CN111594233A - Filling-free steel frame support subsection excavation construction method for tunnel lower-partition-free partition wall - Google Patents
Filling-free steel frame support subsection excavation construction method for tunnel lower-partition-free partition wall Download PDFInfo
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- CN111594233A CN111594233A CN202010632925.3A CN202010632925A CN111594233A CN 111594233 A CN111594233 A CN 111594233A CN 202010632925 A CN202010632925 A CN 202010632925A CN 111594233 A CN111594233 A CN 111594233A
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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
- E21D11/14—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
- 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
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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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
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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
Abstract
The invention discloses a filling-free steel frame support subsection excavation construction method for a tunnel without a lower partition wall, which is characterized in that a step method is used as a basis, the step method is combined with a CRD method to form an improved CRD method, namely, an upper step is constructed by the CRD method, the upper step of the tunnel is divided into a left subsection and a right subsection for successive excavation support by constructing an intermediate partition wall and a temporary inverted arch, specifically, a hammer-shaped steel frame for the intermediate partition wall is formed by adopting an intermediate partition wall steel frame and an inverted arch steel frame of the upper step part, and a temporary support system is constructed together with the other inverted arch steel frames of the upper step to reduce the span of the upper step of the tunnel, wherein the intermediate partition wall and the temporary inverted arch of the tunnel are only supported by adopting the temporary steel frame; the lower step still adopts left and right subsection excavation support, but does not need to be executed and do the interim support of intermediate wall. The method greatly reduces the influence of surrounding rocks on the tunnel structure in the soft rock stratum after the primary support is finished and before the inverted arch construction.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a soft rock tunnel partial excavation construction method without a lower partition wall and a filling-free steel frame support.
Background
With the rapid development of highway construction in China, weak surrounding rock tunnels are more and more common. After the tunnel is excavated, the ground stress is redistributed. Because the soft rock has low strength and is extremely sensitive to engineering disturbance, a plastic zone is generated under the condition of tension or compression, and surrounding rocks and supports are deformed. Once the construction method and measures are improper, engineering disasters such as primary support limit invasion or tunnel collapse are easy to happen. The construction progress is influenced and the construction cost is increased if the safety is low, and a large safety accident occurs if the safety is high. Therefore, the construction method and the supporting means are adopted to deal with the soft rock tunnel construction, so that the construction cost can be effectively controlled, the construction progress is accelerated, the safety risk is greatly reduced, and the construction safety is ensured.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a filling-free steel frame support excavation construction method for a non-lower partition wall of a tunnel.
The invention is realized in this way, construct a tunnel and have no lower partition wall to exempt from to fill the steel frame and strut the subsection excavation construction method, characterized by that; the method comprises the steps of combining the step method with a CRD (cross intermediate partition wall) method to form an improved CRD method, namely constructing an upper step by the CRD method, dividing the upper step of a tunnel into a left part and a right part by sequentially excavating and supporting through constructing an intermediate wall and a temporary inverted arch, specifically forming an intermediate wall hammer-shaped steel frame by using an intermediate wall steel frame and an upper step inverted arch steel frame and constructing a temporary supporting system together with the other inverted arches of the upper step to reduce the span of the upper step of the tunnel, wherein the intermediate wall and the temporary inverted arch of the tunnel are supported by using the temporary steel frame without filling injection concrete; the lower step still adopts left and right subsection excavation support, but does not need to be executed and do the interim support of intermediate wall. The method greatly reduces the influence of surrounding rocks on the tunnel structure in the soft rock stratum after the primary support is finished and before the inverted arch construction. The realization process is as follows;
1) designing and processing an intermediate wall and a temporary inverted arch supporting structure; and designing the intermediate wall and the temporary inverted arch I-shaped steel frame according to the excavation height of the upper step, and processing and manufacturing the connecting steel plate by referring to the joint of the primary support steel arch frame. Wherein the hammer-shaped steel frame of the intermediate wall is designed and processed according to the following method; dividing the temporary inverted arch steel frame of the upper left step into two units, wherein the length of the unit on the right side is 1.2m, welding the two units with the steel frame of the intermediate wall through a connecting steel plate to form a hammer-shaped steel frame, and additionally arranging the hammer-shaped steel frame at the intersection of the intermediate wall and the temporary inverted arch
200mm triangle-shaped stiffening steel plate, steel sheet thickness 20mm to avoid mid-board to pass down stress too concentrated, make its atress more even, the structure is more stable. When the left lower step is excavated in a subsection mode, the hammer-shaped steel frame is not detached temporarily, and the hammer-shaped steel frame and the temporary inverted arch steel frame on the side of the right upper step share and transmit the upper load together before the excavation of the right lower step.
