Large-pipe-diameter long-distance pipe jacking retaining construction device in soft soil area

Abstract

The utility model discloses a large-pipe-diameter long-distance pipe jacking retaining construction device in a soft soil area. The large-pipe-diameter long-distance pipe jacking retaining construction device comprises a frame body, a jack, a rail assembly and a pipe jacking machine. A force transmission frame is installed at the position, close to a tunnel portal, of the frame body, and anti-retreating devices are assembled between the force transmission frame and the tail section of the pipe jacking machine and between the force transmission frame and the first pipe joint. Therefore, the pipe jacking device can effectively prevent the pipe jacking machine and the first pipe section from retreating under the action of water and soil pressure when the jack retracts after the pipe jacking machine goes out of a hole, so that the pipe jacking work is safely, efficiently and economically completed, and the pipe jacking construction quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a soft soil area big pipe diameter long distance pipe jacking stop retreat construction device belongs to pipe jacking construction technical field. BACKGROUND

[0002] The pipe jacking machine is used for the pipe jacking construction of the pipe jacking project, and the pipe jacking machine is used for the pipe jacking construction of the pipe jacking project. SUMMARY

[0003] The utility model aims at providing a kind of soft soil area big pipe diameter long distance pipe jacking stop retreat construction device, to effectively avoid pipe jacking machine after just out of hole, pipe jacking machine and pipe section retreat under the action of water and soil pressure when jack retracts, to safely, efficiently, economically complete pipe jacking jacking work, improve pipe jacking construction quality.

[0004] To achieve the above technical purpose, the utility model will adopt the following technical scheme:

[0005] A kind of soft soil area big pipe diameter long distance pipe jacking stop retreat construction device, including frame body, jack, track assembly and pipe jacking machine;The frame body is installed with force transmission frame at the position close to portal, and the force transmission frame is equipped with the device for preventing retreat between pipe jacking machine tail section and first pipe section.

[0006] Preferably, the device for preventing retreat includes stop wing;First pipe section is equipped with the stop wing including three categories, corresponding first to third stop wing;Wherein:

[0007] First pipe section is equipped with first stop wing at top position, second stop wing at middle position, and third stop wing at the position close to track assembly;

[0008] The upper end of the first retreat-preventing wing is welded and fixed with the force transmission frame, and the lower end is welded with the top of the first pipe section; the outer end of the second retreat-preventing wing is welded and fixed with the force transmission frame, and the inner end is welded with the outer wall at the middle position of the first pipe section; the third retreat-preventing wing is welded and fixed on the track assembly, and the upper end of the third retreat-preventing wing is fixed at the position close to the track assembly of the first pipe section, and the main plate surface of the third retreat-preventing wing is parallel to the jacking direction.

[0009] Preferably, the retreat-preventing wings provided on the pipe jacking machine tail section include three types, which are retreat-preventing wing A, retreat-preventing wing B and retreat-preventing wing C.

[0010] The retreat-preventing wing A is provided at the top position of the pipe jacking machine tail section, the retreat-preventing wing B is provided at the middle position, and the retreat-preventing wing C is provided at the position close to the track assembly.

[0011] The upper end of the retreat-preventing wing A is welded and fixed with the force transmission frame, and the lower end is welded with the pipe jacking machine tail section; the outer end of the retreat-preventing wing B is welded and fixed with the force transmission frame, and the inner end is welded with the outer wall at the middle position of the pipe jacking machine; the retreat-preventing wing C is welded and fixed on the track assembly, and the upper end of the retreat-preventing wing C is fixed at the position close to the track assembly of the pipe jacking machine, and the main plate surface of the retreat-preventing wing C is parallel to the jacking direction.

[0012] Preferably, the force transmission frame is connected with the front end wall of the hole portal through a counter-pulling device.

[0013] Preferably, the counter-pulling device includes a plurality of counter-pulling rods; one end of the counter-pulling rod is connected with the front end wall of the hole portal through a pre-buried anchoring structure, and the other end is fixed with the frame body through a connecting structure.

[0014] Preferably, the pre-buried anchoring structure includes an anchor bar, a pre-buried steel plate and an outer connecting rib; the anchor bar is anchored in the wall, one side of the pre-buried steel plate is welded and fixed with the anchor bar, and the other side is welded with the outer connecting rib; the counter-pulling rod is welded and fixed with the outer connecting rib.

