Pipe jacking construction shaft hole grouting structure and use method thereof

Abstract

The application discloses a kind of vertical shaft hole grouting structure of pipe jacking construction, and the hole formed between the hole pressed out when the machine head of pipe jacking advances and pipe section of pipe jacking forms annular space;Ground is provided with grouting pump outside vertical shaft, and the outlet of grouting pump is connected with grouting hose;Annular space is provided with soil reinforcement zone around annular space in rear portion of annular space;The front end of soil well wall area is embedded with annular pipe around annular space, and the annular pipe is provided with grout outlet, and grout outlet is communicated with annular space;Annular pipe is connected with grouting interface by connecting pipe, and grouting interface is fixed on vertical shaft wall and is connected with grouting hose, and hole annular sealing device is arranged around annular space at hole.The application is provided with soil reinforcement zone, to avoid the problem that soil collapses due to the continuous excessive pressure at grouting port, to avoid the problem that grout membrane is insufficient in rear section of annular space, and pipe section and soil friction increases, to reduce the energy consumption of vertical shaft inside pressing device, so that the same pressing device can press in pipe jacking longer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe jacking construction, in particular to the grouting technology in pipe jacking construction. BACKGROUND

[0002] In the present application, the jacking direction of the pipe is the forward direction.

[0003] The basic structure of pipe jacking construction is that the front end of the pipe segment 1 is connected to and jacked against the machine head, and the machine head is provided with a rotatable cutter head. During pipe jacking construction, the cutter head and the machine head are placed in the opening in the jacking direction (generally horizontal direction) in the shaft, the jacking equipment in the shaft jacks the machine head into the soil, and then the subsequent pipe segment 1 is hoisted into the shaft, and the jacking equipment in the shaft jacks the pipe segment 1 forward, after the previous pipe segment 1 is jacked into place, the jacking equipment is retracted, and the next pipe segment 1 is hoisted into the shaft. The pipe segment 1 is continuously jacked forward to carry out pipe jacking construction.

[0004] As shown in Figure 1 During pipe jacking construction, the diameter of the machine head is larger than that of the pipe segment 11 (the pipe segment 11 of the pipe), for example, 4 cm larger, and when the machine head is jacked, a hole 2 with the same size as the diameter of the machine head is formed, and an annular space 6 (2 cm) is formed between the inner wall of the hole 2 and the outer wall of the pipe segment 11.

[0005] If the annular space 6 is not filled, the surrounding soil will be squeezed onto the pipe under the action of soil stress (active earth pressure), greatly increasing the soil friction during the jacking of the pipe (the pipe segments 11 of the pipe), greatly increasing the energy consumption of the jacking equipment during pipe jacking construction, and shortening the distance that the jacking equipment can jacking.

[0006] The maximum jacking force of the jacking equipment is fixed, and the friction between the pipe segment 11 of the pipe and the surrounding soil or slurry increases continuously as the jacking distance increases, i.e., as the pipe segment 11 lengthens, when the friction reaches the maximum jacking force of the jacking equipment, the pipe segment 11 (of the pipe) cannot be jacked forward any more.

[0007] Therefore, it is necessary to grout and lubricate the above-mentioned annular space 6 to reduce the energy consumption of the jacking equipment per unit jacking distance and extend the maximum distance that the jacking equipment can jacking.

[0008] To grout and lubricate the above-mentioned annular space 6, the prior art is to grout into the annular space at the machine head, and as the number of pipe segments 1 increases and the pipe lengthens, the length of the annular space 6 also increases. The pressure in the annular space 6 near the machine head is high, and the pressure in the annular space 6 far from the machine head is low (the soil friction that needs to be overcome when the pipe segment 1 advances is large due to insufficient slurry film), so it is necessary to supplement the slurry in the annular space 6 far from the machine head.

