Rapid construction method for underground gallery ditch

Abstract

The invention relates to a rapid construction method for an underground gallery ditch, which comprises the following steps of: 1, surveying and setting out, and setting gallery ditch control points and elevation control points; secondly, steel sheet piles are adopted for supporting construction, and a supporting structure is formed; thirdly, earth is excavated in a layered mode, and the earth and supporting structure construction are alternately carried out; fourthly, gallery main body structure construction is conducted, and a bottom plate, wall plates and a top plate are included; and fifthly, after construction of the gallery main body structure is completed, the steel sheet piles are pulled out, and backfilling is conducted. The reasonable construction period of the underground gallery ditch is effectively shortened, the purpose of rapid construction of the underground gallery ditch is achieved, the leakage probability of the gallery ditch can be reduced, the earthwork excavation backfilling workload is greatly reduced, the cost is saved, and meanwhile surrounding ground subsidence and collapse caused by the backfilling quality problem are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of construction of underground structures, and specifically to a rapid construction method for underground corridors. Background Art

[0002] In current industrial structural buildings, underground corridors, as a common structural form for laying various pipelines, play a crucial role. However, with the rapid development of industrial production and the acceleration of urbanization, higher requirements are put forward for the construction quality and efficiency of underground corridors.

[0003] Traditional construction methods for underground corridors usually have the following deficiencies: Backward foundation pit excavation method: In the traditional foundation pit excavation process, the form of slope cutting plus slope protection is often used. This method not only has a long construction period, but also requires a large amount of earth excavation and backfilling work. At the same time, due to the easy disturbance of the surrounding soil during the excavation process, problems such as ground settlement and collapse may occur.

[0004] Complex construction of support structures: During the foundation pit excavation process, complex support structures need to be set up to ensure construction safety. However, the construction process of traditional support structures is cumbersome and requires a large amount of time and labor costs.

[0005] Complicated structural construction process: During the structural construction process, the traditional method usually adopts the three-step construction method of the floor slab, wall panel, and roof slab. This method not only has a long construction period, but also has many construction joints, increasing the risk of leakage. At the same time, due to the close connection between each construction step, once a problem occurs in a certain link, it will affect the overall construction progress and quality.

[0006] Difficult to guarantee backfill quality: Traditional backfilling methods usually use manual or mechanical backfilling, which is difficult to guarantee the compactness and uniformity of the backfill soil. This may lead to problems such as ground settlement and collapse after backfilling, affecting the use effect and safety.

[0007] High leakage risk: During the structural construction process, due to many construction joints and improper treatment, it is easy to cause leakage of the corridor, affecting the use effect and safety.

[0008] Poor economic efficiency: Traditional construction methods are uneconomical, costly, and may cause additional maintenance and reinforcement costs due to long construction periods and backfill quality problems.

[0009] Therefore, a rapid construction method for underground corridors that can shorten the construction period, reduce the amount of earth excavation and backfilling, reduce the leakage risk, and improve economic efficiency is needed. Summary of the Invention

[0010] The present invention aims to overcome the defects of the prior art and provide a rapid construction method for underground corridors to solve the above problems.

[0011] To solve the above technical problems, the present invention is implemented as follows: A rapid construction method for an underground corridor trench, characterized by comprising the following steps: Step 1: Measuring and setting out lines, and setting control points for the corridor trench and elevation control points; Step 2: Carrying out support construction using steel sheet piles to form a support structure; Step 3: Excavating soil in layers, and alternating with the construction of the support structure; Step 4: Carrying out the construction of the main structure of the corridor trench, including the bottom slab, wall panels and top slab; Step 5: After the construction of the main structure of the corridor trench is completed, pulling out the steel sheet piles and carrying out backfilling.

[0012] The rapid construction method for an underground corridor trench described above is characterized in that: Step 2 specifically includes: On the basis of measuring and positioning and setting out lines, carrying out steel sheet pile support construction, and leaving a 50-mm space between the inner edge of the steel sheet pile and the outer edge of the corridor trench.

