A filling bag for construction of multi-cabin ground-connected wall joints and a construction method thereof

Abstract

The present invention discloses a filling bag and construction method for multi-chamber ground-connected wall joint construction, the filling bag includes an outer bag and an expansion bag arranged in the outer bag, a plurality of the expansion bags divide the inner part of the outer bag into a plurality of sealed chambers, the top of the filling bag is equipped with an inlet and outlet valve at the water inlet, a pressure sensor is also installed at the top, and a drain valve is installed at the water outlet at the bottom, the method includes S1, using a loading device to load the filling bag with pressure; S2, using a pressure sensor, a flow meter, a digital display screen and an audible and visual alarm to cooperate with an external control system to monitor the pressure; S3, after the initial setting of the concrete, the bag is pressure-unloaded, and the bag is hoisted out of the hole while the remaining sewage is discharged through the drain valve. The filling bag and construction method of the present invention are used for the construction filling of the joint space of the underground continuous wall construction, and are widely used to replace traditional processes such as throwing sandbags, locking tubes, and joint boxes, and have the advantages of simple and fast construction, low cost, and the ability to be recycled.

Description

Technical Field

[0001] The invention relates to the technical field of underground continuous wall construction, and in particular to a filling bag for construction of a multi-cabin underground continuous wall joint and a construction method. Background Art

[0002] With the acceleration of urbanization, urban land resources are scarce, and a large amount of building space needs to be extended underground, especially rail transit and large shopping malls, office buildings, parking lots, etc. Underground continuous wall is one of the most suitable construction solutions for underground space construction, with fast construction speed, stable quality, good safety and reasonable cost. Underground continuous wall construction is generally constructed into a groove of a certain width and depth by double-wheel milling or slotting machine according to design requirements, and the width is generally 3-6 meters; then reinforced concrete is poured to form an underground wall, and a wall is formed by connecting one section after another. In order to prevent water leakage at the joints between walls, underground continuous wall joints generally use I (cross) steel embedded parts to form concave and convex construction grooves. Each time the construction is carried out, the concave and convex grooves must first be temporarily filled with sandbags, conduits, and joint boxes. After the concrete solidifies, the filler is withdrawn to form a water-stop groove for the next wall. The most mature and most used filling measure is still throwing sandbags. The bagging and throwing of a construction requires more than 10 people for one day, and a large number of machines are used, which is time-consuming and labor-intensive. Steel sleeve boxes and lock pipes are also used, but the depth is limited.

[0003] Many domestic and foreign institutions and construction units have studied the underground continuous wall joint filling construction technology:

[0004] Authorization announcement number CN104278697B, the mud bag for filling the underground continuous wall head space proposed in the scheme is made of vulcanized rubber and fiber reinforcement layer, the mud bag cross-section is trapezoidal, the mud enters and exits at the bottom, etc.; in actual use, all design defects are exposed, the mud bag is made of vulcanized rubber and fiber reinforcement layer, after pressurization, the elastic deformation changes with the pressure, the underground continuous wall steel cage is squeezed and displaced, the concrete bypasses after the pressure of the bag is small, and the concrete runs into the space that needs to be filled; the mud is opened when entering and exiting the lower trough through the bottom valve, and closed when falling to the bottom. In actual operation, the operation is inconvenient and the sealing is not strict. After the concrete bypasses, the bag cannot be taken out. As a result, the concrete bypass cannot be cleared, the steel cage of the next wall cannot be installed according to the designed position, and the subsequent joints leak. Afterwards, it costs a huge price to deal with and delay the progress of the project, leaving serious hidden dangers;

[0005] Although the flexible liquid capsule used to seal the end space of the underground continuous wall of application announcement number CN110424374A / CN110424375A adopts a multi-layer structure, its design is a Kevlar liner plus a vulcanized layer. According to its description, the Kevlar liner only serves to increase strength, wear resistance and tear resistance, and the outer layer is still made of rubber and fiber, rubber cord cloth, or rubber, fiber and cord cloth; in actual use, the friction and pressure of the capsule are mainly between the capsule surface and the groove wall. Kevlar installed inside cannot achieve the expected strength, wear resistance and tear resistance. The support assembly installed in the capsule also increases the difficulty of operation. The stress state and degree between the capsule and the support assembly are difficult to grasp; the scheme proposes that the pouring speed cannot exceed 6 meters / hour, and the construction time of a 40-meter-deep wall is increased by 2-4 times compared with the original; the scheme proposes an alarm pressure of 2.6 kilograms, and the filling capsule generally has a volume of 10-100 cubic meters, and its actual instantaneous pressure reaches more than 4 kilograms, which puts high requirements on the design and processing materials of the capsule.

