Relay transport method and conveyance device for earthworks in pipe in earth pressure balance pipe jacking

Abstract

The present invention relates to the technical field of pipe construction, and in particular to a relay transport method and conveyance device for earthworks in a pipe in earth pressure balance pipe jacking. The working principle of the relay transport method for earthworks in a pipe in earth pressure balance pipe jacking of the present invention is that the distance of a single jacking is reasonably divided into a plurality of relay sections, and each relay section is equipped with an earth conveying trolley, so as to achieve relay conveyance of the earthworks in the pipe. The conveyance device for earthworks of the present invention comprises earth conveying trolleys and a relay station hopper exchange system, and the trolleys of adjacent relay sections achieve exchange of a fully-loaded hopper and an empty hopper in a pipe by means of the relay station hopper exchange system, achieving the transfer of the earthworks between the trolleys. Compared with a conventional method in earth pressure balance pipe jacking for conveying earthworks by using a single trolley, the method of the present invention has the advantages that the machine head stalling waiting time caused by earthwork conveyance can be greatly shortened, and especially for long-distance pipe jacking construction, the construction efficiency can be greatly improved.

Description

A relay-type earthwork transport method and transport device for earth pressure balance pipe jacking Technical Field

[0001] The invention belongs to the technical field of pipeline construction, and in particular relates to a relay-type earthwork transporting method and a transporting device for an earth pressure balance jacking pipe. Background Art

[0002] Pipe jacking, a trenchless construction technique developed after shield tunneling, is widely used in underground construction, offering advantages such as rapid excavation and high safety. Pipe jacking machines primarily include earth pressure balance, slurry balance, and air pressure balance types. Different types of pipe jacking machines are suitable for different strata and require varying degrees of control over construction parameters. In practical applications, the appropriate pipe jacking machine should be selected based on the specific engineering geological conditions.

[0003] The working principle of earth pressure balance pipe jacking is to balance the groundwater pressure and soil pressure of the stratum at the excavation face with the pressure of the soil chamber in the tool tube. By controlling the amount of excavation or the jacking speed of the pipe jacking machine, the soil pressure value in the sealed soil chamber is controlled to ensure that this soil pressure value is balanced with the sum of the static soil pressure and groundwater pressure in front of the tunnel face, so as to ensure the stability of the tunnel face and prevent excessive settlement or uplift of the surface.

[0004] Currently, the most common method for excavating earth during earth pressure balance (EPB) pipe jacking construction involves a screw conveyor coupled with a trolley that travels on simple tracks. Due to the confined space within the pipe during jacking, the size of the trolley is generally limited, limiting the amount of earth that can be transported at a time. Furthermore, it is difficult to arrange multiple tracks to allow multiple trolleys to circulate within the pipe. In actual engineering applications, when the trolley is fully loaded with earth, it must be transported out of the pipe and then returned to the machine head for reloading. During this period, the pipe jacking machine is unable to advance or excavate due to the need to wait for the trolley to return. For example, in patents CN 116101795 A and CN 111365016 A, only one trolley is transporting earth at a time on the same track, which does not fundamentally address the problem. As the jacking distance increases, the time required for the trolley to transport earth increases, and so does the waiting time for the pipe jacking machine. This significantly impacts the efficiency of pipe jacking projects with long single jacking distances.

[0005] The patent "Earth Pressure Balance Pipe Jacking Machine Construction and Excavation System" (publication number CN212898506U) discloses an earth pressure balance pipe jacking machine construction and excavation system, including an earth pressure balance pipe jacking machine, a mixing tank, a mud-water separator and a PLC. A screw conveyor is provided at the bottom of the cavity inside the earth pressure balance pipe jacking machine, and the output port of the screw conveyor is located above the mixing tank. The mixing tank is a hollow rectangular parallelepiped with an open upper side. The mixing tank is arranged adjacent to the external tail end of the pipe jacking machine, and is provided with a stirring paddle and a mud pump inside. The mud pump is connected to the mud-water separator through a first plastic hose; the PLC is welded and fixed to the power supply of the earth pressure balance pipe jacking machine, and the liquid level information in the mixing tank is monitored in real time through a liquid level sensor and fed back to the PLC. The PLC controls the switching of the screw conveyor, the driving motor of the stirring paddle, the mud pump and the mud-water separator according to the information to realize the automatic excavation operation of the earth pressure balance pipe jacking machine. The application of this utility model patent must be applied when the excavated earth is in a mud state or after the earth is improved into a mud state, which has great limitations. In addition, the mud needs to be subsequently processed after the earth is transported, which increases the cost. For construction in cities, there may also be insufficient construction space, and a mud sedimentation tank cannot be arranged at the jacking working shaft, which further limits the application of the system. Technical issues

