Soft soil tunnel steel arch mounting device and using method thereof

Abstract

The invention provides a soft soil tunnel steel arch mounting device and a using method thereof. The soft soil tunnel steel arch mounting device comprises a plurality of bottom plates, lifting mounting tables are arranged on the bottom plates, jacking devices are arranged between the bottom plates and the mounting tables, compacting devices are arranged at the bottoms of the bottom plates, each compacting device comprises a settlement sensing device, a jacking device and a jacking rod, and the jacking rods are mounted at the bottoms of the bottom plates. When the bottom of the bottom plate settles, the solid agent extends into the air bag to generate air and increase the pressure of the jacking device so as to fill the bottom of the bottom plate, inclination of the whole device caused by settlement is avoided, and meanwhile, jacking force of the jacking device is transmitted to the bottom plate through the jacking rod so that the bottom plate can bear supporting force of the bottom. And the whole device is further prevented from inclining. A gap between the bottom plate and the tunnel when the tunnel steel frame is installed is avoided, and the phenomena that in the long-term use process of the tunnel, the tunnel foundation is prone to sinking, the overall structure deforms or collapses, the bearing capacity is reduced, and the stability of the tunnel is affected are avoided.

Description

Technical Field

[0001] The invention relates to the field of tunnel construction, and in particular to a soft soil tunnel steel arch frame installation device and a use method thereof. Background Art

[0002] During the construction of weak and large deformation tunnels, timely primary support and enabling the primary support structure to play a supporting role have always been effective measures to limit the deformation of the surrounding rock and ensure construction safety. However, there are inevitably gaps in the installation of tunnel steel frames, and the maximum supporting role of the primary support steel frame can only be played after the deformation reaches a certain degree. At the same time, since it is difficult to accurately control tunnel blasting or excavation, the arch foot of the primary support steel frame is suspended to a certain extent. When supporting, the arch foot support is not dense due to the working space and human factors.

[0003] At the same time, during the long-term use of the initial steel frame, the soft soil tunnel foundation at the bottom of the steel frame is also prone to sinking, and there is a gap between the steel frame and the tunnel. The suspended arch foot may cause the support system to become unstable, and then cause the deformation or collapse of the overall structure. Loose supports may cause subsequent deformation to increase, affecting the long-term use of the tunnel. If the supports are not dense, the force distribution of the arch foot is uneven, which may reduce the bearing capacity and affect the stability of the tunnel. For this reason, we propose a soft soil tunnel steel arch frame installation device and its use method to solve the above problems. Summary of the invention

[0004] The present invention provides a soft soil tunnel steel arch frame installation device and a use method thereof, which solve the problem that tunnel excavation is difficult to accurately control, the arch feet of the initial support steel frame are suspended to a certain extent, and the arch foot support pads installed in the tunnel steel frame have gaps; at the same time, during the long-term use of the steel frame, the soft soil tunnel foundation at the bottom of the steel frame is also prone to sinking, and there is a gap between the steel frame and the tunnel, which is prone to deformation or collapse of the overall structure, affecting the stability of the tunnel.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a soft soil tunnel steel arch frame installation device and its use method, including multiple base plates, a lifting installation platform is provided on the base plate, a jacking device is provided between the base plate and the installation platform, and a compacting device is provided at the bottom of the base plate. The compacting device includes a settlement sensing device, a jacking device and a jacking rod, and the jacking rod is installed at the bottom of the base plate.

[0006] In the preferred solution, a plurality of threaded holes are provided at the bottom of the base plate, a threaded through hole is provided on one side of the threaded hole, connection boxes are provided at both ends of the base plate, the connection boxes on adjacent base plates are connected by connecting channel steels, and a plurality of pillars are provided on the top of the base plate.

[0007] In a preferred embodiment, the mounting platform includes a flat plate, a plurality of hollow outer rods are provided at the bottom of the flat plate, a rotating ball joint is provided between the outer rod and the flat plate, a tapered thread is provided at one end of the outer rod, a plurality of notches are provided on the threaded end of the outer rod, the support pillar abuts against the outer rod, a fastening nut is provided on the tapered thread of the outer rod, a top rod is provided at the bottom of the mounting platform, and a second rotating ball joint is provided between the top rod and the flat plate.

