CN211081874U - Shield tunneling machine cutter head access hole - Google Patents

Abstract

The utility model relates to an access hole for a cutter head of a shield tunneling machine, which comprises: an access hole segment formed by excavating a soil body and arranged vertically; The positioning protection cylinder in the manhole segment; a plurality of supporting protection cylinders pressed into the positioning protection cylinder, two adjacent supporting protection cylinders are connected by butt connection, and continue before pressing into the corresponding supporting protection cylinder A section of soil is excavated downward, so that manholes are formed in the multiple support casings. The manhole of the utility model is supported by a support and protection cylinder. In the process of forming, a section of soil is sunk and a section of the support and protection cylinder is used to support the manhole. During the maintenance process of the cutter head, the deformation is avoided, the operation safety is improved, and the problem of instability of the traditional reinforced concrete structure is effectively solved, which has very high practical value and promotion value.

Description

Shield machine cutter head access hole

technical field

The utility model relates to the field of underground construction engineering, in particular to an access hole for a cutter head of a shield machine.

Background technique

As we all know, when the shield method is used in the construction of long-distance urban subway tunnels, the cutter head of the shield machine is usually repaired or replaced after a certain distance of the shield. The maintenance channel shall be constructed, and the shield machine maintenance hole shall be constructed after the shield machine reaches the shield maintenance channel. For shield machine manholes, the traditional construction method is to manually excavate the reinforcement (usually circumferential reinforcement + vertical reinforcement) and add formwork concrete (usually C20 early strength concrete), but it is known from practice that this method is used. The structure of the manhole made is very unstable. During the maintenance process of the shield machine cutter head, because the shield machine cutter head needs to be rotated, the torque is very large at this time, which can easily cause the deformation of the manhole, which brings great difficulties to the maintenance of the shield machine. Therefore, it is very necessary to develop a more scientific and stable shield machine manhole with sufficient bearing capacity that is not easily deformed.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art, and to provide a shield machine cutter head inspection hole, which solves the problem that the existing reinforced concrete inspection hole is easily deformed due to the influence of the cutter head torque during the cutter head overhaul process, thereby giving Construction brings security risks.

The technical solution to achieve the above purpose is:

The utility model provides an access hole for a cutter head of a shield machine, comprising:

an inspection hole segment formed by excavating the soil body and arranged vertically, the inspection hole segment is located in front of the advancing direction of the shield machine;

a positioning shield pressed into the manhole segment;

A plurality of support and protection cylinders are pressed into the positioning protection cylinder, and two adjacent support and protection cylinders are butt-connected. An inspection hole is formed in the support sleeve.

The manhole of the utility model is supported by a support and protection cylinder. In the process of forming, a section of soil is sunk and a section of the support and protection cylinder is used to support the manhole. During the maintenance process of the cutter head, the deformation is avoided, the operation safety is improved, and the problem of instability of the traditional reinforced concrete structure is effectively solved, which has very high practical value and promotion value.

A further improvement of the access hole for the cutter head of the shield machine of the present invention is that the support tube located at the bottom corresponds to an opening on one side of the cutter head of the shield machine to form an inspection port.

A further improvement of the access hole for the cutter head of the shield machine of the present invention is that the access hole is arranged in a transverse channel located above the shield machine, and the inner wall of the transverse channel is provided with a primary support structure, and the primary support structure is provided with an initial support structure. There is a breakout port corresponding to the manhole segment;

The outer side of the positioning shield is connected and fixed with the main ribs of the grid in the primary support structure at the breaking opening.

A further improvement of the access hole for the cutter head of the shield machine of the present invention lies in that a pushing mechanism located above the supporting and protecting cylinder at the top is installed in the transverse channel, and the corresponding supporting and protecting cylinder is pressed down by the pushing mechanism. .

A further improvement of the access hole for the cutter head of the shield machine of the present invention is that the pushing mechanism includes a pushing plate that is clamped on the top of the corresponding support cylinder and a jack that abuts on the pushing plate. The jack presses down the push plate and then presses down the support sleeve.

A further improvement of the access hole for the cutter head of the shield machine of the present invention is that a lifting mechanism is also installed in the transverse channel, and the corresponding support cylinder is hoisted into the positioning protection cylinder through the lifting mechanism.

A further improvement of the access hole for the cutter head of the shield machine of the utility model lies in that the inner top support of the support and protection cylinder is connected with a plurality of support rods.

A further improvement of the utility model for the inspection hole of the cutter head of the shield machine lies in that the bottom of the supporting and protecting cylinder located at the bottom is provided with a bottom sealing structure.

