TWI568909B - Pit - type foundation pit protection equipment and its construction method - Google Patents

Description

Well type foundation pit wall protection equipment and construction method thereof

The invention relates to a well foundation, in particular to a pit wall protection device and a construction method thereof.

In recent years, the construction of hollow-type deep foundations as bridges or building projects such as cat air-lifting cable foundation construction has often changed due to the structural changes of the strata, and there is currently no deep foundation construction method suitable for all stratigraphic structures. Achieve safe, economical and time-saving conditions.

According to the current design of bridges or building engineering, there are many types of foundations, such as shallow foundation design: independent footing, joint footing, continuous footing and raft foundation, while general deep foundation type has pile foundation and caisson foundation. In addition, the infrastructure is used to directly convey the load of the building to the deeper hard ground. In recent years, the continuous wall has been used as the pile user. We call it the wall pile, and also use the round tubular reinforced concrete. The structure is the basis of the load bearing and is called the well foundation. Therefore, the industry is engaged in geotechnical engineering experience, observation and practical verification, and then the construction of strata with special conditions, to completely different from the current basic construction method.

Well-based foundation construction methods currently used:

(1) Ring-shaped rib spray geotechnical method, the application procedure is as follows:

1. Basic stakeout completion; 2. Cement ring beam and safety guardrail for wellhead protection; 3. Foundation staged excavation; 4. Ring-shaped steel rib beam hoisting and steel wire mesh laying; 5. Retaining wall wall spray grouting And waiting for hardening; 6. The depth of each stage is sequentially excavated and sprayed to the bottom of the base PC pouring; 7. The base layer of the well is reinforced; 8. The well-based steel construction frame is layered and hoisted; 9. The stratified steel bars are assembled and tied; 10. The steel frame is lifted and removed in layers; 11. Concrete pouring in the well foundation; 12. Pier column steel bar binding and template concrete pouring.

(2) Steel lining method, its application conditions are more stringent, must be 1. gravel layer; 2. soil self-sustaining good stability; 3. geological hard not loose; 4. low groundwater pressure.

The steel lining method is similar to the above (1), which is briefly described as follows:

1. Basic stakeout completion; 2. Wellhead safety guardrail production; 3. Foundation staged excavation; 4. Arc-shaped steel liner hoisting assembly; 5. Vertical transverse support with H-beam hoisting; 6. Depth of stages in each stage Excavate and install the steel lining in sequence until the bottom PC is poured; 7. The base layer of the well is reinforced; 8. The lining reinforcement frame is stratified and hoisted; 9. The stratified steel bar is ligated; 10. The reinforced construction frame stratifies Lifting and removing; 11. Concrete pouring in the well foundation; 12. Pier column steel bar binding and template concrete pouring.

According to the above construction methods (1) and (2), the following disadvantages are encountered:

1. The ring beam for wellhead protection is made of reinforced concrete and is fixed for one-time pouring. After the construction is completed, it becomes waste and cannot be disassembled and moved to the next working well.

2. The steel materials for supporting H-shaped steel, steel plate, steel wire mesh or steel ring lining placed in the excavation foundation pit cannot be taken out and recycled after the cement is poured, resulting in an increase in material waste cost.

3. When the mud is sprayed on the steel mesh surface, the mud cannot be fully filled to the wall surface of the over-excavated foundation behind, and the direct contact surface between the foundation cement wall and the excavation stratum is partially hollowed, that is, the wrap area is reduced. Losing the friction that should be, relatively reduces the support that should be.

4. If the steel lining method is used, it must be applied as cement grouting behind the steel lining, filling the gap between the back of the steel lining and the excavated earth wall with cement, otherwise the peripheral surface area and wall surface of the well foundation will be lost. The frictional force even caused the horizontal displacement of the entire foundation to lose the design effect. The wage and material cost required for the back grouting occupied a high proportion of the project budget and was not effective.

5. The construction time is long. It is necessary to install the combined steel rib beam layer by layer, and then install the steel wire mesh in one piece, then spray the mud and then wait for the cement to solidify to prevent the vertical flow, and then increase the thickness strength by spraying the layer of mud. This makes it impossible to speed up the work and extend the construction period.

