CN108221955B - A prefabricated underground diaphragm wall, spreader and construction method that can be recycled as a whole - Google Patents

Abstract

The invention discloses a prefabricated underground diaphragm wall capable of being recycled integrally, a lifting appliance and a construction method, wherein the diaphragm wall comprises a concrete cushion layer, an arch slab beam base and an assembled diaphragm wall which are sequentially arranged from bottom to top; the assembled continuous wall is formed by assembling a plurality of arch plate beam members, through long round steel and rubber steel plate bases; the arch plate beam members have different length types, the long arch plate beam members and the short arch plate beam members are transversely and longitudinally staggered, and the upper arch plate beam member and the lower arch plate beam member in the excavation depth are connected through arc segment bolts. The invention utilizes the structure assembled by arched beam members to form the continuous wall, and has the advantages of tight connection, good overall performance and easy control of wall deformation; the continuous wall can be integrally lifted out according to specific conditions and recycled, so that the resources are saved, and the method is economical and environment-friendly.

Description

A prefabricated underground diaphragm wall, spreader and construction method that can be recycled as a whole

technical field

The invention relates to an underground building construction device and a construction method, in particular to a prefabricated underground continuous wall, a spreader and a construction method that can be used as a whole and recycled.

Background technique

The underground diaphragm wall is a kind of excavation construction process. Its construction method is to excavate a narrow and long deep groove along the periphery of the deep excavation project with the excavation equipment under the condition of mud retaining wall, and pour into the groove after cleaning the groove Appropriate materials are used to form a wall, and then several sections of the wall are connected into a whole, that is, a continuous underground wall, which is used as a water interception, seepage prevention, load bearing, and water retaining structure. The specific construction process is shown in Figure 1. The construction of this kind of diaphragm wall has the following characteristics: small working vibration, low noise, especially suitable for urban rail construction, and can be constructed at night; using reinforced concrete or plain concrete, the wall has strong rigidity, strength and overall stability, and can be used Reduce the deformation and settlement of structures and foundations; it can adapt to various excavated strata, except for lava geology, and can be safely constructed near weak strata and important buildings; especially the construction near or close to underground pipelines, settlement and displacement changes Relatively easy to control; using bentonite mud wall construction, mainly used to seal and protect the tank wall, can be constructed safely and reliably, and the surrounding foundation and foundation will not produce excessive settlement.

However, the defects of this traditional cast-in-place monolithic underground diaphragm wall are also relatively prominent, mainly in the following aspects: 1. The construction process of the underground diaphragm wall is complicated, the construction period is long, and the cost is very expensive; 2. The underground diaphragm wall is used as a temporary retaining soil 1. The anti-seepage wall cannot be recycled when used, resulting in unnecessary waste; 3. The quality of the joints at the joints of the underground continuous wall is difficult to control, which is a weak link in the construction; and the wall is inclined, and the surface is bulged and exposed Problems such as ribs and leakage need further processing, which not only wastes costs, but also has a great impact on the construction of the main structure in the later stage; 5. Construction technology, selection of groove forming machines, underground groove construction, joint treatment, pouring concrete, mud Every link such as treatment needs to be properly handled, and no omissions can be left, otherwise it will have a serious impact on the quality of the wall; 6. During construction, the groundwater level rises rapidly, and the liquid level of the retaining mud drops rapidly. If the nature of the mud is problematic or deteriorated, Coupled with improper construction management, or the existence of weak and loose sandy interlayers, the tank wall is prone to collapse, ranging from overcubic concrete walls and out-of-bounds structural dimensions, to serious ground subsidence or even collapse, causing damage to adjacent buildings and underground pipelines 7. It is difficult to arrange detection devices for accurate detection of the soil layer on the facing soil surface, and the existing detection methods such as road surface settlement and deformation are relatively lagging behind.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a prefabricated underground diaphragm wall, a spreader and a construction method that can be recycled as a whole, so that the integrity of the diaphragm wall is good, the deformation of the wall is easy to control, and the phenomenon of concrete bypass is not easy to occur, and it also avoids It eliminates the convex belly phenomenon of reinforced concrete wall panels caused by the soil collapse in the groove. At the same time, it has low requirements for mud, small amount of concrete work on site, short construction period, simple construction process, and can be used repeatedly, reducing costs and saving resources.