[0015] Preferably, the connecting structure includes a connecting plate and a mechanical sleeve; the connecting plate is welded and fixed with the force transmission frame, and a screw hole is provided on the connecting plate; the counter-pulling rod is screwed and fixed through the mechanical sleeve after passing through the screw hole.

[0016] Preferably, the connecting plate is provided with a triangular stiffener around the connecting position with the force transmission frame.

[0017] Preferably, the frame body is divided into a plurality of standard sections according to the highway transportation standard; two adjacent standard sections are connected through a frame connecting plate.

[0018] Preferably, three groups of guide rail connecting plates are arranged on the frame body, corresponding to the first to third guide rail connecting plates, wherein the first guide rail connecting plate is suitable for the third pipe section outer diameter arrangement, the second guide rail connecting plate is suitable for the second pipe section outer diameter arrangement, and the third guide rail connecting plate is suitable for the first pipe section outer diameter arrangement.

[0019] Based on the above technical purposes, compared with the prior art, the utility model has the following advantages:

[0020] The soft soil area large pipe diameter long distance pipe jacking stop retreat construction device, through the force transmission frame is equipped on the frame body, and the force transmission frame and the tail section and the first pipe section between the pipe jacker are all equipped with the retreat prevention device, to effectively avoid the pipe jacker and the pipe section retreat under the action of water and soil pressure when the pipe jacker retracts after just emerging from the hole, thereby safely, efficiently and economically completing the pipe jacking work, and improving the pipe jacking construction quality. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of the soft soil area large pipe diameter long distance pipe jacking stop retreat construction device of the utility model;

[0022] Figure 2 It is the plane arrangement drawing of the soft soil area large pipe diameter long distance pipe jacking stop retreat construction device of the utility model;

[0023] Figure 3 It is the transverse section arrangement drawing of the soft soil area large pipe diameter long distance pipe jacking stop retreat construction device of the utility model;

[0024] Figure 4 It is the structure drawing of the counter pull device;

[0025] Figure 5 It is the three-dimensional drawing of the counter pull device;

[0026] Figure 6 It is the structure drawing of the pipe section arrangement stop retreat device;

[0027] Figure 7 It is the three-dimensional drawing of the stop retreat device (pipe jacker emerges from the hole state);

[0028] Figure 8 It is the three-dimensional drawing of the stop retreat device (lower pipe section state);

[0029] In the figure: 1, pipe jacking machine; I, track assembly; I-1, first track assembly; I-2, second track assembly; 121, frame longitudinal beam; 122, frame cross beam; 123, scissor brace; 124, frame support column; 125, guide rail connecting piece; 123, scissor brace; 126, force transmission frame; 2, front end shaft lining; 3, counter-pulling device; 31, stiffener; 32, connecting plate; 33, outer connecting rib; 34, counter-pulling rod; 35, pre-buried connecting steel plate b; 36, anchor bar; 37, mechanical sleeve; 38, gasket; 4, track; 5, guide rail; 6, rear backrest; 7, jack support; 8, jack; 9, guide rail stop plate; 10, frame connecting plate; 11, first pipe section; 12, main frame; 13, scissor brace; 14, anti-bumping device; 110, inner connecting profile steel; 111, pre-buried steel plate; 115, hoisting hole; 116, stop wing, 1161, first stop wing; 1162, second stop wing; 1163, third stop wing. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Unless otherwise specified, the relative arrangement, expression and numerical value of the components and steps described in these embodiments do not limit the scope of the present application. The technology, method and equipment known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values.

[0031] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used here to describe the spatial positional relationship of a device or feature as shown in the figure to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figure. For example, if the device in the figure is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations).

[0032] The large-diameter, long-distance pipe jacking anti-retreat construction device for soft soil areas described in this utility model, such as Figure 1 As shown, it includes the frame, jacks, track assembly, and pipe jacking machine; among which:

[0033] Pipe jacking machines and pipe sections are typically circular in shape for better compressive strength, but rectangular shapes can be used if the building's functionality is limited. The pipe jacking machine cuts the soil layer with its front cutterhead and transports the soil outside the pit using either mud or slurry removal.