6. The long construction period will naturally affect the safety of the homes near the workplace and the safety of construction workers and transportation vehicles. The cost of project management will naturally increase.

The invention has to solve the problem that the outer diameter of the basic design of the well is up to several meters in diameter, and the depth must also consider the local geological drilling results, and the depth of ten meters is deep. When the construction workers and the tools are excavated deep underground, It is necessary to take into account the danger of collapse of the wall and must have a pit wall protection facility, and the actual implementation of the well foundation can only be carried out after the completion of the pit wall protection facility. Accordingly, the present invention provides a well type foundation pit wall protection device and a construction method thereof.

The advantages of the well type foundation pit wall protection device of the present invention and its construction method are as follows:

1. The top ring beam of the pit wall protection device of the present invention is modified from the conventional reinforced concrete to be bent into a steel plate, and can be reused without causing engineering waste.

2. The steel mold device of the pit wall protection device of the present invention can be reused.

3. The steel mold device of the present invention is divided into a plurality of sheet template groups, and the invention has four template groups for transportation, and can be combined into a ring shape at the site.

4. Each of the template sets of the steel mold device of the present invention may be provided with at least one connecting member between the large-area mother template and the small-area sub-template, and the sub- and mother templates respectively have a demolding slope for loosening.

5. The hoisting machine provided in the steel mold device and in which the steel mold device is synchronously retracted and moved outward can quickly and safely disassemble the four template groups of the steel mold device, thereby saving construction time and improving construction efficiency. The function.

6. The invention can solve the problem that the spray coating construction or the steel liner construction method is easy to cause the gap between the sprayed outer layer and the excavation surface, and the frictional force of the outer peripheral surface area to the lateral earth pressure is lost, and the pit wall protection of the invention The equipment does not have to wait for the cement spray hardening time as in the conventional spray method, which saves time and saves money, increases construction quality and strength, and can consistently disassemble the steel mold device.

Therefore, the well type foundation pit wall protection device of the present invention is applied to deep underground excavation, the pit wall protection device comprises a top ring beam disposed on the surface of the geological ground, and a bottom ring beam disposed below the top ring beam The steel mold device and a hoisting machine provided inside the steel mold device and for the steel mold device to simultaneously retract and move outward. The steel mold device has a plurality of sheet template groups annularly disposed under the top ring beam, each of the template groups may be provided with a child, the mother template has at least one connecting member and the child template, and the mother template has a stripping angle Degree, each sub-template is pre-screwed by a connecting piece and a drafting angle, and the lifting device is provided with a plurality of push-pull seats for the inner side of each of the corresponding template groups, and driving the push-pull seats One of the reciprocating actuators can be moved horizontally inwardly or simultaneously simultaneously, respectively.

In addition, the construction method of the pit wall protection device of the present invention is applied to underground deep excavation and geological, and includes the following steps:

a. setting a top ring beam: placing the top ring beam on a geological ground surface;

b. setting a steel mold device: the steel mold device provided with a plurality of sheet template groups is combined in a ring shape at the site and disposed under the top ring beam;

c. arranging a hoisting machine inside the steel mold device: after each of the template groups corresponding to each other can be installed in the pit wall protection cement construction of each ring, the hoisting machine is provided with a reciprocating actuating device to drive each template group Can be separately removed at the same time and moved downward toward the deep pit wall of the next ring toward the wall of the excavation hole of the well foundation; and

d. Each of the template groups moved down is sequentially pushed into a ring shape: the reciprocating actuating device of the hoisting machine drives each of the template groups to be simultaneously horizontally moved outward and then combined into a ring-shaped steel. Mold device.