[0013] The rapid construction method for an underground corridor trench described above is characterized in that: Step 3 specifically includes: Following the principles of supporting first and then excavating, and excavating in layers, using a large excavator to carry out the excavation of the first layer of soil, then installing the support structure, and then carrying out the excavation of the second layer of soil, and so on alternately until the design elevation is reached.

[0014] The rapid construction method for an underground corridor trench described above is characterized in that: Step 4 specifically includes: First carrying out the construction of the bottom slab, setting a construction joint and installing a steel sheet waterstop at a predetermined height above the top surface of the bottom slab; then carrying out the integral pouring construction of the wall panels and the top slab, and using a full hall steel pipe scaffold to support against the top between the two walls.

[0015] The rapid construction method for an underground corridor trench described above is characterized in that: Before pulling out the steel sheet piles, backfill the grooves and gaps of the steel sheet piles with yellow sand to prevent the settlement of the surrounding ground.

[0016] The rapid construction method for an underground corridor trench described above is characterized in that: It also includes the real-time monitoring and evaluation of the construction quality of the main structure of the corridor trench to ensure that the reinforcement effect meets the design requirements.

[0017] The beneficial effects of the present invention are: As can be seen from the above technical solutions, the present application provides a rapid construction method for an underground corridor trench, which can shorten the earth excavation construction period, the main construction period of the corridor trench and the earth backfilling construction period compared with the conventional construction method: greatly reducing the earth excavation and backfilling costs, reducing the risk of leakage of the corridor trench caused by improper setting of construction joints, and reducing the ground settlement and collapse caused by earth backfilling problems.

[0018] The present invention effectively reduces the time for foundation pit excavation and support structure construction by optimizing the construction process and adopting the methods of steel sheet pile support and layered excavation.

[0019] The main structure of the corridor trench is constructed in sections, reducing the amount of concrete poured at one time, thus accelerating the construction progress.

[0020] Accurate measurement and setting out and reasonable design of the support structure minimize the amount of earth excavation.

[0021] Taking advantage of the stability of the steel sheet pile support structure reduces the earth disturbance and backfilling requirements around the foundation pit.

[0022] Before pulling out the steel sheet piles, the gaps are backfilled with yellow sand, which not only ensures the backfilling quality but also reduces the consumption of backfilling materials.

[0023] Construction joints are set on the bottom slab of the corridor trench and steel sheet water stops are installed, effectively preventing the leakage problem caused by cracks in the concrete due to factors such as shrinkage and temperature.

[0024] The wall panels and roof slab of the corridor trench are cast integrally, reducing the number of construction joints and the risk of leakage.

[0025] The use of modern construction equipment and optimized construction techniques improves the construction efficiency and project quality.

[0026] By real-time monitoring and evaluating the construction quality of the main structure of the corridor trench, it is ensured that the reinforcement effect meets the design requirements, improving the overall economic efficiency of the project.

[0027] Accurate measurement and setting out and design of the support structure reduce the disturbance and damage to the surrounding soil.

[0028] Backfilling the gaps with yellow sand avoids problems such as ground settlement and collapse caused by improper backfilling, reducing the impact on the surrounding environment.

[0029] The present invention not only significantly shortens the construction period, reduces the amount of earth excavation and backfilling and costs, reduces the leakage risk, but also improves the construction quality and economic efficiency, and reduces the impact on the surrounding environment, having remarkable beneficial effects. Detailed implementation manners

[0030] The technical solutions of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope claimed by the present application. Embodiment 1 A rapid construction method for an underground corridor trench includes the following steps: Step 1: Measure and set out the lines, set the control points for the corridor trench and elevation control points, providing the positioning and elevation measurement conditions for the construction of the retaining structure, earth excavation, and foundation construction; Step 2: Use steel sheet piles for retaining construction to form the retaining structure; based on the measured positioning and line setting, carry out the steel sheet pile retaining construction, leaving a 50-mm space between the inner edge of the steel sheet pile and the outer edge of the corridor trench. Step 3: Excavate the earth in layers and alternate with the retaining structure construction; follow the principle of "support first and then excavate, excavate in layers", use a large excavator to carry out the first layer of earth excavation, then carry out the installation of the retaining structure, and then carry out the second layer of earth excavation, and so on until the design elevation is reached. Step 4: Carry out the construction of the main structure of the corridor trench, including the floor slab, wall panels, and roof slab; first carry out the floor slab construction, set a construction joint at a predetermined height above the top surface of the floor slab and install a steel sheet waterstop; then carry out the integral pouring construction of the wall panels and the roof slab, and use a full hall of steel pipe scaffolding to support against the top between the two walls. Step 5: After the construction of the main structure of the corridor trench is completed, pull out the steel sheet piles and carry out backfilling.