A further improvement of the utility model for the access hole of the cutter head of the shield machine lies in that the bottom cover structure includes a plurality of profiled steel parts that are fully laid on the bottom of the support cylinder, and the top support of the profiled steel pieces is connected to the support at the bottom. inner wall of the barrel.

A further improvement of the access hole for the cutter head of the shield machine of the present invention is that the inner wall of the support and protection cylinder is provided with a climbing ladder, and the climbing ladder is arranged from the top of the access hole to the bottom of the access hole.

Description of drawings

Figure 1 is a cross-sectional view of the utility model after the shield machine cutter head inspection hole has been constructed.

Fig. 2 is a perspective view of the utility model from the top down after the inspection hole of the cutter head of the shield machine has been constructed.

FIG. 3 is a top view of the opening of the inspection hole of the shield machine cutter head of the utility model.

4 is a schematic structural diagram of lifting and transporting earthwork during the construction of the manhole of the shield machine cutter head of the utility model.

FIG. 5 is a schematic structural diagram of the utility model for the maintenance of the shield machine cutter head through the inspection hole of the shield machine cutter head.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , the present utility model provides an access hole for a cutter head of a shield machine, which is used to solve the problem that the existing reinforced concrete access hole is prone to deformation and brings about potential safety hazards. The maintenance hole of the cutter head of the shield machine of the utility model adopts the support and protection cylinder as the support, and the support and protection cylinder adopts the steel protection cylinder, which has sufficient strength and can keep the cutter head even if it is subjected to a large torque force during the maintenance of the cutter head. The structure is stable and provides safety guarantee for construction workers. During the construction of the manhole of the utility model, the positioning protection cylinder is first used to locate the top of the access hole to be formed, and then the support cylinder is installed in the positioning protection cylinder, and the construction is carried out by pressing into the support cylinder while excavating soil. The installation accuracy of the supporting and protecting cylinder can be guaranteed, and the manhole of the utility model has many advantages, such as economy, practicality, convenient operation, safety and reliability. The following describes the access hole of the shield machine cutter head of the utility model with reference to the accompanying drawings.

Referring to Fig. 1, there is shown a cross-sectional view of the utility model after the repair hole of the shield machine cutter head has been constructed. Referring to FIG. 4 , there is shown a schematic structural diagram of lifting and transporting earthwork during the construction of the manhole of the shield machine cutter head of the present invention. 1 and FIG. 4, the utility model shield machine cutter head inspection hole will be described.

As shown in Figures 1 and 4, the shield machine cutter head access hole of the present invention includes a manhole segment, a positioning protection cylinder 22 and a plurality of support protection cylinders 23, and the shield machine cutter head access hole is provided in the soil body. In 10, the shield machine cutter head inspection hole is arranged in front of the shield machine forward direction, and is used for overhauling the shield machine cutter head at the position where the shield machine is excavated to the inspection hole. Usually, when the excavation distance of the shield machine is long, a plurality of inspection positions will be set on the excavation road strength of the shield machine. The cutter head of the shield machine is overhauled. During the construction of the access hole of the shield machine cutter head of the utility model, the soil body is first excavated at the set position to form the access hole segment, that is, a section of soil body is excavated downward to form the access hole segment, and the access hole segment is formed. It is located in front of the forward direction of the shield machine, and then the positioning protection cylinder 22 is pressed into the inspection hole segment. The positioning protection cylinder 22 is arranged at the top of the access hole to be formed, and the positioning protection cylinder 22 is used to play a positioning role; The support sleeve 23 is pressed into the positioning sleeve 22, and the two adjacent support sleeves 23 are connected by butt connection. An inspection hole is formed in the supporting and protecting cylinder 23 . The soil excavation is carried out by manual excavation, and the earthwork is excavated in sections, and the support and casing are also sunk in corresponding sections to improve the safety of the manhole.

The support and protection cylinder 23 is used to play a supporting role, and the inner of the support and protection cylinder 23 forms an inspection hole, that is, the interior of the support and protection cylinder 23 is the maintenance work space, and the rigidity of the support and protection cylinder 23 is used to provide safety for construction workers. The stable operating environment provides a guarantee for the safety of maintenance operations.

In a specific implementation manner, as shown in FIG. 5 , the support and protection cylinder 23 located at the bottom corresponds to the opening of one side of the cutter head of the shield machine 31 to form an inspection port 231 . Preferably, the inspection opening 231 is formed by cutting off part of the supporting and protecting cylinder 23. When constructing the inspection opening 231, the size of the inspection opening 231 is designed to match the size of a spoke on the cutter head, and with the rotation of the cutter head, All the tools on the cutter head can be overhauled. In addition, the size of the inspection opening 231 is designed to be small, which can avoid a greater impact on the overall strength of the supporting and protecting cylinder 23 , and can ensure the structural strength and stability of the supporting and protecting cylinder 23 .

