CN113513029A - Freezing support device and construction method - Google Patents

Abstract

The invention provides a freezing support device and a construction method, wherein the freezing support device comprises enclosing plates which are arranged, connecting pieces between adjacent enclosing plates and freezing pipes which are positioned on the enclosing plates and penetrate through soil layers, the enclosing plates comprise upper hard shells and supporting parts arranged on the lower surfaces of the hard shells, grooves are arranged on the lower surfaces of the supporting parts, and the edges of the hard shells are fixedly connected with the connecting pieces. The invention considers frost heaving factors, and the supporting device cannot be greatly damaged by frost soil expansion through the internal structure of the enclosing plate.

Description

Freezing support device and construction method

Technical Field

The invention relates to the technical field of foundation pit freezing support, in particular to a freezing support device and a construction method.

Background

In recent years, with the increasingly accelerated urbanization process in China, the scale of underground engineering construction is gradually enlarged, and meanwhile, foundation pit engineering is also developed in the deep and wide aspects, and the problems that the surrounding environment of a foundation pit is increasingly complex and the environment is increasingly severely protected are also faced. Therefore, the technical challenge and the construction risk faced by the deep foundation pit supporting mode are increasingly greater, and particularly, the deep foundation pit supporting mode has the advantages that the water-rich weak stratum which is widely distributed in the eastern coastal area of China is high in natural water content of soil bodies, low in strength, poor in self-bearing capacity and high in waterproof difficulty, so that higher requirements are provided for the deep foundation pit supporting. Common deep basal pit supporting mode has drilling bored concrete pile, underground continuous wall, soil nail wall, forced type stake + jet soon water-stop curtain etc. but all has its limitation separately: for example, the cast-in-situ bored pile is easy to cause water and soil loss, high in cost and poor in water stopping performance; the underground continuous wall has good water sealing and supporting capabilities, but the manufacturing cost is too high; the soil nailing wall is only suitable for areas with low water content and good soil property; the press-in type pile and the jet grouting waterproof curtain have high requirements on construction sites and complex procedures, and cement and waterproof materials added into soil bodies have certain harm to underground water and soil.

In addition, an artificial freezing support is provided, but the influence of frost heaving factors is not considered in the existing foundation pit support specification, and the support structure and the foundation pit may deform too much according to the existing specification during construction, so that the foundation pit can be unstable in serious conditions.

Disclosure of Invention

In view of the above, the invention provides a freezing support device and a construction method thereof, which take frost heaving factors into consideration, and enable frost soil to expand through an internal structure of a coaming without causing great damage to the support device.

In order to solve the technical problem, the invention provides a freezing support device which comprises enclosing plates arranged in an array mode, connecting pieces between adjacent enclosing plates and freezing pipes which are located on the enclosing plates and penetrate through soil layers, wherein each enclosing plate comprises an upper hard shell and a supporting portion arranged on the lower surface of the hard shell, grooves are formed in the lower surface of the supporting portion, and the edge of the hard shell is fixedly connected with the connecting pieces.

Furthermore, the hard shell is rectangular, the lower surface of the hard shell is inwards recessed to form an accommodating cavity, the supporting portion is fixedly arranged in the accommodating cavity, the edge of the hard shell is outwards provided with a rectangular connecting ring, four corners of the connecting ring are provided with fixing through holes corresponding to the connecting pieces, and the hard shell and the connecting ring are integrally formed.

Furthermore, the supporting part is made of light foam concrete, and the groove is arc-shaped.

Further, the freezing pipe comprises a pipe body, a conical head located at the front end of the pipe body and a push plate located at the rear end of the pipe body, a partition plate is axially arranged inside the pipe body, a first cavity and a second cavity are respectively arranged on two sides of the partition plate, a through hole is formed in the front end of the partition plate, a first connecting pipe communicated with the first cavity and a second connecting pipe communicated with the second cavity are arranged at the position, close to the push plate, of the rear portion of the pipe body, and the first connecting pipe and the second connecting pipe are communicated with the refrigerating system.