[0006] The traditional rubber bag in the above scheme is formed by gluing the cord or cord cloth with glue and then vulcanizing it as a whole. The pressure-bearing capacity depends on the friction between the materials. The greater the pressure, the thicker the material bonding, the more inconvenient the operation. At the same time, the elastic deformation greatly affects the construction effect.

[0007] The construction procedure of underground continuous wall is to first use trenching equipment to dig a deep trench underground according to the design, lower the steel cage and then pour concrete. Due to the complex geological conditions, the surface of the trench will be rough with sharp objects, collapsed holes, and uneven local sizes after trenching. At this time, the filling bag needs to have strength, rigidity, and flexibility when retracted and released; the strength of the bag can withstand the friction and extrusion of the walls and steel cages inside the underground continuous wall under complex geological conditions, as well as the impact pressure of concrete pouring. Due to the use of mud wall protection technology, the mud density is about 1.2. When water is used in the bladder, there will be a pressure difference. According to theoretical calculations and actual on-site experience, the pressure difference is 0.2 kg for every 10 meters. A 40-meter wall requires 0.8 kg to maintain the internal and external balanced pressure, and the bladder does not float up. Add 1 kg of working pressure, so the pressure in the 40-meter-long bladder is added to 2 kg to be the safe starting working value. The actual on-site pouring speed of underground continuous wall concrete is generally 10-20 cubic meters / hour. The instantaneous pressure generated during actual pouring and pipe pulling exceeds 4 kg, so the material must have a certain strength; the stiffness of the bladder requires very low elastic deformation of the bladder, which puts forward new requirements for materials and processing methods; because the space to be filled is small, the bladder needs to have good flexibility to facilitate folding into a smaller size to enter and exit the space. Taking the 800 underground continuous wall as an example, the I-beam at the end of the steel cage is 630×250, and the I-beam plus over-excavation is generally only 630×500. Unfavorable factors have not been considered. If the bladder is too large, it will not be able to be lowered;

[0008] First of all, it is definitely a very good solution to use filling capsules instead of other methods to fill the underground continuous wall joint space. However, according to the site needs, the filling capsule diameter is between 0.6-1.5 meters, the outer capsule length is between 20-120 meters, the volume is between 10-100 cubic meters, and the working pressure is more than 4 kilograms, which puts strict requirements on the filling capsule. The underground continuous wall joint filling capsule needs to solve the following problems to be successfully used:

[0009] 1) First of all, the quality of the filling capsule must be 100% reliable, the construction time is shorter than the original plan, and the construction cost is comparable to the original;

[0010] 2) It can overcome the impact of various complex working conditions on the safety and installation of the bag due to the deviation of size and verticality after the underground continuous wall joint space is grooved, the roughness of the groove wall with sharp objects, collapsed holes, and silt accumulation at the bottom;

[0011] 3) The capsule must have a sufficiently high pressure bearing capacity and a relatively long and stable service life;

[0012] 4) Simple and practical operation, convenient and quick installation and removal;

[0013] 5) There must also be a complete set of safety inspection plans and construction techniques. Summary of the invention

[0014] The present invention provides a filling bag for constructing a multi-compartment ground-connected wall joint. The outer bag is divided into a plurality of independently sealed compartments by an expansion bag connected in series inside the outer bag, thereby improving reliability. The present invention also provides a construction method for a multi-compartment ground-connected wall joint.

[0015] To achieve the above object, the present invention adopts the following technical solutions:

[0016] A filling bag for the construction of a multi-chamber ground-connected wall joint comprises an outer bag and an expansion bag arranged inside the outer bag. The plurality of expansion bags divide the interior of the outer bag into a plurality of sealed chambers. The top of the filling bag is provided with water inlet and outlet valves at the water inlet, the top is also provided with a pressure sensor, and the bottom is provided with a sewage valve at the water outlet.

[0017] As a preferred embodiment of the above scheme, a plurality of the expansion bags are connected in series via a connecting tube and are fixedly installed inside the outer bag.

[0018] As a preferred embodiment of the above scheme, a through tube is provided in the expansion bladder, the through tube passes through the two side walls of the expansion bladder and is sealed with the expansion bladder, an electromagnetic valve is installed on the top of the through tube, and the initial pressure of the expansion bladder is greater than 1.5 times the working pressure of the outer bladder.

[0019] As a preferred embodiment of the above solution, a detachable digital display screen and an audible and visual alarm are installed on the filling bag, and the digital display screen and the audible and visual alarm are electrically connected to the pressure sensor.

[0020] As a preferred embodiment of the above scheme, the inlet and outlet water valves include an outer bag inlet and outlet water valve and an expansion bag inlet and outlet water valve, which are respectively arranged at the top of the outer bag and the expansion bag, and the drain valve includes an outer bag drain valve and an expansion bag drain valve, which are respectively arranged at the bottom of the outer bag and the expansion bag.

