Rectangular pipe jacking receiving platform

Abstract

The present invention relates to the field of subway infrastructure, and in particular to a rectangular jacking pipe receiving platform, comprising a receiving channel arranged on the side wall of a jacking machine receiving well, a protection module is arranged at the end of the receiving channel, the protection module comprises a waterproof module and an anti-collapse module, a jacking machine support frame is also arranged in the jacking machine receiving well, an operation well is arranged at the bottom of the jacking machine receiving well corresponding to the receiving channel, a water slurry layer is arranged at the lower end of the operation well, an operation layer is arranged at the upper end of the operation well, a support platform is arranged at the upper end of the operation layer, and a jacking machine support frame is arranged at the upper end of the support platform, the jacking machine is protected during the penetration process by the protection module to prevent water gushing and collapse, an operation well is arranged, a water slurry layer is arranged in the operation well, the water slurry in the operation well falls into the water slurry layer, the jacking machine support frame is ensured to be clean, and when the protection module is constructed, the operation space can also be expanded.

Description

Technical Field

[0001] The invention relates to the field of subway infrastructure, and in particular to a receiving platform for a receiving end of a pipe jacking machine. Background Art

[0002] Pipe jacking is currently the main means of excavation for rail transit. The basic working principle of pipe jacking is that a steel component is pushed forward along the axis of the tunnel while excavating the soil. The shell of the cylindrical component is the shield, which plays a temporary support role for the excavated tunnel section that has not yet been lined, bearing the pressure of the surrounding soil layers, and sometimes also bearing the groundwater pressure and keeping the groundwater out. Excavation, soil discharge, lining and other operations are carried out under the cover of the shield. Pipe jacking includes circular pipe jacking and rectangular pipe jacking, which are selected according to project requirements. For example, the Langyuan Station Pipe Jacking Project of the northern section of Tianjin Metro Line 4 is a rectangular pipe jacking.

[0003] During the pipe jacking construction process, the pipe jacking machine is launched from the sending platform, passes through the soil layer of the excavation section, enters the receiving platform, and then is demolished. Due to the different geological environments in different places and the different design dimensions in different regions, each project needs to design the pipe jacking dimensions separately, and then the corresponding sending and receiving platform structures are different. The existing receiving platform mainly includes a receiving channel arranged on the side wall of the pipe jacking receiving well. Since the pipe jacking machine is prone to water gushing and collapse at the sending end and the receiving end, a protection module is arranged at the end of the receiving channel, and the protection module includes a waterproof module and an anti-collapse module. Among them, the waterproof module mainly includes a stirring reinforcement layer constructed at the end of the receiving channel, and the bearing is reduced by a precipitation well. The water head is pressurized to avoid water gushing and collapse. The anti-collapse module includes a protective net installed on the inner lining of the pipe jacking machine receiving well, and a steel ring is installed outside the protective net. A pipe jacking machine support frame is also provided in the pipe jacking machine receiving well. The pipe jacking machine support frame is generally installed at the bottom of the receiving well and fixed to the foundation by ground bolts. The pipe jacking machine receiving well is usually open to the air, thereby providing a channel for lifting and disassembly. Water is easily accumulated in the pipe jacking machine receiving well, and during the penetration of the pipe jacking machine, broken soil accumulates at the inlet end of the pipe jacking machine support frame and needs to be cleaned. When mixed with water, cleaning is difficult. After the pipe jacking machine is moved to the pipe jacking machine support frame, it is dismantled from the upper end during dismantling. Broken soil will also be discharged during the dismantling process, making cleaning difficult. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a rectangular pipe jacking receiving platform which provides space for construction and cleaning and can provide a stable receiving frame for a pipe jacking machine.

[0005] The present invention is achieved through the following technical solutions: a rectangular pipe jacking receiving platform, including a receiving channel arranged on the side wall of a pipe jacking machine receiving well, a protection module is arranged at the end of the receiving channel, the protection module includes a waterproof module and an anti-collapse module, a pipe jacking machine support frame is also arranged in the pipe jacking machine receiving well, an operation well is arranged at the bottom of the pipe jacking machine receiving well corresponding to the receiving channel, a water slurry layer is arranged at the lower end of the operation well, an operation layer is arranged at the upper end of the operation well, a support platform is arranged at the upper end of the operation layer, and a pipe jacking machine support frame is arranged at the upper end of the support platform.

