Adjustable grouting reinforcement construction method in fracture zone stratum pipe jacking construction

Abstract

The invention relates to an adjustable grouting reinforcement construction method in fracture zone stratum pipe jacking construction. The adjustable grouting reinforcement construction method comprises the steps that firstly, a grouting floral tube capable of being spliced is prepared; 2, before grouting, detailed drilling and grouting pipe installation work is conducted, specifically, thick slurry is injected between the fracture zone and the steel pipe to form a preliminary protection layer, a hole is formed in the steel pipe to serve as a grouting hole and a starting point of the hole, drilling is conducted through the hole in the steel pipe, and a grouting floral pipe is machined and manufactured and bolted and installed; thirdly, a connecting pipe is installed; fourthly, a water stop ring is welded to the tail end of the floral tube, a rubber plug is installed above the water stop ring, and meanwhile a closing plate is welded to the lower portion of the steel tube and used for being connected with a follow-up connecting tube; and fifthly, grouting reinforcement is conducted through the grouting floral tube and the connecting tube which can be spliced. The grouting reinforcement effect is improved, the soil stability and bearing capacity of the crushed zone are enhanced, the cost is reduced, the resource utilization rate is increased, and the construction safety and controllability are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, in particular to an adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone stratum. Background Art

[0002] During pipe jacking, when the construction route passes through a fractured zone with complex geological conditions, soil stability and bearing capacity become major challenges to construction safety. The soil in the fractured zone is loose and prone to collapse, making traditional grouting reinforcement methods ineffective, posing a significant safety hazard to pipe jacking operations.

[0003] Traditional grouting reinforcement methods mainly rely on grouting on the surface or at specific locations, and grouting pipes are usually not inserted, which leads to many defects. First, the grouting range is limited. Due to the lack of guidance from the grouting pipe, it is difficult for the slurry to be evenly distributed throughout the broken zone. There are many blind spots in the grouting, and the reinforcement effect is uneven. Secondly, the grouting pressure and grouting volume are difficult to control accurately. Traditional methods lack the means to dynamically adjust the grouting pressure in stages and accurately control the grouting volume, which can easily lead to insufficient or excessive grouting, affecting the reinforcement effect. In addition, the slurry backflow problem is also a difficult problem in traditional grouting methods. After grouting, the slurry may flow back from the grouting holes or cracks, resulting in uneven thickness and reduced strength of the reinforced layer. Finally, the length and position of the grouting pipe are not adjustable. The length and position adjustment of the grouting pipe in the traditional method are limited, and it is impossible to adapt to broken zones of different depths and bypass obstacles, which affects construction efficiency and reinforcement effect. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provide an adjustable grouting reinforcement construction method in pipe jacking construction in a broken zone stratum, so as to solve the problem of soil reinforcement in the broken zone during pipe jacking construction.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: An adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone stratum is characterized in that it comprises the following steps: Step 1: Prepare a splicable grouting flower pipe, which is made of high-strength, corrosion-resistant anchor rods and can be spliced ​​in length according to actual needs; Step 2: Before grouting, detailed drilling and grouting pipe installation work is carried out, including injecting thick mud between the broken zone and the steel pipe to form a preliminary protective layer, opening holes on the steel pipe as the starting point for grouting holes and drilling, drilling through the holes on the steel pipe, processing and making grouting flower pipes and bolting them for installation; Step 3: Install the connecting pipe and remove it for recycling after grouting is completed; Step 4: Weld a water stop ring at the end of the flower pipe and install a rubber plug on the water stop ring. At the same time, weld a blanking plate under the steel pipe for connecting the subsequent connecting pipes. Step 5: Use the spliced ​​grouting flower pipes and connecting pipes to reinforce the grouting to ensure that the grouting range is wide and uniform. At the same time, the design of water stop rings and baffles is used to prevent the slurry from flowing back.

[0006] The adjustable grouting reinforcement construction method in the jacking pipe construction in the broken zone formation is characterized in that the spliced ​​grouting flower pipes are extended by bolting to meet the requirements of different lengths, thereby improving the flexibility and controllability of the grouting process.

[0007] The adjustable grouting reinforcement construction method in the top pipe construction of the broken zone formation is characterized in that: the water stop ring is welded at the end of the flower pipe and has a diameter of 75 mm. A rubber plug is installed above the water stop ring. The blind plate is welded under the steel pipe and has internal threads for connecting subsequent connecting pipes to prevent slurry backflow during the grouting process and improve grouting efficiency and sealing.