[0009] Supplementing slurry cannot replace grouting, and grouting solves the problem of filling slurry in the annular space to form a predetermined pressure when there is no slurry in the annular space; the problem that supplementing slurry aims to solve is that, in the process of pipe jacking construction, the slurry pressure in the annular space of the pipe joint 1 gradually decreases due to diffusion into the soil and other reasons as time goes by and the pipe jacking advances; that is, the problem that supplementing slurry aims to solve is not filling slurry to form a predetermined pressure when there is no slurry, but maintaining the slurry pressure after there is slurry, and the supplementing slurry amount is far less than the grouting amount, and the supplementing slurry equipment cannot support the slurry amount required by grouting.

[0010] Therefore, it is necessary to develop a technology of also grouting at the rear end of the annular space, i.e., the shaft, to avoid the problem that the slurry amount at the rear end of the annular space cannot be guaranteed as the pipe joint 1 of the pipe jacking becomes longer and the distance between the rear end of the annular space and the machine head becomes farther.

[0011] When grouting at the rear end of the annular space, i.e., the shaft, the inventor encountered a problem in the test, that is, the rear end of the annular space 6 (the shaft wall adjacent to the shaft) is prone to collapse and blockage when encountering slurry with pressure, and the shaft wall is prone to collapse and block the grouting passage when grouting at this position. At the same time, hole sealing is also a problem, and if the sealing is not in place, the slurry is easy to enter the shaft, affecting normal work.

[0012] The purpose of the present application is to solve the above technical problems on the basis of grouting near the original machine head, and to provide a shaft hole grouting structure to solve the problem of insufficient slurry amount at the rear of the annular space caused by the original grouting near the machine head. SUMMARY

[0013] The purpose of the present application is to provide a pipe jacking construction shaft hole grouting structure, and to provide a pipe jacking construction shaft hole grouting structure, which avoids the problem of insufficient grouting amount in the rear of the annular space by grouting at the rear end of the annular space.

[0014] To achieve the above-mentioned purpose, the pipe jacking construction shaft hole grouting structure of the present application comprises a pipe jacking extending into the soil from the shaft wall of the shaft, the pipe jacking is assembled by a plurality of pipe joints, the front end of the pipe jacking is provided with a machine head, the diameter of the machine head is greater than that of the pipe joint, and a hole formed by the machine head when advancing is surrounded by the pipe joint to form an annular space; a grouting pump is arranged on the ground outside the shaft, a slurry stirring device is connected to the inlet of the grouting pump, and an opening on the shaft wall of the shaft at the site where the machine head enters the soil is referred to as a hole;

[0015] A soil reinforcement area is arranged around the annular space by grouting, and the soil reinforcement area is located 50-100 cm in front of the hole;

[0016] The soil body behind the soil body reinforcement area is referred to as a soil body shaft wall area; a ring-shaped pipe is embedded around the annular space at the front end of the soil body shaft wall area, the ring-shaped pipe is provided with a grout outlet, the grout outlet communicates with the annular space; the ring-shaped pipe is connected with a grouting interface through a connecting pipe, the grouting interface is fixed on the shaft wall and connected with a grouting hose, and a grouting pump is arranged on the ground and the inlet thereof is connected with a grout stirring device;

[0017] A hole opening annular sealing device is arranged around the annular space at the hole opening, and the hole opening annular sealing device is a rubber ring or a ring-shaped steel plate water stop belt.

[0018] The grout outlet is uniformly provided with a plurality of grout outlets along the circumference of the ring-shaped pipe.

[0019] A second annular sealing device is arranged in the annular space, and the second annular sealing device is a rubber ring or a ring-shaped steel plate water stop belt; the second annular sealing device corresponds to the middle position of the soil body shaft wall area in the front-rear direction and is located behind the ring-shaped pipe.

[0020] An electronic flowmeter and a pressure sensor are arranged at the grouting interface, an electric control device connected with the grouting pump is arranged on the ground or in the shaft, the electric control device is connected with the electronic flowmeter and the pressure sensor, and the electric control device is connected with a display screen and a 5G module;

[0021] A plurality of grouting interfaces are uniformly arranged around the hole opening, and each grouting interface is communicated with the ring-shaped pipe through a connecting pipe; the number of grouting interfaces is one third to one half of the number of grout outlets.

