阅读说明：本技术 一种贯穿式漏斗形隧道塌坑防扩张的快速治理方法 (Rapid treatment method for preventing collapse and expansion of through funnel-shaped tunnel ) 是由 王春国 李树忱 杨世锋 王鹏程 陈国占 康永炜 冯现大 熊斌 张海洋 宫斌 于 2020-06-16 设计创作，主要内容包括：本发明涉及一种贯穿式漏斗形隧道塌坑防扩张的快速治理方法,其施工步骤包括：高膨胀发泡型硅酸盐树脂模袋注入、抛投/吊装至塌坑漏斗颈位置、材料膨胀并提供支撑力,完成应急治理。本发明具有以下优点：1、可以防止隧道塌坑进一步崩塌扩张；2、反应迅速,保证应急处理的速度；3、无需人员进入再次塌落的风险区域,安全性高。(The invention relates to a rapid treatment method for preventing pit collapse and expansion of a through funnel-shaped tunnel, which comprises the following construction steps: injecting the high-expansion foaming type silicate resin mold bag, throwing/hoisting the mold bag to the position of the collapsed funnel neck, expanding the material and providing a supporting force to complete emergency treatment. The invention has the following advantages: 1. the tunnel collapse pit can be prevented from further collapsing and expanding; 2. the reaction is rapid, and the emergency treatment speed is ensured; 3. people do not need to enter a re-collapse risk area, and safety is high.)

1. A rapid treatment method for preventing collapse and expansion of a through funnel-shaped tunnel is characterized by comprising the following steps:

and injecting the double-liquid foaming type silicate resin into the grouting mold bag, then throwing or hoisting the grouting mold bag to the position of the collapsed funnel neck, expanding the material and providing a supporting force to complete emergency treatment.

2. The rapid treatment method according to claim 1, wherein the reaction time of the two-liquid foaming type silicate resin is adjustable within 0.5-5min, the foaming rate is 10-30 times, the compressive strength under the constraint condition is more than 2MPa, and the reaction exothermic temperature is less than 80 ℃.

3. The rapid remediation method of claim 1 wherein the injection molding bag is a chemical grout injection molding bag made of a fiber textile; and a buckle which is quickly connected and detached with the grouting pipe is reserved on the mold bag.

4. A rapid management method according to claim 1, wherein the casting is carried out using a square bag having a width of 50cm and a pillow shape after inflation.

5. The rapid treatment method according to claim 1, wherein a group of a plurality of mould bags for hoisting is bundled with a hoisting framework, and the hoisting framework is a welded steel reinforcement framework.

6. The rapid remediation method of claim 5 wherein the hoisting mould bag is a cylinder 200cm high and 100cm in diameter after being foamed.

7. The rapid remediation method of claim 2 wherein the biliquid intumescent silicate resin is injected into the mould via a static mixer at a volume ratio of 1: 1.

8. The rapid treatment method according to claim 1, wherein when the muck is connected with the funnel neck, the grouting mold bag is thrown to the position of the collapsed funnel neck, and the rapid treatment method comprises the following steps:

selecting a two-liquid foaming type silicate resin with the reaction time of 5min and the foaming rate of 15 times, wherein the compressive strength is more than 2MPa under the constraint condition, and the reaction heat release temperature is less than 80 ℃; the mold bag is 50cm by 50cm pillow-shaped, and the volume of the single bag is about 0.05m after expansion³Personnel and equipment arrangement cannot cross a pulling damage unstable area of the earth surface; the A, B component of the biliquid intumescent silicate resin slurry was pumped by a biliquid grouting pump at a volume ratio of 1:1,uniformly mixing the materials by a grouting pipe through a shaft mixer and injecting the mixture into a mold bag; and before the materials in the membrane bag react and expand, the materials are thrown to the position corresponding to the funnel neck collapse expansion area, so that the rapid treatment is completed.

9. The rapid treatment method according to claim 1, wherein when the muck is not connected with the funnel neck, the grouting mold bag is hoisted to the position of the collapsed funnel neck, and the rapid treatment method comprises the following steps:

selecting a two-liquid foaming type silicate resin with the reaction time of 3min and the foaming rate of 30 times, wherein the compressive strength is more than 2MPa under the constraint condition, and the reaction heat release temperature is less than 80 ℃; the method adopts a hoisting type plugging method, the mould bag adopts a cylindrical mould bag with the volume of 200cm phi 100cm, and the volume of a single membrane bag after expansion is about 3m³The method comprises the following steps that personnel and equipment are arranged in a crack initiation area which cannot cross the ground surface, a steel bar framework is welded for hoisting the framework, two mould bags are firmly bound on the framework, A, B components of the biliquid foaming type silicate resin slurry are pumped by a biliquid grouting pump according to the volume ratio of 1:1, and the components are uniformly mixed by a grouting pipe through a shaft mixer and are injected into the mould bags; and hoisting the membrane bag to a funnel neck collapse and expansion area before the materials in the membrane bag react and expand, and finishing quick treatment.