[0006] Furthermore, the water slurry layer includes a raft plate 1 arranged at the bottom of the operating well, a raft plate 2 is arranged above the raft plate 1, a support frame 1 is arranged between the raft plates 1 and 2, and a water slurry layer is formed between the raft plates 1 and 2.

[0007] Furthermore, a second support frame is arranged above the second raft, and a supporting platform is arranged at the upper end of the second support frame.

[0008] Furthermore, a backfill soil channel is provided in the middle of the second raft.

[0009] Furthermore, the support platform includes a raft plate three, and the lower end of the pipe jacking machine support frame is connected to the raft plate three.

[0010] Furthermore, the support platform includes a cross beam, longitudinal beams are arranged on both sides of the upper end of the cross beam, and the pipe jacking machine support frame is connected to the longitudinal beams.

[0011] Furthermore, the pipe jacking machine support frame includes a connecting seat, an upward supporting column is arranged on the connecting seat, and a supporting beam for supporting the pipe jacking machine is arranged at the upper end of the supporting column.

[0012] Furthermore, a receiving groove opening upward is arranged on the working surface of the supporting beam.

[0013] Furthermore, a water-blocking layer is provided on the side wall of the operating well.

[0014] The beneficial effects of the present invention are as follows: the rectangular pipe jacking receiving platform comprises a receiving channel arranged on the side wall of the receiving well of the pipe jacking machine, a protection module is arranged at the end of the receiving channel, the protection module comprises a waterproof module and an anti-collapse module, a pipe jacking machine support frame is also arranged in the receiving well of the pipe jacking machine, an operation well is arranged at the bottom of the receiving well of the pipe jacking machine corresponding to the receiving channel, a water slurry layer is arranged at the lower end of the operation well, an operation layer is arranged at the upper end of the operation well, a support platform is arranged at the upper end of the operation layer, and a pipe jacking machine is arranged at the upper end of the support platform The support frame protects the pipe jacking machine during its penetration through the protection module to prevent water gushing and collapse. An operation well is set up, and a water slurry layer is set up in the operation well. The water slurry in the operation well falls into the water slurry layer to ensure that the pipe jacking machine support frame is clean. When constructing the protection module, the operation space can also be expanded. A dewatering well can be dug at the bottom of the operation well to obtain water. At the same time, the pressurized water head can be controlled. An operation layer and a support platform are set up. The operation layer is used for the construction of a protective net and a steel ring. After the pipe jacking machine is received, the operation well is backfilled to reduce the discharge of construction waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view schematic diagram of Example 1;

[0016] Figure 2 This is a front view schematic diagram of Embodiment 1;

[0017] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0018] Figure 4 This is a structural schematic diagram of Example 1;

[0019] Figure 5 This is a schematic diagram of the structure of the pipe jacking machine support frame in Example 1;

[0020] Figure 6 It is a top view of the support beam;

[0021] Figure 7 This is a schematic diagram of the main view of the support beam;

[0022] Figure 8 This is a schematic diagram of the connection relationship between the raft plate 3 and the pipe jacking machine support frame of Example 1;

[0023] Fig. 9 This is a schematic top view of the support platform of Example 2;

[0024] Fig.10 This is a schematic diagram of the connection relationship between the longitudinal beam and the pipe jacking machine support frame of Example 2;

[0025] Fig.11 This is a schematic diagram of the connection relationship between the longitudinal beam and the pipe jacking machine support frame of Example 3;

[0026] Fig.12 This is a schematic diagram of the prefabricated structure of Example 3.

[0027] Among them: 1-weak reinforcement layer, 2-jacking channel, 3-mixing reinforcement layer, 4-jet grouting pile reinforcement, 5-inner wall of receiving well, 6-concrete reinforcement ring, 7-jacking machine support frame, 8-jacking machine receiving well, 9-dewatering well, 10-raft 1, 11-support frame 1, 12-raft 2, 13-backfill soil channel, 14-support frame 2, 15-raft 3, 16-compacted soil layer, 17-steel ring, 18-water blocking layer, 19-support beam, 20-supplementary grouting, 21-connecting seat, 22-support column, 23-support beam, 24-rib plate, 25-anchor rod, 26-ground bolt, 27-cross beam, 28-longitudinal beam, 29-adjustment wedge, 30-stud, 31-positioning plate, 32-positioning column, 33-tension plate, 34-diagonal brace, 35-receiving groove, 36-hardened foundation. DETAILED DESCRIPTION