[0021] As a preferred embodiment of the above scheme, the outer bag includes an inner liner and a skeleton layer. The skeleton layer is sleeved outside the inner liner and connected to the inner liner at both ends through a flange group. A reinforcement layer and a shaped steel sand bag are respectively installed on the top and bottom between the inner liner and the skeleton layer, and a wear-resistant coating is coated on the outside of the skeleton layer.

[0022] As a preferred embodiment of the above solution, a hanging screw is installed on the inner liner, and the hanging screw passes through the reinforcement layer and the skeleton layer and extends to the outside of the filling bag.

[0023] As a preferred embodiment of the above scheme, the inner liner is made of PVC coated cloth or TPU coated cloth; the skeleton layer is made of a braided tube or a braided belt crisscrossed to form a ring tube; and the wear-resistant coating is made of polyurea.

[0024] As a preferred embodiment of the above scheme, the flange group includes an inlet and outlet water flange group arranged at the top of the outer bladder and a sewage discharge flange group at the bottom, the inlet and outlet water flange group is installed with an outer bladder inlet and outlet water valve and an expansion bladder inlet and outlet water valve, and the sewage discharge flange group is installed with an outer bladder sewage discharge valve and an expansion bladder sewage discharge valve.

[0025] A multi-cabin ground-wall joint construction method comprises the following steps:

[0026] S1. Pressure loading of filling bladder: After completing technical briefing and construction preparation, the filling bladder is hoisted into the hole to be constructed in the underground continuous wall joint space and pressure loaded. The water inlet and outlet valves on the bladder top are connected to a water pump, which is connected to an external water source. The water pump is used to inject water into the outer bladder and the expansion bladder respectively. A flow meter is installed on the outlet pipeline of the water pump, which is connected to the main controller of the external control system to control the capacity and pressure of the filling bladder.

[0027] S2, filling bag pressure monitoring: the pressure sensor, digital display screen and sound and light alarm are connected to the main controller and the remote monitoring terminal respectively. The pressure sensor collects the pressure of the outer bag and the expansion bag in real time and transmits it to the main controller and / or the remote monitoring terminal, and displays and records the filling bag pressure state parameters. When the filling bag pressure reaches the preset value, the main controller and / or the remote monitoring terminal controls the digital display screen and the sound and light alarm to sound and light alarm;

[0028] S3. Unloading of filling bag pressure: 4-8 hours after the completion of underground continuous wall concrete pouring and after the initial setting of concrete is confirmed by probe detection, the expansion bag is first depressurized. The expansion bag is discharged for 5-10 minutes and then the outer bag is discharged. The water in the filling bag is naturally discharged under the pressure difference between the inside and the outside, and the space outside the bag is replenished with mud at the same time. When draining water, a flow meter is used to detect the water output. When the bag is hoisted out of the hole, the remaining sewage is discharged through the drain valve.

[0029] As a preferred embodiment of the above scheme, the sound and light alarm described in step S2 specifically includes:

[0030] The on-site digital display screen and remote monitoring terminal synchronously display the real-time pressure values ​​of the outer bag and the expansion bag, and the sound and light alarm is activated according to the set pressure value;

[0031] The pre-pressure value of the expansion bag is 3 kg;

[0032] The pre-pressure value of the outer bag of the filling bag is 2 kg;

[0033] When the outer bag pressure value of the filling bag is 2-3 kg, the indicator light turns green and pouring can be done normally;

[0034] When the outer bag pressure value of the filling bag reaches between 3-4 kg, the indicator light turns yellow and an alarm sounds to remind you to slow down the concrete pouring speed;

[0035] When the outer bag pressure value of the filling bag is >4 kg, the indicator light turns red and the alarm sounds, warning you to stop pouring concrete immediately. When the pressure value drops to 3 kg, start pouring concrete or pour concrete intermittently.

[0036] Due to the above structure, the beneficial effects of the present invention are:

[0037] 1. The multi-cabin ground-connected wall joint construction filling bag and construction method of the present application are used for the construction filling of underground continuous wall construction joint space, and are widely used to replace traditional processes such as throwing sandbags, locking pipes, and joint boxes. It has the advantages of simple and fast construction, low cost, and recyclable use;

[0038] 2. The filling bag is divided into multiple independent and sealed compartments. Even if a compartment is damaged, only the single compartment will be depressurized. Since both ends of the pressure relief section are firmly clamped by the expansion bag, most of the concrete can still be prevented from bypassing, and the filling effect of other compartments will not be affected, thereby improving the safety and reliability of the filling bag. The expansion bag is small in size and has a strong pressure-bearing capacity. After being segmented, the pressure borne by the original entire bag is changed to that borne by segments, which is similar to the working principle of rails and sleepers. It is consistent with the pressure and impact force curve of the pouring side during concrete pouring, reducing the requirements for the overall material and further improving reliability.