[0008] In the preferred embodiment, the lifting device includes a hollow outer sleeve and an inner sleeve. The outer sleeve is provided with a screw seat, which is rotatably connected to the outer sleeve. The screw seat is provided with a first tapered thread, the first tapered thread is provided with a meshing second tapered thread, and the second tapered thread is provided with a handle.

[0009] In a preferred solution, a screw rod is provided on the screw rod seat, the inner sleeve is threadedly connected to the screw rod, one end of the screw rod is rotatably connected to the outer sleeve column, and the top of the inner sleeve is connected to the push rod.

[0010] In the preferred embodiment, the sedimentation sensing device includes a cylinder and a sensing rod. A sliding column is provided on the cylinder. One end of the sliding column is connected to the sensing rod through a transmission rod. A spring is provided between the sliding column and the cylinder. A flat-bottomed hole is provided on the top of the sliding column. A solid agent is provided at the bottom of the transmission rod.

[0011] In the preferred solution, a plurality of slide grooves are provided on the cylinder body, a plurality of protrusions are provided at the bottom of the slide column, the protrusions rest on the slide grooves, a hinge column is provided on the top of the slide column, the hinge column is connected to the transmission rod, a hinge seat is provided on the top of the cylinder body, a cross bar is provided on the hinge seat, a transmission groove is provided on the transmission rod, and the hinge seat rests on the transmission groove.

[0012] In the preferred solution, the top pressure device includes a top box, which is provided with a through hole, the transmission rod is against the through hole, a sliding telescopic box is provided at the bottom of the top box, an airbag is provided in the top pressure device, and the two ends of the airbag telescopic box are respectively connected to the top box and the telescopic box, and the airbag is provided with chemical reagents.

[0013] In a preferred solution, the lifting rod comprises a hollow rod, a side groove is provided on one side of the hollow rod, the transmission rod moves in the side groove, a locking plate is provided on the top of the hollow rod, the locking plate is connected to the threaded hole, and the bottom of the hollow rod abuts against the top box; A pre-stressing device is provided on the bottom plate, which includes a pre-stressing rod and a threaded column. The threaded column is connected to the threaded through hole. One end of the pre-stressing rod abuts against the flat bottom hole. The threaded column is provided with a second threaded hole and multiple rotating knobs, and the pre-stressing rod is provided with a second thread.

[0014] A method for using a steel arch frame installation device for a soft soil tunnel, comprising the following steps: S1, excavating a soft soil tunnel and pre-connecting a steel frame: digging a pit at the bottom of the soft soil tunnel for installing a compaction device; S2. Install the bottom plate on the soft soil tunnel, connect the jacking rod to the bottom plate, so that the jacking device is installed at the bottom of the bottom plate, the preloading rod of the preloading device is pressed against the flat bottom hole, and the threaded column is disconnected from the bottom plate; S3. Pre-press the settlement sensing device: add soil into the threaded through hole so that the top of the settlement sensing device is filled with soil, rotate the threaded column so that the threaded column is installed on the bottom plate, rotate the pre-pressing rod so that the pre-pressing rod is pulled out of the bottom plate, and seal the second threaded hole with a plug or a bolt; S4. Adjust the height of the mounting platform: loosen multiple fastening nuts and turn the handle of the lifting device to raise or lower the mounting platform until the mounting platform reaches the pre-installation position; S5. Connect the mounting platform in place: Turn several fastening nuts to make the outer rod hold the support tightly, so that the mounting platform is at the right height; S6. The overall support is connected in place: both ends of the connecting channel steel are inserted into the connecting box, and the fastening bolts are installed on the connecting box and penetrate the connecting box and the connecting channel steel until all the channel steels on the bottom plate are connected.