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0030] Example 1

[0031] like Figure 1-8As shown, a rectangular pipe jacking receiving platform comprises a receiving channel constructed on the side wall of the receiving well of the pipe jacking machine, a protection module is constructed at the end of the receiving channel, the protection module comprises a waterproof module and an anti-collapse module, specifically, a dewatering well is excavated near the end of the receiving channel, the pressure water head is controlled, the plain soil near the end of the receiving channel is vibrated to obtain a weak reinforcement layer 1, stirring and reinforcing is performed at the edge of the pipe jacking channel to obtain a stirring and reinforcing layer 3, a concrete wall is constructed on the inner wall 5 of the receiving well, the concrete wall extends downward to 1 meter below the bottom of the receiving well of the pipe jacking machine, thereby being able to play a good partition effect, thereby limiting the area of ​​vibration and stirring reinforcement, and at the end of the receiving channel A concrete reinforcement ring 6 is constructed at the end, and supplementary grouting 20 is constructed between the concrete reinforcement ring and the side wall of the receiving well. The supplementary grouting is concrete slurry, so as to ensure the continuity and stability of the end of the receiving channel, and rotary jet pile reinforcement 4 is constructed at the end of the receiving channel. A steel ring 17 is constructed outside the concrete reinforcement ring. The steel ring can support the concrete reinforcement ring to prevent damage to the side wall of the receiving well and the concrete reinforcement ring during the process of pipe jacking construction, so as to ensure that the pipe jacking machine can stably move out of the pipe jacking channel. Due to the construction of weak reinforcement layer, stirring reinforcement layer and rotary jet pile reinforcement in the receiving channel, the soil layer extrusion and deformation during the pipe jacking process can be reduced, thereby reducing the risk of water gushing and collapse.

[0032] A pipe jacking machine support frame 7 is also installed in the pipe jacking machine receiving well 8. In this embodiment, during the construction process, a compacted soil layer 16 is obtained by tamping the bottom of the pipe jacking machine receiving well, an operating well is excavated near the receiving channel, and a water-blocking layer 18 is constructed on the side wall of the operating well. The water-blocking layer is a water-blocking mortar layer, which can not only block water but also provide stable support. A dewatering well 9 is excavated at the bottom of the operating well to provide a water source for the early construction. A raft 10 is laid at the bottom of the operating well. The raft 10 is cast by concrete to form a stable support for the upper construction structure. A support frame 11 is erected above the raft 11. The support frame 11 is selected A scaffolding is used, and specifically a bowl-hook type scaffolding can be selected, which is easy to erect and can form a stable support. A formwork is cast on the top of the support frame 1 to obtain a raft slab 12. One end of the raft slab 12 extends to connect with the side wall of the receiving shaft of the jacking machine, and the other end extends to the compacted soil layer, thereby providing a more stable support. A backfill soil channel 13 is reserved in the middle of the raft slab 12. The support frame 1 is installed to support the raft slabs 1 and 2. A water slurry layer is formed between the raft slabs 1 and 2. A support frame 2 14 is erected above the raft slab 2. The support frame 2 includes an upward support beam 19. In the embodiment, the support beam is made of a steel pipe with an outer diameter of 600-800mm, and a plurality of vertical ribs 24 are welded and fixed to the outer edge of the upper end of the support beam, thereby providing stable support for the structure above the support beam, and a fixing plate is welded and fixed to the lower end of the support beam, and the fixing plate is attached to the raft slab 2 and fixed by an anchor rod 25, and the lower end of the anchor rod is pre-embedded in the raft slab 2, thereby ensuring the stability of the support beam, and a hardened foundation 36 is constructed on the upper surface of the compacted soil layer, and the hardened foundation is a concrete foundation, and a support platform is constructed above the support frame 2, and the support platform includes a raft slab 3 15. In this embodiment, a formwork is supported at the upper end of the support beam, and concrete is provided. Raft slab three is cast and formed, and raft slab three is connected to the concrete foundation. An operating layer is formed between raft slabs two and three, and an operating channel is reserved in the middle position of raft slab three to facilitate the insertion of compaction tools into the operating layer and the water slurry layer. In the early stage of construction, an operating well and a drainage well are excavated first, and then raft slab one, support frame one, and raft slab two are constructed. An opening corresponding to the drainage well is reserved on raft slab one to facilitate the installation of a drainage pipe. After the weak reinforcement layer, mixing reinforcement layer, rotary jet pile reinforcement, concrete reinforcement ring, and steel ring are completed, support frame two and raft slab three are constructed, and a pipe jacking machine support frame is installed above raft slab three.

