A tunnel main body top bracket type water receiving groove mounting structure

Abstract

This utility model discloses a bracket-type water collection trough installation structure for the top of a tunnel main body, comprising: a bracket assembly and a water collection trough assembly; the bracket assembly includes bracket units spaced apart along the circumference of the tunnel concrete roof slab, with both ends of each bracket unit fixed to the inner wall of the tunnel concrete roof slab and located on both sides of the expansion joint along the direction of the tunnel concrete roof slab; the water collection trough assembly includes multiple water collection troughs connected end-to-end along the circumference of the tunnel concrete roof slab, each water collection trough being fixedly built into the bracket assembly, and a sludge removal gap is formed between the top surface of the water collection trough and the tunnel concrete roof slab. With this bracket-type water collection trough installation structure, workers can periodically clean the quicksand in the water collection trough through the sludge removal gap, ensuring that the water flow is not blocked, thereby achieving long-term waterproofing. Simultaneously, the gap allows for periodic monitoring of the actual situation within the expansion joint, enabling understanding of changes in the tunnel main body.

Description

Technical Field

[0001] This utility model relates to waterproofing technology for tunnel expansion joints, specifically to a bracket-type water receiving trough installation structure on the top of the tunnel body. Background Technology

[0002] In tunnel engineering, expansion joints are crucial structures for regulating the thermal expansion and contraction of concrete structures, and their waterproofing performance directly affects the durability and operational safety of the tunnel's main structure. Existing technologies typically employ a composite waterproofing system combining external rubber waterstops, embedded steel-edged rubber waterstops, and polysulfide sealant filling, with a closed stainless steel water collection trough installed at the bottom of the expansion joint as an emergency measure for leakage.

[0003] However, engineering practice has verified that the existing technology has the following significant drawbacks:

[0004] 1. Structural construction defects: The dense reinforcement and the existence of bends at the expansion joint make it easy for honeycomb and pitted surfaces to form during the concrete pouring process. Longitudinal shrinkage cracks are prone to occur within 0-50mm on both sides of the expansion joint edge, making it a high-risk area for leakage.

[0005] 2. Difficult to maintain: Enclosed water receiving tanks are prone to clogging by silt and debris during long-term operation. Traditional structures do not have the function of cleaning and maintenance, which leads to drainage failure.

[0006] 3. Lack of monitoring: The existing structure cannot monitor the changes in the opening and closing of the expansion joints and the water leakage in real time, making it difficult to infer the health status of the main tunnel structure through the condition of the expansion joints.

[0007] 4. High maintenance costs: The water collection trough is fixed and needs to be completely removed during maintenance. It cannot be reused, and construction can only be carried out at night during tunnel operation, which significantly increases project costs and safety risks.

[0008] Therefore, there is an urgent need for a new type of waterproof structure for tunnel expansion joints, which can solve technical problems such as difficulty in construction quality control, inconvenience in maintenance and repair, and lack of monitoring and early warning while maintaining the advantages of traditional composite waterproof systems, so as to improve the reliability and economic efficiency of tunnel waterproof systems throughout their entire life cycle. Utility Model Content

[0009] In view of this, the present invention proposes a bracket-type water receiving trough installation structure on the top of the tunnel body to solve at least one of the above-mentioned technical problems.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A bracket-type water collection trough installation structure for the top of a tunnel body is installed on the lower radial side of the expansion joint of the tunnel concrete roof slab, comprising: a bracket assembly and a water collection trough assembly; the bracket assembly includes bracket units spaced apart along the circumference of the tunnel concrete roof slab, with both ends of each bracket unit fixed to the inner wall of the tunnel concrete roof slab and located on both sides of the expansion joint along the direction of the tunnel concrete roof slab; the water collection trough assembly includes multiple water collection troughs connected end to end along the circumference of the tunnel concrete roof slab, each water collection trough being fixedly built into the bracket assembly, and a sludge removal gap is formed between the top surface of the water collection trough and the tunnel concrete roof slab.

[0012] To better implement the above technical solution, optionally, the bracket unit includes a main body with a flat-bottomed U-shaped structure and connecting plate parts set on both sides of the open end of the main body. Both connecting plate parts are provided with mounting holes, and each bracket unit is installed on the tunnel concrete roof slab by expansion bolts that pass through its mounting holes and are embedded in the tunnel concrete roof slab.

[0013] Optionally, the drip lines on both sides of the expansion joint of the tunnel concrete roof are located on the upper radial side of the water receiving groove.

[0014] Optionally, the inner width of the main body is not less than 400mm, and the two outer side walls of the water receiving trough are clearance-fitted or surface-fitted with the two inner side walls of the main body.

[0015] Optionally, the contact point between the bracket unit and the water receiving tank is fixed by electric welding.

[0016] Optionally, the sludge removal gap is 40mm-80mm.

