A shield receiving semi-open steel sleeve mechanism and its construction method

Abstract

The present invention relates to the technical field of underground tunnel excavation construction, and in particular to a shield receiving semi-open steel sleeve mechanism and a construction method thereof, comprising a steel sleeve body, a short steel sleeve, an arc-shaped side retaining plate strip, and a reinforcing cover plate for mounting a shield machine, wherein the steel sleeve body is composed of a front unit steel sleeve and a rear unit steel sleeve connected in sequence along its axial direction; the front end face of the front unit steel sleeve is connected to a receiving shaft door wall in a semi-open manner, the short steel sleeve is arranged outside the front unit steel sleeve, the front end of the short steel sleeve is connected to the receiving shaft door wall, and the inner wall of the rear end is connected to the outer wall of the front unit steel sleeve through a connecting mechanism. The present invention solves the problem of cracking and pressure maintenance failure at each connection of the steel sleeve during the shield receiving and advancing process, greatly reducing the construction safety risk of the steel sleeve shield receiving; the problem of slow efficiency in removing the steel sleeve is solved through the transition space, thereby accelerating the construction progress.

Description

Technical Field

[0001] The invention relates to the technical field of underground tunnel excavation construction, and in particular to a shield receiving semi-open steel sleeve mechanism and a construction method thereof. Background Art

[0002] Because subway shield construction is carried out section by section, after the shield machine completes the construction task of a section tunnel, it needs to exit the tunnel and enter the receiving work well. If the environmental conditions are relatively good and allowed, it is usually necessary to reinforce the soft strata at the end of the station receiving well to prevent the sudden surge and sand flow in the stratum when the maintenance structure in the station well wall is broken, which will then cause the stratum to collapse. But sometimes, due to various reasons, the end well cannot be reinforced or the effect of the end reinforcement treatment of the soft stratum is not good enough, then whether the shield machine can be safely and accurately received becomes a key issue in shield construction.

[0003] At present, the steel sleeve receiving auxiliary process is more popular. It has been applied in many subway projects and has been successful and well-received. However, careful research has found that there are still obvious deficiencies and even potential safety hazards. That is, the thrust given to the steel sleeve by the friction of the bottom surface of the shield casing during the shield machine entering the steel sleeve, and the thrust of the cutter head acting on the crown cover through the mud, may cause cracking and pulling off at the junction of the embedded ring plate around the tunnel door and the steel sleeve, or at the junction between the steel sleeves, resulting in sealing and pressure maintenance failure, until sand and soil flow, resulting in the failure of the project construction. Therefore, the stiffness and support requirements of the reaction frame are very high, and a slight deformation is enough to make all the previous efforts go to waste.

[0004] In this context, the semi-open steel sleeve of the present invention is not tightly and rigidly combined with the embedded ring plate around the tunnel portal at the front end, but adopts an embedded contact-type closed connection. Even if the reaction frame support has a certain micro-deformation, the receiving steel sleeve is not affected by the thrust force generated by the shield operation. The invention has a unique concept, which completely subverts the current practice and changes from passive to active, thereby overcoming the aforementioned deficiencies and achieving a major technical breakthrough. While ensuring construction safety, it simplifies the construction process, reduces the difficulty of operation, and speeds up the construction progress. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a shield receiving semi-open steel sleeve mechanism and a construction method thereof, which can reduce construction safety risks and solve the problems of unreasonable force in the current steel sleeve receiving system device.

[0006] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0007] The present invention discloses a semi-open steel sleeve mechanism for shield machine reception, which includes a steel sleeve body for sleeving the shield machine, a short steel sleeve, an arc-shaped side soil retaining plate strip, a strengthening cover plate, a reaction frame, a large grouting pipe orifice, a small grouting pipe orifice, and a slurry discharge pipe orifice. The steel sleeve body is composed of a front unit steel sleeve and a rear unit steel sleeve connected in sequence along its axial direction. The front unit steel sleeve and the rear unit steel sleeve are respectively composed of a front semi-circular steel cylinder, a front semi-circular steel cylinder with a base, a rear semi-circular steel cylinder, and a rear semi-circular steel cylinder with a base in combination along their circumferential directions. The front end face of the front unit steel sleeve is semi-openly connected to the portal wall of the receiving well. The short steel sleeve is arranged outside the front unit steel sleeve. The front end of the short steel sleeve is connected to the portal wall of the receiving well, and the inner wall of its rear end is connected to the outer wall of the front unit steel sleeve through a connecting mechanism. The strengthening cover plate is fixedly connected to the rear end of the rear unit steel sleeve, and a reaction frame support is installed behind the strengthening cover plate. The reaction frame support is fixedly connected to the bottom plate of the receiving well. The large grouting pipe orifices are respectively arranged above the middle parts of the front unit steel sleeve and the rear unit steel sleeve. The small grouting pipe orifice is located above the tail of the rear unit steel sleeve. The two slurry discharge pipe orifices are respectively located below the rear steel sleeve unit and below the strengthening cover plate.