[0006] The purpose of the present invention is to solve the problem that the existing earthwork transportation method causes the machine head to wait for the earth-moving trolley for a long time, resulting in low construction and transportation efficiency, and to provide an earth pressure balance type jacking pipe earthwork relay type reverse transportation method and transportation device to improve construction efficiency. Technical Solutions

[0007] The technical solution adopted by the present invention to solve the above problems is:

[0008] An earth pressure balance type pipe jacking in-pipe earthwork transportation device includes a screw conveyor, an earth-moving trolley, and a temporary track. The screw conveyor is installed behind the pipe jacking cutterhead. The earth-moving trolley includes a chassis and a hopper that can be separated from the chassis. The earth pressure balance type pipe jacking in-pipe earthwork transportation device also includes a plurality of relay stations. The relay stations are provided with a hopper exchange system. The hopper exchange system includes a lift, and the lift is installed on the lift base platform.

[0009] The relay stations are sequentially set up on both sides of the temporary track between the pipe jacking machine and the pipeline outlet, and a soil transport trolley is equipped between every two adjacent relay stations.

[0010] Preferably, the distance l1 between the first station closest to the head of the pipe jacking machine and the unearthed head of the pipe jacking machine in the relay station is calculated as follows:

[0011]

[0012] Where:

[0013] V d : Daily excavation volume required by the construction schedule (m³);

[0014] V0: Full load volume of soil transport vehicle (m³);

[0015] l s : acceleration distance of soil transport vehicle (m);

[0016] l f : deceleration distance of soil transport vehicle (m);

[0017] l1: distance between stations 0 and 1 (m), station 0 refers to the position where the head of the pipe jacking machine is unearthed, and station 1 refers to the relay station closest to the head of the pipe jacking machine;

[0018] v s : Average speed of the soil transport vehicle during acceleration (m / min);

[0019] v: the average speed of the soil-carrying trolley in the pipe (m / min);

[0020] v f : Average speed of the soil transport vehicle during deceleration (m / min);

[0021] t0: Single vehicle earthwork loading time (min);

[0022] t1: The total time (min) for the soil transport vehicle to complete one soil loading and unloading operation between stations 0 and 1;

[0023] t c1 : The time (min) it takes to replace a full hopper with an empty hopper after the soil transport vehicle arrives at the relay station.

[0024] Preferably, in the relay station, the distance between the second and subsequent relay stations is calculated as follows:

[0025]

[0026] Where:

[0027] l i : The distance between the (i-1)th to i-th stations (m), the i-th station refers to the i-th relay station counted from the head position of the pipe jacking machine toward the starting well, i>1;

[0028] t i : The total time (min) for the soil transport vehicle to complete one soil transport between the (i-1)th to i-th stations;

[0029] t c2: The time (min) it takes for the soil-carrying trolley at the previous station to replace the empty hopper with a full hopper after arriving at the relay station.

[0030] Preferably,

[0031] The hopper can be lifted up using the lift at the relay station; when the hopper is lifted up to the maximum height, a soil-carrying trolley with the hopper can pass normally underneath.

[0032] Preferably, the bottom plate of the soil transport trolley adopts a groove design, and the shape of the bottom of the hopper matches the groove.

[0033] In addition, the present invention also discloses a relay-type earthwork transport method in an earth pressure balance type jacking pipe, comprising:

[0034] Step S1. Design of relay station spacing;

[0035] The design of the relay station spacing needs to consider a comprehensive number of factors, including the total duration of a single jacking operation, the pipeline jacking speed, the jacking and excavation speed, the full load volume of the soil transport trolley, the average speed of the soil transport trolley in the pipeline, and the time it takes for the trolleys to exchange hoppers at the relay station.