[0022] The application also provides a use method of the pipe jacking construction shaft hole grouting structure,

[0023] First, during pipe jacking construction, the grouting hose is connected with the grouting interface, and the grout is stirred;

[0024] Second, as the pipe section is pushed forward by pressure, the grouting pump is started, and the grout is continuously injected into the annular space through the plurality of grout outlets uniformly distributed on the ring-shaped pipe;

[0025] The second annular sealing device blocks the flow of grout backward; when the second annular sealing device cannot completely block the grout, the amount of grout passing through the second annular sealing device backward is small and the pressure is low, so the grout is completely blocked by the hole opening annular sealing device;

[0026] Third, the staff continuously monitors the grouting pressure and flow through the display screen or the mobile phone, and correspondingly adjusts the working state of the grouting pump through the electric control device until the pipe jacking construction is temporarily stopped or ended;

[0027] When the pipe jacking construction is temporarily stopped or ended, the grouting hose is removed from the grouting interface.

[0028] The electric control device is connected with an audible and light alarm and is internally provided with a pressure alarm threshold, when the grouting pressure is too high or too low, the electric control device sends an alarm information to the mobile phone number reserved by the staff through a 5G module, and simultaneously sends out an audible and light alarm, reminding the on-site and remote staff to timely check and handle.

[0029] The present application has the following advantages:

[0030] The present application sets a soil reinforcement area, avoids soil collapse caused by excessive pressure at the grouting port, thereby avoiding blockage, solves the main problem that the front-end grouting technology cannot be applied to the rear-end grouting, avoids the problems of insufficient grouting membrane in the rear section of the annular space and increased friction between the pipe section 1 and the soil, reduces the energy consumption of the jacking device of the pipe section 1 in the shaft for jacking the pipe, and enables the same jacking device to jacking the pipe for a longer distance (because the soil friction of a single pipe section 1 is reduced, a longer friction between the pipe and the soil is required to match the maximum jacking pressure of the jacking device).

[0031] The hole annular sealing device prevents the grout from flowing backward into the shaft. The grouting interface, as a connecting structure between the soil-in structure and the soil-out structure, can be continuously connected with the soil structure (annular pipe and connecting pipe) and can be easily connected or separated with the pipe-out structure (grouting hose).

[0032] The multiple grouting outlets can uniformly grout the annular space, making the grouting membrane more uniform in all directions in the annular space, and further reducing the friction between the pipe section 1 and the soil when advancing.

[0033] The second annular sealing device and the hole annular sealing device form two seals, better preventing the grout from entering the shaft under pressure.

[0034] The staff on the ground or in the shaft can conveniently monitor the grouting pressure and grouting volume through the display screen and adjust the working state of the grouting pump accordingly.

[0035] The number of grouting interfaces does not need to be the same as the number of grouting outlets, even if it is only half to one-third of the number of grouting outlets, it can provide relatively uniform grouting pressure for each grouting outlet. A relatively small number facilitates manufacturing and installation. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural diagram of the annular space 6 between the pipe section 11 and the hole 2;

[0037] Figure 2 is a structural diagram of the present application; Figure 2 In order to simplify the drawing, the grouting pump and the grout stirring device are drawn on the ground in the jacking direction of the shaft, and in actual use, the placement position of the ground equipment can avoid the ground in the jacking direction.

[0038] Figure 3 This is a schematic diagram of the front surface of the annular tube.

[0039] Figure 4 This is a schematic diagram of the rear surface of the annular tube.

[0040] Figure 5 yes Figure 2 Enlarged view of point A in the middle.

[0041] Figure 6 This is a schematic diagram of the structure of the present invention after the pipe has been pushed forward a certain distance and the ground equipment has been removed.

[0042] Figure 2 The annular pipe is shown to be located at the front end of pipe section 1 because... Figure 2 In the middle stage, the jacking pipe has just been placed and has not yet been pushed forward a great distance; after the machine head and the jacking pipe have advanced a certain distance, the annular space extends forward. Figure 2 The annular pipe is located at the rear of the jacking pipe, that is, at the rear of the annular space.