2) After the advanced support is constructed, excavating the left upper step of the tunnel face according to an improved CRD method, wherein the excavating distance is not more than 2 trusses of arch frames each time, and after the excavation, constructing a left arch steel frame anchor-spraying support, a hammer-shaped steel frame and a left upper step temporary inverted arch steel frame in time, wherein the left arch steel frame anchor-spraying support, the hammer-shaped steel frame and the left upper step temporary inverted arch steel frame are connected in pairs, so that the steel frame support of the left upper step is.
3) And after the right upper step is excavated, a right arch steel frame anchor-spraying support and a right upper step temporary inverted arch steel frame are constructed in time and are connected with the hammer-shaped steel frame, so that the steel frame support of the right upper step is closed into a ring.
4) Before excavating the left lower step, the temporary inverted arch steel frame of the left upper step except the occupied part of the hammer-shaped steel frame is firstly dismantled, and then the left lower step is excavated by taking the distance of not less than 30cm from the end of the hammer-shaped steel frame as the top edge. And (3) the hammer-shaped steel frame of the intermediate wall is ensured to be stable in the process of dismantling the temporary inverted arch and excavating, and the side wall steel frame anchor-spraying support of the left lower step is constructed in time after the excavation is finished. And the lower step is excavated, and the number of arch frames is not more than 5 each time.
5) Before the excavation of the right lower step, firstly removing the hammer-shaped steel frame of the middle partition wall and the temporary inverted arch of the right upper step, then excavating the right lower step, and timely constructing the anchor-spraying support of the side wall steel frame of the right lower step after the excavation is finished.
6) The inverted arch excavation is not more than 6m each time, after the excavation is finished, inverted arch steel arch frames are installed in time, concrete is sprayed, the tunnel is closed to form a ring, and inverted arches and subsequent engineering are constructed in time.
The invention relates to a tunnel non-lower partition filling-free steel frame support subsection excavation construction method which is characterized in that a steel frame support is arranged in a tunnel non-lower partition filling-free steel frame support; in the step 1), the intermediate wall and temporary inverted arch supporting structure comprises an intermediate wall hammer-shaped steel frame and a temporary inverted arch steel frame.
The invention relates to a tunnel non-lower partition filling-free steel frame support subsection excavation construction method which is characterized in that a steel frame support is arranged in a tunnel non-lower partition filling-free steel frame support; the temporary inverted arch steel frame is divided into a left upper step temporary inverted arch steel frame and a right upper step temporary inverted arch steel frame. The left upper step temporary inverted arch steel frame is divided into two units, the length of the right unit is 1.2m and is welded with the middle partition wall steel frame to form a hammer-shaped steel frame, and the remaining part is a left unit.
The invention relates to a tunnel non-lower partition filling-free steel frame support subsection excavation construction method which is characterized in that a steel frame support is arranged in a tunnel non-lower partition filling-free steel frame support; in the step 1), the middle partition wall hammer-shaped steel frame is composed of a right unit of the temporary inverted arch steel frame with the upper left step and a middle partition wall steel frame. The steel plates are welded to form a hammer-shaped steel frame, a 200 mm-200 mm triangular stiffening steel plate is additionally arranged at the intersection of the intermediate wall and the temporary inverted arch on the hammer-shaped steel frame, and the thickness of the steel plate is 20 mm.
The invention relates to a tunnel non-lower partition filling-free steel frame support subsection excavation construction method which is characterized in that a steel frame support is arranged in a tunnel non-lower partition filling-free steel frame support; and connecting steel plates and bolts are adopted for connection between the hammer-shaped steel frame of the intermediate wall and the temporary inverted arch steel frame of the upper step, between the hammer-shaped steel frame of the intermediate wall and the tunnel arch steel frame and between the temporary inverted arch steel frame of the upper step and the tunnel arch steel frame, and the size of each connecting steel plate is 300 multiplied by 16 mm.