Furthermore, a first insertion hole for allowing the freezing pipe to enter is formed in the middle of the hard shell, a second insertion hole is formed in the supporting portion corresponding to the first insertion hole, a guide sleeve is arranged on the hard shell corresponding to the first insertion hole and protrudes out of the upper surface of the hard shell, the inner diameter of the guide sleeve is matched with that of the first insertion hole, the guide sleeve and the hard shell are integrally cast, and a clearance groove for allowing the first connecting pipe and the second connecting pipe to pass through is formed in the guide sleeve.

Further, the connecting piece includes the bottom plate, the lower surface of bottom plate sets up the fixed thorn body of a plurality of, the upper surface of bottom plate is arranged and is set up four and fixed perforation complex spliced pole, the middle part of bottom plate sets up a stake foundation hole, fixed perforation cover is established on the spliced pole, pile foundation hole inserts the fastening anchor stake, the apex angle of go-between corresponds the fastening anchor stake and sets up the arc breach, the rear end of fastening anchor stake sets up the roof, the four corners of roof corresponds the spliced pole and sets up the trepanning, the roof compresses tightly fixedly to the go-between at fixed perforation place, the upper end of spliced pole corresponds the roof and sets up the retaining member.

Further, the retaining member includes the internal thread sleeve, the upper portion of spliced pole set up with internal thread sleeve complex external screw thread, the elastic gasket that bonds of internal thread sleeve lower extreme, the telescopic upper end of one of them side internal thread on every connecting piece sets up the holder of cooperation refrigerating system.

Further, refrigerating system includes the refrigerating plant main part and with the confession liquid trunk line and the liquid trunk line that returns of refrigerating plant main part intercommunication, supply the liquid trunk line through first water knockout drum and a plurality of confession liquid bleeder intercommunications, return the liquid trunk line and pass through second water knockout drum and a plurality of liquid bleeder intercommunications that return, the fixed confession liquid bleeder that supplies of holder of every connecting piece downside, the fixed liquid bleeder that returns of holder of upside, first connecting pipe is connected with the confession liquid bleeder that is located the stereoplasm casing upside, the second connecting pipe with be located stereoplasm casing downside return liquid bleeder intercommunication.

Further, the holder is including setting up the semi-annular layer board at internal thread sleeve tip, the articulated semi-annular apron that sets up of one end of semi-annular layer board, semi-annular layer board and semi-annular apron other end bolt fastening, supply liquid bleeder or return liquid bleeder and pass in the support ring that semi-annular layer board and semi-annular apron are constituteed, the internal diameter that props the ring is greater than the external diameter that supplies liquid bleeder or return liquid bleeder.

Furthermore, a temperature measuring mechanism is arranged on the hard shell and comprises a hard shell and a plurality of temperature measuring holes formed by the support part around the freezing pipe, temperature measuring rods or plugging blocks are selectively inserted into the temperature measuring holes, each temperature measuring rod comprises an inserting rod main body, an equipment cavity is formed in the hollow part of the inserting rod main body, a temperature sensor is arranged at the bottom of the equipment cavity, and the inserting rods are made of materials with good heat conductivity.

The construction method of the freezing support device comprises the following steps:

the method comprises the steps of excavating foundation pits layer by layer, after the excavation of each layer of steps is finished, firstly determining the position of a connecting piece and installing the connecting piece, fixing a surrounding plate through the connecting piece, then inserting a freezing pipe, communicating the freezing pipe with a liquid supply branched pipe and a liquid return branched pipe of the layer, starting a refrigerating device main body to freeze the soil layer, and after the freezing of the layer is finished, constructing the next layer until the construction of the foundation pit is finished.

Furthermore, during freezing operation, the refrigerating device main body adopts intermittent refrigeration liquid supply.

Furthermore, each layer of step is excavated, level the retaining surface, the position of the connecting piece is located, a soil layer fixed connecting piece is inserted through the fixed thorn body, the fixed perforation on the enclosing plate corresponds to the connecting column, so that the enclosing plate is fixed on the connecting piece, the enclosing plate is locked by smashing the fastening anchor piles, the connecting piece is further fixed, then the locking piece is sleeved on the upper end of the connecting column, the freezing pipe is inserted in the center of the enclosing plate, the locking piece rotates to a proper position, so that the clamping piece supports the liquid supply branch pipe or the liquid return branch pipe, the refrigeration system is erected, and the freezing pipe starts to freeze after being communicated with the refrigeration system.