1. . . Top ring beam

11. . . Rib reinforcement

12. . . Extension foot

2. . . Steel mold device

twenty one. . . Circular steel plate

211. . . Screw element

twenty two. . . Cylindrical steel ring

221. . . Rib reinforcement

twenty three. . . Template group

twenty four. . . Parent template

25. . . Subtemplate

26. . . Connector

27. . . Demoulding slope

28. . . Grouting hole

281. . . Styrofoam

3. . . Hoisting equipment

4. . . Push-pull seat

41. . . The long side

42. . . Socket

43. . . Main structural steel pipe

431. . . Fixed steel pipe

432. . . Inner sliding steel pipe

433. . . Ends

44. . . Hook

5. . . Reciprocating actuator

51. . . Screw

511. . . Positive thread

512. . . Anti-thread

52. . . Orthodontic nut

521. . . Anti-nail nut

522. . . Seat bearing

53. . . Motor reducer

6. . . Geology

61. . . Pit wall

62. . . Pit wall

3a. . . Hoisting equipment

31a. . . Main support tube

311a. . . Milling groove

32a. . . Sliding seat

33a. . . Connecting rod ear

34a. . . Screw

341a. . . Positive thread

342a. . . Anti-thread

35a. . . Orthodontic nut

351a. . . Anti-nail nut

353a. . . bolt

36a. . . Reciprocating actuator

37a. . . Steel mold hanging seat

2b. . . Steel mold device

23b. . . Template group

27b. . . Demoulding slope

271b. . . Soft cushion

h. . . height

Fig. 1 is a front view showing the underground deep excavation geological and the top ring beam of the present invention.
Fig. 2 is a front view showing the underground deep excavation geology of the present invention and the gradual movement of the top ring beam and the deeper pit wall.
Figure 3 is a perspective view of a steel mold apparatus of the present invention.
Fig. 4 is a plan view showing the combination of the steel mold device of the present invention.
Fig. 5 is a schematic view showing the interior of the hoisting machine of the present invention placed in a steel mold device.
Fig. 6 is a side view showing the inward contraction of the push-pull seat of the hoisting machine of the present invention.
Fig. 7 is a top plan view showing the opening of a sub-template of each template group of the present invention.
Fig. 8 is a top plan view showing the portion of the hoisting machine of the present invention in which the steel mold device is retracted or extrapolated.
Fig. 9 is a top plan view showing the steel mold device of the hoisting machine of the present invention.
Fig. 10 is a side elevational view showing another embodiment of the hoisting machine of the present invention.
Figure 11 is a side elevational view of the hoisting machine of Figure 10.
Figure 12: Schematic diagram of the hoisting machine of Figure 10 placed inside the steel mold device.
Figure 13 is a plan view showing another embodiment of the steel mold apparatus of the present invention.

Fig. 14 is a schematic plan view showing the entire retraction of the steel mold device of Fig. 13.
Figure 15 is a flow chart showing the steps of the construction method of the present invention.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Referring to Figures 1-9, a preferred embodiment of the pit wall protection device of the present invention is applied to underground deep excavation and geological 6 (as shown in Figures 1 and 2). The utility model comprises a top ring beam 1, a steel mold device 2 and a lifting device 3; wherein:

The top ring beam 1 is disposed on the ground surface of the geological 6 and is formed by processing a steel plate arc and assembled in four pieces. The top ring beam 1 has a circular arc shape in addition to a basic steel mold pattern. The steel is assembled and welded into the reinforcing ribs 11. The outer periphery of the reinforcing ribs 11 is further provided with a plurality of extending legs 12, and the number of the extending legs 12 can be increased or decreased according to the firmness of the construction of the geological surface 6 to increase the top ring beam. The downward support force of 1 can appropriately suspend the sliding force of the steel mold device 2 set under the cement and the watering of the cement, because the top ring beam 1 is made of steel structure, and the steel body of the well type base body can be tied and After cement grouting is completed and removed to the next well base for recycling, it can eliminate the waste of reinforced concrete and other materials by conventional methods, and can also reduce engineering waste.