[0031] Before pulling out the steel sheet piles, backfill the grooves and gaps of the steel sheet piles with yellow sand to prevent the settlement of the surrounding ground.

[0032] Furthermore, it also includes the real-time monitoring and evaluation of the construction quality of the main structure of the corridor trench to ensure that the reinforcement effect meets the design requirements.

[0033] Embodiment 2 The earth excavation follows the principle of "support first and then excavate, excavate in layers". For the upper part, use a large excavator to carry out the first layer of earth excavation, excavating to 2 m below the first layer of the retaining structure; carry out the installation of the first layer of the retaining structure. To avoid affecting the working face of the second layer of earth excavation after the completion of the installation of the first layer of the retaining structure, the second layer of earth excavation and the installation of the first layer of the retaining structure adopt the method of sectional support and small excavator sectional soil excavation to excavate to 5 m below the first layer of the retaining structure; carry out the installation of the second layer of the retaining structure. At the same time, the third layer of earth excavation and the installation of the second layer of the retaining structure adopt the method of sectional support and small excavator sectional soil excavation to excavate to the design elevation. During the earth excavation, clean the soil between the steel sheet piles to prevent it from falling and hurting people when someone enters the foundation pit.

[0034] Embodiment 3 After the earth excavation and support construction are completed, the foundation pit is inspected and the concrete cushion is constructed. The main structure of the corridor trench is divided into two sections vertically, with a transverse construction joint set. The external formwork and the steel sheet piles are filled with rigid foam boards, and the external formwork is not removed and no external scaffold is set up. First, construct the bottom slab of the corridor trench. A construction joint is set 300 mm above the top surface of the bottom slab. A steel sheet waterstop is set at the construction joint, and the notch of the waterstop faces outward. The wall panels and the top slab of the corridor trench are constructed and cast integrally at the same time. A full hall steel pipe scaffold is set inside the corridor trench, and the full hall steel pipe scaffold is used for counter-support between the two walls. When constructing the bottom slab, positioning piles for the support frame are left, and at the same time, when casting, it is evenly cast on both sides along the length direction of the trench. The height difference of the one-time casting of the two side walls is not more than 300 mm, and the length difference of the casting on both sides is not more than 1000 mm to prevent the overall deviation of the support frame caused by the fluidity pressure before the initial setting of the concrete. The side walls are cast in layers as a whole, and the layer height is controlled to be less than 1200 mm, and there is an interval of 45 minutes between layers. After the wall panels of the corridor trench are cast, the top slab of the corridor trench is cast. The wall panels and the top slab of the corridor trench are formed integrally without leaving a construction joint.

[0035] After 7 days of concrete curing for the wall panels and the top slab of the corridor trench, the rebound or the method of testing the strength of the same-condition test blocks is used to detect that the strength reaches 75% of the designed strength value, and the steel sheet pile extraction operation can be carried out. Before extracting the steel sheet piles, the grooves and gaps of the steel sheet piles are backfilled with yellow sand to prevent the surrounding ground from subsiding due to the existence of gaps.

[0036] In this method, the external formwork leans against the steel sheet piles, and the external formwork is not removed and no external scaffold is set up. The internal full hall scaffold is used as the counter-support and top support bracket, effectively utilizing the support frame, while greatly shortening the construction period and the construction cost of setting up the external scaffold, and reducing the earthwork volume in the working surface area of the external scaffold.

