Soil pressure monitoring device for pipe jacking construction and installation method thereof

Abstract

The present invention provides a soil pressure monitoring device for pipe jacking construction and an installation method thereof, and relates to the field of soil pressure monitoring. The soil pressure monitoring device for pipe jacking construction comprises a protection box, a soil pressure detection element and a lead tube, wherein a receiving cavity for accommodating the soil pressure detection element is provided in the protection box, and an elastic positioning structure for positioning and cooperating with the soil pressure detection element is provided inside the protection box; a sealing cover is detachably installed on the protection box, and the sealing cover is used for installation during pre-buried construction and removal during monitoring and use; a wire outlet hole is also provided on the protection box, and the lead tube is connected to the wire outlet hole, and the lead tube is a length-adjustable tube body; a cable is installed in the lead tube, one end of the cable is electrically connected to the soil pressure detection element, and the other end of the cable passes through the lead tube and is electrically connected to a wireless signal transmitter; the wireless signal transmitter is used to receive the soil pressure electrical signal emitted by the soil pressure detection element, and convert the soil pressure electrical signal into a wireless signal to send the soil pressure wireless signal outward.

Description

Technical Field

[0001] The invention relates to the technical field of soil pressure monitoring, and in particular to a soil pressure monitoring device for pipe jacking construction and an installation method thereof. Background Art

[0002] Pipe jacking technology is a non-excavation tunneling technology that is widely used in underground engineering construction such as integrated pipe corridors. During pipe jacking construction and operation, the interaction force between the pipe jacking section and the surrounding soil needs to be monitored to determine the jacking parameters of the pipe section and the construction safety.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN204831667U and the authorization announcement date 2015.12.02 discloses a protective device for monitoring water and soil pressure of mud water balance pipe under high water conditions, which specifically includes a movable base, a hollow screw, a hollow casing, a screw hole, a soil pressure gauge, and a detector; wherein, the movable base is a U-shaped groove structure, the hollow screw is arranged at the bottom of the U-shaped groove structure of the movable base, and a soil pressure gauge is fixed in the middle of the hollow screw, and the soil pressure gauge is connected to the detector through a cable. During the initialization process, the soil pressure gauge is slightly recessed into the pipe wall by adjusting the height of the movable base; after the soil pressure gauge safely passes through the water-stop curtain, the height of the movable base is adjusted again so that the outermost side of the soil pressure gauge is in the same plane with the pipe wall, and the soil pressure gauge transmits the detection data to the detector, thereby accurately monitoring the natural water and soil pressure.

[0004] In the prior art, the earth pressure monitoring device needs to be pre-buried in the jacking pipe segment in advance. When pouring concrete, it will flow into the movable base and cover the earth pressure gauge, making it impossible to accurately monitor the external earth pressure of the pipe segment, resulting in the failure of earth pressure monitoring. Moreover, pipe segments and earth pressure gauges of different sizes need to be customized, which increases the installation cost of the monitoring device. Existing jacking tunnels are generally hundreds of meters long. In the past, the traction and laying of the earth pressure box cables took up a lot of manpower and time, and the frequency of manual monitoring was low, which was not conducive to capturing the real-time stress state of the pipe segment during construction or operation. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a soil pressure monitoring device for jacking pipe construction and an installation method thereof, so as to solve the problem that the soil pressure gauge will be covered when pouring concrete, and the external soil pressure of the pipe segment cannot be accurately monitored, resulting in failure of soil pressure monitoring; moreover, customized designs are required for pipe segments and soil pressure gauges of different sizes, which increases the installation cost of the monitoring device. In the past, the traction and layout of the soil pressure box cables took up a lot of manpower and time.

[0006] The technical solution of the soil pressure monitoring device for pipe jacking construction of the present invention is:

[0007] The soil pressure monitoring device for pipe jacking construction comprises a protection box, a soil pressure detection element and a lead tube, wherein the protection box is provided with a receiving cavity for accommodating the soil pressure detection element, and an elastic positioning structure is provided inside the protection box, and the elastic positioning structure is positioned and matched with the soil pressure detection element;

[0008] The protection box is provided with a detachable sealing cover, which is used for installation during pre-embedded construction and removal during monitoring. The protection box is also provided with a wire outlet hole, and the lead-in tube is connected to the wire outlet hole. The lead-in tube is a tube body with adjustable length.