[0015] The beneficial effects of the present invention are as follows: the bottom plate of the device of the present invention is connected to the bottom of the tunnel, and the bottom plate support and the jacking of the mounting platform can be carried out simply and quickly. The newly installed extended bottom plate is pre-pressed and jacked, and a certain prestress is applied to eliminate the gap of the newly installed bottom plate, so that the bottom plate support is densely packed with arch feet, and the arch feet are prevented from being suspended due to the loose bottom plate support, so that the support of the steel frame can be brought into play as soon as possible. At the same time, the suspension and settlement of the previous section of the steel frame can be corrected and strengthened to enhance the bearing capacity of the initial support.

[0016] This device can lift the installation platform immediately after the initial support of the tunnel is installed, eliminating the gap in the steel frame installation. At the same time, the bottom of the arch foot is strengthened and compacted, eliminating the hidden dangers of the arch foot support pad not being in place in conventional operations, limiting the deformation of the bottom of the tunnel, and conforming to the concept of "fast support" for soft layer large deformation tunnels. The lifting device is easy to operate and has a simple structure. It can quickly extend and retract the height of the installation platform. The structure of the fastening nut and the outer rod can further lock the height of the installation platform. It further prevents the installation platform from shaking and reduces the impact of the initial settlement or deformation of the steel frame.

[0017] The bottom of this device uses an enlarged base plate and is equipped with detachable connecting channel steel. Through the connecting channel steel, multiple devices can be linked to form a whole, forming a longitudinal strip foundation at the arch foot of the steel frame constructed in a single time, expanding the arch foot stress area, reducing the arch foot support stress, minimizing the initial settlement of the primary support steel frame, and limiting the deformation of the soft layer. The flat plate can rotate around the rotating ball joint and is suitable for connecting steel plates at various angles; the structure is simple and light, easy to process, and can be obtained from the construction site. Most connections can be welded at one time, which is simple to make; the overall device is lightweight, easy to install and operate, and can be recycled, with controllable costs.

[0018] When the bottom of the base plate settles, the soil pressure near the settlement sensing device decreases, and the sliding column slides relative to the cylinder under the action of the spring to rotate the transmission rod, so that the solid agent extends into the airbag, so that the solid agent reacts with the chemical reagent to produce gas, increase the pressure of the top pressure device, and fill the bottom of the base plate to avoid the tilt of the entire device caused by settlement. At the same time, the lifting force of the top pressure device is transmitted to the base plate through the lifting rod, so that the base plate can be supported by the bottom force, further avoiding the tilt of the entire device. Avoid the gap between the base plate and the tunnel when the tunnel steel frame is installed, and avoid the tunnel foundation from sinking easily during the long-term use of the tunnel. There is a gap between the steel frame and the tunnel, and the force distribution is uneven, which is easy to cause deformation or collapse of the overall structure, reducing the bearing capacity and affecting the stability of the tunnel.

[0019] When the pressure in the airbag is too high, the pressure causes the sensing rod to rise, and the solid agent moves away from the chemical reagent, so that the reaction in the airbag stops, and the compacting device can adjust the elongation of the pressing device back and forth and adjust the lifting force of the lifting rod on the bottom plate.

[0020] The pre-pressing device can disconnect the threaded column and the base plate when the compacting device is installed, so that the settlement sensing device can be filled and pre-pressed on the top without being triggered. After the filling and pre-pressing are completed, the threaded column can be quickly installed on the base plate and the pre-pressing rod can be pulled out. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a front view of the overall structure of the present invention; Figure 2 It is a front view of the local structure of the present invention; Figure 3 It is a top view of the local structure of the present invention; Figure 4 is an axial side view of the compacting device of the present invention; Figure 5 It is an axonometric view of a local structure of the present invention; Figure 6 It is an exploded view of a local structure of the present invention; Figure 7 is a cross-sectional view of the compacting device of the present invention; Figure 8 The present invention Figure 7 A magnified view of center A; Fig. 9 is an axial side view of the preloading device of the present invention; Fig.10 is an axial side view of the jacking device of the present invention; In the figure: bottom plate 1; threaded hole 101; threaded through hole 102; mounting platform 2; flat plate 201; rotating ball joint 202; outer rod 203; fastening nut 204; top rod 205; pillar 3; compacting device 4; settlement sensing device 5; cylinder 501; slide groove 5011; hinge seat 5012; slide column 502; flat bottom hole 5021; convex block 5022; hinge column 5023; spring 503; transmission rod 504; transmission groove 5041; sensing rod 505; top pressure device 6; top box 601; telescopic Box 602; through hole 603; mosaic block 604; lifting rod 7; hollow rod 701; locking plate 702; side groove 703; pre-stressing device 8; pre-stressing rod 801; second thread 8011; threaded column 802; rotating knob 8021; second threaded hole 8022; lifting device 9; screw seat 901; first tapered thread 902; second tapered thread 903; handle 904; screw 905; inner sleeve 906; connecting channel steel 10; connecting box 11; air bag 12; air bag mouth 1201; solid dosage 13. DETAILED DESCRIPTION

