Construction reinforcing structure for gradually changing small section into large section in underground excavation section of water-free sand layer
By using a reinforcement structure consisting of a reinforcement frame and limiting anchor bolts in the anhydrous sand layer, the problem of reduced surrounding rock stability during the construction of the small-section-to-large-section section in the anhydrous sand layer was solved, thereby improving the stability and safety of the construction process.
Patent Information
- Application Number
- CN202423136732.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-19
AI Technical Summary
During the construction of the tunnel section in the waterless sand layer, where the small cross-section gradually becomes a large cross-section, the existing reinforcement structure needs to be demolished, which leads to a decrease in the stability of the surrounding rock and an increase in safety hazards.
The reinforcement structure consists of a reinforced frame, support plate, reinforcing rod, limiting arc plate, limiting anchor rod and limiting ring, etc. A stable connection is formed by inserting and grouting in the surrounding rock at the top of the transverse guide tunnel, so as to avoid secondary disturbance to the surrounding rock.
It improves the stability of the surrounding rock and the safety of construction, reduces safety hazards, and ensures the stability and safety of the construction process.
Smart Images
Figure CN223469276U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a tunnel construction technical field, concretely is a kind of waterless sand layer excavation section small section gradually large section construction reinforcing structure. BACKGROUND
[0002] Waterless sand layer geological condition usually refers to that underground water level is lower, and soil layer is mainly composed of sand grain, and this stratum is poor in self-stability, and prone to collapse, and waterless sand layer excavation section small section gradually large section construction reinforcing structure refers to the reinforcing means in the construction process of the tunnel or underground passage from smaller section gradually transition to larger section under the condition of underground waterless sand layer, to ensure construction safety and surrounding rock stability.
[0003] In the engineering construction of subway, underground passage and the like, the transition section from small section to large section is often encountered, and the construction difficulty is increased due to the large size change of the transition section, and the flowability of sand layer easily leads to collapse accident in the construction process, so special reinforcing measures are needed to ensure construction safety, and the existing excavation section small section gradually large section construction needs to be broken in the expansion process, which causes secondary disturbance to surrounding rock, reduces the stability of surrounding rock, and has certain safety hazard. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing a kind of waterless sand layer excavation section small section gradually large section construction reinforcing structure to solve the problem of the excavation section small section gradually large section construction in the above background technology, which needs to be broken in the expansion process, causes secondary disturbance to surrounding rock, reduces the stability of surrounding rock, and has certain safety hazard.
[0005] To achieve the above object, the utility model provides the following technical scheme, a kind of waterless sand layer excavation section small section gradually large section construction reinforcing structure: including small section tunnel and large section tunnel, the side of the large section tunnel is provided with transverse pilot pit, the small section tunnel and transverse pilot pit are provided with excavation tunnel between, the transverse pilot pit is provided with reinforcing structure, the reinforcing structure includes reinforcing frame, the reinforcing frame is arranged at the top of transverse pilot pit, the surface of reinforcing frame is fixedly connected with support plate, the surface of support plate is fixedly connected with reinforcing bar, the surface of support plate is fixedly connected with limit arc plate, the upper surface of limit arc plate is poured with reinforcing concrete, the bottom of reinforcing frame is fixedly connected with limit block, the surface of limit block is connected with limit anchor rod by perforation, the surface of limit anchor rod is fixedly connected with limit ring, the surface of limit anchor rod is provided with through-hole.
[0006] Preferably, the transverse guide hole forms a working face on one side of the large-section tunnel, and the tunnel is excavated from the transverse guide hole towards the small-section tunnel.
[0007] Preferably, the reinforcing frame is composed of a plurality of transverse rods and two longitudinal rods, the support plates are arranged in a plurality of groups and are in an arc shape, and two ends of the support plates are fixedly connected to the longitudinal rods of the reinforcing frame.
