CN218439380U - Safety protection structure for tunnel entering in piled crushing body - Google Patents
Safety protection structure for tunnel entering in piled crushing body Download PDFInfo
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- CN218439380U CN218439380U CN202122834438.8U CN202122834438U CN218439380U CN 218439380 U CN218439380 U CN 218439380U CN 202122834438 U CN202122834438 U CN 202122834438U CN 218439380 U CN218439380 U CN 218439380U
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Abstract
The utility model discloses a pile up safety protection structure that tunnel advances hole in crushing body, include: open cut tunnel structure and reinforced structure, the open cut tunnel structure sets up outside the tunnel entrance to a cave, and it includes: at least four steel arches, a plurality of steel arches being arranged at intervals along a first direction; a steel plate connected to a circumferential outer side surface of the steel arch; the reinforcing structure is arranged on the uphill slope surface above the tunnel portal, is connected with the open cut tunnel structure and is used for reinforcing the accumulation crushing body of the uphill slope surface above the tunnel portal; the tunnel portal is protected by the open cut tunnel structure, so that the operators and the machinery can safely enter the tunnel, the open cut tunnel structure consisting of the steel arch frames and the steel plates is quick to construct, firm in structure and convenient to construct, the construction period can be saved better, and the entering construction is not delayed; set up reinforced structure on the uphill slope surface of tunnel entrance to a cave top simultaneously and consolidate the broken body, avoid the broken body to collapse, influence the construction of entrance to a cave department, the safety of assurance staff construction that can be better to realized that the zero excavation of uphill advances the hole, reduce the influence to all ring edge borders.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, specifically be a pile up safety protection structure that tunnel entered hole in the body that smashes.
Background
When the tunnel portal section is in the piled up crushing body, the construction of the portal of the tunnel entering the tunnel is difficult. In order to ensure that the crushed body does not collapse, various pre-consolidation treatment measures need to be taken. The time and energy are wasted when the hole is pre-reinforced in advance by brushing the slope, and sometimes the hole cannot be drilled in late season in rainy season, so that the construction period is seriously influenced; and side and upward slopes are excavated at the broken rock mass, so that the slope accumulation of the broken rock mass at the cave entrance is cleaned, and certain danger is also caused. In this case, how to ensure safe, economical and convenient method is worth further research.
The existing construction method usually adopts the steps of constructing a protective arch outside a hole opening, matching a long pipe shed to protect an arch crown from the hole opening to the inside of the hole, and then tunneling a hole opening section. The method can ensure safety, but the construction of the long pipe shed in the piled crushing body is time-consuming and labor-consuming, and the manufacturing cost is higher. In addition, a small pilot tunnel is adopted to tunnel a section of the tunnel, after a better rock mass is reached, the section is enlarged, and after proper support, the construction is stably tunneled to the large section in the direction of the tunnel opening. However, the construction method is complex in construction process and slow in construction progress.
The hole upward slope is naturally formed for thousands of years, and the slope angle is the natural repose angle. Once it is excavated, the slope is changed, breaking its balance and allowing the rock mass or heap to collapse or slide. Therefore, it is a key point to keep the mountain stable without changing the slope of the upward slope, i.e. without brushing the slope. The method inevitably cleans the uphill slope to a certain extent, causes certain scratching to the piled crushing body, is not beneficial to the stabilization of the uphill slope of the hole, also causes certain influence to the ecological environment of the hole, and is not in accordance with the current concept of harmonious development of people and nature.
The Chinese patent with publication number CN112879035A discloses a tunnel open cut tunnel structure, which comprises a fender pile group, a crown beam, a bearing arch and a first side wall. The system comprises a tunnel, a plurality of enclosure pile groups and a plurality of prestressed beams, wherein each enclosure pile group comprises two enclosure piles and a transverse prestressed beam; the two crown beams are respectively arranged on the fender posts on the two sides of the tunnel and are fixedly connected with the fender posts; the bearing arch is arranged above the crown beams and is arc-shaped, and two ends of the bearing arch are respectively connected with the crown beams at two ends of the tunnel. The bottom of the first side wall is connected with the two ends of the inverted arch respectively. The invention utilizes the bearing arch to downwards transmit the load of the soil mass above the open cut tunnel to the fender post, and the fender post, the prestressed beam and the crown beam are jointly used for bearing.
