CN111560963A

CN111560963A - Unilateral formwork system based on soil nail wall foundation pit

Info

Publication number: CN111560963A
Application number: CN202010357368.9A
Authority: CN
Inventors: 周洲; 孟金龙; 窦玉东; 王坤; 李鹏; 徐小帆; 杨春; 冯中贵; 符海德
Original assignee: First Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
Current assignee: First Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-21

Abstract

The invention discloses a single-side formwork system based on a soil nailing wall foundation pit, and belongs to the technical field of building construction. The invention discloses a unilateral formwork system based on a soil nailing wall foundation pit, which comprises: the template is arranged in a foundation pit on one side of the soil nailing wall; the drawknot piece comprises a first drawknot part and a second drawknot part, the first drawknot part is fastened on the soil nails and/or the wale, and the second drawknot part extends towards the direction of the template; the connecting piece penetrates through the template, one end of the connecting piece is fixedly connected with the second tie part, and the other end of the connecting piece is fixedly connected with one side of the template, which is far away from the soil nailing wall; the inclined strut is obliquely arranged on one side of the template, which is far away from the soil nail wall, and one end of the inclined strut is connected with one end of the connecting piece, which is far away from the soil nail wall, and supports the template; the supporting piece is fixedly arranged, and the supporting piece is fixedly connected with the other end of the inclined strut. The unilateral formwork supporting system based on the soil nailing wall foundation pit realizes unilateral supporting of the formwork, and meets the requirement of supporting the formwork when the distance between the side line of the foundation pit and the side line of the building is too short.

Description

Unilateral formwork system based on soil nail wall foundation pit

Technical Field

The invention relates to the technical field of buildings, in particular to a single-side formwork system based on a soil nailing wall foundation pit.

Background

The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. Before excavation, an excavation scheme is determined according to geological and hydrological data and the conditions of buildings nearby the site, and waterproof drainage work is performed. The persons with low excavation depth can use the method of putting side slope to make the earth slope stable, and the size of the slope is determined according to the relevant construction project. When a deeper foundation pit and a building adjacent to the deeper foundation pit are excavated, the outer soil is prevented from collapsing by using a foundation pit wall supporting method, a concrete-sprayed wall protecting method, a large foundation pit and even a method of interlocking an underground connecting wall and a columnar bored pile; for those who have no influence on nearby buildings, the underground water level can be reduced by a well point method, and slope releasing open cut is adopted; in cold regions, natural cold bonding methods can be used for excavation and the like.

The soil nailing wall is an in-situ soil body reinforcement technology. The side slope reinforcement type support construction method is characterized in that a foundation pit side slope is reinforced through soil nails made of reinforcing steel bars, a reinforcing mesh is laid on the surface of the side slope, and then a layer of concrete surface layer and an earthwork side slope are sprayed. The construction is a complex formed by firmly bonding a reinforced rod piece (namely a soil nail or an anchor rod) arranged in a slope body with the surrounding soil body, and a supporting structure similar to a gravity retaining wall formed by surface layers.

Processing the concrete outer wall in the soil nailing wall foundation pit, generally adopting a bilateral formwork system, namely respectively arranging formworks on two sides corresponding to the position of the formed concrete outer wall in the foundation pit, reinforcing, and pouring the formed concrete outer wall in the formworks on the two sides.

However, in recent years, various building constructions in China are very rapid, which results in that in some cities with dense population, the land area is seriously short of supply, during the building construction, many projects are located in areas with dense buildings, the side line of a foundation pit is closer to the side line of a building structure, engineering designers often do not consider construction errors during the design, and further, when the buildings are constructed in the foundation pit, the side line of the building is very close to the side line of the foundation pit, and constructors are difficult to set a template at one side close to the side line of the foundation pit for reinforcement, so that the traditional double-side formwork system cannot be used.

Disclosure of Invention

In order to solve the defects of the prior art, the embodiment of the invention provides a single-side formwork system based on a soil nailing wall foundation pit, so as to solve the problem that the side line of a building is too close to the side line of the foundation pit, so that the formwork is difficult to reinforce.