[0017] Optionally, both the bracket unit and the water receiving tank are made of stainless steel.

[0018] Optionally, the interval between adjacent bracket units in the same bracket assembly along the circumferential direction of the tunnel concrete roof is 300mm-1200mm.

[0019] The beneficial effects of this utility model are:

[0020] During tunnel operation, the tunnel structure is affected by changes in ambient temperature, resulting in thermal expansion and contraction. The expansion joints become weak points in the tunnel's waterproofing, making them prone to seepage and leakage. Moreover, the water often carries silt. This utility model's tunnel structure features a bracket-type water receiving trough installation structure on the top of the tunnel structure. When seepage occurs, the water carrying silt falls into the water receiving trough under the action of gravity. The water receiving trough is designed with an arc based on fluid mechanics principles, which can guide the water flow along the trough to the designated drainage location, preventing the water from dripping directly.

[0021] A gap for sludge removal is reserved between the top surface of the drainage trough and the concrete roof of the tunnel. Workers can use this gap to clean the accumulated sand in the drainage trough according to a predetermined maintenance schedule, maintaining unobstructed drainage and achieving long-term waterproofing of the tunnel. Furthermore, this gap allows maintenance personnel to periodically inspect the condition inside the expansion joints, thereby obtaining relevant information on changes in the main tunnel structure. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of a tunnel main body top bracket-type water receiving trough installation structure according to an embodiment of the present utility model;

[0023] Figure 2 yes Figure 1 Exploded view;

[0024] Figure 3 yes Figure 1 Installation diagram;

[0025] Attached reference numerals: 10 for tunnel concrete roof slab, 101 for expansion joint, 102 for drip line, 20 for medium-density polyethylene board, 30 for polysulfide sealant, 40 for bracket unit, 50 for water collection groove, 60 for sludge removal gap, and 70 for expansion bolt. Detailed Implementation

[0026] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Identical components are indicated by the same reference numerals.

[0027] Please see Figures 1 to 3 This utility model discloses a bracket-type water receiving trough installation structure on the top of a tunnel body, which is installed on the radial lower side of the deformation joint 101 of the tunnel concrete top slab 10.

[0028] like Figure 1 and Figure 2 As shown, an expansion joint 101 is set every 25-50m along the extension direction of the tunnel concrete roof slab. A medium-density polyethylene board 20 is installed in the upper part of the inner radial direction of the expansion joint 101, and polysulfide sealant 30 is filled in the middle part of the inner radial direction of the expansion joint 101. The expansion joint 101 is waterproofed and sealed by the medium-density polyethylene board 20 and the polysulfide sealant 30.

[0029] On both sides of expansion joint 101 in the tunnel concrete roof slab, the dense distribution of reinforcing bar bends at expansion joint 101 made vibration compaction during concrete pouring difficult, resulting in insufficient compaction in this area. During subsequent use, longitudinal cracks formed in the concrete near expansion joint 101. Drip lines 102 were created at these cracks, and two-component polysulfide sealant was filled within them. The seepage area formed by drip lines 102 and expansion joint 101, according to actual testing and statistical analysis, has a width between 300-400 mm.

[0030] Based on the above, a bracket-type water receiving trough 50 installation structure for the top of a tunnel body is provided, which includes a bracket assembly and a water receiving trough assembly. The bracket assembly includes bracket units 40 arranged at intervals along the circumference of the tunnel concrete top slab 10. The two ends of each bracket unit 40 are respectively fixed to the inner wall of the tunnel concrete top slab 10 and located on both sides of the expansion joint 101 along the direction of the tunnel concrete top slab 10. The water receiving trough assembly includes a plurality of water receiving troughs 50 connected end to end along the circumference of the tunnel concrete top slab 10. Each water receiving trough 50 is fixedly built into the bracket assembly, and a sludge removal gap 60 is formed between the top surface of the water receiving trough 50 and the tunnel concrete top slab 10.

[0031] During tunnel operation, the tunnel structure is affected by changes in ambient temperature, resulting in thermal expansion and contraction. This makes the expansion joint 101 a weak point in the tunnel's waterproofing, making it highly susceptible to seepage and leakage, especially since the water often carries sediment. When seepage occurs, the sediment-laden water falls into the water collection trough 50 under gravity. The water collection trough 50 is designed with an arc shape based on fluid mechanics principles, guiding the water flow along the trough to the designated drainage location and effectively preventing direct dripping.

[0032] A clearance 60 for sludge removal is provided between the top surface of the water collection trough 50 and the concrete roof slab of the tunnel. Workers can use this clearance to clean the quicksand deposited in the water collection trough 50 according to a predetermined maintenance schedule, ensuring unobstructed drainage and thus achieving long-term waterproofing of the tunnel. Furthermore, this clearance allows maintenance personnel to periodically inspect the condition inside the expansion joint 101, thereby obtaining relevant information on changes in the main tunnel structure.