[0034] Since pipe jacking construction is all underground and involves a large amount of equipment, working shafts are used to isolate the pipe jacking machine from the surrounding soil. The working shafts utilize Larssen sheet piles, interlocking steel pipe piles, and caissons as support structures. Plain concrete walls are installed at the pipe jacking exit point to facilitate removal when the pipe jacking machine exits the tunnel.

[0035] The frame is installed in the working shaft, and track assemblies are arranged on the frame along the jacking direction. These assemblies include longitudinal beams and transverse beams. The longitudinal beams are arranged along the jacking direction, and the transverse beams are arranged perpendicular to the jacking direction. There are two sets of track assemblies on the frame, corresponding to the first track assembly and the second track assembly, as shown in the attached diagram. Figure 2 .

[0036] One end of the frame body is provided with a jack support for mounting a jack and ensuring that the jack is in close contact with a rear backrest formed on the rear end wall of the working well, and the other end of the frame body is arranged close to a hole forming position on the front end wall of the working well. The rear backrest is a jack force diffusion component and is usually made of reinforced concrete. The rear backrest transmits the jacking force from the jack to the well wall to prevent local pressure damage to the well wall. The jack support is a jack bearing component, and the number of layers, height and width of the jack support are determined according to the shape and size of the pipe section. In order to avoid instability of the jack support during jacking, a transverse connection can be arranged between the jack supports, and the rear side is in close contact with the main frame body cross beam. The jack is the main output component for pipe jacking, and different numbers and specifications of jacks are matched according to the size of the pipe section, the jacking length and the soil layer condition. The jack is placed on the jack support, and the lateral movement of the jack is limited by triangular steel plates welded on the support, and the rear end of the jack is in close contact with the rear backrest. The stroke of the jack should be greater than 250mm more than the length of the pipe section.

[0037] The track assembly comprises guide rails and tracks arranged on the guide rails by welding, and the guide rails are installed on the frame beam by guide rail connecting plates. The track is an "I" track for heavy cranes. The guide rail adopts a square pipe section with good bending resistance, and is integrally formed by welding with the track. The guide rail connecting plates are arranged at a fixed interval and are bolted to the frame beam arranged on the frame body. The guide rail connecting plate is composed of two triangular steel plates and two trapezoidal steel plates and is welded to the frame beam.

[0038] The frame body is divided into three grades according to different outer diameters of the pipe sections. The outer diameter of the pipe section is 0.9m-1.5m for the first grade, the outer diameter of the pipe section is 1.8m-3.3m for the second grade, and the outer diameter of the pipe section is 3.5m-4.2m for the third grade. In other words, the frame body is provided with three groups of guide rail connecting plates, corresponding to the first to third guide rail connecting plates. Among them, the first guide rail connecting plate is suitable for the third grade pipe section, the second guide rail connecting plate is suitable for the second grade pipe section, and the third guide rail connecting plate is suitable for the first grade pipe section. For details, please refer to the accompanying drawings. Figure 1 、 6 .

[0039] As shown in Figure 3 , the frame body is divided into several standard sections according to the highway transportation standard; adjacent two standard sections are connected through frame connecting plates, and the frame connecting plates usually adopt connecting flanges; the force transmission frame is built in the shape of rectangular square tubes, and scissors are arranged between the rectangular square tubes to enhance the stability of the main frame structure, and the scissors adopt a channel steel section.

[0040] The force transmission frame is installed at a position close to the tunnel portal, and is connected between the force transmission frame and the front-end shaft wall around the tunnel portal through a counter-pulling device, and an anti-head-butting device is assembled on the force transmission frame to elastically contact the tail section of the pipe jacking machine located directly below the anti-head-butting device.

[0041] As shown in Figure 2 , the force transmission frame is in a U shape as a whole; the force transmission frame comprises two vertical support columns and a cross beam; the cross beam is arranged above the track assembly; the two vertical support columns are symmetrically arranged on the two sides of the track assembly in the transverse direction; the lower end of each vertical support column is fixed to the frame body, and the upper end is connected to the cross beam.