[0039] 3. The outer bag has a multi-layer structure with distinct functions. In particular, the skeleton layer uses the existing super-large diameter braided tube. The overall weaving has both strength and density, and can effectively prevent puncture. Its own rated pressure can reach 4 kg and the bursting pressure can reach 9 kg, providing the bag with more than 2 times the safety factor. At the same time, the replaceable liner can ensure the safe use of the product and effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic structural diagram of a filling bag for a multi-compartment underground continuous wall joint according to a first embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the construction of underground continuous wall joint space using a filling bag according to the present invention;

[0042] Figure 3 This is a schematic structural diagram of a filling bag for a multi-cabin underground continuous wall joint according to a third embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the top structure of a filling bag for a multi-cabin underground continuous wall joint according to a third embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the bottom structure of a filling bag for a multi-cabin underground continuous wall joint according to a third embodiment of the present invention;

[0045] Figure 6 This is a structural arrangement diagram of the skeleton layer of the filling bag of the multi-cabin underground continuous wall joint of the third embodiment of the present invention;

[0046] Figure 7 It is a cross-sectional schematic diagram of the skeleton layer of the filling bag of the multi-compartment underground continuous wall joint in Example 3 of the present invention. DETAILED DESCRIPTION

[0047] Embodiment 1:

[0048] like Figure 1 , Figure 2 As shown, this embodiment provides a multi-compartment underground continuous wall joint filling bag. According to actual needs on site, the filling bag has a diameter between 0.6-1.5 meters and a length between 20-120 meters. Most sizes are 0.8 meters and 1 meter in diameter and 30-60 meters in length.

[0049] The filling capsule includes an outer capsule 1 and an expansion capsule 2 disposed inside the outer capsule 1. A plurality of the expansion capsules 2 are connected in series through a connecting pipe 3 and fixedly installed inside the outer capsule 1, dividing the inside of the outer capsule 1 into a plurality of sealed compartments 11 to form a series multi-compartment capsule. The top of the filling capsule is provided with an inlet and outlet valve at the water inlet, a pressure sensor 4 is also (detachably) installed at the top, and a drain valve is installed at the water outlet at the bottom.

[0050] In this embodiment, the outer bag 1 is a single-layer bag. The expansion bags 2 in the outer bag 1 are installed in series at a certain distance through the connecting pipe 3, and the outer bag 1 is divided into a plurality of sealed compartments 11, so that when a problem occurs in one compartment 11, the other compartments are not affected and can continue to work.

[0051] A through tube 21 is provided in the expansion bag 2. The through tube 21 passes through the two side walls of the expansion bag 2 and is sealed with the expansion bag 2. A solenoid valve 22 is installed on the top of the through tube 21. When the solenoid valve 22 is working, the valve is in a normally closed state. The initial pressure of the expansion bag 2 is greater than 1.5 times the working pressure of the outer bag 1.

[0052] The filling capsule is provided with a detachable digital display screen and an audible and visual alarm 5, which are electrically connected to the pressure sensor 4. The digital display screen and the audible and visual alarm 5 can be installed on the capsule, or can be integrated with the water pump, connected to the main controller 10 of the control system, or can be installed separately.

[0053] The water inlet and outlet valves include an outer bag water inlet and outlet valve 51 and an expansion bag water inlet and outlet valve 52, which are respectively arranged at the top of the outer bag 1 and the expansion bag 2. The sewage valves include an outer bag sewage valve 53 and an expansion bag sewage valve 54, which are respectively arranged at the bottom of the outer bag 1 and the expansion bag 2. The residual sewage in the outer bag 1 of the filling bag is discharged through the outer bag drainage valve 51, and the residual sewage in the expansion bag 2 is discharged through the expansion bag drainage valve 52. Both valves use electromagnetic valves, and plugs can be used to replace the electromagnetic valves for blocking in special cases.

[0054] This embodiment also provides a multi-cabin ground-wall joint construction method, comprising the following steps:

[0055] S1. Pressure loading of filling bladder: After completing technical briefing and construction preparation, the filling bladder is hoisted into the hole to be constructed in the underground continuous wall joint space and pressure loaded. The water inlet and outlet valves on the bladder top (the outer bladder water inlet and outlet valves 51 and the expansion bladder water inlet and outlet valves 52) are connected to the water pump 6, and the water pump 6 is connected to the external water source (water storage bag 7). The water pump 6 is used to inject water into the outer bladder 1 and the expansion bladder 2 respectively, and the water enters each expansion bladder 2 in turn through the connecting pipe 3. A flow meter 8 is installed on the outlet pipeline of the water pump 6, and the flow meter 8 is connected to the main controller 10 of the external control system for controlling the capacity and pressure of the filling bladder;