[0008] Preferably, a plurality of circular holes are formed in the surface of the support plate, the reinforcing rods are fixedly connected to the circular holes of the plurality of support plates, and the reinforcing rods are arranged in a plurality of groups and are uniformly distributed in an arc shape on the surface of the support plate.
[0009] Preferably, the limiting arc plate is in an arc shape, the reinforced concrete is poured between the top surrounding rock of the transverse guide hole and the limiting arc plate, and the reinforced concrete is in an arc shape.
[0010] Preferably, the limiting blocks are arranged in a plurality of groups and are linearly and uniformly arranged, and the limiting ring limits the perforation position of the limiting anchor rod on the limiting block.
[0011] Preferably, the limiting anchor rod is hollow, and a plurality of through holes are formed in the surface of the limiting anchor rod and are uniformly distributed on the surface of the limiting anchor rod.
[0012] Compared with the prior art, the utility model has the advantages that:
[0013] 1. The reinforcing structure is inserted into the surrounding rock at the top of the transverse guide hole, so that the limiting ring is connected to the limiting block, at this time, the limiting anchor rod is grouted into the surrounding rock of the transverse guide hole, the through holes uniformly output the slurry to the vicinity of the limiting anchor rod, after the concrete solidifies, the surrounding rock of the transverse guide hole limits the position of the limiting anchor rod, the limiting anchor rod limits the position of the reinforcing frame through the limiting ring and the limiting block, thereby limiting the positions of the support plate and the reinforcing rod, the reinforcing rod supports the limiting arc plate, and the grouting between the limiting arc plate and the surrounding rock at the top of the transverse guide hole is performed again, so that the transverse guide hole is reinforced, at this time, the construction safety inside the transverse guide hole is ensured, the tunnel is excavated from the transverse guide hole, and the small-section tunnel is excavated, after the reinforcing mechanism is constructed, it is not necessary to be destroyed, secondary disturbance to the surrounding rock is avoided, the stability of the surrounding rock is improved, the safety hidden danger is reduced, the stability of the transverse guide hole is improved, and the construction safety is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a front view sectional view of the tunnel structure of the utility model;
[0015] Figure 2 It is a front view schematic view of the reinforcing structure of the utility model.
[0016] Figure 3 This is a front perspective schematic diagram of the reinforcement structure of the utility model;
[0017] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure at A in the middle;
[0018] Figure 5 It is a front view and a sectional perspective schematic diagram of the position-limiting anchor rod structure of the present utility model.
[0019] In the figure: 1. Small-section tunnel; 11. Large-section tunnel; 12. Horizontal pilot pit; 13. Blind-excavated tunnel; 2. Reinforcement frame; 21. Support plate; 22. Reinforcement rod; 23. Limiting arc plate; 24. Reinforced concrete; 25. Limiting block; 26. Limiting anchor rod; 27. Limiting ring; 28. Through hole. DETAILED DESCRIPTION
[0020] See also Figures 1-5 , an embodiment provided by the utility model:
[0021] A reinforcement structure for construction of a small-section gradually changing to a large-section in a waterless sand layer dark excavation interval: comprising a small-section tunnel 1 and a large-section tunnel 11, a transverse guide pit 12 is provided on one side of the large-section tunnel 11, a dark excavation tunnel 13 is provided between the small-section tunnel 1 and the transverse guide pit 12, a reinforcement structure is provided on the transverse guide pit 12, the reinforcement structure comprising a reinforcement frame 2, the reinforcement frame 2 is provided on the top of the transverse guide pit 12, a support plate 21 is fixedly connected to the surface of the reinforcement frame 2, a reinforcing rod 22 is fixedly connected to the surface of the support plate 21, a limiting arc plate 23 is fixedly connected to the surface of the support plate 21, and the upper surface of the limiting arc plate 23 is cast with reinforcing concrete. Soil 24, the bottom of the reinforcement frame 2 is fixedly connected to a limiting block 25, the surface of the limiting block 25 is perforated and connected to a limiting anchor rod 26, the surface of the limiting anchor rod 26 is fixedly connected to a limiting ring 27, and a through hole 28 is provided on the surface of the limiting anchor rod 26. The reinforcement mechanism is dug from the large-section tunnel 11 to the small-section tunnel 1 through the transverse guide pit 12, so that the reinforcement mechanism of the dark-excavated tunnel 13 does not need to be removed after the construction of the dark-excavated tunnel 13 is completed, thereby avoiding secondary disturbance to the surrounding rock, improving the stability of the surrounding rock, and reducing safety hazards. In addition, the reinforcement mechanism improves the stability of the transverse guide pit 12 and ensures construction safety.