The invention has the following advantages: the method is based on a step method and can be regarded as the combination of the step method and the CRD method. The upper step is a CRD construction section, and the upper step of the tunnel is divided into a left part and a right part for construction through constructing an intermediate wall and a temporary inverted arch, so that the span of the upper step of the tunnel is reduced; the lower step is still excavated in left and right parts without temporary support of the intermediate wall. By adopting the technology, the influence of surrounding rocks on the structure of the soft rock tunnel after the primary support is finished and before the inverted arch construction is greatly reduced. The method has the following characteristics: (1) compared with a step method, the construction method can effectively control initial convergence deformation of the soft rock tunnel in a time period after initial support is finished and before inverted arch construction, and avoids the risk of arch replacement due to invasion limit caused by large convergence deformation. (2) Compared with the CRD method, the construction method does not need to arrange the lower step intermediate wall, the upper step temporary inverted arch and the intermediate wall are supported by steel frames, and the injection concrete is not filled, so that the construction steps are reduced. (3) The construction method is characterized in that the mid-wall steel frame and the upper step inverted arch steel frame are integrally connected to form a hammer-shaped steel frame of the mid-wall, and stress concentration of the foot of the mid-wall steel frame during excavation of the lower step is reduced. (4) The temporary support steel frame without filling concrete is convenient to install and dismantle, can be repeatedly used and is more economical. (5) The support parameters can be adjusted in time according to the change of the surrounding rock and the analysis of the monitoring and measuring data, and the operation flexibility is strong.
Drawings
FIG. 1 is a flow chart of a process of excavation construction of a filling-free steel frame support subsection of a non-lower partition wall of a tunnel;
FIG. 2 is a schematic diagram of a modified CRD process;
FIG. 3 is a schematic view of a hammer-shaped steel frame of the mid-partition;
FIG. 4 is a schematic diagram of a temporary inverted arch steel frame of a left unit of a left upper step;
FIG. 5 is a schematic view of a temporary inverted arch steel frame for an upper right step;
FIG. 6 is a schematic view of the connection between the temporary inverted arch steel frame of the upper step and the tunnel arch connector;
FIG. 7 is a schematic view of the connection between the hammer-shaped steel frame of the intermediate wall and the tunnel arch;
FIG. 8 is a schematic view of the connection between the hammer-shaped steel frame of the intermediate wall and the temporary inverted arch steel frame of the upper step.
Wherein: the device comprises an intermediate wall hammer-shaped steel frame 1, an upper step temporary inverted arch steel frame, an intermediate wall steel frame 101, a left upper step right side unit temporary inverted arch steel frame 102, a triangular stiffening steel plate 103, an upper step temporary inverted arch steel frame 2, an upper step left side unit temporary inverted arch steel frame 201, a right upper step temporary inverted arch steel frame 202, a connecting steel plate 4, a tunnel arch steel frame 5, a left arch steel frame anchor-spray support 501, a right arch steel frame anchor-spray support 502, bolts 6, a left upper step 11, a right upper step 12, a left lower step 13, a left lower step side wall steel frame anchor-spray support 14, a right lower step 15, a right lower step side wall steel frame anchor-spray support 16 and an inverted arch steel arch frame and a spray concrete 17.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 7, and the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a filling-free steel frame support subsection excavation construction method for a tunnel without a lower partition wall by improvement; the method is suitable for excavation and primary support of the weak surrounding rock tunnel, and can greatly reduce the influence of surrounding rocks on the structure of the soft rock tunnel after the primary support is completed and before inverted arch construction. The method has the following characteristics:
(1) compared with a step method, the construction method can effectively control initial convergence deformation of the soft rock tunnel in a time period after initial support is finished and before inverted arch construction, and avoids the risk of arch replacement due to invasion limit caused by large convergence deformation.
(2) Compared with the CRD method, the construction method does not need to arrange the lower step intermediate wall, the upper step temporary inverted arch and the intermediate wall are supported by steel frames, and the injection concrete is not filled, so that the construction steps are reduced.
(3) The construction method is characterized in that the mid-wall steel frame and the upper step inverted arch steel frame are integrally connected to form a hammer-shaped steel frame of the mid-wall, and stress concentration of the foot of the mid-wall steel frame during excavation of the lower step is reduced.
(4) The temporary support steel frame without filling concrete is convenient to install and dismantle, can be repeatedly used and is more economical.
(5) The support parameters can be adjusted in time according to the change of the surrounding rock and the analysis of the monitoring and measuring data, and the operation flexibility is strong.