[0056] S2, filling bag pressure monitoring: the pressure sensor 4, the digital display screen and the sound and light alarm 5 are connected to the main controller 10 and the remote monitoring terminal 13 respectively, the pressure sensor 4 collects the pressure of the outer bag 1 and the expansion bag 2 in real time and transmits it to the main controller 10 and / or the remote monitoring terminal 13, and displays and records the filling bag pressure state parameters. When the filling bag pressure reaches a preset value, the main controller 10 and / or the remote monitoring terminal 13 controls the digital display screen and the sound and light alarm 5 to sound and light alarm;

[0057] S3, unloading of filling bag pressure: 4-8 hours after the completion of concrete pouring for underground continuous wall and after the initial setting of concrete is confirmed by probe detection, the expansion bag 2 is first depressurized. After 5-10 minutes of discharge from the expansion bag 2, the outer bag 1 is discharged. The water in the filling bag is naturally discharged under the pressure difference between the inside and the outside, and the space outside the bag is replenished with mud at the same time. When draining, the flow meter 8 is used to detect the water output. The bag is hoisted out of the hole, and the remaining sewage is discharged through the sewage valve (outer bag sewage valve 53 and expansion bag sewage valve 54). When the remaining water is within 0.5 tons, the bag can be lifted by a crane while slowly washing the surface of the bag with water for packaging.

[0058] The technical disclosure in step S1 includes:

[0059] (1) Key control objectives

[0060] 1) Use a borehole detector to detect the depth and width of the underground continuous wall joint groove, and use ultrasonic detection to detect verticality and hole collapse;

[0061] 2) Monitor the water inlet and outlet capacity of the filling bag to prevent underfilling and overfilling;

[0062] 3) The pre-pressure of the expansion bag is 3 kg;

[0063] The pre-pressure value of the outer bag of the filling bag is 2 kg;

[0064] The preload pressure of the outer bag is 2-3 kg. It is strictly forbidden to pour concrete before the preload pressure value is reached.

[0065] The outer bag warning pressure value is 3-4 kg. When the warning pressure value is reached, the discharge speed is slowed down;

[0066] The outer bag alarm pressure value is > 4 kg. When the alarm pressure value is reached, the concrete pouring is stopped immediately. When the pressure value drops to about 3 kg, the concrete pouring is started or the concrete pouring is intermittent.

[0067] (2) The concrete pouring speed is controlled at 10 to 20 m / h;

[0068] (3) 4-8 hours after the concrete pouring is completed, the pressure can be released only after the concrete has initially set using a probe.

[0069] The construction preparation work in step S1 specifically includes:

[0070] (1) Equipment and materials list: underground continuous wall joint filling bag, complete set of loading monitoring equipment, spare tools, and backup filling materials;

[0071] (2) Equipment status check:

[0072] 1) When in continuous use, only the appearance of the filling bag needs to be inspected; when not in use for a long time, safety inspection shall be carried out first, including internal and external pressure inspection. The internal pressure inspection shall be carried out first. If the internal pressure is loaded to 2 kg static pressure for 2 hours and the pressure is ≥1.8 kg (pressure drop ≤10%), it is qualified; the external pressure inspection shall be carried out by locally applying external pressure until the pressure is 4 kg static pressure for 2 hours and the pressure is ≥3.6 kg (pressure drop ≤10%), it is qualified;

[0073] 2) The complete set of loading monitoring equipment 12 and safety control kit are powered on for operation test;

[0074] 3) The quick-connect water pipe assembly 14 and its matching fittings shall be subjected to pressure holding test, quantity and appearance inspection;

[0075] 4) Check the location and safety of water and electricity connections to ensure that the water supply capacity is 20-40 cubic meters per hour and the power supply capacity is more than 10 kilowatts;

[0076] 5) Make a reserve of alternative filling materials to ensure that there are backup materials when the filling bag cannot be used.

[0077] (3) Hole detection:

[0078] 1) Use ultrasonic hole detection to scan the joint space for hole collapse and verticality to understand the actual situation in the hole;

[0079] 2) Use a borer to detect and ensure that there are no sharp objects that damage the capsule and that the capsule is lowered smoothly, and that the perimeter of the rectangular space is ≤ the perimeter of the filling capsule by 5-50 cm;

[0080] 3) Use a plumb bob to perform depth detection and ensure that sandbags 9 with a height of 0.5-5 meters are thrown at the bottom of the joint;

[0081] 4) Use a mud density meter to detect the specific gravity and ensure that the mud density is around 1.2 of the design specification;

[0082] (4) Filling bladder installation

[0083] 1) The bottom of the bag is filled with sandbags 9 with a height of 0.5-5 meters.