[0043] The attached diagram is a structural schematic diagram used to clearly illustrate the structure and principle of the present invention, and is not drawn to scale. Detailed Implementation

[0044] like Figures 1 to 6 As shown, the grouting structure for the shaft opening of the pipe jacking construction of the present invention includes a jacking pipe extending into the soil from the shaft wall 4 (in a basically horizontal direction). A jacking device for advancing the jacking pipe is provided inside the shaft. The present invention uses the jacking direction of the jacking pipe as the forward direction. The jacking pipe is assembled from several pipe sections 1. A machine head 5 is installed at the front end of the jacking pipe. A cutter head 5 is installed at the front end of the machine head 5 for rotating and cutting the soil and breaking up hard objects such as rocks in the soil. The cutter head is of conventional technology and is not shown in the figure. The diameter of the machine head 5 is larger than that of the pipe section 1. When the machine head 5 advances, the hole it creates forms an annular space 6 between it and the pipe section 1. A grouting pump 7 is installed on the ground outside the shaft. The inlet of the grouting pump 7 is connected to a slurry mixing device, and the outlet of the grouting pump 7 is connected to a grouting hose 8. The opening on the shaft wall 4 at the point where the machine head 5 enters the soil is called the opening.

[0045] The diameter of the head 5 is larger than that of the pipe section 1 of the jacking pipe. When the head 5 is jacked in, it forms a hole of the same size as its diameter. An annular space 6 is formed between the inner wall of the hole and the outer wall of the pipe section 1.

[0046] The rear part of the annular space 6 is surrounded by a soil reinforcement zone 9 through grouting (after the grout solidifies, a soil reinforcement zone 9 is formed in the grouting area). The soil reinforcement zone 9 is located 50-100 cm in front of the opening (including both ends).

[0047] The soil body behind the soil body reinforcing area 9 (between the shaft wall of the shaft) is referred to as a soil body shaft wall area 10; a ring-shaped pipe 11 is embedded in front of the soil body shaft wall area 10 around the annular space 6, the ring-shaped pipe 11 is provided with a grout outlet 12 facing the annular space 6, the grout outlet 12 is connected to the annular space 6; the ring-shaped pipe 11 is connected to a grouting interface 14 through a connecting pipe 13, the grouting interface 14 is fixed on the shaft wall 4 and connected to the grouting hose 8, the grouting pump 7 is arranged on the ground and its inlet is connected to a grout stirring device 17 (such as a stirring tank, after the grout is stirred, the grouting pump 7 is started to grout).

[0048] A hole annular sealing device 15 is arranged around the annular space 6 at the hole, and the hole annular sealing device 15 is a rubber ring or a ring-shaped steel plate water stop belt.

[0049] The diameter of the grouting interface 14 is 3 cm. The diameter of each grout outlet 12 is 0.5-1 cm, including both end values.

[0050] The pressure of the grout is relatively high when the grout enters the annular space 6, and the pressure will decrease after the grout diffuses in the annular space 6. The single-side dimension of the annular space 6 in the radial direction of the pipe section 1 is 2 cm.

[0051] The rear-end grouting is different from the front-end grouting. In the front-end grouting, since the machine head 5 continuously advances in the pipe jacking construction, the position of the front-end grouting relative to the soil body is not fixed but continuously moves forward, so there is no situation that a part of the soil body continuously bears a relatively high grouting pressure, and thus the soil body reinforcing area 9 is not needed. However, in the rear-end grouting, since the grouting position is constant relative to the soil body, the soil body at the grouting position in the grouting direction (towards the front) continuously bears a relatively high grouting pressure, which is easy to cause the soil body to collapse.

[0052] The present application sets the soil body reinforcing area 9 to avoid the soil body collapse caused by the continuously excessive pressure at the grouting outlet, thereby avoiding the blockage, and solves the main problem that the technology of the front-end grouting cannot be applied to the rear-end grouting.