[0042] The counter-pulling device is one of the important structures for connecting the frame body and the front-end shaft wall, and mainly functions to resist the water and soil pressure transmitted from the front of the pipe jacking machine, and to provide certain anti-torsion and anti-overturning functions. Figure 4 , Figure 5 As shown in , the counter-pulling device comprises a plurality of counter-pulling rods; one end of the counter-pulling rod is connected to the front-end shaft wall through a pre-buried anchoring structure, and the other end is fixed to the frame body through a connecting structure. The pre-buried anchoring structure comprises an anchor bar, a pre-buried steel plate and an external connecting rib; the anchor bar is anchored in the shaft wall; one side of the pre-buried steel plate is welded and fixed to the anchor bar, and the other side is welded to the external connecting rib; the counter-pulling rod is welded and fixed to the external connecting rib; the connecting structure comprises a connecting plate and a mechanical sleeve; the connecting plate is welded and fixed to the frame body, and a threaded hole is arranged on the connecting plate; the counter-pulling rod is screwed and fixed through the threaded hole and the mechanical sleeve. Triangle stiffening plates are arranged around the connecting plate to avoid local buckling of the connecting plate under the action of the counter-pulling rod.

[0043] In the counter-pulling device, the anchor bar is made of a threaded steel bar, which is constructed together with the shaft wall steel bar during the sinking well construction. Considering that most of the working wells are constructed by the sinking well method, the elevation and plan position error is large, and the anchor bar can also be planted by the post-anchoring method. The pre-buried steel plate is made of a steel plate with a thickness of at least 16 mm, which is welded together with the anchor bar. The external connecting rib is made of a threaded steel bar with the same specification as the counter-pulling rod, which is arranged in a "U" shape, one end of which is welded to the pre-buried steel plate, and the other end is welded to the counter-pulling rod. The purpose of arranging the external connecting rib is to prevent dislocation of the connection between the pre-buried steel plate and the frame body. In order to avoid local buckling of the connecting plate, a pad plate is additionally arranged at the bottom of the mechanical sleeve. In order to avoid local buckling of the connecting plate under the action of the counter-pulling rod, triangle stiffening plates are additionally arranged around the connecting point with the force transmission frame.

[0044] When the pipe jacking machine just exits the tunnel, the negative frictional resistance generated by the pipe jacking machine and the first pipe section and the surrounding soil layer is smaller than the water and soil pressure received by the front end of the pipe jacking machine. When the jack retracts, the pipe jacking machine and the first pipe section will also retreat under the action of the water and soil pressure, resulting in collapse of the soil layer in front of the pipe jacking machine and ground subsidence. The pipe jacking out of the tunnel is an important node of the pipe jacking project, and is also a major risk source.

[0045] In order to increase the safety of the portal chiseling and the pipe jacking machine out of the portal, a cement mixing pile wall is usually arranged within a range of 5m outside the portal. According to the Rankine earth pressure formula, the self-stability of the cement mixing pile wall is far greater than that of the undisturbed soil layer. When the pipe jacking machine just comes out of the portal, it is still in the cement mixing pile wall, and the cutter head of the pipe jacking machine is basically not affected by the water and soil pressure, so the number of the stop wings required is less. When the pipe jacking machine passes through the cement mixing pile wall, the undisturbed water and soil pressure on the cutter head will increase explosively, so the number of the stop wings required is more.

[0046] Specifically, the stop device comprises a stop wing; as Figure 6-8 As shown, the stop wings arranged on the first pipe section include three types, corresponding to the first to third stop wings; the first stop wing is arranged at the top position of the first pipe section, the second stop wing is arranged at the middle position, and the third stop wing is arranged near the track assembly; the upper end of the first stop wing is welded and fixed with the force transmission frame, and the lower end is welded with the top of the first pipe section; the outer end of the second stop wing is welded and fixed with the force transmission frame, and the inner end is welded with the outer side wall at the middle position of the first pipe section; the third stop wing is welded and fixed on the track assembly, and the upper end of the third stop wing is fixed near the track assembly of the first pipe section, and the main plate surface of the third stop wing is parallel to the jacking direction.