[0008] The connecting mechanism includes an outer ring channel steel fixed on the inner wall of the rear end of the short steel sleeve, an inner ring channel steel fixed on the outer wall of the front end of the front unit steel sleeve, and a rubber bladder ring. The inner ring channel steel and the outer ring channel steel are annular structures with a "concave" cross-section, and a cavity for placing the rubber bladder ring is formed between them. The rubber bladder ring is a water-stop rubber bladder ring that can be inflated with air or slurry, and a nozzle for inflating with air or slurry and communicating with the outside is provided on its side wall.

[0009] The front end face of the front unit steel sleeve is semi-openly connected to the portal wall of the receiving well through a ring-shaped steel groove. An embedded ring-shaped steel plate for fixedly connecting with the ring-shaped steel groove is arranged in the portal wall of the receiving well. The ring-shaped steel groove is an annular structure with a "匚"-shaped cross-section, and an elastic water-stop ring is arranged inside it. The front end face of the front unit steel sleeve is embedded in the ring-shaped steel groove and is in tight contact with the elastic water-stop ring.

[0010] The elastic water-stop ring is a circular arc-shaped water-stop rubber strip with a certain thickness and width or a circular arc-shaped waterproof geotextile strip bag filled with slurry inside.

[0011] The front flange of the short steel sleeve is fixedly connected to it through preset expansion bolts arranged on the portal wall of the receiving well, and a water-stop sheet is arranged therebetween.

[0012] An annular angle steel is fixed on the inner wall of the rear end of the rear steel sleeve unit. The annular angle steel is an annular structure with an "L"-shaped cross-section, and its periphery is connected to the arc-shaped side soil retaining plate strip through bolts.

[0013] The reinforced cover plate is connected to the rear end face of the rear steel sleeve unit through flange bolts, and a water-stop rubber sheet is arranged between the two; a steel wedge block is arranged between the reinforced cover plate and the reaction frame for tightening the steel sleeve body and the elastic water-stop ring; the base of the steel sleeve body is installed with a ground anchor for anchoring to the bottom plate of the receiving well.

[0014] A construction method for a shield receiving a semi-open steel sleeve mechanism comprises the following steps:

[0015] Step 1: The tail of the front semicircular steel cylinder with the base is connected to the front of the rear semicircular steel cylinder with the base through flange bolts, and rubber sheets are arranged between the connections to stop water;

[0016] Step 2: The front semicircular steel cylinder is covered on the front semicircular steel cylinder with a base, and the rear semicircular steel cylinder is covered on the rear semicircular steel cylinder with a base, and the flange bolts are used to connect them. Then, the front and rear semicircular steel cylinders are connected with flange bolts, and rubber sheets are set between each connection to stop water, so as to form a receiving steel sleeve body;

[0017] Step 3: The annular steel groove and the pre-buried annular steel plate in the concrete of the receiving well hole gate wall are welded in sections to be sealed and firm, and then each section of the annular steel groove is welded to form an annular groove, and an elastic water stop ring is embedded inside;

[0018] Step 4: the short steel sleeve is passed through the flange and the expansion bolt holes preset in the concrete of the receiving well hole door wall, and is tightened with nuts, with a water-stop rubber sheet arranged in between;

[0019] Step 5: welding the outer ring channel steel to the inner side of the end of the short steel sleeve, and welding the inner ring channel steel to the outer wall of the front unit steel sleeve, and embedding the rubber bladder ring in the cavity formed between the two;

