Pumping and delivery pump and tunnel cavity pressure reduction construction method using the pumping and delivery pump

Abstract

The present application relates to the field of tunnel construction methods, and in particular to a pumping and conveying pump and a tunnel cavity pressure reduction construction method using the pumping and conveying pump, comprising at least one section of a shell, a conveying spiral blade and a driving member, a main shaft is provided in the shell, the conveying spiral blade is provided on the outer surface of the main shaft, the conveying spiral blade is located in the shell, the driving member is located at one end of the shell and is connected to the conveying spiral blade, at least one inlet and outlet are provided on the shell, the pumping and conveying pump also includes a sorting member located at the inlet position for sorting the size of objects, the sorting member is provided in the shell, and the sorting member is connected to the end of the conveying spiral blade near the inlet. When the pumping and conveying pump provided in the present application is working, it pumps and conveys objects and discharges them, and the sorting member blocks larger objects from entering the shell to prevent them from clogging the pumping and conveying pump and affecting the discharge of objects, thereby improving work efficiency and extending the service life of the pumping and conveying pump.

Description

Technical Field

[0001] The present application relates to the field of tunnel construction methods, and in particular to a pumping and delivery pump and a tunnel cavity pressure reduction construction method using the pumping and delivery pump. Background Art

[0002] Tunnel construction is sometimes carried out under karst geological conditions. During the construction process, filling cavities are encountered. Since there is a large water and soil pressure inside the filling cavities, if the filling cavities are not treated, it will cause engineering disasters such as water inrush, mud inrush, and sand inrush, which will seriously affect the safety of tunnel construction and shorten the construction period.

[0003] There are generally two ways to deal with filling cavities. First, drilling, which involves drilling holes in the barrier rock between the face and the cavity to discharge the filling in the cavity. However, due to the large objects in the cavity, the hole can easily be clogged. If a discharge device is placed in the hole, the large objects in the cavity will also clog the discharge device, making it impossible to perform normal discharge work and reducing the service life of the discharge device. If too many holes are drilled in the barrier rock, the stability of the tunnel will be reduced, and the external environment (such as rain) will increase the pressure, which can easily cause the tunnel to collapse. Second, blasting, which involves blasting the barrier rock to release the filling in the cavity. However, this method is not suitable for large cavities. If a large cavity is blasted, the filling will gush out and rush to the cave entrance, causing harm to the equipment and personnel in the tunnel.

[0004] With respect to the above-mentioned related technologies, the inventors believe that using drilling or blasting to treat filled cavities is prone to engineering disasters, reduces tunnel safety, and affects the construction period. Summary of the Invention

[0005] In order to solve the problem of easy occurrence of engineering disasters and reduced tunnel safety when treating filled cavities, the present application provides a pumping and delivery pump and a tunnel cavity pressure reduction construction method using the pumping and delivery pump.

[0006] In the first aspect, the present application provides a pumping and delivery pump, which adopts the following technical solution:

[0007] A pumping and conveying pump includes at least one shell, a conveying spiral blade and a driving member. A main shaft is arranged in the shell, and the conveying spiral blade is arranged on the outer surface of the main shaft. The conveying spiral blade is located in the shell. The driving member is located at one end of the shell and is connected to the conveying spiral blade. The shell is provided with at least one inlet and outlet. The pumping and conveying pump also includes a sorting member located at the inlet position for sorting the size of objects. The sorting member is arranged in the shell and is connected to the end of the conveying spiral blade close to the inlet.

[0008] By adopting the above technical solution, when the pumping and conveying pump is working, it pumps, conveys and discharges objects. The sorting component blocks larger objects from entering the shell, preventing them from clogging the pumping and conveying pump and affecting the discharge of objects, thereby improving work efficiency and extending the service life of the pumping and conveying pump.

[0009] Optionally, there are two inlets, which are respectively arranged on two opposite side surfaces of the shell, and the circumferential edges of the inlets are partially recessed so that the inlets are arc-shaped in the length direction of the shell.

[0010] By adopting the above technical solution, the object enters the shell through two entrances, and the entrances are partially recessed, which facilitates the object to enter the shell from different directions, thereby improving work efficiency.