[0037] By adopting the construction method of steel sheet pile support and layered excavation, the invention effectively shortens the time for foundation pit excavation and the construction of the support structure. At the same time, the main structure of the corridor trench is constructed by dividing it into two sections vertically and setting a transverse construction joint, reducing the amount of concrete poured at one time, thus accelerating the construction progress. Using a large excavator for the first layer of earth excavation improves the excavation efficiency. During the installation of the support structure and the earth excavation process, the method of sectional support and small excavator sectional soil excavation is adopted to ensure the continuity and high efficiency of the construction surface.

[0038] Furthermore, through precise measurement and setting out and reasonable design of the support structure, the earth excavation volume is minimized to the greatest extent. At the same time, by utilizing the stability of the steel sheet pile support structure, the earth disturbance around the foundation pit and the backfilling requirement are reduced. Before extracting the steel sheet piles, the grooves and gaps of the steel sheet piles are backfilled with yellow sand to prevent the surrounding ground from subsiding due to the existence of gaps. This method not only ensures the backfilling quality but also reduces the usage amount of the backfill soil.

[0039] Furthermore, a construction joint is set 300 mm above the top surface of the corridor trench bottom slab, and a steel plate waterstop is installed. This design effectively prevents the leakage problem caused by cracks in the concrete due to factors such as shrinkage and temperature. The corridor trench wall panels and the top slab are constructed simultaneously and poured integrally, reducing the number of construction joints. At the same time, by controlling the height difference and length difference of the one-time pouring of the two side walls, the overall offset of the support frame caused by the fluidity pressure before the initial setting of the concrete is prevented, thereby reducing the leakage risk.

[0040] Furthermore, by means of measures such as optimizing the construction process, reducing the amount of earth excavation and backfilling, and reducing the leakage risk, the construction cost is effectively reduced. At the same time, the internal full hall formwork is used as the opposite support and top support bracket, avoiding the construction cost of erecting the external scaffolding. The use of modern construction equipment and optimized construction techniques significantly improves the construction efficiency. This not only shortens the construction period but also improves the project quality, thereby increasing the economic benefits of the project.

[0041] In summary, through measures such as optimizing the construction process, reducing the amount of earth excavation and backfilling, reducing the leakage risk, and increasing the economic benefits, the present invention effectively solves the technical problems existing in the traditional construction method of underground corridor trenches.

[0042] The above are only the embodiments provided by this application and are not used to limit this application. Although this application has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A rapid construction method for underground corridors and trenches, characterized in that: The steps include: Step 1: Measure and lay out, set up corridor control points and elevation control points; Step 2: Use steel sheet piles for support construction to form a support structure; Step 3: Excavate the earth in layers, alternating with the construction of the supporting structure; Step 4: Carry out the main structure construction of the corridor, including the bottom plate, wall plate and top plate; Step 5: After the main structure of the corridor is completed, remove the steel sheet piles and backfill.

2. The underground gallery rapid construction method according to claim 1 is characterized by: Step 2 specifically includes: Based on the measurement, positioning and layout, steel plate support construction is carried out, and a 50mm space is left between the inner edge of the steel sheet pile and the outer edge of the corridor ditch.

3. The underground gallery rapid construction method according to claim 1 is characterized by: Step three specifically includes: following the principle of supporting first and then excavating, and excavating in layers, using a large excavator to excavate the first layer of earth, then installing the support structure, and then excavating the second layer of earth, alternating in this way until the design elevation is reached.

4. The underground gallery rapid construction method according to claim 1 is characterized by: Step four specifically includes: firstly carry out the base plate construction, set the construction joint at a predetermined height above the top surface of the base plate and install the steel plate water stop; then carry out the integral casting construction of the wall panel and the top plate, and use the full-height steel pipe scaffolding to support the top between the two walls.

5. The underground gallery rapid construction method according to claim 1 is characterized by: Before removing the steel sheet piles, fill the gaps in the grooves of the steel sheet piles with yellow sand to prevent the surrounding ground from sinking.

6. A rapid construction method for underground gallery trench according to any one of claims 1 to 5, characterized in that: It also includes real-time monitoring and evaluation of the construction quality of the main structure of the corridor to ensure that the reinforcement effect meets the design requirements.