[0020] Step 6: The front end of the front unit steel sleeve is inserted into the annular steel groove, and the elastic water stop ring in the annular steel groove is pressed tightly. The measuring axis meets the requirements of the design and construction plan;

[0021] Step 7: Apply pressure to the rubber bladder ring through the mouth to inject mud or inflate it to stop water;

[0022] Step 8, the annular angle steel is welded to the inner wall of the rear unit steel sleeve near the rear end;

[0023] Step nine, the bolts on the circular angle steel are put on the circular holes of the arc-shaped edge retaining plate strips and tightened with nuts; arc-shaped grooves are arranged between the arc-shaped edge retaining plate strips, and rubber membranes are used to stop water between the seams, and the whole is assembled into a circular jigsaw puzzle;

[0024] Step 10: The reinforcing cover plate is covered on the tail of the rear unit steel sleeve and is firmly connected with flange bolts, and a circular thin water-stopping rubber sheet is arranged between them;

[0025] Step 11, the reaction frame is installed after the reinforcement cover plate and is firmly fixed to the bottom plate of the receiving well;

[0026] Step 12: The steel wedge is embedded between the reinforcing cover plate and the reaction frame, so that the front end surface of the front unit steel sleeve presses the elastic water stop ring in the annular steel groove to produce a certain elastic compression deformation;

[0027] Step 13, the base is anchored to the bottom plate of the receiving well through a ground anchor;

[0028] Step 14: The large grouting nozzle and the small grouting nozzle are connected to an external mud pump to perform pressure grouting, and the pressure is maintained for a certain period of time to ensure good sealing and no leakage, so as to prepare to receive the shield machine;

[0029] Step 15, after the shield machine enters the receiving steel sleeve or when the mud pressure is too high, the slurry discharge pipe opening is gradually opened to discharge the mud and relieve the pressure;

[0030] Step 16, after the reaction frame is removed, the reinforcement cover is opened to remove the mud;

[0031] Step seventeen, the arc-shaped edge retaining strips are removed one by one from top to bottom, the mud is cleared, and the receiving is completed.

[0032] The outstanding beneficial effects of the present invention are:

[0033] 1. The front end face of the front unit steel sleeve of the present invention is not tightly and firmly rigidly connected to the annular steel groove, but cleverly forms an inlaid top-tight contact-type closed connection with the front end face of the front unit steel sleeve through an elastic water stop ring. The invention has a unique idea, completely subverts the current practice, and changes from passive to active, thereby overcoming the above-mentioned shortcomings and achieving a major technical breakthrough. Under the condition of ensuring construction safety, the construction process is simplified, the operation difficulty is reduced, and the construction progress can be accelerated;

[0034] Because the reaction frame support will certainly be deformed under the large thrust generated by the shield operation, if the control is not in place, the receiving steel sleeve will be subjected to tension, and in severe cases, the rigid joints between the embedded ring plate around the tunnel door and the steel sleeve or between the steel sleeves will be cracked or pulled off, resulting in sealing and pressure maintenance failure, and even sand and soil flow, causing the construction to fail. Therefore, the rigidity and support requirements of the reaction frame are very high, and the operation difficulty is increased, otherwise a tiny deformation is enough to make all the previous work go to waste.

[0035] 2. The present invention strengthens the cover plate on the rear end cover of the rear unit steel sleeve to replace the currently used crown cover plate. The external flange can be used to connect with the rear unit steel sleeve, which can save the reinforcing ring beam and is easy to install. The wedge push rod of the reaction frame can act on the middle part of the reinforced cover plate in addition to acting in the direction of the steel sleeve body, so that the force distribution is more uniform, which is beneficial to balancing the water and soil pressure on the cover plate caused by the thrust of the cutter disc acting on the mud in the steel sleeve, avoiding the problem that all the reaction forces are borne by the steel sleeve, and reducing the internal force of the steel sleeve.

[0036] In the past, the crown cover plate did not contact the top rod of the reaction frame. The thrust of the cutter head acted on the mud in the steel sleeve, then acted on the crown cover plate through the mud, and then was transmitted to the cylinder of the surrounding steel sleeve through the periphery of the crown cover plate. The force path was complicated. In addition, the crown cover plate needed to be bolted inside the steel sleeve, which was troublesome to install and remove.