[0011] Optionally, the sorting member is a sorting spiral blade, one end of the main shaft extends away from the driving member, the sorting spiral blade is arranged on the outer surface of the main shaft, and is fixedly connected to the end of the conveying spiral blade near the inlet, and the pitch of the sorting spiral blade is smaller than the pitch of the conveying spiral blade.

[0012] By adopting the above technical solution, the pitch of the sorting spiral blade is smaller than the pitch of the conveying spiral blade, which can prevent objects with a size larger than the pitch of the sorting spiral blade from entering the shell. Objects with a size suitable for the pitch of the sorting spiral blade can be smoothly conveyed after entering the shell because the pitch of the conveying spiral blade is larger than the pitch of the sorting spiral blade, preventing larger objects from entering and clogging the shell, ensuring smooth flow inside the shell, reducing the motor load caused by blockage, and improving work efficiency.

[0013] Optionally, the outer diameter of the sorting spiral blade is larger than the outer diameter of the conveying spiral blade, and two inlets extend from the edge of the sorting spiral blade.

[0014] By adopting the above technical solution, the outer diameter of the sorting spiral blade is larger than the outer diameter of the thread blade, and the sorting spiral blade extends two inlets, which reduces the entrance space of the inlet. The rotating sorting spiral blade draws smaller objects in and transports them into the shell. At the same time, the entrance of the inlet is reduced to prevent larger objects from entering the shell, further sorting smaller objects and larger objects, ensuring the normal operation of the extraction and delivery pump.

[0015] Optionally, the pumping and delivery pump further includes at least one central suspension shaft, one end of which is located on the outer surface of the shell, and the other end of which passes through the outer wall of the shell and is connected to the delivery spiral blade.

[0016] By adopting the above technical solution, the central suspension shaft fixedly connects the shell and the conveying spiral blade. The pumping and conveying pump includes a multi-section shell, and multiple central suspension shafts are arranged in the length direction of the shell, which increases the stability of the pumping and conveying pump.

[0017] Optionally, at least one observation window is provided on the shell.

[0018] By adopting the above technical solution, the observation window can display the filling inside the shell. The staff can view the internal situation of the shell that does not extend into the dissolution cavity and the barrier rock bed in real time through the observation window. When the pumping and delivery pump fails, the fault can be checked to improve work efficiency.

[0019] Optionally, the outlet is connected to a discharge pipe.

[0020] By adopting the above technical solution, the discharge pipe discharges the filling in the dissolution cavity to the outside, so that the filling can be discharged at any position, thereby increasing the convenience of discharge.

[0021] In a second aspect, the present application provides a tunnel cavity pressure reduction construction method using a pumping and delivery pump, which adopts the following technical solution:

[0022] A tunnel cavity pressure reduction construction method using a pumping and delivery pump, comprising the following steps:

[0023] S100, predicting the filling dissolution cavity on the tunnel path;

[0024] S200, after determining the location of the dissolution cavity, opening up the tunnel face at the location corresponding to the dissolution cavity to form a channel;

[0025] S300. Place the pumping and delivery pump into the channel of the tunnel face. The pumping and delivery pump draws out the filling in the cavity to release and reduce the pressure in the cavity.

[0026] By adopting the above technical solution, the pumping and conveying pump connects the dissolution cavity and the tunnel main hole, and the filling in the dissolution cavity is discharged outward through the pumping and conveying pump, thereby reducing the pressure of the dissolution cavity, ensuring the safety of excavation of the main hole in the direction of the dissolution cavity, reducing the occurrence of engineering disasters, and shortening the construction period.

[0027] Optionally, before executing step S300, a sedimentation tank is excavated in the excavation direction of the main tunnel to hold the fillings pumped out of the cavity.

[0028] By adopting the above technical solution, the sedimentation tank precipitates the discharged fillings to separate the mud and water, discharges the separated water, and excavates the separated mud. The setting of the sedimentation tank facilitates the treatment of the cavity fillings and improves work efficiency.

[0029] Optionally, the tunnel cavity depressurization construction method is applicable to the step excavation method.