[0022] Furthermore, a transverse guide pit 12 forms a working face on one side of the large-section tunnel 11, and a concealed tunnel 13 is excavated from the transverse guide pit 12 toward the small-section tunnel 1, and the large-section tunnel 11 is stepped on one side of the transverse guide pit 12, which facilitates the concealed excavation of the small-section tunnel 1 at the transverse guide pit 12.
[0023] Further, the reinforcing frame 2 is composed of multiple groups of horizontal rods and two groups of longitudinal rods, the support plates 21 are provided with multiple groups and are in arc shape, both ends of the support plates 21 are fixedly connected to the longitudinal rods of the reinforcing frame 2, and the reinforcing rods 22 can support the limiting arc plates 23.
[0024] Further, the surface of the support plates 21 is provided with circular holes, the reinforcing rods 22 are fixedly connected to the circular holes of the multiple groups of support plates 21, and the reinforcing rods 22 are provided with multiple groups and are evenly distributed in arc shape on the surface of the support plates 21, the reinforcing frame 2 supports the support plates 21 and the reinforcing rods 22, so that the support plates 21 and the reinforcing rods 22 are moved to the top of the horizontal guide pit 12.
[0025] Further, the limiting arc plates 23 are in arc shape, the reinforcing concrete 24 is poured between the top surrounding rock of the horizontal guide pit 12 and the limiting arc plates 23, and the reinforcing concrete 24 is in arc shape, at this time, the reinforcing concrete 24 reinforces the connection between the limiting arc plates 23 and the top surrounding rock of the horizontal guide pit 12, and improves the reinforcing effect on the inside of the horizontal guide pit 12.
[0026] Further, the limiting blocks 25 are provided with multiple groups and are linearly and uniformly arranged, the limiting ring 27 limits the position of the limiting anchor rod 26 on the perforated position of the limiting block 25, so that the installation position of the limiting anchor rod 26 on the limiting block 25 can be quickly found, the limiting anchor rod 26 is inserted into the surrounding rock on the top side of the horizontal guide pit 12, and grouting can be performed into the surrounding rock inside the horizontal guide pit 12 through the limiting anchor rod 26.
[0027] Further, the limiting anchor rod 26 is hollow, and multiple groups of through holes 28 are formed on the surface of the limiting anchor rod 26, the through holes 28 are evenly distributed on the surface of the limiting anchor rod 26, and the concrete is output into the surrounding rock on the top of the horizontal guide pit 12 through the through holes 28 on the limiting anchor rod 26, the position of the limiting anchor rod 26 is limited after the concrete solidifies, the position of the reinforcing frame 2 is limited by the limiting anchor rod 26 through the limiting ring 27 and the limiting block 25, and the position of the support plates 21 and the reinforcing rods 22 is limited.