The present invention is a prefabricated underground continuous wall that can be used as a whole, including a concrete cushion, an arched plate beam base and an assembled continuous wall arranged sequentially from bottom to top; the assembled continuous wall is composed of several arched plate beam members, long round steel and rubber Assembled steel plate base;

The arched plate beam member includes an arched plate, a left vertical beam and a right vertical beam. The upper end surface of the vertical beam, the lower end surface of the arched plate is recessed into the lower end surface of the left vertical beam and the right vertical beam, the cross section of the left vertical beam is concave, the cross section of the right vertical beam is convex, and the groove of the left vertical beam Cooperate with the protrusion size of the right vertical beam, and match the protrusion height of the upper end of the arched plate with the recessed depth of the lower end of the arched plate. Both the left vertical beam and the right vertical beam are symmetrically opened with two thin holes that allow the long round steel to pass through. The wall steel pipe through hole; the rubber steel plate base includes a convex base and a concave base, the surface size of the concave base is consistent with the cross-sectional size of the left vertical beam, the surface size of the convex base is consistent with the cross-sectional size of the right vertical beam, The steel plate base is made of several thick steel plates and thick rubber pads interlaced and adhered. Two through holes are symmetrically opened on the concave and convex bases to allow the long round steel to pass through, and the concave and convex bases A number of bolt holes are evenly distributed on the rubber plate base. After applying a certain pre-tightening force on the upper end of the rubber steel plate base, use high-strength bolts to pass through the bolt holes and tighten them. The large head of the high-strength bolts is welded with L-shaped steel bars, and the other end of the L-shaped steel bars is in the arch. When the plate girder is manufactured, it is anchored into the bottom of the left vertical beam and the right vertical beam, and the lower ends are guaranteed to be flush;

The arched plate beam members have different length models, the long arched plate beam members and the short arched plate beam members are arranged staggered horizontally and vertically, and the upper and lower arched plate beam members within the excavation depth are connected by arc segment bolts;

The base of the arched plate beam is composed of several cuboid reinforced concrete structures. The first layer of the arched plate beam member set on the base of the arched plate beam needs to pre-cast round steel in the arched plate beam member, and then connect the full length round steel according to the preset method Finally, the arch plate beam members with the lower end anchored into the rubber steel plate base are hoisted into the groove through the through-hole of the thin-walled steel pipe in turn and assembled into a continuous wall.

Due to its arched structure, the arched plate of the arched plate beam will produce a certain amount of back tension on the left vertical beam and the right vertical beam on both sides, and the weight of the component itself strengthens the tightness and stability of the overall wall connection; The arched plate beam members are arranged alternately by long arched plate beam members and short arched plate beam members to form a continuous wall to improve the shear resistance of the continuous wall; Components, which can ensure the overall installation accuracy of the assembled continuous wall and improve the overall strength and stability; the rubber steel plate base between the upper and lower components is compressed and deformed by applying a certain prestress before the connection, and then the high-strength bolts are tightened. The strain generated after splicing is eliminated, and the rubber steel plate base can relieve the stress concentration of the connecting parts and allow small deformation, so that the force of the long round steel is more coordinated; the arc-shaped segment bolts can limit the deformation of the overall component of the continuous wall after coordination. deformation during digging.

In order to further improve the waterproof performance and shear resistance of the continuous wall, the middle part of the arched plate, the middle part of the outer side of the left vertical beam, and the outer middle part of the right vertical beam are all provided with card slots, and the rubber water-stop sheets are covered in the card slots.

Further, a detection device is installed in the arched plate arch, and the detection device includes a strain gauge, a vibration sensor, a displacement sensor, a liquid level sensor and a temperature sensor.

The above-mentioned detection device can monitor changes in soil pressure, settlement, deformation and water conservancy on the facing soil surface, so as to achieve advance prediction and effective response.

Further, the long round steel is formed by connecting several round steels, and every two round steels are connected by thread connection or pin insertion. Different round steel connection methods can be selected according to different construction requirements. When the whole round steel needs to be hoisted out and disassembled, the two round steels should be connected by threads; The round steel can adopt the pin shaft insertion type.