The process principle is as follows: based on an improved soft surrounding rock stratum CRD method, the step method is used as a basis, the step method is combined with the CRD method to form the improved CRD method, namely, an upper step is constructed by the CRD method, the tunnel upper step is divided into a left part and a right part for successive excavation support by constructing an intermediate wall and a temporary inverted arch, specifically, an intermediate wall hammer-shaped steel frame is formed by an intermediate wall steel frame and an inverted arch steel frame of the upper step part, and a temporary support system is constructed together with the rest inverted arch steel frames of the upper step to reduce the span of the tunnel upper step, wherein the tunnel intermediate wall and the temporary inverted arch are only supported by the temporary steel frame without filling injection concrete; the lower step still adopts left and right subsection excavation support, but does not need to be executed and do the interim support of intermediate wall. The method greatly reduces the influence of surrounding rocks on the tunnel structure in the soft rock stratum after the primary support is finished and before the inverted arch construction.
For the structural design of the improved CRD method of the invention;
1) the temporary support of the middle partition wall of the lower step is cancelled;
2) the temporary steel frame support does not need to be filled with sprayed concrete;
3) the temporary inverted arch steel frame on the left side of the upper step is divided into two units, the length of the unit on the right side is 1.2m, the two units and the middle partition wall steel frame are welded to form a whole, and the left unit is remained. When the left lower step is excavated, the steel frame unit is not detached temporarily, and the steel frame unit and the temporary inverted arch steel frame on the right side of the upper step bear and transmit the upper load together before the excavation of the right area of the lower step.
The construction process flow is as follows; left upper step excavation 11 → left upper step arch steel arch and anchor shotcrete support 501 → middle partition hammer-shaped steel frame support 1 → left upper step left side unit temporary inverted arch steel frame support 201 → right upper step excavation 12 → right upper step arch steel arch and anchor shotcrete support 502 → right upper step temporary inverted arch steel frame support 202 → left upper step left side unit temporary inverted arch steel frame 201 is removed → left lower step excavation 13 → left lower step side wall steel arch and anchor shotcrete support 14 → middle partition hammer-shaped steel frame 1 is removed → right upper step temporary inverted arch steel frame 202 is removed → right lower step excavation 15 → right lower step side wall steel arch and anchor shotcrete support 16 → inverted arch and steel frame shotcrete support 17 → inverted arch concrete pouring and subsequent construction.
The operating point is as follows;
1) designing and processing an intermediate wall and a temporary inverted arch supporting structure; the intermediate wall and the temporary inverted arch I-shaped steel frame are designed according to the excavation height of the upper step, and the connecting steel plate 4 is manufactured by referring to the joint of the primary support steel arch frame. Wherein the hammer-shaped steel frame 1 of the intermediate wall is designed and processed according to the following method; divide into two units with the interim invert steelframe of upper left step, its right side unit 102 length is 1.2m, passes through connecting steel plate 4 welding formation hammer-shaped steelframe 1 with mid-board steelframe 101, and hammer-shaped steelframe 1 adds 200mm triangle-shaped stiffening steel sheet 103 in mid-board and interim invert cross section, and steel sheet 103 is thick 20mm to avoid mid-board downward pass stress too concentrated, make its atress more even, the structure is more stable. When the left lower step 13 is excavated in a subsection mode, the hammer-shaped steel frame 1 is not detached temporarily, so that the hammer-shaped steel frame and the temporary inverted arch steel frame 202 on the side of the right upper step share and transmit the upper load together before the excavation of the right lower step 15.
2) After the advanced support is constructed, the left upper step 11 of the tunnel face is excavated according to an improved CRD method, the excavation distance is not more than 2 arch frames each time, after the excavation, a left arch steel frame anchor-spraying support 501, a hammer-shaped steel frame 1 and a left upper step temporary inverted arch steel frame 201 are constructed in time, and the three are connected in pairs, so that the steel frame support of the left upper step 11 is closed into a ring.
3) After the right upper step 12 is excavated, the right arch steel frame anchor-spraying support 502 and the right upper step temporary inverted arch steel frame 202 are constructed in time and are connected with the hammer-shaped steel frame 1, so that the steel frame support of the right upper step 12 is closed into a ring.
4) Before excavating the left lower step 13, the temporary inverted arch steel frame 201 of the left upper step except the occupied part of the hammer-shaped steel frame 1 is firstly dismantled, and then the left lower step 13 is excavated by taking the distance of not less than 30cm from the end of the hammer-shaped steel frame 1 as the top edge for slope excavation. The hammer-shaped steel frame 1 of the intermediate wall is ensured to be stable in the process of dismantling the temporary inverted arch 201 and excavating, and the left lower step side wall steel frame anchor-spraying support 14 is constructed in time after the excavating is finished. The lower step 13 is excavated, and the number of arch frames is not more than 5 each time.