The technical scheme of the invention has the following beneficial effects:

the bounding wall passes through the stereoplasm casing and supports the portion constitution, through the groove structure of supporting part, if take place the frost heaving scene when freezing the operation for frozen soil can expand in the recess, absorbs some inflation, and frost heaving can not cause great destruction to whole supporting device like this. Meanwhile, the supporting portion is made of light foam concrete, so that the supporting portion has larger thickness, but the weight of the supporting portion is not large due to the material problem, the structural strength is not poor, the overall strength of the coaming is not reduced, the quality of the coaming is greatly reduced, and the gravity applied to the side wall of the foundation pit is smaller.

In addition, freezing the pipe and not adopting the mode of beating the pipe from top to bottom, the frost heaving of beating the pipe from top to bottom can't absorb, and this application is through horizontal bayonet freezing pipe, like this after frozen soil forms, at first can have vertical one deck frozen layer, in addition along freezing the male direction of pipe, can appear more to the soil layer stretch out the freezing post that extends, the surface of freezing the post is irregular, can increase the frictional force of frozen layer and soil layer for frozen layer strut dynamics is bigger.

In addition, through this supporting device, belong to the bench method and excavate layer by layer during construction, install the support when excavating the one deck, until final foundation ditch construction completion, the security is higher.

Drawings

FIG. 1 is a side cross-sectional view of a freeze support apparatus of the present invention;

FIG. 2 is a schematic front view of the freeze support apparatus of the present invention;

FIG. 3 is a schematic structural view of a freezing tube according to the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 1 at A according to the present invention;

FIG. 5 is a schematic view of the structure of the clamping member of the present invention;

FIG. 6 is a schematic structural view of a temperature measuring mechanism provided on a surrounding plate according to the present invention;

FIG. 7 is a schematic view of a temperature measuring rod according to the present invention;

FIG. 8 is a schematic structural diagram of a foundation pit after a layer of coaming is installed in the invention;

FIG. 9 is a schematic structural diagram of a foundation pit after two layers of enclosing plates are installed in the invention;

FIG. 10 is a schematic structural diagram of a foundation pit after four fenders are installed in the invention;

fig. 11 is a schematic view of the structure of the refrigeration system of the present invention.

1. A connecting member; 2. enclosing plates; 3. a freezing pipe; 4. pushing the plate; 5. a guide sleeve; 6. a hard shell; 7. a support portion; 8. a connecting ring; 9. a groove; 10. a second insertion hole; 11. a clamping member; 12. a second connecting pipe; 13. a liquid return branch pipe; 14. a branch liquid supply pipe; 15. a first connecting pipe; 16. a first chamber; 17. a second chamber; 18. a partition plate; 19. a through hole; 20. a first insertion hole; 21. an internally threaded sleeve; 22. connecting columns; 23. an elastic pad; 24. a top plate; 25. trepanning; 26. fixing the through hole; 27. an arc-shaped notch; 28. a temperature sensor; 29. a base plate; 30. pile foundation holes; 31. fixing the thorn body; 32. fastening anchor piles; 33. a semi-annular cover plate; 34. a semi-annular pallet; 35. a support ring; 36. a temperature measuring rod; 37. a plugging block; 38. a temperature measuring hole; 39. an equipment chamber; 40. a plunger body; 41. a refrigeration device main body; 42. a main liquid supply pipeline; 43. a main liquid return pipeline; 44. a first water divider; 45. and a second water divider.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 11 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Example one

As shown in fig. 1-11:

the embodiment provides a freeze supporting device, including arranging connecting piece 1 between 2, the adjacent bounding wall of setting and being located the bounding wall 2 and penetrating the freezing pipe 3 of soil layer, bounding wall 2 includes the supporting part 7 that the stereoplasm casing 6 and the stereoplasm casing 6 lower surface of upper strata set up, supporting part 7 lower surface sets up recess 9, the edge and the connecting piece 1 fixed connection of stereoplasm casing 6.