[0030] By adopting the above technical solution, the steps excavated by the step excavation method can better place the discharge pipe, and the protruding parts of the steps increase the stability of the discharge pipe.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. When the pump is working, it pumps and discharges objects. The separator blocks larger objects from entering the casing, preventing them from clogging the pump and affecting the discharge of objects, thereby improving work efficiency and extending the service life of the pump.

[0033] 2. The pitch of the sorting spiral blade is smaller than that of the conveying spiral blade, which can prevent objects with a size larger than the pitch of the sorting spiral blade from entering the housing. Objects with a size suitable for the pitch of the sorting spiral blade can be smoothly conveyed after entering the housing because the pitch of the conveying spiral blade is larger than that of the sorting spiral blade, preventing larger objects from entering and blocking the housing, ensuring smooth flow inside the housing, reducing the motor load caused by blockage, and improving work efficiency.

[0034] 3. The pumping and delivery pump connects the dissolution cavity and the tunnel main hole. The filling material in the dissolution cavity is discharged outward through the pumping and delivery pump, thereby reducing the pressure of the dissolution cavity, ensuring the safety of excavation of the main hole in the direction of the dissolution cavity, reducing the occurrence of engineering disasters, and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of embodiment 1.

[0036] Figure 2 It is a structural diagram of embodiment 2.

[0037] Figure 3 It is a construction drawing of the tunnel cavity pressure reduction construction method.

[0038] Explanation of the reference numerals: 1. Shell, 11. Inlet, 2. Conveying spiral blade, 3. Driving member, 4. Sorting spiral blade, 5. Center suspension shaft, 6. Observation window, 7. Discharge pipe, 8. Jacking cone, 9. Universal joint, 10. Connecting flange, 20. Screen. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-3 This application is described in further detail.

[0040] The embodiment of the present application discloses a pumping and delivery pump.

[0041] Example 1

[0042] Reference Figure 1A pumping and delivery pump includes a two-section shell 1 and a driving member 3. The driving member 3 is located at one end of the delivery pump. The driving member 3 is a motor. The motor is connected to a reducer. A main shaft connected to the motor and a delivery spiral blade 2 are provided in the shell 1. The delivery spiral blade 2 is fixedly connected to the outer surface of the main shaft. An inlet 11 is respectively provided on two opposite side surfaces of the end of the shell 1 away from the driving member 3. An outlet is provided at the end of the shell 1 close to the driving member 3. The circumferential edge of the inlet 11 is partially recessed so that the inlet 11 is arc-shaped in the length direction of the shell 1.

[0043] One end of the main shaft away from the motor extends to the end of the housing 1 close to the jacking cone 8 and is rotatably connected to the housing 1.

[0044] A connecting flange 10 is provided between the two sections of the shell 1, and the two sections of the shell 1 are fixedly connected by the connecting flange 10. A universal joint 9 is provided at the outlet, and the end of the universal joint 9 away from the shell 1 is connected to the discharge pipe 7 for discharging objects, and the universal joint 9 and the discharge pipe 7 are fixedly connected by the connecting flange 10.

[0045] Objects enter the housing 1 through the two inlets 11 and are transported to the outlet by the transporting spiral blades 2, thereby being discharged.

[0046] The suction and delivery pump also includes a sorting component located in the shell 1 and sorting the size of objects. The sorting component is a sorting spiral blade 4, which is fixedly connected to the outer surface of the main shaft. The sorting spiral blade 4 is located at the inlet 11 and is coaxially fixedly connected to the end of the conveying spiral blade 2 close to the inlet 11. The pitch of the sorting spiral blade 4 is smaller than the pitch of the conveying spiral blade 2, and its outer diameter is larger than the outer diameter of the conveying spiral blade 2, so that the edge of the sorting spiral blade 4 extends out of the two inlets 11, and the sorting spiral blade 4 extends in and out of the inlet 11, reducing the entry space of objects at the inlet 11, thereby better completing the sorting of objects.

[0047] A jacking cone 8 is provided at one end of the housing 1 away from the driving member 3. When the pumping and delivery pump needs to be installed in a blocked channel, the jacking cone can clear the channel, making it easier for the pumping and delivery pump to be installed smoothly in the channel.