The steel mold device 2 is disposed under the top ring beam 1. The steel mold device 2 is bent by a plurality of circular arc-shaped steel plates 21, and is screwed to each other by a screwing member 211 to form a cylinder having a set height h. The steel ring 22 is welded to the inner side of the cylindrical steel ring 22 by an arc-shaped steel plate or H-shaped steel to be joined to form a reinforcing rib 221 to increase the earth pressure of the steel plate 21 on the side of the excavation wall and cement pouring. When the steel plates 21 are combined and joined, they become a template group 23 of a set of steel plates; in the embodiment of the present invention, the steel mold device 2 is divided into four template groups, and each of the template groups 23 includes a mother. The template 24, a sub-template 25 having a smaller area than the mother template 24, and at least one connecting member 26 disposed between the female template 24 and the sub-template 25 for connection, the sub-template 25 is set to have the same curvature as the parent template 24 (eg, 3, 4, the connecting member 26 can be an iron hinge, and the female template 25 can be first opened by the connecting member 26 before the female template 24 is opened, and the female template 24 and the sub-template 25 are The connection between each and each of the template groups 23 is inclined at an angle such that each piece The disassembly or installation of the plate set 23 has a draft angle 27 that can be extracted, so that the disassembly or assembly of each of the formwork groups 23 is not jammed due to the draft angle 27, and the convenience of fabrication and assembly is further facilitated. The mother template 24 and the sub-template 25 of each template group 23 are made into standardized uniform size and specifications, so that the adjustment can be arbitrarily changed during assembly and construction on the site without special intentional pairing or numbering.

Moreover, the steel mold device 2 has a plurality of grouting holes 28 below, and the grouting holes 28 are arranged in a downward oblique shape on the lower side of each of the template groups 23, and the grouting holes 28 are provided with Pauli in advance. The dragon 281 is stuffed, and the hole can be reserved when the cement is poured into each of the template groups 23; and each of the template groups 23 can be removed and moved down to the lower part after the cement pouring construction of the pit wall 61 of each ring is completed. When the deeper pit wall 62 of a ring is installed, the styrofoam can be taken out from the reserved hole as the grouting hole of the next ring (as shown in Fig. 2), so that each template group 23 is sequentially arranged. Recycling, you can save the cost of materials for a set of non-recyclable H-beam ribs at a distance of one meter, and do not need the traditional cementing method to wait for the cement shot hardening time. .

The hoisting machine 3 is disposed inside the steel mold device 2 (as shown in FIG. 5), and the hoisting machine 3 is provided with a plurality of push-pull force seats 4 corresponding to the inner side of each corresponding template group 23, and respectively driving the same The push-pull force holders 4 can horizontally move one of the reciprocating actuators 5 horizontally inwardly or simultaneously, wherein each of the push-pull force seats 4 is provided with a long side 41 toward the inner side of each of the template groups 23, the long side 41 A wide to narrow receiving seat 42 is disposed at the bottom, and a main structural steel pipe 43 is respectively coupled to the bottom of the long side 41. In the embodiment of the present invention, four push-pull seats 4 are respectively screwed Fixed, making it easy to disassemble and change at the construction site; the reciprocating actuator 5 includes two sets of screws 51, positive and negative nut 52, 521 and a bearing 522 that are screwed into the receiving seat 42 of each push-pull seat 4 And the rotational power of the two sets of screws 51 is actuated by a motor reducer 53, and a sprocket 54 is driven by the motor reducer 53 to transmit a rotational torque. The motor reducer 53 and the sprocket 54 are conventional techniques. The invention will not be described in detail herein.

It is worth mentioning that, as shown in Fig. 5, the outer portion of the main structural steel pipe 43 is composed of a plurality of fixed steel pipes 431 which are assembled in parallel by two outer steel pipes, and are composed of two groups of four The outer steel pipes are combined with each other to form a cross structure at 90 degrees. The inner diameters of the four outer steel pipes are respectively provided with a slidable inner sliding steel pipe 432, and the outer sliding steel pipe 432 has an outer diameter slightly smaller than that of the fixed steel pipe 431. The four end portions 433 of the inner sliding steel pipe 432 are coupled to the push-pull force base 4, respectively.

The two ends of the two sets of screws 51 are designed as one end positive thread 511 and the other end is a reverse thread 512, so that the orthodontic nuts are respectively installed on the two ends of the positive thread 511 and the reverse thread 512. 52. When the screw 51 rotates in the forward or reverse direction, the anti-tooth nut 521 can horizontally move the four push-pull force seats 4 horizontally inward or simultaneously, and cooperate with the main structural steel pipe 43 to make four push-pull force seats. 4 balance movement, which also drives the four push-pull seat 4 connected with the orthodontic nut 52 and the anti-nut nut 521, that is, the four push-pull force seat 4 can be used because of the positive screw 511 and the anti-thread of the screw 51 The rotation of 512 is simultaneously horizontally displaced inward or outward.