[0037] 3. The present invention arranges an arc-shaped edge retaining plate strip near the rear end of the rear unit steel sleeve, and forms a transition space between the arc-shaped edge retaining plate strip and the reinforced cover plate. On the one hand, the leakage pressure between the reinforced cover plate and the steel sleeve body is reduced. On the other hand, during demolition, the pressure can be quickly relieved between the retaining wall plate and the cover plate, which is conducive to the removal of the reinforced ring beam, and then the retaining plate and mud can be safely removed from top to bottom, thereby reducing the construction period. In the past, it was impossible to directly remove the crown cover plate first, because the residual mud was high and the soil pressure was high, which easily caused safety hazards when removing the crown cover plate. It was necessary to clear the mud first, resulting in a relatively long demolition process.

[0038] 4. In the present invention, a short steel sleeve is provided, and inner and outer ring groove steel clamp rubber bag rings are cleverly provided, so that the inner and outer spaces of the steel sleeve body are closed, thereby avoiding the problems of tearing and water leakage between the steel sleeve body and the tunnel door due to various accidents, and forming a double safety insurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a longitudinal schematic diagram of the receiving steel sleeve in the present invention;

[0040] Figure 2 It is a schematic diagram of the inlay contact connection and the connection mechanism in the present invention;

[0041] Figure 3 yes Figure 1 Schematic diagram of the middle AA section;

[0042] Figure 4 It is a schematic diagram of the installation layout of the retaining plate in the present invention.

[0043] In the figure: front unit steel sleeve 101, rear unit steel sleeve 102, front semicircular steel cylinder 1, rear semicircular steel cylinder 2, front semicircular steel cylinder with base 3, rear semicircular steel cylinder with base 4, annular steel groove 5, elastic water stop ring 6, short steel sleeve 7, inner ring channel steel 8, outer ring channel steel 9, rubber leather ring 10, annular angle steel with bolts 11, arc edge retaining strip 12, reinforced cover plate 13, circular thin water stop rubber sheet 14, reaction frame 15, base 16, large grouting pipe mouth 17, slurry discharge pipe mouth 18, flange 19, flange bolt 20, receiving shaft door wall 21, embedded annular steel plate 22, expansion bolt 23, mouth 24, bolt 25, flange bolt 26, receiving shaft bottom plate 27, steel wedge 28, anchor 29, small grouting pipe mouth 30, shield machine 31, annular water stop rubber sheet 32. DETAILED DESCRIPTION

[0044] The present invention is further described below:

[0045] See also Figure 1-4 , which is an arc-shaped water-stop rubber strip with a certain thickness and width

[0046] The present invention discloses a shield receiving semi-open steel sleeve mechanism, comprising a steel sleeve body for mounting a shield machine 31, a short steel sleeve 7, an arc-shaped side retaining plate strip 12, a reinforcing cover plate 13, a reaction frame 15, a large grouting pipe opening 17, a small grouting pipe opening 30, and a grouting pipe opening 18. The steel sleeve body is composed of a front unit steel sleeve 101 and a rear unit steel sleeve 102 connected in sequence along its axial direction; the front unit steel sleeve 101 and the rear unit steel sleeve 102 are respectively composed of a front semicircular steel cylinder 1, a front semicircular steel cylinder with a base 3, and a rear semicircular steel cylinder 102 along their circumferential direction. The rear semicircular steel cylinder 2 and the rear semicircular steel cylinder 4 with a base are combined; the front end surface of the front unit steel sleeve 101 is connected to the receiving well hole door wall 21 in a semi-open manner, the short steel sleeve 7 is arranged outside the front unit steel sleeve 101, the front end of the short steel sleeve 7 is connected to the receiving well hole door wall 21, and the inner wall of the rear end is connected to the outer wall of the front unit steel sleeve 101 through a connecting mechanism; the reinforcing cover plate 13 is fixedly connected to the rear end of the rear unit steel sleeve 102, and the reaction frame support 15 is installed behind the reinforcing cover plate 13 , the reaction frame support 15 is fixedly connected to the receiving well bottom plate 27; the large grouting pipe opening 17 is respectively arranged above the middle of the front unit steel sleeve 101 and the rear unit steel sleeve 102; the small grouting pipe opening 30 is located above the tail of the rear unit steel sleeve 102; the two grouting pipe openings 18 are respectively located below the rear steel sleeve unit 102 and below the reinforced cover plate 13, the large grouting pipe opening 17 and the small grouting pipe opening 30 are both steel pipes with tees, and the grouting pipe opening 18 has a valve orifice; the reaction frame 15 is with An obliquely supported steel frame; a reinforcing cover plate 13 is provided on the rear end cover of the rear unit steel sleeve 102 to replace the currently used crown cover plate; an external flange can be used to connect the rear unit steel sleeve 102, which can save a reinforcing ring beam and is easy to install; the wedge push rod of the reaction frame can act not only in the direction of the steel sleeve body, but also in the middle of the reinforced cover plate 13, so that the force distribution is more even, which is beneficial to balancing the water and soil pressure on the cover plate caused by the thrust of the cutter disc acting on the mud in the steel sleeve, avoiding the problem that all the reaction forces are borne by the steel sleeve, and reducing the internal force of the steel sleeve.