[0048] A middle suspension shaft 5 is provided on the shell 1, and the middle suspension shaft 5 includes a clamping cap and a threaded rod fixedly connected to the clamping cap. A through hole is opened on the side of the shell 1 close to the middle suspension shaft 5, and a threaded hole corresponding to the through hole is opened on the conveying spiral blade 2. The threaded rod of the middle suspension shaft 5 passes through the through hole and the threaded hole, and the clamping cap is clamped on the outer side of the shell 1. The shell 1 and the conveying spiral blade 2 are fixedly connected through the middle suspension shaft 5, which increases the stability of the suction and delivery pump.

[0049] If the shell 1 is multi-section, multiple center suspension shafts 5 are added, and a center suspension shaft 5 is placed at intervals on the multi-section shell 1. While increasing the length of the pumping and delivery pump, the stability of the shell 1 and the delivery spiral blade 2 is ensured by the added multiple center suspension shafts 5, avoiding the delivery spiral blade 2 from shaking during operation due to the excessive length of the shell 1.

[0050] Two observation windows 6 are provided on the end of the shell 1 that is not inserted into the channel. The two observation windows 6 are located on the side of the shell 1 away from the outlet. The situation inside the shell 1 can be viewed through the observation windows 6. When the pumping and delivery pump fails, the fault can be promptly checked.

[0051] The sorting spiral blades 4 and the jacking cone 8 are made of a wear-resistant alloy, which can increase the service life of the sorting spiral blades 4 and the jacking cone 8.

[0052] The sorting spiral blade 4 rotates synchronously with the conveying spiral blade 2 .

[0053] The implementation principle of Example 1 is as follows: when the pumping and delivery pump needs to be installed in the channel, the jacking cone 8 clears the blocked channel so that the pumping and delivery pump can be installed smoothly, the motor is turned on, the delivery spiral blade 2 rotates, and the delivery spiral blade 2 drives the sorting spiral blade 4 to rotate. Since the pitch of the sorting spiral blade 4 is smaller than the pitch of the delivery spiral blade 2, the first step of sorting is performed on objects of different sizes by the pitch of the sorting spiral blade 4, and objects with a size smaller than the pitch of the sorting spiral blade 4 are drawn into the sorting spiral blade 4 through the inlet 11; in the second step of sorting, the outer diameter of the sorting spiral blade 4 is larger than the outer diameter of the delivery spiral blade 2, and the edge of the sorting spiral blade 4 extends out of the inlet 11, reducing the space between the inlet 11 and the sorting spiral blade 4, further sorting out objects of suitable size and entering the shell 1, and larger objects are blocked on the outside of the shell 1. The objects entering the shell 1 are transported to the outlet and discharged through the discharge pipe 7.

[0054] The second embodiment is an improvement based on the first embodiment.

[0055] Reference Figure 2 The sorting component is a screen 20 , which replaces the sorting spiral blade 4 , and is installed on the inlet 11 .

[0056] When the pump is installed in the channel, objects that can pass through the screen 20 enter the inlet 11, and objects that cannot pass through the screen 20 are blocked outside the shell, thereby ensuring the normal operation of the pump.

[0057] Reference Figure 3 The arrow in the figure indicates the excavation direction. A tunnel cavity pressure reduction construction method using a pumping and delivery pump comprises the following steps:

[0058] S100, excavating the tunnel main tunnel using a bench excavation method, first predicting and finding the filling cavities in the tunnel main tunnel, and analyzing the karst characteristics of the filling cavities in the direction of the tunnel excavation path;

[0059] S200, after determining the location of the dissolution cavity, drilling is performed on the tunnel face in the main tunnel to connect the excavated space in the main tunnel with the dissolution cavity;

[0060] S210, the connected dissolution cavity discharges filling materials such as water and mud downward through the drilled hole;

[0061] S220, digging a sedimentation tank for containing fillings between the excavation path and the lower step;

[0062] S300: When the filling flow rate in the channel slows down and the flow rate decreases, a pumping and delivery pump is inserted into the channel of the tunnel face, and the pumping and delivery pump is started to pump the filling in the cavity outward through the discharge pipe, thereby reducing the pressure of the cavity and leaving larger objects in the cavity.