[0022] Embodiment 1: like Figure 1-10 In the invention, a soft soil tunnel steel arch frame installation device and its use method are provided, including a plurality of bottom plates 1, a lifting installation platform 2 is provided on the bottom plate 1, a lifting device 9 is provided between the bottom plate 1 and the installation platform 2, a compacting device 4 is provided at the bottom of the bottom plate 1, and the compacting device 4 includes a settlement sensing device 5, a jacking device 6 and a lifting rod 7, and the lifting rod 7 is installed at the bottom of the bottom plate 1. With this structure, the bottom plate 1 of the device of the present invention is connected to the bottom of the tunnel, and the support of the bottom plate 1 and the lifting of the installation platform 2 can be carried out simply and quickly. The newly installed and extended bottom plate 1 is pre-pressed and lifted, and a certain prestress is applied, which can eliminate the gap of the newly installed bottom plate 1, so that the bottom plate 1 supports the arch foot densely, avoids the arch foot being suspended due to the loose support of the bottom plate 1, and plays the supporting role of the steel frame as soon as possible. At the same time, the suspension and settlement of the previous section of the steel frame can be corrected and strengthened to enhance the initial support bearing capacity.

[0023] This device can lift the mounting platform 2 immediately after the initial support of the tunnel is installed, eliminating the gap in the steel frame installation. At the same time, the bottom of the arch foot is strengthened and compacted, eliminating the hidden dangers of the arch foot support pad not being in place during conventional operations, limiting the deformation of the bottom of the tunnel, and meeting the concept of "fast support" for soft layer large deformation tunnels. The lifting device 9 is easy to operate and has a simple structure, and can quickly extend and retract the height of the mounting platform 2. The structure of the fastening nut 204 and the outer rod 203 can further lock the height of the mounting platform 2. It further prevents the mounting platform 2 from shaking and reduces the impact of the initial settlement or deformation of the steel frame.

[0024] The bottom of the device adopts an enlarged base plate 1 and is equipped with a detachable connecting channel steel 10. Through the connecting channel steel 10, multiple devices can be linked to form a whole, forming a longitudinal strip foundation at the arch foot of the steel frame constructed in a single time, expanding the arch foot stress area, reducing the arch foot support stress, minimizing the initial settlement of the primary support steel frame, and limiting the deformation of the soft layer. The flat plate 201 can rotate around the rotating ball joint 202 and is suitable for connecting steel plates at various angles; the structure is simple and light, easy to process, and can be obtained from the construction site. Most connections can be welded at one time, which is simple to make; the overall device is lightweight, easy to install and operate, and can be recycled, with controllable costs.

[0025] When the bottom of the bottom plate 1 sinks, the soil pressure near the sinking sensing device 5 decreases, and the sliding column 502 slides relative to the cylinder 501 under the action of the spring 503, so that the transmission rod 504 rotates, so that the solid agent 13 extends into the airbag 12, so that the solid agent 13 reacts with the chemical reagent to produce gas, thereby increasing the pressure of the top pressure device 6 to fill the bottom of the bottom plate 1, and avoid the sinking and tilting of the whole device. At the same time, the lifting force of the top pressure device 6 is transmitted to the bottom plate 1 through the lifting rod 7, so that the bottom plate 1 can be supported by the bottom, further avoiding the tilting of the whole device.