Moreover, the four push-pull seats 4 are provided with a hanging member such as a hook 44 in front of the push-pull seat 44, and the hook 44 is a connecting hook on the connecting plate of each of the template groups 23, so that the lifting implement 3 can be in each of four directions. Each piece of template group 23 is hooked; when the steel mold device 2 is moved downward, as shown in Figures 6 and 7, the sub-template 25 of each template group 23 is firstly subjected to a draft angle 27, a connecting piece. 26 is pre-screwed toward the inner side of the inner template 24, and then the reciprocating actuating device 5 is respectively screwed to the socket 511 of each of the two sets of screws 51 of the push-pull seat 4 The orthodontic nut 52, the anti-nut nut 521, when the screw 51 rotates in the forward direction and synchronously shrinks each of the template groups 23 inwardly (as shown in Figs. 8 and 9), so that the circle of each of the template groups 23 is completed. The outer diameter is reduced, and the entire set of hoisting implements 3 and the entire set of reduced template groups 23 are gradually moved downwards into the wall of the wellbore of the well foundation, and the well foundation excavation, steel mold assembly, and assembly are performed one after another. The cyclic work of cement grouting, demoulding after cement consolidation, and the balance of gravity of each template group 23 itself The construction safety is strengthened.

The push-pull force base 4 and the reciprocating actuating device 5 of the hoisting machine 3 can be set as another embodiment as shown in FIGS. 10 to 12, and the hoisting machine 3a includes a main vertical support tube 31a and a plurality of The reciprocating actuating device 36a is abutted against the corresponding steel mold hanger 37a on the inner side of each of the corresponding template groups 23, and the steel mold hangers 37a are respectively driven to move horizontally inwardly or simultaneously. The upper and lower sides of the outer edge of the main support tube 31a are respectively provided with a sliding seat 32a having a plurality of connecting rod ears 33a extending radially outwardly from the connecting rods 33a. Further, the upper and lower sliding seats 32a are controlled by a set of screws 34a inside the main support tube 31a, two orthodontic nuts 35a, and an anti-nut nut 351a, and the rotational power of the set of screws 34a is the same as The motor reducer 53 shown in FIG. 5 is actuated, and a sprocket 54 is driven by a motor reducer 53 to transmit a rotational torque. The upper and lower ends of the set of screws 34a are designed as one end of a thread 341a and another. One end is a reverse thread 342a, and two orthodontic nuts 35a are mounted on both ends of the set of screws 34a. The anti-cap 351a is respectively coupled to the sliding seat 32a of the outer edge by a bolt 353a, because each of the tube walls of the main supporting tube 31a is provided with an elongated milling groove 311a for When the set screw 34a rotates in the forward or reverse direction, the two orthodontic nuts 35a, the anti-nut nut 351a and the two sliding seats 32a can be simultaneously moved outwardly toward the axial direction or vertically to the center point. The sliding seat 32a is connected to the steel mold hangers 37a by reciprocating actuators 36a, which are respectively set as a plurality of scissors-type links, and the reciprocating actuators are moved each time the upper and lower sets of sliding seats 32a move toward the center point. When the slope of 36a is decreased, that is, the relative horizontal distance is increased, the steel mold hanger seat 37a is moved outward, and when the upper and lower sets of slide seats 32a are moved to the axially outer side (upper and lower sides), the reciprocating The slope of the actuating device 36a is increased, that is, the relative horizontal distance is reduced, and the steel die attaching seat 37a is moved inwardly, that is, each of the template groups 23 hooked on the steel mold hanging seat 37a is contracted inward. The outer diameter is reduced, so that the lifting device 3 can be moved as shown in Fig. 1 above. Gradually cycle the construction under the hole in the well.