In order to achieve the above technical problem, an embodiment of the present invention provides a single-side formwork system for a foundation pit based on a soil nailing wall, where a soil nail and a wale are arranged on one side of the soil nailing wall facing the foundation pit, and the single-side formwork system includes:

the template is arranged in the foundation pit on one side of the soil nailing wall;

the drawknot piece comprises a first drawknot part and a second drawknot part, the first drawknot part is fastened on the soil nails and/or the wale, and the second drawknot part extends towards the direction of the template;

the connecting piece penetrates through the template, one end of the connecting piece is fixedly connected with the second tie part, and the other end of the connecting piece is fixedly connected with one side of the template, which is far away from the soil nailing wall;

the inclined strut is obliquely arranged on one side, away from the soil nail wall, of the template, and one end of the inclined strut is connected with one end, away from the soil nail wall, of the connecting piece and supports the template;

the supporting piece is fixedly arranged and is fixedly connected with the other end of the inclined strut.

Alternatively, if the first knot part is fastened to the soil nail, the first knot part is in surface contact with the end surface of the soil nail and is fastened by welding.

Alternatively, if the first tie part is fastened to the wale, the first tie part and the wale are coupled by an expansion bolt, one end of the expansion bolt is embedded in the wale, the other end of the expansion bolt is in surface contact with the first tie part, and the first tie part and the expansion bolt are fastened by welding.

Optionally, the connecting piece is a screw rod, one end of the connecting piece, which is far away from the soil nailing wall, extends out of the template, the screw rod is far away from the soil nailing wall and extends out of the template, a mountain-shaped clamp is arranged on the part, which is far away from the soil nailing wall, of the screw rod, a steel pipe is arranged between the mountain-shaped clamp and the template, and the mountain-shaped clamp can be screwed relatively to the screw rod, so that the steel pipe compresses the template.

Optionally, a forming space is formed between the template and the soil nailing wall and is used for casting and forming a concrete outer wall; the template includes:

the shaping template is used for determining the shape of the concrete outer wall in pouring molding;

and the reinforcing plate is arranged on one side of the sizing template, which faces the steel pipe, and is used for resisting the deformation of the template when the steel pipe extrudes the template.

Optionally, the sizing template is formed by splicing a plurality of sub-templates and a plurality of boards, wherein the boards are arranged at positions where the connecting pieces penetrate through the templates.

Optionally, the bottom of the formwork is provided with a plurality of fasteners, and the fasteners are fastened and connected with the bottom of the formwork.

Optionally, the bottom of the formwork is further provided with a lateral sealing member, and the lateral sealing member is arranged on the side face of the formwork and is fixedly connected with the formwork.

Optionally, the stiffening plate and/or the lateral seal is square steel.

Optionally, the support and/or the fastener is a rebar.

The invention has the beneficial effects that:

the embodiment of the invention provides a single-side formwork system based on a composite soil nailing wall foundation pit, which is characterized in that one side of a template, which is away from a soil nailing wall, is reinforced at one side, a region for pouring a concrete outer wall is formed between the template and the soil nailing wall, the single-side reinforcement of the template provides a pulling force for the template through a pulling piece, two ends of a connecting piece are fastened with the pulling piece and the template respectively to reinforce the template, and a supporting force is provided at one side of the template, which is away from the soil nailing wall, through an inclined strut and a supporting piece, so that the rigidity and the stability of the reinforcement of the template at one side are ensured.

Drawings

The advantages of the above and/or additional aspects of the present invention will become apparent and readily appreciated from the following description of the embodiments taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a soil nailing wall foundation pit in the embodiment of the invention;

FIG. 2 is a schematic structural diagram of a single-side formwork supporting system based on a soil nailing wall foundation pit according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a diagonal brace in an embodiment of the present invention;

FIG. 4 is a partial schematic structural view of FIG. 2 at A in one embodiment;

FIG. 5 is a partial schematic structural view of FIG. 2 at B in one embodiment;

FIG. 6 is a schematic view of the connection of a fastener to a connecting member in an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a template in an embodiment of the invention;

FIG. 8 is an elevation view of a form reinforcement in an embodiment of the present invention;

FIG. 9 is a schematic structural view of a sizing die plate in an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an application of a single-side formwork system based on a soil nailing wall foundation pit in the embodiment of the invention.