The hard shell 6 is rectangular, the lower surface of the hard shell 6 is recessed inwards to form an accommodating cavity, the supporting portion 7 is fixedly arranged in the accommodating cavity, the edge of the hard shell 6 is outwards provided with a rectangular connecting ring 8, four corners of the connecting ring 8 are provided with fixing through holes 26 corresponding to the connecting pieces 1, and the hard shell 6 and the connecting ring 8 are integrally formed.

The supporting portion 7 is made of light foam concrete, and the groove 9 is arc-shaped.

Specifically, the coaming 2 is preferably square in structure, the size of the coaming is one meter to two meters, the structure formed by the accommodating cavity is rectangular, irregular bulges can be arranged on the inner side of the hard shell 6, and the combination degree is better after light foam concrete is poured. The connecting ring 8 and the hard shell 6 are integrally cast and formed, the connecting ring 8 is arranged on the outer side of the hard shell 6 and matched with the connecting piece 1, and the enclosing plate 2 is fixed on the side wall of the foundation pit. In addition, the support part 7 is made of light foam concrete, so that the heat transfer speed of the coaming 2 can be reduced while the structural strength is maintained due to weight reduction, the freezing process can be accelerated, and the freezing strength of a soil layer is higher.

According to one embodiment of the present invention, as shown in figures 1-3,

the freezing pipe 3 comprises a pipe body, a conical head located at the front end of the pipe body and a push plate 4 located at the rear end of the pipe body, a partition plate 18 is axially arranged inside the pipe body, a first cavity 16 and a second cavity 17 are respectively arranged on two sides of the partition plate 18, a through hole 19 is formed in the front end of the partition plate 18, a first connecting pipe 15 communicated with the first cavity 16 and a second connecting pipe 12 communicated with the second cavity 17 are arranged at the position, close to the push plate 4, of the rear portion of the pipe body, and the first connecting pipe 15 and the second connecting pipe 12 are communicated with a refrigerating system.

The freezing pipe 3 is internally circulated with low-temperature saline water, so that the freezing pipe 3 is internally hollow, and the front end of the freezing pipe is a conical head to conveniently break into a soil layer. The inside of the tube body is divided into a first chamber 16 and a second chamber 17 by a partition plate 18, and a through hole 19 for flowing low-temperature brine is provided at the front end of the partition plate 18. After the connecting pipe is communicated with the refrigerating system, low-temperature salt water can flow in the two cavities and is discharged, and the freezing pipe 3 is cooled, so that the soil is cooled, and the soil layer is frozen.

According to one embodiment of the present invention, as shown in figures 1 and 2,

the middle of the hard shell 6 is provided with a first insertion hole 20 for the freezing pipe 3 to enter, the supporting part 7 is provided with a second insertion hole 10 corresponding to the first insertion hole 20, the hard shell 6 is provided with a guide sleeve 5 corresponding to the first insertion hole 20, the guide sleeve 5 protrudes out of the upper surface of the hard shell 6, the inner diameter of the guide sleeve 5 is matched with the first insertion hole 20, the guide sleeve 5 and the hard shell 6 are integrally cast, and the guide sleeve is provided with a clearance groove for the first connecting pipe 15 and the second connecting pipe 12 to pass through. The hard shell 6 and the middle part of the support part 7 are provided with a first insertion hole 20 and a second insertion hole 10 in a matching way, and particularly, the second insertion hole 10 is made by placing a mold when the support part 7 is poured. The hard shell 6 is also integrally cast and formed with a guide sleeve 5 matched with the first insertion hole 20, and the freezing pipe 3 enters the coaming 2 through the guide sleeve 5 and finally enters the soil layer. The push plate 4 of freezing 3 tip of pipe is promoted by equipment and is inserted in the soil horizon, and final push plate 4 contacts with 5 tip contacts of guide sleeve, and first connecting pipe 15 and second connecting pipe 12 need enter into the dead slot of keeping away of guide sleeve 5 like this, and the structure of dead slot is exactly two simple cell bodies, and the cell body has the opening at 5 tip of guide sleeve, freezes the in-process of 3 insertitions of pipe, should keep away the dead slot and correspond with first connecting pipe 15 and second connecting pipe 12, and final two connecting pipes stretch out from the dead slot and communicate with refrigerating system.