[0036] The distance between stations 0 and 1 can be calculated as follows:

[0037]

[0038] in:

[0039] V d : Daily excavation volume required by the construction schedule (m³);

[0040] V0: The full load volume of the trolley (m³);

[0041] l s : acceleration distance of the car (m);

[0042] l f : distance of the car deceleration section (m);

[0043] l1: distance between stations 0 and 1 (m), station 0 refers to the position where the head of the pipe jacking machine is unearthed, and station 1 refers to the relay station closest to the head of the pipe jacking machine;

[0044] v s : Average speed of the soil transport vehicle during acceleration (m / min);

[0045] v: the average speed of the soil-carrying trolley in the pipe (m / min);

[0046] v f : Average speed of the soil transport vehicle during deceleration (m / min);

[0047] t0: Single vehicle earthwork loading time (min);

[0048] t1: The total time (min) for the trolley to complete one earthwork loading and unloading operation between stations 0 and 1;

[0049] t c1 : The time it takes to replace a full hopper with an empty hopper after the trolley arrives at the relay station (min);

[0050] The distance between the (i-1)th and i-th stations can be calculated as follows:

[0051]

[0052] in:

[0053] l i : The distance between the (i-1)th to i-th stations (m), the i-th station refers to the i-th relay station counted from the head position of the pipe jacking machine toward the starting well, i>1;

[0054] t i : The total time for the trolley to complete one earthwork transfer between the (i-1)th to i-th stations (min);

[0055] t c2 : The time (min) it takes for the trolley at the current station to replace the empty hopper with a full hopper after the trolley at the previous station arrives at the relay station;

[0056] Step S2. Prefabrication of relay station pipe segments;

[0057] The relay station pipe section is composed of more than one section of pipe. During the prefabrication of the relay pipe section, embedded parts for fixing the lift support platform should be embedded in advance.

[0058] Step S3. Jacking the relay station pipe section;

[0059] The relay station pipe segments should be jacked in accordance with the designed relay station spacing; from the moment the first relay station pipe segment is jacked in and put into use, the earthwork inside the pipe can be transported in a relay manner;

[0060] Step S4. Installing the lift support platform;

[0061] After the relay station pipe section is jacked in, the pre-buried embedded parts are used to fix the lift support platform to make it stable and firm.

[0062] Step S5. Install the lift;

[0063] After the lift support platform is installed, two lifts are installed on the lift support platform according to the size of the soil transport trolley. After the soil transport trolley enters the station, the two lifts are located in the middle of the front and rear soil transport trolleys respectively.

[0064] Step S6. Relay transport in the earthwork pipe

[0065] At the relay station, the positions of the full hopper and the empty hopper are replaced, and the soil-carrying trolley moves back and forth to transport the full hopper out of the pipe.

[0066] Preferably, step S6 further comprises:

[0067] Designate trolley a as a fully loaded soil-carrying trolley, and trolley b as an empty soil-carrying trolley. Trolley b is located at the relay station on the side of the pipe jacking machine in the area;

[0068] After trolley a transports the soil to the relay station, the hopper replacement is started to exchange the hoppers of trolley a and trolley b.

[0069] Preferably, after trolley a transports the soil to the relay station, it first confirms whether there is a trolley b waiting at the relay station. If there is no trolley b at the relay station, it is necessary to wait for trolley b to return to the relay station before replacing the hopper; if there is a trolley b waiting at the relay station, the hopper replacement is started directly.

[0070] Preferably, the hopper replacement method further comprises:

[0071] Step S601. The lift at the relay station simultaneously lifts the hoppers of cart a and cart b. The hopper of cart a is lifted to a height sufficient to separate it from the chassis of cart a, and the hopper of cart b is lifted to a height sufficient to allow the carts to pass under the hopper of cart b.

[0072] Step S602: The chassis of trolley a and trolley b move synchronously toward the head of the pipe jacking machine until the chassis of trolley b is directly below the hopper of trolley a.

[0073] Step S603. The lift that lifts the hopper of trolley a slowly descends, and the hopper of trolley a falls onto the chassis of trolley b;

[0074] Step S604: The chassis of trolley a and trolley b simultaneously move toward the starting shaft of the pipe jacking machine until the chassis of trolley a is directly below the hopper of trolley b.

[0075] Step S605. The lift that lifted the hopper of trolley b slowly descends, placing the hopper of trolley b on the chassis of trolley a, thus completing the hopper replacement of trolley a and trolley b.