Further, before assembling, the upper end of each arch beam member is covered with a rubber protective cover, and a rubber protective cover steel plate is provided inside the rubber protective cover, and each rubber protective cover steel plate has a hoisting ring hole. By putting the rubber protective sleeve on the splicing seam of the arch-slab beam members, it can not only have a certain protective effect during transportation, but also prevent the inclusion of debris such as sediment during the splicing process.

A kind of special spreader that can recycle the prefabricated underground diaphragm wall as a whole, it is used for the prefabricated underground diaphragm wall that can be recycled as a whole, including triangular suspender, flat suspender and two sets of spreaders, and the arched plate is opened for The upper hoisting bolt hole for installing the upper hoisting bolt and the lower hoisting bolt hole for installing the lower hoisting bolt have a certain distance between the upper and lower hoisting bolt holes. I includes steel twisted rope I and rope buckle I, the connection position of rope buckle I is higher than the ground level, and the flat suspender and spreader II are connected with the lower lifting bolt, and the spreader II includes steel twisted rope II, shackle and rope Buckle II, the shackle connects the steel strand rope II to the lower lifting bolt, and the rope buckle II can be fixed at any position of the steel strand rope II.

The hoisting of the components can be safely and efficiently completed without damaging the structure through the hoisting bolts; through the reserved steel strands, the prefabricated underground diaphragm wall can be partly or All are hoisted out, and then recycled; the upper and lower hoisting bolts are staggered by a certain distance, and the hoisting stability is guaranteed by means of the same straight line component force offsetting each other and the upper triangular boom.

A construction method for integrally recyclable prefabricated underground diaphragm walls, used for integrally recyclable prefabricated underground diaphragm walls as described, the steps are as follows:

In the first step, when prefabricating the arched plate beam components, the pipelines are pre-embedded in the arched plate beam, and the detection device is installed at the designated position of the arched plate beam and marked;

The second step is to enter the construction site to form a trench under the protection of the mud retaining wall, dig to a certain depth higher than the design elevation to clear the bottom, and then pour concrete through the conduit to the design bottom elevation as a concrete cushion;

The third step is to hoist the base of the arch slab beam to the design elevation after the initial setting of the concrete, level the concrete on the cushion layer, and then lift it out. The steel strand is reserved on the hoisting ring hole of the rubber protective sleeve steel plate at the upper end of the beam member;

In the fourth step, the round steel is pre-cast in the bottom arch beam member, and the arch beam member is hoisted horizontally to the designated position directly above by two cranes, and then the shackle on the lower lifting device II is removed, and the triangular suspender is used to And hanger 1 vertically lowers the arch plate beam member to the designated position;

The fifth step is to connect the full-length round steel together in sequence according to the design method during the lowering process of the bottom arch-slab beam member until the top elevation of the full-length round steel is higher than the mud surface;

The sixth step is to hoist the next arched plate beam member according to the hoisting method of the fourth step so that the thin-walled steel pipe holes reserved for the arched plate beam member pass through four long round steel bars. When the arched plate beam member is lowered close to the joint When hoisting the rubber protective cover of the last arched plate girder and then splicing it in place sequentially; lifting and splicing are carried out alternately according to the long arched plate girder components and the short arched plate girder components;

The seventh step is to construct on both sides in turn. The upper end of the long round steel is anchored into the upper concrete support, and the overall stability is ensured through the upper and lower connections;

In the eighth step, after the construction of the three underground diaphragm walls, joint boxes are placed on both sides, and then cement slurry is injected under high pressure into the gaps with the soil on both sides, so that the soil on both sides is evenly stressed and the settlement of the underground diaphragm walls is reduced; etc. After the cement slurry reaches a certain strength, construct the underground diaphragm walls on both sides; or place joint boxes on both sides during the construction of the first section, while hoisting the arched plate beam components, while injecting high-pressure cement slurry at a depth lower than the elevation of the arched plate beam components;

The ninth step is to connect the upper and lower arch plate beam members with arc-shaped segment bolts at the joint of the arch plate beam after excavation, and then erect steel supports at the joint joint of the arch plate beam to ensure stability and form the plate beam Column force system;

The tenth step, the construction of the main structure is completed, and after the strength and settlement are stable, the arch slab beam at the corner is removed first, and the arch slab beam is hoisted out at one time through the reserved steel strand, with the help of hoisting bolts and long round steel. Inject cement slurry in time for the demolition work of the underground diaphragm wall, and continue the demolition work of the adjacent segment of the underground diaphragm wall after the cement slurry reaches a certain strength.