[0084] 2) Hang the filling bag into the hole to be constructed in the underground continuous wall;

[0085] 3) Ensure that the height between the top of the bag and the ground is within +0.5m and -1m, and that the liquid level is above the top of the bag. The part that exceeds the top must be lifted with a special frame to ensure that the bag is in a natural vertical state.

[0086] (5) Pipeline connection

[0087] (1) Connect the pipes between the water source (water storage bag), the complete set of loading monitoring equipment 12, and the filling bag;

[0088] (2) Experimental pressurization to check the pipeline's patency and tightness.

[0089] (6) Monitoring Connections

[0090] 1) Check whether the power supply of the pressure acquisition and transmission system is normal;

[0091] 2) Experimental pressurization to check the pipeline's patency and tightness.

[0092] (7) Water filling capacity and pressure setting of the bladder

[0093] The calculation and testing basis of the intracystic volume is as follows:

[0094] 1) Calculate the volume according to the outer dimensions of the capsule and use it as a basis for loading to prevent under- and over-loading;

[0095] 2) The inlet and outlet flow meters are installed on the quick-connect water pipe group 14 of the capsule, and the flow meters are used to count the inlet and outlet flow and detect the status.

[0096] Filling bladder safety pressure basis = bladder internal and external pressure difference + working pressure + concrete pouring side pressure + safety reserve pressure

[0097] 1) Pressure difference between inside and outside the bladder: Since the mud density outside the bladder is about 1.2 and the water density inside the bladder is 1, the pressure difference between inside and outside the bladder will increase with the increase of depth;

[0098] 2) Working pressure: In order to maintain a certain rigidity of the bladder, a certain pressure must be applied. A large number of experiments have shown that 1-1.5 kg of pressure is most suitable.

[0099] 3) Concrete pouring lateral pressure: the lateral pressure generated and the force generated by the insertion and extraction of the concrete pouring conduit;

[0100] 4) Safety reserve pressure: reserve 1 times the safety factor;

[0101] 5) The pressure sensor 4 is installed on the top of the filling bladder to detect the pressure inside the bladder in real time.

[0102] The procedure of adding water to the filling capsule in step S1 includes:

[0103] (1) First, pressurize the expansion bag 2 to 3 kg;

[0104] (2) Pressurize the outer bag 1 to 2 kg;

[0105] (3) After the outer bag 1 is pressurized to 2 kg and subjected to static load for 15 minutes, concrete can be poured.

[0106] The remote monitoring terminal 13 in step S2 includes software on a mobile phone, tablet computer, or computer. The pressure and flow signals monitored and collected by the on-site pressure sensor 4 are converted and transmitted to the remote monitoring terminal 13 through RTU. The remote monitoring terminal 13 monitors and records. The monitoring value settings are consistent with those on site. When the early warning and alarm values ​​are reached, personnel with relevant operating and management authority are notified by phone, text message, WeChat, etc. The data cannot be tampered with and is permanently retained.

[0107] The sound and light alarm in step S2 specifically includes:

[0108] The on-site digital display screen and the remote monitoring terminal 13 synchronously display the real-time pressure values ​​of the outer bag 1 and the expansion bag 2, and the sound and light alarm 5 is activated according to the set pressure value;

[0109] The pre-pressure value of the expansion bag 2 is 3 kg;

[0110] The pre-pressure value of the outer bag 1 of the filling bag is 2 kg;

[0111] When the outer bag pressure value of the filling bag is 2-3 kg, the indicator light turns green and pouring can be done normally;

[0112] When the outer bag pressure value of the filling bag reaches between 3-4 kg, the indicator light turns yellow and an alarm sounds to remind you to slow down the concrete pouring speed;

[0113] When the outer bag pressure value of the filling bag is >4 kg, the indicator light turns red and the alarm sounds, warning you to stop pouring concrete immediately. When the pressure value drops to 3 kg, start pouring concrete or pour concrete intermittently.

[0114] The multi-cabin ground-connected wall joint construction filling bag and the multi-cabin ground-connected wall joint construction method of this embodiment are used for the construction filling of underground continuous wall construction joint space, and are widely used to replace traditional processes such as throwing sandbags, locking pipes, and joint boxes, and have the advantages of simple and fast construction, low cost, and recyclable use;

[0115] The filling bag is divided into multiple independent and sealed compartments. Even if a compartment is damaged, only the single compartment will be depressurized. Since both ends of the pressure relief section are firmly clamped by the expansion bag, most of the concrete can be prevented from bypassing and will not affect the filling effect of other compartments, thereby improving the safety and reliability of the filling bag. The expansion bag is small in size and has strong pressure-bearing capacity. After being divided into sections, the pressure borne by the original entire bag is changed into pressure borne in sections, which is similar to the working principle of rails and sleepers, and is consistent with the casting side pressure and impact force curve during the concrete pouring process, reducing the overall material requirements and further improving reliability.