[0053] The hole annular sealing device 15 is arranged to prevent the grout from flowing backward into the shaft. The grouting interface 14 is a connecting structure between the soil-in structure and the soil-out structure, which can be continuously connected to the soil body structure (the ring-shaped pipe 11 and the connecting pipe 13) and can be conveniently connected to or separated from the pipe-out structure (the grouting hose 8).

[0054] The grout outlets 12 are uniformly arranged along the circumference of the ring-shaped pipe 11. The multiple grout outlets 12 can uniformly grout the annular space 6, so that the grout film at each position in the circumference of the annular space 6 is more uniform, and thus the friction between the pipe section 1 and the soil body when the pipe section 1 advances is lower.

[0055] A second annular sealing device 16 is arranged in the annular space 6, which is a rubber ring or an annular steel plate water stop; the second annular sealing device 16 corresponds to the middle position of the soil wall area 10 in the front-rear direction and is located behind the annular pipe 11.

[0056] The second annular sealing device 16 and the hole annular sealing device 15 form two seals, which better prevent the slurry from entering the shaft under the action of pressure.

[0057] An electronic flow meter and a pressure sensor are arranged at the grouting interface 14, and an electric control device 18 connected with the grouting pump 7 is arranged on the ground or in the shaft, the electric control device 18 is connected with the electronic flow meter and the pressure sensor, and the electric control device 18 is connected with a display screen and a 5G module. The display screen displays the detection information of the electronic flow meter and the pressure sensor during work. The electric control device 18 can be an integrated circuit or a single-chip microcomputer. The 5G module, the display screen, the electronic flow meter and the pressure sensor are all conventional technologies, which are not shown in the figure. The slurry stirring device 17 can be independently controlled by the worker or connected with the electric control device 18 to be controlled by the electric control device 18.

[0058] The electric control device 18 can remotely send signals to the worker through the 5G module, and the worker can remotely monitor and control the pipe jacking construction shaft hole grouting structure through the mobile phone, which is very convenient to use.

[0059] The electric control device is connected with an audible and visual alarm and has a built-in pressure alarm threshold. When the grouting pressure is too high or too low, the electric control device sends an alarm message to the mobile phone number reserved by the worker through the 5G module, and at the same time, the audible and visual alarm is sent to remind the on-site and remote workers to check and handle in time.

[0060] The worker on the ground or in the shaft can conveniently monitor the grouting pressure and the grouting amount through the display screen, and adjust the working state of the grouting pump 7 accordingly.

[0061] 14 A plurality of grouting interfaces 14 are evenly arranged around the hole, and each grouting interface 14 is communicated with the annular pipe 11 through a connecting pipe 13; the number of grouting interfaces 14 is one-third to one-half (including both end values) of the number of slurry outlets 12.

[0062] Figure 4 The interface shown by reference numeral 19 is the interface where the connecting pipe 13 connects with the annular pipe 11, and the diameter is 3 cm. The number of grouting interfaces 14 does not need to be the same as the number of slurry outlets 12, even if it is only one-half to one-third of the number of slurry outlets 12, it can also provide relatively uniform grouting pressure for each slurry outlet 12.

[0063] The first is to connect the grouting hose 8 with the grouting interface 14 during pipe jacking construction, and to stir the slurry well;

[0064] Second, as the pipe section 1 is pushed forward, the grouting pump 7 is started, and slurry is continuously injected into the annular space 6 through the multiple slurry outlets 12 evenly distributed on the annular pipe 11.

[0065] The second annular sealing device 16 blocks the backward flow of slurry; when the second annular sealing device 16 cannot completely block the slurry, the amount of slurry that passes backward through the second annular sealing device 16 is small, and the pressure is low, so it is easily completely blocked by the hole annular sealing device 15, and the slurry cannot enter the shaft, ensuring the normal operation of the equipment in the shaft and protecting the working environment in the shaft.

[0066] Third, the staff can conveniently and continuously monitor the grouting pressure and flow through the display screen, and correspondingly adjust the working state (start, stop, and working frequency) of the grouting pump 7 through the electric control device 18 until the pipe jacking construction is temporarily suspended or completed.