[0076] Step S606: Trolley a moves toward the head of the pipe jacking machine, and trolley b continues to transport earth toward the starting well to the next relay station;

[0077] Step S607: At the subsequent relay station, steps S601 to S606 are repeated until the earthwork is transported out of the pipeline. Beneficial effects

[0078] The beneficial effects of the present invention are:

[0079] (1) When the distance between pipes is long, multiple earth-moving trolleys can be used to transport earth on the same track. Compared with the traditional method in which only one trolley can transport earth on the same track in one cycle, the earth-moving efficiency is greatly improved.

[0080] (2) The time the pipe jacking machine waits for the soil transport vehicle is controlled within the transportation time of a fixed distance (i.e., the soil transport time from station 0 to station 1). This solves the problem of the traditional method where the waiting time for the soil transport vehicle increases with the increase of the pipe jacking distance. For long-distance pipe jacking, this can significantly improve the pipe jacking efficiency and save time and costs.

[0081] In a pipe jacking project, the jacking distance is 600m. Based on the total duration of a single jacking, the pipe jacking speed, the jacking and excavation speed, the earthwork volume of the full-load earthmoving trolley, the average speed of the earthmoving trolley in the pipe, and the time it takes for the trolleys to exchange hoppers at the relay stations, the distance between the relay stations is determined to be 100m. The improvement in pipe jacking efficiency achieved by the present invention can be estimated as follows:

[0082] For the first 100m of pipe jacking, the traditional method and the method of the present invention have the same efficiency;

[0083] For the pipe jacking in the range of 100m-600m, the traditional method gradually increases the trolley transportation distance from 100m to 600m each time the earth is unearthed. The average transportation distance can be estimated as 350m. If a total of n vehicles are required for earth transportation and the average speed of the trolley is v, the total waiting time of the head is 350×2n / v. If earth transportation is carried out according to the method of the present invention, the transportation distance of each trolley is set to 100m; after the first trolley completes the earth transportation relay and returns to the head position, the pipe jacking can continue to work, and the subsequent earth transportation process has nothing to do with the work of the pipe jacking machine head. The total waiting time of the head is 100×2n / v. Compared with the traditional method, the waiting time can be saved by more than 70%.

[0084] (3) The method of the present invention can be easily programmed into a process flow and can be fully automated through system development.

[0085] (4) The space inside the jacking pipe is small, making the single-track plus branch and double-track scheduling methods used in tunnel excavation and mucking out unsuitable. The equipment and tools used in the present invention are simple in structure, and the trolley does not need to be equipped with a folding system similar to the stacking frame in existing designs. It is low in cost and easy to process and install, which is conducive to on-site application.

[0086] (5) By applying the solution of the present invention, the earthwork transported by the locomotive trolley can be controlled within a fixed transport distance, so that the time the locomotive waits for the trolley is not affected by the distance of the jacking pipe. In terms of earthwork transport efficiency, when the distance of the jacking pipe is far, multiple trolleys can be linked and transported synchronously on the same track, which effectively solves the problem of increased transportation time and reduced construction efficiency caused by only one trolley transporting earthwork at a time on the same track as the distance of the jacking pipe increases.

[0087] (6) The size design of the trolley and the relay station in the present invention can be designed according to the diameter of the jacking pipe. It is recommended to apply the method of the present invention in the construction of jacking pipes with an inner diameter of 3m or more. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Figure 1 is a schematic diagram of the assembly of the chassis and hopper of the soil transport vehicle of the present invention;

[0089] FIG2 is a schematic structural diagram of the soil transport vehicle of the present invention after assembly;

[0090] FIG3 is a schematic diagram of the hopper jacking of the soil transport trolley of the present invention;

[0091] FIG4 is a schematic structural diagram of a relay station according to the present invention.

[0092] Reference numerals: 1 - hopper, 2 - chassis, 3 - lift, 4 - lift base platform, 5 - pipe, 6 - temporary track. Best Mode for Carrying Out the Invention

[0093] This embodiment discloses a relay-type earthwork transporting method in an earth pressure balance type jacking pipe.

[0094] Step 1: Design of relay station spacing and soil transport vehicles

[0095] The relay station spacing is designed using the method of Example 2.