According to one embodiment of the present invention, as shown in figures 1, 2 and 3,

connecting piece 1 includes bottom plate 29, the lower surface of bottom plate 29 sets up the fixed thorn body 31 of a plurality of, the upper surface of bottom plate 29 is arranged and is set up four and fixed perforation 26 complex spliced pole 22, the middle part of bottom plate 29 sets up stake foundation hole 30, fixed perforation 26 cover is established on spliced pole 22, insert fastening anchor pile 32 in the stake foundation hole 30, the apex angle of spliced pole 8 corresponds fastening anchor pile 32 and sets up arc breach 27, the rear end of fastening anchor pile 32 sets up roof 24, the spliced pole 22 sets up trepanning 25 is corresponding in the four corners of roof 24, roof 24 compresses tightly fixedly to the spliced pole 8 at fixed perforation 26 place, the upper end of spliced pole 22 corresponds roof 24 and sets up the retaining member.

The connecting piece 1 is responsible for assembling the bounding wall 2 and connecting and fixing at the foundation ditch lateral wall, the connecting plate includes bottom plate 29, fixed thorn body 31, wherein fixed thorn body 31 plays the effect of fore-stock, fix bottom plate 29 at the foundation ditch lateral wall through fixed thorn body 31 earlier when the installation, then install the bounding wall 2 one by one, later the pile foundation hole 30 of bottom plate 29 inserts fastening anchor pile 32 again, and press the go-between 8 at the edge of bounding wall 2 through the roof 24 of fastening anchor pile 32 tip fixedly, make go-between 8 can not drop from the spliced pole 22 of bottom plate 29. The fixing holes 26 at the four corners of the connecting ring 8 may be tapered so that the attachment of the shroud 2 to the connecting post 22 is easy in the case of errors. Because the fastening anchor pile 32 is inserted into the middle of the bottom plate 29, the arc-shaped notches 27 are formed in the four corners of the connecting ring 8 corresponding to the fastening anchor pile 32, so that the pile foundation holes 30 are prevented from being covered after the four corners of the connecting ring 8 are butted, and the fastening anchor pile 32 cannot be inserted. After the fastening anchor piles 32 are inserted, the upper ends of the connecting columns 22 are also provided with locking parts for locking the top plates 24 of the fastening anchor piles 32, so that the connecting pieces 1 form a firm whole, can not be loosened, and has better effect.

In one embodiment of the present invention, as shown in figures 1-5,

the retaining member includes internal thread sleeve 21, the upper portion of spliced pole 22 sets up and internal thread sleeve 21 complex external screw thread, internal thread sleeve 21 lower extreme bonding elasticity gasket 23, the upper end of one of them side internal thread sleeve 21 on every connecting piece 1 sets up cooperation refrigerating system's holder 11.

The clamping piece 11 comprises a semi-annular supporting plate 34 arranged at the end part of the internal thread sleeve 21, a semi-annular cover plate 33 is hinged to one end of the semi-annular supporting plate 34, the other ends of the semi-annular supporting plate 34 and the semi-annular cover plate 33 are fixed through bolts, the branch liquid supply pipe 14 or the branch liquid return pipe 13 penetrates through a support ring 35 formed by the semi-annular supporting plate 34 and the semi-annular cover plate 33, and the inner diameter of the support ring 35 is larger than the outer diameter of the branch liquid supply pipe 14 or the branch liquid return pipe 13.