[0047] The connecting mechanism includes an outer ring channel steel 9 fixed on the inner wall of the rear end of the short steel sleeve 7, an inner ring channel steel 8 fixed on the outer wall of the front end of the front unit steel sleeve 101, and a rubber bladder ring 10. The inner ring channel steel 8 and the outer ring channel steel 9 are annular structures with a "concave" cross-section, and a cavity for placing the rubber bladder ring 10 is formed between the two. The rubber bladder ring 10 is a waterproof rubber bladder ring that can be inflated with air or mud. A mouth 24 for inflation or mud connected to the outside is provided on its side wall. A short steel sleeve 7 is set, and inner and outer ring channel steels are cleverly set to clamp the rubber bladder ring 10, so that the internal and external spaces of the steel sleeve body are closed, avoiding the problems of tearing and leakage between the steel sleeve body and the tunnel door due to various accidents, forming a double safety insurance.

[0048] The front end face of the front unit steel sleeve 101 is semi-openly connected to the receiving well portal wall 21 through an annular steel groove 5. An embedded annular steel plate 22 for fixedly connecting with the annular steel groove 5 is arranged in the receiving well portal wall 21. The annular steel groove 5 is an annular structure with a "C"-shaped cross-section, and an elastic water stop ring 6 is arranged inside it. The front end face of the front unit steel sleeve 101 is embedded in the annular steel groove 5 and is in tight contact with the elastic water stop ring 6. The front end face of the front unit steel sleeve 101 and the annular steel groove 5 do not adopt a tightly fixed rigid connection, but are ingeniously hermetically connected through the elastic water stop ring 6 being in tight contact with the front end face of the front unit steel sleeve 101. The inventive concept is unique, completely subverting the current practice, changing from passive to active, thus overcoming the aforementioned deficiencies and achieving a major technological breakthrough. Under the condition of ensuring construction safety, the construction process is simplified, the operation difficulty is reduced, and the construction progress can be accelerated.

[0049] The elastic water stop ring 6 is a circular arc-shaped water stop rubber strip with a certain thickness and width, or a circular arc-shaped waterproof geotextile strip bag filled with slurry inside.

[0050] The front flange of the short steel sleeve 7 is fixedly connected to it through a preset expansion bolt 23 arranged on the receiving well portal wall 21, and a water stop piece 32 is used for water stop between them.

[0051] An annular angle steel 11 is fixed on the inner wall of the rear end of the rear steel sleeve unit 102. The annular angle steel 11 is an annular structure with an "L"-shaped cross-section, and its periphery is connected to an arc-shaped side soil retaining plate strip 12 through bolts 25. An arc-shaped side soil retaining plate strip 12 is arranged at a position near the rear end of the rear unit steel sleeve 102. A transition space is formed between the arc-shaped side soil retaining plate strip 12 and the strengthening cover plate 13. On the one hand, it reduces the leakage pressure between the strengthening cover plate 13 and the steel sleeve body. In addition, during demolition, rapid pressure relief can be carried out between the retaining wall plate and the cover plate first, which is beneficial to demolishing the strengthening ring beam, and then the retaining plate can be safely demolished from top to bottom and the slurry can be removed, reducing the construction period; in the past, the crown cover plate could not be directly disassembled. Because the residual slurry height was large and the soil pressure was large, safety hazards were prone to occur during the demolition of the strengthening cover plate, resulting in a relatively long demolition process.