[0067] When the pipe jacking construction is temporarily suspended, the grouting hose 8 can be removed at the grouting interface 14 as needed.

[0068] The above examples are only used to illustrate and not to limit the technical solutions of the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the present application can still be modified or equivalently replaced without departing from the spirit and scope of the present application, and any modification or partial replacement should be covered in the scope of the claims of the present application.

Claims

1. A pipe jacking construction shaft hole grouting structure, comprising a pipe jacking extending into the soil from the shaft wall, the pipe jacking being assembled from a plurality of pipe sections, a machine head being mounted at the front end of the pipe jacking, the diameter of the machine head being greater than that of the pipe sections, an annular space being formed between the hole pressed by the machine head and the pipe sections when the machine head advances, a grouting pump being provided on the ground outside the shaft, a slurry stirring device being connected to the inlet of the grouting pump, a grouting hose being connected to the outlet of the grouting pump, and an opening in the shaft wall at the site where the machine head enters the soil being referred to as a hole; characterized in that: a soil reinforcement zone is provided in the rear part of the annular space by grouting, the soil reinforcement zone being located 50-100 cm in front of the hole; the soil behind the soil reinforcement zone is referred to as a soil shaft wall zone; a ring-shaped pipe is embedded around the annular space at the front end of the soil shaft wall zone, the ring-shaped pipe being provided with a slurry outlet, the slurry outlet being in communication with the annular space; the ring-shaped pipe is connected to a grouting port through a connecting pipe, the grouting port being fixed to the shaft wall and connected to the grouting hose, the grouting pump being provided on the ground and having its inlet connected to the slurry stirring device; a hole annular sealing device is provided around the annular space at the hole, the hole annular sealing device being a rubber ring or a ring-shaped steel plate water stop; a plurality of slurry outlets are uniformly provided along the circumference of the ring-shaped pipe; a second annular sealing device is provided in the annular space, the second annular sealing device being a rubber ring or a ring-shaped steel plate water stop; the second annular sealing device is located at the rear of the ring-shaped pipe and corresponds to the middle position of the soil shaft wall zone in the front-rear direction.

2. The pipe jacking construction shaft hole grouting structure according to claim 1, characterized in that: An electronic flowmeter and a pressure sensor are provided at the grouting port, an electric control device connected to the grouting pump is provided on the ground or in the shaft, the electric control device is connected to the electronic flowmeter and the pressure sensor, the electric control device is connected to a display screen and a 5G module.

3. The pipe jacking construction shaft hole grouting structure according to claim 2, characterized in that: A plurality of grouting ports are uniformly provided around the hole, each grouting port being in communication with the ring-shaped pipe through a connecting pipe; the number of grouting ports is one-third to one-half of the number of slurry outlets.

4. A method for using the pipe jacking construction shaft hole grouting structure according to claim 2, characterized in that: first, during pipe jacking construction, the grouting hose is connected to the grouting port, and the slurry is stirred; second, as the pipe sections advance forward by being pressed, the grouting pump is started, and the slurry is continuously injected into the annular space through the plurality of slurry outlets uniformly distributed on the ring-shaped pipe; the second annular sealing device blocks the flow of slurry backward; when the second annular sealing device cannot completely block the flow of slurry, the amount of slurry that flows backward over the second annular sealing device is small and the pressure is low, so it is completely blocked by the hole annular sealing device; third, the workers continuously monitor the grouting pressure and flow rate through the display screen or mobile phone, and correspondingly adjust the working state of the grouting pump through the electric control device until the pipe jacking construction is temporarily suspended or completed; when the pipe jacking construction is temporarily suspended or completed, the grouting hose is removed at the grouting port.

5. The method of use of claim 4, wherein: The electric control device is connected to an audible and visual alarm and has a built-in pressure alarm threshold; when the grouting pressure is too high or too low, the electric control device sends an alarm message to the mobile phone number reserved by the workers through the 5G module, and simultaneously sends out an audible and visual alarm to remind the workers on site and remotely to check and handle in a timely manner.

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