The retaining member has adopted internal thread sleeve 21, sets up the external screw thread on the spliced pole 22, inserts the back at fastening anchor stake 32, twists internal thread sleeve 21 and makes internal thread sleeve 21 bottom compress tightly roof 24 and realize fixing. And the lower extreme of internal thread sleeve 21 has elastic gasket 23, and its fixed effect is better, makes things convenient for the retaining member to adjust the angle after final rotatory completion simultaneously, makes things convenient for holder 11 to keep vertical. The clamping part 11 supports the branch liquid supply pipe 14 and the branch liquid return pipe 13, the clamping part 11 comprises a semi-annular supporting plate 34 fixedly connected with the end part of the internal thread sleeve 21 and a semi-annular cover plate 33 rotatably arranged on the semi-annular supporting plate 34, and after the branch pipes are placed on the semi-annular supporting plate 34, the semi-annular cover plate 33 and the semi-annular supporting plate 34 are locked through bolts, so that the branch pipes can be well supported and fixed.

In one embodiment of the present invention, as shown in figures 2 and 11,

the refrigerating system comprises a refrigerating device main body 41, a liquid supply main pipe 42 and a liquid return main pipe 43 which are communicated with the refrigerating device main body 41, wherein the liquid supply main pipe 42 is communicated with a plurality of liquid supply branch pipes 14 through a first water divider 44, the liquid return main pipe 43 is communicated with a plurality of liquid return branch pipes 13 through a second water divider 45, the liquid supply branch pipes 14 are fixed on a clamping piece 11 on the lower side of each connecting piece 1, the liquid return branch pipes 13 are fixed on the clamping piece 11 on the upper side, a first connecting pipe 15 is connected with the liquid supply branch pipes 14 on the upper side of the hard shell 6, and the liquid return branch pipes 13 on the lower side of the hard shell 6 are communicated with a second connecting pipe 12.

The refrigeration system can adopt the existing refrigeration device, wherein the main body 41 of the refrigeration device cools the saline water, and provides power to make the low-temperature saline water enter the main liquid supply pipe 42, the main liquid supply pipe 42 sends the low-temperature saline water into each branch liquid supply pipe 14 through the first water separator 44, the low-temperature saline water enters the freezing pipe 3 and then enters the branch liquid return pipe 13, and enters the main liquid return pipe 43 through the second water separator 45, and finally enters the main body 41 of the refrigeration device, thus completing the circulation. When two water distributors are connected with the branch pipe, the connecting part needs to adopt hose transition, and the branch pipe is conveniently placed at different heights on the side wall of the foundation pit. In addition, for each layer of the coaming 2, the upper clamping piece 11 of the coaming 2 is fixed with the branch liquid supply pipe 14, and the lower clamping piece 11 is fixed with the branch liquid return pipe 13.

In one embodiment of the present invention, as shown in figures 6 and 7,

the temperature measuring device is characterized in that the hard shell 6 is provided with a temperature measuring mechanism, the temperature measuring mechanism comprises a plurality of temperature measuring holes 38 formed by surrounding the freezing pipe 3 by the hard shell 6 and a supporting part 7, a temperature measuring rod 36 or a blocking block 37 is selectively inserted into the temperature measuring holes 38, the temperature measuring rod 36 comprises an inserted rod main body 40, an equipment cavity 39 is formed in the hollow part of the inserted rod main body 40, a temperature sensor 28 is arranged at the bottom of the equipment cavity 39, and the inserted rod is made of a material with good heat conducting property. The temperature measuring mechanism can detect the freezing condition in the side wall of the foundation pit, the temperature measuring holes 38 are arranged in a plurality of layers around the center of the hard shell 6, when the detection requirement is not met, the temperature measuring holes can be plugged by the plugging blocks 37, and when the detection requirement is met, the plugging blocks 37 are taken down to insert the temperature measuring rod 36 for temperature measurement. The temperature measuring rod 36 adopts an inserted rod, the temperature sensor 28 is arranged in the hollow part of the inserted rod, the temperature sensor 28 is positioned in the deep part of the equipment cavity 39 inserted into the inserted part, and the line of the temperature sensor 28 is led out of the equipment cavity 39, so that the freezing condition in the soil layer can be detected by inserting the temperature measuring holes 38 in different directions.