[0052] The strengthening cover plate 13 is connected to the rear end face of the rear steel sleeve unit (102) through flange bolts 26, and a water stop rubber sheet 14 is arranged between them; a steel wedge block 28 for the steel sleeve body to be in tight contact with the elastic water stop ring 6 is arranged between the strengthening cover plate 13 and the reaction frame 15; an anchor 29 for anchoring with the receiving well bottom plate 27 is installed on the base 16 of the steel sleeve body, and the base 16 is a reinforced concrete pedestal or a pedestal made of section steel.

[0053] A construction method for a shield receiving a semi-open steel sleeve mechanism comprises the following steps:

[0054] Step 1: The tail of the front semicircular steel cylinder 3 with the base is connected to the front of the rear semicircular steel cylinder 4 with the base through flange bolts 19, and rubber sheets are provided between the connections to stop water;

[0055] Step 2: the front semicircular steel cylinder 1 is covered on the front semicircular steel cylinder 3 with a base, and the rear semicircular steel cylinder 2 is covered on the rear semicircular steel cylinder 4 with a base, and the flange bolts 20 are used to connect them. Then, the front and rear semicircular steel cylinders are connected with flange bolts 19, and rubber sheets are set between each connection to stop water, so as to form a receiving steel sleeve body;

[0056] Step 3: The annular steel groove 5 is welded to the annular steel plate 22 embedded in the concrete of the receiving well hole door wall 21 in sections to seal and firmly seal the annular steel groove 5. Then, each sectioned annular steel groove 5 is welded to form an annular groove, and an elastic water stop ring 6 is embedded inside.

[0057] Step 4: the short steel sleeve 7 is penetrated through the flange and the expansion bolt 23 preset in the concrete of the receiving well hole door wall 21, and is tightened with a nut, with a water-stop rubber sheet 32 ​​arranged in between;

[0058] Step 5: The outer ring channel steel 9 is welded to the inner side of the end of the short steel sleeve 7, and the inner ring channel steel 8 is welded to the outer wall of the front unit steel sleeve 101, and the cavity formed between the two is embedded with the rubber bladder ring 10;

[0059] Step 6: The front end of the front unit steel sleeve is inserted into the annular steel groove 5, and the elastic water stop ring 6 in the annular steel groove 5 is pressed tightly. The measuring axis meets the requirements of the design and construction plan;

[0060] Step 7, applying pressure to the rubber bag ring 10 through the mouth 24 to inject mud or inflate it to stop water;

[0061] Step 8, the annular angle steel 11 is welded to the inner wall of the rear unit steel sleeve 102 close to the rear end;

[0062] Step nine, the bolts 25 on the annular angle steel 11 are put on the circular holes of the arc-shaped edge retaining plate strips 12 and tightened with nuts; arc-shaped grooves are arranged between the arc-shaped edge retaining plate strips 12, and rubber membranes are used to stop water between the seams, and the whole is assembled into a circular jigsaw puzzle;

[0063] Step 10: The reinforcing cover plate 13 is covered on the tail of the rear unit steel sleeve 102 and is firmly connected with the flange bolts 26, and a circular thin waterproof rubber sheet 14 is arranged between them;

[0064] Step 11: The reaction frame 15 is installed after the reinforcing cover plate 13 and is firmly fixed to the receiving well bottom plate 27;

[0065] Step 12: The steel wedge 28 is embedded between the reinforcing cover plate 13 and the reaction frame 15, so that the front end surface of the front unit steel sleeve 101 embedded in the annular steel groove 5 presses the elastic water stop ring 6, causing it to produce a certain elastic compression deformation;

[0066] Step 13: the base 16 is anchored to the receiving well bottom plate 27 through the ground anchor 29;

[0067] Step 14: The large grouting nozzle 17 and the small grouting nozzle 30 are connected to an external mud pump to perform pressure grouting, and the pressure is maintained for a certain period of time to ensure good sealing and no leakage, so as to prepare to receive the shield machine;

[0068] Step 15, after the shield machine 31 enters the receiving steel sleeve or when the mud pressure is too high, the slurry discharge pipe 18 is gradually opened to discharge the mud and relieve the pressure;

[0069] Step 16, after the reaction frame 15 is removed, the reinforcing cover plate 13 is opened to remove the mud;

[0070] Step seventeen, the arc-shaped edge retaining strips 12 are removed one by one from top to bottom, the mud is cleared, and the receiving is completed.