Wherein, the corresponding relations between the reference numbers and the part names in fig. 1 to 10 are as follows:

1. a template; 10. shaping the template; 11. a reinforcing plate; 12. a sub-template; 13. a template; 100. soil nailing walls; 110. soil nailing; 120. an anchor cable; 130. a wale; 2. a pulling member; 20. a first drawknot portion; 21. A second drawknot portion; 200. a foundation pit; 3. a connecting member; 30. a mountain-shaped card; 31. a steel pipe; 300. a concrete outer wall; 4. bracing; 40. a connecting end; 5. a support member; 6. an expansion bolt; 7. a fastener; 8. a lateral seal; 9. and (5) supporting a formwork of the building.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

The embodiment of the invention aims to solve the problem that a double-side formwork system based on a soil nailing wall foundation pit cannot be used due to too short distance between the side line of the foundation pit and the side line of a building. It should be noted here that the one-sided formwork system shown in the drawings and described in this specification is only one example of the wide variety of one-sided formwork systems that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the single-sided formwork system or any of the components of the single-sided formwork shown in the drawings or described in the present specification.

First, referring to fig. 1, fig. 1 shows a schematic structural diagram of a soil nailing wall foundation pit in an embodiment of the invention. Referring to fig. 1, a soil nailing wall foundation pit is a construction environment of a single-side formwork erecting system according to an embodiment of the present invention, and referring to fig. 1, the foundation pit includes a soil nailing wall 100 and a foundation pit 200 located at one side of the soil nailing wall 100, and during construction, a concrete outer wall needs to be formed in the foundation pit 200 and adjacent to a side slope of the soil nailing wall 100. The side slope of the soil nailing wall 100 is reinforced through the soil nails 110, part of the soil nails 110 are also connected with the anchor cables 120, the side slope of the soil nailing wall 100 is reinforced through the soil nailing wall 100 and the anchor cables 120, and the side slope of the soil nailing wall 100 is also sprayed with a concrete surface layer to be combined with the side slope of the soil nailing wall 100 so as to reinforce the side slope of the soil nailing wall 100. It should be noted that fig. 1 only shows the structure of the soil nailing wall foundation pit of an embodiment, and the single-side formwork system based on the soil nailing wall foundation pit of the embodiment of the invention should not be limited to the soil nailing wall foundation pit shown in fig. 1.

At present, in many projects, the distance between the side line of the foundation pit and the side line of the building structure is too short, so that a bilateral formwork supporting system cannot be used. Referring to fig. 2 and 3, in the embodiment of the present invention, a single-side formwork system for a foundation pit based on a soil nailing wall is provided, wherein a side of the soil nailing wall 100 facing the foundation pit 200 is provided with soil nails 110 and a wale 130, and the single-side formwork system includes a formwork 1, tie members 2, connecting members 3, diagonal braces 4 and supporting members 5.

The template 1 is disposed in the foundation pit 200, and the template 1 is disposed adjacent to the soil nailing wall 100. When a bilateral formwork support system is used, a pair of formworks can be arranged in the foundation pit 200, a forming space is formed between the pair of formworks, and after the pair of formworks are reinforced, a formed concrete outer wall is poured in the forming space between the pair of formworks. In the embodiment of the invention, the template 1 can be reinforced on one side, a forming space is formed between the template 1 and the soil nailing wall 100, and a concrete outer wall is poured and formed in the forming space between the template 1 and the soil nailing wall 100.