Further, the cement slurry is made of a certain proportion of water, cement, fly ash, clay, construction waste material powder or sand, and admixtures.

The invention solves the problems of the existing cast-in-place underground diaphragm wall, such as high cost, long construction period, difficulty in controlling the construction quality of the underground diaphragm wall, and many hidden dangers of the wall body after excavation. The diaphragm wall is composed of a structure assembled with arched beam members , tight connection, good overall performance, and easy control of wall deformation; the continuous wall can also be hoisted out as a whole according to specific conditions, and then reused repeatedly, saving resources, economical and environmentally friendly; at the same time, it can detect the soil-facing surface more safely, conveniently and accurately Condition.

Description of drawings

Fig. 1 is a flow chart of the construction process of an integral underground diaphragm wall in the prior art.

Fig. 2 is a schematic diagram of the structure of the present invention.

Fig. 3 is a schematic diagram of the structure of the concrete cushion and the base of the arch plate beam in the present invention.

Fig. 4 is a structural schematic diagram of the arched plate beam member in the present invention.

Fig. 5 is a schematic diagram of a three-dimensional structure of a convex-shaped base in the present invention.

Fig. 6 is a schematic diagram of the three-dimensional structure of the concave-shaped base of the present invention.

Fig. 7 is a schematic diagram of the structure of the high-strength bolt in the present invention.

Fig. 8 is a construction process drawing of the arch plate girder member, the full-length round steel and the rubber steel plate base in the present invention.

Fig. 9 is a schematic diagram of the structure of the rubber protective sleeve in the present invention.

Fig. 10 is a schematic structural view of the rubber protective sheath steel plate arranged in Fig. 9 .

Fig. 11 is a schematic diagram of one of the round steel structures in the present invention.

Fig. 12 is a schematic diagram of another round steel structure in the present invention.

Fig. 13 is a schematic diagram of the structure of a triangular suspender.

Fig. 14 is a schematic diagram of the structure of the hanger 1.

Fig. 15 is a structural schematic diagram of the spreader II.

Fig. 16 is a structural schematic diagram of hoisting and leveling the base of the arched plate beam.

In the figure: 1. Concrete cushion; 2. Base of arched plate beam; 3. Assembled continuous wall; 4. Arched plate beam member; 41. Arched plate; 42. Left vertical beam; 43. Right vertical beam; 44. Upper Lifting bolt hole; 45, lower lifting bolt hole; 5, long round bar; 51, round bar; 6, rubber plate base; 61, convex base; 62, concave base; 63, bolt hole; 64, high-strength bolt ;65, L-shaped steel bar; 8, hanging rubber waterstop; 9, rubber protective cover; 91, rubber protective cover steel plate; 92, hoisting ring hole; 10, triangular suspension rod; 11, upper lifting bolt; Bolt; 13, spreader I; 13-1, steel twisted rope I; 13-2, rope buckle I; 14-1, steel twisted rope II; 14-2, shackle; 14-3, rope buckle II.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 2 to 8, a prefabricated underground continuous wall that can be recycled as a whole includes a concrete cushion 1, an arch beam base 2 and an assembled continuous wall 3 that are sequentially arranged from bottom to top; wherein the assembled continuous wall 3 is made of Several arch beam members 4, long round steel 5 and rubber steel plate base 6 are assembled.