Moreover, the steel mold device 2 can be set as another embodiment as shown in FIG. 13, the steel mold device 2b is set as a four-piece template group, and each of the template groups 23b can be set to have the same area and the same curvature, and Each of the template groups 23b is connected to each other at an oblique angle of relief 27b, so that the disassembly or assembly of each of the template groups 23b is not jammed due to the draft angle 27b, and the assembly does not interfere with each other. And each of the mold release slopes 27b is provided with a soft cushion body 271b such as rubber, and each of the template groups 23b is made into a standardized uniform size and specification, so that it can be assembled at the site on site. The swapping is performed without intentional right and left pairing or numbering, which facilitates the convenience of manufacture and assembly; and the hoisting machine 3 as shown in Fig. 5 can be placed inside the steel mold device 2b or as shown in Figs. 10-12 The hoisting machine 3a uses the hoisting machine 3 or 3a to simultaneously shrink each of the template groups 23b inwardly (as shown in Fig. 14), so that the outer diameter of each of the template groups 23b is reduced, so that the entire hoisting machine 3 can be Or 3a and the entire group of reduced template groups 2 3b gradually moves downwards into the wall of the excavation hole of the well foundation, and performs cycle work such as excavation of the well foundation, assembly of the steel mold, cement grouting, demoulding after cement consolidation, and the like.

As shown in Fig. 15, it is a construction method for manufacturing a pit wall protection device as shown in Figs. 1 and 2, which comprises the following steps:

a. setting a top ring beam 1: placing the top ring beam 1 on the ground surface of the geological 6;

b. Providing a steel mold device 2: a steel mold device 2 provided with a plurality of sheet formwork groups 23, or each formwork group 23b of the steel mold device 2b as shown in Fig. 13 is set to have the same area and the same curvature, Can be combined into a ring shape at the site and placed under the top ring beam 1 (as shown in Figures 3 and 4);

c. Locating a lifting device 3 inside the steel mold device 2: each of the template groups 23 corresponding to each other can protect the cement pouring construction after the pit wall 61 of each ring is completed, and the lifting device 3 is provided with a reciprocating actuating device 5 driving each of the template groups 23 (as shown in Fig. 5), or as shown in Figs. 10 to 12, the lifting implement 3a can also drive each of the template groups 23, each of which is originally ring-shaped. The template group 23 is provided with a connecting member 26 disposed between the sub-template 25 and a female template 24, and a stripping angle 27 respectively provided. After the sub-template 25 is opened, the female template 24 is loosened respectively. Inwardly retracting, the original annular steel mold device 2 is removed (please match the figures 6 to 9), or as shown in Fig. 13, each of the template groups 23b of the steel mold device 2b is connected to each other. The draft angle 27b is such that each corresponding template group 23b is inwardly disassembled (as shown in Fig. 14) and moved downward toward the deep hole of the next ring toward the wall of the excavation hole of the well foundation. Mounted on wall 62; and

d. Each of the template groups 23 moved down is sequentially pushed out into a ring shape: each of the template groups is driven again by the reciprocating actuator 5 of the lifting implement 3 or the lifting implement 3a as shown in FIGS. 10 to 12. 23 can be horizontally moved outward simultaneously, and the sub-template 25 of each template group 23 originally unscrewed is combined with the mother template 24 to form an annular steel mold device 2, or each template as shown in FIG. The group 23b is driven by the reciprocating actuator 5 of the hoisting machine 3 or the hoisting machine 3a as shown in Figs. 10 to 12, and each of the template groups 23b is driven again to be externally pushed to form a ring-shaped steel mold device 2b, which can be followed by one ring. One ring performs the cyclic work of well foundation excavation, steel mold assembly, cement grouting, and demoulding after cement consolidation.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

1. . . Top ring beam

11. . . Rib reinforcement

12. . . Extension foot

2. . . Steel mold device

221. . . Rib reinforcement

6. . . Geology

61. . . Pit wall

62. . . Pit wall

Claims (17)