Referring to fig. 2, 4 and 5, the fastener 2 includes a first fastening portion 20 and a second fastening portion 21, the first fastening portion 20 and the second fastening portion 21 are connected to form an L-shaped structure, the first fastening portion 20 is fastened to the soil nail 110 and/or the wale 130, and the second fastening portion 21 extends toward the formwork 1. The connecting piece 3 runs through the formwork 1, one end of the connecting piece 3 is fixedly connected with the second tie part 21, and the other end of the connecting piece 3 is fixedly connected with one side of the formwork 1 departing from the soil nailing wall 100. The steel bars cannot be planted on the soil nailing wall 100 in the foundation pit engineering, so that the soil nailing wall 100 cannot be tied, and the rigidity and stability of the template cannot be guaranteed. The embodiment of the present invention utilizes the structural members in the soil nailing wall 100, such as: the soil nails 110 and the wales 130 are used as the tie points of the reinforced template 1, the tie pieces 2 are fixedly arranged on the soil nails 110 and/or the wales 130, and the tie pieces 2 and the template 1 are respectively fastened and connected through the connecting pieces 3, so that the rigidity and the stability of the template 1 are ensured.

The inclined strut 4 is arranged on one side, away from the soil nailing wall 100, of the template 1, the inclined strut 4 is obliquely arranged relative to the template 1, and one end of the inclined strut 4 is connected with one end, away from the soil nailing wall 100, of the connecting piece 3 and supports the template 1; the supporting member 5 is fixedly disposed on the inclined strut 4, and the other end of the inclined strut 4 is fastened to the supporting member 5, so as to provide a supporting force for the inclined strut 4 through the supporting member 5, thereby ensuring that the inclined strut 4 has sufficient stability to support the formwork 1.

As can be seen from the above embodiments, the single-side formwork system of the embodiment of the present invention implements single-side formwork in a manner that a bracing force is provided to the formwork 1 through the diagonal braces 4, the formwork 1 is fastened through the connecting members 3, the connecting members 3 are fastened to the soil nails 110 and/or wales 130 on the soil nail wall through the tie members 2, and tie points are provided by the soil nails 110 and/or wales 130 on the soil nail wall.

In the embodiment of the present invention, as shown in fig. 4, if the first tie part 20 is fastened to the soil nail 110, the first tie part 20 is in surface contact with the end surface of the soil nail 110 to increase the contact surface contact therebetween, thereby improving the fastening property of the connection therebetween, alternatively, the soil nail 110 may be a steel flower tube, the outer surface of the first tie part 20 is attached to the end surface of the soil nail 110, the first tie part 20 is welded to the end surface of the soil nail 110, and the welding mode may be full welding. In a specific implementation, in order to further improve the fastening force between the first tie portion 20 and the end surface of the soil nail 110, the end surface of the soil nail 110 is polished in advance to make the end surface of the soil nail 110 smoother, and when the end surface of the soil nail 110 is polished, the end surface of the soil nail 110 may be polished at a certain inclination angle, for example, when there is a certain inclination angle between the connector 3 and the second tie portion 21, in order to make the contact area between the connector 3 and the second tie portion 21 larger, the angle of the second tie portion 21 may be adjusted by adjusting the angle of the first tie portion 20, and further, the relative angle between the second tie portion 21 and the connector 3 may be adjusted.

In an alternative embodiment, as shown in fig. 5, if the first coupling portion 20 is fastened to the wale 130, the first coupling portion 20 and the wale 130 are coupled by the expansion bolt 6, wherein one end of the expansion bolt 6 is embedded in the wale 130, the other end is in surface contact with the first coupling portion 20, and the first coupling portion 20 and the expansion bolt 6 are fastened by welding. Before welding, the end face of the expansion bolt 6 can be polished in advance to enable the contact surface to be smoother and improve the connection tightness; in addition, according to the relative inclination angle between the connecting member 3 and the second coupling portion 21, the expansion bolt 6 may be adjusted to adapt to the relative inclination angle between the connecting member 3 and the second coupling portion 21, and in this embodiment, the angle at which the expansion bolt 6 is embedded in the wale 130 may be selected to be adjusted.