In a specific embodiment, as shown in Figures 1 and 2, the shield machine cutter head access hole of the present invention further includes a reinforcement structure 21. Before excavating the soil body to form the access hole segment, the soil body is first The reinforcement forms a reinforcement structure 21 . The reinforcement structure 21 is formed by grouting reinforcement around the design position of the access hole. The grouting direction adopts WSS backward deep hole grouting. The reinforcement structure 21 is arranged around the design position of the access hole, and the width of the reinforcement structure 21 is the inner diameter of the access hole. 3 times, and the depth is 1m below the design elevation of the bottom of the manhole. The grouting pressure is controlled at 0.5MPa～1.0MPa, the diffusion radius is 0.75m, and the grouting slurry is cement-water glass slurry. Preferably, the grouting needs to be completed beyond the distance between the shield machine and the inspection hole greater than 50m to ensure that the slurry will not spread into the shield machine. By setting the reinforcement reinforcement 21, the strength of the soil around the access hole to be formed is strengthened, the structural stability of the soil within the range is also improved, and the stability of the access hole is further improved.

In a specific embodiment, as shown in FIG. 1 and FIG. 2 , the inspection hole is provided in the transverse channel 13 located above the shield machine, and the transverse channel 13 is provided in the left-line shield tunnel 11 and the right-line shield tunnel 12 Above, the manholes to be formed are arranged in front of the corresponding left-line shield tunnel 11 and right-line shield tunnel 12 . The inner wall of the transverse channel 13 is provided with a primary support structure, and the primary support structure is provided with a breaking opening corresponding to the manhole segment; the outer side of the positioning shield 22 is connected and fixed with the grid main rib in the primary supporting structure at the breaking opening. As shown in FIG. 3 , the primary support structure 131 provided on the inner wall of the transverse channel 13 is a reinforced concrete structure formed by spraying concrete on the main bars 132 of the grid. After completion, the grille main rib 132 is cut off. During the cutting, part of the grille main rib 132 is left at the periphery of the breaking opening. When the positioning guard 22 is constructed, the positioning guard 22 and the grille main rib left at the periphery of the breaking opening are separated. 132 is welded and fixed to improve the structural stability of the positioning shield 22.

When the positioning shield 22 is pressed down, the bottom of the positioning shield 22 is pressed against the solid ground, so as to provide a stable and firm support for the positioning shield 22 . And the top of the positioning shield 22 is partially protruded in the transverse channel 13, and the protruding part of the positioning shield 22 effectively protects the construction safety in the manhole, and prevents the sundries at the bottom of the transverse channel 13 from falling to the ground. Danger of falling objects caused by entering the manhole. Preferably, the height of the protruding portion of the positioning shield 22 in the transverse channel 12 is 20 cm.

Further, as shown in FIG. 4 , in order to improve the structural stability of the positioning guard 22 , a guard ring structure 26 is provided on the outer periphery of the positioning guard 22 , and the guard ring structure 26 is fixedly connected with the grille main rib 132 on the periphery of the breaking opening. . Further, before the positioning guard 22 is arranged, a plurality of grid main bars at the breaking opening are connected together by annular reinforcing bars to form a whole. Preferably, the retaining ring structure 26 is an annular steel plate, which is sleeved on the positioning shield 22 and welded with the positioning shield 22, and then the annular steel plate is placed on the periphery of the breaking opening and is connected with the corresponding grid main rib for support. The function of positioning the positioning shield 22.

In a specific embodiment, as shown in FIG. 4 , a pushing mechanism 24 located above the supporting and protecting cylinder 23 at the top is installed in the transverse channel 13 , and the corresponding supporting and protecting cylinder is pressed down by the pushing mechanism 24 twenty three.

When installing the support sleeve 23 , first hoist a support sleeve 23 into the positioning sleeve 22 , and then push the top of the support sleeve 23 by the pushing mechanism to push the support sleeve 23 down into place. Then, a section of soil is excavated downward. Due to the friction between the support cylinder 23 and the soil, the support cylinder 23 will not fall to the bottom of the newly excavated hole, and then another one is hoisted. Protecting and protecting cylinder 23, continue to press the other supporting and protecting cylinder 23 into the positioning and protecting cylinder 22 through the pushing mechanism, and connect the butt joints of the two supporting and protecting cylinders 23, and so on until the bottom of the supporting and protecting cylinder 23. The barrel 23 reaches the design elevation of the bottom of the manhole.