The tunnel structure is not suitable for construction safety protection of the tunnel entrance section in the piled up crushing body as a permanent open cut tunnel structure, and tunnel entrance construction is still difficult.
Disclosure of Invention
The utility model aims at providing a pile up the safety protection structure that tunnel entered hole in the broken body, solved current tunnel entrance to a cave section when in piling up the broken body, the tunnel enters the more difficult problem of entrance to a cave construction in hole.
In order to achieve the above object, the utility model adopts the following technical scheme:
a safety shield structure for tunneling in a stacked fragmentation body, comprising:
open cut tunnel structure and reinforced structure, the open cut tunnel structure sets up outside the tunnel entrance to a cave, and it includes:
at least four steel arches, a plurality of steel arches being arranged at intervals along a first direction;
a steel plate connected to a circumferential outer side surface of the steel arch;
the reinforcing structure is arranged on the upward slope surface above the tunnel portal and is structurally connected with the open cut tunnel for reinforcing the accumulation crushing body on the upward slope surface above the tunnel portal.
The open cut tunnel structure protects the tunnel portal so that workers can safely enter the tunnel, and the open cut tunnel structure consisting of the steel arch frames and the steel plates is fast in construction and firm in structure in the construction stage, can better save the construction period and does not delay the entering construction; set up reinforced structure on the domatic of tunnel entrance to a cave top simultaneously and consolidate the broken body, avoid the broken body to collapse, influence the construction of entrance to a cave department, the safety of assurance staff's construction that can be better.
Furthermore, a plurality of connecting ribs are arranged between every two adjacent steel arches and used for connecting the two adjacent steel arches, so that the plurality of steel arches are connected into a whole, the strength of the open cut tunnel structure is improved, and better safety guarantee can be provided.
Furthermore, along adjacent two on the first direction the splice bar dislocation set makes the steel bow member atress more even, and the structure is more stable.
Specifically, the reinforced structure includes mortar stock, steel flower tube anchor pile and reinforcing bar net, the mortar stock with steel flower tube anchor pile all sets up in the slope body of tunnel entrance to a cave top along vertical direction, reinforcing bar net is laid the mortar stock with steel flower tube anchor pile top, and with the mortar stock with the top of steel flower tube anchor pile all is connected, the edge of reinforcing bar net with the edge connection of steel sheet, the broken body of the slope body is consolidated through the mortar stock that sets up and steel flower tube anchor pile, does not disturb the domatic of tunnel entrance to a cave top basically, does not change domatic angle, and rethread reinforcing bar net connects mortar stock and steel flower tube anchor pile into a whole, further consolidates the broken body of the slope body, has guaranteed the overall stability of slope body structure, reduces effectively and the safe risk of tunnel entrance to a cave construction.
Furthermore, the mortar anchor rod and the steel flower tube anchor pile are both arranged in a quincunx shape, so that the reinforcing effect is better.
Further, the steel plate and the upper surface of the steel bar net are provided with sprayed concrete layers, the steel plate and the sprayed concrete layers on the upper surface of the steel bar net are connected into a whole, and the slope surface and the open cut tunnel are further reinforced.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) The tunnel portal is protected by the open cut tunnel structure, so that the operators and the machinery can safely enter the tunnel, the open cut tunnel structure consisting of the steel arch frames and the steel plates is quick to construct, firm in structure and convenient to construct, the construction period can be saved better, and the entering construction is not delayed; set up reinforced structure on the uphill slope surface of tunnel entrance to a cave top simultaneously and consolidate the breaker, avoid the breaker to collapse, influence the construction of entrance to a cave department, the safety of assurance staff construction that can be better.
(2) The broken body of the slope body is consolidated through the mortar anchor rod and the steel perforated pipe anchor pile that set up, do not disturb the domatic of tunnel entrance to a cave top basically, do not change domatic angle, rethread reinforcing bar net links into a whole with mortar anchor rod and steel perforated pipe anchor pile, further consolidate the broken body of the slope body, the overall stability of slope body structure has been guaranteed, effectively reduce the safety risk with the construction of tunnel entrance to a cave, realized the zero excavation of adverse slope and advanced the hole, reduce and influence all around the environment.
(3) The utility model discloses construction preparation work is less, and construction process is simple, can guarantee the faster hole of advancing in tunnel, is a safe, economy, convenient broken body tunnel entrance to a cave mode of piling up.