[0009] A cable is inserted into the lead tube, one end of the cable is electrically connected to the soil pressure detection element, and the other end of the cable passes through the lead tube and is electrically connected to a wireless signal transmitter;

[0010] The wireless signal transmitter is used to receive the earth pressure electrical signal sent by the earth pressure detection element, and convert the earth pressure electrical signal into a wireless signal to send the earth pressure wireless signal outward.

[0011] Furthermore, a sealing plug or a wire outlet plug is detachably installed at the end of the lead-in tube away from the protection box. The sealing plug is used to be installed during pre-buried construction to seal the lead-in tube; the wire outlet plug is used to replace the sealing plug during monitoring use to allow the other end of the cable to be led out.

[0012] Furthermore, the protection box includes a box bottom and side walls, the side walls are arranged around the edge of the box bottom to form the accommodating cavity, and the wire outlet hole is arranged on the box bottom.

[0013] Furthermore, the elastic positioning structure includes at least two elastic members, the soil pressure detection element is arranged in the middle of the protection box, and at least two of the elastic members are respectively connected between the soil pressure detection element and the side wall.

[0014] Furthermore, the elastic member is a cylindrical compression spring, and four cylindrical compression springs are provided. The four cylindrical compression springs are distributed symmetrically about the center of the soil pressure detection element, and a positioning plate is provided at the end of the cylindrical compression spring, and the positioning plate is concavely matched with the outer contour of the soil pressure detection element.

[0015] Furthermore, the upper edge of the positioning plate is lower than the upper edge of the protection box, and the sum of the height of the positioning plate and the thickness of the sealing cover is less than the height of the accommodating cavity.

[0016] Furthermore, the lead tube includes at least two tube sections, and two adjacent tube sections are threadedly connected.

[0017] Furthermore, the lead-in tube includes a first tube section and a second tube section, the first tube section is provided with an external thread, the end of the second tube section is provided with an internal thread matching the external thread, and the wire outlet hole is provided with an internal thread hole matching the external thread.

[0018] The technical solution of the installation method of the soil pressure monitoring device for pipe jacking construction of the present invention is:

[0019] The installation method of the soil pressure monitoring device for pipe jacking construction includes the following steps:

[0020] Step 1: Before pouring concrete into the pipe section, first determine the monitoring point location for installing the earth pressure monitoring device in the steel cage, and adjust the length of the lead pipe to match the thickness of the pipe section at the monitoring point;

[0021] Step 2: Fix the earth pressure monitoring device in the steel cage so that the extension direction of the earth pressure monitoring device is arranged along the wall thickness direction of the pipe segment; install a sealing cover on the protection box, and install a sealing plug at the end of the lead pipe away from the protection box;

[0022] Step 3: After the earth pressure monitoring device is fixed, pour concrete;

[0023] Step 4: After the concrete curing is completed, the top pipe section is removed from the mold, the sealing cover and the sealing plug are removed, the earth pressure detection element is fixed in the accommodating cavity, and the cable is passed through the outlet hole and the lead pipe, and the outlet plug is installed at the end of the lead pipe away from the protection box;

[0024] Step 5. Electrically connect the other end of the cable to the wireless signal transmitter. The wireless signal transmitter is equipped with a power supply. Install the wireless signal transmitter and the power supply on the inner wall of the jacking pipe section. The wireless signal transmitter sends out a wireless signal of soil pressure, and the data is received, recorded and read by a computer.

[0025] Furthermore, in step 1, the length of the lead tube is adjusted so that the upper edge of the protection box is flush with the outer wall of the top pipe section, and the end of the lead tube away from the protection box is flush with the inner wall of the top pipe section;

[0026] In step 4, after installing the cables, fill the lead-in tube with polyurethane water-swellable waterproofing glue, and fill the gap between the soil pressure detection element and the protection box and the inside of the outlet hole with quick-setting cement.

