Initial support local water seepage tunnel drainage system suitable for alpine region

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a primary support local water seepage tunnel drainage system suitable for an alpine region. Comprising a pressure relief steel pipe arranged on a primary support layer in a driving mode and a water guiding and draining blind pipe embedded in the primary support layer, the drilling position of the pressure relief steel pipe is staggered with an adjacent primary building annular construction joint and keeps a certain distance from the primary building annular construction joint, and one end of the pressure relief steel pipe is communicated with the interior of a water seepage area and is driven perpendicular to the water seepage area. The other end of the pressure relief steel pipe is connected with a drainage blind pipe, the drainage blind pipe is wrapped by a heat preservation layer, the tail end of the drainage blind pipe is connected with a side wall drainage pipe, and the tail end of the side wall drainage pipe drains water to a water storage point and drains the water out of the hole through a drainage facility. According to the utility model, the conditions of primary support function loss, substandard construction quality and construction safety caused by water seepage during primary support construction in the alpine region can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a drainage system for a primary branch local seepage tunnel in high-cold areas. Background Art

[0002] The waterproofing and drainage design of the tunnel adopts the principle of "combining prevention, drainage, interception and blocking, taking measures according to local conditions and comprehensive management"; for areas where groundwater is developed and tunnel construction may have an adverse impact on the ecological environment or engineering environment, the principle of "blocking as the main method and limited discharge" is adopted to achieve the purpose of effective water blocking, reliable waterproofing and economic rationality. When adopting the principle of "blocking as the main method", the lining structure should be appropriately strengthened according to the water blocking effect, drainage status and measures, and reasonable consideration should be given to bearing part of the water pressure.

[0003] Usually, the biggest construction difficulty encountered during tunnel construction is the treatment method of groundwater. This is because once a sudden water seepage problem occurs during tunnel construction, it will have a great impact on the progress of the tunnel project. However, since the hydrogeological conditions and soil and surrounding rock characteristics of the construction site are not exactly the same, it is difficult to completely carry out water enrichment prevention work in actual construction. Especially in high-altitude and cold areas, once freezing occurs, it will cause the loss of stability of the primary support, resulting in deformation convergence and the primary support is easy to fall off. Therefore, it is very necessary to take effective and timely measures to effectively treat sudden water seepage. Utility Model Content

[0004] In order to solve the problem of water seepage in the initial branch of the above-mentioned high-cold tunnel during construction, the utility model provides a drainage system for the initial branch local water seepage tunnel in high-cold areas. It uses the principle of drainage and pressure reduction by drilling holes to effectively solve the problem of water seepage on the initial branch surface in high-cold areas while ensuring the quality and safety of the initial branch construction in high-cold areas. The utility model has high drilling efficiency, simple equipment and strong operability.

[0005] The utility model adopts the following technical scheme to achieve the above-mentioned purpose: a drainage system for a local seepage tunnel with initial support in high-cold areas, characterized in that it includes a pressure relief steel pipe laid on the initial support layer and a drainage blind pipe buried in the initial support layer, the drilling position of the pressure relief steel pipe is staggered from the adjacent initial masonry annular construction joints, and a certain distance is maintained from the initial masonry annular construction joints, one end of the pressure relief steel pipe is connected to the seepage area, and is laid perpendicular to the initial support surface of the seepage area, the laying depth of the pressure relief steel pipe does not exceed the seepage area, the other end of the pressure relief steel pipe is connected to the drainage blind pipe, the outside of the drainage blind pipe is wrapped with a thermal insulation layer, and the end is connected to the side wall drainage pipe, and the end of the side wall drainage pipe is drained to the water storage point and discharged to the outside of the cave through the drainage facility.

[0006] The pressure relief steel pipe is a steel pipe with a diameter of 30 to 50 mm. The diameter is adjusted according to the water flow rate. The distance between the drilling position and the initial masonry annular construction joint is greater than 1m, and the buried depth is not less than 10cm from the initial support layer. The pressure relief hole is drilled using a 28 drill.

[0007] The diameter of the drainage blind pipe is 30-50 mm, and the external insulation layer is non-woven fabric and composite insulation material.

[0008] The composite thermal insulation material is a polyurethane thermal insulation material, and the material is made into arc blocks according to on-site requirements.

[0009] The side wall drainage pipe is grooved and arranged along the side wall, and the drainage blind pipe is grooved and buried in the primary support layer.

[0010] The system is implemented when water seepage is discovered after the initial support construction.

[0011] The utility model provides a drainage system for a local seepage tunnel of a primary support in a high-cold area. The pressure relief is reasonably set, and the principle of drilling drainage and pressure reduction is used to reduce the seepage pressure at the primary support seepage position. When the primary support is constructed in a high-cold area, the problem of water seepage is effectively solved. At the same time, the pressure relief holes and blind pipes and thermal insulation treatment are reasonably set to drain the seepage water that affects the quality and safety of the primary support. The water diversion pipe is thermally insulated to avoid freezing in the high-cold area, causing freezing of the drainage part, avoiding the weakening of the support function due to water seepage, the reduced adhesion of the surrounding rock and shotcrete due to water gushing, the easier loss of the anchoring material of the anchor rod, and the weakening of the support effect.