[0033] In an embodiment of this utility model, the bracket unit 40 includes a main body with a flat-bottomed U-shaped structure and connecting plate parts disposed on both sides of the opening end of the main body. Preferably, the main body and the connecting plate parts are an integral structure, and both connecting plate parts are provided with mounting holes. Each bracket unit 40 is installed on the tunnel concrete roof 10 by expansion bolts 70 that pass through its mounting holes and are embedded in the tunnel concrete roof 10. Using expansion bolts 70 to fix the bracket unit 40 is a mature technology with a long service life.

[0034] In the embodiments of this utility model, the drip lines 102 on both sides of the expansion joint 101 of the tunnel concrete roof slab 10 are located on the upper radial side of the water receiving groove 50. Through the analysis of the existing tunnel drip lines 102, it can be seen that the drip lines 102 are located within 50mm on both sides of the expansion joint 101. The opening width at the lower radial end of the expansion joint 101 is 250mm. Therefore, the inner width of the main body is not less than 400mm. The two outer side walls of the water receiving groove 50 are fitted with the two inner side walls of the main body with a clearance fit or a face fit to ensure that the water receiving groove 50 can cover all the drip lines 102 on both sides of the expansion joint 101.

[0035] In an embodiment of this utility model, the contact point between the bracket unit 40 and the water receiving tank 50 is fixed by electric welding, thereby improving the connection strength between the bracket unit 40 and the water receiving tank 50.

[0036] In this embodiment of the utility model, the length of the water receiving trough 50 is within 2m to facilitate installation, and the ends of adjacent water receiving troughs 50 are fixed by welding.

[0037] In the embodiments of this utility model, each water receiving tank 50 and bracket unit 40 is made of stainless steel, preferably with a thickness of 2mm. Using stainless steel can prevent alkaline water seeping from the main concrete from corroding the water receiving tank 50.

[0038] In the embodiments of this utility model, the sludge removal gap 60 is 40mm-80mm, preferably 80mm. When the sludge removal gap 60 is 80mm, it is convenient to clean up quicksand without affecting the connection with water.

[0039] In the embodiments of this utility model, the interval between adjacent bracket units 40 in the same bracket assembly along the circumferential direction of the tunnel concrete roof slab 10 is 300mm-1200mm. The interval distance can be determined according to the actual size of different tunnels.

[0040] The technical solution of this utility model has been described in detail above with reference to specific embodiments. The specific embodiments described are used to help understand the concept of this utility model. Derivations and modifications made by those skilled in the art based on the specific embodiments of this utility model also fall within the protection scope of this utility model.

Claims

1. A bracket-type water receiving trough installation structure for the top of a tunnel body, installed on the radial lower side of the expansion joint (101) of the tunnel concrete roof slab (10), characterized in that: include: Bracket assembly and water receiving tank assembly; The bracket assembly includes bracket units (40) spaced apart along the circumferential direction of the tunnel concrete roof slab (10). The two ends of each bracket unit (40) are fixed to the inner wall of the tunnel concrete roof slab (10) and located on both sides of the expansion joint (101) along the direction of the tunnel concrete roof slab (10). The bracket unit (40) includes a main body with a flat-bottomed U-shaped structure and connecting plate parts on both sides of the opening end of the main body. The inner width of the main body is not less than 400mm. Both connecting plate parts are provided with mounting holes. Each bracket unit (40) is installed on the tunnel concrete roof slab (10) by expansion bolts (70) that pass through its mounting holes and are embedded in the tunnel concrete roof slab (10). The water receiving trough assembly includes multiple water receiving troughs (50) connected end to end along the circumference of the tunnel concrete roof slab (10). The drip lines (102) on both sides of the expansion joint (101) of the tunnel concrete roof slab (10) are located on the upper radial side of the water receiving trough (50). Each water receiving trough (50) is fixedly built into the bracket assembly, and a sludge clearance gap (60) is formed between the top surface of the water receiving trough (50) and the tunnel concrete roof slab (10). The two outer side walls of the water receiving tank (50) are fitted with the two inner side walls of the main body with a gap or a surface fit, and the contact point between the bracket unit (40) and the water receiving tank (50) is fixed by electric welding.

2. The installation structure of the tunnel body top bracket-type water receiving trough according to claim 1, characterized in that, The sludge clearance (60) is 40mm-80mm.

3. The installation structure of the tunnel body top bracket-type water receiving trough according to claim 1, characterized in that, Both the bracket unit (40) and the water receiving tank (50) are made of stainless steel.

4. The installation structure of the tunnel body top bracket-type water receiving trough according to claim 1, characterized in that, The interval between adjacent bracket units (40) in the same bracket assembly along the circumferential direction of the tunnel concrete roof slab (10) is 300mm-1200mm.

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