(4) The utility model discloses original landform and natural landscape have basically been kept, can combine peripheral natural environment to carry out the afforestation view setting, have embodied the theory of harmonious development of people and nature.
(5) The utility model discloses an outer open cut tunnel structure in tunnel portal can regard as the scaffold frame of slope body reinforcement construction in the construction, can solve the problem that needs set up the platform when the construction is consolidated to the portal slope body.
Drawings
FIG. 1 is a schematic view of the structure of the tunnel entrance safety protection structure in the pile-up breaker of the present invention;
FIG. 2 is another schematic structural view of the tunnel entrance safety protection structure of the present invention;
in the figure: 1. a steel arch frame; 2. a steel plate; 3. connecting ribs; 4. a mortar anchor rod; 5. anchor piles of steel perforated pipes; 6. and (5) spraying a concrete layer.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 and 2, the present embodiment provides a safety protection structure for a tunnel entrance hole in a stacked crushing body, comprising:
open cut tunnel structure and reinforced structure, the open cut tunnel structure sets up outside the tunnel entrance to a cave, and it includes:
5 steel arches 1,5 steel arches 1 are arranged at intervals along a first direction, the first direction is the longitudinal direction of the tunnel, the interval between adjacent steel arches 1 is 1m, the steel arch 1 closest to the tunnel portal is tightly abutted to a slope body at the tunnel portal, and the steel arch 1 is an I20 steel arch 1;
the steel plate 2 is welded on the outer side surface of the steel arch frame 1 in the circumferential direction, and the thickness of the steel plate is 2-3 mm;
the outer contour of the steel arch frame 1 is the same as the inner contour of the tunnel excavation, and the steel arch frame 1 is a large half-section (the foot of the steel arch frame 1 is 1m below the foot of the tunnel arch), a shallow bar-shaped step-shaped pit slot can be excavated in advance on the foot of the steel arch frame 1, if the bearing capacity of the base does not meet the requirement, the concrete is poured in the pit slot to form an extended foundation, so as to ensure the integral stability of the steel arch frame 1, the open cut tunnel structure is a temporary open cut tunnel structure, and can be used as an open cut tunnel steel bar structure to be completely wrapped in a formal opening concrete open cut tunnel structure;
the reinforcing structure is arranged on the upward slope surface above the tunnel portal and is structurally connected with the open cut tunnel for reinforcing the accumulation crushing body on the upward slope surface above the tunnel portal.
The open cut tunnel structure protects the tunnel portal so that workers can safely enter the tunnel, and the open cut tunnel structure consisting of the steel arch frames 1 and the steel plates 2 is fast to construct and firm in structure in the construction stage, can better save the construction period and does not delay the entering construction; set up reinforced structure on the domatic of tunnel entrance to a cave top simultaneously and consolidate the broken body, avoid the broken body to collapse, influence the construction of entrance to a cave department, the safety of assurance staff's construction that can be better.
Furthermore, a plurality of connecting ribs 3 are welded between every two adjacent steel arches 1 and used for connecting the two adjacent steel arches 1, so that the steel arches 1 are connected into a whole, the strength of the open cut tunnel structure is improved, and better safety guarantee can be provided, and the connecting ribs 3 are reinforcing steel bars and have the diameter of 22mm.
Further, along adjacent two on the first direction 3 dislocation sets of splice bar makes steel bow member 1 atress more even, and the structure is more stable.