[0028] Working principle: the transverse guide pit 12 is inserted in the surrounding rock at the top of the transverse guide pit 12, so that the limiting ring 27 is connected to the limiting block 25, at this time the grouting is carried out to the surrounding rock of the transverse guide pit 12 through the limiting anchor rod 26, the through hole 28 uniformly outputs the slurry to the vicinity of the limiting anchor rod 26, after the concrete solidifies, the surrounding rock of the transverse guide pit 12 limits the position of the limiting anchor rod 26, the limiting anchor rod 26 limits the position of the reinforcing frame 2 through the limiting ring 27 and the limiting block 25, and further limits the position of the supporting plate 21 and the reinforcing rod 22, the reinforcing rod 22 supports the limiting arc plate 23, and the grouting can be carried out again between the limiting arc plate 23 and the surrounding rock at the top of the transverse guide pit 12, so as to form the reinforcement to the inside of the transverse guide pit 12, at this time the construction safety inside the transverse guide pit 12 is ensured, the tunnel 13 is excavated from the transverse guide pit 12, and the small cross-section tunnel 1 is excavated until the small cross-section tunnel 1 is excavated, the reinforcing mechanism does not need to be destroyed after the construction is completed, secondary disturbance to the surrounding rock is avoided, the stability of the surrounding rock is improved, the safety hidden danger is reduced, and the reinforcing mechanism improves the stability of the transverse guide pit 12, and ensures the construction safety.
Claims
1. A construction reinforcing structure for a small-section-to-large-section gradual change of a small-section tunneling interval in an anhydrous sand layer, comprising a small-section tunnel and a large-section tunnel, characterized in that: The large-section tunnel is provided with a transverse guide pit on one side, the small-section tunnel and the transverse guide pit are provided with a tunnel excavated, the transverse guide pit is provided with a reinforcing structure, the reinforcing structure comprises a reinforcing frame, the reinforcing frame is arranged on the top of the transverse guide pit, a support plate is fixedly connected to the surface of the reinforcing frame, a reinforcing rod is fixedly connected to the surface of the support plate, a limiting arc plate is fixedly connected to the surface of the support plate, reinforcing concrete is cast on the upper surface of the limiting arc plate, a limiting block is fixedly connected to the bottom of the reinforcing frame, a limiting anchor rod is connected to the surface of the limiting block in a perforated manner, a limiting ring is fixedly connected to the surface of the limiting anchor rod, and a through hole is formed in the surface of the limiting anchor rod.
2. The construction reinforcing structure for a small-section-to-large-section gradual transition of a non-aquifer tunnel section according to claim 1, characterized in that: The transverse guide pit forms a working face on one side of the large-section tunnel, and the tunnel excavated is excavated from the transverse guide pit to the direction of the small-section tunnel.
3. The construction reinforcing structure for a small-section-to-large-section gradual transition of a non-aquifer tunnel section according to claim 1, characterized in that: The reinforcing frame is composed of multiple groups of cross bars and two groups of longitudinal bars, the support plate is provided with multiple groups and is in an arc shape, and the two ends of the support plate are fixedly connected to the longitudinal bars of the reinforcing frame.
4. The construction reinforcing structure for a small-section-to-large-section gradual transition of a non-aquifer tunnel section according to claim 1, characterized in that: The surface of the support plate is provided with a circular hole, the reinforcing rod is fixedly connected to the circular holes of multiple groups of support plates, and the reinforcing rod is provided with multiple groups and is evenly distributed in an arc shape on the surface of the support plate.
5. The construction reinforcing structure for a small-section-to-large-section gradual transition of a non-aquifer tunnel section according to claim 4, characterized in that: The limiting arc plate is in an arc shape, the reinforcing concrete is cast between the top surrounding rock of the transverse guide pit and the limiting arc plate, and the reinforcing concrete is in an arc shape.
6. The construction reinforcing structure for a small-section-to-large-section gradual transition of a non-aquifer tunnel section according to claim 1, characterized in that: The limiting block is provided with multiple groups and is linearly and uniformly arranged, and the limiting ring limits the perforated position of the limiting anchor rod on the limiting block.
7. The reinforcement structure for construction with a small-section gradually changing to a large-section in a concealed excavation section of anhydrous sand layer according to claim 1 is characterized by: The limiting anchor rod is hollow, and multiple groups of through holes are formed in the surface of the limiting anchor rod, and the through holes are evenly distributed on the surface of the limiting anchor rod.