[0033] In this embodiment, the pipe jacking machine support frame includes a connecting seat 21, which is formed by welding a rectangular tube or an I-beam, and an upward support column 22 is welded on the connecting seat. The support column is also made of a rectangular tube or an I-beam. The support column consists of two rows and is distributed on both sides of the connecting seat. The support column is written inward, so as to prevent it from bending and deforming outward during the pressure-bearing process. A support beam 23 for supporting the pipe jacking machine is welded and fixed to the upper end of the support column. The support beam is an arc corresponding to the pipe jacking machine, so as to form a stable support. There is an upward opening groove 35 on the working surface of the support beam, and dry quartz sand is filled in the groove, so as to lubricate the surface of the pipe jacking machine and reduce friction. The surface of the pipe jacking machine can also be polished and dried, so as to facilitate the disassembly of the pipe jacking machine. The connecting seat is connected to the raft plate three by ground bolts 26, and has high stability.

[0034] When the jacking pipe is penetrated, the blocking net and crushed soil fall into the receiving well of the jacking machine, fall into the bottom of the operating layer through the backfill soil channel, and then fall into the bottom of the water slurry layer, keeping the receiving well of the jacking machine clean. The jacking machine continues to move to the support frame of the jacking machine, and then the disassembly construction is carried out. During this period, the crushed soil in the jacking machine falls into the backfill soil channel to backfill the operating well. After the disassembly of the jacking machine is completed, the water slurry layer and the lower half of the operating layer are backfilled, and then mortar is poured on the top of the operating layer to support the raft plate three.

[0035] Support frame 1, support frame 2 and pipe jacking machine support frame are all prefabricated and hoisted into the operating well, with a short construction period.

[0036] It is worth noting that the pipe jacking machine receiving shaft of a general subway is excavated near the station. Due to the influence of the surrounding environment, some stations do not have suitable space to excavate the pipe jacking machine receiving shaft, and the rectangular pipe jacking receiving platform is designed inside the station. The station is generally a two-story or three-story underground station.

[0037] The support frame 1 and support frame 2 provided in this embodiment are used for the structure of the underground three-story station. If it is an underground three-story station, the underground negative one-story plate is reserved with holes to set up a receiving steel platform, which falls on the negative second-story middle plate, resulting in a large load on the negative second-story middle plate and the need for support. If a beam is made, it will occupy the lower space. The lower space is designed and cannot be occupied by subway passages and contact networks in the later stage. Or increase the station height to increase the thickness of the negative second-story middle plate, or make a temporary concrete beam and chisel it out after the construction is completed, which has high construction costs. The support frame 1 and support frame 2 provided in this embodiment, when used in the underground three-story station, form a temporary beam to support the negative second-story middle plate, and can also provide detachable support for the reception of the pipe jacking machine. After use, it can be hoisted out of the receiving shaft and reused.

[0038] The rectangular jacking pipe receiving platform provided in this embodiment can be used for receiving round jacking pipe machines, and can also be used for receiving rectangular jacking pipes.

[0039] Example 2

[0040] like Figure 9-10 As shown, a rectangular jacking pipe receiving platform is different from Example 1 in that the support platform includes a cross beam 27, which is made of I-beam and has high structural stability. Longitudinal beams 28 are fixed on both sides of the upper end of the cross beam, and the longitudinal beams are also made of I-beams. The jacking machine support frame is connected to the longitudinal beams. Specifically, there are two groups of longitudinal beams, which are distributed on both sides of the support platform. Any group of longitudinal beams is composed of two mutually parallel I-beams. The support column corresponds to the middle position of the corresponding group of longitudinal beams, thereby stably supporting the jacking machine support frame. A long hole is processed on the edge of the connecting seat, and a downward adjustment wedge 29 is inserted in the long hole. By adjusting the wedge, the position of the jacking machine support frame can be fine-tuned. After adjustment, it is further fixed by welding.