[0027] Beneficial effects: The soil pressure monitoring device for pipe jacking construction adopts a structural design of a protection box, a soil pressure detection element, a lead tube and a wireless signal transmitter. During pre-buried construction, the protection box is installed on the outer wall of the pipe jacking section. The sealing cover is first installed on the protection box to seal the accommodating cavity to prevent concrete from entering the protection box and affecting the subsequent installation of the soil pressure detection element, thereby avoiding the problem of soil pressure monitoring failure. After the soil pressure monitoring device is installed in place and the casting of the pipe jacking section is completed, the sealing cover is removed to open the accommodating cavity, and the soil pressure detection element is installed in the protection box so that the soil pressure detection element is directly exposed to the outside to detect the soil pressure outside the pipe section.

[0028] An elastic positioning structure is provided inside the protection box, and the elastic positioning structure is positioned and coordinated with the soil pressure detection element to meet the installation requirements of soil pressure detection elements of different sizes. The length of the lead tube is adjustable to adapt to pipe sections of different sizes. The protection box and the lead tube have better versatility and the installation cost of the monitoring device is lower. A cable is installed in the lead tube, and the cable is electrically connected between the soil pressure detection element and the wireless signal transmitter. The soil pressure electrical signal is converted into a wireless signal through the wireless signal transmitter and the soil pressure wireless signal is sent out, which saves a lot of time and manpower occupied by the traction and layout of the cable of the soil pressure box and realizes the rapid transmission of soil pressure monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional schematic diagram of a soil pressure monitoring device (during pre-buried construction) in a specific embodiment of the soil pressure monitoring device for pipe jacking construction of the present invention;

[0030] Figure 2 It is a cross-sectional schematic diagram of the soil pressure monitoring device (when used for monitoring) in a specific embodiment of the soil pressure monitoring device for pipe jacking construction of the present invention;

[0031] Figure 3 A schematic top view of a protection box and an earth pressure detection element in a specific embodiment of the earth pressure monitoring device for pipe jacking construction of the present invention;

[0032] Figure 4 It is a transverse cross-sectional view of a jacking pipe section in a specific embodiment of the soil pressure monitoring device for jacking pipe construction of the present invention.

[0033] In the figure: 1-protection box, 10-accommodation chamber, 11-sealing cover, 12-cylindrical compression spring, 13-wire outlet hole, 14-positioning plate, 15-quick-setting cement;

[0034] 2 - soil pressure detection element, 3 - lead tube, 30 - cable, 31 - first pipe section, 32 - second pipe section, 33 - sealing plug, 34 - outlet plug, 35 - polyurethane water-swellable waterproof glue;

[0035] 4-wireless signal transmitter, 5-pipe jacking section, 50-monitoring point. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] A specific embodiment 1 of the soil pressure monitoring device for pipe jacking construction of the present invention is as follows: Figures 1 to 4 As shown, the soil pressure monitoring device for pipe jacking construction includes a protection box 1, a soil pressure detection element 2 and a lead tube 3. The protection box 1 is provided with a receiving cavity 10 for accommodating the soil pressure detection element 2, and the interior of the protection box 1 is provided with an elastic positioning structure, which is positioned and matched with the soil pressure detection element 2; a sealing cover 11 is detachably installed on the protection box 1, and the sealing cover 11 is used for installation during pre-buried construction and removal during monitoring use. The protection box 1 is also provided with a wire outlet hole 13, and the lead tube 3 is connected to the wire outlet hole 13, and the lead tube 3 is a length-adjustable tube body; a cable 30 is installed in the lead tube 3, one end of the cable 30 is electrically connected to the soil pressure detection element 2, and the other end of the cable 30 passes through the lead tube 3 and is electrically connected to a wireless signal transmitter 4; the wireless signal transmitter 4 is used to receive the soil pressure electrical signal emitted by the soil pressure detection element 2, and convert the soil pressure electrical signal into a wireless signal to send the soil pressure wireless signal outward.