In one embodiment of the present invention, as shown in figures 8-10,

the construction method of the freezing support device comprises the following steps:

the method comprises the steps of excavating foundation pits layer by layer, after excavation of each layer of steps is finished, firstly determining the position of a connecting piece 1 and installing the connecting piece, fixing a surrounding plate 2 through the connecting piece 1 and then inserting a freezing pipe 3, communicating the freezing pipe 3 with a liquid supply branch pipe 14 and a liquid return branch pipe 13 of the layer, starting a refrigerating device main body 41 to freeze the soil layer, and after freezing of the layer is finished, constructing the next layer until foundation pit construction is finished.

During freezing operation, the refrigeration device body 41 adopts intermittent refrigeration liquid supply.

Each layer of step excavates and finishes, level a plane and protect the face, positioning connection spare 1 position, insert soil layer fixed connection spare 1 through fixed thorn body 31, correspond fixed perforation 26 on bounding wall 2 with spliced pole 22, make bounding wall 2 fix on connecting piece 1, lock bounding wall 2 through pounding fastening anchor stake 32 into, and further fix connecting piece 1, then embolia the retaining member spliced pole 22 upper end, and insert at bounding wall 2 center and freeze the pipe 3, the retaining member is rotatory to suitable position, make holder 11 support confession liquid bleeder 14 or return liquid bleeder 13, erect refrigerating system, begin to freeze the operation after freezing pipe 3 and refrigerating system intercommunication.

The intermittent freezing is adopted during the freezing operation, so that the frost heaving condition can be relieved, the area of a freezing area can be increased, and the final supporting force is larger.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A freeze support device, its characterized in that: including arranging connecting piece (1) between bounding wall (2), adjacent bounding wall (2) that set up and be located bounding wall (2) and penetrate freezing pipe (3) of soil layer, bounding wall (2) include stereoplasm casing (6) on upper strata and supporting part (7) that stereoplasm casing (6) lower surface set up, supporting part (7) lower surface sets up recess (9), the edge and connecting piece (1) fixed connection of stereoplasm casing (6).

2. A freeze support apparatus as claimed in claim 1, wherein: stereoplasm casing (6) are the rectangle, the inside sunken chamber that holds that forms in stereoplasm casing (6) lower surface, supporting part (7) are fixed to be set up and are holding the intracavity, the edge of stereoplasm casing (6) outwards sets up go-between (8) of rectangle, the four corners of go-between (8) corresponds connecting piece (1) and sets up fixed perforation (26), stereoplasm casing (6) and go-between (8) integrated into one piece.

3. A freeze support apparatus as claimed in claim 2, wherein: freezing pipe (3) including the body, be located the cone of body front end and be located push pedal (4) of body rear end, the body is inside along axial setting baffle (18), baffle (18) both sides are first cavity (16) and second cavity (17) respectively, the front end of baffle (18) sets up through-hole (19), the rear portion of body is close to push pedal (4) department and sets up first connecting pipe (15) and second connecting pipe (12) with second cavity (17) intercommunication with first cavity (16) intercommunication, first connecting pipe (15) and second connecting pipe (12) and refrigerating system intercommunication.

4. A freeze support apparatus as claimed in claim 3, wherein: the middle part of stereoplasm casing (6) sets up first patchhole (20) that supply to freeze pipe (3) and get into, supporting part (7) set up second patchhole (10) corresponding first patchhole (20), it sets up guide sleeve (5) to correspond first patchhole (20) on stereoplasm casing (6), the upper surface of the stereoplasm casing (6) of protrusion of guide sleeve (5), the internal diameter and the first patchhole (20) looks adaptation of guide sleeve (5), guide sleeve (5) and stereoplasm casing (6) integrative casting, the last clearance groove that supplies first connecting pipe (15) and second connecting pipe (12) to pass that sets up of guide sleeve.