[0071] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. A shield receiving semi-open steel sleeve mechanism, characterized in that: It includes a steel sleeve body for a segmental shield machine (31), a short steel sleeve (7), arc-shaped side soil retaining strip (12), a reinforcing cover plate (13), a reaction frame (15), a large grouting nozzle (17), a small grouting nozzle (30), and a slurry discharge nozzle (18). The steel sleeve body is composed of a front unit steel sleeve (101) and a rear unit steel sleeve (102) connected in sequence along its axial direction. The front unit steel sleeve (101) and the rear unit steel sleeve (102) are respectively composed of a front semi-circular steel cylinder (1), a front semi-circular steel cylinder with a base (3), a rear semi-circular steel cylinder (2), and a rear semi-circular steel cylinder with a base (4) combined along their circumferential directions. The front end face of the front unit steel sleeve (101) is semi-openly connected to the portal wall (21) of the receiving well. The short steel sleeve (7) is arranged outside the front unit steel sleeve (101). The front end of the short steel sleeve (7) is connected to the portal wall (21) of the receiving well, and the inner wall of its rear end is connected to the outer wall of the front unit steel sleeve (101) through a connection mechanism. The reinforcing cover plate (13) is fixedly connected to the rear end of the rear unit steel sleeve (102). A reaction frame support (15) is installed behind the reinforcing cover plate (13), and the reaction frame support (15) is fixedly connected to the bottom plate (27) of the receiving well. The large grouting nozzles (17) are respectively arranged above the middle parts of the front unit steel sleeve (101) and the rear unit steel sleeve (102). The small grouting nozzle (30) is located above the tail of the rear unit steel sleeve (102). The two slurry discharge nozzles (18) are respectively located below the rear unit steel sleeve (102) and below the reinforcing cover plate (13). The connection mechanism includes an outer ring channel steel (9) fixed to the inner wall of the rear end of the short steel sleeve (7), an inner ring channel steel (8) fixed to the outer wall of the front end of the front unit steel sleeve (101), and a rubber bladder ring (10). The inner ring channel steel (8) and the outer ring channel steel (9) are annular structures with a "concave" cross-section, and a cavity for placing the rubber bladder ring (10) is formed between them. The rubber bladder ring (10) is a water-stop rubber bladder ring that can be inflated with air or slurry, and a nozzle (24) for inflating with air or slurry and communicating with the outside is provided on its side wall. A ring angle steel (11) is fixed to the inner wall of the rear end of the rear unit steel sleeve (102). The ring angle steel (11) is an annular structure with an "L" cross-section, and its periphery is connected to the arc-shaped side soil retaining strip (12) through bolts (25).

2. A shield receiving semi-open steel sleeve mechanism according to claim 1, characterized in that: The front end face of the front unit steel sleeve (101) is semi-openly connected to the portal wall (21) of the receiving well through a ring steel groove (5). An embedded ring steel plate (22) for fixedly connecting with the ring steel groove (5) is provided in the portal wall (21) of the receiving well. The ring steel groove (5) is an annular structure with a "C" cross-section, and an elastic water-stop ring (6) is provided inside it. The front end face of the front unit steel sleeve (101) is embedded in the ring steel groove (5) and tightly contacts the elastic water-stop ring (6) to form an embedded contact connection.

3. A shield receiving semi-open steel sleeve mechanism according to claim 2, characterized in that: The elastic water stop ring (6) is an arc-shaped water stop rubber strip with a certain thickness and width or an arc-shaped waterproof geotextile strip bag with mud poured inside.

4. A shield receiving semi-open steel sleeve mechanism according to claim 3, characterized in that: The front end flange of the short steel sleeve (7) is fixedly connected to the receiving well hole door wall (21) via a preset expansion bolt (23) arranged on the receiving well hole door wall (21), with a water-stop rubber sheet arranged therebetween.