The second connecting portion 21 is connected to the first connecting portion 20, and the second connecting portion 21 extends toward the formwork 1, so that the connecting member 3 is connected to the second connecting member 21. The connecting member 3 and the second bonding portion 21 may be connected by welding, preferably, the connecting member 3 and the second bonding portion 21 are fully welded, when the connecting member 3 and the second bonding portion 21 are fully welded, there is a problem of ensuring a contact area between the connecting member 3 and the second bonding portion 21, and to solve the problem, the above-described adjustment of the inclination angle between the first bonding portion 20 and the soil nail 110 and/or the expansion bolt 6 may be adopted to adjust the inclination angle of the second bonding portion 21 relative to the connecting member 3, so as to ensure that the contact area between the connecting member 3 and the second bonding portion 21 is as large as possible, and of course, the height of the second bonding portion 21 may also be adjusted, so as to achieve the purpose of adjusting the contact area between the second bonding portion 21 and the connecting member 3. In the embodiment of the present invention, the tie member 2 may be selected as an angle steel, and two free ends of the angle steel are respectively used as the first tie portion 20 and the second tie portion 21, but of course, other components similar to the angle steel may also be used, for example, two steel plates are connected to each other to form an L-shaped structure, at this time, an included angle between the two steel plates may be adjusted according to a relative inclination angle between the second tie portion 21 and the connecting member 3, and a position of a connection position between the two steel plates may also be adjusted. Referring to fig. 6, which shows a schematic structural view of the connection of the fastener member and the connecting member, in the illustrated embodiment, the portion of the connecting member 3 connected to the second fastener member 21 is disposed in parallel on the second fastener member 21, and the connecting member 3 is fastened to the second fastener member 21 by welding.

Referring to fig. 2 and 7, the connecting member 3 may be a screw, one end of the screw, which is far away from the soil nailing wall 100, extends out of the formwork 1, a mountain-shaped clip 30 is disposed on a portion of the screw, which is far away from the soil nailing wall 100 and extends out of the formwork 1, and a steel pipe 31 is disposed between the mountain-shaped clip 30 and the formwork 1. The chevron-shaped clamp 30 is in threaded connection with the screw, when the chevron-shaped clamp 30 is screwed tightly relative to the screw, the chevron-shaped clamp 30 drives the steel pipe 31 to move towards the formwork 1, and when the steel pipe 31 abuts against the formwork 1, the chevron-shaped clamp 30 is screwed continuously, so that the steel pipe 31 provides acting force towards the direction of the soil nailing wall 100 for the formwork 1. In this embodiment, the connecting member 3 is used for reinforcing the formwork by matching with the tie member 2, and when the connecting member 3 is a screw rod, the fastening of one end of the connecting member 3 far away from the soil nailing wall 100 is realized through the structures of the mountain-shaped clamp 30 and the steel pipe 31, and the screwing or unscrewing of the mountain-shaped clamp 30 can be used for finely adjusting the distance between the formwork 1 and the soil nailing wall 100, so as to achieve the purpose of finely adjusting the thickness of the poured concrete outer wall.

In an alternative embodiment, the connection 3 may alternatively be a water screw. The difference between the water stop screw and the common wall-penetrating screw is that the water stop sheet is arranged in the middle of the water stop screw, the water stop sheet is arranged between the template 1 and the soil nail wall 100, after the concrete outer wall 300 is poured, the water stop sheet is positioned in the concrete outer wall 300 to play a role in water prevention, in addition, when the template is removed, the water stop screw is used for sawing off two ends positioned outside the concrete outer wall 300 and leaving the middle section in the concrete outer wall 300 so as to ensure the watertightness of the wall body, and the common wall-penetrating screw generally takes out the whole screw from the wall body and can influence the watertightness of the wall body.