Technical Field

The invention relates to a rapid management method for preventing a through funnel-shaped tunnel from collapsing and expanding, belonging to the technical field of tunnel collapse protection.

Background

In recent years, accidents caused by ground surface collapse due to local collapse of tunnels occur, vehicles are swallowed in serious accidents, casualties are caused, urban traffic is seriously hindered, and very negative social effects are caused. Collapsed pits usually appear funnel-shaped, and if not properly treated, are also at risk of collapse and further expansion, causing secondary disasters. Therefore, the tunnel collapse pit side is treated, and the funnel neck area is subjected to rapid emergency treatment, which is very important.

The existing tunnel communication collapse pit processing method mainly applies a retaining wall in a tunnel and backfills concrete, and special filling emergency reinforcement for a collapse pit funnel neck is not provided. In the treatment process, the risk of collapse and sliding of the fracture area and further expansion of a collapsed pit still exists, the concrete backfilling and curing time is slow, the waste is caused by large-volume backfilling, and the subsequent construction of the tunnel is influenced.

Disclosure of Invention

The invention provides a rapid treatment method for preventing collapse and expansion of a through funnel-shaped tunnel. The invention can prevent tunnel collapse pit from further collapsing and expanding; the emergency treatment speed is guaranteed, and meanwhile, people do not need to enter a re-collapse risk area. The technical scheme of the invention is as follows:

a rapid treatment method for preventing pit collapse and expansion of a through funnel-shaped tunnel comprises the following construction steps:

and injecting the double-liquid foaming type silicate resin into the grouting mold bag, then throwing or hoisting the grouting mold bag to the position of the collapsed funnel neck, expanding the material and providing a supporting force to complete emergency treatment.

The method comprises the following specific steps:

the reaction time of the double-liquid foaming type silicate resin is adjustable within 0.5-5min, the foaming multiplying power is 10-30 times, the compressive strength is more than 2MPa under constraint conditions, the reaction heat release temperature is less than 80 ℃, and the double-liquid foaming type silicate resin is non-toxic and harmless.

The injection mould bag is a special injection mould bag for chemical grout, is made of fiber textile, and needs to have good air permeability, and the chemical grout is not easy to permeate before solidification; and a buckle which is quickly connected and detached with the grouting pipe is reserved on the mold bag.

The size of the mould bag used for casting is smaller, a square mould bag with the width of 50cm is preferred, and the mould bag is in a pillow shape after being expanded; the size of the mould bag used for hoisting is large, a plurality of mould bags are bundled with a prefabricated hoisting framework, the hoisting framework can be realized by welding a steel bar framework, or other frameworks which can well fix and support the membrane bag, the quantity of the hoisted membrane bags is estimated according to the volume of the funnel neck and the volume of the expanded membrane bag in advance, finally, the total volume of the expanded membrane bag/the volume of the funnel neck is more than 1.5, certain supporting force can be generated to the lateral direction of the funnel neck, and the hoisting mould bags are preferably cylindrical with the height of 200cm and the diameter of 100cm after being foamed.

In the invention, when the mould bag is injected with the slurry, the two-fluid foaming type silicate resin is controlled in a volume ratio of 1:1 and is injected into the mould bag through the static mixer, so that the slurry is uniformly mixed.

Furthermore, operators of the throwing type rapid treatment method should be in a crack initiation area and a rear area; the lifting appliance in the lifting type rapid treatment scheme is positioned behind a crack initiation area so as to ensure the safety of operators and equipment.

Compared with the prior art, the invention has the following advantages:

1. the tunnel collapse pit can be prevented from further collapsing and expanding;

2. the reaction is rapid, and the emergency treatment speed is ensured;

3. people do not need to enter a re-collapse risk area, and safety is high.

Drawings

FIG. 1 is a schematic view of a funnel-shaped tunnel collapse pit disease;

FIG. 2 is a schematic view of a mold bag and a two-component grouting pump used in the present invention;

FIG. 3 is a schematic diagram of the invention in a drop fill configuration;

FIG. 4 is a schematic illustration of the present invention in a lift-and-fill configuration;

in the figure: 1: pulling the destabilization zone; 2: a funnel neck collapse expansion zone; 3: a crack initiation zone; 4: sludging; 5: the earth surface; 6: collapsing a pit in a funnel shape; 7: a tunnel; 8: grouting a mold bag; 9: a static mixer; 10: a grouting pipe; 11: a double-liquid grouting pump; 12: throwing filling treatment; 13: and (5) hoisting type filling treatment.

Detailed Description

The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. The examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.