[0026] When the pressure in the airbag 12 is too high, the pressure causes the sensing rod 505 to rise, and the solid agent 13 moves away from the chemical reagent, so that the reaction in the airbag 12 stops, so that the compacting device 4 can adjust the extension of the pressing device 6 back and forth and adjust the lifting force of the lifting rod 7 on the bottom plate 1.

[0027] The pre-pressing device 8 can disconnect the threaded column 802 and the base plate 1 when the compacting device 4 is installed, so that the settlement sensing device 5 can be filled and pre-pressed on the top in an untriggered state. After the filling and pre-pressing are completed, the threaded column 802 can be quickly installed on the base plate 1, and the pre-pressing rod 801 can be pulled out. The structure is simple and the operation is convenient.

[0028] In the preferred solution, a plurality of threaded holes 101 are provided at the bottom of the base plate 1, a threaded through hole 102 is provided on one side of the threaded hole 101, connecting boxes 11 are provided at both ends of the base plate 1, the connecting boxes 11 on adjacent base plates 1 are connected by connecting channel steels 10, and a plurality of pillars 3 are provided on the top of the base plate 1.

[0029] In the preferred solution, the mounting platform 2 includes a flat plate 201, a plurality of hollow outer rods 203 are provided at the bottom of the flat plate 201, a rotating ball joint 202 is provided between the outer rod 203 and the flat plate 201, a tapered thread is provided at one end of the outer rod 203, a plurality of notches are provided on the threaded end of the outer rod 203, the pillar 3 abuts against the outer rod 203, a fastening nut 204 is provided on the tapered thread of the outer rod 203, a top rod 205 is provided at the bottom of the mounting platform 2, and a second rotating ball joint is provided between the top rod 205 and the flat plate 201. With this structure, the device can lift the mounting platform 2 immediately after the initial support installation of the tunnel, eliminate the gap in the installation of the steel frame, and at the same time, strengthen the arch foot at the bottom to make it dense, eliminate the hidden danger of the arch foot support pad not being in place in conventional operations, limit the deformation of the bottom of the tunnel, and meet the concept of "fast support" for soft layer large deformation tunnels. The lifting device 9 is easy to operate, simple in structure, and can quickly extend and retract the height of the mounting platform 2. The structure of the fastening nut 204 and the outer rod 203 can further lock the height of the mounting platform 2. The installation platform 2 is further prevented from shaking, and the influence of the initial settlement or deformation of the steel frame is reduced.

[0030] In the preferred solution, the lifting device 9 includes a hollow outer sleeve and an inner sleeve 906, the outer sleeve is provided with a screw seat 901, the screw seat 901 is rotatably connected to the outer sleeve, the screw seat 901 is provided with a first tapered thread 902, the first tapered thread 902 is provided with a meshing second tapered thread 903, and the second tapered thread 903 is provided with a handle 904. With this structure, the lifting device 9 is easy to operate, simple in structure, and can quickly extend and retract the height of the mounting platform 2. The structure of the fastening nut 204 and the outer sleeve 203 can further lock the height of the mounting platform 2. Further prevent the mounting platform 2 from shaking, and reduce the impact of the initial settlement or deformation of the steel frame.

[0031] In a preferred solution, a screw rod 905 is provided on the screw rod seat 901, an inner sleeve 906 is threadedly connected to the screw rod 905, one end of the screw rod 905 is rotatably connected to the outer sleeve, and the top of the inner sleeve 906 is connected to the top rod 205. According to this structure, the handle 904 is rotated to rotate the second tapered thread 903, so that the first tapered thread 902 is rotated, so that the screw rod 905 is rotated, so that the inner sleeve 906 is extended and retracted.

[0032] In the preferred embodiment, the sedimentation sensing device 5 includes a cylinder 501 and a sensing rod 505, a sliding column 502 is provided on the cylinder 501, one end of the sliding column 502 is connected to the sensing rod 505 through a transmission rod 504, a spring 503 is provided between the sliding column 502 and the cylinder 501, a flat-bottomed hole 5021 is provided on the top of the sliding column 502, and a solid agent 13 is provided at the bottom of the transmission rod 504.