5) Before the right lower step 15 is excavated, the hammer-shaped steel frame 1 of the middle partition wall and the temporary inverted arch 202 of the right upper step are firstly removed, then the right lower step 15 is excavated, and the side wall steel frame anchor-spray support 16 of the right lower step is timely constructed after the excavation is finished.
6) The inverted arch excavation is not more than 6m each time, after the excavation is finished, an inverted arch steel arch frame is installed in time, concrete 17 is sprayed, the tunnel is closed to form a ring, and inverted arch and subsequent engineering are constructed in time.
Engineering example: the Emkan high-speed highway 2-segment construction general contract project 5-part leopard super-long tunnel of the Fujian high-speed highway 2-segment construction general contract project built by the Limited liability company of the Sichuan navigation construction engineering is positioned in the golden river area of the city of Leshan of the Sichuan province, and the tunnel length of 3650m (the origin-destination pile number is ZK71+ 161-ZK 74+ 811) and the tunnel length of 3603m (the origin-destination pile number is K71+ 146-K74 + 749) are control engineering of the segment. The leopard cat tunnel body section is mainly IV-grade and V-grade surrounding rocks, the V-grade surrounding rock section adopts an upper and lower step core soil remaining method, but in the construction process, a local section has larger displacement, so that an improved CRD method is adopted based on the construction progress and the surrounding rock deformation control requirement. The method is based on a step method, the step method is combined with a CRD method (a cross intermediate wall method) to form an improved CRD method, namely, an upper step is constructed by the CRD method, the tunnel upper step is divided into a left part and a right part for successive excavation support by constructing an intermediate wall and a temporary inverted arch, specifically, an intermediate wall hammer-shaped steel frame is formed by an intermediate wall steel frame and an upper step inverted arch steel frame, and the intermediate wall hammer-shaped steel frame and the other inverted arch of the upper step jointly construct a temporary support system to reduce the span of the tunnel upper step, wherein the tunnel intermediate wall and the temporary inverted arch are only supported by the temporary steel frame without filling injection concrete; the lower step still adopts left and right subsection excavation support, but does not need to be executed and do the interim support of intermediate wall. The method greatly reduces the influence of surrounding rocks on the tunnel structure in the soft rock stratum after the primary support is finished and before the inverted arch construction. On the basis of ensuring the tunnel construction progress and economy, the safety risk of tunnel construction is reduced, and the method is suitable for popularization and application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A filling-free steel frame support subsection excavation construction method for a tunnel without a lower partition wall is characterized in that the excavation construction method comprises the following steps of (1) excavating a tunnel without a lower partition wall; the method comprises the steps of combining the step method with a CRD (cross intermediate partition wall) method to form an improved CRD method, namely constructing an upper step by the CRD method, dividing the upper step of a tunnel into a left part and a right part by sequentially excavating and supporting the upper step of the tunnel through constructing an intermediate wall and a temporary inverted arch, specifically forming an intermediate wall hammer-shaped steel frame (1) by using an intermediate wall steel frame (101) and an upper step inverted arch steel frame (102), and constructing a temporary supporting system together with the other inverted arches (2) of the upper step to reduce the span of the upper step of the tunnel, wherein the intermediate wall and the temporary inverted arch of the tunnel only adopt temporary supporting without filling injection concrete; the lower step still adopts left and right sub-excavation support, but does not need to be used as the temporary support of the intermediate wall; the method greatly reduces the influence of surrounding rocks on the tunnel structure in the soft rock stratum after the primary support is finished and before the inverted arch construction; the realization process is as follows;
1) designing and processing an intermediate wall and a temporary inverted arch supporting structure; designing a middle partition wall and a temporary inverted arch I-shaped steel frame according to the excavation height of the upper step, and machining and manufacturing a connecting steel plate (4) by referring to a primary support steel arch frame joint; wherein the hammer-shaped steel frame (1) of the intermediate wall is designed and processed according to the following method; the left upper step temporary inverted arch steel frame is divided into two units, the length of a right unit (102) is 1.2m, the right unit and an intermediate wall steel frame (101) are welded through a connecting steel plate (4) to form a hammer-shaped steel frame (1), a 200 mm-200 mm triangular stiffening steel plate (103) is additionally arranged at the intersection of the intermediate wall and the temporary inverted arch on the hammer-shaped steel frame (1), and the thickness of the steel plate (103) is 20mm, so that the phenomenon that downward transmission stress of the intermediate wall is excessively concentrated is avoided, the stress is more uniform, and the structure is more stable; when the left lower step (13) is excavated in a subsection mode, the hammer-shaped steel frame (1) is not detached temporarily, so that the hammer-shaped steel frame and the temporary inverted arch steel frame (202) on the side of the right upper step (12) share and transmit upper load before the right lower step (15) is excavated;