[0008] The adjustable grouting reinforcement construction method in the top pipe construction of the broken zone formation is characterized in that: the detailed drilling and grouting pipe installation work includes: injecting thick mud between the broken zone and the steel pipe to form a preliminary protective layer to reduce the risk of soil collapse during the drilling process; opening a 90mm hole on the steel pipe as the starting point of the grouting hole and drilling; using special equipment to drill through the holes on the steel pipe, the hole diameter is 50mm, and the hole depth and spacing are comprehensively considered according to geological conditions, rock properties, water pressure and other factors; processing and manufacturing grouting flower pipes and bolting them for installation; installing the connecting pipe, and performing annular grouting before installation to ensure that the gap between the steel pipe and the broken zone is filled.

[0009] The adjustable grouting reinforcement construction method in the jacking pipe construction in the fractured zone stratum is characterized in that the grouting material is selected from resin or mortar.

[0010] The adjustable grouting reinforcement construction method in the jacking construction of the fractured zone formation is characterized by: after the grouting is completed, the connecting pipe is removed; the grouting hole is sealed and a thixotropic mud one-way valve is installed at the hole; and the steel pipe is repaired to ensure the safety of subsequent construction.

[0011] The beneficial effects of the present invention are as follows: It can be seen from the above technical solution that the present application provides an adjustable grouting reinforcement construction method in the top pipe construction of the broken zone stratum. By introducing technical means such as splicable grouting flower pipes and connecting pipe recovery mechanisms, the effect of grouting reinforcement is improved, the construction cost is reduced, and the construction safety and controllability are enhanced. The splicable grouting flower pipes can be adjusted in length as needed to adapt to broken zones of different depths. At the same time, the small hole design on the grouting flower pipes enables the slurry to be evenly injected into the stratum, thereby improving the reinforcement effect. The connecting pipe recovery mechanism reduces material waste and reduces construction costs. In addition, the method also effectively prevents the occurrence of slurry backflow problems by precisely controlling the grouting pressure and grouting volume, thereby improving construction safety and controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the present application. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection requested by this application. like Figure 1 As shown: A construction method for adjustable grouting reinforcement in pipe jacking construction in a fractured zone stratum, which comprises the following steps: 1. Construction Preparation 1. Equipment Preparation: (1) Drilling rig: Use a drilling rig. The specific model should be selected according to the geological conditions and construction requirements.

[0014] (2) Grouting pump: Use a high-pressure grouting pump, such as the ZBQS series pneumatic dual-liquid grouting pump, to ensure precise control of grouting pressure and grouting volume.

[0015] (3) Air compressor: provides the pneumatic power required during the grouting process. The model is selected according to the needs of the grouting pump.

[0016] 2. Material preparation: (1) Grouting pipe: Use high-strength, corrosion-resistant anchor rods, and splice the length according to actual needs to ensure that the length of the grouting pipe is adjustable.

[0017] (2) Water-stop rubber plug: Made of high-performance rubber material, it has good elasticity and sealing performance to ensure that the slurry will not leak during the grouting process.

[0018] (3) Waterstop steel ring: Made of high-quality steel, it has high strength and corrosion resistance.

[0019] (4) Grouting materials: Select appropriate grouting materials according to project requirements.

[0020] 2. Construction steps Step 1: Preparation and Grouting (1) Inject thick mud between the broken zone and the steel pipe to form a preliminary protective layer.

[0021] (2) A 90mm hole is opened on the steel pipe as the starting point for grouting holes and drilling.

[0022] (3) Use special equipment to drill holes through the steel pipes with a hole diameter of 50 mm. The hole depth and spacing are comprehensively considered based on geological conditions, rock properties, water pressure and other factors to ensure that they meet the design requirements.

[0023] Phased problem solving and benefits: This step is the preparatory work before grouting reinforcement, ensuring the accurate location of the grouting holes, the thick mud providing initial protection, and reducing the risk of soil collapse during the drilling process.

[0024] Step 2: Production and installation of grouting flower tubes (1) Process and manufacture grouting flower pipes. The flower pipes are extended by bolting to meet the needs of different lengths and then installed.

[0025] (2) A 75mm diameter water stop ring is welded to the end of the flower tube, a rubber plug is installed above the water stop ring, and the end of the flower tube is threaded and connected to the subsequent connecting pipe to ensure sealing.

[0026] (3) A blanking plate is welded under the steel pipe, and threads are threaded inside the blanking plate for connecting subsequent connecting pipes.

[0027] (4) Install the connecting pipe. Before installation, perform annular grouting to ensure that the gap between the steel pipe and the broken zone is filled. The connecting pipe is connected to the end of the flower pipe and the blanking plate respectively.