The arched plate beam member 4 comprises an arched plate 41, a left vertical beam 42 and a right vertical beam 43, the two ends of the arched plate 41 are respectively connected in the middle of the left vertical beam 42 and the right vertical beam 43, and the upper end surface of the arched plate 41 is convex. Out the upper end faces of the left vertical beam 42 and the right vertical beam 43, the lower end surface of the arched plate 41 is recessed into the lower end faces of the left vertical beam 42 and the right vertical beam 43, the cross section of the left vertical beam 42 is concave, and the right vertical beam 43 The cross-section is convex, and the groove of the left vertical beam 42 matches the protrusion size of the right vertical beam 43. The protruding height of the upper end of the arched plate 41 matches the concave depth of the lower end of the arched plate 41. The left vertical beam 42 All symmetrically have two thin-walled steel pipe through-holes that allow long round steel 5 to pass through on the right vertical beam 43; The cross-sectional size of the left vertical beam 42 is consistent, and the surface size of the convex base 61 is consistent with the cross-sectional size of the right vertical beam 43. The rubber steel plate base 6 is formed by overlapping and adhering several thick steel plates and thick rubber pads. The concave base 62 and The convex base 61 is symmetrically opened with two through holes that allow the long round steel to pass through, and a number of bolt holes 63 are evenly distributed on the concave base and the convex base, and a certain pre-tightening force is applied to the upper end of the rubber steel plate base. Finally, high-strength bolts 64 are used to pass through the bolt holes and tightened. L-shaped steel bars 65 are welded on the large ends of high-strength bolts 64. The bottom of the beam 43, and ensure that the lower end is flush.

The arched plate beam members 4 have different length models, the long arched plate beam members and the short arched plate beam members are arranged alternately in the horizontal and vertical directions, and the upper and lower arched plate beam members within the excavation depth are connected by arc segment bolts.

The base of the arch beam 2 is composed of several cuboid reinforced concrete structures. The first layer of the arch beam member 4 set on the base of the arch beam 2 needs to pre-cast round steel 51 in the arch beam member 4, and then according to the preset After connecting the long round steel 5 in the same way, the arch plate beam member whose lower end is anchored into the rubber steel plate base 6 passes through the through hole of the thin-walled steel pipe to hoist it into the groove and assemble it into a continuous wall.

Due to its arched structure, the arched plate 41 of the arched plate beam member will produce a certain amount of back tension on the left vertical beam 42 and the right vertical beam 43 on both sides, and the weight of the component itself strengthens the tightness and tightness of the overall wall connection. Stability; the arched plate beam member 4 is arranged alternately by the long arched plate beam member and the short arched plate beam member to form a continuous wall, which improves the shear resistance of the continuous wall; on the arched plate beam base 2, the long round steel 5 is spliced in advance Install the arch plate beam member 4 afterward, which can ensure the overall installation accuracy of the assembled continuous wall 3 and improve the overall strength and stability; the rubber steel plate base 6 between the upper and lower members generates a certain compression deformation by applying a certain prestress before connection Then tighten the high-strength bolts 64, thereby effectively reducing the strain generated after splicing, and the rubber steel plate base 6 can relieve the stress concentration of the connector and allow small deformation, so that the force of the long round steel 5 is more coordinated; the arc segment Bolts can limit the deformation of the diaphragm wall's overall member deformation coordination during excavation.

As shown in Figure 8, in order to further improve the waterproof performance and shear resistance of the continuous wall, the middle part of the arched plate 41, the middle part of the outer side of the left vertical beam 42, and the outer middle part of the right vertical beam 43 are all provided with card slots, and the card slots include Cover rubber waterstop 8.

Further, a detection device is installed in the arch of the arched plate 41, and the detection device includes a strain gauge, a vibration sensor, a displacement sensor, a liquid level sensor and a temperature sensor. The above-mentioned detection device can monitor changes in soil pressure, settlement, deformation and water conservancy on the facing soil surface, so as to achieve advance prediction and effective response.

As shown in Fig. 11 and Fig. 12, the long round steel 5 is formed by connecting several round steels 51, and every two round steels 51 are connected by thread connection or pin insertion. Different round steel connection methods can be selected according to different construction requirements. When the whole round steel needs to be hoisted out and disassembled, the two round steels should be connected by threads; The round steel can adopt the pin shaft insertion type.

As shown in Fig. 9 and Fig. 10, before assembling, the upper end of each arch beam member 4 is covered with a rubber protective cover 9, and the rubber protective cover 9 is provided with a rubber protective cover steel plate 91, and each steel plate has a hoisting ring hole 92 . By putting the rubber protective sleeve on the splicing seam of the arch-slab beam members, it can not only have a certain protective effect during transportation, but also prevent the inclusion of debris such as sediment during the splicing process.