[0012] The installation position of the drainage pipe is staggered according to the lining construction layout position and the construction joint, and the distance from the circumferential construction joint is greater than 1m; the drainage pipe is wrapped with geotextile and then covered with concrete spraying to enhance the insulation effect and enhance the subsequent use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0014] Figure 2 This is an enlarged view of the pressure relief steel pipe and the drainage blind pipe;

[0015] Figure 3 This is an enlarged view of the drainage blind pipe and the side wall drainage pipe;

[0016] In the figure: 1-primary support layer, 2-seepage area, 3-pressure relief steel pipe, 4-drainage blind pipe, 5-insulation layer, 6-sprayed covering layer, 7-side wall drainage pipe. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and embodiments. Example

[0018] like Figure 1-Figure 3 As shown, a drainage system for a primary support local seepage tunnel in high-cold areas includes a pressure relief steel pipe 3 driven on the primary support layer 1 and a water diversion blind pipe 4 buried in the primary support layer 1. The drilling position of the pressure relief steel pipe 3 is staggered from the adjacent primary masonry annular construction joints and maintains a certain distance from the primary masonry annular construction joints. One end of the pressure relief steel pipe 3 is connected to the seepage area 2 and is driven perpendicular to the primary support surface of the seepage area. The driving depth of the pressure relief steel pipe 3 does not exceed the seepage area 2. The other end of the pressure relief steel pipe 3 is connected to the water diversion blind pipe 4. The outside of the water diversion blind pipe 4 is wrapped with a thermal insulation layer 5, and the end is connected to the side wall drainage pipe 7. The end of the side wall drainage pipe 7 drains to a water storage point and is discharged to the outside of the cave through drainage facilities.

[0019] The pressure relief steel pipe 3 is a steel pipe with a diameter of 30 to 50 mm. The diameter is adjusted according to the water flow rate. The distance between the drilling position and the initial masonry annular construction joint is greater than 1 m, and the buried depth is not less than 10 cm from the initial support layer 1. The pressure relief hole is drilled using a 28 drill.

[0020] The diameter of the drainage blind pipe 4 is 30-50 mm, and the external insulation layer 5 is made of non-woven fabric and composite insulation material.

[0021] The composite thermal insulation material is a polyurethane thermal insulation material, and the material is made into arc blocks according to on-site requirements.

[0022] The side wall drainage pipe 7 is grooved along the side wall, and the drainage blind pipe 4 is grooved and buried in the primary support layer 1.

[0023] The system is implemented when water seepage is discovered after the initial support construction.

[0024] The construction method of this system is:

[0025] Step 1: Determine the drilling position according to the seepage mileage position of the primary support layer 1. The drilling position should be staggered by 1m from the adjacent primary masonry circumferential construction joint. Drill a pressure relief hole at the bottom of the seepage area 2 of the primary support layer 1 and install a pressure relief steel pipe 3. The diameter of the pressure relief steel pipe 3 is usually 40mm and can be adjusted according to the amount of water inflow. The pressure relief steel pipe 3 is drilled perpendicular to the primary support surface 2 of the seepage area. The pressure relief hole is drilled with a 28 drill. The drilling depth of the pressure relief steel pipe 3 does not exceed the seepage area 2.

[0026] Step 2: The pressure relief steel pipe 3 is connected to the drainage blind pipe 4, and the diameter is 30-100 mm, which can be adjusted according to the amount of water inflow. The connection between the pressure relief steel pipe 3 and the drainage blind pipe 4 is wrapped with non-woven fabric and then coated with plugging material;

[0027] Step 3: The drainage blind pipe 4 is buried by cutting grooves in the primary support layer. When the drainage blind pipe 4 is buried, it is wrapped with an insulation layer 5. The insulation layer 5 is non-woven fabric, polyurethane, and concrete from the inside to the outside;

[0028] Step 4: After the burial is completed, spray-cover the concrete spraying covering layer 6;

[0029] Step 5: Reserve a 30cm drainage blind pipe head at the side wall position, install the side wall drainage pipe 7 at the side wall position for connection during lining construction, and drain the seepage water into the drainage facilities.

[0030] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A drainage system for primary branch local seepage tunnels in high-cold areas, characterized by: It includes a pressure relief steel pipe driven on the primary support layer and a drainage blind pipe buried in the primary support layer. The drilling position of the pressure relief steel pipe is staggered from the adjacent primary masonry circumferential construction joints and maintains a certain distance from the primary masonry circumferential construction joints. One end of the pressure relief steel pipe is connected to the seepage area and is driven perpendicular to the primary support surface of the seepage area. The driving depth of the pressure relief steel pipe does not exceed the seepage area. The other end of the pressure relief steel pipe is connected to the drainage blind pipe. The outside of the drainage blind pipe is wrapped with an insulation layer, and the end is connected to the side wall drainage pipe. The end of the side wall drainage pipe drains to the water storage point and is discharged to the outside of the cave through drainage facilities.

2. The drainage system for primary branch local seepage tunnels in high-cold areas according to claim 1, characterized in that: The pressure relief steel pipe is a steel pipe with a diameter of 30 to 50 mm. The diameter is adjusted according to the water flow rate. The distance between the drilling position and the initial masonry annular construction joint is greater than 1m, and the buried depth is not less than 10cm from the initial support layer. The pressure relief hole is drilled using a 28 drill.

3. The drainage system for primary branch local seepage tunnels in high-cold areas according to claim 1 is characterized by: The diameter of the drainage blind pipe is 30-50 mm, and the external insulation layer is non-woven fabric and composite insulation material.

4. The drainage system for primary branch local seepage tunnels in high-cold areas according to claim 3 is characterized by: The composite thermal insulation material is a polyurethane thermal insulation material, and the material is made into arc blocks according to on-site requirements.

5. The drainage system for primary branch local seepage tunnels in high-cold areas according to claim 1 is characterized by: The side wall drainage pipe is grooved and arranged along the side wall, and the drainage blind pipe is grooved and buried in the primary support layer.

6. A drainage system for primary branch local seepage tunnels in high-cold areas according to any one of claims 1 to 5, characterized in that: The system is implemented when water seepage is discovered after the initial support construction.

Images