[0028] Phased problem solving and benefits: The production and bolted installation of the flower pipe ensure the controllability and flexibility of the grouting process. The design of the water stop ring and the baffle effectively prevents the slurry from flowing back during the grouting process, thereby improving the grouting efficiency.

[0029] Step 3: Grouting reinforcement and subsequent treatment (1) Grouting reinforcement is carried out through the flower tube. The grouting material can be resin or mortar, which is selected according to the actual situation of the project.

[0030] (2) After grouting is completed, remove the connecting pipe.

[0031] (3) Seal the grouting holes and install a thixotropic mud one-way valve at the holes.

[0032] (4) Repair the steel pipes to ensure the safety of subsequent construction.

[0033] Phased problem solving and benefits: Grouting reinforcement enhances the stability and bearing capacity of the soil in the broken zone, the recycling of connecting pipes reduces costs, and the sealing of grouting holes and repair of steel pipes ensure the safety and continuity of construction.

[0034] Related calculations: 1. Calculate the ground settlement caused by tunnel excavation and the amount of reinforcement slurry injected Peck formula: in: S(x): settlement at horizontal distance x from the tunnel axis (mm); V: Volume loss per unit length of tunnel ( / m); i: width parameter of the settlement trough (m), usually i=(0.5∼0.7)*z0 (z0 is the tunnel depth); exp: natural exponential function 2. Mud pool volume algorithm Calculation formula: The volume of the mud pool needs to take into account parameters such as pile diameter, pile length and sand layer thickness. The specific calculation formula is as follows: in: V: Design volume of mud pool (m 3 ); d: pile diameter (m); L: pile length (m); S: Sand layer distribution cross-sectional area (m 2 ), which can be calculated according to the actual distribution range of the sand layer; h: thickness of sand layer (m); K: Volume coefficient (range: 1.2~1.5), mainly used to consider mud loss, hole wall penetration and construction safety margin. A larger value is taken when the sand layer is highly permeable.

[0035] 3. Drilling parameters of rotary drilling rig and positive circulation drilling rig are based on: (1) Rotary drilling rig a) Drilling speed: 1~3m / min Geological conditions: When the soil layer in the broken zone is loose, the speed should be low (1~2m / min); when the hard plastic soil layer is hard plastic soil, the speed can be increased to 2~3m / min; Equipment performance: Drilling rigs with a power of ≥280kW can be adapted to higher speeds to avoid excessive wear of the drill bit.

[0036] b) Speed: 8~12r / min Influence of pile diameter: When the pile diameter is greater than 1.5m, the rotation speed should be 8~10r / min to prevent the hole wall from collapsing due to centrifugal force; - Slag discharge efficiency: In conjunction with the mud circulation system, too low a rotation speed can easily cause sediment accumulation.

[0037] c) Axial pressure: 80~120kN Soil bearing capacity: When the compressive strength of the soil in the broken zone is ≤150kPa, the pressure should be controlled at 80~100kN; - Drill bit type: For pick drill bits, the higher value is 100~120kN, and for roller drill bits, the lower value is 100~120kN.

[0038] (2) Positive circulation drilling rig a) Drilling speed: 0.5~1.5m / min Sand layer thickness: When the sand layer accounts for more than 30%, the speed should be ≤1m / min to prevent quicksand; - Mud density: When the density is 1.1~1.3, it can be increased to 1~1.5m / min.

[0039] b) Pump capacity: 40~80m³ / h Aperture size: For apertures between 1 and 1.2 m, the pump rate is 40 to 60 m³ / h; for apertures above 1.5 m, the pump rate is 60 to 80 m³ / h. - Slag discharge requirements: In the sand layer section, the pump rate must be ≥ 60 m³ / h to avoid clogging by sediment.

[0040] c) Mud pressure: 0.2~0.4MPa Groundwater level: When the water level is less than 5m deep, the pressure is controlled at 0.3~0.4MPa to prevent water gushing; - Impact of hole depth: When the hole depth is greater than 50m, the pressure increases by 0.05MPa for every 10m increase.

[0041] The present invention adopts a splicable grouting flower pipe, the length of which can be flexibly adjusted according to the actual project conditions; a water stop ring and a blocking plate are added to improve the sealing and controllability of the grouting process; and a connecting pipe recovery mechanism is introduced to reduce costs.

[0042] Detailed drilling and grouting pipe installation work was carried out before grouting to ensure the accuracy and uniformity of grouting; after grouting was completed, the grouting holes were sealed and the steel pipes were repaired to ensure the safety and integrity of the construction; the effect of grouting reinforcement was improved, and the stability and bearing capacity of the soil in the broken zone were enhanced; costs were reduced, resource utilization was improved, and the safety and controllability of the construction were enhanced.