[0096] Step 2: Prefabrication of relay station pipe segments

[0097] The relay station pipe segment can be composed of a single segment or multiple segments, depending on the size of the earth-moving trolley. During the prefabrication of the relay pipe segment, in addition to meeting all the requirements for ordinary pipe segment prefabrication, embedded parts for fixing the lift support platform should also be pre-buried.

[0098] Step 3: Jacking the relay station pipe section

[0099] Relay station pipe segments should be jacked in accordance with the designed relay station spacing. Relay station segments composed of multiple segments should be jacked in the correct order. Pipe jacking is performed in the same manner as conventional pipe segments. From the moment the first relay station segment is jacked and commissioned, the earthwork within the pipe can be transported using a relay method.

[0100] Step 4: Install the lift support platform

[0101] The lift support platform should be a prefabricated structure that is easy to install and dismantle, such as a steel structure platform. After the relay station pipe section is jacked in, the lift support platform is fixed with pre-buried embedded parts to ensure that the lift support platform is stable and firm.

[0102] Step 5: Install the Lift

[0103] After the installation of the lift support platform is completed, two lifts are installed on the lift support platform according to the specific size of the soil-carrying trolley. After the soil-carrying trolley enters the station, the two lifts are located in the middle of the front and rear trolleys respectively.

[0104] Step 6: Relay transportation inside the earthwork pipe

[0105] From the moment the first relay station pipe section is installed and put into use, the earthwork in the pipe can be transported in a relay manner. To achieve relay transportation of earthwork, a soil transport trolley must be deployed between two adjacent stations until the starting well. The key to the relay earthwork transport method is to complete the position exchange of the full and empty hoppers at the relay stations. The specific method is as follows:

[0106] (1) An empty trolley (hereinafter referred to as trolley b) is located at the relay station with the smallest sequence number in its area (hereinafter referred to as the starting station) and waits for the fully loaded soil-carrying trolley in front of it.

[0107] (2) After a fully loaded trolley (hereinafter referred to as trolley a) transports the soil to the relay station, first confirm whether there is an empty trolley waiting at the relay station. If there is no trolley b at the relay station, it is necessary to wait for trolley b to return to the relay station before replacing the hopper. If there is trolley b at the relay station, the hopper replacement is started immediately.

[0108] (3) The steps for hopper replacement are:

[0109] ① Use the lift at the relay station to lift the hoppers of trolleys a and b at the same time. To ensure installation, the lifting height of trolley a should meet the separation requirements between the trolley and the chassis, and it does not need to be too high. The lifting height of trolley b should meet the requirements for the normal passage of the trolley with the hopper below;

[0110] ② The chassis of the two trolleys move synchronously toward the head of the pipe jacking machine until the chassis of trolley B is directly below the hopper of trolley A and stops;

[0111] ③ The lift that lifts up the hopper of trolley a slowly descends, and the hopper of trolley a falls onto the chassis of trolley b;

[0112] ④ The chassis of the two trolleys move simultaneously toward the starting well of the pipe jacking machine until the chassis of trolley a is directly below the hopper of trolley b;

[0113] ⑤ The lift that lifts up the hopper of trolley b slowly descends, and the hopper of trolley b falls onto the chassis of trolley a, thus completing the hopper replacement of trolley a and trolley b;

[0114] ⑥ Trolley a moves toward the next relay station (or the head of the pipe jacking machine), and trolley b continues to transport earthwork toward the starting well to the next relay station;

[0115] ⑦ Repeat steps ① to ⑥ until the earthwork is transported out of the pipeline. Modes for Carrying Out the Invention

[0116] The embodiments disclosed in the present invention are described below with reference to the accompanying drawings. Example 1

[0117] The present embodiment discloses an earth pressure balance type pipe jacking earth transportation device, including a screw conveyor, a soil transport trolley and a temporary track. The screw conveyor is installed behind the pipe jacking cutter head, as shown in Figures 1 to 4. The soil transport trolley includes a chassis 2 and a hopper 1 that can be separated from the chassis 2. The earth transportation device also includes a plurality of relay stations. The relay station is provided with a hopper exchange system. The hopper exchange system includes a lift 3. The lift 3 is installed on the lift base platform 4. The relay station is also provided with a control system and a hydraulic pump. The control system includes a variety of sensor devices and automatic control software, which can realize fully automatic control of the relay-type earth transportation.