A well type foundation pit wall protection device is applied to underground deep excavation and geological, and the pit wall protection equipment comprises:
a top ring beam disposed on the surface of the geological surface;
a steel mold device, the steel mold device is disposed under the top ring beam, the steel mold device is set to a plurality of template groups of the same arc, assembled into a ring shape, and each of the template groups is respectively provided with a draft angle ;
a hoisting machine, the hoisting machine is disposed inside the steel mold device, the hoisting machine is provided with a plurality of push-pull force seats corresponding to the inner side of each of the corresponding template groups, and respectively driving the push-pull force seats respectively One of the reciprocating actuators moves horizontally inside or at the same time. The well type foundation pit wall protection device according to claim 1, wherein the steel mold device can be set as a four-piece template group, and each of the template groups is bent by a plurality of circular arc-shaped steel plates and is screwed The elements are screwed to each other to form a cylindrical steel ring of a set height, and the inner side of the cylindrical steel ring is welded and fixed by an arc-shaped steel plate or H-shaped steel to be joined to form a reinforcing rib. The well-type foundation pit wall protection device of claim 2, wherein each template group comprises a mother template, a sub-template having a smaller area than the parent template, and a template disposed between the parent template and the sub-template The connecting member is at least one connecting member of the iron hinge, and the joint between the female template and the sub-template is respectively provided with a draft angle. The well-type foundation pit wall protection device according to claim 2, wherein each of the template groups can be set to have the same area and the same arc, and each of the template groups is connected to each other with a draft angle, and A soft cushion body is respectively disposed on the inner side of each draft. The well type foundation pit wall protection device according to claim 2, wherein the steel mold device has a plurality of grouting holes under the steel mold device, and the grouting holes are arranged in a downward oblique shape on the lower side of each of the template groups. side. The well-type foundation pit wall protection device according to claim 1, wherein the lifting device can be set as four push-pull force seats, and each push-pull force seat is provided with a long side toward the inner side of each template group, the length A wide to narrow receiving seat is arranged in the bottom of the side, and a main structural steel pipe is respectively connected at the two ends of the long side of the long side. The outer part of the main structural steel pipe is provided with a plurality of fixed steel pipes, and the fixed steel pipes are composed of two The outer steel pipes are installed in parallel as a group, and two sets of four outer steel pipes are combined with each other at 90 degrees to form a cross structure. The inner diameters of the four outer steel pipes are respectively provided with an inner sliding steel pipe, and the inner sliding plates are respectively arranged. The outer diameter of the steel pipe is slightly smaller than the inner diameters of the fixed steel pipes, and the four end portions of the inner sliding steel pipes are respectively coupled to the push-pull force blocks. The well type foundation pit wall protection device according to claim 1, wherein the reciprocating actuating device comprises two sets of screw, positive and negative nut and a seat bearing screwed to each push-pull seat, and The two sets of screws are provided with a motor reducer to drive a sprocket to transmit the action. The well type foundation pit wall protection device according to claim 1, wherein the hoisting machine can be provided with a main vertical support tube and a plurality of steel dies hanging on the inner side of each corresponding template group. Hanging the seat, and respectively driving the steel mold hangers to simultaneously move one of the reciprocating actuators horizontally inwardly or simultaneously; wherein the upper and lower sides of the main support tube are respectively provided with a sliding seat The sliding seat has a plurality of connecting rod lifting lugs extending radially to the outer edge, the sliding seat being a set of screws and two orthodontic nuts inside the main supporting tube, The anti-tooth nut connection control and the set of screws are provided with a motor reducer to drive a sprocket for transmission, and one end of the upper and lower ends of the set of screws is set as a positive screw and the other end is set as a reverse thread, and The orthodontic nut of the set of screws and the anti-tooth nut are respectively screwed onto the sliding seats by a bolt, and a milling groove is respectively arranged on the bottom wall of the main supporting pipe for the group When the screw is rotating forward or reverse, the snail can be simultaneously The cap, the anti-tooth nut, and the sliding seats simultaneously move outwardly toward the axial direction or vertically to the center point, and the sliding seats are respectively coupled by the reciprocating actuators configured as a plurality of scissors-type links These steel mold hangers. The well-type foundation pit wall protection device according to claim 1, wherein the top ring beam is made of a steel plate arc and assembled into four pieces, and the outer ring beam beam is provided with a plurality of arc-shaped H-shaped steel assemblies. The plurality of reinforcing ribs are welded, and the plurality of extending legs are extended on the periphery of the reinforcing ribs. A construction method for a well type foundation pit wall protection device, which is applied to underground deep excavation and geological, and comprises the following steps;