[0043] After grouting is complete, the present invention removes the connecting pipe, enabling its recycling and reducing costs. Furthermore, by precisely controlling the grouting process, insufficient or excessive grouting is avoided, reducing material waste and further lowering construction costs. Furthermore, the present invention's detailed and efficient construction procedures reduce construction time and labor intensity, improve construction efficiency, and indirectly reduce the company's operating costs.

[0044] During construction, concentrated slurry was injected between the fracture zone and the steel pipe to form a preliminary protective layer, reducing the risk of soil collapse during drilling. After the grouting holes were sealed, a thixotropic slurry check valve was installed to ensure sealing and safety after grouting. Furthermore, precise control of technical parameters such as drilling speed, rotational speed, axial pressure, pump volume, and slurry pressure ensured stability and safety during the drilling and grouting process, reducing construction risks.

[0045] The construction process is detailed and efficient, and precise control and flexibility of the grouting process are achieved through technical means such as the splicable grouting flower pipe and water stop ring. After the grouting is completed, the grouting holes are sealed and the steel pipes are repaired, ensuring the safety and continuity of the construction. Furthermore, the construction method of the present invention is easy to operate, highly efficient, applicable to various complex geological conditions, and can significantly shorten the construction period.

[0046] The present invention solves the technical problems mentioned in the background technology comprehensively from multiple aspects such as the flexibility of the grouting pipe, the controllability of the grouting process, the prevention of slurry backflow and the control of costs; improves construction efficiency and quality, reduces safety risks; enhances the stability and bearing capacity of the soil in the broken zone, and provides a solid guarantee for pipe jacking construction; reduces costs and improves economic benefits; and has wide applicability and promotion value.

[0047] The above are only embodiments provided for this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. An adjustable grouting reinforcement construction method in pipe jacking construction in a broken zone stratum, characterized in that It includes the following steps: Step 1: Prepare a splicable grouting flower pipe, which is made of high-strength, corrosion-resistant anchor rods and can be spliced ​​in length according to actual needs; Step 2: Before grouting, detailed drilling and grouting pipe installation work is carried out, including injecting thick mud between the broken zone and the steel pipe to form a preliminary protective layer, opening holes on the steel pipe as the starting point for grouting holes and drilling, drilling through the holes on the steel pipe, processing and making grouting flower pipes and bolting them for installation; Step 3: Install the connecting pipe and remove it for recycling after grouting is completed; Step 4: Weld a water stop ring at the end of the flower pipe and install a rubber plug on the water stop ring. At the same time, weld a blanking plate under the steel pipe for connecting the subsequent connecting pipes. Step 5: Use the spliced ​​grouting flower pipes and connecting pipes to reinforce the grouting to ensure that the grouting range is wide and uniform. At the same time, the design of water stop rings and baffles is used to prevent the slurry from flowing back.

2. The adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone according to claim 1 is characterized by: The splicable grouting flower pipes are extended by bolting to meet the requirements of different lengths, thereby improving the flexibility and controllability of the grouting process.

3. The adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone according to claim 1 is characterized by: The water stop ring is welded at the end of the flower pipe and has a diameter of 75mm. A rubber plug is installed above the water stop ring. The blocking plate is welded under the steel pipe. The blocking plate has internal threads and is used to connect subsequent connecting pipes to prevent slurry backflow during the grouting process and improve grouting efficiency and sealing.

4. The adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone according to claim 1 is characterized by: The detailed drilling and grouting pipe installation work includes: injecting thick mud between the broken zone and the steel pipe to form a preliminary protective layer to reduce the risk of soil collapse during the drilling process; opening a 90mm hole on the steel pipe as the starting point for the grouting hole and drilling; using special equipment to drill through the holes on the steel pipe, the hole diameter is 50mm, and the hole depth and spacing are comprehensively considered based on geological conditions, rock properties, water pressure and other factors; processing and manufacturing grouting flower pipes and bolting them for installation; installing the connecting pipe, and performing annular grouting before installation to ensure that the gap between the steel pipe and the broken zone is filled.

5. The adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone according to claim 1 is characterized in that: The grouting material is selected from resin or mortar.

6. The adjustable grouting reinforcement construction method in pipe jacking construction in a fractured zone according to claim 1 is characterized by: After the grouting is completed, the connecting pipe is removed; the grouting hole is sealed and a thixotropic mud one-way valve is installed at the hole; the steel pipe is repaired to ensure the safety of subsequent construction.

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