[0047] As shown in Figure 7 , Figure 8 The stop wings arranged on the pipe jacking machine include two types, corresponding to the stop wing A, the stop wing B and the stop wing C; the stop wing A is arranged at the top position of the tail section of the pipe jacking machine, the stop wing B is arranged at the middle position, and the stop wing C is arranged near the track assembly. The upper end of the stop wing A is welded and fixed with the force transmission frame, and the lower end is welded with the tail section of the pipe jacking machine; the outer end of the stop wing B is welded and fixed with the force transmission frame, and the inner end is welded with the outer side wall at the middle position of the tail section of the pipe jacking machine; the stop wing C is welded and fixed on the track assembly, and the upper end of the stop wing C is fixed near the track assembly of the pipe jacking machine, and the main plate surface of the stop wing C is parallel to the jacking direction.

Claims

1. A device for preventing retreat during long-distance pipe jacking in soft soil areas, comprising a frame, jacks, a track assembly, and a pipe jacking machine; characterized in that, The frame is equipped with a force transmission frame near the tunnel entrance, and anti-reverse devices are installed between the force transmission frame and the tail section of the pipe jacking machine and the first pipe section. The anti-reverse device includes anti-reverse wings; the anti-reverse wings equipped on the first pipe section include three types, corresponding to the first to third anti-reverse wings; wherein: The first tube section is equipped with a first anti-reverse wing at the top, a second anti-reverse wing at the middle, and a third anti-reverse wing near the track assembly. The upper end of the first anti-reverse wing is welded and fixed to the force transmission frame, and the lower end is welded to the top of the first pipe section; the outer end of the second anti-reverse wing is welded and fixed to the force transmission frame, and the inner end is welded to the outer wall of the first pipe section at the middle position; the third anti-reverse wing is welded and fixed to the track assembly, and the upper end of the third anti-reverse wing is fixed to the position of the first pipe section near the track assembly, while the main plate surface of the third anti-reverse wing is parallel to the jacking direction.

2. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 1, characterized in that, The anti-reverse fins installed at the tail section of the pipe jacking machine include three types, corresponding to anti-reverse fin A, anti-reverse fin B, and anti-reverse fin C, among which: The tail section of the pipe jacking machine is equipped with a backstop wing A at the top, a backstop wing B at the middle, and a backstop wing C near the track assembly. The upper end of the anti-reverse wing A is welded and fixed to the force transmission frame, and the lower end is welded to the tail section of the pipe jacking machine. The outer end of the anti-reverse wing B is welded and fixed to the force transmission frame, and the inner end is welded to the outer wall of the pipe jacking machine at the middle position. The anti-reverse wing C is welded and fixed to the track assembly, and the upper end of the anti-reverse wing C is fixed to the position of the pipe jacking machine near the track assembly. At the same time, the main plate surface of the anti-reverse wing C is parallel to the jacking direction.

3. The anti-retreat device for large-diameter, long-distance pipe jacking construction in soft soil areas according to claim 2, characterized in that, The force transmission frame is connected to the front wall of the tunnel entrance via a reverse tensioning device.

4. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 3, characterized in that, The aforementioned anti-pull device includes several anti-pull rods; one end of the anti-pull rod is connected to the front well wall through a pre-embedded anchoring structure, and the other end is fixed to the frame through a connecting structure.

5. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 4, characterized in that, The pre-embedded anchoring structure includes anchor bars, pre-embedded steel plates, and external connecting bars; the anchor bars are anchored in the well wall, one side of the pre-embedded steel plate is welded to the anchor bars, and the other side is welded to the external connecting bars; the tie rod is welded to the external connecting bars.

6. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 4, characterized in that, The connection structure includes a connecting plate and a mechanical sleeve; the connecting plate is welded and fixed to the force transmission frame, and the connecting plate is provided with screw holes. The counter-pull rod passes through the screw holes and is tightened and fixed by the mechanical sleeve.

7. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 6, characterized in that, The connecting plate is reinforced with triangular stiffening plates around the connection point with the force transmission frame.

8. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 1, characterized in that, The frame is divided into several standard segments according to highway transportation standards; adjacent standard segments are connected by frame connecting plates.

9. The anti-retreat device for large-diameter long-distance pipe jacking construction in soft soil areas according to claim 8, characterized in that, The frame is equipped with three sets of guide rail connecting plates, corresponding to the first to the third guide rail connecting plates. The first guide rail connecting plate is suitable for the outer diameter of the third section of the pipe, the second guide rail connecting plate is suitable for the outer diameter of the second section of the pipe, and the third guide rail connecting plate is suitable for the outer diameter of the first section of the pipe.

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