a. setting a top ring beam: placing the top ring beam on a geological ground surface;
b. setting a steel mold device: the steel mold device provided with a plurality of sheet template groups is combined in a ring shape at the site and disposed under the top ring beam;
c. arranging a hoisting machine inside the steel mold device: after each of the template groups corresponding to each other can be installed in the pit wall protection cement construction of each ring, the hoisting machine is provided with a reciprocating actuating device to drive each template group Can be separately removed at the same time and moved downward toward the deep pit wall of the next ring toward the wall of the excavation hole of the well foundation; and
d. Each of the template groups moved down is sequentially pushed into a ring shape: the reciprocating actuating device of the hoisting machine drives each of the template groups to be simultaneously horizontally moved outward and then combined into a ring-shaped steel. Mold device. The construction method of the well type foundation pit wall protection device according to claim 10, wherein the steel mold device of the step (b) can be set as a four-piece template group, and each of the template groups is composed of a plurality of circular arc shapes. The steel plate is bent and screwed to each other to form a cylindrical steel ring of a set height. The inner side of the cylindrical steel ring is welded and fixed by an arc-shaped steel plate or H-shaped steel to be joined into a reinforcing rib. . The method for constructing a well foundation pit wall protection device according to claim 11, wherein each of the template groups of step (b) comprises a mother template, a sub-template having a smaller area than the parent template, and a The female template and the sub-template are connected for use and are at least one connecting member of the iron hinge, and the joint between the female template and the sub-template is respectively provided with a demolding slope. The method for constructing a well foundation pit wall protection device according to claim 11, wherein each of the template groups of step (b) can be set to the same area and the same arc, and each template group is connected to each other. A demolding slope is provided, and a soft cushion body is respectively disposed on the inner side of each draft. The construction method of the well type foundation pit wall protection device according to claim 10, wherein the lifting device of the step (c) can be set as four push-pull force seats, and each push-pull force seat faces each template group. The inner side is provided with a long side, a bottom of the long side is extended inwardly from a wide to narrow receiving seat, and a main structural steel pipe is respectively connected at two ends of the long side bottom, and the outer structural steel pipe is provided with a plurality of fixed steel pipes The fixed steel pipes are assembled in parallel by two outer steel pipes, and two sets of four outer steel pipes are combined with each other at 90 degrees to form a cross structure, and the inner diameters of the four outer steel pipes are respectively provided with one inner portion. The steel pipe is slid, and the outer diameter of the inner sliding steel pipe is slightly smaller than the inner diameters of the fixed steel pipes, and the ends of the inner sliding steel pipes are respectively coupled to the push-pull force blocks. The construction method of the well type foundation pit wall protection device according to claim 10, wherein the reciprocating actuating device of the step (c) comprises two sets of screws, positive and negative, which are screwed to each push-pull force seat. The nut and the seat bearing, and the two sets of screws are provided with a motor reducer to drive a sprocket to transmit the action. The construction method of the well type foundation pit wall protection device according to claim 10, wherein the lifting device of step (c) can be provided with a main vertical support tube, and a plurality of tops corresponding to each a steel mold hanging seat on the inner side of one of the formwork groups, and a reciprocating actuating device for respectively driving the steel mold hanging seats to move horizontally inward or simultaneously at the same time; wherein the outer edge of the main support tube is The lower sides are respectively provided with a sliding seat, the sliding seats have a plurality of connecting rod lifting lugs, and the connecting rod lifting lugs extend radially to the outer edge, and the sliding seats are a set of screws inside the main supporting tube And two orthodontic nuts, anti-tooth nut connection control and the set of screws are provided with a motor reducer to drive a sprocket for transmission, and one end of the upper and lower ends of the set of screws is set as a positive screw and the other end The shank nut and the anti-tooth nut of the set of screws are respectively screwed onto the sliding seats by a bolt, and the pipe wall of the main support pipe is respectively disposed above and below There is a milling groove for the group of screws to be forward or reverse rotation Simultaneously moving the orthodontic nut, the anti-tooth nut, and the sliding seats to the outer side of the axial direction or to the vertical contraction of the center point, and the sliding seats are respectively set as the plurality of scissors type links The reciprocating actuators respectively connect the steel mold hangers. The construction method of the well type foundation pit wall protection device according to claim 10, wherein the top ring beam of the step (a) is made of a steel plate arc and assembled into four pieces, and the top ring beam is peripherally disposed. A plurality of arc-shaped H-shaped steels are assembled and welded into a plurality of reinforcing ribs, and a plurality of extending legs are extended on the periphery of the reinforcing ribs.