Pretreatment method for shield tunnel segment with ballast bed disengagement
A shield tunnel segment and pretreatment technology, which is used in tunnels, tunnel lining, earthwork drilling, etc., can solve the problems of endangering driving safety, low bond strength, lack of segment-track bed interface treatment methods, etc. Adhesive strength, the effect of suppressing the void of the ballast bed
Pending Publication Date: 2021-12-17
SOUTHEAST UNIV
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Problems solved by technology
If things go on like this, the gap between the ballast bed and the segment can reach several millimeters, affecting the support of the track to the train and endangering the safety of driving
The integral ballast bed in the existing subway shield tunnel is directly poured on the shield tunnel segment during construction, and the bonding strength of the contact interface between the segment and the ballast bed concrete is low, which leads to frequent occurrence of ballast defects in the shield tunnel
At present, the research on ballast bed voiding mainly focuses on the detection and repair technology of ballast bed voiding, lack of preventive treatment measures to prevent the occurrence of ballast bed voiding, that is, lack of effective segment-ballast bed interface treatment methods to ensure the interface Bond strength
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Embodiment 1
[0032] Such as figure 1 As shown, the shield tunnel segment pretreatment method used in this example includes segment-ballast bed interface partition method and interface treatment measures. According to the mechanical characteristics of the interface between the shield tunnel segment and the cast-in-place ballast bed, and considering the development process of the ballast bed void, the segment-ballast bed interface is divided into the reinforcement reinforcement area 1, the longitudinal seam chiseling area 2, and the water gun washing area 3. The water gun flushing area 3 is the shield tunnel segment-ballast bed interface area, including the planting reinforcement area 1 and the longitudinal seam cutting area 2.
[0033] Such as figure 2 As shown, reinforcement area 1 is an area on the segment-ballast bed interface, which is divided on the inner arc surface of the segment, and its orthographic projection is a rectangle. Each shield tunnel segment has two reinforcement area...
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The invention belongs to the field of shield tunnel construction, and particularly relates to a shield tunnel segment pretreatment method for preventing a ballast bed from disengaging. According to the pretreatment method for shield tunnel segments with ballast bed disengagement, each independent shield tunnel segment is divided into an embedded steel bar reinforcing area, a longitudinal joint dabbing area and a water gun washing area; the embedded steel bar reinforcing area is located in a ballast bed interface area of the shield tunnel segment and is divided on the inner arc face of the shield tunnel segment; the longitudinal joint dabbing area is located in a ballast bed interface area of the shield tunnel segment, is divided in areas at two sides of a longitudinal joint of the spliced shield tunnel segment and is aligned with a circular seam of the shield tunnel segment; and the water gun washing area is the ballast bed interface area of the shield tunnel segment and comprises an embedded steel bar reinforcing area and a longitudinal joint dabbing area. According to the pretreatment method, the occurrence rate of the ballast bed disengagement and the ballast bed disengagement area under the action of train load and tunnel deformation can be effectively reduced. The occurrence of the ballast bed disengagement is inhibited in the aspect of disease prevention.
Description
technical field [0001] The invention belongs to the field of shield tunnel construction, and in particular relates to a shield tunnel segment pretreatment method for preventing ballast bed voiding. Background technique [0002] The track bed of subway tunnel is an important part of the subway structure. Under the influence of factors such as long-term train vibration, tunnel structure deformation, construction quality and surrounding engineering activities, part of the track bed is peeled off from the lower segment. Water in the surrounding rock seeps out of the ballast bed through structural cracks. At the same time, the seepage water that erodes the ballast bed causes the concrete between the ballast bed and its substructure to vibrate and grind into mud and precipitate fine sand. Finally, when the train passes by, it returns from various gaps in the ballast bed and the structural surface, forming mud and mud. Cause the whole track bed to be voided. If things go on like ...
Claims
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IPC IPC(8): E21D11/08
CPCE21D11/08Y02E10/20
Inventor 金浩
Owner SOUTHEAST UNIV