The inclined strut 4 can be selected as a steel bar, a steel pipe and other components, the support member 5 can be selected as a steel bar, wherein the support member 5 is preferably waste steel bars in engineering materials, the support member 5 is vertically fixed on the ground, the floor and other planes, for example, in the embodiment shown in the attached drawings of the invention, the building in the foundation pit has two layers, the support member 5 can be respectively fixed in the ground at the bottom layer or on the floor at the upper layer, and two ends of the inclined strut 4 are respectively connected with the support member 5 and the connecting member 3 so as to achieve the effect of providing the support force for the template 1. In the embodiment of the present invention, referring to fig. 2 and 3, two ends of the inclined strut 4 are respectively connected with a connecting end 40 forming a U-shaped structure, the U-shaped structure of the connecting end 40 is sleeved on the steel tube 31 at one end of the inclined strut 4 facing the template 1, the U-shaped structure of the connecting end 40 is sleeved on the supporting member 5 at one end of the inclined strut 4 facing the supporting member 5, wherein the steel tube 31 is arranged along the horizontal direction, the supporting member 5 is arranged along the vertical direction, and the connecting ends 40 at two ends of the inclined strut 4 are respectively staggered by 90 degrees to respectively sleeve the steel tube 31 and the supporting member 5, at this time, a single connecting end 40 can rotate relative to the steel tube 31 or the supporting member 5, but the rotating directions of the two are not consistent, and after being integrated together, the inclined strut 4 cannot rotate integrally, thereby ensuring that the. In an alternative embodiment, a pair of steel pipes 31 is disposed between the chevron-shaped clamp 30 and the formwork 1, and at this time, the U-shaped structure of the connecting end 40 of the brace 4 facing one end of the formwork 1 is sleeved on the pair of steel pipes 31. The connecting end 40 and the inclined strut can be selected to be threaded connection, for example, the inclined strut 4 is selected to be a steel pipe, the connecting ends 40 at the two ends of the inclined strut 4 extend into the steel pipe 4, an internal thread is arranged in the steel pipe 4, an external thread matched with the internal thread is arranged outside the connecting end 40, the steel pipe 4 and the connecting end 40 are connected through the threads, the connecting structure facilitates the later-stage detachment of the inclined strut 4 and the connecting end 40, of course, the skilled person can adopt other connecting modes within the scope of the common knowledge of the skilled person, for example, the inclined strut 4 and the connecting end 40 are welded and fastened with each other.

After the construction of the single-side formwork system based on the soil nailing wall foundation pit is completed, the processing of the concrete outer wall 300 in the foundation pit can be started, and the concrete outer wall 300 is formed by pouring. In the embodiment of the invention, the template 1 adopts a single-side support, a forming space is formed between the template 1 and the soil nailing wall 100 and is used for pouring concrete to form a concrete outer wall, and the thickness of the concrete outer wall 300 is determined by the distance between the template 1 and the soil nailing wall 100. The shape of the concrete outer wall 300 is determined by the shape of the molding space, for example, when the concrete outer wall 300 is molded, the concrete is poured into the molding space between the template 1 and the soil nailing wall 100, the profile of the molded concrete outer wall 300 is determined according to the template 1 and the soil nailing wall 100, specifically, one side of the template 1 facing the soil nailing wall 100 determines one side of the concrete outer wall 300, and one side of the soil nailing wall 100 facing the foundation pit 200 determines the other side of the concrete outer wall 300. When the concrete outer wall 300 is poured, the formwork 1 is provided with sufficient firmness and stability by the single-side formwork system.

In an alternative embodiment, as shown in fig. 7 and 8, the form 1 includes a sizing form 10 and a reinforcing plate 11. The setting template 10 is located at a side close to the soil nailing wall 100, and the reinforcing plate 11 is located between the setting template 10 and the steel pipe 31, wherein the setting template 10 is used for determining the shape of the concrete outer wall 300, and the reinforcing plate 11 is used for maintaining the shape of the setting template 10 when the steel pipe 31 presses the setting template 10. Of course, in order to maintain the shape of the concrete exterior wall 300 and to resist the deformation caused by the extrusion of the steel pipes 31, the form 1 may be a one-piece steel plate, but the area of the steel plate required in this way is too large, which may greatly increase the construction cost, and the transportation and operation of the steel plate having a large area are also troublesome. In this embodiment, design template 10 can select for timber, it has with low costs, processing is convenient, the convenient characteristics of transportation, can the field machining obtain even when the area demand is big, reinforcing plate 11 can select for steel, however, in this embodiment, reinforcing plate 11 can select for a plurality of steel, for example, the square steel, connect a plurality of mountain type cards 30 and steel pipe 31 respectively, effectual demand that reduces steel like this, to whole template 1, steel pipe or billet through a plurality of even settings respectively with corresponding mountain type card 30, steel pipe 31, 3 cooperations of connecting piece can, can effectively reduce the degree of difficulty and the cost of processing.