[0063] S310: A floating water pump is installed in the sedimentation tank to discharge the water in the upper layer after the filling material is settled, and an excavation device is used to excavate the mud in the lower layer to ensure that there is enough space in the sedimentation tank to accommodate the filling material;

[0064] S320. When the mud discharged from the discharge pipe gradually becomes viscous, stop the pumping and delivery pump, remove the pump from the hole, and then inject mortar, cement, etc. into the cavity through the hole to solidify it in the cavity, stabilize the cavity, and ensure the safety of excavation.

[0065] The discharge pipe 7 is placed on two steps in the main hole, and the protruding parts of the steps increase the stability of the discharge pipe.

[0066] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pumping and delivery pump, comprising at least one housing (1), a delivery spiral blade (2) and a drive member (3), wherein a main shaft is provided in the housing (1), the delivery spiral blade (2) is provided on the outer surface of the main shaft, the delivery spiral blade (2) is located in the housing (1), the drive member (3) is located at one end of the housing (1) and is connected to the delivery spiral blade (2), the housing (1) is provided with at least one inlet (11) and an outlet, and is characterized in that: The pumping and conveying pump further comprises a sorting member located at the inlet (11) for sorting the size of objects, wherein the sorting member is arranged in the housing (1) and is connected to an end of the conveying spiral blade (2) close to the inlet (11); There are two inlets (11), which are respectively arranged on two opposite side surfaces of the shell (1), and the circumferential edges of the inlets (11) are partially recessed so that the inlets (11) are arc-shaped in the longitudinal direction of the shell (1); The sorting member is a sorting spiral blade (4), one end of the main shaft extends in a direction away from the driving member (3), the sorting spiral blade (4) is arranged on the outer surface of the main shaft, and is fixedly connected to one end of the conveying spiral blade (2) near the inlet (11), and the pitch of the sorting spiral blade (4) is smaller than the pitch of the conveying spiral blade (2); The outer diameter of the sorting spiral blade (4) is greater than the outer diameter of the conveying spiral blade (2), and two inlets (11) extend from the edge of the sorting spiral blade (4); Insert the pumping and delivery pump into the channel of the main tunnel face, start the pumping and delivery pump, and pump out the filling in the cavity through the discharge pipe to reduce the pressure of the cavity; The first step of sorting objects of different sizes is performed by the pitch of the sorting spiral blade (4), and objects with a size smaller than the pitch of the sorting spiral blade (4) are drawn into the sorting spiral blade (4) through the inlet (11); in the second step of sorting, the outer diameter of the sorting spiral blade (4) is larger than the outer diameter of the conveying spiral blade (2), and the edge of the sorting spiral blade (4) extends out of the inlet (11), reducing the space between the inlet (11) and the sorting spiral blade (4), further sorting objects of suitable size into the housing (1), while larger objects are blocked outside the housing (1); An jacking cone (8) is provided at one end of the housing (1) away from the driving member (3).

2. A pumping and delivery pump according to claim 1, characterized in that: It also includes at least one central hanging shaft (5), one end of which is located on the outer surface of the shell (1), and the other end of which passes through the outer wall of the shell (1) and is connected to the conveying spiral blade (2).

3. The pumping and delivery pump according to claim 1, characterized in that: At least one observation window (6) is provided on the housing (1).

4. The pumping and delivery pump according to claim 1, characterized in that: The outlet is connected to a discharge pipe (7).

5. A tunnel cavity pressure reduction construction method using a pumping and delivery pump according to any one of claims 1 to 4, comprising the following steps: S100, predicting the filling dissolution cavity on the tunnel path; S200, after determining the location of the dissolution cavity, opening up the tunnel face at the location corresponding to the dissolution cavity to form a channel; S300. Place the pumping and delivery pump into the channel of the tunnel face, and the pumping and delivery pump draws out the filling in the dissolution cavity.

6. The tunnel cavity pressure reduction construction method using a pumping and delivery pump according to claim 5 is characterized by: Before executing step S300, a sedimentation tank is excavated in the excavation direction of the main tunnel to contain the filling material pumped out of the solution cavity.

7. The method for depressurizing a tunnel cavity using a pumping and delivery pump according to claim 5, characterized in that: The tunnel cavity depressurization construction method is suitable for the step excavation method.

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