rod (2), so that the planes of the two layers of reinforcement rings are parallel; 3) Arrange the pre-embedded peripheral pipe (17), the outer ring pre-embedded auxiliary pipe (14) and the pre-embedded undercut pipe (11) perpendicular to the surface of the reinforced concrete supporting layer, with one end extending into the supporting layer and the other end extending To the surface of the supporting layer, the pre-embedded depth of the pre-embedded peripheral pipes (17) and the pre-embedded auxiliary pipes (14) is less than the thickness of the supporting layer, and the pre-embedded depth of the pre-embedded cutting pipes (11) is the thickness of the supporting layer, and the The wire ties (12) bind the pre-embedded peripheral pipe (17), the pre-embedded auxiliary pipe (14) in the outer ring, and the pre-embedded undercut pipe (11) on the two-layer reinforcement rings with a certain interval in turn; The two ends of the buried pipe (10) are respectively bundled and tensioned with the wire (12), and the other end of the wire (12) is tied vertically on the edge of the steel ring (13) of the pre-embedded cutting pipe, and a single inner ring is pre-buried Two ends of the auxiliary pipe (15) are respectively tied with tie wires, the other end of the tie wire is bound with the three fixed outer ring pre-embedded auxiliary pipes (14), and all the pre-embedded pipes are sealed with plastic films at their upper and lower openings; 4) Spray concrete again to completely cover the steel arch (3) to form a re-spray layer; 5) Construct a waterproof layer on the surface of the compound spray layer, arrange steel bars (20) along the side walls and arches, use a lining trolley to form a vertical form, pour concrete and tamp it. 3. the construction method of a kind of reinforced concrete supporting tunnel according to claim 1 or the arrangement of roadway fork or opening pre-buried hole, is characterized in that, comprises the following steps: 1) After the tunnel or roadway section is excavated to the fork or opening, remove the floating dust and cuttings at the fork or opening, and then drill the hole, insert the hollow bolt (2) into the hole, and make the extension length of the bolt less than For the thickness of the support layer, add a gasket at the tail, screw on the nut and then grouting, erect the steel mesh (4) and bind it with the anchor rod (2), and then spray the anchor to form the spray anchor layer; 2) On the surface of the shotcrete layer, erect the reinforcement ring (13) for the pre-embedded undercut pipe, the reinforcement ring (16) for the pre-embedded auxiliary pipe, and the reinforcement ring (18) for the pre-embedded peripheral pipe, which are fixedly connected to the anchor rod (2). The shapes of each steel ring are the same as the contour lines of the pre-embedded peripheral holes (9), pre-embedded auxiliary holes (7), and pre-embedded undercut holes (6) at the fork or opening, respectively, and are erected at certain distances in the direction perpendicular to the center line of the tunnel. Steel arch frame (3), and then three identical reinforcement rings (13), pre-embedded auxiliary pipe reinforcement rings (16) and pre-embedded peripheral pipe reinforcement rings (18) previously arranged at a certain distance The reinforcement ring (13) of the pre-embedded cutting pipe, the reinforcement ring (16) of the fixed pre-embedded auxiliary pipe, the reinforcement ring (18) of the pre-embedded peripheral pipe, and the reinforcement ring and the anchor rod (2) are fixedly connected; 3) Arrange the pre-embedded peripheral pipe (17), the outer ring pre-embedded auxiliary pipe (14) and the pre-embedded undercut pipe (11) perpendicular to the surface of the reinforced concrete supporting layer, with one end extending into the supporting layer and the other end extending To the surface of the supporting layer, the pre-embedded depth of the pre-embedded peripheral pipes (17) and the pre-embedded auxiliary pipes (14) is less than the thickness of the supporting layer, and the pre-embedded depth of the pre-embedded cutting pipes (11) is the thickness of the supporting layer, and the The wire tie (12) binds the pre-embedded peripheral pipe (17), the outer ring pre-embedded auxiliary pipe (14), and the pre-embedded undercut pipe (11) on the steel ring with a certain interval in turn; the empty pre-embedded pipe The two ends of (10) are respectively bundled and tightened with the tie wire (12), and the other end of the tie wire (12) is bound vertically on the edge of the reinforcement ring (13) of the pre-embedded undercut pipe, and a single inner ring is pre-embedded with an auxiliary pipe. The two ends of (15) are tied with tie wires respectively, and the other end of the tie wires is bound with the three fixed outer ring pre-embedded auxiliary pipes (14), and all the pre-embedded pipes are sealed with plastic films at their upper and lower openings; 4) A waterproof layer is constructed on the surface of the shotcrete layer, and then the steel bars (20) are arranged along the side wall and the arch, and the lining trolley is used to form the vertical form, and the concrete is poured and compacted. 4. A construction method for the arrangement of reinforced concrete supporting tunnels or roadways fork or opening pre-buried holes according to claim 2 or 3, characterized in that: step 1) there is another construction method, tunnel or After excavating the fork or opening of the roadway section, blow the dust and debris on the rock surface with high-pressure air at the fork or opening, and spray concrete on the clean rock surface. After the concrete is thick and solidified, use a drilling machine to drill holes , insert the hollow anchor rod (2), and make the extension length of the anchor rod less than the thickness of the supporting layer, add a gasket at the tail, screw on the nut and then grouting, and erect the steel mesh (4) and the anchor rod (2) by welding or Tie with wire.