Referring to fig. 9, the design template 10 may be formed by splicing a plurality of sub-templates 12, wherein the sub-templates 12 may be obtained by customization, and the whole template 1 may be formed by quickly splicing the sub-templates 12 by increasing the number of the sub-templates 12 according to the area of the whole template 1, which may greatly improve the manufacturing efficiency of the template 1.

According to the embodiment of the invention, the connecting pieces 3 of the single-side formwork supporting system based on the soil nailing wall foundation pit of the embodiment of the invention penetrate through the formwork 1, and the scheme of mutually splicing the plurality of sub-formworks 12 to form the shaping formwork 10 is adopted, so that the connecting pieces 3 can not be used for punching some sub-formworks 12, and when too many holes are formed in the sub-formworks 12 or the positions of the holes are exactly consistent with the positions needing punching in the next use in the turnover process, the holes can not be used, so that the turnover capacity of the sub-formworks 12 is low, and even the sub-formworks 12 need to be separately preset every time when the requirement is strict. To solve this problem, with continued reference to fig. 9, in the embodiment of the present invention, the sizing die plate 10 may be selected by splicing a plurality of sub-die plates 12 and a plurality of wood plates 13, wherein the positions of the wood plates 13 are set at the positions where the connecting members 3 pass through the die plate 1. As shown in fig. 9, the wood board 13 has a small area, and can be processed by using the wood beam left or discarded in the field construction process, and can be processed and manufactured in each construction, and the wood board 13 is used as a medium for the connection member 3 to pass through, so that the sub-template 12 avoids perforation, and the sub-template 12 can be recycled for multiple times.

When the concrete outer wall 300 is cast and formed, the slurry cast does not leak in the construction process, and in practical application, the bottom of the template 1 is a reinforced weak point, and the slurry leaks easily, so that protection needs to be added to the bottom of the template 1 to ensure the forming quality of the concrete outer wall 300. In the embodiment of the invention, referring to fig. 8, a plurality of fasteners 7 are arranged at the bottom of a formwork 1, one ends of the fasteners 7 are fastened under the ground of a foundation pit 200, and the other ends of the fasteners 7 are embedded into the formwork 1, so that the purpose of fastening the formwork 1 and the bottom surface of the foundation pit 200 together is achieved, when the formwork 1 is installed, the bottom of the formwork 1 and the ground of the foundation pit 200 are smoothly attached, then the formwork 1 and the ground of the foundation pit 200 are fastened together through the fasteners 7, and subsequently, when a concrete outer wall 300 is cast, the bottom of the formwork 1 has enough stability so as to prevent slurry from leaking from the bottom of the formwork 1. In the embodiment of the present invention, the fastener 7 may be selected as a remaining tendon head at a construction site to effectively use waste during construction, reduce construction cost, and increase economic efficiency, and optionally, the thickness of the remaining tendon head is not less than 14 mm.

To further increase the closure of the bottom of the formwork 1 and to avoid leakage of slurry from the bottom of the formwork 1, a lateral seal 8 may optionally be provided at the bottom of the formwork 1, on the side remote from the soil nailing wall 100. The bottom surface of the lateral sealing member 8 is smoothly attached to the ground of the foundation pit 200, or alternatively, the lateral sealing member 8 is partially embedded into the ground of the foundation pit 200, and the lateral sealing member 8 is further attached to the bottom of the formwork 1 and is fastened to the bottom of the formwork 1. In the embodiment of the invention, the fastener 7 and the lateral sealing element 8 can be used independently to effectively improve the sealing property of the bottom of the template 1 and avoid slurry leakage, but the fastener 7 and the lateral sealing element can also be used in combination, so that the sealing property of the bottom of the template 1 is greatly improved. In this embodiment, the lateral seal 8 is preferably square steel, although other metal materials may be used, square steel being sufficiently strong and relatively cost effective compared to some materials commonly used in the art.