[0118] The relay stations are sequentially arranged on both sides of the temporary track 6 between the pipe jacking machine and the pipeline outlet. The temporary track is laid in the pipeline 5. A soil transport trolley is provided between every two adjacent relay stations.

[0119] In this embodiment, two sets of lifts are arranged at each relay station.

[0120] Hopper 1 can be lifted using hoist 3 at the relay station. In actual construction, the hoist used to lift the fully loaded hopper can be replaced with two jacks placed on either side of the track. However, the hoist used to lift the empty hopper cannot be replaced with jacks. When the hopper is raised to its maximum height, a soil-carrying cart carrying the hopper can pass underneath normally.

[0121] As shown in FIG1 and FIG2, the chassis 2 of the soil transport vehicle adopts a groove design, and the bottom shape of the hopper 1 matches the groove.

[0122] A horizontal steel plate is provided on the top of the wall panel of the soil transport trolley hopper 1. The width of the steel plate should meet the needs of lifting the hopper by a lift or jack. The horizontal steel plate and the wall panel are reinforced to form a stable structure. Example 2

[0123] This embodiment discloses the layout positions of the relay stations in the first embodiment.

[0124] Among the relay stations set up in sequence, the distance l1 between the first station closest to the pipe jacking machine head and the unearthed position of the pipe jacking machine head is calculated as follows:

[0125]

[0126] Where:

[0127] V d : Daily excavation volume required by the construction schedule (m³);

[0128] V0: Full load volume of soil transport vehicle (m³);

[0129] l s : acceleration distance of soil transport vehicle (m);

[0130] l f : deceleration distance of soil transport vehicle (m);

[0131] l1: distance between stations 0 and 1 (m), station 0 refers to the position where the head of the pipe jacking machine is unearthed, and station 1 refers to the relay station closest to the head of the pipe jacking machine;

[0132] v s : Average speed of the soil transport vehicle during acceleration (m / min);

[0133] v: the average speed of the soil-carrying trolley in the pipe (m / min);

[0134] v f : Average speed of the soil transport vehicle during deceleration (m / min);

[0135] t0: Single vehicle earthwork loading time (min);

[0136] t1: The total time (min) for the soil transport vehicle to complete one soil loading and unloading operation between stations 0 and 1;

[0137] t c1 : The time (min) it takes to replace a full hopper with an empty hopper after the soil transport vehicle arrives at the relay station.

[0138] In the relay station, the distance between the second and subsequent relay stations is calculated as follows:

[0139]

[0140] Where:

[0141] l i: The distance between the (i-1)th ~ i-th station (m), the i-th station refers to the i-th relay station counted from the head position of the pipe jacking machine toward the starting well;

[0142] t i : The total time for the trolley to complete one earthwork transfer between the (i-1)th to i-th stations (min);

[0143] t c2 : The time (min) it takes for the trolley at this station to replace the empty hopper with a full hopper after the trolley at the previous station arrives at the relay station.

[0144] The above parameters can be determined based on the design of the soil-moving trolley and its control system. In actual application, the design of the relay station spacing should be determined based on the following parameters: the total duration of a single jacking operation, the pipeline jacking speed, the jacking and excavation speed, the full load volume of the soil-moving trolley, the average speed of the trolley in the pipeline, and the time it takes for the trolley to exchange hoppers at the relay station. Industrial Applicability