[0038] The soil pressure monitoring device for pipe jacking construction adopts a structural design of a protection box 1, a soil pressure detection element 2, a lead tube 3 and a wireless signal transmitter 4. During pre-buried construction, the protection box 1 is installed on the outer wall of the pipe jacking section 5, and the sealing cover 11 is first installed on the protection box 1 to seal the accommodating cavity 10 to prevent concrete from entering the protection box 1 and affecting the subsequent installation of the soil pressure detection element 2, thereby avoiding the problem of soil pressure monitoring failure; after the soil pressure monitoring device is installed in place and the pipe jacking section 5 is cast, the sealing cover 11 is removed to open the accommodating cavity 10, and the soil pressure detection element 2 is installed in the protection box 1, so that the soil pressure detection element 2 is directly exposed to the outside to detect the soil pressure outside the pipe section.

[0039] An elastic positioning structure is provided inside the protection box 1, and the elastic positioning structure is positioned and matched with the soil pressure detection element 2 to meet the installation requirements of soil pressure detection elements 2 of different sizes. The length of the lead tube 3 is adjustable to adapt to pipe sections of different sizes. The protection box 1 and the lead tube 3 have better versatility and the installation cost of the monitoring device is lower. A cable 30 is installed in the lead tube 3, and the cable 30 is electrically connected between the soil pressure detection element 2 and the wireless signal transmitter 4. The soil pressure electrical signal is converted into a wireless signal through the wireless signal transmitter 4 and the soil pressure wireless signal is sent out, which saves a lot of time and manpower occupied by the traction and layout of the soil pressure box cable and realizes the rapid transmission of soil pressure monitoring data.

[0040] In this embodiment, a sealing plug 33 or a wire outlet plug 34 is detachably installed at the end of the lead-in tube 3 away from the protection box 1. The sealing plug 33 is used to be installed during pre-buried construction to seal the pipe opening of the lead-in tube 3; the wire outlet plug 34 is used to replace the sealing plug 33 during monitoring use to allow the other end of the cable 30 to be led out. The sealing plug 33 or the wire outlet plug 34 is in sealing cooperation with the inner wall of the lead-in tube 3. The pipe opening of the lead-in tube 3 is blocked by the sealing plug 33 to prevent concrete from entering the lead-in tube 3 and causing blockage during pouring. The perforation of the wire outlet plug 34 is used to achieve the sealed lead-out of the cable 30.

[0041] The protection box 1 includes a box bottom and side walls, the side walls are arranged around the edge of the box bottom to form a receiving cavity 10 of the protection box 1, and the wire outlet hole 13 is arranged on the box bottom of the protection box 1. In addition, the elastic positioning structure includes at least two elastic members, the soil pressure detection element 2 is arranged in the middle of the protection box 1, and at least two elastic members are respectively connected between the soil pressure detection element 2 and the side walls. Specifically, the elastic member is a cylindrical compression spring 12, and four cylindrical compression springs 12 are provided. The four cylindrical compression springs 12 are distributed symmetrically with respect to the soil pressure detection element 2, and a positioning plate 14 is provided at the end of the cylindrical compression spring 12, and the positioning plate 14 is matched with the outer contour of the soil pressure detection element 2 in a concave-convex manner.

[0042] Four cylindrical compression springs 12 are arranged in the protection box 1, and radial top pressure is generated on the soil pressure detection element 2 through the cylindrical compression springs 12, and the positioning plate 14 is matched with the outer contour of the soil pressure detection element 2, which ensures the accurate positioning and installation of the soil pressure detection element 2, and can adapt to soil pressure detection elements 2 of different sizes. The upper edge of the positioning plate 14 is lower than the upper edge of the protection box 1, which prevents the positioning plate 14 from contacting the external soil layer and affecting the accuracy of soil pressure detection, and the sum of the height of the positioning plate 14 and the thickness of the sealing cover 11 is less than the height of the accommodating cavity 10, ensuring that the sealing cover 11 can completely seal the protection box 1 after closing.