The single-side formwork system based on the soil nailing wall foundation pit in the embodiment of the invention has the following advantages that as can be seen from the description of the invention:

1. the template adopts a single-side reinforcing structure, can be used in the occasions with short distance between the side line of the foundation pit and the side line of the building, and overcomes the defect that the traditional double-side formwork supporting technology cannot be applied;

2. the self-supporting structure of the foundation pit is used as a pulling point of the single-side formwork system, for example, soil nails and/or waist beams on one side of a soil nail wall are used as the pulling points of the single-side formwork system, so that the stability of the single-side formwork system is improved;

3. the inclined strut is used as a support of the template, and the connecting piece is used for reinforcing the template, so that the stability of the template on one side is ensured;

4. the connecting piece can adopt a screw rod, and the fine adjustment of the distance between the template and the soil nail wall is realized through the structure of the mountain-shaped clamp and the steel pipe, so that the fine adjustment of the thickness of the formed concrete outer wall is realized;

5. the bottom of the template is provided with a fastener and a lateral sealing element, the weakest bottom of the template is enough to ensure that the bottom of the template has enough sealing performance, and the leakage of slurry from the bottom of the template is avoided when a concrete outer wall is poured.

As shown in fig. 10, before or after the concrete outer wall 300 is formed, a building support may be constructed in the pit 200 for processing the interior of the building, and as shown, there are two layers in the pit 200, for which purpose, the diagonal braces 4 and the supporting members 5 are respectively provided at the two layers, and the ground of each layer serves as a fixing surface for the diagonal braces 4 and the supporting members 5.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a unilateral formwork system based on soil nail wall foundation ditch, soil nail wall orientation one side of foundation ditch is equipped with soil nail and waist rail, its characterized in that, unilateral formwork system includes:

2. The unilateral formwork system according to claim 1, wherein if the first tie part is fastened to the soil nail, the first tie part is in surface-to-surface contact with an end surface of the soil nail and is fastened by welding.

3. The formwork system according to claim 1, wherein if the first tie portion is fastened to the wale, the first tie portion and the wale are coupled by an expansion bolt, one end of the expansion bolt is embedded in the wale, the other end of the expansion bolt is in surface contact with the first tie portion, and the first tie portion and the expansion bolt are fastened by welding.

4. The single-side formwork system according to claim 2 or 3, wherein the connecting member is a screw rod, one end of the connecting member, which is far away from the soil nailing wall, extends out of the formwork, a mountain-shaped clamp is arranged on a part of the screw rod, which is far away from the soil nailing wall and extends out of the formwork, a steel pipe is arranged between the mountain-shaped clamp and the formwork, and the mountain-shaped clamp can be screwed relative to the screw rod so that the steel pipe can press the formwork.

5. The single-side formwork system according to claim 4, wherein a forming space is formed between the formwork and the soil nailing wall for casting and forming a concrete outer wall; the template includes:

6. The single-sided formwork system of claim 5, wherein the form-setting formwork is formed by splicing a plurality of sub-formworks and a plurality of wood boards, wherein the wood boards are arranged at positions where the connecting pieces penetrate through the formworks.

7. The single-sided formwork system of claim 5, wherein the bottom of the formwork is provided with a plurality of fasteners, and the plurality of fasteners are fastened to the bottom of the formwork.

8. The single-sided formwork system of claim 7, wherein the bottom of the formwork is further provided with lateral seals disposed on the sides of the formwork and in secure connection therewith.

9. The single-sided formwork system of claim 8, wherein the reinforcing plate and/or the lateral seal is square steel.

10. The single-sided formwork system according to claim 7, wherein the support member and/or the fastener is a rebar.