[0116] Embodiment 2:

[0117] The method is basically the same as the first embodiment, except that:

[0118] like Figures 3 to 7 As shown, the outer bag 1 includes an inner liner 101 and a skeleton layer 102. The skeleton layer 102 is sleeved outside the inner liner 101, and both ends are connected to the inner liner 101 through a flange group. A reinforcing layer 103 and a shaped steel sand bag 104 are installed on the top and bottom between the inner liner 101 and the skeleton layer 102, respectively, and a wear-resistant coating 105 is coated on the outside of the skeleton layer 102.

[0119] The shaped steel sand bag 104 is located between the inner liner 101 and the skeleton layer 102, and is evenly installed in a ring along the inner wall of the skeleton layer 102. The shaped steel sand bag 104 is composed of two pieces of high-strength cloth quilted into a continuous columnar pocket with a diameter of 2-6 cm. Iron sand is placed in the pocket, and the pocket is 1.5-3 meters long. Since the bag is relatively soft and the buoyancy of the bottom of the trough is large, the shaped steel sand bag 104 is used to keep the bottom of the bag in a certain shape, rigidity and weight when it is lowered, which is conducive to the smooth lowering of the bag. After reaching the bottom, the bottom weight and buoyancy keep the bag in a natural vertical state in the trough.

[0120] The inner liner 101 is provided with a hanging screw 108 , which passes through the reinforcement layer 103 and the skeleton layer 102 and extends to the outside of the filling bag. A gasket 109 is provided on the hanging screw 108 .

[0121] The inner liner 101 is made of PVC coated cloth or TPU coated cloth; the skeleton layer 102 is made of a braided tube (such as Figure 3 as shown) or by weaving a crisscross pattern of braided tapes into a ring tube (as shown Figure 6 , Figure 7 As shown, the skeleton layer 102 is processed into an annular outer layer by a radial braided belt 1022 and then spirally wrapped with a weft braided belt 1021. The weft braided belt 1021 can also be installed in one layer inside and outside the radial braided belt 1022); the wear-resistant coating 105 is made of polyurea.

[0122] The flange group includes an inlet and outlet water flange group 106 arranged at the top of the outer bag 1 and a drain flange group 107 at the bottom. The inlet and outlet water flange group 106 is installed with an outer bag inlet and outlet water valve 51 and an expansion bag inlet and outlet water valve 52, and the drain flange group 107 is installed with an outer bag drain valve 53 and an expansion bag drain valve 54. The power cord of the valve is pre-installed on the inner wall of the skeleton layer 102, and is led out from the top of the filling bag and connected to the control power supply using an aviation plug (if a problem with the power supply is found during the safety inspection before construction, the solenoid valve can be removed and sealed with a plug).

[0123] The water inlet and outlet flange group 106 and the sewage flange group 107 are both composed of four flanges (111, 112, 113, 114), the diameter of the water inlet and outlet flange group 106 is between 300-500 mm, and the diameter of the sewage flange group 107 is between 150-200 mm. The end of the inner liner 101 and the end of the skeleton layer 102 are coaxially stacked and installed, and are connected and fixed by the water inlet and outlet flange group 106 and bolts (115, 116, 117). The flanges 111 and 112 clamp the inner liner 101, and the bolts (115, 117) fix the inner liner 101. The flanges (112, 113, 114) clamp the end of the skeleton layer 102 and the end of the reinforcement layer 103, and the bolts (116, 117) fix the skeleton layer 102 and the reinforcement layer 103.

[0124] The filling bladder of this embodiment has a multi-layer outer bladder structure with distinct functions. In particular, the skeleton layer uses an existing extra-large diameter braided tube. The overall braiding has both strength and density and can effectively prevent puncture. Its own rated pressure can reach 4 kg and its bursting pressure can reach 9 kg, providing the bladder with a safety factor of more than twice. At the same time, the replaceable liner can ensure the safe use of the product and effectively reduce costs.