[0043] Specifically, the height of the positioning plate 14 is approximately two-thirds of the height of the protection box 1. The inner side surface of the positioning plate 14 is an arc-shaped surface, and an elastic pad is bonded to the arc-shaped surface. The arc-shaped surface of the positioning plate 14 and the circular contour of the soil pressure detection element 2 form a tight fit, and the two have a better match, thereby improving the positioning and installation effect.

[0044] In addition, the lead tube 3 includes at least two tube sections, and two adjacent tube sections are threadedly connected. Specifically, the lead tube 3 includes a first tube section 31 and a second tube section 32, the first tube section 31 is provided with an external thread, the end of the second tube section 32 is provided with an internal thread matching the external thread, and the outlet hole 13 is provided with an internal thread hole matching the external thread. The first tube section 31 is threadedly connected to the outlet hole 13 at the bottom of the protection box 1, and then the second tube section 32 is threadedly connected at the other end of the first tube section 31, and the first tube section 31 and the second tube section 32 are repeatedly connected in sequence according to the thickness of the top pipe section 5, thereby forming a lead tube 3 for protecting the cable 30, ensuring that the cable 30 can be smoothly led out to the inside of the top pipe section 5.

[0045] The installation method of the soil pressure monitoring device for pipe jacking construction includes the following steps:

[0046] Step 1: Before pouring concrete for the jacking pipe segment 5, first determine the position of the monitoring point 50 for installing the earth pressure monitoring device in the steel cage, and adjust the length of the lead tube 3 to match the thickness of the pipe segment at the monitoring point 50; in step 1, adjust the length of the lead tube 3 so that the upper edge of the protection box 1 is flush with the outer wall of the jacking pipe segment 5, and the end of the lead tube 3 away from the protection box 1 is flush with the inner wall of the jacking pipe segment 5.

[0047] Step 2: Fix the earth pressure monitoring device in the steel cage by welding so that the extension direction of the earth pressure monitoring device is arranged along the wall thickness direction of the pipe segment; install the sealing cover 11 on the protection box 1, and install the sealing plug 33 at the end of the lead tube 3 away from the protection box 1, and block the pipe mouth of the lead tube 3 with the sealing plug 33 to prevent concrete from entering the lead tube 3 and causing blockage during pouring.

[0048] Step 3: After the soil pressure monitoring device is fixed, pour concrete.

[0049] Step 4: After the concrete curing is completed, the top pipe section 5 is demoulded, the sealing cover 11 and the sealing plug 33 are removed, the earth pressure detection element 2 is fixed in the accommodating cavity 10, and the cable 30 is passed through the outlet hole 13 and the lead tube 3, and the outlet plug 34 is installed at the end of the lead tube 3 away from the protection box 1;

[0050] After the cable 30 is installed, the polyurethane water-swellable waterproof glue 35 is filled in the lead tube 3, and the quick-setting cement 15 is filled in the gap between the earth pressure detection element 2 and the protection box 1 and inside the outlet hole 13. In addition, the gap between the cable 30 and the hole of the outlet plug 34 is filled with epoxy resin glue to prevent external water from penetrating into the pipe section through multiple caulking designs.

[0051] Step 5. Electrically connect the other end of the cable 30 to the wireless signal transmitter 4. The wireless signal transmitter 4 is equipped with a power supply (not shown in the figure). The wireless signal transmitter 4 and the power supply are installed on the inner wall of the top pipe section 5. The wireless signal transmitter 4 sends out a wireless signal of soil pressure, and the data is received, recorded and read by a computer.