As shown in Figures 13 to 15, a special spreader that can be used as a whole to recycle the prefabricated underground diaphragm wall includes a triangular suspender 10, a flat suspender not shown in the figure and two sets of suspenders. The upper hoisting bolt hole 44 of the upper hoisting bolt 11 is installed, and the lower hoisting bolt hole 45 for installing the lower hoisting bolt 12 has a certain distance between the upper and lower hoisting bolt holes. Connected, the spreader I13 includes a steel strand I13-1 and a rope buckle I13-2, the connection position of the rope buckle I13-2 is higher than the ground level, the flat boom and the spreader II are connected with the lower lifting bolt 12, and the spreader II includes Steel strand rope II14-1, shackle 14-2 and rope buckle II14-3, shackle 14-2 connects the steel strand rope II14-1 to the lower lifting bolt 12, and the rope buckle II14-3 can be used on the steel strand rope II14- 1 is fixed at any position.

The hoisting of the components can be safely and efficiently completed without damaging the structure through the hoisting bolts; through the reserved steel strands, the prefabricated underground diaphragm wall can be partly or All are hoisted out and recycled for reuse.

As shown in Fig. 2 to Fig. 16, a construction method of prefabricated underground continuous wall that can be recycled as a whole, the steps are as follows:

In the first step, when prefabricating the arched plate beam member 4, the pipeline is pre-embedded in the arched plate beam, and the detection device is installed on the designated position of the arched plate beam and marked;

The second step is to enter the construction site and form a trench under the protection of the mud retaining wall, dig to a certain depth higher than the design level to clear the bottom, and then pour concrete through the conduit to the design bottom level as the concrete cushion 1;

The third step is to hoist the arched plate beam base 2 to the design elevation after the initial setting of the concrete, level the cushion concrete, and then lift it out. Steel strands are reserved on the rubber protective sleeve steel plate 91 hoisting ring hole 92 at the upper end of the arch plate beam member 4;

In the fourth step, the round steel 51 is pre-cast in the bottom arch beam member 4, and the arch beam member 4 is hoisted horizontally to the designated position by two cranes, and then the shackle 14- 2. Use the triangular suspender 10 and the sling I13 to vertically lower the arched plate beam member 4 to a designated position;

The fifth step is to connect the full-length round steel 5 together according to the design method in the process of lowering the bottom arch plate beam member 4 until the top elevation of the full-length round steel is higher than the mud surface;

The sixth step is to hoist the next arched plate beam member 4 according to the hoisting method of the fourth step so that the thin-walled steel pipe through holes reserved by the arched plate beam member 4 pass through four long round steel bars 5. When the arched plate beam member 4 is lowered to the At the splicing seam, first lift the rubber protective cover 9 of the last arched plate beam and then splice it in place sequentially; the lifting and splicing are carried out alternately according to the long arched plate beam member and the short arched plate beam member;

The seventh step is to construct on both sides in turn. The upper end of the long round steel 5 is anchored into the upper concrete support, and the overall stability is ensured through the upper and lower connections;

In the eighth step, after the construction of the three underground diaphragm walls, joint boxes are placed on both sides, and then cement slurry is injected under high pressure into the gaps with the soil on both sides, so that the soil on both sides is evenly stressed and the settlement of the underground diaphragm walls is reduced; etc. After the cement slurry reaches a certain strength, construct the underground diaphragm walls on both sides; or place joint boxes on both sides during the first construction, and while hoisting the arch beam member 4, inject cement at a depth lower than the elevation of the arch beam member 4 under high pressure. slurry;

The ninth step is to connect the upper and lower arch plate beam members with arc-shaped segment bolts at the joint of the arch plate beam after excavation, and then erect steel supports at the joint joint of the arch plate beam to ensure stability and form the plate beam Column force system;

The tenth step, the construction of the main structure is completed, and after the strength and settlement are stable, the arch slab beam at the corner is removed first, and the arch slab beam is hoisted out at one time through the reserved steel strand, with the help of hoisting bolts and long round steel. Inject cement slurry in time for the demolition work of the underground diaphragm wall, and continue the demolition work of the adjacent segment of the underground diaphragm wall after the cement slurry reaches a certain strength.

The cement slurry is made of a certain proportion of water, cement, fly ash, clay, construction waste material powder and admixture materials.