[0033] In the preferred embodiment, a plurality of slide grooves 5011 are provided on the cylinder 501, a plurality of protrusions 5022 are provided at the bottom of the slide column 502, the protrusions 5022 abut against the slide grooves 5011, a hinge column 5023 is provided at the top of the slide column 502, the hinge column 5023 is connected to the transmission rod 504, a hinge seat 5012 is provided at the top of the cylinder 501, a cross bar is provided on the hinge seat 5012, a transmission groove 5041 is provided on the transmission rod 504, and the hinge seat 5012 abuts against the transmission groove 5041. With this structure, when the bottom of the base plate 1 sinks, the soil pressure near the sinking sensing device 5 decreases, and the sliding column 502 slides relative to the cylinder 501 under the action of the spring 503 to rotate the transmission rod 504, so that the solid agent 13 extends into the airbag 12, so that the solid agent 13 reacts with the chemical reagent to produce gas, thereby increasing the pressure of the top pressure device 6 to fill the bottom of the base plate 1, thereby preventing the entire device from tilting due to sinking. At the same time, the lifting force of the top pressure device 6 is transmitted to the base plate 1 through the lifting rod 7, so that the base plate 1 can be supported by the bottom force, thereby further preventing the entire device from tilting.

[0034] In the preferred solution, the top pressure device 6 includes a top box 601, a through hole 603 is provided on the top box 601, a transmission rod 504 is against the through hole 603, a sliding telescopic box 602 is provided at the bottom of the top box 601, and an air bag 12 is provided in the top pressure device 6. The ends of the telescopic box 602 of the air bag 12 are respectively connected to the top box 601 and the telescopic box 602, and the air bag 12 is provided with a chemical reagent. According to this structure, the solid agent 13 is sodium bicarbonate, and the chemical reagent is aluminum sulfate liquid. Sodium bicarbonate and aluminum sulfate liquid produce a large amount of carbon dioxide. Sodium bicarbonate is fixed at one end of the sensing rod 505, and one end of the sensing rod 505 is arc-shaped, which increases the contact area with the aluminum sulfate liquid and is quickly inflated.

[0035] The telescopic box 602 is provided with a plurality of inlay blocks 604 , and the top box 601 is provided with a plurality of vertical inlay grooves inside, and the inlay blocks 604 are against the inlay grooves.

[0036] In a preferred solution, the lifting rod 7 includes a hollow rod 701, a side groove 703 is provided on one side of the hollow rod 701, the transmission rod 504 moves in the side groove 703, a locking plate 702 is provided on the top of the hollow rod 701, the locking plate 702 is connected to the threaded hole 101, and the bottom of the hollow rod 701 is against the top box 601; The bottom plate 1 is provided with a pre-pressing device 8, which includes a pre-pressing rod 801 and a threaded column 802, the threaded column 802 is connected to the threaded through hole 102, one end of the pre-pressing rod 801 is against the flat bottom hole 5021, the threaded column 802 is provided with a second threaded hole 8022 and a plurality of rotating knobs 8021, and the pre-pressing rod 801 is provided with a second thread 8011. With this structure, the airbag 12 is provided with an airbag opening 1201, and the solid dosage 13 extends into the airbag opening 1201.

[0037] When the pressure in the airbag 12 is too high, the pressure causes the sensing rod 505 to rise, and the solid agent 13 moves away from the chemical reagent, so that the reaction in the airbag 12 stops, so that the compacting device 4 can adjust the extension of the pressing device 6 back and forth and adjust the lifting force of the lifting rod 7 on the bottom plate 1.

[0038] The pre-pressing device 8 can disconnect the threaded column 802 and the base plate 1 when the compacting device 4 is installed, so that the settlement sensing device 5 can be filled and pre-pressed on the top in an untriggered state. After the filling and pre-pressing are completed, the threaded column 802 can be quickly installed on the base plate 1, and the pre-pressing rod 801 can be pulled out. The structure is simple and the operation is convenient.