5. A freeze support apparatus as claimed in claim 4, in which: the connecting piece (1) comprises a bottom plate (29), a plurality of fixed thorn bodies (31) are arranged on the lower surface of the bottom plate (29), four connecting columns (22) matched with the fixing through holes (26) are arranged on the upper surface of the bottom plate (29), the middle part of the bottom plate (29) is provided with a pile foundation hole (30), the fixed through hole (26) is sleeved on the connecting column (22), a fastening anchor pile (32) is inserted into the pile foundation hole (30), an arc-shaped notch (27) is arranged at the vertex angle of the connecting ring (8) corresponding to the fastening anchor pile (32), a top plate (24) is arranged at the rear end of the fastening anchor pile (32), sleeve holes (25) are arranged at four corners of the top plate (24) corresponding to the connecting columns (22), the top plate (24) compresses and fixes the connecting ring (8) where the fixing through hole (26) is positioned, the upper end of the connecting column (22) is provided with a locking piece corresponding to the top plate (24).

6. A freeze support apparatus as claimed in claim 5, in which: the retaining member includes internal thread sleeve (21), the upper portion setting of spliced pole (22) and internal thread sleeve (21) complex external screw thread, the elasticity gasket (23) of internal thread sleeve (21) lower extreme bonding, the upper end of wherein one side internal thread sleeve (21) on every connecting piece (1) sets up cooperation refrigerating system's holder (11).

7. A freeze support apparatus as claimed in claim 6, in which: the refrigerating system comprises a refrigerating device main body (41), a liquid supply main pipe (42) and a liquid return main pipe (43) which are communicated with the refrigerating device main body (41), wherein the liquid supply main pipe (42) is communicated with a plurality of liquid supply branch pipes (14) through a first water separator (44), the liquid return main pipe (43) is communicated with a plurality of liquid return branch pipes (13) through a second water separator (45), the liquid supply branch pipes (14) are fixed on a clamping piece (11) on the lower side of each connecting piece (1), the liquid return branch pipes (13) are fixed on the clamping piece (11) on the upper side, a first connecting pipe (15) is connected with the liquid supply branch pipes (14) on the upper side of the hard shell (6), and a second connecting pipe (12) is communicated with the liquid return branch pipes (13) on the lower side of the hard shell (6).

8. A freeze support apparatus as claimed in claim 7, in which: the clamping part (11) comprises a semi-annular supporting plate (34) arranged at the end part of the internal thread sleeve (21), a semi-annular cover plate (33) is hinged to one end of the semi-annular supporting plate (34), the other end of the semi-annular supporting plate (34) and the other end of the semi-annular cover plate (33) are fixed through bolts, the liquid supply branch pipe (14) or the liquid return branch pipe (13) penetrates through a support ring (35) formed by the semi-annular supporting plate (34) and the semi-annular cover plate (33), and the inner diameter of the support ring (35) is larger than the outer diameter of the liquid supply branch pipe (14) or the liquid return branch pipe (13).

9. A construction method based on the freezing support device of any one of the claims 1-8, comprising the steps of:

the method comprises the steps of excavating foundation pits layer by layer, after excavation of each layer of steps is finished, firstly determining the position of a connecting piece (1) and installing the connecting piece, fixing a surrounding plate (2) through the connecting piece (1), then inserting a freezing pipe (3), communicating the freezing pipe (3) with a liquid supply branch pipe (14) and a liquid return branch pipe (13) of the layer, starting a refrigerating device main body (41) to freeze a soil layer, and after freezing of the layer is finished, constructing the next layer until construction of the foundation pit is finished.

10. A construction method of a freeze support apparatus as claimed in claim 9, wherein: every layer of step excavates and finishes, level a plane and protect the face, location connecting piece (1) position, insert soil layer fixed connection spare (1) through fixed thorn body (31), correspond fixed perforation (26) on bounding wall (2) with spliced pole (22), make bounding wall (2) fix on connecting piece (1), lock bounding wall (2) through pounding fastening anchor stake (32), and further fix connecting piece (1), then embolia spliced pole (22) upper end with the retaining member, and insert at bounding wall (2) center and freeze pipe (3), the retaining member is rotatory to suitable position, make holder (11) support confession liquid bleeder pipe (14) or return liquid bleeder pipe (13), erect refrigerating system, start freezing the operation after freezing pipe (3) and refrigerating system intercommunication.

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