[0125] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for filling bags for multi-cabin ground-connected wall joints, characterized in that: The filling bag includes an outer bag and an expansion bag arranged in the outer bag, and the plurality of expansion bags divide the inner part of the outer bag into a plurality of sealed compartments. The top of the filling bag is provided with an inlet and outlet valve at the water inlet, a pressure sensor is also provided at the top, and a drain valve is provided at the water outlet at the bottom; The construction method includes the following steps: S1. Pressure loading of filling bladder: After completing technical briefing and construction preparation, the filling bladder is hoisted into the hole to be constructed in the underground continuous wall joint space and pressure loaded. The water inlet and outlet valves on the bladder top are connected to a water pump, which is connected to an external water source. The water pump is used to inject water into the outer bladder and the expansion bladder respectively. A flow meter is installed on the outlet pipeline of the water pump, which is connected to the main controller of the external control system to control the capacity and pressure of the filling bladder. S2, filling bag pressure monitoring: the pressure sensor, digital display screen and sound and light alarm are connected to the main controller and the remote monitoring terminal respectively. The pressure sensor collects the pressure of the outer bag and the expansion bag in real time and transmits it to the main controller and / or the remote monitoring terminal, and displays and records the filling bag pressure state parameters. When the filling bag pressure reaches the preset value, the main controller and / or the remote monitoring terminal controls the digital display screen and the sound and light alarm to sound and light alarm; S3. Unloading of filling bag pressure: 4-8 hours after the completion of underground continuous wall concrete pouring and after the initial setting of concrete is confirmed by probe detection, the expansion bag is first depressurized. The expansion bag is discharged for 5-10 minutes and then the outer bag is discharged. The water in the filling bag is naturally discharged under the pressure difference between the inside and the outside, and the space outside the bag is replenished with mud at the same time. When draining water, a flow meter is used to detect the water output. When the bag is hoisted out of the hole, the remaining sewage is discharged through the drain valve.

2. A construction method for filling bags for multi-compartment ground-connected wall joints according to claim 1, characterized in that: The plurality of expansion bags are connected in series via a connecting tube and are fixedly installed inside the outer bag.

3. The construction method of a filling bag for construction of a multi-compartment ground-connected wall joint according to claim 1, characterized in that: A through-tube is arranged in the expansion bladder, which penetrates through the two side walls of the expansion bladder and is sealed with the expansion bladder. A solenoid valve is installed on the top of the through-tube. The initial pressure of the expansion bladder is 1.5 times greater than the working pressure of the outer bladder.

4. The construction method of a filling bag for construction of a multi-compartment ground-connected wall joint according to claim 1, characterized in that: A detachable digital display screen and an audible and visual alarm are installed on the filling bag, and the digital display screen and the audible and visual alarm are electrically connected to the pressure sensor.

5. The construction method of a filling bag for construction of a multi-compartment ground-connected wall joint according to claim 1, characterized in that: The water inlet and outlet valves include an outer bag water inlet and outlet valve and an expansion bag water inlet and outlet valve, which are respectively arranged at the top of the outer bag and the expansion bag. The sewage valve includes an outer bag sewage valve and an expansion bag sewage valve, which are respectively arranged at the bottom of the outer bag and the expansion bag.

6. A construction method for filling bags for multi-compartment ground-connected wall joints according to claim 5, characterized in that: The outer bag includes an inner liner and a skeleton layer. The skeleton layer is sleeved outside the inner liner and connected to the inner liner at both ends through flange groups. A reinforcement layer and a shaped steel sand bag are installed on the top and bottom between the inner liner and the skeleton layer respectively, and a wear-resistant coating is coated on the outside of the skeleton layer.

7. A construction method for filling bags for multi-compartment ground-connected wall joints according to claim 6, characterized in that: The inner liner is provided with hanging screws, which pass through the reinforcement layer and the skeleton layer and extend to the outside of the filling bag.

8. The construction method of a filling bag for construction of a multi-compartment ground-connected wall joint according to claim 6, characterized in that: The inner liner is made of PVC coated cloth or TPU coated cloth; the skeleton layer is made of a braided tube or a braided belt crisscrossed to form a ring tube; and the wear-resistant coating is made of polyurea.

9. The method for constructing a filling bag for a multi-compartment ground-connected wall joint according to claim 6, characterized in that: The flange group includes an inlet and outlet water flange group arranged on the top of the outer bag and a sewage discharge flange group at the bottom. The inlet and outlet water flange group is installed with an outer bag inlet and outlet water valve and an expansion bag inlet and outlet water valve, and the sewage discharge flange group is installed with an outer bag sewage discharge valve and an expansion bag sewage discharge valve.

10. The construction method of a filling bag for construction of a multi-compartment ground-connected wall joint according to claim 1, characterized in that: The sound and light alarm described in step S2 specifically includes: The on-site digital display screen and remote monitoring terminal synchronously display the real-time pressure values ​​of the outer bag and the expansion bag, and the sound and light alarm is activated according to the set pressure value; The pre-pressure value of the expansion bag is 3 kg; The pre-pressure value of the outer bag of the filling bag is 2 kg; When the outer bag pressure value of the filling bag is 2-3 kg, the indicator light turns green and pouring can be done normally; When the outer bag pressure value of the filling bag reaches between 3-4 kg, the indicator light turns yellow and an alarm sounds to remind you to slow down the concrete pouring speed; When the outer bag pressure value of the filling bag is >4 kg, the indicator light turns red and the alarm sounds, warning you to stop pouring concrete immediately. When the pressure value drops to 3 kg, start pouring concrete or pour concrete intermittently.

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