Further, the push mechanism 24 includes a push plate 241 that is clamped on the top of the corresponding support cylinder 23 and a jack 242 that abuts on the push plate 241 , and the jack 242 pushes the push plate 241 down and then pushes down the support. Guard 23. Preferably, the push plate 241 is an annular plate, and the bottom of the annular plate is provided with an annular clamping groove, through which the annular clamping groove is clamped on the top of the supporting cylinder 23, and the annular plate is placed on the supporting cylinder 23. On the top of the protective cylinder 23, the size of the annular plate is relatively large, which provides a relatively stable thrust force surface for the jack 242, so that the jacking force of the jack 242 can be evenly transmitted to the supporting and protective cylinder 23, so as to avoid supporting and protecting the cylinder 23. The barrel 23 is press-deformed. Preferably, the push plate 241 is a steel plate with a width of 100 mm.

Specifically, a beam 27 is laterally supported in the transverse channel, the end of the jack 242 is fixed on the beam 27, and the beam 27 is used to provide the jack 242 with a backrest. Preferably, the beam 27 is provided with multiple channels.

Still further, as shown in FIG. 4 , a lifting mechanism 25 is also installed in the transverse channel 13 , and the corresponding support cylinder 23 is hoisted into the positioning protection cylinder 22 through the lifting mechanism 25 . Preferably, the hoisting mechanism 25 includes a hoist 251 disposed in the transverse channel 13, a fixed pulley 252 fixed on the transverse channel 13 and located above the positioning guard 22, and a hoisting rope 253 wound on the hoisting machine 251. The hoisting end of the 253 bypasses the fixed pulley 252 and can be lowered into the positioning shield 22 . The hoisting end is connected to the supporting shield 23 , and the supporting shield 23 can be hoisted to the positioning shield 22 . The fixed pulley 252 can be installed and fixed on a corresponding beam 27 .

Preferably, two ends of the supporting and protecting cylinder 23 are fixed with lifting lugs. When hoisting, the hoisting end of the suspending rope 253 is connected to the lifting lugs, and then the supporting and supporting cylinder 23 is hoisted in place. When two adjacent supporting and protecting cylinders 23 are butt-connected, the two supporting and protecting cylinders can be fastened by aligning the lifting ears and then using bolts passing through the two lifting ears.

When installing the support and support cylinder 23, ensure that the center deviation of the support cylinder 23 and the pile hole formed by the excavated soil body is not greater than 2cm, and strictly control the verticality of the support and protection cylinder 23 and the inclination of the support and protection cylinder not more than 1%. After the support cylinder 23 is installed in place, the surrounding of the support cylinder 23 is backfilled with clay with water evenly, and the moisture content of the clay is added according to the required fluidity. Clay can be used to compact the gap between the support sleeve 23 and the positioning sleeve 22, and when there is a gap between the support sleeve 23 and the inner wall of the pile hole formed by the excavated soil, the clay can also be filled and compacted.

The specific process of installing the supporting and protecting cylinder 23 is as follows: after the positioning and protecting cylinder 22 is installed, the first supporting and protecting cylinder is installed, and a 1-ton chain hoist is used to place the supporting and protecting cylinder into the positioning and protecting cylinder, and then the positioning Position the support tube in the protection tube, and excavate the earth after positioning. The depth of each excavation is about 200mm. After the earth excavation is completed, a 5-ton jack is used to push the jacking mechanism on the support tube to make the support and protection work. The cylinder sinks, after pushing 200mm, excavate the earth again 200mm downward, and then the jack continues to push, repeating the cycle, before the top of the tail of the first support cylinder enters the positioning protection cylinder 22, hoist the next support cylinder , after connecting the bottom of the support cylinder with the top of the first support cylinder with bolts, continue to push the top support cylinder with a jack, at this time install the push plate on the top of the support cylinder On the top, and then the jack is pushed to the push plate, and the support cylinder is continuously lowered, and the circular excavation and push are carried out until the design elevation of the bottom of the manhole is reached.

Still further, a soil bucket 254 can be connected to the hoisting end of the suspending rope 253 , and the soil bucket 254 can be used for hoisting and transporting the soil formed by the excavated earthwork into the transverse channel 13 , and then transported out from the transverse channel 13 .

In a specific embodiment, after the support and protection cylinder 23 is installed, a plurality of struts are supported and connected in the support and protection cylinder 23 , and the support rods are used to enhance the structural stability of the support and protection cylinder 23 .