Specifically, the reinforced structure comprises a mortar anchor rod 4, steel flower pipe anchor piles 5 and a reinforcing mesh, wherein the mortar anchor rod 4 and the steel flower pipe anchor piles 5 are arranged in a slope body above a tunnel opening along the vertical direction, the slope surface of the opening section is not brushed, the steel flower pipe anchor piles 5 are arranged in the range of 1-3m outside the longitudinal and transverse tunnel contour line of the tunnel on the original slope surface, the steel flower pipe anchor piles 5 are steel flower pipes with the diameter of 50mm, the wall thickness of the steel flower pipe anchor piles is 5mm, small holes with the diameter of 8mm are drilled on the pipe wall of the steel flower pipe anchor piles, the space is 15 cm, cement slurry is poured into the pipe, the pile distance is 3.6m, and quincunx type arrangement is realized; the diameter of the mortar anchor rod 4 is 20mm, the length of the mortar anchor rod is 2.5m, the distance between the mortar anchor rods is 1.2m, the mortar anchor rod is arranged in a quincunx mode, and the mortar anchor rod is vertically downward; the reinforcing mesh is laid above the mortar anchor rod 4 and the steel perforated pipe anchor pile 5, and is welded with the tops of the mortar anchor rod 4 and the steel perforated pipe anchor pile 5, the edge of the reinforcing mesh is also welded with the edge of the steel plate 2, the diameter of the reinforcing mesh is phi 6-phi 8mm, the distance is 200mm, and the reinforcing mesh is vertically and horizontally arranged in a crossed manner; the broken body of the slope body is reinforced through the mortar anchor rod 4 and the steel perforated pipe anchor pile 5 which are arranged, the slope surface above the tunnel portal is basically not disturbed, the slope surface angle is not changed, the mortar anchor rod 4 and the steel perforated pipe anchor pile 5 are connected into a whole through the reinforcing mesh, the broken body of the slope body is further reinforced, the overall stability of the slope body structure is guaranteed, and the safety risk of construction with the tunnel portal is effectively reduced.
Further, the steel plate 2 and the upper surface of the steel bar net are provided with sprayed concrete layers 6, the steel plate 2 and the sprayed concrete layers 6 on the upper surface of the steel bar net are connected into a whole to further reinforce the slope and the open cut tunnel, the sprayed concrete layers 6 are C25 sprayed concrete, and the range of the sprayed concrete layers 6 is an area which is 6m-10m from the tunnel portal to two sides and on the slope.
Furthermore, after the tunnel is tunneled into a stable rock stratum, the open cut tunnel structure can be further constructed to be a permanent open cut tunnel and tunnel portal structure, planting soil is filled back above the open cut tunnel and the upward slope, greening landscape setting is carried out by combining the surrounding natural environment, the opening building is beautified, the opening building and the surrounding environment are integrated, and harmonious development of people and nature is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A safety protection structure for a tunnel entering hole in a piled crushing body is characterized by comprising:
open cut tunnel structure and reinforced structure, the open cut tunnel structure sets up outside the tunnel entrance to a cave, and it includes:
at least four steel arches, wherein the steel arches are arranged at intervals along a first direction;
a steel plate connected to a circumferential outer side surface of the steel arch;
the reinforced structure is arranged on the slope surface of the upward slope above the tunnel portal and is structurally connected with the open cut tunnel for reinforcing the accumulated crushed bodies on the slope surface of the upward slope above the tunnel portal.
2. A safety structure for a tunnel boring in an accumulation crusher as claimed in claim 1, wherein a plurality of connecting ribs are provided between adjacent said steel arches for connecting two adjacent said steel arches.
3. A safety shield structure for a tunnel boring in a stacked breaker body according to claim 2, wherein two of said tie bars adjacent to each other in the first direction are disposed in a staggered manner.
4. A safety shield structure for a tunnel boring in an accumulation crusher as claimed in claim 1, wherein said reinforcing structure comprises a mortar anchor bar, a steel spline pipe anchor pile and a reinforcing mesh, said mortar anchor bar and said steel spline pipe anchor pile are vertically disposed in a slope above the tunnel opening, said reinforcing mesh is laid over said mortar anchor bar and said steel spline pipe anchor pile and is connected to the top of said mortar anchor bar and said steel spline pipe anchor pile, and the edge of said reinforcing mesh is connected to the edge of said steel plate.
5. The safety protection structure for a tunnel entrance in an accumulation crusher according to claim 4, wherein the mortar anchor rod and the steel tube anchor pile are disposed in a quincunx shape.
6. A safety shield structure for a tunnel boring in a piled up crusher as claimed in claim 4, wherein said steel plate and said reinforcing mesh are provided with a sprayed concrete layer on the upper surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122834438.8U CN218439380U (en) | 2021-11-18 | 2021-11-18 | Safety protection structure for tunnel entering in piled crushing body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122834438.8U CN218439380U (en) | 2021-11-18 | 2021-11-18 | Safety protection structure for tunnel entering in piled crushing body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218439380U true CN218439380U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122834438.8U Active CN218439380U (en) | 2021-11-18 | 2021-11-18 | Safety protection structure for tunnel entering in piled crushing body |
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| Country | Link |
|---|---|
| CN (1) | CN218439380U (en) |
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2021
- 2021-11-18 CN CN202122834438.8U patent/CN218439380U/en active Active
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