after the advanced support is constructed, excavating a left upper step (11) of the tunnel face according to an improved CRD method, wherein the excavating distance is not more than 2 arch frames each time, and constructing a left arch steel frame anchor-spraying support (501), a hammer-shaped steel frame (1) and a left upper step temporary inverted arch steel frame (201) in time after the excavation, wherein the three are connected in pairs to close the steel frame support of the left upper step into a ring;
after the right upper step (12) is excavated, a right arch steel frame anchor-spraying support (502) and a right upper step temporary inverted arch steel frame (202) are constructed in time and are connected with the hammer-shaped steel frame (1) to close the steel frame support of the right upper step into a ring;
before excavating the left lower step (13), firstly removing the temporary inverted arch steel frame (201) of the left upper step outside the occupied part of the hammer-shaped steel frame (1), and then excavating the left lower step (13) by taking the distance of not less than 30cm from the end of the hammer-shaped steel frame (1) as the top edge to place a slope; the method comprises the following steps that (1) a temporary inverted arch (201) is dismantled, a hammer-shaped steel frame (1) of the intermediate wall is guaranteed to be stable in the excavation process, and a left lower step side wall steel frame anchor-spraying support (14) is timely constructed after excavation is completed; the lower step is excavated, and each time, no more than 5 arch frames are excavated;
before the right lower step (15) is excavated, firstly removing the hammer-shaped steel frame (1) of the middle partition wall and the temporary inverted arch (202) of the right upper step, then excavating the right lower step (15), and timely constructing the side wall steel frame anchor-spraying support (16) of the right lower step after the excavation is finished;
the inverted arch excavation is not more than 6m each time, after the excavation is finished, an inverted arch steel arch frame is installed in time, concrete (17) is sprayed, the tunnel is closed to form a ring, and inverted arch and subsequent engineering are constructed in time.
2. The excavation construction method for the filling-free steel frame support subsection of the tunnel without the lower partition wall according to claim 1, is characterized in that; in the step 1), the intermediate wall and temporary inverted arch supporting structure comprises an intermediate wall hammer-shaped steel frame (1) and a temporary inverted arch steel frame (2).
3. The excavation construction method for the filling-free steel frame support subsection of the tunnel without the lower partition wall according to claim 2, is characterized in that; the temporary inverted arch steel frame (2) is divided into a left upper step temporary inverted arch steel frame and a right upper step temporary inverted arch steel frame (202); the left upper step temporary inverted arch steel frame is divided into two units, the length of the right unit (102) is 1.2m and is welded with the mid-partition steel frame (101) to form a hammer-shaped steel frame, and the rest is the left unit (201).
4. The excavation construction method for the filling-free steel frame support subsection of the tunnel without the lower partition wall according to claim 2, is characterized in that; the middle partition wall hammer-shaped steel frame (1) is composed of a right side unit (102) of a left upper step temporary inverted arch steel frame and a middle partition wall steel frame (101); the steel plates are welded through connecting steel plates (4) to form a hammer-shaped steel frame (1), a triangular stiffening steel plate (103) with the thickness of 200mm multiplied by 200mm is additionally arranged at the intersection of the middle partition wall and the temporary inverted arch of the hammer-shaped steel frame, and the thickness of the steel plate is 20 mm.
5. The excavation construction method for the filling-free steel frame support subsection of the tunnel without the lower partition wall according to claim 2, is characterized in that; the middle partition wall is connected between the hammer-shaped steel frame (1) and the temporary inverted arch steel frame (2) of the upper step, between the hammer-shaped steel frame (1) of the middle partition wall and the tunnel arch steel frame (5) and between the temporary inverted arch steel frame (2) of the upper step and the tunnel arch steel frame (5) through connecting steel plates (4) and bolts (6), and the connecting steel plates (4) are 300 multiplied by 16mm in size.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943260A (en) * | 2020-11-13 | 2021-06-11 | 上海宝冶集团有限公司 | Tunnel middle partition wall step excavation method |
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| CN111594233B (en) | 2022-01-14 |
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