[0039] Embodiment 2: Further described in conjunction with Example 1: A method for using a steel arch frame installation device for a soft soil tunnel, the steps of which are: comprising S1, excavating a soft soil tunnel and pre-connecting the steel frame: digging a pit at the bottom of the soft soil tunnel for installing a compaction device 4; S2. Install the bottom plate 1 on the soft soil tunnel, connect the jacking rod 7 to the bottom plate 1, so that the jacking device 6 is installed at the bottom of the bottom plate 1, the preloading rod 801 of the preloading device 8 is pressed on the flat bottom hole 5021, and the threaded column 802 is disconnected from the bottom plate 1; S3, pre-pressing the settlement sensing device 5: filling soil into the threaded through hole 102 so that the top of the settlement sensing device 5 is filled with soil, rotating the threaded column 802 so that the threaded column 802 is installed on the bottom plate 1, rotating the pre-pressing rod 801 so that the pre-pressing rod 801 is pulled out of the bottom plate 1, and sealing the second threaded hole 8022 with a plug or a bolt; S4, adjusting the height of the mounting platform 2: loosen the multiple fastening nuts 204, and turn the handle 904 of the jacking device 9 to raise and lower the mounting platform 2 until the mounting platform 2 reaches the pre-installation position; S5, the mounting platform 2 is connected in place: the plurality of fastening nuts 204 are rotated to make the outer sleeve rod 203 hold the support 3 tightly, so that the mounting platform 2 is in place at the right height; S6. The whole support is connected in place: both ends of the connecting channel steel 10 are inserted into the connecting box 11, and fastening bolts are installed on the connecting box 11 to penetrate the connecting box 11 and the connecting channel steel 10 until all the channel steels 10 on the bottom plate 1 are connected.

[0040] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A soft soil tunnel steel arch installation device, characterized by: The invention comprises a plurality of base plates (1), each base plate (1) being provided with a lifting mounting platform (2), a lifting device (9) being provided between the base plate (1) and the mounting platform (2), a compacting device (4) being provided at the bottom of the base plate (1), the compacting device (4) comprising a settlement sensing device (5), a pressing device (6) and a lifting rod (7), and the lifting rod (7) being installed at the bottom of the base plate (1).

2. The soft soil tunnel steel arch installation device according to claim 1 is characterized in that: A plurality of threaded holes (101) are provided at the bottom of the base plate (1), a threaded through hole (102) is provided on one side of the threaded hole (101), connection boxes (11) are provided at both ends of the base plate (1), the connection boxes (11) on adjacent base plates (1) are connected via connecting channel steels (10), and a plurality of pillars (3) are provided at the top of the base plate (1).

3. The soft soil tunnel steel arch installation device according to claim 1 is characterized by: The mounting platform (2) comprises a flat plate (201), a plurality of hollow outer rods (203) are provided at the bottom of the flat plate (201), a swivel ball joint (202) is provided between the outer rod (203) and the flat plate (201), a tapered thread is provided at one end of the outer rod (203), a plurality of notches are provided on the threaded end of the outer rod (203), a support (3) abuts against the outer rod (203), a fastening nut (204) is provided on the tapered thread of the outer rod (203), a top rod (205) is provided at the bottom of the mounting platform (2), and a second swivel ball joint is provided between the top rod (205) and the flat plate (201).

4. The soft soil tunnel steel arch installation device according to claim 1 is characterized by: The lifting device (9) comprises a hollow outer sleeve and an inner sleeve (906); a screw seat (901) is provided on the outer sleeve; the screw seat (901) is rotatably connected to the outer sleeve; a first tapered thread (902) is provided on the screw seat (901); a meshing second tapered thread (903) is provided on the first tapered thread (902); and a handle (904) is provided on the second tapered thread (903).

5. The soft soil tunnel steel arch installation device according to claim 4 is characterized by: A screw rod (905) is provided on the screw rod seat (901), an inner sleeve (906) is threadedly connected to the screw rod (905), one end of the screw rod (905) is rotatably connected to the outer sleeve column, and the top of the inner sleeve (906) is connected to the ejector rod (205).