5. A shield receiving semi-open steel sleeve mechanism according to claim 4, characterized in that: The reinforcing cover plate (13) is connected to the rear end face of the rear unit steel sleeve (102) via flange bolts (26), and a water-stop rubber sheet is arranged between the two; a steel wedge block (28) is arranged between the reinforcing cover plate (13) and the reaction frame (15) for tightening the steel sleeve body and the elastic water-stop ring (6); and a ground anchor (29) is installed on the base (16) of the steel sleeve body for anchoring to the bottom plate (27) of the receiving well.

6. A construction method for a shield receiving a semi-open steel sleeve mechanism according to claim 5, characterized in that: The steps include: Step 1: The tail of the front semicircular steel cylinder (3) with a base is connected to the front of the rear semicircular steel cylinder (4) with a base by means of flange bolts, and rubber sheets are provided between the connections to stop water; Step 2: the front semicircular steel cylinder (1) is covered on the front semicircular steel cylinder (3) with a base, and the rear semicircular steel cylinder (2) is covered on the rear semicircular steel cylinder (4) with a base, and they are connected by flange bolts. Then, the front and rear semicircular steel cylinders are connected by flange bolts, and rubber sheets are provided between the connections to stop water, so as to form a receiving steel sleeve body; Step 3, the annular steel groove (5) and the annular steel plate (22) embedded in the concrete of the receiving well hole door wall (21) are welded in sections to seal and firmly, and then each section of the annular steel groove (5) is welded to form an annular groove, and an elastic water stop ring (6) is embedded inside; Step 4: the short steel sleeve (7) is penetrated through the expansion bolts (23) preset in the concrete of the flange and the receiving well hole door wall (21), and is tightened with nuts, with a water-stop rubber sheet arranged in between; Step 5: the outer ring channel steel (9) is welded to the inner side of the end of the short steel sleeve (7), and the inner ring channel steel (8) is welded to the outer wall of the front unit steel sleeve (101), and the cavity formed between the two is embedded in the rubber bag ring (10); Step 6: The front end of the front unit steel sleeve is inserted into the annular steel groove (5), and the elastic water stop ring (6) in the annular steel groove (5) is pressed tightly, and the measurement axis meets the requirements of the design and construction plan; Step 7, applying pressure to the rubber bag ring (10) through the mouth (24) to inject mud or inflate it to stop water; Step eight, the annular angle steel (11) is welded to the inner wall of the rear unit steel sleeve (102) close to the rear end; Step nine, the bolts (25) on the annular angle steel (11) are put on the circular holes of the arc-shaped edge retaining plate strips (12) and tightened with nuts; arc-shaped grooves are arranged between the arc-shaped edge retaining plate strips (12), and rubber membranes are used to stop water between the seams, and the whole is assembled into a circular panel; Step ten, the reinforcing cover plate (13) is covered on the tail of the rear unit steel sleeve (102), and is firmly connected with flange bolts (26), and a circular thin waterproof rubber sheet is arranged between them; Step 11: the reaction frame (15) is installed after the reinforcing cover plate (13) and is firmly fixed to the receiving well bottom plate (27); Step 12: the steel wedge (28) is embedded between the reinforcing cover plate (13) and the reaction frame (15), so that the front end surface of the front unit steel sleeve (101) presses the elastic water stop ring (6) in the annular steel groove (5) to produce a certain elastic compression deformation; Step 13, the base (16) is anchored to the receiving well bottom plate (27) via a ground anchor (29); Step 14: the large grouting pipe opening (17) and the small grouting pipe opening (30) are connected to an external grouting pump to perform pressure grouting, and the pressure is maintained for a certain period of time to ensure good sealing and no leakage, so as to prepare to receive the shield machine; Step 15, after the shield machine (31) enters the receiving steel sleeve or when the mud pressure is too high, the slurry discharge pipe opening (18) is gradually opened to discharge the mud and relieve the pressure; Step 16, after the reaction frame (15) is removed, the reinforcing cover plate (13) is opened to remove the mud; Step 17: The arc-shaped retaining strips (12) are removed one by one from top to bottom, and the mud is removed to complete the receiving.

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