[0052] The specific embodiment of the installation method of the soil pressure monitoring device for pipe jacking construction of the present invention is the same as the specific embodiment of the installation method of the soil pressure monitoring device for pipe jacking construction in the specific implementation mode of the soil pressure monitoring device for pipe jacking construction of the present invention, and will not be repeated here.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A soil pressure monitoring device for pipe jacking construction, characterized in that: It comprises a protection box, an earth pressure detection element and a lead tube, wherein the protection box is provided with a receiving cavity for accommodating the earth pressure detection element, and an elastic positioning structure is provided inside the protection box, and the elastic positioning structure is positioned and matched with the earth pressure detection element; The protection box is provided with a detachable sealing cover, which is used for installation during pre-embedded construction and removal during monitoring. The protection box is also provided with a wire outlet hole, and the lead-in tube is connected to the wire outlet hole. The lead-in tube is a tube body with adjustable length. A cable is inserted into the lead tube, one end of the cable is electrically connected to the soil pressure detection element, and the other end of the cable passes through the lead tube and is electrically connected to a wireless signal transmitter; The wireless signal transmitter is used to receive the earth pressure electrical signal sent by the earth pressure detection element, and convert the earth pressure electrical signal into a wireless signal to send the earth pressure wireless signal outward; The end of the lead-in tube away from the protection box is detachably provided with a sealing plug or a wire outlet plug, wherein the sealing plug is used to be installed during pre-buried construction to seal the lead-in tube; the wire outlet plug is used to replace the sealing plug during monitoring use to allow the other end of the cable to be led out; The lead pipe comprises at least two pipe sections, and two adjacent pipe sections are threadedly connected; The lead-in tube comprises a first tube section and a second tube section, wherein the first tube section is provided with an external thread, the end of the second tube section is provided with an internal thread matching the external thread, and the wire outlet hole is provided with an internal thread hole matching the external thread.

2. The soil pressure monitoring device for pipe jacking construction according to claim 1 is characterized in that: The protection box comprises a box bottom and side walls, the side walls are arranged around the edge of the box bottom to form the accommodating cavity, and the wire outlet hole is arranged on the box bottom.

3. The soil pressure monitoring device for pipe jacking construction according to claim 2 is characterized in that: The elastic positioning structure includes at least two elastic members, the soil pressure detection element is arranged in the middle of the protection box, and at least two of the elastic members are respectively connected between the soil pressure detection element and the side wall.

4. The soil pressure monitoring device for pipe jacking construction according to claim 3 is characterized in that: The elastic member is a cylindrical compression spring, and four cylindrical compression springs are provided. The four cylindrical compression springs are distributed symmetrically about the center of the soil pressure detection element, and a positioning plate is provided at the end of the cylindrical compression spring. The positioning plate is concave-convexly matched with the outer contour of the soil pressure detection element.

5. The soil pressure monitoring device for pipe jacking construction according to claim 4 is characterized in that: The upper edge of the positioning plate is lower than the upper edge of the protection box, and the sum of the height of the positioning plate and the thickness of the sealing cover is less than the height of the accommodating cavity.

6. A method for installing the soil pressure monitoring device for pipe jacking construction as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Before pouring concrete into the pipe section, first determine the monitoring point location for installing the earth pressure monitoring device in the steel cage, and adjust the length of the lead pipe to match the thickness of the pipe section at the monitoring point; Step 2: Fix the earth pressure monitoring device in the steel cage so that the extension direction of the earth pressure monitoring device is arranged along the wall thickness direction of the pipe segment; install a sealing cover on the protection box, and install a sealing plug at the end of the lead pipe away from the protection box; Step 3: After the earth pressure monitoring device is fixed, pour concrete; Step 4: After the concrete curing is completed, the top pipe section is removed from the mold, the sealing cover and the sealing plug are removed, the earth pressure detection element is fixed in the accommodating cavity, and the cable is passed through the outlet hole and the lead pipe, and the outlet plug is installed at the end of the lead pipe away from the protection box; Step 5. Electrically connect the other end of the cable to the wireless signal transmitter. The wireless signal transmitter is equipped with a power supply. Install the wireless signal transmitter and the power supply on the inner wall of the jacking pipe section. The wireless signal transmitter sends out a wireless signal of soil pressure, and the data is received, recorded and read by a computer.

7. The method for installing the soil pressure monitoring device for pipe jacking construction according to claim 6 is characterized in that: In step 1, the length of the lead tube is adjusted so that the upper edge of the protection box is flush with the outer wall of the top pipe section, and the end of the lead tube away from the protection box is flush with the inner wall of the top pipe section; In step 4, after installing the cables, fill the lead-in tube with polyurethane water-swellable waterproofing glue, and fill the gap between the soil pressure detection element and the protection box and the inside of the outlet hole with quick-setting cement.

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