Claims (7)

1. The prefabricated underground diaphragm wall capable of being recycled integrally is characterized by comprising a concrete cushion layer (1), an arch beam base (2) and an assembled diaphragm wall (3) which are sequentially arranged from bottom to top; the assembled continuous wall (3) is formed by assembling a plurality of arch beam members (4), through long round steel (5) and a rubber steel plate base (6);

the arch bar beam component (4) comprises an arch bar (41), a left vertical beam (42) and a right vertical beam (43), two ends of the arch bar (41) are respectively connected between the left vertical beam (42) and the right vertical beam (43), the upper end face of the arch bar (41) protrudes out of the upper end faces of the left vertical beam (42) and the right vertical beam (43), the lower end face of the arch bar (41) is recessed into the lower end faces of the left vertical beam (42) and the right vertical beam (43), the cross section of the left vertical beam (42) is concave, the cross section of the right vertical beam (43) is convex, the concave groove of the left vertical beam (42) is matched with the convex size of the right vertical beam (43), the protruding height of the upper end of the arch bar (41) is matched with the recessed depth of the lower end of the arch bar (41), and two thin-wall steel tube through holes allowing a long round steel (5) to pass through are symmetrically arranged on the left vertical beam (42) and the right vertical beam (43);

the rubber steel plate base (6) comprises a convex base (61) and a concave base (62), the surface size of the concave base (62) is consistent with the cross section size of the left vertical beam (42), the surface size of the convex base (61) is consistent with the cross section size of the right vertical beam (43), the rubber steel plate base (6) is formed by overlapping and adhering a plurality of thick steel plates and thick rubber pads in a staggered mode, two through holes allowing long round steel to pass through are symmetrically formed in the concave base (62) and the convex base (61), a plurality of bolt holes (63) are uniformly distributed in the concave base and the convex base, a certain pretightening force is applied to the upper end of the rubber steel plate base, the rubber steel plate base is screwed up through the bolt holes by utilizing high-strength bolts (64), L-shaped steel bars (65) are welded on the big ends of the high-strength bolts (64), and the other ends of the L-shaped steel bars (65) are anchored into the bottoms of the left vertical beam (42) and the right vertical beam (43) when the arched plate beam member (4) is manufactured, and the lower end is guaranteed to be flush; the arch plate beam members (4) are of different length types, the long arch plate beam members and the short arch plate beam members are arranged transversely and longitudinally in a staggered mode, and the upper arch plate beam member and the lower arch plate beam member in the excavation depth are connected through arc duct piece bolts;

the arch plate beam base (2) is formed by a plurality of rectangular reinforced concrete structures, the first layer of arch plate beam members (4) arranged on the arch plate beam base (2) are required to be poured with round steel (51) in the arch plate beam members (4) in advance, then the arch plate beam members with the lower ends anchored into the rubber steel plate base (6) sequentially penetrate through thin-wall steel tube through holes, are hung into grooves and are assembled into a continuous wall after the long round steel (5) is connected in a preset mode.

2. The prefabricated underground diaphragm wall capable of being recycled integrally as claimed in claim 1, wherein the middle part of the arch plate (41), the middle part of the outer side of the left vertical beam (42) and the middle part of the outer side of the right vertical beam (43) are provided with clamping grooves, and the clamping grooves are internally coated with rubber water stop sheets (8).

3. Prefabricated underground diaphragm wall capable of being recycled integrally according to claim 2, characterized in that the arch-shaped plate (41) is internally provided with a detection device which comprises a strain gauge, a vibration sensor, a displacement sensor, a liquid level sensor and a temperature sensor.

4. A prefabricated underground diaphragm wall capable of being recycled integrally according to claim 3, characterized in that the through-length round steel (5) is formed by connecting a plurality of round steels (51), and every two round steels (51) are connected through threaded connection or pin shaft insertion.

5. A prefabricated underground diaphragm wall capable of being recycled integrally according to any one of claims 1 to 4, wherein before assembling, the upper end of each arch beam member (4) is sleeved with a rubber protecting sleeve (9), a rubber protecting sleeve steel plate (91) is arranged in the rubber protecting sleeve (9), and each rubber protecting sleeve steel plate (91) is provided with a lifting ring hole (92).