In a specific embodiment, in order to prevent personnel from falling into the artificially dug piles, an openable guardrail with a height of 1200 mm is installed on the outer periphery of the positioning guard tube 22 .

In a specific implementation manner, a bottom cover structure is provided at the bottom of the support cylinder 23 located at the bottom. The bottom of the support cylinder 23 is sealed by the bottom cover structure, so that the bottom of the access hole is closed, which can be effectively isolated from the external soil, so as to prevent the external soil from being disturbed and changed by the rotation of the cutter head, which will affect the stability of the access hole. improve work safety.

Preferably, the bottom cover structure includes a plurality of profiled steel parts that are fully laid on the bottom of the support cylinder 23, and the top support of the profiled steel parts is connected to the inside of the support cylinder located at the bottom.

In a specific embodiment, the inner wall of the support and protection cylinder 23 is provided with a climbing ladder, and the climbing ladder is arranged from the top of the access hole to the bottom of the access hole. The ladder can be used to facilitate personnel to enter and exit the manhole.

Specifically, the positioning shield 22 and the supporting shield 23 of the present invention are made of Q235 steel shield, wherein the diameter of the positioning shield 22 is larger than that of the supporting shield 23 by 10 cm. The positioning shield is 0.7m long, buried at a depth of 0.5m, and has a wall thickness of 6mm. The length of the support tube 23 is designed to be one-fifth of the depth of the manhole, and the thickness is 15mm, and each section of the support tube has four lifting ears for hoisting. The jacking plate of the jacking mechanism is provided with holes corresponding to the lifting lugs, which does not affect the lifting and jacking operations of the support cylinder.

The present invention has been described in detail above with reference to the embodiments of the accompanying drawings, and those of ordinary skill in the art can make various modifications to the present invention according to the above description. Therefore, some details in the embodiments should not be construed to limit the present invention, and the present invention will take the scope defined by the appended claims as the protection scope of the present invention.

Claims (10)

1. The utility model provides a shield constructs quick-witted blade disc manhole which characterized in that includes:

the method comprises the following steps of excavating a manhole section which is formed by a soil body and is vertically arranged, wherein the manhole section is positioned in front of the advancing direction of the shield tunneling machine;

the positioning protective cylinder is pressed into the access hole section;

and pressing the supporting and protecting cylinders into the positioning and protecting cylinders, wherein two adjacent supporting and protecting cylinders are in butt joint connection, and continuously downwards excavating a section of soil body before pressing the corresponding supporting and protecting cylinders, so that access holes are formed in the supporting and protecting cylinders.

2. The shield tunneling machine cutterhead access hole of claim 1, wherein the support shield at the bottom forms an access opening corresponding to an opening at one side of the shield tunneling machine cutterhead.

3. The shield tunneling machine cutterhead manhole of claim 1, wherein the manhole is provided in a cross passage above the shield tunneling machine, the inner wall of the cross passage is provided with a primary support structure, and the primary support structure is provided with a breaking opening corresponding to a segment of the manhole;

the outer side of the positioning protective cylinder is fixedly connected with a main grid rib in the primary support structure at the breaking opening.

4. The shield tunneling machine cutterhead manhole of claim 3, wherein a jacking mechanism is installed in the transverse channel above the top supporting casing, and the corresponding supporting casing is pressed down by the jacking mechanism.

5. The shield tunneling machine cutterhead manhole of claim 4, wherein the pushing mechanism includes a pushing plate snap-fitted to the top of the corresponding supporting casing and a jack abutting against the pushing plate, the pushing plate being pressed down by the jack to further press down the supporting casing.

6. The shield tunneling machine cutterhead manhole of claim 3, wherein a lifting mechanism is further installed in the transverse channel, and the corresponding support casing is hoisted into the positioning casing through the lifting mechanism.

7. The shield tunneling machine cutterhead manhole of claim 1 wherein a plurality of struts are connected to the inner top struts of the supporting casing.

8. The shield tunneling machine cutterhead manhole of claim 1 wherein a bottom sealing structure is provided at the bottom of the bottom support casing.

9. The shield tunneling machine cutterhead access hole of claim 8, wherein said bottom-sealing structure includes a plurality of section steel members fully laid on the bottom of said support casing, said section steel members being connected to the inner wall of the support casing at the bottom by means of a top brace.

10. The shield tunneling machine cutterhead manhole of claim 1 wherein the inner wall of the supporting casing is provided with a ladder that runs from the top of the manhole to the bottom of the manhole.

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