[0145] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or changes based on the technical solutions and inventive concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. An earth pressure balance pipe jacking method for in-pipe earthwork relay reverse transportation, characterized in that, Including: Step S1: Relay station spacing design; The distance between the 0th and 1st stations can be calculated and solved as follows: Where: V d : Single-day earth excavation volume (m³) required by the construction progress plan; V0: The full-load earth-loading capacity of the earth-transporting trolley (m³); l s : Distance of the earth-hauling trolley during the acceleration phase (m); l f : Distance of the earth-hauling trolley in the deceleration section (m); l1: The distance between the 0th and 1st stations (m). The 0th station refers to the earth-excavation position of the pipe jacking machine head, and the 1st station refers to the relay station closest to the position of the pipe jacking machine head; v s : Average speed of the earth-hauling trolley during the acceleration phase (m / min); v: The normal average traveling speed of the earth-transporting trolley in the pipe (m / min); v f : Average speed of the earth-moving trolley during the deceleration period (m / min); t0: The single-car earth-loading time (min); t1: The total time for the earth-transporting trolley to complete one-time earth loading and transfer between the 0th and 1st stations (min); t c1 : The time (min) for the earth-hauling trolley to replace the fully-loaded hopper with an empty hopper after reaching the relay station; The distance between the (i - 1)th and ith stations can be calculated and solved as follows: Where: l s : Distance of the earth-moving trolley during the acceleration stage (m); l f : Distance of the earth-hauling trolley during deceleration (m); v s : Average speed of the earth-moving trolley during the acceleration phase (m / min); v: The normal average traveling speed of the earth-transporting trolley in the pipe (m / min); v f : Average speed of the earth-hauling trolley in the deceleration section (m / min); l i : Distance between the (i - 1)-th and i-th stations (m). The i-th station refers to the i-th relay station counted from the position of the pipe jacking machine head towards the launching shaft, where i > 1; t i : The total time (min) for the earth-moving trolley to complete one earthwork transfer between the (i - 1)-th and i-th stations; t c1 : The time (min) for the earth-hauling trolley to replace the fully-loaded hopper with an empty hopper after reaching the relay station; t c2 : The time (min) for the soil transport trolley at this station to replace the empty hopper with a full hopper after the soil transport trolley from the previous station arrives at the relay station; Step S2: Prefabrication of relay station pipe sections; The relay station pipe section consists of more than one section of pipe; during the prefabrication of the relay pipe section, embedded parts for fixing the lifting machine support platform are pre-buried; Step S3: Jacking the relay station pipe section; The relay station pipe section should be jacked according to the relay station spacing designed in Step S1; Step S4: Install the lifting machine support platform; After the relay station pipe section is jacked, use the pre-buried embedded parts to fix the lifting machine support platform to make the lifting machine support platform stable and firm; Step S5: Install the lifting machine; After the installation of the lifting machine support platform is completed, according to the size of the earth-transporting trolley, install 2 lifting machines on the lifting machine support platform so that when the earth-transporting trolley enters the station, the 2 lifting machines are respectively located in the middle positions of the front and rear earth-transporting trolleys; Step S6: Relay transfer of earth in the pipe; At the relay station, the positions of the full-load hopper and the empty hopper are replaced, and the earth-transporting trolley moves back and forth to transport the full-load hopper out of the pipe.

2. The method for relaying and transporting the soil in the pipe of the earth pressure balance pipe jacking according to claim 1, characterized in that, The said Step S6 further includes: Designate trolley a as the full-load earth-transporting trolley and trolley b as the empty earth-transporting trolley. The trolley b is located at the relay station on the side of the pipe jacking machine in the area where it is located; After the trolley a transports the earth to the relay station, start the hopper replacement to exchange the hoppers of the trolley a and the trolley b.

3. The earth pressure balance pipe jacking method for in-pipe earth transfer by relay according to claim 2, characterized in that After the trolley a transports the earth to the relay station, first confirm whether there is the trolley b waiting at the relay station. If there is no trolley b at the relay station, it is necessary to wait for the trolley b to return to the relay station before performing the hopper replacement; If there is the trolley b waiting at the relay station, directly start the hopper replacement.

4. According to the method for relay transfer of earth in the pipe of the earth pressure balance pipe jacking according to claim 1 or 2, characterized in that The said hopper replacement method further includes: Step S601: The lifting machine at the relay station jacks up the hoppers of trolley a and trolley b simultaneously. The jacking height of the hopper of trolley a meets the requirement of separating the hopper of trolley a from the chassis of trolley a, and the jacking height of the hopper of trolley b should meet the requirement that the trolley can pass normally under the hopper of trolley b; Step S602: The chassis of trolley a and the chassis of trolley b move synchronously towards the direction of the pipe jacking machine head until the chassis of trolley b is directly below the hopper of trolley a and then stop; Step S603: The lifting machine that jacks up the hopper of trolley a slowly descends to place the hopper of trolley a on the chassis of trolley b; Step S604: The chassis of trolley a and the chassis of trolley b move simultaneously towards the direction of the pipe jacking starting shaft until the chassis of trolley a is directly below the hopper of trolley b and then stop; Step S605: The lifter that jacks up the hopper of trolley b slowly descends, and the hopper of trolley b is placed on the chassis of trolley a. Thus, the replacement of the hoppers of trolley a and trolley b is completed. Step S606: Trolley a drives towards the direction of the head of the pipe jacking machine, and trolley b continues to transport the soil to the next relay station in the direction of the launch shaft. Step S607: In subsequent relay stations, the steps S601 to S606 are cycled until the soil is transported out of the pipeline.