6. The special lifting appliance capable of being used for the prefabricated underground continuous wall in an integral recycling mode is characterized by comprising a triangular lifting rod (10), a flat lifting rod and two groups of lifting appliances, an upper lifting bolt hole (44) for installing an upper lifting bolt (11) and a lower lifting bolt hole (45) for installing a lower lifting bolt (12) are formed in an arch plate (41), a distance is reserved between the upper lifting bolt hole and the lower lifting bolt hole, the triangular lifting rod (10) and the lifting appliance I (13) are connected with the upper lifting bolt (11), the lifting appliance I (13) comprises a steel winch rope I (13-1) and a rope buckle I (13-2), the connecting position of the rope buckle I (13-2) is higher than the ground elevation, the flat lifting rod and the lifting appliance II are connected with the lower lifting bolt (12), the lifting appliance II comprises a steel winch rope II (14-1), a shackle (14-2) and a rope buckle II (14-3), the steel winch II (14-1) is connected with the lower lifting appliance II (14-2) at any position of the steel winch II (14-1).

7. A construction method of a prefabricated underground diaphragm wall capable of being recycled integrally, which is used for the prefabricated underground diaphragm wall capable of being recycled integrally according to any one of claims 1 to 5 and adopts the special lifting appliance according to claim 6, and is characterized by comprising the following steps: firstly, pre-burying pipelines in an arch plate beam when prefabricating the arch plate beam component (4), and installing a detection device at a specified position of the arch plate beam and marking;

secondly, entering a construction site to form a groove under the protection of a mud retaining wall, digging to a position which is more than a designed elevation by a certain depth for bottom cleaning, and pouring concrete to the designed bottom elevation through a guide pipe to serve as a concrete cushion layer (1);

thirdly, hanging the cushion layer concrete from the arch girder base (2) to the designed elevation after the initial setting of the concrete, and hanging the arch girder base (2) into a groove by a hanging bolt after the final setting of the concrete; meanwhile, reserving steel strands on a hoisting annular hole (92) of a rubber protective sleeve steel plate (91) at the upper end of the arch-bar beam component (4);

fourth, round steel (51) is poured in the bottommost arch beam component (4) in advance, the arch beam component (4) is firstly lifted horizontally to the position right above a designated position by utilizing two cranes, then a shackle (14-2) on an end lifting appliance II is detached, and the arch beam component (4) is vertically lowered to the designated position by utilizing a triangular suspender (10) and a lifting appliance I (13);

fifthly, sequentially connecting the through long round steel (5) together in a design mode in the process of lowering the bottommost arch plate beam component (4) until the top elevation of the through long round steel is higher than the mud surface;

a sixth step of hoisting the next arch-bar beam component (4) according to a fourth hoisting mode, so that the thin-wall steel pipe through holes reserved for the arch-bar beam component (4) penetrate through four through long round steels (5), and when the arch-bar beam component (4) is lowered to a position close to a splicing seam, the last arch-bar beam rubber protective sleeve (9) is hoisted and then spliced in sequence; hoisting and splicing are sequentially and alternately performed according to the long arch plate beam members and the short arch plate beam members;

seventhly, constructing to two sides in sequence, anchoring the upper end of the through long round steel (5) into an upper concrete support, and ensuring the overall stability through up-down connection;

eighth, after three underground continuous walls are constructed, joint boxes are arranged on the two sides of the underground continuous walls, cement slurry is injected into the gaps between the joint boxes and soil bodies on the two sides of the underground continuous walls at high pressure, so that the soil bodies on the two sides of the underground continuous walls are uniformly stressed, and the settlement of the underground continuous walls is reduced; after the cement slurry reaches a certain strength, constructing underground continuous walls on two sides; or placing joint boxes on two sides during construction of the first web, hoisting the arch-plate beam component (4), and injecting cement slurry with a depth lower than the elevation of the arch-plate beam component (4) at high pressure;

ninth, connecting an upper arch plate beam component and a lower arch plate beam component at the connecting joint of the arch plate beam by using arc segment bolts, and erecting a steel support at the connecting joint of the arch plate beam to ensure stability, thereby forming a plate beam column stress system;

and tenth, after the construction of the main body structure is completed and the strength and settlement are stabilized, the arch plate beam is firstly removed from the corner, the arch plate beam is lifted out once by means of a hoisting bolt and a through long round steel through reserved steel stranded wires, cement slurry is timely injected when the removal work of one underground continuous wall is completed, and the removal work of the underground continuous wall of the adjacent section is continued after the cement slurry reaches a certain strength.

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