[0041] The support frame 2, the support platform, and the pipe jacking machine support frame provided in this embodiment are prefabricated, wherein the support platform and the pipe jacking machine support frame are fixed by simple welding, hoisted to the operating well, and fixedly welded after adjustment. The construction speed is fast, and the raft slab 3 is not constructed. The construction is fast, and the material falls into the operating layer and the water slurry layer more stably.

[0042] After the pipe jacking machine is disassembled, the second support frame, the support platform, and the pipe jacking machine support frame are hoisted out, and the water slurry layer and the operating layer are backfilled, or the pipe jacking machine support frame is removed and then backfilled directly, and then a concrete layer is made on the top of the operating well to connect it to the hardened foundation.

[0043] Example 3

[0044] like Figure 11-12 As shown, a rectangular jacking pipe receiving platform is different from Example 2 in that the jacking machine support frame is composed of multiple prefabricated parts, among which a connecting seat 21 is made of a rectangular tube, a support rod inclined downward is fixed to the upper end of a support column 22, and two opposite support rods form a support beam 23, thereby supporting both sides of the jacking machine, and an oblique support 34 is installed between the end of the support rod and the connecting seat, thereby improving stability, a positioning column 32 is fixed to the lower end of the connecting seat, the positioning column is made of a rectangular tube, and a tensile plate 33 is installed at the lower end of the positioning column, and the tensile plate extends outside the positioning column, and the prefabricated part can be clamped on the corresponding longitudinal beam through the positioning column and the tensile plate, and the positioning column and the longitudinal beam are pressed tightly to prevent movement and rotation. To further avoid movement, welding can be performed.

[0045] A tensile balancing device is also installed on the outside of the connecting seat, and the tensile balancing device includes a stud 30 installed on the outer end of the connecting seat, a horizontal positioning plate 31 is connected to the lower end of the stud, a nut is mounted on the upper end of the stud, and the positioning plate cooperates with the outer side of the I-beam. Since the inner side of the prefabricated part is subjected to force, a reverse force can be provided through the stud and the positioning plate, thereby reducing the force on the positioning column and the tensile plate and improving the stability of use. Compared with Example 2, the prefabricated part provided in this embodiment can be reused, adjusted on site, and is easier to disassemble. The disadvantage is that the adjustment is more troublesome.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rectangular pipe jacking receiving platform, comprising a receiving channel arranged on the side wall of a pipe jacking machine receiving well, a protection module is arranged at the end of the receiving channel, the protection module comprises a waterproof module and an anti-collapse module, and a pipe jacking machine support frame is also arranged in the pipe jacking machine receiving well, characterized in that: An operation well is arranged at the bottom of the receiving well of the pipe jacking machine corresponding to the receiving channel, a water slurry layer is arranged at the lower end of the operation well, an operation layer is arranged at the upper end of the operation well, a support platform is arranged at the upper end of the operation layer, and a pipe jacking machine support frame is arranged at the upper end of the support platform. The water slurry layer includes a raft plate 1 arranged at the bottom of the operating well, a raft plate 2 is arranged above the raft plate 1, a support frame 1 is arranged between the raft plates 1 and 2, and a water slurry layer is formed between the raft plates 1 and 2. The support platform includes a raft plate three, and the lower end of the pipe jacking machine support frame is connected to the raft plate three. The support platform includes a crossbeam, longitudinal beams are arranged on both sides of the upper end of the crossbeam, and the pipe jacking machine support frame is connected to the longitudinal beams. The pipe jacking machine support frame comprises a connecting seat, an upward supporting column is arranged on the connecting seat, and a supporting beam for supporting the pipe jacking machine is arranged at the upper end of the supporting column.

2. The rectangular jacking pipe receiving platform according to claim 1, characterized in that: A second support frame is arranged above the second raft plate, and a support platform is arranged at the upper end of the second support frame.

3. The rectangular jacking pipe receiving platform according to claim 1, characterized in that: A backfill soil channel is arranged in the middle of the second raft plate.

4. The rectangular jacking pipe receiving platform according to claim 1, characterized in that: The working surface of the support beam is provided with a receiving groove opening upward.

5. The rectangular jacking pipe receiving platform according to claim 1, characterized in that: The side wall of the operating well is provided with a water blocking layer.

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