6. The soft soil tunnel steel arch installation device according to claim 1 is characterized by: The sedimentation sensing device (5) comprises a cylinder (501) and a sensing rod (505). A sliding column (502) is provided on the cylinder (501). One end of the sliding column (502) is connected to the sensing rod (505) via a transmission rod (504). A spring (503) is provided between the sliding column (502) and the cylinder (501). A flat-bottomed hole (5021) is provided on the top of the sliding column (502). A solid agent (13) is provided on the bottom of the transmission rod (504).

7. The soft soil tunnel steel arch installation device according to claim 6 is characterized by: A plurality of slide grooves (5011) are provided on the cylinder (501), a plurality of protrusions (5022) are provided at the bottom of the slide column (502), the protrusions (5022) abut against the slide grooves (5011), a hinge column (5023) is provided at the top of the slide column (502), the hinge column (5023) is connected to the transmission rod (504), a hinge seat (5012) is provided at the top of the cylinder (501), a cross bar is provided on the hinge seat (5012), a transmission groove (5041) is provided on the transmission rod (504), and the hinge seat (5012) abuts against the transmission groove (5041).

8. The soft soil tunnel steel arch installation device according to claim 1 is characterized by: The top pressing device (6) comprises a top box (601), the top box (601) is provided with a through hole (603), the transmission rod (504) is against the through hole (603), a sliding telescopic box (602) is provided at the bottom of the top box (601), an air bag (12) is provided in the top pressing device (6), two ends of the telescopic box (602) of the air bag (12) are respectively connected to the top box (601) and the telescopic box (602), and the air bag (12) is provided with a chemical reagent.

9. The soft soil tunnel steel arch installation device according to claim 1 is characterized by: The lifting rod (7) comprises a hollow rod (701), a side groove (703) is provided on one side of the hollow rod (701), the transmission rod (504) moves in the side groove (703), a locking plate (702) is provided on the top of the hollow rod (701), the locking plate (702) is connected to the threaded hole (101), and the bottom of the hollow rod (701) is against the top box (601); A pre-pressing device (8) is provided on the bottom plate (1), the pre-pressing device (8) comprising a pre-pressing rod (801) and a threaded column (802), the threaded column (802) being connected to the threaded through hole (102), one end of the pre-pressing rod (801) being against the flat bottom hole (5021), a second threaded hole (8022) and a plurality of rotating knobs (8021) being provided on the threaded column (802), and a second thread (8011) being provided on the pre-pressing rod (801).

10. A method for using a soft soil tunnel steel arch frame installation device according to any one of claims 1 to 9, the steps comprising: S1, excavating a soft soil tunnel and pre-connecting the steel frame: digging a pit at the bottom of the soft soil tunnel for installing the compaction device (4); S2, a bottom plate (1) is installed on the soft soil tunnel, and the jacking rod (7) is connected to the bottom plate (1), so that the jacking device (6) is installed at the bottom of the bottom plate (1), the preloading rod (801) of the preloading device (8) is pressed against the flat bottom hole (5021), and the threaded column (802) is disconnected from the bottom plate (1); S3, pre-pressing the settlement sensing device (5): filling soil into the threaded through hole (102) so that the top of the settlement sensing device (5) is filled with soil, rotating the threaded column (802) so that the threaded column (802) is installed on the bottom plate (1), rotating the pre-pressing rod (801) so that the pre-pressing rod (801) is pulled out of the bottom plate (1), and sealing the second threaded hole (8022) with a plug or a bolt; S4, adjusting the height of the mounting platform (2): loosening a plurality of fastening nuts (204), and turning a handle (904) of the lifting device (9) to raise or lower the mounting platform (2) until the mounting platform (2) reaches a pre-installation position; S5, the mounting platform (2) is connected in place: a plurality of fastening nuts (204) are rotated to make the outer sleeve rod (203) hold the support (3) tightly, so that the mounting platform (2) is at the right height; S6. The overall support is connected in place: both ends of the connecting channel steel (10) are inserted into the connecting box (11), and fastening bolts are installed on the connecting box (11) and penetrate the connecting box (11) and the connecting channel steel (10) until all the channel steels (10) on the bottom plate (1) are connected.

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