5. The transportation device for the method of in-pipe earth relay transportation of the earth pressure balance pipe jacking described in claim 1 or 2, comprising a screw conveyor, an earth transport trolley and a temporary track. The screw conveyor is installed behind the pipe jacking cutter head. The earth transport trolley includes a chassis and a hopper separable from the chassis, and is characterized in that, The soil transportation device for earth pressure balance pipe jacking in the pipe further includes a number of relay stations. The relay stations are provided with a hopper exchange system. The hopper exchange system includes a lifter, and the lifter is installed on the base platform of the lifter. The relay stations are sequentially arranged on both sides of the temporary track between the pipe jacking machine and the pipe outlet. One soil transport trolley is equipped between every two adjacent relay stations.

6. The transport device of the earth pressure balance pipe jacking in-pipe soil relay transfer method according to claim 5, characterized in that, In the relay station, the calculation method of the distance l1 between the nearest No. 1 station to the head position of the pipe jacking machine and the soil excavation at the head of the pipe jacking machine is as follows:

7. In the formula: V d : The single-day earthwork output (m³) required by the construction progress plan; V0: The full-load soil loading capacity of the soil transport trolley (m³); l s : Distance of the earth-hauling trolley during the acceleration phase (m); l f : Distance of the earth-hauling trolley in the deceleration section (m); l1: The distance between the 0-1 stations (m). The 0th station refers to the soil excavation position at the head of the pipe jacking machine, and the 1st station refers to the relay station closest to the head position of the pipe jacking machine; v s : Average speed of the earth-hauling trolley during the acceleration phase (m / min); v: The normal average traveling speed of the soil transport trolley in the pipe (m / min); v f : Average speed of the earth-moving trolley in the deceleration section (m / min); t0: The single-vehicle soil loading time (min); t1: The total time for the soil transport trolley to complete one-time soil loading and transfer between the 0-1 stations (min); t c1 : The time (min) for the earth-moving trolley to replace the fully loaded hopper with an empty hopper after reaching the relay station.

8. The transportation device for the in-pipe earthwork relay reverse transportation method of the earth pressure balance pipe jacking according to claim 6, characterized in that, In the relay station, the calculation method of the distance between the 2nd station and subsequent relay stations is as follows: In the formula: l s : Distance of the earth-hauling trolley during the acceleration phase (m); l f : Distance of the earth-moving trolley in the deceleration section (m); v s : Average speed of the earth-moving trolley during the acceleration phase (m / min); v: The normal average traveling speed of the soil transport trolley in the pipe (m / min); v f : Average speed of the earth-hauling trolley in the deceleration section (m / min); l i : Distance between the (i - 1)-th and i-th stations (m). The i-th station refers to the i-th relay station counted from the position of the pipe jacking machine head towards the launching shaft, where i > 1; t i : The total time (min) for the earth-hauling trolley to complete one earthwork transfer between the (i - 1)-th and i-th stations; t c1 : The time (min) for the earth-hauling trolley to replace the fully-loaded hopper with an empty hopper after reaching the relay station; t c2 : The time (min) for the earth-moving trolley at this station to replace the empty hopper with a full hopper after the earth-moving trolley from the previous station arrives at the relay station.

9. The transport device of the earth pressure balance pipe jacking pipe-internal soil relay transfer method according to any one of claims 5-7, characterized in that The hopper can be jacked up by the lifter of the relay station; when the hopper is jacked up to the maximum height, the soil transport trolley with the hopper can pass normally below.

10. The transport device for the in-pipe earthwork relay reverse transportation method of the earth pressure balance pipe jacking according to any one of claims 5-7, characterized in that, The chassis of the soil transport trolley adopts a groove design, and the bottom shape of the hopper matches the groove.

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